Patent GB-190416095-A (GB)
Title: Improvements in and relating to Strength and Lung Testing Apparatus
Inventor: MAITLAND JOHN
Filed: 1904-07-20
Granted: 1904-10-13
Abstract: 16,095. Maitland, J. July 20. Dynamometers ; pressure gauges.- Strength and lung testers are described i n which a coin is inserted and afterwards forced by a plunger to release detents and allow the machine to be used in one of several ways, any one of which restores the detents and releases the coin. A pressure gauge is described in connection with the lung - tester. The strength-testing machine, Fig. 1, has a pad 5 for receiving blows, two handles 13, 14 for testing the grip, another 120 for testing pulling-strength, two fixed handles 123, one on either side, by means of which and the pad the strength of the arms and chest may be ascertained, and two fixed handles 124 similarly used for the arms and back. The pad 5, Fig. 2, is mounted on a plunger 3, which passes through a bearing in the framing 9, 10 and has a collar 11, between which and the back of the frame is compressed a spring 6. Arms 8 on the collar are normally locked by pawls 12, and the plunger is cored to receive a central guiding-piece also fast to the back of the frame. Of the grip-handles, the movable one 14 is attached to a polygonal plunger 15 which passes through the collar 16 and receives a fixed central guiding-rod 19. When the detent 26 is thrown out of gear with the nose 22, the motion of the latter when the handles are gripped will rock the lever 23 and pull the cord 24, which is attached to and draws down a rack-bar gearing with the pinion 33 on the spindle' 30 carrying the indicating-hand 32. The rack is returned by a cord pissing over a pulley at the top of the casing, and attached to the weight 48, and near the extremity of the motion of the rack this weight compresses a spring to accelerate the return. A ratchet on the back of the rack cooperates with two spring-pressed pawls to maintain the indication until the pawls are withdrawn by a suitable push-lever. The cord 24 passes over a pulley 37 on the collar. 11, which is moved bodily when a blow is struck, and beirs against the stop 36 upon the cord to operate the index. Fig. 3 shows a coin which has been dropped down the slit 56 and pressed by the plunger 74 so that it forces out and remains caught under the flat part 107 of the releasing-limb 58, which is pivoted at 59 and lifts the cross-bar 61 and connections 63, 69, wheieby the detents 26, 12 are lifted. The arrangement of the pull-tester is identical with that of the grip-tester. In the position shown, the coin is supported by a plate or coin-arrester 75 carried by a lever which is normally held against an adjustable stop by a spring ; but, as the spindle 30 revolves, a cam thereon displaces the lever and arrester, allowing the coin to drop and the detents to return to normal position. In a modification, the cord 24 is attached to the arm 37, and motion is transferred by a lever from the grip-tester to the collar 11. Fig. 7 shows a machine for testing lifting- power and for measuring the maximum pressure of air in the lungs, arranged in a similar manner to the above machine. The air-pressure machine comprises an extensible-bag form of pressure gauge. The handle 118 is attached to a. plunger, the rise of which is opposed by a spring, and the cord 24 is fixed to the lower end of a rack-bar to indicate as before. The detent 123 forms one arm of a bent lever pivoted at 124, the other arm 125 of which is attached by the cord 126 to the cross-bar 61 actuated by the coin. Upon the cross-bar also is an arm 146, Fig. 15, with a lug engaging the cam-projection 145 on the swinging arm 143, whereby the latter is moved from the position shown in full lines to that shown in dotted lines in Fig. 10, and allows the pin 141 to slip over its curved surface. In this way, the coin frees a cross-bar 132, which is depressed against springs when air is blown through an armoured tube into a bag within the casing 131, the coinarrester being operated as before. A cord from this cross-bar passing round a pulley loose upon the spindle 30 turns a second index arm, and there are bells 153, 154, worked by the contacts 151, 150 and the lug and hammer 156, 155 respectively.