A lean-to rigging apparatus is described for installation in a shaft, such as an elevator shaft, having a wall and including at least one sill opposite the wall. The rigging apparatus includes a spanning beam, a sill support structure, a wall support member, and a hoist connector. The sill support structure on a first end of the spanning beam is designed to seat against a sill in the in the shaft while the wall support member on a second end of the spanning beam abuts against the opposite shaft wall. The sill support structure is rigidly connected to the spanning beam in a hingeless configuration and can seat against a sill in a plurality of seating positions. These seating positions allow the rigging apparatus to be positioned in a plurality of angles and therefore to be installed in shafts of different dimensions. The hoist connector is configured to allow a connection to a hoist device for hoisting various materials from one level to another within the shaft.

A lean-to rigging apparatus is described for installation in a shaft, such as an elevator shaft, having a wall and including at least one sill opposite the wall. The rigging apparatus includes a spanning beam, a sill support structure, a wall support member, and a hoist connector. The sill support structure on a first end of the spanning beam is designed to seat against a sill in the in the shaft while the wall support member on a second end of the spanning beam abuts against the opposite shaft wall. The sill support structure is rigidly connected to the spanning beam in a hingeless configuration and can seat against a sill in a plurality of seating positions. These seating positions allow the rigging apparatus to be positioned in a plurality of angles and therefore to be installed in shafts of different dimensions. The hoist connector is configured to allow a connection to a hoist device for hoisting various materials from one level to another within the shaft.

A mobile support apparatus that includes one or more extension and refraction devices and a unit that is releasably attachable to vertical members of the apparatus such that the apparatus can be extended in one or more stages to a vertical height that is substantially greater than the height of the fully retracted apparatus. The mobile support apparatus is useful for a multitude of new and existing construction-related applications.

A load release means for a telescopic prop, the load release means comprising: an inner member with at least one threaded portion; a striking collar with threaded internal bore configured to threadedly engage with the threaded portion of the inner member through a thread interface; and, locking means to releasably secure said striking collar on said inner member, whereby, in use, when an applied load V acts directly on the thread interface, the component force S of the applied load V provides most or all of the striking torque such that when the locking means is released little to no external torque is required to be applied to the striking collar to strike the striking collar.

A hanger bar assembly for a recessed luminaire is disclosed. The hanger bar assembly includes a first hanger bar member having a first attachment structure disposed on an end thereof, and a second hanger bar member having a second attachment structure disposed on an end thereof, the second hanger bar member being adjacent to the first hanger bar member. The first and the second attachment structures each include a first wall having a first fastener aperture and a second wall having a second fastener aperture, the first and second fastener apertures being formed about a common central longitudinal axis.

A hanger bar assembly for a recessed luminaire is disclosed. The hanger bar assembly includes a first hanger bar member having a first attachment structure disposed on an end thereof, and a second hanger bar member having a second attachment structure disposed on an end thereof, the second hanger bar member being adjacent to the first hanger bar member. The first and the second attachment structures each include a first wall having a first fastener aperture and a second wall having a second fastener aperture, the first and second fastener apertures being formed about a common central longitudinal axis.

A formwork supporting apparatus for supporting a formwork for casting concrete is proposed. More specifically, a formwork supporting apparatus is installed by paratactically connecting at least one support frame (100) achieved by connecting a front and a rear vertical frame (10, 20) in a square form by a connection frame (30), so as to support a formwork, wherein the support frame (100) is connected and assembled by a front and a rear vertical assembling part (60, 70) while being vertically stacked corresponding to the height of the formwork. Therefore, during casting and curing of concrete while continuing to connect and install the formwork upward, the supporting apparatus is installed by connecting the support frame to be consecutively stacked upward instead of reinstalling a support frame on the upper position as in the prior art, and thus can significantly improve workability and convenience.

A formwork supporting apparatus for supporting a formwork for casting concrete is proposed. More specifically, a formwork supporting apparatus is installed by paratactically connecting at least one support frame (100) achieved by connecting a front and a rear vertical frame (10, 20) in a square form by a connection frame (30), so as to support a formwork, wherein the support frame (100) is connected and assembled by a front and a rear vertical assembling part (60, 70) while being vertically stacked corresponding to the height of the formwork. Therefore, during casting and curing of concrete while continuing to connect and install the formwork upward, the supporting apparatus is installed by connecting the support frame to be consecutively stacked upward instead of reinstalling a support frame on the upper position as in the prior art, and thus can significantly improve workability and convenience.

A mobile support apparatus that includes one or more extension and refraction devices and a unit that is releasably attachable to vertical members of the apparatus such that the apparatus can be extended in one or more stages to a vertical height that is substantially greater than the height of the fully retracted apparatus. The mobile support apparatus is useful for a multitude of new and existing construction-related applications.

A hoisting crane that comprises a male shaft, a female shaft, a locking shaft, a tightening spring, a hoisting arm, a pressure arm, a top shoe, a bottom shoe, a top bearing, and a bottom bearing. The crane is portable and collapsible and is equipped with an automatic adjusting tightening mechanism that fixes and secures the crane to the work room floor and ceiling using a spring and in a way that the greater the load on the crane, the more the pressure arm increases the tightening force that the crane applies to the work room floor and ceiling.