Abstract: A cylinder lock is capable of providing a changeable keyway by means of elongated warding members which are insertable into a keyway access slot which has a cross-sectional configuration larger than for a desired key. There may be one or more warding members which are insertable into the plug and extend the length of the keyway access lot to define the cross-sectional area of a desired key.

Abstract: A method for installing and assembling electronic circuit board component systems utilizes templates having installation instructions and conductor terminal markings printed thereon, which are temporarily mounted onto the circuit boards during wire connection assembly. In one embodiment, the circuit boards are advantageously configured with semiconductor logic and memory components on a separate board from hard wired and power supply components, which are less susceptible to failure.

Abstract: A dropbolt lock having a pair of dropbolts movable between knuckles is assembled on a formed steel assembly plate which is attached to a base plate, the assembly plate providing the spaced knuckles. A cam operator operates the dropbolts between true dead lock positions. On the inside of the lock, a cylinder lock or a thumb turn may be assembled by a single screw. The cover is provided with attachment screws which are concealed by the locking bolt when in locked position.

Abstract: A T-handle lock assembly for vending machines or the like include a two-piece cylinder front handle and cylinder/extension rod housing subassembly which interlock by means of first and second asymmetrical flange edges integrally formed on the housing and corresponding recessed slots within the cylinder front handle. A single set screw is threaded into an aperture in the front handle extending in the direction of the slots to engage and rigidly secure the housing to the handle so that the lock cylinder is in alignment with a key access passage in the front surface of the cylinder front handle. The arrangement prevents access to the lock cylinder when in a locked condition even if the set screw is removed.

Abstract: A high security post lock according to the invention includes a hardened shell having a head member at one end thereof and an eccentric locking cam rotatably mounted at the other end. The lock is adapted to be inserted through an opening passing through a door frame and a door to secure the door. In a first or open position, the circumference of the cam is coextensive with the circumference of the shell, so that the lock can be inserted into and withdrawn from the door. In a second or locked position, the locking cam projects outwardly from the shell to prevent withdrawal of the lock and thus secure the door. Movement of the cam is limited by a pin and groove arrangement.

Abstract: A hybrid key for operating both electronic and mechanical locks has the electrical components in a separate and removable housing which is normally secured to the bow portion of the key blade but may be removed, the disclosed means for securing the electrical housing to the key bow is via a configuration including grooves in the housing, a hook portion on the key bow, and holes through the housing and bow at a single point for rivet securing means.

Abstract: A removable core cam lock of the type having a key operated core within a shell, is provided with a spring clip controlled by a core removal key which is longer than an operating key. The spring clip fits in a groove in the core and extends through a slot in the shell so that when the core removal key is put into the lock it operates the lock and on rotation of the lock it lifts the spring clip to allow core removal.

Abstract: A combination switch lock/cam lock assembly which includes a one-piece shell, a plug with a tenon, an electrical switch, and a cam is insertable from the front face of a panel opening by not affixing the cam until after the lock is inserted. After the lock is inserted in the panel and secured by a panel nut, the cam is installed by insertion through a slot in the shell to engage and be rotated by the tenon, and a spring-like retainer carried by the cam grips the tenon to retain the cam on the tenon and prevent the cam from being easily removed from the shell.

Abstract: A key according to the invention includes one or more bits which are offset forwardly or rearwardly of a corresponding tumbler axis of a twisting tumbler lock with dual locking function having tumbler points at tumbler positions selectively offset forwardly or rearwardly and selectively rotatable to different angular positions to create an enormous number of keying combinations.

Abstract: A cylinder lock of the type having twisting tumblers operated by a bitted key having at least one skew-cut bit provided with a side bar which is symmetrical with regard to a radius through a center of the key plug perpendicular to the plane of the key so that the side bar intersects not only slots in the twisting tumblers, but the profile of the key. The key has slots in its side face which extend perpendicular to its longitudinal axis.

Abstract: A telescoping coin vault box for a coin-operated machine defined by telescoping cylindrical first and second box portions having a slot for admitting coins into the coin box. The box portions are telescopically slidable relative to each other between extended and contracted positions to fit different size coin vaults.

Abstract: A high security drop-bolt lock assembly for a door includes a cylinder lock carried by a guard plate positionable on the outside of the door with the cylinder lock within the door, and a drop-bolt assembly on the inside of the door. The drop-bolt assembly is connected to protected studs extending from the guard plate to make a strong unitary construction extremely difficult to defeat and protecting the cylinder lock behind the guard plate and within the door.

Abstract: A twisting tumbler lock with dual locking function has tumbler points at tumbler positions selectively offset forwardly or rearwardly and selectively rotatable to different angular positions to create an enormous number of keying combinations. A key according to the invention includes one or more bits which are offset forwardly or rearwardly of a corresponding tumbler axis.

Abstract: A mechanism for smoothly and reliably operating a drop-bolt lock in which the drop-bolt operating mechanism includes a slidable bolt member carrying a cross slidable biased actuator member operable by cams for smooth sliding operation. Guide rails guide the sliding movement of the bolt member and the actuator member it carries, but the guides include a stop for cooperating with a lug on the actuator member to stop movement of the bolt unless and until the actuator member is forced away from the stop.

Abstract: A pop-out T-handle assembly of the type containing a lock cylinder having high security features which defy forced entry is disclosed. A cylinder front handle and cylinder/extension housing are assembled around the cylinder lock and rigidly secured for protection against pulling the lock. The face of the cylinder lock is preferably protected by a freely rotating cylinder protector plate to protect against drilling into the cylinder lock. A locator tab and slot arrangement assures alignment of the cylinder lock bolt and a corresponding opening in the T-handle housing, as well as restricts lateral movement of the cylinder front handle within the T-handle housing to protect against prying. A T-handle clutch arrangement of a generally square configuration provides extensive bearing surface to absorb torque and prevent wear.

Abstract: A rim cylinder protection unit includes a single flat thick solid hardened steel guard plate counterbored to receive the rim of the cylinder. The cylinder is secured to the plate and prevented from rotation by cooperation with a cylinder retaining plate attached to the backside of the guard plate. The thick solid steel guard plate has heavy mounting studs welded by hardened material to the plate to extend through the door and these studs are protected by hardened steel sleeves to prevent burglars from chiseling through the studs. A replaceable cover conceals the rugged steel guard plate.

Abstract: A padlock of the type having a removable locking plug or cylinder capable of being removed from the top through a top opening in the lock case, also has a cap for the top opening. This cap is locked into the padlock case by a loose ball fitting in a groove in the cap and in the case. This cap locking ball is in addition to two other conventional locking balls used to lock the shackle in one conventional type padlock. The shackle is retained by another ball which is carried by a shackle leg and cooperates with another groove in the case. The shackle locking ball is placed in or out of locking position by adjustment of a set screw in the shackle leg.

Abstract: A closure for a padlock body containing a removably fixed lock cylinder primarily comprising a circular member having a concave recess in its perimeter coacting with the shorter leg of the padlock's shackle at the top of the padlock, the underside of the said member having a bayonet-like latch preventing the member from being withdrawn from the top of the padlock via coacting with the interior of the padlock body wherein the aforesaid lock cylinder is enclosed unless the member is rotated a predetermined amount, and the rotation of the member being prevented by the said leg of the shackle being in its proper socket in the body of the padlock in its locked position. The keyway to the lock cylinder for locking and unlocking the padlock is in the bottom of the padlock extending into the padlock body as is well known in the art.

Abstract: A removable core cylinder lock utilizing twisting tumblers and a latch bar provides maximum security. Both operating and control keys have at least one skew cut bit to operating the twisting tumblers. A centrally positioned cylinder retainer is rotatable with a control key to remove the lock from its shell.