Shoring system

Claim 2

In a shoring system: a frame comprising a pair of hOllow, parallel, upright members joined by substantially rigid lateral members extending therebetween; extension members telescopically adjustably disposed in said upright members; a frame brace bar slidably secured to and extending between said extension members; and bracing means extending between fixed points on said frame brace bar and the extension members said frame brace bar comprising an elongated rigid portion having shore collars secured to the ends thereof and being of a width equal to that of the frame taken between the upright members such that the shore collars slidably enclose the extension members, said system further including a stud collar secured to an extension member at a location spaced from an end thereof and of a dimension to abut the upper surface of the shore collar on the frame brace bar when the extension member is fully telescopically retracted into the upright member.

Claim 3

Apparatus as defined in claim 1 including means for independently selectively securing the shore collars to the extension members at spaced points along the extension members.

Claim 4

Apparatus as defined in claim 2 wherein the means for securing comprises a plurality of holes in the extension members and shore pins for insertion into said holes such that such pins rest on the upper surface of the tubular shore collars.

Claim 5

Apparatus as defined in claim 3 including semicircular notches formed in the upper surfaces of the shore collars.

Claim 6

Apparatus as defined in claim 1 wherein the bracing means includes a first stud extending from the stud collar, a second stud secured to the frame brace bar, and a diagonal brace bar extending between and secured by the studs.

Claim 7

Apparatus as defined in claim 5 wherein the frame brace bar has an additional stud secured thereto and extending opposite to the first stud, the second and additional studs being substantially at the center of the frame brace bar but axially offset from one another.

Claim 8

In a shoring system: a frame comprising a pair of hollow, parallel, upright members joined by substantially rigid lateral members extending therebetween; extension members telescopically adjustably disposed in said upright members; a frame brace bar slidably secured to and extending between said extension members; and bracing means extending between fixed points on said frame brace bar and the extension members, said extension members including a threaded portion on the free ends thereof, a nut on the threaded portion for travel thereover, and a sleeve disposed telescopically over the threaded portion and bearing against the nut, said system further including stabilizing means in the form of a shaft disposed telescopically within the extension member and being secured at the outer end thereof to the load-bearing sleeve so as to react between the extension member and the load-bearing sleeve for lateral stabilizing purposes, and means for preventing the removal of the load-bearing sleeve and the stabilizing shaft from the extension member except when the stabilizing shaft and sleeve are in a predetermined angular position.

Claim 9

In a shoring system: a frame comprising a pair of hollow, parallel, upright members joined by substantially rigid lateral members extending therebetween; extension members telescopically adjustably disposed in said upright members; a frame brace bar slidably secured to and extending between said extension members; and bracing means extending between fixed points on said frame brace bar and the extension members, said extension members including a threaded portion on the free ends thereof, a nut on the threaded portion for travel thereover, and a sleeve disposed telescopically over the threaded portion and bearing against the nut, said system further including stabilizing means in the form of a shaft disposed telescopically within the extension member and being secured at the outer end thereof to the load-bearing sleeve so as to react between the extension member and the load-bearing sleeve for lateral stabilizing purposes, and means for preventing the removal of the load-bearing sleeve and the stabilizing shaft from the extension member except when the stabilizing shaft and sleeve are in a predetermined angular position.

Claim 10

Apparatus as defined in claim 7 wherein said means for preventing includes a pair of diametrically opposite fingers carried by the nut and having inwardly projecting ends adjacent the load-bearing sleeve and at least one pair of radially extending lugs on the load-bearing sleeve which interfere with the fingers to prevent axial travel of the sleeve except when the sleeve is in a predetermined angular position.