Patent GB-650037-A (GB)
Title: Improvements in or relating to controlling and driving mechanism for cranes and liketraction machines
IPC: B66D5/00
Filed: 1947-07-09
Abstract: 650,037. Operating clutches. KOEHRING CO. July 9, 1947, No. 18176. Convention date, Oct. 27, 1941. [Class 80(ii)] [Also in Groups XXXI and XXXIV] In a steering and driving mechanism for cranes or like vehicles a clutch and brake unit is provided in the drive to each traction member and comprises a drum, a movable clutch member and a brake member each co-operating the drum, an actuating mechanism for each unit for releasing the brake and engaging the clutch and vice versa and a spring being provided between the actuating mechanism and the clutch member for permitting application of the brake while the clutch is engaged, or while the clutch disengagement is delayed, until the driving torque has been reduced for the frictional interengagement between the clutch member and the drum to be overcome by the spring. As shown a drive shaft 17 carries a bevel gear 5 meshing with a bevel gear 6 on a shaft 2 within a casing 4. Splined on each end of the shaft 2 is the slidable clutch member 89 having jaw teeth 91. Each clutch member 89 is adapted to engage the drum 54 by the teeth 91 entering openings 53. Each drum 54 is rotatably mounted on the shaft 2 and has a gear 54a, Fig. 7, engaging a traction member. Each drum 54 is controlled by the brake band 51 formed in two halves. Each brake and clutch unit is separately controlled from concentric shafts 15, 16 freely mounted in the shaft 17. Each shaft 15, 16 carries a grooved member 23, 22 operated by a yoke member 18, 19 for axial displacement relative to the shaft 17. The shaft 15 pivotally carries a yoked member 9 which is secured to a shaft 13 pivotally mounted on the casing 4, while the shaft 16 is pivoted to a member 10 which is likewise secured to a shaft 14 pivotally mounted on the casing. In each unit there is secured to the shaft 13 or 14 a yoked arm 30. Carried within a slot in the yoke is a pin 40 to which is secured an additional yoke member 37 having an extension 38 to which is secured a compression spring 39 engaging the arm 30. Secured to the pin 40 is an arm 46 mounted on an actuation shaft 32. At the other end of the'shaft 32 is a brake arm 49, Fig. 3, controlling a rod for operating the brake band halves (see Group XXXIV). Also secured to the shaft 32 is a clutch arm 95 is pivoted a yoke 80 having a bearing 96 for a screw 97 carrying the compression spring 99 acting between the bearing 96 and one end of the screw 97. The other end of the screw 97 is pivoted at 86 to an L-shaped lever 81 which is pivoted at 84 to the vehicle frame. The arm of the lever 8 1is forked at 88 and engages lugs 92 on a clutch shifting ring 92a rotatably mounted of the clutch member 89. Operation. - With the left hand brake and clutch unit in its position shown in Fig. 1 the clutch can be disengaged and the brake applied by downward movement of the shaft 16. Downward movement of the shaft 16 causes clockwise rotation of the member 10, the arm 30 and the shaft 14 as seen in Fig. 2, and subsequently causing counter clockwise rotation of the actuation shaft 32. This rotation of the shaft 32 causes application of the brake halves to the brake drum 54 and retardation of the same. The rotation of the shaft 32 causes likewise rotation of the brake arm 95. Whilst power is being transmitted through the clutch, the frictional resistance between the teeth 91 and the apertures 53 may overcome the spring 99 during the rotation of the brake arm 95 and the spring 99 becomes compressed. Thus until the driving torque is reduced sufficiently by the braking action, the clutch remains engaged. On sufficient reduction of the frictional resistance between the teeth 91 and apertures 53, the spring 99 rotates the lever 81 in a clockwise direction about the pin 84, Fig. 1, which movement causes movement to the right of the clutch member 89 and disengagement of the clutch. Subsequent upward movement of the shaft 16 causes the process to be reversed, the brake band halves 51 expanded and the clutch engaged, the bearing 96 actuating the lever 81 directly. U.S.A. Specification 1,947,823 is referred to.