US1708345A

US1708345A - Portable power-driven tool

Info

Publication number: US1708345A
Authority: US
Publication date: 1929-04-09
Anticipated expiration: 1946-04-09

Description

APHl 9, 1929- O. P. WODACK ET 'AL PORTABLE POWER DRIVEN T001.

2 Sheets-Sheet Filed June ll, 1926 April 9, 1929 o. P. woDAcK ET AL 1,708,345

' PORTABLE POWER DRIVEN TOOL Filed June 11, 192e 'l 2 sheets-sheet 2 Patented Apr. 9, 1929.

UNITED STATES titane PATENT orifice.

OSCAR P.; WODACK, OF CHICAGO, AND JOSEPH F. HAAS, OF FOREST I JARK, ILLINOIS, ASSIGNORS TO WODACK ELECTRIC TOOL CORPORATION, OF CHICAGO, LLINOIS, A

CORPORATION OF ILLINOS.

PORTABLE POWER-DRIVER' TOOL.

Application led June 11,

rThe invention relates to portable power driven tools, and more particularly to port able power driven circular saws.

One object of the invention is to produce a portable power driven saw having a supporting structure including a motor Casing, with a guide rest through which the saw blade projects, and means adjustably connecting the guide rest to the supporting structure so as to permit the angular relation of the guide rest and motor frame to be varied at will7 and also the depth of cut to be changed as desired.

Another object of the invention is to provide a portable power driven saw having a support-ing structure equipped with a carrying handle, and a guard automatically movable into and out of operative relation to the saw blade when the tool is removed from the work and suspended by the handle, thereby protecting the user when carrying the saw from place to place, and furthermore providing a protective rest for the saw when notl in use.

Further objects and advantages of the invention will become apparent as the description proceeds.

In the drawings:

Figure 1 is a side elevation of theinvention in its preferred form.

Fig. 2 is a plan View thereof.

Fig. 3 is a view taken from the side opposite to that of Fig. l, showing, in dotted lines, a pivoted position of the saw frame.

Fig. l is a section along the line ll-l of Fic. 1.

Fig. Fig. 2.

Fig. 6 is a section along the line 6-6 of Fig. 5.

Fig. 7 is an enlarged view of a portion of the tool rest and guide.

Fig. 8 is a section along the line 8-8 of Fig. 7.

While we have shown in the drawings and will herein describe in detail the preferred embodiment of the invention, it is to be understood that we do not thereby intend to limit the invention to the specific form disclosed, but aim to cover all modifications and alternative constructions falling within the spirit and scope of the invention as eX- pressed in the appended claims.

5 is a section along the line 5-5 of 1,926. Serial N0. 115,226.

ln the form selected for purposes of disclosure the invention comprises an electric motor housed in an aluminum casing 1, one end shield 2 of which extends axially therefrom in the form of a tubular shell 3 to provide a support for a bearing member il, these parts being secured rigidly together to form a frame for theV tool. At the op posite end of the motor casing 1 an end shield 5 is formed integrally therewith to provide a bearing for the armature shaft of the motor andto partially enclose that end of the casing. Apertures 6 in this end shield permit air to enter for Ventilating and other purposes.

A handle 7 rigid with the motor casing l, carries a rectangular boX 8 which is formed in the upper portion of the handle and serves to house a switch (not shown). The switch is preferably operable by means of a trigger 9 positioned conveniently to the forelinger of the hand of an operator, manipulation of this trigger closing the switch to connect the motor terminals to the power lines in a cord 10.

The end shield 2 at the saw end of the motor frame has a circular plate or disk portion 11 secured to the frame by means of set screws 12. The tubular shell 3 hereinbefore mentioned as being integral with this end shield, extends axially outward from this disk portion, to support the bearing member 4. This member is shown in the drawings (Figs. 5 and 6) in the form of a hollow rectangular block having an end wall 14, a top wall 15, a bottom wall 16, and a rear wall 17. A detachable cover 18 is secured thereto by means of bolts 19.

The member 4ris secured to the shell 3 by means of bolt-s 2() passing through apertures in an end flange 21 on the shell and into threaded engagement with the block. A cylindrically formed tubular member 13 proi jecting beyond the flange 21 is adapted to lit snugly within a bore 13L in the block il. As shown in Fig. 5 the member 13 and the end wall 14C form supports for a pair of ball bearings 22 and 28m which a shaft 24E is journaled. This shaft extends through a bore 25 in the member 13 and into the shell 3 to a point adjacent the end of the motor shaft 26. The ends 27 and 28 of these shafts are preferably squared. off. and connected by i to means of an internally squared sleeve coutiling-29k This coupling is suleiently rigid to permit the bearings of the shaft 24: to act as a support for the saw end of the motor shaft. f j

A saw arbor 30`is journaled in the block 4 in ball'b'earings 31 and 32 at right angles to the shaft 24. This arbor has a Worm gear 30a keyed thereto which meshes with ay Worm 2li@ on the shaft 24 whereby to estab lish a driving connection between the motor and saw arbor. The bearing 3l is supported in a-cup shaped projection 341-: on the inside of the cover 178, and the bearing. 32 lis supported similarly in the rear Wall 17 or the bearing block. f

In portable tools any vibration suchv as caused by an imperfect dynamic balance ot As illustrated herein this saw mounting comprises a yioldable means supporting the saw ont'he arbor. Thus a saw 38 is clamped betiveencollars 3Ta11d40, the collar 37 hav ing a sleeve portion 37a upon which the saw and collar 4()V may be positioned. A: nut 401. engaging sei-ev7 threads on the sleeve 37a serves to-clamp the collars andisaw'together. This sleeve portion 37CL of the collar is adapt'- edl to fit over the. outer endo the arbor and against a shoulder 33a for-med byA an` enlarged portion 33A of the arbor Which is adapted"4 to rotatefreely Within a bere 35 `through the rear Wall 17 of the bearing block and Within an annular' flange 36 eX- tending therefrom.A A yieldablebushing 39 of rubber-or other suitable material is interposedbetfieen the arbor and the sleeve 37 to permit radial'movement of the saw relative to the arbor. A pin 731entered'through

concentric apertures

74, 75 and 76 inthe collar 37%, buslling 39 and arborfl() respeef tively, is held in place by thesaw and cellar' 40. The apertures 74 and', 75 are slightly larger than the pin. In this Way the collarsB'Tl and 40 andthesavv 381cla1'nped therebetween lare free tofloat radially on 'the arbor scthat it this unit is not perfectly balanced' it may find its center7V androtate thereabout. A pm 37Abr carried upon 4thecollar37'is adapted to enter apertures 38d andY a substantially semi-.circular ring 4t2' oE Us shaped cross sectionk adapted .to overlie the edge of thesavv. Integral inwardly extendingarms 43, 44 and l5 carry a hub tvwhieh is supported on the frame'of the tool. hub has a central bore 4:7 adapted to engage Va bearing surface t8 formed enthe'outside ing a pair of lugs 4.9 and' 50 extending out- 1 Wardly from the hub- 'adjacent a slit 51 thereinso to permit a set screw 52; which passes freely through an aperture in one lug and into threaded engagement Vwith the other, to clamp the hub on the annular' liange. y

Means is also provided in the form eta tool rest to support and guide the teol relative tothe wor-k being cut. For this purpose a slot-ted plate Vor frame 53 (Fig. 2) formed with av pair oit ribbed side members 5d and end members 55, is urovid'ed with Aupstanding arms 56 on opposite sides oiE the saw which rareadjustably connectedV with the saW guardl'tl. The trame is ot a size adaptedtov surround the saw diametrically to permit the saw toprotrude therethrough- The adjustable connection between the arms 5G and the saw guard comprises a bolt 57 anf chored in the arm on one sidey of the guard, anda boltl 58 anchored in a dow1 Wardly Aextendingv bracket 59 on the opposite side 'of the guard, these beltsbeing` adapted to enter longitudinal slots 60 in the arms 56. lVing'nutsGl and Washers G2 are'provided on these bolts te clamp the arms against the guard, thereby to seeure the support in its adjusted position relative tev the guard.

lVhen the saw is to be used for cutting` strips a guide edge (i3 maybe attachedto-the frame vFor this purpose `lugs Gfl are This Y formed; onythe trame 53, adaptedto receive j the threaded ends of cap screws tlwvhich pass through apertures in the edge'i3 to clampthe-edge to the irame. z g

A handle 66 for the left hand of thejoperator, is preferably provided te permit oit ready manipulation of the tool; Thi dle, as illustrated herein, has an extending bracket (37 whichis secured lo the` motor frame by means ef set screws' G3.

It will be apparent ,from the foregoing description that the frame oi the toolmay swing in the plane ol 'the saw to permit the tool tot be used in restricted spaces. Thus the angular adjustment ofV the saw'guard -is possible Without reducingthe depthfeii cut obtainable Vith the saw,4 y

It .will also be apparent thatw-ith thet-eol restsecured to thefpivoted guard, the tool mayy be inclined vwith respect tothe Work Without Vdisturbinfg' the,A adjustment of! the tool rest .relative to: the saavv axis.; This s ipfoases particularly desirable as it greatly simpliiies the adjustment and manipulation et the tool.

A flexible conduit 69 may be secured at one end to the motor casing l of the motor traine by means of a iitting (S9a to communicate with the interior of the trame at a point adjacent the discharge end of a 'fan 70 (Fig. 3) which is suitably secured to the motor shaft. rllhe other end 7l of this conduit isi adapted to be placed in a position to discharge air from the 'ian to blow the saw-dust away from in front of the saw. rllhis conduit is preferably of a spiral metallic type adapted .to remain in its adjusted position without the use of aclainp adjacent its tree end. As apparent from the drawing, it the tool is inverted the fitting 69a, the guard 4l and the switch boX 8 are adapted to serve as a three-point support for the tool and permit of its use as a saw bench.

lhen a tool oiI this type is not in use, it is customary `for the operator to carry it from place to place by holding the handle 7 in one hand and permitting the tool to hang vertically. This method of carrying the tool Otten results in the under side of the saw blade swinging against the leg of the operator.

on the rear endet thel frame 53 of the tool rest. As shown in Fig. l this guard, when the saw is in use, is swung up so that its free end is supported upon the work and the guard trails the tool rest. Whom however, the saw is withdrawn 'from the work and the tool is held wit-h the handle 7 uppermost, the guard 78 swings by gravity to the dotted line position wherein it hangs adjacent the projecting portion ot the saw, an adjacent portion Sl of the frame 53 being adapted to engage the edge of the guard to prevent the guard from rubbing against the saw. Thus the guard eiiectively protects both the saw and the operator from injury.

The means for yieldably- `mounting the saw blade on the arbor is not herein claimed, the saine having been made the subject ot divisional application Serial No. 175,651 tiled March 16, 1927,1by Joseph F. Haas.

lWe claim as our invention:

l. A portable power driven tool ot the character described comprising, in combination, a trame, a motor having a casing rigid with the frame, a saw arbor journaled on said frame, driving means connecting the motor and said arbor, a saw guardcarried pivotally on said .traine so as to be swinga-ble about said arbor while overlying the upper edge of a saw blade on the arbor, and a tool rest carried adjustably on aid guard.

2. A portable power driven saw comprisa main body having a handle at one crdi` and means for supporting a circular saw to rotate on a transverse axis at the other end et the body, a guard for the saw, and a rest carried by and adjustable toward and from said guard, said guard and body being relatively adjustable about the axis ot the saw to permit a variation in the angular relation ot the body to the rest.

3. ln a portable power driven tool ot the character described, the combination of a trame, a handle at one end of the trame, a saw arbor journaled in the other end ot the trame, a saw on said arbor, and a guard for the unde ide of said saw, said guard being mounted so as to be movable into an inoperative position when the tool is in use and adapted toy gravitate into an operative position relative to the saw when the tool is vertically supported with the handle uppermost.

Il. In a portable power driven tool having a circular saw, the combination oit a saw guard pivotally adjustable about the axis of said saw, and guiding rest carried by said guard, said rest'being' mounted for adjustine-nt substantially radially from said saw axis.

5. ln a portable power driven tool having a circular saw, the combination of a saw guard pivotally adjustable about the aXis of said saw, and an adjustable guiding rest having 'front and rear support on said guard permitting variable positioning ot said rest relative to the airis of said saw.

G. ln a portable power driven tool, the combination ot a saw, la supporting traine having a handle, a relatively fixed guard extending about the cutting edge of said saw excepting the normal cutting portion thereof, and a second guard pivotally supported between said handle and said saw whereby said second guard swings into a trailing position free of said saw when the latter is in normal cutting position and swings adjacent the exposed cuttingl portion et said saw when said supporting 'frame is suspended by said handle.

7. in a portable power driven tool the combination of a saw, a supporting frame for said saw, a relatively iixed guard extending about the cutting edge of said saw excepting the normal cutting portion thereof, a guide rest mounted on said ,guard and having the cutting portion of said saw extending thereby, and a second guard pivotally supported to be swung tree ot said saw by the worlr being operated upon, and adapted to gravitate into protective relation tothe cutting por-tiony or said Saw when said Supporting Vframe is carriedvvith said saw irl-suspended position.

8. In a portable power driven tool the` combination of a saw, a supporting frame, a relatively stationary guard extending about the cutting edge ot said saw excepting the normal cuttingportion thereoi, a guide rest mounted on aard guard and having the cutting portion of said saw extending thereby, and a second guard pivoted on said guide vrest and normally positioned in adjacent protective relation to the cutting portion oit said saw, said second guard being adapted to be swung `ree of said saw by the work being operated upon.

9. A. portable power driven tool having, in combination, a saw blade, a supporting structiue on which said blade is mounted and including a guard extending about the cutting edgev of the saw blade cxeeptingllie normal cutting portion thereof, a guide rest structurer on which said blade is mounted and includingy a guard extending about the cutting edge olthe saw blade excepting the normal cutting portion thereof, a' guide rest `mounted on said structure in operative rela tion to the saw blade, and a second guard pivoted on said rest'so as tobe slidable in a trailing position upon the surface of the work being eut,lsaid second guard having a part adapted to engageA with theV rest to limit the swinging movement of the guard toward the saw blade. Y

lvl.V A` portable power driven saw comprising arsupporting structure including a n-p tor easing, a handle rigid with one end of the casing, a saw arbor journaled trans# versely in said supporting structure at the other endof the `casing and adaptedto car-ry a saw blade, said supporting structure in-V cluding an arcuate guard for the upper portion ofl the saw blade,` a guide rest inthe 'form of an elongated plate* having a slot therein through which the lower portion of the sawblade projects, means adjustably connecting thel guide rest to the supporting structure, and a second guard pivot-ed to saidy guide rest at the en d thereot adjacent the motor easing'and adapted to gravitate into protective relation to the' bladewhen vthe saw is suspended by the handle. 1

In testimony lwhereof we have hereunto aliixed our signatures.

osoAR- rp wonnen.` Josnrn F. Haile.