Triple coupler for flexible scaffold system
AssigneeNational University of Singapore
InventorsJat Yuen Richard Liew, Binbing Wang
Life of this patent
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Abstract
A coupling apparatus is comprised of three couplers for interconnecting three scaffolding members. The locking devices for the couplers may be of a bolt-and-nut configuration or, advantageously, of a wedge and arm, tapered circular wedge and arm or over-centre hand-lever.
Claims28
A coupling apparatus for interconnecting three scaffold members comprising:
- a support coupler and two connector couplers for attachment to three scaffold members;
- the support coupler having a base interconnected to the connector couplers, a lever hinged to the base, and a locking device, the base and the lever defining a pocket for laterally receiving a length of a scaffold member;
- the connector couplers each defining a pocket for receiving a length of a scaffold member and having a locking device;
- each of the locking devices being movable from a release condition, to allow a scaffold member to be positioned in or removed from the pocket, to a locked position, to secure the scaffold member in the coupler;
- wherein the pockets are oriented to secure three scaffold members at relative angles to each other.
A two coupler apparatus for interconnecting two scaffolding members wherein at least one coupler is defined by:
- a base interconnected to a second coupler;
- a lever hinged to the base, the base and the lever defining a pocket for laterally receiving a length of a scaffold member;
- an arm hinged to the base;
- the lever having an slot sized to receive the arm;
- the arm defining a hole positioned to extend beyond the lever when the arm is within the slot;
- a wedge adapted for insertion through the hole to slidably move against the lever when the arm extends within the slot to wedge the arm within the lever whereby the scaffold member is locked within the at least one coupler.
A two coupler apparatus for interconnecting two scaffolding members wherein at least one coupler is defined by:
- a base interconnected to a second coupler;
- a lever hinged to the base, the base and the lever defining a pocket for laterally receiving a length of a scaffold member;
- an arm hinged to the base, the arm having a protrusion at a free end;
- the lever having an slot adapted to receive the arm;
- a circular wedge pivotally mounted on the arm, the circular wedge circumferentially increasing in thickness to define a cam surface for engagement with the protrusion;
- the circular wedge being rotatable on the arm between the lever and the protrusion in a direction of increasing thickness to create a wedging action between the protrusion and the cam surface acting to press the lever onto the scaffold member to lock the scaffold member within the pocket.
A two coupler apparatus for interconnecting two scaffolding members wherein at least one coupler is defined by:
- a base interconnected to a second coupler;
- a lever hinged to the base, the base and the lever defining a pocket for laterally receiving a length of a scaffold member;
- an over-centre hand-lever mechanism for intercoupling the base and the lever, the over-centre hand-lever mechanism having an adjustable length and being selectively actuatable when intercoupling the base and the lever to lock the lever and the base to a scaffold member.
Dependencies are inferred from the claim text.