Metal deforming – By use of non-deforming work-gripping clamp and relatively... – Clamp structure constitutes sole initial metal-deforming...
Patent
1992-07-28
1993-12-21
Crane, Daniel C.
Metal deforming
By use of non-deforming work-gripping clamp and relatively...
Clamp structure constitutes sole initial metal-deforming...
7245315, 29237, 29243517, B21D 4104
Patent
active
052712575
DESCRIPTION:
BRIEF SUMMARY
This invention relates to pipe crimping apparatus for crimping the joints of pipe connections of the type having non-flux, non-solder joints such as those described in my co-pending patent application No. GB 8913492 in which pipe ends are provided adjacent to their ends with a collar of increased diameter over which an end of a pipe connector is fitted, said pipe connector end having been swaged to a complimentarily dimensioned diameter to fit over the pipe end, the outer end of said swaged end then being crimped over the side of the collar remote from the end of the pipe. Alternatively, the pipe ends are straight, and pipe connectors are provided in which a collar is pre-fitted into the or each swaged end of each pipe connector, and the swaged end partially crimped around said collar to retain it in position, the swaged end being fully crimped after the swaged end is fitted over one end of a pipe.
The term `swaged` is used herein to include the increasing in diameter at or adjacent to one or each end of a pipe or pipe connector by mechanical means or by the increase in diameter being formed as part of a casting of the or each end of a pipe or pipe connector.
In accordance with the present invention, a pipe crimping apparatus comprises holding means to externally engage and hold a joint formed by locating one end of a pipe connector onto a pipe end, the holding means having a crimping tool movable relative to the swaged end to cause the swaged end to be deformed and crimped onto the pipe end.
Preferably, the holding means is elongate and at one end thereof has a gripping zone to engage behind the inner side of a swaged end of the pipe connector, and at the other end thereof the crimping tool movable longitudinally towards the gripping zone and internally of the holding means, and means to cause axial movement of the tool towards the gripping zone so to engage the outer side of the swaged end and cause the swaged end to be crimped onto the pipe end. The inward axial movement of the tool preferably causes the inner side of the swaged end to be crimped to the pipe end. Alternatively, the inward movement of the tool preferably causes the outer side of the swaged end to be crimped to the pipe end. Further alternatively, the inward movement of the tool preferably causes the outer side and the inner side of the swaged end to be crimped to the pipe end.
Preferably also, the apparatus is a hand held implement having an elongate handle, at one end of which the elongate means are provided. The elongate means are preferably a pair of jaw members, each being concave and together forming a clamping zone. One or other or both of said members preferably is adapted for movement to an open position to allow the jaw members to be located around a pipe connection then closed to hold same. The crimping tool desirably is in two parts with one for each jaw member. Each part of the tool desirably is an arcuate wall which extends beyond the end remote from the gripping zone.
Preferably also, the means to cause movement of the tool is a lever mounted at the end of the jaw members remote from the gripping zone with one end adapted to engage the projecting ends of the walls. Movement means is desirably provided to cause the lever to urge the walls towards the gripping zone.
Preferably also, one jaw member is stationary with the handle, and the other member is hinged thereto. A bolt arrangement is preferably provided to urge the hinged member into a closed position with the other member. The bolt is preferably securable in said urged position.
Preferably also, the walls are mounted onto their respective members by a fastener and are each provided with a slot about their mounting to allow for restricted lengthwise movement. The projecting end of the walls are each preferably provided with an outward flange to overlie their respective member. The said one end of the lever is preferably bifurcated.
The means to move the lever may be a ram and piston arrangement operated hydraulically, pneumatically or hydro-pneumatically. Alternatively,
REFERENCES:
patent: 1101434 (1914-06-01), Hatton
patent: 1782219 (1930-11-01), Wallace
patent: 2333120 (1943-11-01), Parker
patent: 2381748 (1945-08-01), Howe
patent: 3156284 (1964-11-01), Stanley
patent: 3176495 (1965-04-01), Zane
patent: 3626450 (1971-12-01), Browne
patent: 4345361 (1982-08-01), Baumann
patent: 4835851 (1989-06-01), Peele
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