|Publication number||USRE40001 E1|
|Application number||US 09/547,563|
|Publication date||Jan 15, 2008|
|Filing date||Apr 12, 2000|
|Priority date||Jun 1, 1995|
|Publication number||09547563, 547563, US RE40001 E1, US RE40001E1, US-E1-RE40001, USRE40001 E1, USRE40001E1|
|Inventors||Mark D. Siegler, James S. Chang, David J. Miller|
|Original Assignee||The Chamberlain Group, Inc.|
|Export Citation||BiBTeX, EndNote, RefMan|
|Patent Citations (33), Non-Patent Citations (11), Referenced by (12), Classifications (4), Legal Events (2)|
|External Links: USPTO, USPTO Assignment, Espacenet|
This application is a continuation of application Ser. No. 08/456,874 filed Jun. 1, 1995, now abandoned.
The invention relates in general to garage door operators and in particular to a jack shaft garage door operator having a pivoting arm for preventing cable associated with a pull-up cable drum from becoming slack during the operation of the door and for providing a positive door locking system.
One of the problems associated with jack shaft garage door operators is that while they are compact and may be conveniently used in garages which have little overhead room, they may present problems to the owners of the garage in that the cable may be payed out allowing the door to close under its own weight and if the door stalls or if the cable pay out drum rotates too far, the tension in the cable will drop and the cable may come off the drum necessitating a visit from a repairman.
In addition, the jack shaft garage door operator does not provide any secure locking facility other than a lock at the bottom of the door, which may be tampered with by a burglar. If the door is not locked by some other means, the bottom lock may be forced or damaged and the door can be lifted open and the garage entered by an intruder.
U.S. Pat. No. 3,785,809 discloses a door operator having a winch member built into a tilting door and movable with it. A cable is attached to a wall member supporting the door and another end of the cable is connected to an extensible arm.
U.S. Pat. No. 2,185,828 discloses a catch for stopping a door from falling in the event that a sustaining cable or a counterbalance fails or breaks.
U.S. Pat. No. 4,385,471 discloses a door including a stopping member having a clip connection 29 which engages a cable. If the cable breaks, as shown in
U.S. Pat. No. 4,520,591 to Calvagno discloses a system that is mechanically responsive to a break in a cable to prevent a door from falling.
French Patent No. 2634-815-A includes an “antidrop” safety mechanism having a cam plate 21 on either side of the door equipped with a convex toothed edge to engage a bracket in case of door suspension failure. None of the aforementioned documents teach or disclose solutions for preventing a door from being opened or from stopping an operation of a garage door operator to cause it to reverse to take up cable which may have inadvertently been payed off a cable drum of a jack shaft door operator.
What is needed then is an improved jack shaft garage door operator that avoids unwanted problems with the cable coming off the drum and provides security for the user.
A jack shaft garage door operator is useful for opening a and closing a movable garage door. The jack shaft garage door operator embodying the present invention includes a drive unit having an electric motor therein for driving a jack shaft. The jack shaft is mounted above a door opening and usually has coupled to it a spring, or the like, for providing a restoring force to the jack shaft to help raise the door and to support a portion of the weight of the door that is not supported by the L-shaped rails that a door usually rides in. A pull-up cable drum is connected to the jack shaft to be rotated thereby and has a multi-strand steel pull-up cable connected thereto that may be payed out to lower a door or wound up to raise the door. The pull-up cable is typically connected to a bottom portion of the door and, when wound up, will cause the door to rise along vertical portions of L-shaped rails. A pivotable arm is mounted on the garage near the jack shaft and includes an arm extension having a rounded surface which may be a roller or may be fixed for engaging the multi-strand steel pull-up cable. The pivotable arm, including the cable engaging portion, is biased by a spring causing the cable engaging portion to maintain the cable under tension in the drum. In the event that the cable is inadvertently payed out, for instance, by the door having reached the bottom of its travel and the operator continuing to run, the pull-up arm is allowed to pivot upwardly by reduced tension in the cable and swings far enough upward that an operator arresting dog comes in contact with a toothed wheel mounted upon the jack shaft causing the garage door operator to stall. The garage door operator is otherwise a conventional garage door operator and when in a stalled condition, automatically reverses, causing the cable to be payed in and the door to be opened. Thus, the pivotable arm prevents the cable from coming off the cable drum. In addition, a stop or means for preventing the garage door from opening in the form of a metal plate is bolted on an upper panel of the garage door and, when in the closed position, is immediately beneath the pivoting arm of the cable when it is pulled downwardly by full tension on the cable. If the door is attempted to be breached, for instance by an intruder attempting to lift the door, the cable becomes slack allowing the pivoting arm to come out slightly so that it then engages compressionally the stop plate on the garage door thereby preventing further upward motion of the garage door.
It is a principal aspect of the present invention to provide a jack shaft garage door operator having a mechanical cable tension sensor for providing door reversal before a cable pays off a cable drum.
It is another aspect of the present invention to provide a jack shaft garage door operator having a door opening block adapted to engage a pivoting arm to prevent a door from being forced open.
Other advantages of the invention will become obvious to one of ordinary skill in the art upon a perusal of the following specification and claims in light of the accompanying drawings.
Referring now to the drawings and especially to
The jack shaft garage door operator 10 includes a drive unit 20 having a jack shaft 22 coupled thereto to be turned thereby. A pull-up cable unit 24 is mounted on the jack shaft 22 to be turned and a pull-up cable 26 is wound around the cable drum 24 to be pulled upwardly. A pivotable arm assembly 28 is mounted on a header 30 of the garage 12 immediately above the door opening 14 adjacent the jack shaft 22 and includes a cylindrical cable engaging member or cable tensioner arm 34 for engaging the pull-up cable 26 and ending in a cable retaining knob 35 for preventing the pull-up cable 26 from sliding off the tensioner arm 34. A door lock bracket or means 36 for preventing the garage door from opening is mounted on the garage door 16.
More particularly, the garage door 16 is a multiple paneled door consisting of a plurality of rectangular panels 40, 42, 44 and 46. The panels 40 and 42 are connected by a plurality of hinges 50. Panels 42 and 44 are connected by a plurality of hinges 52. Panels 44 and 46 are connected by a plurality of hinges 54. The door is carried on a pair of rollers in a pair of L-shaped tracks, details of one of which are shown in
The pivoting arm assembly 28 includes a base plate assembly 80 mounted on the header 30 and a pivot 82 which supports a pivotable arm 84. The pivotable arm 84 includes a bracket-type stop member 86 having wall portions 88 and 90 supporting a cross bar 92. The pivoting arm 28 includes a bottom wall 96 and a pair of sidewalls 98 and 100 for providing strength thereto, in particular, compressional strength. The arm 84 is biased outwardly and upwardly by a spring 104 and is normally held in a substantially vertical position as shown in
In addition, if the drive unit 20 is stopped and the door 16 is attempted to be opened, in other words it is forced upward as shown in
Thus, what has been provided is a mechanical device for providing security for a garage door by preventing the garage door from being inadvertently opened while also preventing cable from being accidentally payed off the drums 24 and 26 which would necessitate an expensive repair call.
While there has been illustrated and described a particular embodiment of the present invention, it will be appreciated that numerous changes and modifications will occur to those skilled in the art, and it is intended in the appended claims to cover all those changes and modifications which fall within the true spirit and scope of the present invention.
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|Citing Patent||Filing date||Publication date||Applicant||Title|
|US7469737 *||Jul 25, 2006||Dec 30, 2008||Wayne-Dalton Corp.||Support system for a sectional door|
|US8001725||Sep 30, 2005||Aug 23, 2011||The Chamberlain Group, Inc.||Shaft joint|
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|US8935883||Jul 1, 2009||Jan 20, 2015||The Chamberlain Group, Inc.||Barrier operator with rack and pinion drive and coupling assembly for an integrated door and operator|
|US9217283||Mar 11, 2013||Dec 22, 2015||The Chamberlain Group, Inc.||Sensor device and controller for movable barrier operator systems|
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|US20060237150 *||Apr 21, 2005||Oct 26, 2006||The Chamberlain Group, Inc.||Shaft coupling for barrier movement operators|
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|US20100024308 *||Jul 1, 2009||Feb 4, 2010||Bruce Arthur Coubray||Barrier Operator With Rack And Pinion Drive And Coupling Assembly For An Integrated Door And Operator|
|U.S. Classification||49/199, 49/322|
|May 20, 2008||CC||Certificate of correction|
|Oct 28, 2009||FPAY||Fee payment|
Year of fee payment: 12