US1981992A

US1981992A - Guide shell for rock drills

Info

Publication number: US1981992A
Application number: US616777A
Authority: US
Inventors: John C Curtis
Original assignee: Cleveland Rock Drill Co
Current assignee: Cleveland Rock Drill Co
Priority date: 1932-06-13
Filing date: 1932-06-13
Publication date: 1934-11-27
Anticipated expiration: 1951-11-27

Description

Nov. 27, 1934. J. c. CURTIS 1,981,992

GUIDE SHELL FOR'ROCK DRILLS Filed June 13, 1932 JOHN c'. ewe 775 INVENTOR ATTORNEY- Patented Nov. 27, 1934 units!) srArss GUIDE SHELL FDR ROCK DRILLS John 0. Curtis, Cleveland, Ohio, assignor to The Cleveland Roch Drill Company, Cleveland, Ohio,

a corporation of Ohio Application June 13, 1932, Serial No. 616,777

3 Claims.

This invention relates broadly to rock drills but more particularly to guide shell for rock drills of the drifter type.

Generally the guide shells for rock drills are provided with a pair of longitudinally disposed guide ways within which the guide bars of the rock drill cylinder are free to slide back and forth. It has been found that the engaging surfaces of such guide ways and guide bars are liable to wear and to affect the accuracy with which the rock drill will slide in the shell. To remedy this deleterious condition, it was necessary to replace the complete guide shell and often the cylinder of the rock drill, thus increasing the cost of operation.

One of the objects of this invention is to construct a guide shell with detachable guide bars upon which the rock drill may slide, permitting thereby the renewal of the Worn guide bars to restore the assembly to its original condition.

Another object of this invention is to provide a guide shell for rock drills manufactured out of relatively fiat stock bent to a desired shape with enlarged guide bars of sufficient cross section to afford adequate rigidity, and enable the guide shell to withstand the severe strains to which mountings of this type are subjected, thus reducing the cost of manufacture and also maintaining the weight of the guide shell to a minimum.

Other objects more or less ancillary to the foregoing and the manner in which the various objects are attained reside in the specific construction and aggroupment of the elements peculiar to this construction, as will become apparent from a more complete examination of this specification, in the claims of which there are assembled certain specific combinations indicative of the scope and spirit of the invention.

In the drawing:

Fig. l is a cross sectional view of the assembly illustrating the invention.

Fig. 2 is a cross sectional view of the guide shell assembly taken in a plane indicated by line 22 in Fig. 3.

Fig. 3 is an end View of the guide shell assembly as seen by looking in the direction pointed out by the arrows 3-3 in Fig. 2.

Fig. 4 is a perspective end view of the guide shell and the guiding bars ready to be assembled.

Referring now to the drawing, represents the body of a guide shell manufactured of relatively thin flat stock bent substantially to a U shape. The outer ends of the side walls thereof are bent inwardly to form two gibs 11 in parallel alignment with each other and extending substantially the full length of the guide shell. Circumventing each of the gibs 11, there is a guide bar 12 provided with a slot 13 extending the full length of the bars for engagement over thegibs 11. For the purpose of securing the guide bars 12 upon the gibs 11, one end of these gibs is provided with a cut away portion or notch 14 formed on the ex ternal side of the-gibs. Toward the other end, the gibs 11 are provided with an aperture 15 vertically disposed therethrough. One end of the guide bars 12 is provided with a tongue 16 pro jecting from the upper' wall thereof and of a width substantially equal to the width of the notches 14. Toward the other end, the upper and lower wall of the guide bars 12 are provided with vertically disposed apertures 17. Secured to the lower wall of the shell 10, there is a cone 18 by which the complete assembly may be afiixed to any suitable supporting device.

In assembling the guide shell, the guide bars 12 are positioned over the gibs 11 in such a manner as to afford the registration of the apertures 17 with the apertures 15. Through these apertures there is introduced a bolt 19 capable of screw tight engagement with a nut 20 for clamping the parts together. Subsequently the tongues 16 are bent downwardly within the notches 14 as illustrated in Fig. 3, thus rigidly securing the guide bars 12 upon the gibs 11. The bolts 19 are primarily intended to prevent the longitudinal movement of the guide bars, while the tongues 16 within the notches 14 are intended to limit the lateral movement of the guide bars with respect to the guide shell.

The rock drill comprises a cylinder 21 having provided within the lower portion thereof two longitudinally disposed guide ways 22 affording wearing surfaces 23 and 24 capable of slidable engagement upon the guide bars 12.

With this construction, it will be seen that the guide bars 12 may readily be renewed by removing the bolts 19, and sliding the tongues 16 and guide bars 12 out of their respective engagement with the notches 14 and gibs 11. The guide shell body is never submitted to wear, thus the assembly may remain in use by replacing the worn guide bars by oversize guide bars to compensate for the wear of the bearing surfaces 23 and 24 of the guide ways 22. By bending the tongues 16 downwardly into the notches 14, the cylinder 20 is free to pass over that end of the guide bars without any interference. The bolts 18 are positioned in such a manner as to not interfere with the rearward travel of the cylinder.

This travel is limited by the reed screw bushing generally located within that end of the guide shell and ahead of the bolts 18.

Although the foregoing description is necessarily of a detailed character, in order to completely set forth the invention, it is to be understood that the specific terminology is not intended to be restrictive or confining and it is to be further understood that various rearrangements of parts and modification of structural detail may be resorted to without departing from the scope or spirit of the invention as herein claimed.

I claim:

1. A support for rock drill comprising an elongated shell formed with side walls having guide bars receiving walls extending therefrom in parallelism, guide bars detachably secured to said.

guide receiving walls, guideways within said rock drill adapted to receive said guide bars for slidable movement thereon, notches within one end of said shell adapted to receive a tongue depending from one end of said guide bars for preventing the lateral movement of the latter with respect to theformer, and detachable means comprising a bolt and a nut for securing the other end of said guide bars to'said shell, the removal of said last mentioned means permitting the removal of said guide bars from said shell irrespective of the engagement of said tongues with said notches,

2. A support for rock drill comprising an elongated shell formed with side walls having guide bars receiving walls extending therefrom in parallelism, guide bars detachably secured to said guide receiving walls, guideways within said rock drill adapted to receive said guide bars for slidable movement thereon, means formed on said shell and said guide bars engageable with each other for locking one end of the latter against relative lateral movement with the former, and removable means for securing the other end of said guide bars to said shell, the removal of said last mentioned means permitting the removal of said guide bars from said shell irrespective of said first mentioned means.

3. A support for rock drill comprising an elongated shell formed with side walls having guide bars receiving walls extending therefrom in parallelism, guide bars detachably secured to said guide receiving walls, guideways within said rock drill adapted to receive said guide bars for slidable movement thereon, means formed on said shell and said guide bars engageable with each other for locking one end of the latter against relative lateral movement with the former, said means being located within the path of the slidable movement of said rock drill on said guide bars and permitting said movement, and removable means located out of said path for securing the other end of said guide bars to said shell, the removal of said last mentioned means permitting the removal of said guide bars from said shell irrespective of said first mentioned means.

' 'JOHN C. CURTIS.