US1388182A

US1388182A - Grinding-machine

Info

Publication number: US1388182A
Application number: US342912A
Authority: US
Inventors: Bengt M W Hanson
Original assignee: Individual
Current assignee: Individual
Priority date: 1919-12-06
Filing date: 1919-12-06
Publication date: 1921-08-23
Anticipated expiration: 1938-08-23

Description

B. M. w. HANSON. GRINDING MACHINE.

' APPLICATION FILED DEC. 6,1919.

Patented Aug. 23, 1921.

2 SHEETS-SHEET 1.

3144mm tor,

BEG-'1.- M. W. HANSON, 0F HARTFORD, CONIN'IEC'J.IiC'lIT'JJ.

GRINDING-MACHINE.

Y Specification of Letters Patent.

Patented Aug. 23, 1921.

Application 'flledi'beceniber 6,1919. Serial No. 342,912.

To all whom it may concern:

Be it known that I, BENGT M. W. HAN- SON, a citizen of the'United- States, and a resident of Hartford, county of Hartford,

State of Connecticut, have invented certain new and useful "Improvements in Grinding- Machines, of which the following is a specification.-

The purpose of this invention is to so organize the parts of a grinding machine that finish grinding operations may be carried out with the greatest accuracy so that the work when it comes from the machine,

will be in condition for use without the news sity of any further finishing operations.

This result is obtained by a proper sup-port of the moving parts so that they will always be maintained in proper position and relagtion to one another. This is of particular importance in certain classes of work, such for instance as the grinding of ball races, the embodiment of the invention which is here selected for illustration and description, for in such cases the ball race itself must be rotated on its own axis so as to present the full circumference of the raceto the action of the grinding wheel which rotates and the race must also be rocked or oscillated across the grinding wheel so that the full width of the race will be presented to the wheel. These movements of the race, which are brought about by suitable mechanism, must be smooth and regular and free from any vibration or other-1nfiuences tending to give an irregular motion which might-result from the driving mecha. nism which actuates the holder for the ball race. A further object of the invention is to provide a machine with certain adjustments in order that it may be adapted to different classes of work; for instance, the grinding of different type of ball races. It is to be understood that while the invention is illustrated and described as incorporated in a machine for grinding ball races, it is adapted for other work.

In the drawings I Figure 1 is a side elevation of so much of a grinding machine'as is necessary to illustrate the invention, some parts being shown in section. l

Fig. 2is a plan view of the work holder, partly shown in section.

Fig. 3 is a igiew similar to Fig. 2 but with the parts adjusted for operation on a different type of race from that shown in Fig. 2.

Fig. 4 is a plan view taken substantially on the line 4-4 of Fig. 1 showing the oscillating means for the work holder, and

Fig. 5 is a sectional plan view on the line 5-5 of Fig. 1.

Referring to the drawings, a denotes what may be considered the frame of the machine on which is mounted a carriage b for the support of the grinding wheel shaft 0, the grinding wheel being indicated at d. The carriage b, of any suitable construction, may

be adjusted upon the frame in any desired manner, nospecific means for accomplishing this result being shown, as the particular construction thereof is immaterial. e denotes generally the work holder mechanism which is mounted at the top of, a vertical shaft 7 which has on its lower end a segment gear 9 meshing with a corresponding segment gear h on a crank lever Z connected by a link m to an eccentric a driven in any suitable manner.

The complete work holder e is supported in the following manner. Mounted on the frame of the machine is an upstandin conical bearing member 5. Fitting onto this upstanding conical bearing member 5 is a complementary conically recessed bearing member 6 and this bearing member 6 carries the work holder e and is attached to the shaft 7. In the upper part of the work holder 0 is a conical recess to receive a conical steadying bearing 7 carried in a fixed part8 of the machine. a i

- By reference to Figs. 2 and 3, it will be seen that it is necessary to oscillate the work holder in a horizontal plane in order to present the full width of the groove of the race to the grinding wheel and this oscillation is brought'about by an oscillating move-' ment of the shaft f which-is secured in the -manner hereinabove set forth through the eccentric 1, link we and segmental gears .g, h.

In order to insure that the work holder shall have a smooth and regular oscillation, free from vibration incident to the actuation of the shaft f, this shaft is made in three sections, 10, 10? and 10". lhe lower section 10 is mounted in a long bearing 11 on the frame of the machine. The upper section 10 is connected with the recessed conical bearing member 6 as hereinabove set forth. The intermediate section 10 is not supported in bearings on the machine frame but is connected at its upper and lower ends to the upper and lower sections in the following manlarly of too nor. At the upper end of the lower section radial arms 18 corresponding in number to the radial arms of the sleeve 15.

By reference to Fig. 5, it will be seen that the radial arms at the adjacent ends of the shaft sections are staggered with relation to one another and between and connected to these radial arms there is positioned a fiexible disk 20. @f course, there is a similar connection between each end of the intermediate shaft section and. the adjacent ends of the upper and lower shaft sections. lit will be apparent that while these flexible connec tions will transmit the rotary motion from one shaft section another,- any flexure or distortion of one shaft member and particul lower section which directly re" ceives the driving impulse will not be transmitted to the other shaft sections. suit is that any cramping of the lower shaft section in its beariior any wearof the hearing which might allow for play will not transmitted through the intermediate shaft section and the flexible connections or couplings to the upper shaft section and so the work holder and since this work holder is supported on a bearing of liberal size and is accurately centered and steadied by the top bearing, a smooth and regular movement of the work holder is insured, This means that as the work holder is oscillated to move the race across the wheel, an accurate and smoot nnished surface is produced, free from any unevenness which would result if means were not employed for dampening or eliminating the vibration of the work holder.

It is, of course, apparent that in grinding a ball race, the oscillating motion shall talze place about that center from which the'transverse curve of the race is originated. in the case of the race shown in Fig. 2, the trans verse curve of the race is struck from the center of the bearing and, consequently, the chuck which holds the bearing must be so adjusted on the work holder that the center of the transverse curvature of the hearing shall be coincident with the axis of the shaft or more properly the axes of the alined bearings 5 and 8. ln the case of the ball race shown in Fig. 3, where the transverse curvature of the race is struck from the corn ter 2:, indicated by the cross lines, the chuck in which the race is mounted must be moved so that this center shall be coincident with the axis of the bearing 5. In order to provide for such adjustments'of the chuck to make the machine of more or less universal The re 3 applicability, the chuck 30 is mounted in a carrier 31 which slides on a gib '82 on the work holder head 33, a clamp 34; being provided to secure this carrier in any position of adjustment. The chuck spindle has a pulley 35 to receive a driving belt. It is of course understood that after the carrier 31 is properly adjusted, the carriage i) is adjusted to bring the grinding wheel into enga ement with the race.

nile the form of the device herein shown and described is admirably adapted to fulfil the objects of the invention, it is to be understood that it is not intended to confine the invention to this embodiment, as it is susceptible of embodiment in various forms all coming within the scope of the claims which follow.

I claim as my invention 3- l. in a grinding m chine, an oscillating work holder, a bearing supporting said holder, oscillating mechanism, and flexible shaft forming a connection between work holder and oscillatingmechanism.

2. i. a grinding machine, an oscillating work holder, a bearing supporting said worlr holder, oscillating means, a shaft extending through hearing and forming COHI16C- tion between said holder and oscillating mechanism, said having a section connected to said osci-lla mechanism, a section connected to said work holder, an intermediate section there-between and flexible connections between said sections, and a bearing for supporting the first mentioned section.

3. a grinding machine, an oscillating" work holder, a foot bearing and an overhead bearing supporting work ler, oscillating mechanism, a... flexible forno= 7 inga connection between said work l'ioldcr and oscillating mechanism.

61-. in a finding raachine, oscillating head, a carrier adjustable on said head transversely to the of oscil ation there in said carof, a chuck rotatably mounted rier, a foot bearing an overhead bearing between which oscillating head is supported.

5. in a grinding machine, an oscillating head, a foot bearing and an overhead bear ing between which said head is supported, a carrier adjustable on head right gles to the axis about which the'sa'nie oscillates, a chuck rotatably mounted in said connected alined sections with the upper section extending through said bearing and connected to said holder.

7. In a grinding machine, an oscillating Work holder, a foot bearing and an 'overhead bearing supporting said Work holder, a shaft comprising a plurality of flexibly connectedalined sections with the upper section extending through said foot bearing and connected to said holder, and oscillating mechanism connected to said shaft.

8. In a grinding machine, an oscillating head, a chuck rotatably mounted on said head, a foot bearing and an overhead bearing between which said oscillating head is supported.

9. In a grinding machine, an oscillating head, a foot bearing and an overhead bearing between which said head is supported, a chuck rotatably mounted in said head, a grinding wheel relatively adjustable at right angles to the axis about which the head oscillates, oscillating means, and a flexible shaft forming a connection between said oscillating means and head.

BENGT M. W. HANSON.