Ladder base swivel with a through water channel

Details Ladder base swivel with a through water channel Ladder base swivel with a through water channel

1984-05-31

1986-08-12

Machado, Reinaldo P.

Fire escape, ladder, or scaffold

With fluid handling

285 94, F16L 2708

Patent

active

046050965

ABSTRACT:
An improved ladder base swivel with a through water channel is provided wherein an annular seal preventing passage of liquid from a cylindrical bore to the exterior of a rotatably-received mating bore is provided with a lubricant. A lubricant reservoir channel which communicates with the seal supplies lubricant to the seal to prevent the seal from drying and cracking and to minimize wearing of the seal. The reservoir also communicates with an external opening which is normally plugged, thereby serving as a water escape channel upon seal failure. Continuous hydraulic and electric circuits are provided between the rotating elements of the swivel.

REFERENCES:
patent: 2770475 (1956-11-01), Rafferty
patent: 3905450 (1975-09-01), Persson
patent: 4487435 (1984-12-01), Yamatani

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