US1843267A - Miter box - Google Patents

Description

Feb. 2, 1932. T, BURDlCK 1,843,267

MI TER BOX Filed Jan. 8, 1931 EICLS /NVNTOR Thomas Burdick @QU/Zad dira/"nefs Patented Feb. `2, 1932 'UNITED STATES #PATENT omriies frHoMAs BURDIGK, on

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Application mea January s, 1931. serial No. 5072413.

This invention relates to mitering guides, and has for an object the provision of a miter box of such relativelyv small and compact design that it is readily portable, permitting its use 'by a workman in relatively inaccessible land unhandy locations and under Vsuch circumstances that -a miter box constructed in accordance with more conventional design Could not be employed.

A. morefdetailed object is the provision of a mitering guide in which the saw-guiding means is mounted upon a relatively small and compact bed adapted to be engaged upon a piece of lumber which is to be cut according to a predetermined angle and held thereupon in proper operative positionby one hand of the operator, while he manipulates with the other hand the saw which is guided by the mitering device, in such a manner that the timber is cut ait the desired angle.

Another object is to provide an improved 1design of saw-,guiding means for a miter A still further object is to provide a mitering guide having the above described characteristics, and which Vis adapted to have the guiding means adjusted with respect to the bed about a horizontal axis, as well as about a vertical axis, whereby double angles may Vaccurately be cut.

The invention possesses other objects and advantageous features, some of which, `with those enumerated, will be set forth inthe following description of the inventions particular embodiment which is illustrated in the drawings accompanying and forming a part of the specification.y

Referring to the drawings:

Fig. l is a perspective view of the mitering guide of my invention operatively associated with a timber, in such a manner as to guide a saw for the purpose of cutting the timber according to a predetermined angle.

Fig. 2 is a top plan view, the ldirection'of view being indicated by the arrow 2 of Fig.,

1and with a portion of the figure broken away to reduce its length.

Fig. 3 is a longitudinal view taken upon the line 3?-3 of Fig.v the direction of view as indicated. 'A porvertical sectional 2, withl MONTROSE, CALIFORNIA, ASSIGN'OR OF ONE-HALF TO ADOLF MILAR, 0F LA CRESGENTA, CALIFORNA v tion of this figure is broken away to reduce its length.

Fig. 4 is a view-similar to Fig. 3, but showing the saw guide swung about a horizontal axis, soas'to vary the angularitywith respect to the vertical of a cut made by a saw 5 miter boX precludes its being used to advantage under many circumstances, such, for example, as where a workman is required to work in relatively inaccessible and awkward locations. Such a condition frequently arises during the construction of a building when the roof rafters and other members are being cut and assembled. Because of the fact that a workman under suclicircumstances cannot have a work bench or a sawhorse easily available, he is required either to cut the timbers without the assistance of a miter box or to descend from his elevated position. carrying with him the timber to be cut, and after having cut the timber, climb back, carrying the timber with him inorder to assemble it in its proper location.

My invention seeks to overcome thisdisadvantage of theiconventional miter box by providing a mitering compact, light, and simplified lconstruction that it may easily bev employed by a work guide which is of such' istr man vat the location where the timbers areV to be assembled. With this object in view,

the bedV 1l of my improved mitering guide,

instead Vof being a trough or channel con-V ing intended that the operator-shall hold the 4tion is to be performed, as its support, it bei mitering guide in proper operative position with respect to the timber, with one hand, while he manipulates with the other hand the saw, which is guided by the miter device in such a manner as to cut the timber according to the desired angle.

The bed 11 comprises a relatively elongated strip 13, preferably of metal and having a flange 14 extending downwards therefrom along the forward edge of the strip. Hence, the strip 13 and flange 14 cooperate to define therebetween a right angle adapted to be engaged upon the upper forward corner 16 of the timber 12. YlChe flange 14 provided with extensions V17 at spaced: intervals therealong, preferably in the form of removable iingersof metal detachably secured the flange 14 and/or to the` strip 13 as by one or more machine screws 18. However, inasmuch as the extensions 17 are intended to cooperate with the flange 14 in holding the bed 11 accurately in parallelism with that face of the timber 12 with which the iiange 14 is in engagement, the extensions 17 are so constructed and mounted-that their after faceslie flush with the after face of the flange 14, this being accomplished by notching either the flange 14 to receive the extensions 1? ther-ein, or by notching the upper ends of each extension to receive the flange 14 therein, or by notching both.

A sector plate 21 is mounted for pivotal movement about a vertical axis adjacent one end of the bed 11. The means whereby the sector plate 21 is mounted is preferably a rivet, indicated in dashed lines at 22 upon F ig. 2, this rivet extending through both the strip 13 of the bed 11 and the sector plate 21, and having at least its'lower end, i. e. the end associated with the bed 1,1, countersunk so that it does not project-beyond the lower face of the strip 13.

The end 23 of the strip 13 with which the sector plate 21 is associatethinstead of being cut at right angles with the forward and after edges of the strip, is cut at an angle of substantially forty-live degrees (450), and the strip is widened adjacent the end 23V by an extension 24 from the after edge 26 of the strip, thereby presenting a relatively large area of the upper surface of the stripv 13 upon which the sector plate 21 is guided inpivotal motion about the axis of its pivot pin 22. y

A bracket 27, arcuate in form, is secured rigidly to the bed 11, and extends overthe arcuate edge 28 of the sector plate 21, so that a pin 29 Carried by the bracket 27 may be received within any one of a plurality of holes 31 which are arranged in the sector plate 21 adjacent the edge 2S thereof. The

arc within which the holes 31 are provided is' drawn about the axis Vof the pivot pin 22 as a center, with the result that any one of the holes 31 may be brought into registry with the pin 29 by adjustment of the sector plate 21 about its pivot pin 22. The pin 29 is slidably mounted Within a tubular housing 32 which is rigid with the upper surface of the bracket 2?, and is provided with a head whereby the pin 29 may be pulled upwards against the action of a coil spring 34 which is yunder compression between the top of the housing 32 and a pin 36 carried by the pin 29A within the housing. The parts are so proportioned and arranged that when the pin 29 is thus pulled upwards its lower end willi be retracted from the sector plate 21, permitting easy adjustment of the plate about Vits vertical axis,"after which the pin 29 may againbe engaged within one of the holes 31 to hold the'plate in selected position.

rllhe saw guide, indicated in its entirety at 41, comprises an elongated strip, preferably of metal, which is bent back upon itself along a transverse line 43 substantially midway between the ends of the strip, thus providing two parallel plates 44 and 46, spaced sutiiciently to receive a saw therebetween. ln order to impart rigidity to the plates 44 and46, beads 47 are formed therein and extend longitudinally thereof, i. e., the beads 47 extend vertically downwards from adjacent the line 43 of bending of the strip 42. A transverse bead 48 is also formed in each of the plates 44, 46 adjacent the upper edge thereof, and a bolt 49 extends through both plates 44,-46 at the central portions of the 'transverse beads 48. inasmuch as the bolt 49 is spaced onlyslightly below the line of juncture of the two plates 44 and 46, tightening ofthe nut 51 with which the bolt 49 is provided will result in pressing the plates 44 and 46 toward each other and into proper guiding relationship with a saw disposed therebetween. This feature makes it possi ble to hold the saw accurately and also to accommodate saws of dif'erent thickness. Preferably, both the forward and lower edges and 53, respectively, of both plates 44, 46 are flared outwards slightly, so as to facilitate recipr cation of the saw between the plates without damage to the set of the saw teeth.

, The saw guide 41 is mounted upon the sector plate 21 for adjustment about a horizon-tal axis with respect thereto, this being accomplished by means of a pair of spaced lugs 56 extending rigid-ly upwards from the sector plate. 21 along its. after radial edge, and another pair of lugs 57 extending rigidly from the plate adjacent its lower edge, with a suitable pivot pin 5S extending through all 'the lugs 56 and 57. Means are provided` for releasably clamping the saw guide 41 in selected degree of anoularity with 'respect' to the sector plate 21. Qljreferably, this clamping means is in the form of an arcuatey telescopic tube 61 comprising Jthree sections 62, 63 and 64, each of which is rectangular in crossV section. The largest section 62 is made fast at its lower end to the sector plate 21, and the smallest section 64 is made fast at its outer end tothe plate 44 of the saw guide 4l. The intermediate section 63 is provided with arcuate slots 66- in its opposite sides, and bosses v67 are formed on the inner sides of the largest section 62 and are slidably received within the slots 66, so as to limit outward movement of the intermediate section 63 from the largest section 62; Similar bosses 68 are also formed on the outer surface of the smallest section 64, these bosses also being slidably received within the slots 66, so as to limit outward movement of the smallest section 64 with respect to the intermediate section 63. The parts are so'proportioned and arranged that relative motion between the sections 62, 63 and 64 vis resisted by the frictional engagement of the sections with each other. l-Iowever, a set screw 69 is-threaded through theV largest secti-on 62 adjacent its upper end, whereby the sections 64 and 63 may be firmly clamped in completely telescoped position within the largest section 62.

I prefer to provide each of the holes 3l of the sector plate 21 with an indicium 7l, preferably in the form of a numeral indicating the degree of angularity of the saw guide 4l with the longitudinal axis of the bed 11 when the pin 29 isengaged within the associated hole 3l. In this manneran operator is enabled to set the saw guide accurately, so as to cut a timber 12 along a vertical plane disposed at a predetermined angle with respect to one of the edges of thetimber. However, in view of the fact that the holes 31 must necessarily be spaced a material angular distance apart,`I have provided an auxiliary locking means in the form of a set screw 7 2 threaded through the bracket 27 in position to engage the upper surface of the sector plate 21 and clamp it in selected position, even though none of the holes 3l lie in registry with the spring pressed pin 29.

If it be desired to cut a double angle the saw guide 41 may also be adjusted about the horizontal axis of the pin 58, as illustrated on 4 and 5. @wing to the rigidity imparted to the plates 44 and 46 .by means of the beads 47 and 48, tightening the nut 51 results in pressing the plates 44 and 46 towardv each other and into guiding engagement with a saw which is disposed between the plates, thereby insuring that a cut made with the saw will coincide in degrees of angularity with that face of the timber 12' with which the flange 14and/or extension 17 are in engagement, with the numeral 71 associated with the hole 31 with which the pin 29 is in engagement.

It is to be understood that the details of the invention as herein disclosed, are subject to alteration within the spirit or scope of the appended claims.

I claim: Y v v l. Amitering guide comprising an elongated bed having a rigid flange extending downwards therefrom along Aits forward edge, a plate mounted adjacent an end of said bed for pivotal movement about a vertical axis',` saw-guiding means carried by said plate, means for releasably clamping said plate to said bed with said guiding means in selected angular relation with said bed, and extensions removably secured to said bed at spaced intervals therealong, the after faces of said extensions being flush with the after face of said iange.

2. In a mitering guide, saw-guiding means comprising an elongated strip bent back upon I itself along a transverse line to present a pair of substantially parallel plates joined along their upper edges, each of said plates having beads extending longitudinally thereof to increase their rigidity, and means adjacent the upper edges of said plates for pressing the plates toward each other into guiding engagement with a saw disposed therebetween.

3. In a mitering guide, saw-guiding means comprising an elongated stripbent back upon itself along a transverse line to present a pair of substantially parallel plates joined along their upper edges, each of said plates having beads extending longitudinally thereof to increase their rigidity, a bolt extending through both plates and spaced slightly below their joined upper edges, and a nut threaded onto said bolt and adapted to press said plates towardV each other into guiding engagement with a saw disposed therebetween. Y n

4. In a mitering guide, saw-guiding means comprising a strip bent back upon-itself to present a pair of parallel plates joined along their upper edges, each of said plates having beads extending longitudinally thereof to increase their rigidity, a transverse bead formed in each plate adjacent the joined edges thereof, a bolt extending through said transverse beads, and a nut threaded onto said bolt and adapted to press said plates toward each other into guiding engagement with a saw disposed therebetween.

In testimony whereof I have signed my name to this specification.

vTHOMAS BURDICK.

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