USRE14606E - Walter h - Google Patents

Description

I w. H. DIFFENDALL. STAY BOLT HEADING ATTACHMENT FOR PNEUMATIC HAMMERS APPLICATION HLED JULY [7. I9I8.

Reissued Mar, 1!, 1919.

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HTH m Y ment upon UNITED STATES PATENT OFFICE.

WALTER H. DIFFENDALL, OF HAGEB STOW'N,

ASSIGNMENTS, T0

MARYLAND, ASSIGNOR, BY MES'NE THE LIBERTY TOOL COMPANY, A CORPORATION OF MARY- STAY-IBOLT-HEADING ATTACHMENT FOB PNEUMATIC HAMMEBS, 8w.

Original No. 1,233,560, dated July 17, 1917,

filed July 17,1918.

To all whom it may concern:

Be it known that I, WALTER H. DIFFEN- DALL, a citizen of the United States, residing at Hagerstown, in the county of Washington and State of Maryland, have invented certain new and useful Improvements in Stay-Bolt-Heading matic Hammers, &c.', clare that the following is exact description thereof, had to the accompanying form part of this specification.

This invention is an improvement in staybolt heading attachments for pneumatic or fluid actuated hammers, which attachment enables the ordinary pneumatic hammers to be used for. heading stay-bolts, rivets, etc., in tural steel iron work.

The invention in the attachment ent No. 1,211,554, of January a full, clear, and reference being shown in myPat- 9, 1917, and the object of the invention is to enable the attachment to be handled as a unit so the parts thereof will not separate or drop apart when the attachment is etached from the hammer. I will explain the invention more fully with reference to the accompanying drawings in which;

Figure 1 is a conventional view of a pneumatic hammer showing the attachment applied thereto in section.

Fig. 2 is an enlarged sectional view of the attachment detached.

Fig. 3 is a top plan view of Fig. 2.

Fig. 4 is a detail view of the locking ring.

Referring to the drawings, A designates a pneumatic, or other fluid operated, hammer which may be of any suitable construction, and as shown has a barrel B in which is' a plunger P that is adapted to be operated by the fluid action in the usual manner.

, My novel attachment is adapted to be detachably fitted onto the lower end of the barrel B of such a hammer and as shown comprises a tubular cylindric casting 1, having a sleeve portion 1 on its upper end forming a socket adapted to receive the lower end of the barrel B; so that the attachment may be readily slipped ontothe end of the barrel'B and be retained in position thereon by the close fit, or by other suitable means. he attachment can be made to fit the end of Attachments for Pneu-- and I hereby de-.

drawings, which.

which as shown may countersunk sheet metal work and strue castingv and the partition particular is an improve- Speciflcation of Reissued Letters Patent. Rei ued Mar, 11, 1919 Serial No. 154,209, filed March 12, 1917. Application for reissue Serial No. 245,426.

the barrel of the hammer with which it is to be used without requiring any alteration in the barrel. I

On the lower end ofthis casting is an annular flange l fwhich surrounds or forms a recessin the lower'end of the casting, said recess being preferably considerably larger in diameter than the head of the bolt or rivet to be formed.

Within the casting 1 near the center thereof is a preferably removable partition 6, be exteriorly threaded to engage corresponding internal threads in p the casting. The partition 6 can be locked in position by any suitable means. As shown a metal locking ring 3 is arrange above the partition 6, one end of this ring being engaged with an opening 1 in the 6 may be chamthe ring, so that thering outwardly feredon its edge next to it will tend to spread against the casing.

The partition 6 has a central opening through which passes the shank 2 of a ram 2, which ram has a central flange 2" adapted to abut against the under side of the partition 6 and limit the upward movement of the ram 2. The lower end of the ram 2 is guided by an an ular bushing 5 which is fitted into the lower end of the casting 1, which asv shown has an internal flange or constriction 1 upon which bushing 5 is seated. i

The. bushin 5 ispreferably made of 'hardened. steel and has a pressed fit in the casting 1 but has a free working [it around the ram 2. Thisbushing 5 can be removed and replaced in case of excessive wear between it and theram. I p V The partition 6 is also preferably made of hardened steel and. has a working fit around the shank 2 of the ram and acts as a retainer, for the ram and also limits the extent of telescopic fit of the casting onto the barrel of the hammer. The bushing 6 may be removed and replaced when desired by means of an ordinary socket wrench which can be engaged with holes 6 in the top side of the bushing as shown.

A taper coil spring 4: is placed in the lower 2* on the ram and the bushspring fl: is not used as a flange and the constriction to return the ram to normal position.

7. A stay-bolt heading attachment for pneumatic haimners comprising a tubular body having a socket in its upper end; an approximately centrally disposed partition in said body, said partition having a central opening; an annular bushing in the lower end of the body; a ram having its lower end guided in said bushing and having a shank portion extending through and guided by the openin in the partition and having a flange beneat the partition, and a coil spring surrounding the ram and interposed between the flange and the bushing.

8. A stay-bolt heading attachment for pneumatic hammers comprising a cylindric body having a central partition provided with a central opening to guide the shank of a ram, a socket above the partition for the reception of the end of the hammer barrel, a constriction in the lower end of the body, a ram in the body guided in said constriction and having a shank extending through the opening in the partition, and a flange below the partition to limit its upward movement, and a taper coil spring interposed between the flange and the construction in the body to return the ram to normal position.

9. A stay-bolt heading attachment for pneumatic hammers comprising a tubular cylindric body having a socket in its upper end, and a constriction near its lower end, an approximately centrally disposed partition in said body; said partition having a central opening, an annular bushing fitted in the body at the constriction; and a ram having its lower end guided in said bushing and having a shank portion extending through and guided by the opening in the partition and having a flange beneath the partition, and a taper coil spring surrounding the ram and interposed between the flange and the bushing.

10. A stay-bolt heading attachment for pneumatic hammers, comprising a tubular body having a socket in its upper end, a constriction near its lower end, and approximately centrally disposed partition having a central opening; said body having perforations above the partition; an annular bushing fitted in the body at the constriction, a ram having its lower end guided in said bushing and having a shank portion extending through and guided by the opening in the partition and a spring for raising the ram, and a cushion in the body above the partition.

11. A stay-bolt heading attachment for pneumatic hammers comprising a tubular body having a socket in its upper end, a constricting flange near its lower end; an approximately centrally disposed partition removably secured in said body, and having a central opening; an annular bushing fitted in the body at the constriction; a ram having its lower end guided in said bushing and having a shank portion extending through and guided by the opening in the partition and having a limiting flange beneath the partition, a taper coil spring surrounding the ram and interposed between the flange and the bushing, and a cushioning washer in the body above the partition and surrounding the shank of the ram.

12. A stay-bolt heading attachment for pneumatic hammers, comprising a cylindric tubular body having a flange on its lower end surrounding a large recess therein, an internal constriction above this flange; a removable partition screwed into the body near the center thereof, said partition having a central opening; an annular bushing pressed into said body at said constriction; a ram having its lower end guided in said bushing and having a shank projectin through the opening in the partition and having a flange below the partition to limit its upward movement; and a coil spring surrounding the ram and interposed between said flange and said bushing to lift the ram.

13. A stay-bolt heading attachment for pneumatic hammers etc. comprising a tubular body having a flange on its lower end surrounding a large recess therein, an internal constriction above this flange; a removable partition screwed into the body near the center thereof, said body having a central opening; said body having perforations above the partition; an annular bushing pressed into said body and fitted on the said constriction; a ram having its lower end guided in said bushin and a shank projecting through the opening in the par tition and a flange-below the partition to limit its upward movement; a taper coil spring surrounding the ram and interposed between said flange and said bushing to lift the ram, and an annular cushioning washer Copies of this patent may be obtained for five cents each, by addressing the commissioner of Patents,

Washington, D. G. I

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