US2497639A

US2497639A - Two-position mobile power saw

Info

Publication number: US2497639A
Application number: US777189A
Authority: US
Inventors: Underwood Leo
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-10-01
Filing date: 1947-10-01
Publication date: 1950-02-14
Anticipated expiration: 1967-02-14

Description

L. UNDERwooD Twol os1fr1oN MOBILE POWER sAw 2 sheets-sheet 1 IN VEN TOR.

[.90 Underwood BY W /f/or/ze/ mw. :SW

Feb. 14, 1950 Filed oct. 1, 1947 m m mm W, nv e N0 w m mw W 4 v mw a 2, t d l w n m ai 2 c m A0 m n m wm UJFIIJ mm ww mm A m w MTN. un I m. INN T Feb. 14, 1950 Flled Oct l 1947 Patented Feb. 14, 1950 UNITED STATES PATENT OFFICE TWO-POSITION MOBILE POWER SAW Leo Underwood, Bigelow', Ark.

Application OctoberL 194.7,I Serial No. 777,189

(ci. 14a-43 3; Glairns.y 1.

This invention relates to power-driven portable circular saws.

An object of this invention is to provide a simplified light-weight all purpose portable saw which isoi rugged construction and adaptable for use'in cutting underbrush, trees, stumps, clearing otright-oi-wayas well as being capable oi trimmingl limbs from fallen trees, and cutting logs into desired lengths for pulp wood or ties or the like. Also in general construction work such as bridges where the saw is useful in trimming theY edges-of-bridgeiloors and cutting desired lengths of heavy` timber.

Another objectoi"thisinvention is to provide an improved portable power driven circular saw designed to be maneuvered on rough ground and inatheunderbrush where logging operations arel inprogress, so that the saw may be easily positioned with respect to the logs to cut same at desired points without the necessity of movingv thelogs toy level the same.

Another object ofy this invention is to provide a. combination oi' features resulting in a twoposition mobile saw which is readily portable, can be quickly set up in, position, minimizes labor in operation and in which the saw can operate ineither vertical or horizontal position.

With the above and other objects in View, the inventionv will beI hereinafter more particularly described, and the combination and arrangement ofparts will be shown in the accompanying drawings and pointed out in the claims whichform part of this specification.

Reference will now. be had to the drawings, wherein like numerals of reference designate corresponding parts throughout the several views, in which: g

Figure 1 is atop plan view of the portable saw.

Figure 2 is a side elevation of the portable saw shown in Figure l, one rear wheel being partly broken away.y

Figure 3 is an enlarged cross-sectional viewl of a vertically adjustable pivotal lockable housing for a saw carrying frame, the section being taken as, on line 3--3 oiligure l.

Figure 4 is an enlarged cross-sectional View of the lockable housing, the section being taken as` online 4.-4 of Figure 3.

Figure 5, Sheet l, is a bottom plan view of a motor mounting, partly broken away to show threadable adjustment means for the motor- Figure 6 is an enlarged cross-sectional view of, an'adjustable clamp for the saw carrying -rame thesection beingv taken as` on line 6--6 of Fig'- ural... i

Figuref'sisian enlarged cross-sectional view of amounting for the saw shaft, the section beingtakenas on line l--liof Figure-2.

FigureI 8is an `enlarged fragmentary perspective view of a channel section'which carries the .i adjustable clamp for the saw carrying frame, the.-

channel being` shown as secured to a transverse member of the vehicle frame.

lggrure 9'tis a perspective view -of the bottom ofamotor plate.

Figure l0 is a cross-sectional View of the motor mounting showny in Figure 5, the-section beingV taken on line {El-IIJ:y off'Figure 5.

Figure ll is a cross-.sectionalviewof a twoposition housing, the section being taken as on line H-H ofFigure 1.

ln the illustrated embodiment ot the invention,- the numeral l!) indicates.v a two-wheeled vehicley comprising a substantially rectangular vehicle Theirame Il` includes parallel sidemembers t2 having converging diagonal braces |31 by. As shown in Figure 2, the axle i9is secured l to the frame l i-by U-shaped clamps 20'.

suitably secured to the transverse member:y I4

is'an, elevating device 2l comprising an uprightI guide-member 2 2 having anupright guideway23. and h aying bearing Etrwhose axis is vertical atv its Vvupper end.

A.threadedcrankihandle 25.' is rotat ably-mount-v ed in the bearing 2li and is held against upward ordownward motion `by' collars 25 and transverse pinsl. As shown in Figure 4,. it will be-noted thatzthe crank` '25, and hence also the bearing 24 f (thelatter does not appear in Fig. 4) are offsetv vfromthe guide member 22.

Aclamp arm i9` having a threaded aperture 30 is :pivotally mounted on the threaded crank handle 25- and# may. be swungl horizontally toward the'y Bolts 32 pass through the guide member 22. clamp harm 29 and through the guide member 2-2` and have threaded nuts 33 threaded thereon. A

plate 34 is mounted on the bolts 32 adjoining the inner face oi the guide `member 22.

The

assembledpartsf

2S, 32 and 34 form averticallyslidable lockable housing 35 designed tov receivethebody portion 36 ofa Tehanedsaw.-

Suitably connected to the2 3 frame 31. The body portion 35 is of circular cross-section and contacts the plate 34 and a plate portion 38 at the free end of the clamp arm 29.

As best shown in Figs. 3 and 4, the bolts 32 support a threaded member 40 in which a crank handle 4l having a bolt extension 42 is threaded. The extension 42 provides means for forcing the clamp arm 29 in direction of the clamp plate 34 to adjustably lock the saw frame 31 in selective angular cutting positions of the saw.

As shown in Figure 8, a channel-shaped member 45 is pivotally mounted on a rpivot 46 passing through the flanges bi1 of the channel and seating in bearings 48 fixed to the transverse member I of the vehicle frame Il.

As shown in Figure 5, the channel 45 has slots 49 for an engine mount or platform 5U on which an engine 5l is suitably mounted and secured by bolts 52 (Fig. 10) on the rear [part of the machine.

The rear end of the saw frame 31 is supported in a split 'collar or clamp 53 which is suitably iixed to the channel member 45. The collar 53 has iianges 54, (Fig. 6) one of which is threaded .for engagement with a threaded portion of a crank handle 55.

It is to be noted that the body portion 36 of the saw rframe 31 Ihas a curve 39 which forms an offset front extension 35. This curve serves to align the engine and saw pulleys while operating in either vertical or horizontal positions.

At the termination of the extension 36 is a tubular housing 51 for a shaft 58, (Fig. 7) to one end of which a pulley 5S is secured. At the other end a large diameter circular saw 65 is secured.

It is to fbe noted that the housing 51 is suitably ifastened to the extension. 35 away from the middie of the housing so as to rform a short leg 6l and a long leg 5E. The short leg 5I is of such reduced length to cause the saw lpulley 59 to bein alignment with a drive pulley 63 on the engine shaft 64.

Connecting the pulleys 5S and 63 is a V-shaped belt 65 which, in the position shown in Figures l and 2, shows a partial twist. The degree of this twist is of course dependent upon the position of the plane of the saw 50 relative to the vertical. This arrangement provides a direct belt drive whereby the saw pulley 59 changes its height of operation while retaining alignment with the drive pulley.

As shown in Figure 11, the free end of the body 36 of the saw lframe 31 has two arcuately spaced V.shaped or countersunk apertures 55, spaced 9G ,degrees apart, and that a pin 61 having a V-shaped end is pressed by a compression spring S8 to enter a selected one of these apertures according to whether the saw is in vertical or horizontal position.

The apertures 65 and the coacting pin 51 provide releasable locking means lwhereby the member 36 is locked in either the position shown in Fig. l1, which corresponds to the position thereof in Figs, l and 2 with the saw 55 horizontal, or, upon rotation of the member 36 through an arc of l90 degrees (clockwise, Fig. 11) in the position after said rotation, in which latter position the saw Si) would obviously lie in a vertical plane, not shown. A collar 69 is threaded on a tubular boss 1U on a housing 1i xed to the channel 45. The collar 53 maintains the pin 51 and spring 68 in position. An operating handle 12 (Fig. 1) is. suitably secured to the body portion 36 of the saw frame 31 and serves for rotating the saw frame when thecrank handles 4| and 55. are

4 actuated to loosen the clamp or lockable housing and the adjustable clamp 53 shown in Figure 6.

In practice, the saw BIJ may be operated at ground level or elevated to a height of about eighteen inches through the use of the vertically adjustable housing shown in Figure 3 when in horizontal position.

While in vertical position, the saw may be elevated sufiiciently high to trim limbs of trees. At all times the saw may be changed from vertical to horizontal position without stopping the engine and without the belt losing its normal tension. The saw revolves toward the operator, thus throwing the sawdust in the opposite direction.

When the saw is operated as above described in horizontal position, when the housing 35 is raised, the saw is slanting. It is however possible by the addition of an attachment (not shown) to the pivot shown in Figure 8, to cause the rear end to rbe raised to provide level horizontal operation at above-ground level.

As shown in Figures 1 and 2, the rear end of the channel has a transverse wall 13 having a clearance aperture in -which a rod extension 14 of a crank handle 15 is freely rotatably mounted. The crank handle is held against movement from the wall 13 by a collar 16. The free end of the rod 14 is threaded and engageable with a threaded lug 11 (Fig. 9) at one end of the enginemount 50.

The above threaded arrangement provides means permitting adjustment whereby the engine mount or platform may be moved back- Iward or forward along the channel 45 to adjust the belt for proper tension or for the purpose of relieving the torque when starting the engine.

As shown in Figure 9, the engine platform 50 has parallel lugs 18 spaced-apart for engagement with the flanges of the channel 45 when making belt adjustments. The platform 50 has elongated tlucugh slots 19 through which engine bolts pass for securing the engine 5I to the platform 50.

It will thus be seen that there has been provided a portable circular saw which can be manipulated like a wheellbarrow on ground contacting 'wheels and approached at any angle to a fallen V74angularity of the fallen log with respect to the ground.

`ment of my invention, but it will be understood that various changes and modifications can be made therein without departing from the spirit of the invention as dened by the appended claims.

I claim:

1. rIn a portable circular saw comprising a vehicle having two wheels and an axle supported thereby, a Vehicle frame supported on said axle intermediate said wheels, said frame converging .at the forward end of said vehicle and terminating in a guide member having an upright guideway, said guide member comprising a vertically rotatable threaded rod parallel with said guideway and rearward thereof, a pivotal clamp arm threaded on said rod and movable in a horizontal plane to and from said guide member, bolts passing through said clamp arm and through said guideway and carrying a clamp plate parallel with said clamp arm, an elongated saw carrying frame having a circular body portion passing through and being rotatable in said housing, means for forcing said clamp arm in the direction of said clamp plate to lock said saw frame in various selective angular cutting positions of said saw, an engine on said vehicle body having a driving pulley, a driven pulley for said saw, and a belt connecting said pulleys and movable with said driven pulley in all positions of said saw between horizontal and vertical positions.

2. In a portable circular saw comprising a vehicle having two wheels and an axle supported thereby, a vehicle frame supported on said axle intermediate said wheels, said frame converging at the forward end of said vehicle and terminating in a guide member having an upright guideway, said guide member comprising a vertically rotatable threaded rod parallel with said guideway and rearward thereof, a pivotal clamp arm threaded on said rod and movable in a horizontal plane to and from said guide member, bolts passing through said clamp arm and through said guideway and carrying a clamp plate parallel with said clamp arm, a T-shaped saw frame having short and long legs, said frame having a shaft rotatably mounted in the leg portions thereof, a circular saw mounted on said shaft at the end of said long leg, said saw frame having a body portion receivable in said housing, said body portion being of circular cross-section to permit pivotal adjustment of said saw frame and said saw about said body portion between horizontal and vertical positions while supported by said housing, means for forcing said clamp arm in the direction of said clamp plate to lock said saw frame in various selective angular cutting positions of said saw, an engine on said vehicle body having a. driving pulley, a driven pulley carried by said shaft at the end of said short leg, and a belt connecting said pulleys and movable with said driven pulley in all positions of said saw between horizontal and vertical positions.

3. In a portable circular saw comprising a vehicle having two wheels and an axle supported thereby, a vehicle frame supported on said axle intermediate said Wheels, said frame converging at the forward end of said vehicle and terminating in a guide member having an upright guide- Way, said guide member comprising a vertically 6 rotatable threaded rod parallel with said guide- Way and rearward thereof, a pivotal clamp arm threaded on said rod and movable in a horizontal plane to and from said guide member, bolts passing through said clamp arm and through said guideway and carrying a clamp plate parallel with said clamp arm, a T-shaped saw frame having short and long legs, said frame having a shaft rotatably mounted in the leg portions thereof, a circular saw mounted on said shaft at the end of said long leg, said saw frame having a curved or bent body portion and having an end portion receivable in said housing, said body portion being of circular cross-section to permit pivotal adjustment or said saw frame and said saw about said body portion between horizontal and vertical positions while supported by said housing, means for forcing said clamp arm in the direction of said clamp plate to lock said saw frame in various selective angular cutting positions of said saw, an engine on said vehicle body having a driving pulley, a, driven pulley carried by said shaft at the end of said short leg, a belt connecting said pulleys and movable with said driven pulley in all positions of said saw between horizontal and vertical positions, and means for tilting said T- shaped frame upwardly in angular relation relative to said vehicle body, with the vertex of the angle positioned rearwardly of said lockable housing.

LEO UNDERWOOD.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,014,593 Guthrie Jan. 9, 1912 1,197,482 Harmon Sept. 5, 1916 1,447,606 Seymour Mar. 6, 1923 2,274,902 Knight Mar. 3, 1942 2,407,028 McLean Sept. 3, 1946 2,455,369 Kuykendall Dec. 7, 1948 FOREIGN PATENTS Number Country Date 84,732 Switzerland Apr. 16, 1920