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Патент USA US2411266

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NOV’ 19, 1946.
w. HAMILTON
2,411,266
SOLENOID LOCKED PUSH DOOR
Filed Oct. 19, 1945
2 Sheets-Sheet l
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INVENTOR
WALLACE HAMlLTON
BY %
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‘
IATTOiNEYS
Nov. 19, 1946.
w. HAMILTON
2,411,266 .
SOLENOID LOCKED PUSH DOOR
Filed Oct. 19, 1945
2 Sheets-Sheet 2
a“.
INVENTOR
WALLACE HAMILTON
BY
ATTO
EYS
-
Patented Nov. 19, 1946
V 2,4ll,266
UNITED ; STATES _ PATENT OFFICE .11
SOLENOID, LOCKED PUSH noon
Wallace Hamilton, Albany, N. Y., assignor to . 1
Consolidated Car-Heating Company, Albany,
N. Y., a corporation of New York
,
Application October 19, 1945, Serial No. 623,196
9 Claims. (Cl. 292-1)
1
2
This invention relates to improvements in
door operating mechanisms and locking devices
Figure 5 is a diagrammatic and schematic cir
cuit arrangement for controlling the solenoid lock
therefor.
The general object of this invention is to pro
vide an improved and simpli?ed mechanism for
e?ecting the opening and closing of doors par
ticularly of the push type as frequently employed
so as to lock the door in closed position only. »
on vehicles of various types as, for example, buses.
An object of this invention is to provide a sim
,
.
The description of the mechanism and its oper
ation will be given vunder the assumption that
the invention has been applied to a vehicle such
as a modern motor coach, although it will be
apparent from the disclosure that the invention
is not limited to such use and indeed is not lim
ple locking mechanism for this type of door in 10 ited to use on vehicles. In. accordance with this,
the form‘ of a solenoid.
assumption and as is quite ‘frequent practice, a
‘
A more speci?c object of the invention is to
provide a combination in which the solenoid lock
acts to lock the door in the closed position, and
also, if "desired, in the open position.
pair. of door shafts H3 and‘ II are‘ iournaled in
suitable bearing ‘members on vertical‘ parallel
axes at the side edges of ‘the door opening. 1 In
15 the form o-fmechanism illustrated, the door com;
'
Another object is to provide a control in the
combination of the foregoing object whereby the
unlocking of the door for opening or closing is
under the control of an attendant as, for exam
prises a pairof leaves 12- and I3‘ attached‘ to the
shafts m and I l, respectively, for‘ rotation there
with and meeting on a vertical central line with
respect to the door opening; ‘As will appear later,
20 these door leaves swing‘ from‘a common plane
ple, the bus driver.
when in closed position outwardly and away from
A broader object of the invention is to provide
each other to a position at right angles to the
a push door operating and locking mechanism
door closed plane so as to project exteriorly of
which may be applied to the rear or remote door
or doors of a vehicle without causing undue acci
the vehicle. The shafts I0 and H are shown
25 journaled on their upper‘ ends in any suitable
dent hazards.
form of bearing members l4 and I5 mounted on
Still another object of the invention is to pro
vide a push door construction. which permits of
some suitable portion of the bus structure.
opening the door by pushing thereon and wherein
there is employed a spring operated motor, such
tending across the top of the door opening and
as a door check, for closing the door.
’
‘
,
Other and‘more detailed objects of the inven
tion will be apparent'from the following descrip
tion of the single embodiment thereof illustrated
in the attached drawings.
‘
This invention resides substantially in the com
bination, construction arrangement and relative
location of parts as will be described in detail
below.
,
In the accompanying drawings
Figure l is an elevational View of the mecha
nism of this invention and a portion of the doors
over which it is mounted ‘when viewed, in the‘
case of application‘ to a vehicle, from the inside
thereof;
Figure. 2‘ is a top plan view of the mechanism
of Figure 1v showing some parts in cross-section
and some parts broken away ‘to improve the illus
tration, the parts being shown in door closed
position;
-
.
.
Figure 3 is a view similar to Figure 2 showing
the doors in full open position;
Figure 4‘is ‘a, diagrammatic and schematic cir
Ex_
lying in a horizontal plane is a lintel or other
suitable form of supporting plate I6 on which
the overhead mechanism‘ is mounted. In this
case‘this‘ mechanism includes a suitable form of
supporting L-shaped bracket 2! on which the
mechanism parts ‘are, mounted.
.
Attached to the door shafts l0 and II for rota
tion therewith are the levers‘ l1 and I8 which are
respectively connected'by means of rigid links or
rods l9 and 20 to the arms 21 and 29 of a three
armed lever which includes the arm 28. The arm
28 is pivotally connected by the link 26 to a bell
crank lever ‘having the arms 24 and 25 pivotally
mounted on the pin 23 forming part of‘a stand
ard 22 mounted on the bracket 2|.
The three-pronged lever is secured to the ro
tat'alble ‘shaft 30 of any ‘suitable form of com
monly used‘ spring biased type of door check 3|
- which is shown secured to the vertical wall of
the bracket 2 !. Mounted upon or formed on the
door check' shaft 30 is a cam 32 positioned to
engage the roller on‘the operating arm 34 of a
single-pole double-throw switch 33 supported in
any suitable manner, not shown.
‘
The free ‘end of the arm 25 of the bell crank
cuit arrangement for controlling the solenoid
of which it’ is a part is bifurcated and engages
look so as to lock the door in both open and closed
55 a pin mou‘nted‘in the ‘bifurcated end‘of a plunger
position; and
2,411,266
4
36 for the solenoid 31.
The solenoid 31 has an
inwardly projecting core piece 38 which may be
longitudinally adjusted within the passage in the
solenoid and locked therein in any suitable man
ner as, for example, by means of a lock nut as
shown.
Thecircuit arrangement is illustrated in Fig
ure 4. One terminal of the solenoid 3'! is con
a point of maximum stress when the door is fully
open. It, of course, tends to close the door but
the solenoid prevents this. After all the pas
sengers have moved through the doorway the ve
hicle operator moves switch 40 back to its orig
inal position de-energizing the solenoid 31 in an
obvious manner.
This releases the door so that
the stress spring in the door check; can return
nected to one terminal of any suitable form of
all of the parts including the door leaves to closed
current source 39. The other terminal of the 10 position. The operation of switch 33 is reversed
solenoid is connected to the movable contact of
so that just as the door is fully closed solenoid
a single pole double throw switch 40 adapted to
31- is again energized to lock the door in closed
be placed under the control of an attendant as,
position. It will, of course, be understood by
for example, the bus operator. In this ?gure the
' those skilled in the art that switch 40 can be
single-pole double-throw switch 33 is diagram; 15 tied in in many ways with the operation of the
matically illustrated and is shown with its mov
vehicle so that its operation is automatic.
able‘ contact connected to the other terminal of
In conditions of use where it is not necessary
the current source 391. The ?xed contacts of the
to lock the door open a very simpli?ed circuit
switches 33 and 40 are connected together in pairs .
arrangement as shown in Figure 5 can be em
as shown.
20 ployed, in which case the manual switch 40 is
The following comprises a description of the
merely opened when it is desired to free the doors
operation of this mechanism. The circuit of Fig
for opening, and remains open until the door is
ure 4 shows the position of the switches when
closed, whereupon it is closed to re-energize the
the door is closed and locked at which time the
locking magnet. Of course, in this case the
solenoid 37 is energized as follows: Current ?ows 25 switch 33 and the cam operator 32 are not em
from the source 39'through the winding of the
ployed.
solenoid 31 to the movable contact of switch 4|],
A study of the linkage system will show that
from there to the movable contact of switch 33
when the door is closed and although the toggle
and back to the current source 39. Thus the
arrangement formed by the links i9 and 20 and
solenoid 31 is energized. _
30 the three-armed lever is not in straight line ar
V Figure 2 shows the linkage system of the doors
rangement it is nearly so, ‘with the result that a
in the position they assume when the door is
relatively small force exerted by the solenoid, 31
closed at which time the'inner end of the plunger
when its effect is multiplied through the bell
36 is ‘closely adjacent to the ?xed core 38 of the
crank connection, in effect exerts a much greater
solenoid. I In'order to condition the door so that 35 f force to prevent the opening of the doors.‘ .It
it may be pushed open the vehicle operator at
will be noted that the plunger 36 is closely Jad
the proper time ‘operates switch 40 from the posi
tion shown in Figure 4 to its other position break
ing the circuit to the solenoid 31 in an obvious
jacent to the core during door open and door
closed position so that the maximum eiiect of
the magnetic ?eld is secured. Similarly, when
mannen ' A person wishing to alight through the 40 the door is locked in open position the bell crank‘
doors pushes on one or both leaves thereof caus
and connecting links with the three-armed lever
ing a reaction through the linkage system to elfect
clockwise rotation (Figure 2) of the three-armed
lever 21—2B—29 from the position shown in Fig
ure 2 to the ultimate position shown in Figure 3.
The ?rst movement of the three-armed lever
causes clockwise rotation of the bell crank 25-24
which it will be seen causes the plunger 36 to
move to the right, that is away from the core 38.
From the kinematics of the linkage system it will
be apparent that as rotation of the three-armed
lever continues, the bell crank will reach a posi
tion of rest at the end of its clockwise rotation
and then as the three-armed lever continues to
rotate in a‘ clockwise'rotation, as the doors ‘ap
proach full ‘open vposition, the bell crank'lever
will begin'to rotate-in a counterclockwise direc
tiOIlr'fThiS movementof the bell crank will con
magnify the force exerted by the magnet so that
a large force would have to be applied to the
doors to close them.
A very important and practical feature of this
invention resides in the fact that the toggle link
age system is so arranged and therplunger 3t'is
so positioned with respect to the core 38 that a
maximum closing eiiortis applied to the door
just before it reaches fully closed position. It
will be understood, upon consideration, that at
that time the door check spring is exerting its
minimum closing eiiect-since it is most nearly
relaxed. Thus the locking magnet and linkage
system are contributing their maximum closing
elTect at the time when most needed, namely
when the door check is least active for that-pur
pose.
~
A further feature of this arrangement resides
tinue with the parts properly proportioned so that
when the door is fully opened plunger 36'will 60 in the fact that again the maximum magnet
and linkage actions are exerted when the door is
move back to its initial position most closely ad
closed, thereby resisting!‘ any tendency of the’
jacent, with respect to its end,,tovthe ?xed core 38.
doors under the centrifugal‘ forcesv incident to
When the door'begins to open the lower por
operation of the vehicle from tending to open
tion cam 32 will operate the switch 33' to dis
connect the current source from the upper con
even slightly.
tact ‘(Figure 4) and hold that position until the
door‘ reaches fully open position, at which time
that the spring of the door check is exerting its
the higher portion of’ cam 32 will move the switch
arm stilljfurther (see Figure 3), at which time
the switch will close on the lower contact com
pleting a circuit from the left hand contact of
switch 40 through switch 33 for the solenoid 31
which becomes energized and locks the door in
open position. During the'opening movement the
spring of the door check 3| is 1being‘stIfeEiSed 1K?
Of course, it is at this very time
Thus, by the interacting are
rangement of the locking magnet parts and link
age system as disclosed, any tendency of the door
to open at an undesired time is completely pre
‘ minimum force.
vented.
-
>
'
i
-
From the above description it will be‘ apparent
to those skilled in the art that the structural.
details of this invention are capable of consider;
able valiation Without departure from the ‘novel
’
2,411,266
5
6
subject matter herein disclosed. I do not, there
fore, desire to be limited by the disclosure which
ated upon movement of said door shafts to ?rst
de-energize said solenoid at the beginning of
opening movement and to energize it again at
the end of the opening movement.
has been given in an illustrative sense but rather
by the terms of the appended claims.
What is claimed is:
1. In a door operating system, the combina
tion including a pair of door shafts, a spring
biased door check having a multiple armed lever
5. In the combination of claim 1, circuit means
for energizing said solenoid including a switch
operated by said door check for controlling the
energization of said solenoid.
connected thereto, linkage systems for connect
6. In the combination of claim. 1, circuit means
ing said shafts to a pair of the arms of said lever, 10 for energizing said solenoid including a manual
a solenoid having a reciprocable plunger, and a
switch and a switch operated by said door check
linkage system interconnecting said plunger with
whereby when the manual switch is positioned
for door opening operation the other switch re
another arm of said lever, said plunger lying in
the same position with respect to said solenoid
energizes the solenoid at the end of the‘ opening
for door open and door closed positions.
15 and closing movements.
2. In a door operating system, the combina
7. In the combination of claim 1, circuit means
for energizing said solenoid including a switch
tion including a pair of door shafts, a spring
biased door check having a multiple armed lever
for energizing the solenoid to lock the door in
connected thereto, linkage systems for connect
closed position.
'
ing said shafts to a pair of the arms of said lever, 20 8. In a door operating system, the combination
a solenoid having a reciprocable plunger, and a
including a door shaft, a spring biased door check,
a toggle linkage system for connecting said shaft
linkage system interconnecting said plunger with
an arm of said lever and adapted to cause the
and door check, a solenoid having a reciprocable
plunger connected to said linkage system, and
plunger to move from an initial position and back
to that initial‘ position during the opening or
means for controlling the energization of said
closing movement of the door shafts.
3. In the combination of claim 1, means for
energizing said magnet including a switch oper
ated upon movement of said door shafts to in
solenoid, said magnet and toggle linkage system
exerting a maximum closing effort on. said shaft
When it is in door closed position.
9. In the combination of claim 8, the spring
terrupt the circuit of said solenoid at the begin 30 of said door check being most relaxed in door
ning of opening movement and to complete it at
closed position of said shaft and said solenoid
the end of the opening movement.
and magnet system at that time exerting a max
imum closing effort.
4. In the combination of claim 2, means for
energizing said magnet including a switch oper
WALLACE HAMILTON.
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