US1734914A - Wheel-truing fixture - Google Patents

Description

Nov. 5, 1929. c. L. OTT

WHEEL mums FIXTURE Filed March 10. 1928 2 Sheets-Sheet 1 l I I I I Fl] uuuunn f INVENTOR.

CONRAD L... O'T'T'.

A ORNEY.

Nov. 5, 1929. c. L. OTT

WHEEL TRUING FIXTURE Filed March 10, 1,928 2 Sheets-Sheet 2 INVENTOR.

c ONRHD 1.. OT'TZ Patented Nov. 5, 1929 V UNITED, STATES PATENT OFFICE ,"CONRAD L. OTT, OF WAYNESBORO, PENNSYLVANIA, ASSIGNOR TO THE LANDIS TOOL 00., OF WAYNESBORO; PENNSYLVANIA, A CORPORATION WHEEL-TRUING FIXTURE Application filed March 10, 1928. Serial No. 260,622.

My invention relates to wheel truing fixtures for multiple wheel grinding machines and it is an object of the invention to provide means whereby a, single diamond may be used to dress a plurality of wheels of varying diameters mounted on a common Wheel spindle. I

A further object of the invention is to provide a wheel truing device which may be,

adjusted to provide for variation in the degree of hardness of the grinding wheels.

Another object is to provide a non-rotatable mounting for the cutting tool.

Further objects and advantages will hecome apparent as the description proceeds. Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a plan view of the device, Figure 2, a section'on line 2-2 of Fig. 1, Figure 3, an end view of an adjustable gage block, and

Figure 4, a partial end elevation of the device, parts being shown in section.

l/Vith truing devices adapted for use in grinding machines having a plurality of grinding wheels of different diameters,it has heretofore been customary to provide a sep arate truing or cutting tool for each wheel and tools were mounted in a single bracket and movable to position to dress all of the wheels at the same time. A serious objection to this method of wheel truing lies in the fact that all the tools would not be worn uniformly because of a difference in the hardness of the grinding wheels. WVith my device I use a single dressing tool which has a fixed position for dressing one of the wheels and is adjustable to one or more positions for dressing one or more additional wheels. The adjustable positions may also provide for variation in the hardness of the grinding wheel by taking account of the wearing effect on the cutting tool made by the grinding wheel. I

In the drawings numeral 10 indicates the reciprocable carriage of a grinding machine on which may be mounted a base 11. This base in turn carries a slide 12 removably mounted thereon. A plunger 13 is slidably mounted within the slide 12. This plunger carries an extension 14 in the front end on which is mounted the cutting or dressing tool 15. 16 and 17 indicate the head stock and tail stock which carry the work 18. In this instance,-the work has cylindrical portions 19 and 20 of different diameters which of a bolt or screw 23 and a U-shaped washer 24 as shown in Fig. 2. In order to remove the slide from the base 11, the screw ..3 is loosened and the washer 24 slipped out whereupon the slide may be lifted from the base. The plunger'13 is secured inposition on the slide 12 by means of a screw 25 screw threaded through a cover 26 the end of the screw resting on a clamping block 27 The cover is held upon the slide 12 by means of screws or bolts 28. The slide 13 is somewhat V-shaped in cross section and fits in a corresponding groove. This prevents rotation of the plunger in its seat. Any rotation of this plunger would throw the cutting tool out of position with respect to the grinding wheel. The plunger 13 has an undercut side at 29 at its rear and a knob or handle 30 by means of which it is slid-ably adjusted in the slide 12. The slide 12v has a portion 31 which extends up into the recess 29 on' the rear of the plunger. This portion 31 has a hardened pin 32 firmly seated in a bore herein. A corresponding hardened pin is seated in the plunger 13 adjacent the pin 32.

means of which pin the block is held to the slide. A pin 89 through the slot supports the gage block suspended from the pin. The two wedge-shaped halves of the gage block are clamped together by screws 40. These screws fit loosely in holes in the blocks in such a way as to allow a slight relative endwise movement of the wedge members of the block in order to vary the thickness of the lock.

Positioned in a bore ll in the plunger is a compression spring 42 which seats injthe bottom of the bore and against the upstanding portion 31 on the rear of the slide 12. This spring to urge the plunger forward so that the hardened pin 33 is held against the hardened pin 32 or against the age block when that is in position as shown in Fig. i.

l he operation of the device is as follows: lVith the gage block 3% in a lowered position the pin 38 will rest against the pin 32 and the cutting tool will be in the position sho vn in dotted lines in Fig. 1 in order to dress the grinding wheel 21. When this wheel has been dressed, the gage block 18 insertcd between the pins 33 and 32 whereupon the plunger is held in the position where the cutting tool will dress tie grinding wheel 22, such as shown in full lines in Fig. 2. The thickness of the gage block is adjusted accurately to equal the value of the differences between the two radii of the portions 19 and 20 of the work piece 18 which is to be ground. It may occur that the grinding wheel 21 is harder than the grinding wheel 22 and therefore that in dressing this wheel the cutting tool will be slightly worn'a wa'y. The nature of the work also may be such as to cause unequal'wear on the grinding wheels. In order to provide for this, the gage block, shown in Fig. 3, is slightly adjustable for thickness, the screws 40 are loosened and the wedge-shaped halves of the gage moved so as to change the thickness of the block by an amount equal to the amount the cutting tool is worn during a dressing operation. Instead of a block having wedgeshaped 'members slidable upon each other, any adjustable n'ieans may be used in place of the block 3 f.

After the truing operation, above described, the screw 23 is loosened and the washer 2a removed whereupon the slide 12 may be lifted from the base 11 until itis desired again to dress the wheels.

It will be obvious to those skilled in the art that various changes may be made in my device without departing from the spirit of the invention, and I, therefore, do not limit myself to what is shown in the drawings and described in the specification, but only as set forth in the appended claims.

Having thus fully described my said invention, what I claim as new and desire to secure by Letters Patent, is:

1. A wheel truing fixture comprising a base, a slide removably mounted thereon, a plunger in said slide, a dressing tool carried by said plunger, resilient means for urging said plunger in a fixed forward position for dressing one wheel, and a block movable to engage aportion of the plunger tohold it in a position back of the fixed position to dress a wheel of a diameter greater than that of the first named wheel, substantially as set forth.

2. A truing fixture for a plurality of grinding wheels comprising a slide, a plunger on saidslide, means for holding the slide in a fixed position for dressing one wheel, and a block movable to engage a portion of the plunger for holding it-inan adjusted position for dressing a wheel of a different diameter, substantially as set forth.

3. AWheel truing device for a plurality of grinding wheels of different diameters co1nprising a slide. a plunger in said slide, a dressing tool in said plunger, acontact point on saidslide enga-geable-by a contact point on said plunger to position the plunger to dress one of said wheels, a block vertically adjustable on said slide and positionable between said contact points to hold the plunger in position to dress a wheel of greater diameter, and means for varying the thickness of said block to vary the position of said dressing tool, substantially as set forth.

1. A. wheel truing fixture, comprising a base, a slide mounted thereon, a plunger in said slide, means for preventing rotation of said plunger, a dressingtool carried by said plunger, means forholding said plunger in a fixed position to dress one wheel, and a block movable to engage the plunger for holding said plunger in another position to dress a wheel of a different diameter, the said block being adj ustablein thickness,substantially as set forth.

In witness whereof, I have hereunto set my hand at lVayne'sboro, Pennsylvania, this 8th day of March, A. D.,- nineteen hundred and twenty-eight.

CONRAD L. OTT.

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