US2265427A - Implement retainer - Google Patents

Description

e. H. FUEI-IIRER 2,265,427

IMPLEMENT RETAINER Filed Nov. 2, 1340 INVENTOR HIS ATTORNEY Patented Dec. 9, 1941 IMPLEMENT RETAINER George H. Fuehrer, Phillipsburg, N. J assignor to Ingersoll-Rand'Company, New York, N. Y., a corporation of New Jersey Application November 2, 1940, Serial No. 363,975

Claims.

This invention relates to rock drills, and more particularly to implement retainers for rock drills in which the working implement and the elements actuating it are capable of reciprocatory movement independently of each other.

One object of the invention is to assure the retention of the working implement in the rock drill.

Another object is to enable the working implement to be quickly inserted into or removed from the rock drill.

Another object is to equip the rock drill with a rugged retaining device capable of fully withstanding the severe usage to which it is subjected in practice.

Still another object is to minimize the number of parts that will be subjected to the wear incident to the impact of the working implement.

against the retaining device.

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

In the drawing accompanying this specification and in which similar reference numerals refer to similar parts,

Figure l is an elevation, partly in section, of the front end of a rock drill equipped with a steel retainer constructed in accordance with the practice of the invention,

Figure 2 is a transverse view taken through Figure 1 on the line 2-2, and

Figure 3 is a side elevation of the front end of a rock drill and the implement retainer.

Referring more particularly to the drawing, designates, in general, the front end of a rock drill comprising a front head 2| having a bore 22, an intermediate portion 23 of which acts as a guide for the shank 24 of a working implement 25.

At the rearward end of the intermediate portion 23 of the bore 22 is an enlarged recess 26 into which the free end of the shank 24 extends to receive the blows of a hammer piston 21. The front end of the bore 22 is likewise in the form of an enlarged portion 28 to permit the ready passage therethrough of a collar 29 carried by the working implement and adapted to seat against the bottom 30 of the enlarged portion 28 to limit the distance that the shank 24 may extend into the recess 26. The enlarged portion 28 is of ample depth so that the collar 29 is capable of a considerable degree of movement longitudinally of the front head without moving out of the bore.

In accordance with the practice of the invention, the front head 2| is provided with an aperture 3| that opens into the enlarged portion 28 of the bore to receive a retaining member 32 that extends loosely through the aperture 3| into the path of the collar 29. The front end of the aperture 3| serves as a seating surface 33 for the retaining member 32 and is inclined from the bore 28 as is also the retaining member 32.

On the outer end of the retaining member 32 is a handle 34 that is integral with the retaining .member, and the portion of the handle 34 adjacent the retaining member is suitably guided by guide members 35 lying on the opposite sides of the aperture 3| and extending longitudinally along the side of the front head 2|. The bottom of the space between the guide members 35 serves as a seating surface 36 for the portions of the handle lying immediately forwardly and rearwardly of the retaining member 32. It is off-set with respect to the side of the front head So that the portion of the handle 34 lying above the guide members 35 will be capable of a considerable degree of rocking movement toward the front head before contacting with the side thereof when the handle is actuated to withdrawn the retaining member 32 out of the path of the collar 29.

The retaining member and the handle are imperforate and, while intended to describe a rocking movement, are not dependent for such movement upon a fixed pivot. The retaining member 32 is both slidable upon and tiltable with respect to the seating surface 33. These movements are induced when moving the retaining member out of the retaining position, as by pressure applied to the handle 34 to move the handle toward the front head, as illustrated more particularly by the dot and dash line showing of the handle, by a fulcrum 31 at the upper end of the seating surface 36, said fulcrum. 31 being,

in the present instance, a corner resulting from the angular relationship of the seating surface 36 and the adjacent surface of the front head 2|.

The retaining member is held in assembled relationship with the front head by a spring 38 in the form of a loop that embraces the handle 34 and the front head, these elements having notches 39 and 43, respectively, to receive portions of the spring. The notches are located in different transverse planes forwardly of the fulcrum 31 and the notch 39 lies in a plane between the fulcrum and the transverse plane of the notch 40.

In the form shown, the spring 38 consists largely of straight portions that are arranged angularly with respect to each other to conform,

roughly, to the contour of the front head. More specifically, the spring has a straight portion 4| to engage the notch 39 in the handle, and from the straight portion 4| diverge other straight portions 42 that are joined with inwardly bent portions 43 to converging wings 44 having inturned ends 45 that lie in the notch 40 and cooperate therewith to form a pivot for'the spring 38.

In order that the spring may at all times exert a suitable tension upon the retaining member, the wings 44 are seated upon inclined seating surfaces 46 on the side of the front head and said seating surfaces are of such degree of in T clination that the wings 44 may readily slide thereon to permit the necessary degree of extension of the spring when rockingthe handle 34 from one limiting position to the other and,

to secure the retaining member to the front head.

2. In an implement retainer, comprising in comprising in combination with a front head and a working implement having a collar, a seating surface on the front head, a retaining member seating upon the seating surface and extending into the pathv of the collar, a handle on the retaining member seating against the front head, a fulcrum on the front head for the handle, and a spring on the front head embracing the handle and movable to the opposite sides of the fulcrum for holding the retaining member in the retaining and releasing positions.

again, to slide freely upon the seating surfaces 5 upon contraction of the spring in the limiting positions of the handle.

If desired, ribs 41 may be formed on the side of the front head and such ribs may diverge'from the notch 40 to form a substantial protection for the spring againstdamage.

In the operation of the drill, whenever it is desired to remove the working implement from the front head the retaining member 32 is rocked out of the retaining position by pressure. applied to the upper end of the handle 34. The handle 34 is then rocked about the fulcrum 31 to a position in which it rests against the side of the front head. This movement 'of the handle will cause the portion of the spring 38 lying in the notch 39 to be shifted above the fulcrum 3'! and the spring will then hold the retaining member in the releasing position.

After a working implement has again been placed in the front head the handle 34 is rocked outwardly and the retaining member 32 is then returned to its retaining position and held thus by. the spring 38 which will then again lie forwardly of the fulcrum 3Tand hold the handle 34 firmly'against the seating surface 36.

I claim: I

1. In an implement retainer, comprising in combination with a front head and a working implement having a collar, a seating surface on the front head, a retaining member seating upon the seating surface-and extending intothe path of the collar, a handle on the retaining member, a fulcrum on the front head for the'handle, and spring-means pivotally attached tothe front head acting against the handle and movable across the fulcrum to hold the retaining member in the retaining and releasing positions and 3. In an implement retainer, comp-rising in combination with a front head and a working implement having a collar, a seating surface on the front head, a retaining member seating upon the seating surface and extending into the path of the collar, a fulcrum for the retainer, and a spring embracing the front head and theretaining member and being shiftable toithe opposite sides of the fulcrum accordingly as the retaining member is rocked about thefulcrum for holding the retaining member in the retaining and releasing positions" a 4. In an implement retainer, comprising in combination with a front head and a working implement having a collar, a retaining member extending into the path of the collar, a handle on the retaining member,. a fulcrum on the front head for the handle, and a spring embracing the front head and. the handle having a portion in engagement with the front. head and another portion connected to the handle and swingable therewith relatively to the fulcrum for holding the retaining member in the retaining and releasing positions.

5. In an implement retainer, comprising in combination with a front head and a working implement having a. collar, an. inclined seating surface on the front head, guide members on the opposite sides of the inclined seating surface extending longitudinally of the, front head; a

face and extending into the path of the collar,

a handle on the retaining member lying between the guide members, a fulcrum for the handle, and

a spring interlockingly engaging the fronthead embracing the handle and being swingable with the handle about the fulcrum for holding the retaining member in the retaining and releasing positions and to secure the retaining member to the front head.

GEORGE H. FUEHRER.

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