US1646090A - Broaching attachment - Google Patents

Description

1927. Oct c. c. HANSEN BROACHING ATTACHMENT 2 Shaaeizs-Sheet Filed Sept. 1926 INVEN TOR.

CZQ'Z'IML awsezz.

HIS ATTVEY Patented Oct. 18, 1927.

UNITED STATES r 1,646,090 PATENT OFFICE.

CHARLES C. HANSEN, OF EASTON, PENNSYLVANIA, AS SIGNOB '10 INGEBBOLIa-RLNID COMPANY, OF JERSEY CITY, NEW JERSEY, A CORPORATION OF NEW JERSEY. I

BBOACHING ATTACHMENT.

Application filed September 23, 1926. Serial 1T0. 137,801.

This invention relates to rock drills, but more particularly to a breaching attachment for fluid actuated rock drills of the hammer type.

The objects of the invention are to enable a broaching tool to be suitably guided during the broaching operation, to facilitate the insertion of the attachment into the tool and the removal therefrom, and to render the attachment capable of accommodating different types of broaching tools.

Other objects will appear hereinafter.

The invention consists of the combination of elements, features of construction, and an rangement of parts substantially as hereinafter described and more particularly pointed out in the appended claim and illustrated in the accompanying drawings, in wh1ch Figure 1 is an elevation in section of the front end of a rock drill equipped with a broaching attachment constructed in accordance with the practice of the invention,

Figure 2 is a side view of the attachment partly broken away and partly in section illustrating the manner in which the broaching attachment may be secured to the cylinder of the rock drill,

Figure 3 is a transverse view taken through Figure 1 on the line 3-3 looklng in the direction of the arrows,

Figure 4 is a similar view taken through Figure 2 on the line 44,

Figure 5 is a view similar to Figure 1 illustrating the manner in which a fiat rectangular broaching tool having a rectangular head may be supported by the attachment, and

Figure 6 is a view similar to Figures 1 and 5 showing the manner in which a round headed broaching tool is supported by the attachment.

Referring to the drawings, the invention is shown embodied in a rock drill in which only a front portion of a cylinder A is shown. Within the cylinder A is a reciprocatory hammer piston B adapt-ed to deliver blows to an anvil block G. A front cylinder washer D at the front end ofthe cylinder forms a closure therefor and also acts as a guide for the anvil block C.

The attachment or front head E is supported by the cylinder A and preferably secured thereto by means of bolts F which extend through flanges G and H of the c linder A and the front cylinder washer respectively and through an end wall J of the front head E, nuts K being provided for the bolts F for clamping the cylinder and the attachment securely together. In the present instance, the attachment E has an inte al side wall L and has end walls 0 secure to the inner face of the wall L by bolts or screws P, thus leaving one side of the attachment open as at Q.

Adjacent that end of the attachment wh ch 1s secured to the front" cylinder washer D is formed a lug R which acts as a bearmg for a cover S adapted to lie against the edges of the end walls 0 and has rearwardly extending arms T which bear against the ends of the lugs R. Apertures U are formed through the lug R and through the arms T for the reception of a pin V which acts as a pivot for the cover S. In this way is formed a closure for the open side Q for the attachment E.

Any suitable means may be provided for clamping the cover S securely in operative position. In the present instance I-bolts W pivoted to the wall L extend through slots X in the cover S and in the side walls 0 and are provided with nuts Y which may be turned against the cover S after said cover has been closed.

Disposed on the inner surfaces of the wall L and the cover S are cheek plates Z of preferably the same width as the 's ace between the end walls 0. These chee plates are spaced with respect to each other to form a guideway b therebetween and are preferably secured to the wall L and the cover S by means of bolts 0. In order to protect the bolts 0 against excessive strain caused by occasional impact of the anvil block C against the cheek plates, the cheek plates are provided with transverse keys or tongues d which extend into slots 6.

The guideway b as formed by the end walls 0 and the inner surfaces of the cheek plates Z is of rectangular cross sectional area 1 adapted more particularly for accommodating and loosely guiding flat rectangular broaching tools 7 of the type illustrated in Figure 5. As is well known, there are a variety of broaching tools of different designs particularly with respect to the shank, a few of these types being illustrated in the drawings. The broaching tool 9 illustrated in Figures 1 to 4 inclusive is of a well known type in which the body portion h is of flat rectangular cross sectional area and the shank of which ma be either of hexagonal or cylindrical s ape. In order to render the present attachment capable of accommodating tools of this type, longitudinal grooves 70 are formed on the inner surfaes of the cheek late Z for the reception of a shank o o the broaching tool g. These grooves 70 may extend from the rearward end of the cheek plates to recesses p formed near the front ends of the cheek plates and into which recesses ma extend a collar 9 carried by the tool g. T e recesses p are of such length as to permlt a considerable range of movement in a. longitudinal direction of thetool g and the ends of the recesses 39 are adapted to cooperate with the collar 9 for limitmg the movement of the tool with respect to the cheek plates.

Means are also provided on the cheek lates for preventing ejection of thetool f illustrated in Figure 5. To this end shoulders 1' are formed across the inner surfaces of the cheek plates Z to cooperate with shoulders 8 formed on the rearward end of the tool f.

In Figure 6 is illustrated a tool t having a rectangular body portion and carrying at its rearward end a c lindrical head it against which the blows o the anvil block C are delivered. In order to prevent ejection of this type of tool from the attachment, arcuate recesses '11 are formed in the rearward end of the cheek plates Z and -the end walls w of these recesses 12 act as stops for the head a.

In ractice whenever it is desired to change broaching tools, the nuts Y on the bolts W may be partly unscrewed to permit the bolts to be rocked out of the slot X. The cover S may then be oscillated about its pivot as illustrated by the dot and dash lines in Figure 1 and the broaching tool may be removed from the attachment. After another tool has been inserted in. the attachment the cover 5 may again be clamped to the side of the attachment.

The present invention is not limited in its use to one particular type of broaching tool but will accommodate broaching tools of different designs. This is particularly desirable in broaching operations in which various types of broaching tools are in use and will eliminate the expense of providing a separate broaching attachment suitable for each particular ty of broaching tool. A further desirable ligature of this invention is, that owing to the manner in which the one side of the cover S is pivoted to the attachment, very little time is required to change the broaching tool.

I claim:

In a. broaching attachment adapted to be secured to the cylinder of a rock drill, the combination of a front head having an open side, a cover pivoted to the front head forming a closure for the open side, cheek plates secured to the front head and the cover spaced to form a rectangular uideway Ior loosely guiding a broaching tool, said check plates having recesses in their inner surfaces near the front end of the guideway to receive a broaching steel collar, said check plates also having longitudinal grooves in their in ner surfaces extending from the recesses to the rearward ends of the cheek plates for the reception of a broaching tool shank, and I-bolts pivoted to the front head for clamping the cover to the front head.

In testimony whereof I have signed this specification.

CHARLES C. HANSEN.

Images