Patent GB-1200346-A (GB)
Title: A door bolt operating device
Inventor: RHYMES ALBERT WILLIAM
IPC: E05B3/00
Filed: 1967-10-25
Abstract: 1,200,346. Releasable fastenings. WEST ALLOY DIECASTINGS Ltd. 17 Jan., 1969 [25 Oct., 1967], No. 48542/67. Heading E2A. A bolt operating device for use with an outside door handle which incorporates a looking mechanism, comprising a mounting member adapted to be secured to an end portion of spindle A of the outside handle which projects from the inside of a door and which carries a throw member 1 which is slidably displaceable on said mounting member from an engaged position in which it is constrained to turn with said mounting member to a free position in which it can be turned independently thereof said throw member embodying an inside operating handle 2 and being spring urged to said engaged position, said throw member being adapted for operative coupling to door bolts. In the construction shown the mounting member consists of a circular section spindle portion 4 which extends through a bore in the throw member the mounting member having a head 5 which projects from the throw member 1 at that end of the throw member which is remote from the handle 2. The bore in the throw member has an enlargement 6 at the handle end which contains a coiled compression spring 7 and which extends into a recess 8 which is an enlargement of the bore of still greater diameter. On the end of the mounting member which is remote from the head 5 there is secured thereto by a screw an end plate 9 which serves as a seating for one end spring 7. The opposite end of the spring bears against the base of the bore enlargement 6 and urges the throw member 1 to a position to bear against a head 5 but so that the throw member can be slidably displaced in the opposite direction away from the head 5 in opposition to the spring 7. The head 5 of the mounting member has a square section axial cavity 10 for receiving the end portion of the spindle A and the head 5 also has a cross bore through which is passed a split pin 11 which also passes through a cross bore in the spindle A and thus secures the mounting member to the spindle A. The end portion of the throw member 1 which is remote from the handle 2 has a recess 12 in the base of which are diametrically opposite notches 13 constituting female dog formations. Body projections 14 which are at diametrically opposite positions stand up in the recess 12, each of the projections 14 having a side face which coincides and forms a continuation of a side face of the adjacent notch 13. Extending from the head 5 of the mounting member are diametrically opposite male dog formations 15 which engage with the female dog formation 13 when the throw member is in its normal position bearing against the head 5, consequently turning of the spindle A turns the throw member 1 with it and thus operates the door bolt or bolts coupled to the throw member. When the throw member is moved along the spindle portion 4 against the pressure of the spring 7 the dog formations are disengaged and the handle 2 can be turned independently of the spindle A so that even if the locking mechanism of the outside handle is locked so that the spindle A cannot be turned, the bolts can still be moved to releasing position from outside the door. The projections 14 by contact with the male dog formations 15 limit the turning movement of the handle.