US2696996A

US2696996A - Clamping device

Info

Publication number: US2696996A
Application number: US298807A
Authority: US
Inventors: Armin E Engelhardt
Original assignee: Individual
Current assignee: Individual
Priority date: 1952-07-14
Filing date: 1952-07-14
Publication date: 1954-12-14
Anticipated expiration: 1971-12-14

Description

Dec. 14, 1954 A. E. ENGELHARDT CLAMPING DEVICE Filed July 14, 1952 eflzaraif 6 INVENTOR.

a BY 63 United States CLQSJVIPJNGT DEVICE Engelliardt'," Clii'cagfilll: :App'lic'ation July 14, 1952;Serial 1No. 298;807

- z2claims-.- chess-:14

- lhe' presenteinvent-ion relates to clampingtdevices -and has. for its main: objectstheprovisionio'f.-a clamping;.:unit for: -simultaneously tlainping. a ,pair of shaft-s or rods in their mutually-adjusted:position.

-tAnotherJobject of the ,present invention ais thjesprovision of a clamping d'evice emb'odying :a= pairf-of clamping,

mechanisms,- each capable of: receiving :and :clampingone shaft or rod, each=of whichvmechan-i'sms iswactuat'edto an operatiyejposition; by a separate knobathe two mechanisms being so interrelated and interconnected that when one'of said knobs iszoperatedonlybne.shaft or rod is capable: of being -clamped,*lwith :the other shaft or rod nnalfected, and when the other: of said- .knobs is vturned both clamping meehanisms vbeing eapable:of-simulprovision of a clampingtdevice which maytbe capable ot reeeiuingapairofzshafts ofmariousvdiameters.

With the above general objects in view and othersthat will appear as the invention is: better understood,.fthe

endtof-whichextends heyondii-the adjacent end of sleeve- 13; all as is clearly seenin Fig. 3s Saidcylinder-10tand two cooperating sleeves --1-31 and I 1 5 are provided with diametric "andtregister ing; openings for receiving, therewithintshaf tvlfl. Y

Proms-the hereinabove description:itrwill :be quite clear thatwwhenzknobi 112 isturned around boss-L1: and in the direction toward: the adj'aeentnend of cylinder "10,-; the said cylinder will tend to be driven toward said knob 12,v as is; obvious. I .Since I the adjacent :e'nd ofnsleeve 13- remains in' teonta'ct -=with..-the adjacent-face Oink-nob 12 the shiftingg'ofi-said knobuli towardrcylinder lfl will=necessaril-y tend to urgesaid isl'eeveslsto :shiftto: the directionopposite, to -that to which :saidj-"cylinder 210 is urged to shit.

fliherefore-,---due to the, operationiof'-the knob aforfesaid tendencies to shift; to- 1 then opposite directibn's: are impartedto cylinder F10 and sleeve-113.. t Zlhese::sh'iftin'gv tendencies-lo the opposite: idirectionsybyi' thew-two parts will: cause -=the two Qpart's to: press and: bear: against shaft- 16f-by thC :bodyi-po'rtions. thereof: adjacent tsaid, openings, which-function willscause the clamping. action of; cylinder Lil-and sleeveklii-uponzshaft16,;preventing:the latter from-either shifting within -the '-elaimpon from "being entirely withdrawn i ther e'frorn.

The clampingdevice further. includes eylinder. '17, which is provided at one of its endswithtaconcentric, reduced, l threadedboss 18;, for receiving; in I a- 1 :threaded engagement 2k-nob 19.wSaid cylinders: is of comparat-ively snialleridimensions than cylinder :10,- and I of course its.diameter.isl -considerablyisrnaller than-tofi cylinder 10.

same? consists in:the novelconstruction,icombinationand arrangement of parts hereinafter morewfully described, illustrated in the accompanyingdrawing:andtpointedmut. in-the appended claims. w

' ln the drawing:forn1ing a part of ithis application and in which like designating characters refer to corresponding parts. throughout-thezseveral viewsrr t Fig. l show s an: end elevational view ofwthe present device, illustrating i one of thempossible :I-uses: thereof,

namely, when the :same supports- 'a-vdial iindicator for measuring the surface of a:'cylinder rfashionedvbya lathe or like machine, thew-view illustratinga stationaryishaft upon which. the clamping e device may: be tiadjusted, .and also another shaft which supports the dial indicator;

Fig.2 is aside elevational view of :the present clamping device, the view havingabeen taken. along: the plane indicated; by lines 4 2-2 dfcEign 1-;

- Pig. 3 is :a longitudinahcross sectional viewrthroughthe' clamping device of a -1-1; refer-rec1 tfor-n'n.

, Fig. '4 is a-transverse cross sectional view-onlline 4'-4- ofFig 3;

HFig. 5 is a =cross-sectional view taken:-onz line5+-5sof Fig. '3;

Fig; 6 is a side elevational viewl of thezpresentdeuice' of a: modified form; and Pig. 7- is a :longitudinall cross sectional view through the device of amo'dified :form,.-shown in' Fig; =6.

-Referring to the present drawing, andy-particularly to the preferred form of the present device, illustratedain Eigs.--2 to. 5,.- inclusive, theasame includesyoylinder 10, which is provided atoneof its-endswith a-reduced, concentric and threaded boss l'l r Said boss-ll receives-in a threaded-engagement.knob :12. -Set upon-said cylinder.

10 in an encompassing relation is sleeve 13, one,-z outer end of which. is adaprtedu to contact with tires-adjacent end of. knob 12. I "Themppositeiend of said:sleeve' '13 is provided with an: inwardly extendingbevelled fiange 14, tenure purposeslater"described.

"Set upon said sleeve 13, in an encompassingy rel-atiofntherewith, isouter sleeve -15, the-adjacent fllld-fOfwWh'iCh is in}a,--spaced relationwithmsaitlltnobela the opposite so Set, uponl :saidg cylinder 17-. in-an-encompassingrelationis sleeve 20, the inner end'of whichisgprovided with an outwardly extendingtbevelledl-fiange 2 1 Said sleeve 20 is {telescopically receivable within s1e'eve F13, lflanges t 14 and 21- a of said-"sleeves I "13. and: =20, mespectively, being interengaged and normallwhavingitheir =bevelledlsurfaces in contae-t; as-:at-22.l-Ihe :outer free end i of said sleeve 20. fisvin at spaced s-relationwwithithe' adjacent wface of knob tl9.

wStpupon-flsaid i'sl'eeve ds :anothe'r' outer sleeve 23,- the inner endz of .--which-. is, provided with an outwardly extending flange a24,- substantially= .of :=the :diameter corresponding, to -:the.=diameter ofssleeve'fli. =Said-flange 24 is in-contact-with the adjacent end of said sleeve .15.

The-"outer freeaend of, saidwsleeve23 .is :normally" in. contact with the adjaeent i-nnerface of-iknob: 19. I

iCyalinder 1 7,- and-.isleeves 202 and 23 areeach provided with diametric openings of a sulficienttolerance torreceive therewithinifon loose QEOSltlQIliIlg-wOf "shaft or rod 25. t This vis: also t trueof: the opemngsmade in; cylinder 10 and sleevesJB and: 15, which, before the, operation of either: of knobs\1-2 or'19:, are'zcapable ofz receivingishaft 16. or loose positioning;

If r it --betsassumed-:.-thati shaft 1:16-is .:helii :loosely within the camp, vthat is beforefknobi 12 hasxbeentturned, upon boss $11. toLshif-tt the former toward, scylinderzwlfi, turning. of knobdQ-tow-ard {cylinder 1-7 wi1li alonez suflice invorder I to clamp iboth:shafts. (Due:tovthenengagement of. said sleeve -23--t0 one direction, ..and the forcei'olfcylinder 1:7 in the opposite di'rectiOm Ew-iIl firmII iclampi said shaft 25"=Within thezaendi ofshe clamping :devi'ee within which cylinder '17: is positioned; iSimultaneously '"with: the last mentioned: clamping action 'ofk thetdeuicetupon 'shaftf'25 clamping; actiom upon shaft 1'6 is a .exertedz due' to: the rtwo forces to opposite directions set in operation; bytknob '19, namely: theforce of'ste'ndenc c totshift:onntheiparrtiofssleeve ls toward knob :lz bnoughtz-gbouti by pressure: upon *theadjacentnend of? said =sleeve --15g'by flange- 24, 'andth'e force to the opposite direction exerted upon sleeve 13 brought about upon said sleeve 13 by the action thereon by sleeve 20 due to the interconnection of the latter with sleeve 13 through

flanges

14 and 21 and their contacting bevelled surfaces 22. This latter force was due to the tendency of cylinder 17 to shift toward knob 19, and since cylinder 17 is interconnected with sleeve 20 through shaft 25, it necessarily must follow that when cylinder 17 shifts toward knob 19 it must exert an urge upon sleeve 20 to shift to the same direction. The latter urge to shift on the part of sleeve 20 will be transferred to sleeve 13 through the flanged connection between the two sleeves.

From the hereinabove description it will be apparent that when knob 19 is loose upon boss 18 and out of engagement with the adjacent end of sleeve 23, the

operation of knob 12 alone will suflice to lock shaft 16 in the clamp without affecting shaft 25. The latter will remain loose within the clamp. This result is due to the fact that operation of knob 12 alone actuates only cylinder and sleeve 13 for drawing the two in the opposite directions. This result does not affect in any manner either cylinder 17 or

sleeve

20 or 23. However, regardless of the condition of knob 12, that is irrespective whether the latter knob is loose or in locked engagement with sleeve 13, the operation of knob 19 will tend to clamp shaft 16 due to the urging of sleeves 13 and to shift to the opposite directions, by virtue of the action upon said two

sleeves

13 and 15 by flange 21 and flange 24, respectively, under the influence of knob 19, as was hereinabove described.

It is further observed that due to the interengagement of sleeves 13 and through

flanges

14 and 21, respectively, the two principal parts of the clamping device will be incapable of separation in a longitudinal direction, when attempted to be drawn in the direction away from the two

cylinders

10 and 17.

Separation of the two principal parts of the clamping device to the direction toward

cylinders

10 and 17 will equally be impossible due to the bearing of flange 24 against the adjacent end of sleeve 15.

However, when knob 19is loose, irrespective of the condition of knob 12, it is possible to bring about bodily rotary shifting movement of cylinder 17 and its cooperating parts, including

sleeves

20 and 23 and knob 19, together with shaft 25, with relation to cylinder 10 and its cooperating parts, including

sleeves

13 and 15, knob 12 and shaft 16. This result is due to the fact that when knob 19 is loose the contacts between

flanges

14 and 21 at bevelled surfaces 22, on one hand, and between L flange 24 and the adjacent end of sleeve 15, on the other, are devoid of friction and therefore susceptible of relative rotation.

From what has been said it will therefore be clear that when both

knobs

12 and 19 are loosely positioned upon their respective bosses 11 and 18

shafts

16 and 25 may be freely shifted to one or the opposite direction so as to relatively adjust said shafts in longitudinal directions. When said knobs 12 and 19 are in a loose position the shafts may also be relatively adjusted angularly by imparting relative rotary movements to the two principal parts of the clamping device. When one or the other, or both adjustments have been made one or the other of the said knobs are manipulated to firmly clamp one or both of the said shafts within the clamping device.

Referring nOW more particularly to Fig. 1 there is shown one exemplification of the practical adaptation of the present device to use. Shaft 16, which in this instance is stationary, is rigidly supported upon base 26. Said shaft 16 of course is passed through cylinder 10 and

sleeves

13 and 15, said cylinder 10 and sleeve 13 being actuable by knob 12. Moving the clamping device to or away from base 26 will adjust the device with relation to shaft 16.

When the device has been shifted upon shaft 16 to a predetermined height above base 26, by turning knob 12 shaft 16 will be locked to the clamping device.

The upper end of shaft 25 in Fig. 1 is made to support casing 27 containing a dial indicator actuable by pin 28 extending from casing 27 and made to contact with cylindrical work 29 which is being fashioned by a lathe or a similar machine.

After the clamping device had been made firm with shaft 16 shaft 25 was longitudinally shifted within the clamping device in order to bring pin 28 in contactual r shaft of a certain diameter.

relaton with the periphery of work 29. When that was done knob 19 is turned in order to lock shaft 25 in its adjusted position within the clamping device. Great many instances may be found of various practical applications of the clamping device where knob 12 need not be operated first in order to clamp shaft 16 first in the clamping device, but knob 19 may be resorted to directly to clamp both

shafts

16 and 25 simultaneously.

The modified form of the invention illustrated in Figs. 6 and 7 includes cylinder 30 having at one of its ends reduced, concentric, threaded boss 31 engageable by knob 32. Sleeve 33 superimposes said cylinder 30 in an encompassing relation. The end of said sleeve 33 farther removed from knob 32 has an inwardly directed flange 34. A coil spring 35 encompasses boss 31 and is interposed between the adjacent end of cylinder 30 and knob 32. The adjacent end of said sleeve 33 is spaced from knob 32, as at 36.

Encompassing said sleeve 33 is. outer sleeve 37, the adjacent end of which is normally in contact with knob 32, while the opposite end of said sleeve 37 terminates short of the adjacent end of inner sleeve 33.

A diametrical bore is made through cylinder 30 and

sleeves

33 and 37 for reception therewithin of shaft 16. Another bore 38 is made in the said three parts at a right angled relative position to said first named bore. Bore 38 however is of a diameter smaller than the diameter of the first named bore. The two bores are capable of receiving two shafts, one at a time, of two varying diameters. Thus, when shaft 16 is removed from its bore another shaft, of a smaller diameter may be inserted within the clamp and bore 38.

The operation of the parts of the modified form of the invention last hereinabove described is similar to the corresponding parts of the preferred invention. When knob 32 is turned to drive the same in the direction of cylinder 30, said cylinder tends to shift toward knob 32. Knob 32 exerting pressure at the adjacent end of sleeve 37 tends to urge the latter to the direction opposite from that to which cylinder 30 is being urged. The opposite pressures upon shaft 16 by cylinder 30 and slleeve 37 firmly clamp said shaft 16 within the clamping evice.

Coacting with sleeve 33 is cylinder 39, having at one of its ends an outwardly extending flange 40. The inner end of said cylinder 39 and the adjacent end of cylinder 30 are in a mutually spaced relation. Flange 40 is normally in engagement with flange 34, by virtue of which arrangement cylinder 39 is interlocked with inner sleeve 33.

Set upon cylinder 39 in an encompassing relation is a pair of rings 41. One of said rings 41 is seated upon the adjacent end of ferrule 42 which encompasses the adjacent end of inner sleeve 33, and rests upon the inner end of outer sleeve 37. Ferrule 42 extends beyond the adjacent end of inner sleeve 33, effecting space 43 between the adjacent end of sleeve 33 and one of said rings 41.

Each of said rings 41 at the adjacent opposed ends has a plurality of semi-circular recesses 44. Said recesses 44 extend radially in each of said rings 41. Two pairs of opposed recesses in the two rings upon a diametrically transverse line through the device define a bore of the same diameter for passing therethrough a Shaft 25 is extended through complementary bores in the two rings 41 and in a diametrical relation therewith, for clamping the same within the two of said rings 41. Extending from one ring 41 is pin 45. The other of said rings 41 is provided with bore 46 into which said pin enters. By virtue of this arrangement two rings 41 are interlocked in a lateral direction, but are capable of separation in a longitudinal direction.

The opposed pairs of recesses 44 in rings 41 may be made in different diameters. Cylinder 39 may have a plurality of bores also of different diameters, all for the purpose of accommodating shafts 25 of corresponding diameters.

Washer 47 is placed upon the adjacent end of one ring 41. Knob 48 in a threaded engagement with threaded boss 49 normally contacts said washer 47. The adjacent end of cylinder 39 is in a spaced relation with said washer 47 or knob 48.

When knob 48 is turned upon boss 49 toward cylinder 39, said cylinder will necessarily be drawn toward said knob 48. Washer 47 bears against the adjacent end of one of said rings 41 causing said ring to exert clamping pressure upon shaft 25. 'lhe pressure exerted by said knob 48 upon two ri..gs 41 is transferred through ferrule 42 to outer sleeve 37. Said pressure exerted upon sleeve 37 is in turn transferred to and upon shaft 16 to the direction toward the opposite knob 32. Simultaneously, due to the pull exerted upon cylinder 39 by knob 48 pulling force is exerted upon inner sleeve 33 to the direction away from said knob 32. This latter pulling force-is of course accomplished through the interconnection of cylinder 39 with inner sleeve 33 through flanges 34 and 40. Due to the opposed pulling pressures upon shaft 16 exerted thereon by

sleeves

33 and 37 shaft 16 is firmly clamped within the device.

Thus, by virtue of the operation of knob 48 hereinabove described both

shafts

25 and 16 will be firmly and rigidly interlocked with the clamping device. Of course, said shafts may be longitudinally as well as angularly adjusted with relation to each other, same as in the preferred form of the invention. Spring 35 has no other function except to urge cylinder 30 away from knob 32, and with it also sleeve 33, the latter due to the interconnection with cylinder 30 through shaft 16, so that in cooperation with the outer sleeve 37 a frictional force may be maintained at all times upon shaft 16, even though knob 32 is quite loose. By virtue of that frictional force the weight of the device alone will not be suificient to cause shifting of the device downwardly in a vertical direction before proper adjustment of the device upon shaft 16 had been made and prior to driving knob 32 to its operative condition.

It is noted that the bores in sleeve 23 should preferably be made of somewhat larger diameter than the bores in cylinder 17 and sleeve 20.

It is further observed that for all practical intents and purposes, and without detracting in any manner from the proper operation of the modified form of the invention shown in Figs. 6 and 7, ferrule 42 may be made an integral part of the outer sleeve 37. Accordingly, sleeve 37 and ferrule 42 may be considered as one sleeve 37, the adjacent end of which extends to and contacts the adjacent end of ring 41 While there is described herein preferred embodi- 6 ments of the present invention, it is nevertheless to be understood that minor changes may be made therein without departing from the spirit and scope of the invention as claimed.

What I claim as new is:

1. A clamping device comprising a pair of clamping units, each of said clamping units including a plurality of cylindrical members in a telescopic mutual relation, said cylindrical members in each clamping unit being provided with registering transverse bores for extending a shaft therethrough, means in association with one of said clamping units for urging said cylindrical members in opposite directions for clamping the shaft which remains extended through said unit, and means in association with the other of said clamping units for selectively urging the cylindrical members in both of said units in the opposite directions for simultaneously clamping both shafts within said clamping units.

2. A clamping device comprising a pair of clamping units, each of said clamping units including a plurality of cylindrical members in a telescopic mutual relation, said cylindrical members in each clamping unit being provided with registering transverse bores for extending a shaft therethrough, means in association with one of said clamping units for urging said cylindrical members in opposite directions for clamping the shaft which remains extended through said unit, and means in association with the other of said clamping units for selectively urging the cylindrical members in both of said units in the opposite directions for simultaneously clamping both shafts within said clamping units, some of the cylindrical members in both of said clamping units being interconnected in such a manner as to cause the action of said second named means to be extended upon the cylindrical members of the said first named unit.

References Cited in the file of this patent UNITED STATES PATENTS