USRE3454E - Improvement in hanging reciprocating saws - Google Patents

Description

THOMAS BAKEWELL AND JOHN LIPPINOOTT, OF; PIT'rsBU'Re, PnNNsYLvANiA', As-

SIGNEES, BY MESNE ASSIGNMENTS, OFPEARSGN CROSBY.

Lette/rs Patent No. 25,632, dated October 4, 1859;; reissue No. 3,454, lated May 25, 1869.

IMPROVEMET IN HANGING- RECIPROCATIG vSAVV'S.

Y The Schedule referred to in these Letters APatent and making parto! the lame.

To all whom it may concern Be it known that PEARsoN CROSBY, of the city, county, and State of New York, has invented a new and useful Improvement in Hanging Reciprocating and we do hereby dec-lare that the following is a full, clear, and exact description thereof, reference being had to the accompanying drawing, forming pari of this specification, in which- Figure 1 isa side view of a reciprocating saw, showing PEARSON CROSBYS improved mode of hanging.

Figure 2 is a front view ofthe same.

Figure 3 is an enlarged front sectional view of the buckle and end of the saw, through the line z-cc, ii g. 1.

The same letters referto similar' parts in the several figures. The Object of this invention is to Obviate the didiculties experienced in hanging reciprocating saws, especially when hung in gangs, so as to have them evenly strained, that is, subjected to an equal tension throughout the whole width of the saw, or nearly so, and at the same time admit of the saw being adjusted forward, from time to time, as it is worn or reduced in width by sharpening or gumming.

To enable others skilled in the art to use thisinvention, we will proceedto describe it by reference 'to the drawings. k Alrepreseuts a long saw of the usual reciprocating At each end ofthe saw, and on both sides, are metal# lio strips a of, extending across the saw its Whole width or nearly so; the lower edges of the upper strips a, and the upper edges of the lower strips a', being bevelled or inclined, so as to. form a dovetal, as shown Iig. 3, by which the buckles used to hang the saw, having correspondinglyv bevelled lips c c, may the more easily engage-and securely hang the saw.

Saws are frequently made very thin, and if the stlrrnp, or other device by which the saw is hung, bears against 'these strips a a at one or two points only, the strain of the saw is' uneven, and it will buckle at those parts where the strain is slightest, and the ends of the saw will be apt to pull off. y I

Another difficulty arises in giving the proper rake or forward set to one end Of thesaw, where the stirrup is rigidly attached, either to the` saw itself', or to the buckle or device intermediate between the saw and the stirrup, that the strain is uneven, and the strips are apt to pull of? the end of the saw.

It also sometimes happens that the strips a a are not of exactly equal depth, or are not placed with their bevelled edges on Vexactly the same plane, in which case the lips of the buckle would not bear equally On both sides ofthe saw.

The bucklesB B', used for holding the two ends of the saw, and attaching thereto the stirrups of the sawgate, are composed of two side pieces, or plates bb,

made of wroughtiron, malleable cast-iron, or-other suitable material.

' These side pieces b b are better made oi two separate plates, although they might be made of one piece, and bent over.

The two side pieces fb b .are counterparts of each other, having at one end straight lips c c, which projeetso as to leave a space between them equal only to the thickness ofthe saw to be held between them.

The lips c c are dovetailed or bevelled, (see fig. 3,) so as to correspond exactly with the bevelled edges of'v the strips a c', attached tothe saw A.

lThese plates must be held together so firmly as to hold the saw, and yet not. bind it too closely. This is eifected, as also a .slight vertical adjustment of one side piece relatively to the other, by means ofthe rivets d, the ends of which are itted into holes e, in the plates b b, which holes are countersunk on the inner side, and slightly also-on the outer side of the plates, so as to allow a head to be formed on thev rivets by upsetting,ras shown in fig. 3.

Around each rivet d is placed a case, or tube j, which serves as bearings, to prevent the lips c c, of the plates b b, from binding too hard on the sides of the saw.

Rivets, with shoulders below the ends which are to be upset, are an equivalent device for the rivets and tubes, for the purpose just'named.

Near the upper edge of the upper buckleB is a pin, g, which may have its ends couutersunk in corresponding holes iu the side pieces b I1, precisely like the holes e for the rivets d. The pin g fits looselyv in its bearings, so that the buckle B may turn thereon. in order to give proper rake77 to the saw.

The iron stirrup h is pivoted to the buckle by the pin y, and, passig up through the top traverse bar fi of the sash, is secured therein by the wedge-key j', bv driving which key the saw is strained.

vThe lower buckle B is similarly constructed, and has a pin, k, near its lower edge, iitted in countersunk holes,'like the piu g of the upper buckle B.l

By the pin k, the lower links, or bars Z, or other'` device by which' the lower end of the saw is secured to the lower traverse bar a of the sash, are pivoted to the lower buckle B'.

It will be seen that the sides of thebuckles thus constructed are plane surfaces, and that the buckles may be made so thin as to permit of their being placed closely together, and thus this invention may be used to hang saws in gangs.

When the wedge-shaped key j is driven into the stirrup h, the saw A will be strained tight between the upper and lower traverse.

In consequence of the buckles B B extending across a great portion of the width of the saw, the saw will be moreequally strained, from front to back, than Aso as to compensate for any variance in' the depth of when the bearing is only at one or two points, and all buckling ofthe saw is thereby prevented; and as the saw becomes worn by being gumrned or sharpened, it may be moved forward in the buckles B B', which do not bind suiciently to prevent such adjustment.

Any required rake or inclinationv maybe given to the saw, in consequence of the pivoting of the stirrups h and l. to the buckles B B', while the stiles that support the gate are retained in a perpendicular plo-- sition, and this even when thesaws are hung in gangs. By having the pins g and k and ,the rivets d fitted loosely into holes countersunk on the inner sidesof the plates b b, as before described, said platesare al lowed, under the strain to which they are. subjected in driving home the key j, to adjust themselves vertically,

attached at or near the end of the saw, in combination with a lpin or pivot, by which the buckle is attached to the stirrup, the buckle being left free to adapt itsel` to the rake or inclination givento the saw, substantially as described, and f or the purposes set fortb.

2. Pivoting the stirrup of reciprocating saws by a single pin orrpivot to a buckle bearing against straps fastened across the ends of the saw, substantially as described.

3. A buckle for hanging reciprocating saws, consisting of side pieces, each with a continuous lip or lips, for vengaging the straps on the' ends of the saw, and pivoted by apin, q or k, at asingle point only, to the stirrup by which it is connected with the saw-gate, substantially as shown and described. j

In testimony whereof, we, the said THOMAS BAKE- WELL and J ons LiPPINeo'rT, have hereunto set our hands.

the strips a a a', so that such lip c shall have a perfect bearing on its strip a, or a.

Having thus described PEARsoN CnosBYs improvement in hanging reciprocating saws,

What we claim as his invention, and desire to se- Trios. BAKEWELL.-

JOHN LIPPINc'oTT.

cure by Letters Patent, is-' Witnesses:

1. Hanging reciprocating saws by means of buckles G. H. CHRISTY, B, having a continuous bearing on va strap or straps R, F. JONES.

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