Patent GB-430997-A (GB)
Title: Improvements in and relating to power transmission mechanism
IPC: G05G13/00
Filed: 1934-01-08
Abstract: 430,997. Controlling change speed epicyclic gearing ; friction clutches. HENRIOD, C. E., Areuse, Neuchatel, Switzerland. Jan. 8, 1934, No. 635. Convention date, Jan. 10, 1933. [Class 80 (ii)] Epicyclic change-speed and reversing gearing is controlled by a cam-shaft 16, Figs. 1 and 2, which is turned stepwise in both directions to change up from reverse to solid drive by turning one way, and down back to reverse by turning the other way. There are two steps to each change with a neutral between. There is a ratchet and pawl 24, 24<2>, Fig. 4, for turning one way, and another ratchet and pawl 25, 25<2> for the other way, each ratchet tooth corresponding to a step. The pawl levers 241, 251 may be actuated mechanically as by a pedal to each, or by a suitable fluid control. In the preferred arrangement shown, the pawl levers are operated by solenoids 24<5>, 25<5> which are energized alternatively by depressing switch buttons 39, 40, Fig. 3, there being a battery at 43, Fig. 1, with connections 38. The cam-shaft 16 is geared at 26, 27 and through a tube 30 to a pointer 33, Fig. 3, moving over a dial. Each depression of one of the buttons 39, 40 thus moves the pointer 33 half the distance between one gear position and the next. The gearing comprises clusters of stepped planet gears supported freely in cavities in a hollow driving- element 1, 54, Fig. 1, as described in Specification 368,055. The ratios are effected by tightening alternatively brake bands 51, 5<2>, 5<3> and a clutch band 5. The bands 5, 5<1> are both shown in Fig. 2, the former being the smaller. The brake bands are similar and non-rotary, and each is applied when a cam 21, 22, or 23 imparts a small leftward displacement to a lever 45, there being one such lever to each brake. The clutch band 5 is rotary and is secured to the flywheel 1 by a hinge bolt 6. The ends of the clutch band 5 are connected by links 7 to a toggle 10 which is displaced to engage and disengage the band while rotating. The toggle 10 has arms 11, 12 extending laterally in the different planes of two cams 18, 19, Fig. 1, on the shaft 16. Fig. 8 shows the toggle arm 12 approaching the turned down cam 19 with the clutch band open. The arm 12 is depressed by the cam 19 far enough for a cam spring plunger 48 to slip out of a notch 47 in the toggle and complete the movement bringing the parts to the position of Fig. 7 with the band 5 closed on its drum 4 and the arm 12 out of reach of its cam 19. In Fig. 7, the cam 18 is shown turned down to open the clutch band. The toggle arm 11 is depressed as it passes under the cam 18 and the displacement of the toggle back to the position of Fig. 8 is completed by the spring cam 48. The raised arm 12 passes clear to one side of the depressed cam 18. The Specification as open to inspection under Sect. 91 describes also a stop for limiting the rotation of the cam shaft 16 in both directions. The application of the control device to changespeed gearing of any type is also contemplated, the conventional sliding-gear type being mentioned. This subject-matter does not appear in the Specification as accepted.