JP2011208401A - Earthquake-resistant locking mechanism - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an earthquake-resistant locking mechanism which prevents a locking lever from coming off a latch head during excitation and being put into an unlocked state and which prevents the locking lever from being incapable of being disengaged from the latch head.SOLUTION: The earthquake-resistant locking mechanism includes a latch bolt 1 which is equipped with the latch head having a slope formed at a front end, and the locking lever 8, the front end of which is urged in the direction of engagement with a step portion of the latch head 4. A stopper 9 made of a leaf spring material is provided to be joined to a back surface of the latch head 4; and an end, facing the front end of the locking lever, of the stopper 9 is molded in such a shape as to curl up toward the inside of a lock case, and looks out upon the front end of the locking lever 8 in an engageable manner.

Description

  The present invention relates to an anti-seismic locking mechanism such as an electric lock or a so-called hotel lock, and more particularly to an anti-seismic locking mechanism that does not cause a problem even if it receives an excitation force from an earthquake or mechanical vibration.

  In the event of an earthquake or vibration, the applicant of the present invention has previously disclosed the following patent document 1 in the locking mechanism using the locking lever 8 biased to engage the tip of the step of the latch head 4a. We proposed a locking mechanism that never locks.

  This locking mechanism is guided so as to be movable in the front-rear direction perpendicular to the front plate in the lock box, and is biased forward in the direction protruding from the front plate, and a latch head having a slope formed at the front end is mounted. A latch bolt and in the vicinity of the latch bolt are disposed in a lock box near the front plate, and are rotatably supported around a support shaft in a plane parallel to the side plate of the lock box. With a locking lever biased in a direction to engage with the stepped portion, a horizontal ridge is provided on one of the stepped portion of the latch head and the front end of the locking lever, and the other is engaged with this ridge. Recesses that can be combined are formed, an excitation force is applied to the lock box, the latch bolt is urged in a direction to be pulled into the lock box, and the front end of the lock lever is separated from the step of the latch head. When biased in the direction, There is characterized in that the front end of the locking lever is to prevent removal of the stepped portion of the latch head in engagement with each other.

JP 2006-077424

  The anti-seismic locking mechanism according to the invention described in Patent Document 1 configured as described above, of course, exhibits the expected function, and the unlocking lever is released from the latch head during vibration and becomes unlocked. There was no.

  However, the guide of the latch head became unsmooth due to the failure of the door installation, the strike and latch head misalignment, or the latch head was pressed against the strike by the closer. The latch head may be slightly retracted by scissors (see FIG. 5 of Patent Document 1).

  In such a case, even if you try to unlock by moving the locking lever in the unlocking direction, the engagement between the ridge and the recess will not be released, so the latch head will be retracted even if you operate the handle or knob etc. There is still room for improvement, such as being trapped inside the room when the person is indoors and being locked out when the person is outside the room.

  Accordingly, the present invention provides an anti-seismic locking mechanism in which the locking lever is released from the latch head during vibration and is unlocked, and the locking lever does not become detached from the latch head. It is an object.

  In order to achieve the above object, the present invention is guided so as to be movable in the front-rear direction perpendicular to the front plate in the lock box, and is urged forward in the direction protruding from the front plate to form a slope at the front end. A latch bolt equipped with a latch head, and in the vicinity of the latch bolt, in a lock box close to the front plate, and supported rotatably around a support shaft in a plane parallel to the side plate of the lock box. A stopper made of a leaf spring material is provided so that the front end has a locking lever biased in a direction to engage with the step portion of the latch head, and is joined to the back surface of the latch head constituting the step portion. The stopper end of the stopper facing the front end of the stopper is molded so that it swells toward the inside of the lock box and the latch bolt protrudes from the front plate in the normal state. The end is separated from the movement locus of the front end of the locking lever, and the end of the stopper faces the front end of the locking lever so that it can be engaged when the latch bolt is slightly retracted. .

  In the anti-seismic locking mechanism according to the first aspect of the present invention configured as described above, when an excitation force is applied to the lock box due to an earthquake or vibration, the locking lever and the latch bolt are caused by the excitation force. Acceleration is applied to the center of gravity of both.

  When the vector indicating the acceleration is, for example, one of the vertical direction and the horizontal direction, the latch bolt does not move even if the locking lever swings. The locking lever is engaged with the stepped portion of the latch head, and in this case, the locking mechanism is not unlocked.

  Alternatively, if the acceleration acts in the horizontal direction and the latch bolt is urged in the direction of pulling into the lock box, the engagement between the front end of the lock lever and the step of the latch head will not be released. In addition, the locked state of the locking mechanism is not released.

  On the other hand, the exciting force acts two-dimensionally and urges the latch bolt in a direction to be pulled into the lock box, and urges the front end of the lock lever to retreat out of the movement path of the latch head. In this case, as described above, the lock mechanism may be unlocked and unlocked.

  In this case, for example, plastic deformation may occur in the latch bolt guide mechanism of the lock box due to distortion of the door caused by an earthquake, and the unlocked state of the lock mechanism may be fixed if the latch bolt cannot return to the original position. There is.

  However, in the case of the anti-seismic locking mechanism according to the present invention, in such a case, the latch bolt is moved backward so that the end of the stopper is engaged with the front end of the locking lever so as to suppress it. This prevents the locking lever from being released from the stepped portion of the latch head and unlocking the locking mechanism.

  On the other hand, when the latch bolt guide mechanism of the lock box is plastically deformed due to the distortion of the door caused by an earthquake, for example, the latch bolt cannot return to the original position, and the lock lever is also pressed by the stopper, In the invention described in Patent Document 1, unlocking is impossible due to the engagement of the ridge and the recess, and the householder is confined or locked out.

  However, in the present invention, by forcibly rotating the locking lever in the unlocking direction, the engagement between the locking lever and the stopper is released by the elastic deformation of the stopper, so that the above-described disadvantages can be solved. , Has the expected effect.

  The latch bolt is free of plastic deformation in the latch bolt guide mechanism, and in the normal state where the latch bolt protrudes from the front plate due to its urging force, the end of the stopper is separated from the movement locus of the front end of the lock lever. Therefore, there are various effects such as having no influence on the normal locking / unlocking operation.

The enlarged partial cross-sectional side view of the lock box of the hotel lock shows a normal state where no excitation force is applied. The front view of a locking lever. The side view of a stopper. The rear view of a stopper. 1 is a side view similar to FIG. 1, showing a state where the latch bolt has moved slightly inward of the lock box.

  A latch bolt having a latch head having a slope formed at the front end, and a locking lever biased in a direction in which the front end is engaged with the step portion of the latch head. A stopper made of leaf spring material is provided so as to be joined to the back, and the end of the stopper facing the front end of the locking lever of this stopper is molded so as to swell toward the inside of the lock box, and the latch bolt is the front plate. In the normal state protruding from the stopper, the end of the stopper should be separated from the movement locus of the front end of the locking lever. To.

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 is an enlarged side view showing a so-called hotel lock box with a cover plate removed. In FIG. 1, reference numeral 1 denotes a latch bolt which also functions as a dead bolt.

  The latch bolt 1 is guided in a lock box 2 so as to be movable in the front-rear direction (left-right direction in the figure) perpendicular to the front plate 3, and a latch head 4 having a slope 4a is mounted at the front end.

  The latch bolt 1 is biased forward, that is, leftward in the figure, by the elasticity of the latch bolt spring 5 as a compression coil spring.

  In addition, the protrusion position at the time of locking of the illustrated latch bolt is determined by the engagement between a part of the latch board 6 and an opening through which an unnumbered latch head of the front plate 3 enters and exits.

  On the other hand, as shown in FIG. 1, a support shaft 7 is implanted in the lock box side plate 2 a below the latch bolt 1, and a lock lever 8 is rotatably supported on the support shaft 7.

  This locking lever 8 is engaged with the stepped portion of the latch head 4 in a clockwise direction in FIG. 1 by a torsion coil spring wound around the support shaft 7 and not numbered for the sake of clarity. Is biased in the direction.

  As shown in FIG. 2, the locking lever 8 in the illustrated embodiment is a frame body that is formed by bending a plate material into a U-shape whose cross section is opened downward.

  On the other hand, as shown in FIG. 1, a stopper 9 made of a leaf spring material is mounted so as to be joined to the back surface of the latch head 4 constituting the stepped portion.

  As shown in FIGS. 3 and 4, the stopper 9 in the illustrated embodiment is a leaf spring having a substantially rectangular shape. For example, the latch bolt 6 is inserted through a circular opening at the center of a rectangular main body. In this manner, the latch 11 is mounted by being sandwiched between the flange 11 formed on the latch bolt and the latch head 4.

  And the edge part (lower-end protrusion part in FIG.3 and FIG.4) of the stopper which opposes the lock lever front end of this stopper 9 is shape | molded so that it may curl up toward a lock box inward.

  In the normal state in which the latch bolt 1 protrudes from the front plate 3, the shape and dimensions of the stopper 9 are set so that the end of the stopper 9 is separated from the movement locus of the front end of the locking lever 8.

  On the other hand, when the latch bolt 6 is slightly retracted into the lock box as shown in FIG. 5, the end of the stopper 9 faces the front end of the lock lever so that it can be engaged. As described above, both should be polymerized.

DESCRIPTION OF SYMBOLS 1 Latch bolt 2 Lock box 3 Front board 4 Latch head 5 Latch bolt spring 6 Latch board 7 Support shaft 8 Locking lever 9 Stopper 11 Flange

Claims (1)

  A latch bolt that is guided so as to be movable in the front-rear direction perpendicular to the front plate in the lock box, is urged forward in a direction protruding from the front plate, and has a latch head that forms a slope at the front end, and the latch Located in the lock box near the front plate in the vicinity of the bolt, is supported so as to be rotatable around a support shaft in a plane parallel to the side plate of the lock box, and the front end engages with the step portion of the latch head. A stopper having a locking lever biased in the direction is provided with a stopper made of a leaf spring material so as to be joined to the back surface of the latch bolt constituting the stepped portion, and the stopper facing the front end of the locking lever of this stopper In the normal state where the latch bolt protrudes from the front plate, the end of the stopper is separated from the movement locus of the front end of the lock lever. To make it to also seismic locking mechanism and an end portion of the stopper has to face engageable with the front end of the locking lever is in a state where the latch bolt is retracted slightly.

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