US810905A - Power-hammer. - Google Patents

Description

No. 810,905. v PATENTED JAN. so, 1906. A. BRAGG.

POWER HAMMER.

APPLICATION FILED FEB.20. 1904.

2 SHEETS-SHEET 2.

AUSTIN BRAGG, OF WATERVILLE, MAINE.

POWER-HAMMER.

Specification of Letters Patent.

Patented Jan. 30, 1906.

Application filed February 20, 1904. serial No. 194,573.

To all whom it may concern:

Be it known that I, AUSTIN BRAGG, a resident of Waterville, in the county of Kennebec and State of Maine, have invented certain new and useful Improvements in Power-Hammers; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to an improved powerhammer, the object of the invention being to provide improvements of this character which will permit of the finest adjustment of the stroke, said adjustment being accomplished either while the hammer is in operation or stationary.

A further object is to provide an improved elliptic spring-helve with improved mounting and operating mechanism therefor.

A further object is to provide an improved power-hammer of simple construction and operation, capable of the finest adjustment, and always under the complete control of the operator.

With these 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 my improvements. Fig. 2 is a top plan view of the hammer-frame, partly in section. Figs. 3, 4, and 5 are views of details of construction, and Figs. 6 and 7 are'views of a modified form of head construction.

1 represents a bed-frame, the base-plate 2 of which extends forward beyond frame 1 and supports the anvil 3. On this base-frame 1 the hollow hammer-frame 4 is securely bolted and has securely bolted thereto a vertical elongated ram-guide frame or head 5, having guides 6 therein to receive tongues or flanges 7 at opposite sides of ram 8. This ram 8 is made with a central opening to receive the eye 9 at one end of my improved elliptic spring-helve 10, and a pin is passed through alined hearings in the ram and through the eye 9 to pivotally connect them. The eye at the other end of spring-helve 10 is pivotally secured between parallel cars 11 of a tubular bracket 12 by means of a pin 13 passed through said ears 11 and the eye of the helve. Bracket 12 is internally screw-threaded to receive the upper end of a threaded rod 14, the lower end of the latter being screwed into a tubular bracket 15. This bracket carries a split ring 16, mounted on an eccentric 17, and the latter is fixed to a shaft 18, supported in suitable bearings in frame 1. This rod 14 and connections therefore form a swinging rod or link fulcrum for the helve, and said rod can be adjusted vertically by turning the same to properly set the helve.

19 represents a drive-shaft mounted in bearings near the center of frame 1 and carries a driving-pulley 20 at one end and a fly or balance wheel 22* at its other end. All eccentric 22 is secured on drive-shaft 19 between its ends and is engaged by a ring 23, carried by the lower end of an adjustable pitman 24, similar in construction to the fulcrum-rod above described.

Cross-bars 25 are located above and below spring-helve 10 and are connected at their ends by bolts 26, having nuts 27 thereon, which maybe adjusted at will to increase or decrease the tension of the spring and regulate its flexibility. The lower bar 25 is pivotally connected to pitman 24, so that when shaft 19 is turned theeccentric 22 will reciprocate pitman 24 and swing the helve 10 up and down, with the bracket 12 as fulcrum of the helve, compelling the forward end thereof to operate the ram.

To adjust the stroke of the ram to suit varying thicknesses and conditions of work, I adjust the fulcrum-rod up and down, as will now be explained. A Wormgear 28 is secured on shaft 18 and meshes with a worm 29 on a shaft 29, supported in suitable bearings on frame 1 and carrying a sprocketwheel 30 at its end which projects beyond the end of the frame 1. Standards 31 extend from frames 1 and 4 and have alined bearings for a shaft 32, carrying a sprocket-wheel 33, connected by an endless sprocket-chain 34 with sprocket-wheel 30, and a hand-Wheel 35 is secured on this shaft 32 in convenient reach of the operator.

By turning hand-wheel 35 motion will be transmitted, through the medium of shaft 32, sprocket-wheels 3O 33, and chain 34, to shaft 29 and worm 29, and as said worm meshes with gear 28 the latter and shaft 18 will also be turned to move eccentric 17 and raise or lower the fulcrum-rod and bracket 12 at the upper end thereof. This adjustment can be accomplished while the hammer is in operation or at a standstill and is always under the complete control of the operator, who can regulate the stroke of the ram to a hairs breadth by such means.

By employing the spring-helve and eccentric motion the force of the weight of the blow of the ram is multiplied many times, but with a degree of elasticity that, reduces danger of breakage, and at the same time so thoroughly cushions the jar that none is perceptible in the working parts of the hammer when the blow is struck. In this the action is the nearest approach to the smiths arm attainable by mechanical means.

The two ends of the semi-elliptic springs 10 constituting the helve are connected by the.

bar 10, which latter prevents any change in the length of the helve without affecting the cushioning a'ction'of the two sections of the spring-helve.

As shown in Figs. 6 and 7, the head may be pivoted and adjusted to any desired angle, as will now be described. The lower end of the head at opposite sides is provided with trunnions 40, mounted in suitable openings or bearings in the parallel members forming frame 4. A shaft 41 is supported in bearings 4:1 on the head 5 and has fixed thereon pinions 42, meshing with racks 43 on the frame 4:, and a hand-wheel 44 is secured on the end of shaft L1 to facilitate turning the same. It will be seen that by turning hand-wheel 4A pinions 42 will be turned, and the latter meshing with the racks 43 will cause the head to swing to any desired angle. To look the head at any adjustment, a lock-nut 4:5 is screwed onto a threaded portion of shaft 41, and by screwing inward this nut 45 both pinions will be jammed against the bearings 4:1 and frictionally held against movement until released by the nut 15.

A great many slight changes might be made in the general form and arrangement of the parts described without departing from my invention, and hence I do not restrict myself to the precise details set forth, but consider myself at liberty to make such slight changes and alterations as fairly fall within the spirit and scope of my invention.

Having fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. In a powerhammer, the combination with a ram or hammer of an elliptic springhelve having both of its members connected at one end to said ram or hammer and the other ends of said members pivotally supported and justment.

justable support, of an elliptic spring-helve having both of its members connected at one end to said ram or hammer and at the other end pivotally connected to the adjustable support and means connected to the helve intermediate its ends for operating same.

4:. In a power-hammer the combination with a ram or hammer and a swinging fulcrum, the latter being constructed whereby it may be lengthened or shortened, of an elliptic spring-helve having both of its members connected at one end to the ram or hammer and at the other end pivotally connected to the free end of the fulcrum, and means engaging the two members of the helve intermediate the ends thereof for operating same.

5. In a power-hammer, the combination with a ram or hammer, of a movable fulcrum, an elliptic spring-helve connecting said ram and fulcrum, bars on opposite sides of said spring-helve, clamping-bolts connecting said bars and adapted to adjust thetension and flexibility of the spring-helve, and operating means connected with said helve between its ends.

6. In a power-hammer, the combination with a frame, of an elongated ram or hammer guide in said frame, a ram or hammer in said guide having an opening therein, a fulcrumrod, an elliptic spring-helve having eyes in the ends of its two members, one of said eyes pivotally mounted inthe opening'in the ram and the other pivotally mounted on the fulcrumrod, an eccentric, and a pitman connecting said eccentric with the helve between the ends-ofthe latter.

7 In a power hammer, the combination with a frame, of a head. having ram-guides therein and pivoted at, its lower end to said frame, a shaft carried by the head, pinions on said shaft, racks on the frame in meshwith said pinions, a hand-wheel to turn the. shaft, and a lock-nut to secure the. parts at any adthe two ends of the spring-helve and means.

intermediate the ends of the helve for operating same.

9. In a power hammer the combination with a ram or hammer, of an elliptic springhelve connected at one end to said hammer and at its other end to afulcrum, means connectingthe semi-elliptic sectionsof the spring for regulating their tension and means connected to the helve intermediate its. ends for operating same.

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

AUSTIN BRAGG. Witnesses: GEORGE HENRY M-ARR, CHESTER W. GEroHELL.

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