Note: Descriptions are shown in the official language in which they were submitted.
~2~4~
The present application is a divisional of Canadian
Patent application Serial No. 316,229 filed November 14, 197~.
The present invention relates generally to the
field of locks.
~leretofore, it has been known generally from
U. S. Patent Nos. 2,854,839; 3,695,068 and 3,899,906
to provide locking mechanisms of the pivoted or swinging
bolt type for mounting in the narrow stile of a door,
and the present invention cons-titutes an improvement,
over the lock mechanisms disclosed in these patents.
The mechanism in the above-mentioned U. ~, Patent
2,854,839 disclosed an early concept in -the development
of a narrow stile mountable lock of a type which produced
features which permitted the obtainment of maximun
security. This lock utilized a relatively long
main bolt actuating lever which was pivoted at one end
and connected at its other end to the lock bolt, the
lever mounting a releaseable detent latch between its
ends which cooperated with adjacently disposed slots to
provide the deadlocking operations of the main bolt. This
lock was limited for use with key-actuated lock cylinder
assemblies of the casement type, and which are
threadedly secured to a side plate of the lock mech-
anism casing. A notable advantage of -the lock mech-
anism as disclosed in this patent resides in -the design
arrangement wherein the swingable end of -the actuating
lever that is connected to the main bolt is in a con-
figuration which permits the bolt-connected end to
move symmetrically to positions lying on opposite sides
of a center line connecting the pivots of the actuating
- 2 - ~ ~ X ~
arm and the main bolt, and thus contribute to a desir-
able and effective distribution of the operating forces.
In the later U. S. Patent No. 3,695,068, the
operating advantages of the preceding pa~en~ have becn
retained and incorporated into an improved combination
locking and latchin~ assembly which is similarly
adapted for narrow stile mounting. In the combina-
tion locking and latchin~ arrangement of this patent,
the latch member is spring-urged to a latche~ position
and is independently operable by a latch handle, knob
or the like to an unlatched position, while the locking
bolt is arranged to be actuated in a normal manner by
a key-actuated cam, the key-actuated cam being further
operable, in an unlocked position of the main locking
bolt, to move the latch member to a retracted or un-
latched position.
Both of these patents, therefore, were limited
to the use of the casement type of key-actuated lock
cylinder assemblies. At a more recent date, the cam
actuator of the insert type was gaining favor in many
countries of the world, and the lock mechanism of U. S.
Patent 3,899,906 is designed to take advantage of the
features of the insert type of cam actuator. In the
lock mechanism of this patent, the configuration of
the bolt actuating lever was changed to make use of
a rocker lever instead of an actuating lever which was
pivoted at one end. ~his change had the manifest ad-
vantage of permitting the use of the insert type of cam
cylinder assembly, but because of the particular type
of releasable latch mechanism for operation by the cam
arm, the movement of the end of the rocker arm, which
is connected to the swingable bolt, departed somewhat
from those of the previous patents in that the arm did
not move to limit positions which were symmetrically
and substantially equally disposed on opposite sides
of a center line connecting the arm and bolt pivots.
-- 3
In accordance with the features of the present
invention, it is proposed to modify the structure of
the actuating lever for the main bolt, and utilize a
new escapement concept at the end of the roclcer arm
which is associated with the ac~uating cam, so that in
effect, the end of the rocker arm which is connected
to the main bolt will be moved or swung to positions
symmetrically disposed on opposite sides of a center
line connecting the bolt and actuating lever pivots,
during actuation of the main bolt between its un~
locked and loc~ed positions. A unique escapement
conceptl which may be referred to as the "EADS" es-
capement, has additional a~vantages over the previous
arrangements in that it utilizes an end projecting
arm which is engageable by the actuating cam arm during
the operation of the locking mechanism. Thus, by
utilizing the engagement of two "male" members rather
than an arrangement in which the camming arm or single
male member must be moved into a recess of the like
of a "female" member, it is possible to uitilize a
variety of camming members which may vary considerably
in their dimension.s.
Another feature of the present invention resides
in the arrangement of an interrelated latching mechanism
for operation with the new actuating arm and escapement
concept of the present invention.
The present invention relates generally to lock
mechanisms and is more particularly concerned with im-
provements in the ~means for actuating and controlling
the main lock bolt and an associated latch bolt for
use in doors having a narrow stile.
Brief Description of the Drawings
Referring to the accompanying drawings, which
are for illustrative purposes only:
Fig. 1 is a perspective view of a locking mechanism
9L8
-- 4
embodying the features of the present invention;
Fig. 2 is a longitudinal sectional view,
taken substantially on line 2-2 of Fig. 1, showing the
cooperative relationship of the lock components, the
main bolt being in extended locked position;
Fig. 3 is a view similar to Fig. 2, except that
the bolt is shown in retracted unlocked position;
Fig. 4 is a long;tudinal sectional view, taken
substantially on line 4-4 oE Fig. 3;
Fig. 5 is an enlarged fragmentary transverse
sectional view, taken substantially on line 5-5 of
Fig. 3, showing details of the rocker lever and the
escapement;
Fig. 6 is an enlarged fragmentary perspective
exploded view, showing the components of the Eads es-
capement;
Fig. 7, 8 and 9 are enlarged fragmentary trans-
verse sectional views respectively illustrating the
operative positions of the excapement mechanism in the
unlocked, intermediate and locked positions of the main
bolt;
Fig. 10 is an enlarged transverse sectional view
showing the operative relationship of the slide stop
and cam extension;
Figs. 11 and 12 are enlarged fragmentary trans-
verse sectional views respecti-vely showing the operative
relationship of the latching mechanism with the latch
bolt in extended and retracted positions;
Fig 13 is a view similar to that of Fig. 12, and
showing the operative position of the latch actuator
bar in shifting the latch bolt from the latch position
shown in Fig. 11, to an unlatched position; and
Fig. 14 is a fragmentary sectional view showing
the operative relationship of the Latch bar and associ-
ated dogging cam.
3Z~4~
-- 5
Description of the Preferred EmbodimentMain Locking Mechanism
For illustrative purposes, there is disclosed in
Fig. 1 a lock casing which is designated generally by
S the numeral 10. This casing is stamped or otherwise
formed to provide companion sections which are stacked
or otherwise interconnected to form a substantially
closed housing within which the locking mechanism is
contained between side wall portions 12 and 14, At
the forward side of the casing, a face plate 16 is
arranged for attachment by means of suitable screws
18 to associated casing lugs 20. Thus the face plate
is formed to provide a rectangular slot or opening 22
~or a main locking bolt 24, and an adjacent slot or
opening 26for alatching bolt 28. It is to be under-
stood that the main bolt 24 and latching bolt 28, in
their locked and latched positions are adapted to be
associated with appropriate keepers mounted on an
associated door jam or other door.
The main bolt 24 is preferably of laminated
construction and consists of a plurality of metallic
plates 30 secured in overlying or stacked relation by
means of suitable rivets 32 or other conventional means.
While the main bolt has in this instance been illustrated
as of the straight type, it is contemplated that thisbolt may, if desired, be of the hook type. The bolt is
pivotally mounted for swinging movements through an
angle o~ substantially 90 between its extended locked
position and retracted unlocked position, a pivot pin
34 being positioned to extend through the inner end of
tlle bolt and have its opposite ends rigidly supported
in the side walls 12 and 14, respectlvely, of the casing.
The main locking bolt 24 is provided at its inner end
with transversely aligned L-shaped slots 36 with
dwell positions at their ends, as indicated by the
~ ~ 2 ~ ~ 8
-- 6 --
numerals 38 and 40, respectively. The slot 36 is ori-
ented so that its long leg extends generally in a radial
direction from the pivot pin 34.
The bolt 24 is arranged to be actuatecl between
its retracted unlocked position and extended locked
position by means of an actuating rocker lever 42 which
extends generally in a longitudinal direction of the
casing 10 and is supported between its ends on a pivot
44 for a rocking movement. One end of the lev~r 42
mounts a transversely extending pin 46 having its ends
respectively positioned on opposite sicles of the lever
and extending into the bolt slots 36,36 for movement
therein. The rocking movement of the lever is thus
constrained, and the slots 36 are so shaped as to
accommodate relative movements of ~he pin and the bolt
during operative movements of the actuating lever in
moving the bolt between its retracted and extended
positions. As shown, the ends of the pin 46 are also
positioned for movement respectively in transversely
extending arcuate guide slots 48 formed in the opposite
side walls 12 and 14 of the casing. As thus arranged,
the movements of the pin 46 to the opposite ends of the
slots 48 operate to dog the main bolt 2~ in a dead-
locked position at its unlocked and ]ocked positions,
respectively.
As generally indicated in ~igs. 2 and 3, the
opposite end of the rocker lever 42 carries an ~ads
escapement mechanism as generally indicated by the
numeral 50, which is operatively associated with a key-
controlled lock cylinder 52 of the inser-t type rather -
than the casement type which is threadedly mounted in
the casing of the lock mechanism. As shown, the lock
cylinder has a body structure of genera]ly keyhole
configuration, the body having a cylindrical portion
~4 and a radially extendin~ depending projecting portion
~2~
-- 7
56. The body portion is insertible endwise through
aligned keyhole-shaped openings 58, respectively formed
in the side walls 12 and 14 of the casing 10. In its
operative posi,tion, the lock cylinder assembly has a
S projecting portion 56 secured to an upstanding lug 60
by means o.E a retaining screw 62 which is insertable
throu~h an opening in a frontwall portion 64 of the
casin~.
The lock cylinder assembly includes a ro!~atable
member 66 which carries a radially projecting cam
extension arm 68 having a path of movement which
passes through an opening 70 in the projecting portion
56 during its movement from one side to the other of
the assembly body. Actuating forces will be applied
to the escape~ent mechanism 50 in a manner to operate
the main bolt through rocker lever 42 in a manner to
move the main bolt between its ~mlocked an(l locked
positions of operation, in a manner which will here-
inafter be explained more fully.
The "Eads" Escapement Mechanism
The escapement mechanism 50 is an important feature
of the herein disclosed invention which provides improved
operating features which contribute to a balancing of
operating forces in a manner to augment and enhance the
maximum obtainable security features of the locking
mechanism. Further, the escapement is such that the
opposite end of the rocker le-ver 42 will be varied
during its operation so as to automatically vary the
mechanical advantage of the rocker lever and provide
increased leveragè when moving the main bolt out of its
unlocked and locked positions. Also, the escapement
is such that a variety of cam extension arms 68, may
vary considerably as to their di.mensions, and operate
~ith complete effectiveness to move the rocker lever
as necessary to change the position of the main bolt
41~
- 8 -
between its unlocked and locked positions. These
features will become more evident during the following
description of the escapement mechanism.
More speci~ically, as shown in Fig. 6, the oppo-
site end of the rocker arm 42 is ~abricated to providea pair of laterally spaced projecting parallel arms
72, 74 which coact to provide an axially extending open
ended slot 76. The arms 72 ancl 74 are arranged to
guidingly support escapement sl:idc meml)er 7~ ltlereo
for reciprocal sliding movements between lnner and
outer limit positions.
The escapement slide member 78 comprises a gen-
erally rectangular body head portion 80 with integrally
formed spaced lugs 82 having axially extending guide
1.5 slots 84 having aligned registration and being adapted
to receive the pivot 44 therethrough for guided move-
ment axially thereof. The parallel arms 72, 74 are
arranged to extend respectively through guiding channels
86 positioned between the lugs 82, 82 on opposite sides
of the ~uide slots 84. The ends of these arms will po-
trude through an end opening 88 (Fig. 7) in a trans- --
versely extending abutment fac:e 90, when the escapement
slide member 78 is moved to its inner limit position
on the arms 72, 74. A pair of coiled compression springs
92 on opposite sides o~ the arms 7~, 74 are arranged
with one end in anchored relation to a retaining pro-
jection 94 on the rocker lever 42, while the other end
is arranged to be seated in a recess 96 in the head
portion of the escapement slide member 78. With such
an arrangement, it will be evident that the springs
92 will normally urge the escapement slide member
towards its outer limit.
An escapement release member 98 of generally
T-shaped configuration is operatively associated with
the head portion ~0 of the escapement slide member and
g ~ 8
is composed of an axially extending projecting arm
portion 100 which is connected with spaced cross members
102, presenting transversely extending abutment faces
104. These abutment faces are arran~,ed to normally
engage the abutment Eace 90 of the escapement slide
member 78, and between their encls are provided with
spaced bearing shou].ders 106 which are adapted to seat
in axially positioned receiving~ recesses lO8 in the
abutment face 90, to normally maintain the es~apement
slide member 78 and escapement release member 9~ in
axially operative engagement. '.L'he escapement release
member 98 is also supported ~or relative pivotal move-
ment with respect to the esca~)elllell~ s.Lide mcmber 78
by means of a pivot member 110 having its opposite
ends supported for guided lateral movemenLs within
transversely registering inverted V-slots 112 formed
in the casinU side walls 12 and 14. When the escapement
slide member 78 and the escapement release member 98
are in axially aligned engagement with the bearing
shoulders 106 in the receiving recesses 108, the es-
capement slide member 78 and the escapement release
member 98 are coupled for a unitary movement between
inner and outer limit positions of the escapement slide
member. Upon movement of the coupled escapement members
from the outer lilllit pOSi~iOIl L~wards the inner limit
position, the parallel arms 72 and 74 will straddle a
central wall portion 114 between the cross members
102 and thereby interlock the escapement members so as
to prevent relative pivotal movement of the escapement
release member with respect to the escapement slide
member 78. l-lowever, when the escapement members are
moved to the outer limit position, the parallel arms
72, 74 will be disengaged with respect to the central
wall portion 114, and in such case enable relative piv-
otal movement of the escapement release member 98 in
- 10 -
a manner such that the escapement slide member will
be urged axially away from the escapement release
member by the camming action of the cross members
102,
The operation of the escapement mechanism 50
is best shown in Yigs. 7, 8 and 9 of the drawings.
In Fi~. 7, the pos~tion of the rocker lever 42 with
the escapement mechanism is shown for the position '
i.n which the main bolt 24 is in an unlocked p(~sition.
In this position, it will be seen that the rocker
lever 42 is upwardly inclined to the right and that
the pivot member 110 of the escapement release member
98 will be disposed at the bottom of the left leg of
the V-slot 112. In order to actuate the main bolt 24
to a locked position, the cam extension arm ~)8 will
be rotated in a clockwise direction. This ro~ Lion
will bring the cam extension arm into engagenlent with
the outer end of the arm portion 100. It will be ob-
served that the position of the arm 100 is such that
the cam extension arm 68 will apply a predominant axial
acting force against the arm 100, which will be effec-
tive upon continued movement of the cam 68 to move thc '
pivot 110 to a mid-operating position as shown in
Fig. 8, and at the,same time activate the main bolt
to a mid-position. During this movement, the escape-
ment release member will be interlocked against pivotal
movement with the arms 72, 74. The arm 100 will also
have moved ina radial direction towards the pivot 44
against the action of the springs ~2. During this
action, the arm 100 will have moved from its maximum
extended position in which the mechanical force of
the rocker lever 42 will be the greatest with respect
to the operation of the main bolt 24.
At the mid-position, as shown in Fig. 8, the
cam extension arm 68 will now engage the side portion
2~8
o the end of arm 100 so as to apply a predominant
lateral force against the arm and move it into the
downwardly inclined right leg of the V-slot 112, the
arm now belng so positioned with respect to the cam
extension arm that the urging force of the spri.ngs
92 is now effective l.o complete the movement oE the
pivot member 110 to- the right bottom end of the slot,
and during thls movement operate to cam the rocker
lever to an inclined position to ~ile left, as ~ own
in Fig. 9, in which the main bolt will be in its
locked position.
Referring further to Fig. 9, it will be seen that
in this position, the arm 100 is clisposed in a block-
ing position to the further movement of the cam ex-
tionsion arm 68. ~lowever, the escapement releasemember 98 is at its outer limit or escapement opera-
tive position, since it is no longer in locked engage-
ment witlr the arrns 72, 7~. At Lhis time, reverse
movement of the cam extension arm 68 is prevcnted by
an abutment projection 116, butmov~.ent of the cam
extension arm in a clockwise direction may now be
permitted by the pivotal action of the arm portion
100 which will be moved to the escapement position
shown in phantom lines and permit passage of the cam
extension arm. During t~le escapenlerlt nlovement oL the
arm 100, it will be seen that the escapement release
member 98 will be pivotally tilted and cam the escape-
ment slide member 78 towards its inner position against
the action of the springs 92. Upon passage of the cam
extensi.on arm 68, the arm 100 will be urged back into
its axial position as shown in full lines, where it
will be engaged by reverse rotation of the cam exten-
sion arm 68 to apply a predominant axial acting force
to shift the main bolt from its locked to unlocked
position by a reversal of the operations previously
described for moving the main bolt from its unlocked
~z~
- 12 -
to fully locked position.
As best shown in Flgs. 1, 2 and 4, an internal
barrier 118 is mounted within the lock casing to prevent
the insertion of a probe or other instrument through
the slot or opening 22 and the surreptitious operation
of the escapement mechanism in a manner to effect
operation of the main bolt. The barrier 118 has end
projections 120 which are adapLe~l to seat in receiving
openings 122 in the side walls 1? a~ Or ~ casin~,.
The Latching Mechanism
The latch bolt 28 and its connected operating
mechanism, as generally lndicated by the numeral 124,
are shown as being located in a position above the main
bolt 24. ~s best shown in Figs. 11, 12 and 13, latching
mechanism comprises an actuator rocker lever 126 w~ich
is supported intermediate its ends by a fixed pivot
128 having its opposite ends respectively supported in
the casing side walls 12 and 14. One end of the rocker
lever 126 is connected with the inner end of ~he re-
ciprocably mounted latching bolt 28, this end of thelever being provided with an end slot 130 which has a
connecting pin 132 movably positioned therein. Swinging
movements of the rocker lever 126 are operative to move
the latching bolt 28 between an extended latching posi-
tion (FiK. 11) and a fully rctrac~ed unlatched pOsiti(Fig. 12).
Provision is made for selectively opera~ing the
latch bolt by manual operable means at the latch bolt
position, as well as by the key means utilized for the
actuation of the main bolt 24. In the first of these,
there is provided a suitable hub member 134 which has
its respective ends rotatably supported in the side
walls 12 and 14 of the lock casing. This hub is provi-
ded with an internal bore 136 permitting splined con-
nection with a square shaft 138, as shown in dotted
L
- 13 -
lines, of an external knob, handle or other manually
operable exterior member (not shown).~
The hub member 134 has a pair of axially spaced
peripherally radially projectin~ lugs 140 and 142, and
which at their outer ends are bridged by a pin member
144. A pair of coiled springs 146 (Fig. 4) respectively
surround the outermost ends of the hub member 134, one
end of the spring in each case beinlT engage~ behind the
pin mèmber 144, an~ Llle o~ller ell~l bei~ engago~l with
an adjacent top end wall 148 of the casing. Thus, the
springs are tensioned ancl normally urge the hub member
134 in a clockwise direction of rotation, as seen in
Fig. 11, towards a stop position in which ~llc~ outer-
most end of the lugs 140 and 142 engage a stop which
may comprise a rear wall 150 of -the lock casing or
other appropriate supplemental stop means.
The opposite end of the rocker lever 126 is formecl
with a generally axially extending end projection 152
which is adapted for movement in the space between the
lugs 140 and 142, and is disposed in the path of move-
ment of the pin member 144, when the hub is rotated in
a counterclockwise direction. As will be clearly seen
in Fig. 11, the rocker arm 126 is normally urged in a
direction to move the latching bolt 28 to its latched
position by means oE a tension s~ring 15~l, onc~ en(l o~
the spring being anchored to the end wall 148, and
the other end being connected with alaterally exten-
ding projection 156 having substantially rlght-angled
relati.on to the end projection 152.
Operation of the latching bolt 28 by the key-
controlled lock cylinder 52, when the main locking
bolt 24 is in an unlocked position, is accomplished
by means of an elongate latch actuator bar 158 positioned
adjacent to and extending along the rear wall 150 of
the lock casing. The latch actuator bar is supported
for reciprocable movement between a lower position as
shown in phantom lines and a raised position as shown
Z~
in full lines in Fig. 13. The upper end of the latch
actuator bar 158 is deformed to provide a right-angled
end abutment 160 which is associated ~ith and adapted
to engage a projection 162 positioned on the opposite
side of the pivot 128 from projection 156. With the
arm 158 in its lower position, as shown in ~ig. 11,
the projection 162 is free for rotational movemcnt in
a clockwise direction durinF, o;)c~r.~ )r) of tl~ latching
bolt to a retracted unlatchcd posi.L:i.on l~y manu.ll ro-
tation of the hub member 134, as shown in Fig. 12. ~low-
ever, when the latch actuating bar 158 is raised to the
position shown in full lines in Fig. 13, the end abut-
ment will engage the projection 162 and rotate the
rocker lever 126 and move the latching bolt 2~ Lo un-
latched position, independently oE the hub member 134,as shown in Fi~,. 13.
The latch actuating bar 158 is constructed at its
lowermost end with a right-angled extending arm 164
which at its outermost end is arranged to swingably
support on a fixed pivot 166 a generally U-shaped
swingable bracket 168 having laterally spaced gene-
rally parallel arms 170 and 172 positioned in straddled
relationship with pivot 44 and the escapement mechanism
50, as shown in Fiyfs. 2 and 3. The bracket is arranged
to be shifted beLween all ~ngularl.y disposed po~ ion,
as shown in Fig. 2 and an axially aligned position with
respect to the latch actuator bar 158, as shown in
Fig. 3, by the swinging movement of an annular collar
174 at one end of .the pivot 110 into engagement with
inner edges 176 and 177 of the arms 170 and 172.,
respectively, during actuation of the main locking
bolt 24 to its unlocked and locked positions.
The arm 172 is formed witL~ an end ab~lLment 180
which is adapted in the angular position of the bracket
168 to occupy an ineffectual position out of the path
- 15 - ~ 8
of travel of the cam extension arm 68, as shown in Fig.
2. Thus, with the main locking bolt 24 in locked
position, the cam extension arm 68 is freely ~lovable
into engagement with the outer end of the arm portion
100 to effect actuation of the main locking bolt 24 to
its unlocked ~osition. ~lowever, as shown in Fig. 3, in
the locked position of bolt 24 the end abutment 180
will have been moved intc~ a posilion wlle-re :it will be
engaged by the cam extension arm 6~ upon rotatLon in
a counterclockwise direction, ancl raised to the dotted
line position, as shown, which will correspondingly
raise the upper end abutment 160 from its dotted line
position to a ~ull line position, as shown in Fig. 13,
to retract the latch bolt 28. ~ovement of the cam
extension arm from this position in a reverse direction
will permit the latch bolt 28 to be urged outwardly by
the spring 154 to its latched position.
As sho~n in Figs. 12 and 14, provi~sion i.s made ~or
dogging the latching bolt 28 into a releaseable unlatched
position by means of a dogging cam member 182 supported at
the inner end of a rotatable shank 184 which is rotatable
supported in a front casing wall member 186. The outer-
most end of the shank 184 is provided with a transverse
end groove 188 which is accessible to receive a scre~dri-
ver by means o~ wh;ch ~-he sllanlc~ y l)e rot-<lle(l lo ll~OV(` the
outer end of the cam member 182 into an arcuate recess
190 formed in the adjacent edge surface of the latching
bolt 28. The bolt will thus be held in its unlatched po-
sition, but ~lay be readily released by rotating the shank
184 so as to disengage the dogging cam, whereupon the
latching bolt will be automatically urged to its latching
position by the action of the spring 154.
~he Cam Slide Stop
The key-controlled lock cylinder 52 is so con-
structed that the key rnust be rotated 360 between key
- .~
- 16 -
removal positi.ons, while the lock mechanism is arranged
for movement between unlocked and locked positions by
key rotation of substantially 180. Provision is made
for preventing removal oE the key in a mid-position of
the main bolt, thus necessitating that the bolt be moved
to a fully unlocked or fully lock~d position I~I~ore the
key can be removed: As shown in l~ig. I.0, a flat plate
member 192 is slidably mounted ~or rcciprocal movements
in face engagement with the casing side wall l/..~. At one
end, the plate is formed to provicle a lon~,;tudinally
extending guide slot 194 for receiving the pivot 44
therethrough. The opposite end of the plate member is
U-shaped to provide parallel spaced apart arms 196 that
are in straddling relation to the rotatable member 66
of the key-controlled lock cylinder. The outer end of
each arm 196 is provided with an end abutment projec-
tion 198. These abutment projections are so arranged
that, when the plate member 192 is at its lowermost
position as shown in full lines in Fig. 10, the abut-
ments will be positioned out of the path of movementof the cam extension arm 68. This position of the abut-
ments corresponds to the unlocked and locked position
of the main bolt 24. tlowever, when tlne p].ate member
192 is moved to its raised posit.ion as shown in phantom
lines, which corresponds to a n~id-position of Llle nlLIin
bolt 24, the abutment projections will be disposed and
block the path of movement of the cam extension arm.
The plate 192 is raised and lowered in response to the
actuation of the main bolt 24 between its unlocked and
locked positions. The plate 192 is formed intermediate
its ends with a transversely extending slot 200 within
which there is movable positioned a collar 202 at the
adjacent end of the pivot member 110 of the escapement
release member 9~. Thus, as the pivot 110 is moved
from one end of the V-slot 112 to the other in going
- 17 - ~ ~Z~4~ -
from a fully unlocked to fully locked po~ition of the
main bolt, the flat plate member 192 will be accordingly
raised and low~red.
