US 20070057548 A1
An adjustable lumbar support mechanism located in a seat back of a vehicle seat for supporting the lower back of a seat occupant. The lumbar support mechanism generally includes a lumbar support member supported on a frame within the seat back. The support member includes a sheet or panel formed of a resilient material. The panel including a plurality of openings located therein. A rib extending on the rear surface of the panel helps to control and provide rigidity to the support member. A seat occupant utilizes an actuator, coupled by an adjustment cable to the support member, to adjust the curvature and thereby vary support provided by the lumbar support mechanism.
24. A support member for use with a seat comprising:
a flexible member having an upper end, a lower end, first and second sides, a front surface and a rear surface;
a rib located on and protruding outward from said rear surface, said rib positioned between and spaced from said first and second sides of said flexible member and located on a line extending between said upper and lower ends.
25. A support member as set forth in
26. A support member as set forth in
27. A support member as set forth in
28. A support member as set forth in
29. A support member as set forth in
30. A support member as set forth in
31. A support member as set forth in
32. A support member as set forth in
33. A support member as set forth in
34. A support member as set forth in
35. A support member for use with a seat comprising:
a flexible member having an upper end, a lower end, first and second sides, a front surface and a rear surface;
a plurality of ribs located on said flexible member and extending outward from said rear surface, at least one of said ribs having a configuration that varies along the longitudinal length of said rib, said ribs spaced from said first and second sides; and
a plurality of openings in said flexible member, said openings extending between said front surface and said rear surface of said flexible member.
36. A support member as set forth in
37. A support member as set forth in
38. A support member as set forth in
39. A support member as set forth in
40. A support member for use with a seat comprising:
a flexible member having an upper end, a lower end, first and second sides, a front surface and a rear surface; and
means for controlling the flexibility of said flexible member, said means including at least one rib extending outward from said rear surface and spaced from said first and second sides.
41. A support member as set forth in
42. A support member as set forth in
1. Field of the Invention
The present invention pertains to a lumbar support for use with a seat; more particularly, to an adjustable lumbar support used in a vehicle seat.
2. Description of Related Art
Automobile manufacturers, in a continued attempt to provide comfort to vehicle occupants, now provide adjustable vehicle seats that enable an operator or seat occupant to increase comfort and accessibility to vehicle controls by varying the seat position. One of the many features now included in an automotive seat is an adjustable lumbar support located in the seat back. The lumbar support supports the lumbar region of a seat occupant's back.
The design of lumbar support mechanisms installed in vehicles seats has changed over time. Many of these mechanisms are complex and require a multitude of components. Such mechanisms often include a flexible support member formed of a plurality of resilient axial members with a multitude of transverse members connected thereto. The flexible support member is mounted in the seat back. An actuator mounted in the vehicle such that it is accessible to the seat occupant is connected to the flexible support member and operates to flex or bend the flexible support member to adjust its shape or curvature. Accordingly, the seat occupant adjusts the shape or curvature of the flexible support member to achieve the desired level of lumbar support.
As with many mechanical devices, more parts typically results in a more complex device that usually costs more to manufacture and is often more difficult to assemble and install. In addition, as the number of parts or complexity of a device increases the possibility that the device may ultimately break or fail usually increases. Increased occurrences of failure results not only in consumer dissatisfaction, they also increase overall costs resulting from repair or warranty concerns.
Accordingly, it is desirable to have a cost-efficient, simple and durable lumbar support mechanism that is easily installed in a vehicle seat utilizing an actuator assembly that easily adjust the position of the lumbar support member to provide support to the lumbar region of a seat occupants back.
The present invention is a lumbar support mechanism for use with a seat. The mechanism includes a support member including a panel having an upper and lower end and a rear surface. A rib located on the rear surface projects outward from the rear surface of the panel. The rib is located on a line extending between the upper end and lower end of the panel. The support member is mounted to a guide structure. The guide structure includes upright leg members. An actuator is connected or coupled to the support member through an adjustment cable wherein one end of the cable is connected to the actuator and the other end of the cable is connected to the support member. Accordingly, the actuator operates to position the support member in a multitude of positions to vary the degree or amount of support provided to the seat occupant.
Further areas of applicability of the present invention will become apparent from the detailed description provided hereinafter. It should be understood that the detailed description and specific examples, while indicating the preferred embodiment of the invention, are intended for purposes of illustration only and are not intended to limit the scope of the invention.
The present invention will become more fully understood from the detailed description and the accompanying drawings, wherein:
The following description of the preferred embodiment(s) is merely exemplary in nature and, thus, variations that do not depart from the gist of the invention are intended to be within the scope of the invention. Such variations are not to be regarded as a departure from the spirit and scope of the invention.
The lumbar support mechanism 10 generally includes a lumbar support member 30. The lumbar support member 30 is supported in the seat back 16 by the upper 24 and lower 26 cross bars of the seat frame 18. The lumbar support member 30 positions or moves the lower seating surface 20 of the seat back 16 to provide support to the lumbar region of a seat occupant. Secured to the seat bolster 14 is an actuator 32. The actuator 32 acts through an adjustment cable 34 to position the lumbar support member 30. The seat occupant uses the actuator 32 to vary the position of the lumbar support member 30 and consequently vary the amount of lumbar support provided at the lower seating surface 20.
As shown in
The panel 36 includes a plurality of openings 38 located therein. The openings 38 remove a portion of the material of the panel 36 giving the panel 36 a web-type configuration or shape. The openings 38 help to reduce the rigidity of the panel 36 and to control the flexibility and bending stresses occurring in the panel 36 during use of the lumbar support member 30. Accordingly, the openings 38 may vary in shape, size and pattern depending upon the type, size and shape of the material used to form the lumbar support member 30. In addition, varying the size of the openings 38 adjusts the flexibility and bending stresses in different regions or areas of the panel 36.
An upper flange 40 is located on the upper end 42 of the lumbar support member and a lower flange 44 is located at the lower end 46 of the lumbar support member 30. Both the upper and lower flanges 40, 44 extend rearward from the rear surface 39. That is, the flanges 40, 44 extend inward toward the seat frame 18 and away from the lower seating surface 20. The lower flange 44 also includes a mounting surface 50 located on the underside or bottom of the lower flange 44.
Mounting apertures 54 are located in the lower flange 44. Each mounting aperture 54 includes an L-shaped slot 56 having a leg portion 58 extending inwardly from the face 59 of the lower flange 44. A base portion 60 of the slot 56 extends parallel to the face 59 and terminates at a cylindrically shaped seat 64. An additional aperture 70 extends through the lower flange 44. The aperture 70 includes an L-shaped slot 72 terminating at a cylindrical seat 74.
The upper flange 40, like the lower flange 44 also includes mounting apertures 76 having L-shaped slots 77 terminating at cylindrical seats 78. The upper flange 40 further includes a pair of apertures 80 with a slot 82 extending to one of the apertures 80. In addition, the upper flange 40 includes apertures 66 for securing a spring member 105 to the upper flange 40.
Ribs 84 protrude outward from the rear surface 39 of the lumbar support member 30. The ribs 84 generally lie on a line extending between the upper flange 40 and the lower flange 44. While shown herein extending from the upper flange 40 to the lower flange 44, the ribs 84 may also end prior to reaching the ends 42, 46 of the lumbar support member 30. In addition, the ribs 84 may extend at an angle with respect to the upper 40 and lower 44 flanges. In addition, while shown as a single member having a rectangular cross-section, the ribs 84 may have various shapes and configurations.
When viewed from the side the ribs 84 have a plurality of indentations or relieved areas 88 extending along a portion of the length of the ribs 84. As shown in
As shown in
As shown herein, seated on the lower cross bar 26 of the seat frame 18 is the base member 96 of the frame 92. The serpentine configuration is such that it extends or is located adjacent to but does not cover the apertures 98 located in the lower cross bar 26. The apertures 98 are used to attach the guide structure 90 to the lower cross bar 26. The middle or center aperture 100 provides clearance for the adjustment cable 34 and enables the adjustment cable 34 to pass through the lower cross bar 26 of the seat frame 18. The upper ends 102 of the leg members 94 extend upward and are attached to the upper cross bar 24 of the seat frame 18. This may include extending the upper ends 102 of the legs 94 through apertures in the upper cross bar 24 and securing them to the upper cross bar 24 after attaching the base member 96 to the lower cross bar 26.
As illustrated in
To attach the lumbar support member 30 to the frame 92 the leg members 94 are deflected slightly inward, toward one another, and are slid into the leg portion 58 of the L-shaped slot 56 located in the lower flange 44 of the lumbar support member 30. Upon reaching the base portion 60 of the slot 56 the leg members 94 are urged outward until they enter into and are seated in the respective cylindrical seats 64 of the mounting apertures 54 located in the lower flange 44. The cylindrical seats 64 are sized such that the lower flange 44 of the lumbar support member 30 slides freely on the leg members 94 of the frame 92. As illustrated in
The upper end 42 of the lumber support member 30 is attached, in part, in a similar manner by again deflecting the leg members 94 of the frame 92 slightly inward and inserting them into the L-shaped slots 77. The leg members 94 slide in the slots 77 until they reach the respective cylindrical seats 78. The cylindrical seats 78 are sized such that the upper flange 40, and correspondingly the upper end 42, of the lumbar support member 30 moves freely along the leg members 94 of the frame 92.
The adjustment cable 34, such as a flexible motion transmitter or push pull type cable, includes a wire or cable 106 that slides within a cable housing 108, and is shown in the preferred embodiment as one way to adjust the curvature of the lumbar support member 30. This type of cable is often referred to as a Bowden cable. As shown in
The cable housing 108 includes an end fitting or ferrule 120 secured to the first end 118 of the cable housing 108. As shown in
As set forth previously, a further aspect of the invention includes a tension member that operates to reduce the force necessary to move the support member 30 outward as shown in phantom in
It should be understood that the cable 106 could be tightened by several different methods, all of which can provide a suitable means to correspondingly move the upper flange 40 of the lumbar support member 30 and vary the amount or degree of curvature of the lumbar support member 30.
Turning now in greater detail to the actuator 32, the housing 130 has first and second ends 138, 140. The first end 138 having a cylindrical bore 142 extending from the first end 138 toward the second end 140. The cylindrical bore 142 terminates prior to reaching the second end 140 of the housing 130. A shaped passageway or socket 144 extends from the base or bottom 146 of the cylindrical bore 142 toward the second end 140 of the housing 130. An aperture 148 is located in the second end 140 of the housing 130 and communicates with the shaped passageway or socket 144.
The aperture 148 is sized to receive a bushing portion 150 of a ferrule or end fitting 152 attached to the second end 128 of the cable housing 108. The end fitting 152 further includes a shoulder 154. The shoulder 154 is sized to provide a stop on the outer face 156 of the second end 140 of the housing 130. Accordingly, the first end 118 of the cable housing 108 is connected by the first end fitting 120 to the lower flange 44 of the support member 30 and the second end 128 of the cable housing 108 is connected by the second end fitting 152 to the housing 130 of the actuator 32.
The second end 126 of the wire or cable 106 has a ball 160 staked thereto. The ball 160 and cable 106 pass through the aperture 148 located in the second end 140 of the housing 130. Accordingly, the ball 160 and cable 106 to extend through the aperture 148 and are received in the screw member 132.
As illustrated, the screw member 132 has a threaded cylindrical portion 162 and a post portion 164. The post portion 164 is configured such that it has a cross sectional shape, illustrated in the preferred embodiment as a hexagon, that is complementary to the cross sectional shape of the shaped passageway or socket 144. The complementary cross sectional shape of the socket 144 and the post portion 164 enables the screw member 132 to move longitudinally within the housing 130 and prevents rotation about the longitudinal axis or direction of movement of the screw member 132 as illustrated by the arrow 158 in
The ball 160 staked to the cable 106 connects the cable 106 to the screw member 132. The ball 160 fits in a cylindrical seat 165 located in the post portion 164. A slot or groove 166 located in the post portion 164 receives the cable 106. Accordingly, as the screw member 132 moves longitudinally within the housing 130, in the direction of the arrow 158, the screw member 132 functions to increase or decrease the tension on the cable 106 and correspondingly adjusts the degree of curvature or outward bow of the lumbar support member 32.
The shell 134 is cylindrically shaped and sized to fit within the cylindrical bore 142 of the housing 130. The inner circumferential surface 168 of the shell 134 includes a plurality of threads 170. The threads 170 are complementary to and engage the cylindrical threaded portion 162 of the screw member 132. The distal end 172 of the shell 134 is positioned adjacent the bottom 146 of the bore 142. The outer circumferential surface 174 of the shell 134 includes a plurality of longitudinally extending grooves 176.
The knob 136 includes an annular flange 180 defining a cylindrical socket 182 of a size and diameter suitable to receive the shell 134. The socket 182 has a bottom surface 183. Tabs 184 project radially inward from an inner circumferential surface 186 of the socket 182. As shown in
In the embodiment illustrated in
The knob 136 further includes a latch assembly, seen generally at 190, that rotatably secures the knob 136 to the housing 130. The latch assembly 190 includes a plurality of locking fingers 192 formed on the outer end 188 of the annular flange 180. Each locking finger 192 includes an inwardly facing locking projection 194 adjacent an outwardly extending annular groove 196. A ramp surface 198 is formed on the leading end of the locking projection 194.
An inwardly extending annular groove 200 is located on the outer circumferential surface of the housing 130 near the second end 140 of the housing 130. The annular groove 200 cooperates with the second end 140 of the housing 130 to define an annular flange 202 formed on or located at the first end 138 of the housing 130. The annular flange 202 having a width or thickness less than the width or thickness of the annular groove 196 located in the knob 136.
To rotatably couple the knob 136 to the housing 130, the knob 136 is placed adjacent the housing 130 such that the ramp surface 198 of the locking projection 194 engages the annular flange 202 of the housing 130. Applying a suitable force to the knob 136 causes the locking projection 194 to deflect outward as the ramp surface 198 travels over the annular flange 202. Once the locking projection 194 travels past the annular flange 202, it snaps inwardly into the annular groove 196 located in the housing 130. Accordingly, the knob 136 is retained on the housing 130 as the locking surface 204 of the locking projection 194 engages the wall or corresponding locking surface 206 of the annular flange 202. As set forth previously, the size of the respective grooves, flanges and spacing is such that the knob 136 is coupled to and rotates freely about the housing 130.
A pair of ears 208 having mounting apertures 210 are connected to or formed integral with the housing 130. Mounting screws or fasteners extend through the mounting apertures 210 and secure the housing 130 to the seat bolster 14 at a location adjacent to the vehicle operator.
Accordingly, rotation of the knob 136 of the present invention correspondingly rotates the shell 134 causing longitudinal travel of the screw member 132 between first and second positions, as shown by the arrow 158 in
Accordingly, the present invention provides a lumbar support mechanism 10 including a lumbar support member 30 connected to an actuator used to position the lumbar support member 30 and a multitude of various positions.