Metal deforming – By use of tool acting during relative rotation between tool... – During rotation of work
Reexamination Certificate
2008-05-20
2008-05-20
Tolan, Ed (Department: 3725)
Metal deforming
By use of tool acting during relative rotation between tool...
During rotation of work
C072S121000, C470S076000, C470S083000, C408S149000, C408S177000
Reexamination Certificate
active
07373796
ABSTRACT:
The invention is aimed at the provision of an automatic releasing-type rolling head for forming a tapered thread on a pipe in which the shock generated at the end of the thread rolling operation is alleviated and a thread automatic rolling roller retracting mechanism is not damaged. The rolling head includes shaft bearing plates33which are slidably supported in a plurality of guide grooves36radially provided on inner surfaces of the front and rear closures of the housing30and which are provided on their outer surfaces in the radial directions with oblique surfaces33b, thread rolling rollers35rotatably supported by the shaft bearing plates33, a cam ring31which rotates in the housing30and has cam oblique surfaces31aopposed to the oblique surfaces33bof the shaft bearing plates33, a lever44which abuts at its oblique surface against a cam member45to prevent movement thereof in association with the cam ring31and an abutment member41which is pressed and moved by a thread-rolled pipe. When the to-be-rolled pipe is thread-rolled to a predetermined length, the oblique surface of the lever44moving in association with the movement of the abutment member41is gradually moved away from the cam member45. The cam ring31is rotated and the shaft bearing plates33and the thread rolling rollers35are moved in radial and outward directions and released from the to-be-rolled pipe.
REFERENCES:
patent: 4288181 (1981-09-01), Sakaguchi et al.
patent: 4329093 (1982-05-01), Maruyama
patent: 5199928 (1993-04-01), Gress et al.
patent: 5699691 (1997-12-01), Maruyama
patent: 06-179030 (1994-06-01), None
patent: 10-34270 (1998-02-01), None
patent: 2003-126937 (2003-05-01), None
Aiura Hideyuki
Kubota Toshifumi
Maruyama Masaaki
Sakaguchi Makoto
Morrison & Foerster / LLP
Rex Industries Co., Ltd.
Tolan Ed
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