Abstract: A casing for holding a key in one of two pivoted positions. The key pivots about an axis extending along one edge thereof when a lock is turned by the user of the key. An indicator may be attached to the key for extension through a small opening in the casing or housing when the key is in one position and for retraction below the level of the casing periphery when the key is in the opposite position. In a second embodiment, a portion of the casing may be pierced along three edges and arranged so that, when the key is in one position, the pierced portion is pushed above the casing periphery and, when the key is pivoted to the second position, the pierced portion is coextensive with or below the casing periphery. In a third embodiment, an indicator may be pivotally fastened in position between halves of the casing for movement (a) above and (b) even with or below the periphery of the casing when the key is pivoted.

Abstract: A locking key, designed to retain an indication of the lock-shifting (opening or closing) operation last performed, has a head and a shank interconnected by a screw coupling with limited axial play enabling their relative rotation through 90.degree. or 180.degree.. The shank and its bit can thus be positively entrained for a lock-opening or a lock-closing motion only after the head has arrived in one or the other limiting angular position relative thereto. When the idle rotation of the head is 180.degree., the relative angular position of the two parts can be indicated by special markings thereon.

Abstract: A locking device comprising driving members driven by a thumb turn from insie a room and by a key from outside the room, dead bolts brought into engagement with the driving members to advance or retreat to lock or unlock the room, and switches for detecting the advance and retreat of the dead bolts. Said dead bolts are formed by dividing the thickness of a dead bolt to two parts while said driving members by dividing the thickness of a driving member to two parts, said dead bolts are brought into engagement with said driving members to advance or retreat, and one of said driving members is driven by the thumb turn while the other by the key. An engaging means is provided between said driving members or dead bolts in such a way that said driving member driven by the thumb turn is rotated integral with the other driving member driven by the key only when the latter is rotated to lock the room.

Abstract: A mechanical magnetic key operated door lock structure particularly adapted for use in hotel locksets. An occupancy indicator is incorporated in the lock structure to indicate that the lockset is locked from the inside, thus insuring privacy for the hotel guest. In addition, means operable from outside the lock structure is provided for changing the combination of the lock so that a newly arriving guest may be provided with a key having a different combination from that used by the previous guest.

Abstract: Apparatus for providing a "hotel function" in a cylinder lock having a key-removable locking core in its outside knob. Actuation of a push button in the inside knob causes the core to be disabled from retracting the bolt and projects an indicator from the face of the outside knob. The key plug of the core is connected to rotate a throw member which is axially movable between an inward operative position and an outward disabling position. The throw member is connected to the roll-back cam by a flat blade slidable in a cross slot in the roll-back cam sleeve. In the operative position of the throw member, a full width section of the blade lies in the cross slot to clutch the blade to the roll-back cam, while in the disabling position, a narrowed section of the blade lies in the cross slot and is rotatable therein so as to declutch the blade from the roll-back cam.

Abstract: A lock for the door of an automobile which is provided with an electrical signalling circuit for indicating to the driver whether the lock is opened, partially closed, or fully closed. The lock has a main supporting body. A movable member is held on the body and assumes a first position when the lock is closed, a second position when the lock is partially closed and a third position when the lock is open. The lock also includes a magnet switch which is connected in the electrical signalling circuit. A projection is connected with the movable member such that when the movable member is in the first position at which the lock is fully closed, the projection is interposed between the reed relay and the permanent magnet and this interrupts the magnetic flux lines between the magnet and the reed relay contacts, causing the contacts to open and opening the electrical signalling circuit.

Abstract: There is disclosed a lock mechanism that has been designed to take up a minimum amount of space and thus be accommodatable in a relatively shallow structure. Said lock mechanism includes a pivotally mounted latch bolt, a deadlock member associated with said latch bolt, with biasing means urging said deadlock member to a locking position. To control the operation of the deadlock member there is provided a deadlock trigger and a deadlock position lever providing an operational connection between said trigger and the deadlock member. A primary operating lever as provided comprised of a first pivotally mounted arm portion and a second arm portion integral therewith and connected with the latch bolt by a loss motion connection. The pivot axis for said latch bolt, said primary operating lever and said deadlock member are disposed parallel to and adjacent the front plate of the casing structure, thereby enabling the lock mechanism to be accommodated and to function within a shallow casing structure.

Abstract: A rotary latch and its method of operation, the latch being caused to move between a position flush with a surrounding surface and a protruding position as the latch is moved between its latched position and its unlatched position, a rotary drive means, by reason of its protruding position, being readily visible to indicate the unlatched condition; the rotary drive means including a control sleeve having radially outwardly facing detent pockets engaged by a radially movable pin, one socket being engaged when the latch is in its flush-latched condition, second socket being engaged when in its fully unlatched condition, and a third socket being engaged as a secondary latch.

Abstract: A lock mechanism is included within the outer knob of a latch assembly. Associated with the inner knob is an alarm apparatus that includes a battery, a sound generator and a transducer for delivering an audible signal. The different components of the alarm apparatus are located either in an escutcheon associated with the inner knob or within the body of the knob itself. In either case, the latch assembly includes switch contacts which close to operate the alarm apparatus upon a very slight twisting of the outer knob.

Abstract: A method and a device to prevent unauthorized use of cassette tape recorders, comprising of a cassette shaped part, insertable into a cassette tape recorder through the cassette opening, said part being arranged with locking means, thus enabling the part to take up an interlocked relationship with the cassette tape recorder when inserted into same.

Abstract: A window latch and handle assembly exhibiting an attractive appearance while providing a high degree of strength and small size. The assembly employs a pair of body members which are secured to a door or window frame and a unitary handle and latch. The handle extends from one side of the assembly of the two body parts and the latch from the opposite side thereof. A lock member with an elongated arm surface engages a key slot in the handle and latch. When in one orientation, the locking member allows the handle and latch to move laterally against the resistance of return spring and when turned 90.degree., effectively prevents movement of the handle and latch by direct broad area contact with one of the body parts. When rotated 90.degree., the lock member rests in the key slot allowing limited movement of the handle and latch to release the door or window.

Abstract: A lock system controls exiting and entering of personnel, particularly in public and commercial structures by means of an alarm and a panic bar and key system to operate a lock through a series of interlocking controls including an internal panic bar, an internal key lock, an external key lock and a supplemental manual control. Four modes of operation are provided in which the panic bar is at all times operative and the alarm is selectively operative to provide, in addition to panic bar actuation or in combination therewith, authorized passage, authorized exit only, free passage in both directions and free exit only.