US487692A - Power-hammer - Google Patents

Description

(No Model.) 2 Sheets- Sheet 1.

A. BEAUDRVY. POWER HAMMER.

No. 487,692. Patented Dec. 6, 1892.

IIIIIIIIII Il Il FTTH WITNESSESI (No Model.) 2 Sheets-Sheet 2.

A. BEAUDRY.

- POWER HAMMER.

No. 487,692. Patented Dec. 6, 1892.

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ALEXANDER BEAUDRY, OF BOSTON, MASSACHUSETTS, ASSIGNOR TO THE BEAUDRY TOOL COMPANY, OF PORTLAND, MAINE.

POWER-HAMMER.

SPECIFICATIGN forming part of Letters Patent No. 487,692, dated December 6, 1892.

Application filed February 8, 1 8 92.

To all whom iff/may concern.-

Be it known that I, ALEXANDER BEAUDRY, a citizen of the United States, and a resident of Boston, Suffolk county, Massachusetts, have invented certain Improvements in Power- Hammers, of which` the following is a specilication. v My invention relates to improvements in power-hammers having facilities for varying the force of the blow to suit the work in hand; and its object is to produce a cheap and eflicient hammer of this class which will occupy a limited space and have good weariu g qualities.

My invention will be fully described hereinafter, and its novel features carefully defined in the claims.

In the accompanying drawings, which serve to illustrate my invention, Figure l is a sectional side elevation of the hammer, the hammer-frame being substantially in mid-section at its upper part to better disclose the mechanism which actuates the hammer-head. The upper part of the hammer-head is also in section. mer. Fig. 3 is a plan of the hammer. Fig. 4. is a sectional detail view of the crank wheel and pin.

The frame A of the hammer is constructed, by preference, of cast-iron, and` it may be made in one piece or integral.

A is the portion of the frame in which the anvil Bis mounted, and A2 is the overhanging portion of the frame in which the hammer-head C plays up and down over the anvil in suitable guides. The other or main part of the frame is substantially hollow, and in this hollow is mounted the mechanism by which the proper motion is imparted to the hammer-head.

D is the main shaft, mounted at the base portion of frame A in a bracket A3 thereon, and E is a driving-pulley keyed on the said shaft.

On the shaft D, within the hollow of the frame A, is a crank-wheel F, from which a reciprocating movement is imparted to the hammer-head through the medium of mechanism I will now describe. G is an upper link pivotally mounted at g in the frame on a transverse pin, and G is a similar lower Fig. 2 is a rear elevation of the ham-v Serial No. 420,635. (No model.)

ythe free end of the link Gand at itslower end Ato the free end of link G. The lower link is coupled to the crank-pin fof the crank-wheel 3F by a connecting-rod I. Thus when the main shaft is rotated the rod I imparts a vibrating up-and-down motion to the tie-barH. J is the hammer arm or helve. This arm plays in an aperture in the front of the main frame, and its front endj, which is flattened and has a central aperture, enters a hollow in the hammer-head C, where it is embraced from above and below by rubber cushions c c in the hollow of the hammer and held in place by a pin c', preferably of hard wood, which passes down through holes in the hammer-head, in the cushions c c, and in the end of the helve. At its other or rear end the helve has a T-shaped head j', which is parti-circular or convex where it bears on the front upright face of the tie-bar H, and is provided at the two eX- tremities with eyes or pairs of apertured lugs, whereby it is loosely coupled bypins [i2 to two eyebolts h h, which play'loosely through apertures in the tie-bar H and have nuts and washers on their rear ends back of the bar H. On each eyebolt h, between the bar II and the nut or washer on the eyebolt, is a rubber cushion h. Preferably I provide the bar H with recesses in its rear face to receive the cushions 71 and provide each eyebolt with cup-washer h2 to take over the outer end of the cushion and receive the chaling and wear from the nut h3 on the bolt. By tightening up the nuts the desired tension of the cushions h may be attained. Then the shaft- D is set in motion, the tie-bar H receives a rapid up-and-down reciprocating movement, modied by the swing of the links G and G about their pivots. This variation from the vertical by the bar H as it moves to and fro is irnparted to the hammer-belve J, and the movements of this helve will be further modified by the cushions h at the back of bar H and IOO the cushions in the hollow of the hammerhead. The convex face of the head .7 of the helve rolls or rocks (more or less) on the face of the bar H during the operations of the hammer, thus overcoming to some extent the inertia ot the hammer-head at the beginning of the return stroke by the resiliency of the cushions h'. To relieve the lateral (vertical) strain on the eyebolts which secure the helve to the bar H, I prefer to pass a stud through the bar H from the back about midway between the eyebolts and allow its rounded end to loosely engage a corresponding recess in the convex face of the head ,7" of the helve. This pin takes the weight of the parts to some degree oit from the eyebolts.

To counterbalance the weight of the hammer head and helve and put the mechanism more nearly in equilibrium, I provide a counter-spring. To a rear prolongation of the link G', back of the pivot g', I couple a springcasing L. (Represented as partly broken away in Fig. l.) In this casing is placed a spiral spring M, through which passes a spring-rod N, which is adjustably coupled at its lower extremity to a bracket n on the frame A. At

its upper or inner end this rod N has a head y n', which takes over the upper end of the compression-sprin g M. A nut n2 on the lower end of the rod N allows the spring to be put under any tension desired. By thus counterbalancing the head ofthe hammer I avoid the use of a [1y-wheel and am enabled to stop the hammer almost instantly by means of a brake. I employ, by preference, an ordinary treadle-brake, the shoe of which bears 011 the broader face of the pulley-rim; but I have not deemed it necessary to illustrate the brake in the drawings, as it posseses no novel features. The counterbalancing-spring may be of rubber, as it is a compression-spring, and the amount of compression during the descent of the hammer will not usually be more than five-eights of an inch. The part A' of the frame in which the anvil is set may, and preferably will, be cast separately from the main portion A and be bolted orscrewed firmly thereto. The hammer-head C is prevented from turning axially in its guides, it being c) lindrical in form, by means of a groove extending longitudinally of the head and a spline m, (seen in Fig. 3,) which engages ihe groove in the hammer-head and a groove or keyway in the part A2 of the frame in which the hammer-head is mounted. The spline m is held in place by a suitable screw or screws o.

Cushion-springs of wireorof metal and rubber combined may be employed in lieu of the rubber springs shown. It will be obvious,

also, that an eccentric for operating the hammer may be employed in lieu of the crank described.

As herein shown, the crank-pin fis in the form of a stud projecting from a dovetail blockf', which is mounted in a radial dovetail groove in the face of the crank-wheel F and has a nut and washer on its outer end. On the crank pin is the sleeve f2, which is clamped endwise between the face of the wheel F and the nut. This serves to clamp the block f' wherever it may be set. The end of the connecting-rod I turns about the sleeve f2. This construction enables the throw of the crank to be varied within limits by merely loosening the nut f3 on the crank-pin and shifting the block f'. Fig. 4 is a sectional view, which clearly illustrates this construction.

Having thus described my invention, I claiml. In a power-hammer, the combination, with a frame, a hammerhead mounted to play in guides, and a main power-shaft, and crank, of the links G G', pivotally mounted in the frame, the tie-bar H, coupled at itsrespective ends to the free ends of said links, the connecting-rod which couples one of said links to the crank, and the helve J, having a cushioned connection with the hammer-head at one end and a cushioned connection with vthe tie-bar H at its other end.

2. In a power-hammer, the combination, with a frame, a hammer-head mounted to play in guides therein, a power-shaft, and a crank on said shaft, of the upper link G,piv otally mounted at its front end in said frame, the lower link G', pivotally mounted at its rear end in said frame, the upright tie-bar H, coupled at its respective ends to the free ends of said links, the connecting-rod which couples the crank to the lower link G', the helve J, having its front end embraced between cushions in the hollow of the hammer-head, the said cushions, the tiebolts which connect the convex T-shaped head of the helve to the bar H, the cushions on said tie-bolts, and the counter-spring for the hammer head and helve.

3. In a power-hammer, the combination, with a frame, a hammer-head which is mounted in vertical guides therein, an upright bar H, connected to the frame by links, the said links, and means for imparting to said bar an up-and-down motion, of a helve J, provided with a convex T-shaped rear end having apertures at its extremity, eye/bolts which couple the helve to the bar H and hold it firmly up thereto, the elastic cushions on said eyebolts, the stud 7c in the bar H, which engages a recess in the convex face of the helve, the cushions in the hollow of the hammer-head and embracing the end of the helve, and the pin which couples together the helve, hammerhead, and cushions.

In witness whereof I have hereunto signed my name in the presence of two subscribing witnesses.

ALEXANDER BEAUDRY.

Witnesses:

HENRY CoNNnrr, PETER A. Ross.

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