US1334503A - of chicago - Google Patents

Description

I. A. OLSON. POSITIVE GBIPPING CYLINDER. APPLICATIDN FILED APR-15; I918. 1,334,503. Patented Mar. 23, 1920.

3 SHEETS-SHEET I- I. A. OLSON.

POSITIVE GRIPPING CYLINDER.

APPLICATION FILED M fl.15,191f3.

' Patented Mar. 23, 1920.

3 SHEETS-SHEET 3- IlI/ll/IIIIIII/ umrnn [snares PATENT cur os.

worm A. OLSON,

OF CHICAGO, ILLINOIS ASSIGNOR TO AMER IOAN PNEUMATIC I C'HUCK COMPANY, OF CHICAGO, ILLINOIS, A CORPORATION OF ILLINOIS.

POSITIVE-GRIPPING CYLINDER.

To all whom it'd nay concern:

Be it known that I", JOHN 'A. OLsoN, a citizen of the, United 'States' of America, residing at Chicago, in the county of Cook and State of Illinois, have invented certa n new and useful Improvements in Positive- Gripping Cylinders, of which the following 1s a specification, reference being had therein to the accompanying drawlngs This invention relates" to positlve gripping devices and refers more particularly to a gripping cylinder adapted for obtaining increased gripping power for holding the work in lathes or. other rotating devices, although the invention in its broader aspectsis not limited to the particular use mentioned.- I

' Among the objects of the invention are to provide a construction wherein the drawvrod of the gripping member is formed 1n two separate parts, a longitudinal movementof one of which parts produces a lesser longitudinal movement of the other part;

to provide a construction wherein the work is positively gripped and after once being locked will be held from release even, though the pressure in the cylinder be reduced to provide a construction wherein less power in the cylinder is requiredfor producing the necessarygripping action, and which a given movement of thecylinder Wlll preferably produce a lesser" movement of the plunger rod at the work end of the device; to provide a cylinder of the character above referred to through which the work can be extended; to so construct and arrange the inlet passages to the cylinder that power will be applied on both sides of the shaft; to provide improved packing means for preventing leakage past the piston; and in general to provide an improved and 81111- plified cogstruction of Q-oliaracter above referred in the drawings:

Figure 1 is a longitudinal sectional view through a device embodying my, invention, parts being shown in elevation;

Fig. 2 is a viewsimilar to Fig. 1 through the work-holding device; a

Fig. 3 is a view similar to Fig. 1 showing a modified construction;

Fig. 4 is a cross-section on the line 1 -4 of Fig. 1. Y

first in detail the constructive gripping c [is as follows: .en the parts are in $119 Specification of Letters Patent. Patented Mar, 23, 1920, Application filed April 15, 1918. Serial No. 228,734.

This pisinlet conduit D and the piston B is formed with a hollow passage B one end of which is offset diagonally to one side of the rod B, while its opposite end is connected to a:

plpe E which extends-through packing E and telescopes with the inlet passageway E The arrangement is such that when it is desired to propel the piston toward the end G of the cylinder the compressed air is admitted through the nipple D to the passageway D. This forcesthe piston to .ward the right where it is held by the compressed air. When, however, it is desired to retract the piston, that is, to move it toward the left, the compressed air is admitted through the nipple D to the chamber C .on the right hand side of the piston B through the passageway B. Suitable means (not shown) is provided connected to each of the nipples to permit of the exhaust of the compressed air on either side of the piston.

The adjustment or reciprocation of the piston, as above described, is employed for actuating a chuck or other suitable gripping device as follows: Extending intothe forward projection or housing 13" is the free end G of a plunger rod G. This end telescopes over a projection B on the end of the draw rod B. and carries a bearing member H having a ring-shaped portion H;

where the cylinder A is non-rotatable the member K is independently rotatable on the draw-rod B, but where the whole cylinder revolves with the work the member 7 K is keyed to the draw-rod'B.

At'its-forward end'the rodG is connected infiap suitable manner to the movable mem bers" of a chuck M or'other-suitable work holding device. The operation of the posilinder as so far described position shown in Figplgthe members L force them have been withdrawn to -the left so as to the action of the, inclined or b cam surface toward'the center, thus grip- Ping the spindle'N of thearticle to be M- tated, In this position the ends K and K of the levers J and J. have been forced up onto the to of the cam member K and will remain. locged in this position until the movement of the piston B toward the right first releases and then positivel forces the ends K- and K toward each ot er. In releasing the work from the position shown 1n 1 ,Fig. 1, compressed air', gas or other suit- -H on the member H.

able substance is admitted through the inlet D which, acting on the piston B, forces the draw-rod B- and. projection B? toward the ri ht. It will, however, have, no effect upon 51c rod G .(which in reality forms the second part of'the two-piece draw-rod) until the shoulder O strikes a ainst the shoulder urther movement of the piston toward the ri ht will carry the member H and rod G' with it so as to cam inember K.

grip ing device toward the left. As the mem ers L ridebeneath the inclined surface I lows:

and J*., In so doing the. levers w the member H toward the left and pull the shove the movable members L out from beneath the inclined surface U and thus release the work. However, in moving toward the ri ht, the member H, throu h the action ofr't e rin I-I on the seats will cause the ends and K' of; the levers to move down the inclined surface .K of the Inthis position the ,work' is released and the device is ready to grip another piece of work, which gripping action is as fol- Compressed air or other gas is now admitted through the nipple D and passageway E to the 'ri ht hand side'of the cylinder. This willorce the piston B to move away from the wall C and carry with it the rod B and cam member K, the,latter riding beneath the. ends K and K will rock the levers J and J about their plivots J 2 1 I adjust rod'Gr and the movable members L of the L they will be forced together and tightly grip the work However, owin to the pro- .portioning of the ends of the ever J with reference. to the pivot ,I point, a one-inch movement of the rod B will cause only a fraction of an inch movement of the pulli rod G. Therefore a comparatively smal cylinder can be employed for operating devices where considerable gripping strength necessary, which arrangement reduces the size and cost of the gri ping device. 7

"In orderto prevent t e lever from being" ved towardthe rig-ht asuflicient distance ress against the spindle end of the ma o m ,in a non-rota le condition, the heel J of the member. J 'jis so arran ed that-it will strike against the member and form a locking device, preventing further movement toward the ri ht. I

It will be notice thatin addition to the packin C and E' previously mentioned the cylmder is provided with 'a packin P and the piston with a t ese packing P packings all being prefera- 1y of esser width at the lunar side than at the outer side and y I inclined outwardly so that when the locking members P are tightened up they will wed the packing into tight engagement with t e walls and form a very efficient seal. The division between the various parts of the casing of the cylinder A is such that these this construction are arranged at opposite sides of the rjod Q, the assagewa B being extended around to't e rlght hand side of the pistonor plun r. 4

Additional packings 5, and S are employed in this construction and intermediate the packin S and S there is interposed a loose col ar S which, together with the packings S andS, forms a seal very necessary to the practical operation of the device. Otherwise the construction shown 'm' Fig. 3 is substantially as that shown in 4 Fig. 1, in both cases the collar S beingemployed. The construction shown in Fig. 3 is particularly adapted foruse where the article .operated on.-1s of a length which makes it necessary to permit it to project through'the' cylinder. Various changes,

however, in the details of construction and arrangements and combinations of parts can be made within the scope of my invention.

What I claim asmy invention is:

- 1. A positive grippingdevice, comprisingv a cylinder, a piston movable in said cylinder and a draw-rod formed of two sections one of which is connected to the piston and the other of which is connected to a work holder or the like, and a connection between said sections whereby a predetermined movement. of theplston will, roduce a lesser movement in the same irection of the section connectedto the work holder.

2. A -ositive gripping device, comprising a cylin er, a iston movable in the cylinder, a'two-piece raw-rod, one section of/which is qmnected to. the piston and the other section of which is in alinement with said firstm'entioned section and connected to the work, a cam member connected to the firstmentloned draw-rod section, a lever mechaeagues nism having a portion arranged to be opf erated on by said cam, and a second portion arranged to actuate the second section of the draw-rod.

3. A ositive gripping'device, comprismg a cylin er, a iston movable in the cylinder,

' a two-piece raw-rod, one section of which isconnected to the piston and the other section of which is connected tov the' work, a cam member connected to the first-men'- tioned draw-rod section, a lever mechanism having a on by sai cam, and a second portion arranged to actuate the second section ofthe draw-rod through'a lesser degree of movement than and in the same direction as the the like to operate said piston, said cam member and lever mechanism being arranged to form a lock for holding the work independent of the pressure in the cylinder.

5. In a positive gripping device, the combination with a draw-rod having two sec tions, of means for longitudinally moving one of said sections in one direction, and means actuated by said section for longitudinally moving the other of said sections Y in the same direction, saidlast-mentioned (portion arranged to be operated means locking said other section in one posi-- tion of longitudinal adjustment.

6. A positive rippingdevice, comprisin a grippmg'mem er, a draw-rod for longitu ina ly adjusting said member, said drawrod being made in sections, means for longitudinally moving one oi said sections, and means for longitudinally moving another of said sections tion in the samedirection and at a slower rate of speed.

7. A positive gripping device, comprising a gripping memberand a draw-rod for longitudinally adjusting said member, said draw-rod being made in alined sections, means for longitudinally moving one of said sections, and a lever mechanism for longirom said first-mentioned sec- 1 tudinally moving said other section in the same direction from said first-mentioned section, said lever mechanism being arran ed to give a lesser movement to said ot er sectlon.

8. In a gripping device, the combination with a gripping member, of a draw-rod for longitudinally adjusting said member, said draw-rod having a section engaging said member and a second section in alinement with said first-mentioned sectiommeans for moving said second section longitudinally n one direction, means for slowly movlng said first-mentloned sectlon 1n the same direction from said second section, and means for moving said second section longitudinally in the op osite direction, said'second sectlon adapte to abut against said firstmentioned section to move the latter.

In testimony whereof I afiix my signature.

JOHN A. oLsoN.

Images