US1656624A - Hydraulic chuck - Google Patents

Description

Jan. 17; 192s.

E. FINSEN HYDRAULI C CHUCK Filed April 2 0. 1926 2 sheets-sheet 1 A MME-1259i; mynzNToRv ATTO EY Jan. 17:, 1928.

E. FINSEN HYDRAULIC CHUCK Filed April 2o. 1926 2 Sheets-Sheet 2' `I'nenaal Jain.` 17,1928. 1,656,624

UNITED STATES PATENT OFFICE.

kIETYVIND-IEIIN'SEBT, OF ROCHESTER, YORK, ASSIGNOB T0 GLEASON WORKS,y OF

ROCHESTER, NEW YORK, A. CORPORATION OF NEW YOBIK.

HYDRAULIC CHUCK.

` Application led April 20, 1928. Serial No. 103,868.

The present invention relates to chucks. in section, showing somewhat diagram- The primary object of this invention is lmatically one form of control device for to provide a chuck which may be readily controlling the operation of the chuck; and controlled and easily operated.

Further objects of the invention are to shown in Figure 7. provide a chucking mechanism which will securely retain an object during work there.- particularly, the provision of a chucking on, and which will automatically release the mechanism for machines operating upon object after the various operations thereon gears or gear blanks and it is in connection have been completed. with the blank supporting means of a gear A :further purpose of the-present invencutting machine that the present invention tion is the provision ot' a chucking mechais particularly disclosed. The speciiic purnism which may be controlled by fluid prespose of the invention is to provide means sure,'as it has been found that this medium which will prevent rotation or axial movepermits of a simple centralized control and ment of the blank on its spindle or arbor insures positive operation of the various during the operations thereon. The preparts at all times. l erred embodiment includes mechanism,

With the above and other objects in view, also, which automatically releases the blank the present invention resides in the novel after the completion of the required operaarrangement and combination of parts and tions thereon so thata new blank may be y in the details of construction hereinafter chucked.

described and claimed, it being specifically `Fi rel;

' preferred type of'c'lamp employed in secur- Referring to the drawings by numerals oi' understood that this invention is not limited reference, 5 indicates a support or housing to the particular "structure embodied in the which may be mounted in any Suitable manaccompanying drawing and specification but n er upon the frame or cradlesof a gear cutthat the structure may be modified Within ting machine. Rotatably mounted in the the scope of the invention and the limits of f housing 5 is a sleeve 6 with which is conthe appended claims. nected the indexing mechanism, indicated @ne embodiment of the invention is illusgenerally at 7, for indexing the blank. This trated in the accompanying drawings, in indexing mechanism may be of any suitable which: v character. That shown is that more par- Figure l is a side elevation, partly in secticularly described in the copending applition, of the blank support of a gear cutting cation of James E. Gleason et al., Serial N o.` machine, showing a chuck, constructed ac- A715,390, filed May 23, 1924. Mounted in the cording to this invention, employed thereon Sleeve 6 (Fig. 2)` iS a tubular member 8 and showing the chuck in inoperative posiwhich extends outwardly beyond the sleeve tion; l 6 andisl provided with an outer enlarged Figure 2 lis a partial sectional view on a' head 9, one face of which seats against theI somewhat enlarged scale, showing the pos1- outerface of the sleeve 6 and the other face tion of the chuck at the time of chucking a. of whlch forms a seat for the ear' blank vgear blank; during cuttlng. Mounted for sli 'ng move- Figure 3 is a view similar to Figure 1v ment withm the member is an arbor`10` showlng the gear blank completely chucked; which 1s slotted longltudinally to recerve Figure 4 is a sectional view, showing the the key 11 secured to the member 8. 'This ke prevents rotational movement of thein the bla ar or in the member 8 while permitting igure 5 is a. section 0n the line 5--5 0f axial movement thelelll. Slidably mounted p in the arbor is a. rod 12 which serves to carigure 6 is a sectional view showing the ry the clamping member employed to secure clamping lingers employed to retain the arthe blank to be cut upon the arbor. This -bor in operative position during operationsj clamping member may be of any usual or upon the blank; suitable character. It may be a.' horseshoe Figure 7 lis a side elevational view, partly washer or any other suitable formrof clampon its arbor;

AFigure 8 is a detail of the mechanism The present inventionhas for its purpose,

ing device. The device shown in the drawings is an expansible bushing 13.

This bushing 13 is of the same character as that described7 in the copending application of Schuyler H. EarLSerial No.` 723,287, tiled June 30, 1924.- This bushing 13 includes a collar 14 (Fig. 4) whichis screw threaded upon the outer end of the rod 12, and a plurality of fingers 15 formed by splitting the bushing longitudinally. The arbor 10 is formed with a tapering outer end with which the lingers of the bushing engage when the bushing is moved axially inwardly. Engagement of arbor and bushing expands the bushing2 thus clamping the gear blank, or other ob]e`ct being chucked, upon the arbor. Preferably the bushing, as in the application above mentioned, is so constructed that its diameter when collapsed is less than the diameter of the bore of the c gear or other object to be mounted upon the arbor, so that when the bushing is collapsed the gear or other object may be removed from or placed on 'the arbor without first disconnectingthe bushing from the rod 12.

To expand this bushing, the rod 12 must 'be moved axially inwardly of the sleeve 6 ber f a rearward direction in the sleeve.

so that the inner faces of the fingers 15 of the bushing engage the tapered outer portion of the arbor 10. lDuring this inward axial 'movement the arbor must be held sta 'tionary so that thengers may be expanded.

For holding the arbor stationary a friction clamp 16 is provided. This clamp consists of a pair of finger members 17 (Figure 6) which are pivotally mounted in a slot 18 provided inthe head 9 of the tubular mem- 8. These members 17 are'mounted with their longer arms lying below the pivots 19 so that when the shorter arms are forced apart the longer arms will clamp the arbor 10. This friction clamp V16. is adapted to grip the thereon,l rearward movement in the sleeve. A coil spring 20 interposed between the' fingers 17 below the pivots 19 serves to move the iingers from-clamping position.

.The means for moving the rod 12 in the arbor 10 for the purpose of clamping and releasing an object, will nour be described. Secured to the inner end of the rod 12, as by means of a turnbuckle 25, .is a piston 26 which is adapted to reciprocate in a cylinder 27 whichy is itselfreciprocable in the sleeve 6. The cylinder 27 is formed with a duct or port 28 through which la uid under compression may be admitted to one side of the piston 26 so as to force the piston forward in the cylinder 27. l A coil spring- 29 mounted uponthe rod 12 serves to actuate the roy;h 1n

ring 29 is' mounted on the rod 12 between t e turnbuckle 2 5 and a. nut 30 mounted coaxially of the rod. The nut 30 is secured in arbor behind a 'shoulderprovided Y thus retaining the arbor 'against the sleeve 6 against axial movement fby means of a pin 31.

The cylinder 27 itself is provided with .an extension 35 which extends into asecond lwhich serve as sockets for the inner ends of a set of toggle' members or bell crank levers 40. These toggles or bell crank levers are fulcrumed in the angles formed between the side wall and the base of a cup 41 which is rigidly secured in the cylinder 36. The-piston 38 is provi-ded with a groove 42 which serves as a socket for the inner ends of the bell crank or toggle members 40. The piston 38 is also provided with a tapered nose .43 which assists in moving the bell cranks from the position shown in Figure 1 to the position shown in Figure 3. The extension 35 is bored as indicated at 45 and 46 to form passageways through which the fluid employed in moving the pistons may be admitted to the cylinders. The passageway 45 conveys the fluid to the outer side' of the piston 38, while the passageway 46 conveys the fluid to the inner side of this piston and also communicates with the duct or port 28 of the cylinderf27 to convey fluid into the cylinder 2 The fluid employed in a chuck constructed according to this invention may be of an suitable character. I preferably use oi This* Huid may be carried to the passageways -45 and 46 in any suitable manner and from any suitable source. As shown, the fluid enters the passageways through T-joints 47 and 48 which are secured to each other and to pipes 49 and 50 respectively which may communicate with a pump or with a fluid pressure line.

The outer end of the extension 35 of the cylinder 27 seats against a ball 52 mounted in a socket formed in the outer end of a spring-pressed plunger 53 which is reciprocably mounted in a socket 54 which is formed in or secured to the guard 55 which surrounds-the cylinder 36 and its cooperat ing parts and is secured to the index mechanism housing 56. A bracket 57 secured to the index housing 56 serves as a support for the fluid conducting pipes 49 and 50.

The o eration of the mechanism so 'far describe `is as follows: Assuming the parts linthe position shown in Figure 1, when it sion of fluid pressure to the'lcylinders is turned so `that the-'iluid employed flows through the pipe 50 into the passageway 46 forming a shoulder 60 which engages the.

inner end of the arbor and carries the arbor forward also.4v At the same time the mounted on an arm 63 secured to t e housing 5. Secured to this stock dividing gauge is a screw 64 which is provided with a tapered head'which serves, when th'el stock dividing gauge has been moved to the position shown in Figuref2, to move the lingers 17 into clamping position where they vwill engage the arbor 10 vbehindits'shoulder. This stock dividing gauge may be of any usual structure or type ordinarily employed on gear finishing machines for correctly positionin the blank before starting operation upon 1t. When the arbor has moved the required distance into the bore of the gear blank G, the valve controlling the admission of the iiuid to the cylinders is moved so that the fluid will flow through the pipe 49 and into the passageway 45: At the same time the fluid may flow out of the cylinder 27 and passageway 46 into the pipe 50. The fluid flowing into the passageway 45 forces "the piston 38 from `the position shown in Figure 1 to the position shown inFigure 3,

during which time the toggle or 'bell crank members 40 force the cylinder 27 rearwardly in the sleeve 6 and with the cylinder, the

piston 26 and the rod 12. As the rod 1 2.

moves rearwardly theshoulder of the arbor is seated firmly against the fingers 17 thus securely holdin these members in clam ing position. The andle of the stock divi ing gauge may then be released and the gauge will be swung out of the way by the spring 65. Further rearward movement of the rod 12 expands the bushing 13 and securely clamps the gear blank Gr upon the arbor against rotational and axial movement. This position is shown in Figure 3 which is the position` of the mechanism during operation upon the gear or blank G. After the required number of operations have been performed upon the blank, the same may be released so as to permit operation upon controlling the flow of fluid to the various cylinders is again -movedso that the fluid flows through the ipe .50 and out. of the pipe 49. The iiuid owing through the pipe l Y.passes through the passageway 46' and The Ifluid acting. piston 26 forces operator pulls down the handle 61 of theA stock .dividing Agauge 62 which is ivotally another blank. For this purpose, the valve duct 28,` thusforcing the piston 38 rear? wardly 1n its cylinder 36 to release the togl'es- 40 and forcing the piston 26 forwardly vm' its cylinder-'27. The forward movement of the `piston 26 is aided by .the springpressed' plunger 53 which expands upon reease of-the toggles 40. The forward movement of lthe piston 26 causes a forward movement of the rod 12.' This Aforward movement of the rod` 12 brings the shoulder of this rod into engagement with the rear end of the arbor 10 lforcing the arbor forward and releasin Xthe fingers 17 from clamping osition. T is forward movement of the ro also 'collapses the bushing 13. The valve is now moved so that fluid flows throughthe pipe 49 andout of the pipe 50. This causes the piston 38 again to move forwardly in its cylinder 36, thereby to draw the cylinder 27' rearwardly in the sleeve.

The rearward movement of the cylinder 27 carries withit the rod 12.` The bushing 13 'will engage thel arbor 10 during this rearward movement and carry the arbor rearwardly also. The bushing 13^does not expand at this time because the clamping fingers' 17. have been released and there isnothing else to hold the arbor stationary.

`Therearward movement of the rod 12 is aided and accelerated by the spring 29 which eX ands when the fluid flows out of the cylin er 27, so that the whole rearward movement of rod and arbor takes placein a very short time. The rearward movement continues until the rod and arbor have been` preferred form of control device -is illustrated somewhat diagrammatically in Figures 7l and 8. 70 indicates the main drive shaft of the machine. trolled by the clutch lever 72 for transmitting the rotation of this main drive shaft to the Vshaft 73. The clutch lever 72 is pivotally mounted at 74 upon any'suitable part of themachine. Pivotally connected with this 71 is a .clutch con- Y clutch lever 72 is a rod 75 which is slidable in suitable bearings provided in the frame ofthe machine. This rod 75 carries at its vinner'end a depending lug 76 upon which is pivotally mounted a linger 77 which, as

will be hereafter described, is adapted to be moved into engagement with a lug 78 secured to arod 79. The rod -79 is slidably mounted in a bracket 101 which is secured This rod has portion. During the operation o the machine the portion 102 seats in the bore of the bracket 101. This rod 79 is pivotally connected as at 79 with a rod 80 to which is secured the slide valve 81 which controls the operation of the chuck. This slide valve 81 slides in a sleeve 82 which is provided with ports or openings 83, 84, and 85 communicating, respectively, with the pipes 49, 88, and 50. The pipe 88 serves to conduct the fluid from its reservoir in the machine or from the pump which pumps the fluid from this reservoir into the valve cylinder 89 whence it is distributed by the valve 81, the sleeve 82, and the pipes 49 and 50 to the cylinders 36 and 27. The fluid is exhausted from the valvecylinder by the port 86. A pipe may be connected with this port 86 leading back to the reservoir or pump or this port may be merely an opening in the valve cylinder and the fluid may flow back by gravity to the reservoir or pump.1

In the position of the valve 81, shown in Figure 7 the fluid flows from the intake pipe 88 through the ports 83 and`84 into the pipe 49. At the same time it exhausts from the pipe 50 through the openings 85 and 86. The valve 81 may be moved to this position by hand by means of the hand lever 90 which is pivotally mounted upon the frame of the machine and which is provided with an arm 91 which actuates the rod 80 through the finger and socket connection 92.

Then the hand lever is in the position shown in Figure 7, the blank may be clamped upon the arbor as shown in Figure 3., The

. machine is then started up by throwing the clutch lever 72 into engaged position. Pivotally connected to this clutch lever is .a rod 93 which is slidable in a bracket 94 which is secured to the frame of the machine. Piv

each minor operation of the machine. For.

instance, after each indexing operation or after each relative withdrawal of tool and blankfor indexing, this rod is advanced a small amount vertically. The advance is such thatjwhen` the operations upon the' blank have-been completed the rod will contact with the nose 99 of the arm 95 and rock this arm in its socket thus withdrawing the keeper 96 from the slot in the rod 93. Release of the rod 93 permits the spring 100 which is mounted on `the rod 75 to throw the clutch lever 72 into disengaged position, thus stopping the o eration of the machine. The movement vof t e rod 75 under. impulse Figure 7. The movement of the rod 7 9 to the left shifts the' valve 81 to the left causing the fluid to flow from the intake pipe 88 through the pipe 50, thus releasing the arbor 10 and collapsing the bushing 13, as has been described above, to unclamp the gear G. As the rod 79 moves to the left, the enlarged portion 102 of the rod moves out of the bore of the bracket 101 and the lug 78 accordingly drops down out of contact with the linger 77, the rod 79 pivoting about the pivot 79. It' desired thebore of the bracket 101 may be provided with a tapering bottom adjacent its left end thereby easing the rod 7 9 into its lowered position. After the lug 78 has dropped away, the linger 77 continues to move to the left until the spring 100 has expanded to its limit. The rod 80 may now be moved to the right by means of hand lever 90 to shift the valve 81 to the right to permit entire withdrawal of the arbor 10 and rod 12 from the now completed gear. Vhen a new blank is to be cut and has been positioned in the manner already described, the machine may be again started up by throwing the clutch lever 72 to the right. The pivotal mounting of the linger 77 permits of this last described movement of the lever 72 and the rod 75 connected thereto, since the linger 77 will ride over the lug 78 when the rod 75 is moved to the right.

In the mechanism described, the movements of the valve. 81 necessary to the various operations of the chuck are controlled by the hand lever 90, with the exception of the releasing operation which is automatically controlled by the stopping mechanism described. The control for the valve is, however, subject to modification without departing from the spirit of this invention.

Having thus described my invention, what Iclaim is:

-1. In a chuck, a sleeve, an arbor slidable in said sleeve, means for clamping the arbor against rearward movement in said sleeve said means being releasable by forward movement of the arbor, a member, adapted to carry a clamp for clamping an object on said arbor, slidably mounted on the `arbor means on said member adapted on forward movement of said member to engage said arbor and means for moving said member in opposite-directions.

2. In a chuck, a. sleeve, -an arbor slidable in said sleeve, means for clamping the arbor againstrearward movement 1n said sleeve, said means being releasable on forward movement ofthe arbor, a member, adapted to carry a clamp for clamping an-object on rsaid arbor, slidably mounted in the arbor means on said member adapted on forward movement of said member engage saidl lou arbor, fluid pressure operated means for moving said member 1n one direction and means for moving said member in the opposite direction.

3. In a chuck, a sleeve, an arbor slidably mounted in said sleeve, a member, adapted to carry a clamp for clamping an object on said arbor,slidably mounted in said arbor, fluid pressure operated means for moving said member in opposite directions, means whereby the movement of said member is transmitted to said arbor and means adapted to-be, engaged with said arbor to prevent rearward movement of the arb in the sleeve and permit relative movement between said member andy arbor.

4. In a chuck, a sleeve, an arbor slidably mounted in said sleeve, a member, adapted to' carry a clamp for clamping an object on said arbor, slidably mounted in said arbor, means whereby movement of said member v is transmitted to said arbor, means adapted to bevengaged with said arborto prevent rearward movement of the same and permit relative movement between said member and said arbor, and fluidpressure operated means for moving said member rearwardly relative to sa1d arbor. I

5. In a chuclnpa sleeve, an arbor slidably mounted in said sleeve, a member, adapted to carry -a clamp for clamping an object on said arbor, slidably mounted in said arbor, means whereby movement of said member is 'transmitted to said arbor, fluid pressure operated means for moving said member in opposite directions, means adapted to beengaged with said arbor to prevent rearward movement of the arbor in the sleeve and means for moving said member rearwardly in said arbor when said last named means is in engaging position.

6. In a machine for Lproducing gears, an y,

rection.

arbor, means for clamping a gear blank upon said arbor, fluid pressure operated means for moving said clamping means to and' from clamping position, a valve for controlling the application. of fluid pressure, means for moving said valve to cause the release of said clamping means and means adapted to be advanced step by step witheach minor operation of the 1 machine to a position where after completion of a predetermined number of operations of said .machine it-will actuatethe valve controlling means.

7. In a machine for producmg gears, an arbor, means for movlng the arbor into 'and n withdrawing it jfrom the vbore of a gear blank, means for clamping the blank upon said arbor, fluid pressure operated means for moving said clamping means to and from clamping position, a valve for control# ling the movement of said clamping means,

and means adapted to be actuated after a.

predetermined number of operations of the machine to move said valve to release said clamping means.

8. In a chuck, a sleeve, an arborslidable i in said sleeve, means for clamping the arbor against rearward movement in saidV sleeve,

said means being releasable by forward movement vof said arbor, a member, adapted to carry a clamp for clamping an object on said arbor, slidably mounted lin sa1d arbor, spaced means carried by said member adapted to engage said arbor on movement yof said member in either direction, a piston connected to said member, a cylinder in which said piston slides; fluid pressure operated means for actuating said piston 1n one direction, means for actuating said piston in the opposite direction, and means for moving said cylinder bodily in opposite directions.

9. In a chuck, a sleeve, an arborlslidable:

in said sleeve, means for clamping the arbor against rearward movement in said sleeve,

lsaid means being releasable on forward movement of said arbor, a member, adapted to carry a clamp for clamping an object on said arbor, slidably mounted in said arbor, a piston to which said member isconnected, a cylinder, in whichsaid piston is reciprocable, reciprocably mounted in said sleeve, said cylinder being provided with a port for admitting fluid pressure to one side of said piston, means for actuating the piston in the opposite direction, a second cylinder secured to said sleeve, a piston reciprocable in said second cylinder, means for directing fluid pressure 'to opposite sides of said last named` piston, means adapted on movement of said last named piston in one direction to frmove the first cylinder rearwardly in said sleeve and spaced means on said slidable member adapted to engage said arbor on movement of said member in either di.

10. In a chuck, a sleeve, an arbor slidable in said sleeve, means for clamping the arbor against rearward movement in said sleeve, said means being releasable on forward movement of said arbor, a rod slidable in said arbor, spaced means carried by said rod ladapted lto engage said arbor on movement of said rod in either direction, a piston connected to said rod, a cylinder in which said piston reciprocates, fluid pressure operated means for actuating said piston in one direction, means for actuating the piston in the opposite direction, a second cylinder se- 'cured to said sleeve, an extension on said first cylinder, a piston slidable in saidsecond cylinder and on the extension of the first cylinder, said extension being bored to form ducts for conducting fluid pressure lto opposite sides 'of said second piston, one of said ducts communicating with the first cylinder to admit fluid pressure to one sideA -of the piston movable therein, means adapted movement of said 'mem er in either to be engaged with 'the extension `the sleeve, and

in said sleeve, means for clamping of the first cylinder, on movement of the second piston in its cylinder, to move the first cylinder in meansfor actuating said first cylinder in the opposite direction.

11. In a chuck, a sleeve, an arbor slidable in said sleeve, means `for clamping the arbor against rearward movement in said sleeve, a member, adapted to carry a clamp for clamping an object on said arbor, slidably mounted in said arbor, spaced' means carried by said member adapted .to en age said arborl on direction, V`a piston connected to said member,'a cylinder in Lwhich said piston slides, ilud. preure' operated means for actuating saidv piston in one direction, means for actuating said piston in the oiposite direction, and' means for moving-sai cylinder bodily in opposite directions.

12. Ina chuck, a sleeve, an arbor slidable in said sleeve, means for clamping the arbor against rearward movement in said sleeve,. a member, adalgted to carry al clamp for clamping an ob]ect on said arbor, slidably mounted in said arbor, a piston to which 'said member isy connected, a.c`ylind'er,. in which said piston is reciproc'able, reciprocably` mounted in said sleeve, 'said cylinder bein provided with a port for admitting flui pressure to oneside of said piston, meansl for actuating Athe piston-in the opposite directin,\a second cylinder secured'to said sleeve, a piston reciprocablein. said second cylinder, means for directing iuid pressure toopposite sides of said last named is'ton, y,means adapted on movement Vof said last named ist/on in one direction to movethe-first cyl- 1nder\ rearwardly in said sleeve andy spaced means on' said slidable member adapted to engage .said arboron movement of said memberin either direction.

13. In a chuck, asleeve, an arbor slidable Y the arbor against'rearward' movement .in said sleeve, a' rod slidable vin said arbor, spaced means carried by said rod adapted to eng'a arbor von movement of said rod in eit er direction, a piston connected to said rod, a c linder in which said piston reciprocates, uid pressure operated means for actuating said piston in one direction, means for ae'- ltuating the piston inthe opposite direction, asecond cylinder securedto said sleeve, an extension on said first cylinder, a piston slidablein-said second cylinder and on the ex- -tension of the irst cylinder, said extension bored to form ducts for conducting ilui to opposite Asides of said ond piston one of said ducts communicating with the :im cylinder to admit fluid lessure to one side of the piston movable erein, means adapted to be en aged vwith the extension ofthe first cylin er, on movement of the second piston in its cylinder, to` move the rst 'cylinder in the'sleeve, and means for actuating said first cylinder in the opposite direction.

'14. In a chuck,'a sleeve, a cylinder secured to said sleeve, 4a member reciprocable in said cylindelg'a piston mounted in said cylinder and slidable on said member, means adapted on movement of the piston in one direction to move said membervin the opposite direction, an arbor adapted to extend into the bore of the object .to be chuclred slidably mounted in said sleeve, a rod slidably connected with said reciprocable member and reciprocable in the bore of said arbor, means carried. by said sleeve for holdin said arbor against rearward movement in sald' sleeve, means carried by said rod adaptedto clamp an object on said arbor on rearward movement of the rod, means on said rod adapted to en age said arbor to move the latter rearwar y in said sleeve on release of said arbor holding means and means on said rod adapted to release said arbor holding means on forward movement of said rod.v

15. In a chuck','a sleevefa cylinder s ef cured Jco-said sleeve, a member reciprocable in said cylinder, a piston mounted in said cylinder and slidable on said member, means for selectively a plying uid pressure to the opposite ends o said piston, means adapted to be actuated by movement of said pistonin one direction to move said member in said cylinder, a second c member, a piston sli able in said secondk cylinder, means for applying'luid pressure to one end of. said vpiston to actuate the piston in one direction and means for actuating the piston in the op site direction, an arbor adapted to exten into the bore of the obs'aid ject to be chucked, slidabl mounted insad sleeve, a rod secured to sai second piston reciprocable in the bore of said arbor, means carried by said rod for clamping the object on said arbor, means for holding the arbor against rearward movement! in said sleeve, means on said rod adapted -to en the arbor to move the same rearwardl 1n the sleeve on release of the last nam means, and means carried by said rod adapted to re linder secured to said llU lll

lease thebor holding meanson forward,r

movement of said rod.

` EY'V'IND FIETSEN.

Images