US1150925A - Dash-pot. - Google Patents

Description

y n. E. BENNER,

` DASH Por. -APPLICATION FILED-APR. 24. l9-08.

Patented Aug. 24, 1915.

STATES PATENT OFFICE.

RUSSELL E. BENNER, DETROIT, MICHIGAN, ASSIGNOR T EURROUGHS ADDING .MACHINE COMPANY, OF DETROIT, MICHIGAN, Al CORPORATION OF MICHIGAN.

DASH-Por.-

v To all w/Loip it may concern Be it known thatl, RUSSELL BENNER, acitizen of the United States, residing at Detroit, in the county of l/Vayne and State of Michigan, have invented certain new and useful Improvements in Dash-Pots, of which the following is a specification.

My dashpot is particularly designed with reference-to adding machines of the type shown in Patents Nos'. 504,963 and 505,078 in whichy a handle is drawn forward after the stops corresponding to the numerals to be registered have been set, and then released to complete the operation of the ma? vchine under the influence of a rather powerful spring. It is desirable that the forward movement of the handle be made 'at a rea' sonable but. limited speed and the reverse movement'be made under less restriction for the most part but checked or slowed down as the handle approaches its normal position. The dashpot which forms the subject mattei' of the present application is pai'- tcularly adapted to accomplish this regulation of the movement of the adding machine 'Y proper, a downwardly-projecting hollow l parts thoughobviously it maybe used in other connections where similar regulation is to be effected, and certain of its principles .-and featuresare applicable to dashpots in general, Yas wil-l appear more fully from the following detailed description of a. pre-- ferred embodiment of the invention in con-- nection with the drawings to which refer ence is made. f

' .part of this specification illustrate a pre- The accompanying drawings which form ferred form of: embodiment of the present invention, Figure-l representing a vertical section of the dash-pot with the piston at s 40' the end of its stroke; Fig. 2 representing a similar sectionof the dash-pot at an inter.- mediate stage in the operation of the may' chine; F ig. 3 representing a fragmentary lsectionalized elevation of the dash-pot, the section being at right angles to that of Figs. l and 2; Fig. 4 representing a bottom plan view of the piston with the cylinder or shell .'in horizontal section; and Fig. 5 representing in perspective a plunger device detached.

In the laccompanying'drawings I have villustrated my improved dashpot devices with lthe piston and cylinder shown With bearings for connectiongto the proper ele- Specication of Letters Patent.

tomi and opening at both ends,v

i the tubular. extension-847b ments o f an adding machine of the character.

described or other machine elements', the relative movements of which are to be regulated thereby.

Referring now to Figs. 1 and 2 the reference numeral 847 designates the piston proper which occupies the bore of 'the shell or cylinder 892 with sulicient clearance to provide for the latter-s sliding back and forth over the sides of ,said piston. The late ter. is formedl witlr longitudinal ports or passage-:wijs a extending from top to botsaid ports being lined with soft metal bushings 6 which preferably project slightly above the upper surface of the piston forl a purpose herein-'- after explained. The piston is formed with a central elongated cylindrical portion 847n open at the bottom and closed at Athe top and upwardly beyond this cylindrical portion extends a tubular part 8117* to which the stem 802 is joined. Within the cylin- Patented Aug'.'24, 1915.

Application led April l24, 1908. Serial No. 428,999. y

drical portion 847a of the piston there slides a plunger' comprising a central piston-like part 830, fitting the large .bore ofthe .piston 'stem' or tubular part 830a forming an\oil tance in continuation of the lower stem and `grooved in' one -side as at o to provide a permanent passageway between the interior of A of the piston and the interior ofthe cylinder 847g. A spring end against the upper end of the head of the cylinder 847a and at its other end against the central piston-like portion of the plunger,

this spring thus tending to thrust the latterlnotches z' as most clearly seen in Fig. 5. Y. O11 the' exterior of the cylinder 847a there is arranged -to slide ar sleeve 827 having atu its lower end a flange 827 spaced Vfi'omvthe 889 su-rrounds the 'stem'830b bearing at one but having ports alining with the ports f5 ythough ot restrict* .i diameter.

The sleeve is prevented troni turningr by a pin .if projecting. upwardl) t'roin the piston (Fig. 3)

and loofzelv engaging an opening' in the llange'o'i Said f/ constituting a ballle plate.' ft nut 847", serewinfr upon the tubular part tl-T of the piston provides a shoulder to'liinit the up ward niovennnt ol the sleeve of?.

'The operation ot' the dasli-pot vis aS f0llows: Normally with the ovlinder S92 el'evaled or tht` piston,depressed aeeording' to which element is attaihed to the movable part the hollow stein Silo" is in eontaet, with the base ol" said cylinder and the spring ttfl is compressed as shown in Fig. l. The sleeve 92T is elevated at the eonelusion of a retnin stroke ol the piston but after a period ot rest of the niaehine would settle upon the piston or the bushings (i. Aitt'an'v rale downward movement oi' the #vlinder H92 or upward niovenient ot the piston iniinediatelv rauses the said sleeve to lower relatively to the piston` bringing its flange H27* upon the upper ends ot the bushings o. thus restrieting the passage-veais to the diaineterot' the ports lt will of course be luider-stood that the e'vlinder $92 is tharged with oil as indicated in the drawings and that as said cylinder lowers this oil linds its `wav through .the ports r1, and f.

li'ith the lowering of the ejv'linder H92 its base. separates 'front the plunger stein Hilti and the spring S85) eventually thrusts the plunger Sil() downward` so that at the end ot the vt'orward stroke the parts have assumed the relative positions illustrated `in Fig. 2. lt will be observed that the plunger HIE() has taken up a position at the lower end ol' the vlinder H47, the oil having entered freely through the'tubular stein S30 and the port li as theplunger assumes'that position under impulse of the spring S89. lt will be understood that there is' ample space be tween the stein 83V andthe washer dfor the oil to pass through as said plu-nger thus moves outward or downward; Now as soon as the cylinder starts back the sleeve 827 is slid up on the eylindertl by the pressure of -foil against its flanges (j and 827'?, the latter'-unevering-the ports a' and thus permitting acceleration in the return movement of parts,l both of said flanges being sepa v rated from the walls of thefeylinder by ample spat-es.` But `when the base'of'the eylin der Sfstrikes ,the end of thejhollow 'stein tlwla marked retardation takes place for a quantitykofoil is trapped in the chamber ot the cylinder 847, and there is no escape except through the small notehesli. Consequently the remaining return movement ot parts is considerably slowed down and ain;

sleeve has an upper flange AVAILABLE copy ple time will be allowed for the transfer or carrying operations no matter how many' are totalte place successively. r"he downward inovenient of the Cylinder `or the upward nioveinent ot the piston isretarded only proportionally to the limitation of the flow ot' liquid through the. piston by the ports fas eoinpared to. the restriction of flow occasioned b v the size ot the ports (a and such relative movement of the piston and `e vlinder is ol1 course unaffected bjr the plunger within the ychamber Sli though the latter when rel msed by the upward movement ol thel piston relative to the .cylinder shifts as -above described. The upward movement ot' the evlinder with respect to the piston even less restrieted. because of the inoveinent ot' the ported 812i' until the bottoni of the cylinder eoniesn Contact with the hollow stein 'S-l0 and tl'ie'efore up to sueh point the relative movement of the parts is more rapid. The restriction for eheeking and cushioning is solely that atleeting llow .of oil out ot' theiinterior plungerevlluder 84T, and the start down,- ward o't' the exterior eylinder @|92y is not rbsisted by anvvaruuni etleet within said inl terior vlinder. The start downward of the exterior evlinder does not have to be accompanied by flow ol' oil to said interior cylinder through the restricted ports formed by4 the notehes e'. 'lhe exterior cylinder simply nioves awa)` troni the notched stem and the oil flows to the interior cji'linderifreely therealter as the spring 88H forces the plunger down. The projection ot' the bushings b above theupper surface ot' the 'piston 84T obviates sut-,tion whieh might result as the handle starts rearward. from Contact of the flange 32T with so extended a surface as that presented h v the upper side of said piston. it will` be understood that the upper flange r/ serves to prevent the oil from shooting up through the ports when the piston 'returns heine and causing a spraying or foaming in the upperpart of the cylinder.

v`While the construction here shown is well adapted to thoroughlyI fulfil the objects primarily stated vet it is to be understood that the invention may be Carried out otherwise and the lainis which follow` are phrased accordingly.

li'hat l claim is:

l. 1n a dashpot, the combination of a eyl-v inder and a piston. there being provision for the passage ollluid from one side ot' the piston to the' other, said piston being formed with a longitudinally extending chamber, a plunger movable in said chamber. there being eoinmunieation between ,said chamber vand the exterior thereof. said plunger adapt- 1,150,925 .l i g carried by the piston -and portedl for the passtog'eof the fluid, said member adapted to 'contact With the head of the cylinderD at one end kofrthe stroke Withprovisions fon' thereby restricting the fluid flow.

3. In 'ai dash-pot the combination of ,an enrterior'rcylndel a Ported all@ Chilmbered Pis-A ton, and'a plunger in th chamber of the.

piston having a passage gepening into the same 'and into the extenor cylinder .and

adapted to contact with the head of the lat.

ter atl one end of the stroke with provisions for thereby'restricting the fluid flow between the chamber and theylinder.

4l. In a dash-pot the combilnation of an exterior cylind'er, a .ported and chamberetd.

piston, and a plunger in the chamber; of the piston having a passage openinginto they same andl into Ythe exterior cylinder and adapted tocontactJvith the head of the latter at one end of the stroke with provisions for thereby restricting the fluid flow be -tween the chamber and the cylinder, the

, said Vpiston being cylindrically chambered;v 30, i tion fitting said chamber and a' tubular stem plunger being spring-pre` d toward the head ofthe latter.

5. In a dash-pot, the combination of an exterior cylinder; a piston therein ported for the passage of friid in'either direction,

and a plunger comprising a lpiston-like pory projecting therefrom for contact with the head of the cylinder, said plunger being ported to provide for communication between the chamber and the interior of the tubular stem and 'the latter formed to cause restriction of fluid flow when in Contact with "the cylinder head. 1

of the plston proper, and a;tubular stem projecting outof the chamber and adapted to contact with the head of the cylinder, said plunger being ported to provide for com-v munication between the chamber andthe interior o ,frthetubular stem and the latter formed to cause restriction of fluid flow whenin contact with the cylinder head.

f7. In a dash-pot, the combination of an exterior cylinder; la piston thereinported [for the-passage of fluid in either direction,

said-piston being .cylindrically chamberedy' a plunger comprising a piston-like portion fitting said chamber and a tubular stem pr'ojecting therefrom for contact with the head of the cylinder, said plunger being ported to provide for communication between the chamber and th'e interior of the tubular stem and tha latter 4formed to .cause restriction of fluid flow when in contact with the .cylinder l head; anda spring forcing the plunger outwardly.

8. In a dash-pot, the combination of an exterior cylinder; l a piston therein 'ported for the passage of fluid in either direction, said .piston being cylindrically chambered and bored; a plunger comprising a central piston-like'portionfitting the said chamber, f a; guiding stem engaging the bore of the p1ston proper, and a tubular stem projecttact with .the .heady of the cylinder, said plunger being ported .to provide for com formed to cause restriction of fluidl flow when in .contact with the cylinder head; and a spring surrounding Vthe, guiding stem of the plunger and tending to force the latter `outwardly.

9. In a dash-pot the combination with vcylinder and piston, of a sliding tubular member carried by -thejpiston and ported forv the passage -of the fluid, .said tubular member adapted to contact with the head of the cylinder at .one end of the A stroke and -ing out of the chamber and adapted to conj munication between the chamber ,and the interior o f thel tubular stem and the latter` being notched to then permit restricted fluid flow.

L 10.111 a dash-pot, the' combination of 'an I exterior cylinder; a 'piston therein ported' for the'passage of fluid in either' direction,

said piston being cylindrically chambered; and a plunger comprising a piston-like p ortion fitting said chamber and-Ia, tubular' stem projecting therefrom for contact w-iththe -head of the cylinder, said plunger' being ported to provide for communication bemit restricted fluid flow when in contact 'with the cylinder head.

11. In' .a dash#pot, the' combination of'an tween the chamber and the interior of the i tubular stem and the latter notched 'to per.-

exterior cylinder ;l a Apiston therein ported.

for the passage of fluid in either. direction, said piston being cylindrically chambered;

a plunger comprismg a piston-like portionA fitting said chamber and a tubular stem projeclting therefrom for Contact with the head of the cylinder, ,said plunger being ported to provide for communication between the chamber and the interior of the tubular stem and the latter notched to permit restricted fluid flowI when in Ycontact, with the cylinder head; anda spring forcing the plunger outwardly.

l2.` In Va dash-pot, the combination of an exterior cylinder, piston therein ported forA Afluid flow in either directiona'nd a sliding,

sleeve on the'piston flanged to cover the port or ports of the latterfand itself restrictedly ported, said sleeve having 'a second flange extending over the port ofthe firstmentioned flange. l

13. In a dashpot, the combination of an exterior cylinder, a piston-therein ported for forming a chamber therewith, there being',

fluid flow in either direction and having a raised portion encircling the port, and a slidingr closure piece for the piston port adaptedto seat against said raised portion while separated from the surrounding sur 'face of the piston, said closure itself beingr restrictedly ported in alinement therewith.

14. In a dash-pot the 1combination of an exterior cylinder, a ported and chambered piston, a plunger in the chamber of the piston having a passage openingr into the same and into the exterior cylinder and adapted to contact with thehead of the latter at one end of the stroke with provisions vfor thereby restrictingthe fluid flow between the chamber and the cylinder, and a sliding closure piece for the piston port itself restrictedly ported in-alinement therewith;

15. In an appliance of the character described, the. combination of means Jfor uniformly retarding the stroke in one direction, means for Apermitting,r acceleration in the opposite direction throughout the greater portion of theistroke, and luid operated means ior retarding and cushioningr the latter stroke at its end, while elin'iinating suction or Ivacuum resistance lat the lconnnencement oi the lirst-mentioned stroke. A

1G. In'a .dash-pot, a cylinder and piston, the latter provided With a relatively mov?, able membermounted in the piston and provision for the passage of liquid to and from said chamber and means for arresting. the movement of said movable member during the latter portion of the movement-of the piston. I-

17. In a dashfpot, a cylinder and piston provided with passages for iiuid from one side ,of the piston'ut'o the other, means for throttling the lowofliquid in one direction only, a chamber in the piston, av plunger movable in the chamber, means for arresting the motion of the plunger' as the piston nears the end of its stroke there being a passage from the chamber to the exterior o f the piston andprovision for throttling the passage` when the plunger moves inward in the chamber.

18. In a dashpot, a cylinder and piston, the latter provided with a relatively movable member mounted in the piston and forming a chamber'therewith and having'a port therein for the passage of liquid to said chamber, and means for arresting the movement of said movable member during the latter portion of the movement of thepiston and decreasing the fiow of fluid through said port.. f v

19. In a dashpot, the lcombination with lthe cylinder andpiston, of an axially slidfing member mounted in and closingr a chamber in said piston and having a passage f -therethrough, said member adapted to come "in contact with the head of the cylinder and l.thereby partially close said passage.

RUSSELL E. BENNER.v

Witnesses J. VINCENT, Il. S. MIELERT.

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