US1874128A - Jack - Google Patents

Description

JACK

Aug.. 30, 1932. E. J. sl-:FBER

AFiled Jan. 8. 1952 Y hereinafter described. l

Patented Aug. 30, 1932 EMIL J. siiB'ER, lor ciIIcAeo, 'ILLINOIS JACK Application-filed january s, 1932. serial No. 585,569. y i.

The screw'21 is attached tothe Ijaw 20 andl A* This invention relates to certainno velim-` provements in jacks, and has orits principal object vthe provision of any improved construction ofthis character which willbe highly efliicient in use andeconomical in, manufacture. i Y

It is the primary object of this invention: to provide an improved jack of the v(':haracter Other objects will appear hereinafter. The invention consistsA in the novel combination and arrangement of parts to be hereinaiter described and claimed. f 'The invention will be best understood by reference to the accompanying drawingiy showing the Apreferred form o construction and in which: i

Fig. 1 is a top plan view of the jack;l Fig. 2 is a sectionalV view on line` 2-2 in Fig.1; Y f

Fig. 3 is a side elevational'view, on line 3-3 in Fig. 2, with parts broken away.;

Fig. 4 is a fragmentary detail view; and. Fig. 5 is a sectional view on line 5-5 1n Fig. 2.

In the drawing which illustrates a pre-l ferred and practical embodiment of the invention, indicates thefootor baseof thev jack; said foot being attached to the post or standard 11. Movable axially along the j ack Vpost or standard 11 is a member 12, and like-r wise movable axially along the post orfst-and-V ard 11 is a member 13; the member 12 and member 13 being moved axiallyl along'the postv 11 by means of the hereinafter described mechanism. f i

f This mechanism includes an operating lever 14 which is attached to a crank 15 kthat 1- is journaled in the member 12; said crank having an eccentric throw 16 upon which ioats a yoke-3810i avlink V17 which has itsV other end connected to a pin 18 in the memf ber 13.

45t Arranged .adjacent aportionf 19 of the is slidably mounted in al bossy on the por-v tion19.

The member 13 likewise has a portion-27 which extends acutely from the axis of the standard '11, and adjacent this portion 27 is a gripping jaw` 28 that is normally urged slightly away from thev standard 11 by a spring-urged screw 29 that is'similarto screw 21 and which is slidably 4mounted' in 'aboss on portion 27. j Y 'l Y Attached to jaw-28 is a screw 30 upon which is a-'spring"32.k lThe spring 32-is arranged within a `sleeve23 which` embraces the heads of lthe screws 24 and 30. The sleeve 23 has aiange 26 and a flanged member 25 `is slidably mounted on'screw 24.

n lThe springs 31 and 32 urge the jaws 20 and 28 into gripping engagement with the standard 11 (upwardly as seen in Figs.` 2 and 4) i and into' wedging engagementwith the portions 19 and 27. Pivotally mounted on member 12 is a latching lever 22 which has a pair of lingers .33 that are engageable with the a flange 26 of sleeve 23. lA second lever 34 isy pivotally mounted on member 12 and has a cam portion 35 that is engageable with the lever 22 whereby to move the lever 22 into latch'ed position (Fig. 2) and unlatched position (Fig. 4). lVVhenmoved,into latched position the fingers 33 on the lever'22 engage the flange 26 and slide the sleeve 23 np-v wardly, thereby tensioning spring 32, whichtends to draw the jaw 28 upwardly into grippingengagement 'with stand-ard 11. v Up `ward movement of the sleeve 23 bymeans ofthe latching lever' lingers 22, likewise compresses the spring 31 because of the engage.- ment of flange 26-with the flange 25 as the" sleeve 23 is moved upwardly, and the jawk 2O is therefore likewise urged upwardly into gripping engagement with standardV 11., rFhe parts being in latched or lifting posi` tion,`as in Fig. 27 and the load bearing, relative to standard 11, on member 12, downward movement of operating lever 14 exerts an upward'pull' on member 13 and jaw 28 by reason of the eccentric throw 16 and link 17.rv `As the member 13 is moved upwardly the weight4 of the load, relative t0 standardll, is shift-A the load, acting through the portion 19 01? member 12, forces the jaw 2O into holding engagement with the stand-ard 11 while at the same time, sincethe weight of the load isfshiiited from member 13 to member 12, the

jaw 28 is released troni holding engagcmfm? withV standard 11, permitting the member 13 y tojbe'moved upwardly when the operating lever 14 is again moved downwardly. Upon the next downward movement oit' operating lever 14 the weight or bearing reaction. of hGflQad, relative to standard 11, is again transferred from member 12 to. member1,3.A

which, acting through portion 27j, forces the jaw 28into holding engagement withstandard 11.` During each of these operationsk of shifting the i load, relative to standard V 11, from member 13l to member 12 and vice versa,

the compressed springs 31 and 32 keep the jaws 2O and 28 ingrabbing contact with the standard 1,1.` Y The' parts` are arranged in unl-atenedposition injlfig.V 4 wherein it will be seen Vthat the lever 34V has manipulated thevlever 22,

eounterclockwise from the position of lever in Fig. 2, thereby relieving tension on spring 32' which has forcedy the sleeve` 23; downwardly into engagement witvhyjlaw 28V while at the same time the tensionV on spring 3 1 is relieved, The jaws 2O and28 are,theres` fore, now urgedby the adjustable springs 35 and 36, on screws 21 and'29,V slightly away from the standard 11 so thatl ythe members 12wandf13 may be lowered on the standard 11 by reciprocating the operatinglever`14 alter; nately up andV down. To facilitatev lower# nfofth members 12 and is on Stan-(timid 11,! the springs 35 and 36 `are kept tensione@ sufficiently todraw the jaws 2O and 2 8,slightly away from the standard 11 when' the` springs 31 and32 are relaxed, as in Fig.l 4;I butV the normal tension of these springs 35 and`36 isinsut'cient to pull the ` jaws 20 and 2,8away lolnthe standard 11 when the parts areinf latched position andthe springs 31 andk32I are tensioned as in lig.l 2.

Af clamping jaw 37 is.,removablymounted` onthe standard 11 to cooperate with mem-` ber12mwhen the jack is used asafpulling de,n vicelor Jfor other purposes readily apparent to those skilled in the art.

` While Ivhave illustrated and described the i f, preferred form of constructionV for,` carry,-

ing my invention into effect, this is capable of y variation and modification, without departing from the spirit of the invention. l, therefore, do not wish to be limited to the precise details of construction setV forth, but desire to avail myself or' such variations and modifications as come within the scope of the ap endedclailvrns. c y

. Iaving thus described my invention what I- claim as new and desire to protect by Letters Patents Y A 1."A jack comprising a standard, a pair of members movable axially along the standard and each including a portion extending at an acute angle with'respect to the axis oi' thestandard, a gripping jaw carried by each Offsd mmber, wel sich @i Said jaws 'iecludin'ga'portion vadapted forv wed'ging en gagement with lone of said rst-named portions, a crankv including Aan eccentric throw rotatably mounted in one of said members,y

an operating.A lever attached to4 the crank, ay l'ink''corineeting'. the throw and the other of said members,i and latcliscontrolled means urging, the grippingv jaws int-'o engagement with the standard and'saidjawportions into wedgi'ng engagement with said irstl-named portions. y l

2. A jack comprising a standard, a'pair of' spaced membersmovabl'e axially along the Standard, a11 lee11-1191udne a Portieri xtending acutely with respect to the axis of the standard, a grippingjaw carried byv each ot said'memberaeach off said j awsl includinga portion adaptedi'for wedging Aengagement with' one.L of the first-named portions,

a crank rotatzlblfy4 mounted".in` oneo-f said. members and', including an eccentric throw,

a, link connecting the i throw 1 andthe `second named member, resilient means urging the jaws into gripping engagement with 'the standardand portions into we'dging engagement, latch mechanism in latched" P'StQn CmPreSSes'fSad means, and lis ilient means, urging saidiulaws out of'grippingengagement with the standard andA said' portions'out of wedrging engagemenn,whenv latch mechanism is 'i in unlatched, position. i

jackcomprising a standard, a pair of members movable axially along the stands)- ardand each including. a portionextending atan alcute angle witnrespect tothe axis ofi the standard', ualgriplping jaw c arried byeacn of,"v said'membe'rsand each oifsaid jaws in'- clugding aportion adapted for wedging en-` gagementx withV one of said first-named portions, a crank including aneccentri'c throw rotatably.v mountedin one of said members,

anr operatingr'leyer attached to the crank, link connecting' the throw andthe other of, LSaid members. latchwltrolld means urging ther gripping jaws into lengagementwit-hg the@ standard, and said jaw! portions into, Wedslgf] @sagement with Said' firstname@ portions, and means urging the jaws out of K gripping engagement with the standard and said portions out of wedging engagement when the latch-controlled means are in in# effective position.

4f. A jack comprising a standard, a pair of members movable axially along the standard and each including a portion extending at an acute angle with respect to the axis of the standard, a gripping jaw carried by each of said members and each of said jaws including a portion adapted for wedging engagement with one of said first-named portions, a crank including an eccentric throw rotatably mounted in one of said members, an operating lever attached to the crank, a link connecting the throw and the other of said members, resilient means urging the gripping jaws into engagement with the standard and said portions into wedging engagement, latch mechanism or compressing said resilient means, and other resilient means urging said jaws out of gripping engagement and said portions out of wedging engagement when said latch mechanism is in ineffective position.

In testimony whereof I afIiX my. signature.

EMIL J. SEEBER.

Images