U.S. patent number 3,592,240 [Application Number 04/771,835] was granted by the patent office on 1971-07-13 for damper unit for controlling air flow.
This patent grant is currently assigned to Allied Thermal Corporation. Invention is credited to Warren R. Hedrick, Henry J. Meurer.
United States Patent |
3,592,240 |
Hedrick , et al. |
July 13, 1971 |
DAMPER UNIT FOR CONTROLLING AIR FLOW
Abstract
A damper unit for controlling air flow by adjustment of a pair
of pivotally mounted damper blades. Adjustment of the blades is
accomplished by linear movement of an operating member pivotally
connected to the blades and actuated by the rotation of a worm. The
worm has a noncircular opening there-through to receive a rod of
similar cross section. The rod is frictionally, but movably, held
in the opening through the worm for adjustment lengthwise thereof
to accommodate louvered face plates of various heights.
Inventors: |
Hedrick; Warren R. (Holland,
MI), Meurer; Henry J. (Holland, MI) |
Assignee: |
Allied Thermal Corporation (New
Britain, CT)
|
Family
ID: |
25093092 |
Appl.
No.: |
04/771,835 |
Filed: |
October 30, 1968 |
Current U.S.
Class: |
137/316; 251/212;
251/292; 137/601.05 |
Current CPC
Class: |
F24F
13/16 (20130101); F24F 13/1413 (20130101); F24F
13/06 (20130101); F24F 13/1426 (20130101); F16K
1/223 (20130101); F16L 55/04 (20130101); Y10T
137/87442 (20150401); Y10T 137/6116 (20150401) |
Current International
Class: |
F24F
13/14 (20060101); F24F 13/06 (20060101); F24F
13/16 (20060101); F16L 55/04 (20060101); F24F
13/10 (20060101); F16K 1/22 (20060101); F16l
013/00 () |
Field of
Search: |
;137/601
;98/41,85,106,111--113 ;251/291,292,212 ;137/316 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Nilson; Robert G.
Claims
The invention we claim is as follows:
1. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof upwardly toward
each other to open position and downwardly away from each other to
closed position, the improvement which comprises
a. a substantially U-shaped bracket mounted on the underside of
said support,
b. a worm extending downwardly from said support and mounted for
rotation at the upper end thereof in said support and at the lower
end thereof in said bracket,
c. an operating member below said blades and engaging at least one
of the teeth on said worm and adapted to move axially thereof when
said worm is rotated, and
d. means connecting said damper blades with said operating member
and with said support, whereby rotation of said worm will cause
said operating member to move axially of said worm, thereby to move
said damper blades toward or away from each other.
2. A damper unit as defined in claim 1, wherein said worm is formed
of a corrosion resistant plastic material and has a noncircular
opening extending axially thereof, an elongated rod having a
cross-sectional configuration similar to that of said noncircular
opening, and a clip on said bracket, said rod being adapted to be
securely held in place by said clip while the damper unit is in
storage or being shipped and to be removed therefrom and then
frictionally held in the noncircular opening of said worm during
installation of the unit, whereby rotation of said rod will rotate
said worm to move said damper blades.
3. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof upwardly toward
each other to open position and downwardly away from each other to
closed position, the improvement which comprises:
a. a worm rotatably mounted on the support and extending downwardly
therefrom,
b. an operating member below said blades and engaging at least one
of the teeth on said worm and adapted to move axially thereof when
said worm is rotated,
c. means connecting said damper blades with said operating member
and with the support, whereby rotation of said worm will cause said
operating member to move axially of said worm, thereby to move said
damper blades toward or away from each other, and
d. a noncircular opening extending axially through the entire
length of said worm for the reception of an elongated rod having a
cross-sectional configuration similar to that of said noncircular
opening, whereby rotation of the rod will rotate said worm to move
said damper blades, and the rod may be moved upwardly through said
opening for storage purposes.
4. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof upwardly toward
each other to open position and downwardly away from each other to
closed position, the improvement which comprises:
a. A worm rotatably mounted on the support and extending downwardly
therefrom,
b. an operating member below said blades and engaging at least one
of the teeth on said worm and adapted to move axially thereof when
said worm is rotated,
c. means connecting said damper blades with said operating member
and with the support, whereby rotation of said worm will cause said
operating member to move axially of said worm, thereby to move said
damper blades toward or away from each other, and
d. an elongated member extending from said support member toward
said operating member, a stop member adjustable to selected
positions along the length of said elongated member in the path of
movement of said operating member, thereby to limit movement of
said operating member in one direction, and movement of said damper
blades toward each other.
5. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof upwardly toward
each other to open position and downwardly away from each other to
closed position, the improvement which comprises:
a. a worm rotatably mounted on the support and extending downwardly
therefrom,
b. an operating member including a relatively flat strip extending
transversely of said support below said blades, and engaging at
least one of the teeth on said worm and adapted to move axially
thereof when said worm is rotated,
c. means including two arms, one on each side of said support and
rigidly secured thereto, extending from said strip upwardly toward
said damper blades, for connecting said damper blades with said
operating member and with the support, whereby rotation of said
worm will cause said operating member to move axially of said worm,
thereby to move said damper blades toward or away from each other,
and
d. pivot means connecting each said worm with one of said damper
blades.
6. A damper unit as defined in claim 5, wherein each said pivot
means includes a pin and slot connection.
7. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof toward each other
to open position and away from each other to closed position, the
improvement which comprises
a. a worm formed of a corrosion resistant plastic material mounted
on the support and extending therefrom in a direction away from the
direction in which the blades move toward open position,
b. an operating member engaging at least one of the teeth on said
worm and movable axially thereof when said worm is rotated,
c. means connecting said damper blades with said operating member
and with the support, whereby rotation of said worm will cause said
operating member to move axially of said worm, thereby to move said
damper blades toward or away from each other,
d. a noncircular opening extending axially through said worm,
and
e. a rod having a cross-sectional configuration similar to that of
said noncircular opening and received therein, whereby rotation of
said rod will rotate said worm and operate said damper blades, said
rod being frictionally held in said worm, but movable to selected
positions axially thereof, whereby it is adapted to be used with
various heights of louvered faces mounted on said frame member.
8. A damper unit as defined in claim 7 wherein said rod is also
formed of a corrosion resistant plastic material.
9. In a damper unit for regulating air flow and having a frame
member with an opening therethrough for the passage of air, a
support extending transversely of the frame member and secured
thereto, a pair of opposed damper blades mounted for generally
pivotal movement about the adjacent edges thereof upwardly toward
each other to open position and downwardly away from each other to
closed position, the improvement which comprises:
a. a worm rotatably mounted on the support and extending downwardly
therefrom,
b. an operating member below said blades and engaging at least one
of the teeth on said worm and adapted to move axially thereof when
said worm is rotated,
c. means connecting said damper blades with said operating member
and with the support, whereby rotation of said worm will cause said
operating member to move axially of said worm, thereby to move said
damper blades toward or away from each other, and
d. the means connecting said damper blades with the support
including a pair of ears extending outwardly from each said blade
adjacent the support, an opening through each of said ears, and a
pair of pin members extending outwardly from opposite sides of the
support, each pin extending through the opening in the ear adjacent
thereto.
Description
BRIEF SUMMARY OF THE INVENTION
The invention relates generally to a damper unit for controlling
the flow of air into a room or other closure through an opening
either in the wall or in the ceiling thereof. More particularly the
invention relates to control means which are utilized to move
damper blades to allow more or less air to pass through the unit
into a room whereby a heating or air conditioning system may be
properly balanced.
The invention is utilized in connection with that class of damper
units commonly known or referred to as a "butterfly damper." In
this type of structure there are normally two damper blades which
may be moved toward each other in a pivotal action to open the
damper or rotated away from each other to a closed position.
Several problems have presented themselves in the past when units
of this general type were installed in a given heating or air
conditioning system. Damper units of this type are generally
provided with a frame member on which the damper blades are
rotatably mounted. This frame is mounted in the wall or ceiling of
a room and is then covered by a louvered face plate. Such face
plates vary in design. For example, some of them present a
relatively flat surface and others present a rather frustoconical
surface within which the louvers are positioned.
Up to the present time there have been provided various types of
adjusting means so that the person installing the unit may adjust
the blades to a predetermined relative position so that the proper
amount of air may pass through the unit and may be balanced with
the remainder of the air system. It is usually necessary for the
person installing the unit to use a tool for adjusting the damper
blades. The balancing of the air system is usually done after the
face plate is in place. Thus, as will be noted hereinafter, when a
flat face plate is used, the tool may be shorter than is necessary
when the conical louvered face plate is used.
This also presents a problem for those who may wish to modify or
change the setting of the damper blades at some later time. In
other words, an adjusting tool which is relatively short may not be
able to reach the adjusting mechanism where there is a conical
louvered face plate. Thus, heretofore it has been necessary to
provide such adjusting tools of different lengths. The present
invention, however, enables one length of such adjusting tool to be
used for all installations.
As will be noted hereinafter, certain of the parts which heretofore
have been formed of metal are now proposed to be formed of a
suitable plastic material, such as nylon or Teflon, whereby
corrosion is prevented in the operating parts of the adjusting
mechanism.
In view of the foregoing, it is one of the principle objects of the
present invention to provide a damper unit which is extremely
simple in construction wherein certain of the parts thereof are
formed of a corrosion-resistant material, such as a plastic.
Another object of the invention is to provide an adjusting
mechanism in a damper unit wherein the operating tool or handle may
be frictionally held by the adjusting mechanism and yet be
adjustable with respect thereto, whereby only a single length of
operating handle is needed regardless of the type of louvered face
which is applied thereto.
A further object of the invention is to provide an adjusting
mechanism for a damper unit wherein opposed damper blades are
mounted for rotative or pivotal movement about substantially the
edges thereof which are adjacent each other and wherein linear
movement of an operating member causes the blades to rotate towards
each other for opening, or away from each other for closing.
Still another and specific object of the invention is to provide an
adjusting device for adjusting the dampers of an air control unit
wherein a worm is mounted in a plane perpendicular to the plane of
the damper blades when they are closed, together with an operating
member connected to the damper blades and engaging the worm whereby
rotation of the worm will move the operating member in a direction
to open or close the blades simultaneously.
A still further and specific object of the invention is to provide
a damper blade adjusting mechanism wherein a worm is rotatably
mounted and is adapted to be rotated to move the blades for
adjustment purposes and wherein said worm has a noncircular opening
therethrough adapted to receive an operating tool having a similar
cross-sectional configuration whereby the tool may be inserted into
the opening of the worm, thereby to rotate the worm by hand and
adjust the position of the damper blades.
Other objects and advantages of the invention will become apparent
upon reading the following description taken in conjunction with
the accompanying drawings, in which:
FIG. 1 is a transverse vertical sectional view through a damper
unit embodying the present invention illustrating a flat louvered
face plate mounted with respect thereto;
FIG. 2 is a view similar to FIG. 1 but illustrating the unit in
association with a conical louvered face plate;
FIG. 3 is a vertical transverse sectional view through the damper
unit of the present invention showing the damper blades in closed
position;
FIG. 4 is a view similar to FIG. 3 taken at 90.degree. therefrom
but showing the damper blades adjusted to a position where the unit
is open and the damper blades are parallel;
FIG. 5 is an exploded perspective view illustrating the various
elements which constitute the adjusting mechanism of the present
invention;
FIG. 6 is a transverse sectional view illustrating a preferred
cross-sectional configuration of the operating tool or handle
member, and is taken substantially along the plane of line 6-6 of
FIG. 5;
FIG. 7 is a perspective view of the assembled damper unit viewed
from the underside thereof;
FIG. 8 is an under plan view of the operating member which imparts
movement to the damper blades when the worm is rotated;
FIG. 9 is an end elevational view of said operating member and is
taken substantially along the plane of line 9-9 of FIG. 5 looking
to the direction of the arrows, and
FIG. 10 is a side elevational view of the operating member and is
taken substantially along the plane of line 10-10 of FIG. 9 looking
in the direction of the arrows.
DETAILED DESCRIPTION
Referring now more particularly to the drawings and especially to
FIGS. 1 and 2 thereof, the wall or ceiling in which the damper unit
of the present invention is to be mounted is indicated by the
numeral 1. The damper unit itself is generally indicated by the
numeral 2 and comprises a frame member 3 of any desired
configuration, but in the present instance is shown as being
circular. This frame member 3 at the bottom edge thereof is
provided with an out-turned flange 4 which is adapted to bear
against the surface of the wall or ceiling in which the unit is
mounted. The ceiling is provided with an opening of the same
configuration as the frame 3, whereby the unit is adapted to fit
into the opening in the ceiling. A suitable air conduit (not shown)
is connected to the damper unit and extends from a furnace or other
type of air conditioning system.
The upper edge of the frame member 3 is provided with an annular
inturned flange member 5 and within this framework the unit is
open. The opening in the frame is adapted to be closed by a pair of
damper blades 6 and 7 together with a support member generally
indicated by the numeral 8.
This support member is preferably in the form of a channel provided
with a base member 9 and upstanding side flanges 10 and 11. As may
be seen more clearly in FIGS. 3 and 7, this support member 8
extends across the opening of the frame 3 and is secured at each
end thereof to the inturned annular flange 5 by means such as
welding or otherwise.
A substantially U-shaped bracket member, generally indicated by the
numeral 12 (FIG. 5), is mounted on the underside of the
channel-shaped support member 8 preferably at substantially the mid
point between the ends thereof. This bracket consists of spaced
side member 13 and 14, connecting member 15, and out-turned flanges
16 and 17 adapted to bear upwardly against the base 9 of the
support member. Screw members 18 and 19 pass downwardly through the
support member 8 and through the flanges 16 and 17 of the bracket,
whereby the bracket may be secured to said support.
The base member 9 of the support 8 is provided with an opening 20
therethrough and preferably at substantially the mid point thereof
for the purpose of rotatably mounting one end of a worm member 21.
The lower connecting member 15 of the bracket 12 is also provided
with an opening 22 therein which is adapted to rotatably mount the
opposite end of the worm 21. Thus, in their assembled relation when
the bracket 12 is mounted to the underside of the support 8, the
worm 21 will be supported in these two members so that it may be
rotated by a suitable operating tool as will be pointed out
hereinafter.
The worm 21 is provided throughout the length thereof with a
noncircular bore 23. An operating tool generally indicated by the
numeral 24, is provided with a noncircular elongated shaft 25
having at one end thereof the handle portion 26. This elongated
shaft 25 of the operating tool is adapted to be received by the
bore 23 in the worm 21 so that rotation of the operating tool will
rotate the worm for operating the damper members as will presently
be seen.
As mentioned hereinabove, the worm 21 is preferably formed of a
corrosion-resistant material, such as a plastic, and the operating
tool 24 is also preferably formed out of a similar material. One
reason for this is so that there may be provided a snug frictional
fit between the stem or shaft 25 of the tool and the bore 23 of the
worm, whereby insertion of the operating tool within the worm may
be made easily and yet be retained in any position to which it may
be moved.
The operating member which is provided for the purpose of operating
the damper blades at the time the worm is being rotated is
generally indicated by the numeral 27. The preferred construction
of this operating member is illustrated more clearly in FIGS. 5
through 10 of the drawings. This member is composed essentially of
a flat plate having a main body portion 28. There is an opening 29
in the member which is circular and is adapted to receive the worm
21. Opposed edges of this opening 29 are offset with respect to
each other, as at 29a and 29b, in order that they may be engaged by
the threads on the worm 21, whereby the member 27 will move
lengthwise of the worm when it is rotated.
At one end of the operating member and at one side thereof there is
provided an upwardly extending ear 30 adapted to be secured to one
of the damper blades. At the opposite end of the member 27, as well
as at the opposite side thereof, there is a second and similarly
constructed ear member 31 which also extends upwardly therefrom and
is adapted to be secured to the other damper blade.
The upper end of each of the ears 30 and 31 is enlarged so that
each may be provided with elongated slots 32 and 33. These slots
may be seen more clearly in FIGS. 1, 2, 4, 5, and 10.
Near the center of each of the damper blades 6 and 7 and adjacent
the inner edge of each there is an ear which is stamped out of the
blade and which extends inwardly or downwardly away therefrom. Each
of these ears is secured to the operating member 27. The ear which
is connected to the upper end of the ear 30 on the operating member
27 is not visible in the drawings. However, it is identical with
the ear indicated by the numeral 33 in FIGS. 1, 2 and 4, which is
shown as being pivotally connected to the ear 31 extending upwardly
from the plate 28 of the operating member 27.
Extending upwardly from each of the damper blades 6 and 7 there is
a pair of ears which have openings therein adapted to receive a
pivot member which is stamped out of the adjacent side of the
transverse support member 8, thereby to render each of the damper
blades rotatable. In FIGS. 1, 2 and 4 there are two of these ears
34 extending outwardly from the inner edge of the damper blade 7
and there is a like pair of ears 35 extending upwardly in a
comparable position on the damper blade 6. A plurality of pivot
members in the form of hooks, such as that shown in FIG. 1 by the
numeral 36, extend outwardly in opposed directions from each of the
upwardly extending sides 11 and 10, respectively, of the transverse
support member 8. These pivot or hook members, such as that shown
at 36, extend outwardly from the transverse support and are bent so
as to be received by openings in the ears 34 and 35. Thus, it will
be seen that as the operating member 27 moves upwardly and
downwardly by rotation of the worm 21, it will cause the damper
blades 6 and 7 to be rotated about the pivots and cause these
blades to open when the operating member moves upwardly, and to
close when the operating member moves downwardly.
As indicated above, when the unit is being installed and the
heating or air conditioning system is being balanced, the blades 6
and 7 will be moved to a predetermined open position and will
preferably remain in that position so that the system will be
maintained in balance at all times. In order that the blades may
not be inadvertently opened farther than they should be, a stop
arrangement is provided to prevent further opening movement of the
blades once they have been set. This is accomplished by means of a
rotatable stop member 37 (see FIGS. 3, 5 and 7) which stop member
has a threaded opening therethrough and is adapted to receive the
threaded member 18. The operating member 27 has a second relatively
flat plate portion 38 which is offset downwardly from and is
connected along one edge of the main body portion 28. This offset
plate portion is provided with an opening 39 through which the
threaded member 18 may extend freely, as well as a slot 40, through
which one side 13 of the bracket 12 is adapted to extend. When
these parts are assembled, the threaded member 18 has the function
of securing the one side of the bracket 12 to the underside of the
transverse support member 8 and at the same time will receive the
threaded stop member 37 and will pass freely through the opening 39
of the operating member. The screw 19 will secure the opposite side
of the bracket 12 to the underside of the transverse support 8.
As will be evident, and as will also be observed from viewing FIG.
3, the stop member 37 may be adjusted to any desired position along
the length of the screw member 18, and when it is in the position
such as that shown in FIG. 3 and the operating tool 25 is rotated
to rotate the worm, then the operating member 27 will be caused to
move upwardly, but it may not move beyond the point where the
offset part 38 abuts against the stop member 37. It will be evident
that the reason why this portion of the operating member is offset
is to accommodate the stop member 37 when the damper blades are in
their fully open position.
An added feature of the invention is the provision of means whereby
the operating tool 25 together with its integral handle 26 may be
stored with the unit when it is being shipped. For this purpose a
small clamping member 41 is stamped out of one of the sides of the
bracket 12 and may be more clearly shown in FIGS. 3 and 5. The
space between this clamp 41 and the wall 14 of the bracket from
which it is stamped is such that it will snugly receive the shaft
25 of the tool 24, whereby the tool will lie lengthwise across the
bracket and in a position which is transverse to the support member
8.
This has the advantage that when the unit is shipped, the person
installing the unit will have the proper tool at his finger tips
and available immediately so that he may insert the shaft 25
thereof into the opening of the worm 21 and promptly move the
damper blades to their proper position merely by rotating the tool
and worm.
As mentioned earlier in this description, this arrangement of the
operating tool and the worm permits the same tool to be utilized
regardless of the louvered face that is being used with the unit.
For example, in FIG. 1 the flat louvered face is indicated
generally by the numeral 42, while in FIG. 2 the conical louvered
face is indicated generally by the numeral 43. Obviously, a shorter
tool may be used when adjusting the damper blades where there is a
flat louvered face than is necessary when the conical face is used.
With the arrangement described herein, however, and particularly
when the worm and the operating tool are formed of a noncorrosive
plastic material, the tool may be inserted within the opening in
the worm and will remain merely by friction at any point along the
length thereof to which it has been moved. For example, as shown in
FIG. 1 the tool, even though it is longer than necessary, may be
inserted into the worm and moved upwardly so that only the handle
26 is exposed and none of the shaft may be seen. Likewise, when a
longer tool is normally required, such as in the case of the
conical louvered face 43, the tool will not be inserted as far into
the worm as in FIG. 1 and yet the tool may remain in position
merely by friction so that the blades may be closed at will merely
by rotating the operating tool.
FIG. 4 illustrates the operating tool when it is extended outwardly
and is in an intermediate position as it is being inserted through
the worm.
It is thus evident that there are many advantages which will accrue
from the design as described and disclosed herein. The noncorrosive
feature will permit the parts to be operated over long periods of
time and without any appreciable wear. Furthermore, there is no
longer any need for operating tools with shafts of varying lengths
depending upon the type of louvered face plate that is to be used
in connection with the unit. Heretofore it has been necessary for
the installer to utilize a longer tool for the conical face and a
shorter tool for the flat face, and he could not leave the tools
inserted for future adjustment. Furthermore, the operating tools
were not shipped with the unit because it was not known in advance
as to the type of louvered face plate which was going to be used in
connection therewith.
Changes may be made in the form, construction and arrangement of
parts from those disclosed herein without in any way departing from
the spirit of the invention or sacrificing any of the attendant
advantages thereof, provided, however, that such changes fall
within the scope of the claims appended hereto.
* * * * *