Patent GB-190215279-A (GB)
Title: Improvements in Multiple-speed Gearing, and in Clutch and Brake Mechanism therefor.
Inventor: HEATLY HARRY
Filed: 1902-07-09
Granted: 1903-05-28
Abstract: 15,279. Heatly, H., and Hunt, W. July 9. Motor road vehicles.-Relates to variable-speed gearing and mechanism connected therewith, and is especially applicable to gearing of the type described in Specification No. 3874, A.D. 1902, [Abridgment Class Mechanism &c.]. On the driving-shaft 1, Fig. 3, is fixed a pinion 2, and on the driven sleeve 3, which encircles the shaft 1, is fixed a pinion 4. One or more sleeves 6 encircle the sleeve 3, and each of these sleeves is provided with a pinion 8 and a brake drum 10. The pinions 2, 4, and 8 gear with a series of pinions 13, 14, 16 fixed together and mounted on pins 12 secured in a casing 11. This casing is provided with a brake drum 17. The pinions may be carried by brackets free to rotate with the pinions, and provided with a brake drum ; the gearing may be mounted within a fixed casing. When a brake is applied to the drum 17 so as to nx the casing 11, motion is transmitted to the sleeve 3 from the shaft 1 through the pinions 2, 13, 14, 4. When a brake is applied to the drum 10 so as to fix the pinion 8, the pinions and casing 11 form an epicyclic train, and the sleeve 3 is driven at a different speed. By fixing any two elements of the gearing, the driving and driven shafts are connected so that they revolve at the same speed. As shown in Fig. 3, a clutch is provided for coupling together the shaft 1 and sleeve 3, the clutch mechanism being arranged to work in connection with the braking-mechanism. The brake strap is made in two parts 18, 19, Figs. 3 and 5, hinged together at one end, and pressed together at the other end, so as to apply the brake, by means of a spring encircling a bolt 27 passing through brackets on the parts. One of the brackets 21 is carried on a shaft 22, which is capable of endwise movement, or the bracket may move endwise on the shaft. The bracket is connected by a link 23 and crank 24 to a shaft so that, upon rotating the shaft by means of a handle working over a notched quadrant &c., the bracket may be moved so as to bring the brake strap over any of the drums as required. The brake strap is opened to release the brake by means of toggle-levers &c. pivoted to the parts 18, 19, and connected to a lever 33 on the shaft 22. This lever may be connected directly with the operating-device, or it may be pivoted with a quadrant having a series of holes and adapted to register with another perforated quadrant on a lever 35 connected to the operating- device ; the relative position of the levers 33, 35 can be adapted by bringing suitable holes into register and passing a bolt therethrough. The lever 35 is connected to an operating-lever 38, Fig. 6, by means of a rod 39. In order to maintain the brake strap free from the drum, a spring- controlled pawl 43 on the lever 38 is adapted to engage a toothed quadrant 44 on the lever support. The pawl is released by means of a handle 46 or a pedal lever 40. The clutch 47 for connecting the shaft and sleeve is operated by a bell-crank lever 49, the free end of which has a notch &c. 52 to receive the lever 35 when the brake mechanism is moved over clear of the drums 17, 10. In this position, the brake strap is arranged to engage an idle drum 53, or a fixed bracket or pin. When the pedal 38 is released, the lever 35 is moved by the brake spring and operates the lever 49 so as to throw the clutch into gear. In order to ensure the proper action of the clutch and brake mechanisms, a pin 54 on the brake strap is arranged to engage a slot 55, 56 in the lever 49, so that the clutch cannot be operated until the brake mechanism is moved clear of the drums. The pin may be mounted on the lever and the slots formed in the brake strap, or a flange or rib engaging a pin or roller, or other equivalent device may be employed to interlock the clutch and brake mechanisms. The clutch may be operated independently of the braking mechanism, or may be employed in connection with other forms of laterally-moving brakes. According to the Provisional Specification, a separate brake may be used in connection with each brake drum.