US2110441A - Grinding machine - Google Patents

Description

March 8, 1938. I c KASCH 2,110,441

GRINDING MACHINE Filed Oct 10, 1954 2 Sheets- Sheet 1 55 I I Z8 57 fp I l 8 BY WW4 ATTORNEYj March 8,1938. I 1 Q'HKASCH 2,110,441

GRINDING MACHINE 2 SheetsSheet 2 Filed Oct. 10, 1934 INVENTO 6 34M ATTORNEYE Patented Mar. 8, 1938 PATENT OFFlCE 2,110,441 GRINDING MACHINE Charles H. Kasch,

Davenport, Iowa, assignor, by

mesne assignments, to Micro-Weston, Inc., Bettendori, Iowa, a corporation of Delaware Application October 10, 1934, Serial No. 747,665

10 Claims.

This invention relates to grinding machines, and more particularly to machines for sharpening cutter blades of the scalloped type.

One of the objects of the present invention is to provide an improved grinding machine for sharpening scalloped type cutter blades by means of which a prefectly ground cutting edge can be obtained.

Another object is to provide a grinding machine which is semi-automatic in nature and which is of such character that scalloped cutter blades can be quickly and easily sharpened.

Another object is to provide a grinding machine for sharpening cutter blades in which the 5 blade is held without distortion between the points thereof.

A further object is to provide a grinding machine for sharpening scalloped cutter blades in which the coolant is forced against the blade and grinding wheel directly at the point of grinding contact, so as to keep the cutting edge being ground cool and from losing its temper.

With the above and other objects in view the present-invention consists in certain features of construction and combinations of parts to be hereinafter described with reference to the accompanying drawings and then claimed.

In the drawings:

Fig. 1 is a vertical, longitudinal section taken through the grinding machine, showing the posi-- tion of the grinding wheel and showing the work holding member;

Fig. 2 is a reduced side elevation of the opposite side of the grinding machine showing the mechanism for actuating the work holding carriage and showing the carriage in its lowermost position;

Fig. 3 is a section taken approximately on the line 3-3 of Fig. 1, showing the openings in the partition which provides the machine base with a grinding wheel compartment and a work compartment;

' Fig. 4 is a plan view of the grinding machine shown in Fig. 1, the splash guard being swung to its open position to show the work holding means;

Fig. 5 is a section taken approximately on the line 5-5 of Fig. 1;

Fig. 6 is a fragmentary side elevation of a cutter blade which is of the general character to be sharpened on the machine of the present invention; and

Fig. 7 is a diagrammatic perspective view showing the method or mounting the cutter blade on the work support.

Referring to the accompanying drawings, in which like numerals refer to like parts throughout the several views, the apparatus is particularly adaptable for use in sharpening cutter blades of the general character illustrated in Fig. 5 6, wherein the blade A is formed along one edge with a series of scallops I to form points 2, and which scallops are beveled at 3 at each side be tween, the points 2 to provide a sharp cutting edge. 10

. The machine is preferably supported on a suitable support 4 having upstanding portions 5 which engage leg portions Be that depend from the machine base 6. The base 6, as shown in Figs. 4 and 5, with an upstanding peripheral wall 62) which is divided by a transversely extending partition 1 into a grinding wheel compartment 8 and a work compartment 9, the partition 1 having a central opening l0 therein substantially midway between 20 its upper and lower edge through which the grinding wheel may extend, as will be later described.

The partition 1 also is provided adjacent one of the side walls, with an opening H for the pas- 25 sage of a coolant between the two compartments.

Mounted over the grinding wheel compartment 8 is a plate-like member 12 having an aperture l3 therein. This member 12 carries spaced parallel guideways M which slidably support a mo- 30 tor slide plate 15. An electric motor 16 is bolted to the slide plate 15, and has its shaft 11 extending through the plate l5 and through the aperture. 13. The grinding wheel I8 is secured to the shaft ll below the plate-like member I2 and in 35 alignment with the opening II) in the partition 1, the wheel being held on the motor shaft 11 by means of a nut [9 which extends nearly to the bottom of the compartment 8 and which is provided with an impeller 20. o

The slide plate I5 is formed with an internally threaded portion 21 which receives a threaded adjusting screw 22, the screw being rotatably mounted and held against axial movement in a journal 23 which is secured to the plate-like 45 member 12. A thumb screw 24 is provided in the journal to hold the screw 22 against inadvertent rotation when the motor and grinding wheel support is in its adjusted position. By rotating the adjusting screw 22 the grinding wheel [8 is moved into and out of the opening III, as the case may be, so as to remove the proper amount of metal from the cutter blade to be sharpened.

The partition I is provided with an arcuate leading portion 25 extending from the one side 55 is oval in shape and provided 15 i bottom edge of the opening Ill. The shelf 63 also inclines upwardly and inwardly from the wall of the grinding wheel chamber 8. This shelf, together with the arcuate portion 25, is provided so that as the coolant is agitated and given a circulatory motion by the propeller 28 it will travel in the direction of the arrow indicated in Fig. 5 in a rising circular pathgpd be directed against the grinding wheel which by reason of centrifugal force, directs or throws the coolant through opening Ill into contact with the cutter blade being ground, substantially at the region of contact of the grinding wheel therewith. The coolant then drops into the work chamber where the minute particles of metal will settle to the bottom of the chamber '9, the clean coolant being allowed to circulate by reason of the opening I I back into the grinding wheel chamber 8.

It is to be noted that this action or circulation of the coolant actually forces the grinding solution against the cutter blade at the point of contact between the cutter blade and grinding wheel.

In order to insure that the level 58 of the coolant will not be above the lower edge of the opening in, an opening 84 is provided in the tubular guide 21 adjacent the partition 1, whereby the coolant may drain through this opening 64 and discharge through the tubular guide 21 through the bottom of the machine.

A suitable drain opening, closed by a plug 65, is also provided for the work chamber 9 to provide for the draining of the coolant from the chambers 8 and 9.

Although a single embodiment of the invention has been herein shown and described, it will be understood that numerous details of the construction shown may be altered or omitted without departing from the spirit of this invention as defined in the following claims.

What I claim is:

1. In a grinding machine, a grinding wheel chamber, a work chamber, a partition separating said chambers and having an opening therein intermediate its top and bottom edges, said chambers being in communication with each other and arranged to contain a coolant, a grinding wheel horizontally disposed within said first mentioned chamber and having a portion of its grinding surface projecting through said opening into said work chamber, a work support in said work chamber, means for rotating said wheel, means within said grinding wheel chamber for imparting circulatory motion to the coolant within said grinding wheel chamber, and means within said grinding wheel chamber for directing the coolant into contact with said wheel where it is thrown by centrifugal force through said opening into said work chamber and against the work carried by said support at the region of grinding contact of said wheel therewith, said last mentioned means including a shelf rising gradually upwardly from the bottom of said griding wheel chamber and extending in a circular path and terminating. below said wheel at the region of the bottom of said p n ng.

2. In a grinding machine, a grinding wheel chamber, a work chamber, a partition separating said chambers and having an opening therein intermediate its top and bottom edges, said chambers being in communication with 'each other and arranged to contain a coolant, a grinding wheel horizontally disposed within said first mentioned chamber and having a portion of its grinding surface projecting through said opening into said work chamber, a work support in said work chamher, means for rotating said wheel, an impeller in said grinding wheel chamber driven by said grinding wheel, for imparting circulatory motion to the coolant, and means within said grinding wheel chamber for directing the coolant against said wheel where it is thrown by centrifugal form throughsaid opening into said work chamber and against the work carried by said support at the region of grinding contact of said wheel therewith.

3. In a grinding machine, a grinding wheel chamber, a work chamber, a partition separating said chambers and having an opening therein intermediate its top and bottom edges, said chambers being in communication with each other and arranged to contain a coolant, a grinding wheel horizontally disposed within said first mentioned chamber and having a portion of its grinding surface projecting through said opening into said work chamber, a work support in said work chamber, means for rotating said wheel, means within said grinding wheel chamber for imparting circulatory motion to the coolant within said grinding wheel chamber, and means within said grinding wheel chamber for directing the coolant against said wheel and through said opening into said work chamber and against the work carried by said support at the region of grinding contact of said wheel therewith, the level of coolant being below the lower dde face of said'grinding wheel and below the bottom of said opening.

4. In a grinding machine, a grinding wheel chamber, a work chamber, a partition-separating said chambers and having an opening therein intermediate its top and bottom edges, said chambers being in communication with each other and arranged to contain a coolant, a grinding wheel horizontally disposed within said first mentioned chamber and having a portion of its grinding surface projecting through said opening into said work chamber, a work support in said work cha ber, means for rotating said wheel, means within said grinding wheel chamber for imparting circulatory motion to the coolant within said grinding wheel chamber, and means within said grinding wheel chamber for directing the coolant against said wheel and through said opening into said work chamber and against the work carried by said support at the region of grinding contact of said wheel therewith, the level of coolant being below the lower side face of said grinding wheel and below the bottom of said opening, one of said chambers having an overflow opening disposed to prevent the rise of level of the coolant above the bottom of said first mentioned opening.

5. In a grinding machine, a chamber arranged to contain a coolant and having a vertically arranged partition to provide a grinding wheel compartment and a work compartment, said partition having an aperture therein, a cover over said grinding wheel compartment and provided with an opening, a plate slidably mounted on said cover, an electric motor mounted on said plate and having a shaft projecting through said opening into said grinding wheel compartment, a grinding wheel secured to said shaft in alignment with said aperture, and means for moving said plate relative to said aperture whereby to adjustably move said grinding wheel through said aperture.

6. In a grinding machine a grinding wheel chamber for holding a coolant, a grinding wheel within said chamber positioned above the normal stationary obstruction in level of said coolant, a

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