US1595287A - Polishing or like machine - Google Patents

Description

Aug. 10,1926. ,4 1,595,281 W. D. BUSS POLISHING OR LIKE MACHINE Filed June 15, 1924 2 SheetsSheet Qwuenliop I Au 10 1926. v 15951587 w. D. BUSs POLISHING 0R LIKE MACHINE Filed June 13, 1924 2 Sneets-Sheei 2 Patented Aug. 10, 1926.

U mTEn STATES PATENT OFFICE.

WILLIAM D. BUSS, OF CLEVELAND, OHIO, .ASSIGNOR TO THE HAMMOND MANUFACTUR- IN G COMPANY, OF CLEVELAND, OHIO, A CORPORATION OF OHIO.

POLISHING 0R LIKE MACHINE.

Application filed June 13, 1924.. Serial no. 719,777. 7

This invention relates to improvements in polishing and like machines particularly of the type embodying an operating motor and one or more individually controlled shafts "driven thereby and upon which the polishing or grinding disks may be removably' mounted; In the present case, two aligned separate shafts are shown as having driving connection with a continuously running electric motor and separate control means are provided for starting and stop ping each shaft.

One object of this invention is to provide braking means for promptlystopping rotation of either shaft whenfreed from its motor drive, so as to prevent idling of the shaft. "This braking means is 'operatively connected with the control means for the driving connection between the motor and shaft so that when the driving connection is rendered ineffective the braking means becomes efiective; and when the driving con nection is effected, the braking action is relieved. V

Another object is to provide means for positively and at will locking each shaft against rotation so as to facilitate-the re moval and exchange or renewal of the polishing or grinding disks.

A further object of this invention is to provide one means for controlling both the driving connection and the locking means in such a manner that if the driving connection is rendered ineffective the locking means is advanced toward locking position and locking action can then readily be effected by slight further movement after the shaft has been brought to rest.

This invention comprises also'the provision of a single actuating or control means for the driving connection, the braking means and the locking means, all of which therefore operate in harmonious relation with each other. e

Other objects will appear from the following description and claims when considered with the accompanying drawing.

Fig. 1 shows my improved device in front elevation with part of the casing broken away and parts in section; Fig. 2 is an end view with part of the casing broken away and other parts in section; Flg. 3 is a detail sectional view taken on line 3-3 ofFig. 2; and Fig. 4 is a similar view of a modification. 1

Enclosed within the casing 1 is the elec tric motor 2 which is provided on both ends of its rotor shaft with driving pulleys 3 the belts 4 of which extend around the driven pulleys 5 fixed upon the separate shafts 6 in the upper part of thecasing. Both ends slip and thereby prevent driving relation be-.

tween themotor and the shaft when desired. This slack may be taken up at will by means of an idle pulley 10 on an arm 11 rockably mounted in' a wall of the casing and controlled by a lever arm 12 on the outside of the casing. The belt is shown in slack or idle condition in Fig. 2, but upon movement of the lever arm 12 to the right, pulley l0 tightens the belt and thereby effects driving relation between the motor and shaft 6. Lever arm 12 may be held in any position to which it is moved by the pawl 13 actuated by lever; 14: and yieldably engaged with the notched segment 13 wall.

When pulley 10 is moved away from the belt the shaft 6 will continue to run idly until friction brings it torest. To bring it to rest promptly I have provided a brake 15 the resilient lining 16 of which is adapted to engage the drum 15 on shaft 6., Brake 15 is mounted upon the upper end of a rod 17 working in a barrel 18 against compression spring 21 and having a guiding pin 19 working in the slot 20 to provide lost motion and prevent relative rotation between rod and barrel. The lower end of the barrel 18 has pivotal connection at 23 with the arm 24,0n shaft 25 of the army 12. These parts are so constructed and arranged that upon movement of the lever 12 to the right, Fig. 2, for effecting driving relation between the motor and shaft 6 the brake is simultaneously rendered ineffective by downward movement of the cylinder 18 which drags the rod 17 downwardly therewith by the pin andslot connection therebetween.

Lever arm 12 may also be provided with a mounted on the casing 1 looking or latching pin 26 held by a spring 27 against the side'of segment 1 3 which is provided with recess or opening 28 adapted to receive a. manually releasable pin 26 to maintain the lever arm 12 in any predetermined position. corresponding to the effective position of the brake. Pin 26 of course may be readily released from its locking position by pulling the same outwardly against the tension of the spring 27.

Means are also provided for temporarily locking shaft 6 against rotation to maintain it in fixed position while the polishing disks are removed and renewed or eX- changed. The same drum 15 which is engaged by the brake shoe, is provided with a plurality of radially extending openings 29', four being here shown arranged at 90. These openings are adapted to receive the upper end of a pin 30 which is fixedly secured by a strap 31 to the upper end of cylinder 18 and is guided by a bracket 33 on the casing wall. Pin 30 also extends through a side portion 3 1 of the brake shoe 15. Upon upward movement of the cylinder 18, the rod 30 is also moved upwardly into engagement with one of the openings 29' in the manner and for the purpose now to be explained.

ALE; above stated, the parts as shown in the present illustration are in idle position; that is, driving relation between the motor and shaft 6 is broken. The brake is fully applied to the brake drum to bring shaft 6 to rest, and pin 30 is in engagement with one of the openings 29 to hold' or look shaft 6 against rotation in either direction. hen the driving relation is again established be tween the motor and shaft 6, the pulley 10 takes up the belt slack and lever 12 occupies a position to the right of that illustrated in ldig. 2. Also, the brake shoe is away from the brake drum and pin 30 is out of engagement with the opening 29. W hen it is desirel to stop operation of the shaft 6 for any purpose. the lever 12 is moved to the left to bring the pin 26 into engagement with a recess 28. such movement being sufiicient to permit the belt to become slack and ineffective and also to move the cylinder 18 upwardly. Spring 21 is confined in cylinder 18 with some inherent compression and. as soon as the upper end of slot 20 leaves the pin 19 the full compression effect of spring 21 is applied through the brake to the brake drum, bringing shaft 6 to rest before the upper end of rod. 30 reaches the drum.

Whenever the operator desires to tem- ,porarily lock the shaft against rotation,

re moves the lever 12 farther to the left, Fig. 2, until thepin 26 snaps into a second recess 28% such further operation causing stem 30' to enter one of the openings 29 which in the meantime has been brought into proper registering position by mantially turning the shaft 6'. After exchange or renewal of the polishing or grinding disks, the machine may be set irto operation by withdrawing the pin 26 from the recess 28 and moving lever 12 to the right to effect the driving relation between the motor and shaft 6'. Simultaneously pin 30 is withdrawn from the opening 29 and the brake shoe is relieved from engagement with the drum so that shaft 6is at once driven. Such manipulation 'of' lever 12 movesv the cylinder 18 downwardly permitting spring 21 to expand and move pin 19 to the upper end of the slot 20 andposit'ively lowers the brake-shoe away from the brake drum; Lever 12 is then held in its right-handposition by the pawl 13.

In Fig. 1 I have shown a modified form of locking means for lever 12. Herev I have provided recesses 35 and 35" which are adapted to'receive the tapered end of a yielding pin 36. The handle 12 is moved to the right or to the left, as they case. may

e, whereupon the tapered nose. of the pin rides up out of the tapered depression or seat. instead of a separate pin 36 and spring 3'7, the lever arm may itself be formed with an integralprojection and the lever arm may be sufii'ciently resilient that such projection may be snappedinto and out of such depressions: or seats in the same manner as just now described.

W hat I claim is:

1. In a machine of the class described,

the combination of a rotatable shaft, operative means for said shaft, disconncetible operative connecting means between said operating means and shaft, brakingmeans for aid shaft, a single control-ling means for said connecting means and braking means, and means for holding said controlling means in any adjusted position.

2.1a a machine of the class described, the combination of a rotatable shaft, oper ating means therefor, disconnectible operative connecting means between said operaating means and said shaft.v braking means for said shaft, controlling means for said connecting means and said braking means, and means for automatically holding said controlling means in any adjusted position.

3.111 a machine of the class described, the combination of a rotatable shaft, means for remo'vablv securing an attachment to said shaft, means for operating said shaft, and means for temporarily locking said shaft against rotation in both directions so as to facilitate the connection or disconnection ofsaid attachment.

1. in a machine of the class described, the combination of a rotatable shaft structure having an opening therein. means for removably securing an attachment to said shaft structure, and means adapted to en the combination of rotatable shaft, means for removabiy securing an attachment to sa'd shaft, meai s for operating said shaft, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said a tachment, and means for actuating said locking means upon stopping of said shaft and for releasthe same upon starting of the shaft.

7. In a machine of the class described, the combination of rotatable shaft, means for removably securing an a tachment to said shaft means for operating sai-c shaft, controlling means for rendering said operating means effective or ineffective, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, and a single means for actuating said controlling means and said locking means.

8. In a. machine of the class described, the combination of a rotatable shaft, means for removably securing an attachment to said shaft, means for operating said shaft, controlling means for rendering said operating means effective or ineffective, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, and means for simultaneously actuating said controlling means and said locking means.

9. In a machine of the class described, the combination of a rotatable shaft, disconnectible operating means therefor, braking means for said shaft, means for removably securing an attachment to said shaft, means for temporarily locking said shaft against rotation so as to facilitate the con nection or disconnection of said attachment, and means for simultaneously actuating said braking means and said locking means.

10. In a machine of the class described, the combination of a rotatable shaft, means for removably securing an attachment to said shaft, means for operating said shaft, controlling means for rendering said operating means effective or ineffective, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, a braking means for said shaft, and means for simultaneously actuating said controlling means,

said braking means and said locking means.

11. Ina machine of the class described, the combination of a rotatable shaft, operating means therefor, braking means for said shaft, means for removably securing an attachment to said shaft, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, means for actuating said braking means and said locking means, and means for maintaining said actuating means in two positions, in one of which positions said braking means is effective and said locking means is ineffective, and in the other of said positions said looking means is effective.

12. In a machine of the class described, the combination of a rotatable shaft, operating means therefor, braking means for said shaft, means for removably securing an attachment to said shaft, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, a single actuating means for said braking means and locking means, and said braking means including a yieldable part, whereby said locking means may be applied after application of said braking means.

13. In a machine of the class described, the combination of a rotatable shaft, operating means therefor, braking means for said shaft, means for removably securing an attachment to said shaft, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, said shaft being provided with portions adapted for engagement by said braking means and looking means, respectively, actuating means for effecting engagement of said braking means and locking means with their respective portion, and a yieldable connection between said braking means and said actuating means, whereby said braking means may be applied gradually.

14. In a machine of the class described, the combination of a rotatable shaft, operating means therefor, braking means for said shaft, means forremovably securing an attachment to said shaft, means for temporarily locking said shaft against rotation so as to facilitate the connection or disconnection of said attachment, a single actuating means for said braking means and loclc ing means, and spring and pin-and-slotconnection between said braking means and actuating. means.

In testimony whereof I hereby aflix my signature.

WILLIAM 1)., Boss.

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