Closure fasteners – Bolts – Multiple
Patent
1980-07-07
1983-02-01
Moore, Richard E.
Closure fasteners
Bolts
Multiple
70145, 2923363, 292359, E05C 306
Patent
active
043712053
DESCRIPTION:
BRIEF SUMMARY
DESCRIPTION
1. Technical Field
This invention relates to door locks and, more particularly, to a door lock having a lock release apparatus operative by a pair of handles, one of which is remote from the locking mechanism and outside of the door, and the other of which is inside of the door.
2. Background Art
Some current doors for cabs, for instance, on tractors for bulldozers and the like, are locked from the outside using a key. The locks on some doors are such that they cannot be unlocked or operated from inside the cab when key locked from the outside.
There are some locks which are key locked on one side and have a mechanism on the other side for unlocking. For example, U.S. Pat. No. 2,682,763, issued to Williams on Jul. 6, 1954, shows a door latch which is key locked from the outside but has a mechanism on the inside which can be actuated on the inside to release the latch. Also, U.S. Pat. No. 1,908,958, issued to Coffron on May 16, 1933, shows a door latch which can be released from the inside and can have the bolt disconnected from the outside handles so that the outside handle will turn without moving the bolt. However, because of the size of many pieces of equipment currently having cabs, the handle for opening the lock from both inside and outside of the cab has been high off the ground. Since the locking mechanism has traditionally been close to the inside handle, the result has been that the outside handle has been well above ground level and, thus, difficult, if not impossible, to reach by persons standing on the ground, unless a ladder or other aid is used.
The present invention is directed to overcoming one or more of the problems as set forth above.
DISCLOSURE OF INVENTION
In one aspect of the present invention, a lock and linkage assembly is provided for operating a vehicle door latch. Interior and exterior handles are provided, with one handle being located with the lock assembly at one location and the other handle and latch being remote from the lock assembly and connected thereto by a linkage assembly. The lock assembly contains a cam element movable between locked and unlocked positions. When in the locked position, the cam element prevents the one handle located with the lock assembly from being turned. The other handle may be turned to move the linkage so as to engage the cam element and move it to an unlocked position. When unlocked, either handle may be turned to move the linkage to open the door latch.
A lock, a latch, and a linkage assembly is provided for a vehicle and the like which is operated from the outside and from the inside. The linkage assembly enables one handle to be placed remote from the lock assembly, a feature which is particularly desirable in large vehicles where the interior handle must be placed in a cab at a height far above that convenient to gaining access from the outside, where access is usually gained at ground level. When the lock assembly is locked, it prevents the exterior handle from being turned to open the door latch. The lock assembly may only be opened from the outside by a key. The interior handle may, however, at all times be turned to open the latch. Further, the interior handle can be operated to move the lock assembly to either a locked or unlocked position, in the latter case enabling the exterior handle to be operated to open the door latch.
The improved lock and linkage assembly provides improved operational features. The assembly enables the inside door handle to be located at a level easily reachable by a person in a vehicle cab and at the same time permits a person at the much lower ground level to have easy access to the exterior handle and key lock. The inside door handle may be used to lock, unlock, and unlatch the door. The outside handle may be turned, to unlatch the door only when it is unlocked. A key must be used to lock or unlock the door from the outside. This relatively simple structure provides safety and security and is durable and long lasting.
BRIEF DESCRIPTION OF DRAWINGS
FIG. 1 is a broken away elevational vie
REFERENCES:
patent: 1908958 (1933-05-01), Coffron
patent: 2682763 (1954-07-01), Williams
patent: 2791459 (1957-05-01), Roethel
patent: 3140888 (1964-07-01), DiSalvo
patent: 3232656 (1966-02-01), Coverley et al.
patent: 3312489 (1967-04-01), Trudeau
patent: 3361462 (1966-02-01), Foster
patent: 4049305 (1977-09-01), Zetterlund et al.
patent: 4216985 (1980-08-01), Sorensen
patent: 4277964 (1981-07-01), Crabb et al.
Caterpillar Tractor Co.
Moore Richard E.
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