Metal working – Method of mechanical manufacture – Prime mover or fluid pump making
Reexamination Certificate
2005-12-06
2005-12-06
Compton, Eric (Department: 3726)
Metal working
Method of mechanical manufacture
Prime mover or fluid pump making
C029S888410, C029S888400, C417S451000, C417S565000
Reexamination Certificate
active
06971168
ABSTRACT:
A method of manufacturing a compressor valve plate (36) comprises at least the following steps in succession: blanking of a blank of the plate (36) from a steel sheet of suitable thickness, punching holes corresponding to the output and intake openings, the hole corresponding to the output opening being a preliminary hole (48a) having a diameter larger than the final diameter of this opening (48), forming, by coining, a depression (42) for housing an output valve-closure blade (54), with the depth of the depression increasing towards the end of the depression which corresponds to the preliminary hole (48a), in a manner such that, during the coining, at least some of the material of the blank creeps towards the preliminary hole, partially filling it, calibrating the output opening (48) to the final diameter by punching, and coining an annular projection (50) around the calibrated output opening (48) to define a valve seat for the output closure blade.
REFERENCES:
patent: 4642037 (1987-02-01), Fritchman
patent: 5035050 (1991-07-01), Cowen
patent: 5328338 (1994-07-01), Hirano et al.
patent: 6026721 (2000-02-01), Fukai
patent: 4039786 (1992-06-01), None
patent: 0 874 155 (1998-10-01), None
patent: 07 024 544 (1995-01-01), None
Compton Eric
Embraco Europe S.r.l.
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