Note: Descriptions are shown in the official language in which they were submitted.
~.23137~
The inventioll relates to a striking box for retaining the bolt of
a door lock, comprising a bolt stop, an activating device for movin~ the
bolt stop, a si~nalling switch and a mechanism mounted between the activating
device and the bolt stop which ensures that the movement o~ the bolt stop
is at first either prevented or delayed.
A striking box of this kind is known from Dutch Patent 152626.
In the known cons~ruction the mechanism comprises a toggle-joint
lever and the signalling switch is operated by the bolt stop.
This makes it possible, when the bolt stop is retracted, to insert
a piece of cardboard or a similar object in the striking box with the result
that, in the position blocked by the toggle-switch lever, the latter cannot
fully reach the rest position and the bolt stop is so close to its end
position that the signalling switch is operated. The striking box then
appears to be closed, but the bolt stop can be pushed back~ Besides abuse
as indicated~ accumulated dirt can also cause this condition.
The object of this invention is to eliminate this drawback, and
this has been achieved by providing a latch which is not directly connected
to the bolt stop and which is movable in a path crossing the path of
movement of the bolt stop to prevent movement of the bolt stop into an
inoperative position, the activating device and the latch being coupled and
one of the two operating in conjunction with the signalling switch.
The invention is not limited to a striking box in which the
mechanism is formed by a toggle-switch lever. Nor does the bolt stop
have to be movable backwards and forwards in a straight line in the same
- direction as the bolt when the door is being locked. In addition, the
bolt stop does not have to be shaped like a cage, which limitation
applies to the patent mentioned above.
~.23871
The activa-ting device preferably comprises a rotary magnet having
a crank coupling it to tlle bolt stop with space for motion. Accorcling to a
suitable embodiment, the bolt stop is a lever hinging in a :Eixed point.
The latch can be operated by an electro magnet which is
electrically coupled to the activating device. In a different embodiment
the latch has a rtm-on edge lying in t.he path of a crank of the activating
device and can be pushed away by the crank against the action of a spring.
The invention will be explained with the aid of the drawings
annexed, wherein
Figure 1 shows a cross section of a striking box with a swivelling
bolt stop in the closed and latched position;
Figure 2 shows the same in the closed and unlatched position;
Figure 3 shows the same in the open position;
Figure 4 shows a transverse section along IV-IV in Figure l;
Figure 5 shows a cross section of a striking box with a bolt stop
movable along a straight line;
Figure 6 shows a transverse section along VI-VI in Figure 5;
Figure 7 shows an embodiment without extra springs;
Figure 8 and
Figure 9 show two cross sections of the embo-liment shown in
Figure 7 along the lines VIII-VIII and I~ respectively.
Figures 1-4 show a striking box; in Figures 1-3 a side plate has been
3~7~
removed. To the right of front plate I is a closed door 2 with a door
lock having a bolt 3. In the closed position of the striking box the
bolt 3 is covered by a bolt stop formed by a lever 4 hinging on a
spindle 5. Lever 4 has a pin 7 which can operate together with a
swivelling latch 6. Latch 6 can operate a signalling switch 8. A
rotary magnet 9, the crank of which is formed by a flywheel 10,
constitutes the activating device operating lever 4 by means of a pin
Il on the flywheel engaging a hole 12 in lever 4 which hole leaves
space for motion of the pin ]1. Latch 6 is operated by flywheel 10 via
a pivot 13 and a link 14.
In the position shown in Figs. 1 and 4, the bolt stop keeps bolt
3 locked in. The bolt stop is locked in its place because latch 6 is
behind pin 7. Signalling switch 8 is open.
For opening the striking box9 rotary magnet 9 is energized.
Flywheel 10 starts turning counter-clockwise. This causes latch 6 to be
lifted via pivot 13 and link 14, so that pin 7 is released and
si-gnnlling switch-8 is closed. ~leanwhile, pin 1~ trayerses hole ~ while
lever 4 remains in its rest position. This situation is shown in Fig. 2.
Subsequently, pin 11 pushes lever 4 to the left against the action of
a draw spring 15, supported by the energy accumulated in flywheel 10.
Now the situation shown in Fig. 3 has arisen, in which bolt 3 is
unobstructed.
After door 2 has been opened the space containing the moving parts
is not accessible, owing to the presence of a cover ]6.
When the striking bo~ is closed again, lever 4 follows pin 11
under the influence of spring 15. Ater ~he lever has arrived in its
end position, link ]4 moves latch 6 behind pin 7 and switch 8 is opened.
In Figs, 5 and 6 the reference numbers for parts corresponding or
comparable with those in Figs. 1-4 have been obtained by increasing the
numbers in Fig. ] by 20.
Lever 4 in Fig. ~, which constitutes ~he bolt stop, has been
replaced in Fig. 5 by a bolt stop 24 movable in a straight line, which
1~;Z3~37~
is guided by rollers 38 in blocks 39 and 40. In the position shown in
Figs. 5 and 6 the striking box is closed; bolt stop 24 covers bolt 23
of door 22. Bolt stop 24 is blocked by a swivelling latch 26. This
latch works together with a signalling switch 28. The latch is pressed
against a pin 31 by a compression spring 41. Pin 31 is fitted on a crank
30 of a rotary magnet 29. It engages a hole 32 in link 42 fitted to bolt
stop 24, the hole leaving space for motion.
The operation of this embodiment is as follows.
For opening the striking box, rotary magnet 29 is energized, which
causes crank 30 to start turning clockwise. As a result, latch 26 is
pushed upwards via pin 3`1 and run-on edge 43 on the latch, whereby
switch 28 is closed while pin 3] traverses hole 32. Next, bolt stop 24
is moved to the right via link 42, the latch laying itself against bol~
stop 24 with run-on edge 43, and the bolt stop moving underneath the
run-on edge. The bolt is now unobstructed.
After door 22 has been opened the space containing the moving
parts is not accessible, owing to the presence of a cover 36.
Figs. 7, 8 and 9 show a third em~odiment of the device according
to the invention. This embodiment has no other springs than those in
the rotary magnet, which enhances the relia~ility and reduces the risk
of abuse and damage.
Figs. 7 shows a bolt stop 45 in latched posîtion. A latch 46
which pîvots on a spindle 47 has to be turned away be~ore the bolt
stop can be moved. A fl~heel 49 has been fitted on ehe spindle of a
rotary magnet 48 (not shown in the figure). The flywheel is provided
with a pawl 50 and a pin 51. An arm 52 can swivel on the spindle of
rotary magnet 48. Arm 52 has a hole 53 providing two stops for pin 51.
At the end of arm 5Z a recess 54 has been provided which can operate
together with pawl 50. ~awl 50 can also work together with a stationery
roller 55. Fl~heel 49 has a run-on slot 56. A pin 57 fitted to a
segment 59, which swivels on a fixed pivot 58, works together with
slot 56. Segment 59 operates latch 46 via a link 60. A signalling switch
,.
23~37~
61 has been mounted near the latch; the switch operates when latching
and unlatching takes place.
This embodiment operates as follows.
When rotary magnet 48 is energized, segment 59 is turned clockwise
by run-on slot 56 and pin 57 (Fig. 9). This causes latch 46 to be turned
out of the path of bolt stop 45, so that signalling switch 61 is operated.
Meanwhile pawl 50 has been advanced between roller 55 and recess 54
and pin 51 has reached the other stop in hole 53. Arm 52 is now taken
along and bolt 45 is moved.
When energization of the rotary magnet is discontinued, flywheel
49 returns to its normal position. This causes pawl 50 to move along
roller 55, so that the pawl presses against the end of recess 54,
taking along arm 52, which in turn takes bolt stop 45 back ~o its
normal position. At the end of the movement of flywheel 49, segment
59 turns backwards, causing latch 46 to block bolt stop 45. Again,
signalling switch 61 is operated.
Within the framework of the invention man~ embodiments are
possible. For e~ample, the latch might be coupled to the activating
device electricall~ instead of mechanicall~.
2~ Contrary to the embodiment according to the patent mentioned, theembodiments described can be used without any adaptation for doors
opening clockwise and counter-clockwise when viewed from above.
