US 3,933,969 AGranted

Hollow reinforced concrete fence post and method and apparatus for making the same

OwnerFrank R. Robinson, Frank S. Robinsoninventors

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Abstract

A wire reinforced hollow core concrete fence post is made by injecting concrete into a form in which is centrally supported a longitudinally extending mandrel having a plurality of radially extending spacers extending longitudinally along its surface, the spacers being adapted to support a cylindrical tube of wire mesh reinforcing remote from the surface of the mandrel. A pallet board is disposed in the bottom of the form for supporting the concrete injected therein. Means are provided to rotate the manadrel and the tube of wire mesh reinforcing while the concrete is being injected into the form. Means are also provided to withdraw the mandrel from the form after the concrete has been injected, while retaining the concrete and the reinforcing within the form. After the mandrel has been withdrawn, a pusher is engaged with the end of the mandrel to push the pallet board and the concrete in the shape of the post with the tube of wire mesh reinforcing disposed therein, out of the form and onto a pallet mounted on a movable carriage. Means are provided to move the pallet and the carriage transversely of the form to allow space for receiving a subsequent post. An apparatus for forming the wire mesh reinforcing into a tube is also disclosed.

Claims1

Dependent claims

A method of making wire reinforced hollow concrete fence posts, comprising

placing a mandrel in an elongated horizontally positioned form having the general external shape of a fence post to be made;
placing a cylindrical tube of wire mesh over said mandrel and supporting said tube remote from the surface of said mandrel on spacers attached longitudinally to said surface of said mandrel, said tube being formed with means for engaging said spacers on said surface of said mandrel upon rotation thereof;
injecting concrete into said form between said mandrel and said form while simultaneously rotating said mandrel together with said tube of wire mesh, said tube being rotated with said mandrel by positive engagement of one of said spacers on said surface of said mandrel with said engaging means on said tube,
said form remaining stationary, to cause said concrete thoroughly to fill the interstices in said mesh, said injecting and said rotating continuing until the space between said mandrel and said form is filled with said concrete;
longitudinally withdrawing said mandrel from said form while retaining said concrete and said tube of wire mesh within said form;
and
pushing said concrete and said tube of wire mesh longitudinally out of said form onto a receiving means, said mesh supporting said concrete until the same has set.

4 more elements

Dependencies are inferred from the claim text.

Facts

Application: 05/460,759Filed 15 Apr 1974
Granted: 20 Jan 1976
Term ends: Not estimatedThe source records don’t support an estimate.

Classification6 codes

B28B 23/18
Wherein the elements are reinforcing members: for the production of elongated articles
B28B 1/20
Producing shaped prefabricated articles from the material: by centrifugal or rotational casting
B28B 7/166
Moulds for making shaped articles with cavities or holes open to the surface , e.g. with blind holes: for oblong articles, e.g. hollow masts
Y10S 264/43
Plastic and nonmetallic article shaping or treating: processes: processes of curing clay and concrete materials