WO2005112702A2 - Actively securable base for a modular child restraint system - Google Patents

Actively securable base for a modular child restraint system Download PDF

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Publication number
WO2005112702A2
WO2005112702A2 PCT/US2005/017992 US2005017992W WO2005112702A2 WO 2005112702 A2 WO2005112702 A2 WO 2005112702A2 US 2005017992 W US2005017992 W US 2005017992W WO 2005112702 A2 WO2005112702 A2 WO 2005112702A2
Authority
WO
WIPO (PCT)
Prior art keywords
base
vehicle
seat
platform
restraint
Prior art date
Application number
PCT/US2005/017992
Other languages
French (fr)
Other versions
WO2005112702A3 (en
Inventor
Joseph Hei
Bryan White
Original Assignee
Orbit Baby, Inc.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Orbit Baby, Inc. filed Critical Orbit Baby, Inc.
Priority to ES05753700.3T priority Critical patent/ES2496542T3/en
Priority to EP05753700.3A priority patent/EP1761143B1/en
Publication of WO2005112702A2 publication Critical patent/WO2005112702A2/en
Publication of WO2005112702A3 publication Critical patent/WO2005112702A3/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2857—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle characterised by the peculiar orientation of the child
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2803—Adaptations for seat belts
    • B60N2/2806—Adaptations for seat belts for securing the child seat to the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2821—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle having a seat and a base part
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2842—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle adapted to carry the child, when dismounted from the vehicle
    • B60N2/2845—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle adapted to carry the child, when dismounted from the vehicle having handles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2842—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle adapted to carry the child, when dismounted from the vehicle
    • B60N2/2848—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle adapted to carry the child, when dismounted from the vehicle being convertible or adaptable to a preambulator, e.g. a baby-carriage or a push-chair
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2869—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle rotatable about a vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2875—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle inclinable, as a whole or partially
    • B60N2/2878—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle inclinable, as a whole or partially the back-rest being inclinable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60N—SEATS SPECIALLY ADAPTED FOR VEHICLES; VEHICLE PASSENGER ACCOMMODATION NOT OTHERWISE PROVIDED FOR
    • B60N2/00—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles
    • B60N2/24—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles
    • B60N2/26—Seats specially adapted for vehicles; Arrangement or mounting of seats in vehicles for particular purposes or particular vehicles for children
    • B60N2/28—Seats readily mountable on, and dismountable from, existing seats or other parts of the vehicle
    • B60N2/2887—Fixation to a transversal anchorage bar, e.g. isofix

Definitions

  • the present invention relates generally to the field of transportation safety and more particularly to child carriers for use in vehicles.
  • the present invention provides a child restraint system for use in vehicles such as automobiles.
  • the system comprises a seat portion and a base.
  • the base and the seat portion are detachable. In some other embodiments the two are integrally joined.
  • the base of the invention secures the child restraint system to a vehicle seat with a vehicle restraint such as a seat belt or a LATCH system (Lower Anchors and Tethers for CHildren).
  • the base comprises means for engaging the vehicle restraint and force- multiplying means for tensioning the vehicle restraint. Tensioning the vehicle restraint secures the base by forcing the base against the vehicle seat.
  • the vehicle restraint can be, for example, a seat belt attached to the vehicle seat, or a LATCH system comprising a LATCH anchor attached to the vehicle seat and a LATCH tether attached to the base.
  • the means for engaging the vehicle restraint can include a clasp, or similar fastening device, for receiving the seat belt.
  • the means for engaging the vehicle restraint can include clips that attach the LATCH tethers to their respective anchors.
  • the force- multiplying means for tensioning the vehicle restraint can be any device, be it mechanical, pneumatic, hydraulic, or otherwise, that provides a mechanical advantage when tensioning the vehicle restraint. Mechanical examples employ screws, levers, worm-gears, or ratchet and pawl assemblies, for instance.
  • An exemplary embodiment of the base comprises a platform configured to rest on the vehicle seat, an upright member joined to the platform, and a tensioning device including a force-multiplying mechanism for tensioning the vehicle restraint.
  • PA3123US 3 member is oriented so as to substantially contact the back rest of the vehicle seat. As the vehicle restraint is tensioned the upright member is forced against the seat back while the platform is forced down into the seat pan.
  • the base can further include a foot, that in some embodiments is configured to extend between back and seat cushions of the vehicle seat.
  • the platform and upright member are either integrally joined, pivotally attached, or hingedly attached. Accordingly, in some embodiments the tensioning device drives the upright member relative to the platform. In some of the embodiments where the upright member and platform are in some way movably attached, the upright member can be conveniently folded down over the platform when not in use.
  • the tensioning device can include, for example, a lead screw, a worm-gear, or a ratchet and pawl to provide a mechanical advantage. The mechanical advantage allows a user, or another source of power such as an electric motor, to impart a substantial tension to the vehicle restraint.
  • the tensioning device includes a torque limiter to prevent over-tensioning and potential damage to the vehicle seat or base.
  • FIG. 1 is a schematic representation of an exemplary base, according to an embodiment of the present invention, secured to a vehicle seat and viewed from a side perspective.
  • FIGs. 2 and 3 show a schematic representation of an exemplary base, according to another embodiment of the present invention, in two alternative positions.
  • FIG. 4 is a side view of an exemplary base, according to yet another embodiment of the present invention.
  • FIG. 5 is a side view of an exemplary modular child restraint system according to an embodiment of the invention.
  • FIG. 6 is a side view of a schematic representation of still another exemplary base, according to an embodiment of the present invention.
  • FIG. 7 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
  • FIG. 8 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
  • FIG. 9 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
  • FIG. 10 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
  • FIG. 11 is a bottom perspective view of yet another exemplary base, according to an embodiment of the present invention.
  • FIG. 12 is a cross-section of a base, according to another embodiment of the invention, comprising a tensioning device that employs a worm-gear.
  • FIG. 13 is a cross-section of a base, according to still another embodiment of the invention, comprising a tensioning device that employs a ratchet and pawl.
  • FIG. 14 is a perspective view of a base, according to yet another embodiment of the invention, comprising a screw-type tensioning device.
  • FIG. 15 is a perspective view of a base, according to yet another embodiment of the invention, comprising a screw-type tensioning mechanism.
  • FIG. 16 is an exploded view of a torque control knob according to an embodiment of the invention.
  • FIGs. 17 and 18 show perspective views of a foldable base according to an embodiment of the invention in two different positions.
  • FIG. 19 is a side view of a tensioning device of another foldable base according to an embodiment of the invention.
  • the present invention provides child restraint systems for use in vehicles such as automobiles, aircraft, boats, buses, and so forth.
  • the restraint system comprises a seat portion and a base.
  • the seat portion holds the child and is typically provided with a restraint mechanism such as a harness.
  • the base serves as the primary interface between the seat portion and the vehicle and is designed to be left attached thereto.
  • the base advantageously provides greater child security, ease of use, and ease of installation and removal.
  • the restraint system can be modular or integral. In modular versions the seat portion is detachable from the base while in integral versions the two are permanently joined.
  • One advantage of the modular design is that the same base can be used to support seat portions that are adapted for different stages of childhood such as for infants, toddlers, and older children. Thus, as a child grows, only the seat portion needs to be upgraded.
  • the base includes a tensioning device for adjusting the tension of a vehicle restraint being used to restrain the base to a vehicle seat.
  • the vehicle restraint is a child car seat LATCH system (Lower Anchors and Tethers for CHildren)
  • the mechanism tensions the tethers of the system.
  • the vehicle restraint is a seat belt
  • the mechanism braces against the inside of the seat belt to increase the tension in the seat belt.
  • the user attaches the seat belt loosely around the base and then "expands" the base against the seat belt to achieve the desired snugness. The more the vehicle restraint is tensioned, the greater the base is forced against the vehicle seat.
  • PA3123US [030]
  • the base comprises two hinged members and a tensioning device that drives the two members relative to one another around the hinge
  • the tensioning device includes a force-multiplying device to provide a mechanical advantage so that a small force applied by the user is converted into substantially greater tension in the vehicle restraint.
  • the embodiments described below employ mechanical devices such as screws and levers in the force-multiplying device, it will be appreciated that other devices operating on other principles will also work.
  • the present invention can be implemented hydraulically or pneumatically, for example.
  • FIG. 1 schematically illustrates an exemplary embodiment of a base 100 of the present invention.
  • the base 100 comprises a generally flat upright member 105 and a platform 110 including a horizontal segment 115 and a vertical segment 120.
  • the vertical segment 120 of the platform 110 is pivotally connected to the upright member 105 at a pivot point 125.
  • the upright member 105 includes a top portion 130 and a lower portion 135 separated by the pivot point 125.
  • a tensioning device (not shown) is used to drive the upright member 105 relative to the platform 110 around the pivot point 125.
  • Upright member 105 is driven one way, as shown, to secure base 100 into a vehicle seat 140, or driven the opposite direction to remove the base 100.
  • FIGs. 2 and 3 schematically illustrate another exemplary embodiment of a base 200 of the present invention.
  • the base 200 comprises an upright member 210 and a platform 220 including a horizontal segment 230 and a vertical segment 240.
  • the vertical segment 240 of the platform 220 engages the upright member 210 at a first slidable engagement mechanism 250
  • the horizontal segment 230 engages the upright member 210 at a second slidable engagement mechanism 260.
  • each slidable engagement mechanism 250, 260. comprises a pin 270 attached to the upright member 210 that is constrained to move within a groove 280 defined into the platform 220. It will be appreciated that the pins 270 could alternately be attached to the platform 220 and the grooves 280 defined in the upright member 210.
  • other slidable engagement mechanisms can be readily substituted for the pin- in-groove mechanism that is illustrated.
  • a tensioning device (not shown) is used to drive the upright member 210 relative to the platform 220. Driven one way, the base 200 is secured into a vehicle seat, or driven the opposite away to remove the base 200. As suggested by the arrows in FIG. 3, the tensioning device forces the platform 220 to press against the seat pan and the upright member 210 to push against the vehicle seat back and seatbelt just as base 100 in FIG. 1.
  • FIG. 4 shows a side view of a base 400, embodying the principle of operation illustrated in FIGs. 2 and 3, and posed in a similar state as base 200 in FIG. 3.
  • Base 400 includes an upright member 410 and a platform 420 that can be driven relative to one another by a tensioning device 430, described in more detail below.
  • the base 400 includes a foot 440 pivotally attached to the upright member 410 and slidably attached to the platform 420 so that the foot 440 extends downward as the tensioning device 430 tightens the base 400 into a vehicle seat.
  • the foot 440 can wedge into the vehicle seat, sometimes extending between back and seat cushions, for greater stability and security.
  • an exemplary modular child restraint system 500 comprises a base 510 coupled to a detachable seat portion 520 by an engagement mechanism (not shown).
  • the base 400 of FIG. 4 illustrates one possible configuration for engaging a detachable seat portion (not shown).
  • the seat portion engages a locking ring 450 disposed on a top side of the platform 420. Further details relating to suitable base-to-seat portion engagement mechanisms can be found in U.S. Application No.
  • FIG. 5 also illustrates an integral child restraint system in which the base 510 and the seat portion 520 are permanently joined, obviating the need for the engagement mechanism.
  • a base 600 comprises an upright member 610 and a platform 620 integrally joined to form a single
  • PA3123US 10 essentially L-shaped member.
  • a tensioning device includes a belt tensioner 630 that is slidably engaged with the platform 620 and drivable forward and back by a drive mechanism 640.
  • a seat belt (not shown) loops through a securing means, such as a clasp 650, on the belt tensioner 630. Because the tension applied to the seat belt is applied in a direction that is neither purely vertical nor horizontal, the resulting force that presses the base 600 into the vehicle seat has both vertical and horizontal components, as shown.
  • this component is not strictly essential to the invention. For example, if upright member 610 were removed, the back side of the platform 620 would still engage the seat back of the vehicle seat. Such a base would be lighter and more compact.
  • FIGs. 7-10 illustrate different exemplary means for engaging a vehicle restraint.
  • the vehicle restraint comprises two permanently attached clips 1010 at the ends of respective tethers 1020 that secure the upright member to two LATCH anchors 1030 attached to the vehicle seat.
  • Other embodiments of the invention employ adjustable clasps, or similar means for securing the vehicle restraint to the base.
  • the means for engaging a vehicle restraint can simply be a molded recess with a width sufficient to receive a seat belt.
  • FIG. 10 also illustrates an exemplary embodiment of a screw-type tensioning device 1040. Although the tensioning device 1040 is shown in conjunction with a base similar to the embodiment of FIG. 1, it will be readily apparent that the tensioning device
  • PA3123US 11 1040 can be used with other embodiments.
  • a lead screw 1050 actuates a movable upright member 1060 through a nut assembly 1070 when a knob 1080 is turned.
  • the mechanism 1040 allows for force multiplication, in other words, for the use of some mechanical advantage so that a small force applied by the user is converted into substantially greater tension in the vehicle restraint.
  • the lead screw 1050 provides the mechanical advantage so that the relatively low force repeatedly applied by the user to turn the knob 1080 cumulatively translates into a much greater tension in the tethers 1020 of the vehicle restraint.
  • FIG. 11 shows a bottom perspective view of another screw -type tensioning mechanism, similar to the one shown in FIG.
  • FIGs. 12-15 show additional tensioning device embodiments.
  • FIG. 12 shows a cross-section of a base comprising a tensioning device that employs a worm-gear.
  • turning a knob 1210 turns a worm 1220 which engages a worm wheel 1230 to move an upright member 1240 around a pivot 1250.
  • FIG. 13 shows a cross-section of another base comprising a tensioning device that employs a ratchet and pawl.
  • FIGs. 14 and 15 show still other embodiments that employ screw-type tensioning devices.
  • tensioning devices described herein are intended to be actuated by hand, in some embodiments an electric motor can be used to actuate these tensioning devices.
  • an electric motor can be used to actuate these tensioning devices.
  • pneumatic systems which can be either hand-pumped, motor-driven, or operated off of a compressed air source.
  • FIG. 16 shows an exploded view of an exemplary torque control knob that can be used with any of the tensioning devices described herein.
  • the torque control knob limits the amount of force applied by the tensioning device to prevent over-tensioning that can potentially damage the vehicle seat, the vehicle restraint, and the base of the invention.
  • the torque control knob in FIG. 16 is designed to limit the torque in both turning directions, limiting the force applied to the vehicle seat in one direction, and limiting the force applied to the base itself in the other. It will be appreciated that the torque control knob of FIG. 16 is an example of a mechanical torque limiter, and that other types of torque limiters can also be used.
  • a torque limiter including an electronic strain sensor configured to sense the strain in the lead screw can be set to lock the knob or cause the knob to disengage from the lead screw above a strain threshold.
  • Some embodiments of the present invention provide a base that is foldable such that the upright member can be folded down over the platform. Making the base foldable in this way makes the base easier to carry and store.
  • FIGs. 17 and 18 show an exemplary base with the upright member in two different positions, almost completely in the upright position in FIG. 17, and almost completely in the folded position in FIG. 18.
  • FIG. 19 shows an exemplary tensioning mechanism that allows a base to fold as shown in FIGs. 17 and 18. In FIG. 19 an upright member 1900 is in the fully closed position. The tensioning mechanism in FIG.
  • the 19 comprises a back-drivable lead screw 1910, a ball nut 1920, and a clutch 1930.
  • the ball nut 1920 allows the base to fold, and the clutch 1930 prevents the base from accidentally folding when installed and in use.
  • the clutch 1930 also allows the upright member 1900 to be rapidly raised to the open position from the closed position without having to turn the lead screw 1900.

Abstract

A child restraint system for use in vehicles comprises a seat portion and a base. The base secures the child restraint system to a vehicle seat with a vehicle restraint such as a seat belt or a LATCH system. The base both engages the vehicle restraint and includes a force-multiplying mechanism for tensioning the vehicle restraint. Tensioning the vehicle restraint secures the base by forcing the base against the vehicle seat. An embodiment of the base includes a platform configured to rest on the vehicle seat, an upright member joined to the platform, and a tensioning device, including a force-multiplying mechanism, for tensioning the vehicle restraint.

Description

Actively Securable Base for a Modular Child Restraint System
CROSS-REFERENCE TO RELATED APPLICATIONS
[Oil This application claims the benefit of U.S. Provisional Application No. 60/571,791 filed on May 17, 2004 and titled "Child Car Seat with Improvements," and U.S. Provisional Application Nos. 60/610,774, 60/610,686, 60/611,177, and 60/610,800 each filed on September 17, 2004 and titled, respectively, "Modular Child Restraint System that Involves Rotation and Removal," "Actively Securing Child Restraint Base Interface that Amplifies User Leverage," "Modular Upgradeable Child Restraint System," and "Child Vehicle Restraints;" all five applications are incorporated herein by reference. This application is related to U.S. Application No. titled "Modular Child Restraint System" (Attorney Docket No. PA3124US) and U.S.
Application No. titled "Improvements for Child Restraint
Systems" (Attorney Docket No. PA3125US), both filed on even date herewith and incorporated herein by reference.
BACKGROUND OF THE INVENTION Field of the Invention
[02] The present invention relates generally to the field of transportation safety and more particularly to child carriers for use in vehicles.
PA3123US Description of the Prior Art
[03] Children's car seats have made automobile travel substantially safer for children, however, as most parents are aware, properly installing such seats is typically difficult and sometimes frustrating. Commonly, installing such seats requires the use of cumbersome seat belt clips, the need to feed the seat belt through narrow spaces, and the need to pull as hard as possible on the end of the seat belt while putting one's full weight into the child's seat. Thus, children's car seats are often improperly installed because adults do not understand how to properly install the car seat, will not take the time to perform the installation correctly, or are physically unable to produce the necessary leverage required to sufficiently tighten the seat belt that secures the child's seat. [04] Therefore, what is needed is a child's car seat that installs quickly, easily, and securely.
PA3123US SUMMARY
[05] The present invention provides a child restraint system for use in vehicles such as automobiles. The system comprises a seat portion and a base. In modular embodiments of the system, the base and the seat portion are detachable. In some other embodiments the two are integrally joined.
[06] The base of the invention secures the child restraint system to a vehicle seat with a vehicle restraint such as a seat belt or a LATCH system (Lower Anchors and Tethers for CHildren). The base comprises means for engaging the vehicle restraint and force- multiplying means for tensioning the vehicle restraint. Tensioning the vehicle restraint secures the base by forcing the base against the vehicle seat.
[07] The vehicle restraint can be, for example, a seat belt attached to the vehicle seat, or a LATCH system comprising a LATCH anchor attached to the vehicle seat and a LATCH tether attached to the base. In the case of the seat belt, the means for engaging the vehicle restraint can include a clasp, or similar fastening device, for receiving the seat belt. In the case of the LATCH system, the means for engaging the vehicle restraint can include clips that attach the LATCH tethers to their respective anchors. The force- multiplying means for tensioning the vehicle restraint can be any device, be it mechanical, pneumatic, hydraulic, or otherwise, that provides a mechanical advantage when tensioning the vehicle restraint. Mechanical examples employ screws, levers, worm-gears, or ratchet and pawl assemblies, for instance.
[08] An exemplary embodiment of the base comprises a platform configured to rest on the vehicle seat, an upright member joined to the platform, and a tensioning device including a force-multiplying mechanism for tensioning the vehicle restraint. The upright
PA3123US 3 member is oriented so as to substantially contact the back rest of the vehicle seat. As the vehicle restraint is tensioned the upright member is forced against the seat back while the platform is forced down into the seat pan. The base can further include a foot, that in some embodiments is configured to extend between back and seat cushions of the vehicle seat.
[09] In various embodiments the platform and upright member are either integrally joined, pivotally attached, or hingedly attached. Accordingly, in some embodiments the tensioning device drives the upright member relative to the platform. In some of the embodiments where the upright member and platform are in some way movably attached, the upright member can be conveniently folded down over the platform when not in use. [010] The tensioning device can include, for example, a lead screw, a worm-gear, or a ratchet and pawl to provide a mechanical advantage. The mechanical advantage allows a user, or another source of power such as an electric motor, to impart a substantial tension to the vehicle restraint. Thus, in some embodiments the tensioning device includes a torque limiter to prevent over-tensioning and potential damage to the vehicle seat or base.
PA3123US BRIEF DESCRIPTION OF DRAWINGS
[Oil] FIG. 1 is a schematic representation of an exemplary base, according to an embodiment of the present invention, secured to a vehicle seat and viewed from a side perspective.
[012] FIGs. 2 and 3 show a schematic representation of an exemplary base, according to another embodiment of the present invention, in two alternative positions.
[013] FIG. 4 is a side view of an exemplary base, according to yet another embodiment of the present invention.
[014] FIG. 5 is a side view of an exemplary modular child restraint system according to an embodiment of the invention.
[015] FIG. 6 is a side view of a schematic representation of still another exemplary base, according to an embodiment of the present invention.
[016] FIG. 7 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
[017] FIG. 8 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
[018] FIG. 9 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
[019] FIG. 10 is a perspective view of yet another exemplary base, according to an embodiment of the present invention.
[020] FIG. 11 is a bottom perspective view of yet another exemplary base, according to an embodiment of the present invention.
PA3123US [021] FIG. 12 is a cross-section of a base, according to another embodiment of the invention, comprising a tensioning device that employs a worm-gear.
[022] FIG. 13 is a cross-section of a base, according to still another embodiment of the invention, comprising a tensioning device that employs a ratchet and pawl.
[023] FIG. 14 is a perspective view of a base, according to yet another embodiment of the invention, comprising a screw-type tensioning device.
[024] FIG. 15 is a perspective view of a base, according to yet another embodiment of the invention, comprising a screw-type tensioning mechanism.
[025] FIG. 16 is an exploded view of a torque control knob according to an embodiment of the invention.
[026] FIGs. 17 and 18 show perspective views of a foldable base according to an embodiment of the invention in two different positions.
[027] FIG. 19 is a side view of a tensioning device of another foldable base according to an embodiment of the invention.
PA3123US DETAILED DESCRIPTION OF THE INVENTION
[028] The present invention provides child restraint systems for use in vehicles such as automobiles, aircraft, boats, buses, and so forth. The restraint system comprises a seat portion and a base. The seat portion holds the child and is typically provided with a restraint mechanism such as a harness. The base serves as the primary interface between the seat portion and the vehicle and is designed to be left attached thereto. The base advantageously provides greater child security, ease of use, and ease of installation and removal. The restraint system can be modular or integral. In modular versions the seat portion is detachable from the base while in integral versions the two are permanently joined. One advantage of the modular design is that the same base can be used to support seat portions that are adapted for different stages of childhood such as for infants, toddlers, and older children. Thus, as a child grows, only the seat portion needs to be upgraded.
[029] The base includes a tensioning device for adjusting the tension of a vehicle restraint being used to restrain the base to a vehicle seat. Where the vehicle restraint is a child car seat LATCH system (Lower Anchors and Tethers for CHildren), the mechanism tensions the tethers of the system. Where the vehicle restraint is a seat belt, the mechanism braces against the inside of the seat belt to increase the tension in the seat belt. Thus, rather than cinch the seat belt by pulling on the end of the belt, as in the prior art, the user attaches the seat belt loosely around the base and then "expands" the base against the seat belt to achieve the desired snugness. The more the vehicle restraint is tensioned, the greater the base is forced against the vehicle seat.
PA3123US [030] In the following embodiments, two variations are illustrated, one in which the base comprises two hinged members and a tensioning device that drives the two members relative to one another around the hinge, and another variation in which the two members are integral. In either case, the tensioning device includes a force-multiplying device to provide a mechanical advantage so that a small force applied by the user is converted into substantially greater tension in the vehicle restraint. While the embodiments described below employ mechanical devices such as screws and levers in the force-multiplying device, it will be appreciated that other devices operating on other principles will also work. Thus, the present invention can be implemented hydraulically or pneumatically, for example.
[031] . FIG. 1 schematically illustrates an exemplary embodiment of a base 100 of the present invention. The base 100 comprises a generally flat upright member 105 and a platform 110 including a horizontal segment 115 and a vertical segment 120. The vertical segment 120 of the platform 110 is pivotally connected to the upright member 105 at a pivot point 125. The upright member 105 includes a top portion 130 and a lower portion 135 separated by the pivot point 125. A tensioning device (not shown) is used to drive the upright member 105 relative to the platform 110 around the pivot point 125. Upright member 105 is driven one way, as shown, to secure base 100 into a vehicle seat 140, or driven the opposite direction to remove the base 100.
[032] From FIG. 1 it can be seen that tightening the base 100 forces the top portion 130 of the upright member 105 against the back 145 of the vehicle seat 140, while the lower portion 135 of the upright member 105 pushes against a seatbelt 150 to secure the base 100. Additionally, the platform 110 presses into the seat pan 155 of the vehicle seat 140.
PA3123US 8 As can be seen in FIG. 1, tightening the tensioning device secures the base 100 by simultaneously wedging the base 100 into the vehicle seat 140 and tightening the base 100 against the seatbelt 150. Various tensioning devices for tightening the base 100 are described in more detail, below.
[033] FIGs. 2 and 3 schematically illustrate another exemplary embodiment of a base 200 of the present invention. The base 200 comprises an upright member 210 and a platform 220 including a horizontal segment 230 and a vertical segment 240. The vertical segment 240 of the platform 220 engages the upright member 210 at a first slidable engagement mechanism 250, and the horizontal segment 230 engages the upright member 210 at a second slidable engagement mechanism 260. In the exemplary embodiment, each slidable engagement mechanism 250, 260. comprises a pin 270 attached to the upright member 210 that is constrained to move within a groove 280 defined into the platform 220. It will be appreciated that the pins 270 could alternately be attached to the platform 220 and the grooves 280 defined in the upright member 210. Likewise, other slidable engagement mechanisms can be readily substituted for the pin- in-groove mechanism that is illustrated.
[034] Just as in the embodiment illustrated in FIG. 1, a tensioning device (not shown) is used to drive the upright member 210 relative to the platform 220. Driven one way, the base 200 is secured into a vehicle seat, or driven the opposite away to remove the base 200. As suggested by the arrows in FIG. 3, the tensioning device forces the platform 220 to press against the seat pan and the upright member 210 to push against the vehicle seat back and seatbelt just as base 100 in FIG. 1.
PA3123US [035] FIG. 4 shows a side view of a base 400, embodying the principle of operation illustrated in FIGs. 2 and 3, and posed in a similar state as base 200 in FIG. 3. Base 400 includes an upright member 410 and a platform 420 that can be driven relative to one another by a tensioning device 430, described in more detail below. Also, the base 400 includes a foot 440 pivotally attached to the upright member 410 and slidably attached to the platform 420 so that the foot 440 extends downward as the tensioning device 430 tightens the base 400 into a vehicle seat. The foot 440 can wedge into the vehicle seat, sometimes extending between back and seat cushions, for greater stability and security. [036] While it will be appreciated that the base of the present invention can be part of an integral child restraint, the present invention is particularly valuable as a modular component of a modular child restraint system such as the one shown in FIG. 5. In FIG. 5, an exemplary modular child restraint system 500 comprises a base 510 coupled to a detachable seat portion 520 by an engagement mechanism (not shown). The base 400 of FIG. 4 illustrates one possible configuration for engaging a detachable seat portion (not shown). In this embodiment the seat portion engages a locking ring 450 disposed on a top side of the platform 420. Further details relating to suitable base-to-seat portion engagement mechanisms can be found in U.S. Application No. titled "Modular Child Restraint System" (Attorney Docket No. PA3124US). It will be appreciated that FIG. 5 also illustrates an integral child restraint system in which the base 510 and the seat portion 520 are permanently joined, obviating the need for the engagement mechanism.
[037] Another exemplary embodiment of the invention is shown in FIG. 6. A base 600 comprises an upright member 610 and a platform 620 integrally joined to form a single
PA3123US 10 essentially L-shaped member. A tensioning device includes a belt tensioner 630 that is slidably engaged with the platform 620 and drivable forward and back by a drive mechanism 640. A seat belt (not shown) loops through a securing means, such as a clasp 650, on the belt tensioner 630. Because the tension applied to the seat belt is applied in a direction that is neither purely vertical nor horizontal, the resulting force that presses the base 600 into the vehicle seat has both vertical and horizontal components, as shown. [038] It should be noted that although the embodiments described herein include an upright member such as upright member 610, this component is not strictly essential to the invention. For example, if upright member 610 were removed, the back side of the platform 620 would still engage the seat back of the vehicle seat. Such a base would be lighter and more compact.
[039] FIGs. 7-10 illustrate different exemplary means for engaging a vehicle restraint. In each of the embodiments shown in FIGs. 7-9 two clasps, in different arrangements, are used to attach a seat belt to the upright member of the base. In the embodiment of FIG. 10, the vehicle restraint comprises two permanently attached clips 1010 at the ends of respective tethers 1020 that secure the upright member to two LATCH anchors 1030 attached to the vehicle seat. Other embodiments of the invention employ adjustable clasps, or similar means for securing the vehicle restraint to the base. In some embodiments, in place of the clasps shown in FIGs. 6-9, the means for engaging a vehicle restraint can simply be a molded recess with a width sufficient to receive a seat belt. [040] FIG. 10 also illustrates an exemplary embodiment of a screw-type tensioning device 1040. Although the tensioning device 1040 is shown in conjunction with a base similar to the embodiment of FIG. 1, it will be readily apparent that the tensioning device
PA3123US 11 1040 can be used with other embodiments. In this embodiment a lead screw 1050 actuates a movable upright member 1060 through a nut assembly 1070 when a knob 1080 is turned. The mechanism 1040 allows for force multiplication, in other words, for the use of some mechanical advantage so that a small force applied by the user is converted into substantially greater tension in the vehicle restraint. For example, in the embodiment of FIG. 10 the lead screw 1050 provides the mechanical advantage so that the relatively low force repeatedly applied by the user to turn the knob 1080 cumulatively translates into a much greater tension in the tethers 1020 of the vehicle restraint. FIG. 11 shows a bottom perspective view of another screw -type tensioning mechanism, similar to the one shown in FIG. 10, as applied to a base such as those shown in FIGs. 2-4. [041] FIGs. 12-15 show additional tensioning device embodiments. FIG. 12 shows a cross-section of a base comprising a tensioning device that employs a worm-gear. Here, turning a knob 1210 turns a worm 1220 which engages a worm wheel 1230 to move an upright member 1240 around a pivot 1250. One advantage of using a worm gear system is that worm gear trains are non-back driving and therefore they lock automatically. [042] FIG. 13 shows a cross-section of another base comprising a tensioning device that employs a ratchet and pawl. FIGs. 14 and 15 show still other embodiments that employ screw-type tensioning devices. It will be appreciated that although the various tensioning devices described herein are intended to be actuated by hand, in some embodiments an electric motor can be used to actuate these tensioning devices. The same is true for other types of mechanisms, such as pneumatic systems, which can be either hand-pumped, motor-driven, or operated off of a compressed air source.
PA3123US 12 [043] FIG. 16 shows an exploded view of an exemplary torque control knob that can be used with any of the tensioning devices described herein. The torque control knob limits the amount of force applied by the tensioning device to prevent over-tensioning that can potentially damage the vehicle seat, the vehicle restraint, and the base of the invention. The torque control knob in FIG. 16 is designed to limit the torque in both turning directions, limiting the force applied to the vehicle seat in one direction, and limiting the force applied to the base itself in the other. It will be appreciated that the torque control knob of FIG. 16 is an example of a mechanical torque limiter, and that other types of torque limiters can also be used. For example, a torque limiter including an electronic strain sensor configured to sense the strain in the lead screw can be set to lock the knob or cause the knob to disengage from the lead screw above a strain threshold. [044] Some embodiments of the present invention provide a base that is foldable such that the upright member can be folded down over the platform. Making the base foldable in this way makes the base easier to carry and store. FIGs. 17 and 18 show an exemplary base with the upright member in two different positions, almost completely in the upright position in FIG. 17, and almost completely in the folded position in FIG. 18. [045] FIG. 19 shows an exemplary tensioning mechanism that allows a base to fold as shown in FIGs. 17 and 18. In FIG. 19 an upright member 1900 is in the fully closed position. The tensioning mechanism in FIG. 19 comprises a back-drivable lead screw 1910, a ball nut 1920, and a clutch 1930. The ball nut 1920 allows the base to fold, and the clutch 1930 prevents the base from accidentally folding when installed and in use. The clutch 1930 also allows the upright member 1900 to be rapidly raised to the open position from the closed position without having to turn the lead screw 1900.
PA3123US 13 [046] In the foregoing specification, the invention is described with reference to specific embodiments thereof, but those skilled in the art will recognize that the invention is not limited thereto. Various features and aspects of the above-described invention may be used individually or jointly. Further, the invention can be utilized in any number of environments and applications beyond those described herein without departing from the broader spirit and scope of the specification. The specification and drawings are, accordingly, to be regarded as illustrative rather than restrictive. It will be recognized that the terms "comprising," "including," and "having," as used herein, are specifically intended to be read as open-ended terms of art.
PA3123US 14

Claims

CLAIMSWhat is claimed is:
1. A base for securing a child restraint system to a vehicle seat with a vehicle restraint, the base comprising: a platform configured to rest on the vehicle seat; means for engaging the vehicle restraint to the platform; and force-multiplying means for tensioning the vehicle restraint.
2. The base of claim 1 wherein the vehicle restraint is a seat belt attached to the vehicle seat.
3. The base of claim 2 wherein the means for engaging the vehicle restraint include a clasp for receiving the seat belt.
4. The base of claim 1 wherein the vehicle restraint is a system comprising a anchor attached to the vehicle seat and a tether attached to the base.
PA3123US 15
5. A base for securing a child restraint system to a vehicle seat with a vehicle restraint, the base comprising: a platform configured to rest on the vehicle seat; an upright member joined to the platform; and a tensioning device including a force-multiplying mechanism for tensioning the vehicle restraint.
6. The base of claim 5 wherein the platform and the upright member are integrally joined.
7. The base of claim 5 wherein the platform and the upright member are pivotally attached.
8. The base of claim 5 wherein the platform and the upright member are hingedly attached.
9. The base of claim 5 further comprising an engagement mechanism for receiving a detachable seat portion of the child restraint system.
10. The base of claim 5 wherein the platform engages the vehicle restraint.
11. The base of claim 5 wherein the upright member engages the vehicle restraint.
PA3123US 16
12. The base of claim 5 wherein the tensioning device drives the upright member relative to the platform.
13. The base of claim 5 wherein the tensioning device includes a lead screw.
14. The base of claim 5 wherein the tensioning device includes a torque limiter.
15. The base of claim 5 wherein the tensioning device includes a worm-gear.
16. The base of claim 5 wherein the tensioning device includes a ratchet and pawl.
17. The base of claim 5 further comprising an extendable foot.
18. The base of claim 17 wherein the foot is configured to extend between back and seat cushions of the vehicle seat.
19. The base of claim 5 wherein the upright member is configured to be folded down over the platform.
20. The base of claim 19 wherein the tensioning mechanism includes a clutch.
PA3123US 17
21. A child restraint system comprising: a seat portion; and a base for securing the seat portion to a vehicle seat with a vehicle restraint, the base including a platform configured to rest on the vehicle seat; an upright member joined to the platform; and a tensioning device having a force-multiplying mechanism for tensioning the vehicle restraint.
22. The child restraint system of claim 21 wherein the seat portion and the base are detachable.
23. The child restraint system of claim 21 wherein the seat portion and the base are integral.
PA3123US 18
PCT/US2005/017992 2004-05-17 2005-05-17 Actively securable base for a modular child restraint system WO2005112702A2 (en)

Priority Applications (2)

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ES05753700.3T ES2496542T3 (en) 2004-05-17 2005-05-17 Active fixing base for a modular child restraint system
EP05753700.3A EP1761143B1 (en) 2004-05-17 2005-05-17 Actively securable base for a modular child restraint system

Applications Claiming Priority (10)

Application Number Priority Date Filing Date Title
US57179104P 2004-05-17 2004-05-17
US60/571,791 2004-05-17
US61077404P 2004-09-17 2004-09-17
US61080004P 2004-09-17 2004-09-17
US61117704P 2004-09-17 2004-09-17
US61068604P 2004-09-17 2004-09-17
US60/610,686 2004-09-17
US60/610,774 2004-09-17
US60/611,177 2004-09-17
US60/610,800 2004-09-17

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PCT/US2005/017409 WO2005112701A2 (en) 2004-05-17 2005-05-17 Modular child restraint system
PCT/US2005/017992 WO2005112702A2 (en) 2004-05-17 2005-05-17 Actively securable base for a modular child restraint system

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US20050264064A1 (en) 2005-12-01
US20100148553A1 (en) 2010-06-17
US20110115264A1 (en) 2011-05-19
US20050253431A1 (en) 2005-11-17
US8256841B2 (en) 2012-09-04
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US8182033B2 (en) 2012-05-22
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US20120267925A1 (en) 2012-10-25
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US7338122B2 (en) 2008-03-04
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US20100314925A1 (en) 2010-12-16
US8511749B2 (en) 2013-08-20
US20080042476A1 (en) 2008-02-21
WO2005112702A3 (en) 2007-01-11
US7740313B1 (en) 2010-06-22
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ES2595454T3 (en) 2016-12-30
US7887129B2 (en) 2011-02-15

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