Nov. 28, 1950 B, GUYER 2,531,909
PIPE BORING MACHINE Filed May 2l, 1946 7.5: D i se "JIL Patented Nov. 28, 1950 UNITED lSTATES PATENT OFFICE PIPE BORING MACHINE Biada Guyer, Denver, Colo.
Application May 21, 194e, serial No. 671,363
3 claims. (Ci. 255-20) In laying ground pipe, more especially service connections to water and gas mains, it is customary to excavate at each extremity of the run and to bore between the excavations by forcing the pipe through the ground while simultaneously rotating it with a wrench. If necessary, water may be forced through the pipe to assist the boring. It is, however, exceedingly difficult to apply the necessary pressure on the pipe while rotating it with the usual pipe wrench.
This invention relates t'o what might be termed a pipe boring jack; that is, a device for gripping the pipe and forcing it into the earth 'ohja rotating spiral. x
The principal obj'e'ct'jof the invention is to provide a sturdy, easily portable pipe boring jack which can be readily handled in a small excavation; which 'can be used to force a pipe forwardly in a series of steps; and which will simultaneously rotate the pipe during each forcing step.
Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and eiiciency. These will become more apparent from the following description.
In the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.
In the drawing:
Fig. 1 is a plan view of the improved pipe forcing device;
Fig. 2 is a side view thereof;
Fig. 3 is a forward end View; and
Fig. 4 is a cross-section, taken on the line 4 4, Fig. 2.
The improved pipe boring jack comprises a substantially rectangular base frame It) having an upstanding front end member II and a similarly upstanding rear end member I2.
A pipe-receiving tube I3 is rotatably mounted in bearing members I4 on a sliding carriage I5. The carriage I5 is slidably supported on two parallel slide rods I8 extending horizontally between the end members Il and I2. A flange plate I'I is fixed to or formed on the tube I3 in spaced relation to the forward extremity thereof.
A ring gear I8 rotatably surrounds the latter extremity and rests against the flange plate I'I. A pair of stop pins I9 extend from the flange plate I1 through circumferentially slotted openings in the ring gear to allow a limited rotation of the latter. A pair of tangentially invrack 25.
clind ratchet dogs 2| are hinged at their outer extremities on hinge screws 22 in the face of the ring gear and extend through guide openings 32 in the forward extremity of the tube I3 into the interior thereof.
An operating handle 23 is mounted on a handle shaft 24 extending tra'sversally of the frame Il).l The handle 23 carries an arcuate, toothed rack 25 positioned to mesh with the teeth of the ring gear I8. Avst'ud 26 projects outwardly from the carriage I5 into van elongated slot I2I in the handle 23 so that, as the handle is swung forwardly, the stud will move the carriage I5 forwardly, always maintaining the teeth of the ring gear I8 in mesh 'with the teeth of the The 'pipe upon wl'iich` the device is to operate is indicated in broken line at 28. This pipe is passed over a grooved supporting roller 29 in the end member I2, thence through the tube '13. A weighted, eccentric cam 30 rests upon the pipe 28 over the roller 29 to prevent reverse movement of the pipe.
In operation, the extremity of the pipe 28 is placed againstv the wall of the excavation and the lever 23 is forced forwardly. This causes the stud 26 to move the carriage I5 forwardly, and also causes the rack 25 to rotate the gear I8. The initial rotation of the gear I8 urges the dogs 2I inwardly through the guide openings 32 against the opposite sides of the pipe. When the pipe has been rrnly gripped by the dogs, the ring gear I8, the tube I3, and the pipe 28 will move forwardly as a unit with a spiral motion.
When the extremity of movement has been reached, the lever 23 is pulled rearwardly, the dog 30 preventing the pipe 28 from moving rearwardly. This reverses the ring gear I S on the extremity of the tube I3 to cause it to withdraw the dogs 2| from the pipe and allow them to move rearwardly to a newl gripping position when the process is repeated. Thus, the pipe is forced with a spiral movement in a series of steps. Water may be supplied to the pipe 28 through a conventional swivel connection to assist the boring, if desired.
While a specic form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, without departing from the spirit of the invention.
Having thus described the invention, what is claimed and desired secured by Letters Patent is:
1. A pipe boring jack comprising: a supporting frame; a carriage slidably mounted in said frame; a tubular member adapted to receive the pipe mounted on said carriage; clutching means on said tubular member for clutching said pipe; lever means hingedly mounted on said frame and extending upward alongside said carriage; means projecting from said carriage into engagement with said lever means for moving the carriage forwardly; "an arcuate toothed rack formed on said lever means; and a ring gear on said tubular member meshing with the teeth of said rack to rotate the former with each forward movement of said lever means the teeth of said rack being suillciently long to allow the teeth of the ring gear to slide therealong so as to remain in mesh during the relative movement between said carriage and said Supporting frame.
2. A pipe forcing jack comprising: a base frame; end members arising from said frame; parallel bars extending between said end mem-Y bers; a carriage slidably mounted on said bars a tubular member rotatably mounted on said carriage for receiving a pipe; clutching means in said tubular member for engaging said pipe; a lever pivotally mounted on said base frame; a pin projecting from said carriage into an elongated slot in said lever to move the carriage forwardly with each forward movement of said lever; an arcuate toothed rack projecting from said lever; and an annular toothed gear mounted on said tubular member and meshing with said rack so that each forward movement of said lever will simultaneously rotate said gear and move said carriage forwardly relative to the pivot point of said lever, the teeth of Said arcuate rack aligning with the axis of said tubular member at their point of contact with the teeth of said gear and being sufficiently long to remain in mesh with said gear teeth at all relative positions between said carriage and the pivot point of said lever.
3. A pipe forcing jack comprising: a base frame; end members arising from said frame; parallel bars extending between said end members; a carriage slidably mounted on said bars; a tubular member rotatably mounted on said carriage for receiving a pipe; a ring gear rotatably mounted on said tubular member; pipe-engaging dogs hingedly mounted on said ring gear and extending tangentially inward through guide openings in said tubular member so that rotation of said gear on said member will force said dogs against said pipe; a lever hingedly mounted on said frame and extending upward adjacent said carriage; a pin etxending from said carriage into engagement with said lever for communicating the movements of said lever to said carriagey to move the latter longitudinally along side parallel bars; and an arcuate toothed rack carried by said lever in mesh with said'ring gear for rotating the latter as it moves along said bars.
REFERENCES CITED The following references are of record in the file of this patent:
UNITED STATES PATENTS