US1085896A - Guard for pneumatic hammers. - Google Patents

Description

H. N. EVANS, Sn. GUARD FORYPNEUMATIG HAMMERS.

APPLICATION FILED MAY 7, 1913.

Patented Feb.3, 1914.

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ATENT OFFICE.

EVANS, $13.. OF PHILADELPHIA, PENNSYLVANIA.

GUARD FOR PNEUMATIC HAMMERS.

Specification of Letters Patent. Application filed May 7, 1913.

Patented Feb. 3,1914.

Serial No. 766,038.

phia and State of Pennsylvania, have invented certain new and useful Improvements in Guards for Pneumatic Hammers, of which the following is a specification.

My invention relates to improvements in guards for pneumatic hammers, the object of the invention being to provide a guard which connects the rivet set with the handle of the hammer so as to prevent any possibility of the rivet set and the plunger being accidentally blown out of the hammer.

A further object is to provide an improved guard of this character which is adapted for use in connection with a closed handle or a revolver handle, and which embodies the maximum of strength and durability.

With these and other objects in view, the invention consists in certain novel features of construction and combinations and arrangements of parts as will be more fully hereinafter described and pointed out in the claims.

In the accompanying drawings: Figure 1 is a view in side elevation illustrating in full lines a pneumatic hammer of the closed handle type showing my improvements thereon and illustrating in dotted lines a handle of the revolver type. Fig. 2 is a plan view of my improved guard remeved. Fig. 3 is a fragmentary view in longitudinal section on an enlarged scale on the line 3 3 of Fig. 2. Fig. 4 is a ew in cross section on an enlarged scale on the line 4 -4 of Fig. 2, and Fig. 5 is a fragmentary view in longitudinal section through the handle engaging loop of the guard.

1 represents an ordinary pneumatic hammer having a removable rivet set 2 in one end, and provided with 3 at its other end.

Many hammers in general use have what are known as closed handles such as illustrated in full lines in Fig. 1, and others have what are known as revolver handles illustrated in dotted lines in Fig. 1, and my improvements are adapted for use in connection with either style of handle.

Rivet sets 2 are ordinarily provided with annular grooves 4 in which a wire 5 is clamped by means of a bar 6. The ends of wire 5 are flared outwardly forming hooks an ordinary handle 7' and they are projected through a slot 8 in bar 6. By reason of the shape of this slot 8. the hooked ends of the wire may be readily inserted when the bar is in alinement with the wire, but when the bar is moved to position at right angles to the wire, which is its operative position, the wire will be clamped around the rivet set as will be readily understood.

The bar 6 is provided with a slot 22 to receive a hooked end v23 of arod 9. This rod 9 projects through one end 10 of a coupling mem er 11. This coupling member 11 comprises a bar of spring metal bent at two points between its ends as shown at 1.2 forming the end 10 above referred to, and the two portions of said strip then extend in substantial parallelism for the desired distance. forming twobars 13. 13, which at their rear ends are curved as shown at 14 and 15 respectively forming a loop to engage the handle of the tool.

The member 15 is provided with a slot 16 through which a hook 17 on member 14 isadapted to spring, so that by pressing the members 14 and 15 toward each other, the hook 17 may be removed from the slot 16 and the loop may be opened, so that it may be readily inserted on a handle 3 of the closed type, and then the parts sprung into locked engagement as shown in Fig. 5.

The rod 9 above referred to as projecting through the end 10, also extends through a guide plate 18 and is screw-threaded at its end to receive a nut 19 against said plate 18. The plate 18 is provided with a slot 20 receiving one bar 13-and guided thereon.

A coiled spring 21 is located around rod 9 between plate 18 and the'end 10, so that it exerts a constant pressure on the rod tending to move the same toward the handle. This spring furthermore operates as a cushioning medium which prevents any breakage of the parts in the event air is turned on,

because it elastically holds the parts together, yet prevents any possibility of the rivet set being blown entirely out of the hammer.

My improvements may be readily assembled on the hammer and adjusted to fit various sizes of hammer by turning nut 19.

Various slight changes might be made in the general formand arrangement of parts describedwithoutdeparting from my invention, and hence I do not limit myself to the precise details set forth, but consider my:

self at liberty to make such changes and al= wrations as fairly fall within the spirit and scope of the appended claims.

llaring thus described my invention, what i claim as new and desire to secure by Letters Patent is:

1. A guard for pneumatic hammers, comprising a metal .strap bent between its ends, and at its ends detachably connected and forming a handle engaging loop, a rod movable through the other end of the strap and extending between the members of the strap, a device on the rod guided on the strap, a spring around the rod exerting rearward pressure on said device, and means connccting the rod to a rivet set, substantially as described.

2. A guard for pneumatic hammers, comprising a metal strap bent between its ends, and at; its ends detachably connected and 'lorining a handle engaging loop, a rod movable through the other end of the strap and extending between the members of the strap, a device on the rod guided on the strap, a spring around the rod exerting rearward pressure on said device, a hook on said rod, and a bar secured to a rivet set and detachably connected to said hook, substantially as described.

3. A guard for pneumatic hammers, comprising a metal strap bent between its ends, and at its ends detachably connected and forming a handle engaging loop, a rod movable through the other end of the strap and noeaeee set, substantially as described.

around the rod be 4-. A guard for pneumatic hammers, comprising a metal strap constituting a coupling member having parallel bars, and a handle receiving-loop at the free ends of said bars, said strap being of spring metal and constructed to look about the handle, a plate having a slot mounted to slide on one of said bars, a rod projecting through the other end of the coupling member and through said plate, a nut screwed on said rod against the plate, a coiled spring around the rod between the plate and the end of the coupling member, a hook on the end of said rod, and means detachably connected to said hook and adapted to be secured to a rivet set, substantially as described.

In testimony whereof I have signed my name to this specification in the presence of two subscribing witnesses.

HARRY N. EVANS, SR.

Witnesses:

CHAS. E. lPor'rs, MARY E. DI'I'IUS.

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