US 4,004,393 AGranted

Adjustable heighth shoring

AssigneeBeaver-Advance Corporation

InventorRonald G. Morris

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Abstract

A shoring or scaffold for construction, maintenance and other work, using stacked scaffold sections of a demountable type and having a heighth adjusting construction is provided. Each section has a pair of spaced-apart end frames that are demountably cross-connected with respect to each other and the end frames of upper and lower sections have a telescopic adjustable relation to meet heighth requirements. To provide strength and support rigidity, dual-tire bracing members are utilized to extend from the end frame of a lower section across and in an interconnecting relation with an opposed end frame of an upper section. A simple adjustment of the bracing members in conformance with vertical adjustments made between upper and lower sections is accomplished by utilizing members that at one end have a gooser pivot mounting on a horizontally extending connecting member of a frame of one section and that at the other end have a latching arm which is provided with a group of spaced-apart latching hole portions whose spacing is proportioned to vertical adjustment positions between the upper and lower sections. The latching hole portions are adapted to selectively detachably latch with a single latching pin means which is carried in a protected relation on an inwardly offset, short length or secondary leg member of the opposed frame of the other section. This enables the use of a single brace member for different heighth adjustments of stacked sections.

In an adjustable heighth scaffold having substantially rectangular upper and lower sections, each section having a pair of horizontally spaced-apart upright end frames, each end frame having a pair of tubular transversely spaced-apart upright primary supporting leg members, and the lower ends of the leg members of the upper section being adapted to telescopically adjustably fit with the upper ends of the leg members of the lower section, the improvement which comprises:

a horizontal connector member integrally secured to and extending across between the pair of supporting leg members of each end frame of one of said sections adjacent an upper end portion thereof, a pair of horizontal cross-extending members integrally secured to and positioned in a vertically spaced-apart relation with respect to each other between the pair of supporting leg members of each end frame of the other of said sections adjacent an upper end portion thereof, a pair of shorter length leg members extending vertically across and being integrally secured between each said pair of cross-connecting members, each said pair of shorter length leg members being positioned in an adjacent inwardly spaced relation with respect to an associated supporting leg member of its frame, latch pin means secured on each of said shorter length leg members, a pair of cross brace members for detachably connecting each end frame of the one section with an opposite end frame of the other section, each of said cross brace members being provided with a swing bracket latching means at one end thereof and a latching arm at the other end thereof having a group of lengthwise spaced-apart latching hole portions, said swing bracket latching means being adapted to pivotally engage on said connector member of one end frame of said one section, and said latching arm being adapted to have one of its latching hole portions latch-engage said latch pin means of the opposite end frame of said other section.

Abstract

Claims11