Patent GB-265665-A (GB)
Title: A machine for trenching, excavating, quarrying, rivetting, stamping and like operations in which an impact tool is employed
IPC: E02F3/04
Filed: 1925-11-03
Abstract: 265,665. Motion, R. Nov. 3, 1926. Paviors, rammers, and road breakers.-A percussive machine for road-breaking, stamping, &c. comprises a tool spindle and elevating mechanism therefor supported by a framing, a spring which is compressed on elevation of the spindle and acts on a lever engaging the spindle, a trip device automatically releasing the spindle at the end of its upward movement, manually operable means for rendering the trip device ineffective, and a nut on the upper end of the spindle which serves as a stop to a shock-absorbing spring and carries a detachable weight. In Fig. 1, the machine frame comprises side plates 1 connected by crossmembers 3, 4, 5, one or more spindles 6 being slidable in the cross-members 4, 5 and each carrying impact tools. Each spindle 6 is pressed downwardly by an adjustable compression spring 7 acting through a pivoted lever 9, and is raised against the resistance of such spring by means of a crank shaft 24 acting through a connecting rod 47 and lever 49 to oscillate a latch arm 51, which latch arm, during its movement to the right, engages a pivoted roller-tappet arm 53 to rock the latter; the tappet arm 53 engages and rocks a pivoted cam lever 57, the free end of which works within a slot 6<11> in the spindle 6 and raises the latter until a roller 65 carried thereby engages a cam 67 on the latch arm to cause said latch arm to free the tappet lever 53, whereupon the spring 7 forces the spindle 6 downwardly. The spindle 6 carries a weight 18 and an adjustable nut 17 which co-operates with a spring 19 and leather, felt, and metal washers 21 to absorb shock. Similarly, the lever 57 is linked to a rod with an adjustable stop 62 which co-operates with shock-absorbing washers 63. A wire 82, controlled by a lever 119, Fig. 6, acts through a bell-crank lever 80, wire 78, a weighted lever 74 and links 71, 72 pivoted together and to the levers 74, 53 to move a roller 73 carried by the links into the path of the latch arm to prevent the latter operatively engaging the lever 53. The machine is slidably mounted in guides 83 in a chassis, and is suspended by ropes 85 passing over pulleys 86 to drums 87 driven by worm gearing 89, 90; the worm 90 is carried in a bracket 93 adjustable about the worm-wheel shaft and locked by a pin 94. The chassis is supported on central wheels 95 and front and rear wheels 97, 98, the latter being mounted on pivoted arms 99, 100, which may be adjusted to tilt the machine; reaction to the blows of the tools may then be used to move the machine. The chassis carries a prime mover 23 which, through chain gearing, drives a shaft 31; this shaft may, through interconnected clutches 36, 40, be coupled either to the crank shaft 24 to drive the tools, or through chain gearing 103, shaft 105, clutches 110, and chain gearing 108 to drive the chassis. The chassis may also be driven by hand through a chain 117 and sprocket 118 connected to the shaft 105 through a reversible ratchet. Brakes 112 are controlled by a handle 113. Specifications 167,790 and 209,784, [both in Class 124, Stone &c.], are referred to.