# US 11,112,282 B2 · Concealed fire detector suspension apparatus > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,112,282 B2 - Document ID: US11112282B2 - Status: Granted - Kind: B2 - Application number: 17/048,070 - Filed: 2019-05-16 - Published: 2021-04-01 - Granted: 2021-09-07 - Earliest claimed: 2018-05-18 - Applicants: Julian Vance; Steven Cliffe - Inventors: Julian Vance; Steven Cliffe - Web page: https://patentgrep.com/patent/US11112282B2 ## CPC - G01D 11/245: {Housings for sensors} - H02G 3/38: the cables or lines being installed in preestablished conduits or ducts - A62C 37/04: {with electrically-controlled release} - F21V 21/22: telescopic - G08B 17/10: Actuation by presence of smoke or gases {, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means} - G08B 17/113: Constructional details - H02G 3/22: Installations of cables or lines through walls, floors or ceilings, e.g. into buildings - H10W 78/00: Detachable holders for supporting packaged chips in operation - G01D: MEASURING NOT SPECIALLY ADAPTED FOR A SPECIFIC VARIABLE; ARRANGEMENTS FOR MEASURING TWO OR MORE VARIABLES NOT COVERED IN A SINGLE OTHER SUBCLASS; TARIFF METERING APPARATUS; MEASURING OR TESTING NOT OTHERWISE PROVIDED FOR - H02G: INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES - A62C: FIRE-FIGHTING (fire-extinguishing compositions, use of chemical substances in extinguishing fires A62D1/00; spraying, applying liquids or other fluent materials to surfaces in general B05; alarm arrangements G08B, e.g. fire alarms actuated by smoke or gases G08B17/10) - F21V: FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR - G08B: SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS - H10W: GENERIC PACKAGES, INTERCONNECTIONS, CONNECTORS OR OTHER CONSTRUCTIONAL DETAILS OF DEVICES COVERED BY CLASS H10 ## Abstract Concealed fire detector suspension apparatus has a fixing collar and a plurality of radial locking tabs insertable therethrough. A removeable fixing foot is configured for engaging a stem of an upright support for a fire detector and having a peripheral outward locking formations which mechanically interlock with corresponding inward locking formations on an inner surface of the fixing collar. In use, the apparatus is configured for installing the fixing collar via a ceiling cutout, inserting the radial locking tabs through the fixing collar from the interior thereof to clamp the ceiling, inserting the upright support through the fixing collar and locking the outward locking formations of the fixing foot to the corresponding inward locking formations of the cylindrical body, thereby supporting the upright support through the ceiling. ## Claims ### Claim 1 Concealed fire detector suspension apparatus comprising: a fixing collar having a fixing annulus and a plurality of radial locking tabs insertable through the fixing collar from an interior of the fixing collar to extend radially therefrom to clamp in opposition to the fixing annulus in use; and a removeable fixing foot configured for engaging a stem of an upright support for a fire detector and having a peripheral outward locking formations which mechanically interlock with corresponding inward locking formations on an inner surface of the fixing collar such that in use, the apparatus is configured for installing the fixing collar via a ceiling cutout, inserting the radial locking tabs through the fixing collar from the interior thereof to clamp the ceiling in opposition to the fixing annulus, inserting the upright support through the fixing collar and locking the outward locking formations of the fixing foot to the corresponding inward locking formations of the fixing collar, thereby supporting the upright support through the ceiling. ### Claim 2 (depends on 1) Apparatus as claimed in claim 1, wherein each outward locking formation comprises a protrusion profile and wherein each inward locking comprises a buttress and wherein the protrusion profile bears downwardly on the buttress. ### Claim 3 (depends on 2) Apparatus as claimed in claim 2, wherein the protrusion profile comprises an over protrusion portion and adjacent side protrusion portions which cooperate to receive an upper edge of a respective buttress therebetween. ### Claim 4 (depends on 3) Apparatus as claimed in claim 3, wherein the side protrusion portions comprise a long side protrusion portion and a short side protrusion portion such that the locking formation can be rotated over the buttress at the short side protrusion portion. ### Claim 5 (depends on 1) Apparatus as claimed in claim 1, wherein the fixing collar comprises an upper rim having a diameter less than a maximum diameter of the fixing foot. ### Claim 6 (depends on 1) Apparatus as claimed in claim 1, further comprising locking pins configured to extend radially outward from each outward locking formation to engage respective inward locking formations. ### Claim 7 (depends on 6) Apparatus as claimed in claim 6, wherein each inward locking formation comprises a buttress comprises an underside vertical notch to receive a distal end of the locking pin therein. ### Claim 8 (depends on 7) Apparatus as claimed in claim 7, wherein, when engaged at an apex of the notch, the locking pin prevents a protrusion profile of a respective outward locking formation from being lifted from the buttress. ### Claim 9 (depends on 6) Apparatus as claimed in claim 6, wherein the fixing foot has an undersurface profile that exposes proximal ends of each locking pin such that each proximal end of each locking pin can be access therethrough for pushing each locking pin radially outward. ### Claim 10 (depends on 9) Apparatus as claimed in claim 9, wherein each locking pin comprises an extension knob at a proximal end thereof. ### Claim 11 (depends on 1) Apparatus as claimed in claim 1, wherein the fixing collar comprises a male piece and a female piece which engage together to lock portions of the radial locking tabs therebetween. ### Claim 12 (depends on 11) Apparatus as claimed in claim 11, wherein each radial locking tab comprises an upright portion and a radial portion and wherein the male piece comprises the fixing annulus and wherein the male piece comprises a male cylindrical body comprising outer threading and wherein the female piece comprises a female cylindrical body comprising inner threading for the outer threading and wherein the female piece comprises slots for accommodating each radial portion therethrough. ### Claim 13 (depends on 12) Apparatus as claimed in claim 12, wherein at least one of the male piece and female piece comprises recesses to accommodate the upright portions between the male piece in the female piece. ### Claim 14 (depends on 12) Apparatus as claimed in claim 12, wherein the upright portion is semicylindrical. ### Claim 15 (depends on 12) Apparatus as claimed in claim 12, wherein the radial portion comprises a U-shaped cross-section. ### Claim 16 (depends on 1) Apparatus as claimed in claim 1, wherein each radial locking tab comprises a radial locking arrowhead bosses which interlock with corresponding apertures through the fixing collar. ### Claim 17 (depends on 1) Apparatus as claimed in claim 1, wherein, when the fixing foot is mechanically locked to the fixing collar, the fixing foot is recessed within an interior of the fixing collar and further comprising a cover plate attachable to the fixing annulus to conceal the fixing foot therein. ### Claim 18 (depends on 1) Apparatus as claimed in claim 1, wherein, the stem is telescopic. ### Claim 19 (depends on 1) Apparatus as claimed in claim 1, wherein, the fixing foot comprises radial feet each having an outward locking formation at a distal end thereof.