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Патент USA US2119743

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June?, 193s.
Filed sept'. 9, 1957
J Har/wh q,d
Chas fer P ?/df/"O/Y
Patented June 7, 1938
Philip J. Harrah and Chester P. Harrah,
Bloomfield, Ind.
AApplication September 9, 1937, Serial No. 163,002
6 Claims. (Cl. 16-51)
This invention relates to improvements in door ner. A plate 9 has screw holes therethrough for
checks employing toggle levers for securing max
the passage of screws lil by which the plate is
imum pressure and also employing a piston re
ciprocating through a liquid íiowing through
5 ports from one side of the piston to the other
for regulating the rate of movement of the door
by Varying the size of the ports.
The object of the invention is to balance the
toggle action on the piston and to provide an
easy means for varying the size of the ports act
ing with the lever to control the rate of move
ment of the door.
A further and important object is to control
the opening and closing of the toggle levers and
eliminate a fixed and solid attachment of the le
vers to the door thereby obviating pressure or
strain on the door hinges.
Another object is to provide a door check which
can be adapted to heavy, medium, or light doors
N o by changing the-size of the toggle lever operat
ing springs, and to provide a. door check which
is operative with four or only two levers, and
which can be turned either side up for right or
left door fittings, and which can be placed> in any
desired height on the door.
The object also is to provide a bar or lever
which will raise or lower the piston rod in a door
check without interference caused by varying po
sition of hinges on different doors.
We accomplish the above and other objects
which will hereinafter appear by the mechanism
illustrated in the accompanying drawing, in
Fig. 1 is a side elevation of parts of a door and
door frame member with our invention applied
thereto in contracted or closed position of the
Fig. 2 is a top plan View of same with a dash
line indicating the center position of the door
when open and the dotted lines indicating the
door and door check when past the center posi
Fig. 3 is a detail on an enlarged scale of the
cylinder in vertical section;
fastened securely to the casing 6, and formed
on the plate 9 is a U-shaped bracket Il having
a hole in the outer end of each leg to receive
a, hinge pin I2 having a head at its upper end
and screwthreaded at its lower end where it re
ceives a nut to- prevent the accidental withdrawal
of the pin. Hingedly mounted on the pin I2 is
a clip I3, here shown as a metal plate bent U
shape with a middle cylinder to surround the
pin and each leg extended and formed into- a
pair of ears, the ears of one leg-mating with
corresponding ears of the other leg to-form new
pairs between which the ends of toggle levers I4 15
and I5 are pivoted by pins I6 and I'I inserted
through holes for that purpose formed in the
ears. The purpose of the toggle levers will lbe
presently explained.
- Y
The U-shaped bracket Il has holes through 20
each leg near the plate 9, through which a sec
ond hinge pin I8 is passed and by which an end
of a bar I9, which we designate as a tie-bar, is
hinged to the bracket. As here shown this bail
I9 is stamped out of sheet steel and for maxi 25
mum strength andY stiffness has its longitudinal
edges bent out at right angles into iianges 20 and
2|. These ñanges atA the opposite end of the bar
from its hinge, are extended into ears 22 and are
perforated to receive a hinge pin 24, similar in 30
all respects to the hinge pin I2, by which a clip
25, in al1 respects like the clip I3, is hinged to the
The outer end of the tie-bar I9 is formed into
a curved flange 26 to stiften the bar transversely
and also to cause that end to slide against the
door without marring the door. The tie-bar I9
is preferably further stiffened by the longitu
dinal corrugations 21.
' Pivotally mounted in the clip 25 are the ends 40
of toggle levers 28 and 29 which are duplicates
of the lvers I4 and I5. All four of the levers
I4, I5, 28 and 29 are bent or cranked-to slightly
S-shape. The lower pairs I5 and 29 havead
Fig. 4 is a detail in front elevation of the . jacent ends pivotally secured to corresponding
ears of a clip 30 which is ñxed to the lower end
Fig. 5 is a side elevation similar to Fig. 1 of closure of a vertical cylinder 3|. Reciprocating
a modiñed form of my device; and
within the cylinder is a piston 32 having a rod
Fig. 6 is a jamb bracket used in some instal
33, the outside end of which has a head which isY
bar on which the door check is assembled;
i0 lations.
Like characters of reference indicate like parts
in the several views of the drawing.
In the drawing 6 indicates a door frame mem
ber, in this instance a casing, and 'I a door piv
i5 otally mounted by hinges 8 in the usual man
ñxed in a clip 34, having ears 35, 35, to which
the adjacent ends of levers I4 and`28 are pivot
ally, or in other words, hingedly attached. ~
The lever I4 is connected to the lever I5 by a
spring 36 and the levers 28 and 29 are connected
by a spring 31.
The tie-bar I9 is provided with a longitudinal
slot 38 adjacent the end farthest from hinge I8,
and a wood screw 3S is passed through the slot
into the door as Shown in Fig. 2. A über washer
is preferably placed around the screw between
the tie-bar and the door.
Referring now to Fig. 3, the piston rod 33 is
hollow. It is externally screw threaded at its
lower end and a metal washer 4I) having
10 a threaded hole is screwed on the rod 33 as far
as it will go. Then a leather 4I is placed against
the washer 40 and is followed by a washer 42,
not threaded, and after that a threaded nut 43 is
screwed on the end of the piston rod to hold the
15 assembly.
Formed through the wall of the hollow piston
rod 33 is an oil port 44 and formed through the
bottom of the cap 43 is a port 45. As the piston
32 is forced down the oil will be forced from be
low the piston through the ports to above the
piston, and conversely when the travel of the pis
ton is reversed.
A rod 46 ñlls the bore of the rod 33 to and
closing the port 44, partially or completely, de
pending upon the extension of rod 46 into rod
33. This extension is regulated at an enlarged
and threaded end of rod 46, screwing into a
threaded socket in the head end of the rod 33.
The rod 46 can be screwed in or out by the aid of
30k a screwdriver. A plug 41 in the lower end of
the cylinder affords access for drainage and ñll
ing of the cylinder.
A Wire cloth strainer 48 is located in the cap
43 to prevent the entrance into the ports of foreign
35 matter that might clog them.
In the modification shown in Fig. 5 the two
lower toggle levers are omitted by fastening the
lower ends of the two springs to the ears of a`
bracket 49. The bracket is secured by a ball and
socket joint to a hanger depending from the tie
bar I9. The bracket also supports the cylinder.
To pack around the piston rod when it leaves
the top of the cylinder, we form a cup 5I through
which the piston rod passes. The cup 5I is filled
with packing rings which are pressed by a gland
52 screwing into the threaded end of the cap.
In the operation of our device when the door is
closed the piston is near the lower end of the cyl
inder and in opening the: door the hinge pins I2
50 and 24 are brought nearer together, spreading
the toggle levers I4 and 28 further away from
the toggle levers I5 and 29 and carrying the pis
ton rod 33 upwardly and lowering the cylinder
3|; also equally straining the springs 36 and 37
55 which act to check the spreading apart of the
levers. The reverse movement of the piston is
accomplished by closing of the door. The con
traction of the springs forces the hinge pins apart
closing the door and also lowers the piston in the
60 oil and the resistance is regulated by the size of
the orifice controlled by the position of rod 46,
the change in size permitting a variation in clos
ing speeds of the door.
By hinging the levers 28 and 29 to the tie-bar
65 I9 instead of to the door, the parts of the device
are all assembled ready for use, only requiring
that the plate 9 be screwed to the door frame
member and the tie-bar secured to the door by
inserting screw 38 through the slot 3B into the
door. When the pin I8 is in alignment with
the pintle of hinges 8 of the door, the slot and
its screw 39 are not required.
The jamb bracket, shown in Fig. 6, is used on
some installations where there is no available
door frame member for other attachment.
By the use of the tie-bar pivoted to the same
bracket as the door check, but at separated
points, pivoting the other end of the door check
to the tie-bar and slidingly contacting that end
of the tie-bar against the door, the three result
ing pivotal points are made uniform regardless
of how the door itself is hinged and the door
hinges are relieved from much of the strain.
We claim:
1. In a door check for a hinged door, having
frame member and having a movable cylinder,
piston reciprocating therein, a piston rod and
port from one side of the piston to the other,
bracket fastened to» the door frame member,
pair of toggle levers pivotally supported from the
outer end of the bracket having the other end
of one of the levers pivotally attached to the pis
ton rod and the other end of the other lever
pivotally attached to the cylinder, a tie-bar
hinged at one end to the bracket and attached
to the door, a second pair of levers pivotally sup
ported from the end of the tie-bar remote from
the hinge of the bar, the other end of one of
the last levers pivotally attached to the piston
rod` and the other end of the other of said last 25
levers pivotally attached to the cylinder and a
pair of springs, one on each side of the cylinder,
connecting the pair of levers on that side of the
2. For a hinged door having a frame member, 30
a bracket attached to the frame member, a door
check attached to the bracket and a bar attached
to the bracket closer to the door and bearing
slidingly at its other end against the door.
3. For a hinged door having a frame member, 35
a bracket fastened to the frame member, a tie
bar hinged at one end to the bracket and a door
check hinged to the bracket and sliding against
the door at its other end as the door is swing
ingly moved, and to the tie-bar.
4. For a hinged door having a frame member,
a bracket fastened to the frame member, a tie
bar hinged at one end to the bracket, means for
securing the bar to the door to allow for lon-`
gitudinal adjustment of the bar on the door, a
cylinder, a piston reciprocating therein having a
rod and a by pass from one side to the other of
the piston, a pair of levers hinged at adjacent
ends to the end of the bracket and at their other
ends to the piston rod and lower end of the cyl
inder respectively, a second pair of levers on the
rother side of the cylinder from the first pair
having adjacent ends hinged to the end of the
tie-bar remote from the hinged end of the bar
`and said levers having their other ends hinged
to the piston rod and to the lower end of the
cylinder respectively.
5. For a hinged door having a frame member,
-a bracket attached to the frame member, a bar
pivotally attached at one end to the bracket and
slidingly bearing at its other end against the door
and a door check pivoted at one end to the brack
et at a point more remote from the base of the
bracket than where the bar is pivoted and said
»door check pivoted at its other end to the bar.
6. For a hinged door having a frame member,
fa bracket attached to the frame member, a door
check, a tie-bar pivoted to a fixed support at one
end and sliding against the door at the other
end as the door is swingingly moved, said door
check and tie-bar pivoted at different distances
from the frame member.
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