US2482367A

US2482367A - Trench jack

Info

Publication number: US2482367A
Application number: US26551A
Authority: US
Inventors: Jr Jerry J Ravers
Original assignee: HARRY K NYBERG; WILLARD D KNOX
Current assignee: HARRY K NYBERG; WILLARD D KNOX
Priority date: 1948-05-12
Filing date: 1948-05-12
Publication date: 1949-09-20
Anticipated expiration: 1966-09-20

Description

Paten'ted Sept. 20, 1949 .f1-his inventin relates to." prvementin jerks' .for .use in tr enche s, ditches and similar excavajtions, for cribbingup .the wallsand ,preventing crumbling and collapse thereof.V .L

. The primary object of the invention istopro-- ...vide a. comparatively 1- Simple. .and light-but Very Ystrong device which may be collapsed for insertion into the trench and then .expanded to'bear outwardly onl the walls-thereo f, or press. .c rlbbing boards to thewalls to prevent their collapse.

'.Another object is `to provide a device of this kind which maybe loweredinto the trench from the ground surface and adjusted to place without j requiring that the workmen enter-the trench.

Thus.. all adjustments and installation being carried out from the side f; A the trench where the workmen are safe;

vstili another object iste provide a device of this nature having provision forconventional Vextension in length according to the depth of the trench. l .Y f l These andother more detailed and specific 0brjects willbe .disclosed vinthe courseofthe following specication, reference being khad vtothe .accompanying drawings, in which- A .faleigv -lis a. plan'vew of a sectionof trench cribbed andeprotected Vby two of the; units making .up rnyinvention. v Fig. 2 is an enlarged vertical. Acrosssection through theA trenchand .cribbingx A iFig.. 3 a, .fragmentary hor1zontal sectional fview along the line.3-'3 in Fig. 2;

. Fig. 4 is a detail View of extension sections Afor the pull rod and sides of the trench-jack.` Referring now moreparticularly` and by reference characters to the drawing A designates genera1ly;a trench .j ack of my invention (two of such being shown in Fig'. 1) andit includes a center'or hanger frame or supportingv` means comprisingfa channel I supporting turret bars -I Ifwhichsangle upwardly Vand at their apex yI2 v.forma vertical -bearing for an adjusting baror-pull rod I3.- Cross rods I4 also join theV flanges of thechannel I0 near their ends and this assembly-:may be'conveniently'.fabricated-by welding the parts together. The pull rod I3, however, may turn in its bearing at the apex I2y and its upper end is threaded :to accommqdate vthe threadedV hub. Iof a `hand wheel l5 positioned abovel thesaid-apex .'.Applieat'ixiMay 12, 194s, SiiaiNO. 26,551.Y

' raoiaims. (o1. 254-126) pins or cotter keys 20. At vertically spaced points 'the side bars It havelrigidly affixed, inwardly f .turne'd apertured`-ears 2 I to which are pivotedlat 4 22 thefouter ends' of.inwardly extending toggle .links 2 3. These links are also made ofchannels with the Webs cutaway andV extensions .applied thereto so that lthefin'ner ends 24 of the'links may cross,v one cut-awayfshown at 25 in Fig.y Bbeing of such width'as 'just to accommodatev the pull rod I3. These crossing inner ends 24 ofthe links are pivotally connected toeach other and tothe pull -rod by pins 26. A plurality of rrenii'igsy are provided in thelinks, as Aseenfat 21, for the pins .26'so that the effective `length' Iof the toggle links,

and therefore thespreadof'tle side bars Imay be adjusted. 1 Rollers28 Aare journaledbetween the up'per '.end'soffthe' flangesffof Vtheside bars I6 to roll againstthe underside ofthe channel I Il,

In use for temporarily 'snoring or cribbingV a trench such as shown at'B the trench jacks A are spaced along the length of the trench as may be required andwith the sidebars I6 pulled inward and `spaced from theY trench sides roornis 4providedI by which cribbing boards C may be dropped down at each. side. These boards come 'to rest.

on-and aresupportedfbyfstop.pins 28 extending loutwardlyfrom the side barsnfearthe lower ends. .'I'he hand wheels I5 are z now turned vto pull the pull rod I3 kupwardly-.and l t l'i i s .niotionftends.to

straighten out thetoggle vli'nl'; s.23,. with the result v that the side.. bars Ilfare thrust outwardly and Vpowerfully against the sides .o f the trench forcing the` boards O tightly thereagainst. When the cribbing isto be removed the hand wheels are, ofV course, .turned `'oppositely `to pull. in the side bars .as willbe readily understood.

It will be noted that the jacks may be yand lowered into or removed from the trench by lworkmen standing alongside the trench,` .the

rods lserving asconvenientfhandles in the process. Thus it is notnecessaryfor the men to enter the j trer 1 chiv wherey they maybe exposed to the dangers of cave-ins, asis the .ca se'now in installe Ving :presentday trench jacks.

.Each trench jack preferably consists of a .com vparativelyv short basic unit such as shown in Fig. 2

andfordeepertrenches provision is made for .the additionof sections I Saandjldtogthe pull-red -I 3 and side .barsl 6 asmay be. required. For this purpose the lower bracket ears 2I have also de:- pendingiapertured lugs 13D-'to which theLupper apertured ends of theisections Ia may bepinned while ,the addedsections [3a of the.p11ll. rod may ;be' atta'chedby. the pins 26.17.0bviously', the extra 4sections.willfhave toggle links 23 are'required and ai jack- Iof;- any .necessary length may. be .quickly set up in this fashion.

It is understood that suitable modifications may be made in the structure as disclosed, provided such modifications come Within the spirit and scope of the appended claims. Having now therefore fully illustrated and described my 1inventicn, what I claim to be new and 'desire "to protect by Letters Patent is:

1. A jack of the character described for bracing apart the sides of an excavation, comprsinghlde members and togglemeans for moving theV side members apart and toward'thesidesof the'tfreriel'n and supporting means and operating means lorf.

the side members and toggle means, said supporting means being adapted to span thefsifdeslof the excavation.

2. A jack of the character described 'orbrac'ing apart the sides of an excavation, comprising side 4members and toggle means 'for moving the side members apart and 'toward'the sides of the trench, and lsupporting means and operating `means "for the side members and toggle means, said "support- 'ing means being radapted *to vspan 'the sides of the `excavation and having handles `by `which the jack maybe rlowered into 'and removed from the 'excavation from `the top sides thereof;

"3. Afjack of the character V'described for braclng apart lthe sides of `an excavation, comprising side members andtoggle means for moving the vside vmembers apart and toward the sides of the trench, and a supportingmemberadaptedto span the sides `of Vthe 'excavation and support the side `members inthe excavation Vas they are adjusted therein. 1 f

fl. Ajack of the character described for *bracing apart the sides of an excavation, comprising side members and toggle means for moving Vthe side members apart and toward the sides ofthe trench, and-a supporting lmember adapted to span the ysides of an excavation `and support the side vvmembers inthe excavation as they `are adjusted 'thereinandihandles-at theends of Ithe supporting ymember :for -manipulationoftne jack by workmen `stationed alongside the excavation.`

l5. In a trench iackof lthe character-described, Y

a 'supporting channel having an elongated slot, 'side 'bars depending below the channel and hav- `-ing `meansextending upwardly through and slidably and supportably engaging the'edges ofthe slot, and toggle `mechanism for moving A'the side bars toward and `away from eachother. 46. ln a trench jack of lthe character described, :a supporting channel having an elongated slot, side -bars depending below the channel and having means extendingupwardly through and slidably and -supportably engaging the edges of the islet, toggle mechanism'for moving the side bars Ytoward and away from V'each other, androllers on Ythe upperends-of the *side 'bars for upwardly engaging'the undersideof thechannel. A

na trench jack of the `v'characterdescribelil, 'a supporting channel having an el'ongatedslot,

side bars depending below the channel and havslots, and toggle mechanism connecting the side bars and operative to move them toward and away "from each-otherg'said toggle mechanism comprising a pull rod depending down through'the channel between the side bars, toggle links pivoted at opposite ends to theside bars and the pull rod, and. a hand wheel threaded on the upper end of the pull rod and operative to move it axially for actuating the toggle links.

5'9. In-a trench jack of the character described, a Supporting channel having an elongated slot, sidebar-@depending below the channel and having pins kat their upper ends slidably extending up 'through'the slot, washers held on the upper ends of the pins and overlying the margins of the slots,

Vand tegglemeehanism connecting the sidefbars vaway v#from eachother, toggle mechanism ineluding toggle 'links and-la pull rod for so adjusting the side bars, and :extra `sections for -sus'pension and connection from the side bars and -pullrod vfor increasing the=`length-of the jack according to `the-depth fof the trench. 1

1,1. In a trench jack of the character described, upright side f-bars, `niechal'ii'sm for spreading V-the 4bars against-thefsides of a treneh-,.means;operatve to span the '.ftren'ehfand suspend the 5ba-rs therein, and said spreading mechanism including amantially-operativezmember positioned above the level of the trench sides 'when-Stile jack `is suspended in the trench.

Y 12. In a trench ack .having .members for engaging the .sides orf Vthe trench and emechanism for :spreading fthe members .against the trench sides, the improvement which consists in `asupporting member-fr lthe jack which `is operative to span the upper ledges of 'the trench andsus- :pend :the jack therein, and ameinber for operating said spreading mechanism .so located on :the

'Jack `that it .maybe reached .from zthe yupper VVedges :spreading the lmembers .against the trench sides,

.the :improvement iwhich Vconsists in a .supporting V:member-fior the. iack which is operative to span vthe vfupper edges `of :the .trench and :suspend .the Ajack therein', and `a ehand i Wheel foperatively -connected to saidispreadingmechanism and :located Dn Y said :Supportingfmember for foperation from alongside the .trenchi JERRY .J. RAVERS, .J n.

FREFERENOES 4CITED The following references are of record in the iile tof this patent:

UNITED .STATES PAfIENTS Nmnber .Name` Date 500,757 l(Toit-etal. remmh July 4, '1893 v909,808 .Laughterback is Jan. 11.2, IQUQ :7o l figc-38,859 Knowles Aug. 16, -192'? 1;640A11 .Jackson sereine- Aug. 30, 11927