Jack shaft garage door operator

a technology of operator and shaft, which is applied in the direction of door/window fittings, building braking devices, construction, etc., can solve the problems of cable dropping, cable coming off the drum, shaft garage door operator does not provide any secure locking facility, etc., and achieves the effect of reducing tension and preventing further upward motion of the garage door
USRE40001E1Inactive Publication Date: 2008-01-15THE CHAMBERLAIN GRP INC
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Patent Information

Authority / Receiving Office
US · United States
Patent Type
Patents(United States)
Current Assignee / Owner
THE CHAMBERLAIN GRP INC
Publication Date
2008-01-15
Estimated Expiration
Not applicable · inactive patent

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Abstract

A jack shaft garage door operator for opening and closing a movable garage door has a drive containing an electric motor. A rotatable jack shaft is connected to the drive unit to be driven thereby. A pull-up cable drum is connected to and driven by the jack shaft. A pull-up cable extends from the drum about which it is wound and connects to a bottom part of the garage door to raise the door. A pivoting arm is mounted near the jack shaft and provides tension to the cable. A shaft lock hub mounted on the jack shaft is engaged and locked by the arm if the tension in the cable drops. A stop is mounted on the garage door for engagement by the movable arm in the event that the door is opened without the cable being drawn in the cable drum.
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Description

[0001] This application is a continuation of application Ser. No. 08 / 456,874 filed Jun. 1, 1995, now abandoned.BACKGROUND OF THE INVENTION

[0002] 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.

[0003] 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.

[0004] In addition, the jack shaft garage door operator does not ...

Claims

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