Penstocks

Details Penstocks Penstocks

1976-04-23

1978-02-28

Gilliam, Paul R.

Plastic and nonmetallic article shaping or treating: processes

Outside of mold sintering or vitrifying of shaped inorganic...

Including plural heating steps

49475, 49506, 264261, 264269, 427239, E02B 754

Patent

active

040758516

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.

REFERENCES:
patent: 2599440 (1952-06-01), Dudley
patent: 2683354 (1954-07-01), Marza
patent: 2782887 (1957-02-01), Zimmermann
patent: 2835924 (1958-05-01), Schmeling
patent: 2984074 (1961-05-01), Le Clair et al.
patent: 3170967 (1965-02-01), Williams et al.

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