US1633409A

US1633409A - Miter box

Info

Publication number: US1633409A
Authority: US
Inventors: Edward A Hoover; William C Kirchner
Original assignee: Individual
Current assignee: Individual
Priority date: 1925-06-03
Filing date: 1925-06-03
Publication date: 1927-06-21
Anticipated expiration: 1944-06-21

Description

June E. A. HOOVER ET AL MITER BOX Filed June :5. .1925

Fatented June 21, 1927.

UNITED" STATES PATENT fori-"lenig4 -J EDWARD' A. HOOVER, or BRADLEY,

AND winniiiiviV o. KIRCHNER, or KANKAKEE ILLINOIS. i

y M'ITER Box;

Application filed Inne 3, 1925. Serial No. 34,517.

Uur invention relates generally to :miter boxes andmore particularly to compound initerboxes in which the saw guiding frame may be adjusted about a horizontal axis assame point irrespective of the angular adjustment of the saw frame, thereby permittingY accurate measurement of the material being cut. l

Further objects and advantages will be understood from the following detailed description taken in connection with the accompanying drawings in which Figure 1 is a plan view of the preferred form of our invention herein described.

F ig. 2 is a front elevation' thereof.

Fig. 3 is a section taken on .the lines 3--3 of Fig. 2, looking inl the direction of the arrows. l

F ig. l is a fragmental i'earfelevation showing the indexing and clamping means fory the saw frame. n

Fig. 5 is a section. taken on the lines 5-,5 of Fig. 1, looking .in the direction of the arrows. f

For purposes of disclosure, we have illus-v trated in the drawings and will hereinafter describe in detail the preferred embodiment of our invention, with the understanding that wev do notintend to limit our invention to the particular construction and arrangenient shown, it being contemplated that varions changes may be made by those skilled in the art without departing from the spirit and scope of the appended claims.

Referring to the accompanying drawings, our invention' in the exemplary form coinpi'ises a cast metal base 1, having raisedend portions 2 forming a divided horizontal work table adapted to support the' work, such as a board or studding to be cut. A suitable back is provided to guide the board along the work table 2 thisbackbeing herein shown as consisting' of plates 4, secured to the base by means of cap screws 5 in a posi- Vgral with the base.

tion perpendicular to the worktable 2, although the back might readily be cast inte- TheY portion '3 of the base intermediate of said end portionsis of the shape of a sector as ,shown in' Fig.1, this sector portion being provided with'a vertical pivot bolt 6 withits axis inthe 'plane of the backs 4. A scale 7 adjacent the front curvededge of the sector 3 reads indegrees both waysA from the center line 8 of lthe sector to indicate angular displacement therefrom.

A V sawframe bearing member or blockjQ,

mounted on the sector portion fof, the base in' engagement `with the pivot bolt 6 is rotat-l able thereabout through-an angle of l". The portion 10 of this block 9 'which crossesy the work table 2 is preferablyfini'shed olf in lthe horizontal planeofthe table to serve as an additional 'support for the work,thisad ditional support being thereby' provided iinniediately adjacent the cutting edge of ther saw. This block is? also pi'ovidedwith a longitudi-nal groove 11 semi-circular in crosssection which serves as a bearing trough throughout the length of the block'.y

Means Ais provided to indicate theanglea'tu.A

which the block 9 is disposed from the center line 8i and to-'secure the block in ,such

position, this means being hereinshown as comprising L-'sliaped bracket 12' attached to the forward` end of the block by' cap screws, said bracket depending K over the front edge of the sectorportion Bof the base 1.l kThis depending portion 13 fis provided with a hole `14C therethrough which is' positioned so that it may "register with any one of several tapped holes V15A in the forward edgev of the sector portion 3 of the base,-

these tapped liolesbeing located immediately below the division marks of the scale 7.

A. thumb sci'ew'l, adapted topa'ss through. the hole .14 in the bracket v12 and. enga-ge' any of thetappedholes, is provided to effectively secure the block 9 in' its adjusted position.

A U-shaped saw frame 17 is pivotally mounted in ,the bearing kblock 9, the uprights 18 and cross bar 19jof this fra-ine being bifurcated at 2() to admit a back sew (-notsliown) and thereby guide it. The cross bar19 has a cylindrical surface 21 to coact withtlie bearing trough 11 of the bearing block 9. At each end of the cross bar 19 and beyond the edges of the work table 2 llU the cross bar is of circular section for a substantial distance as at 22 and 23. Adjacent these cylindrical portions, the sides of the bearing block 9 extend upward above the plane of the work table as shown in Figs. 2, 4 and 5 to form

bearings

24 and 25 for the cross bar and thereby eectively retain the saw frame 17 in the bearing block. The

portion of the cross bar between the bearings thus formed is reduced in section as shown at 26 in Fig. 5, in order that it shall not project above the plane oi: the work table 2 when the saw frame is tilted. Thus, the saw frame 17 is pivoted for adjustment about a horizontal axis inA the plane ot the work table 2.

To secure the frame 17 in `any of its pivoted positions and to indicate the angle at which it is inclined, we provide a plate 27 secured to the bearing block 9 in a vertical position by any suitable means. This plate has an arcuate slot 28 therethrough and a scale 29 along the lower edge of the slot. A suitable index may be provided fixed to the saw frame to indicate on this Vscale the angle of inclination of the trame, such an index Vbeing lier-ein shown as comprising a depending arm 30 having a pointer 31, said arm being secured to the saw irame by means of screws 30a. This arm 30, in addition to its use as an index, comprises means to secure the saw frame in its adjusted position and against longitudinal .movement For this added purpose the arm has a hole 32 therethrough coinciding with the arcuate slot 28 to admit a suitable thumb screw 33 adapted to engage a nut 34 and thereby clamp the saw frame. rigidly.

From the foregoing vit will be apparent that we have provided an improved miter box in which the saw frame is readily adjustable about a horizontal as well asa vertical axis, and in which, irrespective of the angular adjustment and inclination of the frame, the saw will be guided to cut the intersection of the work table and back at the center line vof the table, thereby permitting accurate measurement of the material being cut.

We claim as our invention:

1. A miter box having, in combination, a base comprising raised end portions and an intermediate sector portion, said end portions forming a divided work table, a divided back, a member pivotally mounted on said sector portion for adjustment about a vertical axis in the plane of said back, means to secure said member in its adjusted position, said member having bearings aty each end thereof and a bearing trough semicircular in section throughout its length. a U-shaped saw frame pivoted in said member and adjustable about a horizontal axis in the plane of said work table, said saw frame comprising a cylindrically surfaced cross bar coacting with said bearings and trough, and a paiir of biturcatedt arms extending perpendicular thereto adapted to guide asaw across said table, said cross bar having its central Vport-ion.between said bearings reducedin section so as not to extend above the plane ot' the said table, said member having a plate member depending 'from one end thereof,A

said saw trame having a guide member de- Jendinii' therefioiii ad`acent said )late inem` ber, and means to clamp said plate member said bearings ttor adjustment about a hori-` zontal axis in the 'plane ot said table, said saw traine comprising a cross bar having cylindrical end portions coacting with said bearings and a pair ot biturcated arms extending perpendicular thereto adapted to guide a saw across said table, the portion ot said cross bar intermediate said bearings being reduced in section so as not toexteiid above the plane of the table, and means to secure said saw trame in its adjusted position and against longitudinal movement comprising a plate member depending trom'said member, a guide member secured to said saw traine and adjacent said plate member and means to secure said plate member and said guide member in fixed relation.

8. A niiter box having, in combination, a base comprising a divided work table and an intermediate sector portion in a lower plane than said table, a divided back, a member pivotally mounted on said sector portion for adjustment about a vertical axis in the plane or said back, means to secure said member in its adjusted position, said member having bearings at each end thereof and a bearing l trough therebetween, a U-sliaped saw frame pivoted in said bearings and trough for adjustmentl about a horizontal axis in the plane o't said work table, said saw frame comprising a cross bar adapted to coact'withsaid bearings and trough and a pair oit perpendicular arms biturcated to form guides for a saw, and means to secure said saw 'trame in its adjusted position.

in testimonj7 whereof we have hereunto affixed our signatures.

EDWARD A. HOOVER. r WILLIAM C. IHRCHNER.

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