U.S. patent number 3,676,570 [Application Number 05/168,853] was granted by the patent office on 1972-07-11 for mounting for fire detector devices.
This patent grant is currently assigned to Fire Devices, Inc.. Invention is credited to William J. Gabb.
United States Patent |
3,676,570 |
Gabb |
July 11, 1972 |
MOUNTING FOR FIRE DETECTOR DEVICES
Abstract
A mounting for fire detector devices is provided which comprises
an adapter place of circular disc like shape with a plurality of
spaced mounting holes and a rim extending from one face for flush
mounting with said one face upwardly or on a junction box with said
one face downwardly and for the attachment thereto of the fire
detector device.
Inventors: |
Gabb; William J. (Old Lyme,
CT) |
Assignee: |
Fire Devices, Inc. (Ivoryton,
CT)
|
Family
ID: |
22613205 |
Appl.
No.: |
05/168,853 |
Filed: |
August 4, 1971 |
Current U.S.
Class: |
174/61;
248/343 |
Current CPC
Class: |
H02G
3/18 (20130101) |
Current International
Class: |
H02G
3/18 (20060101); H02g 003/20 () |
Field of
Search: |
;174/48,49,52,61,62,63,64 ;240/78CF,85R ;248/343,342 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Myers; Lewis H.
Assistant Examiner: Tone; D. A.
Claims
I claim:
1. A mounting plate for the mounting of a fire detector device on a
ceiling or the like which comprises
a disc shaped plate having a central opening,
a rim on one side face of said plate at the outer edge thereof,
said plate having diametrically spaced fastener receiving mounting
openings for mounting of said plate in position for use, and
said plate having diametrically spaced bolt receiving mounting
openings for mounting a detector device on either side face of said
plate,
said last mentioned openings having a central enlargement for the
insertion of the head of a mounting bolt.
2. A mounting plate as defined in claim 1 in which
said plate on the side face on which said rim is disposed has a
plurality of radially extending stiffening ribs.
3. A mounting plate as defined in claim 1 in which
said fastener receiving openings have countersunk portions on the
other side face.
4. A mounting plate as defined in claim 2 in which
said fastener receiving openings extend through said ribs.
5. A mounting plate as defined in claim 1 in which said fastener
receiving openings are of key hole shape.
6. A mounting plate as defined in claim 5 in which
an additional set of diametrically spaced fastener receiving
openings is provided of different diametrical spacing from that of
the first mentioned fastener receiving openings.
7. A mounting plate as defined in claim 1 in which
said bolt receiving mounting openings have a portion on one side of
said central enlargement spaced from the other face of said plate.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to a mounting for fire detector devices to a
wall or other surface comprising an adapter plate which plate has
spaced holes for mounting selectively on a wall or other surfaces
or on a junction box in the wall, as determined by the requirements
of the particular installation.
2. Description of the Prior Art
Fire detector devices are usually fixedly mounted on a ceiling or
wall and have electric conductors connected thereto. Two wiring
arrangements have been proposed which satisfy the Underwriters
Laboratories fire and safety requirements.
The first arrangement uses a junction box to which the fire
detector device is secured, the wiring being concealed behind the
ceiling and running into the junction box. The second arrangement
utilizes open wiring interiorly strung across the ceiling and which
is limited in voltage and current capacity.
With open wiring the Underwriters Laboratories requires a clearance
of one quarter of an inch from the ceiling with No. 14 wire which
clearance most fire detector devices do not provide. Such devices
have heretofore usually been mounted on junction boxes which
increases the cost of installation considerably.
The present invention overcomes the difficulties heretofore
encountered by utilizing an adapter plate which can be used
satisfactorily with both types of wiring, mounted directly on the
ceiling or mounted on different sizes of junction boxes, thereby
simplifying and reducing the cost of installation.
SUMMARY OF THE INVENTION
A mounting for fire detector devices is provided comprising an
adapter plate which permits of either mounting the device to a
junction box or to a wall or other surface with clearance for
wiring and which additionally has provisions for mounting on
different diametrical sizes of junction boxes.
The principal object of the invention is to provide a mounting for
fire detector devices comprising an adapter plate which can be
mounted to a junction box or directly to a wall or other surface as
required for a particular installation.
A further object of the invention is to provide a mounting plate
which can be mounted to different sizes of junction boxes.
A further object of the invention is to provide a mounting plate
which can be easily attached and detached from junction boxes.
A further object of the invention is to provide a mounting plate
that is light in weight and from which the fire detector device can
be removed for inspection.
Other objects and advantageous features of the invention will be
apparent from the description and claims.
BRIEF DESCRIPTION OF THE DRAWINGS
The nature and characteristic features of the invention will be
more readily understood from the following description taken in
connection with the accompanying drawings forming part thereof, in
which:
FIG. 1 is a plan view of the mounting plate in accordance with the
invention with its spacer rim downwardly disposed;
FIG. 2 is a plan view of the mounting plate of FIG. 1 as seen from
the opposite side and with its spacer rim upwardly disposed;
FIG. 3 is a vertical sectional view taken approximately on the line
3--3 of FIG. 1;
FIG. 4 is a vertical sectional view taken approximately on the line
4--4 of FIG. 2;
FIG. 5 is a view partly in side elevation and partly in vertical
section of a mounting plate and fire detection device in place on a
junction box;
FIG. 6 is a fragmentary vertical sectional view taken approximately
on the line 6--6 of FIG. 5;
FIG. 7 is a vertical sectional view, enlarged, taken approximately
on the line 7--7 of FIG. 6;
FIG. 8 is a fragmentary horizontal sectional view taken
approximately on the line 8--8 of FIG. 7;
FIG. 9 is a view partly in side elevation and partly in vertical
section of a mounting plate and fire detection device in place
mounted to a ceiling or like surface;
FIG. 10 is a fragmentary vertical sectional view taken
approximately on the line 10--10 of FIG. 9;
FIG. 11 is a fragmentary vertical sectional view taken
approximately on the line 11--11 of FIG. 10, and
FIG. 12 is a fragmentary horizontal sectional view taken
approximately on the line 12--12 of FIG. 11.
It should, of course, be understood that the description and
drawings herein are illustrative merely and that various
modifications and changes can be made in the structure disclosed
without departing from the spirit of the invention.
Like numerals refer to like parts throughout the several views.
DESCRIPTION OF THE PREFERRED EMBODIMENT
Referring now more particularly to the drawings the mounting plate
10 as illustrated is of disc shape with a generally flat surface on
each of side faces 11 and 14. The side face 14 has a peripheral rim
12 extending therefrom. The rim 12 serves to space the side face 14
of the plate 10 from a ceiling or other surface 15 to provide a
clearance for wiring to be attached to the fire detector device 20
as is illustrated in FIG. 9 or as an enclosing rim for a fire
detector device 20 as is illustrated in FIG. 5.
The fire detector device 20 can be of any desired type with
diametrically spaced mounting bolts 23 extending thereinto. The
fire or heat detector device specifically illustrated is that shown
in the application for patent of Fred A. Gloeckler filed June 17,
1971 Ser. No. 153,956 but the mounting plate 10 of the invention is
not limited to use only with that device.
The plate 10 is preferably provided, on the face 14 with a
plurality of radially extending stiffening ribs 17 which terminate
at a central opening 18 and which have radial relief grooves 19 on
the face 11.
As shown in FIG. 9 the plate 10 is secured to the exposed surface
at ceiling 15 by screws 21 which are engaged in diametrically
spaced countersunk mounting holes or openings 22 which pass through
the body of the plate 10 at one aligned pair of ribs 17 beyond the
grooves 19. The countersinking is on side face 11 and the rim 12
faces upwardly and bears against the lower surface of the ceiling
15.
In FIG. 5 the rim 12 had been turned downwardly so that the plate
10 can be mounted to a junction box 25 by bolts 26 passing through
diametrically spaced box mounting openings 27 and bearing on side
face 14. The openings 27 are of key hole shape to permit of the
insertion of the heads of bolts 26, turning of the plate 10
relative to the junction box 25 and subsequent tightening of bolts
26.
Additional junction box mounting openings 28 are provided with a
lesser diameter of spacing than between openings 27 and for
particular embodiments the diametrical spacing for openings 27 and
28 having a diameter of three and one quarter inches or four
inches, respectively, for three and one quarter inch or four inch
octagonal junction boxes.
Detector device mounting openings 32, diametrically spaced, are
provided between pairs of ribs 17 and so as to be clear of the
junction box mounting openings 28.
The openings 32 have central enlargements 31 for insertion of the
heads of the bolts 23 and for turning of the detector device 20
after insertion of the bolts 23.
The face 14 has offset portions 40 extending in the same direction
along corresponding portions of the openings 32 and the face 11
opposite the offset portions 40 has slots 41 to accommodate the
heads of the bolts 23 when they are disposed on the face 11.
The detector device 20 can thus be mounted and held against either
face 11 or 14 as required and after the plate 10 has been secured
in place.
If desired Belleville spring washers 38 are interposed between the
plate 10 and detector device 20 on screws 30 to provide for tighter
mounting.
* * * * *