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. 28, 1978
Filed:
Apr. 23, 1976
Frederick Basil Gardner, Redditch, EN;
Simon-Hartley Limited, , EN;
Abstract
A penstock comprising a frame having an opening therein and a door slidable within the frame across said opening to close same by vertical movement between fixed vertical guide members slidably engaging the side edge regions of said door, wherein at least one of said members at each side forms a resilient vertical seal, said penstock including a base invert seal which is produced by temporarily and at least partially compressing said resilient vertical seal, forming a pad of resilient material onto which the lower edge of the door in use will close and causing said resilient material to form a seal around the lower end region of the resilient vertical seal prior to releasing the temporary compressive force applied to the latter, the resilient pad being preferably formed by introducing the material in liquid form into a channel defined by limit strips such that the liquid flows around the lower end region of said resilient vertical seal to become bonded thereto, said compressive force being maintained until the liquid is cured.