US1171240A - Lifting-jack. - Google Patents

Description

LIFTING JACK.

APPLICATION FILED APn.2.1915.

Patente Feb; y8, 1916.v

w/mfssfs 'ma coLUMB'xA PLAtgoaRAPi-x co., WASHINGTON, D.

eurens, raie.

extending laterally v ce of pipe' 5'4 which ions 6, Vwhereby a'A :ket is provided. the wrenchr corn- 'le shaft' or. rod 7 idable in the pbase" the rod is a load'-` lg of a tube 8 and re load is supportrthe upper end' of ded with" a T-cou- V tterally extending is adapted to 'be operated, and the ilt'aneously ybut at han the rod 7. In section ofy the jack rentially .movable nbodie's a lever 12 )per end of a link :h is pivotedI 'on a tends through` the 111 being' disposed i. The lever 12 is with the rodv 7, so edi, the rod 7 will lever 12 extends s extremity 17 is vith the *lower end sov -ias its upper end wardly projecting nrt ofthe movable e pivot 18`is more 13 thanA the pivot lave a more rapid 7 and obviously nge of movement.

le b`arn22 for in- The load is' held p i 23 which is oon- LrrTING-JACK.

spedica'uqnof Letters imitant'. i

Patent Appliaaron` inedl Aprii a, 19151 serial' No. 18,715.

To all ywhom it may concern.' l i' Be it known that I, GEORGE A. PIPER, a citizen ofthe United States,and a resident of Omaha, in the county of Douglas and vState of Nebraska, have invented a new and Improved Lifting-J ack, of which the followinvV is a -full clear' and exact descri tion".4

f This invention relates to lifting jacks of that type including" a lever for actuating the movable part or loadeelevatfing element of the ack.

The invention hasv foi-its general objects to improve and simplify the' construction and operation of devices of the character referred to so as to be reliable and efhcient in use, comparatively simple' and inexpenr sive'to manufacture, and' so designed as tobe quick in action. l

A more specific object of the invention is the provision of a quick-acting jack in which the *movable part thereof is made in two elements operating simultaneously by a sin; gle lever but having a different range of movement, whereby the total lifting action of the jack is materiallyv increasedy compared with the normal height thereof, and where# by the power is materially increased.

Another specific object of the invention is the4 provision of a prop between the movable l section of the jack andthe base or stationary section, which prop is automatically set as the operating lever is actuated in the lifting' of a load, there being means for releasing the prop when the load is to be lowered.

Vith such objects in view, and others which. will appear as the description pro.- ceeds, the invention comprises various novel features of construction and arrangement of parts which will be set forth with particularity in the following description f and claims appended hereto.

In the accompanying drawing, which,

illustrates one embodiment of the invention and wherein similar characters of reference.

indicate corresponding parts in all thev views, Figure 1 is a side view of the jack with portions in section; Fig. 2`is a horizontal section on the line 2 2, Fig. 1; and Fig. 3 is a detail sectional viewv on the line 3 3, Fig. 1.

Referring to the drawing, A designates the base or body section of the jack, which in the present instance is shown as a secvtion of pipe 1 threaded into a foot-piece 2 and having on its upper end a T-coupling 3 with lone arm 4 thereof ve and containing a shorty pie is split to* form bifurcati laterally v extending. brac The movable section B oi prises a vertically mov'a'b that has its lower end sli column 1, and sli'da'ble' on carryingf'j elementl consistir a seat' 9,; on which latter'tl ed. The' tube 8' surrounds thesha-ft '7 and it is provi pling 10 that carries a lz member The rod'7 raisedA when the' jack is' 1 part' 8 is alsoV raised simi a different rate or faster tl other words, the movable s isy composed of two di'e parts7 and 8.

The operating means er fulcrumed at 13 on' the u1 14', the Vlower end of whic horizontal bolt 15 that eX bracket piece 5, the linkV between the bifurcations t pivotally connected `at 16 that asl the lever 12 is tilt move up' or down; The

beyond the rod 7 and it; pivotallyconnecte'd at 18 v of a link 19,-w'hich link] 2O pivoted at 21 to the for bracket 11 of 'the upperpa section of the jack. As thi remote' from the fulcrum' 16, the upper partV 8 will l movement than the part the part Sh'a's agreater ra The lever 12has a hand creasing the leverage; 'l raised by'means of a v prop nected with thepivot 18,

tends downwardly across 1 jack'and coperates with which latter is adapted to of a series of ratchet teeth edge of the prop 23. Th .are so shaped that, as the to raise a load, the prop wardly on the pivot pin will automatically lock thi load has been raised to'th To lower the load it is ne the prop, yand for this pu means is mounted on the operating lever,

such means comprising a bell-crank lever 25 that is connected by a link 26 with the lower end of the prop 23, and connected by a rod 27 with a grip lever 28 associated with the handle end of the handle bar 22. Thus, by pressing the grip lever 28 the prop is raised so that its teeth will free the pin l5, and while it is thus held released the operating lever 22 is allowed to move upwardly so that the. load on the' Iiack will be lowered.

From the foregoing description taken in connection with the accompanying' drawing, the advantages of the construction and method of operation will be readily understood by those skilled in the art to which the invention appertains, yand while I have def scribed the principleof operation, together with the device which I now consider to be the best embodiment thereof, desire to have it understood that the device shown is merely illustrative and that such changes may be made when desired as fall within the scope of the appended claims.

Having thus described my invention, I claim as new and desire to secure by Letters Patent: v

l. A jack comprising a stationary base section, a movable upper section composed of two parts movable simultaneously in the same direction and at different rates, and an'operating lever ulcrumed on the base section and operatively connected with the said movable parts on the upper section.

2. A, jack comprising a stationary base section, a movable upper section composed of two parts movable simultaneously in the same direction and at different rates, an operating lever fulcrumed on the base section and operatively connected with the said movable parts on the upper section, and a prop pivotally connected with the lever and having means automatically engaging the base section to prop the lever raised.

3. A jack comprising a stationary base section, a movable-upper sectioncomposed of differentially movable parts, an Yoperating lever fulcrumed on the base usection and operatively connected with the said movable parts on the upper section, a prop pivotally connected with the lever and having means automatically engaging the base section to element slidable on the upper end oi the rod, an operating lever, means for ulcruni- Iing the lever on the column, a pivotal. connection between the lever and rod, and means for operatively connecting the loadcarrying element with the lever at a point more remote from the fulcrum of the lever than .the pivotal connection between Ythe lever and the rod. Y

'5. A jack comprising a base section embodying a .hollow column, a rod slidable vertically on the column, a load-carrying element Yslidable on the upper end of the rod, an operating lever, means ior ulcruming the lever on the column, a pivotal connection between the lever and rod, means for operatively connecting the load-carrying element with the lever at a point more remote from the fulcrum of the lever than the pivotal connection between .the lever and the rod, and an yautomatic prop device for holding the rod and load-carrying element propped up when sustaining a load.

6. A jack comprising a base section including a hollow column, a rod movable vertically in the column, a load-carrying element slidable on the upper end of the rod, a link pivoted on the column, a lever fulcrnmed on the link, a pivotal connection between the lever and rod, a link pivotally connected with the load-carrying element, a pivotal connection between the lever and last mentioned link, a prop pivotally connected with the lever and having ratchet teeth, and mea-ns carried by the column with which the teeth are adapted to engage to prop the rod and load-carrying element raised, and means carried by the lever for releasingthe prop for permitting the rod and load-carrying element to be lov/ered.

ln testimony whereof I have signed my name to this specilication in the presence oi two subscribing witnesses.

GEORGE ARTI-IER PPER.

i J. W. TIBrr'rs,

E. SREIGER.

Copies of this patent may be obtained yfor five cents each, by addressing;1 the Commissioner of Patents.

Washington, D. C.

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