A length adjustable plank comprising at least two parts longitudinally adjustable relative to each other, each including two parallel longitudinal beams constituting profile rods, and forming a longitudinal guide, and transverse beams forming a standing surface covering the longitudinal beams and connecting the latter to each other. The longitudinal beams of one part are guided between the longitudinal beams of the other part, and the length of the transverse beams on top of the outer lying longitudinal beams equals the width of the plank, whereas those on top of the inner lying longitudinal beams are somewhat smaller in length than the open spacing of the outer lying longitudinal beams. A fastening device secures the inner lying longitudinal beams in the use condition such that the respective transverse beams of both parts over the inner and outer lying longitudinal beams, respectively, mesh with each other in the manner that the upper surfaces of the transverse beams lie substantially in the same plane.
A support having two support sections slidably engaged with each other includes a lock that can be used to releasably fix the size of the support surface defined by the support sections. The lock is mounted to one of the support sections and includes a shaft that can be received by any of the series of openings defined by the remaining support section. When the shaft is located within an opening, the positions of the support sections relative to each other are fixed, and the support surface will remain stable during use.
A corridor spanned or suspended between horizontal support members such as girder members in structures such as those of buildings, ships, etc. so that operators can walk or carry out operations on the corridor. The corridor comprises a main corridor and a sub-corridor, connected to the main corridor to adjust the length of the corridor. This corridor can be easily incorporated in and moved from structures to be built, easily transported and housed in narrow spaces and mounted on different length of places by one unit of the corridor.
An improved means for securing planking to a horizontal support in a platform having a plurality of vertical support frames laterally joined with cross braces for use in constructing bleachers, risers and stages. The vertical support frames have horizontal supports for planking and means are concealed within the underside of the planking to prevent the planking from uplifting or shifting from end to end or back and forth on the horizontal support. The means are in the form of male and female mating endcaps for the planking in cooperation with a hook provided on the horizontal support.
A formwork board is disclosed for use in the placement of concrete slabs, sidewalks, driveways, and footings. It includes a first element and a second element. The first element is adapted to telescopically receive the second element to provide a board of variable lengths. The elements of the board are advantageously fabricated from a light metal, or a light metal alloy.
A floor joist support system for extension between foundation walls of the building structure employs a generally channel-shaped joist support member having slots arranged at spaced intervals and extending horizontally between a pair of foundation walls. A plurality of joist sections are arranged in oppositely directed pairs for extension between a second pair of foundation walls transversely of the joist support member, the joist pairs extending through adjacent pairs of slots in the joist support member. The joist sections are affixed both to the joist support member and the foundation walls after the total effective length of the joist pairs is adjusted to correspond to the distance between the second pair of foundation walls.
