US705593A - Grinding and polishing machine. - Google Patents

Description

No. 705,593. Patented m 29, |902. c. MALDANER.

GRINDING AND POLISHING MACHINE.

(Application filed Aug. 19, 1901.)

(No Model.)

W/TNESSES IN VENTOH A TTORN E Y m: nonm's PETERS 00., Pnoroumu. WASHINGTON. n, c

UNITED STATES CHARLES MALDANER, OF CHICAGO ILLINOIS, ASSIGNOR TO CHICAGO HANDLE BAR CO., A CORPORATION OF ILLINOIS.

GRINDING AND POLISHING MACHINE.

SPECIFICATION forming part of Letters Application filed August 19, 1901.

.To aZZ whom, it may concern.-

Be it known that 1, CHARLES MALDANER, a citizen of the United States, and a resident of Chicago, county of Cook, and State of Illil nois, have invented certain new and useful Improvements in Grinding and Polislring Machines, of which the following is a specification and which are illustrated in the accompanying drawings, forming a part thereof.

My invention relates to certain improvements in machines for grinding and polishing hollow tubes, and has for its objects to improve and simplify such machines, primarily by dispensing with the complicated mechanism employed for feeding and turning the work during the grinding operation, the grinding wheels themselves being depended upon to give to the tube the necessary, rotation.

In machines of the character to which this invention appertains, employing a traveling mandrel, the tube has first to be sleeved upon the mandrel and secured in place and the whole then fed forward by a-feeding mechanism, the mandrel. being rotated, and thereby turning the tube, while the latter is having its surface acted uponby the grinding or polishing wheels. In practice this is a slow and laborious process, necessitating a waste of time in securing the'tube onto the mandrel and in feeding the, same 'to. the polishingwheels, and the results attained have not been generally satisfactory. Equally complicated and unsatisfactory is a machine having its polishing-wheels adapted to revolve about the tube or rod to be polished the latter being held against movement; and my invention has for its'aim to simplify the structure of such and other machines and to provide a machine designed to secure the best results in the most expeditious manner; and to this end it consists in providing a pair of grinding or polishing wheels adapted to be driven in the samedirection, so that their adjacent faces travel in opposite directions, and a stationary mandrel which projects forwardly and is centered between the two wheels for carrying thework, The tubing is slid on the mandrel and rotated by the wheels during the polishing operation, but being held by the hands of the operator, who exerts arelatent No. 705,593, dated July 29, 1902.

Serial No. 72,600. (No model.)

tarding influence thereon, it does not travel 'at the same rate of peripheral speed as the wheels which bear againstthe same, and consequently the surfaces of the tube are abraded or polished.

j The invention is illustrated in the accompanying drawings, in which- Figure 1 is a side elevation of a grinding and polishing machine constructed in accordance with my invention. Fig. 2 is a plan view of the same. Fig. 3 is a View, partially in section, of a modified form of mandrel or work-holding tool; and Fig. i is a longitudinal section of a piece of tubing having a closed end, such as the handle-bar stem of a bicycle, with which the mandrel shown in Fig. 3 is adapted to be employed.

I Mounted at each end of the bed-plate 10 of the table 11 of the machine are a pair of wheels 12 and 12, the former being provided with grinding or abrading surfaces while the latter are polishing or buffing wheels. There is no coaction between the two sets of wheels 12 and 12, each pair being designed to be employed independently of the other; but in practice I have found it convenient to mount the grinding or abradiug and polishing wheels on the same support, as illustrated. However, as the twopairs of wheels and the mechanism for driving the same are in all respects alike, I shall describebut one set. Each of the wheels 12 is fixed to'a shaft 13, journaled in the boxes 14 on the upright supports 14, motion being communicated to the shafts, and thereby the wheels, through the medium of belts 16, passing around the pulleys 15, keyed to the said shafts. The wheels are designed to be driven in the same direction, so that their adjacent faces travel in opposite directions. The supports 14* are carried by plates 17 which are adapted to slide on guide-plates 18, mounted on the table, the movement of the former being secured by the screw-rods 19, operated by the handwheels 20 in the usual manner. This arrangement provides for the adjustment of the wheels 12 and 12 to and from each other to adapt the machine to tubes of different sizes.

Mounted in supports 22 at each end of the bed-plate lOand held therein against move- IOU ment by set-screws 23 is a rod 21, carrying a bracket 24, which is fixed to the rod by a bolt 25 and has a pair of clamping-jaws 26 for securing and supporting, by means of a bolt 28, the removable mandrel or tube support 27, the end of which is pointed, as at 30, and projects beyond the wheels, so as to facilitate the sleeving of the tube thereon. The rod 21 is so disposed that the mandrel 27, by means of its support 24, may be properly adjusted between the grinding or polishing wheels. The rod 21, serving merely as a support for the mandrel-brackets, may give place to any other form of support that may be secured to the frame of the machine. An adjustable collar 29, mounted on the mandrel and held by a bolt 29, serves as a stop to limit the movement of the tube thereon, and for grinding or polishing an ordinary tube having open ends a mandrel consisting of a rigid bar will suffice, as the tube may be ground or polished at one end and then reversed on the mandrel to have its other end acted upon. When, however, it is desired to treat a tube having a closed end, such as illustrated in Fig. 4, so that the tube cannot be sleeved upon the mandrel from each end, I have provided an adjustable or yielding mandrel. (Seen in Fig. 3.) This comprises a tubular holder 31, carrying a telescopic mandrel 32, having an adjustable collar ,37. Extending from the end of the mandrel 32 into the tube and through the head 35 is a rod or extension 33, having a nut 36 on the end to limit the outward movement of the mandrel, and a coiled spring 34, reacting between the end of the mandrel and the head 35, maintains the mandrel normally outward or in such position that the nut 36 bears against the head 35, but permits the mandrel to slide into the tubular holder when required to do so by the work to be performed.

In operation,the wheels havingbeen spaced apart the proper distance, the tube to be abraded or polished is sleeved upon the mandrel 27 by hand and forced in between the wheels and acted upon by the same. The operator grasps the tubing, using gloves or pieces of cloth for protecting his hands, and it is turned by the action of the wheels; but because of its friction with the mandrel and the retarding influence of the hands of the operator the tube does not revolve with the same peripheral speed as the grinding-wheels, and hence, although it is turned sufficiently to present all its circumference to the grinding-surface, it is abraded by the action of the wheels, so as to give the necessary finish. The tube having been run between the wheels at one of its ends is then Withdrawn and the opposite end sleeved upon the mandrel, so that that end may be treated. When the tube has been put through the grinding process, it is carried to the other end of the table and the same operation is repeated with the polishing-wheels 12.

The mandrel 27 may be j ournaled in. the support 24 in such manner as to be capable of rotation, and in grinding or polishinga tube fitting the mandrel snugly or havinga rough interior such construction would be very desirable; otherwise the friction between the mandrel and the tube might be so great as to prevent the turning of the tube at all by the wheels. By making the mandrel capable of rotation the tube will always be free to turn under the action of the grinding or polishing wheels.

In surfacing a tube having a closed end, as illustrated in Fig. 4, the modified form of mandrel is employed. The tube is first sleeved upon the mandrel 32 and then passed between the wheels, as above, until the open end of the tube strikes the collar 37. Pressure on the tube, a suitable holding-tube being used, will then cause the mandrel to slide into the sleeve 31 against the resistance of the spring 34, and the tube may be ground or polished its entire length, or in case it has an enlargement, such as 38, until the collar 37, which has been previously properly adjusted, abuts against the end of the tubular holder or sleeve 31. When the tube is withdrawn from the yielding mandrel,the spring 34 forces the mandrel outward or into its normal position.

I claim as my invention- 1. In a tube-polishing machine, a pair of polishing-wheels mounted in a common plane and spaced apart to receive a tube between them, means for rotating the wheels in the same direction, and a mandrel projecting between the Wheels upon which the tube may slide and turn.

2. In a tube grinding and polishing machine, in combination, a pair of polishingwheels, means for rotating the wheels in the same direction, and a longitudinally-movable mandrel projecting between the wheels to receive a tube held in the hands of the operator.

3. In a tube grinding and polishing machine, in combination, a pair of adjustable polishing -wheels, means for rotating the wheels in the same direction, an adjustable bracket, a removable mandrel carried by the bracket and projecting between the wheelsto receive a tube held in the hands of the operator, and means for adjusting the wheels.

4. In a tube grinding and polishing machine, in combination, a supporting-table, a pair of polishing-wheels supported from the table and adapted to be so driven that their adjacent faces travel in opposite directions, a bracket, and a mandrel carried by the bracket and projecting between the wheels, the mandrel being designed to receiveatube held in the hands of the operator to be acted upon by the wheels.

5. In a tube grinding and polishing machine, in combination, a supporting-table, a pair of polishing-wheels adjustably supported from the table and adapted to be so driven that their adjacent faces travel in opposite directions, a bracket, and a mandrel carried by the bracket and projecting between the wheels, the mandrel being designed to receive a tube held in the hands of the operator to be acted upon by the Wheels.

6. In a tube grinding and polishing machine, in combination, a supporting-table, a pair of polishing-Wheels supported from the table and adapted to be so driven that their adjacent faces travel in opposite directions, a rod mounted on'the table, a bracket carried by the rod, and a mandrel held by the bracket and projecting between the wheels, the mandrel being designed to receive a tube held in the hands of the operator to be acted upon by the Wheels. l I

7. In a tube grinding and polishing machine, in combination, a supporting-table, a pair of polishing-wheels adj ustably supported from the table and adapted to be so driven that their adjacent faces travel in opposite directions, a bracket, and a mandrel held by the bracket and projecting between and extending beyond the wheels, the mandrel being designed to receive a tube held in the hands of the operator to be acted upon by the wheels.

8. In a tube-polishing machine, a pair of polishing-wheels mounted in a common plane and spaced apart to receive a tube between them, means for rotating the wheels in the same direction, and a telescopically-extensible mandrel projecting between the wheels upon which the tube may slide andturn.

9. In a tube grinding and polishing machine, in combination, a pair of polishingwheels adapted to be so driven that their adjacent faces travel in opposite directions, a bracket, and a yielding mandrel carried by the bracket and projecting between the wheels, the mandrel being designed to receive a tube held in the hands of the operator to be acted upon by the wheels.

10. In a tube grinding and polishing machine, in combination, a supporting-table, a pair of polishing-wheels supported from the table, means for rotating the wheels in the same direction, a bracket carried by the table, a tubular mandrel-holder held by the bracket, a mandrehhaving sliding engagement with the tubularholder, projecting between the wheels, anda spring located in the tubular holder and adapted to force the mandrel normally outward.

A CHARLES MALDANER.

Witnesses:

LoUIs K. GILLSON, ARTHUR B. SEIBOLD.

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