US482103A

US482103A - Portable band sawing-machin e

Info

Publication number: US482103A
Authority: US
Publication date: 1892-09-06
Anticipated expiration: 1909-09-06

Description

(No Model.)

A. O. SPEER. PORTABLE BAND SAWING MACHINE.

No. 482,103. Paten'ted Sept. 6, 1892.

Units STATES PATENT FFICE.

ABRAM C. SPEER, OF WOODVILLE, OREGON.

PORTABLE BAND SAWING-MACHINE.

SPECIFICATION forming part of Letters Patent No. 482,103, dated September 6, 1892. Application filed September 25, 1891. $erial No. 406,817. (No model.)

To all whom it may concern:

Be it known that I, ABRAM C. SPEER, of VVoodville, Jackson county, State of Oregon, have invented certain new and useful Improvements in Portable Band SawingMaphines, of which the following is a specifica- One object of my invention is to produce a sawing-machine which shall be easily portable and which shall be equally adapted to felling trees or to cutting up logs and timber when lying in a horizontal position.

Another object of myinvention is to adapt a band-saw to be used with a portable machine actuated either by manual or animal power or by a motor of any description.

In the accompanying drawings, Figure 1 is a side elevation of myimproved apparatus in position for operation. Fig. 2 is a plan view. Fig. 3 is a vertical section; and Fig. 4 shows a detail of the connection between the fixed and the swinging 1 frames which conjointly support the saw.

The devices for supporting the saw consist, essentially, of two frames, one adapted to be fixed in relation to the work and the other carrying the saw and pivoted so as to swing upon the first, and thus feed the saw forward as the cutting progresses.

The fixed framework consists of side bars A A, a cross-bar B extending from one side bar to the other. The shafts O and D also serve to connect the side bars AA and maintain them in their proper position. The lower ends of the side bars A A are pointed, so as to be readily driven into the ground, and from pivots at their tops extend braces E E, the farther ends of said braces being pointed or otherwise adapted to be secured to the log or other piece operated upon.

The swinging frame consists of side pieces F F, pivoted upon the shaft D or concentric therewith and connected at their outer ends by an arch G, extending laterally relative to the frame. Their inner ends are connected by a brace or braces H H, Fig. 3, and upon these braces is mounted a suitable bearing for the driver-pulley I, the plane of whose rotation is parallel with the shaft D. The shaft D receives motion from any suitable source, that shown in the drawings being a gear-wheel J, mounted upon the shaft 0 and receiving motion from the cranks K K,such motion being communicated to the shaftD through the pinion L on the shaft. The connection between the driver-pulley I and the shaft D is through a pair of beveled gears M N. At the outer end of the side pieces F, near the foot of the arch G, joining them, are placed carrierpulleys O O, and a band-saw P passes over the driver-pulleyl and the pulleys O 0. One or both of the latter are made adjustable, so as to regulate the tension of the saw P. The adjustment consists of a sliding bearing Q, bolted to the side piece F, which can be adj usted by means of a screw R, tapped into the end of the side piece F, connected by collars to the bearing Q, so as to move with it.

The cutting is done by that portion of the saw which lies in the open space under the foot of the arch G between the carrier-pulleys O O. In order to make uniform the feedingpressure upon the saw P, I connect a spring S (see Fig. 4:) to the fixed and the swinging frames, respectively, so that as the swinging frame approaches a horizontal position the tension of the spring S is increased, and the increased effect of gravity is thus with more or less accuracy compensated for.

In the drawings I have shown the fixed portion of the frame as vertical, the saw operating upon a horizontal timber. "When operating upon a standing tree, the fixed frame should be somewhat inclined, so that the swinging frame may stand Vertical, or nearly so, at the beginning of the operation.

By the construction described, having the cutting portion of the saw at the outer extremity of the swinging frame and supporting the frame by means of a laterally-extending arch, great capacityand range is given to the saw, as the whole space Within the swinging frame is open, so that large pieces may be operated upon and a deep cut may be taken. The swinging frame can be made of any length desirable, its capacity for resisting the strain of the saw not being materially effected by increasing its length.

Without confining myself to the precise devices shown and described, what I claim as new and as my invention is- 1. The combination, with a band-saw, of a swinging frame having an arched outer end, a carrier-pulley near each foot of the arch, a

driving-pulley at the pivoted end of the frame, having its plane parallel with the pivotal axis of said frame, and a shaft and gearing concentric With said pivotal axis and connected to gearing on said driver-pulley, substantially as described.

2. The combination of a fixed frame, a driver-shaft journaled therein, a swinging frame pivoted concentrically with said driver-shaft, a driver-pulley parallel to said shaft, and carrier-pulleys at the outer ends of the side pieces of said swinging frame, the saw passing over said pulleys and having its cutting portion lying between said carrierpulleys, substantially as described.

3. The combination, in a band sawing-machine, of supporting devices consisting of a frame adapted to be fixed in relation to the piece operated upon, a swinging frame pivoted to said fixed portion, the outerend of said swinging portion being spanned by a laterally-projectin g arch, pulleys carried by said swinging frame and having their planes of rotation parallel to the pivotal axis of said swinging frame, and a band-saw extending 25 across the open space at the outer end of said swinging frame, substantially as described.

4. The combination, in a portable band sawing-machine, of a frame having pointed side bars adapted to be driven in the ground, 30 braces pivoted to its upper portion and adapted to be secured to the piece operated on, a swinging frame pivoted to the first-named frame, the outer end of said swinging frame being spanned by a laterally-projecting arch, 35 pulleys carried by said swinging frame and having their planes of rotation parallel to the pivotal axis of said swinging frame, and a baud-saw extending across the open space at the outer end of said swinging frame, sub- 30 stantially as described.

ABRAM C. SPEER.