US 4,375,783 AGranted

Chimney top spark arrester

OwnerLester L. Young, Thomas R. Young +1inventors

InventorsLester L. Young, Thomas R. Young, Michael A. Young

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Abstract

A spark arrester characterized by a fixed base assembly attached over the top of a chimney, a pivot assembly attached to the fixed base assembly, and a rotatable assembly rotatably coupled to the pivot assembly. The rotatable assembly is substantially cylindrically shaped having perforate sidewall portions and a perforate top portion. A vane portion of the rotatable assembly orients a windward section of the sidewall portion towards the wind, and a deflection plate attached within the sidewall portions proximate the windward section deflects the prevailing wind up through the top portion of the assembly. Co-action between the upwardly deflected wind and the underside of the vane portion creates a low pressure area over the top portion which substantially increases the draught of the chimney, resulting in reduced risk of chimney fires and an increased burn rate for airborne embers and sparks.

Claims7

Dependent claims

A chimney top spark arrester comprising:

(a) A base assembly including a solid impermeable sidewall portion, said assembly being adapted for attachment to a chimney top;
(b) A rotatable assembly including a permeable sidewall portion;
a permeable top portion;
a saddle shaped member attached to said top portion having an upper surface and an undersurface, a substantially vertical fin attached to said upper surface of said saddle shaped member to orient a windward section of said permeable sidewall portion towards a prevailing wind, said saddle shaped section being attached to said top portion proximate said windward section of said permeable sidewall portion;
and a deflection plate attached within said permeable sidewall portion proximate said windward section for deflecting wind through said top portion against said saddle shaped member to create a low pressure venturi effect at an upper surface of said top portion;
and
(c) Pivot means coupling said base assembly to said rotatable assembly whereby said rotatable assembly can freely rotate above said base assembly.

4 more elements

Dependencies are inferred from the claim text.