Information
-
Patent Grant
-
6253824
-
Patent Number
6,253,824
-
Date Filed
Tuesday, February 23, 199925 years ago
-
Date Issued
Tuesday, July 3, 200123 years ago
-
Inventors
-
Original Assignees
-
Examiners
Agents
- Renner, Kenner, Greive, Bobak, Taylor & Weber
-
CPC
-
US Classifications
Field of Search
US
- 160 188
- 160 189
- 160 201
- 160 191
- 160 192
- 160 190
- 160 310
- 192 8927
- 192 697
- 192 101
- 192 995
- 049 139
- 074 625
-
International Classifications
-
Abstract
An operator (10) for moving in upward and downward directions a sectional door (D) having a counterbalancing system (30) including a drive tube (31) interconnected with the door including, a reversible motor (40), a drive shaft (50) selectively driven in two directions by the motor, a drive gear (61) freely rotatably mounted on the drive shaft, a driven gear (65) mounted on the drive tube and operatively engaging the drive gear, a disconnect assembly (70) having a spool (71) rotatable with the drive shaft and movable into and out of engagement with the drive gear for selectively connecting and disconnecting the motor and the drive tube, and an actuating mechanism (80) normally maintaining said spool in engagement with the drive gear and biasing the spool out of engagement with the drive gear when released to permit independent movement of the door.
Description
TECHNICAL FIELD
The present invention relates generally to motorized operators for sectional doors. More particularly, the present invention relates to jack-shaft operators employed for the powered operation of sectional doors. More specifically, the present invention relates to a disconnect for selectively connecting and disconnecting a jack-shaft operator to a counterbalance system connected to and adapted to operatively position a sectional overhead door.
BACKGROUND ART
Motorized apparatus for opening and closing sectional overhead doors has long been known in the art. These powered door operators were developed in part due to extremely large, heavy commercial doors for industrial buildings, warehouses, and the like where the opening and closing of the doors essentially mandated power assistance. Eventually, homeowner demands for the convenience and safety of door operators, particularly when remote actuation became readily feasible, resulted in an extremely large market for powered door operators for residential applications.
The vast majority of motorized operators for residential garage door applications employ a trolley-type system extending perpendicular to the door header into the garage to apply force to a section, normally the upper section, of the door for powering between the open and closed positions. Another type of motorized operator is known as a “jack-shaft” operator, which is used extensively in commercial applications and is so named by virtue of similarities with transmission devices where the power or drive shaft is parallel to the driven shaft, with the transfer of power occurring mechanically as by gears, belts, or chains interconnecting the drive shaft and a driven shaft, which controls the position of a door.
The extensively employed door operators that connect directly to the garage door, principally the trolley-type systems, traditionally have a manual disconnect that at any time disconnects the operator from its mechanical interconnection with the door. These disconnects are usually incorporated into the trolley portion of the operator in such a fashion that when disconnected, the door is free to be manually moved in either the open or closed direction. This type of disconnect for trolley-type operators permit a person to isolate the arm interconnecting the door and the trolley in the event the operator or the door malfunctions, there is a loss of power to the operator, or the door entraps a person or object. A disconnect of this general type has been a mandatory requirement for trolley-type garage door operators for a number of years.
The disconnect handle on trolley-type operators is normally attached to a rope that is suspended from, and moves with, the trolley as the operator opens and closes the garage door. There are industry requirements that a handle be at the bottom of the rope suspended from the trolley and be suspended no more than six feet from the floor so that it is available to be grasped by a person and pulled to effect disconnect in the event of an emergency.
These positioning requirements coupled with the basic characteristics of a trolley-type system create serious disadvantages in some operating conditions. The fact that the rope and disconnect handle move with the trolley may undesirably make it difficult to locate the handle at night or in a dark garage when there is a power failure. In addition, the movement of the rope suspended handle into and out of the garage during opening and closing of the door can result in the handle dragging across the top of high vehicles and even becoming entangled in a luggage rack or other appurtenances that may be roof-mounted on vans or sports utility vehicles. It is also to be observed that when a garage door is closed, the disconnect rope and handle are in the closest proximity to the garage door. When the door has windows positioned in the top section of the door, as is customary, the security of the garage in regard to breaking and entering is seriously compromised. In such instance, if the center window pane is broken, the disconnect handle is within easy reach for an intruder to disconnect the door from the operator and subsequently manually open the door to the garage.
Most of the commercially-employed disconnects for trolley-type operators are weighted or spring-loaded toward the connected position, such that these biasing forces must be overcome to disengage the disconnect so the door can be moved independent of the trolley. This biasing allows the disconnect to automatically re-engage when the door is manually moved to the precise position where disengagement was effected by the disconnect. In some instances, disconnects automatically engage when the trolley is moved by the operator motor to the appropriate position for a current door location. While automatic engaging features are sometimes considered to be advantageous, in other instances a disconnect that engages only when a positive manual action, such as moving a handle or lever, is taken is preferred. While it is generally conceded to be highly advantageous to engage a disconnect at any location of the door and operator without adjusting the position of either, such an operational format is not possible with current trolley-type operator designs.
In relation to jack-shaft operators, the operator units are normally mounted on the side of the door outwardly of the rails, which can produce clearance problems in the instance of minimal clearance between a garage side wall and the rails for the door rollers. Whether of a vertical open position type door as is employed in commercial installations where there is substantial building height or a horizontal open position type door, as is necessary for most residential installations, disconnection of the motor and the door is normally effected by a rope and handle suspended either from the operator unit or by a lever or actuating arm located on the operator. In residential applications where there are top section windows, such disconnects are subject to forced entry by breaking an end window and merely pulling the disconnect handle or the disconnect lever. In instances where a jack-shaft operator may be mounted above the door, a serious operational deficiency is encountered in efforts to effect disconnect when the door is at an intermediate position because the portion of the door extending horizontally into the garage renders the operator and its disconnect mechanism above the door inaccessible in virtually all instances, except when the door is in the fully closed position. Thus, existing disconnects suffer from one or more disadvantageous characteristics.
DISCLOSURE OF THE INVENTION
Therefore, an object of the present invention is to provide a motorized operator for a sectional door that is a type of jack-shaft operator with a mechanical disconnect. Another object of the present invention is to provide such a motorized operator which does not mechanically disconnect the operator from the door but rather, separates the motor drive for the operator from the door counterbalance system. A further object of the present invention is to provide such a motorized operator that does not have a moving disconnect handle that travels with the door, does not directly mechanically interconnect to the door, and otherwise eliminates various disadvantageous operational characteristics common to trolley-type operators.
Another object of the present invention is to provide a motorized operator for sectional doors that does not require pulling a cable to effect mechanical disconnection, such that a person seeking to achieve unauthorized entry as through a broken glass pane in the door cannot achieve entry by merely pulling an accessible cable. A still further object of the invention is to provide such a mechanical disconnect wherein pulling or further tensioning of the actuating cable of the disconnect mechanism serves to reinforce the engagement of the disconnect in the operating position, thereby precluding unauthorized entry. Yet a further object of the invention is to provide such a motorized operator wherein the cable-mounted handle actuating the disconnect may be remotely placed and requires release of the handle from a retaining bracket to achieve the disconnect function.
Still another object of the present invention is to provide a motorized operator for sectional doors that requires only the pulling of a cable-suspended handle to connect the manual disconnect for normal motorized operation of the door. Still another object of the present invention is to provide such a motorized operator that does not require returning the door to the position at which the disconnect was disengaged to effect re-engagement in that re-engagement may be accomplished at any position of the door. Yet another object of the invention is to provide such a motorized operator that will not automatically re-engage once it is disengaged without pulling actuation of an operator handle and effecting tensioned positioning on a retaining bracket.
A further object of the present invention is to provide a motorized operator for sectional doors that can be quickly and easily installed and has a disconnect assembly that may be quickly and easily positioned, which requires few adjustments and is operatively sufficiently simple, such as to provide a high degree of reliability. Still a further object of the invention is to provide such a motorized operator that is designed to be installed such that it does not require additional headroom above a torsion spring counterbalance system mounted relative to the door or outside of the vertical tracks, except for the remote mounting of an operator disconnect handle and retaining bracket, which may be advantageously intentionally displaced a distance from the door.
In general, the present invention contemplates an operator for moving in upward and downward directions a sectional door having a counterbalancing system including, a drive tube interconnected with the door including, a reversible motor, a drive shaft selectively driven in two directions by the motor, a drive gear freely rotatably mounted on the drive shaft, a driven gear mounted on the drive tube and operatively engaging the drive gear, a disconnect assembly having a spool rotatable with the drive shaft and moveable into and out of engagement with the drive gear for selectively connecting and disconnecting the motor and the drive tube, and an actuating mechanism normally maintaining the spool in engagement with the drive gear and biasing the spool out of engagement with the drive gear when released to permit independent movement of the door.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1
is a fragmentary rear perspective view of a sectional overhead garage door installation having a torsional counterbalancing system connected to the door and to a motorized operator with a disconnect assembly according to the concepts of the present invention.
FIG. 2
is a fragmentary rear elevational view of the door, counterbalancing system, and motorized operator of
FIG. 1
with a portion of the operator housing broken away to show the interconnection between the operator and the counterbalancing system and details of the disconnect assembly in its normal operating position with the operator driving the door.
FIG. 3
is a fragmentary rear elevational view similar to
FIG. 3
showing the disconnect assembly in its disengaged position for movement of the door independent of the operator.
FIG. 4
is an enlarged exploded perspective view taken in the direction of
FIG. 1
showing details of the operating parts of the operator and particularly the disconnect assembly.
FIG. 5
is an enlarged exploded perspective view similar to
FIG. 4
taken from a position proximate the other end of the door and showing further details of the operating parts of the operator and particularly the disconnect assembly.
PREFERRED EMBODIMENT FOR CARRYING OUT THE INVENTION
A motorized operator according to the concepts of the present invention is generally indicated by the numeral
10
in the drawing figures. The motorized operator
10
is shown mounted in conjunction with a conventional sectional door D of a type commonly employed in garages for residential housing, as seen particularly in
FIGS. 1-3
. The opening in which the door D is positioned for opening and closing movements relative thereto is conventionally defined by a frame, generally indicated by the numeral
12
, which consists of spaced jambs
13
that are generally parallel and extend vertically upward from a garage floor. The jambs
13
are spaced and joined at their vertically upper extremity by a header
15
to thereby delineate a generally inverted U-shaped frame
12
around the opening for the door D. The frame
12
is normally constructed of lumber, as is well known to persons skilled in the art, for purposes of reinforcement and facilitating the attachment of elements supporting and controlling door D, including the motorized operator
10
.
Affixed to the jambs
13
proximate the upper extremities thereof and the lateral extremities of the header
15
to either side of the door D are flag angles, generally indicated by the numeral
20
. The flag angles
20
generally consist of L-shaped members
21
having a leg
22
attached to an underlying jamb
13
and a projecting leg
23
preferably disposed substantially perpendicular to the leg
22
and, therefore, perpendicular to the jambs
13
.
Flag angles
20
also include an angle iron
25
positioned in supporting relation to tracks T located to either side of the door D. The tracks T provide a guide system for rollers attached to the sides of door D in a manner well known to persons skilled in the art. The angle irons
25
normally extend substantially perpendicular to the jambs
13
and may be attached to the transitional portion of tracks T between the vertical section and horizontal section thereof or at the commencement of the horizontal section of tracks T. In conventional fashion, the tracks T define the travel of the door D in moving upwardly from the closed vertical position to the open horizontal position and downwardly from the open horizontal position to the closed vertical position.
The motorized operator
10
mechanically interrelates with the door D through a counterbalance system, generally indicated by the numeral
30
. As shown, the counterbalance system
30
includes an elongate drive tube
31
extending between tensioning assemblies
32
positioned proximate each of the flag angles
20
. While the counterbalance system
30
depicted herein is advantageously in accordance with that disclosed in Applicants' assignee's U.S. Pat. No. 5,419,010, it will be appreciated by persons skilled in the art that motorized operator
10
could be employed with a variety of torsion spring counterbalance systems. In any instance, the counterbalance system
30
includes cable drum mechanisms
33
positioned on the drive tube
31
proximate the ends thereof, which rotate with the drive tube
31
.
The cable drum mechanisms
33
each have a cable C reeved thereabout which extend downwardly and are affixed to the door D, preferably proximate the bottom, such that rotation of the cable drum mechanisms
33
operates to open and close the door D in accordance with conventional practice. While drive tube
31
is a hollow, tubular member that is non-circular in cross-section, it is to be appreciated that circular drive tubes, solid shafts, and other types of driving elements that rotate cable drums, such as cable drum mechanisms
33
, may be employed in conjunction with the motorized operator
10
of the invention and are encompassed within this terminology in the context of this specification.
As seen in the drawing figures, the motorized operator
10
has an operator housing
35
encompassing a portion of the operative components. The operator housing
35
is attached to the header
15
as by a plurality of cap screws (not shown). As seen in
FIGS. 1-3
, the drive tube
31
of counterbalance system
30
extends through a portion of the housing
35
. It is to be appreciated that the motorized operator
10
, with the depicted counterbalance system
30
, while normally mounted medially of drive tube
31
between cable drum mechanisms
33
, could be mounted at any desired location along drive tube
31
should it be necessary or desirable to avoid an overhead or wall obstruction in a particular garage design.
The motorized operator
10
has an operator motor, generally indicated by the numeral
40
. The operator motor
40
may be a conventional electric motor that is designed for stop, forward, and reverse rotation of a motor shaft
41
(see FIG.
5
). As shown, the motor
40
and motor shaft
41
are in close proximity to drive tube
31
and have their center lines oriented in parallel relation thereto, such as to provide a compact configuration within the operator housing
35
and to simplify interconnection therebetween in the manner described hereinafter. It is to be noted that the operator housing
35
and all components thereof are positioned below the drive tube
31
, except for the small portion of housing
35
that encompasses the drive tube
31
. As a result, the entire motorized operator
10
essentially resides below and within the envelope defined by the counterbalance system
30
and the tracks T.
In order to provide an operator motor
40
of minimal dimensions and enhanced power output, and to achieve other efficiencies, the operator motor
40
is coupled to a gear reducer
45
. The gear reducer
45
has a generally cylindrical housing
46
that is attached to the operator motor
40
in operative relation thereto. The gear reducer
45
is provided with suitable conventional planetary gear arrangements of one or multiple stages to achieve the power and rotational speed requirements for actuating counterbalance system
30
. The output of the gear reducer
45
is by way of a drive shaft
50
(see FIGS.
4
and
5
), which extends from gear reducer
45
in the direction opposite the operator motor
40
. The drive shaft
50
has a hexagonal shaft section, or other non-circular cross section,
51
proximate to the gear reducer
45
and a cylindrical shaft section
52
extending outwardly of the hexagonal shaft section
51
. The extremity of drive shaft
50
, and particularly cylindrical shaft section
52
, is freely rotatably supported in a cylindrical bearing surface
53
formed in the operator housing
35
.
Motorized operator
10
is interconnected with counterbalance system
30
and particularly the drive tube
31
thereof by a gear train, generally indicated by the numeral
60
. The gear train
60
includes a drive gear
61
which is freely, rotatably mounted on the cylindrical shaft section
52
of drive shaft
50
. The drive gear
61
preferably has a pair of axially spaced spur gears
62
and
63
disposed about the circumferential periphery thereof. The gear train
60
further includes a driven gear
65
that is non-relatively rotatably affixed to the drive tube
31
of the counterbalance system
30
. The driven gear
65
has a pair of axially spaced circumferentially continuous spur gears
66
and
67
(see
FIGS. 2-3
) that matingly engage the spur gears
62
and
63
, respectively, of the drive gear
61
.
It will thus be appreciated that rotation of drive gear
61
of gear train
60
will result in angularly opposite rotation of the driven gear
65
and thus the drive tube
31
of counterbalance system
30
to effect raising and lowering of the door D. In order to protect gear train
60
from dirt or other foreign matter or interference by foreign objects, the operator housing
35
may be provided with a cylindrical extension
36
which encloses the driven gear
65
of the gear train
60
.
The drive shaft
50
of motorized operator
10
interrelates with the gear train
60
by way of a disconnect assembly, generally indicated by the numeral
70
, as best seen in
FIGS. 4 and 5
. The disconnect assembly
70
is mounted in operative relation to the drive shaft
50
within operator housing
35
between the gear train
60
and the gear reducer
45
.
The disconnect assembly
70
includes a cylindrical spool, generally indicated by the numeral
71
. The spool
71
has a central cylindrical recess
72
bounded on one axial extremity by a substantially planar flange
73
and on the other axial extremity by a somewhat arcuate flange
74
. The arcuate flange
74
has axially outwardly projecting circumferential teeth
75
which extend in the direction opposite the cylindrical recess
72
. The spool
71
has a central through aperture
76
that is sized and configured to matingly engage the hex shaft section
51
, or other non-circular cross section, of the drive shaft
50
. The aperture
76
is sized and configured in such a manner as to be mounted for rotation with the drive shaft
50
throughout the range of movement of spool
71
along drive shaft
50
.
The teeth
75
of arcuate flange
74
of spool
71
are spaced radially outwardly on flange
74
a sufficient distance to lie radially outwardly of a hub
68
of the drive gear
61
which freely rotatably mounts the drive gear
61
on the cylindrical shaft section
52
of drive shaft
50
. The teeth
75
are adapted to fit within drive gear
61
and interengage with a plurality of circumferentially spaced splines
69
within the drive gear
61
. It will be appreciated that when the spool
71
is in contact with drive gear
61
such that the splines
69
interfit between the teeth
75
of spool
71
, the drive gear
61
will rotate with the spool
71
as dictated by the drive shaft
50
. A compression spring
77
positioned on drive shaft
50
biasingly engages flange
73
to maintain teeth
75
of spool
71
in operative engagement with splines
69
of drive gear
61
.
The positioning of the spool
71
of disconnect assembly
70
is effected by an actuating mechanism, generally indicated by the numeral
80
. The actuating mechanism
80
includes a yoke, generally indicated by the numeral
81
, which is best seen in
FIGS. 4 and 5
of the drawings. The yoke
81
interfits with and operatively positions the spool
71
of the disconnect assembly. In particular, the yoke
81
has a pair of parallel arms
82
and
83
which are joined by a crossbar
84
to form a U-shaped member that fits within the cylindrical recess
72
of spool
71
. The arms
82
,
83
and crossbar
84
operatively engage the flanges
73
and
74
of the spool
71
to move the spool
71
axially along the hexagonal shaft section
51
of drive shaft
50
to position the spool
71
relative to the drive gear
61
.
There is, however, a significant clearance between the yoke
81
and the flanges
73
,
74
of spool
71
to permit supplemental movement of the spool
71
independent of the yoke
81
for a purpose hereinafter described. The actuation of spool
71
by yoke
81
is effected by the pivotal mounting of yoke
81
within the operator housing
35
. The pivotal mounting of the yoke
81
is effected by stub shafts
85
and
85
′ that extend from the extremities of the arms
82
and
83
, respectively, opposite the crossbar
84
. The stub shaft
85
has a boss
86
that seats in a bearing protrusion
37
in operator housing
35
, which has a bore
38
through which the stub shaft
85
protrudes outwardly of the operator housing
35
. The stub shaft
85
′ is mounted in a bearing surface (not shown) in the operator housing
35
such as to orient the yoke
81
for pivotal motion in a plurality of planes substantially perpendicular to drive shaft
50
while remaining within the cylindrical recess
72
between the flanges
73
,
74
of spool
71
.
The selective pivoting of yoke
81
to position spool
71
is effected by a control arm
90
. The control arm
90
has an elongate slot
91
that receives diametrically opposed projections
87
on the stub shaft
85
to thus non-rotatably affix control arm
90
to the yoke
81
. A screw
92
, or other appropriate fastener, threads into the end of stub shaft
85
to maintain control arm
90
positioned thereon and thus maintain yoke
81
in position axially of the stub shafts
85
,
85
′. The control arm
90
is biased counterclockwise to the position depicted in
FIG. 3
of the drawings by a tension spring
93
. The tension spring
93
has a hook
94
at one end thereof, which engages an aperture
95
in control arm
90
, and a hook
96
that is attached to a hole (not shown) or is otherwise secured in the operator housing
35
.
Countering the force supplied by tension spring
93
, the control arm
90
has a control cable
100
extending from control arm
90
in the direction opposite the tension spring
93
. As shown, the cable
100
has a loop
101
formed at the extremity thereof by a an attached cable clamp
102
. An S-hook
103
connects the loop
101
to the aperture
95
at the lower extremity of the control arm
90
. An in-tuned tab
105
on control arm
90
engages a stop
39
formed in the operator housing
35
to limit clockwise rotation of the control arm
90
, as viewed in
FIGS. 2 and 3
of the drawings.
In order to provide for operation of the actuating mechanism
80
when the door D is in a partially open condition and to displace the operating station from a position above the door D to the side of door D or other remote location, the cable
100
extends to a control station, generally indicated by the numeral
110
, as seen in
FIGS. 1 and 2
. As shown, the cable
100
extends through an aperture
106
in the end cap
107
of the operator housing
35
and along the header
15
above the door D. Thereafter, cable
100
may be directed through a bushing
108
in the flag angle
20
and diverted downwardly to the control station
110
. The cable
100
terminates in a permanently affixed operator handle at the control station
110
. An L-shaped retaining bracket
112
selectively secures and releases the operator handle
111
. The retaining bracket
112
has a vertical leg
113
, which may be attached to frame
12
of the door D, as best seen in
FIG. 1. A
horizontal leg
114
of the retaining bracket
112
has a slot
115
for receiving the cable
100
and achieving elective retention and release of the cable
100
, as seen in FIG.
2
and
FIG. 3
, respectively.
In the normal operation of motor operator
10
, the cable
100
is tensioned by retention of operator handle
111
in the retaining bracket
112
, as seen in
FIG. 2
of the drawings. In this position, the control arm
90
is at the limit of its clockwise travel, with the tab
105
being in engagement with stop
39
of operator housing
35
. The spool
71
of disconnect assembly
70
is maintained with the teeth
75
in operative engagement with splines
69
of drive gear
61
due to the biasing force provided by compression spring
77
. The drive tube
31
of counterbalance system
30
is thus selectively directionally rotated and stopped by the gear train
60
, as actuated by operator motor
40
, based upon motor control signals, which are supplied to operator motor
40
in a conventional manner. Depending upon design considerations, it may be necessary or desirable to provide motor control signals which reverse the motor for a short interval when the door D is stopped during closing. This reversal reduces torsional loading that may otherwise exist between the spool
71
and the drive gear
61
to facilitate the axial separation of these elements in the event of subsequent operation of disconnect assembly
70
.
In the event the door D encounters an obstruction or power is lost to the operator motor
40
, the door D may be disconnected from the operator
10
for independent manual movement by actuation of disconnect assembly
70
, as controlled by its actuating mechanism
80
. This action is initiated by releasing the operator handle
111
from the retaining bracket
112
to free the cable
100
, such that the tension spring
93
of the actuating mechanism
80
moves the control arm
90
to the disengaged position depicted in
FIG. 3
of the drawings. This, in turn, pivots the yoke
81
to move the spool
71
, and particularly the teeth
75
, out of engagement with the drive gear
61
, while at the same time compressing the spring
77
. In this respect, it is significant to note that the characteristics of spring
93
and spring
77
must be designed so that spring
77
has a lesser spring rate and is thus overcome by the force developed by spring
93
to effect the requisite compression of spring
77
. It is significant to note that once handle
111
is released, the disconnect assembly
70
remains in the position with spool
71
disengaged from drive gear
61
, without the necessity for manually maintaining tension on the cable
100
via the handle
111
. Therefore, this condition of motorized operator
10
is automatically maintained, and the door D may be manually manipulated as necessary by a person who has released the operator handle
111
.
Once an obstruction is cleared, power is resumed to motor
40
, or it is otherwise desired to connect the door D to motorized operator
10
, normal operation may be resumed with the door D at any position by merely grasping the operator handle
111
in the
FIG. 3
position and tensioning the cable
100
by pulling downwardly and inserting the cable
100
in the slot
115
of horizontal leg
114
of retaining bracket
112
. This selective tensioning of cable
100
returns control arm
90
to the
FIG. 2
position, where the tab
105
engages the stop
39
, which again tensions the spring
93
. The yoke
81
of actuating mechanism
80
rotates with the control arm
90
to move the spool
71
of disconnect assembly
70
, such that teeth
75
are in close proximity to, but not in engagement with, the splines
69
of drive gear
61
of gear train
60
. At that position, sufficient clearance is present between the yoke
81
and the flanges
73
,
74
of spool
71
, such that the spring
77
moves the spool
71
further axially of drive shaft
50
so that the teeth
75
of spool
71
move into mating engagement with the splines
69
of drive gear
61
. With the spring
77
providing the force effecting engagement of teeth
75
of spool
71
with spline
69
of drive gear
61
rather than the tensioning force of the cable
100
, there is a reduced engaging force that minimizes wear or damage to teeth
75
and/or splines
69
during the mating engagement thereof. Once engaged, the spring
77
maintains the spool
71
in the engaged position, as previously indicated.
Thus, it should be evident that the disconnect for powered sectional doors disclosed herein carries out one or more of the objects of the present invention set forth above and otherwise constitutes an advantageous contribution to the art. As will be apparent to persons skilled in the art, modifications can be made to the preferred embodiments disclosed herein without departing from the spirit of the invention, the scope of the invention herein being limited solely by the scope of the attached claims.
Claims
- 1. An operator system for moving in upward and downward directions a sectional door comprising, a door, a counterbalancing system including a drive tube interconnected with said door, a reversible motor, a drive shaft selectively driven in two directions by said motor, a drive gear freely rotatably mounted on said drive shaft, a driven gear mounted on said drive tube and operatively engaging said drive gear, a disconnect assembly having a spool rotatable with said drive shaft and movable into and out of engagement with said drive gear for selectively connecting and disconnecting said motor and said drive tube, and an actuating mechanism maintaining said spool normally biased into engagement with said drive gear and biasing said spool out of engagement with said drive gear when released to permit independent movement of said door.
- 2. An operator according to claim 1, wherein said spool of said disconnect assembly has teeth for selectively interengaging splines on said drive gear.
- 3. An operator according to claim 2, wherein said gear teeth on said spool project substantially axially outwardly from a flange.
- 4. An operator according to claim 1, wherein said actuator mechanism includes a pivotally mounted yoke engaging a recess in said spool, wherein selective pivotal movement of said yoke moves said spool axially along said drive shaft relative to said drive gear.
- 5. An operator according to claim 4, wherein a spring biases said spool into driving engagement with said drive gear.
- 6. An operator according to claim 5, wherein said spring is a compression spring mounted on said drive shaft and engaging said spool.
- 7. An operator according to claim 4, wherein said actuator mechanism includes a control arm nonrotatably affixed to said yoke.
- 8. An operator according to claim 1, wherein said actuating mechanism has a spring biasing said spool out of engagement with said drive gear.
- 9. An operator according to claim 7, wherein said spring is a tension spring.
- 10. An operator according to claim 1, wherein said disconnect assembly includes a first spring for biasing said spool into engagement with said drive gear and said actuating mechanism has a yoke for moving said spool between a position proximate to said drive gear and a position out of engagement with said drive gear and a second spring biasing said spool out of engagement with said drive gear.
- 11. An operator according to claim 10, wherein said first spring has a lesser spring rate than said second spring.
- 12. An operator according to claim 10, wherein said yoke has a control arm which is connected by a cable to a control station which normally tensions said cable to maintain said spool in engagement with said drive gear and which permits said second spring to bias said spool out of engagement with said drive gear when tension on said cable is released at said control station.
- 13. An operator according to claim 12, wherein said second spring is attached to said control arm.
- 14. An operator according to claim 12, wherein said control arm has a tab that engages a stop when said spool is moved to said position proximate to said drive gear.
- 15. An operator system for moving in upward and downward directions a sectional door comprising, a door, a counterbalancing system including a drive tube interconnected with said door, a reversible motor, a drive shaft selectively driven in two directions by said motor, a drive gear freely rotatably mounted on said drive shaft, a driven gear mounted on said drive tube and operatively engaging said drive gear, disconnect means having a spool rotatable with said drive shaft and movable into and out of engagement with said drive gear for selectively connecting and disconnecting said motor and said drive tube, and actuating means normally maintaining said spool in engagement with said drive gear and biasing said spool out of engagement with said drive gear when released to permit independent movement of the door.
- 16. An operator according to claim 15, wherein said disconnect means includes a spool having teeth for selectively interengaging splines on said drive gear.
- 17. An operator according to claim 16, wherein said disconnect means includes a first spring for biasing said spool into engagement with said drive gear and said actuating means has a yoke for moving said spool between a position proximate to said drive gear and a position out of engagement with said drive gear and a second spring biasing said spool out of engagement with said drive gear.
- 18. An operator according to claim 17, wherein said yoke has a control arm which is connected by a cable to a control station which normally tensions said cable to maintain said spool in engagement with drive gear and which permits said second spring to bias said spool out of engagement with said drive gear when tension on said cable is released at said control station.
- 19. An operator system for moving a sectional door in upward and downward directions comprising, a door, a counterbalancing system including a drive tube interconnected with said door, a motor, a drive shaft selectively driven in two directions by said motor, a drive gear freely rotatably mounted on said drive shaft, a driven gear mounted on said drive tube and operatively engaging said drive gear, a disconnect having a spool rotatable with said drive shaft and movable into and out of engagement with said drive gear for selectively connecting and disconnecting said motor and said drive tube, and an actuator normally maintaining said spool in engagement with said drive gear and biasing said spool out of engagement with said drive gear when released to permit independent movement of said door.
- 20. An operator according to claim 19, wherein said disconnect comprises a spool having teeth for selectively interengaging said drive gear.
- 21. An operator according to claim 19, wherein said actuator includes a pivotally mounted yoke engaging a recess in said spool, wherein selective pivotal movement of said yoke moves said spool axially along said drive shaft relative to said drive gear.
- 22. An operator according to claim 19, wherein said disconnect includes a first spring for biasing said spool into engagement with said drive gear and said actuator has a yoke for moving said spool between a position proximate to said drive gear and a position out of engagement with said drive gear and a second spring biasing said spool out of engagement with said drive gear.
- 23. An operator according to claim 19, wherein said actuator includes a cable which is tensioned to maintain said spool in engagement with said drive gear, whereby further tensioning of said cable reinforces the engagement of said spool with said drive gear.
- 24. An operator according to claim 19, wherein a motor control signal is provided to said motor to reverse said motor for a short interval when the door is stopped during closing, thereby reducing torsional loading between said spool and said drive gear to facilitate separation of said spool from said drive gear during release of said actuator.
US Referenced Citations (24)
Foreign Referenced Citations (1)
Number |
Date |
Country |
WO 9904124 |
Jan 1999 |
WO |