US2725049A

US2725049A - Profiling dresser for grinding machine

Info

Publication number: US2725049A
Application number: US185949A
Authority: US
Inventors: Harry S Jakobsen
Original assignee: Airborne Accessories Corp
Current assignee: Airborne Accessories Corp
Priority date: 1950-09-21
Filing date: 1950-09-21
Publication date: 1955-11-29
Anticipated expiration: 1972-11-29

Description

N 955 H. s. JAKOBSEN PROFILING DRESSER FOR GRINDING MACHINE 2 Sheets-Sheet 1 Filed Sept. 21 1950 Fig. I

INVENTOR. Harry S. Jakobsen BY TO NEY.

Nov. 29, 1955 H. s. JAKOBSEN 2,725,049

PROFILING DRESSER FOR GRINDING MACHINE Filed Sept. 21, 1950 2 Sheets-Sheet 2 IIIIIIIIITIIUI INVENTOR. Harry S. Jakobsen ATT RNEY.

United States Patent 2,725,049 PROFILING DRESSER Fort GRINDING MACHINE Harry S. Jakobseu, Washington Township, Morris County, N. 3., assignorto Airborne Accessories Corpor'a'tiori, Hillside, N. J., a corporation of New Jersey Application September 21, 1950, Serial No. 185,949

2 Ciaims. (Cl. 125-11) This invention relates to a profiling dresser for grinding machines, and is shown as an accessory to a grinding machine embodying a grinding wheel.

The object of the invention is to provide as an accessory to a grinding machine a simple and efficient means for mounting a dresser tool and tracer so that they may be readily swung to and from position with reference to the grinding wheel, and may also be easily reversed in position to bring the tracer into contact with the wheel and the dresser tool in position against a template.

(Dther objects and advantages of the invention will be in part obvious and in part pointed out hereinafter.

The invention accordingly comprises the features of construction, combinations of elements, and arrangement of parts, which will be exemplified in the construction hereinafter set forth, and the scope of the application of which will be indicated in the claims.

For a fuller understanding of the nature and objects of the invention reference should be had to the following detailed description taken in connection with the accompanying drawings, in which:

Figure 1 is a side elevation illustrating a conventional grinding wheel with a dresser tool mounted in accordance with my invention for operation thereon;

Fig. 2 shows the reversal of the part carrying the dresser tool and the tracer as compared with the showing of Fig. 1;

Fig. 3 is a top plan view looking down on the mechanism shown in Fig. 1; and

Fig. 4 is an enlarged detail showing the means for adjustably mounting the dresser tool and the tracer within the adjustable and reversible member by which they are carried.

In the drawings A is a conventional illustration of a grinding wheel upon a suitably driven shaft a, carried by an upright or column B, which in turn is supported by the base C of any of the well known forms of grinding machines.

Shown in operating position with reference to the grinding wheel A is a dresser tool 1, commonly called in the trade a diamond point. This tool is mounted on member 2, and carried by the lower end of member 2 is a tracer 3 working over a template 4 adjustably and moveably carried, as by set screw 5, on the block 6 adjustably mounted upon the base C. Member 2 is mounted upon the member 7 as by the sliding

dovetail connections

8 and 9 shown in Figs. 1 and 2, so that the member 2 may be adjustably moved along the member 7 and held in place at any desired adjusted position by the set screws 10, and may also be moved from member 7 and replaced in reverse position with the dresser tool at the lower end and the tracer at the upper end.

The member 7 is pivotally mounted on member 11 as by the pivot rod 12 passing through the opening in member 11, and member 11 is similarly pivotally mounted upon the column B by the pivot rod 13 carried by column B and passing through the inner end of member 11. Said

members

7 and 11 constitute a carrier for block or member 2 and has universal movement in a plane.

2,725,049 Patented Nov. 29,1955

ice

Turning. now to the more detailed showing of Fig. 4, the dresser tool 1 is carried in the cut out of the part 16 which is carried by 2, and the tool is adjustable horizontally to a point fixed by the position of the set screw 14 and held in any desired position by the set screw 15. The

part 2' at its lower end carries tracer 3 adjustably mounted therein by block 18 and set screw 20',

It will now be seen that with the construction shown, the dresser tool is pivotally mounted on the grinding machine so that it can be folded and swung out of the way when not in use. The dresser tool and tracer are mounted in the upper and lower'ends, respectively, of a precision adapter readily detachable from the rest of the assembly. Flexibility is provided by the two intermediate pivot points. The dressing is performed by guiding the tracer by hand over the template contour. Extreme rigidity of the pivoted members permits the tool to reproduce faithfully the exact form required on the wheel. The universal action of the hinged dresser tool combined with the ability to rotate the tool and tracer gives the utmost freedom to the tracing motion. The two swivel joints of the dresser tool duplicates the action of the human arm, and the operation is as effortless as drawing with a pencil.

With the construction as shown there is also provided simple means of correcting the tracer nose to correspond exactly to the shape of the diamond point. Variation in diamond contour from the theoretical shape is the major source of inaccuracy, which necessarily depends on the precise diamond form and dimension. The unit holding the diamond and the tracer is easily removed from the dresser tool. Then this unit may be placed on the base and the wheel dressed to the exact form of the diamond. Then the nose of the profile tracer can be ground to the form of the exact shape of the diamond point. The unit can then be replaced with the dresser tool ready for the grinding process. Or this correction can be made by reversing the position of the tool and tracer carrying member, as shown in Fig. 2.

The wheel is first dressed to the approximate shape of the template selecting the straightest portion of the template for this operation, then the reversal of part 2 is made as shown in Fig. 2, and the tracer will be ground to the exact counterpart of the diamond tool by a rotating or oscillating motion, holding the diamond against the template and letting the periphery of the wheel thereby grind the same contour on the tracer.

Since certain changes may be made in the above construction, and different embodiments of the invention could be made without departing from the scope thereof, it is intended that all matter contained in the above de' scription or shown in the accompanying drawing shall be interpreted as illustrative and not in a limiting sense.

It is also understood that the following claims are intended to cover all of the generic and specific features of the invention herein described, and all statements of the scope of the invention which as a matter of language might be said to fall therebetween.

I claim:

1. In a grinding machine having a base, an upright supported on the base and a grinding wheel mounted on a shaft carried by said upright, a link member pivotally mounted on said upright, an arm member pivotally mounted at one side thereof on said link member with the pivotal axes of said link member and arm member in parallel relation, said arm member having its other side formed with a dovetail guide opening through at least one end thereof, a block member formed with a dovetail groove slidably mating the dovetail guide of the arm member in either upright or reversed position, means holding said block member at any adjusted position on the arm member, a dresser tool, means for adjustably supporting said dresser tool at one end of the block member, a tracer, means for adjustably supporting said tracer at the opposite end of the block member with said tracer extending substantially parallel to and in alignment with said dresser tool, and a template supported by the base in position to cooperate with said tracer, whereby said block member may be reversed to apply said tracer to the grinding wheel and said tool to said template.

2. In a grinding machine having a support and a grinding Wheel mounted on a shaft carried by said support, a carrier, means mounting said carrier for universal movement in a plane on said support, a block member, said carrier and block member having a slidably mating dovetail guide and groove connection in either upright or reversed position of said block member, means holding said block member at any adjusted position on the carrier, a dresser tool, means for adjustably supporting said dresser toolat one end of the block member, a tracer, means for adjustably supporting said tracer at the opposite end of the block member with said tracer extending substantially parallel to and in alignment with said dresser tool, and a template mounted on the support in position to cooperate with said tracer whereby said block member may be reversed to apply said tracer to the grinding wheel and said tool to said template.

References Cited in the file of this patent UNITED STATES PATENTS 528,337 Morgeneier Oct. 30, 1894 1,193,049 Olson Aug. 1, 1916 2,305,115 Sneed Dec. 15, 1942 FOREIGN PATENTS 448,001 Great Britain May 29, 1936 475,096 Great Britain Nov. 8, 1937