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Патент USA US2106955

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Feb. l, 1938.
D. D. MCA. Mor-'PITT
2,106,955
LOCK
Filed Aug. 25, -1.9556
2 Sheets-Sheet 2
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2,105,955
UNITED STATES PA'IV‘ENT*> AOFFICE
Patented Feb. 1, 1938
2,106,955
LOCK
Duncan Douglas McArthur Moffitt, Arapito,
Westport, New Zealand, assigner to The Mof
iitt Automatic Lock Company Limited, West
port, New Zealand, a corporation of New Zea
land
Application August 25, 1936, Serial No. 97,837
In New Zealand October 21, 1935
(Cl. 292-335)
6- Claims.
Figure 7 is an elevation partly in section of
a slightly modiñed form of the lock.
Figure 8 is a similar view showing the position
This invention relates to latches for doors,
and in particular motor Vehicle doors and the
like.
The object of the present invention is to en
5 able the latch bolt to be withdrawn and held
clear of the face of the door, and to be released
when the door is closed.
According to the present invention, a latch
of the parts during the opening operation.
Referring to the drawings, and first to Figures
l to 5, a latch rod I has a latch bolt 2 with a
conical engaging endto enter a conical recess
in a socket 3 within the frame 4, the bolt 2 and
the rod I being adapted to be projected forward
bolt is formed on the end of a latch rod slideable
into the recess by means of a coil spring 5 in com
pression between a pin and washer 6 on the latch
in the latch casing, and normally tends to be pro
jected forwardly into engagement with a recess
in the frame, while manual means are provided
to retract the rod and bolt. A releasing rod
r projects through the hinged end of the door and
»is under tension of a spring which normally
tends to project the releasing rod in a rearward
position, so that as the door is opened this rod
moves rearwardly. A retaining pawl is pivoted
in the casing and is adapted to engage and retain
10
rod I and a part 1 of the lock casing, through
which the end of the rod I is guided. The other
end forming the latch bolt 2 is guided in a socket
8 ñtted into an end member 9 of the door. In
some cases the socket may form part of the lock
casing. A lever I0 is fixed on a cross member
or bar I I, to which handles I2 (see Figures 4 and
6) are secured upon the exterior of the door. 20
This bar II is pivoted in the sides I4 and I5
« the latch rod in a retracted position, means
forming the lock casing, these sidesY being ñxed
to the part 1 and to transverse parts I6 and I1.
being provided so that when the door is un
latched, the retaining pawl will be actuated
The lever I0 has pivoted on its upper end a pawl
through the medium of the releasing rod to en
gage the latch rod, but when the door is closed, . I8 adapted to engage a shoulder I9 on the ro-d 25
I. A coil spring 2li, attached to the lever I0 and
such releasing rod will again actuate the retain
ing pawl in order to disengage it from the latch anchored at a convenient point on the member
rod and permit such rod to be projected forward 9 of the door, tends to retain the lever in the posi
tion shown in Figures 1 and 3. A retaining pawl
under the pressure of its spring.
2l is pivoted to the casing on a pin 22 which
In one form, a trip member is provided which
traverses the sides I4 and I5, the other end of 30
30 is pivoted to the releasing rod, and adapted to
fall into alignment with the said rod, and with the pawl being pivoted to the end of a rod 23
a rod controlling the pawl, this trip member being slideable in the part I1. of the casing, and herein
raised when the handle is initially turned in referred to as a pawl rod. 'I'he end of the pawl
order to» permit the retaining pawl to engage the 2| is adapted to engage a shoulder 24 on the
latch rod, but returns into position on the release rod I. A releasing rod 25 slideable in the part 1
and in the end member 26 of the door, is nor
of the handle, so that when the door is being
mally adapted to be projected rearwardly by a
coil spring 21 in compression between the part
closed, the releasing rod will, through the medi
um of the trip member, actuate the pawl and so
release the latch rod.
40
1 and a washer 28 and pin 29. A trip arm 30,
pivoted to the releasing rod 25, is adapted to 40
align with the pawl rod 23 and with the releas
ing rod 25, and is normally retained in alignment
In another form, the retaining pawl is simply
pivoted to a rod which is in turn pivoted to the
releasing rod, the opening of the door enabling
the releasing rod to o-perate the pawl to engage
by a ñat spring 3| fixed to the rod 25 and bearing
on the trip arm 30.
The rear end of the releasing rod 25 passes
the latch rod, but the closing of the door causes
' the releasing rod to disengage the pawl and per
through the end member 26 and is adapted to
mits the latch rod to be projected forward into
strike the member 32 of the door frame, or an
position.
adjustable stop 33 set therein.
A coil spring 34 around the pawl rod 23 is in
compression between the part I1 of the casing
The invention will be described with the aid of
the accompanying drawings, wherein:
Figure l is a side elevation partly in section
of the lock.
Figure 2 is a similar View but showing the posi
and a washer 35 held against a pin 36. The hole
in the part I1, through which the pawl rod passes,-
tion of the parts during the unlatching operation.
Figure 3 is also a similar View showing the posi
tion of the parts when the door is being opened.
Figure 4 is a cross section on line A-A Fig
ure
l.
'
`
Figure 5 is a cross section on line B-B Fig
ure l.
60
Figure 6 is a plan showing a door partly open.
is slightly larger than the rod, so that a little
vertical movement of the pawl rod can take place
to permit the arcuate movement of the pawl 2I.
A bell crank lever 31 forms a trip lever and is
pivoted on a pin 33 in the sides I4 and I5 of the
casing. This trip lever is shown in Figure 5
bifurcated, the ends of the forks 39 thereof hav
ing a pin 40 which will engage under the trip GO
2
2,106,955
arm 30. The other end of the trip lever is con
nected by a link 4| to the lever I0.
means to retract said latch rod, a releasing rod
projectable through the hinged edge of the door,
In operation, assuming that the door has been k a spring to retain said releasing rod in projected
closed and the locking bolt is in position, as 'inl position, a retaining pawl pivoted in said casing
Figure l, in order to retract the latch bolt 2 to> toA engage and retain said latch rod retracted, a
open the door, a handle I2 is operated, and the pawl rod pivoted to saidl retaining pawl and guided
lever I0 is moved back and carries the rod I
back> to the position shown in Figure 2, thereby
withdrawing the conically pointed. end 2 from
its recess in the frame. At the same time, the
coil spring 5 is further compressed. This move
ment also has caused the link 4| to operate the
trip lever 37 and will cause the trip arm 30 to
be moved out of alignment with the rodsf23 and
15 25, thereby permitting the rod 23 to travel rear
war-ds under the action of the coil spring 34', and
will cause the retaining pawl 2| to engage be
hind the tooth or shoulder 24> on the latch rod
I, and retain this'rod in its retractedposition.
' Upon the operator freeing the handle I2, the
Vlever I0 andpawl V| 8 will return, under the action
of the spring'20, back to the normal position, the
link 4| returning the trip lever as'shown in Fig
Yures lïandA 3, but the trip arm 30 would .re
25 main as in Figure 2. As the door is opened on
its hinges, it will move away from the frame
member 32l (see Figure 6) and the coil spring 2'!
will `cause the releasing rod 25-to slide through
the’fr'ame 2liy and-carry back with it the trip arm
3|), which will then fall into alignment with the
pawl rod 23, as shown in Figure 3. The rearward
movement of the rod 25 vwould be limited by a`
in alignment with> said releasing rod, means to re->
tract saidl pawl rodl rearwardly and operate said
retaining pawl to engaging position with said
latch rod, and meansvto disengage said retaining 10
pawl from said latch rod when said releasing rod
is moved forwardly upon the closing of the door.
2'. In> the latch as claimed in claim l, a pawl
rod pivoted. to said retaining pawl, and guided in
alignment with said'releasing rod, said pawl rod 15
pivoted to the forward end of said releasing
rod, so that when the door opens the saidwpawlî
is moved to enable Athe latch rod to engage it‘. `
3. In the latch as claimed in claim 1, a guide
for said pawl rod allowing only a slight amount of 20
free vertical movement to provide for therarcuate
movement of said retainingrpawl.
4. In a latch for doors, a casing, a latch rod
slidable in said casing, an engaging end to said
latch rod, a spring normally tending to project
said latch rod forwardly intoengaging position,
means to retract lsaid latch rod, a releasing rod
projectable through the hinged edge of the door, a
spring to retain said releasing rod in a projected
position, a retaining pawl pivoted in said >casing 30
to engage and retain said .latch rod retracted, a
pawl rod pivoted to said retaining 'pawl and
collar- or washer 42.
Y
Y
'
'
Vguided so as to be moved forwardly by the said re
When the door is being closed, upon the'rear ' leasing rod to disengage the pawl from said latch
35 end of: the releasing Yrod 25 striking the frame or
stopV 33,'the trip arm 30’ will be forced forward
and in turn will force forward Vthe pawl vrod 23
and thus rotate the retaining pawl 2| backto the
rod wheny the door is being closed, andY means 35
whereby said pawl rod will permit the pawl to en~
gage said latch rod upon the retracting move-A
ment of said latch rod independent of movement
`position shown in Figure l', such movement disen- Y of the releasing rod.
Y Y
40 gagingY it from the shoulder 24; the rod | moving .
5. A .latch as claimed in claim` I, a spring to 40
back a little forv this purpose. Once the rod' | is retractrvsaid pawl rod rearwardly and operate said
released, it will, under the pressure of its coil
spring 5, be shot forward and the conical end 2
will enter the conical recess in the socket 3, and
45 the mechanism will then assume the position
shown in Figure' 1.
'
v
'I'he conical end of the bolt 'ensures that any
play will be taken up and will thus prevent any
tendency to rattle or looseness.
In Figures 7 and 8, a modification is shown, in
Y50
that the trip arm >3|) with the trip lever is elim
inated, the pawl rodv 23 being pivoted to the re~
leasing rod` 25'.
'
l
ries back the rod I as before. ~ In this case, the
handlev would be retained inthe drawn~back po-V
sition until the conical end of the bolt 2Qis clear
Y60 of the socket, by which time the releasing rod
25 will have moved back far enough (as indicated
in Figure 8) to- raise the point of the pawl> 2|
toY engage the shoulder 24. When the door is be
ing closed, however, the releasing rod 25 will push
65 forward the pawl rod 2'3-and will cause the re
taining pawlr 2| to disengage from the shoulder
‘
'
What I claimV isr-
-
Y
rod to disengage- said retaining pawl from the 45
said latch rod when saidy releasing rod is moved
forwardly upon the closing of the door, and means .
to raise said trip arm out ofralignment with Said
pawl> rod to permit said pawl rod to move rear
wardly and acuate said retaining pawl to en-» 50
gage'said latch rod, said trip arm adapted to
return into alignment with the pawl rod when
the door is opened.
In this case, the operation is that when the
55 handle I2 is` rotated, theY lever I0 operates the
pawl I8 which will engage the tooth I9 and car-V
24
retaining pawl to engaging position with said
latch rod, a trip arm pivoted to said ,releasing rod
and- adapted to fall into alignment with said pawl
'
6. A latch as claimed .in claim 1, a spring to .
retract said pawl rod rearwardly and operate
said retaining pawl to engaging position with
said latch rod, a trip arm pivoted to said releas
ing rod and adapted to fall into alignment with
said pawl rod to disengage said retaining Vpawl
from the said latch rod when said releasing rod
is moved forwardly upon the closing of the door. '
a trip lever pivoted in said casing, and forming a
support for the trip arm, and adapted to raise
said trip varm out of alignment with said'pawl
rod, a link connecting one end of said trip lever 65
to the means for retracting said latch rod, so that
as the latch rod is retracted and said trip arm
Y
‘
, 1. In a latch for doors, acasing, a latch rod
70 slidable Yin said casing, an engaging end to said
rod, a spring normally tending to project said
`latch rod forwardly into engaging position,
raised out of Yalignment said pawl rod is per
mitted to move rearwardly and actuate saidY re
taining pawl.
DUNCAN DQUGLAS MCARTHUR MOFFI'I'I‘.
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