US1647201A - Broaching attachment - Google Patents

Description

Nov. 1, 1927. 1,647,201

R. H. SMICKLE BROACHING ATTACHMENT Filed March 3. 1926 I/ f/V' v 2 TORA J, R R05/ onaNVEI'/ I Y* 5 K cu/ Hfs AT ORNEYk Patented Nov. 1, 192?.

TES`

#RAYMOND H. SMIOKLE, ori-BELVIDERE," NEW JERSEY, AssrGNoE To rNeEnsoLL-RAND COMPANY, O F JERSEY CITY, NEW JERSEY,

CORPORATION OE NEW'JERSEY. o

BROAOHING ATTACHMENT.

applicati@ mea March 3, i926. serial No. 91,965;

Thisinvent'ion relates to fluid actuated rock drills, butr more particularly to a broaching attachmentwhich may be substi-` tuted for the ordinary front head of a fluid actuatedrock drill of thehainmer type.

rIh'e objects ofthis invention are to enable a flat rectangular broachingtool to be held and guided in a rock drill in an improved and simplified manner, and to. enable .the broaching tool tobe 4quickly vinserted into Y the front head of the drill and removed therefrom. l" n Other objects will be in lpart Obvious Vand v in part/pointed out hereinafter.

' head D respectively.

The invention consists of the combination of elements, arrangementof parts .and features of construction substantially as hereinafter-described and V,more particularly pointed out in the appended claims and illustrated t in the accompanyingv drawings, in which- Figure l is an elevation partly in secti-on of the front end of a rock drill equipped with an attachment constructed in accordance with the practice of the invention,

Figure 2 is af sect'onal elevation taken through Figure 1 on the line 2-2 looking in the direction of the arrows, and

'Figure S is a transverse view in .section taken through Figure 2 on the line-3 3 looking in the direction of the arrows.

Referring to the drawings, the invention is shown embodied in arock drillof which only a front portion of a cylinder A is shown. A bushing B inserted in the front end of .the cylinder A forms a head for the cylinder and also acts as a guide for the noseor extension C of t-he piston (not shown) reciprocable inthe cylinder A.

In accordance with the present invention, an attachment or front head D is supported by the cylinder: Aj and preferably secured thereto by means of a pair of cushioned side bolts E which extend through lugs F and Gr carried by the cylinder A andthe front The bolts E are pro-- vided with springs H. which bear against the lugs G of the front head D to hold said front head yieldably Within the cylinder A. ,f

The rearward portion of the `front head D is preferably of generally cylindrical forniation and is provided with a bore J which acts as a guide for'an anvil block K interposed between the piston nose C anda broaching tool L for transmitting the blows of the Vhammer piston to the broaching tool.

The rearward portionof the bore J'is preferablyv enlarged somewhat for the reception Iof a bushing O which forms a removable vguide for the extension C of the hammer piston'. A y

. The frontend of the front head D is preferably rectangular as at P and'is provided with 'a rectangular recess Q having parallel walls and into one side of which recess is a1'.- ranged a jaw R preferably held in fixed position by'means of suitable screws S. The jaw R is'seated on a front end'wall Dof the front head D and in this instance is provided at its linnermost end with a projection portion T adapted to extend into a groove.

U formed .in the side of the broaching tool L near the rearward end thereof. Disposed on the opposite side of the recess' Q, is another jaw V which, like thejaw R, is also provided with an inwardly extending projec tion- T near its rearward end toeXtend into a groove 1V formed on the broaching'tool L opposite tothe groove U. j W y y In order that the broaching ltool Lrnay be quickly released from the front head B, the jaw,V is adapted to be yactuated slidablyv on the wall D toward and away from the breaching tool L. To obtain this slidable movement of the jaw V, awedge-like` member lX is disposed in the recess Q, to

slide in a plane parallelrto the longitudinal axis of the-front head and to cooperate slidably with a. tapered surface Y of the jaw V. The wedge X is provided in this instance with a T-slot Z which engages a yT-shaped projection Zn formedlongitudinally ofy the jaw V on the tapered side Y. The wedge X is preferably considerablyvshorter than the jaw V so'that it. will becapable of a. vwide range of movement in a longitudinal direction in the recess Q. Any suitable means. may be yprovided for locking the wedge X in placed position. In the present instance a bolt c is inserted 'throughk kthe wedge and lextends through a slot (l formed longitudinally Vof the front head and carries on its outer end a the insertion of the breaching tool L into said front head. The opening z. is preferably of ample width so that the jaws R and V and the wedgeX may pass freely therethrough in assembling or disassembling the D by which it is supported. r

In Figure 2 the adjustable jaw V is shown in its tool engaging position. In this position of the jaw V, it will be noted that the guiding faces y and g engage the sides of the broaching tool, it being intended in this position of the jaw V that there be only sufi'icient clearance between the jaw and the broaching tool to permit free reciprocation of said breaching tool. If, however, it be found desirable to provide greater clearance between the guiding surfaces of the jaws in the broaching tool, the wedge X may be drawn slightly rearwardly in the rece-ss Q. Movement of the wedge in this direction will have-the effect of withdrawing the jaw V.

After the jaw V has been moved to the desired position, the nut e may be tightened on the bolt c and the jaw will be held firmly in position.

To release the breaching toolL, the wedg X may be moved krearwardly along the tapered side Y of the jaw V until a space exceeding the thickness of the tool is formed between the projections 'l of the jaws, whereupon the breaching tool L may be removed from the front head. After the jaw V has been moved to its releasing position, the nut e may be tightened on the bolt c and the jaw V will remain in releasing position readyv for the insertion of another broaching tool.

By means of this invention the breaching tool may be quickly inserted into the front head or removed therefrom in practically the same manner as a drill steel may be inserted in the ordinary type of front head.

The parts, in this instance, the jaws R and V, which serve as guides for the broaching tool L may be readily and cheaply replaced and owing to the fact that the jaw V is adjustable, any wear which may occur on the jaws may be quickly compensated for by merely advancing the jaw V in the direction of the broaching tool.

I claim: l

l. The combination with a rock drill having a cylinder, of an attachment adapted to be secured to the cylinder, said attachment having ay rectangular' recess, a jaw secured in fixed position in one side of the recess, and a second jaw adjustable in the opposite side of the recess to cooperate with the first said jaw for loosely guidinga Vbreaching tool and for retaining such broaching tool in the attachment, said jaws being supported by the front end of the attachment." ,Y

2. The combination with a rock drilllhaving a cylinder, of anattachment adapted to be secured to the cylinder, saidattachment having a front end wallwith a rectangular recess, said recess having parallel walls, a jaw secured in fixed position in one side of the recess, said jaw being supported by the end wall, a second jaw in the opposite vside of the recess slidable on the end wall and means slidable longitudinally in the attachment for imparting transverse movement to the second said jaw.

3. The combination with av rock drill having a cylinder, of an attachment adapted to be secured to the cylinder, said attachment having a recess near its front end, a jaw secured iixedly in one side of the recess to forni a guide for one side of a broaching tool adapted to reciprocate loosely in the attachment, a slidable jaw in the other side of the recess to form a guide for the op' posite side of such breaching tool and having a tapered side, a wedge interlocked with the slidable jaw, said wedge being slidable in a plane parallel. to the longitudinal axisl of the front head, and slidable on the tapered side for actuatin'gsaid slidable jaw transversely in the front head, and means including a bolt and a nut .for lockingv the wedge and the slidable jaw in placed position.

In testimony whereof I have signedthis specification.

RAYMOND H. SMCKLE.

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