Patent GB-846414-A (GB)
Title: Cylindrical locks
IPC: E05B55/00
Filed: 1958-01-16
Abstract: 846,414. Latches; locks. PARKES & SONS Ltd., J., and BUTTER, F. J. Jan. 13, 1959 [Jan. 16, 1958], No. 1507/58. Class 44 Relates to so called cylindrical locks comprising a tubular mortice lock or latch and a casing 16 at right angles thereto for shanks 12, 13 of inside and outside knobs 10, 11, a bolt retractor and two rollbacks 17, 18 for independent operation of the retractor by either knob, in which each of the knobs incorporates a key-operated cylinder-type lock and the two knobs are operatively interconnected, by means operable by the respective knob locks, to ensure that key-operation of either knob lock will effect locking and unlocking of at least one of the knobs according to the direction in which the key is turned. According to the invention, the means operable by the respective knob locks and operatively connecting the two knobs, comprises a screw gear one element of which can be turned through 360 degrees by key operation of the plug of the cylinder lock in one knob but is restrained from appreciable axial movement, and the other element of which can be turned through 360 degrees by key operation of the plug of the cylinder lock in the other knob and moved axially under the screwing action, in one or other direction according to the direction of turning. In the arrangement according to Fig, 1, in which inside and outside knobs 10, 11 are rotatably mounted in bearings 14, 15 in the cylindrical casing to housing the bolt retractor (not shown), rollbacks 17, 18 secured to the handle shanks 12, 13 and fixed stops 19, 20, rotary plugs 23, 24 of cylinder-type locks 21, 22 are bifurcated to straddle tongues 25, 26 at opposite ends of the screw gear which comprises a rotatable but non- axially movable female element 27 carrying the tongue 26 and a male screw member 29 fixed to the adjacent end of an axially slidable spindle 30, the other end of which carries the tongue 25. Two sleeve members 32, 33 are rotatably mounted on the spindle 30 and are of square cross-section except for reduced portions 34 and 35 which are of cylindrical form. Holes in the rollbacks 17, 18 and the stops 19, 20 through which the sleeves pass, are all of square cross-section such that in the position shown, both knobs 10,11 are free for independent operation. Both knobs may be locked against operation, by a key inserted in either knob lock and rotated through 360 degrees in order to move the spindle 30 and the sleeves 32, 33 to a position in which the square portion of sleeve 32 engages both the stop 19 and the rollback 17 and in which the square portion of sleeve 33 at the outer end thereof engages the rollback 18 and the stop 20. Reverse rotation of either lock plug restores the parts to the positions shown. In a modification Figs. 2 and 3 (not shown), the element 27 is formed with a spiral slot and the male element is constituted by a boss secured to the corresponding end of the spindle 30 and carrying a peg which engages the slot. The element 27 may be surrounded by a sleeve. In another form, Fig. 4 (not shown) a spirally slotted sleeve is fixed to a boss on the end of the spindle and is engaged by a peg carried by the element 27. In the arrangement according to Fig. 5, the thread of the element 27 is afforded by a slot in an internal sleeve 43 which is engaged by a peg 39 on a boss 37 on the spindle 30, the sleeve being formed from a flat blank having therein an inclined slot. Since this slot does not provide a complete turn for the peg 39, an axially captive shell 44 is provided and includes a tongue 25 and is rotatable in the knob shank 12, between the rollback 17 and a retaining ring 45. A sleeve 46 is secured within the shell 44 and includes a slot which is engaged by a peg 47 fixed in a cylindrical piece 48 with a square opening in which a corresponding square end 49 of the spindle engages. The arrangement is such that the slot in the sleeve 46 allows the completion of the single turn of the plug 23 on 24 and withdrawal of the key therefrom, by permitting the element 27, boss 37, spindle 30 and piece 48 to rotate as a unit to the extent permitted by the slot. In another arrangement, Fig. 8 (riot shown), the two square section sleeves 32, 33 of the Fig. 1 arrangement are replaced by a single square section sleeve having two cylindrical reduced neck portions. In a similar arrangement, Fig. 9 (not shown) the reduced neck portions are so located that in the unlocked condition, both knobs turn together when either is operated by hand. In another arrangement, Fig. 10 (not shown) employing a single sleeve, only one reduced neck portion is provided, the arrangement being such that key operation of either knob lock will lock and unlock one knob only. In the arrangement according to Fig. 11 (not shown) the female element 29 is directly connected to the spindle 30 and the screw member 29 is coupled to the plug 24