Patent GB-158937-A (GB)
Title: Improvements in means or instruments for use in surveying bore holes and the like
IPC: E21B47/022
Filed: 1919-10-13
Abstract: 158,937. Gallagher, W. Oct. 13, 1919. Bore-hole clinometers.-Relates particularly to instruments in which a pendulum device and a compass are mounted in an eccentrically-weighted carrier which is pivoted at its ends in an outer casing, and mainly comprises clockwork-actuated means for controlling the pendulum and compass. The container 2 carrying the pendulum 77, compass 133, and controlling-means is provided at its ends with pivots 3, 4 engaging in bearings in an outer casing (not shown), the lower bearing being preferably an adjustable foot-step bearing. The pendulum and compass pivots are at right-angles to the axis 3, 4. The upper portion of the container is cut away and is covered by a plate 17 provided with observation apertures &c. The controlling-means comprise an escapement 36 connected by a train of gearing to the mainspring barrel 43 whch gears with a pinion 45 on a spindle 46 having a squared portion on which is a pinion 47, a friction disc 48 being interposed between the pinions 45, 47 so that the pinion 47 can be turned without affecting the mainspring. The pinion 47 gears with a pinion 52, the spindle of which carries the pointer 53 moving over the dial 56, which is graduated anti-clockwise to indicate the time which must elapse before the pointer comes to zero. A cam-plate 97 pivoted on a stud 98 carries pins 102, 103 engaging the outer sides of horn-shaped extremities of arms 87, 88 which are arranged in proximity to the pendulum 77 and are pivoted at 89 and 90. On the inner sides the said extremities are engaged by pins 104, 105, also carried by the plate 97. The plate has a slot 115 provided with three notches which are adapted to be engaged by a projection 114 on an arm 110 pivoted at 111 and adapted to be engaged by a projection 113 on the pinion 52. A spring 106 connected by a wire 107 to a pin 108 tends to turn the plate 97. The means for controlling the compass comprise a bell-crank lever 122 shaped at. 124 for actuation by the plate 97 and connected by a rod 128 to a bell-crank lever 129 pivoted at 130 in proximity to the compass. The outer end of the lever 129 is adapted to engage a further bell-crank lever 131, Fig. 10, which is pivoted at 132 to the compass box and passes around the compass point 116. The compass needle 135 carries a boss 136 which is normally pressed against the cover 141 by a spring 150 to lock the needle but is pulled downwards to free the needle when the lever 131 is pressed towards the bowl by the lever 129. The lever 122 and arm 110 are connected by a tension spring 126. When the projection 114 is in engagement with the first notch in the slot 115, as shown in Fig. 2, the pendulum 77 and the compass box 133 are both free and the compass needle is clamped by the spring 150. When the projection reaches the second notch, as shown in Fig. 6, the compass box is clamped by the lever 131 and the needle and pendulum are both free. In the third position, the pendulum and needle are both clamped and the compass box is released. The plate 97 may be re-set by a pin 155 projecting through the cover 17.