Abstract: A padlock comprising a body having a pair of parallel bores therein adapted to receive the legs of a shackle, and a shackle having a pair of parallel legs slidably received in said bores. A locking means is positioned within the padlock body to secure the shackle in the body when the legs are depressed into the bores. An interchangeable means, such as a standard cylinder lock, is provided for releasing the locking means and includes key-operated means operable by turning movement of a key to effect the release of the shackle from the locking means to allow one of the shackle legs to withdraw from the padlock body. The padlock body has an opening to receive the interchangeable means to permit positioning the interchangeable means within the padlock body. Detachable cover means adapted to close the opening is provided. Fastener means, such as a screw member, operable from within the body, is engageable in fastening relation with the cover means.

Abstract: An electric strike type door lock in which the strike tongue is releasably held in its latch bolt securing position by a ball seated in a bore in a wall of the housing in which the strike tongue is mounted. Toggle linkage holds the ball in an operative position projecting from the mouth of the bore and into a pocket in the adjacent surface of the strike tongue, when the toggle linkage is in an extended condition with its knee joint slightly across dead center. A low powered solenoid operatively connected with the knee joint of the toggle, initiates collapse of the toggle and thereby enables the ball to be expelled from the pocket in the strike tongue by door opening force transmitted through the latch bolt onto the strike tongue.

Abstract: A pincer-like tool for attaching a selected slotted plastic head to the shank of a key and for detaching the head therefrom. The tool has a pair of pivotally connected members, one of which provides the body of the tool and has opposite flat-surfaced sides, each of which is designed to receive and hold a slotted plastic head in position to have the shank of a key forced into its slot or expelled therefrom -- depending upon which of the two sides of the body the head is placed on -- by the advance of a carriage that is slidably mounted on the body; the other one of the pivotally connected members being a short and long armed bell crank lever having its short arm drivingly connected with the carriage and its long arm overlying a handle on the body to form a pair of pincers which, upon being gripped and squeezed together, advance the carriage.

Abstract: A rotary cutter type key cutting machine for duplicating keys in which the V-shaped notches that define the bitting are obliquely oriented both left and right. Identical vises mounted on a hinged carrier which swings about an axis parallel to that of the rotary cutter, grip the pattern key and the key blank and present the same respectively to a position-identifying stylus and the rotary cutter. The vises are rotatable in unison about their connections with the carrier, permitting them to be so oriented that as the carrier is swung towards the axis of the cutter, the bitted and about-to-be-bitted edges of the pattern key and the key blank are either parallel to the cutter axis or inclined with respect thereto in one direction or the other depending upon the direction the vises have been rotated.

Abstract: In a vehicle having an ignition switch, headlights and a storage battery, a relay has its winding in series with the battery and the collector-emitter circuit of a transistor and has normally open contacts in a headlight energizing circuit. A resistance-capacitance time delay circuit, connected with the ignition switch, controls bias of the transistor. Hence the transistor conducts whenever the ignition switch is "on" and for a short time after it is turned off; and while it conducts, the relay contacts are closed and the lights are energized.