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Патент USA US3089574

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May 14, 1963
o. F. THOMPSON
THERMALLY CONTROLLED DOOR-CHECKS
Filed Nov.- 16, 1959
[,5]
3/29 27%47‘
a
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3,089,568
3,089,568
United States
Patented May 14, 1963
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3,08%568
lustrated in the accompanying drawing and pointed out
in the appended claims.
THERMALLY CONTRULLED DDUR-QHECKS
Oliver E. Thompson, 6867 Ottawa Ave., Chicago, Ill.
Filed Nov. 16, 1959, Ser. No. 853,090
4- Claims. {(Jl. res-4s)
The present invention relates to thermally controlled
door-checks.
' In school or other public buildings it is the usual prac
' In the drawing forming a part of this application, and
in which like designating characters refer to correspond
ing parts throughout the several views:
FIG. 1 is a plan view of a door frame, the door-check
supported therewithin, with the door shut, showing the
door-check and its parts in their operative position;
FIG. 2 is a top elevational view of the parts herein
tree of keeping doors leading from staircases to halls
above mentioned, illustrating the door-check in its opera
and corridors open, so as to prevent constant opening
tive position with the door shut, the view having been
taken upon a plane indicated by line 2-2 of FIG. 1;
and closing of the doors and the resulting banging there
FIG. 3 is a similar view to that of FIG. 2, illustrating
of. This practice is continued even in cases where doors
the door in an open position, with the door-check rendered
are provided with suitable door-checks for normally
keeping doors shut. Often wood wedges or the like are 15 inoperative by the aid of the present device;
FIG. 4 is an enlarged side elevational view of a joint
inserted between the ?oor and the lower edge of the door
between the door-check actuating arm and the door
so as to keep the door open against the action of a door
connecting arm, illustrating the means for connecting
check.
therewith one end of the connecting member for render
The expediency which obliges the doors to be kept open
is fraught with danger because in the event of ?re in
any portion of a building the open door permits the flow
ing the door-check inoperative, as in FIG. 3, for main
taining the door in an open position against the action
of air currents from the staircase into the halls and cor
of the door-check, the view having been taken upon a
ridors, thereby enhancing spreading of ?re.
plane indicated by line 4-4 of FIG. 3; and
PEG. 5 is a similar view illustrating a modi?ed form
Therefore, the main object of the present invention is
the provision of suitable means, in association with the 25 of the connecting means between one end of said con
necting member and the said joint.
door and the cooperating door-check, ‘for rendering the
Referring in detail to the present drawing, there is
latter inoperative when the door remains in an open posi
shown therein wall It} provided with an opening, within
tion, and which means in turn would become inoperative
which a door frame, including an upper horizontal bar ‘
for reestablishing normal operation of a door-check to
close the door whenever ?re occurs in the vicinity of the 30 11 and a vertical bar 12, is located.
The said opening constitutes a passage either from
door.
Another object of the present invention is the provision,
one room to another, or from a staircase to an adjacent
corridor or hall. The said opening is capable of being
closed by door 13, which by one of its side edges is sus
cooperating door-connecting arm, of means connected
therewith and alternately engageable with and disengage 35 pended by a plurality of leaf hinges 14 af?xcd to the
in association with a door-check actuating arm, and its
able from the door, which means, when disengaged from
door and one of the vertical frame bars 12, whereby door
13 may angularly swing from or to the alternate shut
the door, may be capable of permitting normal operation
of the door-check for closing the door, and which means,
or open positions.
Bracket plate 15, by one of its ends is located within
when engaged with the door, may be capable of rendering
the door-check inoperative for maintaining the door in 40 a corner de?ned by the adjacent ends of the horizontal
an open position, and which means, due to in?uence of
frame bar '11 and the vertical frame bar 12. Said bracket
increased temperature due to ?re in the vicinity of the
door, may be capable of instantaneous and automatic
operation for severing its connection between said arms
and the door for reestablishing the normal operation of
the door-check for closing the door.
plate, upon its two edges along the bisecting planes, is
provided with reduced ears 16 for receiving therethrough
Another object of the present invention is the provision,
in association with a door-check actuating arm and the
cooperating door-connecting arm, of a connecting mem
ber engageable with said arms and the door, whereby the
screws 17 which engage the said horizontal bar 11 and
the vertical bar 12, for rigidly supporting the said bracket
plate 15 within the corner of the door frame, as clearly
seen in FIG. 1.
The opposite end of said bracket plate 15 is in a
spaced relation with the upper edge of door 13 and the
upper horizontal frame .bar ‘11, and has supporting plate
18 rigidly a?ixed thereto by means of plurality f screws
door-check may be rendered inoperative for maintaining
19. Rigidly formed with said supporting plate 18, and
the door open, which said connecting member may in
extending therefrom in a central relation in the direction
clude a portion made of fusible metal capable of melt
away from door 13 is block 20 for supporting thereon
ing by the increased temperature engendered by ?re in
the vicinity of the door for severing said connecting 55 spring casing 21, and a downwardly depending therefrom
member for thereby reestablishing normal operation of
the door-check for instantaneously and automatically
closing the door.
A still further object of the present invention is the
provision of most simple means whereby the said con
necting member may be readily connectable with the
hydraulic casing 22.
Said spring casing 21 encloses a wound spring 23, which
is shown by dotted lines in FIG. 2. Said spring 23 by its
outer end is rigidly engaged with the side Wall of said
spring casing 21 on the inner periphery thereof, and by its
inwardly located end rigidly engages shaft 24, which is
said door-check actuating arm, the door-connecting arm
positioned in a vertical central relation with said casing
and the door, without making any extensive structural
21 for a rotary shifting movement in either direction when
changes in the door-check or the appurtenances there
actuated by said spring. 23.
65
of.
In FIG. 1 said spring casing 21 is broken away along
A still further object of the present invention is to
its side Wall, showing in vertical cross section a plurality
generally improve and simplify the existing devices of
of the convolutions of said spring 23, with the innermost
the character hereinabove indicated.
of which said shaft 24 remains in an operative associa
With the above general objects in View and others that
will appear as the invention is better understood, the same 70 tion.
In a rigid association with the upper end of said spring
consists in the novel construction, combination and ar
casing 21, and centrally thereof, there is an upwardly
rangement of parts hereinafter more fully described, il- .
3,089,568
3
extending annular block 25, through which the
proximate to the vertical frame bar 12 with which hinges
upper end of said shaft 24 is extended, and which func
tions as an upper bearing for the latter.
‘One end of the actuating arm 25 is rigidly engaged with
the upper end of said shaft 24, by virtue of which arrange
ment said actuating arm 26 is capable of angular SWing~
ing motions o-n horizontal plane in either direction when
14 are connected.
under the actuation of said shaft 24, to alternately assume
a door-shut position shown in FIG. 2, or a door-open po
The modi?cation shown in FIG. 5 contemplates the
provision of a ball and socket connection, carried by the
lower end of pin 30, with which the door-connecting mem
ber may be connected. This connection includes a socket
member 41 depending from and in any suitable manner
aflixable to the lower end of pin 30. ‘Rod 42 is provided
at its end with ball 43 receivable within the socket mem
ber 41. ‘Connected to the opposite end of said rod 42
sition, illustrated in PEG. 3.
is an S-shaped hook 44, with which fusible plate 45 is
The opposite end of said actuating arm is provided with
connected. A like hook 46 connects with the opposite
an enlarged eye 27, for the purpose hereinafter stated.
end of said plate 45, and is capable of engaging eye 40.
Casing 22 encloses a hydraulically operable mechanism
Whether the door-connecting member shown in FIG. 4
for the purpose of easing the angular shifting movement
of the actuating arm 26 in either direction, for thereby 15 or that illustrated in FIG. 5 is employed, in either case
one or the other fusible plate 38 or 45 is subject to melt
preventing slamming of the door when the latter is
ing due to increased temperature engendered by ?re tak
brought to its shut position illustrated in FIG. 2, or for
ing place in the vicinity of the door. Depending upon
retarding sudden opening of the door when the latter is
the composition of the fusible metal employed in plates
brought to its open position shown in FIG. 3.
Cooperating with said actuating arm 26 is a door-con
necting arm 28, which is adapted for angular shifting
movement upon a plane in a superimposed relation with
the plane upon which said actuating arm 26 shifts. One
end of said door-connecting arm 28 is provided with eye
29, which remains in a vertically alined relation with eye
38 or 47, either one is capable of melting at a compara
tively low temperature, even at a temperature as low as
160 degrees.
From the hereinabove description it will therefore be
seen that either plate 38 or 45 de?nes an insert, inter
mediately of the ends of the connecting members 37-39
27, with the two eyes receiving pin 39, by means of which
and 42-46, respectively, which, when melted, is capable
said arms 26 and 28 are hingedly or pivotally intercon
nected.
of severing one or the other of said connecting members,
The opposite end of said connecting arm 28 is posi
tioned between a pair of horizontal leaves 31 and pivoted
upon pin 32 which is passed through said leaves 31 and
ing arms 26 and 28 to their acute-angled relative position,
shown in FIG. 2, for thereby swinging door 13 to the
closed position with relation to frame 12.
It is noted that either one of said connecting members,
in FIG. 4 or in FIG. 5, when engaged through hook 39
or hook 46, respectively, with eye 40, renders spring 23
the end of said door-connecting arm 28.
Said leaves 31 are integrally formed with bracket 33,
which is affixed to the adjacent face of door 13 by means
of screws 34. The position of said bracket 33 is of course
related to the length of the said door-connecting arm 23,
and this in turn is related to the required angularity of
the door when in an open position with respect to the door
opening, as well as to the required positioning of the
thereby reconditioning the operation of spring 23 for shift
inoperative for angularly shifting arm 26 from its posi
tion shown in FIG. 3, to its acute-angled position with
relation to arm 23, shown in FIG. 2. The inability of
spring 23 to operate in order to angularly shift arms
26 and 28 from their obtuse-angled or right-line relative
door-connecting member which will be hereinafter de 40 position, shown in FIG. 3, to their acute-angled relative
position shown in FIG. 2, results from the fact that the
scribed.
said connecting member remains in a transverse relative
The above substantially describes a conventional door
position with arm 26, thereby preventing the angular
check, supporting means therefor within a door frame,
shifting thereof from its position in FIG. 3 to its position
and its connecting means with the door, and the drawing
in FIG. 2. When the said connecting member remains
illustrates the positions of the various parts of the door
in its operative position shown in FIG. 3, arm 26 will be
check during the shut and open positions of the door.
rendered inoperative for exerting a pulling action upon
'My invention, best shown in FIGS. 3, 4 and 5, consists
arm 28 for closing door 13. ‘It requires severing of the
of means for interconnecting the door-check with the
connecting member, due to the melting of one or the
door when the latter remains in an open position so as
to render the door-check inoperative, that is incapable of '
shutting of the door, unless manually disconnected from
the door, or unless, in case of ?re in the vicinity of the
door and consequent increase of temperature thereabout
the said means itself is rendered inoperative due to the
increased temperature, whereby the operation of the door
check is instantaneously and automatically reestablished
so as to shut the door.
The means aforesaid, which will be presently described,
requires no modi?cation in the mechanism of the door
check hereinabove described, except in pin 30 which forms
a pivot for the joint de?ned by eyes 27 and 29 in arms
other of said fusible plates 33 or 45, as the case may be,
in order to release the hold upon arm 26 and thereby
for reconditioning the operation of spring 23 in order to
close the door.
Depending upon the length of arm 28, and the dis—
tance at which the connecting point 32 is located with
relation to the edge of the door at which hinges 14 are
connected, arms 26 and 28 are capable of assuming a
great range of mutual angular positions when the door
is in an open relation with the frame, shown in FIG. 3,
commencing with a substantially right angle position and
ending with an obtuse-angled position as seen in FIG. 3.
It is therefore to be understood that when reference is
made to a substantially right-angle position of arms 26
26 and 28, respectively. Namely, the lower end of said
pin 39, as shown in FIG. 4, is lengthened to de?ne stub
and 28 such position will include obtuse-angled position,
35, which extends below the lower end of eye 27. Dowel
and conversely by an obtuse-angled position will also
pin 36, or the like, may be extended through said stub 35 65 be understood as including the right angle position.
for preventing the dislocation of the adjacent end of the
For the ei?cient operation of the said connecting mem
door-check actuating arm 26 from said pin 30. One end
ber, either that of FIG. 4 or of FIG. 5, the one or the
of chain 37 is in any suitable manner, such as by hook
other, in its operative position should preferably remain
or the like, connected with said stub 35.
70 in a substantially perpendicular relation with door 13,
‘Adjacent the opposite end of said chain 37, one or
as is seen in FIG. 3.
more links thereof are substituted by plate 38, which is
While the drawing presupposes the door-check as being
connected with frame 12 through bracket plate 15, with
adjacent outer end of said plate 36 is engaged with eye
arm 28 as being connected with the door at point 32,
46 which is a?ixed to door 13, adjacent its edge which is 75 and the connecting member as being connected with the
made of a fusible metal.
Hook 3%‘, connected with the
u
3,089,568
5
arms for inducing relative angular shifting motion to said
door at point 40, it is to be understood however that the
arms for bringing the latter to a substantially acute
device herein disclosed will equally well operate when the
angled mutual relation for thereby swinging the door to a
door-check is connected with door 13. In that latter
closed relation with respect to the frame, an oblong con
case the connecting points 32 and 40 should be upon
frame 12. Such change requires merely reversal of posi C31 necting member, means for engaging one end of said
connecting member with the lower end of said pivot pin,
tions of the several parts relative to the door and the
said oblong connecting member terminating in an op
door frame.
posite end ?xedly carrying a terminal, disengageable con
To recondition the door-check and the door for nor
necting device ‘for disengageably connecting the said op
mal operation, all that is required to be done is to dis
connect chain 37, or the ball and socket connection 10 posite end of the oblong member to a ?xed connecting
member located at a point which is in spaced distanced
41—43, as the case may be, ‘from pin 30, or in the alter
relation with said pivot pin, said device being spaced from
native hook 39 or hook 46, as the case may be, from
contact with said arms, said means for engaging one end
eye 40.
of said connecting member with the lower end of said pivot
For the purpose of accommodating eye 40 within the
bracket plate 15 in the event the latter is in a too close 15 pin and said device both supporting said oblong con~
necting member upon a plane disposed below the plane
proximity to door 13 when the latter remains in a closed
upon which said arms shift and in a substantially trans
position, opening 47 is made in the said bracket plate
15, into which opening said eye 40 is capable of falling,
verse relation with one of said arms with which said ten
that the connecting member aforesaid, shown either in
of said oblong connecting member, said insert being
located at a point which would maintain the said con
frame, said joint including a vertically disposed pivot pin,
sioning means is associated for rendering said tensioning
when the door is brought to a shut position by the door
check, as is indicated by FIG. 1. Obviously, said open 20 means inoperative [for maintaining said arms in a sub
stantially right-angle position for thereby maintaing the
ing 47 and eye 40 should be in alinement so that bracket
door in a ?xed open position relative to the door frame,
plate 15 may not obstruct said eye 40.
and an insert of fusible metal intermcdiately of the ends
From the hereinabove description it will be apparent
FIG. 4 or in FIG. 5, may be easily connected with door 25 capable of melting by an increased temperature resulting
from ?re in the vicinity of the door for thereby severing
checks now in operation with doors.
said oblong connecting member for reconditioning the
Adapting of the said connecting member for use with
operation of said tensioning means for shifting said arms
the existing door-checks, no structural alterations are
to a substantially acute-angled mutual relation for thereby
required in the latter. All that is required to be done
is the lengthening of pivot pin 30 so that the depending 30 bringing the door to a closed relation with respect to the
door frame, the severed parts of the oblong member
stub 35 may extend past the joint forward by said pin
being maintained by said pin and the cooperable relation
30 at the ends of arms 26 and 28, in order that said
of said connecting device and said connecting member in
stub 35 may be engaged with chain 37 or the socket and
positions which are out of the planes of movement of the
ball connection 41—43, as the case may be, and of
door and the arms to thereby prevent said severed parts
course connecting eye 40 with the door, to receive the
from interfering with automatic closing of the door.
disengageable connection for the opposite end of the con—
2. A thermally in?uenced door closing device for induc—
necting member through hooks 39 or 46, ‘as the case
ing closing of a door with relation to a cooperating door
may be.
frame, comprising a pair of arms, a joint formed by the
It is also observed that although the eye 40 is pref
erably engaged with door 13 adjacent the edge thereof 40 adjacent one ends of said arms whereby the latter being
capable of a mutual angular swinging motions for altern
at which hinges 14 are located, the possibility of having
ately assuming a substantially right-angle position when
said eye 40 engaged with frame 12, or for that matter
the door remains in an open relation with the door ‘frame
with any object outside of the door or its frame, is not
or a substantially acute-angled mutual relation when the
excluded, provided that said eye 40- may constitute a
door remains in a closed position with respect to the door
?xed and immovable point with relation to pin 30, and
necting member, when in an operative position, substan
tially in a transverse relation with arm 26 so as to pre
vent the angular shifting movement thereof in the direc
tion which would tend to shift said arm 26 to its acute
the lower end of said pin being extended past said arms
for de?ning a downwardly depending stub, the opposite
end of one of said anms being pivotally connected to the
door, the opposite end of the other of said arms being
pivotally connected to the door frame, tensioning means
for normally urging said arms from a substantially right
angle position to a substantially acute-angled mutual
12, and the resulting increased temperature thereabout,
relation for thereby swinging the door from its open to
to a degree capable of melting the fusible metal of which
either plate 38 or 45 is made, will bring about severance 55 a closed position with respect to the ‘door frame, an oblong
connecting member engageable by one of its ends with
in the corresponding connecting member, rendering the
said stub when said arms remain in a substantially right
latter inoperative, for thereby releasing the hold upon
angle position, the opposite end of said connecting member
arm 26, reconditioning the operation of spring 23-, and
?xedly carrying a terminal disengageable connecting de
thereby bringing door 13 to its closed position with rela
angled position with relation to arm 28, shown in FIG. 2.
Fire originating in the environs of door 13 or frame
vice for disengageably connecting the said opposite end of
tion to the door frame 12, as seen in FIG. 2.
60
the oblong member to a ?xed connecting member which is
While there is described herein a preferred embodi
located at a point which is spaced and distanced from
ment of the present invention, it is nevertheless to be
said stub, said stub, and said connecting device when in
understood that minor changes may be made therein
without depatring from the spirit and scope of the in
engagement with said ?xed connecting member, being
adapted to support said oblong connecting member upon
vention as claimed.
65
a plane disposed below the plane upon which said arms
What I claim as new is:
are positioned, said device ‘and said connecting member be
1. In a door closing device ‘for urging a door to a
closed position with a door frame, a pair of arms, a vertical
ing capable of supporting said oblong connecting member
in a substantially transverse relation with said arms when
the opposite end of one of said arms being pivotally con 70 the latter remain in a substantially right-angled mutual
position for thereby rendering said tensioning means in
nected to the door, the opposite end of the other of said
operative for thereby maintaining the door in a ?xed
arms being pivotally connected to the door frame, said
pivot pin interconnecting the adjacent ends of said arms,
arms assuming a substantially right-angle position when
opened position with respect to the door frame, and
an insert of fusible metal intermediately of the ends of said
the door remains in an open position relative to the door
frame, tensioning means in association with one of said 75 oblong connecting member, said insert being capable of
3,089,568
8
melting by an increased temperature resulting from ?re
in the vicinity of the door for thereby severing said oh
long connecting member fcr reconditioning the operation
of said tensioning means for shifting said ‘arms to a sub
3. The device of claim 1 where said connecting member
is a chain.
4. The device of claim 1 wherein the ?xed connecting
member is mounted to said door.
stantially acute-angled mutual relation for thereby auto
matically bringing the door to a. closed position with re
spect to the door frame, the ‘severed parts of the oblong
member being maintained by said stub and the cooperative
relation of said connecting device and said connecting
member in positions which are out of the planes of move 10
ment of the door and the arms to thereby prevent said
severed parts from interfering with automatic closing of
the door.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,257,301
Ball ________________ ___ Feb. 26, 1918
1,278,465
1,319,173
2,056,876‘
Henry ______________ __ Sept. 10, 1918
Norton ______________ __ Oct. 21, 1919
Williams ____________ _- Oct. 6, 1936
2,329,476
Livingston __________ __ Sept. 14, 1943
_e._ .,
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