Patent GB-558167-A (GB)
Title: Improvements in or relating to regulating devices for timepieces
IPC: G04D7/10
Filed: 1942-06-19
Abstract: 558,167. Regulating time-pieces. KOHLHAGEN, W. June 19, 1942, No. 8471. [Class 139] A device for regulating timepieces having a movable regulator comprises a holder with releasable means for retaining the movement, beat-frequency pick-up means associated with the holder, and regulator engaging means carried on the holder to releasably engage the regulator. A cylindrical body member 20 has a head 21, the shoulder 22 of which seats on a supporting ring 23 in which the body member 20 may rotate, a retaining ring 24 being secured by a set-screw 25. The supporting ring 23 has radial pivot pins 26, 27 mounted in bearing posts 28, 29 rising from a base 30. A hand-wheel 32 fitted to pin 27 enables the body to be rotated about the horizontal axis of the pins 26, 27. Mounted upon the head 21 is a cover plate 33 rigidly secured to it by screws, and carrying a bracket 35 in which is pivoted a movement-retaining lever 37. A movementpositioning plate 46 is secured to the cover plate 33 and provided with a cavity 48 shaped to receive the back plate of the movement 42. The nose 40 of the lever 37 is drawn down to engage the centre arbor 41 of the movement by a spring 50 and released by pressing down the finger piece 39. A regulating lever 52 pivoting on the head 21 is secured intermediate its ends to a shaft 53 the lower end of which bears in a socket of the head 21 and the upper end in a hole in the cover plate 33 in line with the socket. Mounted to reciprocate longitudinally on the lever 52 is a cam actuating bar 61 which is slotted at 63, 66 to form guides on screws 65, 67. The annular enlarged portions 72 of the shaft 53 has bearing upon its upper surface the lower cam 73 of two cams 73, 74 pivoted on the shaft 53. Each cam is formed with an arcuate surface. Adjacent the shaft 53, the cams are provided with upwardly extending clamping fingers 79, 80, the upper cam being cut away to allow movement of the pin 79. The fingers extend upwardly through an arcuate slot in the plate 33 and through an arcuate slot in the rear movement plate 44 to engage each side of the regulating arm of the timepiece. The cams 73, 74 are secured by springs 89 to a pin 90 extending upwards from the cam-actuating bar 61 the springs tending to close the fingers 79, 80. They are opened by a finger 91 extending upward from the bar 61 to engage the arcuate surface of the cams. when the bar 61 is moved from the Fig. 4 position, the pin or finger 91 opens the fingers 79, 80 against the tension of the springs 89. The pin 90 has also secured to it one end of a spring 92 secured at the other end to a pin 93 extending upwards from the lever 52. Guided in a groove 60 in the underside of the cover plate 33 is a slide 94 having a clearance opening 99 for the shaft 53 and cams. The outer edge has a finger 100 which is engaged by a lever 101, when this is swung by rocking of lever 37, so as to move the slide 94 against the influence of springs 106. At the inner edge of the slide 94 are studs 103 which engage the edges 104 of the broad part of lever 61 to cause the bar 61 to be moved from the Fig. 4 position so that the pin 91 opens the cam fingers. The latter engage the regulator lever and this may be moved by turning lever 52. A rod 120 engaging the back plate at the other end has a head 122 in contact with a crystal microphone 115 located in the body 20. This is connected to an indicating device such as a cathode-ray tube by means of which the beat of the movement may be compared to a standard beatfrequency. The regulating lever 52 may be then moved to move in turn the regulator of the movement until the beat is synchronised with the standard. The part 20 may be rotated about it axis and about a horizontal axis to test in different positions.