A lowering system for lowering ceiling formworks during the removal of formworks of a building ceiling, comprising a reciprocating piston and a support base, and a locking device, wherein the reciprocating piston is slidably mounted in the support base, and can be pushed from an extended working position to a lowered position, and can be locked in the extended position by means of the locking device. The locking device has a pivot bearing and an eccentric lever, wherein the eccentric lever is rotatably mounted in the pivot bearing, and the reciprocating piston and the support base are supported against each other in the working position by means of the eccentric lever.

There is provided an erectable compression post for installing temporary fencing. The erectable compression post including: an upper portion positionable in engagement with a ceiling; a lower portion positionable in engagement with a floor, the upper portion moveable vertically within the lower portion; a fence retaining portion affixed to the upper portion or the lower portion; a compression assembly to bias the upper portion away from the lower portion; and a locking assembly to lock a position of the upper portion relative to the lower portion, the locking assembly including: a handle rotatably connected to the lower portion; and a tilting plate positioned around the upper portion and tiltable via urging by the handle to frictionally engage the upper portion to retain the upper portion relative to the lower portion.

A supporting device for the construction industry. Said device has a fixing element which rests against a side wall and is fixed at a fixing point of the side wall. Said device also has a cantilever which is connected to the fixing element and, when the fixing element is in the fixed state, projects from the side wall such that a load element can rest against a bearing point of a bearing element of the cantilever. The load element can now be displaced in a displacement direction substantially parallel to the side wall relative to the cantilever and, when the load element rests against the bearing element of the cantilever, the cantilever is coupled to the load element such that a displacement force component acts on the cantilever in the displacement direction when the load element is displaced, said displacement force component resulting in a torque on the cantilever.

A support is provided, comprising a first bar with a first abutment element, a second bar with a second abutment element, and a guiding device by which the first bar is displaceably guided on the second bar. An actuating device which acts on the first bar and which comprises an actuating element is arranged on the second bar. A displacement of the first bar in a first direction of displacement can be initiated by actuation of the actuating element. The first direction of displacement is a direction of increase in distance between the first abutment element and the second abutment element. The actuating device comprises a blocking device which blocks a displacement of the first bar in relation to the second bar in a second direction of displacement, which is opposite the first direction of displacement, at least when no active releasing action occurs at the blocking device.

There is provided an erectable compression post for installing temporary fencing. The erectable compression post including: an upper portion positionable in engagement with a ceiling; a lower portion positionable in engagement with a floor, the upper portion moveable vertically within the lower portion; a fence retaining portion affixed to the upper portion or the lower portion; a compression assembly to bias the upper portion away from the lower portion; and a locking assembly to lock a position of the upper portion relative to the lower portion, the locking assembly including: a handle rotatably connected to the lower portion; and a tilting plate positioned around the upper portion and tiltable via urging by the handle to frictionally engage the upper portion to retain the upper portion relative to the lower portion.