US1846132A - Grinding machine - Google Patents

Description

l. MATHEWSON GRINDING MACHINE Feb. 23, 1932.

Original Filed July 19 1927 5 Sheets-Sheet E Il l-x Il.. ULI

FIC; 1

INVENTUR /wf LM 4M A TrnR NE Ys Feb. 23, 1932. M, MATHEWSQN 1,846,132

GRINDING MACHINE original Filed July 19, 1927 5 sheets-sheet 2 F/GZ IN ENTCI/IIV Aww@ M ATFURNEYS Fel). 23, 1932,

M. l. MATHEWSON GRINDING MACHINE Original Filed July 19, 1927 F/GE 3 Sheets-Sheet 3 ATrDRNEYS Patented Feb. 23, 1932 y UNITED STATES PATENT OFFICE,

:MAXWELL I. MATHEWSON, 0F PROVOIDENCE, RHODE ISLAND, ASSIGNOB T0 BROWN Q SHARPE MANUFACTURING COMPANY, .A CORPORATION OF RHODE I GRINDING MACHINE Driginal application led July 19, 1927, Serial No. 206,917. Divided and this application med December 24, 1930.I Serial No. 504,553.

The present invention relates to grinding machines, and more articularly to means for protecting certain o the parts from thewater or emulsion which is necessarily used in the grinding operation. The invention, as herein disclosed, is embodied in a type of machine in which the grinding wheel is mountu ed on a carriage to move toward and away from the work, and the work is mounted on a work supporting table movable back and forth longitudinally of the grinding wheel spindle. In order to catch the water or emulsion which is poured onto the point of contact of the grinding wheel and the work, a trough is provided between the wheel spindle carriage and the work table.

In carrying out the present invention, a novel and improved arrangement of water guards has been provided to protect the wheel spindle carriage ways and other parts of the machine from contact with the grinding emulsion. lThese guards are simply and eiiiciently designed to conform to the contours of the machine, to extend adequately over the surface to be covered as the wheel spindle carriage is moved away along its slide, and to collapse readily into a small space as the carriage is returned toits limiting position at the near end of the slide.

The several features of the invention will be readily understood by one skilled in the art from the following description taken in connection with the accompanying drawings in which Fig. l is a view in right side elevation of the machine, only so much thereof being shown as is necessary to show the connection of the present invention there.

with; Fig. 2 is a more detailed view taken in left side elevation on a large scale; and Fig. 3 is a similar view in right elevation on a large scale.

For a more complete disclosure of the machine, and for a complete description thereof, reference may be had to the inventors pending application, Serial No. 206,917, filed July 19, 1927, of which the present application is a division.

Referring to the drawings, the machine illustrated comprises a frame 12 on the front portion of which is mounted a work supporting table 14, which is adapted for transverse movement on ways 16, and is provided with a head stock 18, and a foot stock. A rotary grinding wheel is indicated at 22, secured to a. wheel spindle 24 0n the wheel spindle carriage 26, which is mounted on ways 28 on the rear portion of the frame to slide towards and away from the work. The grinding wheel spindle 24; is driven from a drive shaft 30 mounted in the base of the machine by means of a belt 32 which passes over a pulley 34 on the wheel spindle 24 and under the idler pulley 36 and take-up pulley 38 in the base ofthe machine and around a pulley 40 on the drive shaft 80. An electric motor 42 acting through a belt 4:4 supplies the driving impct-us to the drive shaft 30. A water trough 46 is formed in the machine frame 12 between the' work support and the wheel spindle carriage to drain off the water which is continuously poured over the work during the grinding operation.

In grinding metal surfaces with grinding wheels having high peripheral speeds, it is necessary to keep a. continual flow of water, or some grinding emulsion, on the point of contact between the metal and the grinding surface to prevent overheating of the parts and to insure a smooth and efficient abrading actlon. In order to Conserv( the use of this water or grinding emulsion, a water trough is formed in the machine frame 12 between the work supporting table 14 and the wheel spindle carriage 26 to collect and draw olf the emulsion. Due to the corrosive action of the water, and more particularly of ingredients such as caustic soda in the grinding emulsion on the highly polished operating portions of the machinery, and due to the injurious effects of the water or emulsion on the oil film protecting the bearing surfaces in the machine, it has been found necessary to shield very carefully the various portions ofthe machine which are likely to come in contact with the emulsion. It is of the greatest importance to protect adequately the bearing surfaces of the ways 16 and 28 on which the work supporting carriage and the wheel spindle carriage are respectively mounted to slide. To this end, a laterally and upwardly extending slot 48 is provided on each side of the work supporting table 14 and is adapted to receive a corresponding flange or late 50 formed on corresponding portions of the frame 12 adjacent to the ways 16. In this manner, any sputtering of water or emulsion is effectively prevented from vreaching any of-the operating parts of the machine. located within or beneath the work supporting table. Y Y Y In order to protect the ways 28 for the wheel spindle carriage 26 and other operatthese guards being, so designed that they fold up into a comparatively small compass as the wheel s indle nears the end of its travel in either` 'rection.

With the present construction of the machine, which includes a passageway for the lubricating medium and a housing for the cross feed screw, it has been found impracticable to provide a single ard member to protect the forward end o theways, since such a member would necessarily be comparatively large, and would extend well into the water trough as the wheel spindle carriage reaches the limit of its forward move ment, bringing the guardrinto interference with the housings for the feed screw and oil conduit.

In carrying out the several features of the.

present invention, a comparatively short upwardly extending guard 52, which extends laterally of the machine across the width of the wheel spindle carriage, is pivoted at 54 on the machine frame 12, and is adapted to rest against the forward ends of the ways 28 for lthe'iivheel spindle carriage. Overlying the guard 52 is a second guard 56 which is hung rom pivots 58 formed on the wheel spindle carriage 26. With the wheel spindle carriage in its foremost position, in Contact with the work, the guard 56, as best shown in Fig. 1, extends downwardly to a point substantially opposite the pivot 54 of the guard 52, just above the trough 46. The edges of the guard 56 are turned over to give additional protection to the exposed machine parts. A tension spring 60, secured at one end of a pin 62 on the machine frame and at its other end being attached to the turned over edge of the guard 56, tends to holdthe guard yieldingly in contact with the end guard 52 and to hold the two guards against the ways 28. Adequate protection is provided for the rear end of thev ways 28 by a single guard 64 which is pivoted at 66 to the rear end of the wheel spindle carriage 26 and is slidingly supported on the fixed portion ofthe machine by the engagement of the turned over edges of the guard with rolls 68 mounted on each side o the machine base.

With the grinding wheel spindle carriage retracted to the limit of its movement away from the work, the rear guard 64 willbe permitted to hang in a substantially vertical position as its pivotal support 66 is moved to the rear of the rolls 68. The guards 52 and 56 at this time will occupy an 4extended position, the guard 56 which is carried rearwardly with the carriage 26 being held tightly against the upper edge of the ower guide 52 resting on the forward ends of the ways 28 by means of the tension spring 60. As the wheel spindle carriage is advanced during the grinding operation, the rear guard 64- will be drawn forwardly with the carriage being supported on the rolls 68. As the pivot 58 for the forward guard 56 is advanced, the guard is held at all times in contact with the lower guard 52 by the pressure of the spring 60. In the most advanced position of` t e carriage, as shown in Fig. 2 of the drawings, the lower guard 52 has been swung forward beyond center by engagement with the projecting-portions of the wheel spindle carriage 26 and rests yieldingly against the upper guard 56 which is held in its limiting vertical position by the spring 60.

The invention having been described, what is claimed is:

1. A. grinding machine having, in combination, a work table, -a grinding wheel a wheel spindle carriage, a water trough tween the table and carriage, a bed provided with ways for the carriage andguards to prevent the water from coming in contact with the ways comprising a guard pivotally mounted on the machine frame adjacent the edge of the water trough, and a guard overlapping therewith in all positions of the carriage pivotally mounted on the carriage.

2. A grinding machine having, in combination, a work table, a grinding wheel, a wheel spindle carriage, a water trough between the table and carriage, a bed provided with ways for the carriage and guards to prevent the water from coming in contact with the ways comprising a guard pivotally mounted onl the Ways et one end of the carriage, and a. guard pivotally mounted on the carriage and 'projecting over the 'ways at the other end of the carriage.

ft grinding machine having, in combinntion, e `Work table, e inding wheel, a 'wheel spindle carriage9 a d provided with tor the carriage, o, water trough between the table .endl the carriage, and guards mit to )prevent the Water from coming in eontact with the Ways and underlying parts comprising; n, guard extending iaterall of the maonine ncross the torward end o the carriage "oirotntty mounted on the machine frame ndi Woont the enige oi the Water trough and snp- `porter-i. in n substantially upright position niinst ndjncent portions ot the machine, :a ignoro! orertnpping therewith in eti the po :ions ot the carriage pvotelty mounted on the carriage, and spring means acting on the tntter guardi to hold the guards yieltin 1y :in `eozntnot with each other and with underying portions ontm the machine.

tn testimony whereof I have signed my onine to this. s ecieation..

Mn WELL i. MATHEWSON

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