CA1294698C - Frame assembly for a photocell-type smoke detector - Google Patents
Frame assembly for a photocell-type smoke detectorInfo
- Publication number
- CA1294698C CA1294698C CA000514413A CA514413A CA1294698C CA 1294698 C CA1294698 C CA 1294698C CA 000514413 A CA000514413 A CA 000514413A CA 514413 A CA514413 A CA 514413A CA 1294698 C CA1294698 C CA 1294698C
- Authority
- CA
- Canada
- Prior art keywords
- frame
- shield plate
- base
- engaging members
- holes
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
Links
Classifications
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/103—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using a light emitting and receiving device
-
- G—PHYSICS
- G08—SIGNALLING
- G08B—SIGNALLING OR CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
- G08B17/00—Fire alarms; Alarms responsive to explosion
- G08B17/10—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means
- G08B17/11—Actuation by presence of smoke or gases, e.g. automatic alarm devices for analysing flowing fluid materials by the use of optical means using an ionisation chamber for detecting smoke or gas
- G08B17/113—Constructional details
Landscapes
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Fire-Detection Mechanisms (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
ABSTRACT
A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is fastened to the base of the detector with a shield plate intervening therebetween is disclosed in which the frame has a diameter to wholly cover the surface of the shield plate and is adapted to be supported by the base through the shield plate in order to make it possible to easily and rapidly assemble the detector.
A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is fastened to the base of the detector with a shield plate intervening therebetween is disclosed in which the frame has a diameter to wholly cover the surface of the shield plate and is adapted to be supported by the base through the shield plate in order to make it possible to easily and rapidly assemble the detector.
Description
i98 The present invention relates to a ligh-t-~cattering or light-reducing type photocell-type smoke detector, and more ~ar-ticularly to a frame assembly for a photocell-type smoke detec-tor.
As a photocell-type smo~e detector there are two types, i.e. a light-scattering-type in which smoke entering a dark box scatters a light beam from a luminescent part so that light reaches the receiving part, and the other is a light-reducing type in which smoke entering the dark box shields the light beam from the luminescen-t part so that the light beam cannot reach the light receivlng part. In both types there are provided a frame having a luminescent part and a light receiving part, and a shield plate to shield from outside noise, the frame being screwed to the base of the detector with the shield plate which forms the upper surface of the dark box intervening therebetween.
Thus, since in the conventional photocell-type smoke detector the frame and the shield plate are secured to the base by means of screws assembly is troublesome and it takes a long time, reducing productivity. Further, the shield plate used as an upper surface of the dark box is made of a metallic plate tak-ing account of its function, and since it is formed so as to have a larger dimension than the frame there exists a portion that is not covered by the frame, this portlon reflecting the light beam.
Therefore, in order to prevent such reflection a dark paint for absorbing light must be applied to the shield plat~, so time for the assembly process is further increased.
- 30 The present invention prov~des a frame assembly for a photocell-type smok~ detector which allows a simple and rapid assembly to reduce the optical processes so as to improve produc-ti~ity.
In accordance with the present invention, in a photo-cell-type smokP detector in which a frame havlng a lumlnescent - 1 - ~
A
part and a light receiving part is secured to the base of the detector with a shield plate being intervened therebetween a frame assembly is provided in which the frame is dimensioned to cover the whole of the surface of the shield plate, and the engaging holes are formed therein in order for elastic engaging members previously formed on the base to pass therethrough, hook portions formed on the elastic engaging members being adapted to engage the stepped portions formed at the peripheries of the engaging holes in the frame so that the frame can be firmly secured to the base with the shield plate interven~ng between the base and the frame.
Since the frame assembly for a photocell-type smoke detector in accordance with the present invention has such a con-stitution as stated above, on assembly, after the shield plate isput on the base, when the frame is put on the shield plate the engaging members of the base pass through the holes for the engaging members formed in the frame, the hook portions formed on the engaging members engage the stepped portions formed around the peripheries of the holes so that the frame is securely fixed to the base with the shield plate intervening therebetween, and at the same time the whole of the shield plate is covered by the frame.
: 25 Thus, according to onP aspect thereof the present invention pro~ides a frame assembly for a photocell-type smo~e detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a sh~eld plate, in which said shield plate i5 metallic, said frame is configured and dimensioned to wholly cover the shield plate, and means is provided for removably fastening said frame to said base ~ith said shield plate intervening therebetween, said frame, said shield plate and said base remaining separate and distinct ele-ments removable from one another upon unfastening of said fasten-ing means. Sultably said fastening means comprises a pair ofelastically deformable engaging members formed on sald base, each .~
member having a hook portion formed at its end portion, holes being formed in said frame for passage of said engaging members so as to enable said hook portions to pass therethrough, and stepped portions formed on the peripheries of said holes so as to engage said hook portions. Desirably said means to fasten said frame to said base comprises a pair of elastically deformable engaging members formed on said frame, each member having a hook portion formed at its end portion, holes being formed in said base for passage of said engaging members so as to enable said hook portions to pass through them, and stepped port~ons formed ln sald base on the peripheries of said holes so as to engage said hook portions. Suitably said shield plate is formed with holes for passage of said engaging members which serve to enable said hook portions of said engaging members formed on said b~se to pass therethrough.
In another aspect thereof the present invention pro-vides a frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a shield plate, in which said frame is configured and dimensioned to wholly cover the shield plate, means is provided for removably fastening said frame to said base with said shield plate intervening therebe-tween, and said shield plate is formed with holes for passage therethrough of said fastening means, said ~rame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means.
In a still further aspect thereof the present lnvention provides a frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a plate, characterized by said frame being configured and dimensioned to wholly cover the shield plate, and said asssmbly having means for removably fastening said frame to said base with said shield plate intervening therebetween comprising a pair of elastically A
deformable engaging members found on said base, each member hav-ing a hook portion formed at its free end portlon, holes being formed in said frame and in said shield plate for passage of said engaging members so as to enable said hook portions to pass therethrough, said frame, said shield plate and said base remain-ing separate and distinct elements removable from one another upon unfastening of said fastening means.
The present lnvention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a verti~al sectional view of one embodimentof the present invention;
Fig. 2 is a plan view of the base shown in Fig., l;
Fig. 3 is a plan view of the shield plate shown in Fig.
l; and Fig. 4 is a plan view of the frame shown in Fig. 1.
- 3a -A
~ FA-7644 Best Mode for Carrying Out the Invention Now the present invention will he explained in reference to the attached drawings wherein is indicated one embodiment of the present invention.
' Referring now to Fig. 1 of the drawings wherein the reference numeral,l indicates a photocell-type smo~e detector embodying the present 1nvention~, the detector ' }llustrated bsing a 11ght-scattering type. Numeral 2 lS .
a base of the detector which has an integral shield case 3 ~and pr1nted circuit board 4.~ Ths base 2 is, as shown ;,~-' in Figs. l and Z, provided with revsiving portions 5 for receiving the terminals~of a luminescent element and a .
light recs1ving element,~a pair of engaging hole~s 7 for ' ~ ~ -elastically engaging'and~ holding the hook portions of a dark box~6, the~ho~les ~7~bsing oppos1tely d1sposed radially, and a pair of elastic engaging;members-8 similarly~
oppos~itsly~d1sposed rad~sll~y.~ Thsse engsg1ng msmbers 8 sre~elastica11y deformab1e~and havs~hook portions 9 formed~
at their~end~por;tions~respectively~ each projecting radially ,inwards.~ A frame 11 is se~cured~to the base 2 with a shield~
p1ate~ 0 ~nts~rvsn1ng thsrebstwssn. The shis]d p1ats 10 is, as~shown~n~Fig.-3,~ made of a circular;metallic plate having~
a dlameter d, and,'this~shis~1d~p1ate~;10~is, a5,,shown in Figs~. 1 and~3~,~formed~with~a pa~ir of holes 12 for introducing the engsging~members~8~;formed on~the~bass 2, and rece~ving holes~
~: :
lZ94~i9~3 ..
13 for inserting the pro~ecting portions of a luminescent part 14 and a light receiving part 15 provided on the frame 11, respectively. The frame 11 is, as shown in Figs. 1 and 4, of a circul.ar disk configuration having the same diameter d as that of the shield plate~ 10 so as to wholly cover the shield plate 10, and is provided at its under surface with the~luminescent part 14 and the light receiving .
part 15, a pair of holes 16 for receiving-the engaging members 3 formed on the base 2 being formed so as.to pass .
.:: them therethrough.
The optical axes.of.the luminescent part 14 and the ; l.ight receiving part 15 are inclined so as to-intersect at a predetermlned angle. On the radially inward edges of the holes 16 for the~engaging members 8 are formed stepped portions 17, resp~ectlvely,to engage the.hook portions 9 of the engaging portions 8j respectively. The black`box 6 comprises~, as shown in Fig. l, a protect cover 13, an nsect screen19, and a~labyrinth 20, and-it is in communicatlon w;ith the atmosphere.~Further, in ~ig. 1 the reference numeral~21 indicates a~monltorlng.space, 22 a lens mounted in fron~t~of~the:luminescent element, and.23 a ceiling to :
which~the smoke~detec~tor^l is mounted. . ~:
Next the:operation~of the present invnetion having sucb~a ;~-n3tit-tl0n ~st~ted at~ve~will b, explained.
~',.~:~ ::: :
: ~
; .
~ ~ ' ~2~t~L6~8 First the shield.plate 10 is put on the base 2 and.
the engaging members 8 of the base 2 are introduced into the holes 12 formed in the shield plate 10. Thereafter the frame 11 is placed on the shield plate 10 by passing : the engaging members 8 formed in the base 2 through the : holes 16 formed in the frame ll respectively. The hook ~ portions 9 of the enga`ging members 8.of the base 2 are ~ therefore elastically radially urged outwards.by the inner.
peripheries of the holes 16.for.the engaging members 8, : respectively, and upon passing through the holes 16, the ~; hook portions 9.project over the surface of the frame 11, and:the hook portions 9 abut the stepped portions 17 owing to their elastic, thus firmly pressing and securing the :~; frame 11 to the base 2 ~y the engagement of the engaging ~: members 8 with the stepped portions 17.of the frame 11.
At the same time the shield plate.lO-is interposed between ; the~frame 11 and the base.2,.and the whole surface of the shleld plate lb i5 covered by the frame 11.
: It will be~appreciated that the:present invention is ~. ~
~ not~llmited to the embodiment descrobed.abpve and illustrated.
: :~ ~:: ,: . .
;: For example, the~elastically deformable.hoo~ portions 9 of the base 2 and the step-~ed portions 17 formed around the holes 16 of the frame 11 to be engaged by them may instead be~provided on the frame `11 and on the base 2, respectively.
6~-,:
:
129~
Since the present invention has such a constitution and operation the frame can be secured to the base with the shield plate intervening therebetween by merely putting the shield plate on the frame and urginy them against the base. Therefore, since in ~ccordance with the present invention no screwing is re~uired for assembly contrary to the conventional smok~ detector of this kind. the asembly can be done simply and rapidly, remarkably~improving the productivity. Further, since the frame entirely covers the surface of.the~shield platè the.plate need not be :
' darkly coloured.to.absorb~liyht contrary to the conventlonal- smoke.detectors~of this kind, such painting - .
operation being el~lminated to.thereby increases productivity.
.
.
As a photocell-type smo~e detector there are two types, i.e. a light-scattering-type in which smoke entering a dark box scatters a light beam from a luminescent part so that light reaches the receiving part, and the other is a light-reducing type in which smoke entering the dark box shields the light beam from the luminescen-t part so that the light beam cannot reach the light receivlng part. In both types there are provided a frame having a luminescent part and a light receiving part, and a shield plate to shield from outside noise, the frame being screwed to the base of the detector with the shield plate which forms the upper surface of the dark box intervening therebetween.
Thus, since in the conventional photocell-type smoke detector the frame and the shield plate are secured to the base by means of screws assembly is troublesome and it takes a long time, reducing productivity. Further, the shield plate used as an upper surface of the dark box is made of a metallic plate tak-ing account of its function, and since it is formed so as to have a larger dimension than the frame there exists a portion that is not covered by the frame, this portlon reflecting the light beam.
Therefore, in order to prevent such reflection a dark paint for absorbing light must be applied to the shield plat~, so time for the assembly process is further increased.
- 30 The present invention prov~des a frame assembly for a photocell-type smok~ detector which allows a simple and rapid assembly to reduce the optical processes so as to improve produc-ti~ity.
In accordance with the present invention, in a photo-cell-type smokP detector in which a frame havlng a lumlnescent - 1 - ~
A
part and a light receiving part is secured to the base of the detector with a shield plate being intervened therebetween a frame assembly is provided in which the frame is dimensioned to cover the whole of the surface of the shield plate, and the engaging holes are formed therein in order for elastic engaging members previously formed on the base to pass therethrough, hook portions formed on the elastic engaging members being adapted to engage the stepped portions formed at the peripheries of the engaging holes in the frame so that the frame can be firmly secured to the base with the shield plate interven~ng between the base and the frame.
Since the frame assembly for a photocell-type smoke detector in accordance with the present invention has such a con-stitution as stated above, on assembly, after the shield plate isput on the base, when the frame is put on the shield plate the engaging members of the base pass through the holes for the engaging members formed in the frame, the hook portions formed on the engaging members engage the stepped portions formed around the peripheries of the holes so that the frame is securely fixed to the base with the shield plate intervening therebetween, and at the same time the whole of the shield plate is covered by the frame.
: 25 Thus, according to onP aspect thereof the present invention pro~ides a frame assembly for a photocell-type smo~e detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a sh~eld plate, in which said shield plate i5 metallic, said frame is configured and dimensioned to wholly cover the shield plate, and means is provided for removably fastening said frame to said base ~ith said shield plate intervening therebetween, said frame, said shield plate and said base remaining separate and distinct ele-ments removable from one another upon unfastening of said fasten-ing means. Sultably said fastening means comprises a pair ofelastically deformable engaging members formed on sald base, each .~
member having a hook portion formed at its end portion, holes being formed in said frame for passage of said engaging members so as to enable said hook portions to pass therethrough, and stepped portions formed on the peripheries of said holes so as to engage said hook portions. Desirably said means to fasten said frame to said base comprises a pair of elastically deformable engaging members formed on said frame, each member having a hook portion formed at its end portion, holes being formed in said base for passage of said engaging members so as to enable said hook portions to pass through them, and stepped port~ons formed ln sald base on the peripheries of said holes so as to engage said hook portions. Suitably said shield plate is formed with holes for passage of said engaging members which serve to enable said hook portions of said engaging members formed on said b~se to pass therethrough.
In another aspect thereof the present invention pro-vides a frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a shield plate, in which said frame is configured and dimensioned to wholly cover the shield plate, means is provided for removably fastening said frame to said base with said shield plate intervening therebe-tween, and said shield plate is formed with holes for passage therethrough of said fastening means, said ~rame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means.
In a still further aspect thereof the present lnvention provides a frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a plate, characterized by said frame being configured and dimensioned to wholly cover the shield plate, and said asssmbly having means for removably fastening said frame to said base with said shield plate intervening therebetween comprising a pair of elastically A
deformable engaging members found on said base, each member hav-ing a hook portion formed at its free end portlon, holes being formed in said frame and in said shield plate for passage of said engaging members so as to enable said hook portions to pass therethrough, said frame, said shield plate and said base remain-ing separate and distinct elements removable from one another upon unfastening of said fastening means.
The present lnvention will be further illustrated by way of the accompanying drawings, in which:-Fig. 1 is a verti~al sectional view of one embodimentof the present invention;
Fig. 2 is a plan view of the base shown in Fig., l;
Fig. 3 is a plan view of the shield plate shown in Fig.
l; and Fig. 4 is a plan view of the frame shown in Fig. 1.
- 3a -A
~ FA-7644 Best Mode for Carrying Out the Invention Now the present invention will he explained in reference to the attached drawings wherein is indicated one embodiment of the present invention.
' Referring now to Fig. 1 of the drawings wherein the reference numeral,l indicates a photocell-type smo~e detector embodying the present 1nvention~, the detector ' }llustrated bsing a 11ght-scattering type. Numeral 2 lS .
a base of the detector which has an integral shield case 3 ~and pr1nted circuit board 4.~ Ths base 2 is, as shown ;,~-' in Figs. l and Z, provided with revsiving portions 5 for receiving the terminals~of a luminescent element and a .
light recs1ving element,~a pair of engaging hole~s 7 for ' ~ ~ -elastically engaging'and~ holding the hook portions of a dark box~6, the~ho~les ~7~bsing oppos1tely d1sposed radially, and a pair of elastic engaging;members-8 similarly~
oppos~itsly~d1sposed rad~sll~y.~ Thsse engsg1ng msmbers 8 sre~elastica11y deformab1e~and havs~hook portions 9 formed~
at their~end~por;tions~respectively~ each projecting radially ,inwards.~ A frame 11 is se~cured~to the base 2 with a shield~
p1ate~ 0 ~nts~rvsn1ng thsrebstwssn. The shis]d p1ats 10 is, as~shown~n~Fig.-3,~ made of a circular;metallic plate having~
a dlameter d, and,'this~shis~1d~p1ate~;10~is, a5,,shown in Figs~. 1 and~3~,~formed~with~a pa~ir of holes 12 for introducing the engsging~members~8~;formed on~the~bass 2, and rece~ving holes~
~: :
lZ94~i9~3 ..
13 for inserting the pro~ecting portions of a luminescent part 14 and a light receiving part 15 provided on the frame 11, respectively. The frame 11 is, as shown in Figs. 1 and 4, of a circul.ar disk configuration having the same diameter d as that of the shield plate~ 10 so as to wholly cover the shield plate 10, and is provided at its under surface with the~luminescent part 14 and the light receiving .
part 15, a pair of holes 16 for receiving-the engaging members 3 formed on the base 2 being formed so as.to pass .
.:: them therethrough.
The optical axes.of.the luminescent part 14 and the ; l.ight receiving part 15 are inclined so as to-intersect at a predetermlned angle. On the radially inward edges of the holes 16 for the~engaging members 8 are formed stepped portions 17, resp~ectlvely,to engage the.hook portions 9 of the engaging portions 8j respectively. The black`box 6 comprises~, as shown in Fig. l, a protect cover 13, an nsect screen19, and a~labyrinth 20, and-it is in communicatlon w;ith the atmosphere.~Further, in ~ig. 1 the reference numeral~21 indicates a~monltorlng.space, 22 a lens mounted in fron~t~of~the:luminescent element, and.23 a ceiling to :
which~the smoke~detec~tor^l is mounted. . ~:
Next the:operation~of the present invnetion having sucb~a ;~-n3tit-tl0n ~st~ted at~ve~will b, explained.
~',.~:~ ::: :
: ~
; .
~ ~ ' ~2~t~L6~8 First the shield.plate 10 is put on the base 2 and.
the engaging members 8 of the base 2 are introduced into the holes 12 formed in the shield plate 10. Thereafter the frame 11 is placed on the shield plate 10 by passing : the engaging members 8 formed in the base 2 through the : holes 16 formed in the frame ll respectively. The hook ~ portions 9 of the enga`ging members 8.of the base 2 are ~ therefore elastically radially urged outwards.by the inner.
peripheries of the holes 16.for.the engaging members 8, : respectively, and upon passing through the holes 16, the ~; hook portions 9.project over the surface of the frame 11, and:the hook portions 9 abut the stepped portions 17 owing to their elastic, thus firmly pressing and securing the :~; frame 11 to the base 2 ~y the engagement of the engaging ~: members 8 with the stepped portions 17.of the frame 11.
At the same time the shield plate.lO-is interposed between ; the~frame 11 and the base.2,.and the whole surface of the shleld plate lb i5 covered by the frame 11.
: It will be~appreciated that the:present invention is ~. ~
~ not~llmited to the embodiment descrobed.abpve and illustrated.
: :~ ~:: ,: . .
;: For example, the~elastically deformable.hoo~ portions 9 of the base 2 and the step-~ed portions 17 formed around the holes 16 of the frame 11 to be engaged by them may instead be~provided on the frame `11 and on the base 2, respectively.
6~-,:
:
129~
Since the present invention has such a constitution and operation the frame can be secured to the base with the shield plate intervening therebetween by merely putting the shield plate on the frame and urginy them against the base. Therefore, since in ~ccordance with the present invention no screwing is re~uired for assembly contrary to the conventional smok~ detector of this kind. the asembly can be done simply and rapidly, remarkably~improving the productivity. Further, since the frame entirely covers the surface of.the~shield platè the.plate need not be :
' darkly coloured.to.absorb~liyht contrary to the conventlonal- smoke.detectors~of this kind, such painting - .
operation being el~lminated to.thereby increases productivity.
.
.
Claims (4)
1. A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a shield plate, in which said shield plate is metallic, said frame is configured and dimensioned to wholly cover the shield plate, and means is provided for removably fastening said frame to said base with said shield plate intervening therebetween, said frame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means, said fastening means comprising a pair of elastically deformable engaging members formed on said base, each member having a hook portion formed at its end portion, holes being formed in said frame for passage of said engaging members so as to enable said hook portions to pass therethrough, and stepped portions formed on the peripheries of said holes so as to engage said hook portions, and said shield plate being formed with holes for passage of said engaging members which serve to enable said hook portions of said engaging members formed on said base to pass therethrough whereby the shield plate need not be darkly colored.
2. A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a shield plate, in which said shield plate is metallic, said frame is configured and dimensioned to wholly cover the shield plate, and means is provided for removably fastening said frame to said base with said shield plate intervening therebetween, said frame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means; said means to fasten said frame to said base comprising a pair of elastically deformable engaging members formed on said frame, each member having a hook portion formed at its end portion, holes being formed in said base for passage of said engaging members so as to enable said hook portions to pass through them, and stepped portions formed in said base on the peripheries of said holes so as to engage said hook portions, said shield plate being formed with holes for passage of said engaging members which serve to enable said hook portions of said engaging members formed on said base to pass therethrough.
3. A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base through a shield plate, in which said frame is black and is configured and dimensioned to wholly cover the shield plate, means is provided for removably fastening said frame to said base with said shield plate intervening therebetween, and said shield plate is a color other than black and formed with holes for passage therethrough of said fastening means, said frame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means.
4. A frame assembly for a photocell-type smoke detector wherein a frame provided with a luminescent part and a light receiving part is secured to a base-through a shield plate, which said shield plate is of a color other than black, said frame is painted black and configured and dimensioned to wholly cover the shield plate, and said assembly has means for removably fastening said frame to said base with said shield plate intervening therebetween comprising a pair of elastically deformable engaging members found on said base, each member having a hook portion formed at its free end portion, holes being formed in said frame and in said shield plate for passage of said engaging members so as to enable said hook portions to pass therethrough, said frame, said shield plate and said base remaining separate and distinct elements removable from one another upon unfastening of said fastening means.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1985111991U JPH0434442Y2 (en) | 1985-07-22 | 1985-07-22 | |
| JP111991/1985 | 1985-07-22 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1294698C true CA1294698C (en) | 1992-01-21 |
Family
ID=14575204
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000514413A Expired - Fee Related CA1294698C (en) | 1985-07-22 | 1986-07-22 | Frame assembly for a photocell-type smoke detector |
Country Status (5)
| Country | Link |
|---|---|
| EP (1) | EP0233294B1 (en) |
| JP (1) | JPH0434442Y2 (en) |
| CA (1) | CA1294698C (en) |
| DE (1) | DE3688131T2 (en) |
| WO (1) | WO1987000667A1 (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63163698A (en) * | 1986-12-26 | 1988-07-07 | ホーチキ株式会社 | Scattered light type smoke sensor |
| EP0569712B1 (en) * | 1992-04-25 | 1998-03-04 | Nohmi Bosai Ltd. | Fire detector |
| ES2451915R1 (en) | 2012-09-27 | 2014-06-02 | Utc Fire & Security Americas Corporation, Inc. | MODULAR SMOKE DETECTION SYSTEM AND PROCEDURE FOR MOUNTING A SMOKE DETECTION SYSTEM |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE2434178C2 (en) * | 1974-07-16 | 1983-12-08 | Matsushita Electric Works, Ltd., Kadoma, Osaka | Smoke alarm device based on the light scattering principle |
| JPS54136981U (en) * | 1978-03-15 | 1979-09-22 | ||
| DE2830532A1 (en) * | 1978-07-12 | 1980-01-31 | Eichenauer Fa Fritz | ELECTRIC RADIATOR FOR FLUID MEDIA |
| FR2454661A1 (en) * | 1979-04-20 | 1980-11-14 | Hochiki Co | Fire detector coupling mechanism - has mounting plate with locating elements and terminal connections for detector head |
| JPS5721119U (en) * | 1980-07-03 | 1982-02-03 | ||
| JPS5812316U (en) * | 1981-07-14 | 1983-01-26 | 村田 信夫 | Western umbrella |
-
1985
- 1985-07-22 JP JP1985111991U patent/JPH0434442Y2/ja not_active Expired
-
1986
- 1986-07-22 CA CA000514413A patent/CA1294698C/en not_active Expired - Fee Related
- 1986-07-22 DE DE86904401T patent/DE3688131T2/en not_active Expired - Fee Related
- 1986-07-22 EP EP86904401A patent/EP0233294B1/en not_active Expired - Lifetime
- 1986-07-22 WO PCT/JP1986/000388 patent/WO1987000667A1/en active IP Right Grant
Also Published As
| Publication number | Publication date |
|---|---|
| DE3688131T2 (en) | 1993-11-18 |
| EP0233294B1 (en) | 1993-03-24 |
| DE3688131D1 (en) | 1993-04-29 |
| EP0233294A4 (en) | 1989-03-16 |
| EP0233294A1 (en) | 1987-08-26 |
| JPH0434442Y2 (en) | 1992-08-17 |
| JPS6220359U (en) | 1987-02-06 |
| WO1987000667A1 (en) | 1987-01-29 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CA2094736C (en) | Fire detector | |
| JP2654073B2 (en) | Embedded sensor base | |
| US4851819A (en) | Photoelectric smoke detector with permanently fixed insect net | |
| CA2202599C (en) | Trim support for recessed lighting fixture | |
| US5768649A (en) | Lens assembly with engageable lens retainer and lens mount | |
| CA1269970A (en) | Bracket for mounting a fixture on a wall | |
| US4510559A (en) | Lamp and filter mounting assembly | |
| AU6963800A (en) | Photoelectric smoke detector, and smoke detection section assembly | |
| CA1294698C (en) | Frame assembly for a photocell-type smoke detector | |
| CA1267708A (en) | Fire detector | |
| CA2345912A1 (en) | Recessed downlight wall wash reflector assembly and method | |
| US4584485A (en) | Optical block in smoke detectors | |
| US5791769A (en) | Halogen lampshade | |
| US5655877A (en) | Ceiling fan housing assembly | |
| CN210865011U (en) | Smoke sensor with optical labyrinth structure | |
| AU3332797A (en) | Smoke detector | |
| US5797721A (en) | Ceiling fan housing having light device | |
| US5672048A (en) | Ceiling fan housing | |
| EP0231390B1 (en) | Assembly for mounting light-emitting element and light-receiving element in photoelectric smoke sensor | |
| US4679231A (en) | Telephone accessory housing | |
| GB2158573A (en) | Scattered-light type smoke detector | |
| JPH0652713A (en) | Globe mounting device in luminaire | |
| US4657309A (en) | Wire wheel cover | |
| US5145089A (en) | Structure of pan cover | |
| JPH026713Y2 (en) |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |