US1918065A - Rock drill - Google Patents

Description

July 11, TE RY ROCK DRILL Filed July 50, 1931 n i was 769- 747 /709 IN VEN TOR.

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Q g Q g HISATTORNEY Patented July 11, 1933 UNITED STATES TENT-i misses EDWARD r. TERRY, or rI-Ii rrsBnne; NEW JERSEY, nssrdnon To mavensserm-RAND COMPANY, or JERSEY one,

unwiannsnY, A ooarona'rron or NEW JERSEY Application fiiii -sin so,

This invention relates to rock drillsfand more particularly to a. guide for rock drills of the type which are mounted in supports ing shells whereon they slide to and from the work. .5 V

One object of the invention is to minimize the cost of maintenance of rock drills of this type and another object is to equip the rock drill with a guide which may be convenient-e ly attached thereto and which-will remain in rigid assembled relationship with respect to the rock drill; 1

Other objects will be in part obvious and in part pointed out hereinafter. 1

In-the drawing accompanying thisspecification and in which'similar reference characters refer to similar parts, i

Figure l is a longitudinal elevation partly in section of a rock drill constructedin accordance with the practice of the invention,

Figure 2 is an end elevation illustrating the manner in which one end of the guide is secured to the rock drill, 4

Figures 3 and 4 are transverse views taken through Figure 1 on the lines 33 and 4% looking in the direction indicated by the arrows, and

Figure 5 is a perspective view of the guide. 7

Referring more particularly to the drawing, A designates generally a rock drill comprising a cylinder B and front and back heads C and D respectively which may be secured to the cylinder by side rods or bolts E arranged on the opposite sides of the drill.

Within the cylinder B is a reciprocatory hammer piston F having an extension G- which extends slidably through chuck mechanism designated generally by Hand being arranged in the front head C and in a bush ing J disposed in the front end of the cylinder B. The bushing J carries at its front end an external lateral flange K to seat upon the rear end of the front head 0.

The chuck mechanism H may, as is customary, be rotatable within the front head and the bushing J and, in the present instance, serves as a guide for an anvil block L against which the blows of the hammer piston F are delivered and which serves to 1931. Serial No. 552,938.

transmit suchblows .tothe working implement 0 g'uided by the chuck mechanisn'r'H.

In accordancewith the practice of the in.- vention and in contradistinction from the usual practice. of equipping the cylinder with integral guide ribs to slidably interlock with a mounting, such-as a shell P shown in: Figure 2, the rock drill is pro- "vided with a removable guide Q comprising a beam or. plate portion R which, in the assembled position, lies beneath the rock drill and more particularly beneath the cylinder B. The outer sides or edges of the beam R constitute guide ribs S which are adapted to slide in guidewaysT of the .shell'P. The beam B may be suitably reinforced by means of integral topiand bottom'ribs U and V ;respectively and which preferably extend alongthe entire length of the bea1n.-

Formed as'an integral'portion of the beam Rand on the front end thereof is a sleeve WV which,- in thefassembled position of the guide, is disposed between the front end of the cylinder B and the rear end of the flange K and has a bore Xto receive the portion of the bushing J adjacent the flange K against which the front end of the sleeve seats. I

On the rear end of the guide and on the bottom surface thereof is a lug Y having a bore Z to receive a feed nut b which is threaded in a well known manner for engagement with a feed screw 0 commonly employed for actuating the rock drill A longitudinally of the shell. The feed nut b may be held against rotation in any convenient manner. The rear end of thefeed nut 7) projects rearwardly of the lug Y and has a threaded exterior for the reception of a nut cl whereby the feed nut bis fastened securely in position.

The guide is of such length that when it I occupies the assembled position described the rear end thereof lies substantially in the same transverse plane as the rear end of, the back head D. Thus arranged'these ends of the back head and the guide serve as abutments for one side of a flexible connection 0 in the form of laminated springs comprising a plurality of plates f which extend laterally of the feed nut 2') upon which they are arranged to support the rear end of the rock i drill.

In order to maintain the weight of the flexible connection to a minimum the plates f may be of substantially Y-shape having stems wherein are formed apertureszh :to permit the stems g to be disposed cuplonrthe projecting end of the feed nut Z) between the rear 'endof the guide and the nut (Q whereby they are clamped securely together.

The diverging'wings or arms? of the ,Y

shaped plates f extend upwardly across the transverse medium plane of the rock drill and are provided with perforations '10 through which extend the side rods E'wherebyathe arms j ofthe plates f are clamped securely against the head D. r i I As a preferred form of construction the sleeve portion W of the guide is provided on rear end of the -.back

, its opposite sides with lugs 0 having aperas the ribs F of the present structureyare exposed to severe usage :and etc consequent great wear. This is a iactor which in structures wherein the guide ribs form an integral portion of the cylinder. B is the cause of considerable expense since, in such structures, whenever the guide ribs become worn to a state of unserviceability it becomes necessary to discard the entire cylinder. Constructed as in the present invention, Whenever the guide ribs'become worn only the comparatively inexpensive guide need be replaced. 1

Another highly desirable advantage is that, owing to-the provision of the flexible connection 6, any variations within'practical limits in the relative lengths of the guide and the casing parts of the rock drill, such as the'cylinder and'the back head, may be readily compensated for by the flexibility oi the plates comprising the connection 0. i

I claim': I

1, In combination, a rock drill having a plurality of easing parts, ,a guide for the rock drill, means .on the guide beingi-nterposed between adj acent casing par-ts, clamping means for securing the first-mentioned -means and the casing parts together, and ,a

flexible connection on'the clamping means and being secured to the guide :by the clamping means to support the rear end of the rock drill.

I2. In combination, a rock drill,-a guide for the rock drill, means on the guide forming a casing part of the rock, ielrillpa plate spring secured zto the rear end of the guide to support the rear' end of the rock .drill, and

bolts for clamping .the' said means and the I plate spring to the rockdrill. a i 3. In combination, a rocktlrill, a guide for the rock drill, a sleeve integral with the guide ztor-rning a casing pant ofz he rock drill, a laminated plate springon the rear end of the guide to support the rearend of the rock drill. v

In testimony whereof I have signed this specification. a, WAR F. TEBBY-

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