Method and apparatus for hydraulically upsetting a steel reinfor

Details Method and apparatus for hydraulically upsetting a steel reinfor Method and apparatus for hydraulically upsetting a steel reinfor

1996-06-21

1998-01-20

Crane, Daniel C.

Metal deforming

By use of non-deforming work-gripping clamp and relatively...

Clamp structure constitutes sole initial metal-deforming...

72318, 723542, 72377, B21J 508

Patent

active

057091218

ABSTRACT:
A method and a portable tool for hydraulically upsetting a steel reinforcement bar (e.g. rebar), one end of which is typically embedded in a concrete or similar structure, so that a relatively wide upset head can be formed at the protruding end to permit the bar to be reliably coupled to an opposing reinforcement bar. The protruding end of the reinforcement bar is first pre-heated and then inserted within the upsetting tool to be clamped between a plurality of articulating jaws. A pair of hydraulic pistons are driven in a first direction through a respective pair of tandem cylinders to correspondingly drive an upsetting block towards and into engagement with the pre-heated end of the reinforcement bar so as to compress the pre-heated end between the jaws and the upsetting block to form the upset head. The hydraulic pistons are then driven in an opposite direction through the tandem cylinders for causing the upsetting block to be withdrawn from the upset head at which time the jaws release the reinforcement bar to be removed from the tool.

REFERENCES:
patent: 1983618 (1934-12-01), Lamond
patent: 2047766 (1936-07-01), Bruzon
patent: 2442142 (1948-05-01), Nettenstrom
patent: 3908430 (1975-09-01), Orain
patent: 5134872 (1992-08-01), Ose

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