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Publication numberUS1488406 A
Publication typeGrant
Publication dateMar 25, 1924
Filing dateApr 19, 1920
Priority dateApr 19, 1920
Publication numberUS 1488406 A, US 1488406A, US-A-1488406, US1488406 A, US1488406A
InventorsJames Morrison
Original AssigneeTrailmobile Company
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Semitrailer jack
US 1488406 A
Abstract  available in
Previous page
Next page
Claims  available in
Description  (OCR text may contain errors)

Marjch 25, 192.4. 1,488,406

J. MORRISON SEMI'Z'RAILER JACK Filed April 19. 1920 A/ZU/F Patented Mar. 25; 1924.

UNIT ED S'T A T ES To all whom it may oon'be'vm:

i selni ti'ailer J asks, ofWhich the following.

a full, clear, and 'elx'eotf description, refer v e drawings forming a hand threelded. A

ence tbeing had to' 't r iem'htfailezf's and more panticnlarly to mechaa vehicle.

M 1 1111 semi tmi'ler 'vehiolee; wl l'ei'ein the serni trailer is snpported j at'ite fol waifl'endjuponQ the tractor, it is en eXtif /mlj 's seiltjiali' partf 9 the? e a i m t qh rqv de f ifiei it f means of maintaining the f1'"Qnt'ei1d- 0ffthe fltralilei' in elevated position: When tractoi' h s been drawnput'iibm beneath it;

A c i g hei 'fe ib le i n ploy astheijaekelementsofthe devie'exa paip I R I I PE' VidQ-fOI'Ylnnfizontalsiippditing ofth'eveail m t t h 'n tfi i d' with i edflegs Tforj w t ct wit h ppl t- 5 ingesui'feeeibnt itis to the meehenis ln'pro-f, f-"vided. for swinging the 'jaclgil'egs" upwardly" of screw jacks the 'upper: ends attaehed1 to the? to provide for operitionfrom'elthelf side of" M v M llnes 'of-the vehlolegthe shaft is equipped 'the Vehicle.

-'efter more specifically pointed but" and:

' claimed.

' 1 In the drawings,

7 jack raising device.

Figure 2 is a gene'ml'view in elevaffic Figure 3 is a detaillongitudinel section? illustrating the ratchet 'meehani'SIn in a simpler" form. Figure l is a'demfl elevation of the parts shown in Figure 3.


i mechanism is m'ere1y thesele'ctedone for- The jack whichjis usedf'with my lifting pmpose's' of "illustration, astheme'ehanism oni theii hinges; 'that' nay" invention 'in' this OIiIdKbe readilyBidet)Qtedi fonthevraising of Be it known that I, 'J 1\Ins l\0RR;rson, a] V citizenof the United States; end ztie'sident j of the city of- Qincinnatiyin the'eounty of l lamiltonhnd .Stateof' Ohio, haye in' ented' *oei tain new ,an'djnse ful 'lniproveinelitsn in" any kind of jeck dev'ices are supend- "bers'2,'inwhich are setthe'jack'serews j The ,sc rewsn Vane T operated ;by., meainsfllof any sulta ble pawl end retehetfdevice', 'ntilizing operitingl handles 4, and; are right "@1101? left l The: loiiver j 210k here .5;

equipped; with legs 1 6,.jhinged1'thei etd 'at 7,

of ddgsS e e V f z h g i e u p ed wit t 4 9", which glo not permlt'fof lfeyol'l l tionfofjthe' legs, and when the lofztd is supported on fthe ifeet and "Sillt will be a thiiist 'eicert'edjageinst ol'il re- Jagg d t ward the lqad, e is 1 0 e t -11 ili iimay b ted y it' r by han was e-tom 'k'q P el inary djustnent's thefeof $101 95. tliejsdr'ews; aniiisb igs to feetLw Across; thprailer heme, re r'a ly m. the rel. owe jeksisiio mled;'by;..m@s f 12, a; {s1i detb1e and {rotatable shaft 13. i At interspaeed' points inside of the frame we. @R i ffi m df re ksl alt the outer ends of which are hooks l for 'Qen'gagingfthelifting eh'zjihs. D11 e':to' the fact thet thegjaeks readily rotete when the 1021,51 is 'relie ved5 "the Ieg'ban be 7 lifted f in-v "wai'dly and niifivirdly of theframe, thereby niovingthem entirely out of the'way.

p lish this lifting in, a very eflicient-Inehner,

Tincethe" firslt qualfterftu'r'n of the shaft provideS a1 'oonsidefable motion of the. Hinged legs," Withthe pnll ex' erted 0n aline sub- "stalntia'llly o f the sameercjasthe are of movement of the legs. Continlied 'sh gifti ie'volu- 'etion then Windsthe lroh'eins up on the shaft;

with no chalnce Of "the 'oh'tiin' slipping off', as


jandiloekedin' opei ativefpositionby fneans V "on a reel, and with the even wrapping of side of its end, and the ends'of the shaft the chain insured due to the slantingline of pull. r r Furthermore the shaft may be provided Wil/h an operating device on bothends therei of, so as to make it operable from either side of the vehicle.

jThe braeket journaling device at one side of the vehicle is provided 'withadisk portion 16, cut with radial facial teeth 17. The

operating handle18 at this end of the shaft is secured fast thereon, and is provided with a like disk 19, having facial teeth 20.

' The other end of the shaft is provided with a rigid-handle 21", properly located inare both equipped with loosely mounted hand hold sleeves 22, held in place between the operating handles and terminal 001- lars 22 7 Located on the shaft insideof the trailer frame is a fixed collar 23, between which and the frame is mounted a spring 2&. This spring tends to draw, the shaft in a direction to cause fameshing between the facial teeth of the two disks.

v A pull on the one hand hold or'a pres sureon the other will' overcome the action of the spring, and permitthe shaft to'turn, as soon as the two disks areforced out of mesh; The spring will give in the operation of the handleson the shaft, to permit ratchet action, the sloped faces. 7

teeth having suitably In operating the raising device, the hinged legs of thej'acks are first freed of the load,


7 As can be appreciated the raising of the jacks toward the center ofthe trailer 00-;

operates with the screw type of the jack to handle 18 is the same as the handle 18 andmake a simple and effective mechanism, which permits the jacks to be" lifted out of the way vtoward the inside of the, trailer frame, and entirely withdrawn andjwith the chainswound overashaft, and not a reel.

A considerably 'simpler form'of ratchet.

device for operating the shaft 13 is shown in Figures3 and i, wherein the rigid member 16 that is mounted on the trailer frame corresponds to the member '16 hitherto described.v

" The difference is, however, that the teeth 17? for thismember are V-shaped. The

is likewise pinned to the shaft 13 and ear- I ries toothed plate 19. i r t a The teeth 20 however, are also V-shaped v 55 so as to mesh with the teeth 17?.

In this construction the hand hold'mernbers 22 are entirely omitted, and in raising,

and lowering'the jacks the handle l8 must be manipulated. I

The spring 24 is of sufficient strength to hold teeth 17 and 20 in meslrwhen the jacks are raised.

' When the'han'dles on"either end ar'ema- I :nipulated, however, the teeth will snap on of mesh without excessive vresistance.

Thus this device is considerably simpler in form,although it is not so positive a lock nor so rapid in operation when'it comes to,

loweringthe jacks V r 7 It will be understood that theparts described areillustrative of my invention and not intended as bounds whereby the scope of my invention is ,to be limited. 7 r

Having thus described my invention,

what I claim as new and desire to secureby Letters'Patent, is; o V

l. A device for swinging up the jacks in. semi-trailers, comprising a shaft, elements extending from said shaft intermediate its ends, flexible connections from said elements, to the jacks, with said elements located with reference to the jacks, such that'the flexible elements wind up on the shaft, outside of the extending'elements.

2. A device for swinging up thejacks in semi-trailers, comprising [a shaft, elements extending from said shaft intermediate its reference to the jacks, such that the flexible elements wind. up ontheshaft, outside of the extending elements, andmeans' for ro- -tating' the shaft from eitherend thereof} '3. A device for swingingup the jacks in semi-trailers, comprising. a shaft," elements extending from said shaftintermediate its ends, flexible connections from said elements/to the .jacks, with said el'em'entslocated with reference to the jacks, such-that the flexible elements wind uponthe shafts,

outside of the extending elements, means a v for rotatingthe shaft from either end thereof, a ratchet lock for the shaft, and means. at either end of the shaft for releasing said :ratchet. r v g p 4. A device for swinging upthe-jacks in semi-trailers, comprising. a shaft I-mounted on the vehicle, elements extending from said ends, flexible connections from said elements to the jacks, with said elements located with shaft intermediateits ends, flexible connections from said elements to the jacks-a fixed toothed member on thevehicle, a

matching toothed member on the "shaft, 7

means for resiliently mounting the shaft on the vehicle, so as to vslide with reference thereto, and means loosely engaging the shaft and serving for manualengagement toshift the shaft slidably, thereby releasing the engagement of said disks.

a semi-trailer, comprising a shaft mounted V 5. A device for swinging up the jacks in across the frame of the vehicle, a pair of arms on the shaft located within the vehicle frame, operating arms for the shaft located exteriorly of the vehicle frame, and flexible connections from the inner arms to the jacks, for the purpose described.

6. A device for swinging up the jacks in a semi-trailer, comprising a shaft mounted across the frame of the vehicle, a pair of arms on the shaft located within the vehicle frame, operating arms for the shaft located exteriorly of the vehicle frame, and flexible connections from the inner arms to the jacks, said shaft being resiliently mounted to slide with relation to the vehicle frame, and means on the vehicle frame to limit the rotary movement of the shaft in one direction, said termediate the shaft and the vehicle frame,-

means for resiliently holding the shaft in ratchet engagement position, and hand holds on the shaft for moving it away from ratchet engagement position, while permitting free revolution of the shaft.


Referenced by
Citing PatentFiling datePublication dateApplicantTitle
US6726247Mar 26, 2002Apr 27, 2004Leon J. SnyderMethod and apparatus for retracting a support leg
US7789425 *Oct 26, 2006Sep 7, 2010Paul HanscomTrailer stabilizing device and method of using same
US7789426May 19, 2008Sep 7, 2010Paul HanscomTrailer stabilizing device and method of using same
U.S. Classification254/419
International ClassificationB60S9/00, B60S9/08
Cooperative ClassificationB60S9/08
European ClassificationB60S9/08