USRE425E - Improvement in method of driving reciprocating saws - Google Patents

Description

municated to the piston or cylinder, and cut,

' should have just play enough between the top UNITED STATES Refi' .TJLLAL'LLL CORI e A PATENT OFFICE.

ISAAC BROWN, Oli BALTIMORE, MALYIIAND.

IMPROVEMENT IN METHOD OF DRIVING RECIPROCATING- SAWS.

Specification forming part of' Letters Patent No. 9,855, dated July lll, 19.53; Reissue No. 425, dated February 3,'1`B57.

To all whom 'it may concern Be it known that I, ISAAC BnowN, of Bal.- timore, in the county of Baltimore and State i of Maryland, have invented certain new and useful Improvements in the Method of applyingthe Power ot' Steam to Saw-Illill Gates or l Frames; and I do hereby declare the following to be a full, clear, and exact description of the same, reference being had to the accompanying drawing, making a" part of the specilication.

The nature of my invention consists in so applying the power oi' steam to the saw gate or frame of a saw-mill as that, if the said gate or frame should vibrate laterally or otherwise run out ot' line, said defect shall not be comcramp, or otherwise injure them.

Po enable others skilled in the art to make and use my invention, I will proceed to describethe same with reference to the drawing.

The fender-posts A may be substantially formed of wood, iron, or parts of cach, and I firmly attach thereto the steam-cylinders B C, of any of the ordinary constructions, and through said cylinders, in proper stallingboxes, I pass a piston-rod, G, furnished with a single piston-head, and extending suilficiently far beyond each end of the cylinder so that one end of each of said rods may bc almost in contact with the u nder side of the projecting top piece D of the sawframe, and the other end of said rods may be also nearly in contact with brackets E, formed on the outside of' each oi the pieces F oi' said frame. The rods C of the gate and the brackets to allow for expansion of the metal and' prevent cramping or binding; and they may, instead of Working against the brackets, extend down to the bottom-piece G of the frame and work against projections thereon similar to those in the toppiece D 5 but this will only require longer and heavier piston-rods Without achieving an y' desirable object unless unusual length of vibration or stroke is required. The rods should` work close enough between the projections` and the brackets to prevent slamming or wearing, and it may be found advisable to insert a piece of prepared rubber or other spring between the rods and the projections. The ob- `ject in leaving `the rods unconnected from the gate or frame'is for the purpose of preventii'lg the play of the gate from being communicated to the pistons and causing thelnto cut or bind in the packing or cylinder, which would be the ease if attached, for then the top oi' the gate would serve as a crosshead, and all the lateral vibrations or strainings of the gate would t be communicated directly to the piston-rods.

thereof, and connnected thereto by wristpins a. a, are the pitmen or connecting rods H 1l.

Ytheir lower ends being also similarly connect ed by wrist-pins b b to the iiywheels I I on the shaft J, and said liy-wlleelsmay be counterbalaneed to facilitate the vibrations ofthe gate.

The carriage or feed-rollers for feeding up the material to be sawed may be of the usual well-known forms of construction, and may be operated by thc engine in a manner well known to mechanicians.

I have represented in the drawing two cylinders and a gang of saws. A single cylinder and one or more saws may be used, in which case the cylinder and' pistonrod may work within the vertical iside. pieces of the gate, or near enough to its center to proper/ly balance it, and the saws may be hung to the projecting ends of the top and bottom pieces of the gate. I have also represented the pistons as moving and the cylinders as being stationary; but the cylinder may be made to move and carry the gate, while the rods maybe fixed or immovable, and, although not so mechanical, would produce the same result.

Having thus fully described the `nature of my inyention, what I claim therein as new, and desire to secure by Letters Patent, is

l. The mode herein described of applying the power of the engine to the saw gate or frame without being permanently connected therewith, so that the piston shall in a great measure be relieved from any lateral motion which the gate may have which causes it to bind or cut in the cylinder, substantially as described.

2. Driving' one or, more saws between two cylinders, as well as driving one or more saws on each side of a sin glo cylinder, and the seliadjustable pistoni-od or the self-adjustable slides, which accomplish the same result as are herein before described.

ISAAC BROWN.

VVitncsses y I?. W. EcItLorF, JonN S IIoLLiNGsnEAD.

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