JP4341816B2 - Anti-seismic lock mechanism - Google Patents

Description

  The present invention relates to an anti-seismic lock mechanism (hereinafter simply referred to as a lock mechanism) for an electric lock, and more particularly, to a lock mechanism that does not cause a problem even if it receives an excitation force from an earthquake or mechanical vibration.

  The present applicant has previously proposed a novel electric lock capable of anti-panic using Patent Document 1 described later.

  Here, the anti-panic refers to the operation mode of the lock that can be unlocked by turning the handle from the indoor side even if the dead bolt is locked from the outdoor side by the operation of the electromagnetic actuator of the electric lock. To do.

  In the present invention, since there is no direct relation to whether or not the electric lock is anti-panic, the description of the anti-panic mechanism is omitted.

  Since the structure of this electric lock is described in detail in Japanese Patent Application Laid-Open No. 2003-133260, the electric lock will be described with reference to FIG. The drive cam shaft 3 is rotatably supported, and the drive cam 4 is integrally connected to the drive cam shaft 3.

  A first retractor 6 that is relatively long in the vertical direction and a horizontally long second retractor 7 are pivotally supported on the first support shaft 5 in the vicinity of the drive camshaft 3 so as to be independently rotatable.

  Further, on the surface of the first retractor 6 on the side facing the second retractor 7, the base end (left end) is rotated by the second support shaft 10 in the vicinity of the free end edge above the second retractor 7. A clutch lever 8 that is freely supported and has a free end bent into a bowl shape is disposed.

  The clutch lever 8 faces the engagement end 7a of the second retractor 7 in the locked state shown by the solid line in FIG. 1, but counterclockwise in FIG. 1 due to the elasticity of the clutch spring 8a. Is being energized.

  Furthermore, a portion of the second retractor 7 facing the drive cam 4 is provided with a driven cam 7b. When the drive cam shaft 3 is rotated clockwise or counterclockwise by a handle (not shown), a broken line in FIG. As shown, the second retractor 7 rotates clockwise, but the first retractor 6 and the dead bolt 9 engaged therewith do not move, and the handle rotates idle.

  On the other hand, when the electric lock is unlocked and the unlock signal is supplied to the solenoid 11, for example, the plunger is extended and the unlocking lever 12 is driven in the counterclockwise direction as shown in FIG. The first and second retractors 6 and 7 are connected together via the clutch lever 8 as a result of pushing the free end of 8 downward.

When the handle is turned in this state, the first and second retractors 6 and 7 are integrally rotated in the clockwise direction, and the drive pin 6a implanted in the first retractor 6 is made elastic by the return spring 13. The dead bolt 9 is retracted into the lock box.
Japanese Patent Application No. 6-282691

  The electric lock of the type configured as described above, which locks and unlocks by engaging / disengaging the first and second retractors via the clutch lever, has a drive system that matches the unlocking lever and the clutch lever. Since it must be driven by a non-powerful solenoid, it is not possible to adopt a mechanism for stably maintaining the locking position shown in FIG.

  For this reason, it cannot be said that there is no possibility that an earthquake will occur in the locked state or there is a vibration source such as a machine in the vicinity and the clutch lever 8 will resonate with it. If the handle is accidentally engaged with the engaging end 7a of the retractor, the hook clutch lever 8 and the second retractor 7 are engaged with each other, and the electric lock is unlocked.

  Alternatively, there is a case where the clutch lever 8 and the second retractor 7 are automatically engaged with each other by applying an excitation force to the handle even when the hand is not put on the handle.

  Of course, such an inconvenience did not actually occur, but the present inventors confirmed that such a tendency was found as a result of experiments using a vibrator and the like.

  Accordingly, an object of the present invention is to provide a lock mechanism that does not unlock in the unlikely event of an earthquake or vibration in an electric lock of the type in which the first and second retractors are connected via a clutch lever. Therefore, the object is to further improve the safety of the electric lock without the above-mentioned worries.

  In order to achieve the above object, according to the lock mechanism of the present invention, a first support shaft is provided in the vicinity of a drive cam shaft connected to an external operation member such as a handle, and the first and second support shafts are provided on the first support shaft. The base end of the clutch lever, which has a hook on the free end, can be rotated on the first retractor that pivotally supports the base end of the retractor independently of each other and the free end engages with the dead bolt. And the urging portion of the second retractor is engaged with the engaging end of the second retractor and is urged away from the engaging end. Is provided with an unlocking lever that is driven by the solenoid that receives the clutch and engages the free end of the clutch lever with the engaging end of the second retractor, thereby integrally connecting the first and second retractors when unlocked. In such a locking mechanism, the second retractor An impact lever that is disposed near and is supported so as to be able to swing between an angular position where one end interferes with the movement trajectory and an angular position where the other end does not interfere is provided. It is characterized in that it is urged in the direction of retreating from the movement trajectory of the retractor.

  The lock mechanism according to the present invention configured as described above is configured such that when an excitation force is applied to the lock box due to an earthquake or vibration, a component force in the swing direction is applied to the clutch lever and the center of gravity of the stop lever is applied. A vibrational force is applied, and a rotational moment is applied to the stop lever.

  Due to these excitation force and rotational moment, the clutch lever swings and the stop lever also vibrates, but since the inertial moment of the stop lever is small and the biasing force is large, the natural frequency of the stop lever is It is much larger than that of the clutch lever, and even faster than the second retractor connected to the handle.

  For this reason, one end of the stopper lever enters the movement path of the second retractor in a manner that precedes the rotation of the second retractor, and interferes with the rear end to stop it. Can be prevented from being unlocked.

  The adverse effect caused by the vibration of the clutch lever supported by the movable member is eliminated with a simple configuration in which a pivoting lever provided on a fixed member called a side plate of the lock box is provided.

Code 1 4 2 shows the衝止lever, the衝止lever 1 4 is disposed near the rear end of the second retractor 7 (right end in FIG. 2) in the locked position, the third support shaft 15 around the is pivotally supported between the interfering angular position and the moving locus end 1 4 a is a non-interfering angular position (the angular position shown in FIG. 2).

衝止lever 1 4 in the illustrated embodiment, a lever projection shape substantially L-shaped with respect to the side plate 2 of the lock box, one end 1 4 free end facing the a is folded double, the center of gravity Te following the The inertial moment of the stop lever is increased away from the three spindles 15 to facilitate vibration.

  Further, the impact lever 14 is urged clockwise in FIG. 2 by an elastic force of an urging spring (not shown) wound around the third spindle 15 and an external force is applied to the urging spring. In a normal state where the movement is not performed, one end of the second retractor 7 is at a position where it is retracted from the movement locus.

  In the lock mechanism according to the embodiment of the present invention configured as described above, when a vibration force is applied before the lock, the stop lever 14 vibrates and one end thereof stops the rear end of the second retractor 7. Therefore, even if the clutch lever 8 is engaged with the engagement end 7a of the second retractor by vibration, the engagement of the two by the rotation of the second retractor 7 is prevented. .

  In a normal state where no vibration force is applied before the lock, the stopper lever 14 is in a position retracted from the movement locus of the second retractor, and therefore does not interfere with the operation of the lock.

FIG. 5 is a side view of an electric lock that is partially cut away and shown with some members omitted, showing a locked state. It is a side view of the electric lock equipped with the anti-seismic locking mechanism by this invention, and also shows the unlocking state of the electric lock of FIG.

Explanation of symbols

1 lock box 2 side plate 3 drive cam shaft 4 drive cam 5 first support shaft 6 first retractor 6a drive pin 7 second retractor 7a engagement end 7b driven cam 8 clutch lever 8a clutch spring 9 dead bolt 10 second support Shaft 11 Solenoid 13 Return spring 14 Stop lever 14a One end 15 Third spindle

Claims (1)

  A first support shaft is provided in the vicinity of a drive cam shaft connected to an external operation member such as a handle, and the base ends of the first and second retractors are rotatably supported on the first support shaft independently of each other. The base end of the clutch lever having a free end formed on the first retractor whose free end engages with the dead bolt is rotatably supported, and the free end is engaged with the engaging end of the second retractor. The clutch lever is urged in a direction away from the engagement end, and driven near the free end of the clutch lever by a solenoid that has received an unlocking signal. An unlocking lever that is engaged with the engagement end of the retractor is provided, so that the first and second retractors are integrally connected when unlocked, and is disposed near the second retractor. The angular position where one end interferes with the movement trajectory A stop lever supported so as to be able to swing between an angular position where it does not interfere is provided, and this stop lever is biased in a direction in which one end thereof is retracted from the movement locus of the second retractor. Anti-seismic lock mechanism.

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