Cutting by use of rotating axially moving tool – With work-engaging structure other than tool or tool-support – Work-gripping clamp
Reexamination Certificate
2000-06-30
2001-10-23
Howell, Daniel W. (Department: 3722)
Cutting by use of rotating axially moving tool
With work-engaging structure other than tool or tool-support
Work-gripping clamp
C408S11500B
Reexamination Certificate
active
06305886
ABSTRACT:
TECHNICAL FIELD OF THE INVENTION
This invention is related in general to door locks and padlocks, and in particular to a fixture and methods for opening locks and for removing lock cylinders from door locks and padlocks.
BACKGROUND OF THE INVENTION
The owners and operators of storage building units, apartments, boat houses and the like, often have renters who fail to remove padlocks and take door lock keys when leases are terminated. Frequently, the owners of such units are required to remove door locks and padlocks without use of a key so that new tenants may use such units. Typically, either the shackles on such locks are cut, the tumbler pins are drilled from cylinders in the locks, or cylinder retaining fasteners are drilled to release the cylinders from the bodies of the locks. In some cases, the lock cylinders may be replaced and the locks reused, provided that the cylinders are the re-keyable type and the locks are carefully drilled. However, carefull drilling of the locks is often difficult since the locks are typically made of hard materials, such as hardened steel or alloys of special hardness, to make it difficult to drill the tumbler pins from the locks. Some fixturing has been suggested to aid in placement of the drill for drilling the tumblers for opening locks or removing the cylinders from such locks. Locks are typically drilled without fixturing, which often causes damage to the locks and breaks drills due to the difficulty of maintaining the drills in stationary positions while drilling.
SUMMARY OF THE INVENTION
A drill guide fixture and method of using the drill guide fixture are provided for guiding a drill into door locks and padlocks of various configurations and sizes. The drill guide fixture has a guide jaw, a latch jaw and a guide arm, which are secured together with a latch bolt and a guide bolt. The guide jaw and the latch jaw are fastened to together with the latch bolt on opposite sides of a lock to clamp the drill guide fixture to the lock. Preferably, several lengths of latch bolts are provided to accommodate locks of various sizes. The guide arm is of an elongated shape having a longitudinally extending slot in a central portion thereof for securing with the guide bolt to the guide jaw and the latch jaw. The guide jaw and the latch jaw have v-shaped notches within each of which scalloped-shaped recesses are formed to aid in clamping the guide jaw and the latch jaw of the drill guide fixture to round bodied door knobs and round padlocks. A drill guide hole is formed through the guide arm and spaced apart from the longitudinally extending slot for aligning with the shear line of a lock cylinder for guiding a drill into the tumbler pins of the cylinder. Some padlocks have a screw which fastens cylinders to the padlock bodies. These screws may be drilled to release the cylinders such that they may be removed from within the bodies of the padlocks for re-keying. For such padlocks, a second drill guide hole through the guide jaw is used to guide a drill into the body of the lock and sever the screw holding the cylinder in the padlock body. Then, the drill hole in the padlock body may be sealed by threading the drill hole, installing a screw, and lastly removing the head from the screw and polishing the cut end of the screw flat.
REFERENCES:
patent: 2602238 (1952-07-01), Wellman
patent: 2619730 (1952-12-01), Carter
patent: 2804788 (1957-09-01), Humphrey
patent: 2843167 (1958-07-01), Rushton
patent: 2928441 (1960-03-01), Farrow
patent: 3062076 (1962-11-01), Craig
patent: 4153384 (1979-05-01), Isaken
patent: 4194861 (1980-03-01), Keller
patent: 4461603 (1984-07-01), Klee et al.
patent: 5713225 (1998-02-01), Smith
patent: 1553278 (1990-03-01), None
Handley Mark W.
Howell Daniel W.
Washington Terrence
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