US1888480A

US1888480A - Universal drive for grinding machines and the like

Info

Publication number: US1888480A
Application number: US516653A
Authority: US
Inventors: Storm Adolph; Thorsen Thor
Original assignee: STORM Manufacturing CO Inc
Current assignee: STORM Manufacturing CO Inc
Priority date: 1931-02-18
Filing date: 1931-02-18
Publication date: 1932-11-22
Anticipated expiration: 1949-11-22

Description

NOV. 22, 1932. I ET AL 1,888,480

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18, 1931 5 Sheets-Sheet l Nov. 22, 1932. M ET AL 1,888,480

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18. 1931 s Sheets-Sheet 2 IFJJII Nov. 22, 1932. A. STORM ET AL 1,888,488

UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Filed Feb. 18. 1931 a SheetsSheet 5 Patented Nov. 22, 1932 UNITED STATES PATENT OFFICE ADOLPH STORM AND THOR THORSEN, OF MINNEAPOLIS, MINNESOTA, ASSIGNORS TO STORM MANUFACTURING 00., INC., OF MINNEAPOLIS, LIINNESOTA, A CORPORATION OF MINNESOTA UNIVERSAL DRIVE FOR GRINDING MACHINES AND THE LIKE Application filed February 18, 1931. Serial No.-51 6,653.

Our present invention relates to grinding machines and the like and has for its object the provision of a highly efiicient universal drive for the grinding or other cutting wheel thereof, together with a novel support for said machine.

The invention, in part, is a division of our pending United States application for patent for piston turning and grinding machine, filed March 21st, 1930, under Serial Number 437,741. 7 I

Generally stated, the invention consists of the novel devices and combinations of devices hereinafter described and defined in the claims.

In the accompanying drawings; which illustrate the invention, like characters indicate like parts throughout the several views.

Referring to the drawings:

Fig. 1- is a rear perspective view of a piston turning and grinding machine in which the invention is embodied; I

Fig. 2 is a bottom plan view of the base;

Fig. 3 is a rear elevation of the universal drive, some parts being removed, and fraga mentarily illustrating the base on which said drive is mounted;

Fig. 4 is an elevation of the parts shown in Fig. 3; i

Fig. 5 is a fragmentary perspective view of the upper end portion of the rocker arm;

Fig. 6 is a fragmentary view, partly in elevation and partly in horizontal section, taken substantially on the line 66 of Fig. 1, on an enlarged scale;

Fig. 7 is a view principally in plan with some parts sectioned on the line 77 of Fig. 6; and

Fig. 8 is a fragmentary detailview, partly in elevation and partly in section, taken on the line 88 of Fig. 6, on an enlarged scale.

The invention, as shown, is embodied in a piston turning and grinding machine of the type disclosed and fully described and claimed in the'application heretofore identified. Of the parts of thismachine, it is important to note the base 9, bed 10, headstock 11, tailstock 12, carriage 13 mounted for reciprocatory movement on a pair of ways 14, which extend parallel to the axes of said headstock and tailstock, and a cross slide 15 mounted on the carriage 13 for rec'iprocatory movement transversally of said axes. The manually operated feed for the cross slide 15 is indicated as an entirety by the numeral 16. The base 9 has a novel support as will presently appear. v c

A semifinished piston X is held by the centers of the headstock 11 and tailstock 12. On the front end of the cross slide 15 is a tool rest 17 in which is mounted a cutting tool 18. Mounted on the rear end portion of the cross slide 15 is a grinder head 19, secured for bodily adjustment toward or from the tool holder)1( by a clamping connection 20 (see Fig. 6

An emery, or other cutting wheel 21, is mounted on the left hand end of a spindle 22, which extends parallel to the axes of the headstock 11 and tailstock 12 and is journaled in a pair of axially spaced bearings 23 on the grinder head 19. A relatively small pulley 24 is keyed to the spindle 22 between the bearings 23 (see Fig. 7), which is driven at a high rate of speed as willpresently appear.

By reference to Fig. 1 it will be noted that the cutting tool 18 is forward of the piston X, and the grinding wheel 21 is rearward thereof and spaced so that said cutting tools may be alternately brought into action on the piston at opposite sides thereof by reciproeating the cross slid-e 15. r

The mounting of the base 9, heretofore referred to, includes three flat feet 25 on the under side of said base for three point contact with the floor. Two of these feet 25 are at the front corners of the base 9, and the other is at the back thereof. The two front feet 25 are on a line that is parallel to the axes of the headstock 11 and tailstock 12, and said back foot is midway between the twofront feet 25.

The universal drive includes an electric motor 26, mounted in a cradle 27, with the axis of its rotor shaft 28 at right angles to the axis of the spindle 22. Said cradle 27 is pivoted at its endsto the ends of a U-shaped cradle support 29, and supports the motor 26 for rocking movement about a horizontal axis thereto by slot and bolt connections 40.

parallel to the direction of the travel of the carriage 13. This cradle support 29, in turn, is secured by a horizontal pivot pin to a bearing bracket 31 for rocking movement in the direction of the travel of the cross slide 15, and carries with it the cradle 27 and motor 26. The bearing bracket 31 is bolted to the base 29 directly over and substantially on the rear foot 25, so that the same is very close to the floor and a relatively long distance from the iston X.

T e grinding wheel 21 is driven from the motor 26 by a belt 32 which runs over a pulley 33 on the rear end of the rotor shaft 28 and the pulley 24. This belt 32, at its intermediate ortion, also runs over a pair of idle guide pu eys 34, which changes its direction of the travel so that the upper section of said belt extends substantially horizontally over the machine, and the lower section thereof is substantially vertical at the rear of the machine. These guide ulleys 34 also produce a fourth twist in said ower section of the belt.

The e pulleys 34 are 'ournaled, the one above t other, in pairs 0 bearings 35 on a pair of posts 86, formed with the upper end of'a heav upright rocker arm 37. It will be noted that one of the bearings 35 of each pair issecured to one of the posts 36 by a horizontal: ivot, and the other of said bearings is secure to the other of said posts by a slot and bolt connection 38. This mounting of the bearings 35 permits vertical angular adjustments of the guide pulleys 34 in respect to each other and transversally of the rotor shaft 28.

It will be further noted by reference to Fig. 5 that the left hand post 36 is inwardly ofiset for the ad'ustable bearing 35 of the upper guide pul y 34, and that the right hand post 36 1S inwardly offset for the pivot bearing of the lower guide pulley 34. These ofiset portions in the posts 36 hold the guide pulleys 34 horizontally angular in respect to each other. The above adjustments of the 'de pulleys 34 are important to cause the t 32 to run over the

pulleys

24 and 34 in pro r relation thereto.

ormed with the lower end of the rocker arm 37 is a yoke which straddles the motor 36 transversally of its rotor shaft 28 and the pro thereof are pivoted at 39 to the cradle 27. id prongs are further secured to the cradle 27 to rigidly connect the rocker arm 37 The connections 40 permit angular adjustment of the rocker arm 37 on the cradle 27 toward or from the machine. The purpose for thus adjustabl mounting the rocker arm 37 on the cradle 7 is to permit adjustment of the guide pulleys 34 over the pulley 33 for holding the sections of the belt 32 where they cross each other in proper relation to each other.

A link 41 connects the rocker arm 37 to the cross slide 15 and holds said rocker arm with theguide pulleys 34 a predetermined and constant distance from the pulley 24 so that the relation of the belt 32 to its pulleys is always the same. This link 41 extends longitudinally between the runs of the horizontal section of the belt 32, and on the front and rear ends thereof are

yokes

42 and 43, respectively. Said yoke 42 is connected to the link 41 by screw threads and a lock nut 44, and its prongs straddle the lower run of the belt 32 and are connected by horizontal pivots 45 to the grinder head 19. Obviously, by turning the yoke 42 about the axis of the link 41 the same may be longitudinally adjusted thereon to vary the operative length of said link, at will, and cause the same to act as a tightener for the belt 32. I

The rear yoke 43 is connected to the rocker arm 37 by a horizontal pivot 46 and to the link 41 by a flexible joint 47 which permits said yoke to turn about the longitudinal axis of the link 41 and move angularly in respect thereto. This joint 47 includes an anti-friction thrust bearing 48 and a compressed coil spring 49 which yield ngly holds the rocker arm 37 link 41, and thrust bearing 48 in assembled relation. The link 41 is knurled to facilitate the turning thereof in the front yoke 42.

During the traverse of the carriage 13, the link 41 moves the rocker arm arallel to the longitudinal axis of the wor to-wit: the piston X; and during the traverse of the slide 15, the link 41 moves the rocker arm 37 transversally of the longitudinal axis of said work. 7

Referring again to the three point support for the base 9, to-wit: the feet 25 and the mounting of the universal drive, the object thereof is to afford a firm support for the base 9, irrespective of any unevenness in the floor, and thereby prevent strains on said base that would tend to twist or throw the centers of the headstock 11 and tailstock 12 out of true axial alignment.

It is highly important to note that the support for the universal drive is directly over the rear foot 25 and close to the floor so that vibrations from said drive are transmitted to the floor rather than through the machine and universal drive to the work and centers.

From the foregoing it must be evident that the invent on herein disclosed is capable of lar e range of modification within the spirit oft e invention herein disclosed and claimed.

What we claim is:

1. In a machine of the class described, a headstock and a tailstock, a reciprocatory carriage between the headstock and the tailstock, a cross slide on'the carriage, a grinding wheel on the cross slide, a motor mounted for universal movement, and a universal drive from the motor to the grinding wheel.

2. In a machine of the class described, a headstock and a tailstock, a reciprocatory carriage between the headstock and the tailstock, a cross slide on the carriage, a grinder head mounted on the cross slide for adjust; ment longitudinally thereof, a grinding Wheel mounted on the grinder head, a motor mounted for universal movement, and a universal drive from the motor to the grinding Wheel.

3. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide, a cradle support mounted to rock in the direction of the travel of the cross slide, a

cradle mounted on the cradle support to rock in the direction of the travel of the carriage, a motor in the cradle, means actuated by the cross slide for rocking the cradle, and driving connections from the motor to the'grinding Wheel.

4. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide, a cradle support mounted to rock in the direction of the travel of the cross slide, a era dle mounted on the cradle support to rock in the direction of the travel of the carriage, a motor in the cradle, a fixed rocker arm on the cradle, a connection from the cross slide to the rock r arm, and driving connections from. the motor to the grinding Wheel carried in part by the rocker arm.

5. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide, a cradle support mounted to rock in the direction of the travel of the cross slide, a cradle mounted on the cradle support to rock in the direction of the travel of the carriage, a fixed rocker arm on the cradle, a link connecting the rocker arm to the cross slide, a motor in the cradle, and driving connections from the motor to the grinding wheel includ ing a belt and guide pulleys therefor on the rocker arm.

6. The structure defined in claim 5 in which the operative length of the link may be varied, at will, to tension the belt.

7 The structure defined in claim 5 in which the rocker arm is angularly adjustable in respect to the cradle and in the direction of the travel of the cross slide.

8. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide, a motor mounted for compound rocking movements in the direction of the travel. of the carriage and in the direction of the travel of the cross slide, and driving connections from the motor to the grinding Wheel.

9. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide, a motor mounted for compound rocking movements in the direction of the travel of the carriage and in the direction of the travel of the cross slide, a rocker arm fixed in respect to the motor and connected to the cross slide to impart rocking movements to the and the direction of the travel of the cross slide, the rotor shaft of the motor being substantially at right angles to the shaft of the grinding wheel, a pulley on the rotor shaft, a rocker arm fixed in respect to the motor and operated from the cross slide to impart the rocking movements to the motor, guide pulleys on the rocker arm, and a belt arranged to run over said pulleys.

11. The structure defined in claim 10 in which the axes of the guide pulleys are sub stantially parallel to the axis of the shaft of the grinding Wheel.

The structure defined in claim 10 in which the axes of the guide pulleys are substantially parallel to the axis of the shaft of the grinding Wheel and spaced longitudinally of the rocker arm.

18. The structure defined in claim 10 in which the rocker arm is angularly adjustable longitudinally of said rotor shaft.

14. In a machine of the class described, a reciprocatory carriage, a cross slide on the carriage, a grinding Wheel having a pulleyequipped shaft journaled on the cross slide and extending t-ransversally thereof, a motor mounted for compound rocking movements in the direction of the travel of the carriage and the direction of the travel of the cross slide, the rotor shaft of the motor being substantially at right angles to the shaft of the grinding Wheel, a pulley on the rotor shaft, 7

' an upright rockerarm fixed in respect to the motor, a. link connecting the rocker arm to the cross'slide, a pair of guide pulleys on the rocker arm spaced one above the link and the other below the same, and a belt arranged to run over said pulleys with the link extending longitudinally therebetween.

15. In a machine of the class described, a

reciprocatory carriage, a cross slide on the carriage, a grinding Wheel on the cross slide,

a motor mounted for compound rocking movements in the direction of the travel of the carriage and in the direction of the travel of the cross slide, a rocker arm fixed in respect to the motor, a link having a swiveled joint connecting the rocker arm to the cross slide,

and driving connections from the motor to the grinding Wheel.

16. In a machine of the class described, a base, a bed on the base, a headstock and a tailstock on the bed, a reciprocatory carriage on the bed between the headstock and the tailstock, across slide on the carriage, a grinding wheel on the cross slide, said base having three low supporting feet, a motor 5 mounted on the base directly over one of said feet for universal movement, and a uni versal drive from the motor to the grinding wheel.

17. In a machine of the class described, a base, a bed on the base, a headstock and a tailstock on the bed, a reciprocatory carriage on the bed between the headstock and the tailstock, a cross slide on the carriage, a grinding wheel on the cross slide, a motor mounted on the base rearward of the cross slide for universal movement and a universal drive from the motor to the grinding wheel; said base having three low supporting'feet, one of which is under the motor. 18. In a machine of the class described, a base, a bed on the base, a headstock and a tailstock on the bed, a reciprocatory carriage on the bed, a cross slide on the carriage, a grinding wheel on the cross slide, a motor 28 mounted on the base at the back thereof for universal movement, a universal drive from tlie motor to the grinding wheel, said base having three low supporting feet, one of which is under the motor, and the other two 30 of which are at the front of the base, and in a line substantially parallel to the axes of the headstock and the tailstock.

19. In a machine of the class described, a reciprocatory carriage, a cross slide on the 36 carriage, a grinding wheel on the cross slide, a motor mounted for compound rocking movements in the direction of the travel of the carriage and in the direction of the travel of the cross slide, a rocker arm fixed in respect 40 to the motor, a link having a universal joint connecting the rocker arm to the cross slide, and driving connections from the motor to the grinding wheel.

The structure defined in claim 10, in which the guide pulleys are angularly adjustable transversally of the axis of the rotor shaft, and in respect to each other.

In testimony whereof we aflix our signatures. ADOLPH STORM. THOR THORSEN.