The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 24, 1981
Filed:
Oct. 26, 1978
Applicant:
Inventor:
Enno H Page, Toledo, OH (US);
Assignee:
NL Industries, Inc., Hightstown, NJ (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B22D / ;
U.S. Cl.
CPC ...
164155 ; 164-4 ; 164312 ; 425145 ;
Abstract
In a casting machine using an injection ram, the ram movements are measured accurately and reliably in spite of adverse ambient conditions by a special sensing arrangement located inside the hydraulic drive cylinder which drives the ram. A sonic energy pulse is generated in a waveguide near the hydraulic piston. This pulse propagates along the waveguide to a transducer at the cylinder wall. The time required for this pulse propagation corresponds to the position of the piston and hence of the injection ram.