US20900A

US20900A - Machine

Info

Publication number: US20900A
Authority: US
Publication date: 1858-07-13
Anticipated expiration: 1875-07-13

Description

E. SIRRET, JR., OF BUFFALO, NEW YORK.

SCROLL-SAWIN'G MACHINE.

Specification of Letters Patent No. 20,900, dated July 13, 1858.

To all whom 'it may concern:

Be it known that I, E. SIRRET, Jr., of Buffalo, in the county of Erie and State of New York, have invented a new and useful Improvement in Sawing-Hachines; and I do hereby declare that the following is a full, clear, and exact description of the same, reference being had to the annexed drawings, making a part of this specification, in which Figure l, is a front or face view of my improvement. Fig. 2, is a side sectional view of the same, taken in the line a", Fig. l.

Similar letters of reference indicate corresponding parts in the two figures.

This invention relates to an improvement in that class of sawing machines in which no saw frame or sash is employed and which are generally known as Muley saws.

The invention consists in the peculiar manner of hanging and driving the saw as hereinafter fully shown and described, whereby the same may be readily strained and kept while in operation at a proper degree of tension, and also readily removed from the machine when necessary.

'Io enable those skilled in the art to fully understand and construct my invention I will proceed to describe it.

A, represents a frame which may be constructed in any proper way to support the working parts and B, is a table or bench having a platform C, on its upper end which platform supports the work or stuff to be sawed.

D, is a vertical shaft which is fitted in the frame A, and has two eccentrics E, F, placed on it, one E, at its upper and the other F, at its lower end, see more particularly Fig. l. 'Io each. eccentric a rod Gr, is attached at one end by a strapcc, and the opposite ends of the rods G, are connected by links to bent levers or bell cranks H, I. The lower lever or bell crank H, is attached to an upright J, below the platform C, and the upper lever or bell crank I, is attached to a plate c, which has two saw guides ci, d, attached to it, said guides having a cross head e, fitted between them, which cross head is connected to the lever or bell crank I, by a rod f. The plate 0, is attached to a pendent bar g, in such a way that the plate may be adjusted vertically and retained at the desired point by a thumb screw 71 the latter having a hub or boss i, on it which serves as a support or bearing for plate c,

and the upper end of the screw passing through a nut j, attached to the pendent bar g. It will be seen therefore that the upper bell crank I, has its fulcrum attached to a movable adjustable plate c, and that said crank may be raised and lowered by adjusting the screw 7L'. The lower bell crank H, has a permanent or stationary fulcrum pin, but it is attached to a plate 7c, which is provided with two guides Z, Z, between which a cross head m, is fitted, the cross head m, being connected with the crank H, by means of a rod n.

K, is a saw, the upper end of which is attached to the cross head e, and the lower end to the cross head m, the saw working through a slit in the platform C.

The two eccentrics E, F, are placed in reverse positions on the shaft D, and the cranks H, I, are also attached to their respective bars J, g, in reverse positions and consequently it will be seen that as the -shaft D, is rotated a reciprocating motion will be given the saw K, and as the plate 0, to which the upper crank H, is attached, is adjustable vertically the saw K, by turning the screw L, may be readily strained and kept at the proper degree of tension at all times.

I am `aware that revolving cranks have been directly connected to the upper and lower ends of reciprocating saws, for the purpose of driving the saws without a frame or sash, but, I am not aware that reciprocating bent levers or bell cranks have been employed and arranged as herein shown and described for the purpose of operating the saw and also allowing it to be kept perfectly strained while at work and readily relaxed when it is to be removed from the machine.

I claim therefore as new and desire to secure by Letters Patentl. The bent levers or bell cranks H, I, attached to the cross heads e, m, of the saw K, and operated by the eccentrics E, F, or their equivalents. j

2. Having the upper lever or bell crank I, attached to an adjustable plate c, operated by a screw l1., or its equivalent for the purpose of readily and properly straining the saw and allowing the same to be relaxed and removed with facility from the machine.

E. SIRRET, JR.

itnessesz B. SIRRET, C. A. WALDRON.