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US 4,681,086 AGranted
Viewing instrument for chimney
OwnerFrederic D. Van Patteninventor
Life of this patent
Estimating the term…
Abstract
An instrument for viewing the vent of a chimney while the chimney is working that includes a quartz rod that is mounted in the chimney above the flue entrance thereto. The rod is adapted to transmit light travelling down the chimney to a viewing station outside the chimney wall to provide valuable visual information concerning the condition of the chimney and the burning efficiency of the fire.
Claims8
Apparatus for visually monitoring the vent of a chimney while the chimney is drawing exhaust gases through a flue entrance that includes
- a hollow barrel unit sealed within a horizontal receiving opening passing through a wall of the chimney above the flue entrance, said barrel unit further having an adjusting means for changing the axial length of the unit whereby the barrel unit can be fitted to the chimney wall,
- mounting means removably joined to the outer end of said barrel unit to provide an airtight seal therebetween,
- an elongated quartz rod contained within the mounting means that passes through the barrel unit into the chimney vent,
- said rod having an upper light entrance face horizontally disposed at the free end thereof for receiving light from the chimney vent, a reflecting surface immediately below the light entrance face for directing entering light axially along the rod and a light exit face perpendicular to the axis of the rod which is located outside the chimney.
1 more element
Dependencies are inferred from the claim text.