US1006339A - Rock-drill. - Google Patents

Description

T. E. ADAMS.

ROCK DRILL.

- APPLIoATIoN FILED AUG. 12-i 190s. 1,006,339, Patented 001.1112911.

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'HINIII il!i T. E. ADAMS.

ROCK DRILL.

APPLICATION FILED 11116.12. 190s.

INVEN'YOR fam..

NOGRAPH co.. WASHINGTON. D. c.

coLuMBIA PLA TI-IGMAS EDGAR ADAMS, 0F CLEVELAND, OHIO.

ROCK-Daim..

Specication of Letters Patent.

Patented Oct. 17, 1911.

Application filed August 12, 1908. Serial No. 448,228.

T 0 all whom it may concern:

Be it known that I, THOMAS E. ADAMS, of Cleveland, in the county of Cuyahoga and State of Ohio, have invented certain new and useful Improvements in RocksDrills; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same. y

This invention relates to improvements in rock drills and machines of kindred type,

the object of the invention being to provide a small machine which can be'handled and controlled by'one man.

A further object is to so construct a machine of the hammer type that it shall comprise a few parts; so that it can be easily operated' andcontrolled, and so that the motor may be permitted to run without causing the hammer to be reciprocated when the tool is not in contact with the work.

With these objects in view the invention consists in certain novel features of construction andy combinations of parts as hereinafter set forth and pointed out in the claims. In the accompanying drawings, Figure 1 is a longitudinal sectional view of a rock drill embodying my improvements, and Fig. 2 is a similar view showing the hammer `head 23 in its outer position and the member36 moved back. Y

1 represents the casing of an alternating current electric motor and which also forms the head of the drill.` The casing 1 is provided at one side with an internally threaded annular flange 2 which receives a barrel 3, in the outer portion of which a bushing 4 is located. Atthe other side the casing is provided with an annular flange 5 which is internally threaded for the reception of a cap 6 having an enlargement 7 provided with a hole to receive a handle 8. In order to prevent the turning of the cap 6 and the barrel 5 relatively to the casing l, spring actuated locking-bolts 9-10 are provided and housed in hollow enlargements 11-12 on the casing 1. These locking bolts engage the barrel 5 and cap6 respectively, in which position they are retained by means of springs 13 located within the hollow enlargements 12 and surrounding the Shanks 14 of the locking bolts. The Shanks 14 project upwardly or outwardly beyond the enlargements 12 so that they may be grasped when it is desired to disengage said locking bolts from the barrel 3 and the cap 6. The stator of the motor is rigid with the casing 1 and the latter is provided with openings 1.5 for the admission of air for Ventilating purposes.V The rotor of the motor is constructed with Ventilating passages 16 and is secured to a tubular shaft 17 having bearings in bushings 18-19 located within the casing 1 at respective sides thereof. The cap 6 is provided with a tubular extension 2() which enters one end of the tubular shaft 17 and receives one end of a hammer rod or shank 21 so as to guide the movements of the same. The rod 21 is made with a lubricant duct 21a which receives lubricant from a chamber 20a formed' by the tubular extension 20. The forward end yof rod 21 enters and is secured to a hub 22 having a cam 31 thereon, and lubricant is supplied toV said cam from the duct 21a through ports 22". The hub 22 is provided at its forward end with a hammer head 23 to move in that portion ofthe barrel 3 wherein the bushing 4 is located. The forward end of the barrel is made with an opening to aline with a similar opening in the bushing, for the accommodation of an anvil or striking piece 24 to be engaged by the hammer. The anvil 24 passes through a nose 25 at the forward end of the barrel 3 and is provided with a shoulder 24EL to engage the end of said nose. A socket is made in the anvil for the reception of a bit or tool 26 and the latter is made with flat faces 27 to be engaged by the inner ends of screws 28 which pass through the y tubular portion of the anvil. The anvil is provided with openings 28a which receive the inner ends of the screws 28 passing through the wall of the nose 25. In this manner, the bit is guided by the anvil and prevented from turning therein and at the same time the anvil is permitted to change position to receive or not receive blows from the hammer 23.

When drilling downwardly the operator can turn the machine body by means of the handle 8 to increase the rate of cutting and prevent the hole from rifling. Y

A spring 29 encircles the rod or hammer stem 21 within the tubular shaft 17, said spring bearing at one end against the tubular extension 20 of cap 6 and at the other end against a shoulder 30 formed by the hub 22 at the forward end of said rod or stem.

This spring serves to drive the hammer forwardly and causes it to engage the striking piece 24 and thereby actuate the drill bit or tool 26.

The cam 31 on the hub 22 is approximately three fourths of a spiral convolution. A collar 32 is secured to the tubular shaft 17 and is provided with a forwardly projecting arm 33 to the free end of which a pin 34 is secured. This pin projects from the arm 33 in a direction toward the hub 22 and is provided with a roller 35 to engage the spiral cam 31. The pin 34 is provided in its free end with a groove 34a which will receive lubricant from the hub, and such lubricant will be thrown by centrifugal force from said groove and permitted to lubricate the bearing of the roller 35 on the pin 34.

From the construction and arrangement of parts above described, it is apparent that as the rotor of the motor turns, the engagement of the roller 35 on the pin 34 with the cam 3l, the hammer will be withdrawn until said roller passes the end of the cam, when the spring 29 will force the hammer forwardly and cause the operation of the tool 26 through the medium of the anvil or striking piece 24. If desired, more than a single cam 31 and pin 34 may be employed. In order to effect such operation of the hammer as above described, it is necessary that the same shall be prevented from turning when it is being withdrawn to compress the spring 29 and for this purpose a bar 36 is pivotally supported at one end and its other end is pressed toward the hammer head by means of a spring 37 so as to be engaged by any one of a series of projections 38 on said hammer head,-the coperation of said projection with the bar 36 permitting the hammer to move longitudinally but preventing it from turning. The forward end of the bar 36 is provided with a cam or beveled shoulder 39 to be engaged by the hammer head 23 when the latter moves to the eXtreme end of its stroke. From this construction it will be seen that when the tool or bit 26 is not in contact with the work, the spring 29 will force the hammer head to the eXtreme end of its stroke and the anvil or striking piece forwardly through the nose 25, the hammer head 23 engaging the cam or beveled shoulder 39 of the bar 36 and forcing said bar out of engagement and alinement with the projections 38 on the hammer head. Thus when the tool is not in contactY with the work, the motor can be permitted to run without operating the hammer because when the bar 36 is out of the path of the projection 38, the hammer will rotate with the arm 33 and the tubular shaft of the rotor to which it is attached. In order to permit such rotative movement of the hammer, a comparatively light spring 39L is seated at one end in a socket 39b in the rod 21, and

bears at its other end against a shoulder 39c on a rod 39d, the latter having a bearing in the upper end of the tubular extension 20 and passing partially through the spring 39a. If the striking spring 29 is made long enough to be under compression when the blow is struck, there will be a recoil, but such recoil will be taken up by the light spring 39a, the latter also serving to hold the hammer in rotative position. As soon as the bit is pressed against the rock so as to move the striking piece 24 and the hammer head 23 rearwardly a short distance, the bar 36 will be promptly pressed by the spring 37 in position to be engaged by one of the projections 38 and the operation of the drill will at once become effective.

If desired the bar 36 may be provided with a projection 40 passing through a hole in the barrel 3, whereby the operator can control the starting and stopping of the effective operation of the hammer and bit manually.

The electrical connections for the motor may be eifected by means of a series of iingers 52 properly connected with the motor coils and projecting into a socket 53 at one end or side of the casing 1, and coperating with a series of socket pieces 54 carried by a block 55 of insulating material adapted to be inserted into the socket 53, the sockets 54 being adapted for connection with a source of electrical energy which in the present instance may be a three phase alternating current.

Having fully described my invention what I claim as new and desire to secure by Letters-Patent, is

1. In a drill, the combination with a hammer, a motor, a movable tool, and means for reciprocating the hammer to operate the tool, of means operating automatically to permit the inoperation of the hammer while the motor is running and when the tool is not in operative relation to the work.

2. In a'drill, thecombination with a hammer, a movable tool, a motor, and means for operating the hammer to operate the-tool, of means operating automatically'to permit the inoperation of the hammer while the motor is running and the tool is not in op# erative relation to the work and operated by the tool when pressed against the work to permit the operation of the hammer operating means.

3. In a drill, the combination with a casing and a motor therein, of a movable tool, a hammer to operate the tool and having a projection thereon, a cam on said hammer, an arm secured to the rotary member of the motor and having a pin coperating with said cam to withdraw the hammer, a spring for propelling the hammer, a pivoted arm to engage the projection on the hammer and prevent the rotation of the latter, and a finger piece on said arm for moving the same out of the path of the projection on the hammer.

4. In a drill, the combination with a casing, a motor therein and a tubular shaft to which the rotary member of said motor is secured, of a cap secured to the casing and having a tubular projection entering said tubular shaft, an arm secured to the other end of the tubular shaft, a hammer provided with a cam to coperate with said arm, a shank projecting from the hammer, passing partially through the tubular shaft and guided in the tubular extension on said cap, a spring encircling the hammer shank and bearing at one end against the tubular eX tension on the cap, a shoulder at the forward end of the hammer shank against which the other end of said spring bears, and an anvil to be engaged by the hammer.

5. In a drill, the combination with a casing and a motor therein, of a hammer, a cam carried thereby, an arm secured to the rotary member of the motor and coperating with said cam, a spring for propelling the hammer, a striking piece-or anvil to be engaged by the hammer, projections on the hammer, a spring pressed bar to be engaged by any one of said projections to prevent the rotation of the hammer, and a cam or beveled shoulder on said movable baiI in position to be engaged by the hammer, whereby said bar will be moved out of the path of the projections on the hammer when the latter reaches the forward extremity of its thro-w and the tool actuated by the anvil is not pressing against the Work.

6. In a drill, the combination with a casing and a motor therein, of a barrel attached to said casing, a spring actuated locking bolt securing the barrel to the casing and preventing the rotation of one relatively to that of the other, a cap on the other side of said casing, a spring actuated locking bolt carried by the casing and engaging said cap, a hammer disposed in said barrel, a cam carried by the hammer, an arm carried by the rotary member of the motor and cooperating with said cam to withdraw the hammer, a spring to propel the hammer forwardly, and a striking piece mounted in the nose of the barrel and adapted to be engaged by said hammer.

7. The combination of an anvil to operate a tool, a hammer, means including a motor for reciprocating the hammer, and mechanical devices controlled by the position of the anvil for controlling the reciprocation of the hammer while the motor is running.

In testimony whereof, I have signed this specication in the presence of two subscribing witnesses.

THOMAS EDGAR ADAMS.

Vitnesses:

C. A. I-IosKINs, A. L. -I-IOKING.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents, Washington, D. C.

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