Patent GB-1317436-A (GB)
Title: Key operated cylinder lock mechanism
IPC: E05B35/00
Filed: 1969-06-30
Abstract: 1317436 Lock mechanisms VEEDER ROOT Ltd and REGENT LOCK CO Ltd 17 June 1970 [30 June 1969] 32820/69 Heading E2A [Also in Division H1N] A cylinder lock mechanism, comprises a body, a plug 20 rotatable within the body, a first group of axially divided tumbler pins 42, 46 extending parallel to the axis of the plug in bores 32, 34 extending, when the mechanism is in a first, locked condition, from the rotatable plug into the body through an interface perpendicular to the axis of the rotatable plug, the one ends of the tumbler pins being engageable by a combination of recesses 58 or protuberances formed adjacent the one end of the body of and common to each of a plurality of generally cylindrically bodied keys 10 individually insertable into the keyway 56 formed in the mechanism coaxial with the plug so as to displace the pins and align their axial divisions with the interface whereby to permit movement of the plug relative to the body by an inserted key into a second, unlocked position, wherein the mechanism is provided with a second group of pins 44 located in bores 36 extending through said rotatable plug parallel to its axis so that their one ends are selectively engageable for axial displacement by different of said keys insertable in said keyway according to differing configurations of said keys, and a plurality of switches 66, 68 operable in different combinations in accordance with which of the pins in the second ring are displaceable by any particular key. In the construction shown each of the tumbler pins is biassed by a spring 40 against a shoulder of the rotatable plug 20; the plug 20 consists of a body 18, a spigot 21 and a shaft 24 the spigot defining the keyway 56 together with a portion 2 of the mechanism body. The shaft 24 extending through a fixed plug 30 and is adapted to carry or control a bolt or a switch. The body 18 of the plug 20 is trapped between a shoulder of the mechanism body and the plug 30. The pins 44 are biassed by springs 52 so that one end portion of each protrudes and engages a shoulder of the mechanism body. The switch operating means as shown are pins 48 disposed in bores in the plug 30 the bores being circumferentially displaced from the bores in the rotatable plug 20 when the plug 20 is in the locking position. Each of the pins 48 has a mushroom shape head and the pins are biassed into engagement with the rear face of the rotatable plug by springs 38. The entry of the key into the keyway displaces one or more of the pins 44 to cause the rear end portion of the or each to protrude and when the rotatable plug is rotated the end portion or portions engage the corresponding pins 48 and displace it or them rearwardly to operate the associated switch. The particular switch or switches which are operated indicate the key which has been used to rotate the plug 20 to releasing position. The switches are carried by a plate 64 the pins 48 engaging resilient switch contact blades 66 normally disposed in the switch open position by their own resilience when the blades are moved they engage a contact ring 68 also carried by the plate 64. The shaft 24 also carries a cam 70 which operates an additional contact set on the plate 64. In an alternative construction the pins corresponding to the pins 48 when moved by entry of a key into the keyway extend beyond the rear face of the body of the lock and when the plug is rotated lever actuators of microswitches are engaged by the protruding rear end portions to actuate the corresponding microswitches. The microswitches are carried by a plate corresponding to the plate 64. A second plate axially beyond the first plate carries another 'microswitch which is actuated by a cam on the shaft of the rotatable plug.