Knock down signpost
AssigneeJmb Manufacturing Pty Ltd.
InventorIan Charles Brodie
Life of this patent
Estimating the term…
Abstract
There is provided a knock down signpost comprising a post member (6) and a lower body member (10) held together by a spring (3) having a preload when the post is vertical, acting two flat surfaces (8) creating an initial resistance to motion off the horizontal. Two steel cables (114) transmit the force of the spring and are spaced apart which allows the cables to act as a non rotation mechanism. Two round protrusions (16) in the post member (6) locate into two matching clearance holes (14) in the lower body for post alignment. A shock tube (4) is fitted over the cable and internal to the spring to prevent over compression and provides a mechanical stop. As the top assembly is rotated chamfered edges (15) of the post member (6) engage and interlock into an annular groove (13) to act as a pseudo-hinge.
Claims19
A knock down signpost including:
- a lower body member having an annular bearing surface bounding a spigot portion;
- a post member having a lower annular edge corresponding to said annular bearing surface and bounding a recess adapted to receive said spigot portion, said spigot portion and recess being mutually configured to allow an articulation of said post member about an engagement of said lower annular edge and annular bearing surface in any direction, at least one of the spigot portion and recess including means for constraining initial impact movement of the post member to minimize lateral displacement;
- a pair of spaced, flexible cables passing through said lower body member and said post member, one end of each cable of said pair of cables being retained in one of said lower body member and said post member and said cables being pretensioned by tension means located in the other of said lower body member and said post member to urge said lower body and post members into mutual engagement against said articulation and providing primary circumferential alignment between said lower body member and said post member;
- and
- said post member comprising at least two round protrusions located radially inside an outer circumference of said post member and avoiding contact with an outer circumference of said lower body member, said at least two round protrusions depending from said lower body member and configured to be received in two clearance holes in said spigot portion such that when said post member rotates toward a vertical alignment in response to said cables urging said post member against said articulation said at least two round protrusions are received in said clearance holes to cause a complete return of said post to an original circumferential alignment prior to said articulation.
A knock down signpost including:
- a lower body member having an annular bearing surface bounding a spigot portion;
- a post member having a lower annular edge corresponding to said annular bearing surface and bounding a recess adapted to receive said spigot portion, said spigot portion and recess being mutually configured to allow an articulation of said post member about an engagement of said lower annular edge and annular bearing surface in any direction, at least one of the spigot portion and recess including means for constraining initial impact movement of said post member to minimize lateral displacement;
- a pair of spaced, flexible cables passing through said lower body member and said post member, one end of each cable of said pair of cables being retained in one of said lower body member and said post member and said cables being pretensioned by tension means located in the other of said lower body member and said post member to urge said lower body and post members into mutual engagement against said articulation and providing primary circumferential alignment between said lower body member and said post member;
- complementary indexing means associated with said spigot portion and recess to complete circumferential alignment between said lower body member and said post member on elastic recovery of said post member in response to said cables urging said post member against said articulation, said complementary indexing means including at least two round protrusions in the recess adapted to locate into two matching clearance holes in the spigot portion and adapted to engage in the last few degrees of horizontal to vertical rotation after the cables have done the primary work;
- and
- a plurality of equally spaced spring loaded detent latches located on an outer surface of said lower body member engaged with a ledge located on an inner surface of said post member to provide a selected initial resistance to said articulation of said post member.
Dependencies are inferred from the claim text.