US2469094A

US2469094A - Work holder fixture

Info

Publication number: US2469094A
Application number: US720969A
Authority: US
Inventors: Wicker Joseph
Original assignee: Individual
Current assignee: Individual
Priority date: 1947-01-09
Filing date: 1947-01-09
Publication date: 1949-05-03
Anticipated expiration: 1966-05-03

Description

J. WICKER WORK HOLDER FIXTURE May 3, 1949.

Filed Jan. 9, 1947 2 Sheets-Sheet 1 lHllllHn "Wi d (72% F kfSqb/L [due/ May 3, 1949. J. WICKER WORK HOLDER FIXTURE 2 Sheets-Sheet 2 Filed Jan. 9, 1947 Patented May 3, 1949 UNITED STATES PATENT OFFICE 1 Claim.

This invention relates to a work holder fixture for machine tools for holding a work piece in proper position with respect to the machine. More particularly the invention relates to a work holder for use in connection with grinding machines so as to hold the work piece in proper position with respect to the grinding wheel of a grinding machine.

Conventional machines ordinarily are adapted to edge-grind a piece of work by securing the.

Work piece on the table below the lower edge of the grinding wheel of a grinding machine for edge-grinding the work piece, but these machines are unable to accommodate relatively long pieces of work for the reason that it is impossible to insert a long piece of material between the movable table of a grinding machine and the lower edge of the grinding wheel. Long pieces of work may be edge-ground by securing the work piece to the table top and letting the work piece extend in a horizontal direction from the grinding wheel so that the material may be edge-ground from the side edge of the grinding wheel. This latter grinding operation for long pieces is undesirable in that it will interfere with adjacent machines. The present invention permits relatively long pieces of work to be edge-ground by the grinding wheel and still not interfere with adj acently positioned machines, and thereby overcomes the inherent objection to the securement of the work piece horizontally with respect to the grinding wheel. Moreover, when a work piece is edgeground by positioning the work piece horizontally, a different sort of table action and grinding wheel feeding mechanism must be employed. The present invention utilizes the conventional grinding machine, the conventional table top embodying the conventional movement of the table top as well as the conventional feed for the grinding machine, but instead of the feed being from an upward position downwardly, the grinding wheel is fed from a lower position to an upper position. This latter feeding arrangement, however, does not require any change to the conventional method of feeding the grinding wheel to and from the work in that the upper edge of the grinding wheel is used for grinding instead of the lower edge as now used for grinding smaller pieces.

The primary object of the present invention is the provision of a new and novel fixture for a machine tool, such as a grinding machine,

whereby the bottom edge of a relatively long work piece may be edge-ground by engaging the upper edge of the grinding wheel with the lower edge of the piece of work to be ground, whereby as the table moves laterally in a rectilinear path and is fed inwardly, the bottom surface of the work piece may be ground.

Another important object of the invention is the provision of a novel work piece holder of simple construction, which is preferably cast integrally from metal, so that the base of the fixture may be mounted on top of the movable table of a grinding machine and secured to the top when the top is magnetized, the fixture having a face plate against which the work piece may be secured in vertical position, such as by clamping the work piece to the face plate.

Numerous other objects and advantages will be apparent throughout the progress of the specification which follows.

The accompanying drawings illustrate a selected embodiment of the invention, and the views therein are as follows:

Fig. 1 is a detail elevational view of a conventional type of grinding machine, to which the work holder fixture embodying the invention is applied, and shows the manner in which the relatively long work piece may have its bottom edge edge-ground;

Fig. 2 is a view at right angles to Fig. 1 and shows the work piece clamped to the face plate of the fixture by means of a conventional C- clamp;

Fig. 3 is a detail perspective view of the improved work holder fixture;

Fig. 4 is a detail perspective view of an edge gauge adapted to be removably mounted to either edge of the face plate to position the work piece to be ground; and

Fig. 5 is a detail sectional view on the line 5-5 of Fig. 2 showing a piece of work clamped against the face plate of the work holder fixture.

The work holder fixture l is adapted to be mounted on the top surface 2 of a magnetized plate mounted on the table 3 of a grinding machine d. The grinding machine 4 may be any conventional type of grinding machine which ordinarily embodies a table top 2 adapted to be moved laterally in a rectilinear path (to the left and right Fig. 1). The table 3 is adapted to be fed inwardly and outwardly toward and from the grinding wheel 5, Figs. 1 and 2. The plate 2 is preferably made of metal and is adapted to be magnetized by the energization of an electromagnet whereby a piece of work may be secured rigidly to the upper surface of the member 2. The conventional grinding machine, herein shown, is of the type whereby the work piece may be secured to the top 2 when the top 2 is magnetized so that the work piece is secured in position. The work piece is then adapted to be edge-ground by the bottom of the wheel during the movement of the table in a rectilinear path and by the feeding movement of the table toward the grinding wheel. The space between the lower edge of the grinding wheel and the top 2 of the table is relatively small so that large pieces of material cannot be edge-ground. The grinding wheel 5 is mounted on a spindle 6 and is rotated by an electric motor (not shown),

- of the shiftable table 3.

The spindle 6 is mounted in a suitable bearing I which is adapted to be moved vertically upon operation of the hand wheel 8 whereby the grinding wheel may be moved upwardly and downwardly within certain limits.

The fixture I of the present invention is adapted to be mounted on a conventional ma-, chine of the type just described, but is adapted to support a work piece 9 in vertical position and have its lower end edge-ground by the upper edge of the grinding wheel 5. The work hold er fixture I comprises a base I9 having its front edge II formed as a straight-edge so that it may be placed against the back gauge I2 which is mounted on the upper surface of the work table so as to position properly the fixture i with respect'to the work table. The base It is relatively square, and carries a vertically extending standard or support I3 which is preferably formed integral with the base. A face plate I4 isarranged at the upper end of the standard- I3 .andtis preferabl formed integral with the standard. The front face of the face plate I4 is offsetfrom the straight edge II of the .base, but is in a vertical plane parallel to the Vertical plane of the straight edge I I.

An edge guide I5 is provided with a pair of spaced holes I6 which are adapted to align with complementary spaced holes I 1, I I formed in the opposite side edges of the face plate I4. The holes I1 on each edge of the face plate are adapted to be threaded and to receive fastening members I8, I8 which pass through the holes I6 and threadedly engage the holes I1 in either side of the face plate. The edge gauge I5 is perpendicular to the front face of the face plate I4 so that when the work piece 9 is secured to the face plate it may be gauged by the gauge member I5 to position properly the work with respect to the face plate and with respect to the grinding wheel. The work piece is adapted to be secured to the face plate I4 in any conventional manner such as by clamping the work piece to the fixture .by use of a conventional C- cl'amp I9.

The fixture I is adapted to have the bottom of the base It] mounted on top of the plate 2 The top 2 is preferably of the type which may be magnetized so that when the magnet is energized the work holder fixture will be secured tightly to the top 2, the fixture of course being centered with respect to the grinding wheel, and the straight edge I I being in contacting engagement with the machine back gauge I2. The work piece is adapted to rest against the gauge I5 and to be clamped tightly against the front face of the face plate I4, whereby the work piece may extend upwardly so that the lower edge of the workpiece may be edge-ground by the grinding wheel 5/ The fixture I is of such a size that the space from the bottom of the base to the lower edge of the face plate will be above the upper edge of the grinding wheel so that the upper edge of the grinding wheel may be used to edge-grind the lowermost surface of the work piece 9 which extends upwardly and vertically from the faceplate. The rectilinear movement of the table, as well as the feeding of the table, will there- :by cause the grinding'wheel to grind the complete lower surface of the work piece 9.

The use of the fixture of the present invention thereby accommodates conventional machines for edge-grinding relatively long pieces of work because the work is arranged in a vertical position, utilizing the upper edge of the wheel instead of the conventional practice of using the lower edge of the wheel. The lower edge of the wheel of course cannot be employed for relatively long pieces of material because the vertical shiftable movement of the grinding wheel is limited so that in many instances the space between the bottom edge of the wheel and the top edge of the table is insufiicient. The use of the fixture, therefore, adapts conventional machines to edgegrinding long pieces of work by spacing the edge to be ground a sufficient distance from the table top so that the upper edge of the wheel may be used. The length of the material to be ground, therefore, is only determined by the ceiling height and there is no interference with adjacent machines.

The device is rugged and durable in construction, is adapted-to be applied to various types of grinding machines and may be readily and economically manufactured.

Changes may be made in the form, construction andarrangement of the parts without departing from the spirit of the invention or sacrificing any'of its advantages, and the right is hereby reserved to make all such changes as fall fairly within the scope of the following claim.

The invention is hereby claimed as follows:

A work holder adapted for use with a machine tool having a bed plate, a working element and a gauging shoulder, said holder comprising a substantially rectangularly shaped base member forming a fiat downwardly facing support surrace, adapted to rest upon the bed plate of the machine tool with the forward edge of the base portion bearing against the gauging shoulder thereof, an upwardly extending relatively thin standard portion disposed centrally between the ends of said base and extending parallel thereto, the bottom of the rear upwardly extending edge of said standard lying in the same plane as the rear edge of the base and sloping inwardly thereof, the front upwardly extending edge of said standard being spaced rearwardly from the forward edge of said base, a face plate portion at the upper end of said standard spaced upwardly from the base and positioned at right angles thereto, said face plate also being offset rearwardly of the forward edge of the base engaging the gauging shoulder and an end gauge element removably mounted on an end of said .face plate, whereby the forward edge of the base may abut against the gauging shoulder on the machine and the work may abut against said end gauge element on the face plate for positioning properly with respect to the working element on said machine too.

JOSEPH WICKER.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 81,608 Curtiss Sept. '1, 1868 1,265,818 Schmidt May 14, 1918 1,515,039 Hanson Nov. 11, 1924 1,548,086 Heald et a1. Aug. 4, 1925 1,600,144 Schmidt et a1 Sept. 14, 1926 1,663,320 Stoddard et al Mar. 20,1928 1,863,538 De Smet June M, 1932 2,390,978 Woodbury Dec. 11, 1945 2,418,059 Varcoe Mar. '25, 1947