US1390787A - Drilling-machine - Google Patents

Description

C. A. HULTQU-IST.'

DRILLING MACHINE. `APPLICATION FILED AUG.26, 1918.

1,890,787. Patendsept. 13,1921.

2 SHEETS-SHEET l.

auf/1MM.: A

c. A. num T. DmLLrNG M E. APPLICATION FILED AUG.26 1918 PatentedSept. 13, 1921.

2 SHEET sssssss 2.

`omitted for c UNITED STATES PATENT OFFICE.

CHARLES A. HULTQUIST, 0F LGS ANGELES, CALIFORNIA.

l pauline-MACHINE.

Specication of Letters Patent.

Patented Sept. 13, 1921.

Application led August 26, 1918. Serial No. 251,415.

To all whom it may concern.:

Be it known that I, CHARLES A. HULT- QUIsT, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented a new and useful Drilling-Machine, of which the following is a specification.

This device relates to drilling or boring machines and more especially to means for turning the drill steel in a step by step rotation so as to bring its cutting edge into different relations to the surface being acted upon by the drilling steel.

An object of the invention is to produce a device of this character which .is elicient in operation and not liable to get out of order.

Another object is to minimize wear between certain of the parts of the steelfturning mechanism.

Another object is to provide a construction in which a certain element subject to wear may be readily replaced when it becomes necessary or desirable to make the replacement. y

Another object is to provide turning mechanism in the head of the drilling machine.

Other objects and advantages will appear inthe subjoined detailed description.

The accompanying drawings illustrate the invention:

Figure 1 is a side elevation of a drilling machine built in accordance with this invention, a portion of the drill steel being broken away to contract the view.

Fig. 2 is an enlarged vertical mid section of the head portion of the drilling machine shown in Fig. 1, the lane of section being Fig. 4 is a plan section on line w-w*,

Fig; 2.

ig. 5 `is a sectional elevation on line :v5-w", Fig. 2 the plunger and valve being learness of illustration and a portion ofthe valve chamber being broken away to contract the view. y

Flg. 6 is an inverted plan section on line mL-w, Fig. 2.

Fig. Z `is a perspective view Aof the plunger. v

Fig. 8'is a b perspective view of the toggle Fig. 9 is a perspective view of the steel holding bushing and its pawls.

Fig. 10 is a perspective view of the ratchet ring.

The machine shown in Fig. 1 oi the drawings belongs to the type generally known as a stoping machine, and it is understood that the invention is not restricted to its enibodiment as a stoping machine but is applicable t0 any drilling machine having a drill steel which is rotated with a step by step movement.

There is provided a cylinder 1 and mounted upon the upper end of the cylinder is a head comprising two sections, a lower section 2 and an upper section 3. The lower section 2 is chambered at 1 to accommodate an anvil 5 against which the piston, not shown, workingin the cylinder 1 is adapted to strike as is well understood in the art pertaining to this class of drilling machines. The anvil 5 is adapted to strike the butt end of a drill steel 6 which is of angular cross section and which fits a hole 7 of angular cross section extending axially through a bushing 8. The bushing 8 is journaled in the head section 3 and the bushing comprises portions having different diameters, an inner base portion 9, a pawl carrying portion 10 of less diameter than the base 9, and an outer end portion 11 of less diameter than the portion 10, journaled directly in a reduced portion 12 of the upper head section. The pawl carrying portion 10 is provided `with longitudinally extending grooves 13 so that the pawls 14 can be slid into the grooves 13 from the grooves 15. `The pivotal portions 16 of the pawls fit the inner portions of the grooves 13 so that the pawls cannot be withdrawn from the grooves 13 excepting by endwise movement of the pawls into the grooves 15.

The pawls 14 are adapted to engage teeth 17 in a ratchet ring 1S which is journaled in the head section 3 and engages a shoulder 18 of the head section 3 It is clear that if the ratchet ring 18 be turned in one direction the pawls 14 will be engaged by the appropriate teeth to turn the bushing 8 and that if the ratchet ring 18 be turned in the opposite direction the teeth will slide over the pawls so as to eii'ect no turning movement of the bushing. The pawls 14 are yieldingly held outward in engagement with the appropriate teeth by pins 19 seated in the outer ends et' recesses 20 in the portion 10 of the bushing, there being springs 21 in the inner ends of the recesses to yieldingly hold the pins 1U outward so as to force the pawls into engagement with the ratchet ring.

The base 9 of the bushing is recessed at 22 to accommodate a portion of the anvil 5 when said anvil is struck by the piston, not shown.

The means for turning the ratchet'ring 18 will now be described. The ratchet ring is provided with a laterally extending arm 23 having on one side face a longitudinally extending rib or boss 24 convex in cross section adapted to engage a flat wear face 25 I at one side of a recess 26 which is Jformed in the side of a cylindrical plunger 27. The

opposite side face 28 of the recess 26 is provided with a groove 29 extending transversely of the longitudinal axis of the plunger. The arm 23 is provided on the side face opposed to that having the boss 24 with a groove 30 extending'parallel with said boss and the groove 29. Engaging the grooves 29 and 30 are the rounded edges 30 of a toggle bar 31. Thus the arm 23 and toggle bar 31 Jform a toggle connection between the ratchet ring and the plunger.

The plunger 27 is reciprocatively mounted in a chamber 32 in the head section 3, the ends of said chamber being formed by removable plugs 33. When the plunger 27 is reeiprocated in the chamber 32 the boss 24 and toggle 31 serve to communicate motion from the plunger to the arm 23 so as to turn the ring 18 on its axis. It is noted that the return stroke of the ring 18, in which the pawls 14 slip over the teeth 17, is effected by pressure of the plunger `face 25 against the boss 24. Since the pressure required to turn the ring 18 in its non-pawl engaging movement is comparatively slight, there will be very little wear occasioned on the face 25 and boss 24. However, when the plunger 27 moves in a direction to cause engagement of the ratchet teeth with the pawls, the pressure transmitted from the plunger 27 to the arm 23 through the toggle bar 31 is comparatively great and, since the ends of the toggle bar rotate in the grooves 29, 30, very little wear is occasioned. either of the . grooves 29, 30 or of the toggle bar 31. When the toggle bar 31 becomes worn by continued use so that there is too much play between it and the arm 23, it is clear that the toggle bar 31 may be readily replaced by a new one of the correct size to eliminate the looseness. The plunger chamber 32 is provided at its opposite ends with Huid induction ports 34, 35which communicate with ports 36, 37 respectively located in the head section 2. Also between the ports 34, 35 the chamber 32 is provided with exhaust ports 38, 39 which communicate with ports 40, 41 respectively in the head section 2. The ports 3G, 37 communicate with the middle portion of a valve chamber 42 in the head section 2 and said ports are controlled by a slide valve 43 reciprocatively mounted in the valve chamber, the valve being so constructed that the port 36 is open when the valve is at one end of the valve chamber and the port 37 is open when the valve is at the other end of said chamber. The ports 40, 41 communicate with the end portions respectively of the valve chamber and are not affected by operation of the valve. The valve is of a well known type and therefore needs no further description.

Exhaust ports 44, 45 open from the end portions or the valve chamber 42 to the atmosphere. A fluid intake port 46 opens to the valve chamber 42 from a port 47 in the cylinder 1. Compressed fluid is admitted to the port 47 by suitable valve means indicated in general by the character 48. These valve means 48 may7 be of any construction known in the art and therefore not necessary to illustrate and describe in detail herein. It suffices to state that the valve means 48 admit the compressed fluid 'from the supply pipe 49 to the cylinder 1 and also to the port 47 to cause the piston, not shown, to deliver its blow on the anvil 5 in a manner well understood and to cause operation of the valve 43 and plunger 27 as will now be made clear.

Surrounding the inner end portion 9 of the bushing is a wear sleeve 50 which is of the same diameter as the ratchet ring 18 and. interposed between the ratchet ring and the outer end of the head section 2. This wear sleeve 50 holds the ratchet ring against the shoulder 18 and also serves to cover a recess 51 in the section 3 extending from the plunger chamber to the inner end of the section 3. This recess 51 accommodates the arm 23 when the ring 18 is being inserted into the head section 3. Thus the sleeve forms a smooth bearing entirely around the portion 9 of the bushing.

In practical operation, the operator will place the tool in position to bring the drill steel G in operative relation with the rock to be drilled and he will manipulate the liuid admission valve means 48 to admit compressed iuid to the cylinder 1 in a manner well understood in the art. Opening of the valve means 48 also admits the compressed fluid to the port 47 and, assuming that the valve 43 is in the position shown in Fig. 4 and that the plunger 27 is in the position shown in Fig. 3, it is clear that the compressed air will pass from the port 47 through the port 46 into the valve chamber 42, thence by way of the ports 37, 35 to the plunger chamber to drive the plunger in the irection of the arrow a, Fig. 3. The compressed fluid that may be in front of the moving plunger 27 exhausts from the lunger chamber through the port 34, ytliience through the port 36 into the valve chamber and from the valve chamber by way of the port 44 to the atmosphere. When the plunger 27 has moved sufficienti far to uncover the port 39 the compressed fluid passes from behind the plunger 27 through the port 39, thence through the port 41 to the valve chamber and the compressed fluid then operates to move the valve 43 in the direction of the arrow b Fig. 4. The valve 43 when thus moved opens the port 36 and closes the port 37 so that the operating fluid can pass from the valve chamber through the port 36 thence through the port 34 to the plunger chamber to move the plunger in a direction opposite to that indicated by the arrow a, thus causing the plunger to force compressed air from the valve chamber through the port 35, thence through the port 37 to the valve chamber and from the valve chamber throu h the exhaust port 45 to the atmosphere. hen the plunger has moved sufficiently far to uncover the port 38 the fluid flows through said port into the port 40 and thence to the valve chamber so as to again move the valve in the direction indicated by the arrow b.

When the plunger moves in the direction of the arrow a it turns the ring 18 counterclockwise in Fig). 3 against the pawls 14 which therefore ecome effective to turn the bushing 8 to rotate the drill steel 6. When the plunger 27 moves in the direction opposite to that indicated by the arrow a it turns the ring 18 clockwise in Fig. 3 so that the teeth 17 slip over the pawls 14, which consequently are ineffective to turn the bushing. The next stroke of the plunger 27 in the direction of the arrow a again turns the drill steel. Thus a step-by-step rotation of the drill steel is effected so as to bring its cutting edge into different relations with the material being operated on.

The invention is not limited in its broader aspects to the exact details shown in the drawings and above described, but embraces such changes and modifications as lie within the spirit and scope of the appended claims.

I claim:

1. In a drilling machine, a head having a plunger chamber, a bushing journaled in the head and adapted to engage a drill steel, a plunger in the plunger chamber having a recess in one side thereof with a fiat face, a ring journaled in the head and having an arm extending into the recess in the plunger, means to cause a step-by-step rotation of the bushing when the ring is turned, one side face of the arm and of the recess being grooved, the arm having a boss convex in cross section bearing against the flat face of the recess, a toggle having rounded edges inserted in the grooves respectively, and means to admit compressed fluid alternatively to opposite ends of the plunger chamber to reciprocate the plunger.

2. In a drilling machine, a sectional head, a plunger chamber in one of the sections, a plunger in the plunger chamber, means to admit an o erating fluid to the plunger chamber, a ushing journaled in the head and adapted to engage a drill steel, a ring journaled in the head and having an arm projecting into the plunger chamber and operative by movement of the plunger, means to transmit turning movement from the ring to the bushing, there being a recess extending from the plunger chamber to the inner end of the section having the plunger chamber to accommodate the arm when the ring is being inserted in the head, and a sleeve surrounding the bushing and interposed between the ring and the outer end of the other head section.

Signed at Los Angeles, California, this 19th day of August, 1918.

CHARLES A. HULTQUIST.

Witnesses:

GEORGE H. HILEs, L. BELLE WEAVER.

Images