Patent GB-151318-A (GB)
Title: Earth-boring machine
IPC: E21B7/02
Filed: 1919-06-02
Abstract: 151,318. Forrester, H. J. C., (International Earth-Boring Machine Co.). June 2, 1919. Bore-hole apparatus; ground augers. -.A machine for boring holes for telegraph poles, or for receiving concrete foundation piers &c., comprises a rotary boring-mechanism E, Fig. 1, carried by a turntable 59 mounted on a motorvehicle B, the motor being mounted independently of the turntable and adapted alternatively to propel the vehicle and to operate the boring-mechanism, or to be disconnected from both propelling and boring mechanism. The boring-tool consists of an auger 110, the shaft of which is mounted so as to slide longitudinally in a tower 100 pivoted at its lower end to the turntable and adjustable as to its inclination by screw arms 134 pivoted at their lower ends to the turntable and engaging with nuts 138, 140, Fig. 6, mounted on the tower. The nuts are formed integrally with bevel-wheels 139, 141 which are rotated through bevel-wheels 144 - - 147 by a shaft 148 operated by a handwheel 153, Fig. 3. The adjustability of the tower enables a hole to be bored at any desired angle and also enables the weight of the tower to be brought over the body part of the vehicle to facilitate transport. The tower is stiffened by lateral braces 128 mounted on pivots in alinement with those on which the tower itself is mounted. The boring-mechanism is driven from a shaft 30 which is in turn driven by a shaft 27 extending through the centre of the turntable. the shaft 27 being driven by a chain 17 and shafting 20 from a shaft 16 projecting from the gear case 13 of the motor-vehicle, the motor being disconnected from the vehicle driving-gear and connected to the shaft 16 by a lever 16'. On the end of the shaft 30 are fixed mitre gears 65, 66, Fig. 5, the former effecting the rotation and also the lowering of the boring mechanism, and the latter the raising thereof. The mitre wheel 65 gears with another mitre wheel 71 which is keyed to a shaft 67 upon which is loosely mounted a sprocket-wheel 84 having a clutch member 85 adapted to engage with a clutch 86 keyed to the shaft 67. The chain 87 drives a sprocket-wheel on a shaft 119, Fig. 3, which rotates the boring shaft through bevel-gearing 120. The mitrewheel 66 drives a mitre-wheel 76 loosely mounted on a sleeve 73 which is in turn loosely mounted on the shaft 67, and which carries at its outer end a sprocket-wheel 78. Loosely mounted on the sleeve is also a mitre-wheel 72 gearing with mitre-wheel 65. The wheels 76, 72 are provided with clutch members 77, 74 adapted to engage with a clutch 75 mounted to slide on but to rotate with the sleeve 73. The chain 79 is thus driven in one direction or the opposite according as the clutch 75 is in gear with the wheels 76, 72 respectively. The chain 79 drives a sprocket-wheel loosely mounted on the shaft 119 and carrying another sprocket-wheel by means of which is driven a sprocket-wheel 123 mounted on a shaft 121. The shaft 122 carries another sprocket wheel 125 from which a chain 126 passes to a similar wheel 114 mounted in adjustable bearings at the top of the tower. The chain 126 is connected to a rectangular member 115 which slides in the tower and to which is rotatably secured the boring- shaft 107. The boring-apparatus is therefore raised or lowered according as the clutch 75 gears with the wheels 76, 72 respectively. The turntable is mounted in ball bearings 50, 51 in a framework C fixed to the bodv of the vehicle, and is secured in any desired position by pins 46 which fit in a series of holes in the framework C.