close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3090588

код для вставки
May 21, 1963
E. T. OLSON
3,090,578
SPRING COUNTERBALANCE MECHANISM
Filed June 7, 1961
FI
" FIE. é
INVENTOR.
£045”: 7.’ 0150”
BY
irroawar
United States Patent 0 " IC€
1
3,090,578
§PRING COUNTERBALANCE MECHANISR/i
assists
Patented May 21, 1963
2
by a wrench. Between the head 16 and housing 11 is
a washer 17. Secured upon the threaded portion 18 of
Eugene T. Olson, 2905 Lincoln NE, Minneapolis, Minn
Filed June 7, 1961, Ser. No. 115,360
3 Claims. (€l. 242—-107.5)
shaft 15 is a nut 19 which is in turn welded at 20 to
a tension lever 21. Again a washer 22 is interposed
between the tension lever 21 and housing 11. It may be
pointed out at this time that the threaded portion 18
This invention relates to counterbalances and more
particularly to a spring counterbalance mechanism.
extends only to the washer 22 so that when the nut 19
as well as of the housing.
the housing 11.
is engaged upon the threaded portion 18 to the end of
Some forms of counterbalance units incorporate a ten
the threads, further engagement of the nut will be pre
sion spring which permits only a limited distance of move 10 vented thus causing the shaft 15 to rotate. ‘It is this
ment for the weight being counterbalanced. Others in
feature which allows the shaft 15 to be rotated and ac
corporate a recoil spring which allows uneven counter
cordingly the recoil spring tension adjusted, as will be
explained subsequently.
balance tension throughout the travel distance of the
weight. Still others incorporate a flexible cable as the
To prevent reverse rotation of the tension lever 21
tie means between the weight being counterbalanced and 15 when it is under tension, a tension tie 23 is provided which
the counterbalance unit itself. Cables very often cause
is simply a band of sheet metal, or similar structure, se
undesirable twisting torque of the reel it is wound upon
cured at ends 24 by a bolt and nut combination 25 to
In addition to the undesirable twisting torque often as
Referring now to FIGURES 3 and 4, the internal con
sociated with a cable, there is often undesirable uneven 20 struction of the counterbalance 10 will be explained. Ro
winding of the cable upon the counterbalance reel which
tatably secured to the shaft 15 by means of bearings 26
may cause the cable to ultimately slide off of the reel
is a reel 27. The reel in turn has a pair of reel discs
28, which are secured to the bearings 26, and a plurality
surface.
It is to the elimination of the above mentioned un
of continuous brace structures 29 which de?ne a sub
desirable features of counterbalances which the present 25 stantially circularly oriented supporting edge referred to
invention is intended to overcome. Accordingly:
generally as.30, around the periphery of the reel discs
An object of this invention is to provide a counter~
balance having structure and components which clum
28. The supporting edge is de?ned by the channel area
31 of the braces 29 (see FIGURE 4).
nate twisting side torques;
.
Noting FIGURES 4 and 5 particularly, the braces 29
Another object of this invention is to provide a device 30 consist of a supporting mid-portion 32 which is radially
of the class described which is so constructed and ar
recessed with respect to the humps 33 located at either
ranged that the variations in tension of the counterbal
end thereof. Humps 33 have a reverse bend 34 Which
inter?ts with the outer peripheral edge 35 of the reel
ance will be minimized;
A further object of this invention is to provide ad
discs 28. Continuous with .the humps 33 are mounting
35
justability for counterbalances of di?erent weights with
ends 36 which are welded at 37 to the reel discs for
positive securement thereto.
out changing of counterbalance units;
A still further object is to provide a reel having braces
As seen in FIGURES 3 and 4, the braces 29 and
which stabilize the reel against twisting in addition to
reel discs 28 de?ne an open space 38‘ within which a
providing a guide for the weight strap, and other desir 40 recoil spring 39 is located ‘and con?ned. It is found
that when a recoil spring of steel tape, of considerable
able features;
A further object is to provide a counterbalance which
stiffness, is used, an optimum recoil characteristic is
stresses simplicity of design and construction, and which
achieved which allows substantially even tension on the
lends itself easily to construction and repair.
reel 27 when the reel is actuated. Because of this type
These and other objects and advantages of the inven
of material used, the recoil spring 39 will have a tend
tion will more fully appear from the following descrip
ency to expand outwardly and therefore rides on the inner
tion, made in connection with the accompanying draw
pheriphery surface 40 of the supporting edge 30. The
ing, wherein like reference characters refer to the same
recoil spring, of course, is radially con?ned by the braces
or similar parts throughout the several views and in
29. The outer end 41 of the recoil spring 39- is hooked
about a brace for securement to the reel. The inner
which:
FIGURE 1 is a perspective view of a counterbalance
shown as it would be positioned on a frame (shown in
end 42 is secured to the shaft 15 by means of an anchor
system 43.
The anchor system
phantom drawing), and a typical weight secured thereto
plates or discs 44 which
(also in fantom drawing);
FIGURE 2 is an enlarged top view of FIGURE 1;
55 the shaft 15. Welded
thereto, is an anchor
FIGURE 3 is an enlarged cross-sectional side view of
consists of a pair of anchor
have holes 45 for inter?-tting with
between the anchor plates, and
nut 46. Threaded through the
nut and in engagement therewith is an anchor bolt 47
which is also projecting through the shaft 15, as seen
in FIGURE 4. The purpose of projecting anchor bolt
47 through the shaft is to prevent relative rotational
movement between the shaft and anchor system 43.
Also forming a part of the anchor system is an anchor
in ).
washer 48 which is drawn into clamping contact with
gReferring particularly to FIGURES 1 and 2, a weight
the inner end 42 of the recoil spring 39 for securement
9, typi?ed by a block and which requires counterbalanc
ing, is supported by a spring counterbalance referred to 65 thereto. Inner end 42 also has a hole therethrough
generally as 10 which has a partially enclosing housing
which anchor bolt 47 projects through.
or cover 11, made from sheet material, which has formed‘
Shown wound upon the supporting edge 39 of the reel
as a part thereof its own mounting feet 12. Mounting
is a weight strap ‘49 which is secured by a hook means
feet 12 in turn have mounting holes 13 for securement
50 at the inner end thereof to an anchor pin 51. The
of the housing to a frame 14.
70 anchor pin in turn is secured across the reel discs and
FIGURE 2 taken on line 3-3;
FIGURE 4 is a partial cross-sectional view of FIGURE
3 taken on line 4—4; and
FIGURE 5 is an enlarged perspective view of a brace
as it appears on the reel discs (shown in phantom draw
Shown mounted across the housing, in FIGURE 2,
protrudes therethrough for positive securement thereof.
is a bolt or shaft 15 having a head 16 adapted to be held‘
The outer end of the weight strap is shown as it is
3,090,578
4
protruding exteriorly of the housing for mounting to a
weight.
‘It will be noted at this time that the recoil spring 39
extends substantially the width of the inside dimension
between reel discs 28. With this maximum‘width of the
recoil spring, an optimum spring characteristic may be
A the outer edges of said reel discs whereby said discs and
said braces de?ne an open space between said shaft and
said braces, an anchor pin secured across said reel discs
adjacent the outer edges thereof, a stiff but ?exible metal
weight strap wound externally upon said braces having
one end secured to said anchor pin and the other end
supporting edge 30 and, therefore, the recoil spring
protruding exteriorly of said housing in a free end adapt
ed for attachment to a substantially heavy weight, and
exerts no twisting torque upon the reel mechanism. The
a stiff but ?exible recoil spring wound about said shaft
attained.
In addition there is even radial force on the
weight strap 49 is also substantially the width of the 10 and secured at one end thereto and at the other end to
channel 31. Again, by providing a wide weight strap,
one of said braces, said recoil spring further being con
twisting torques are eliminated.
?ned to said open space and further having a width sub
In the assembly of the counterbalance, a recoil spring
stantially the distance between said reel discs.
is secured at its inner end 42 to the anchor assembly 43.
2. A spring counterbalance as set forth in claim 1
The tension lever 21 is then rotated whereby to cause 15 wherein said braces comprise a continuous supporting mid
the recoil spring to 'be drawn or reeled into the open
portion extending the distance between said reel discs, a
space 38. During this assembly, the reel is held station
hump formed at both ends of said mid-portion and inter
ary and rthe recoil spring is caused to feed between
?tted with the outer edges of said reel discs, and mounting
braces 29 into the open space 38. When the outer end
ends secured to said reel discs at the outer ends of said
41 of the recoil spring is drawn into the open space 38,
humps, whereby said supporting mid-portion is radially
it is then hooked to any one of the braces 29 as shown
recessed from said humps whereby to form a channel for
in ‘FIGURE 3.
With the recoil spring installed, the weight strap 49
seating of said weight strap‘.
3. A spring counterbalance comprising, a housing
then has the inner end thereof hooked upon the anchor
adapted to be mounted to a frame structure, a shaft
pin 51 and, by continued rotation of the tension lever, 25 mounted across said housing, a reel rotatably secured on
has the full travel length of the weight strap wound
said shaft having two substantially circular reel discs se
upon the supporting edge. At this point the tension lever
is locked in position by the tension tie 23. It is now
seen that any unreeling of the weight strap will cause
cured in spaced parallel relation to said shaft by means
of a pair of bearings, said reel also having a plurality of
?at and narrow braces secured across the outer edges of
increasing tension on the recoil spring, and consequently 30 said reel discs whereby said discs and said, braces de?ne
upon the reel 27 and strap 49. If increased tension is
desired on the weight strap, the tension lever may be
an open con?nement between said shaft and said braces,
said braces also having a radially recessed supporting mid
wound additional turns while holding ‘the protruding end . '_ portion when positioned across the outer edges of said
of the weight strap stationary.
discs, an anchor’pin secured across said reel discs adjacent
Accordingly then, a counterbalance is provided which
the outer edges thereof but within said open con?nement,
a stiif but ?exible metal strap wound externally upon said
has no twisting torque associated therewith and, because
of the components incorporated, has a substantially even
braces within said radially recessed portion, said strap
tension on the weight strap through the contemplated
having one end secured to said anchor pin and the other
end'protruding exteriorly of said housing in a free end
amount of run-out thereof. In addition, this simple
design lends the counterbalance to ready adjustment for 40 adapted for attachment to a substantially heavy weight,
different weights without changing counterbalance units.
and a stiff but ‘?exible recoil spring wound about said
Also, by incorporating braces secured across the reel
shaft and secured at one end thereto and at the other end
discs, an additional stabilizing effect is achieved while ~ to one of said braces, said recoil spring further being con
at :the same time providing a channel guiding means for
?ned to said open space and further having a width sub
the winding and unwinding of the weight strap.
45 stantially the distance between said reel discs.
It will, of course, be understood that various changes
may bemade in the form, details, arrangements and
proportions of the parts without departing from the scope
of my invention as set forth in the appended claims.
What is claimed is:
1. A spring counterbalance comprising, a housing
adapted to be mounted to a frame structure, a shaft
mounted across said housing, a reel rotatably secured
on said shaft and having two similar and substantially
circular reel discs secured in spaced relation on said shaft 5
and a plurality of flat and narrow braces secured across
References Cited in the ?le of this patent
UNITED STATES PATENTS
116,108
511,655
532,130
681,864
1,105,680
Sterns ______________ __ June 20, 1871
Small et al ___________ __ Dec. 26, 1893
Woodward et al. ______ __ Jan. 8, 1895
Wallace'et al; ________ -_ Sept. 3, 1901
Mitchell, _____________ __ Aug. 4, 1914
I,679,573
Hind ‘________________ __ Aug. 7, 1928
1,795,529
Watson et al. ________ __ Mar. 10, 1931
Документ
Категория
Без категории
Просмотров
0
Размер файла
390 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа