Convertible cylinder lock

Details Convertible cylinder lock Convertible cylinder lock

1999-03-30

2001-01-30

Gall, Lloyd A. (Department: 3627)

Locks

Special application

For control and machine elements

C070S215000, C070S224000, C070S360000, C070S371000, C070S462000

Reexamination Certificate

active

06178789

ABSTRACT:

TECHNICAL FIELD
This invention relates generally to cylinder locks and particularly to cylinder lock handles used with door latches such as those on delivery vans.
BACKGROUND OF THE INVENTION
Key operated cylinder locks have long been used for locking doors, file cabinet drawers and the like. Prevalent among such is their use in locking the doors of panel trucks and vans. These vehicles ordinarily have both a sliding side door as well as a hinged rear door. Both doors are latched and unlatched by rotatable handles. For security these handles are equipped with key operated lock cylinders. In some cases a stationary lock cylinder is used which means that the cylinder is not depressible but remains fixed along its axis in both its locked and unlocked positions. To lock or unlock a stationary cylinder lock a conventional metallic key is simply inserted into it and rotated. Nevertheless both locking and unlocking of the doors require use of a key. This is a desirable feature in that the door cannot be closed and locked accidently. On the other hand a push-to-lock type cylinder, which does having limited axial movement, can be more readily locked since it does not require a key. One merely pushes it in to lock. Thus some customers, such as van fleet purchasers, may prefer one or the other for both the side and rear door while others may prefer one type for one door and another type cylinder lock for the other door. The van body manufacturer thus needs the flexibility of being able to install the door latch and handle during body manufacture with the ability to install the desired key coded cylinder lock later in the field.
To meet this goal Kason Industries, Inc. has recently produced two door handles with factory keyed cylinder locks of both the stationary and the push type. However, it would be more effective if a single handle and cylinder assembly that could be readily converted to either stationary or push operation in the field were to be devised with the ability to field select key codes (cylinder number). It is to this end that the present invention is primarily directed.
SUMMARY OF THE INVENTION
Briefly described, a convertible cylinder lock comprises a housing having a channel sized to receive a lock cylinder and a slot that extends along and spacially communicates with the channel that is sized to receive a spring loaded lock cylinder bolt. A lock cylinder with spring biased lock bolt is mounted in the channel. The lock also has a bolt lock plate that is sized to be received in reversible orientations within the slot. This plate has two stops spaced apart a distance to receive and entrap the cylinder bolt therebetween. One of the plate stops has a ramp for camming engagement with the spring loaded cylinder bolt whereby in one lock plate orientation the bolt is locked out of the lock plate and in its reversed orientation the lock plate receives and entraps the bolt. Preferably the lock is of a pop out design with the housing channel having a ramp to cam the bolt to an unlocked position upon rotation of the cylinder.


REFERENCES:
patent: 3744283 (1973-07-01), Schmidt
patent: 4484462 (1984-11-01), Berkowitz
patent: 4553415 (1985-11-01), Maffey
patent: 4565080 (1986-01-01), Kincaid et al.
patent: 4697444 (1987-10-01), Maffey
patent: 4991414 (1991-02-01), Moore et al.
patent: 5634357 (1997-06-01), Nutter et al.
patent: 1915618 (1970-10-01), None
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patent: 2172331 (1986-09-01), None
patent: 2219035 (1989-11-01), None
patent: 2263304 (1993-07-01), None
patent: WO 90/06412 (1990-06-01), None
Kason Catalog 6, p. 106, Kason 4001 locking handle.
Kason Catalog 6, p. 110, Kason 4168 locking handle.
Illinois Locks Catalog, p. 19, Illinois Lock D6714 locking cylinder.
Illinois Locks Catalog, p. 19, Illinois Lock D8714 locking cylinder.
Chicago Lock Co. Catalog, 3-7, Chicago 180-4255 Handle cylinder.

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