Патент USA US2106041код для вставки
Jan.'18, 1938. ‘ F. scl-léaEL El‘ AL 2,106,041 MECHANICAL MpTIos- TRANSMITTING DEVICE Filbd- March 3, 1937 Inventor's-z‘ 4 Fritz Schébel, ' I Paul Schubert‘, Their" Attorney. 2,16,41 Patented Jan. 18, 1938 UNITED STATES PATENT OFFHE 2,106,041 MECHANICAL MOTION TRANSMITTING DEVICE Fritz Schiibel, Berlin-Pankow, and Paul Schubert, Berlin-Karlshorst, Germany, assignors to Gen eral Electric Company, a. corporation of New York Application March 3, 1937, Serial No. 128,842 In Germany March 10, 1936 5 Claims. (01. 74-100) Our invention relates to mechanical motion transmitting devices, and more particularly to motion transmitting devices of the slotted crank type. One object of our invention is to provide an improved slotted crank capable of moving into each of two extreme positions with a snap action. Another object of our invention is to provide improved operating mechanisms for valves used 10 in gas meters. ' Our invention will be better understood, and other and further objects of our invention will be apparent by reference to the following de scription when taken in connection with the ac 15 companying drawing, and its scope will be pointed out in the appended claims. In the .accompanying drawing, Fig. 1 discloses in perspective, a front elevation of our improved motion transmitting device as applied to a gas 20 meter, and Fig. 2 is an end view partly in cross section of the operating arm, or crank, illustrated in‘ its two extreme positions. Referring to the drawing in detail, Fig. 1 illus trates a valve housing 5 of a gas meter such as is 25 disclosed in U. S. Patent 1,878,344 issued Sep tember 20, 1932, divided by a wall 6 into two chambers 'I and 8, each of which contains an opening controlled by a valve. The valves 9 and II], respectively, controlling these openings, are 3O arranged in such manner that when one of the auxiliary chambers is closed, the other is opened. In Fig. 1, the valve 9 is illustrated as being open, and the valve In is shown as being closed, their respective stems II and I2 being arranged to 35 move horizontally, in any suitable guides (not shown), are connected by a crossrod I3, upon which is mounted a spool I4. The spool I4 is loosely mounted on the cross rod I3, and is en gaged by our improved device. 40 The motion transmitting device built in ac cordance with our invention comprises a crank I5 mounted at one end on an operating shaft I6, and provided at the other end with a pair of parallel rods I1 and I8 extending at right angles to the 45 crank I5 and upwardly between the ?anges, and on opposite sides of the body of the spool I4. The parallel rods I1 and I8 are preferably made of a single length of metal wire, preferably of such metal as bronze or spring steel, bent into the 50 shape of a hair-pin and supported at the apex by a collar I9 formed at the end of the crank I5 by ears 2D and 2| which are bent about the rods I1 and I8 to rigidly hold them in position. A kink 22 in the rod I‘I near the apex enables the ear 20 to better grip the rod 11. The rod I8 is. 55 straight, and rod I1 is provided with a second kink 23 near its upper end, projecting inwardly, and providing a short narrowed space between the rods I‘! and I8. The operating crank being mounted upon the shaft I6, moves the parallel , rods I1 and I8 in an arcuate path, thereby pro ducing a horizontal movement of the spool I4 and the valve mechanism connected thereto, and a vertical movement of the kink 23 relatively to the spool; the kink 23 being above the spool in 10 one operating position of the valves and below the spool in the second operating position. The mechanism for turning the shaft I6 is not shown, since it forms no part of our present invention. Our improved device is, however, specially adapt ed for use in gas meters of the type disclosed in the above-mentioned Strelow patent, and the mechanism therein disclosed can be adapted to rotate the shaft I6. The position of the crank in the two operating, or end, positions is better 20 illustrated in Fig. 2. > _ Referring to Fig. 2, the shaft I6, together with the operating crank I5 and the parallel rods I1 and I8, are shown in full lines in the same posi tion as in Fig. 1. The second position of the 25 rods I1 and I8 is shown in dotted lines. In this second position of the rods I1 and I8, the connect ing rod I3 has been moved inwardly to close the valve 9 and to open the valve Ill. The kink 23 in the rod I1 is clearly visible in both positions, 30 above and below the spool body I4. In order to move between these positions in response to the movement of the crank I5 and a rotation of the shaft I6, the rod I1 is bent back so that the apex of the kink may pass over the cylindrical surface of the spool body. Since both the rod I1 and the rod I8 are made of bronze, or spring steel, the force required to move the spool past the kink is distributed between the two arms I‘! and I8, and they are both bent outwardly, and both tend to 40 return to their respective normal positions. Therefore, when the apex of the kink 23 passes over the cylindrical surface of the spool body, an unstable condition is created and the resil iency of the rods tends to force the spool above, 45 or below the kink 23. This action necessitates a slightly greater torque at the beginning of a movement of the crank I5, but provides an addi tional force at the end of such movement which tends to drive the valves into their respective 50 positions. In this manner, therefore, a simple over-center device is provided for moving the valves into either of the two extreme positions with a snap action, and thereby eliminating a chattering or ?uttering of the valves during these 55 2 2,106,041 operations. On the other hand, a positive force is required to initiate an operation thereof. The above-described motion transmitting de vice, although described as applied to the valves provided with a spool having its axis substan tially at right angles to said stem, a crank for operating said valve comprising a pair of spaced parallel and resilient arms engaging said spool and the operating shaft of a gas meter, com pn'ses a simple and inexpensive, yet rugged over on opposite sides of its axis, and a tapered pro jection on one of said arms projecting toward center device capable of application to other mechanisms. What we claim as new and desire to secure by 10 Letters Patent of the United States, is: 1. In a mechanical motion transmitting device, the combination of an operated member provided the other of said arms, said spool being moved past said projection during each operating move ment of said valve whereby an unstable condition exists in any position of said valve except the 10 open and closed positions thereof. 4. In a dry gas meter, the combination of a set of valves, a pair of valve stems arranged to operate said valves to opened and closed posi with a cylindrical surface and arranged to move in a straight line between two end positions, an 15 operating member including a crank provided with a pair of resilient members adjacent oppo site sides of said cylindrical surface and arranged to move transversely of said operated member during its linear movement, and a tapered pro 20 jection on one of said resilient members arranged to move past said operated member during said transverse movement to force apart said spaced members thereby creating an unstable condition between the two end positions of said operated 25 member. 2. In a mechanical motion transmitting device, snap action is obtained at the end of each move the combination of an operating crank including a pair of spaced resilient members, an operated member between said spaced members provided 30 with a spool extending substantially between said ment tending to quickly seat the valves in either direction of movement. 5. In a mechanical motion transmitting device, the combination of an operated member arranged 30 two resilient members, a tapered projection on one of said parallel spaced members and project ing towards the other of said members thereby providing a reduced spacing between said spaced 35 members, and means for moving said crank whereby said operated member is moved linearly and said tapered projection is moved transversely of said spool an unstable condition being created until said projection has moved past said spool. 40 3. In a dry gas meter, the combination of a valve, an operating stem therefor operable in a straight line to open and close said valve and tions respectively, a cross bar provided with a spool connecting said valve stems for simulta neous operation, a crank for moving said cross bar comprising a pair of spaced resilient arms engaging said spool on opposite sides of its axis, a tapered projection on one of said arms pro- - jecting toward the other of said arms said pro jection being moved transversely of said spool during each operating movement of said crank whereby an unstable condition is created until said projection moves past the said spool and a to move in a straight line and provided with a cylindrical surface, a slotted crank engaging said surface on opposite sides thereof, a tapered mem ber projecting into said slot, resilient means for holding said member in the said slot, and means .' for turning said crank whereby said projecting member is moved transversely of said cylindrical surface and provides a snap-action at the end of the movement of the said operated member. FRITZ scHCiBEL. PAUL SCHUBERT.