US2417729A - Grinding machine - Google Patents

Description

March 18, 1947. R. 1.. B AZLEY GRINDING MACHINE Filed Oct. 5,

1944 3 Sheets-Sheet l BY a Rf VZ mm m L A. h M K March 18, 1947. Z E 2,417,729

' GRINDING MACHINE I Filed Oct. 5, 1944 v 5 Sheets-Sheet 2 IN VEN TOR.

Eaulz L. Bazle y,

HTTOBJVE'Y March 18, 1947. R BAZLEY 2,417,729

GRINDING MACHINE Filed Oct. 5,1944 3 Sheets-Sheet 3 v IN VEN TOR. I Ralph L; Bazlayg aTTmm/IY Patented Mar. 18, 1947 UNITED STATES aim GRINDING MACHINE poration of Michigan Application October 5, 1944, Serial No. 557,261

4 Claims. 7 (01. 51-122) This invention relates to a grinding machine for grinding flat plane surfaces in definite angular relation on a workpiece.

An object of the invention is to provide a grinding machine with means for associating a workpiece with the grinding wheel, movin the workpiece transversely of the face of the wheel, rotating the workpiece to a predetermined angular relation, and again moving it transversely of the face of the grinding wheel to establish two plane surfaces in definite angular relation.

Other objects and features of this invention will be readily apparent to those skilled in the art from the specification and appended drawings illustrating certain preferred embodiments in which:

Figure 1 is a side elevational view of the grinding machine according to the present invention.

Figure 2 is a partial front elevational view of the rindin machine.

Figure 3 is a partial top plan view of the machine.

Figure 4 is a partial vertical sectional view through the grinding machine on the line IVIV of Figure 3.

Figure 5 is a detailed view on line V-V of Figure 3.

Figure 6 is adetailed sectional view on the lines VI-VI of Figure 3.

Figure 7 is a top plan view of a workpiece.

Figure 8 is a side elevational view of a Workpiece. a

The grinding machine, according to the present invention, comprises a table I upon which is supported a motor 2 and a grinding wheel 3 driven thereby through a gear system, not shown, contained in the gear housing 4. The housing 4 supports a bracket 5 having a pair of side wings 3 in which is pivotally supported a platform 1- having a way portion 8 received in a slide 9 movable with respect to the platform 1 in a direction paral el to the face of the grinding wheel 3. On the slide 9 is mounted a plate ll adjustable by means of slots l2 and studs I3 toward and away from the face of the grinding wheel. In the plate I l is mounted a pivot post i4 upon which is pivotally mounted a work holder I5. A

In the inner end of the work holder I5 is mounted an index plate 16 against which is upon the top surface of the work holder I5 and comprises spaced angle brackets I 8 between which is pivoted a latch arm l9 carrying an adjustable stud 2i engaging and clamping the workpiece. Upon the brackets i8 is pivoted a manual operator 22, and a pair of links 23 interconnect the operator 22 and the arm 23 to perform the latching and unlatching operation. To the front end of the work holder I5 is pivotally connected a latching handle member 24 upon the pivot 25. Upon the under surface of the work holder is mounted an L shaped member 26 in the horizontal leg'of which is disposed a spring biased frictional element 2'! engaging the under surface of an uncut notch 28 in the arcuate front surface of the plate H as more particularly illustrated in Figure 5.

- The opposite front corners of the plate H areprovided with arms 29 and 3! in which are ad-- From the; bottom of the work holder l5 there projects a pin justably disposed stops 32 and 33.

3 5 engageable with the stops 32 and 33 to limit the extreme positions of the work holder l5.

of their supporting studs so that they are transversely adjustable with rotation of the studs.

The handle element 24 is provided with two arms 31 and 38 having hook portions at their ends cooperating with the pins 35 and 36 to latch the work holder E5 in its opposite extreme positions.

The upper center of the way portion 8 of the platform I is hollowed out at 39. To the left hand under surface of the slide 9 there is attached a rack A! disposed partially within the opening 39. Upon the platform 1 is mounted an extension "52 carrying a pivot pin 43 on which are mounted a sector 42 and manual operator 45 with the teeth on the sector 44 engaging with the teeth on the rack 4|.

The housing 4 has a pan extension 43 carrying a pair of trunnions 41 in which is pivotally mounted a shaft 48 carrying a cam 49, the shaft being connected to and rotatable by the manual crank 5!. The platform I is provided with an adjustable follower 52 engaging the surface of the cam 39. The platform 1 is provided withan integral upwardly directed arm 53 carrying an adjustable stop 54 engaging the head of the, clamped the workpiece IT. The clamp is mounted stud 55. Within the opening 39 the platform 1' 3 is provided with a stop stud 56 cooperating with a pair of spaced stop studs 51 secured to the slide 9 to limit the extreme positions of reciprocation of the slide and workpiece.

In the operation of the machine, the position of the plate II is adjusted toward and away from the face of the grinding wheel by means of the stud and slot engagement iii-l2. ihe stop 54 and the follower 52 are adjusted to dispose the surface of the work holder at right angles to the plane of the grinding wheel face. The stops 32 and 33 are adjusted to produce the desired angular rotation for the workpiece which, in this case, is a 90 angle as shown in Figure 8. In Figures 7 and 8, representing the work performed by the machine upon a blank of optical glass in the formation of a right angle prism, the dotted lines indicate the initial blank and the full lines the workpiece after the grinding operation to form the right angle faces is performed.

Th machine is in its work receiving position as shown in Figure 1 in which the crank has been rotated to permit the platform I to rotate in a clockwise direction. The workpiece I! is then inserted in position on the work holder and clamped by manipulation of the manual operator 22. The work holder is placed in one extreme position such as that of Figure 3 with the hook at the end of the arm 38 engaging the latch pin 36. The crank 5! is thereafter rotated forwardly to place the workpiece into contact with the face of the grinding wheel. The handle 4-5 is rotated to rotate the sector 44 and effect a transverse movement of the rack 4| which resultsin a movement of the slide 9 and hence a transverse movement of the workpiece i'l across the face of the grinding wheel. When one face has been completed, the crank 58 is rotated rearwardly to place the platform I in the position of Figure 1. The handle 24 is then manipulated to unlatch the pin 36 from the arm 38 and the work holder l5 is rotated about its pivot M into the position where the pin 34 engages the stop 32, whereupon the hook at the end of the arm 31 is engaged with the latch pin 35. Thereafter the crank 5| is again moved forwardly and the arm again rotated to move the second face of the workpiece transversely across the face of the grinding wheel.

With the machine according to the present invention accurate flat plane surfaces can be placed upon the workpiece with the desired predetermined angle accurately adjusted between the plane surfaces. The reciprocation of the workpiece across the 'face of the rotating grinding wheel maintains the grinding face as a plane and increases the life and accuracy of the wheel by preventing the formation of a groove therein.

While certain preferred embodiments of the invention have been specifically disclosed, it is understood that the invention is not limited thereto, as many variations will be readily apparent to those skilled in the art and the invention is to be given its broadest possible interpretation within'the terms of the following claims.

What is claimed is:

1. In a machine for grinding plane surfaces on a workpiece in predetermined angular relationship, a grinding wheel having a radial, planar, grinding face, means for rotating said wheel about an axis perpendicular to said grinding face, a pivotally mounted platform, a manually rotatable cam having its surface engaging a part on said platform for bodily rotating said platform toward and away from said grindingwheel, stop means indexing the position of said platform in 4 position adjacent the grinding wheel, a slide mounted on said platform for reciprocation in opposite directions parallel to the plane of said grinding face, a plate mounted on said slide and adjustable toward and away from said grinding face, a workholder pivotally mounted on said plate for rotation about an axis parallel to the grinding face and perpendicular to the direction of movement of said slide, means on said plate indexing said workholder in positions of predetermined angular relationship comprising adjustable stops on the plate cooperating with the workholder in opposite positions of movement, cooperable latch means on said workholder and plate for locking the workholder in its indexed positions, and means for effecting reciprocation of said slide to move the workpiece across the grinding face to effect the grinding operation.

2. In a machine for grinding plane surfaces on a. workpiece in predetermined angular relationship, a, grinding wheel having a radial, planar, grinding face, means for rotating said wheel about an axis perpendicular to said grinding face, a platform movable toward and away from said wheel, a slide on said platform reciprocable in opposite directions parallel to the plane of said grinding face, a workholder on said slide, means for moving said platform to place the work into and out of association with said grinding face, means on said slide indexing said workholder in positions of predetermined angular relationship including stops adjustable to maintain said relationship, and means'for locking said workholderin its indexed positions including cooperating elements on said workholder and slide, one of said elements comprising a latch hook and the other a latch pin adjustably mounted to insure locking in the indexed position.

3. In a machine for grinding plane surfaces on a workpiece in predetermined angular relationship, a grinding wheel having a radial, planar,

grinding face, means for rotating said wheel about an axis perpendicular to said grinding face, a platform pivotally mounted for rotation bodily toward and away from said grinding wheel, a manually rotatable cam engaging with a part on said platform to effect its rotation, means indexing said platform in its working position, a slide on said platform reciprocable in opposite directions parallel to the plane of said grinding face, means for effecting reciprocation of said slide to perform the grinding operation, a workholder mounted on said slide and movable to positions of predetermined angular relationship when said platform is rotated out of working position, and means for indexing said workholder in said predetermined positions.

4. In a machine for grinding plane surfaces on a workpiece in predetermined angular relationship, a grinding wheel having a radial, planar, grinding face, means for rotating said wheel about an axis perpendicular to said grinding face, a platform pivotally mounted for rotation bodily toward and away from said grinding wheel, a manually rotatable cam engaging with a part on said platform to effect its rotation, means indexing said platform in its working position, a slide on said platform reciprocable in opposite directions parallel to the plane of said grinding face, means for effecting reciprocation of said slide to perform the grinding operation, a workholder mounted on said slide and movable to positions of predetermined angular relationship when said platform is rotated out of working position, means for indexing said workholder in said predeter- RALPH L. BAZLEY.

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

UNITED STATES PATENTS Number Name Date 1,444,598 Ferguson et a1 Feb. 6, 1923 135,131 Kohler Jan. 21, 1873 238,366 Doane Mar. 1, 1881 Number 6 Name Date Coleman Aug. 19, 1919 Mantle Aug. 19, 1919 Sterne et a1 Mar. 16, 1943 Williams May 1, 1923 Fisher July 25, 1933 Gorton July 25, 1933 Holhut et a1 Jan. 4, 1939 Zwick Jan. 17, 1939 Helfgott Aug. 12, 1941 Haigis Oct. 9, 1883 Stanbrough Jan. 31, 1893 Kampfe June 7, 1887 Stocking Jan. 3, 1939 Lilljiquist Nov. 15, 1910 K. Williams Feb. 8, 1927 J. Hampton Dec. 27, 1887

Images