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Патент USA US3095932

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' July 2, 1963
3,095,922
R. B. FRAZIER
COUNTERBALANCE AND STOP MEANS FOR UPWARDLY ACTING CLOSURES
2 Sheets-Sheet 1
Filed April 4, 1958
Ram‘é/ B17022,"
BY
ATTORNEY,
July 2, 19.63
R. B. FRAZIER
3,095,922
COUNTERBALANCEI AND STOP MEANS FOR UPWARDLY ACTING CLOSURES
Filed April 4, 1958
2 Sheets-Sheet 2
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Mr,
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. INVENTOR
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ATTORNEY
United States' Patent 0 ” ice
1
3,095,922
Patented July 2, 1963
2
this invention is adaptable to various types of closures of
3,095,922
COUNTERBALANCE AND STOP MEANS FOR
UPWARDLY ACTING CLOSURES
Russel B. Frazier, Hartford City, Ind, assignor to (Ever
head Door Corporation, Hartford City, Ind.
Filed Apr. 4, 1958, Ser- No. 726,385
4 Claims. ((31. 160—191)
the vertically reciprocating type.
The drums 8 are mounted on the shaft 7 to be driven
therewith, the shaft being powered by means of the coil
5 spring 9 which is sleeved thereon, one end of the spring
being connected to the shaft at 10 and the other being
connected to the wall mounted bracket 11.
The drums illustrated are conical and are provided with
peripheral spiral grooves 12 for the cable 13. The cable
This invention relates to a counterbalance and stop
means for doors or closures, and one which is particularly 10 is attached at one end to the drum at its larger end and
at the other to the lower edge of the door. The spring 9
desirable for use in connection with such doors or clo
is tensioned to substantially counterbalance the door, but
sures in which the entire opening and closing movement
it does not have enough tension to initiate the opening
is vertical.
movement of the door when it is in closed position. The
The main objects of this invention are:
First, to provide a counterbalance and stop means ‘for 15 cable is attached to the drum so that it is wound thereon
on the opening movement of the door and is unwound
door or closure assembly having vertical reciprocatory
therefrom on the closing movement of the door. The
opening and closing movement and one which may be
door check or brake member 14 is of segmental cam-like
readily adjusted to meet varying installation conditions.
or tapering shape and is provided with an internal rib 15
Second, to provide a counterbalance means for closures
of the vertically reciprocating opening and closing type in 20 which supportedly ?ts within the groove of the drum.
This brake member may be rotatably adjusted on the
which the counterbalancing means includes a stop means
drum and secured in its adjusted or selected position as
or means acting as a stop for checking the opening move
ment.
by means of one or more screws 16.
The drum is desirably provided with a plurality of screw
Third, to provide a counterbalancing means having
these advantages which is capable of a wide range of ad 25 holes 17 so that the brake member may be selectively
positioned on the drum to adapt to particular installations,
justment to meet the varying installing conditions.
the brake member being positioned so that it engages the
Fourth, to provide a counterbalancing means having
cable as the door closely approaches its fully open position.
these advantages which may be readily adjusted at the
This brake member is provided with a peripheral cable
place of installation to adapt to particular conditions.
Objects relating to details and economies of the inven 30 groove 18 which merges into the groove of the drum.
When the cable engages the brake member its radial dis
tion will appear from the description to follow. The
tance from the shaft is gradually increased and thereby
invention is de?ned and pointed out in the claims.
in effect increase the load of the cable on the spring to
A preferred embodiment of the invention is illustrated
such degree that it serves to check the movement of the
in the accompanying drawing, in which:
FIG. 1 is a fragmentary inside elevational View of an 35 door, and serves the purpose of a stop or bumper which
upwardly acting door assembly embodying my invention,
various parts being shown conventionally, the door being
have been heretofore commonly used, but it also serves
as a slowup check means which is important as abrupt
stops frequently cause. noise or breakage when the door
shown in closed position.
comes in contact therewith. This brake mechanism serves
FIG. 2 is an enlarged fragmentary vertical sectional
40 to gradually stop the door.
view with the door in open position.
It will be understood that the tension on the spring 9‘ is
FIG. 3 is a fragmentary perspective view further illus
increased as the door is moved to closed position, and it
trating the relation of some of the parts.
is reduced when the door is moved to open position, but
FIG. 4 is an enlarged fragmentary view corresponding
is still su?‘icient to hold the door in open position. Con
generally to that of FIG. 3 illustrating details of the cable
drum, which is shown partially in section to illustrate the 45 trol of the opening and closing of the door is manual, the
counterbalancing pull of the spring being such as to
relationship of the brake element of the drum to other
minimize the manual labor.
parts thereof.
The applicant is aware that it has long been the practice
FIG. 5 is a perspective view of the cable drum further
to provide upwardly acting doors or closures with counter
illustrating the relationship of the brake element thereof
to other ‘parts of the drum.
50 balancing means, but the present improvement relates to
FIG. 6 is a fragmentary view partially in section and
the provision of a stopping brake for the door on the
partially in full lines further illustrating details of the
brake member and its relationship to the body portion
opening movement thereof.
In the embodiment shown in FIG. 9 the conical drum
20 is provided with an integral brake element 21. This
of the drum.
FIG. 7 is a plan view of the brake element.
‘FIG. 8 is a fragmentary view in section on a line corre
sponding to line 8-8 of FIG. 7.
FIG. 9 is a view partially in vertical section of a modi
?ed form or embodiment of my invention in which the
brake element is formed integrally with the drum.
In the accompanying drawing, 1 represents a wall, 2 a
door frame and 3 a sill. The door designated generally
by the numeral 4 is of the sectional type being made up
of a plurality of sections hingedly connected at their meet—
drum 20 is adjustably mounted on the shaft 7 as by means
of a screw 22 which is desirably tapped into the shaft as
is illustrated. Thus the drum may be rotated on the shaft
to properly position the brake element 21 thereof for a
particular installation. It is contemplated that the hole
in the shaft will be drilled after it is determined in what
position the drum should be located to properly position
the brake element 21 thereof relative to the opening move
ment of the door.
I have illustrated and described my invention in a
ing edges by hinges 5. The door is mounted for vertical 65 highly practical commercial embodiment thereof. 'In the
embodiment shown in FIGS. 1 to 8 inclusive the holes
reciprocatory opening and closing movement in the tracks
17 for the attaching screw 1-6 may be tapped into the
6 which, in the embodiment illustrated, are substantially
drum when it is manufactured or they may be readily
vertical, the upper ends of the tracks being inclined so that
drilled or tapped at the place of installation. If pre
they may project above shaft 7 on which the winding
drums 8 are mounted. The details of the door structure 70 formed, a number of them are provided as is indicated
in FIGS. 4 and 6. My invention is capable of a wide
as such form no part of the present invention and are
range of adaptations, but 1 have not attempted to il
therefore not described, and it is to be understood that
3,095,922
3
4
i‘lustrate or- describe the same (as it is believed that this
disclosure will enable those skilled in the art to embody or
by the cable as the closure member approaches a pre
determined open position.
3. An upwardly acting door assembly including a door
and substantially vertical tracks with which the door is
adapt the same as may be desired.
_ Having thus described the invention, what is claimed
as new and desired 'to secure by Letters Patent is: a
associated for vertical reciprocating opening and closing
1. An upwardly acting door assembly including a door
and substantially vertical tracks with which the door is
associated vfor vertical reciprocating opening and ‘closing
movement, a counterbalance means ‘for the door com
movement, a counterbalance means for the door com
to said drum, a cable connected to said drum to wind
prising a rotatably mounted peripherally grooved cable
drum, a door counterbalance spring drivingly connected
prising a rotatably mounted conical drum provided with 10 thereon on the opening movement of the door and to be
a spiral peripheral cable groove, a door'counterbalance
spring drivingly connected to said drum, a ‘cable con
nectedto said drum to wind thereon ‘on the opening
movement of the- door and to be unwound therefrom on
thetclosing movement of the door with the drum under 15
unwound therefrom on the closing movement of the door
with the drum under continuous torsional stress of said
continuous torsional stress of said spring, a segmental
spring, asegmental cam-like brake member conformed
on its inner edge to be supportedly engaged in the groove
of the drum and having a peripheral cable groove which
merges into the cable groove of the drum and is of in
cam-like brake member having a rib on its inner edge con
creasing radius and is positioned on said drum to be en
formed’to supportedly engage the drum groove and having
gaged by the cable as the door approaches a predeter
a peripheral cable groove which merges into the cable
mined open position, and means for securing said brake
groove of the drum, but which'is of reverse pitch’ to that 20 member to said drum in its adjusted position thereon.
portion‘ of the groove of the drum in which the brake
member is disposed, said brake member being positioned
on said drum to be engaged by the cable as the door
reaches a predetermined open position, and means for
4. An upwardly acting door assembly including a door
and substantially vertical tracks with which the door is
associated {for vertical reciprocating opening and closing
movement, a counterbalance means vfor the door com
securing said brake member to said drum in its adjusted 25 prising a rotatably mounted peripherally grooved cable
position thereon.
l
drum, a door counterbalance spring drivingly connected
2. A counterbalance means for a closure member
mounted for vertical reciprocating opening ‘and closing
to said drum, and a cable connected to said drum to
wind thereon on the opening movement of the door and
to be unwound therefrom on the closing movement of
movement, and comprising a rotatably mounted conical
drum provided with a spiral peripheral cable groove, a 30 the door with the drum under continuous torsional stress
door counterbalance spring drivingly connected to said
of said spring, said drum including a brake member con
drum, a cable connected to said drum to be wound there
formed on its inner edge to be supportedly engaged in
on on the opening movement of the closure member and
the groove of the drum and having a peripheral cable
to be unwound therefrom on the closing movement of
groove which merges into the cable groove of the drum
the closure member with the drum under continuous 35 and is of increasing radius and is positioned on said drum
to be engaged by the cable as the door approaches a
torsional stress of said spring, a segmental cam-like brake
predetermined open position.
member conformed on its inner edge to be supportedly
engaged in the groove of the drum and having a peé
References Cited in the ?le of this patent
ripheral cable groove which merges into the cable groove
40
UNITED STATES PATENTS
of the drum but which is of reverse pitch to that of the
portion of ‘the groove of the drum in which the brake
Parsons ____________ __ Mar. 16, 1943
2,314,015
member is disposed and positioned so that it is engaged
2,480,865‘
Lofstrand ___________ __ Sept. 6, 1949
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