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Патент USA US3051531

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Àug. 28, 1962
Filed June l, 1960
2 Sheets-Sheet 1
FìG. 1
Fl. 2
Àug. 28, 1962
|_„ R, POE
Filed June l, 1960
2 Sheets-Sheet 2
“(12 2?“l “l ITÄHLíZI E?
Á M l/I2
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Patented Aug. 28, 1962
Lloyd R. Poe, Los Angeles, Calif., assigner to Hartwell
Corporation, a corporation of California
Filed .lune 1, 1966, Ser. No. 33,145
4 Claims. (Cl. 292-223)
also provides positive action when the latch is being
As soon as the second movable axis crosses a
plane as defined above, the force of the spring causes the
second movable axis to snap to the upper position de
scribed. In this upper position, the spring also holds the
mechanism against stops provided to limit the retracting
This invention relates to improvements in toggle latches
particularly adapted for flush mounting in the surfaces of
At and about the first movable axis in the latch bolt, the
latch bolt of this invention has oblong holes. These holesA
smooth panels, such as access and inspection doors.
are larger than the diameter of a shaft or pin which may
The principal feature of this invention is the provision 10 be used at this axis for an axle. With these oblong holes,
a range of motion `is provided for the latch bolt when the
of a latch bolt which, even though absolutely prevented
bolt is in the latching position. To prevent chattering and
from being opened by loads acting on the bolt, has a range
of travel when the bolt is in the latched position. This
loose tits, a second torsion spring is also provided in the
latch bolt. This spring is used to bias the upper bearing
permits the use of only one size of latch in installations
where keepers or jams against which the latch bolt bears
surface of the bolt against the keeper of a given installa
With such a range of motion, the latch of this invention
becomes self-accommodating to keepers or door jams
that within the range of travel of the bolt, it positively 20 which may be of various thicknesses. This range of mo
tion is small in any given latch model and will not cause
secures a door or other closure against vibration and partial
upset of the toggle action at the second movable axis in
the latching position. This limited latch bolt mo-tion does,
Another feature of this invention is the provision of a
toggle latch which can be opened easily without regard
however, permit one size of latch to be readily installed
to loads carried by the latch and at the same time provide 25 for use on doors where keepers or door jams, otherwise
a simple latch mechanism which will be reliable under
similar, are of different thicknesses or tolerances.
Other features and advantages of this invention Will be
varying load conditions and under loads which are heavy
apparent from the following description. In the course of
in relation to the design strength of the latch, A particular
the description reference is made to the accompanying
advantage of latch mechanisms according to this invention
is that, as bolt loading is increased, resultant forces trans 30 drawings, in which:
mitted throughout the mechanism tend to increase the
FIG. l is a plan view of the flush-mounted latch of this
invention in place in the latched position in an inspection
force with which the mechanism is held in the latched
may be of different thicknesses or tolerances. Moreover,
no special means are required for iinal adjustment of the
latch after it is installed, when the latch is so constructed
According to my invention a latch bolt and a manually
operable lever are pivotably mounted on a support plate.
The latch bolt and lever are independently arranged on
fixed axes for limited rotation between latching and re
tracted positions. The iixed axes are arranged parallel to
each other at opposite ends of the support.
door such as may be found in aircraft.
FIG. 2 is a view of the underside of the panel and latch
of'FIG. l;
FIG. 3 is a cross section view of the latch of the inven
tion taken along line 3_3 of FIG. 2; and,
FIG. 4 is a cross section View of »the latch of the inven
tion in the retracted position.
lThe latch bolt has a keeper bearing surface which pro 4.0
In FIGS. l land 2 the latch of this invention 10 is shown
jects outwardly of and generally parallel to the support in
attached to a door 11 in panel 12. Projecting through
the latching position. Also, in the latching position the
an opening in the door and flush with the surface thereof
lever is disposed iiush with the surface of a door or mova
is a button 15 which is accessible from the outside of the
ble panel on which the latch mechanism may be mounted.
door for manual actuation.
In the retracted position the latch bolt is withdrawn to 45 lAs may be seen more clearly in FIGS. 3 and 4, button
a position under the support and the lever projects above
15 is part of lever 14.y Lever 14 also comprises a mount
the panel or door surface. In this position the lever can
16. Mount 16 has two parallel arms each of which
has portions in acute angular relationship to one another.
be used as a handle for manually opening such a door or
One end of each of the arms is attached to the button 15.
The mechanism of the invention further comprises a 50 The other ends are pivotably affixed to the -underside
`of latch Support 17 at a first ñxed axis 18. Lever 14
connecting link which is pivotahly mounted at its opposite
rotates through a limited arc about the yaxis 18 in re
ends on the latch bolt and lever. The ends of the con
sponse to manual operation of lbutton 15 for moving
necting link are arranged on movable axes, that is, axes
latch 10 lbetween latching and retracted positions.
which can move relative to the ñxed axes above mentioned.
To accommodate the Ilever 14, support 17 has an open
The outer end of the link is arranged on a ’first movable 55
ing 27 through which the arms of mount 16 project.
axis in the latch bolt. This iirst movable axis is disposed
Support 17 also has a well 20 recessed in its upper side
in the end of the latch bolt generally below and oifset from
to accommodate the limited rotation of ‘button 15.
the latch bolt iixed axis. The other end of the link is
At the other end of support 17, also on the underside
arranged on a second movable axis lin the lever.
ln the latching position, the second movable axis is dis 60 thereof a second ñxed axis 21 is arranged to pivotably
Support a latch bolt 22. Latch ïbolt 22 has a flat keeper
posed parallel to but below a plane defined by ‘the lever
bearing surface 23 which projects beyond support 17 sufb
iixed axis and the first movable axis. In this position,
bearing loads which may be applied to the keeper bearing
`stantially parallel thereto, in the latched position (note
FIG. 3). As shown, the second iixed axis 21 is removed
from the bearing surface 23 at the inner end of latch
which the lever is held in the latching position. For 65 bolt
positive action and to insure that the second movable axis
Link 24 connects lever 14 and latch Ibolt 22 so that
will assume and not be vibrated from this position, a
«bolt 2,2 can be moved when the lever is operated lbetween
torsion spring is provided to bias the lever end of the link.
latching and retracted positions. The link 24 is rotatably
ln the retracted position, the second movable axis lies
a?ìxed at its ends to axes which are movable relative
parallel to but above a plane deiined by the lever fixed axis 70 to the iiXed axes.
and the first movable axis. The torsion spring provided
As shown, one end of link 24 is arranged on a lirst
surface of the latch bolt tend to increase the force with
movable axis 25 also in the inner end of the latch bolt
22. First movable axis 25 is offset in bolt 22 below
a line connecting the keeper bearing surface 23 and the
second fixed axis 21.
and 18. The biasing force exerted through axis 26 vthen
bolds the second movable axis above that plane with the
mechanism engaging the stops provided.
ÁOblong lholes 29 are provided in latch bol-t 22 about
the pin at the first movable axis 25. With oblong holes
29, the latch bolt 22 has a range of movement in the
latched position. This range is suñiciently small so that
the locking action at the second movable axis 26, above
described, is not disturbed when the mechanism is in the
The other end of link 24 is arranged on a second mov
able axis 26 in the arms of mount 16. The second
. movable axis 26 is at the junctures of the described acute
angular portions of the arms in mount 16.
IIn the latching position as shown in FIG. 3, it can
plane defined by the first axes, i.e., the first fixed -axis
latched position.
However, with the oblong holes 29, the fiat keeper
18 and the first movable axis 25.
bearing surface 23 can accommodate keepers or door
be seen that the second movable axis 26 lies below a
With second movable
axis 26 below this plane, bearing loads applied to the
jams of various thicknesses. Often such keepers or jams
keeper bearing surface 23 of latch ‘bolt 22 produce oom
are manufactured to equal norminal dimensions but,
pression in link 24 and a downward force component 15 within tolerance limits of, for example, .0‘6 inch, actual
acting through the second movable axis 26 and the upper
thicknesses will vary. ' The latches of this invention can
arms of lever 14.
Such a force component causes button
be readily installed, notwithstanding such variations.
15 of lever 14 to bear against support 17 so that mainte
The deflection range provided for latch bolt 22 is small
nance of the latching position is assured, as long as, of
relative to its overall length. It can therefore be said that
course, the forces do not exceed the structural limits of 20 the keeper bearing surface 23 is disposed generally parallel
materials used.
to -support 17 lwhen in the latched position. In this
In the retracted position as shown in FIG. 4, the sec
“parallel” position, keeper bearing surface 23 can move
ond movable axis 26 lies above a plane defined by the
“parallel” to itself to adjust to the thickness variations.
first axes 18 and 25. This position is obtained by manu
This movement in a specific latch model can be, as men
ally depressing the end of button 15 which is cantilevered 25 tioned, .06- inch.
over well 20. Stops for this retracted position can be
To prevent loose fitting and chattering, a second tor
easily provided by designing well 20 so that the end of
sion spring 30 .is provided at latch bolt 22. This spring
button 15 bears against the inner wall of the Well. Stops
30 has two coils disposed around a pin >at the second fixed
can also be provided by the edge of opening 27 so that
axis 21. The coils are connected by a loop 19 which is
the arms of mount 16 'bear against the edge in the re 30 disposed against the coil of torsion spring 28. Spring 30
tracted position.
also has end portions which project under keeper bearing
As shown in FIG. 4, the opposite end of button 15
23. Spring 30 being stressed, exerts forces which
projects above support 17. This opposite button end is
act through first movable axis 25 and which act upward
sufficiently large to provide a convenient handle or grip
against said keeper bearing surface 23. This spring load
when rthe button is disposed above the Surface of a door 35
causes bolt 22 to bear against the object it engages at all
on which the latch is used. The button of lever 14 may
times when the mechanism is in the latching position.
then be grasped when the latch is retracted to pull the
This arrangement is important because time and at
door, such as door 11 in rFIG. l, open.
tendant expense are not required for final installation
'As described, button 15 seats firmly on support 1‘7 in
the latched position. This action provides a seal around 40 adjustments or perhaps remachining or parts substitution.
Models of this latch can be readily standardized for gen
the edges of opening 27 in support 17. In this way the
eral rather than .specific applications. Such standardiza
latch provided by this invention is dust and splash proof.
lf additional sealing protection is desired, a vgasket may
also be installed around opening 27.
-tion reduces procurement times as well as unit costs be
cause these latches are therefore adaptable to mass pro
bodiment described by holes drilled through the inter
following claims.
It should be understood that the several axes of rota 45 duction techniques and inventory stocking.
Having thus described my invention, I wish it under
tion described above can be provided -in different ways
stood that many details discussed above are illustrative.
depending on the structural shapes used in the latch com
Accordingly, the scope of my invention is defined in the
ponents. They are conveniently provided in the em
connected components. These holes are aligned con 50
centric with the desired axis in each case and pins are
inserted therethrou-gh to maintain such alignment and
provide an axle at each of the axes. The ends of the
pins are spread or peened -to keep them from falling out.
I claim:
l. In a flush type toggle latch having a support struc
ture, a level pivotably mounted at a first fixed axis near
one end of said support, a latch bolt rotatably supported
at a second fixed -axis remote from said first fixed axis,
T'o insure positive toggle action at the second movable 55 said latch bolt having a keeper bearing surface, said second
fixed axis being at one end of said bolt remote from said
axis 26, a torsion spring 28 is used. This spring 28 has
bearing surface, said bolt being rotatable about said sec
a coil portion which is disposed around la pin -at the
ond fixed axis between latching and retracted positions,
first movable axis 25. Spring 28 also has end portions
a connecting link rotatably añixed at its ends to said lever
one of which bears against a pin at the second fixed axis
21 and the other against a pin at the second movable 60 and to said latch bolt, one end of said link being afiîxed
to said bolt at a first movable axis, said first movable axis
axis 26. The spring 28 is in compression so that its end
being at said latch bolt one end and offset from a line
portions exert opposing forces which act through axes
connecting said keeper bearing surface and said second
fixed axis, the other end of said link being affixed to said
21 and 26.
The force exerted through the second movable axis
26 biases link 24 and Ilever 14 so that the second mov
able axis 26 is lhel-d below the plane defined by first
axes 25 and 18 when the mechanism is in the latched
position. This biasing force insures that changes in air
lever at a second movable axis, said first vaxes defining a
plane, said second movable axis being below said plane
in said latchíng position and above the same in said re
tracted position, and a torsion spring having a coil portion
encompassing said first movable axis and end portions
pressure on the ou-ter surfaces of door 11 and button 15
and that operating vibrations will not cause the latch 70 connected to said second axes, the improvement which
comprises oblong passages in said latch bolt one end, said
bolt 23 to retract.
passages being disposed at and about said first movable
When lever- 14 is actuated to move latch bolt 22 to
axis to accommodate limited swinging movement of said
the retracted position, force exerted through the second
bolt when said second movable axis is below said plane.
movable axis 26 causes the mechanism to snap open yas
2. The toggle latch combination of claim l yand in
soon as axis 26 crosses a plane defined by first axes 25 75
which .said support has a well type depression in its upper
surface, said lever has a button type portion exposed above
said support for manual actuation which button portion
is supported, in said latching position, with one end
thereof over said depression, said depression being of a 5
depth and Width to accommodate said button one end
when the latch is in said retracted position.
3. The toggle latch combination of claim 2 and in
said second spring having coils `aiìîxed around said second
iixed axis, a connecting loop between said coils, said loop
being disposed against said first movable axis, and ends
projecting from said coils against the lower side of said
latch bolt bearing surface.
References Cited in the ñle of this patent
which said button one end resides in contact with an inner
Wall of said depression to limit swinging movement of
said lever in `said retracted position.
4. The toggle latch combination of claim 2 and which
a second torsion spring is disposed in said latch bolt,
Larson _______________ __ Apr. 2, 1946
Gander ______________ __ Dec. 16, 1952
Smith et al. ___________ __ Mar. 8, 1960
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