Patent GB-684423-A (GB)
Title: A material handling machine
IPC: B66F9/19
Filed: 1950-04-07
Abstract: 684,423. Load-handling machines; winding apparatus. WAGNER, H. A., WAGNER, G. H., and WAGNER, E. A. April 17, 1950. No. 9408/50. Classes 78 (iii) and 78 (v). A load-handling machine comprises a ververtical, or substantially vertical, member, a carriage movable along this member and raised and lowered by a cable, a load carrier pivoted to the carriage in offset relation so that it is movable to a dumping or scooping position by gravity, guides on the carriage about which the cable is passed, means for clamping one end of the cable to the load carrier at a point spaced from the pivotal mounting whereby slackening said cable when the carriage is stopped causes movement of the load carrier to scooping or dumping position and tightening of the cable first causes raising of the load carrier to the carrying position and thereafter causes it to travel upwards along the vertical member, and means for stopping the carriage at any desired point, this means including a second cable attached to the carriage. The vertical member 25, Fig. 1, is composed of spaced angle bars and comprises an upper pair 27 and a lower pair 26 pivotally connected at 28. When the braces 30 are removed, the pair 27 may be lowered on to the top of the driver's cab 29. The carriage 33 has flanged guide wheels 34, 35 engaging opposite sides of the angle bars and comprises spaced side plates 40, Fig. 3, between which a plate 41 extends horizontally. A scoop 43 is pivoted at 42 to the plates 40 and is secured by a clamp 56 on its rear wall to the hoisting cable 55. This cable passes over a pulley 45 mounted on the plate 41, down to and around a pulley 48, up to and over a pulley 49 mounted on top of the member 25 and down to a winding drum 60, Fig. 4. This drum is fast on a shaft 61 which is connected by chain-and-sprocket gearing 64 to a shaft 66, Fig. 5, driven by a worm gearing from a shaft 68. The shaft 68 is connected by a universal joint 69 to a shaft 70 mounted in a bearing 71 and carrying a grooved collar 72 which is engaged by the pins of a shifting yoke 73. The arms 75, 76 of a toggle device are pivotally connected to the yoke 73 and bearing 71, respectively, and the toggle lever 77 is attached to one arm of a bellcrank lever 78, the other arm of which is connected to a control rod 79, Fig. 6. A spring 80 tends to maintain tile toggle broken. A cone clutch member 85 on the end of the shaft 70 engages a conical cavity in a plural sheaved pulley 86 which is loose on the shaft 70 and is connected bv V-belts 87 to a pulley on the engine crankshaft. The rod 79 is pivoted to a lever 90, Fig. 7, which carries an adjustable abutment screw 93 in alignment with a member 94 mounted on the end of a lever 95. This lever is welded to the vertical leg 96 of a U-shaped rod which is journalled in bearings on a braket 98 fixed to the machine. A spring 99, which connects the bar 95 to a bracket on the machine, urges the member 94 towards the screw 93 and causes the leg 97 of the U-shaped rod to take up the position shown in Fig. 5. In this position the brake band 101 is applied to the drum 102 on the shaft 68 since the leg 97 is attached to the end of the brake band. When the clutch is disengaged and the brake 101 loosened, the carriage can be lowered at a rate controlled by the brake until it engages the crossbar 109, Fig. 3, at the bottom of the guides. A bar 103 pivoted near the top of the guides is connected to a cable 106 which passes round a pulley 107 and is secured to the lever 90. A lug 112 on the lever 90, Fig. 7, engages a lever 113 which carries an adjustable abutment 114 in alignment with the member 94. When the carriage engages the bar 103, the lever 90 is moved forwards to disengage the clutch cone 85 and apply the brake. the lever is pulled back by hand to engage the clutch, the screw 114 engages the member 94 and causes the release of the brake. If the lever 90 is pushed in the opposite direction from its central position, the clutch is disengaged and the brake released owing to the engagement of the member 94 by the screw 93. Springs 80, 99 are selected so that the lever 90 is held normally in intermediate position with the clutch disengaged and the brake on. A brake drum 130 on the shaft 61 is engaged by a band 129, the free end of which is adjustably connected to a rod 128. This rod is pivoted to a short arm 127 on a shaft 126, a longer arm 125 on which is pivoted to a toggle arm 123. The other arm 124 of the toggle is pivoted to the chassis and the toggle lever 122 is pivoted to a lever 120. A spring 132 connects the arm 125 to the machine. The brake drum 130 is fastened to a divides drun 138 on which are wound cables 135, 140 in opposite directions. These cables are attached to the carriage 33 which can be stopped at any position in the guides by applying the brake 129. Since the vehicle when. heavily loaded would travel relatively slowly under its own power, a free-wheeling device is provided in each driving wheel in order that it can be towed at a relatively higher speed. This device is an epicyclic gear, the planet carrier of which can be locked by an arm detachably connected to the chassis.