Information
-
Patent Grant
-
6510587
-
Patent Number
6,510,587
-
Date Filed
Monday, May 14, 200123 years ago
-
Date Issued
Tuesday, January 28, 200321 years ago
-
Inventors
-
Original Assignees
-
Examiners
- Will; Thomas B.
- Pechhold; Alexandra K.
Agents
-
CPC
-
US Classifications
Field of Search
US
- 016 82
- 016 83
- 292 342
- 292 DIG 4
-
International Classifications
-
Abstract
A door closure preventing device is mounted on the inside surface of a door and has a pivotal stop moveable between a deactivated position within the periphery of the door and the extended position extending beyond the periphery of the door to prevent closure of the door. The pivotal stop is moved to its extended position following opening of the door by a user and is then released to move by a spring to an intermediate position projecting beyond the door periphery following which closure of the door results in engagement of the door jamb by the stop to prevent complete closure. Engagement of the stop with the door jamb also returns the stop to is fully extended position and actuates a rotary latch so that upon subsequent opening movement of the door by the user the stop is automatically returned to its fully retracted position to permit a conventional door closure apparatus to fully close the door.
Description
BACKGROUND OF THE INVENTION
The subject invention is directed to the field of door blocking devices for preventing a door from moving from an open position to a fully closed position.
Many commercial establishments are provided with doors which permit employees and customers to readily exit from the establishment in case of emergency, such as, fire or other hazards in the establishment. While the front doors of commercial establishments such as retail shops, restaurants and the like are normally maintained in an unlocked condition during business hours, such establishments also frequently have other portals or doors in the rear of the establishment which are maintained in a closed and locked condition and which cannot be opened in a normal manner by persons in the area outside the door. However, it is essential that such doors be capable of being opened from inside the building for use in routine matters, such as, removable of trash. On such occasions, it is frequently desirable to maintain the door in an open non-closed condition for a short time to permit reentry of the user; however, the user frequently has his hands full and cannot manually hold the door in an open position and must spend an inordinate amount of time in effecting blockage of the door.
A wide variety of devices for holding doors in open position have consequently been proposed by those of skill in the art. However, the previously known devices have suffered from a number of shortcomings, such as, being overly complicated and consequently expensive and requiring the user to manually manipulate the closure preventing device in a variety of ways for deactivating the device to permit door closure following return of the user into the building. It is consequently sometimes difficult for a user returning to the building with a cumbersome item, such as, an empty trash container to easily and effective deactivate the door-stopping device while holding the door open against return to its closed position. Other devices require the provision of separate items, such as, brackets, keepers or the like, which must be attached to the door frame or floor for engagement with apparatus attached to the door so as to retain the door in a latched open position. Such devices consequently require substantial labor for installation and maintenance and also in some instances can create a safety hazard.
With respect to the prior art which is directed to devices requiring separate latches or the like attached to the door frame or the floor of the building adjacent to the door which cooperate with door mounted means for maintaining the door in an open position, it should be noted that U.S. Pat. Nos. 646,533; 759,013; 900,621; 1,493,794 and 3,620,483 all relate to devices employing cooperating means attached to the building or floor structure. Similarly, U.S. Pat. DES. 346,109 discloses a door spacer device apparently mounted on a door frame; however, the mechanical structure and operation is not apparent from the disclosure of such patent.
It should also be noted that latch devices for windows, cabinets and the like have been provided with a variety of rotary latch means for holding linear telescopically mounted members in axially adjusted position by use of rotary latches and the like, such as exemplified in U.S. Pat. Nos. 4,042,266; 4,331,355; 4,688,834; 4,709,949; 4,779,906; 4,790,580; 4,932,695 and 5,217,267 all relate to such telescopically mounted latchable devices. Prior art devices requiring separate manual manipulation for disengaging a door stop are exemplified by U.S. Pat. Nos. 1,921,568; 2,565,906; 3,287,050; 3,737,186; 3,809,419, 4,570,984; 4,686,740 and 5,123,685. Other devices such as exemplified by U.S. Pat. Nos. 4,925,072 employ means for latching a closure in position so that it can be reopened by pressure toward the closed position.
Therefore, it is the primary object of the preferred embodiment of the invention to provide a new and improved door blocking device for retaining a door or other closure in a non-closed position.
A further object of the present invention is a provision of a new and improved door blocking device which does not require any manual manipulation of the device for achieving deactivation of the device.
Yet another object of the present invention is the provision of a door blocking device which is deactivated solely by movement of the door toward a more open position from a closure preventing position.
Yet another object of the present invention is the provision of a reliable and economical door blocking device which is initially actuated by the user while opening the door so as to arm the device to preclude full door closure until such time as a further movement of the door toward the open condition is effected.
BRIEF SUMMARY OF THE INVENTION
The preferred embodiment of the subject invention achieves the foregoing objects by the provision of a base member which is attached to an edge portion of the internal surface of an external access providing hinged door of a building. The base member supports a pivotal stop which can pivot between a first or deactivated stop position in which the pivotal stop is positioned within the periphery of the door and a second or extended activated stop position extending beyond the door periphery. The pivoted stop is spring biased towards its first or deactivated position but is prevented from returning to first or deactivated position by rotary latch until such time as the user initiates return to the building. The rotary latch is mounted on the pivotal stop and a series of pivotal movements of the pivotal stop brings the rotary latch into contact with a series of cam surfaces which rotate the rotary latch into a series of positions required during each cycle of operation of the invention.
A cycle of operation begins when a user opens the door and then manually moves the pivotal stop in an opening direction from its first or deactivated position to a second or extended activated position which results in contact of the rotary latch with a first positioning cam surface which rotates the latch into a second position. The user releases the pivotal stop which permits the spring biasing the pivotal stop to move the pivotal stop in a closing direction to an intermediate position in which the rotary latch engages additional positioning cam surfaces which position the latch so that it terminates the closing movement of the pivotal stop. The pivotal stop is consequently held in the intermediate position in which the pivotal stop extends beyond the periphery of the door. The user subsequently releases the door which swings towards its closed position by operation of conventional door closing apparatus. However, the pivotal stop engages the door jamb and prevents full closure of the door with such engagement resulting in pivotal movement of the pivotal stop back to its second or extended position while still preventing fall closure of the door.
The last-mentioned movement of the pivotal stop back to its second or extended position also results in contact of the pivotal stop with positioning cam surfaces in a return enable position where it remains until the user decides to return inside the building and manually opens the door. Opening of the door terminates contact of the pivotal stop with the door frame so that the spring bias effects a rapid return movement of the pivotal stop to its first position in which it is fully within the confines of the door periphery and does not interfere with full door closure being effected by the conventional door closing apparatus when the door is released by the user. During the last-mentioned movement of the pivotal stop, it passes through the intermediate position so that the rotary latch engages positioning cam surfaces which rotate the latch into its final position in which it is properly positioned for the next cycle of operation. It is significant that the user's only contact with the pivotal stop is when he initially moves the stop to its second or extended activated position.
BRIEF DESCRIPTION OF THE SEVERAL VIEWS OF THE DRAWINGS
FIG. 1
is a front elevation view from a building interior illustrating the preferred embodiment of the invention mounted on a conventional exterior access door;
FIG. 2
is a sectional view taken along line
2
—
2
of
FIG. 1
illustrating the door in a closed condition and the preferred embodiment in an unarmed deactivated position;
FIG. 3
is a section view taken along line
3
—
3
of
FIG. 1
illustrating the door in a closed condition in which the preferred embodiment is in its unarmed deactivated position with the rotary latch being in a first or transit position;
FIG. 4
is a sectional view taken along line
3
—
3
of
FIG. 1
but illustrating the parts in a position subsequent to the
FIG. 3
position with the door in an open position, the pivotable stop in a fully extended position and the rotary latch in a second or latch ready position;
FIG. 5
is a sectional view taken along line
3
—
3
of
FIG. 1
in a position subsequent to the
FIG. 4
position with the door in a subsequent open position to that of FIG.
4
and the pivotable stop in an armed intermediate holding position assumed in response to manual release of the pivotable stop from the
FIG. 4
position and with the rotary latch being in a third or latching position;
FIG. 6
is a sectional view taken along line
3
—
3
of
FIG. 1
illustrating the position of the components assumed subsequent to the
FIG. 5
position in response to movement of the door toward its closed position by conventional door closing means with the rotary latch being in a fourth or return position;
FIG. 7
is a sectional view taken along line
3
—
3
of
FIG. 1
but illustrating the parts in a subsequent position to the position of
FIG. 6
resultant from manual opening of the door from the
FIG. 6
position;
FIG. 8
is a sectional view taken along line
3
—
3
of
FIG. 1
illustrating the parts in a position subsequent to the position of FIG.
7
and which is the last position assumed during a cycle of operation;
FIG. 9
is an exploded perspective view of the preferred embodiment of the invention;
FIG. 10
is a front elevation view of rotary latch means employed in the preferred embodiment.
FIG. 11
is a sectional view of the rotary latch taken along line
11
—
11
of
FIG. 10
; and
FIG. 12
is a bottom elevation view of the rotary latch.
DETAILED DESCRIPTION OF THE INVENTION
The preferred embodiment of the invention, which is generally designated
20
in
FIG. 1
as viewed from the interior of the building in which the invention is used is mounted on the inside surface of a conventional outside access door
22
which is hingedly mounted on the right side
24
of a conventional door frame which also includes a horizontal top frame component
26
and a left side member
28
. A conventional door closure effecting apparatus
30
extends between the door and the horizontal top frame component
26
in well-known manner for urging the door towards its closed position which is shown in
FIGS. 1 and 2
. An emergency exit release device
32
is also provided on the door for actuation in a well-known manner in case of the need for an emergency or routine exit from the interior of the building.
When the door
22
is swung open by movement of the left side of the door away from the left side door frame member
28
, the preferred embodiment
20
of the invention is manually actuated in a manner to be discussed so that the door is prevented from returning to the fully closed position of
FIG. 1
; however, the door is permitted to return to a holding position that is fairly close to the door frame but beyond which the door cannot move inwardly toward the fully closed position. A significant aspect of the invention is that when the door is subsequently moved outwardly beyond the holding position, such as when the user preparing to reenter the building, the closure prevention device
20
is deactivated or dearmed so that the door is subsequently permitted to be fully closed by the conventional door closure means
30
after the user enters the building without need for any further action by the user.
Turning now to the specifics of the preferred embodiment, attention is initially invited to
FIG. 9
of the drawings which illustrates the structure of the preferred embodiment in detail. Specifically, a mounting base
34
of un-shaped configuration and formed of stainless steel or other heavy strong metal includes a foot plate
36
from opposite ends of which a first end shoulder
38
and a second end shoulder
40
extend upwardly and are connected by a peripheral wall portion
41
. Additionally, a first pin supporting shoulder
42
extends unitarily from first end shoulder
38
and a second pin supporting shoulder
43
extends upwardly from foot plate
36
adjacent to, but spaced from, second end shoulder
40
. A pin receiving bore
44
extends through first end shoulder
38
and first pin supporting shoulder
42
and is axially aligned with a pin receiving bore
45
in pin supporting shoulder
43
and an end bore
46
in second end shoulder
40
. Foot plate
36
additionally includes three countersunk openings
48
for receiving mounting screws for attaching mounting base
34
to hingedly mounted door
22
in the manner shown in FIG.
1
.
Mounting base
34
also provides support for a latch control guide generally designated
60
which includes an end plate
61
along the outer edge periphery of which an arcuate latch guide and control rib
62
having an arcuate inner surface
63
extends as best shown in
FIGS. 3 and 9
. Latch positioning cam or a latch control block
64
is uniformly formed with end plate
61
. Latch control block
64
, support or end plate
61
and latch guide rib
62
are a unitary structure. It should be noted that control block
64
also includes a first latch positioning cam surface
10
and a second latch positioning cam surface
12
(
FIG. 3
) which intersect along comer line
11
as shown in
FIG. 3. A
third latch positioning cam surface
14
and a fourth latch sequential positioning cam surface
16
at the end of arcuate surface
63
are provided on latch guide and control rib
62
and act to control positioning of a rotary latch
100
.
A pin receiving bore
67
extends through end plate
61
and latch control block
64
in axial alignment with bores
44
,
45
and
46
for receiving a pivot shaft
50
having an axis
51
and a knurled end surface
52
. Pivot shaft
50
extends through all four bores
44
,
45
,
46
and
67
and has its knurled end surface
52
jammed and frictionally retained in bore
46
. Pivot shaft
50
provides pivotal support for a pivotable stop
70
. Rotary latch
100
is supported on a latch supporting pin
94
mounted in the right end of pivotable stop
70
for sequential rotary positioning by cam surfaces
10
,
12
,
14
and
16
during each cycle of operation as discussed hereinafter.
An upwardly extending spring end retaining lug
37
extends upwardly from foot plate
36
and receives end
56
of torsion spring
57
. the body of torsion spring
57
is mounted on pivot shaft
50
and has a second end
58
received in a similar lug
39
on pivotable stop
70
so that torsion spring
57
always provides a braising force on pivotable stop
70
tending to rotate pivotable stop
70
in a clockwise direction about pivot shaft
50
as viewed in
FIGS. 2 through 8
.
Pivotable stop
70
comprises a shell-like ridged metal body
71
having a peripheral wall
72
and a plurality of transverse rib plates
74
extending upwardly from a floor plate
76
. Additionally, cylindrical studs
78
and spring end retaining lug
39
also extend upwardly from base plate
76
. A urethane foam pad
80
is attached to pivotable stop
70
by conventional spring-lock retainer means
82
which are received in counter sunk recesses
84
in which the upper ends of mounting studs
78
extend. Foam pad
80
includes an arcuate spring cover extension
81
which covers the body of spring
57
.
Pivotable stop
70
additionally has first and second pivot bearing lugs
86
and
88
having aligned bores
90
and
92
through which pivot shaft
50
extends. Pivotal stop
70
is consequently mounted for pivotable involvement between a closed deactivated position shown in
FIGS. 1 and 2
and a fully extended position shown in
FIGS. 4 and 6
.
The rotary latch support pin
94
has an axis
95
with a smooth bearing surface
96
(
FIG. 9
) and a knurled outer end portion
98
which is frictionally jammed and retained in a bore in the right end of pivotal stop
70
. Pin
94
extends through a small diameter bore
101
and a large diameter bore
105
(
FIGS. 10
,
11
and
12
) of rotary latch
100
which is supported for rotation on smooth bearing surface
96
of pin
94
which is positioned in small diameter bore
101
of rotary latch
100
. A low friction washer
102
and a thrust washer
104
maintain the rotary latch in alignment with inwardly facing latch positioning cam surface
16
of latch guide rib
62
while permitting rotary latch
100
to remain rotatable to multiple operative positions on pin
94
.
The rotary latch
100
is a generally rectangular metal plate having parallel planar side surfaces
106
and
108
which are connected at their end portions by first and second v-shaped surfaces as best shown in FIG.
10
. The first v-shaped surface is defined by planar end surfaces A and B and the second v-shaped end surface is defined by planar end surfaces C and D. It should be noted that the intersection of the planar end surfaces A and B with each other is in alignment with the common axis of small diameter bore
101
and larger diameter bore
105
of latch
100
and the same is true with respect to the intersection of planar end surfaces C and D. Also, the intersection of the planar end surfaces with the side surfaces is defined by rounded comers A
6
, D
6
, C
8
and B
8
as shown in FIG.
10
.
A cycle of operation of the preferred embodiment begins with the components in the positions illustrated in
FIGS. 1
,
2
and
3
in which door
22
is closed and pivotal stop
70
is in its unarmed deactivated position fully within the confines of the door periphery. Also, the rotary latch
100
is in a first or transit position relative to pivotal stop
70
.
The user initially engages the emergency exit release device
32
and opens the door and promptly manually engages pivotal stop
70
and rotates it upwardly in a counterclockwise direction about pivot shaft
50
from its
FIG. 3
unarmed deactivated position to its fully extended position shown in FIG.
4
. During the foregoing movement rotary latch
100
remains in the
FIG. 3
first or transit position relative to pivotal stop
70
until the pivotal stop moves into its fully extended position at which time rounded comer D
6
concurrently contacts the first latch positioning cam surface
10
and rotary latch
100
is rotated into a second or latch ready cocked position illustrated in FIG.
4
. Latch
100
is precluded from rotation beyond the desired position shown in
FIG. 4
by contact of latch end surface C with second latch positioning cam surface
12
. The second or latch ready position of rotary latch
100
which is shown in
FIG. 4
is transient position necessary in order for rotary latch
100
to be subsequently moved into a third or latching position at the completion of the next movement of pivotable stop
70
to the intermediate holding position illustrated in FIG.
5
.
More specifically, movement of pivotable stop
70
from its fully extended position of
FIG. 4
to its intermediate holding position of
FIG. 5
is immediately initiated by the user's release of pivotable stop
70
promptly upon its arrival at its
FIG. 4
position which release permits torsion spring
57
to rotate pivotable stop
70
in the clockwise direction of arrow A
2
as shown in FIG.
5
. Such rotation of pivotable stop
70
from its
FIG. 4
position in the direction of arrow A
2
results in end surface D of rotary latch
100
initially coming into contact with third latch positioning cam surface
14
and comer edge
69
which rotates pivotable latch
100
counterclockwise about latch supporting pin
94
into the third or latching position shown in FIG.
5
. The foregoing rotation is terminated by engagement of comer A
6
of latch
100
with the inwardly facing fourth latch positioning cam surface
63
of latch guide rib
62
so that movement of the pivotable stop in direction A
2
is immediately terminated.
The user subsequently releases the door and consequent movement of the door in the closing direction shown by arrow A
3
(
FIG. 5
) caused by operation of the door closure apparatus
30
results in contact of the urethane foam cushion
80
of pivotable stop
70
with the surface of horizontal top frame component
26
of the door frame which causes pivotable stop
70
to be pivoted counterclockwise back towards its fully extended open position shown in FIG.
6
. Full closure of the door is consequently prevented and the door is maintained in its unclosed holding position of
FIG. 6
awaiting return of the user.
Return of stop
70
from its
FIG. 5
position to its
FIG. 6
fully extended open position also results in repositioning counterclockwise movement of rotary latch
100
into a fourth or return enabling position due to contact of corner C
8
and with first latch positioning cam surface
10
and subsequent contact of surface
108
with corner edge
11
which rotates rotary latch
100
in to the fourth or return enabling position shown in FIG.
6
.
The final step in the cycle of operation is effected by the user's return and initiation of opening movement of door
22
from its
FIG. 6
unclosed holding position towards its open position in the direction of arrow A
4
in FIG.
7
. Such action causes the pivotable stop
70
to clear the surface of the horizontal top frame component
26
so that the torsion spring
57
immediately rotates the pivotable stop
70
about pivot shaft
50
in a clockwise direction shown by arrow A
5
in FIG.
7
. The initial movement of the pivotable stop from its
FIG. 7
towards its
FIG. 8
position causes surface
106
of rotary latch
100
to engage corner edge
69
of latch guide rib
62
which causes rotary latch
100
to rotate in a counterclockwise direction on pin
94
into a fifth or return home position which it retains as the pivotable stop returns to the
FIG. 8
position. It should be noted that the only difference between the
FIG. 3
position and the
FIG. 8
position is that rotary latch
100
has been rotated one hundred and eighty degrees (180°). Thus, rotary latch
100
has in effect been returned to a mirror image of its
FIG. 3
first position. Naturally, completion of the next door cycle of operation will return the rotary latch
100
to the precise
FIG. 3
position.
It should be understood that the present application describes the preferred embodiment of the invention but that the scope of the invention is not limited to the present disclosure but is defined solely by the appended claims. Numerous modification of the invention will undoubtedly occur with skill in the art but it should be understood that such modifications do not necessarily avoid the coverage provided by the appended claims.
Claims
- 1. A door closure prevention device mountable on a moveable door positioned for movement between an open position and a closed position relative to a fixed door frame for selectively preventing movement of the door from an open position to a closed position while being easily deactivated to permit return of the door to its closed position, said door closure prevention device comprising:(a) a mounting base including connection permitting means permitting attachment of said mounting base to a movable door having a periphery hingedly moveable relative to an adjacent fixedly positioned door frame structure between an open position in which the periphery of the door is largely external of said fixedly positioned door frame structure and a closed position in which said periphery of the door is positioned within said fixedly positioned door frame structure; (b) a pivotable stop mounted on said mounting base for pivotal movement about a stop pivot axis in an opening direction from an unarmed deactivated position in which said pivotal stop is positioned within the periphery of the door to permit the door to be filly closed and a filly extended position in which said pivotable stop extends beyond the door frame so as to be capable of engaging a portion of the fixed door frame to preclude fill closure of the door and wherein said pivotable stop is also rotationally positionable in an armed intermediate holding position between said unarmed deactivated position and the filly extended position, said pivotable stop also being extended beyond the periphery of the door when in said intermediate holding position; (c) rotary latch means positioned on and rotationally positionable relative to said pivotable stop in a first or transit position during movement of said pivotable stop from said unarmed deactivated position to said fully extended position, a second or latch ready cocked position for movement of said pivotable stop from said fully extended position to said intermediate holding position, a third or latching position for precluding movement of said pivotal stop from the intermediate holding position toward the unarmed deactivated closed position, a fourth or return enable position assumed in response to movement of said pivotal stop from the intermediate holding position to the fully extended open position and a fifth or return home position assumed for permitting movement of said pivotal stop from the intermediate holding position to the unarmed deactivated closed position; and (d) positioning means responsive to pivotal movement of said stop and a door opening movement followed by a partial door closure and a second door opening movement for sequentially positioning said rotary latch means in said first position, said second position, said third position, said fourth position and said fifth position.
- 2. A door closure prevention device as recited in claim 1, wherein said rotary latch means is mounted for rotation about a latch supporting pin having a supporting pin axis and which is mounted on said pivotable stop for pivotal movement about said stop pivot axis.
- 3. A door closure prevention device as recited in claim 2, wherein said rotary latch means is sequentially rotated on the latch supporting pin by said positioning means in a counter-clockwise direction for movement from said first position to said second position, from said second position to said third position, from said third position to said fourth position and from said fourth position to said fifth position.
- 4. A door closure prevention device as recited in claim 3, wherein said rotary latch means has a latch axis about which it is concentric and about which it is rotatable on said supporting pin axis.
- 5. A door closure prevention device as recited in claim 4, wherein said latch axis is mounted to move in an arcuate path about said stop pivot axis.
- 6. A door closure prevention device as recited in claim 5, wherein said positioning means includes first and second latch positioning cam surface engageable with said rotary latch for positioning said rotary latch in said second or latch ready cocked position, third and fourth latch positioning cam surface for positioning said rotary latch in said third or latching positioning.
- 7. A door closure prevention device as recited in claim 6, wherein said rotary latch means is an elongated plate having first and second side surfaces and first and second V-shaped end surfaces at opposite ends extending inwardly.
- 8. A door closure prevention device as recited in claim 7, wherein said elongated plate is of general rectangular configuration and is concentric with respect to an axis of rotation about which it rotates.
- 9. A door closure prevention device as recited in claim 8, wherein said elongated plate has a longitudinal axis extending through said axis of rotation and about which the periphery of said plate is concentric.
- 10. A door closure prevention device as recited in claim 9, wherein said V-shaped end surfaces are two rectangular surfaces intersecting at said longitudinal axis.
- 11. A door closure prevention device as recited in claim 10, wherein said stop pivot axis is perpendicular with respect to a vertical door hinge axis of said door.
- 12. A door closure prevention device as recited in claim 1, additionally including spring means urging said pivotal stop toward said unarmed deactivated position.
- 13. A door closure prevention device as recited in claim 12, wherein said rotary latch means is mounted for rotation about the axis of a latch supporting pin which is mounted on said pivotable stop for pivotal movement about said stop pivot shaft.
- 14. A door closure prevention device as recited in claim 13, wherein said latch means is an elongated plate having V-shaped end surfaces at opposite ends extending inwardly from each end between parallel side surfaces.
- 15. A door closure prevention device comprising:(a) a base means; (b) a pivotal stop mounted for forward or rearward pivotal movement on said base between a first or deactivated stop position and a second or extended activated stop position; (c) spring means urging said pivotal stop toward its deactivated position; (d) rotary latch means supported on said pivotal stop for rotational movement into plural rotary latch positions relative to said pivotal stop; (e) first, second, third and fourth cam surfaces on said base; (f) said first cam surface being positioned to engage said rotary latch means concurrently with forward movement of said pivotal stop from said first or deactivated stop position into said second or extended stop position to effect positioning of said rotary latch means in a second latch position from a first latch position relative to said pivotal stop; (g) said third and fourth cam surfaces being positioned to engage said rotary latch means in response to movement of said pivotal stop from said second or extended activated stop position to a third or intermediate partially extended stop position located between said first or deactivated stop position and said second or extended stop position for repositioning said rotary latch means from said second latch position into a third latch position in which said rotary latch precludes further movement of said pivotal stop toward said first or deactivated stop position; (h) wherein rearward movement of said pivotal stop from said third or intermediate partially extending position back to said second or extended activated stop position effects contact of said rotary latch means with said first cam surface which moves said rotary latch means from its third position to a fourth position in which said rotary latch means does not impede subsequent rearward movement of said pivotal stop from said second or extended activated stop position through said intermediate partially extended stop position but brings said rotary latch means into contact with said third cam surface which moves said rotary latch means from said fourth latch position to a fifth latch position in which said latch means remains as said pivotal stop returns to its first or deactivated stop position.
- 16. A door closure prevention device as recited in claim 15, wherein said rotary latch means is supported for rotation on a latch supporting pin extending from said pivotal stop.
- 17. A door closure device prevention device as recited in claim 15 additionally including a pivot shaft attached to said base means and supporting said pivotal stop and wherein said first, second, third and fourth cam surfaces are provided on latch control guide means held in a fixed position on said base means by said pivot shaft.
- 18. A method of controlling a pivotable door closure preventing stop mounted for pivotable movement on a door that mounted in a door frame and is biased toward a closed position by a door closure effecting device, said method comprising the steps of:(a) providing a continuous biasing force on said stop tending to position said stop in an unarmed deactivated position within the periphery of the door; (b) opening the door and manually pivoting said stop in an opening direction against said biasing force to an extended position in which said stop extends beyond the periphery of the door; (c) permitting said biasing force to return said stop in a closing direction to an armed intermediate position between said extended position and said unarmed deactivated in which the stop remains in an extended position beyond the periphery of the door; (d) positioning a latch in a latching position in response to steps (b) and (c) to prevent said stop from moving in a closing direction beyond said armed intermediate position; (e) permitting said door to move in a closing direction so that said stop engages the door frame to both prevent full door closure and to pivot said stop in said opening direction to said fully extended position in which said stop prevents further closing movement of the door; and (f) repositioning said latch from said latching position in response to step (e) so that subsequent opening movement of the door permits said biasing force to return the stop to said closed position so as to permit the door to close completely.
- 19. The method of claim 18, wherein the positioning of said latch as recited in (d) and (f) is effected by bodily moving said latch concurrently with the movement of said stop into contact with plural cam surfaces which first engage the latch and rotate the latch firstly into said latching position as recited in (d) and subsequently move the latch from said latching position as recited in (f).
- 20. The method of claim 19, wherein the bodily movement of said latch is effected by pivotal movement about a pivot axis about which said stop also pivots.
US Referenced Citations (20)
Foreign Referenced Citations (1)
Number |
Date |
Country |
2058204 |
Jul 1979 |
GB |