Patent GB-1155135-A (GB)
Title: Improvements relating to Locking Mechanisms
Inventor: GREEN EDWARD RAMSAY
IPC: A47K5/12
Filed: 1966-11-18
Abstract: 1,155,135. Releasable fastenings. NEWTON, CHAMBERS & CO. Ltd. 16 Feb., 1968 [18 Nov., 1966], No. 51852/66. Heading E2A. A lock mechanism for locking together three relatively movable members 2, 5 and 12 comprises a single bolt 8 slidably mounted for movement in the member 2 into locking position with respect to both the members 5 and 12, in combination with a removable key which is adapted to engage and move the bolt to unlock the member 2 from the member 12 subsequent unlocking of the member 5 from the member 2 having obtained by relative movement of the thus unlocked members 2 and 12. In the construction shown the member 5 is a soap container, the member 2 is a dispensing head and the member 12 is an attachment bracket adapted to be mounted on a wall surface by screws passing through holes 13. The dispensing head has ears 14 which are slidable into (inwardly opening channels 15 of the bracket 12 to fasten the head to the bracket and the container 5 has a number of inclined lugs 6 which are adapted to pass between inwardly directed lugs 7 in the mouth of a socket 4 of the dispensing head, subsequent rotation of the container engaging the lugs 6 behind the lugs 7 to fasten the container to the head. When the assembled dispensing head and container is engaged with the bracket by sliding the ears into the channels 15, the back of bolt 8 is brought into engagement with a ramp 17 of the bracket and then with a ramp 18 of the bracket whereby the bolt 8 is deflected both forwards and sideways within a non-circular bore 9 of the head against the force of a spring loaded plunger 10; when the head is slid fully onto the bracket 12 the back of the bolt lies below the ramp 18 and its urged sideways beneath it by the plunger 10 so that the head is locked to the bracket; the bolt 8 then projects into the socket for a suitable amount so that any attempt to rotate the container 5 brings one of the lugs 6 of the container into engagement with the head of the bolt to prevent further rotation. To release the head from the bracket a tongue 20a of the key (Fig. 5) and part of the shank portion 20 of the key are inserted into an aperture in a plug 22 secured at the mouth of a recess 23 in the head 2, the key then being rotated to align the tongue 20a with a key hole slot 24 which opens adjacent the bolt 8; pressing the key inwards to pass the shank and tongue through the slot 24 causes the tongue to engage with and deflect the bolt 8 from beneath the ramp 18 against the force of the spring loaded plunger 10; the head 2 can then be withdrawn from the bracket 12 and since the bolt 8 is no longer held in the position in which it projects into the socket 4 the container 5 can be rotated to releasing position the bolts being retracted automatically by one of the lugs 6 of the container engaging it. In a modified construction Fig. 7 the bolt 28 is only capable of axial movement and it is biassed by a spring 31 towards the bracket 12a; when the dispensing head 2a has its ears engaged with the channels of the bracket as previously described the bolt is moved to the left as shown by engagement with an inclined ramp 38 of the bracket until a nose 32 of the bolt becomes aligned with. a hole 33 in the bracket when the nose moves into the hole and locks the head to the bracket. In this position of the bolt the tail end portion 35 of the bolt projects into the socket 4 so that rotation of the container 5 moves one of the lugs into engagement with the bolt to prevent further movement of the container. To release the head from the bracket the bolt is removed slightly to the left as shown by means of a key which has a pinion which is engageable with a rack portion of the bolt; when the head is unlocked it can be removed from the bracket and the spring then withdraws the bolt from the socket so that the container can be removed from the head. To engage the bolt the key passes through a plug in the head which has a shape corresponding to that of the pinion.