US2535491A - Stroke saw - Google Patents

Description

Dec. 26, 1950 c; FELTON 2,535,491

STROKE SAW Filed April 14, 1947 '3 Sheets-Sheet 1 WITNESSES I N V EN TOR:

ATTORNEYS.

Dec. 26, 1950 c, FELTON 2,535,491

STROKE SAW Filed April 14, 1947 5 Sheets-Sheet 2 Pizza ai'ezm,

W Y W BY W W ATTORNEYS.

WITNESSES P. C. FELTON STROKE SAW 5 Sheets$heet 5 Filed April 14, 1947 I N V EN TOR:

[may] aimm, W W

WITNESSES 9434);

A TTORN E Y5 Patented Dec. 26, 1950 [1N1ZI'EED iiS STROKE -'S-AW Bhilip .C. Felton, Norristowmfa.

A ;plicaticn-April 14, 1947fSerial No. 7411158 straight clean cut to the point-desired and is easily retracted for a repeat of the operation from adifferent 'ang-le withresultant-production of a sharply defined corner needing no subsequent trimmmg orsquaring.

-'A further object of thi inventionis to pro- -=vide a portable stroke-saw of the species above defined; in which *the powerunit isso located that it may serve as a fulcrum "or pivot about which sa-id' -unit is easily turnedin-eitherdirectionto effect undulata-or-curvilinear cuts of-any desirable ra'diusby thesimple expediento'f using aiiiiferent W-iHthnf-saWbIade.

A still further object of my invention is taprovide a portable stroke-saw; preferably usablefor top 'surfacework sothat'the weight thereof materially augments its efiiciency.

"While the iforegd-in'gcdefinitions "-are indicative, .in'afgeneral way, :of the "aims ofrmyinvention, other objects with ancillary advantages -wi1l"be evident, *org'laterron "herein noted, to those skilled intheart uponta full understandin'gnfthecon- 'struction, arrangement and operation of "the means ."hereina'fter fully disclosed; while "it "will also"'be appreciated that my invention is "susceptible of .other embodiment or *structurally'modilied forms coming equally within "the ctermsanld scope otthe concluding claims.

TIn the drawings- Fig.1, SheetSLiis aperspective view..o'f atypical andupoitable stroke-saw constructed in-accorid- .ancewithmyimprovements.

:Fig. f2,.Sheet 22,.iswaljtop; plan'view. of the portable:strokeesaw.

Fig.13lisganen'd elevationsof thelsame as viewed ilooliingifromttheilft towards the rightihand'side thereof.

111g. jri fiheetifipisia 'sidelelevationnf :.the,- porit-,- fiahle .stroke-osaw gas wiewedilodking ;at the a rightlhaniissideitlsemof.

"-FigJ SISheet 2, is a broken sectional elevation taken on the plane designated by the angled arr0w -V"-V, in -Fig. '14, and :drawnto a larger scale for c-learer illustration of structural details.

Fig. 6, Sheet 1, is a plan section; taken-asindicated=by the angled "arrows VI- VI in Fig. 4;also drawn to t-he same scale aslFig. 5 and "for-like Fig." 7,-Sheet 3, isa local sectioncn the plane VIIVII- in Fig. 4.

Fig. 8,-'-S-l 1eet'*3,"is a sirnilar section on the plane VIII"-VIIIof Fig. 4.

FigxQjSheet 351s afragmentarysectional elevation *taken approximate'lyas indicated by the *angled arrows-IX-JX tcthe left-hand of Fig. 5;

and

Fig,' =10, Sheet 1,'is a perspective view ofaguide elementhereinafterfullyexplained.

""In "describing the form of my invention *exemplified by the accompanying three sheets of illustrative drawings specific terms will'be employedfor the sake ofclarityjbutit is to beun der'stood the-scope of-saidinvention isnotthereby limited, each --such term being intended to embrace'all'equivalentswhich perform the same function for an analogous purpose.

Referring more particularly to the drawings the rference character I Fdesignzttes arectangular base '01" *platform conveniently, althoughnot essentially, "of hard wood, to the under side of which are rigidly attached side and "an inter- 'mediatewunner or skids 12,42, and i3 respectively, filikewise made of wood with the grain lengthwiseand having'the ends rounded at M. These "skids 12, I 2 and I3 are preferably protected -on their active faces with Wear-resistant metal strip 15 secured thereto in any suitable "manner; while itis tobe remarked that the-platform =11 is provided with "a rectangular cut-out +5 atoneside-intermediate the ends thereof, for reasons later-on-'herein-'made"clear.

' Proj ectingupwardly 'from,'and rigidly attached to; the pl atform t !is an upright, member I I, also of Wood, "the same being further rigidifie'd by metal braces I8, i9 "appropriately'held in place by wocfd screws 29, and "respectively connecting ffromthe-said member I! tothe platform It :and the right handside skid l2,-as clearly-shown Figs. l-3, more particularly. The upright. member ,ll,.it isto-be..remarke'd, is of special formation to embody aiorwar'dor main section .Zl with a ,,rear\vardlyextending or approximately horizontallhand-;g1'a s p"22, whereas the 'frontedge innmdesalower.verticaLpartlZS:andanupperrearwariilyiinclined .,part?2i4. LOncthe other; hancLzthe 'reariedgelofltheimemher l lincludes aiorwardly inclined upper part 25 above the hand-grasp 22, and a concave curvature 26 merging from said grasp to the rear edge of the platform H. In addition to th metal braces l8, IS, the upright member I! is, preferably, fitted with an inverted L-shape reinforcement 21 of wood, conveniently at the left-hand forward side, in order to provide adequate support for a metal bearing block 28 appropriately secured in place by a bolt 29 and a lag screw 30, for example, with associated washers 3|.

Journaled in the bearing block 28 is a shaft 32 the relatively projecting reduced portions 33, of which are screw-threaded for application of locknuts 35 and clamp-washers 36, whereby a single, or multi-grooved drive-pulley 3'! is securely fixed to the portion 33, and a fiy-wheel 3'8 correspondingly mounted on the portio 34 with a spacer collar 39, made fast by a set-screw 60 intermediate the wheel 38 and the bearing 28. It is to be remarked that both the grooved pulley 31 and the fly wheel 38 may be made of wood, for a reason hereinafter set forth,

The multi-grooved pulley 3'5 is conveniently =co-ordinated, as by one or more round section leather belts 4|, to a similarly-grooved small pulley 42- fast on the outer end of the drive-shaft 43, of a motor 44, connected fromany conveniently located outlet or source of electric current supply-mot shown-by a conductor 45 to a snap switch 66 whereby the current is turned on and off, such switch 46 being conveniently located, as shown, for easy manipulation by the fingers of the operator of the stroke-saw, as readily understood by those conversant with the art.

The motor 44, is suitably mounted on a wood or other material base 41 which, in turn, is seated on the forward portion of the platform II and rigidly secured thereto by aid of hold-down bolts 48 with lock washers 49; while provision is made for accurate adjustment of said motor with its pulley 42 to properly align in respect to the drivepulley 37, by aid of passing bolts 48 through suitable slots 50, Figs. 1 and 4, formed for the purpose in the parts H and 41.

Appropriately rabbeted at see Figs. '7 and 8, into the upright member I! is an angularly related post 52 having upper and lower relatively stepped portions or metal spacers 53, inwardly of the ends of said post, as indicated at 54 in Fig. 1; said spacers being rigidly held in place by countersink headed through bolts 55 and an intermediate bolt 55 engaged through the parts 52, I! only as best understandable from an examination of Fig. 5, more particularly. Attached to the face 54 of the spacers 53 with capacity for lateral adjustment, as later on herein pointed out, are a pair of vertically directed guide elements 55, said elements 56 being held in position by aid of screw-bolts 57 threadedly engaging holes 58 in the elements 55 with free passage through larger diameter holes 59 in the spacers 53, and beyond which they are equipped with clamp-washers and lock-nuts 55; it being understood the post 52 is regionally notched out at 6! to accommodate the parts 55 and to enable release or tightening-up of the latter, in an obvious manner.

Reciprocatively-engaged, by opposed grooves 62, Fig. 8, intermediate the confronting edge portions of the guide-elements 56 is a slide 63 having a fulcrum-stud 8 threaded therein and, to the outer portion 65 whereof is pivotally connected, by aid of a metal bushing 66 with associated washers 61 and a cotter pin 58, the lower end of a wood bar or pitman 69, in turn similarly pivoted,

by corresponding means 65'-68, to the flywheel 38 in excentric relation to the axis of rotation of the latter. At this juncture it is noteworthy that the respective ends of the pitman 69 are longitudinally-cut inwards at 15 and fitted with clamp-means H to restrain the bushings 65 against displacement; while it is further observable that the fly-wheel 38 is, preferably equipped with a metal counterbalance 12.

A conventional type saw-blade 13 having the forked end 14 divergently tapered at 75 for abutment against the flange 16 of the proximately related fulcrum-stud 64; while said blade 13 is secured in place by a screw-stud and lock washer 11; the former 64 of which is threadedly engaged in the slide 63 at 1'8, Fig. 5. In addition the sawblade 13 is further constrained to direct strokeaction by means of a guide element or plate 19 having a slot through which the back portion of said blade is reciprocated; while said plate is conveniently secured to the lower end of the post 52, as by screws 8!, in an obvious manner, see Figs. 1, 5 and 6. A steadying handle 82 is con veniently secured to the left-hand side of the upright member I I While 83 is a carrying-handle for the device, said handle 83 being preferably secured by screws 84 to the inclined edge of the member ll. Attention is also directed to the fact that the ends of the respective guide elements 56 are preferably provided with suitable means, conveniently in the form of small diameter throughbolts 85 having lock-nuts 85, whereby said elements 55 can be accurately adjusted and maintained in coactive operating engagement with the slide 63, as readily understood by those conversant with the art.

From the foregoing it is thought the merits and advantages of this invention will be readily apparent, while it is obvious that by making most of the parts from hard-wood with metal being used on y, where necessary, that I have provided a portable and comparatively light-:weight strokesaw that is just as serviceable in the field, or at a building operation, as it is in the shop. As a matter of fact, when constructed as described, the device complete with a quarter horse power electric motor does not exceed thirty-five pounds in weight, i

In use, the operator simply marks out the cutting work desired on the rough or finished lumber, places the saw in position thereon for starting the cut, grasps the steadying-handle 82 in one hand, snaps the switch 46 to the on position and then guides the blade 13 by taking hold of the grasp 22 with the other hand, and pushes the device as a unit with the blade 13, reciprocating vertically, along the plotted line or lines in an obvious manner. It is to be a so particularly noted that by positioning the saw-blade 13 as shown and described it positively operates with a straight stroke, free from vibratory defiection while the guard-plate 19 effectively obviates the accumulation of saw-dust about the blade 13 and thereby effectively prevents the kerf cut by said blade from getting choked up with dust. It is still further noteworthy that by my invention I provide a portable stroke-saw which can be economically built, that will be found to be a great money and time saver in the wood working and building trades inasmuch as, heretofore, the preparation and cutting of rough horses and other kindred lumber pieces has invariably necessitated the service of two or more men, whereas my device is easily and efiiciently operable by one man. Again my device further eliminates the need for the use of expensive band or skill-saws, as well as the dangers incidental to their usage, in the preparation of rough horses and so forth in building operations; while the unit can be used at the scene of an operation and thus avoid truckage costs, as well as expensive mill-work. Still further it is apparent my improved stroke-saw is equally usable for truing the rough ends of flooring boards, studding, joists, rafters, and so forth at the operation.

Finally it will be readily appreciated from the foregoing disclosure that by my invention I have provided a device in which the several objects recited are achieved, and which is well adapted to fully meet the conditions of practical use. Accordingly, as various other possible embodiments of my invention may be made and structural changes adopted, such for instance as the substitution of light metal for hard-wood, it is to be I understood that all matters hereinbefore set forth and shown by the accompanying drawings are to be construed as exemplary and not as limitative.

Having thus described my invention, I claim:

1. In a portable stroke-saw the combination of a platform with spaced runners or skids thereunder and an opening in one side thereof, a motor secured on the forward portion of the platform in advance of the side opening, and said motor being of a size or weight effective to serve as a fulcrum or pivot about which the strokesaw is turnable in either direction; an upright member lengthwise of the platform including a rearwardly extending manipulator hand-grasp and a laterally projecting steadying handle at one side thereof; brace elements rigidly securing the upright member to the platform and supports; means at one side of the upright member affording reciprocatory attachment for a saw blade, and a guide element at the lower end of said member for the back portion of the blade; means at the other Side of the upright member jointly affording, with the top of said member, firm mounting for a stationary bearing; a shaft journaled in the bearing with a drive-pulley at one end and a fly-wheel at the other end; connector means coupling the fly wheel to the sawblade reciprocatory attachment; and means operatively coordinating the drive-pulley to the output shaft of the power motor.

2. The invention of claim 1 wherein the upright member is formed to embody a forward main section and a rearwardly-extending handgrasp; wherein the front edge of said member includes a lower vertical portion with an upper rearwardly-inclined part; wherein the rear edge of the member aforesaid includes a forwardlyinclined edge above the hand-grasp with a concave curvature below the latter merging to the rear edge of the platform; and wherein the upright member further includes an inverted L- shaped side reinforcement and an opposing angular rabbeted post portion.

3. The invention of claim 1 wherein the drivepulley is in the form of a multi-grooved disc; and wherein the fly-wheel is in the form of a disc having an inset counter balance.

4. The invention of claim 1 wherein the means connecting the fiy-wheel to the means affording reciprocatory attachment for the saw-blade is in the form of a pitman; wherein each end of said pitman includes a bushing; and wherein laterally adjustable clamp means are fitted across the pitman ends to prevent displacement of the bushings.

5. The invention of claim 1 wherein the means affording reciprocatory attachment for the sawblade comprises a slide embodying parallel grooves; wherein stationary spaced guide elements engage in the slide parallel grooves; and wherein adjuster means are provided across the ends of said guides.

6. The invention of claim 1 wherein the guide element for the back portion of the saw-blade includes an open-ended slot; and wherein said element is secured to the lower end of the upright member blade adjoining reciprocatoryattachment supporting means.

PHILIP C. FELTON.

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

UNITED STATES PATENTS Number Name Date 105,767 Bailey July 26, 1870 578,382 Wolf Mar. 9, 1897 871,142 Power Nov. 19, 1907 902,656 Heno et a1. Nov. 3, 1908 1,136,842 Siegel Apr. 20, 1915 1,303,728 Rogatchoff May 13, 1919 1,445,820 Breth Feb. 20, 1923 1,475,453 Shinn Nov. 27, 1923 1,620,374 Maloney Mar. 8, 1927 1,643,721 Meyer Sept. 27, 1927 1,648,008 Selby Nov. 8, 1927 1,826,188 Pickering et al Oct. 6, 1931 1,955,350 Sweet Apr. 17, 1934 FOREIGN PATENTS Number Country Date 465,535 Great Britain May 10, 1937

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