US 3423885 A
Description (OCR text may contain errors)
Jan 1969 H. D. C'ZRANDALL 3,423,885
SINE v-BLocK Filed March 16, 1966 Fig.6
PRIOR ART Herbert 0; Cra'ndall INVENTOR.
Jan. 28, 1969 H. D. CRANDALL SINE V-BLOCK 2 n m n m 0 GE r r W e H United States Patent 2 Claims Int. Cl. B24b 41/06, 19/00; B23q 3/00 ABSTRACT OF THE DISCLOSURE A workpiece holder in the form of a sine V-block for use during the machine operation with, the block having precision surfaces thereon and a recess in each vertical corner and the bottom end corners thereof. Each recess includes a cylindrical sine which has a precision peripheral surface to enable gauging blocks to be disposed be tween the sine and a precision supporting table surface. The block has a V-shaped notch in the top surface thereof with a groove in the bottom of the notch to facilitate cleaning and means associated with the notch for holding the workpiece therein.
The present invention generally relates to a device for holding and supporting work in a desired position while some type of machine operation is conducted on the work and more particularly relates to a sine V-block clamping device especially constructed but not limited to use in grinding bushings and punches for dies, fixtures and the like.
An object of the present invention is to provide a sine V-block constructed from hardened and ground tool steel or equivalent material which is provided with a sine on both ends and both sides thus allowing the person using the block to grind or machine the draft, relief or angle on the work on a single set-up and also enabling both ends of the work to be completed without changing the set-up so that the operator can merely reverse the procedure on one side of the bushing or work to complete the other side of the work inasmuch as the block has a sine on both ends and both sides.
Another object of the present invention is to provide a sine V-block which replaces the use of rather complex compound angles which enables the operator to fix and complete his work in a much shorter length of time inasmuch as only one set-up is required and which reduces the over-all height of the set-up thus reducing the distance between the working tool and the supporting structure for the work-holding device.
A further object of the present invention is to provide a sine V-block clamping device or work holder in which the work is held in place by parallel clamps with a finished or ground surface resting against a finished or ground surface on the blocks with the clamps also being afiixed to the blocks thereby insuring the accuracy of the work and enabling different sized bushings or other work to be clamped by employing different sized parallel clamps on the block.
Yet another object of the present invention is to provide a sine V-block having holes drilled in the base of the V in the block so that the work may be held in place by the use of screws or bolts which extend part way through the work thus allowing various types of work to be accom plished on the workpiece or bushing.
Yet another important object of the present invention is to provide a sine V-block clamping device or work holder which may be employed on various types of grinders or the like and which is adapted to be affixed to the base or chuck and back rail of such machines in the usual manner with the device being variable in size and relatively simple to use, effective in inexpensive to manufacture.
These together with other objects and advantages which will become subsequently apparent reside in the details of construction and operation as more fully hereinafter described and claimed, reference being had to the accompanying drawings forming a part hereof, wherein like numerals refer to like parts throughout, and in which:
FIGURE 1 is a perspective view of the sine V-block of the present invention;
FIGURE 2 is a top plan view of the device;
FIGURE 3 is a side elevational view of the device with one end portion thereof broken away illustrating the structure of the holes formed in the bottom of the V-shaped notch;
FIGURE 4 is an end view of the device;
FIGURE 5 is a transverse, sectional View taken substantially upon a plane passing along section line 5-5 of FIGURE 3 illustrating further structural details of the invention;
FIGURE 6 is a perspective view illustrating a well known set-up employing a compound angle arrangement;
FIGURE 7 is a perspective view of a set-up employing the present invention illustrating the reduction in height of the working implement; and
FIGURE 8 is a transverse sectional view of the sine V-block illustrating the manner in which the work is held in place by passing bolts up through the center of the V-shaped notch into the work.
Referring now specifically to the drawings, the sine V-block of the present invention is generally designated by reference numeral .10 and is illustrated in FIGURE 1 as being mounted on a magnetic chuck table 12 of a conventional grinder in a conventional manner with gauge blocks 14 being inserted between the sine V-block and the magnetic chuck table 1 2 as deemed necessary and appropriate.
The sine V-block 10 includes a generally rectangular body '16 having a longitudinally extending V-shaped notch 18 in the upper surface thereof with the notch 18 having a longitudinal groove 20 at the bottom thereof. The longitudinal groove 20 is provided with a plurality of holes 24 communicating therewith and extending downwardly and communicating with a counterbored lower end 26 and a relieved bottom edge 28 of the body 16.
Extending outwardly from the top edges of the V- shaped notch 18 are top surfaces 30 having tapped holes or sockets 32 formed therein for receiving holddown clamps 34 retained in place by cap screws 36 or the like. The inner edges of the holddown clamps 34 are bevelled along the upper edge thereof as at 38 and overlie and engage a workpiece 40 in the shape of a generally semi-cylindrical bushing or the like so that work may be performed on the workpiece 44) such as by forming a groove or finished surface 42 thereon when using a grinder 44 such as illustrated in FIGURE 7 or any other similar type of working tool.
The block 16 has en'd surfaces 46 and side surfaces 48 with the meeting corners of the end and side surfaces having a right angular recess 50 formed therein by perpendicular intersecting wall portions with the portion of the side wall 48 intersecting with the recess 50 being slightly inwardly offset or relieved as at 52.
A cylindrical sine 54 is mounted in each recess 50 and is retained in place by countersunk cap screws 56. The top ends of the sines 54 are flush with the top surfaces 30 and the bottom ends of the sines 54 are rounded as at 58 to form generally a semi-cylindrical lower edge which terminates flush with the lower periphery of a plurality of cylindrical end sines 60 which extend between the lower ends of the sines 54 and in alignment operation and relatively 3 with the end surface 46 asilIustrated in FIGURE 3 and being retained in place by cap screws 62 thus providing sines 54 and 60 at both ends and both sides of the sine V-block 10.
FIGURE 6 illustrates an old method of clamping a workpiece 40 in a conventional V-block 10 in relation to a grinder wheel 44 which is orientated above the chuck table 12 a hub height A by virtue of the block 10 being supported by a well-known compound angle assembly 64. In comparison with this, FIGURE 7 illustrates the sine V-block of the present invention disposed directly on the chuck table 12 and orientated in desired relation thereto by gauge blocks such as gauge block 14 illustrated in FIGURE 1 or gauge blocks 66 illustrated in FIGURE 7 so that the grinder 44 has a hub height B above the chuck table 12 which is considerably less than the hub height A as illustrated in FIGURE 6 thereby enabling the sine V-block 10 of the present invention to be employed with machines having a lesser working area height as compared with the old method of supporting a conventional V-block 10 on a compound angle assembly 64. Also, the elimination of the compound angles enables the work 40 to be set up much more rapidly than the work 40' could be set up. When grinding a split bushing as illustrated in FIGURE 1, both halves of the split bushing can be ground on the sine V-block and when the draft or relief on the bushing is to be ground, the operator does not have to get a sine vise and the like since it is only necessary to obtain the 'proper sine gauge block and put it on the lower side of the sine V-block or under it or both whichever the case 'may be. Then by having the sine on both ends of the V-block, the V-block may be merely reversed and the draft or relief is formed on the other side thereof. The bushing can be retained by the clamps or by cap screws 27 extending up through the holes 24 from the underside of the V-block. The clamps 34 are ground parallel to the block and by having different size clamps, an operator can grind different size bushings and by merely tightening up to the ground surface, the bushings always are orientated back to an original setting.
The parallel clamps provides a finished surface engaging a finished surface on the block thus insuring the accuracy of the work and by using different size clamps, different sized bushings may be secured in place or the bushings may be held in place by the cap screws or bolts 27 as illustrated in FIGURE 8. The accurate positioning of the workpiece and the reduction of time in the set-up as well as the facility for etficiently carrying out the machine operation, provides a novel and unique sine V- block clamping device or work holder that may be employed in substantially every machine shop or the like.
The foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly all suitable modifications and equivalents may be resorted to, falling within the scope of the invention as claimed.
What is claimed as new is as follows:
1. A workpiece holding device comprising a rectangular body having precision perpendicular surfaces thereon,
the top surface of said body having'workpiece engaging means thereon, means securing a workpiece in said workpiece engaging :means, the vertical corners and the end bottom corners of said body each having a recess therein with each recess having a precision cylindrical sine mounted therein for engagement with a precision supporting table surface whereby gauge blocks may be placed directly under the sine for accurately positioning the workpiece in relation to the table surface, the workpiece engaging means including a V-shaped notch formed in the top surface of said body, said V-shaped notch including a groove at the bottom thereof, said groove having generally parallel side walls to eliminate accumulation of debris in the bottom of the notch, sai'd notch communicating with the top surface of the body with the top surface of the body outwardly of the notch being accurately machined, said means for securing the workpiece including a pair of clamp plates having machine surfaces engaging the machined top surface of the body and having inner edges extending laterally inwardly of the top edges of the notch, and clamp screws extending through the clamp plates and into the body for securing the clamp plates in place.
2. A workpiece holding device comprising a rectangular body having precision perpendicular surfaces thereon, the top surface of said body having workpiece engaging means thereon, means securing a workpiece in said workiece engaging means, the vertical corners and the end bottom corners of said body each having a recess therein with each recess having a precision cylindrical sine mounted therein for engagement with a precision supporting table surface whereby gauge blocks may be placed directly under the sine for accurately positioning the workpiece in relation to the table surface, the workpiece engaging means including a V-shaped notch formed in the top surface of said body, said V-shaped notch including a groove at the bottom thereof, said groove having generally parallel side walls to eliminate accumulation of debris in the bottom of the notch, said means for engaging the workpiece including a plurality of openings extending vertically through the body and communicating with the groove in the bottom of the notch, and fasteners extending upwardly through said openings for engaging and securing a workpiece in the notch.
References Cited UNITED STATES PATENTS 1,535,570 4/1925 Bryant 7762 2,406,514 8/ 1946 Squire.
2,347,111 4/ 1944 Jesionowski.
2,364,150 12/ 1944 Lowenstein.
2,734,403 2/1956 Timpner 7762 2,756,508 7/1956 OGrady 33174 FOREIGN PATENTS 569,560 5/1945 Great Britain.
HAROLD D. WHITEHEAD, Primary Examiner.
US. Cl. X.R.