US2533174A - Shore - Google Patents

Description

Dec. 5, 1950 A. NEGOVAN SHORE Filed Jan. 50, 1945 INVENTOR. 6 1 an? r A EG'U Wu;

Patented Dec. 5, 1950 orrso area? ATENT oFFics SHORE.

Albert Negovan, Chicago, 111., assignor to Baker- Roos, Inc., Indianapolis, Ind, a corporation of Indiana 4 Glaims.

My invention relates to adjustable shores and more particularly to that type of shore in which the inner of the two telescopic parts is in the form of a pipe adapted to be gripped by pivotally interconnected dogs carried by the other, or outer short-part. it is the object of my invention to facilitate the operation of such shores and to render them more durable and more positive in action.

In carrying out my invention, I form the outer short-part of two spaced parallel members between which the inner shore-part is received. The outer shore-part carries a pair of pivotally interconnected dogs which grip the inner shore-part to hold the shore in any desired position of extension. Extending between the two members of the outer shore-part at a point adjacent the dogs I provide a tie-member located in the plane of the inner shore-part and provided with an opening which loosely receives such inner shore-part. The ends of the tie-member extend through the two parallel members. At one end, the tie-memher is provided with a nut limiting outward movement of the adjacent parallel member, while at the other end the tie-member is provided with a slot which receives a wedge cooperating with the other parallel member to force the two parallel members toward each other.

The accompanying drawing illustrates my invention: Fig. 1 is a side elevation of the complete shore; Fig. 2 is an isometric View illustrating the tie-member and associated parts; and Fig. 3 is a horizontal section on the line 3-3 oiFig. 1.

The shore shown in the drawing comprises an outer shore-part conveniently made of two parallel two-by-fours iii secured together at one end by a cross piece H. The inner shore-part is in the form of a pipe it. provided at one end with a foot is and at the other with a cross-head M which slidably receives the two members It). A pair of pivotally interconnected dogs 15 mounted on the ends of the members H! serve to grip the pipe 12 and hold the shore in extended position.

As so far described, the shore is old. My invention relates particularly to means for forcing the lower ends of the members it toward each other to tighten the grip of the dogs E on the pipe i2 when the shore has been adjusted to the desired degree of extension. In embodying my invention in a shore I provide the lower end of each of the members ill with a cap 29, desirably in the form or" a casting, from which there extends downwardly an ear 2E. Each ear 2! is provided with an opening 22 for the reception of a pivot pin or bolt !5' by means of which the ear is pivotally connected to one of the dogs i5.

The lower ends of the members in and the respectively associated caps 26 are provided with openings adapted to receive the end portions 23 and 24 of a tie-member 25. Such tie-member is provided with a central opening 26 adapted to I receive the pipe l2. The opening 26 is elongated longitudinally of the tie-member to permit movement of the tie member longitudinally of itself.

Each end portion of the tie-member 25 projects completely through and beyond its associated cap 29. Outwardly from the adjacent cap 26, the end-portion 23 is provided with screwthreads upon which a nut 21 is mounted. A washer 28 may be interposed between the nut 27 and the adjacent wall of the cap 28. The other end portion 2 5 is desirably rectangular in crosssection, and is provided with an elongated opening or slot 29 adapted to receive a wedge 3d. The lower end of the wedge, which is the smaller end, is desirably provided with means, such as a pin 30', preventing removal of the wedge from the slot 29.

It will be noted from Fig. 1 that the points at which the dogs i5 grip the pipe i2 lie above the axis of pivotal interconnection of the dogs and that such axis is in turn above the common plane of the pins 15. As a result, the gripping action of the dogs on the pipe involves an outward reaction of each dog on its associated pin it, and the dogs cannot grip the pipe effectively unless the pins !5 are prevented from moving outwardly under the influence of the reactions which the dogs exert upon them. Friction between the pipe and the dogs when the upper and lower shore-parts move relatively to each other tends to intensify the grip of the dogs when the shore is being collapsed and to release such grip when the shore is being extended.

In operation the shore is extended to the desired extent, an appropriate jacking device operating between the shore-parts being used if necessary to overcome the load on the shore. With the wedge 39 in place and with gravity urging it downwardly any lost-motion which would permit the pins IE to move away from each other is taken up, with the result that upon release of the shore-extending eiiort the dogs will immediately grip the pipe 52 and prevent the upper shore-part from dropping. When the shore has been extended to the degree desired, the wedge 36 is driven downwardly to tighten the grip of the dogs upon the pipe and hold the shore firmly in its extended condition.

When it is desired to collapse the shore, the wedge 30 is driven upwardly to permit the pins l5 to move away from each other. If, as will 3 generally be the case, the dogs still grip the pipe they may be released by tapping them downwardly at a point above their axis of interconnection.

As the dogs wear, the distance between the pins i5 must be reduced if the ability of the dogs to grip the pipe is to be preserved. In order to make it unnecessary to provide a wedge 36 long enough both to compensate for wear of the dogs and to tighten them, the nut 21 is employed to compensate for wear. That is, whenever the dogs have worn to an extent such that the wedge 30, even when driven as far downwardly as possible, does not tighten the dogs the nut 2! is advanced on the screw threads on the end of the tie member, thus reducing the extent to which the wedge must be driven downwardly to tighten the does.

It is to be noted that the forces exerted by the Wedge 30 and nut 27 on the lower ends of the members it! lie in the plane of the pipe i2. Accordingly, those forces together with the reactions of the dogs on the ears 2| do not generate any force-couples tending to twist the members if] or displace the dogs about the axis of the pipe [2.

I claim as my invention:

1. In an adjustable shore, two telescopically associated shore parts, the outer of shoreparts comprising a pair of spaced, parallel members between which the inner she-re per; 3O cated, a pair of dogs carried by said outer shorepart and adapted to grip the inner shore-p tie-member extending between and parallel members in the plane of said ll part and. provided with an opening lccsely 1' ing said inner shore-part, means on one en said tie-member for limiting outward 1novei. cnt of the adjacent parallel member relative to said tie-member, the other end of said me: being provided with an opening, and a wee disposed in said opening and cooperating the parallel member adjacent it for forcin members toward each other.

2. In an adjustable shore, two telescopically associated shore parts, the outer of said shore-- parts comprising a pair of spaced, parallel members between which the inner shore-part is located, means carried by said outer shore-part and adapted to grip the inner shore-part, a tiemember extending between and through said parallel members in the plane of said inner shore-part and provided with an opening loosely receiving said inner shore-part, means on one dof xii

end of said tie-member for limiting outward movement of the adjacent parallel member relative to said tie-member, and Wedge means acting between said tie-member and the other of said parallel members for forcing the parallel members toward each other.

3. In an adjustable shore, two telescopically associated shore parts, the outer of said shoreparts comprising a pair of spaced, parallel members between which the inner shore-part is located, a pair of dogs carried by said outer shorepart and adapted to grip the inner shore-part, a tie-member extending between and through said parallel members, one end of said tie-member being provided outwardly beyond the adjacent parallel member with screw-threads, a nut on said screw-threads for limiting outward movement of the adjacent parallel member relative to said tie-member, the other end of said tie memher being provided with an opening, and a wedge disposed in said opening and cooperating with the parallel member adjacent it for forcing said members toward each other, the smaller end of said wedge being directed downwardly whereby the force of gravity acting on the wedge will bias said parallel members toward each other.

4. In an adjustable shore, two telescopically associated shore parts, the outer of said parts comprising a pair of spaced, parallel members between which the other shore-part is located, a pair of pivotally interconnected dogs having outer ends respectively connected to said parallel members and adapted to grip the inner shorepart while exerting outward reactions on said members, and releasable, irreversible means biasing said members toward each other and operative at all times when not released to prevent any movement of said members away from each other.

ALBERT NEGOVAN.

QES CETED UNITED STATES PATENTS Certificate of Correction Patent No. 2,533,174 December 5, 1950 ALBERT NEGOVAN It is hereby certified that error appears in the printed specification of the above numbered patent requiring correction as follows:

Column 1, lines 6 and 11, for the Word short-part read shore-part;

and that the said Letters Patent should be read as corrected above, so that the same may conform to the record of the case in the Patent Ofiice. Signed and sealed this 13th day of February A. D. 1951.

THOMAS F. MURPHY,

Assistant Gammz'sez'aner of Patents.

Images