US1449454A - Finger block for wedge mechanism - Google Patents

Description

Mar. 27, 1923.

1,449,454 0. A. SMITH Y FINGER BLOCK FOR WEDGE MECHANISM Filed Dec. 15, 1921 2 sheets-sheet l Mar. 27, 1923.

O. A. SMITH FINGER BLOCK FOR WEDGE MECHANISM Filed Dec. 15, 1921 Z w M m 05 car/Z SSW/7% Patented Mar. 27, 19233.

OSCAR A. SMITH, or EAST CLEVELAND, OHIO, Assrenoa 'ro NATIONAL Acmnooir- 1 PANY, or CLEVELAND, OHIO, A. oonrona'rron or OHIO. I

FINGER BLOCK FOR WEDGE MECHANISM.

Application filed December 15, 1921. Serial No. 522,512.

To all whom it mag concern:

Be it known that I, OSCAR A. SMITH, a

citizen of the United States, residing at East Cleveland, in the county of Cuyahoga 5 and State of Ohio, have invented certain new and useful Improvements in Finger Blocks for l/Vedge Mechanism, of which the following is a specification. a r

This invention relates to finger blocks or finger holding means for wedge mechanism on revolving spindles adapted preferably to operate in conjunction with automatically operative spring chucks or collets, an object of the invention being to provide im- 16 proved mechanism of this general character particularly designed and adapted to be used in metal working machines wherein an improved means is provided for positively preventing or resisting the tendency of the an operating fingers to spread through centrifugal force while the spindle is revolving during operation.

A further object. of this invention is to provide an improved mechanism of this character which will be more simple and compact in structure, eflicient and effective 1 in operation, and economical to manufacture.

Other objects of this invention will appear in the following description thereof, reference being had to the accompanying drawings forming a part'of this specification, wherein like reference characters indicate corresponding parts in the several views and wherein Fig. 1 is a side elevation partly broken away. illustrating my invention; Fig. 2 is a right hand end view thereof; Fig 3is a section taken substantially on lines v83 of Fig. 1 in the direction of the 40 arrow; Fig. 4 is a perspective view illustrating the fingerblock or holder and a finger pivot screw withdrawn therefrom; Fig 5 is adetail view of a finger; and Fig. 6 is a detail view illustrating the various parts of the lunger mechanism. H dretofore one of the main disadvantages residing in finger block mechanism was occasioned by the fact that upon shifting the wedge mechanism in order to release the fingers, and thereby permit the spring chucks or collets or the like to release themselves, the centrifugal force set up by the revolving spindle often 1 caused the fingers to spread. This spreading of the fingers interfered considerably with the efficiency or effective operation of the spring collet or chucking mechanism particularly, counteracting an effective opening or releasing of the collet or chuck.

Thus the purpose of the present invention is to do away with these disadvantages and particularly eliminate such impediment to the opening or release of the chucking mechanism arising heretofore from centrifugal force.

Referring to the drawings it will be seen that the usual wedge or cone shaped sleeve 10 is slidably mounted upon the spindle 9 and is adapted to be shifted in any suitable manner upon the spindle relatively to the finger block. In the present instance the inadvertent or accidental finger holding means or support comprises a finger block 12 adapted to be screwed onto the spindle9 or otherwise secured thereto, and provided at the rear end thereof withv a pair of diametrically opposed slots 13 and 14. Within each slot is pivotally mounted a finger or operating lever 15, pivoted by means of a pivot screw 17 inserted in suit able holes 16 tapped in the finger block at right angles to the slots 13 and 14:, the pivots 17 adapted to pass through pivot holes 19 in i the pair of fingers or operating levers. It will be noted that each finger 15 is provided at the rear end with a, thrust portion 20.

adapted to engage the rear end of the usual chucking tube (not shown) and to shift the same for the purpose of'operating the chuck as is well known in the art. At the forward end 21 each finger is constructed to cooperate with the tapered portion 11 of the Wedge.

In the rear or extended portion 18 of the finger holding means, a suitable distance away from the rearward face and at a suit able angle to thefinger or lever slots 13 and 14, is bored a pair of two'section holes or slots 22 and 23, extending in the same plane I and parallel to each other. These bores comprise portions or sections of enlarged di ameter terminating inportions 21 and 25 of reduced diameter. In these holes or bores are housed a pair of plungers 26, the headed portions thereof corresponding substantially ion to the large diameter of holes 22 and 23, and.

the stems thereof loosely fitting the small diameters 24 and 25 of the holes. In rear of and resting against the head of each pin 26 is housed in each hole a compression spring 27 the same being held firmly in position by means of a pair of adjusting screws 28 cooperating with the threaded portions 29 of the respective holes or slots. By adjusting these screws 28 it will be readily seen that the tenion of springs27 may beadjusted or varied as desired, thereby varying the pressure exerted by the plungers upon the operating fingers or levers.

Into the rearward face and preferably at a suitable distance above the pivoting holes '19 of the fingers, are milled stations or recesses 30. These recesses it will be noted form seats having the walls 31 thereof at right angles to the direction of operation of the plungers 26, and the walls 32 thereof in substantial parallel relation thereto. As a result the milled stations or seats are angularly formed to correspondto the angular position of the plungers, and the plungers 25 project through the slots 13 and 14 into "these stations or seats under constant pressure from the compression springs 27.

In operation it will be readily seen that when the automatic spring collet or chuck releases as a result of the shifting-of the wedge 10, soas to travel away from the finger block 12, the fingers 15 collapse as indicated in dotted lines in Fig. 1 by virtue of the outward lateral force exerted by the plungers in rear of pivots 17 upon the operating fingers. The fingers however will be positively held in this position against the centrifugal force of the revolving spindle due to the fact that the spring controlled plungers 26 exert continuous pressure upon the ends of thefingers thereby overcoming and'counter-acting the centrifugal force. This resistance to the spreading of the fingersj isincreaSed due to the fact that the fingers'have'a positive frictional engagement with the ends of the plungers. WVhen the inner ends are forced inwardly the walls or faces 31 slide over the ends of the plungers, which frictional contact together with the resistance of the springs forms a Very effective and positive resistance to the spreading of the fingers.

It will be further scen'that I have provided not only a mechanism for efiiciently controlling the position of the operating "fingers but I have also provided a compact structure wherein the finger controlling mechanism is mounted entirely within the finger block thereby resulting not only in more directness of operation but also in considerable simplification and economy in construction.

Although I have described my invention inits preferred form, it is tobe understood that I do not limit myself to the construction herein shown and described except in so far as defined in the claims and embraced within the scope thereof.

I claim as my invention:

1. The combination of a spindle, a finger holder carried thereby, a chuck operating finger pivotally carried bysaidfinger holder, means carried by the spindle 'for swinging said finger in one direction, and spring pressed means engaging the finger at the rear of its pivotal point for swinging the finger inthe opposite direction and operative in a direction transverse to the plane of movement of said finger.

2. The combination of a spindle, a finger holder carried thereby, a chuck operating finger pivotally carried by saidfinger holder, means carried by the spindle for swinging said finger in one direction, and spring pressed plunger means for swinging the finger in the opposite direction and operative in a direction transverse to the plane of movement of said finger. i

8. The combination of supporting means, a plurality of chuck operating fingers pivotally carried thereby, means for engaging the opposed faces of said fingers for swinging tl e fingers in one direction to spread them, and means positioned to have a movement transversely to the plane of swing of said fingers for frictionally and resiliently resisting such movement. i

4. The combination of supporting means, a plurality of chuck operating fingers pivotally carried thereby, means for'engaging the opposed faces of said fingers for swinging the fingers in one direction to spread them, and'means positioned to have a movementtransversely to the plane of swing of 'said fingers for frictionally and resiliently spring pressed plungers'.

'5. The combination of a spindle, a finger block adapted to be connected thereto, chuck operating fingers pivotally carried bysaid finger block, and a pair of means 'coacting with said fingers for swinging the same, said means being operative in different directions and having the axis thereof extending outside the axis ofthe spindle and in position to engage; the finger at the rear of its pivotal point, thereby to exert a pushing action thereon.

6. The combination of aspindle, a finger block adapted to be connected thereto, a chuck operating finger pivotally carried by said finger block, and meanscoacting with 'said finger for swinging thesame, said" adjacent to one end thereof to said holding means, and means for swinging the finger and having one end engaging said finger in rear of its pivot and the other end extend through said finger holding means and terminating adjacent to the exterior thereof.

8. The combination of a spindle, a finger holder carried thereby and having a pair of opposed slots, chuck operating fingers pivoted in said slots, and a pair of means coacting with said fingers and operative in different directions and located to exert a pushing action on and thereby swing said fingers, each of said means having the axis thereof extending outside the axis of the spindle.

9. The combination of a finger holder having a pair of opposed slots, chuck operating fingers pivoted in said slots, and means for swinging said fingers, said means extending through the finger holder from the outside thereof into engagement with said fingers.

10. The combination oi a spindle, finger supporting means mounted thereon, a chuck operating finger pivotally carried by said supporting means, and spring pressed means engaging the side of said finger for swinging the same.

11. The combination of a finger holder having a. pair of opposed slots, chuck operating fingers in said slots, and adjustable.

spring controlled means for swinging said fingers, said means extending through the finger holder from the outside thereof into engagement with said fin 'ers.

12. The combination of a rotary spindle, finger supporting means carried thereby, a chuck operating finger pivoted to said supporting means and swingable in the plane of the axis of said spindle, and an adjustable spring actuated plunger engaging the side face of said plunger for swinging the same.

13. The combination of a finger holder having a slot, a chuck opera-ting finger pivoted in said slot and having a recess in its side and a spring controlled plunger carried by said holder and projecting into said recess.

14. The combination of a finger holder, a

thereby and having at a side face thereof a plunger receiving seat and a plunger engaging said seat.

15. The combination of a finger holder, a chuck operating finger pivotally carried thereby and provided with a recess having angular walls, and a plunger projecting into said recess, said holder having a recess open at both ends for receiving said plunger.

16. The combination of a finger holder, a chuck operating finger pivoted thereto, and resilient means extending substantially through said holder for controlling the same.

17. A finger holder for chuck operating fingers having an axialslot and an angular hole communicating therewith and open at both ends.

18. The combination of supporting means, a plurality of fingers pivotally carried thereby, means for swinging said fingers in one direction, meansfor resisting such movement and comprising a plunger directly engaging each ofsaid fingers at an angle to the sides thereof, and resilient means cooperating with said plunger.

. 19. The combination of supporting means, a plurality of pivoted fingers carried thereby, wedglng means for engaging the opposed faces of the fingers at one end thereof thereby to spread. said ends, and means for engaging the fingers at the opposite ends thereof and located at an angle to the sides of the fingers for spreading the opposite ends of said fingers,

20. The combination of a spindle, finger supporting means mounted thereon, a chuck operating finger pivotally supported intermediate its length on said supporting means, means for engaging the finger at one side of its pivotal point for operatingthe finger in one direction, and means for engaging the finger at the other side of its pivotalpoint and located at an angle to the side of the finger for operating the finger in the opposite direction.

Signed at Cleveland, Ohio, this 12th day or December, 1921.

' OSCAR A. SMITH.

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