US255302A - Bevel saw-table gage - Google Patents

Description

(N0 Modelf) B. G. LUTHER.

' 13E-VEL SAW TABLE GAG-E. I No. 255,302. Patented Maml 21,1882.

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'NITEDI STATES PATENT OEEICE.

BENJAMIN G. LUTHER, OF HEBRONVILLE, MASSACHUSETTS, ASSIGNOR TO.-

FRANK V. SAWYER, OF PROVIDENCE, RHODE ISLAND, AND CHARLES A. SAVVYER, OF MALDEN, MASSACHUSETTS.

BEVEL SAW-TABLE GAG E.

SFECIFICATION forming partA of Letters Patent No. 255,302, dated March 21, 1882, Application filed November 103881. (No model.)

To all whom it may concern:

Be it known that I, BENJAMIN G. LUTHER, of Hebronville, in the county of Bristol and State of Massachusetts, haveinvented an Im-Y xo ment of parts, as hereinafter fully set forth and claimed, whereby the gage may be rendered useful for a great variety of work.

Figure l is a plan view of my improved gage attached to the table of a circular saw. Fig. 2 is an elevation of the same. Fig. 3 is aseotion taken in the line x x of Fig. l. Fig. 4 is a section taken in the line fr x of Fig. l, enlarged, showing the pivot-clamp. Fig. 5 represents a section taken in the line y y ofV Fig. zo 1. Fig. 6 represents a section taken in the line z z of Fig. l, with the clamp-pin turned in the same line. Fig. 7 represents a plan View of an ordinary parallel gage, combined with the grooved bed-plate of the bevel-gage.

In the drawings, Arepresents the saw-table 5 B, the circular saw; C, a metallic bed-piece let-into the table A, and provided with the parallel grooves c c.

Upon the bed-piece C is placed the sliding 3o piece D, provided with a slide, cl, which enters one of the grooves c, by means of which the sides of the plate D are retained in uniform relation to the plane of the saw B. The plate D is provided with a hub, E, upon which is pivoted the plate F, provided with a semicircular slot, f, to receive the thumb-screw e, which serves to fasten the plate F rigidly to the plate D in any required position with relation to the saw B.

Upon the upper end of the hub E is rigidly secured the pointer a., and the are b upon the pivoted plate F is graduated to indicate a specie movement of the plate F vupon the plate i D. A pointer, g, is also Xed to the plate F,

f and the forward edge of the plate D is graduated to degrees, to indicate the enact movement of the plate F upon the plate D. The racks Gr Gv slide in grooves h h atopposite sides of the plate F, being secured therein by the caps t'. t. The'racks are operated back and 5o forth by means of gears J J, attached to a shaft, K, likewise held by the caps i t', and operated by means of the knurled wheel j. To the outer ends of the parallel racks G G is attached the guide-plate H, centrally pivoted to the ends of the racks at-the points k k.

To one end of the plate H is secured the graduated are I, which maybe clamped in any desired position by means of the clampingscrew l, which enters a boss upon the side of 6o the adjoining rack G. A pointer, L, is secured to the side or" the rack, and serves to indicate upon the graduated arc I the exact angular movement of the guide-plate H. A supporting-foot, M, depends from the lower side of each of the racks G G. The guide-plate H is capable of movement ina vertical plane, as shown by the dotted lines in Fig. 3, and the combined plates F and H are capable of movement in a horizontal direction upon the pivot 7o E, as shown by the, dotted lines in Fig. 1. The face of the guide-plate H may be thusinelined vertically and horizontally with the plane of the revolving sawl B, and is therefore adapted to a great variety of work. The clamp-pin N, provided upon one side of its lower'end with the hook n and at theupper end with the pivoted cam O, serves to clamp the plate D to the hed-piece C, a groove7 fm, being out in the wooden table A to receive the hook u. The 8o cam O is made with 4unequal sides r r', in order to serve as a clamp, irst, to the bed-piece C, as shown in Fig. 4, whereby the combination-gage will b e retained in a fixed position with relation to the table, and, second, to the plate D, whereby the combination-gage will be made movable over the saw-table inthe direction of the grooves c, a recess,s, being'made in the under side of the plateD to receive the hook n, as shown in Fig. 6, so that the lower 9o side of the hook may be raised entir'ely above the surface of the table.

The bed-piece C is provided with screwholes t t, which serve as means for the attach-y mentotthe ordinary parallel gage, P, as shown in Fig. 7, when the combination bevel-gage,

as above described, has been removed from the saw-table.

When the several parts of the bevel-gage are clamped to the table by means of the clamp N O the guide-plate H may be adjusted with respect to its distance from the side of the saw B by turning the. wheel j, thus moving the racks G G in and out, as desired, and when the proper position has been reached the' plate H may be retained in its position by turning,r the clamping-screw o, thus securing the rack G.

The guide-plate H may be set at any desired vertical angle within the limit of its movement by means of the arc l and clampingscrew l, and may likewise be adjusted at any desired horizontal angle by means of the slot fand thumb-screw c. The gage may also be changed from one of the grooves c to the other,aceording as the space required between the guide-plate and saw may be greater 0r less.

I am aware thatin PalentNo. 172,279, dated January 1S, 1S76,a saw-gage is shown similar to that herein described; but in my combination a double rack and pinion movement is substituted for the screw for moving theguideplate, thus controlling the position ofthe ends oi' the guide-plate in a more positive manner,

avoiding backlash or looseuess, and admit-v ting of' more rapid adjustment.

I claim as my invention- 1. Ina bevel-gage for circular saws, thecombination ot' the bcdpiece C, provided with a groove, c, sliding plate D, pivoted plate F, gears J J, secured to the shaft K, racks G G, and pivoted guide-plate H, substantially as and for the purpose set forth.

2. In a bevel-gage for circular saws, the combination of the grooved bed-plate C, sliding plate D, and pivoted plate F, with the clamppin N, provided with the hook u, and cam O, having unequal sides r r', whereby the sliding plate D and pivotetl plate F maybe eitherimmovably secured to the bed-plate C or secured to each other in sliding connection with the bed-plate C, substantially as described.

BENJAMIN G. LUTHER.

Witnesses:

HARMON S. BABcoeK, SoCRA'rEs SCHOLMELD.

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