US 1516616 A
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1,516,616 G. w. MEYER LIFTING JACK Filed June 29. 1923 Patented Nov. 25, l24.
'ATES PA-TEN FiCE.
GEORGE w. MEYER, E CINCINNATI, onro, ASSIGNOR OF O E-HALE T0 CHARLES A.
' ROOS, 0F CINCI1\TNATI, 01110.
Application filed June 29, 1923. Seriall N0.'648,482.
To all whom z't-mizy concern:
Be it known that I, GEORGE W. MEYER, a citizen of the United States, residing at Cincinnati, in the county of Hamilton and State of Ohio, have invented new and useful Improvements in Lifting Jacks, of which the following is a specification.
My invention relates to jacking devices used particularly in the building art to jack up and tighten adjustable shores. It consists primarily in an improvement over patent to H. W. Roos No. 1,415,055 and is designed particularl for use with adjustable shores described in patent to G. W. Meyer and G. A. Roos No. 1,415,602 and those of a generally similar type.
The principal object of my invention is to provide a device of simple construction for extending or tightening a shore without bending or damaging the parts thereof.
My invention is illustrated in the accompanying drawings in which: Fig. 1 is a top plan view of my improved jacking device,
Fig. 2 is a side elevation of an adjustable shore showing my device in position for use,
-with one side of the forked lever broken away, and
Fig. 3 is a front elevation of an adjustable shore adapted to be extended by the use of my invention.
Referring now t0 the drawings, particularly to Fig. '3, showing an adjustable shore comprising a relatively fixed stanchion B preferably made of steel tubing, telescopially engaged with a movable member A comprisingthe uprights a and a preferably -made of wood and spaced apart in parallel relation'to each-other by the terminal head 6, tie plates a and base plate a The 'tie plates a and base plate a are centrally perforated, to allow the passage of the stanchion B, therethrough, said perforated plates acting as guides for said stanchion B.
'An automatic locking device comprising the perforated plate C formed with upturned sides a is pivoted between the uprights, a and a near the base plate a and is actuated by the coiled spring S located between the underside of the plate 0 and the base plate (1 so as to hold the movable member A infixed relation to the stanchion B when said members A and B have been telescopically adjusted.
. Adjustable shores of the above mentioned the exact height by means of a jacking device ,1
Referring now to the jacking device as shown in Fig. 1. A forked lever'E' comprising the lever e and the fork arms 6 and e is provided with a pivot e secured to said arms. A clamping link (2 pierced at its inner end by the pivot e is provided at its outer end with a grooved clamping edge e. A clamping hook e provided'with a suitable inner clamping surface 6 is looselypivoted to said clamping link e by the stud bolt 0 Said link 6 and hook combine to form an eflicient clamp with gripping edges grooved to conform to the shape of the stanchion B of the shore. When it is desired to jack up the shore the hook e and link 6 are placed in position on the fixed stanchion B- see Fig. 2-the link 6 being loose on the pivot and the hook 6 being loosely secured to said link, the entire grooved edges 6* and e will contact with the stanchion B and form an efficient and even clamp, by exerting a downward pressure on the lever e the pivot 6 will act as a fulcrum, the arms 6 and a being jforced upward against the under side of the base plate a thereby extending the parallel uprights a and a of the shore with relation to the fixed stanchion B. By constructing the clamping member of two self adjusting parts, namely the hook -e and link 0 the stanchion B is protected from the nicking and bending effects that are experienced when using lifting jacks of the type described in patent to Roos No. 1,415,055.
Obviously many changes may be made the device without departing from the spirit of my invention and I claim as within the scope of myinvention all devices readable on the claims that will be finally allowed.
I claim as my invention and desire to secure by Letters Patent of the United States:
1. A jacking device for use when adjusting extensible shores comprising two separate gripping jaw members, and a lever directly secured by a pivot to one of said gripping jaw members, said jack being completely removable from said shore upon releasing the grip of its jaws thereon.
ing extensible shores, comprising two grip-' ping jaw members pivoted together and a ever directly pivoted to one of said gripping jaw membe'rs.
3. A jacking deviee for use when extending adjustable shores, comprising a forked leverthe free ends of whose fork are adapted to bear upon the telescoping end of the movable member of the shore, two-separate gripping jaws adapted to engage a contiguous portion of the stationary element of the shore, said gripping jaws pivoted to each other, and one of said grippin jaw members fulcrumed to said forked ever. 1
4. A jacking device for use when extending adjustable shores, comprising a forked lever the free ends of whose fork are adapted to bear upon the telescoping end of the movable member of the shore, two separate gripping jaws adapted to engage a'contiguous portion of the stationary element of the shore, said gripping jaws pivoted to'each other, and one of said gripping jaw members pivoted to .said forked lever.
5. A jacking device for use when extending adjustable shores, oomprising'a forked lever the free ends of whose fork are adapted to bear upon the telescoping ends of the movable member of the shore, a- T shaped member whose top is pivoted within the fork of said lever and. the free end of whose upright isadapted to act as a ripping jaw, and a gripping hook pivoted to said T shaped member in proximity to its gripping jaw so that said gripping hook and gripping jaw will coact to clamp upon the statlonary element of the shore.
6. A jacking device for use when adjusting extensible shores having a relatively fixed part below and a relatively movablepart above, comprising a lever, a clampin element pivoted to said lever, nd a secon clamping element pivoted to t e first mentioned clamping element, said clamping ele -\ments adapted to coact in gripping" the rela- -tijvely fixed part of the shore to be adjusted.
'- 7. A jackmg'device for use when adjusting extensible shores having a relatively fixed art below and a relatively movable part a ove, comprising a lever having a prying foot portion, a clamping element pivoted to said lever and a second clamping element pivoted to the firstmentioned clamping element, said clampin elements adapted to 'coact in gripping t e relatively fixed part of the shore to be adjusted and hold it while the pressure exerted upon the lever handle causes the force exerted thru the prying foot to change the relative longitudinal position of the s ore elements. J
8. For use in adjusting telescopically extensible shores composed of two elements, one of which has a metal column; a removable jacking device comprising two separate In hand.
y GEORGE W. MEYER.