U.S. patent number 3,905,063 [Application Number 05/368,827] was granted by the patent office on 1975-09-16 for condition responsive door holder-closer.
This patent grant is currently assigned to Rixson-Firemark, Inc.. Invention is credited to Gordon L. Coulter, Duane D. Pearsall.
United States Patent |
3,905,063 |
Coulter , et al. |
* September 16, 1975 |
Condition responsive door holder-closer
Abstract
A surface-mounted door holder-closer responsive to the
particulate products of combustion passing through multiple
passageways formed in a holder-closer housing cover, a
holder-closer assembly frame, and a dark chamber which is an
integral part of a photocell particle detector module. The particle
detector module is insertable into the holder-closer frame with the
frame and dark chamber walls not only defining the passageways, but
also isolating the chamber from spurious light entering the chamber
which would render a false alarm or false emergency door release.
The frame also houses the principal components of the
holder-closer, namely, a closer spring, a dashpot, a latching lever
assembly, and an electromagnet responsive to modulated output
current flow from the dark chamber to effect alarm or emergency
release of the latching lever to close an otherwise open door. The
integrated detector-holder-closer is advantageously and simply
mounted on the lintel or header of a door frame.
Inventors: |
Coulter; Gordon L. (Arlington
Heights, IL), Pearsall; Duane D. (Morrison, CO) |
Assignee: |
Rixson-Firemark, Inc. (Franklin
Park, IL)
|
[*] Notice: |
The portion of the term of this patent
subsequent to December 11, 1990 has been disclaimed. |
Family
ID: |
26910775 |
Appl.
No.: |
05/368,827 |
Filed: |
June 11, 1973 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
|
|
216202 |
Jan 7, 1972 |
3777423 |
|
|
|
Current U.S.
Class: |
16/48.5; 49/31;
340/630 |
Current CPC
Class: |
A62C
2/12 (20130101); E05F 3/222 (20130101); E05Y
2201/462 (20130101); E05Y 2400/45 (20130101); E05F
2003/228 (20130101); Y10T 16/22 (20150115); E05F
1/006 (20130101); E05Y 2201/474 (20130101); E05Y
2900/132 (20130101); E05Y 2800/25 (20130101); E05F
15/72 (20150115) |
Current International
Class: |
E05F
3/00 (20060101); A62C 2/00 (20060101); A62C
2/12 (20060101); E05F 3/22 (20060101); E05F
1/00 (20060101); E05F 15/20 (20060101); E05F
015/20 () |
Field of
Search: |
;16/48.5 ;49/1,2,31,279
;340/220,222,237S |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Frazier; Roy D.
Assistant Examiner: Aschenbrenner; Peter A.
Parent Case Text
RELATED APPLICATION
This application is a continuation-in-part of applicants' copending
application Ser. No. 216,202, filed Jan. 7, 1972, now U.S. Pat. No.
3,777,423 for Condition Responsive Door Holder-Closer.
Claims
What is claimed is:
1. A condition responsive electromechanical closure holder-closer
for use with a closure adapted for relative movement with respect
to a closure frame, comprising a housing containing the closure
holder-closer and adapted to be surface mounted adjacent and above
the closure, a spring located within the housing for exerting a
closing force on the closure, a damper located within the housing
and coupled to the spring for controlling the spring exerted
closing force applied to the closure, an electromagnetic arresting
means located within the housing with when energized arrests the
spring-damper subcombination from closing an otherwise open closure
relative the frame and which when deenergized enables the
spring-damper subcombination to close the closure relative the
frame, an arm assembly adapted to couple the closure to the closure
holdercloser to provide closure control responsive to the energized
or deenergized condition of the electromagnetic latch, a
photoelectric condition-responsive detector contained within the
housing and connected to the electromagnetic arresting means to
control the energized or deenergized condition thereof, and means
including passageways formed in said housing by which said
internally housed detector is subjected to a fluid flow
characteristic of the presence of said condition to deenergize an
otherwise energized electromagnetic arresting means to thereby
enable the holder-closer to release and close an otherwise open
closure.
2. A condition responsive door holder-closer comprising a housing,
a closer spring and a dashpot disposed within the housing, a drive
spindle projecting through the housing and coupled to the
spring-dashpot subcombination to be responsive to the damped forces
exerted by the subcombination, means within the housing for
arresting the spindle at a door holdopen position, means including
one or more openings in said housing for defining passageways
within said housing to facilitate fluid flow within the housing
including the particulate products of combustion, a photocell
detector for the particulate products of combustion located within
the housing, and means interconnecting the detector to the spindle
arresting means to release the spindle in response to the flow of
the particulate products of combustion through said housing
passageway means.
3. The combination of claim 2 in which the housing is generally
horizontally disposed on a door frame immediately over the door,
and an arm couples the spindle to the door so that the door and
spindle are responsive motionwise to one another.
4. The combination of claim 3 in which the door is pivoted for
movement relative the frame, the spindle being located adjacent the
pivot axis for the door and generally at one end of the housing,
and the passageway defining means being generally located at the
opposite end of the housing remote from the pivot axis.
5. The combination of claim 4 in which the door holder-closer
housing is elongated and generally horizontally disposed on the
surface of the frame.
6. The combination of claim 5 in which the passageway defined
through the housing is generally vertical.
7. The combination of claim 6 in which the passageway ddefined
through the housing is both vertical and horizontal attained by
openings located on the top, front, and bottom of the housing.
8. A condition responsive door holder-closer contained within a
housing, comprising a photocell condition detector located within
the housing and responsive to fluid flow carrying the particulate
products of combustion, means including one or more openings in
said housing defining a fluid flow passageway within said housing
to said condition responsive detector, a closer-holder
spring-dashpot combination including electrically operated means
for arresting the spring-dashpot combination to a door hold-open
position with the spring, dashpot and electrically operated means
being disposed within the housing, and means interconnecting the
condition responsive detector to the electrically operated
arresting means whereby the passage of the particulate products of
combustion through an opening into the passageway releases an
arrested spring-dashpot combination.
9. The combination of claim 8 in which the one or more openings is
located generally at one end of the housing, and means located
generally at the other end of the housing and projecting
therethrough for coupling to a door to effect hold-open and also
door release.
10. The combination of claim 9 in which a door opening is defined
by a frame having a header portion at the top of the frame, and in
which the housing is supported at the top of the frame with the one
or more housing openings being generally located toward the
mid-portion of the header and the door coupling means being located
generally at an end portion of the header.
11. The combination of claim 8 in which a plurality of housing
openings defines a complete fluid flow passageway into and out of
the housing.
12. The combination of claim 10 in which a plurality of housing
openings defines a complete fluid flow passageway into and out of
the housing.
13. A condition responsive door holder-closer to control a door
pivotally mounted relative an opening defined by a frame having a
header portion at the top of the frame, comprising a housing
supported above the door on or near the header portion, a closer
spring and a dashpot disposed within the housing, a drive spindle
projecting through the housing and coupled to the spring-dashpot
combination to be responsively rotatable by the damped forces
exerted by the combination, the spindle being located adjacent the
pivot axis of the door and generally near an end of the housing
mounted adjacent an end of the header portion, an arm coupling the
projected end of the spindle to the door to also responsively
rotate the spindle by forces exerted on the door, a photocell
detector for the particulate products of combustion located
generally at the opposite end of the housing toward the midportion
of the door opening, electrically operated means located within the
housing for arresting the spring-dashpot combination to a door
hold-open position, and means interconnecting the condition
responsive detector to the electrically operated arresting means
whereby the passage of products of combustion through the door
opening releases an arrested springdashpot combination to close an
open door.
14. The combination of claim 13 in which the housing is elongated
and is disposed generally horizontally on its elongated axis.
15. In a condition responsive door holder contained within a
housing and adapted to be mounted immediately over a door opening,
the holder including electrically operated means within the housing
for effecting a door hold-open condition, the improvement
comprising a particulate products of combustion photocell detector
located within the housing and responsive to particulate products
of combustion and in which detector an electrical current
characteristic is altered in response to detection of such
particulate products of combustion, means including one or more
openings in said housing defining a fluid flow passageway within
said housing to said detector, and means interconnecting the
detector to the electrically operated means whereby the passage of
the particulate products of combustion through the passageway
actuates the door holder from a hold-open condition whereby the
door is no longer positively held open by the door holder.
Description
BACKGROUND OF THE INVENTION
The prior art is prolific in door holder-closer structures
responsive to the products of combustion to effect an alarm or
emergency release of open doors. Where such doors are released by
detectors, several approaches have been employed, generally ranging
from door release by a complex central fire alarm system
characterized by detectors spaced throughout a structure under
surveillance to a simple form of a fusible element mounted on the
arm of a door closer.
The most common type of quick response detector employed has been a
photocell (refraction type) detector or an ionization detector
mounted on the ceiling of a corridor, approximately five feet from
a fire resistant door to effect a barrier which will prevent
passage of the products of combustion from one section of a
building to another. As a general rule, if the top of the door, or
lintel, extends below the corridor ceiling over eighteen inches, it
is standard practice to install a second detector on the opposite
side of the door, again approximately five feet from the door. The
corridor closure may be a single door or a dual door using an
electromagnetic door holder-closer on each door. In any event, each
detector is located remotely from the controlled holder-closer.
Accordingly, at least two units must be separately mounted with
interconnecting wiring.
In the event products of combustion are generated, a detector
located on the ceiling causes the release of all controlled doors
to close the corridors. At this stage, personnel evacuation of a
building is possible since the doors will open in the direction of
egress from the building. However, in many cases premature and
unsafe door closing is effected because the detection of ceiling
smoke will occur well before the exitways through the doors become
smoke laden. Accordingly, the doors must be manually reopened to
permit evacuation of those persons who may have delayed their
exit.
Examples of prior art patents relating to condition detectors and
also detector responsive doors are as follows:
US PATENT FILED INVENTOR TITLE
__________________________________________________________________________
1,392,002 6-21-19 Engle Thermo Control for Fire Doors 2,665,129
1-5-54 Durbin et al Thermoelectric Door Operating Mechanism
3,009,138 11-14-61 Lindsay Radioactive Burglar Alarm System
3,039,764 6-19-62 Heinsman et al Electric Door Operator 3,069,997
12-25-62 Julian Apparatus for Preventing Ex- filtration of
Smoke-Laden Air from Smokehouse Enclosures 3,207,273 9-21-65 Jurin
Closure Release Device 3,382,762 5-14-68 Vasel et al Smoke
Detecting Device 3,430,220 2-25-69 Deuth Fire Detector 3,445,669
5-20-69 Jordan et al Radiation Sensitive Carbon Monoxide Detector
3,447,152 5-27-69 Jensen Fire and Smoke Alarm Device 3,495,353
2-17-170 Forsberg Door Operating Mechanism 3,496,381 2-17-70 Wisnia
Proximity Control Guard Plate 3,497,995 3-3-70 Forsberg Height
Sensitive Proximity Door Operator System 3,500,368 3-10-70 Nagoa
Abe Automatic Ionic Fire Alarm System 3,534,499 10-20-70 Chaffee
Door Opening Apparatus
__________________________________________________________________________
SUMMARY OF THE INVENTION
The invention herein described incorporates a photocell particle
detector module in the holder-closer housing. The housing is
preferably located above the door on the lintel or header of the
door frame. Any products of combustion pass through multiple
passageways located within the holder-closer housing to actuate the
detector. Location of the detector at this point and within the
holder-closer housing effects a major safety advantage. Instead of
each controlled door closing at the first evidence of smoke at the
ceiling (and the ceiling may be from seven to fourteen feet high),
each door will now remain open until the smoke "level" builds
downwardly from the ceiling to the height of the door -- leaving
the doors open for persons to move in either direction -- until
such time as smoke or products of combustion begin to block the
actual exitway.
It is impossible to predict the logic of most persons under a fire
or panic condition. Faced with closed doors, many persons will
panic even though the doors will manually open with a normal force.
Moreover, early door closing is highly disadvantageous for those
buildings within which non-ambulatory patients are housed.
The location of the detector near the center of the door or, in the
case of a double door closure, near the center of the corridor, is
simply the best location to detect smoke or products of combustion.
This detector location is effectively attained by this invention
because the end of the closer-holder housing containing the
detector is generally so located. There is a natural flow of air or
draft through a closure opening. This flow will carry the products
of combustion through this opening and also effectively through the
detector fluid flow passageways formed into the surface mounted
holder-closer of this invention. The detector, however, is not
actuated until the exitway is subject to smoke passage; thus,
facilitating evacuation until the last possible safe moment.
Additionally, the present invention has the economic advantage that
regardless of the height of the corridor ceiling relative to the
height of the door, one detector is all that is required to
properly monitor the door. The interconnection of separated
detectors and controlled holder-closers is eliminated.
DETAILED DESCRIPTION OF THE DRAWINGS
In order that all of the structural features for attaining the
objects of this invention may be readily understood, reference is
herein made to the drawings, wherein:
FIG. 1 is a view showing the surface application of the condition
responsive door holder-closer of this invention to a single
door;
FIG. 2 is a view showing the application of one door holder-closer
of this invention to control a pair of corridor doors;
FIG. 3 is an exploded view showing certain principal components of
the door holder-closer, namely, the photocell particle detector
module, the holder-closer assembly, and the cover;
FIG. 4 is an exploded fragmentary view showing the top-bottom
access openings for the products of combustion in the cover, the
photocell particle detector module, and the holdercloser frame;
FIG. 5 is a section view taken along line 5--5 of FIG. 4 showing
the relative alignment of the front-top-bottom openings of the
cover, frame and module which provide fluid flow access to the
photocell dark chamber;
FIG. 6 is a top view with certain components being broken away to
show the top and bottom circularly disposed access openings;
FIG. 7 is a partial front view of that portion of the cover having
the combustion products access openings;
FIG. 8 is a perspective view of the particle detector with a
portion of the chamber wall being broken away to expose the
internal disposition of the components within the chamber;
FIG. 9 is a bottom fragmentary view of the portion of the door
holder-closer containing the photocell particle detector module
with certain components being broken away to expose elements of the
module chamber and also to show the relative disposition of the
module relative the closer spring;
FIG. 10 is a top fragmentary view of the door holder-closer
assembly, showing in full or in section the principal components of
the holder-closer, namely, the closer spring, dashpot,
electromagnet and the latching lever assembly;
FIG. 11 is a front view of the structure of FIG. 10 with the
dashpot partially in section (see lines 11--11 of FIG. 10) to show
the details of the dashpot and the dashpot rollers;
FIG. 12 is a fragmentary view of the door holder-closer showing the
latching lever assembly being manually overridden from a hold-open
position and with the electromagnet energized;
FIG. 13 is a fragmentary view of the door holder-closer showing the
latching lever assembly being released in response to the
deenergization of the electromagnet;
FIG. 14 is a rear view showing the latching lever assembly coupled
to the holder-closer dashpot by a fulcrum pin;
FIG. 15 is a section view of the latching lever assembly taken
along line 15--15 of FIG. 14;
FIG. 16 is a schematic circuit, with the principal components of
the door holder-closer being diagrammatically shown, which shows
the failsafe connection of the photocell particle detector module
to its associated circuitry;
FIG. 17 is a view showing the surface application of a second
embodiment of the condition responsive door holder-closer of this
invention to a door;
FIG. 18 is a view similar to that of FIG. 9 showing, however, a
second form of photocell particle detector;
FIG. 19 is a section view taken along line 19--19 of FIG. 18;
FIG. 20 is a detailed view showing the two source light paths taken
in the photocell particle detector of FIGS. 18 and 19; and
FIG. 21 is a schematic circuit showing the connection of the
particle detector of the second embodiment to the schematic
circuitry of FIG. 16.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now to FIG. 1, the condition responsive electromechanical
door holder-closer 1 of this invention is shown typically applied
to a flush door 2 which is supported by a plurality of butt hinges
3 (only one of which is shown) upon a conventional metal door frame
4.
In general, door holder-closer 1 includes a track 5 within which a
slide block (not shown) reciprocates. The left end of standard arm
6 is coupled to the slide block. The right end of arm 6 is coupled
to the projecting end of a rotating drive spindle (114 of FIG. 11)
which is an integral part of the holder-closer dashpot.
The door holder-closer housing includes a cover 7 which contains
the principal components of this invention, namely, a photocell
particle detector module, a coil spring, a link chain, a dashpot
and an electromagnetic lever assembly.
In the usual preferred installation of door holder-closer 1, cover
7 and its contained components are fixedly positioned on the header
trim 8 of door frame 4, and track 5 is fixedly positioned
immediately below cover 7 adjacent the upper edge of flush door 2
as is shown in FIG. 1.
As is shown in FIGS. 1, 3, 4 and 5, cover 7 has a planar bottom
wall 9, a planar front wall 10 with curved ends, and a planar top
wall 11.
Bottom wall 9 is formed with a plurality of circularly disposed
openings 12, front wall 10 is formed with two rows of rectangular
openings 13, and top wall 11 (FIG. 6) is formed with a plurality of
circularly disposed openings 14. As is hereafter outlined in
detail, openings 12, 13 and 14 located in cover 7 are so aligned
with other openings to provide fluid flow access for the products
of combustion to a photocell particle detector which is part of the
detector module located within the housing.
FIG. 2 shows the application of one condition responsive door
holder-closer 1 of this invention to control a pair of corridor
doors 2 and 2'. Each door 2, 2' is controlled by a closer 1, 1',
respectively.
It should be noted, however, that only door 2 is controlled by a
holder-closer 1 which includes a cover 7 formed with a plurality of
openings such as shown with respect to cover 7 of FIG. 1.
Holder-closer 1' which controls door 2' is contained within a cover
7' which has no openings that correspond to openings 12, 13 and 14
of cover 7. In general, holder-closer 1' is constructed in a manner
identical to that of condition responsive holder-closer 1 with the
exception that no particle detector module is included within the
closer 1'. As will be hereinafter outlined, the electrical
circuitry of closers 1 and 1' are interconnected so that if
holder-closer 1 detects products of combustion, both closers are
activated simultaneously so as to close doors 2, 2' in response to
such detection. It has been found that it is unnecessary in the
application of a pair of doors which close off a hall or corridor
to employ individual detectors within each of closers 1 and 1'
inasmuch as the single detector is capable of adequate response to
close off both doors.
FIG. 3 is an exploded view showing the two principal components of
the door holder-closer 1, namely, the particle detector module 15
and the door holder-closer assembly 16. Module 15 is insertable
within assembly 16 by module movement in the direction of the
arrow, and the combined module holder-closer assembly is enclosed
by cover 7 by relative movement of combined components 15 and 16 in
the direction of the arrows toward cover 7.
Door holder-closer assembly 16 includes a metallic frame 17 which
is generally U-shaped in cross section, having an elongated
irregular bottom 18, a connecting back 19, and an elongated
irregular top 20. As is shown in FIGS. 3, 4, 5 and 6, frame bottom
18 and frame top 20 are formed with circular openings 21 and 22,
respectively. The plurality of cover bottom openings 12 are aligned
with frame opening 21 as is shown in FIGS. 3, 4 and 5, so that
opening 21 provides bottom access for openings 12 into the interior
of frame 17. Similarly, the plurality of cover top openings 14 are
aligned with frame opening 22 so that top access may be had into
the interior of frame 17 (FIGS. 5 and 6).
In view of the fact that frame 17 has no front covering adjacent
frame openings 21 and 22, cover openings 13 permit direct fluid
flow access into frame 17 (see FIGS. 3, 5 and 7).
As is shown in FIGS. 3 and 4, particle detector module 15 is an
integral electrical unit having a body portion 15a from which a
finger portion 15b projects. As is shown in FIGS. 3 and 9, frame 17
is formed with a chamber which will receive module 15. Module 15
comprises a supporting frame having two metallic sides 23 and 24
(FIGS. 3, 5 and 9) joined by a metallic bottom 25. Metallic sides
23 and 24 are fixed in the parallel disposition by means of
metallic spacer posts 26 and 27 (FIG. 9).
Electrical components and interconnecting wiring generally
denominated by numeral 28 are mounted upon circuit board 29. These
components constitute part of the particle detector amplifier
hereinafter described. Circuit board 29 is electrically isolated
from module bottom 25 by insulating sheet 30.
Referring to FIGS. 5, 8, 9 and 16, a photocell particle detector 31
comprises generally a housing having a light source 33 disposed
outside the housing, and a photocell detector element 34 also
disposed outside the housing.
Detector 31 is particularly adapted for use as the detector unit of
a smoke alarm and for this purpose the housing comprises a
peripheral wall or main body portion 35 and a pair of end caps 37
and 38 defining an internal chamber 36. The end caps extend beyond
the periphery of wall 35 and have inwardly turned flanges 39 and 40
which are spaced outwardly from the wall. Each end of wall 35 is
provided with a series of outwardly inclined spacing lugs 41, which
are adapted to engage frictionally the inner surface of the flanges
to retain the caps in assembly. The flanges 39 and 40, in
conjunction with the spacing lugs 41, form a peripheral passageway
having sets of apertures 49 opening the chamber 36 at each end of
the wall to permit smoke to enter the chamber from the surrounding
atmosphere. Circular screen segments 50 and 51 cover each of the
apertures to prevent particulate matter of a non-combustion variety
from entering the chamber.
A focusing tube 42 extends through housing wall 35, and a light
trap tube 43 is disposed in the housing wall on the opposite side
in alignment with the focusing tube 42. These elements direct and
control the light beam from source 33. A lens 44 of the converging
type is disposed within focusing tube 32, with a focal length such
that light from the source 33 is focused in a converging beam onto
the bottom of the light trap tube 43, so that the beam from the
light has a minimum size at the bottom of said trap, and
substantially none of the light from the source falls on any other
portion of the interior surface of the housing.
A detector tube 45 extends through the housing wall between the
light trap tube and the focusing tube, and is disposed generally
perpendicular to the axes thereof. A photocell detector element 34
is disposed in the detector tube, and to restrict the field of view
of the detector, a lens 46 of the converging type is disposed in
the detector tube between the detector element and the chamber.
Lens 46 has a focal length such that the image of the detector
element is focused onto a minimum area on the opposite surface of
the housing wall. The cone of focus of the detector element is
directed across the cone of focus of the light beam, so that the
detector element views only the medial portion of the light beam
and the field of view of the cell at the opposite wall portion is
confined to the medial portion of the wall. The photocell does not
view the peripheral apertures at the top and bottom of the wall.
Hence substantially no light reaches the detector element except
light appearing in the focus cone of the lens 46. To further insure
that a minimum amount of the internal stray light reaches the
detector element, the end 47 of the detector tube on the side
adjacent the light tube extends forwardly to the cone of focus of
the light beam to provide a shield against stray light from the
inside surface of the focus tube. The end of the detector tube from
this foremost point is inclined rearwardly at an angle such that
the inside surface of the detector tube cannot view the inside
surface of the focus tube. To prevent stray reflected light from
the inside of the light trap tube from reaching the detector lens
46, the side of the end of the detector tube adjacent the light
trap tube is provided with an inclined shield 48.
The detector element 34 may be any type of device which is
responsive to a change in light intensity, such as a photoelectric
or a photo-resistive cell. One type of cell which has been found
satisfactory is cadmium sulfide, which responds to an increase in
light intensity by a decrease in resistance. Hence in the
illustrated embodiment a detector circuit hereafter described may
be connected to the detector element and adjusted under normal
conditions of no smoke so that a predetermined further decrease in
cell resistance will actuate an external alarm connected to the
detector circuit. When smoke enters the housing and appears in the
light beam, light from the smoke particles in the portion of the
light beam viewed by the detector is reflected or diffused onto the
detector cell, thereby lowering the resistance of the cell and
actuating the alarm circuit.
U.S. Pat. No. 3,382,762 issued May 14, 1968 describes further
details of the photocell particle detector.
As is shown in FIGS. 5 and 9, particle detector 31 is supported
within module 15 by a plurality of support brackets 53. The
detector is also tightly sandwiched between module sides 23 and 24
by a pair of spaced insulating discs 54 and 55 (FIG. 5). Module
wall 23 is formed with a plurality of circularly disposed openings
56 (FIG. 4) to permit fluid flow access to the adjacent chamber
apertures 49. Similarly, module wall 24 is formed with a plurality
of circularly disposed openings 57 (FIG. 5) to permit access to the
adjacent chamber apertures 49. Accordingly, fluid flow access into
interior chamber 36 is provided by the following three
passageways:
1. front passageway -- through cover openings 13 to the adjacent
chamber apertures 49 (FIGS. 3, 5, 7 and 8);
2. bottom passageway -- through cover openings 12, frame opening
21, circularly disposed module wall openings 56 to the adjacent
chamber apertures 49 (FIGS. 3, 4 and 5); and
3. top passageway -- through cover openings 14, frame opening 22,
circularly disposed module wall openings 57 to the adjacent chamber
apertures 49 (FIGS. 5 and 6).
As is hereinafter outlined with reference to the
schematic-diagrammatic representation of FIG. 16, fluid flow, i.e.
the passing of the particulate products of combustion through the
foregoing passageways affects the electrical resistivity or other
characteristics of photocell 34 so that appropriate amplifier
circuitry can detect such products.
The principal components of door holder-closer 1 which cooperate
with particle detector module 15 will now be described. Referring
to FIGS. 10 and 11, support frame 17, which is enclosed within
cover 7, houses the following principal components; namely, spring
coil assembly 79, link chain 80, dashpot 81, electromagnet 82 and
latching lever assembly 83.
Latching lever assembly 83 is described in U.S. Pat. No. 3,729,771,
issued May 1, 1973 to Burke J. Crane et al for Latching Lever
Assembly for Door Holder-Closer.
Spring assembly 79 includes compression coil spring 84 which
envelops a spring rod 85. The left end of spring rod 85 is threaded
(FIGS. 9 and 10) so that the adjacent end of spring 84 is held by
spring retainer 86. Retainer 86 is adjustably mounted relative
threaded rod 85 by washer 87 and spring tension adjusting nut
88.
The right end of spring 84 is supported on spring support plate 89
which has a retaining circular flange 90. Flange 90 receives the
adjacent contacting spring 84 turn. Accordingly, spring 84 is
positioned relative to rod 85 by spring retainer 86 and spring
support plate 89 so that adjustment of nut 88 can vary the static
compression force generated by spring 84.
Lateral movements of spring 84 relative to frame 17 are limited by
front spring guide 91 and rear spring guide 92.
The right end of spring rod 85 (FIGS. 10 and 11) is coupled to link
chain 80 by connecting pin 93. The right end of link chain 80 is
coupled to dashpot 81 by connecting pin 94.
The details of the dashpot, particularly with reference to FIGS. 10
and 11, will now be described. In FIG. 10, a simplified horizontal
section view of the dashpot is shown and in FIG. 11 a simplified
vertical section view taken along lines 11--11 of FIG. 10 is
shown.
In its principal aspects, dashpot 81 comprises a fixed stator 95
which is housed within cavity 96 defined by generally cylindrical
rotor 97. Stator 95 is formed with a pair of stator vanes 98 and
99. The stator and its vanes remain fixed at all times relative
support frame 17. Stator 95 is formed with a mounting flange 100
(FIG. 11) which is fixed to frame top 20 by a plurality of screws
101.
Rotor 97 supports a pair of integral vanes 102 and 103 (FIG. 10)
which rotate with the rotor. As is shown in FIG. 11, rotor 97
comprises a cylindrical section 104 to which annular flanges 105
and 106 are fixedly attached. The rotation of rotor 97 produces a
corresponding rotation of annular flanges 105 and 106.
Connecting pin 94 extends between flanges 105 and 106 to anchor
chain 80 responsively to rotor 97. Likewise, roller pins 107 and
108 extend between the flanges so that rollers 109 and 110 may
rotate relative their associated pins and between the flanges.
Rollers 109, 110 also move responsively with rotor 97 and flanges
105, 106.
The interior dashpot cavity 96 defined between rotor 97 and stator
95 contains a viscoelastic plastic solid. This material may
preferably be either a natural or synthetic unvulcanized rubber or
an elastomeric-like material known as "bouncing putty". This
damping medium is contained with cavity 96 by means of O-ring seal
111; damping adjusting screw 112 is manually movable within its
threaded bore to exert a varying pressure upon the damping medium
through port 113 (FIG. 11). Rotor spindle stem 114 receives the
lower end of rotor cylindrical section 104 so that elements 104,
114 rotate in unison. Consequently, the attachment of standard arm
6 to spindle stem 114 produces related movement between arm 6 and
the dashpot rotor elements. Rotor elements 104, 114, including
flanges 105 and 106 are rotatably fixed relative frame 17 by
bearing plates 115 and 116.
Stepped pin 117 serves as an alignment bearing for rotor 97
relative stator 95.
As is shown in FIG. 10, electromagnet 82 and lever assembly 83 are
closely associated with dashpot 81. In particular, electromagnet 82
is supported on frame 17 by electromagnet support plate 117.
Referring now principally to FIGS. 10, 11, 13, 14 and 15, the
latching lever assembly 83 will now be described. The principal
elements of lever assembly 83 are lever 120, lever fulcrum shaft
121, lever assembly biasing spring 122, armature-lever coupling
spring 123, armature plate 124, screw-washer-nut 125, and spring
alignment cylinder 126.
Lever 120 is formed with a latch detent 127 whose main function is
to engage rollers 109 and 110 to effect hold open. The lever is
also formed with a yoke having legs 128 and 129 from which lugs 131
and 132 project to receive coupling spring 123.
Coupling spring 123 (FIG. 14) is a helical wound torsion spring
formed into two divided and joined sections 133 and 134 having a
central spring connector loop 135 (FIG. 15) and two end connector
loops 136 and 137 (FIG. 14).
Spring 123 is shown in its tensioned position; that is, end
connector loops 136 and 137 have been relatively rotated under
spring tension so that loops 136 and 137 are adjacent central
connector loop 135 as is shown in FIG. 15. This disposition of
connector loops 135, 136 and 137 places spring sections 133 and 134
in torsional tension. Accordingly, when loop 135 is rigidly fixed
to armature 124 by bolt and nut 125 (FIG. 15) and end connector
loop 136 is fixed to lug 131 and end connector loop 137 is fixed to
lug 132 (FIG. 14), coupling spring 123 develops a strong torsional
force which tends to force armature plate 124 against lever 120 as
is shown in FIGS. 10, 13 and 15. However, it should be noted that
as shown in FIG. 13, the resiliency of spring 123 enables armature
plate 124 to be separated from lever 120 in response to oppositely
directed forces as will be hereafter outlined.
When door 2 is closed, as is shown in FIG. 1, and regardless of the
energized or deenergized condition of electromagnet 82, lever
assembly 83 assumes the position shown in FIG. 10. As is shown in
this Figure and also FIG. 14, lever 120 is pivoted relative dashpot
81 by fulcrum pin 121. Fulcrum pin 121 also receives biasing spring
122 so that a force is exerted by this spring which normally urges
the lever assembly to the position shown in FIG. 10; that is, a
position in which armature 124 rests against electromagnet 82.
When electromagnet 82 is energized, armature 124 is magnetically
attracted to the core of the electromagnet. However, as door 2 is
opened, rotor 97 (FIGS. 12 and 13) is rotated counterclockwise
moving therewith chain 80 and thus compressing closer spring 84.
The counterclockwise motion of the rotor also causes rollers 110
and 109, in that sequence, to pass under latching detent 127, thus
elevating lever 120 as is shown in FIG. 12. Armature 124, however,
is magnetically fixed against electromagnet 82 in response to the
energization of this electromagnet.
As the rotor 97 is rotated counterclockwise a further slight angle
from that shown in FIG. 12, roller 109 (or roller 110 depending
upon the amount of angular hold-open desired) is held in engagement
against latching surface 127a of latching detent 127. With this
occurrence, lever 120 is lowered so that it assumes the relative
position with respect to armature 124 shown in FIG. 10. Door 2 is
thus held open by the engagement of either roller 109, 110 and
latching surface 127a.
In the event it is decided to manually override the hold-open latch
of door holder-closer 1, the clockwise movement of rotor 97 causes
rollers 109, 110 to elevate or cam away lever 120 so that the
closer spring 84 can rotate rotor 97, thereby causing standard arm
6 to move within track 5 to close door 2.
It is important to note that during this condition of manual
override, armature 124 is retained against electromagnet 82 as is
shown in FIG. 12. In other words, during manual override, armature
124 always maintains contact with electromagnet 82. The resiliency
of coupling spring 123 enables lever 120 to move upwardly without a
corresponding movement in armature 124.
In the event door 2 is held open in response to the engagement of
either roller 109, 110 with respect to latching surface 127a, and
electromagnet 82 is deenergized due to the opening of a manual
operate switch or the detection of an undesired condition by
particle detector 31, lever assembly 83 is released as is shown in
FIG. 13 and rollers 109, 110 cam latching detent 127 upwardly. In
view of the fact that electromagnet 82 is deenergized, a holding
force is not applied to armature 124 and the armature maintains its
contact position with respect to lever 120 as a result of the
torsional forces applied to armature 124 and lever 120 by coupling
spring 123.
In all situations in which electromagnet 82 is deenergized, lever
latching assembly 83 produces a characteristic release noise which
is undesirable. However, in the usual installation of a
holder-closer of the type described, an emergency or alarm release
rarely occurs; accordingly, such noise can be tolerated. Manual
override, however, is a commonplace occurrence, and in this
instance latching lever release noises can attain an intolerable
frequency unless eliminated by appropriate latching lever
designs.
The schematic circuit of FIG. 16 shows an electrical circuit
effecting the interconnection of electromagnet 82 to particle
detector 31 to effect hold-open and closing of door 2 in a failsafe
manner of operation. Additionally, the schematic circuitry
incorporates a condition responsive detector and amplifier unit
within module 15 which is failsafe in operation. In particular, if
all of the components of the module 15 are properly operating, door
2 will remain in hold-open effected by the latching of either
roller 109 or 110 against latching detent 127 in response to the
manual closing of control switch 151. If, however, module 15 is not
properly operating or, alternatively, this unit senses a condition
such as flame or smoke, door 2 will be released from a latched
hold-open position effected either by roller 109 or 110 and closed
in response to the closing force exerted by coil spring 84.
The detailed operation of the circuitry of FIG. 16 is as follows.
Assuming module 15 is in proper operating condition and that the
particle detector 31 input applied to terminals 152 and 153
indicates an absence of a flame or smoke condition, door 2 will be
held in the open position in response to the manual closing of
switch 151; that is, the closing of switch 151 applies line voltage
from terminals 154 and 155 to amplifier A of module 15. The
application of line voltage to amplifier A energizes amplifier
output relay 156, thereby closing normally open contact 156a.
The closing of contact 156a applies line voltage to the coil of
power relay 157. With this occurrence, normally open contact 157a
is closed, thereby applying line voltage to fullwave bridge
rectifier 158 to energize electromagnet 82 with a
pulsating-direct-current voltage. (The physical position of a
module containing bridge 158 is shown in FIGS. 10-13).
The energization of electromagnet 82 causes magnetic armature 124
to resiliently hold lever 120 downwardly (FIG. 10) and into locking
engagement with either roller 109 or roller 110 against latching
detent 127 (if door is manually opened).
Accordingly, lever 120 holds rotor 97 with sufficient force to
overcome the otherwise closing force exerted by coil spring 84.
Thus, so long as the electromagnet 82 is energized, door 2 will be
held in an open position.
In the event, however, (a) a slight manual closing force is applied
to door 2, (b) switch 151 is opened, (c) module 15 malfunctions, or
(d) an undesired condition such as smoke or flame is detected by
detector 31, lever detent 127 will be pivoted from engagement with
roller 109 or 110, as the case may be, and spring 84 will close the
door to the position shown in FIG. 1.
In the situation of case (a) above, the manual override closing
force causes disposition of the lever assembly 83 components as
shown in FIG. 12 during the point of operation at which roller 109,
for example, is in camming engagement with latching detent 127.
In situations (b), (c) and (d) above, electromagnet 82 is
deenergized, thereby enabling the camming action of roller 109 or
110, as the case may be (see FIG. 13), to elevate lever 120 as well
as armature 124 as is shown in this Figure.
In a multiple door installation, such as the corridor application
shown in FIG. 2 in which only holder-closer 1 need incorporate a
detector module 15, the electromagnet of holder-closer 1' is merely
interconnected with the circuitry for holder-closer 1 so that both
electromagnets (corresponding to electromagnet 82) are energized or
deenergized simultaneously.
Reset pushbutton switch 62 is connected to amplifier A of module 15
so that the circuitry can be again placed in a detecting readiness
condition after the closer has released in response to a fire or
alarm condition. Switch 62 is accessible for manual operation from
the front of cover 7 (FIGS. 7 and 9).
Pilot light 63 is also connected to amplifier A of module 15. When
the circuitry is in a properly operating supervisory condition, the
pilot light will periodically emit light. When a fire, etc. is
detected, the pilot light will remain on. A deenergized pilot light
indicates an electrical malfunction. In a preferred circuit
arrangement the circuitry "locks" into an alarm condition (pilot
light 63 on) and remains in an alarm condition until the unit is
reset by manual operation of switch 62.
FIGS. 17 through 21 show a second embodiment of the invention which
in general is characterized by the use of a second form of
photocell particle detector 64. Particle detector 31, employed in
the first embodiment, is characterized by a detector element 34
which is operated by light diffusion or reflection in response to
the entry of products of combustion into internal chamber 36. The
particle detector 64 of the second embodiment is characterized by
light absorption or attenuation of light traveling from a light
source to a photocell detecting element.
Referring to FIGS. 17 and 19, the front of cover 7 is formed with
two elongated slots 65, the bottom is formed with a single
elongated slot 66, and the top is formed with an identical
elongated slot 67. The particular form and disposition of slots 65,
66 and 67 enable efficient passage of the particulate products of
combustion into the interior of the door holder-closer 1. More
particularly, these products must pass into elongated detector tube
68 so that light emanating from source 33 (FIGS. 18, 20 and 21) may
be absorbed or attenuated in its path of travel to photocell 69.
Detector tube 68 is formed by a plurality of spaced support plates
70 which extend from the front to the rear of tube 68. The
peripheral edges of support plate 70 carry blackened wire screen 71
whose interstices permit the passage of smoke into the interior
chamber of detector tube 68. Each of the plates 70 is formed with a
central hole 72. Accordingly, light emanating from source lamp 33
travels through light conduit elbow 73 (FIG. 20) in a path of
travel in which the light is reflected from mirror surface 74
through lens 75 through the plurality of axially aligned holes 72
to impinge upon photocell 69.
Light from source 33 also travels through a second path which
includes second light conduit elbow 76. Light traveling in this
conduit elbow is reflected by mirror 76 and follows a path through
lens 77 into closed standard tube 78 to thus impinge upon photocell
160. The interior chamber formed by standard tube 78 is
hermetically sealed and, accordingly, any products of combustion
cannot enter this tube and, therefore, no light absorption occurs
within this tube during smoke entry into the inner confines of
closer 1.
Referring now to FIG. 21, photocells 69 and 160 are connected in a
bridge circuit with variable resistors 161 and 162. Output
terminals 152 and 153 of the bridge circuit correspond to like
numbered terminals shown in the schematic circuit of FIG. 16.
Likewise, terminals 60 and 61 connected to lamp 33 correspond to
the like numbered terminals also shown in FIG. 16. The only circuit
change is the substitution of the particle detector 64 for particle
detector 31. By making appropriate connections to terminals 60 and
61, 152 and 153, circuit operation is obtained which is
substantially identical to that previously described with respect
to FIG. 16. Variable resistors 161 and 162 are normally adjusted so
that with ambient condition no signal appears at the output of
amplifier A. However, in the event smoke enters detector tube 68
through wire screen 71, the bridge becomes unbalanced and a signal
change appears at terminals 152 and 153. This signal change is
applied to amplifier circuit A in accordance with the operation
previously described with reference to FIG. 16, thus causing door
holder-closer 1 to close door 2.
It should be understood that the above described embodiments are
merely illustrative and that changes can be made without departing
from the scope of the invention.
* * * * *