US752502A - Lifting - Google Patents

Description

'No. 752,502. PATENTED FEB. 16, 1904;.

B. c'. YEAGER. LIFTIN-G JAGK.

APPLICATION FILED MAY 9. 1903.

N0 MODEL.

g STATES Patented February 16, 1904.

A ENT ICE EARNEST onnrisrnnenn, or nocKnr- L' erms.

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srncrrrcA rroiv forming air r Letters Patent no. 752,502,, dated. February 16, 1904.

To all whom it may concern.- XI i Be it known that I, EARNEST CURTIS YEA- a horizontal plane; and one objectofmyin vention is to provide a light. jack having a detachable base which can be readily turned to a horizontal or inclined positiomand' to provide theihorn of-the jack with gripping means 'whereby a pulling efiect may-be gained as distinguished fromapushing effect and which' and the lower one has parallel forwardly-exwill enablethe operator to lift aload below 7 the-support on whichthevjack is arranged or toexert a tension in a horizontal plane, asin st-retch-ing'a wire, wh-ich, in effect, would be thesame -as lifting a load from below the point on which the device was positioned.

My invention consists in a standard, a' horn sliding thereon, a lever pivotally connected to, the horn, clamping members'adapted to alternately grip and slide on the standard, and also in the details of construction described hereinafter and particularly pointed out claims.

In the accompanying drawings, Figure l is a perspective view of my'device as seen from one side. Fig. 2- is an elevation, parts being in section. Fig. 3 is a detail perspective view of the horn and clamping members as seen from the opposite side of Fig. 1. Fig. 4 is a perspective view of one of the clamping members detached. Fig. 5 is a detail top. plan view of the standards, and Fig. 6 is a perspective view of the horn detached.

In the drawings above described, A represents a standard out out along the sides, as at A, to make it lighter, its lower end fitting in a detachable base, which is adapted to be secured to a floor or platform. Sliding upon this standard is the horn B, comprising an upper forwardly-projecting portion B, curved in the Application filed May 9, 1903- Serialll'o, 156,452. (No model) on its upper face and having a'rearwardlyextending integral arm B, which is vertically and centrally slotted at B adapting the arm to 'fit over and slide on the-standard. The

mainbody of the horn extends downwardly and has-a rearwardly extending arm -B -recessed on one side, as shown at'Bfl the recess being adapted to receive the standard and alining with the slotB In the'rear edge of the body portion intermediate thetwoarms is. formed a notchB An upwardly-curved lever C is pivotally secured to one side' ofthe lower body portionof the horn-,the outer end ofthe lever being provided with'the flanges C, between which is securedtheoperatinghandle 0 this handle being on theopposite side-of the standard from the horn.

Two clamping members. I) are provided, each'of which jis'centrally cut out, as at D,

jacentthe lugs.'-='These clamping members slide loosely on the'standard; one of them being arranged-loathe standard between the lower armn 'A link 'E' is pivoted atone end between'the "arms of the" horn'and the other one below the forming a shoulder F which engages the upper edge of the rear end of the lower clamping member.

Compound curved springs G are secured at one end in the sockets D and their opposite and upper ends bear against the standard. Each clamping member is formed with an interior recess opening into the cut-out portion which projects from the recess and has a serrated surface adapted to bite into the standard.

On one side of the horn just below the curved portion is a lug H, and pivoted adjacent same is a member H, having a toothed curved face H adapted to be swung upward away from the lug and to engage the lug when swung downward.

At its upper end a plate J is secured to the standard, having a curved lateral flange J and a stop-lug J A handle member J 3 is pivotally secured on the plate. Its inner end has a curved serrated face J and when the hendle is pressed downward a rope or wire will he clamped between the serrated face and the curved flange, and the handle can be also used for carrying the jack';.as the lug prevents the handle being raised above a horizontal position.

The operation of my device. is as follows; When the handle C is in the position shown in the drawings, the :lower member will be inclined relative to the standard, Q11 drawing downward on the handle the fulcrum-point of the lever C will be at the point where it is pivoted to the link E and-the horn will be raised, lifting the upper link into a horizontal position. When the movement of the lever is reversed, the upper member will grip-the standard and hold the horn in its elevated position, while the lower member will be drawn into a horizontal positidn and lifted, .30 that when the lever is again in position to be drawn downward the lower member will again grip the standard at a higher point, When it is desired to move the horn and clamping memberslfreely on the standard,- the shoulder F D on the lower member and fits into the notch B.

The springs aid in holding the clamping members at an angle to the standard, and the member Hserves to clamp and hold a wire when the instrument is used as a wirestretcher.

Having thus fully described my invention, what I claim as new, and desire to secure by Letters Patent, is

1. A lifting-jack comprising alstandard, a horn having an upwardly-curved point, said horn being adapted to slide on the standard, a lever secured to the lower part of the horn, a clamping member sliding on the standard above the lever and adapted to engage the horn, a clamping member sliding on the standard below and piVotally. connected to the lever, and a bar pivoted intermediate its ends.

and adapted to engage the clamping members.

2, In a lifting-jack, a Standard, a horn comprising aforwardly projecting portion curved on its upper face and having a rearwardlyprojecting slotted arm adapted to slide on the standard, and a downwardly extending body portion notched on its inner side adjacent its lower end, and having an integral, rearwardlyextending arm, one side of said arm being recessed for the purpose specified.

3,. A lifting-jack comprising a standard, a horn sliding on same, clamping members, the upper clamping member being loosely secured on the standard between the horn and the lever, and the lower member being positioned below the lever, the upper member having a nose adapted to engage a notch formed in the horn, and carrying a block having aserrated face adapted to bite into one side of the standard, and vthe lower member having a similar block adapted to engage the side of the standard, a link connecting the lower clamping member to the lever, and springs secured in the clamping members and bearing on the bar.

EARNEST CURTIS YEAGER.

Witnesses:

J. B, ASHBY, W. H. DUNCAN.

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