US1211554A - Stay-bolt-heading attachment for pneumatic hammers. - Google Patents

Description

W. H. DIFFENDALL.

STAY BOLT HEADING ATTACHMENT FOR PNEUMATIC HAMMERS APPLICATION FILED SEPT. 20, HHS.-

Patented J an. 9, 1917.

ibneooeo WALTER, H. DIFFENDALL, OF HAGERSTOVJN, MARYLAND.

' STAY-BOLT-I-IEADING ATTACHMENT FOR PNEUMATIC HAMMERS.

Application filed September 20, 1915.

To all whom it may concern:

Be it known that I, l VALTER H. DIFFEN- DALL, a citizen of the United States, residing at Hagerstown, in the county of lashington and State of -Maryland, have invented certain new and useful Improvements in Stay-Bolt-l-leading Attachments for Pneumatic Hammers; and I hereby declare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawings, which form part of this specification.

-This invention is a novel stay bolt heading attachment for pneumatic or fluid actuated hammers and its object is to enable an ordinary pneumatic hammer to be used for heading stay bolts, countersunk rivets, etc., in boilers and tanks, and on structural steel and iron work.

The invention consists in a novel attachment for ordinary pneumatic hammers whereby more perfect heads can be made, marking or injuring of the sheets will be prevented, and more work can be performed in. a certain time than by present methods, thus economizing both time and labor.

I will explain the invention in connection with the accompanying drawings in which Figure 1 represents a detail sectional elevation of a pneumatic hammer with the attachment applied. Fig. 2 is an enlarged side view of the attachment detached. Fig. 3 is a vertical section through Fig. 2. Fig. l is a detail plan view indicating in dotted lines the manner of using the attachment in heading a stay-bolt.

The attachment may be used in connection with a fluid actuated hammer of ordinary type, or of any preferred construction. As indicated in the drawing an ordinary pneumatic hammer A is shown; said hammer having a barrel B within which works a plunger]? in the usual manner. My novel attachment is adapted to be detachably fitted to the lower end of the barrel B, and, as shown, comprises an approximately cupshaped 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 onto the end of the barrel B and be retained in position thereon by the close fit, or by other suitable means. The attachment being slipped over the end of the barrel does not require any alteration in the barrel. On the bottom of this casting is an annular Specification of Letters Patent.

Patented Jan. 9, 1917.

Serial No. 51,654.

flange 1 which surrounds or forms a-recess in the bottom of the casting considerably larger in diameter than the head of the bolt or rivet to be formed. The casting is also provided with an axial opening or bore 1 preferably having an inwardly projecting flange l at its upperend, and the bore 1 accommodates the head 2* of a ram 2 which extends into the barrel B and is adapted to be struck by the plunger P.

In use the recessed lower end of the casting 1 is placed over the head end 1 of a bolt or rivet, R, to be headed, and the casting moved eccentrically of such bolt until the flange i on the lower edge of the casting engages the edge of the head so that the ram 2 will be set eccentric to the rivet as indicated in Figs. 3 and 4, and when the hammer is in operation and as the plunger is reciprocated the casting is turned around the bolt or rivet, so as to move the ram 2 orbitally around the rivet head as indicated in dotted lines in Fig. 4, and the ram hammers down the head, shaping it to the form indicated in Fig. 3.

The attachment can be turned around the bolt head with one hand keeping the inner edge of the flange 1- against the edge of the bolt end while the hammer is held with the other hand and the operating valve worked in the usual way. The hammer could itself be also moved around the bolt while flange it keeps the ram in proper position relative to the bolt.

Fig. 3 shows in dotted lines the action of the ram upon the end of the stay bolt, 1" indicating the head formed on the bolt. In 'Fig. 4: the head 1 of the bolt is shown in dotted lines, and the dotted circle 3 indicates the orbital path through which the attachment is moved during the heading operation. No special make of pneumatic hammer is required with this invention, it can be readily adapted for use with any ordinary pneumatic hammer without any alteration in the latter. The orbital movement of, the attachment around the aXis of the bolt or rivet While the hammer is operating results in producing a round even head on the bolt, and no strokes are lost or wasted on the sheets, and the work is therefore performed in a superior manner and in the minimum time. The attachment also prevents the ram from striking and injuring the metal sheets, and confines every stroke of the ram to the head of the bolt or rivet. The attachment also protects the workman against injury as it guards his fingers and prevents them being caught between the ram and hammer barrel while the tool is in use, and he can safely manipulate the attachment with one hand while holding the hammer with the other.

A hammer with such attachment can be very easily manipulated and its work can be properly performed in positions and places where it would be diflicult or impossible to use an ordinary pneumatichammer alone.

The attachment will enable tight well formed heads to be formed on stay bolts and rivets, and is particularly designed and adapted for use in heading stay bolts which are driven cold while ordinary rivets are driven hot. By properly shaping the head end of the ram 2 it can also be adapted for countersinking the ends of rivets or bolts and the like.

That I claim is:

An attachment for pneumatic hammers, comprising a casting having a sleeve portion on its upper end adapted to detachably fit over the end of the hammer barrel, an

Copies of this patent may be obtained for axial bore of less diameter for the passage of the shank of a ram, and a flange at the upper end of the bore to limit the upward movement of the ram, and a circumferential flange on the lower end of the casting forming a guide to keep the attachment in proper position relative to the object being operated upon; with a ram having a head slidably fitted in said bore below the flange at the upper end thereof, and a shank extending above said flange and adapted to be engaged by the hammer-plunger; said attachment being adapted to be placed eccentrical to the bolt or rivet with the lowermost flange against the head of the rivet and then moved orbitally around the head while the hammer is in operation.

In testimony that I'claim the foregoing as my own, I affix my signature in presence of two witnesses.

Witnesses:

C. A. LITTLE, BERTHA F. LUDWIG.

five cents each, by addressing the Commissioner of Patents, Washington, D. G.

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