A jack assembly 100 for varying or adjusting the relative positions of a first component, such as a prop (P1, 2 fig.1a), and a second component, such a foot (F1, 2 fig.1b) or end plate (EL2, EU2 fig.1b). The jacking system includes a base 120 attachable to the first component wherein the base includes a housing 124 having a longitudinal channel A extending therethrough and defining an axis of the assembly. An externally screw-threaded rod or bar 160 is attachable at or adjacent at one of its ends 164 to the second component and a collar 140, mounted within the channel A, is internally screw-threaded so as to be able to screwingly receive a portion 162 of the rod or bar 160 upon rotation about the axis. The collar is freely rotatable about the axis yet is constrained, perhaps by an annular step 147, so as not to be moveable relative to the base portion 120 along the axis.
Jack assembly for use in propping systems
2024-02-14
Patent
Electronic Resource
English
IPC: | B66F HOISTING, LIFTING, HAULING, OR PUSHING, NOT OTHERWISE PROVIDED FOR, e.g. DEVICES WHICH APPLY A LIFTING OR PUSHING FORCE DIRECTLY TO THE SURFACE OF A LOAD , Hub-, Verhol- oder Schubvorrichtungen, soweit nicht anderweitig vorgesehen, z.B. Vorrichtungen mit unmittelbarer Krafteinwirkung auf die Last / E04G SCAFFOLDING , Baugerüste / E21D SHAFTS , Schächte |
Emerald Group Publishing | 1978