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US 5,844,148 AGranted
Detector with adjustable sampling tubes
AssigneePittway Corporation
InventorsJeffrey M. Klein, Martin L. Krause
Life of this patent
Estimating the term…
Abstract
An adjustable sampling tube construction for a duct-mounted smoke detector includes telescopic tube sections which can be fixed in overall length by a screw extending through an outer tube to fix an inner tube with respect to the outer tube. The inner tube includes air sampling holes spaced apart along its length and the outer tube includes a plurality of spaced apart through holes having a same spacing to register with the sampling holes of the inner tube. The inner tube is telescopically positionable within the outer tube to register the sampling holes with the through holes to provide air sampling locations throughout a length of the combined inner and outer tube assembly.
Claims29
A sampling tube assembly for a detector having a housing, comprising:
- a first tube section having a base end and a first distal end, said first tube section connectable to the detector housing at said base end and extending from the detector housing to said first distal end;
- a second tube section extending from said first distal end of said first tube section, and having a second distal end spaced from said first distal end, said second tube section including at least one sampling port;
- said first tube section and said second tube section arranged for adjustably varying the distance between said housing and said second distal end of said second tube section;
- and
- a plurality of holes spaced apart along a length of one of said first and second tube sections, a first portion of said first tube section and a second portion of said second tube section nested telescopically to adjust the relative overall length of said first tube section and said second tube section, and a radially extending elongate member arranged to engage one of said holes of said plurality of said holes and a fixed position on a respective other of said first tube section and said second tube section.
2 more elements
A sampling tube assembly for a detector having a housing, comprising:
- a first tube section having a base end and a first distal end, said first tube section connectable to the detector housing at said base end and extending from the detector housing to said first distal end;
- a second tube section extending from said first distal end of said first tube section, and having a second distal end spaced from said first distal end, said first tube section and said second tube section each including at least one sampling port;
- and
- said first tube section and said second tube section arranged for adjustably varying the distance between said first distal end of said first tube section and said second distal end of said second tube section.
1 more element
A sampling tube assembly for a detector having a housing, comprising:
- a first tube section having a base end and a first distal end, said first tube section connectable to the detector housing at said base end and extending from the detector housing to said first distal end;
- a second tube section extending from said first distal end of said first tube section, and having a second distal end spaced from said first distal end, said second tube section including at least one sampling port;
- said first tube section and said second tube section arranged for adjustably varying the distance between said housing and said second distal end of said second tube section;
- wherein said second tube section is sized to be at least partially nested into said first tube section, and said assembly comprising a plurality of first holes spaced apart along a length of said first tube section and a plurality of second holes spaced apart along a length of said second tube section with a same pitch as said first holes, said first tube section includes a reinforcing rib extending axially on an outside thereof, said plurality of first holes penetrating through said reinforcing rib;
- and
- a radially extending fastening member penetrating one of said first holes and one of said second holes to fix the relative axial position between said first and second tube sections.
3 more elements
A duct mountable detector, comprising:
- a detector housing including a sensing cavity;
- a first tube section connected to said detector housing open into said sensing cavity, said first tube extending to a distal end portion;
- a second tube section having a first end portion connected to said first tube section, said second tube section extending from said distal end portion of said first tube section, and having a second end opposite said first end portion, said first tube section and said second tube section each having at least one sampling port;
- and wherein said first tube section and said second tube section are connected together and are relatively adjustable for fixing the distance between said housing and said second end of said second tube section, said sampling ports of said first and second tube sections open into a common axially arranged pathway which is open into said sensing cavity.
1 more element
A duct mountable detector, comprising:
- a detector housing including a sensing cavity;
- a first tube section connected to said detector housing open into said sensing cavity, said first tube extending to a distal end portion;
- a second tube section having a first end portion connected to said first tube section, said second tube extending from said distal end portion of said first tube section, and having a second end opposite said first end portion, said second tube section having at least one sampling port open through said second tube section;
- and wherein said first tube section and said second tube section are connected together and are relatively adjustable for fixing the distance between said housing and said second end of said second tube section;
- a plurality of holes spaced apart along a length of one of said first and second tube sections, and a fastener arranged to engage one of said holes of said plurality of said holes and a fixed position on a respective other of said first tube section and said second tube section;
- wherein said plurality of holes is arranged on said second tube section, a portion of said second tube section telescopically nested inside said first tube section, and said first tube section includes at least one hole therethrough registrable with said plurality of holes at plural telescopic positions of said second tube section and said first tube section;
- and
- wherein said fastener comprises a screw fit into said hole of said first tube section and engaged into a select one of said plurality of said holes in said second tube section.
5 more elements
A duct mountable detector, comprising:
- a detector housing including a sensing cavity;
- a first tube section connected to said detector housing open into said sensing cavity, said first tube extending to a distal end portion;
- a second tube section having a first end portion connected to said first tube section, said second tube section extending from said distal end portion of said first tube section, and having a second end opposite said first end portion, said second tube section having at least one sampling port open through said second tube section;
- and wherein said first tube section and said second tube section are connected together and are relatively adjustable for fixing the distance between said housing and said second end of said second tube section;
- a plurality of holes spaced apart along a length of one of said first and second tube sections, and a fastener arranged to engage one of said holes of said plurality of said holes and a fixed position on a respective other of said first tube section and said second tube section;
- wherein said second tube section is sized to be partially nested into said first tube section, and comprising a plurality of first holes spaced apart along a length of said first tube section and a plurality of second holes spaced apart along a length of said second tube section with a same pitch as said first holes, said first tube section includes a reinforcing rib extending axially on an outside thereof, said plurality of first holes penetrating through said reinforcing rib;
- and comprising a fastener penetrating one of said first holes and one of said second holes to fix the relative axial position between said first and second tube sections.
4 more elements
Dependencies are inferred from the claim text.