US963905A

US963905A - Plunger hydraulic elevator.

Info

Publication number: US963905A
Application number: US53339709A
Authority: US
Inventors: Thure Larsson
Original assignee: FRED A JONES; WILLIAM E D STOKES
Current assignee: FRED A JONES; WILLIAM E D STOKES
Priority date: 1909-12-16
Filing date: 1909-12-16
Publication date: 1910-07-12
Anticipated expiration: 1927-07-12

Description

LARSSON.

PLUNGER HYDRAULIC BLEVATOB..

/APPLIOATION FILED AUG. 1| 1904. BENEWED DBO. 16, 1909.

Patented July 12, 1910.

z SHEETS-SHEET 1.

T. LARssoN. PLUNGER HYDRAULIC ELEVATOR. APPLIOATIONTILBD AUG. 1, 1904. BENEWBD DEO. 16 1909.

Patented July 12,1910.

2 SHEETS-SHEET Z.

a M y www f A` UNITED STATES PATET THURE nAnssoN, orv WORCESTER, MASSACHUSETTS, AssIeNon To HIMSELF, FRED a.

I that type of l.hydraulic.elevators which ,are

JONES, 0F WORCESTER, MASSACHUSETTS, .ANDY-WILLIAM EaI).

YORK, N. Y.

PLUNGER HYDRAULIC ELEvaTon. l

Specification of Letters Patent.

STOKES, OF- NEW Patenten July i2, Taio.

Application i1ed"August l, 19,04, Serial No. 219,!38. Renewed December 16,1909. SerialvNo. 533,397.

To all .whom it .may concern:

Be A itknown that I, v THURE Larsson, a subject of the King of Sweden, residing at Worcester, in the' county of Worcester and State of Massachusetts, have invented a new 4andl useful Plunger Hydraulic Elevator, of

which the followmg is a specification.

Theobject of this invention is to improve own as plunger hydraulic elevators.' This type'of elevator consists of a travel of the elevator car,

` smaller` diameter to the top of the cylindelj By admitting `water.,under pressure into the cylinder the ram or plunger is ejected/or lifted to raise `the car,and by allowing water to flow from 'l inder allowing the y than-'the internal diameter vof lower end of the the stulling box. proved advantageous,

the cylinder the plunger descends in the cyl car to 'come down. .In yanelevator ofthis class .-ithas been found desirable to provide the plungerat'its lower end with guiding'means to engage the inside of the cylinder .to prevent the end of the plunger from scraping or wearing on the cylinder in casethe mechanism is out` of line and to prevent the plunger from vibrating `or swaying in its movements. This guiding means, of course," has to be of a vsize to fit or approximately to fit tothe inside of the cylinder and henceis larger the stuliing box. I The use of such guiding mechanismhas introduced a factor of control isv lost ofthe' plunger on its upward movement and if-the plunger runs beyond its normal limit of upward -travel the guiding means will be brought violentlyagainst the stutlng box which will tend to break and destroy the same. To overcome this ditiiculty, it has been proposed to provide the lplunger'with a resilient guiding-means so that the end of the plunger with the guiding means attached thereto can beinserted int-o or ejected 'out through While `this device has it is open to several objections, among which may be noted thatl a resilient guiding mechanism doesnot affordy as laccurate, a working device as one i to wear andthe cylinder usually.` sunk into the ground the distance of fitting into whichl danger, in that if lent mechanism;

the-same will be thrown out of the stutiin'g box'and this ejection may take place with considerable speed, whereby the plunger, bas soon as its' Amomentum is overcome, may drop back on top of the stufling box or laterally clear of the stuffing box and cause a serious accident.- To overcome these dithculties, the mechanism shown and described in this application has been devised.

The mechanism consists in providing a guiding mechanism whichv cannot escape through the stuiiing box and in so arranging the parts that when the plunger exceeds its normal upward travel the working part 0f theplunger will move out of the stutling box and allow the water to escape to stop the upward movement of the plunger, whereby a relief is obtained without allowing the` plunger to escape from the control of its guidlng mechanism or to jump laterally sott' of the stufhng box.

The preferred form of device consists essentially o ffa guiding means Vseparably or yieldingly connectedy with the lower end of the plunger by a reduced connection. This guiding means is preferably made nonresilient so as' to work accurate y underfall conditions. The connection between the guiding means and the plunger is preferably made to have a springv tension so thatfthe guiding means will normally tend to take -its place at the end of the plunger. arrangement,

if derangement should take place and the plunger exceed its upward limit ,of travel, the separable guiding means will engage the stuffing box, as the plunger continues its upward movement, the yielding connection will allowthe plunger to escape from the top of the stutling box. The en` gagementofthe guiding means with the With this stuffing box thus will be an easy one without putting a heavy blow thereon. So' soon as the plungerv escapes from the stuffing box the water will be free to escape atthe top of the stufling box and hence the upward movement of the plunger will stop, but the plunger, while separated from the guiding means, is still connected thereto 4by* the yieldingconnecton so that as the plunger dro s back it will be obliged to reenter thestu ing box,

whereby thel same cannot escape laterally to allow the carto fall. When the plunger is `restored to normal position in the stuffing box the same again takes up the guiding mechanism at its lower end and the parts are restored to proper working condition. Thus liability of accident from the above causesis practically eliminated.

The mechanism also aifords a convenient means by which the plunger can be raised clear of the stuffing box for the purpose of getting at the stuiing box for repairing or adjusting the same.

The mechanism also has the advantage of practically forming a spring buffer for limiting the upward motion ofthe plunger at the lower end thereof.

spective The improvements are shown inl the accompanying drawings, referring to which,

Figure 1 is a sectional elevation of a plunger elevator equipped with the invention. Fig. 2 is a partial sectional View illustrating the operation. Fig. 3 is a plan View of the guiding means. Fig. 4 is a per- View of a detail hereinafter described, and Figs. 5 and 6 are views similar to Figs. 1 and 2 illustrating a modification hereinafter referred to.

Referring to the drawings and in detail, A designates the cylinder, B the plunger, and C the car of an ordinary plunger hydraulic elevator. Screwed on the top of the cylin` der A is a flange plater 10 bolted to which is thestuiiing box. The' stuffing box has an inwardl extending flange 12 w ich is bored or core out so as to have a hole thereto slightly lar plunger. Fitted into-the top of the stuffing box is a follower plate 13 which is bolted to the top of the stutling box and arranged between which and said flange 12 is a suitable packing plunger e l y closed at its upper end and which practically forms a continuation of the plunger.

A guiding mechanism is arranged on the lower end of the plunger. This guiding' mechanism preferably is madel non-resilient. The same consists of a part 16 which has a number, preferably four pairs of extending, ears or lugs 17. Fitted between each pair of lugs is a guiding`wheel or roll 18 which is' journaled on an axle 19 driven into or secured in each pair of lugs. The wheels 18 are curved on their outer periphery so that the same will just clear the inside of the cylinder, as shown in Fig. 3. This formsan efcient guiding-mechanism,

because if the plunger tends to sway or to crowd to one side the proper roll or rolls will engage the inside ofv thecylinder and accurately and easily guideg'rthe lower end.`

of the plunger. Extending up from the part 16 are ears or projections 20 which 4come inline to engage the llange 12 of the stuiling box.

lcylinder 15.

ger than the diameter of the 4ing means against the flange. 14. Screwed into the bottom of the B is a hollow cylinder 15 which is' The guiding means is separably and yieldingly attached to the lower end of the plunger Aby the following connections. A plug 21 is screwed in the lower part of the hollow cylinder 15. Fitted to pass through the same are a plurality Vof rods 22. Three rods, as shown, may be employed to good advantage. 4(ln the top of said rods is fitted a plate 23 and nuts 21 are threaded on the ends of said rods 22. Springs 25 are arranged on each of said rods between said plate 23 and plug 21.k The plate 23 lits fairly closely to the inside of the hollow The lower ends of the rods 22'are extended down through holes bored in the part 16 of the guiding mechanism and nuts 26 are screwed on the lower ends of said rods to secure the guiding mechanismrigidly to said rods.

, The springs 25 are normally adjusted so as to keep the guiding mechanism snugly up against the lower end of the plunger as shown in Fig. 1, so that as the plunger runs up and down the lower end thereofl will be guided in the' manner previously described. If now the plunger, for any reason, should exceed the normal limit -of travel, the projections 20 will en' upward gage the flange 12 of the Shillingl box, thus detaining the guidingmeans in t e cylinder sov and the continued upward movement of the plunger will cause Ithe same to separate from the guiding means until the end of the plunger, which is the lowerend of the hollow cylinder 15, escapes from the stuing box and allows a relief of pressure by the escape of water beneath the lower end of the plunger through the stufling box, as shown in Fig. 2. The impact of the guid- 12 willbe an easy one owing to the relief afforded by the springs 25 and the substantial dash pot action which takes v`place. as the -hollow cylinder 15 moves upward-on the plate 23.

When the plunger separates from` the guiding means, as shown inv Fig. 2, it will not be entirely disconnected therefrom as the rods 22 will still connect these, arts, whereby the plunger cannot escape. ateally;l and whereby, when the plunger a ain descends or is allowed to descend, itvwi'l be' properly guided down into the stuffing to again take -up the'guiding means. The

rods thus lform a reduced yielding separable connection between the lower working end of the plunger andthe guiding means, the lower end la of the plunger practicallycomfprising or containing this peculiar connection. It will also be noted that the guiding means attached to the lower end of the'` plunger by'this yielding or springer com-V bined spring and dash pot connection ,performs an important function in addition, in that it will check the upward run of the plunger with avyielding or spring action,

iio

box

instead of at the toplof the elevator well, y

because if the abnormal run isl checked at the upper point the top of the car may be broken or the plunger may be buckled as the moving force isl applied, of course, -at the bot-tom or end of the plunger. By checking the upward run 'of the plunger at its lower end withl the yielding action, as previously described, no strain is put upon the entire length of the plunger. y

Figs. 5 and 6 illustrate a modification. In this modification the guiding means before described is connected to the lower end of the plunger B by a piece 27 whichis screwed into the lower end of the plunger and which has ascrew-threaded vend which is extended through a hole lbored in the center of the guiding means and on the end of which is screwed a nut 28 to secure the guiding means to said piece 27. With 'this arrangement,

if the plunger should `exceed its upward limit of travel, the guiding means will strike on the flange 12 ofthe stuffing box, but this` blow will not be a serious oneas by the timethis impact takes place t-he working end of the plunger B will be clear of the stuiiing box and the water will be escaping around the reduced shank of the part 2T, as shown in Fig. G. The part 27, ofcourse,

`can be considered or can be made asa reduced or cut-away portion of the plunger B. The details herein shown and described may -be greatly varied by a skilled mechanic wit-hout departing from the scope of my invention as expressed in the claims.

Having thus fully described my invention what I claim and desire to secure by Letters Patent is I.' The combination,k with a cylinder, plunger and stuffing box of a hydraulic elevator, of .a guiding means connected to the lower end of the plunger and arranged to engage the stuiling box, the connection between t-he guiding means and end of the plunger being constructed to allow the water to escape through the stufiing box when the plunger exceeds its normal upward travel.

2. The combination with a cylinder, plunger a'nd stuiiing box of'a hydraulic elevator, of a guiding meansforl the lower end of the plunger, and a reduced connection between said guiding means and the end of the plunger, whereby escape through the stutling box.

3. The combination with a cylinder, plunger and stuliing box of a hydraulic ele'- A vator, of a guiding means for the lowerend 'of the plunger, the lower en d of the `plungerhaving a reduced connection to-'the .guiding means.

water is'allowed to .of the langer, rods extending therefromiup' mechanism lconnected with the lower end of the plunger constructed to separate therefrom in case of an abnormal upward run` 5. The combination with a cylinder and plunger of a hydraulic elevator, of a guiding means yieldingly connected with the lower end of the plunger. i

(5.. The'combination with a cylinder and plunger'of a hydraulic elevator, of'a guiding mechanism connected with the lower end of the plunger with a spring tension. i

'7. The combination' with a cylinder, plunger and stutling box of a hydraulic elevator,` of a guiding mechanism separably connected'with the lower end ot' the plunger, whereby said guiding means can engage the st-ufiing box and the plunger can separate from said guiding means on said connection to allow an escape of water.

8. The combination with a cylinder, plunger and stuiing box of a hydraulic ele-v vator, ot' a non-resilientguiding means connected with the lower end of the plunger constructed to separate therefrom in case of an abnormal upward run.

9. The combination with a cylinder, plunger and stntling box of a hydraulic elevator, of a guiding means consisting of .a part carrying a number of journaled wheels or rolls and a separable or yielding connection between said guiding mechanism and the lower end of the plunger.

l0. The con'lbination with a cylinder, plunger and stuffing box of a hydraulic ele vator, ot' a guiding mechanism for the lower end of the plunger, and a spring connection between the guiding means and the lower end of the plungerhoused within the lower end of the plunger.

- 11.y Ther combination with a cylinder, plunger and stu'tliug box of a hydraulic elevator, of a guiding means for the lower end of the plunger7 rods extending therefrom up `into the lower end of the plunger, and

springs on said rods to form a yielding connection. f

l2. The combination with `a cylinder, plunger and stul'lingbox of a hydraulic elevator, of a guiding means for the lowerend of the plunger, and a yielding connectionbetween said guidingfmeans and -thelower' end of theplunger having provision for a dash pot action'.

13. The combination with a cylinder,

plunger .and stufling box of a hydraulicrelel Vater, of a 'guiding means for' the loweryend.

throng a plug screwed in theend of the plunger, springs on 'said'rods,f and'a plate carried by said rods to forma dash pot.

' '14. The combination'-with a cylinder,

plunger and stuiiing box of a hydraulic eley 'v ator, of a 'hollow lcylinder attached to the .4. The combination with agcylinder and' plunger of 'a hydraulic elevator, of ab guiding" lower end of the plunger vand forming a continuation thereof, a plug screwed 1n the lower end of said hollow cylinder, a guiding.

means for the lower` end of the plunger, rods-extending from said guiding means through said plug,4 springs on said rods and a plate carried by said rods. y

15. The comblnation with a cylinder,

plunger andvstufling box of a hydraulic ele-- vator, ofa'guiding means connected to the lower end of the plunger by a reduced connection, and lugs on said guiding means ar-v ranged to strike on the under side of the stufiing boxto leave communication around said guiding means when the working end of the plunger leaves the stuffing box. y

1G. The combination with the cylinder, plunger and stuffing box of a hydraulic elevator, of a stop or buffer depending from plunger and stuffing box of a hydraulic elevator, of a yielding stopping device connected with-the lower end of the plunger by a reduced connection and adapted to arrest the upward travel of the plunger and allow water to escape from the stuling box.

19. vThe combination with a cylinder,

plunger and stalling box of a hydraulic ele-- ,vator, of a guiding means yieldingly connected with the lower end of the plunger,

wherebyl said guiding means will check the X the plunger with a yielding upward run o action.'

20. The vcombination with a cylinder,

plunger and stuffing box of a hydraulic elevator, of a guiding means yieldingly connected by a reduced connection with the lower end of the plunger, whereby said guiding means .will act as a spring butler to limit the upward movement of the plungerV and the reduced connection will allow an escape of water from the top of the stutling box.

21. The combination with a Vertical plun- -ger and a cylinder, of a stop adapted to depend below the lower end of the plunger .when the plunger is in elevated position.

22i The combination with a plunger and cylinder, of a rigid guiding device in the cylinder, and resilient means for' connecting the guiding device with the plunger.

23. A vertical plunger havin a rigid guiding device resiliently depending from its lower end. y

24. A plunger having a rigid guiding device yieldingly connected therewith.

In testimony whereof I have hereunto set my hand, in the presence of two subscribing witnesses.

THURE LARSSON. lVitnesses:

PHILIP W. SOUTHGATE, Louis W. SOUTHGATE.