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Патент USA US3037811

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June 5., 1962
c. E. HAFSTAD
FRIcTïoN LATCH MECHANISM
Filed Jan. 25, 1961
FI c. I
IN VEN TOR.
OAHL E. .HA/rs 'rAo
BY
QZM
.A T TO F1’ N E YS
3,037,851
Patented June 5, 1962
2
FIG. 2, and showing my invention substantially in rear
3,037,801
elevation;
FRICTIGN LATCH MECSM
Carl E. Hafstatl, 828 21st Ave. S., Minneapolis 4, Minn.
Filed Jan. 25, 1961, Ser. No. 84,829
8 Claims. (Cl. 292_76)
FIG. 4 is a view in section taken on the line 4_4 o-f
FIG. `1 with some parts being broken away, and showing
my novel latch mechanism in its closed position;
FIG. 5 is a view similar to FIG. 4, but showing the
This invention relates generally to door latch mech
door member during initial opening movement thereof,
and also showing portions of my novel latch mechanism
anisms, and more particularly it relates to an improved
and useful friction catch of a type which will yield
under the application of force, as distinguished from
the more positive type of locking catches.
More specifically my invention relates to friction latch
mechanisms for use on storm doors and the like, which
are usually provided with positive locking mechanisms.
It is very often true that when doors of the above de
scribed class are provided with positive locking means,
they are prevented from making locking engagement
by the air pressure built up between the same and the
inner door or other door with which they are associ
ated, said pressures either being created by the closing
movements of one or the other of said doors.
Of
course, under such conditions it is very possible that a
situation is presented which the storm door may easily
be broken or otherwise damaged since the same is not
in a positively locked condition. In light of the above, 25
it is an important object of this invention to provide
an improved friction latch mechanism which may be
used either with or without conventional positive lock
ing latch mechanisms to overcome -the conditions and
in a position or condition resulting from opening of the
door member from the outside thereof;
FIG. `6 is a View similar to FIG. 5, but showing said
portions of my latch mechanism in »a position or condi
tion resulting-from the opening of the ydoor member from
the inside thereof, and ialso showing other portions or
elements of my invention in an »alternative position;
FIG. 7 is a view similar to FIGS. 5 and 6, but show
ing the door member `during final closing movement
thereof, and also showing portions of my invention in
their respective positions during ñnal closing movement
of the door member; and
FIG. 8 is a view in horizontal section taken on the
line 8_8 of FIG. -l.
Referring with greater particularity to the drawings,
the door member, represented generally by the reference
letter A, is movably mounted in a jam'b member, which
is represented generally by the reference letter B. A
conventional keeper elementi is rigidly secured to the
inner face b of the jamb member B, near the outer edge
c thereof, by means of a pair of screws 2.
This inven
disadvantages described above.
30 tion resides speciiically in the provision of a friction
Another important object and advantage of this inven
catch, which is represented generally by the reference
tion is the .provision of an improved friction latch mech
numeral 3, the complete latch mechanism including the
anism in which the force required to open the door with
which it is associated is materially greater when certain
keeper element 1, being represented generally herein by
avoided by the person opening the door.
Another object of this invention is the provision of 45
an improved friction latch mechanism in which the same
is adjustably and removably maintained in said position
rigidly securing the supporting housing 5, by means of
or condition wherein a materially greater force is re
bifurcated at the outer side 12 thereof so as to define
quired to open said door, and in which the maintenance
of said additional force may be easily and quickly ren
spaced and alignable spring-carrying flanges 13. As
the reference numeral 4. Also, the inner face of the
parts or elements of said latch mechanisms are disposed 35 door member A is represented by the reference letter a,
in one position or condition than the force required to
the out-er face thereof by the reference letter C, and the
open said door when said parts or elements of said latch
free edge of the door member A being represented Iby the
mechanism are disposed in another condition or position.
reference letter e.
Another object of this invention is the provision of
In accordance with my invention, the latch mechanism
an improved lfriction latch mechanism in which the above 40 4 comprises a rigid supporting housing, represented gen
described greater or additional force required to open
erally by the reference numeral S, said supporting hous
said door when said latch mechanism is in a chosen posi
ing 5 including a front wall 6, an inner side wall 7, a top
tion or condition may be easily and quickly reduced or
wall 8, a bottom wall 9, and vsecurernent flanges 10 for
dered inoperative by the operator of said latch mecha
msm.
the fasteners 11, to the inner face a of the door member
A. It is noted that the back of the supporting housing
5 is generally open, and the supporting housing 5 is also
shown, a pair of elongated coil springs 14, 15 `are carried
by the spaced ñanges 13 of the supporting housing 5 so
as to dispose the respective end portions 16, 17 o-f said
Other objects of this invention reside in `the provision
springs 14, 15 in a fixed relationship with respect to the
door member -A. It is noted that the respective end
tremely simple in construction, relatively inexpensive to 55 portions 16, 17 of the coil springs 14, 15 are rigidly
manufacture, durable and strong throughout its continued
secured, as by welding or soldering, in the respective
use, simple and eñicient in its operation, and highly eñì
positions shown particularly in FIGS. 2, 3, and 8, said
cient in sustaining the above stated purposes.
end portions 16 of the coil spring 14 being engaged with
The above and still further objects of this invention
the arcuate end portions 18 of the flanges 13 and the end
will become apparent from the following detailed speci 60 portions 17 of the coil spring 15 being engaged with the
ñcation, appended claims and attached drawings.
corner defined by the flanges 13, and the outer side 12
Referring to the drawings wherein like reference char
and the front wall 6 of the supporting housing 5.
-acters indicate like parts or elements throughout the sev
An important part of my invention concerns the respec
eral views:
tive positions of the elongated coil springs 14, 1S, and
FIG. l is a view of my invention in front elevation,
and showing portions of cooperating door and jamb mem 65 also the provision of means for selectively changing the
respective positions between the coil springs 14, 15'. More
bers with which my novel friction latch mechanism is
specifically, one respective position or condition of the
of an improved friction latch mechanism which is eX
associated;
FIG. 2 is a view in section taken on the line 2_2 of
springs 14, 15 are disposed in generally laterally spaced
FIG. 3 is a view in section taken on the line 3_3 of
1S when the same are in said one condition are thereby
generally parallel relationship with one another. It is
FIG. 1, and showing my invention substantially in side
70 noted with particularly emphasis that the coil springs 14,
elevation, some parts being broken away;
3,037,801
3
so orientated that the coil spring 14'is engaged by the'
keeper element 1 during initial opening movement of the
door member A with respect to the jamb member B so
that lateral deflection is imparted to the spring 14 in a
direction generally toward the spaced spring 15. Said
engagement of the spring 14 by the keeper` element 1
and the resulting deflection of the spring 14 during initial
opening movement of the door member A is shown
particularly in FIG. 6,. It is noted with emphasis that
the opening force required to open the door member A
when the springs are in said spaced one condition is only
the force needed to deflect the coil spring 14 to the posi
tion shown in FIG. 6 since the coil spring 15 is not de
ñected in said one condition of the springs 14, 15.
For the purpose of providing means for selectively
ladjusting the coil springs 14, 1S so as to define a second
4
.
ing movement of the door member A. More specifically
with respect to the deflection of the coil springs 14, 15
during the initial opening movement of the door mem
ber A when the coil springs 14, 15 are in said second
condition thereof, the coil spring 1S is actually deflected
by the keeper element 1 and said deflection is then im
parted to the engaged intermediate portion 28 of the coil
yspring 15 so as to move said intermediate portion 28 of
the coil spring 15 along the abutment surface 27 of the
slide element 19 during said initial opening movement
of the door member A. It should be stated that in ac
cordance with present practices, the orientation of the coil
springs'14, 15 when the same are in either the -above
described one condition thereof or the second condition
thereof is such that lateral deflection is imparted only
to the coil'spring 14 during ñnal closing movement of
condition or relative position of said coil springs 14, 15,
the door member A with respect to the jamb member B,
a slide element, represented generally by the reference
as shown in FIG. 7.
'
numeral 19, is mounted on the supporting housing 5.
Having speciñcally described my invention, it might be
The slide element 19 generally comprises an elongated 20 helpful to comment with respect to the operative sim
bar, which defines a projecting knob '21 on one side
plicity thereof. Generally speaking, a novel friction catch
thereof and a projecting dog 22 on the other side thereof.
3 has been provided in which the force required to open
The knob 21 has a flange portion 23 which is maintained
the door member A upon which the friction catch 3 is
in spaced relationship with >the bar ofthe slide element
>secured is materially less when the friction catch 3 is in
19 by means of a stub journal 24, said knob 21 being 25 said above described one condition than the force required
removably secured to the slide element 19 by means of
to open the door member A when said friction catch 3
a screw 25. As shown particularly in FIGS. l and 4, the
is in another second condition thereof. More specifically,
front wall 6 of the supporting housing 5 defines an
FIG. 4 of the drawings shows the latch mechanism 4 and
elongated slot 26, Vwhich slot 26 is adapted to receiveY Vthe door member A in the closed position thereof, and
.the stub journal 24 ofthe slide element 19 sothat the
FIG. 5 is illustrative of »a position of the friction catch 3
bar of the slide element l19 is disposed in face-to-face
during initial opening movement of the door member A
sliding relationship with the inner surface of the front
when the door member A is opened from the outside
Vwall 6 of the supporting housing 5 and so that the flange
thereof, it being understood that the terminology “inside”
portion 23 of the knob 21 is disposed in sliding face-.to
and “outside” corresponds to the inner face a and the
face relationship with the outer surface of the front wall 35 outer face b of the door member A. The illustration of
6 of the supporting housing 5. Referring particularly to
FIG. 5 is intended to correspond to the situation described
FIGS. 2 and 4, the slide element 19 also defines an abut
in the introduction to this speciñcation wherein it is
ment surface 27 on the end thereof disposed adjacent the
desirable that amaterially greater force be required to
Vcoil spring 15. The above described construction is such
open the door member A from the outside thereof than
that the slide element 195is thereby mounted on the sup 4.0 the force required to open the door member A from the
porting housing 5 for movement toward and away from
inside thereof, the terminology “outside” and “inside” not
the coil spring 15 between a spaced position in spaced
¿being intended to be a limitation with respect to the rela
relationship to said coil spring 15 (as shown in FIG. 6)
tive positioning of the door member Arwith respect to
yand an engaged position (as shown in FIGS. 2, and 4)
the jarnb member B, but only being given the connotation
vwherein the abutment surface 27 of the slide element 19
described above. It is noted therefore with respect to
is disposed in engagement with a generally intermediate
Y'FIG. 5 that the friction> catch Y3: is shown therein in the
portion 28 of the coil spring 15. Such an engagement
above described second condition thereof so that the
between the abutment surface 27 and said intermediate
,opening of the door member A 4from the outside thereof
portion 28 of the coil spring »15 into engagement with
requires a‘ deñection of both of the coil springs 14, 15.
-the coil spring 14 and thereby defines a second relative 50
Referring to FIG. 6, the same is illustrative of the
condition of the coil springs 14, 15.
conditions present when it is desired to open the door
For the purpose of providing yielding means «to be as
nmember A Vfrom the inside thereof, the obnoxious pres
Vsoc'iated with the supporting housing 5 and the slide ele
sure (noted in the introduction to this l speciñcation)
ment 19 for biasing said slide element 19 toward the
between the door member A and another door (not shown,
above described engaged position thereof in engagement
vand associated with the jamb member B) being obviously
Vwith the coil spring 15 so as to removably maintain both
previously released in this situation by the opening of
of said coil springs 14, 15 in the above described second
said other door. It `will be noted with respect to FIG. 6
condition or position thereof shown in FIGS. 2 and 4, a
that when the ~knob 21 of the slide element 19 is moved
vcompression spring 29 is interposed between la detent 30
in a direction away from the coil spring 15, the abut
60
deñned on the dog 22 of the slide element 19 and an
ment surface of the slide element 19 is removed from
opposed and aligned detent 31 defined by the side wall 7
its engagement with the generally intermediate portion 28
of the supporting housing 5. In the position of the com
of the coil spring »15 and the coilu springs 14, 15arev
pression spring 29 shown »and described, the axis thereof
then disposed in the above described one condition thereof
is Vdisposed in general normality to thelongitudinal axes
wherein said springs«14, 15 are in laterally spaced gen
of the elongated coil springs 14, 15 so that Vthe coil spring 65 erally parallel relationship. Obviously, in this condition
15 is normally biased in such manner as 4to define the
__of the springs 14, 15, the force required to open the door
.above described second condition or relative position of
memberA need only be suflicient to deñect the coil spring
Ythe coil springs 14, 15. It should be noted with particular
14. It should also be noted that FIG. 7 is> illustrative
emphasis that when the coil springs 14, 15 are in the
of the position of the friction catch 3 du-ring final closing
70
above described second relative condition thereof, they
Vmovement of the door member A. In this situation, only
are thereby orientated so that the coil spring 14 is engaged
a relatively small force is required to close the door
by the keeper element .1 during initial opening movement
'_of the door member A with respect to the jamb member
B so that generally concerted lateral deñection is imparted
`member A, without regard to‘whether the coil springs 14,
l5 Áare disposed in either of the above described one con
dition `or second condition thereof. Obviously, the coil
_to both of the coil springs 14, 15 during said initial open~ 75 springs
14, 15 of the friction catch 3 will usually' be
3,037,801
5
6
disposed in the second above described spaced condition
thereof shown particularly in FIGS. 4, 5 and 7, this being
due to the biasing of the slide element 19 toward the coil
deline a second condition of said springs, said coil springs
when in said second condition being so orientated that
said one spring is engaged by said keeper element during
spring 15 by the compression spring 29.
initial opening movement of said door member with re
This invention has been thoroughly tested and found to
be completely satisfactory for the accomplishment of the
spect to said jamb member so that generally concerted
lateral deflection is imparted to both of said coil springs
during said movement, whereby the force required to
above objects; and while I have shown and described
deñect both of said springs and open said door member
above a preferred embodiment thereof in which the prin~
when said springs are in said second condition is material
ciples of the present invention have been incorporated, I
wish it to be specifically understood that the same may 10 ly greater than the force required to deñect said one
spring md open said door member when said springs are
be modified without departure from the scope and spirit
in said one condition, the orientation of said coil springs
of the appended claims.
when the same are in a selection of Said one condition and
What I claim is:
sai-d second condition being such that lateral deflection
l. In a latch mechanism for latching a door member
mounted for opening and closing movements relative to a 15 is imparted only to said one spring during ñnal closing
movement of said door member with respect to said jamb
cooperating jamb member, and in which one of said mem
member.
bers is provided with a rigidly mounted keeper element,
3. In a latch mechanism for latching a door member
the improvement of a friction catch, said improvement
mounted for opening and closing movements relative to
comprising supporting structure rigidly secured to the
other of said members, a pair of elongated coil springs 20 a cooperating jamb member, and in which said jamb
member is provided with a rigidly mounted keeper ele
carried by said supporting structure with their respective
ment, the improvement of a friction catch, said improve
end portions iixedly disposed with respect to said other
ment comprising a supporting housing rigidly secured to
of said members, said springs being disposed in one con
said door member, a pair of elongated coil springs carried
dition in generally laterally spaced generally parallel rela
tionship with one another, said coil springs when in said 25 by said supporting housing with their respective end p0r
tions ñxedly disposed with respect to said door member,
one condition being so orientated that one of said springs
said springs being disposed in one condition in generally
is engaged by said keeper element during initial opening
laterally spaced generally parallel relationship with one
movement of said door member with respect to said jamb
another, said coil springs when in said one condition being
member so that lateral deflection is imparted to said one
spring, and a movable abutment element mounted on said 30 so orientated that one of said springs is engaged by said
keeper element during initial opening movement of said
supporting structure for movements toward and away
door member with respect to said jamb member so that
from said other of said springs between a spaced posi~
lateral deñection is imparted to said one spring, and an
tion in spaced relationship to said other of said springs
abutment-surface-deñning slide element mounted on said
and an engaged position wherein said abutment element
is disposed in engagement with a generally intermediate 35 supporting housing for movements toward and away from
said other of said springs between a spaced position in
portion of said other of said springs so as to displace said
spaced relationship to said other of said springs and an
intermediate portion of said other of said springs into
engaged position wherein the 'abutment surface of said
engagement with said one of said springs and thereby
slide
element is ydisposed in engagement with a generally
define a second condition of said springs, said coil springs
intermediate portion of said other of said springs so as to
when in said second condition being so orientated that 40
displace said intermediate portion of said other of said
said one spring is engaged by said keeper element during
springs into engagement with said one of said springs and
initial opening movement of said door member with
thereby define a second condition of said springs, said
respect to said jamb member so that concerted lateral
coil springs in said second condition being so orientated
deñection is imparted to both of Said coil springs during .
that said one spring is engaged by said keeper element
said movement, whereby the force required to deflect
during initial opening movement of said door member
both of said springs and open said door member when
with respect to said jamb member so that concerted lateral
said springs are in said second condition is materially
deflection is imparted to both of said coil springs during
greater than the force required to deflect said one spring
said movement, whereby the force required to deilect
and open said door member when said springs are in said
50 both of said springs and open said door member when
one condition.
said springs are in said second condition is materially
`2. In a latch mechanism for latching a door member
greater than the force required to deflect said one spring
mounted for opening and closing movements relative to
and open said door member when said springs are in said
a cooperating jamb member, and in which one of said
one condition.
members is provided with a rigidly mounted keeper ele
4. The structure defined in claim 3 in which the orienta
ment, the improvement of a friction catch, said improve 55 tion of said coil springs when the same are in a selection
ment comprising supporting structure rigidly secured to
of said one condition and said second condition is such
the other of said members, a pair of elongated coil springs
that lateral deflection is imparted only to said one spring
carried by said supporting structure with their respective
during íiual closing movement of said door member with
end portions iixedly disposed with respect to said other of
respect
to said jamb member.
said members, said springs being disposed in one condi 60
5. In a latch mechanism for latching a door member
tion in generally laterally spaced generally parallel rela
mounted for opening and closing movements of its free
tionship with one another, said coil springs when in said
edge relative to a cooperating jamb member, and in whichV
one condition being so orientated that one of said springs
said jamb member is provided with a rigidly mounted
is engaged by said keeper element during initial opening
movement of said door member with respect to said jamb 65 keeper element, the improvement of a friction catch, said
member so that lateral deñection is imparted to said one
spring, and a movable abutment element mounted on said
supportinU structure for movements toward and away
improvement comprising a supporting housing rigidly
secured to said door member, a pair of elongated coil
springs carried by said supporting housing with their re
spective end portions iixedly disposed with respect to said
from said other of said springs between a spaced position
in spaced relationship to said other of said springs and 70 door member, said springs being disposed in one condition
in generally laterally spaced generally parallel relationship
an engaged position wherein said abutment element is
disposed in engagement with a generally intermediate
with one another, said coil springs when in said one con
portion of said other of said springs so as to displace said
dition being so orientated that one of said springs is
intermediate portion of said other of said springs into
engaged by said keeper element during initial opening
engagement with said one of said springs and thereby 75 movement of said door member with respect to said jamb
3,037,801 '
8
member so that lateral deñection'is imparted to said
one spring, an abutment-surface-deñning slide element
mounted on said supporting housing for movement to
lward and away from said other of said springs between a
spaced position in spaced relationship to said other of
ment comprising a supporting housing rigidly secured to
said door member, a pair of elongated coil springs carried
by said supporting housing on the side thereof disposed
adjacent the free edge of said door member and with
the respective end portion of said coil springs being
said springs and an engaged position wherein the abut
fixedly disposed with respect to said door member, said
ment surface of said slide element is disposed in engage
springs being disposed in one condition in generally later
ment with a generally intermediate portion of said other
'ally spaced generally parallel relationship with one an
of said springs so as to displace said intermediate portion
other, said coil springs when in said one condition being
of said other of said springs into engagement with said one
soorientated that one of said springs’is engaged by said
10
of said springs and thereby denne a second condition of
keeper element during initial opening movement of said
said springs, and yielding means associated with said sup
door member with respect to said jamb member so that
porting housing and said slide element for biasing said
lateral deflection is imparted to said one spring in a
slide element toward said engaged position thereof, said
direction, generally toward said spaced other spring, an
coil springs when in said second condition being so
abutment-surface-deñning slide element mounted on said
orientated that said one spring is engaged by said keeper
supporting housing for movement toward and away from
element during initial opening movement of said door
said other of said springs between a spaced position in
member with respect to said jamb member so that general
spaced relationship to said other of said springs and
ly concerted lateral deflection is imparted to both of said
an engaged position wherein the abutment surface of said
coil springs during said movement, whereby the force
slide element is disposed in engagement with a generally
required to deñect both of said springs and open said 270 intermediate portion of said other of said springs so as
door member when said springs are in said second con
to ldisplace said intermediate portion of said other of said
dition is materially greater than the force required to
springs into engagement with said one of said springs and
deñect said one spring and open said door member when
thereby define a second condition of said springs, and
said springs are in said one condition.
yielding means associated with said supporting housing
25
6. The structure defined in claim 5 in which the
and said slide element for biasing said slide element to
orientation of said coil springs when the same are in
ward said engaged position thereof, said coil springs when
a selection of said one condition and said second condition
in said second condition being so orientated that said one
is such that lateral deñection is imparted only to said
spring is engaged by said keeper element during initial
one spring during íinal closing movement of said door
opening movement of said door member with respect to
30
member with respect to said jamb member.
said jamb member so that said one spring is deflected
7. The structure defined in claim 5 in which said sup
and said deflection is imparted to said engaged interme
porting housing has opposite sides, said elongated coil
springs being carried by said supporting housing on the
side thereof disposed adjacent the free edge of said door
diate portion of saidïother spring so as to move said
intermediate portion of said spring 4along the abutment
surface
of said slide element during said initial opening
member, and in which said yielding means comprises: 35 movement, whereby lthe force required to `deflect both of
a dog defined by said slide element and projecting into
said springs andv open said door member when said
said supporting housing; aV deten-t defined by the side
springs are in said second condition is materially greater
of said housing opposite the side thereof which carries
than the force required to deflect said one spring «and
said elongated coil springs; and a compression spring in
said door member when said springs are in said one
40
terposed between said dog and said detent and disposed
condition.
'
with its axis in general normality to the axes of said elon
gated coil springs.
v
8. In a latch mechanism for latching a door member
mounted for opening land closing movements relative Y
to a cooperating jamb member, and in which said jamb
_ member is provided With a rigidly mounted keeper ele
ment, the improvement of a friction catch, said improve
References Cited in the tile of this patent
UNITED STATES PATENTS
2,931,675
2,957,719
Coulson ____________ _- Apr. l5, 1960
Hafstad ______________ __ Oct. 25, 1960
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