US1719468A - Guide head for drill steels - Google Patents

Description

Patented July 2, 1929.

UNITED STATES LPATENT'OFFICBJ- CHARLES C. HANSEN, 0F EASTON, PENNSYLVANIA, ASSIGNOR TO INGER-SOLL-RAND COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATIONOF NEW JERSEY.

GUIDE HEAD FOR DRILL STEELS.

Application filed September 26, 1928. Serial No. 308,507.

This invention relates to rock drills, but

more particularly to a guide for the working implement such as drill steels actuated by rock drills of the hammer type.

One object of the invent on is to gu1de and support the overhanging port1on of the working implement and another ob e ct is to insure the retention of the guide 1 n both the operative and inoperative positions. This, in the present instance, 1s accomplished by the same means ordlnarlly used for clamping the guide arms in the operative position.

Other objects will be in partobvious and in part pointed out hereinafter.

In the drawings illustrating the invention and in which similar reference characters refer to similar parts,

Figure 1 is a side elevation of a front end of a rock drill shell having the inventlon applied thereto,

Figure 2 is a transverse view taken through Figure 1 on the line 22 looking in the direction indicated by the arrows, and

Figure 3 is a plan view of the guide showing a modification of the invention.

Referring more particularly to the drawings, A represents the front end of a rock drill shell and B the front head of a rock drill for which the shell A forms a guide. The shell A is provided with lugs C to su port side bolts D' whiehin turn pivotal y support at their front ends arms E comprising a guide for a working implement F which projects into the front head B to receive the blows of a hammer piston (not shown).

The arms E may be in most respects s1milar to those commonly employed for guiding drill steels and accordingly have recesses G in adjacent surfaces which in the closed position of the arms E register and form a guideway for guiding the drill steel F.

The arms E are provided at their outer ends with the usual grooves H formed in the sides of the arms and extend over the tops thereof to receive a U-clamp J whereby the arms E are held in the operative POSI- tion for guiding the drill steel F.

When changing drill steels in the drill, the U-clamp J is removed from the grooves H and the side arms are then rocked rearwardly of the shell A to a position similar to that illustrated in dot and dash lines in tendency of the side arms to swing for wardly to the operative or guiding position. In order therefore to insure the retention of the guide arms in the inoperative position, the said guide arms are provided with apertures K into which the U-clamp J may be disposed for the purpose of holding said side arms immovable during the changing of the drill steel F, thus serving the dual function of holding the side arms out of the inoperative position and also of providing a definite place in which the U-clamp J may be disposed while such changes are taking place to assure against the possibility of mislaying or losing of the U-clamp.

In the modification illustrated in Figure 3, grooves L are formed on the inner or adjacent surfaces of the side arms E. These grooves L lie in the same transverse lane as the grooves H which they join at the upper surfaces of the side arms E. The grooves L are preferably of such depth that when the side arms E are rocked rearwardly to the inoperative position illustrated, and wherein said grooves L will occupy substantially the same relative positions with respect to each other as the groovesH in the operative position, the U-clamp J may be readily disposed therein to retain the side arms E out of the guiding position.

The following is a brief description of the operation of the device. Normally during the drilling of rock, the side arms E will occupy a position toform a guide for the drill steel F. The guiding or operative po-' sition of the side arms E is illustrated in Figures 1 and 2. In this position of the guide arms, the U-clamp J will be disposed in the grooves H and will remain seated in said grooves unaffected by the vibration incident to drilling. Whenever it is desired to change the drill steel, the U-clamp J is removed from the grooves H and the side arms are then rocked about the side bolts D to a position wherein the U-clamp J may be disposed in the apertures K to hold the side arms E rearwardly of the shell. After the drill steel has been inserted in the front head B, the side arms are again rocked to their guiding position and the U-clamp J is disposed in the grooves H to hold the guide arms in the operative position.

I claim: 7

1. A guide for drill steels comprising a pair of varms adapted to be pivotally connected to a rock drill shell, said arms having recesses adapted to register for guiding a drill steel, a 'U-clamp, and indentations in the arms to receive the U-clamp for bothsecuring the arms in the operative and inoperative positions.

2. A guide comprising a. pair of arms adapted to be pivotally connected to a rock drill shell, said arms having recesses in adjacent sides registering in the operative position of the arms to slidably receive and guide a drill steel, a U-clamp, grooves in the free ends of the arms in the sides thereof to receive the U-clamp for holding the arms in position to guide the drill steel, and apertures in the arms intermediate their ends for the reception of the =U-clamp to hold the arms in the inoperative position.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN.

Images