Wireworking – Implements – Stretchers
Patent
1996-03-22
1997-05-20
Larson, Lowell A.
Wireworking
Implements
Stretchers
140 932, B21F 900
Patent
active
056304501
ABSTRACT:
A tool for tensioning a band and for actuating a band fastening and/or for cutting off the band at the end of the tensioning operation has a pressure-medium operated tensioning drive, a pressure-medium operated actuating drive and a valve arrangement which, when a predetermined pressure is attained at the tensioning drive, liberates the supply of pressure medium to the actuating drive. An accurately reproducible band tension is achieved by virtue of the fact that the valve arrangement comprises a reducing valve, which is connected to the tensioning drive by a pressure-medium supply line and can be set to the reducing pressure corresponding to the desired band tension. The pressure-medium supply line contains a restrictor. The valve arrangement comprises a pressure-medium actuated reversing valve, which is connected to the actuating drive and which is pressurized, with the aim of liberating the pressure-medium supply to the actuating drive, by the pressure obtaining at the tensioning drive as well as by a spring. With the opposite aim, it is pressurized by the pressure present in front of the restrictor in the pressure-medium supply line.
REFERENCES:
patent: 3254680 (1966-06-01), Caveney et al.
patent: 3508740 (1970-04-01), Palmer
patent: 3863684 (1975-02-01), Simmons
patent: 3865156 (1975-02-01), Moody et al.
patent: 4192358 (1980-03-01), Bone
Kurmis Viktor
Thieme Hans-Dieter
Larson Lowell A.
Paul Hellermann GmbH
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