US703737A - Power-hammer. - Google Patents

Description

. Np. 703,737. Patented Jul 1, I902.

J. B. McLANE.

POWER HAMMER.

(Application filed Oct. 18, 1901. Uln Model.) I 2 Sheets8heet I.

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UNITED STATES PATENT GFFICE.

JARED B. McLANE, or NORTH'REA'DlNG, MAssAcnUsn rTs.

POWER-HAMM ER.

SPECIFICATION forming part of Letters Patent No. 703,737, dated July 1, 1902.

Application filed October 18, 1901. Serial No. 79,079- (No model.)

North Reading, in the county of Middlesex and State of Massachusetts, have invented certain new and useful Improvements in Power- Hammers, of which the following is a speci-.

fication. 1

This invention relates to power-hammers; and it consistsin certain improvements therein hereinafter described and claimed, having for their object to condense the spring portion of apparatus employing springs to connect the hammer or striker with its operating mechanism, to provide guides for the hammer which shall be more secure and inexpensive to apply and renew than prior constrnctions, and to provide a treadle mechanism which may be operated from various positions with respect to the machine and with equal facility in any of said positions.

Of theaccompanying drawings, Figure 1 represents a front elevation of a power-hammer provided with my improvements. Fig. 2 represents a side elevation. Fig.3 repre sents an enlarged section on the line 8 3 of Fig. 1. Fig. 4 represents an enlarged vertical section of the spring and connections. Fig. 5 represents a section on the line 5 5 of Fig. 1, showing the treadle mechanism in plan.

The same reference characters indicate the same parts in all the figures.

In the drawings, 1 represents the cast frame of the hammer. 2 is the anvil; 3, the hammer, mounted to slidein vertical guides, and 4 is the driving-shaft, mounted in bearings at the upper end of said frame. A constantlyrunning'belt 5, normally loose on a pulley 6, attached to the shaft, is controlled by a belt-tightener 7 on a lever 8, oscillatedby the treadle mechanism, whereby the beltmay be caused to grip the pulley and rotate the shaft 4.

Fixed to the front end of the shaft 4 is a fly-wheel 9, having a wrist-pin 10, connected by a link 11 with a spring 12, whose lower ends are attached to the outer ends of two ,pairs of links 13 13,which'suspend the ham- 15 15 being outwardly and upwardly rec-urved or looped at 16 16 in their lower portions. The connection with the outer ends of the links 13 13 is formed by pintles 1717, passing through the links and surrounded by bushings 18 18, which occupy the bent or hooked extremities 19 1.) of the spring-arms. -This construction enables me to obtain a long spring and long suspending links, giving greater elasticity tothe blow, out condenses the spring as a whole both longitudinally and horizontally, which, among other things, reduces the danger of the operatives being struck by the spring.

The guides for the hammer are detachable from the frame land are constructed as follows: On the frame 1 is formed a flat seat 20, against which the guide is-held by two vertical rows of bolts 21 21. The guide comprises a gib-holder or base 22, having a planed outer face forming a bearing for the back of a dovetailed guide-engaging'portion 23 of the hammer 3, and two gibs 24 24, mountedin said holder and engaging the edges of said dove- The bolts 21 pass through tailed portion. the gibs and holder and serve to secure the twotogether and to the seat 20 on the frame. Adjustment of the gibs in a horizontal direction is effected by means of adjustingbolts 25-25, mounted in the holder 22, the

'gibs having elongated slots 26, occupied by thebolts 21, to'permit su'ch adjustment. The back of the gib-holder 22 and the face of the seat 20 are left unplaned, and between the two are interposed two leather packingstrips 27 27. Other soft materialsuoh as paper, fiber, lead, &c.may be employed, although leather is preferred. The gibholder finds its own bearing with respect to the seat 20 when the bolts are tightened, for the irregularities of each metal surface sink into the soft packing and a very secure joint is made. The guidemay be removed bodily from the machine, making the expense of replaning or renewal relatively small, and

the construction is obviously such that the parts are few in number and may be easily assembled, taken apart, or adjusted. The interposition of the leather packing avoids the expense of planed seating-surfaces for the removable guide, and the cushioning action of this packing increases the life of the guide and prevents the bolts 21 from becoming loosened by the jarring of the machine.

A further improvement lies in the treadle construction, which I shall now describe. 28 28 represent; two rocking treadle-frames having side arms 29 29 and cross portions 30 30 at the outer ends of the side arms. The frames have four hinge-bearings 31 31 at the inner ends of their side arms, and the side arms of one frame are crossed with those of the other frame and pivotally connected thereto at the crossing by bolts 32 32, attached to one set of arms and occupying elongated slots 33 in the other set. One of the side arms is connected by a rod 34 with the lever 8, which carries the belt-tightener 7. The belt-tightener may be actuated by stepping on any part of the treadle structure above the bolts 32 32, which willresultin depressing the rod 34 without any noticeable springing of either of the treadle-frames, such as is observable in single treadle-frames of the shape shown when the side away from the operatingconnection,such as 34,is stepped on.

I claim- 1. In a power-hammer, the combination of a hammer, a hammer-operating member, and a connection between the twoincludingapair of links suspending the hammer at their outer ends, and a lyre-shaped spring device connected with the hammer-operating member and having two depending spring-arms formed with outwardly and upwardly re- .curved terminal portions connected to the outer ends of the links.

2. In a power-hammer, the combination of a frame having a seat for a guide, hammeroperating means mounted on said frame, a hammer, a guide therefor, having an unplaned back, bolts detachably securing the guide to said seat on the frame, and a soft packing interposed between the guide and said seat.

3. In a power-hammer, the combination of a frame having a seat for a guide, hammeroperating means mounted on said frame, a hammer having a dovetailed guide-engaging portion, a guide for said hammer comprising a gib-holder engaging the back of said dovetailed portion of the hammer, gibs mounted in said holder and engaging the edges of said dovetailed portion, and bolts passing through said gibs and gib-holder and detachably securing the same together and to said seat on the frame.

In testimony whereof I have afiixed my signature in presence of two witnesses.

JARED B. MCLANE.

Witnesses:

C. F. BROWN, A. D. HARRIsON.

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