US2411641A - Work table with sine bar adjustment - Google Patents

Description

' NOV. 26; 194-6. SEALEY WORK TABLE WITH SINE BAR ADJUSTMENT Filed Feb; 4, 1944 5 Sheets-Sheet 1 IN vaum KL Lame EDwuv may.

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Nov. 26, 1946. J E. SEALEIY 2,411,641

WORK TABLE WITH SINE BAR ADJUSTMENT Filed Feb. 4, 1944 3 Sheets-Sheet 2 INvENfYoR- nwm EALEY b9 i Y ATTOKNfifS.

1 Nov. 26, 1946. E, SEAL Y 2,411,641

WORK 'TABLE WITH $11111 BAR. ADJUSTMENT Filed Feb. 4. 1944 3 Sheets-Sheet 3 INVENTQR LOuns E. DWIN 5EALEY.

Patented Nov. 26, v1946 WORK TABLE WITH -SINE BAR ADJUSTMENT- I Louis Edwin Sealev, Carsham, England, assignor to Papworth Limited, Bristol, England, a

British' company v ineeen February 4, 1944, Serial No. 521,157 Y 7 In Great Britain November 10, 194.],

can be obtained by other devicesused for similar purposes. For these purposes'I utilize a known arrangement, of the kind in which a'circular work table rotatable about its own centre is also mounted to swing in a vertical plane,that is, its axis of rotation can be tilted about a shaft r'bearing member in a pillar on the base of the device.

According to the present invention, the shaft itself is pivotally connected with the pillar, ena lin a third adjus m nt o be e iected to duce .a compound. angle of tilting of the table. The extent of adjustment in any plane is regulated by a sine bar, and locking means are provided to secure the't ble .firm y in e positions to which'it has thus been adjusted.

Inorder that the said invention may'beclearly understood and readily carried; into efiect, the

same will now be described more fully with reference to the drawings accompanying which'illustrate an exemplification of the invention.

Figure 1 representsthe apparatus in si'deelevation, with the work table in zero or horizontal position. 7

Figure 2 is a view corresponding with that in Figure 1, but with the table swung through: an angle of 90 degrees into a vertical position;

Figure '3 is a plan of the table, partly broken away to enable the locking mechanism of the table to be seen. j s

Figure 4 is an elevation viewedat right angles tothat in Figure 1. p H I I Figure 5 is an elevation corresponding with that in Figure 4, with the table swung to the left 90 degrees into a vertical position.

Figure 6 is a 'view similar to that in 5, 7

but with the table degrees. I I

Figure '7 isa viewsimilar to Figure '1, with some parts omitted, toshow the sine bar in one of its zero positions.

Figure 8' is a View similar to Figure 2 showing the sine bar with slip gauges between its disc d and the setting pad h swung to the rightthrough Figure 9. is a plan; and Figures 10, 11, and 12,.

elevations similar to Figures 4, 5, and 6 respectively, showing the sine bar in position in each case.

In the drawings e indicates a bed or base plate, on which is a pillar 5| to which a shaft c is rotation about; the said shaft 0. The end ofthe shaft remote from its pivot pin d is supported by a bearing head 9, and the head 9 is intuirn supportedby two pairs of links u and v, thelinks u being pivotally connected at a: with the ba'seIe, and the links 0 pivotally connected with the "head g atw. An arm a pivoted at b to the base ,6: passes through a block J at which the links u and 1) meet, and as the lower half of this block is split, and a pin 2 c jnnecting the two pairs of links passes through the saidlo'wer half, when th P ened he bloc a d. l n s a'r therebysecured in adjusted position, I, as seen clearly in Figure '2. f

On the base 6 are stops or abutments f,,z l, n, and o-andstopsia', 1' 'and' depend o he bearing a. f A sine bar I having at one end a disc dhcan be attached at either side of pin 01, at 9: or 1 (Figure 9) and at the end of the ex tension shaft c at 2 which shaft is concentric with a tlqj ut' is 'fix d o and moves w t table support it. Asseen' in Figure 4, a slip II; can be inserted between the stops 2' and 1' to sup.-

port the table in a position parallel withthe' base, although the Itable is free to swivel'about the shaft 0. The periphery of the table I) is graduated as seen in Figure l, and in the table top are' four T slots 54 ,(see Figure 3) in square formation, for the attachment of the work-piece to the table.v In the zero position; that is with 0 on the table graduations' opposite ,0 on a graduated plate 5 on the bearing a, two of these slots are exactly parallel with the centre line of the hinged shaft 0, and the .other two slots ex.- actly at right angles thereto. A tapered spigot r is permanently secured to the table 11, and can be gripped'by a taper bored band 1 con,- trolled by a screw p. By turning the screw 1b in an anti-clockwise direction the band q is allowed to release its hold on the spigot T, when thetable can be rotated about its ce t e ntil h an A earin a carrying t e position to which it has been swung around the shaft 0, the bearing support a is split, and two screws t passed through the bifurcated lower portion. thereof, each of the said screws having square portions at each end, so that the screws can be tightened or slackened from either side which may be easily accessible when the table has been tilted about the shaft 0, for instance as in Figure 5 or Figure 6.

Assuming for example that a tilting angle'of 10 degrees is required in the plane of swinging about the hinge pin d, and an angle of 2 2' degrees in the plane of swinging about the-axis of the shaft 0, it is necessary in the first place to ascertain that the stops g and 1 meet (see Figure 1) then a slip h 2.25 inches long is inserted between the stops 12 and ;i (Figure 4) thus bringing the table into a true horizontal plane with the base es; the table is pushed firmly toward the base and locked relatively to the shaft by means of the two screws t and the screw 2 passing through the clamping block y, the sine bar I fixed on the end of the shaft c (Figure 9) and a 1 inch slip g placed between the abutment c on the base and the disc 11 on the sine bar (Figure 10), the nut e tightened on the extension of shaft 0 concentric with shaft 0 so as to clamp the sine bar I, at the same time applying a light pressure on the disc 01 to make contact with the slip g The constant for 22 degrees is then selected from the sine bar table (5") which is 1.873, and a combination of slips to make up this figure is then required. The two screws t (Figure 2) are then'slackened and the table tilted, bringing the sine bar f away from the l slip gauge g until the stops it and I meet. The slips making up the combination are now placed on top of the 1 inch slip g or alternatively the 1 inch slip can be removed and 1 inch added to make the combination 2.873. The table is then swung lightly back until the disc d of the sine bar makes contact with the top of the slips, the two screws t locked, and the nut 6 sine bar and slips removed. Next, to obtain the angle of 10 degrees in the plane swivelling about the pin 12, the sine bar is attached to the pin d in the position marked y in Figure 9, again placing a 1 inch slip between the disc 01 of the sine bar and the abutment h on the base 2 and the locking operation is repeated. The sine bar is then in a true parallel plane with the base 6. The constant for 10 degrees is given as .8682, so that if the screw .2 is slackened and the table pushed back until the hinge pin projection 51' meets the stop pin 0 (Figure 2) slips can be placed on topof the 1 inch slip to give 1.8682, then the table brought down until the disc d touches the top of the slips, the screw 2 is locked, and the sine bar, nut e and slips removed. The table is now ready for use with a compound angle the components of which are 10 degrees and 22 degrees res ec= tively.

What I claim as my invention and desire to secure by Letters Patent of the United States is:

1. In a work table, a base, a pillar rising from said base, ashaft pivotally mounted on said pillar to swing in a vertical plane, a bearing to carry va work table, said bearing comprising dependent members rockable on said shaft in a vertical plane at right angles with the aforesaid vertical plane,

said work table being rotatable on said bearing to obtain a compound adjustment of said work table, an arm pivoted on said base carrying a bifurcated block, said block being movable longitudinally of said arm, links pivoted to said base and to said bearing respectively and having their joint meeting at said block, a pin connecting said links and passing through the split part of said block to tighten the latter to maintain the said links and bearing in the position to which they have been adjusted. v

2. In a work table, a base, a pillar rising from said base, a shaft pivotally mounted on said pillar to swing in a vertical plane, a bearing mounted on said shaft to swing in a plane at right angles with said vertical plane, a table carried on and rockable integrally with said bearing in a vertical plane and rotatable thereon to obtain a compound adjustment of said work table, locking means rovided to maintain said adjustment, and stops arranged to permit location of the work table positively in horizontal and vertical positions.

3. In a work table, a base, a pillar rising from said base, a shaft pivotally mounted on said pillar to swing in a vertical plane, a bearing mounted on said shaft to swing in a plane at right angles with said vertical plane, a table carried on and rockable integrally with said bearing in a vertical plane and rotatable thereon to obtain a compound adjustment of said work table,

locking means provided to maintain said adjustment, stops arranged to permit location of the work table positively in horizontal and vertical positions, and further stops permitting location of the work table in a plane inclined at to the horizontal in a'movement of adjustment about said shaft.

4. In a work table, a base, a pillar rising from said base, a pivot pin carried in the pillar, a shaft upon the pivot pin and disposed perpendicularly thereto for swinging in a vertical plane, a bearing to carry a Work table, said bearing comprising dependent members rockable on said shaft in a vertical plane at right angles with the aforesaid vertical plane, said work table being rotatable on said bearing to obtain a compound adjustment of said work table, a sine bar, means upon the pivot pin of said shaft and the shaft itself for removable attachment of said sine bar to permit the latter to co-operate with interchangeable slip pieces and thus to regulate the adjustment of the pivot pin and shaft relatively to the base, and locking means to maintain the said adjustment.

LOUIS EDWIN SEALEY.

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