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:
Sep. 23, 1986
Filed:
Apr. 17, 1984
John Walter, Evergreen Park, IL (US);
Donald J Roth, Westport, CT (US);
Charles S Kubis, Ewston, CT (US);
Continental Can Company, Inc., Stamford, CT (US);
Abstract
This relates to a dispenser for a hot melt material which is supplied in rod-like form from a spool and which is heated to the required semi-liquid dispensing state. The dispensing head is provided with a heating passage which provides for uniform heating of the rod-like hot melt material and there is further provided a special piston having a throughbore through which hot melt material is fed into a pumping cylinder as the piston retracts after a pumping stroke so as to eliminate in the dispensing head downstream of the piston any momentary voids. There is also a feed mechanism which will feed the hot melt material in accordance with the demand of the dispensing head and which will urge the rod-like hot melt material into the heating passage of the dispensing head under a preselected pressure so as to assure flow not only through the heating passage, but also through the piston. There are also provided means for detecting the existence of the rod-like hot melt material in advance of the feed mechanism to make certain that the apparatus be shut down when no hot melt material supply is available. There is also provided a reverse drive unit for retracting the previously fed hot melt material a short distance to relieve the build-up of pressure in the heating passage when the dispensing operation is momentarily shut down and heat is still being applied to the hot melt material disposed within the heating passage.