US177621A

US177621A - Improvement in scroll-saws

Info

Publication number: US177621A
Authority: US
Publication date: 1876-05-23
Anticipated expiration: 1893-05-23

Description

H. J. GORDESMA1\T,.Trl

'sc-ROLL-SAWS. v No. 177,621.-v Patented May 23,1876.

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--of the machine.

UNITED STATES PATE 'r HENRY J. oonDEsMAN, JE., oF oINoINNATI, oHIo, AssIeNon To ooRDEsMAN,

- EGAN a oo., oF sAME PLAGE.

e IMPROVEMENT |N scRoLL-sAws.

Specification forming part of Letters Patent No. 177,62 l, dated May 23, 1876; application ledA February 19, 1876.

To all whom it may concern Be it known that I, HENRY J. CoRDEsMAN, Jr., of Cincinnati, Hamilton county, and State of Ohio, have invented an Improvement in Reciprocating Scroll-Saws, of which the following is a specification: y

My invention consists, rst, in a peculiar construction'of the saw cross-head, by which provision is made for the easy removal and correct and ready readjustment of the saw; second, in a solid cross-head for the saw, hav ing flaring notch with depressionsfor the reception of the saw; third, in a new and peculiar device for shifting the belt, and at thel same time arresting the momentum of the saw and parts connected thereto.

I n the accompanying drawings, Figure l is a perspective view of the moving parts of my saw, showing also a portion of the frame of the machine. Fig. 2 is a perspective view of the saw-slide, to which the upper end of the pitmanand lower end of the saw are secured. Fig. 3 is a section of the saw-slide through the pitman-trunnions.

A is a portion ofthe frame of the machine, havinga bearing, a, for driving-shaft B, and bearing a for belt-shifting rod (.l. D is the crank or brake wheel, (secured to shaft B,) to which is attached the pitman E. On shaft B are the loose and tight pulleys b b', respectively, and-on rod C are a couple of fingers, c

, c', for shifting the belt from one pulley to the other. Secured to the upper end of pitman E, which is split at e to receive it, is a retaining-hook or cross-head, F, and guide-plates G G,lformed to encompass the usual slideways These plates are firmly secured to the cross-head F by means of small screws shown in Fig. 3.' lThe cross-head F is formed of solid steel,and, as seen in Fig. 3, has formed upon it two trunnions, f ji, to enter the arms ofthe pitman E, and thereby form a swiveling connection. The arms of the pitman are held upon these trunnions by means of screws el c2 and plates c3 c4. The

arms of the pitnian are formed to receive thel trunnionsff, and take up lost motion in the swivelingjoint by means of slits c5 and bolts e, as seen in Fig. 2. The upper part of crosshead F is enlarged in width, and extends depressions are above the top'of pitman E, having a slot, H, which flares laterally in wedge-shape. 0n the projecting side of cross-head the plate G is secured. rlhe plate G at the top is bent over, and extends laterally outward to form a step, gb, over the top of pitman E. On the inner surfaces ofthe slot H are horizontal depressions L hl, and at right angles to these perforations '102, 'whose limits extend above the topedges of the depressions lt h1. The lower end of the saw-blade I has cylindrical projections t', from its sides, in such position that when the end of the saw rests upon the step g of plate G they will be directly in line with depressions h h1 in slot H, and can easily be slid into theslot by reason of the iiaring edges above mentioned; and by reason of the upward extension ofthe perforations h2 beyond the depressions IL h1 the crosshead F will retain the sawfblade in operation,

When under strain.

It is evident by the construction vof abovementioned device, consisting of cross-head F, having flaring slot H, depressions It 71,1, and perforations h2, and the plate G and step g, that great facility is provided for replacing the saw after it has been removed to enter inside Work, as the step g limits its downward motion, and guides it into place. On the lug a, extending from frame A, is secured a footlever, J, having cam-projectionj. K is a brakeblock, iitted to embrace accurately the lower edge of the wheel which it rests. The brake K and lever J are both secured to the lug a by means of a bolt, j', passing through theml Secured to frame A' is a'lug,o,3,upon which is secured and opcrates a bell-crank lever, L, whose long arm 'l connects with a rod, M, attached to the shifting-rod C, which slides in bearing a', and whose short arm Z connects with rod N attached to lever J at a point close to the camprojection j. Y

By reason of the Acombined action of parts just 'described the brake-block K will arrest the motion of wheel D at the same time that the shifting-rod C shifts the belt from tight pull-ey b to loose. pulley b, and an instantaneous stoppage ofthe saw will be the result.

NEIGE. e

D, and it has a cam provjcction, 7c, .to correspond with cam. j, upon `depressions h h1 h2, substantially as and for the purpose specified.

2. The solid cross-head F, provided with flaring jaw H, having depressions h h1 h2, arranged substantially as and for the purpose specified.

3. In combination with the brake-Wheel D and fast and loose pulleys b b the cam-brake K, cam foot-lever J, and shifting-rod C, connected and operating substantially as land for the purpose specified. Y

In testimony of which invention I hereunto set my hand.

HENRY J. CORDESMAN, JR.

Witnesses:

' EDGAR J. Gnoss, JoHN E, JONES.