One directional rotational lance indexer

Details One directional rotational lance indexer One directional rotational lance indexer

1994-12-06

1996-10-01

Bennett, Henry A.

Liquid heaters and vaporizers

Cleaning

122390, 122391, 122392, 165 95, F22B 3718

Patent

active

055603238

ABSTRACT:
A boiler cleaning device includes a frame mounting a carriage for moving a lance in and out of a boiler along said frame. The carriage is moved by a drive-chain which passes through a differentially geared set of sprockets, one of which carries a pinion rotating a ring gear mounted on a spindle portion of the lance. The spindle has a plurality of recesses each including an abutment and a ramp while the gear carries a spring loaded plunger which engages the abutment to rotate the spindle and the lance in one direction. When the drive is reversed to move the carriage backward, the gear rotates the other direction and the plunger merely rides up the ramps and down the abutments and the spindle does not rotate.

REFERENCES:
patent: 4803959 (1989-02-01), Sherrick et al.
patent: 5320073 (1994-06-01), Silcott et al.

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