Agitating – Rubber or heavy plastic working – Stirrer is through-pass screw conveyor
Reexamination Certificate
1999-09-09
2001-05-08
Cooley, Charles E. (Department: 1723)
Agitating
Rubber or heavy plastic working
Stirrer is through-pass screw conveyor
C366S079000
Reexamination Certificate
active
06227693
ABSTRACT:
FIELD OF THE INVENTION
This invention relates to a multi-shaft screw-type machine.
BACKGROUND OF THE INVENTION
To permit the axially tandem-mounted screw elements to intermesh tightly on the axis-parallel shafts of such a machine, they must be positioned reliably on the shafts in the axial direction with the highest precision. For this purpose the screw elements are disposed in axially displaceable fashion on the shaft, e.g. with a splining, and connected with the shaft so as to rotate in unison. The screw elements are tightly prestressed axially on the shaft, with the shaft tip, which is accordingly formed as a screw bolt, screwed into an axial threaded bore in the shaft end.
The stop can be formed, for example, by a collar created by turning off the shaft on the lathe. Since such a collar involves enormous production effort, it is also known to provide the shaft with a ring groove receiving a split stop ring. However, such a stop ring in a ring groove of the shaft does not allow the desired precision to be attained in view of the high axial loads acting on the screw shafts, in particular, the high axial pressure.
SUMMARY OF THE INVENTION
The problem solved by this invention is to ensure in simple fashion a lasting positioning of the screw elements in the axial direction with the highest precision in all operating states of the machine.
Specifically, this invention is directed to a screw-type machine with plural shaft assemblies. Each shaft assembly includes an elongated shaft. One or more screw elements are fitted to the shaft. The screw elements rotate in unison with the shaft and are able to move along the length of the shaft. A stop assembly is fitted to one end of the shaft. The stop assembly is positioned to abut one of the screw elements to prevent movement of the screw elements along the shaft. The stop assembly includes a stop ring that is seated in a groove formed in the shaft. Each shaft assembly also includes a straining ring that is fitted over the shaft. The straining ring engages a screw thread formed in the shaft. The straining ring is positioned to abut the stop ring. The abutment of the straining ring against the stop ring prevents displacement of the stop ring which could result in displacement of the screw elements.
REFERENCES:
patent: 4527899 (1985-07-01), Blach et al.
patent: 5476319 (1995-12-01), Blach
Blach Josef A.
Blach Markus
Blach Michael
Cooley Charles E.
Flynn ,Thiel, Boutell & Tanis, P.C.
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