Patent GB-190907228-A (GB)
Title: Improvements in or relating to Coin-operated Weighing-machines.
Inventor: MILLS HERBERT STEPHEN
IPC: G07F17/04
Filed: 1909-03-25
Granted: 1909-12-31
Abstract: 7228. Mills, H. S. March 31, 1908, [Convention date]. Steelyard apparatus.-Relates to weighing- apparatus comprising a platform scale of the ordinary type connected at 32.to a double-armed steelyard 24, 25 with sliding weights 26, 27, prepayment being' necessary to unlock the mechanism and enable the weights to be moved. A shaft 41, having been freed by prepayment, is rotated by the dropping of side. arms 40 and their connected parts until flat cam-portions 42, on which the side arms bear, are horizontal, as shown in Fig. 6. Simultaneously, a screen 100 is lowered in front of the scale, the screen being carried by a rod 98 which connects two similar series of links 95, 96, 97, 99, the links 95 being mounted. on the spindle 41. Rods 38, 39, mounted in the arms 40, carry sliding members 45 provided with forked arms 49, which are adapted to embrace pins 50 on the sliding weights 26, 27, and with projections 47, which, by the dropping of the arms 40, are brought into engagement with threaded rods 36, 37 mounted in the frame 20. These rods are now rotated by means of handles 53, 67, and the weights traversed until balance is obtained. To enable an accurate balance to be obtained. a spring device 55 automatically imparts a sufficient reverse rotation to the screwed spindle 36 or 37 when the handle is released to remove the fork 49 from actual contact with the corresponding pin 50. The device comprises spring- controlled jaws 61, 62, Fig. 13, which are pivoted to the hub of a loose disk 55'and carry pins 64 embracing the hub, and pins 65 embracing a pin 60 on the screwed spindle, so that, when the handle is rotated, the pin 60 first separates the jaws against the action of the spring 63, and then rotates the disk against the action of a spring clutch 68, the spring 63, when the handle is released, returning the jaws and rotating the pin 60 and the screwed spindle in the reverse direction. Balance having been obtained, the plunger 104, Fig. 6, must be thrust in to raise the screen 100 from the scale, the arms 40 being simultaneously raised and the parts restored to the inoperative, position. On pressing in the plunger, it is caused to engage a pin. 119 on a lever 118 pivoted at 117 to a spring-controlled arm 110 which is loose on the spindle 41, thereby turning the lever 118 until it bears against the hub of the arm 110, which is itself then turned against the action of a spring 113; a second lever 120, Fig. 2, pivoted to the arm and controlled by a spring 122 then snaps behind a projection 123 on the shaft 41, and a pin 116 on the arm 110 works along and finally drops behind a cam lever 106. When released, the plunger 104 is returned by a spring 103, a pin 109 tripping the lever 106 and permitting the spring 113 to restore the arm 110, the lever 120 rotates the shaft 41, thereby raising the arms 40 and screen 100 to expose the scale and restore the parts to the inoperative position, the shaft 41 being retained in position by the engagement of a lever 70 with a stop 41<1>.