US2046404A - Miter box - Google Patents

Description

July 7, 1936. w. OWEN 2,046,404

MITER BOX Filed April 6, 1955 4 Sheets-Sheet 1 A TTORNEYS.

W. OWEN MITER BOX July 7, 1936.

4 Sheets-Sheet 2 Filed April 6, 1935 W. OWEN MITER BOX July 7. 1936.

4 Sheets-Sheet 3 Filed April 6, 1955 43 I INVENTOR.

WILL/HM OWEN ATTORNEYS.

July 7, 1936. w. OWEN 2,046,404

MI TER BOX Filed April 6, 1955 4 Sheets-Sheet 4 INVENTOR.

WILL/HM O WEN A TTORNEYS.

Patented July 7, 1936 UNITED STATES MITER BOX William Owen, Pittsburgh, Pa., assignor to Pittsburgh Plate Glass Company, a corporation of Pennsylvania.

Application April 6, 1935, Serial No. 14,987

4 Claims.

The invention relates to a miter box for use in cutting metal sash and the like, which is formed either from sheet metal or by extruded metal to form strips of the desired cross section. One ob- 5; ject of the invention is to provide a cheap, simple construction having improved means for clamping the work in position and adapted to permit two strips to be mitered at the same time. Further objects are to provide improved means for 10. setting the device to the desired angle of cut so that the adjustment may be made accurately and quickly, and for guiding the hack saw in a positive manner during the cutting operation. One embodiment of the invention is illustrated in the 15. accompanying drawings, wherein:

Figure 1 is a plan view of the device. Fig. 2 is a section on the line II-II of Fig. 1. Fig. 3 is an end View of a part of the construction. Fig. 4 is an enlarged partial section on the line IVIV 20 of Fig. 1. Figs. 5 and'6 are detail views showing the blocks which are utilized in clamping the work in position. And Figs. 7 and 8 are detail I views of the setting gauge which is employed in adjusting the device. 25 The base member of the device on which the I work holder or deck is mounted for rotary'ad? justment comprises a 'pair of plates I and. 2 in the form of a cross and on this base member are mounted the guides for the frame of the hack saw. These guides consist of the pairs of rectangular tubes 3, 3 and 4, 4 welded at their lower ends to the plate I. Adapted to fit snuglybetween these pairs of posts is the frame of the hack saw. The frame consists of a top member in the form of a rectangular tube'and a pair of bottom members 6, I also in the form of rectangular tubes, secured together by means of the plates lb and la welded to the ends of the tubes, and by the rectangular tubes 8 and 8a welded at their 40 ends to the tubes 5, 6 and 'The plate 1a is bent, as indicated at 9, in order toprovide a handle, the rear portion of which carries the rounded wooden'strips ID to fit the hand of the operator. The hack saw II is secured at its front end to the frame by means of a pin l2 and at its other end is attached to a block |3 by means of the pin I4, the block |3 fitting slidably in the frame member This block is adjusted to the rear to tighten the saw by means of the rod |5 which extends tothe rear through the plate 1a and carries on its threaded rear end the wing nut l6. Stops for limiting the downward movement of the saw frame are provided in the form of the members I! and I8 lying between the pairs of tubes 3, 3 and 4, 4 and welded thereto, such stops 33 providedat its centerwith a slot 34 in'alignbeing provided at their forward edges with saw cuts |9 which act as a guide for the gauge used in connection with the apparatus, as later described. l

The work holder or deck whichlis mountedfor rotary adjustment on the base member comprises a plate having a hub 2| at its center and the flanges 22 and 23 on each side. of the hub. Ex.- tending tothe right from the flange 23 isfthe arc-shaped extension 24 provided .onits edge 10 with the graduations 25 (Fig. 1) to, show the def gree-of rotary adjustment of the deck with ref spect to the base member. Extendingthrough the hub 2| of the deck is the hollow stud or pivot 26 which is welded to the base member and has threaded ,to its upper end the securing nutj21 forholding the base member and deok in assembled relation, but at the same time'permit-i ting rotary adjustment of the deck with respect to the base member. The opening 28 through the stud 26 is topermit of the attachment tothe deck ofthe setting gauge, later described in de tail. The deck is secured in itsvariouspositions of rotary adjustment by means of the clamping plate 29 through which, extends a stud so welded at its lower end in the plate I of the base mem her. ,The upper end of the stud is threaded and carries the wing nut 3|. The end of theplamp:v ing plate extends between the guide postsll, '4 and over the graduated edge of the arc-shaped extension 24, as indicated in Fig. 2. The end of the clampingplate is provided with an indicating mark 32, preferably formed'bymaking a. Saw out in the end of the plate. This registers with the graduations 25. and indicates the degree of 5 angular adjustment of the deck with res'pectto the base member. f

Extending across the plate 2!! is avertical rib ment with the guide spaces between the posts 3, 3 andll, 4, the purpose of the slot beingto permit the movement of the hack saw downward without interference with the rib. 'In the operation of cutting strips, such as the strip A, which constitutes the work, such strips are clamped in the angle between the rib and the deck. Secured to the plate 2!! by means of bolts is, ajwoo d sheathing 36. This sheathing stops short of the flanges 22 and 23 at, each edge, as indicated in Figs. 2 and 4, and is cutout so as to form the L-shaped slots 31. The purpose of these slots isto provide for the engagement .of the'lower edges of the work clampingbars 38 shown in Fig. 2. The lower end of the bar 38 fits intothe slot 31, while its upper end 40' hooks over the upper edge of'the rib 33. Oneor more of these clamping bars may be used and they are applied by placin them at the ends of the rib as and which rests upon the sheathing 36 with" its vertislot 31, ,and then' slipping them laterally longi tudinally of the rib tothe desired position. The

. direct'cl'amping element. for the work comprises the threaded stud '4 I which extends through the a section of. sash bar of the extruded type and its inner edge is supported upon'a wood block 43,

cal side 'in engagement'withthe rib 33. A wood block such as the block 44 is placed upon the top of the strip A and is engaged by the stud II to 'give the necessary clamping action, The strip A is thus securely supported during the sawing operation without injury to, its; surface.

The strips to be; sawed maybe clamped on :either or both sides of the rib 33, and if desired,

two strips may be cut at the same time. The

. deck may be rotated about its pivot 26 so that V the saw'll will lie at any desired angle with rea spect toflthe work carriedupon the deck, the re-,

lation between "thesaw cut 32 and the graduations 25, indicating accurately the angle of adjustment. As shown in Fig; 1, thejdeviceis set so 7 asto cut at. an angle .of 30jdegrees to the center {35 i line 'B-B of the deck,

, .Figs. '1 and 3 illustrate the setting gaugewhich i is employed toadvantage in adjusting 'themit'er box to the desired angle. As appears later the setting" gauge'can be placedjin the angle. for

which the'miteri is to be cut'and, clamped in p0- sition, after which it can be applied to the] miter box and thedeckrotated until the rib133occupiesthe prope'r'position es determined bythe gauge, 'When the deck is clamped in position,-

the box is ready 'toreceive the work, .and the cut may be made. The gauge comprises a sleeve 45, in which is mounted forireeslidingmovement the pointer 46, such pointer having itsouter end 4] brought to a sharp point and its inner end #8 turned at right angles and adapted to fit snugly the perforation 28 through the pivot-26 of the deck (Fig. 4), Welded to theend of'the slceve is a bracket 49, to which are pivoted'the arms .50, 50. Slidable on the sleeve is across ,head' 5|, d the pairs of similar links 52,52

are pivoted at their inner ends to this cross head,

arid at'their outer endsto the arms,- 50, as 'showni The cross head carries a ,clamping'bolt 53 so that, whenv the cross head is brought to its a desired position, it may. be clamped in such position, thus securing the arms50, 'in'fixed,an-'

fgular relation.

In using the setting gauge, the device is placedin the. corner for which the miter is' to be cut, and the cross: head 5| is adjusted until the two arms 50,50 touch the walls constituting the boundaries of the. corner, at'which time they are fixed in position byscrewing. in the bolt 53 whichv locks the cross head in position. The

gaugeis now laid upon the deckof the miter box and the end 48 of the pointer is inserted into the perforation 28, the outer end 41 of the pointer being positioned on the deck so "that itgcomes in line withthe saw'cut l9 (Fig. 1),. 'is held in this position while the deck is rotated The gauge 'and-ad'apted-to press the workinto-the angle 7 parallel with, the rib but spacedaway' therefrom,

* hreaded through said barat an angleof about tween the deck andrib,'means at theaxis' of rotation of the deck for releasably interlocking with e setting gauge pointer, and'a setting gauge coinprising a sleeve, a'pointerslidable through the 'until the rib 33 contacts with the outer side of one of the arms 50 throughout its length, after;

which the clamping nut 3| (Fig. 2) is screwed down to. clamp the deck in its adjusted position 1 with respect to the base member. This gives the correct angle forsmitering to correspond to the angle between the arms'50, 50. For example, if this angle happenedto 'be' degreesias shown in Fig. '7) and the procedure above given were followed, the graduationindicating 30 degrees would come exactly opposite the saw cut 32 (as shown in Fig.1) when the adjustment had been i 7 completed. The gauge thus permits of the accurate adjustment of the miter box to any anglef "without the necessity of measuring such angle,

and the operation may be carried out very quickgauge into the angle which cuttingthe miter.

What I'claim is: 1

must be bisected in berprovided with 'verticalguide means for a 'saw, a unitary work supporting deck mounted on thebase for adjustment about a yertical'axis, a vertical rib extending acrossrthe ,deck rigid therewith inline with saidverticakaxis' with a slot atitscentral portion in-line with such axis and.withsaid guide'means, andmeans for clamping the work'toIbecut againstthe'deck and against said rib, and comprising a locking slot 7 ly in any casein which it is possible to thrust the, r

r ,1- In combination in a mi r b0x,.a"base memv in the deck in parallel with the rib but spaced away therefroim: an inclinedebar having hook ends, one of which lies insaid slot and the other 7 of which hookskoverthe of the rib, said, barbeing: slidable longitudinally of; the 7 slot and the rib; anda clamping stud; carried bysaid bar between thefrib and deck.

2. In combination in a miter box,base-mem 1 her provided with vertical guide means for a saw,

a unitary work supporting deck mounted, on the base 'for; adjustment about a:-vertical axis, a

vertical rib extending'across the deck rigid: therewith in line with said vertical axis, with a slot at its central portion in line with suchaxis and with p said guide means, and means for clamping the work to be cut against-the deck and against said rib, andfcomprising alockingslot in the deck in an inclined bar having. hook ends; one of which 7 lies-in said slot' and the other of which hooks over the top of the rib, said bar being slidable longitudinally of the slot and the rib, and a stud 45 degrees with respect to the rib.

I 3. In combination in a miterbox, abase nie mber provided with vertical guidemeansi'or a saw,

awork supporting deck mounted. on the base for r 7 extending across the deckin line with said vertical axis with a slot at its central portion in line with suchaxisfand with said guide means, means adjustment about a vertical'axis, a vertical-rib 0 for clamping the work to be cut-inthe angle besleeve and provided at itsinner end with means for interlocking with said means lattheaxis of 7 rotation of the deck, a'pair of arms on opposite sidesiof the sleeve pivoted at theii' inner endsto the inner end'of the sleeve,- a cross head 'slidably mounted on the sleevega' pair oflinks pivoted to s the cross head at their-inner ends andto the arms at their outer ends, and means for locking the cross head in adjusted position on the sleeve.

4. In combination in a miter box, a base member provided with vertical guide means for a saw, a work supporting deck mounted on the base for adjustment about a vertical axis, a vertical rib extending across the deck in line with said Vertical axis with a slot at its central portion in line with such axis and with said guide means, means for clamping the work to be cut in the angle between the deck and rib, a vertical recess at the axis of rotation of the deck, and a setting gauge comprising a sleeve, a pointer slidable through the sleeve and provided at its inner end with a part at right angles thereto adapted to fit into said recess, a pair of arms on opposite sides of the sleeve pivoted at their inner ends to the inner end of the sleeve, a cross head slidably mounted on the sleeve, a pair of links pivoted to the cross head at their inner ends and to the arms at their outer ends, and means for locking the cross head in adjusted position on the sleeve. 10

WILLIAM OWEN.

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