US2445103A - Work holding attachment for drill presses - Google Patents

Description

July 13, 1948. J; T. BETTS I 0 WORKHOLDING ATTACHMENT FOR DRILL PRESSES I Filed 25, 1943 V 1 x m 1 /i 7' 1 M 'fifi l 6 7 I 4 i/ a I ig] Hm, I a a: s LIE." ,..'I I -I (/bb]? If INVVENTOR.

BY I

ATTDRNEYS Patented July 13, 1948 WORK HOLDING ATTAonM'ENrFom DRILL PRESSES I John :TtBetts, g Application August 23, is ispseriai No. 493,684 r "The present inventionrelates .to improvements in work holding attachments for drill presses and has for an object thereof the provision of such a device which will efiectively hold work in position for drilling.

Another object of the invention is the provision of a. work holding device which can be detachably mounted on a conventional drill press.

A further object of the invention is the provision of a drill press work holder having means for engaging work pieces having angular as well as curved contours.

Still another object of the invention is the provision of an attachment of the aforesaid character which is relatively simple and durable in construction and efficient in use.

Other objects and advantages of the invention will become apparent as the description progresses.

In the accompanying drawing forming a part of this specification and in which like numerals are employed to designate corresponding parts throughout:

Figure 1 is a side elevational view of the device in operative position on a drill press.

Figure 2 is a top plan view of the assembled device.

Figure 3 is a detail sectional view taken on the vertical plane indicated by the line 33 of Figure 2, and.

Figure 4 is a perspective view illustrating a slightly modified form of the work holder.

Referring to the drawing, wherein for the purpose of illustration is shown a preferred example of the invention, 5 generally designates the body of the device which essentially embodies an elongated rectangular plate. At its outer end the plate 5 has one corner recessed to form a right angular work engaging notch 6 preferably having its greatest dimension longitudinally of the plate as shown at Figure 2. This outer end portion of the plate is also shaped to provide a re-entrant recess 1 medially of the longitudinal edge of the notch 6 to form an inwardly tapering V-shaped work engaging notch.

The opposite end of the plate is shaped to provide medially of its side edges, an arcuate concavity 8 designed to conform to the circumferential contour of a drill press column indicated at C of Figure 1. At each side of the con-cavity 8, the inner end edge of the plate is provided with a pair of end faces 9 disposed obliquely in a direction transverse of the plate, for a purpose which will be later described.

To the inner end of the plate 5 are removably connected a pairzof .complementary pclamp 258C- tions lll each ofnwhich embodies an arcuate portion ll havingradially extending. lugs l2. and 13 at the respective ends:thereof; The-lugs 12 ,of the -.complementary sections I 0 :are -adapted,;.in assembly, to assume contiguous parallel positions and one may be formed with a smooth through bore l4 while the other is provided with an internally threaded bore l5 to receive the threaded shank of a connecting cap screw It. The lugs [3 at the opposite ends of these sections are designed for assembly with the oblique transverse races 9 of the plate and, with this in mind, each of these lugs has its outer edge I1 disposed at an acute angle with the outer face of the lug to assume alignment with the longitudinal edges of the plate when associated therewith. Furthermore each of the lugs l3 has a smooth through bore 18 adapted to assume alignment with an interiorly threaded bore IS in the plate so as to receive the threaded shank of a cap screw 20. As will be noted from Figure 2, the sections ID are formed to assume circular assembly relation with the plate to embrace the drill press column C, the said clamp sections and the plate preferably having complementary boss sections Ill projecting below the bottom face level of the body in circular arrangement to rest upon the table of the drill press.

By suitable turning of the screw I6 the column clamping end of the device may be loosened to be swung in a circle about the column C as a center to center the work beneath the drill bit D and to permit angular adjustment of the body to a non-working inoperative position or to the required operative position for holding work pieces for drilling at which time the clamp is tightened to hold the body against accidental movement. If the work piece has an angular contour as indicated at W it is arranged to fit within the right angular recess or notch 6 and is firmly held in proper position for drilling by the drill bit indicated D. If, on the other hand the work piece has a circular contour as indicated at Y it is fitted in the V-shaped notch 1. By loosening the set screw l6, and by placing a sample of the work on the table of the press and in contact with the wallsfor the recess 1, the plate 5 may be swung to center the sample with the drill bit D. The screw I6 is then tightened to secure the plate in this position, so that all subsequent samples of the same work will be automatically centered on being placed on the table in contact with the side walls of the recess 1, as suggested in Figure 2. This is also true of the notch 6. If desired the the wall of the clamp end of the work holder and the column or it may be secured to the severaparts of the clamp end of the work holde1j as 1 g I t 1; ,Number It is to be understood that the forms of my invention herewith shown and described are toteshown in the drawing.

taken as preferred examples of the same and that various changes relative to the material, size,

shape and arrangement of parts may be resorted Y to without departing from the spirit of the invention or the scope of the subjoined claim.

Having thus described my invention, I claim: In a work holder of the character described, an K elongated rectangular shaped plate;the outer end portion of the plate having an angular recess in one corner thereof and a V-shaped recess extending inwardly from a wall of said first recess, and addustable clamp means at the opposite end of the plate for attaching the same to the column of a drill press for movement in a circle with the drill press column as a. center.

JOHN T. BETTS.

REFERENCES CITED 2 The following references are of record in the ifl le of this patent:

UNITED STATES PATENTS Name Date 391,824 Taylor Oct. 30, 1888 410,803 McDaniel Sept. 10, 1889 702,217 Jacobs June 10, 1902 1,464,375 Vidinghoff Aug. 7, 1923 "1514,8512 Scharf Jan. 18, 1927 2,240,242 Cole Mar. 1'7, 1942 2 ,276,819 Boehmer Apr. 10,-1933 FOREIGN PATENTS Number 1 Country Date 574,211 Germany Apr. 10, 1933

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