US1835850A - Pneumatic drop - Google Patents

Description

J. T. COWLEY PNEUMATIC DROP Dec.. 8, 1931.

Filed Feb.. 20, 1928 3 Sheets-Sheet 2 Dec. 8, .1931. J, T, COWLEY 1,835,850

PNEUMATIC DROP Filed Feb. 2o, 1928 '3 sheets-sheet s l 'ail-mes Cowlekg Patented Dec.. 8, 1931 JABIIES T.

PNEUMATIC DROP 'appiication ined February a0, 192s. sensi No. 255,770.

This invention relatesto a new and iinprovedplate drop vfor conveying articlesby gravity from an upperstor'yof a building to lower story, the platformv of the drop be'- I am aware that pneumatic drops ofV this general design are well known but all of the drops of this descriptioi'i hitherto known have initially started on their travel either down yor up solely through the force of gravity. In many cases', however, and particularly where such drops are used in newspapers or other printing plants it is desirable'that' they be able to complete their' travel either down or up' in short a period ofltimeas possible and in a shorter period of time than such travel will be accomplished if'the force y In news! paperV plants, it is the'us'ual custom to locate of gravityV alone is reliedupon.

a stereotype room on the 'top floorofthe building so that the fumes incidental tothey making of the stereotypes will not be `distributed throughout the building. It is also customary to place the presses on the rst l or lower floors so that a iirin foundationmay be provided or'the presses which are of a very considerable weight. In order that the newspapers or other printed matter may be inished in as short a period as possible after the presses have been started running; the

1 stereotype plates must be delivered from' the stereotype room to the press room with ex V f o n a lower Hoor.

treme rapidity.

ln order to accelerate the movement ofthe drop platforinboth down and up I have constructed a device, the main object of which is to `provide a `nieans whe'i'rebyV the initial movement of the carriage is assistedby a supplementary force whereby the timel of travel of the carriage both upandl down will be materially lessened. J

Another object is to provide a cushioning means whereby thel stoppage of the carriage at "each end of its-travel will be eushiorfied against a sudden shock, l

Another object is to' provide a ineanswlierel bythe unloading of the carriage may be ao-V complished speedily. Other objects and ad-` vantages`relate to the size, s'hap'e'and ar! rangement of parts all as will more fully appear from the following description taken in connection with the 'accompanying drawings vin Whiclu; Figure l is an elevation of my device i'nu stalled in a building showing the walls and oors or" the building in section.

Figure 2 is a vertical section partiallyin elevation through the top station vof the drop showing the carriage in position at such station. Y

Figure 3 isa vertical section partially'vin elevation through the: bottom stationof the drop showing in dotted lines the carriage. inv

position at'such station.

Figurei is atop plan of the bottoni por'- tion of the carriage on lines of Figure 2. Figure 5 isla top plan view partially in section of the b'ottomstation of the drop. lvFigure 6 is a perspective view of a stereotype plate which is to be transported on my device, and

Figure 'r' is a sectionpartially inelevation online 7-17 of Figure 2.

My device is designed for transporting articles from an upper' story cfa bl'iilding* to a lower story but for the purpose ot eX. plaining the functioning of my apparatus' I' havehere shown `a structure which so far as the carriage itselfis concerned is designed for.l the transportation of stereoti' e lates i P from a stereotype room on the upper floor of a'- printing establishment to the press room My'de'vice is installed inan'open and nobstructed well -l-j extending from thel upper `:floor Q- tothe press room looi"y provide in well a pair of parallel spaced rails and"-5 eiftending from thetop well 144 to the bot# clined rearwardly from ythe perpendicular from a point just above the press room floor oowLnY, or sYnAoUsE, NEW Yonxnssmnon To THElL-Aivison COMPANY;

or sYnAC'Usn, New Yonne eonronarion or iirassaonusn'r'rs s rot -8- and -9- joined together by rear cross member -10- and a central cross member 1l- A plurality of shafts 12F is mounted on the side rails -8- and -9-' in v 17 and 18, Fig. 7, extending upwardly from spaced relation7 and carry on their opposite ends anged rollers --13- positioned with the flanges on the inner ends so that' these flanges may Yact as guides for the stereotype plate -14- which is semi-circular in cross section when the'same is moved along the rollers -12-.. t

On the outer faces of side members 8 and -9- at approximately their center point I provide a pair of opposed lianged rollersv -15- and -16- (as perhaps may best be seen in dotted lines on Figure 3) which rollers are positioned to engage guide rails -land -5- to maintain the carriage 6 in position during its travel. I also provide on the opposite sides of carriage --6- side braces side members 9'- and -8 respectively and being `joined together at their upper ends byY means of across brace 19 419- carries Va vertically extending rod -20- from the center point thereof. This rod 20- carries on its upper end a piston 21 and this rod 20- has a longitudinal aperture for the reception and retention of cord 22-,for a purpose hereinafter to be described. Cross member l1- carries at the center point a depending rod 23,- whicli has affixed at the lower end thereof a .The upper end of cylinder -25- is otherwise closedv except for an adjustable air cock -'-29 positioned in the top end of cylinder u--25- for a purpose hereafter described. Valve -27- is normally closed so that the supply of compressed air is cut-off from the inside of cylinder -25-. Operatinglever -30 pivotally mounted on the body of valve -27- is positioned against a pin -31- connected with the valve stem, not

shown, of valve -27- so that when arm SO- is moved about its pivot it will bear against pin w-31-- and raise the valve from its vseat to permit the passage of the compressed air into cylinder -25-.

I also provide above cylinder -25- and supported by any convenient meansyas for example a cross beam --32- a sheave 33- positioned to receive cord -22- which cord -22-- is secured in rod V-2O- extending up- Cross brace wardly through rod -20- and through cap -34- positioned on the upper part of the body of cylinder -25-. I also provide a stop member -35- depending from cross beam A26 and extending downwardly adjacent the loading opening 3S- through which` the stereotype plates V14- are delivered on to the carriage -6-.

A cushioning cylinder -37- as may perhaps best be seen from Figure 1) is positioned in well -1- in parallel relation to tracks f4- and -5 and of approximately the same length. The cord -22- extends over and around sheave B3-'and dgwnwardly rinto'the upper end of cushioning` cylinder -37- and carriesonits lower end a plunger -38-g-,-shownin Figure 3. Cushioning cylinder 37- carriesfat both its upper and lower ends a pair of air cocks -39- for a purpose hereinafter to be described. The length ofthe cord 22,--v is such that when the carriage --'is at .fthe upper station floor -2- the bottomofplunger 38- will be approximately. atfthe lower end of the cushioning lcylinder 37-. y y Y The upper station Vat floor `-2- alsois provided with a feeding conveyor -40- of similar construction to the bottom frame 7*- of the carriage -6- as respects the (shafts --12- and is so positioned that Vwhen the carriage -6- is inthe raised position a stereotype plate 14- may pass from feeding conveyor-tO- onto carriage -6-.

The lower station for my apparatus at bottom Iioor -3- (as perhaps may best be seen from Figure V.3) consists of a cylinderV 41- aiiixed to any convenient supporting means, as for example cross beam -l2. Cylinder 41- has its upper end open and is offa size and shape to receive and co-act with piston -`2ll which depends from the under surface of carriage 6-'. A source of compressed air, not shown, is connected through'valve -B- and pipe 411- to the lower end of cylinder lll-1 An air cock 45eis also connected to the lower end of cylinder .-41- for apurpose hereinafter to be described. y

Valve--llis normally closed so that the supply of compressed air will be cut off from cylinder -l1 but I provide an actuating means for valve 4L3- consisting of an operating lever -IG- pivotally mounted on the topofbody 43.- and co-acting with the valve stem, not shown, of the valve, not shown, of valve -43-. I also provide a lever M -pivotally mounted on a receiving conveyor Ll8- hereinafter to be described. The forward end oflever -47- normally extends upwardly and is provided with a roller -50-- The rear end of lever 4:7- extends downwardlyland is connected to the forward end oflever -46- by link -51-. It will be seen that when the forward end o f lever'-,47- is depressed the rear end of The receiving conveyor 4S-f (as perhaps may best be seen from Figure consists of side frames -f and. which carry a series of longitudinally-spacedrshafts 5G- which are the same design as shafts 12 hitherto described. The lever .-iris pivotally i the initial movement of carriage --6-y downmounted at the center' point of a rod -57 whichis positioned transversely of receiving conveyor 4S-f.'

Atthe lower station, Anow beingdescribed, l also providea means for assisting the initial unloading movement of themerchandise being conveyed which in thisinstance consists of a bell. crank -58- pivotally mounted on a rod +59- (as perhaps may best be seen in Figure 5) extending transversely of well -.1--. i I also provide belowbell'crank -58-f a crank -60- pivotally mountedon a second rod -xl-f extendingl transverselyv of well -1- in parallel relation withrod` ew-. I connect thel upperV endof bell crank v--58-V to the Vforward end of crank 60- by means of a link 439,- so that the downward Y movement of crank .-60- through link` -62- will `depress the rearwardly-extending upper arm of bell crank 5S-and thereby cause the dependingarm of bell crank -58.- to be moved 'forward towards and over the carriage -6-. I also provide a1 spring 6B-connected to crank 60el to yieldingly hold the same normally in a raised position.

rEhe operation .of my device is as follows: Vith the carriage G--at the upper station at floor 2-, a stereotype plate'14.--, having' been placed on feedingconveyor -40-,

will move toward welly -el--V and through.

opening e36- onto carriage -6-. As a stereotype plate -l/lpasses on to carriage -6- it will Contact with arm SO- moving the same forward.H This movement as above described will opengvalve -2!-, the further forward movement of stereotype plate lllvbeing stepped by-perpendicular checltplate lextending i transversely of y carriage Valve -.27-. being open a supply of compressed air will be introduced into cylinder -Q5 on the upper .surface of` piston -21- which will force piston 2lout from cylinder -25- and greatly accelerate ward. Then carriage e6-.reaches the bottcm of well-41- the piston 24- Vwill enter cylinder f-41-- compressing the air in the cylinder 4:1- which will act ,as a cushionv for the'stopping of the downward movement of carriage .-6-. Air cock `45 is provided in cylinder 4L-,- so that the compressed air may be allowed toy escapeat the best ratev to accomplish this cushioning action. Ati the same time the downward movement of carriage -6-,- through cord 22` will have raised plunger -v-SS- in cushioning cylinder +37- which vwill compress the air in cushioning cylinder -37- to assist in cushioning the stoppage of the downward movement of carriage 6. Air cocks -39-- in the upper end ofcushioning cylinder -37- are provided so that theV rate Aat which the compressed air may escape from the upper end of cushioning cylinder --37 may be regulated to obtain the best results in cushioning the stoppage of the downward movementl of carriage 6e-1 As carriage -6- approaches the lower station (as perhaps may best be seen from dotted lines in Figure 3) the cross memamanner heretofore described, and will contact with stereotype 414.-, to move the same forward from carriage 6- on to receiving conveyor 4S-1 This Aforward movement .ofy stereotype --14- is also acceleratedy due to the fact that the lower ends of rails -4- and --5- are inclined rearwardly which will result in canting carriage -6-1 so that the rear end of the same will be higher than the forward end and the force ofgravity will be exerted on stereotype 14- to cause movement of stereotype -l'ofi' carriage -6-.

As stereotype .-lLl-- moves on to receiving conveyor -48-4- `its forward end will contactfwith roller -'50- and will depress the forward end of lever iT- which, as heretofore described, willresult in the opening of valve -`-43- andtheintroduction of compressed air into cylinder -4l1-. The compressed air in cylinder '-41 will exert force against the bottom face of piston 2aand in consequencewill greatly accelerate the. initial starting movement of car- It will be understood that the weight of the carriage .--6- and the weight of the plunger #S8-f are so proportioned with reference to each other that when no load is on thecarrf'age -'6`- the weight of plunger 438-- will be greater than kthe weight of carriage-6- so that the latter will be moved upwardly by the force of gravity. Thesetwo weights, however, are so propere tioned that when a stereotype lai--V is placed on 'carriage -6-- the combined weight of'carriage and stereotype 14 will be greater than the weight of plunger *38% so that the loaded carriage will move downwardly through the force of gravity.y i e upper movement of the carriage. AAir cock -29-A is provided in the upper. endof cylinder so that the rate of escape of the air so compressed maybe regulated toob tain the best results in the cushioning action; it the same time the movement of the plunger -38-,M downwardly will compress the air in the lower end of cushioningcylinder -37 to assist in the cushioning of the stoppage of the upper movement of carriage Air cocks u-39- are provided in the lower end of cushioningl cylinder so that the rate of escape'of the air to obtain so compressed may be regulated the best cushioning result. Y

The height of roller -50- above receiving conveyor -t8- is such that when stereotype -ii has engaged roller -50 andl depressed the forward yend of Alever aT-4 in the manner just 'described stereotype lawill continue to inove forwardlyover roller and pass beyond the' same permitting lever'H-i to return to the normal or closed position. 1 'Y lt will be apparent that stereotype 1- might move forward on feeding conveyor iO- at a time when the carriage "t5- was not in position to receive it. In: order that this may not happen l provide the meinber m535-. hitherto mentioned which conssts of a stop member slidably mounted in a carrying member 66; which is supported from .cross beam -26- Stop nember M65- is normally in the down posi-` tion indicated in dotted lines on FigureZ at which time itwill be inl the path of movement of stereotype 14- so that the same cannot move forwardly oil from feeding con-V veyor-iO-. Movable member -65- car-r ries an outwardly extending flange- 67- disposed inthe path'of movement of a pin -6S- carried by side member iS- 'of carriage -G- so that when carriage 6- reaclies the upper station pinl` 68 will Contact with flange -67- and will move member 65- upwardly. and out of the path of movement of a stereotype -llto permit the forward movement of stereotype llil on to carriage -6-.

' It will be understood that although I haveV shown and described an apparatus which in the form of its details is'particularly designed for the transportation of stereotype plates such as are shown in Figure 6 yet the details of my structure can be modified to co-act with merchandise of other sizes and shapes and for transportation either up or down without departing 'from the spirit of y my invention. It would also be understood' .that various means may be used for lexert-4r f ing the pressure of the compressed air against the carriage at either the top or botto1n` position of vthe same. For example, it will be entirely feasible to have the pistons described iXed at the top and bottom of the well with cylinders carried on the top and bottom of the carriage. Other modifications might also be made by which this pressure of air against the carriage for accelerating its initial'movement would be accomplished, for although l. have shown and described a specific structure and form of part as an exemplication of an embodiment of my invention l do not desire to restrict myself to the exact size, shape and relation of parts as'various changes may be made within the scope of the appended claims.

^ l/Vhat I claim is:

l. 'ln 'a device of the classdeseribed, a vertically movable carriage, a counterweight co-.acting with the carriage, a piston carried onthe upper partof the carriage, a cylinder positioned at the top point of travel of the carriage and adapted to coact with the piston, a source of supply of air under pressure, an automatic means for introducing air under pressure into theinner end of the cylinder whereby the piston is lforced outwardly from the cylinder.

2. ln a device of the class described, a vertically movable carriage, a counterweight coacting with the carriage, a piston carried on the under part ofthe carriage a cylinder positioned at the bottom point of travel of the carriage and adapted to coact with the piston, a source of supply of air under pressure, an automatic means for introducing air under pressure into the inner end of the cylinder whereby the piston is forced outwardly from the cylinder.

3. In a device of the class described, a vertically movable carriage, a counterweight coacting with the carriage, a piston carried on the upper part of the carriage, a cylinder positioned at the top point of travel of the carriage and adapted to coact with the piston, a second piston carried on the bottom part of the carriage, a second cylinder positioned at the lbottom point oftravel of the carriage and adapted to coact with the secondy named piston, a source of supply of air under pressure, automatic means for introducing air under pressure into theinner end of the iirst named cylinder when the first named piston is positioned in such cylinder, and additional automa'tic means for introducing air under pressure'into the inner end of the second named cylinder when the second named piston is positioned therein. y

t. ln a device' of the class described, a vertically movable carriage, a'counterweight co-acting with'the carriage, a piston carried on the upper part'of the carriage, a cylinder positioned at the top point of travel of the carriageand adaptedto coact with the pis-Y tonf,a source-'ofsupply of air under pressure,

automatic means for introducing air under pressure into tlie'inner end of ther` 'cylinder wlierebythe piston is forced outwardly from the cylinder, and means for "automatically Vstoppin g such introductionof` airunder' pressure.

5. In a device of the classdescribed, avertically movable carriage,a counterweight coacting with the carriage, a piston carried on. the under part of the carriage, a cylinder positioned atthe bottom point oft'ravel of o acting with the carriage, a piston carried on theupper part of the carriage, a cylindervpo sitioned at the top point of travel of the carriage and adapted to coact with the piston, a second piston carried on the bottom part ofthe carriage, a second cylinder positioned at the bottom point of travel ofthe carriage and adapted to coact with the second named piston, a source of supply of air under pressure, automatic means forV introducing air under pressure into the inner end of the first named cylinder when the irstfnamed piston is positioned in such cylinder', additional automatic means for introducing air underpres-` a sure into the inner endot the second 'fnamed cylinder when the second named piston is positioned therein, and independent means for automatically lstopping such introduction of air under pressure. e Y

7 In a device of the class described, a vertically movable -V carriage, automatic means for placing on thecarriage an article` to'be transported thereon, a counterweight coacta ing with the carriage, apiston carried on the upper part of the carriage, acylinder positioned at 'the top point of travel of thecarriage and adapted to coact with the piston, a second piston carried on the bottomlpart of the carriage,a second 'cylinderpositioned at the bottom point yoi? travel of the carriage and adapted to coact with'the second named piston, a source of supply or air under pres# sure, automatic means' forr introducing air under pressure into lthe inner en d of the first named cylinder when the kfirst named piston is positioned in suoli cylinder, and additional automatic means for introducing airfunder` pressure into the inner en d of the second named cylinder whenthe second named pis? ton is `positioned therein. `1

8. In a device of the'class describecha ver`y tically movable carriage, automatic meansfor placing on the carriagean article to be transported thereon, a counterweight Acoact ingwith the carriage, a piston carried on the upper part of the`carriage',"a cylinder posi# tioned atthe top point of travel of the car'-` riage and adapted to coactwith the piston, a second piston carried on the bottom partv of the'carriagea second cylinder positioned at the bottom point of travel ofthe carriage and adapted to coact with the second named piston, a source ofsup-ply of' air under pressure, automatic means ,for introducing air under pressure into the inner end of the first .named cylinder when the first named piston is positioned in such cylinder,'additional automatic means for introducing air'under pressure intd'the inner end of the secondnamed cylinder when the second named piston is positioned therein, independent means for removing such article rom'the carriage after the transportation of the same has Ybeen completed. 1 v f 9. In a device of the class'described,`a vertically movable carriage, a' source of supply of fluid under pressure, automatic means for directingsuch fluid against the carriage when the latteris in the top position only during the initial downward movement of the carriage. Y,

l0. In a device of the' class described, a

vertically'movable carriage, a source of supply of luidunder pressure'automatic means for directing suoli Huid against thecarriage when the lat-.ter is in the bottom position only during the initialupward movement of the carriage. .y j

Il. In a device` of. the class described, a vertically movable carriage, a source ofsupply of fluid under pressure, automatic means whereby only the initial downward movementv of the carriage is accelerated by such luid imder pressure, and ladditional Yautomatic means whereby onlyfthe initialupward movement of the carriage is accelerated by such fluid under pressure. A i

12,.` In a device of the class described, a well extending between floors of a building, a vertical track in said well, a carriage vertically movable along said track, a counterweight vcoacting with the carriage, apiston extend# ing upwardly from the upperpart of the carv riage,y a second piston extending downwardly from thebottom part ofthe carriage, a cylinderfhavingoneopen end adapted to coact with the first named piston and positioned at the top point of travel of the carriage, a second cylinder having one open end adapted to coact with the second named piston and positioned at thebottonipoint of travelof thecarriage, air cocks in the closed ends of said cylinders for'permitting the gradual escape-of air when a piston enters a cylinder,

' a source of supply of air under pressure, automatic means/for delivering such air to the closed end of the firstpnamed cylinder when* the piston on the upper part of the carriage Ais positioned in said cylinder, and additionall automatic means for delivering such air to the kclosed end ofthey second named `cylinder when the piston on the bottom part of the ycarriage is positioned therein.

` 13. In a device of the class described, a vertically movablecarriage, a. source of supply of fluid under pressure, automatic means for directing such fluid against the carriage when the latter is in the top position only during the initialdownward movement .of the carriage, such automatic means being actuated by the load toy be Ycarried byr the carriage when'said loadV is moved onto the carriage.

14. Ina device of the class described, veri tically movable carriage, a source of supply of fluid under pressure, automatic means for directing such fluid y against the carriage when the latter isin the bottom position only during the initial upward movement of the carriage, such automatic means being actuated by the load being carried by the carriage when such load moves of from the car.- riagei.

` 15. vIn a device of the class described, a vertically movable carriage,'a source ofsupply-of fluid under pressure, automatic means actuated by the load to be carried when the same moves onto the carriage for directing such fluid against the carriage when the latter is in the top position only during the initial ldownward movement ofthe carriage, and additional-automaticI means. actuated by such load when the same movesv off'l fromv the carriage for directing such fluid againstthe carriage when the latter is in the bottom position only kduring vthe initial upward movement of the carriagelf, l

16. In a device of the class described, a vertically movable carriage, a source of supply of fluid under pressure, automatic means at one end'of the travel of the carriage actuated by the load to he carried when the same moves onto the carriage for causing the pressure of the fluid to be exerted on the carriage only during the initial movement of the carriage, and additional means at the other end of travel of the carriage actuated by the carried load when lthe same moves oli from the carriage for causing the pressure of the fluid aA means for compressing a fluid at one end of the car path,`and means wherebya `compresslble fluid may be expanded to give the car an initial acceleration away from that end of they-path.

Apparatus of the class described comprismg av car moving upwardiy `andwdownwardly" along a predetermined path, a`

counterweight connected to the car, whereby the latter whenvloaded tends to move downwardly and when unloaded tends to move upwardly, shock absorbing means including a means for compressing a fluid at one end of the car path, and means whereby a compressible fluidmay be expanded to give the car an initial acceleration away from that end of the path, which means are automaticallyactuated by the load as it is removed from the car.

,20. Apparatus of the class described, coinprising a car moving upwardly and downwardly along 'a predetermined path, la. counterweight connected to the car, whereby the'latter when loaded tends to move downwardly and when unloaded tends lto move upwardly, means carried by the car, and means at one end of the car path adapted to co-act with saidcar carried means to decelerate the movement of the car upon approaching the path end and to accelerate its movement'upon its leaving that end.

21. Apparatus of the class described, comprising a car moving upwardly and downwardly along a predetermined path, a counterweight connected to the car, whereby the latter when loadedtends to move downwardly and when unloaded tends to move upwardly, and lmeans adapted to decelerate the movement of the car upon approaching one end of the path and to accelerate its movement upon its leaving that end, said means including a piston carried by the car and a cylinder adapted to receive the'piston at that end of the path, and means for admitting compressed air to the cylinder to accelerate the movement of the' car away from that end. 22. Apparatus of the class described, comprising a car' moving upwardly and downwardly along a predetermined path, a counterweight connected to the car, whereby the latter when-loaded tends to move downwardly and when unloaded tends to move upwardly, and means adapted to decelerate the movement of the car upon approaching one end of the path and to accelerate its movement upon its leaving that end, said means including a piston carried by the car anda cylinder adapted to receive the piston at that end of the path, and means automati- Lso cally actuated by the load as it is placed upon the car for admitting compressed air to the cylinder to accelerate the movement of the car away from that end. Y-

23. Apparatus of the class described', comprising a car moving upwardly and down-y wardly along a predeterminedpatlnacounterweight connected to the car, Vwhereby the latter when loaded tends to move downwardly l and when unloaded tends to move upwardly,

ed to receive the piston at that end ot the.

path, and means automatically actuated by the load as itis removed from the car for admitting compressed air to the cylinder to accelerate the movement of the car away from that end.

24:. Apparatus of the class described, comprising a car moving upwardly and downwardly in a predetermined path, a-counterweight connected to the car, whereby the latter when loaded tends to move downwardly and when unloaded tends to move upwardly, and means to decelerate the movement of the car upon approaching the upper end of its path and to accelerate its movement upon leavingrthe same, said means including a piston carried by the car and a cylinder adapted to receive the piston at the upper end of its path, and control means `for admitting compressed air to the cylinder to give initial downward acceleration to the car, said last-named means being automatically actu- Y able in response to the loading of the car at the top of its path.

25. Apparatus of the class described, comprising a car moving upwardly and downwardly in a predetermined path, a counterweight connected to the car, whereby the latter when loaded tends to move downwardly and when unloaded tends to move upwardly, and means adapted to decelerate the movement of the car upon approaching the lower end of its path to accelerate its movement upon leaving that end, said means including a piston carried by the car, and a cylinder at the lower end of the plunger path and control means associated therewith for admitting compressed air to the cylinder to `give initial upward acceleration to the car, said control means being automatically actuable in response to the removal of a load from the car` when the latter is at the lower end of its path.

26. Apparatus of the class described, comprising a car moving upwardly an-d downwardly in a predetermined path, a counter- 1 weight connected to the car, whereby the lat- 'A preaching the path end and to accelerate its movement upon leaving the path end, said v means including pistons carried by the car and cylinders located at the ends'of the paths of the pistons, and control means associated with the cylinders for admitting compressed air to the same to give initial acceleration to the car, said control means being automatically actuable in response to the loading of the car at the upper end of its path and in response to the unloading of the same at the lower end of its path.

27. An apparatus of the class Y described comprising a vertically movable carriage having anupper station stop and a lower station stop, means for moving said carriage vin one vertical direction, and additional means at each of said stops for automatically decelerating the lcarriage upon its arrival and givingto the carriage an initial movemen upon its departure away from the respective stop stations.

28. An apparatus of the class described comprising a vertically movable carriage having an upper station stop and a lower station stop, means for moving said carriage in one vertical direction, `and additional means at each of said stops for automatically decelerating the carriage upon its arrival and giving to the carriage an initial accelerated movement upon its departure away from the respective stop stations. I

In witness whereof I have hereunto set my hand this 6th day of February 1928.

' c JAMES T. COWLEY.

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