US1519981A - Supporting means for rock drills - Google Patents

Description

Dec. M5, i924. 1,51%,981

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SUPPORTING MEANS FOR ROCK DRILLS Filed July 1, 1920 Patented Dec. 16, 1924.

pairs-o STATES TATENT OFFTCE.

CHESTER MOTT, OF DENVER, COLORADO, ASSIGNOR TO SULLIVAN MACHINERY COM- PANY, A CORPORATION OF MASSACHUSETTS.

SUPPORTING MEANS FOR ROCK DRILLS.

Application filed July 1,

To all whom z't may concern:

Be it known that I, CHESTER Mo'rT, a citizen of the United States, residing at Denver, in the county of Denver and State of Colorado, have invented certain new and useful Improvements in Supporting Means for Rock Drills, of which the following is a full, clear, and exact specification.

My invention relates to supporting means for rock drills, and more particularly to guiding and supporting means for rock drills of the type known as stopers.

The object of my invention is to provide an improved attachable support for use in connection with stoping drills. A further object of my invention is to provide an improved support which may be readily attached and detached from a stoping drill of stock commercial ,form, and which will permit the use of the normal feed of such drills to the maximum limit. A further object of my invention is to provide an improved support for sto-ping drills which, when attached to the feed cylinders thereof, will support the drills in such a manner as almost entirely to avoid the usual difliculties experienced, due to side stress and binding of the feed piston rod when the drill is at. the forward end of its feed and the cramping of the-drill steel in the hole. Furtherobjects of my invention will appear in the course of the. accompanying specification.

In the accompanying drawings I have shown for purposes of illustration, one form which my invention may assume in practice.

In these drawings,-

Fig. 1 is a. side elevation of a stoping drill provided with a forin of support which I have selected for disclosure as an illustrative embodiment of my invention, certain portions of the feed mechanism of the drill and of my improved support being shown broken away to illustrate details of construction.

Fig. 2 is a transverse section on the line 22 of Fig. 1.

In the illustrative embodiment of my invention I have shown my improved support mechanism used in connection with a' stoping drill of familiar commercial con struction. -As is well known to those 1920. Serial No. 393,470.

versed in this art, these drills comprise a motor herein designated by 1, to the rear end of which is secured a piston rod 2 which is actuated by a piston 3 located in a feed cylinder 4:, the feed of the drill being controlled by a throttle valve 5, and by a brake of familiar construction 6. Suitable automatic steel rotation is provided.

When working at a considerable angle in a stope, it has been found that when the drill is fed forward toward the maximum limit of its feeding movement, the weight of the parts puts a great side stress-upon the bearing for the piston rod in the front end of the feed cylinder, and that the leverage of the parts about this bearing as a fulcrum causes the piston to tend to bind very tightly against the interior wall of the feed cylinder, if due to wear of the parts, sufficient play of the piston rod in its bearing is present to permit this to occur. It also causes the cramping of the drill steel in the hole. In order to avoid these disadvantages I have provided for attachment to the ordinary stoping drill, a sup ort mechanism which I have generally indicated by 10 in the accompanying drawings. This support is mounted at its rear end by means of a suitable split clamp 11 and bolt 12 upon the exterior of the feed cylinder 4. Extending forwardly in parallelism. to the axis of the feed cylinder and drill, and laterally displaced by a small distance, is a member 13 which, at its forward end, is provided with aguide/portion illustrated in Fig. 2, designated as 14. This guide is so constructed as to provide a sliding fit as at 15 ,for a portion of the periphery of the cylinder of the drill 1. To provide a proper support for the front end of the member 13 and prevent its function being destroyed by bending about its point of clamping to the cylinder 4, I provide a longitudinal bore 18 in which an extension guide rod 19, shown as at 21, is slidable with a spring 20 behind the same to cause it to be extended.

The operation of my improved device will be evident from an inspection of Fig. 1. When it is desired to employ my support, it is clamped in position on the feed cylinder, and just to one side of and below the position where it is desired to drill the .reception of the guiding point 21.

intended hole, a short socket is spotted in and drilled out for an inch or two for 1t lie 1e lower end of the feed cylinder being sup ported on a suitable rest, here shown as 23, and the upper end of the guide member being supported as-shown 'at 24 in the hole just described, the drill 1 may be fed forward and will slide in the guide 14;, being guided thereby and supported in alinement with the'axis of the feed cylinder. It will be obvious that even though the drill may be fed out to substantially the end of its feed, the cylinder thereof Will still be guided by the support member 14, and tendency to- Ward binding of the rod 2 in the bearingthereof at the front end-of the feed cylinder .4 and of the piston in the cylinder will be entirely prevented.

From the foregoing description, it will be obvious that I have provided a simple and readily attachable mechanism for use with stoping drills of standard construction, whereby the motor thereof may be supported and difficulties in operation dueto binding of the feed piston rod may be avoided.

' It will also be noted that this mechanism relieves the runner of the necessary holding of the drill during the starting of a hole, the weight being considerable in a tool of this type.

While I have in this application specificially described 'one form which my invention may assume in practice, it will be understood that this form of the same is shown for purposes of illustration and that the invention may be modified and embodied in other forms without departing from'its spirit or the scope of the appended claims.

What I claim as new and desire to secure by Letters Patent is:

l. The combination with a drilling apparatus comprising a drill actuating motor and feeding means therefor comprising a cylinder and piston, of a guiding member secured to one of said last mentioned elements and having a guide parallel to the line of motion of said motor and by which said motor is guided, and extensible means adjacent the free end of said member to support the same in a hole in the face which is to be drilled.

2. The combination with a drilling apparatus comprising a drill actuating motor and feeding means therefor for comprising a cylinder and piston, of a guiding member secured to one of said last mentioned elements and having a guide parallel to the line of motion of said motor and by which said motor is guided, and automatically extensible means adjacent the free end of said member to support the same in a hole in the face which is to be drilled.

3. For use in combination with a drilling apparatus comprising a tool actuating motor and feedingmeans therefor comprising,

a cylinder and piston, supporting and guiding means for said motor comprising a guiding member, a member extending therefronr longitudinally of and parallel to said feeding means and adapted to clamp one of the elements of the latter, a member telescopically arranged with respect to said last named member and adapted to engage a hole in the working face, and means between said members to normally extend them.

In testimony whereof I aifix my signature.

CHESTER MOTT.

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