US3909980A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Door operating mechanism
Assignee: H W CRANE CO
•
Filing: 1974-05-16
•
Granted: 1975-10-07
•
Expires: 1994-05-16
Abstract
Abstract This invention provides mechanism for opening and closing a door such as a garage door but applicable to other doors, including a trolley which moves back and forth on a track and controls the door movement. The invention provides novel means operable between the trolley and the track for latching and unlatching the trolley with respect to the track in a manner to effect safe, accurate and trouble-free operation of the door movements. The invention also provides a simplified and improved track and trolley construction whereby to make for greater economy in the cost of manufacturing mechanism of this type.
Inventors
- 👤 William B Courtney
- 👤 Edward I Fox
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 00:50
CPC Classifications
E; E05; E05F; E05F15/00; E05F15/60; E05F15/603; E05F15/665; E05F15/668; E05F15/681; E05Y; E05Y2201/00; E05Y2201/20; E05Y2201/218; E05Y2201/22; E05Y2201/23; E05Y2201/232; E05Y2201/24; E05Y2201/40; E05Y2201/43; E05Y2201/434; E05Y2201/60; E05Y2201/622; E05Y2201/64; E05Y2800/00; E05Y2900/00; E05Y2900/10; E05Y2900/106
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
301 words
Door operating mechanism comprising, in combination with a door movable back and forth between a closed and an open position, a tubular track rectangular in cross-section, a trolley formed of a single sheet of material shaped to fit around four sides of the track and adapted to slide back and forth lengthwise on the track, the opposite side members of the trolley depending in laterally spaced relation beneath the track, a lock pin fixed to the track, a latching lever located intermediate said side members of the trolley and having a hook end adapted to engage and disengage said lock pin, said side members each having an elongated slot in lateral registration with the other slot and extending parallel with the track, a link connected at one end to the door and having a pivot pin at its opposite end extending through said slots and pivotal therein, said latching lever having pivotal movement on said pivot pin for movement of its hook end into and out of engagement with said lock pin, spring means for yieldingly urging the latching lever on said pivot pin in a direction for locking engagement with the lock pin, a latch control pin extending between and fixed to said side members of the trolley, and a cam surface on the latching lever arranged to engage said latch control pin against the action of said spring means for controlling movement of the latching lever on said pivot pin, in which the pivot pin fixed to the door connected link has a lost motion coaction with the latching lever through the elongated slots whereby upon movement of the trolley in a door opening movement with described cam surface on the latching lever engages its coacting pin and disengages the latching lever from the pin fixed on the track.
Claim 2
Dependent Claim
301 words
Door operating mechanism comprising, in combination with a door movable back and forth between a closed and an open position, a tubular track rectangular in cross-section, a trolley formed of a single sheet of material shaped to fit around four sides of the track and adapted to slide back and forth lengthwise on the track, the opposite side members of the trolley depending in laterally spaced relation beneath the track, a lock pin fixed to the track, a latching lever located intermediate said side members of the trolley and having a hook end adapted to engage and disengage said lock pin, said side members each having an elongated slot in lateral registration with the other slot and extending parallel with the track, a link connected at one end to the door and having a pivot pin at its opposite end extending through said slots and pivotal therein, said latching lever having pivotal movement on said pivot pin for movement of its hook end into and out of engagement with said lock pin, spring means for yieldingly urging the latching lever on said pivot pin in a direction for locking engagement with the lock pin, a latch control pin extending between and fixed to said side members of the trolley, and a cam surface on the latching lever arranged to engage said latch control pin against the action of said spring means for controlling movement of the latching lever on said pivot pin, in which the pivot pin fixed to the door connected link has a lost motion coaction with the latching lever through the elongated slots whereby upon movement of the trolley in a door opening movement with described cam surface on the latching lever engages its coacting pin and disengages the latching lever from the pin fixed on the track.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-06 | 1979-04-07 | 1979-10-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-06 | 1983-04-07 | 1983-10-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-06 | 1987-04-07 | 1987-10-07 | $7700.00 | Window Closed / Lapsed |