US1517706A - Miter box - Google Patents

Description

6. w. CARY MITER BOX Filed Jan. 27, 1923 "/4 MBER V INVEN TOR.

ATTORNEY.

Patented Dec. 2, 1924.

lhlihfillt FlE.

GEORGE W. GARY, OF GREENFIELD, MASSACHUSETTS, ASSIGNOR TO GOODE-LL MANU- FAOTURING- COMPANY, OF GREENFIELD, .TIIASSAGHUSETTS, A CORPQRATION OF MASSACHUSETTS.

MITER BOX.

To all "whom it may concern:

Be it known that I, Gnonon W. CARY, a citizen of the United States of America, and a resident of Greenfield, in the county of Franklin and State of Massachusetts, have invented certain Improvements in llliter Boxes, of which the following is a specification.

My invention relates to improvements in miter boxes, and more particularly to certain attachments therefor, and consists of an angle attachment adapted to be secured to the bed of a miter box at one end, a length-gauge attachment adapted to be secured to said bed at the other end, and a square scale delineated on or attached to the front side of the arcuate member of said bed in front, such parts and members being of new and novel construction and forming new and novel combinations, all as hereinafter set forth.

One object of my invention is to provide a miter boX with comparatively simple and inexpensive, yet strong and durable, and convenient attachments or devices, whcrewith may be obtained adjustments for angles more acute than 45, on the one hand, and is facilitated the cutting of duplicate parts of any length within the range of adj ust-ment of the length gauge, on the other hand. The angle attachment may also serve as a molding holder, and used in conncctlon with the length gauge.

It is ordinary practice for a carpenter to determine angles for cutting rafters or finish with a carpentei s steel square, and another object of my invention is to provide a miter box with means whereby rafters or finish can be cut at the desired angle without the aid of a square, or recourse to the degree scale of the miter box.

Other objects? and advantages will appear in the course of the following description.

. ll attain the objects and secure the advantages of my invention by the means illustrated in the accompanying drawings, in which Figure 1 is a top plan of the principal parts of a miter box with which my attachments in preferred form are combined; Fig. 2, a front elevation of the square scale showing the same straightened out; Fig. 3, an enlarged, rear end elevation, with parts broken out, ofthe angle attachment; Fig.

Serial No. 615,199.

4, an enlarged, front end and elevation of the length-gauge attachment, and Fig. 5, a right-hand side elevation, in partial section, of said last-named attachment.

Similar reference characters designate similar parts throughout the several views.

In the first view I have shown the prin cipal parts of a miter box, substantially like that covered by Letters Patent of the United States, No. 978,576, and will first briefly describe the same- A bed comprising a frame 1 and plates 2-2 and provided with legs or feet 3, there being the usual open quadrant 4 between adjacentedges of said plates, vertical back members 5-5 spaced apart to leave a vertical opening for the saw, a radius bar 6 pivotally connected at 7 with said frame, and extend ing beneath said frame and beyond the front and back sides thereof, a channel bar 8 supported from said radius bar in the opening (4), and vertical saw guides or posts 9-9 rising from said radius bar adjacent to opposite ends thereof. Means (not shown) are provided for locking the radius bar 6 at any desired angle relative to the frame, whereby a board or other piece of stock may be sawed at a right-angle or at an acute or obtuse angle to its length, the saw (not shown) being operated through vertical slots in the posts 9 and the aforesaid space or opening between adjacent ends of the back members 5, and finally coming down into the channel in the bar 8, all in the usual and well-known manner. The sides of the opening 4, which latter is bounded by the adjacent ends of the plates 2, form a right-angle, and the front of said opening is bounded by an arcuate part 10 of the frame 1, and a degree scale 11 is provided on said arcuate part, such scale being common to miter boxes. The scale 11 is provided to enable the radius bar 6 to be set at any angle within the available quad rant of adjustment.

Secured by means of two bolts 12 to each end of the frame 1 is a support and guide in the form of a bar 13. The bars 13 are alike and interchangeable. In the top of each bar 13 extending longitudinally thereof is an angular slot, channel, or groove 14. Along one side of the groove 14 is an overhang 15. Thus it is seen that the groove 14 in cross section has two wide sides below and one narrow side above. The angles formed by the aforesaid. wide and narrow sides are right-angles, and in reality constitute three angles of a square. ne of the wide sides of the groove 1-1 forms an acute angle with the side of the bar 13 which is contiguous with the frame 1, and the narrow side of said groove forms an acute angle with the top of said bar. The bolts 12 pass through lateral openings 16-16 in each bar 13 and are tapped into the frame 1. An opening 17 is tapped into each bar from the outer face thereof and extends beneath. the groove let in said bar. The opening 17 is located midway between the ends of the bar 13. A bl'ltlIIlb-SCTGW 18 is provided to fit the opening 17 in each bar A slide 19 is provided to lit the groove 1 1, such slide being square in cross section, except adjacent to its rear terminal where said bar is flattened, and a post 20 is mounted on such flattened part.

A clamp 21 is mounted on each thumbscrew 18, and such clamp in each case consists of an approximately vertical plate having an inwardly-extending lip 22 at the bottom, to engage the under side of the associated bar 13, and an inwardly and upwardly-extending lip 23 to engage the inclined side of the slide 19, or of a similar slide 24, which side extends upwardly and inwardly from the outer longitudinal edge of the horizontal, central plane of such slide. Thus it is seen that, when either thumb-screw 18 is tightened, the clamp 21 mounted thereon is forced inwardly toward and against the contiguous bar 13, and into wedging engagement with the slide 19 (or 24) carried by said bar, thereby causing said slide to engage frictionally said bar with sufficient force to hold the former against longitudinal movement. Upon loosening the thumb screw 18 the slide 19 (or 24) can. be moved freely lengthwise in either direction.

The groove 14. is located off center longitudinally in each bar 13, consequently the slide 19 (or 21) extends beyond the bar 13 on the side of the latter where the associated clamp 21 is located, with the result that, when said clamp is forced inwardly by its thumb-screw 18, said clamp forces the slide downwardly and inwardly, thus securing a binding effect on all four sides of the slide.

The slide 241 is provided atthe rear terminal with a block 25 in which there is a transverse slot 26 to receive a horizontal length gauge 27.' The length gauge 2'? is merely a bar which is rectan ular in cross section, and has its inner terminal bent forwardly at right-angles to the main portion of said bar. The thickness of the gauge 27 is slightly greater than the depth of the slot 26, which causes the top of said gauge to be located above the top of the block 25. Tapped into the block 25, behind the gauge 27 and cxtemling downwardly into the slide 24, is a screw 28 which is in'ovided with a handle 29. Inter-posed l')6t\\(3ll the head of the screw 28 and the top of the. block is a washer 39, such washer having a sulliciently large diameter to enable the same to bear on the gauge 27. Upon tightening the screw 29 the washer 30 is caused forcibly to engage the gauge 27 and to hold the same against longitudinal movement. Upon loosening the screw the gauge 27 can be adjusted longitudinally to whatever extent required.

The slide 2 1. like the slide is square in cross section. fits the groove 14- in either bar 18, and is adjusted and secured therein after adjustment by means of the associated thumb-screw 18 and clamp 21. in a similar manner to that in which said slide 19 is adjusted and secured as hcreinl'icfore explained.

If it be desired to make a cut at an an le that is too acute to be available with the miter box proper, the slide 19 is adjusted to whatever extent may be necessary to locate the post 20 in position to compensate for the difference between the normally available 45 angle and the desired angle. and then the stock to be cut is pla ed on the plates 2 against the outer end of the righthand baclr member 5 and the front side of the post 20, and held in such position while being cut. the saw-guide member havingbeen previously adjusted or moved into the reouired position.

The process of cuttine moldings or the like mav frequentl be fmilitated bv usinn the angle gauge. To this end the slide 19 is adjusted in such a manner as to locate the post 20 in advance of the vertical plane of the front or face of the back members 5 a distance equal to the major lateral dimension of the stock. Then the stock is placed on the plates 2 against the back members 5 and behind the post 20 and cut. said post assisting; materially in holding said steel: in lace during the cutting operation.

The length range 27 is em loyed for cutting duplicate parts. and said gau e is a l justed to locate the inner terminal o the same in proper position for fixing or dete minino. the length of the stoclt to be cut. bv movin said gauge longitudinally in the block The gau e 27 is properly located relative to the thicl ncss or width of the stock to be cut by adjusting the slide 24- n its bar 13. The stock is placed on the plates 2 against the hack members 5 and moved into contact with the bent. terminal of the gauge 27. and there held while being cut. The angle gauge post 20 may freouentlv be emnlo ed to advantage in connection with the length canoe. to assist in ho ding the stock in place while being cut The slides 19 and 24:, with the parts and members supported and carried thereby, can be removed at any time from the bars 13 and laid one side out of the way, and said slides can be as readily returned to place in said bars. Thus it is not necessary to be to the trouble of removing the supports 13, or either of them, whenever it is desired to lay aside the angle gauge attachment and the length gauge attachment, or either of them. With these attachments I am able to obtain with practically no difficulty the most minute adjustments, and there is provision therein for obtaining such adjustments easily, quickly, and conveniently, while at the same time the locking elements are safe and secure.

A scale 31 is secured to the front side of the arcuate part 10 of the frame 1, and this scale is so graduated and marked, from zero in the center to twelve at each end, that the same can be used in place of the scale 11 as a means of determining the location of the saw-guide members, when it is desired to out such stool: as roof rafters which ordinarily have to be laid out with the aid of a carpenters steel square. In using the steel square it is necessary to indicate on the rafters two points, from the arms of said square, as 12 and 6 for example, and then to connect the points with a line to serve as a guide for the saw; while with the scale 31 it is simply necessary to set the saw-guide members on the numeral which determines the angle of the cut required, and proceed to place the rafter in position and cut through the same. The numerals 1 to 12, inclusive, denote or indicate what are technically termed one out, two out, three out, etc. When the saw-guide members are set on O on the scale 31 the saw cuts at an angle of and when said members are set on either 12 on said scale the saw cuts the stock at an angle of 15. This last is termed a twelve cut. The other numerals on the square scale correspond with rafter angles between 15 and 90.

More or less change in the shape, size, construction, and arrangement, of some or all of the parts of this invention, may be made without departing from the spirit of the same, or exceeding the scope of what is claimed.

What I claim as my invention, and desire to secure by Letters Patent, is

1. The combination, in an attachment for a miter box, with a bar attachable to a miterbox bed, said bar having a longitudinal groove therein which opens through one side and is partially formed by an undercut adjacent to the other side thereof, said groove in cross-section having an angle in the bottom and an angle formed in part by the undercut portion, of a slide angular in cross section to fit said groove with one angular part of said slide in the bottom of said groove, another angular part beneath said undercut portion, and another angular part extending beyond said bar, said slide being provided with a work-engaging member, a screw-threaded member tapped into said bar, and a clamp mounted on said member and having a lip which extends beneath said bar and a lip which extends into engagement with said last named angular part of said slide.

2. The combination, in an attachment for a miter box, with a bar attachable to a miterbox bed, said bar having a longitudinal groove therein which opens through one side and is partially formed by an undercut adjacent to the other side thereof, said groove in cross-section having an angle in the bottom and an angle formed in part by the undercut portion, of a slide angular in cross section to fit said groove with one angular part of said slide in the bottom of said groove, another angular part beneath said undercut portion, and another angular part extending beyond said bar, a longitudinallymovable length gauge carried by said slide, means also carried by said slide to clamp said gauge and hold the same against longitudinal movement, a screw-threaded member tapped into said bar, and a clamp mounted on said member and having a lip which extends beneath said bar and a lip which extends into engagement with said last named angular part of said slide.

3. The combination, in a miter box, with a bed, and grooved bars adapted to be at tached outside to the ends of said bed, of slides receivable in the grooves in said bars, movable means to clamp said slides to said bars, a post carried by one of said slides, and length-gauge clamping means carried by the other of said slides, said slides being adapted to be lifted out of said grooves and interchanged, when said clamping means is removed.

GEORGE W. CARY. Witnesses:

PERLEY E. FAY, VIN'roN C. GARDNER.

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