Patent GB-1378125-A (GB)
Title: Cross bolt deadlock
IPC: E05B63/12
Filed: 1973-06-05
Abstract: 1378125 Locks IDEAL SECURITY HARDWARE CORP 5 June 1973 26746/73 Heading E2A A cross-bolt deadlock comprises a housing 5 adapted to be attached to a door 1 hinged in a door frame 2 and having a wall portion 11 defining notches 12 to open toward an adjacent part of the door frame, a strike 13 adapted to be mounted on the door frame and having lugs 14 disposed to be received in the notches 12 when the door is closed, the lugs having transverse openings 15, and a cross-bolt 18 mounted in the housing for limited movements in opposite directions parallel to the plane of the door across the notches and axially of the openings 15 in the strike. 13 when the door is closed, between locked and unlocked positions. A plunger 30 is carried by the cross-bolt for movements toward and away from locking engagement with the housing and a spring 31 yieldingly urges the plunger in a direction to engage the housing to releasably lock the cross-bolt selectively at opposite limits of movement thereof. A cam 37 is journalled in the housing for rotary movements in opposite directions from a given neutral position and has a pair of circumferentially spaced cam surfaces 44, 45 engaging the plunger 30 to move the latter and the cross-bolt in a different direction of movement of the cross-bolt responsive to rotation of the cam in an opposite direction from the said neutral position, and a third cam surface 46 angularly spaced from the cam surfaces 44, 45. A cam follower 47 is movably mounted in the housing for engagement with the cam surface 46, and a spring 52 urges the cam follower toward engagement with the cam surface 46, whereby to urge the cam toward the neutral position' thereof in all positions of the rotary movement of the cam away from the neutral position. As shown, the cross-bolt 18 includes spaced arms 20 each carrying a cylindrical bolt 21 for reception in the opening 15 of a respective lug 14, the body 19 of the cross-bolt having lugs 22 longitudinally slidable in a guide track 23 and providing a channel 29 in which the spring-loaded plunger 30 slides, the latter having a head- 34 formed with opposite, flat sides for engagement with the sides of a lug 35 projecting from a bearing boss 36 integral with the wall 6 of the housing 5; with the head 34 disposed at one side of the lug 35, Fig. 4, the cross-bolt is releasably locked in a release position with the bolts 21 disengaged from the lugs 14, and with the plunger retracted against the spring 31 the cross-bolt can be moved to its locking position whereby the bolts 21 are received in the lugs 14, the head 34 of the plunger then being disposed adjacent the opposite side of the lug 35 to positively hold the cross-bolt against sliding movement towards its release position. Retraction of the plunger 30 is effected by a selected one of a pair of cams 37, 38, the cam 37 being secured to the stem 39 of a knob 40. Each cam has pairs of cam surface portions 44, 45 adapted to engage the plunger head 34 to retract the same and move the plunger and cross-bolt from its locking to release position or vice versa. A cylinder lock plug 56 has a locking spindle 55 received in an opening 65 of a rotatable hub 64 to which the cam 38 is secured the latter being rotatable in opposite directions by a key inserted into the lock plug from the exterior of the door 1. A lock bolt 66 has a leg 68 provided with notches 70 and, with the cross-bolt in its locking position, is slid laterally so that the notches engage a C-shaped detent 71 and the body portion 67 thereof is disposed between the shoulders 73 of the guide track 23.