JPH0735667U - Lock latch mechanism - Google Patents

Abstract

(57) [Summary] [Purpose] The dead bolt is held and retracted when it is retracted, and the held state is reliably released. The structure is simple and accurate. [Structure] When the dead bolt 3 biased so as to project from the front plate 4 of the lock box 2 is retracted through the retractor 11 by an external operation member such as a knob to open the door, the dead bolt 3 is removed. Latch mechanism 1 that holds the retracted state
4, the front plate 4 and the strike plate 25 face the engaging portion 15 that engages with the dead bolt 3 when the dead bolt 3 is retracted, restricts the projecting bias of the dead bolt 3, and holds the retracted state. A coil spring 20 made of a shape memory alloy that is energized in a closed state, and a releasing portion 16 that releases engagement of the engaging portion 15 with the dead bolt 3 by a restoring force of the coil spring 20 when energized. is doing.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention is a lock for holding a dead bolt, which is biased so as to project from the front plate of the lock box, in a retracted state in the lock box when the dead bolt is retracted via a retractor by a knob or the like. The present invention relates to a latch mechanism of.

[0002]

[Prior art]

 Conventionally, when a dead bolt that is urged to project from the front plate of a lock box is retracted through a retractor using a knob or lever handle, the dead bolt is retained in the lock box in a retracted state. The lock mechanism of a lock includes, for example, a rack tooth row formed on a dead bolt, a control gear that meshes with the rack tooth row, and a locking lever that extends in the radial direction integrally connected to the control gear to form a dead tooth. When the bolt is retracted into the lock box, the locking lever that rotates with the control gear is engaged with the trigger body to keep the dead bolt retracted and the outer end of the trigger body is retained. The first permanent magnet attached to the door rotates the trigger body by the repulsive force of the second permanent magnet facing the door when the door is closed, releasing the engagement between the trigger body and the locking lever and releasing the dead bolt. It shall have been disclosed in Japanese Patent Laid-Open No. 5-222872.

In addition, with the same configuration as described above, the first permanent magnet and the second permanent magnet are configured as different magnetic poles that attract each other when the two magnets face each other when the door is closed. Japanese Patent Application No. 4-341495 has proposed a device for releasing the dead bolt by releasing the engagement between the trigger body and the locking lever.

[0004]

[Problems to be solved by the device]

 However, in the above-mentioned latch mechanism, the rack tooth row and the control gear are always in mesh with each other, and the control gear is always rotated as the dead bolt moves back and forth. That is, even when the engagement between the trigger body and the locking lever is released and the dead bolt is projected by the compression spring, the control gear is rotated, and the meshing with the control gear causes the dead bolt to project. May interfere with

Further, it is difficult to set the magnetic force of the repulsive force or the adsorbing force of the permanent magnet that releases the engagement between the trigger body and the locking lever. Especially, when this magnetic force is weak, the trigger body and the locking lever are It may not be possible to release the engaged state and may not operate properly.

Further, in the conventional latch mechanism as described above, the play on the mechanism such as the shape and arrangement position of each component is suppressed as much as possible, and these precisions are required, so that it cannot be easily manufactured. However, if there is an error, it will not operate reliably and the dead bolt cannot be held in the lock box.

Therefore, in order to solve the above-mentioned problems, the present invention is capable of reliably holding the dead bolt when it is retracted and releasing the held state, and has a simple structure. It is intended to provide a latch mechanism for a lock that can perform an accurate operation.

[0008]

[Means for Solving the Problems]

 Next, means for achieving the above object will be described with reference to FIGS. 1 to 3 corresponding to the embodiment. In the latch mechanism of the lock of the present invention, when the dead bolt 3 biased so as to project from the front plate 4 of the lock box 2 is retracted via the retractor 11 by the external operation member to open the door, In a latch mechanism 14 for holding the dead bolt 3 in a retracted state, when the dead bolt 3 is retracted, the dead bolt 3 is engaged with the dead bolt 3 to regulate a projecting bias of the dead bolt 3 to maintain the retracted state. The shape memory alloy 20 is energized in a closed state where the front plate 4 and the strike plate 25 face each other, and the restoring force of the shape memory alloy 20 at the time of energization causes the engagement part 15 to operate. And a releasing portion 16 for releasing the engagement with the dead bolt 3.

In addition, in the latch mechanism of the lock of the present invention, the dead bolt 3 biased so as to project from the front plate 4 of the lock box 2 is retracted via the retractor 11 by the external operation member to open the door. Therefore, in the latch mechanism 14 for holding the dead bolt 3 in the lock box 2 in the retracted state, the shape memory alloy 20 is energized when the dead bolt 3 is retracted, and the shape memory alloy 20 is energized when the dead bolt 3 is retracted. The engaging portion 15 that engages with the dead bolt 3 by the restoring force of the dead bolt 3 and restricts the projecting urging force of the dead bolt to maintain the retracted state, and the front plate 4 and the strike plate 25 are in a closed state. And a release portion 16 for releasing the energization of the shape memory alloy 20 and releasing the engagement of the engagement portion 15 with the dead bolt 3.

[0010]

[Action]

 When the dead bolt 3 biased so as to project from the front plate 4 of the lock box 2 is retracted by the external operation member through the retractor 11 to open the door, the dead bolt 3 is engaged when the dead bolt 3 is retracted. The portion 15 engages with the dead bolt 3 to regulate the urging force of the protrusion of the dead bolt 3 and maintain the retracted state. When the door is closed from this open state and the front plate 4 and the strike plate 25 are opposed to each other, the release portion 16 having the shape memory alloy 20 is energized, and the restoring force of the shape memory alloy 20 at the time of energization causes The engagement with the dead bolt 3 by the engagement portion 15 is released.

The engaging portion 15 is provided with a shape memory alloy 20, and the restoring force generated by the energization of the shape memory alloy 20 engages with the dead bolt 3 to regulate the protrusion urging and maintain the retracted state. At the same time, when the door is closed, the shape memory alloy 20 may be de-energized to release the engagement with the dead bolt 3 by the engaging portion 15.

[0012]

【Example】

 Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, as shown in FIG. 1, a dead bolt 3 is provided approximately in the center of a lock box 2 fixed to a door 1, and a front and rear direction (right and left in the figure) perpendicular to a front plate 4 of the lock box 2 is provided. Direction).

The dead bolt 3 includes a dead block 5 protruding from the front plate 4, a guide rod 6 extending from the rear end of the dead block 5, and a dead board 7 provided so as to cover the guide rod 6. It is roughly composed.

A compression coil spring 8 is attached to the guide rod 6 of the dead bolt 3, one end of the compression coil spring 8 is attached to the rear end of the dead block 5, and the other end is a side plate of the lock box 2. It is attached to a substantially U-shaped spring receiving plate 9 formed so as to project from the inner surface, and the elastic force of this compression coil spring 8 urges the dead bolt 3 in a direction projecting from the front plate 4. It has become. A locking claw 10 is provided on the lower surface 7a of the dead board 7 of the dead bolt 3 so as to project therefrom.

Next, a retractor 11 is provided below the base end side of the dead bolt 3. The retractor 11 is composed of a substantially disk-shaped or substantially cylindrical base end portion 11a and an arm-shaped actuating portion 11b integrally formed by extending from a part of the base end portion 11a. It is rotatably supported on the side plate of the box 2 about the base end 11a. The working portion 11b of the retractor 11 has its tip inserted into the engagement recess 12 at the base end of the dead bolt 3, and the rear portion of this engagement recess 12, that is, the dead board 7 serving as the base end of the dead bolt 3. The abutting plate 7b constituting the above is abutted.

Further, the base end 11 a of the retractor 11 is provided with a substantially rectangular through hole 13, which drives the lock box 2 and the door 1 to have a substantially rectangular cross-section. A shaft (not shown) is attached, and external operation members (not shown) such as a lever handle and a knob are attached to both ends of the drive shaft.

Although not shown, the retractor 11 has a return spring, which is a torsion spring, attached to the base end portion 11a so as to urge the retractor 11 counterclockwise in FIG. In addition, the operating portion 11b is regulated to stop in a vertical state.

Next, below the dead bolt 3, a latch mechanism 14 is arranged in proximity to the dead bolt 3. The latch mechanism 14 is composed of an engaging portion 15 and a releasing portion 16 and faces the locking claw 10 of the dead bolt 3 described above.

The engaging portion 15 of the latch mechanism 14 is attached to a guide bracket 17 having a substantially U shape fixed to the inner surface of the side plate of the lock box 2 in the vertical direction in the figure, that is, with respect to the moving direction of the dead bolt 3. Of the engagement pin 18 slidably provided in the direction orthogonal to each other, and the engagement pin 18 between the flange portion 18a provided in the middle of the engagement pin 18 and the bottom plate 17a of the guide bracket 17. It is composed of a bias spring 19 made up of a compression coil spring wound around the lower half portion, and the elastic force of the bias spring 19 causes the engaging pin 18 to be always attached in the upward direction, that is, in the direction of the lower surface of the dead bolt 3. It is becoming popular.

A coil spring 20 made of a shape memory alloy is wound around the upper half portion of the engagement pin 18 between the flange portion 18a of the engagement pin 18 and the top plate 17b of the guide bracket 17, and the release portion. It is supposed to be 16. The coil spring 20 that constitutes the release portion 16 has a shape that is stored in an expanded state, and the reed switches 21 that are provided near the front plate 4 at both ends of the coil spring 20 as shown in FIG. A circuit 23 constituted by a micro switch 22 for detecting the position of the dead bolt 3 is connected. The power source connected to the circuit 23 is a power source of a predetermined voltage obtained by transforming a commercial power source, a battery, or the like.

In a normal state, the coil spring 20 is compressed and deformed between the top plate 17b of the guide bracket 17 and the flange portion 18a by the biasing force of the bias spring 19, and is stored as heat generated by energization. It is designed to restore the stretched state of the shape. The restoring force of the coil spring 20 is set to be larger than the elastic force of the bias spring 19.

Next, the operation of the lock latch mechanism constructed as described above will be described. First, when the door 1 is closed, as shown in FIG. 1, the dead bolt 3 protrudes, and the dead block 5 is inserted into the engagement hole 26 formed in the strike plate 25 of the door frame 24. Further, the engaging pin 18 of the latch mechanism 14 is in a protruding state, and the reed switch 21 near the front plate 4 is in a state of being turned on by a magnetic field of a permanent magnet (not shown) on the strike plate 25 side of the door frame 24. Also, the micro switch 22 for detecting the position of the dead bolt 3 is in the off state.

Next, when the door 1 is opened from the closed state, the retractor 11 is rotated in the clockwise direction in the figure by an external operation member such as a knob or a lever handle. The dead bolt 3 retracts in the lock box 2 (to the right in the figure), the dead block 5 retracts from the engagement hole 26 of the strike plate 25, and the door 1 is pushed or pulled to open it.

At the time of this opening, that is, when the dead bolt 3 is retracted, as shown in FIG. 3, the engagement pin 18 of the latch mechanism 14 passes over the locking pawl 10 of the dead bolt 3 and passes, and the bias spring 19 is also passed. Urging the dead bolt 3 into engagement with each other and retracting the dead bolt 3 to regulate and hold the projecting bias of the dead bolt 3.

Then, when the hands are released from the external operation member such as the knob, the retractor 11 returns to the vertical initial state (one-dot chain line in FIG. 3) by the biasing force of the torsion spring. That is, in the door open state, the dead block 5 of the dead bolt 3 does not project from the front plate 4 of the door 1. At this time, the micro switch 22 for detecting the position of the dead bolt 3 is turned on, but the reed switch 21 is turned off because it is separated from the magnetic field of the permanent magnet on the side of the strike plate 25.

Next, in order to close the door from the open state, it is only necessary to close the door 1 without operating an external operation member such as a knob. The door 1 is closed and the front plate 4 and the strike plate 25 face each other. Then, the permanent magnet provided on the strike plate 25 is detected by the reed switch 21 provided near the front plate 4, and the magnetic field of the permanent magnet closes the circuit to supply power to the coil spring 20 of the latch mechanism 14. To do. Then, the coil spring 20 returns to the memorized shape, that is, the extended shape, compresses the bias spring 19 against the biasing force of the bias spring 19, and pushes the engaging pin 18 downward. As a result, the engagement state between the engagement pin 18 and the locking claw 10 is released, that is, the holding of the dead bolt 3 in the retracted state is released, the dead block 5 is projected from the front plate 4, and the strike plate 25 is released. Engage in the engagement hole 26.

When the dead bolt 3 is projected and returns to the original position, the micro switch 22 provided in the vicinity of the dead bolt 3 detects this, disconnects the circuit 23, and sends the latch mechanism 14 to the latch mechanism 14. Stop the power supply. The coil spring 20 of the latch mechanism 14 whose power supply has been cut off is compressed and deformed from the extended state by the biasing force of the bias spring 19 to cause the engagement pin 18 to project toward the lower surface of the dead bolt 3 again.

Therefore, in the lock mechanism of the lock configured as described above, the structure for holding the dead bolt 3 when the dead bolt 3 is retracted is such that the engagement pin 18 is projected by the bias spring 19, and Since the releasing portion 16 for releasing the holding (engagement) is the coil spring 20 made of a shape memory alloy, the engaged state of the dead bolt 3 can be released only by energizing the coil spring 20. In other words, the simple structure allows the deadbolt 3 to be properly and reliably engaged and held, and since it does not use the conventional gear-like elements that require precision, it can be easily manufactured and can be easily worn and damaged. Loss is hard to occur and works reliably.

Further, since the operation source for releasing the retracted state of the dead bolt 3 is not the repulsive force or the attraction force between the magnets but the restoring force of the shape memory alloy by energization, the operation is reliable, and the self-operation by energization is performed. Since it is quickly restored by heat generation, the dead bolt 3 can be projected at the same time as the door is closed without malfunction.

In the embodiment described above, the engaging portion 15 of the latch mechanism 14 is the bias spring 19 and the releasing portion 16 is the coil spring 20 of the shape memory alloy, but the engaging portion 15 is the shape memory. The releasing portion 20 may be a bias spring, which is configured by an alloy coil spring and an engaging pin. In this case, the engaging portion 15 is energized only when the door is opened, the energization is cut off when the door is closed from the open state, the engagement pin is lowered, and the engagement state with the dead bolt 3 is released. , So that the dead bolt 3 is projected.

Further, in the above-described embodiment, the example in which the engaging claw 10 is provided on the lower surface of the dead bolt 3 and the engaging claw 10 engages with the engaging claw 10 is described. As shown, a locking recess 10 ′ may be formed on the lower surface of the dead bolt 3, and the engaging pin 18 may be engaged with this.

Further, as shown in FIG. 5, the dead bolt 3 is provided with a locking claw 10 having a built-in compression spring 10a, and a latch mechanism 14 similar to that of the above-described embodiment is provided therein. Good. In this case, when the dead bolt 3 retracts, the engaging pin 18 of the engaging portion 15 and the locking claw 10 contract with respect to each other, so that the backward movement of the dead bolt 3 is not hindered and resistance is not generated.

Further, as shown in FIG. 6, instead of the above-mentioned engagement pin, a block-shaped engagement claw 18 'may be formed. In this case, for example, the latch mechanism 14 is configured as a double coil spring in which a coil spring 20 made of a shape memory alloy and a bias spring 19 are concentrically arranged as shown in FIG. 6, and the outer peripheral side or the inner peripheral side is bias spring 19. The inner or outer circumference side is the coil spring 20. The bias spring 19 may be a compression coil spring, the coil spring 20 may store the retracted state, and both ends may be fixed to the locking claw 18 'and the lock box 2 side. As a result, the biasing spring 19 constantly biases the locking claw 18 'toward the dead bolt 3, and the coil spring 20 contracts when energized to retract the locking claw 18'.

Further, in the above-described embodiment, the example in which the micro switch 22 for detecting the position of the dead bolt 3 is provided has been described. However, the circuit 23 is configured to detect the position of the engaging pin 18 of the latch mechanism 14. Alternatively, instead of the reed switch 21, a micro switch 22 or the like may be used to energize when the front plate 4 and the strike plate 25 face each other.

Further, in the above-described embodiment, the microswitch 22 cuts the circuit 23 to close the shape memory alloy (coil spring 20) when the door is closed, but the microswitch 22 is connected to the coil spring 20. If the circuit 23 is switched while the power supply is cut off, it is possible to configure a circuit for monitoring the closed state of the door 1.

In each of the above-described embodiments, the coil spring 20 made of a shape memory alloy is formed in either the engaging portion 15 or the releasing portion 16 of the latch mechanism 14, and the coil spring 20 and the bias spring 19 are combined. An example of a configuration in which the operation is performed in two directions has been described. However, as shown in FIG. 7, a two-way shape memory alloy that remembers the shapes at both high temperature and low temperature is used, The coil spring 20 </ b> A, which serves as both operation sources of the release section 16, may be configured by one. In this case, if the memory is memorized in the state where electricity is not supplied, that is, the shape at room temperature and the shape that deforms due to heat generated by electricity, the configuration will be further simplified, and a power supply and a switch or sensor etc. for performing this operation will be combined. As a result, it becomes possible to hold and release the dead bolt 3.

Further, in each of the above-described embodiments, the shape of the shape memory alloy forming the releasing portion 16 or the engaging portion 15 has been described as a coil spring, but the present invention is not limited to this and may be formed in a leaf spring shape, for example. Alternatively, it may be constituted by a torsion coil spring.

[0038]

[Effect of device]

 As described above, in the lock latch mechanism according to the present invention, the shape memory is provided in the engaging portion that holds the dead bolt when it retracts, or the releasing portion that releases the engagement between the dead bolt and the engaging portion. Since an alloy is used and the restoring force of this shape memory alloy is performed by energizing, it is possible to easily manufacture it because it does not use the conventional elements such as gears that require precision. In addition to being effective, there is no configuration that imposes a load on the movement of the dead bolt, so there is the effect that smooth operation is possible.

In addition, since the operation is surely performed only by the structure in which the shape memory alloy is energized, there is an effect that it can be realized by a simple structure.

Further, from this, there is an effect that damage to the lock is unlikely to occur and a highly reliable lock can be obtained.

[Brief description of drawings]

FIG. 1 is a side sectional view showing an embodiment of a latch mechanism of a lock according to the present invention.

FIG. 2 is a circuit configuration diagram connected to the latch mechanism according to the embodiment.

FIG. 3 is an operation explanatory view of the latch mechanism according to the embodiment.

FIG. 4 is an enlarged side sectional view of an essential part showing a lock mechanism of a lock according to another embodiment.

FIG. 5 is an enlarged side sectional view of an essential part showing a lock mechanism of a lock according to another embodiment.

FIG. 6 is an enlarged side sectional view of an essential part showing a latch mechanism of a lock according to another embodiment.

FIG. 7 is an enlarged side sectional view of an essential part showing a latch mechanism of a lock according to another embodiment.

[Explanation of symbols]

 2 ... Lock box 3 ... Dead bolt 4 ... Front plate 11 ... Retractor 14 ... Latch mechanism 15 ... Engagement part 16 ... Release part 20 ... Shape memory alloy (coil spring) 25 ... Strike plate

Claims (2)

[Scope of utility model registration request] 1. A dead bolt that is biased to project from a front plate of a lock box is retracted by an external operating member through a retractor to open a door, and the dead bolt is held in the retracted state. In the latch mechanism, when the dead bolt is retracted, the front plate and the strike plate are opposed to the engaging portion that engages with the dead bolt and restricts the projecting bias of the dead bolt to maintain the retracted state. A shape memory alloy that is energized in a closed state, and a releasing portion that releases the engagement of the engagement portion with the dead bolt by the restoring force of the shape memory alloy when the electricity is applied. And a latch mechanism for the lock. 2. The dead bolt is retracted into the lock box when the dead bolt biased to project from the front plate of the lock box is retracted by an external operating member through the retractor to open the door. A latch mechanism for holding the dead bolt in a state of having a shape memory alloy that is energized when the dead bolt retracts, and engages with the dead bolt by the restoring force of the shape memory alloy when energized, and the dead bolt protrudes. Between the engaging portion that regulates the force and holds the retracted state, and the energization to the shape memory alloy in the closed state where the front plate and the strike plate face each other, and the dead bolt by the engaging portion. A latching mechanism for a lock, comprising: a releasing part for releasing the engagement.