Manually operated tool for upsetting a steel reinforcement bar

Details Manually operated tool for upsetting a steel reinforcement bar Manually operated tool for upsetting a steel reinforcement bar

1996-10-18

1998-09-01

Crane, Daniel C.

Metal deforming

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

Clamp structure constitutes sole initial metal-deforming...

723542, 72377, 7245316, B21J 718

Patent

active

057995281

ABSTRACT:
A portable tool for mechanically 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. A plurality of rotatable jaws are first moved towards and then rotated into clamping engagement against the reinforcement bar. A supply of hydraulic fluid is added to a cylinder of the tool for causing a hydraulic piston to be moved in a first direction through the cylinder to simultaneously compress a normally relaxed spring and 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 in order to form the upset head. The hydraulic fluid is then removed from the cylinder whereby the previously compressed spring expands to simultaneously drive the hydraulic piston in an opposite direction through the cylinder and pull the upsetting block away from the upset head. The jaws are then rotated out of clamping engagement with and moved away from the upset reinforcement bar so as to permit the bar to be removed from the tool.

REFERENCES:
patent: 1983618 (1934-12-01), Lamond
patent: 2766631 (1956-10-01), Van Sittert
patent: 5119667 (1992-06-01), Hollis
patent: 5134872 (1992-08-01), Ose

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