JP3008967B2 - Guard arm locking mechanism of guard arm lock - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a guard arm locking mechanism for a guard arm lock (hereinafter simply referred to as a locking mechanism). (Gap between the frame).

[0002]

2. Description of the Related Art In recent years, a so-called guard arm lock having the function of a conventional door chain has been proposed and put into practical use.
This guard arm lock is disclosed, for example, in JP-B-61-8235, JP-A-60-61364, or JP-A-62-16364.
As described in Japanese Patent Application Laid-Open No. 0-104556, a groove for engaging with a guard arm is formed at the tip of a dead bolt having a modified cross section that protrudes from the free side edge of the door toward the door frame, and the dead bolt is formed. The projecting amount can be set in two stages, large and small. On the other hand, one end of a guard arm is swingably supported on the door frame side facing the free side edge of the door when the door is closed.
At the other end of the guard arm that is aligned with the dead bolt when the door is closed, an odd-shaped engagement hole that can be fitted to the tip of the dead bolt is opened.

[0003] When the guard arm device is operated, a small amount of the dead bolt is protruded by operating the thumb turn on the indoor side, and the tip of the dead bolt does not catch on the strike bolt input hole opened in the door frame. Is made to engage with the engagement hole of the guard arm.

When the door is opened in this state, the guard arm tilts in a state where the tip of the dead bolt is engaged with the other end of the guard arm, and the opening angle of the door becomes a constant value determined by the length of the guard arm. No further opening of the door is possible, and in this way the guard arm device functions like a door chain.

[0005]

However, such a guard arm lock allows the guard arm to follow the movement of the dead bolt so that the door chain converts the slack into tension to allow a certain opening angle of the door. The structure must be able to do so.

For this reason, a conventional guard arm lock is constructed such that the guard arm is foldable in the invention described in, for example, Japanese Utility Model Application Laid-Open No. 60-61364. In the device described in JP-A-104556, the guard arm is configured to be extendable and contractable like a blade and a sheath.

However, when the guard arm is configured in this manner, the guard arm becomes thick and cannot be stored in dust. Therefore, the guard arm is usually cut away on the door frame side to store the guard arm. However, this not only complicates the processing of the door frame, but also causes a disadvantage that the strength of the door frame is reduced due to the cutout of the door frame.

On the other hand, in the invention described in Japanese Patent Publication No. 61-8235, the guard arm is formed of a thin plate, and the other end (free end) of the guard arm having one end swingably supported. Part), a long hole is opened, the tip of the dead bolt is engaged with this long hole, and the tip of the dead bolt slides toward the free end of the guard arm as the opening angle of the door increases. are doing.

However, when the door is opened, the dead bolt moves in the horizontal direction when the door is opened, whereas the guard arm swings around one end supported on the door frame side. Since the moving amount of the free end of the guard arm is larger than the moving amount, if the door has a mating portion, the free end of the guard arm interferes with the mating portion and the door cannot be opened. , Occurs.

One of the disadvantages of the above-mentioned conventional guard arm lock is that the dead bolt which forms a part of the locking mechanism of the guard arm does not move. This must be resolved on the side.

An object of the present invention is to provide a guard arm locking mechanism which does not cause the above-mentioned inconvenience while the guard arm is made of a thin plate material and can be housed in dust.

[0012]

Means for Solving the Problems In order to achieve the above object, the invention according to claim 1 is guided inside a lock box so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, A slider selectively placed in an unlocking position, a locking position, and an intermediate position of the guard arm by the thumb turn, and a groove which is carried by the slider and engages with a free end of the guard arm at a front end thereof, and A dead bolt guided vertically movably on the slider, and a long vertical bolt hole is opened in the front plate to avoid interference with the dead bolt moving vertically. It is characterized by.

According to a second aspect of the present invention, in the lock box, the lock position is guided by the thumb turn so as to be movable in the front-rear direction perpendicular to the front plate of the lock box. A slider selectively positioned at an intermediate guard arm operating position, a groove supported by the slider and engaging a free end of the guard arm at a front end, and guided to be vertically movable on the slider. A dead bolt, and a spring member for biasing the dead bolt in a vertical direction toward a normal position aligned with the dead bolt input hole of the strike of the door frame. A vertically long deadbolt hole is opened to avoid interference with the deadbolt moving in the vertical direction.

According to a third aspect of the present invention, in the lock box, the lock position, the unlock position, and the lock position are guided by the thumb turn so as to be movable in the front-rear direction perpendicular to the front plate of the lock box. A slider which is selectively placed in an intermediate guard arm operating position, and a groove which is carried by the slider and engages with a free end of the guard arm at a front end thereof;
A dead bolt guided vertically movably on the slider, a T-shaped guide groove fixed in the lock box and extending in a plane parallel to the side number of the lock box, and a side surface of the dead bolt And a guide pin that engages with the guide groove. When the dead bolt is in a normal position in which the dead bolt is aligned with the dead bolt insertion hole in the vertical direction, the guide pin engages with the horizontal bar portion of the guide groove. When the slider is in the guard arm operating position in the front-rear direction, the guide pin has a guide mechanism capable of engaging with the vertical bar portion of the guide groove. In order to avoid interference with the deadbolt, a vertically long deadbolt hole is opened.

According to a fourth aspect of the present invention, in the lock box, the lock position, the unlock position, and the unlock position and the lock position are guided by the thumb turn so as to be movable in the front-rear direction perpendicular to the front plate of the lock box. A slider selectively positioned at an intermediate guard arm operating position, a groove supported by the slider and engaging a free end of the guard arm at a front end, and guided to be vertically movable on the slider. A dead bolt, a T-shaped guide groove fixed in the lock box and extending in a plane parallel to the side number of the lock box, and protruding from a side surface of the dead bolt to engage with the guide groove. When the dead bolt is in the normal position aligned with the dead bolt insertion hole in the vertical direction, the guide pin engages with the horizontal bar of the guide groove, and the slider operates the guard arm in the front-rear direction. Rank When the guide pin is engaged with the vertical rod portion of the guide groove, the guide bolt and the dead bolt are moved in a vertical position to a normal position matching the dead bolt input hole of the strike of the door frame. A spring member for urging in a direction toward the front plate, and a dead bolt hole long in the vertical direction is opened in the front plate in order to avoid interference with the dead bolt moving in the vertical direction.

[0016]

According to the first aspect of the present invention, the locking mechanism according to the first aspect of the present invention urges the dead bolt downward by utilizing the acceleration due to gravity, and lowers the dead bolt vertically. Sit in the normal position. That is, the invention described in claim 1 is applicable only when the normal position where the dead bolt is aligned with the dead bolt insertion hole of the door frame is at the lower end of the vertical movement range of the slider.

In this locking mechanism, the deadbolt is retracted into the lock box when the slider is in the unlocked position.

When the slider is placed in the guard arm operating position by the thumb turn when the door is closed, the groove at the front end of the dead bolt engages with the irregularly formed hole opened at the free end of the guard arm, but opens at the door frame. It does not hang on the deadbolt insertion hole.

Usually, the deformed hole at the free end of the guard arm is a rectangular hole that can be loosely fitted to the dead bolt, and the cross section of the groove at the front end of the dead bolt is usually circular, at least part of a circle. The guard arm can be tilted with the front end of the deadbolt and the guard arm engaged.

When the door is slightly opened and the guard arm is tilted, the rectangular cross section in front of the groove of the dead bolt becomes oblique to the deformed hole of the guard arm. Can not be solved.

On the other hand, when the door is opened with the front end of the deadbolt engaged with the free end of the guard arm, the door remains open even though the distance between the support point of the guardarm and the deadbolt does not change. As the distance between the frame and the deadbolt increases, the deadbolt slides upward on the slider.

Since a long dead bolt hole is opened in the front plate in the vertical direction, the dead bolt hole extends forward (outward) from the front plate.
Even if the dead bolts protruding upwards slide up, they do not interfere with the front plate. Thus, claim 1
The locking mechanism described in (1) can prevent the guard arm from digging due to the movement of the dead bolt, and secures the operation of the guard arm device.

If the slider is placed in the locked position after the door is closed, the tip of the deadbolt is inserted into the deadbolt insertion hole of the door frame with the guard arm pierced, and the locked state is obtained by the conventional guard arm lock. It is the same as in

The locking mechanism according to the second aspect of the present invention
A spring member biases the dead bolt in a vertical direction toward the normal position. In other words, the deadbolt is resiliently pressed to the slider at the upper or lower end of its moving range.

If the dead bolt is pressed to the lower end position, the operation of the locking mechanism is the same as that according to the first aspect of the present invention. The only point at which the dead bolt goes up against the spring resilience in addition to gravity when the bolt goes up.

When the dead bolt is resiliently pressed to the upper end position of the moving range of the slider, the support point of the guard arm is set downward, and the deformed hole for engaging with the dead bolt is arranged above. The operation of the guard arm device can be ensured.

The locking mechanism according to the third aspect of the present invention
A guide pin protruding from the side surface of the deadbolt is engaged with a T-shaped guide groove fixed in the lock box. Even so (so-called inverted T-shape), the dead bolt can move in the front-rear direction only when it is in the normal position in the vertical direction,
The dead bolt can move up and down only when the slider is in the guard arm operating position in the front-rear direction.

Therefore, even if the dead bolt is not normally biased by the spring member in the normal position direction, the dead bolt is normally settled in the normal position, and when the slider is in the locked position and the unlocked position, Even if the dead bolt is moved in the vertical direction by hand, the dead bolt cannot be moved, and malfunctions due to the mischief of the dead bolt are effectively prevented.

Further, the normal position of the dead bolt may be the upper end of the moving range of the slider.

The function of the locking mechanism according to the fourth aspect of the present invention is the same as the function of the locking mechanism according to the third aspect of the present invention. Similarly, in the vertical direction, the dead bolt is constantly urged in the direction toward the normal position by the elastic force of the spring member, so that even when the slider is at the guard arm operating position, the dead bolt is Do not fall along.

The other operations are the same as those of the locking mechanism according to the third aspect of the present invention, so that further detailed description will be omitted.

[0032]

Embodiments of the present invention will be described below with reference to the drawings. The invention described in claim 4 will be described for convenience of explanation. The invention described in claims 1 to 3 may be considered by omitting the spring member, the guide mechanism, or both from the invention described in claim 4.

In FIG. 1, reference numeral 1 denotes a lock box, and this lock box 1 is embedded in the free side edge of the door. Inside the lock box 1, a slider indicated by reference numeral 2 is guided so as to be movable in the front-rear direction (left and right direction in FIG. 1) perpendicular to the front plate 3 of the lock box 1.

The slider 2 in the embodiment shown in FIG.
The second slider plates 4, 5 are integrally connected to each other via a gap for holding the dead bolt 6, and the overall shape is a substantially laterally T-shaped frame.

The slider 2 in the illustrated embodiment is held by the lock box so that the outer surface of the frame having a flat rectangular cross section is in sliding contact with the inner surface of the lock box 1, and moves in the front-rear direction. Guided as possible.

The slider 2 is engaged with the dead cam 7 and the auxiliary dead cam 8 connected to the thumb turn on the indoor side, and the unlocking position shown in FIG. 1, the guard arm operating position shown in FIG. It is configured to be selectively placed in the locking position shown.

That is, in the slider 2 of FIG. 1, a substantially rectangular driven notch 11 connected to the stop edge 9 is formed at the upper end edge of the inner end of the first slider plate 4 on the front side. Turn the thumb turn to move the dead cam 7 90 degrees clockwise in FIG.
By turning it clockwise, the dead cam 7 engages with the driven cutter 11 to protrude the slider 2 to the left (forward), and the tip of the dead bolt 6 carried by the dead cam 7 is moved to the door frame as shown in FIG. A guard arm 12 to be described later mounted on the side is pierced and inserted into a deadbolt insertion hole 14 opened in the strike 13 to lock the door. At the same time, the tip of the dead cam 7 rides on the stop edge 9 of the first strike plate 4.

On the other hand, when operating the guard arm device, as shown in FIG. 3, the thumb turn is turned from the inside of the door, and the auxiliary dead cam 8 which forms a part of the ring of the snake is rotated clockwise by 45 degrees. Let it.

Then, the tip of the auxiliary dead cam 8 pushes forward the operating edge 15 formed on the second slider plate 5 of the slider, and the front end of the dead bolt 6 is opened at the lower end (free end) of the guard arm 12. Into the engaged hole 16 (see FIG. 4).

The unlocking position (FIG. 1), the guard arm operating position (FIG. 3) and the locking position (FIG. 2) of the above-mentioned dead cam 7 and slider 2 are each metastablely held by a well-known click device 17. With the click device 17
Gives a crisp click feeling to the person who operates the thumb turn.

Incidentally, it is manually operated through the thumb turn,
The slider driving mechanism for selectively placing the slider 2 in the unlocking position, the guard arm operating position and the locking position is not limited to the one shown in the drawings, but is a known dead-lock type of various guard-arm locks conventionally proposed or already used. A bolt drive mechanism can be employed.

On the other hand, between the first and second slider plates 4 and 5 constituting the slider 2, a dead bolt 6 is movably supported in the vertical direction.

The dead bolt 6 in the illustrated embodiment is
As shown in FIGS. 2, 3 and 5, the cross section is a rectangular block having a flat cross section, and the front end (left end in FIGS. 2 and 3) of which is open to the free end of the guard arm 12. A groove 18 for engaging with the engagement hole 16 (see FIG. 4) is formed.

As shown in FIG. 5, the cross section of the groove is, for example, oval or circular, and when the groove 18 and the engagement hole 16 of the guard arm are engaged, the guard arm 12 can be tilted.

As shown in FIG. 3, a guide rod 19 is vertically provided between the first and second slider plates 4 and 5 so as to vertically pass through the dead bolt 6. As shown in FIG. 2, a guide pin 21 protruding from the side surface of the dead bolt 6 is slidably engaged with a vertically long guide hole 22 opened in the first slider plate 4.

With the above-described structure, the dead bolt 6 is guided so as to be vertically movable on the slider 2.

A portion of the guide rod 19 above the dead bolt 6 is provided with a dead spring 23 as a compression coil spring.
Is wound. The dead bolt 6 is resiliently moved by the dead spring 23 in the normal position (the slider 2 shown in FIGS. 1 and 3) which is aligned with the dead bolt insertion hole 14 (see FIGS. 2 and 4) of the strike 13 in the vertical direction. (The lowermost position in FIG. 2).

On the other hand, the tip of the guide pin 21 protruding from the side surface of the dead bolt 6 protrudes outside the slider 2 so as to penetrate the first slide plate 4 from inside, and the lock box 1 shown in FIGS. 3 is slidably engaged with an inverted T-shaped guide groove 24 opened on the other side plate (side plate that slides on the first slider plate 4) not shown in FIG.

The vertical position of the horizontal bar portion of the guide groove 24 is set so as to be able to engage with the guide pin 21 when the dead bolt 6 is at the normal position as shown in FIGS. I have.

The position of the vertical bar portion of the guide groove 24 in the front-rear direction is such that the guide pin 21 is aligned with the guide pin 21 when the slider 2 is placed in the guard arm operating position, as shown in FIG. Is set.

In order to avoid interference with the dead bolt 6 which moves in the vertical direction, the front plate 3 of the lock box 1
As shown in FIG. 5, a long deadbolt hole 25 is opened in the vertical direction.

In FIGS. 1 to 3 and 5, reference numerals 26 and 27 indicate first and second shutters, respectively. These first and second shutters 26 and 27 are not shown at the side edges. The lug is slidably engaged with an elongated shutter guide groove (not shown) opened in the side plate of the lock box 1 so as to be vertically movably guided. Shall be

The shutters 26 and 27 are urged downward by the acceleration of gravity, and when the dead bolt is in the normal position, it is lowered to the lowermost position as shown in FIG.
It operates so as to close a portion of the deadbolt hole 25 above the deadbolt 6, but this is not an essential component of the present invention.

The locking mechanism according to one embodiment of the present invention configured as described above, when the guard arm device is not operated, that is, when the slider 2 is in the unlocked position (see FIG. 1).
And when it is in the locked position (see FIG. 2), the dead bolt 6 and the slider 2 are integrally connected in the front-rear direction, so that they operate in the same manner as a normal locking mechanism of a lock.

Since the locking mechanism according to the first and second aspects of the present invention does not have the T-shaped guide groove, the dead bolt can move upward when the slider 2 is at the unlocking position. However, when unlocking, that does not have any adverse effect on the lock.

Move the slider 2 to the guard arm operating position (FIG. 3).
), The groove 18 at the front end of the dead bolt 6 engages with the engagement hole 16 opened at the free end of the guard arm as described above.

When the door is opened in this state, the dead bolt 6 slides up in the dead bolt hole 25 as shown in FIG. 6 to prevent the dead bolt 6 and the guard arm 12 from digging.

[0058]

As is apparent from the above description, according to the present invention, the dead bolt is carried on the slider, and the dead bolt can be moved vertically with respect to the slider when the guard arm is operated. The digging between the deadbolt and the guard arm can be absorbed in the form of vertical movement of the guard arm, so the guard arm does not need to be provided with a mechanism for absorbing the digging. Can be configured.

The fact that the guard arm can be made of a thin plate material allows the guard arm to be housed in the dust even if the door frame is not largely notched, and simplifies the processing of the door frame of the door opening. In addition, various effects such as the strength of the door frame can be improved.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a guard arm lock having a locking mechanism according to an embodiment of the present invention, showing a state where a slider is in an unlocked position.

FIG. 2 is a cross-sectional view of a guard arm lock having a locking mechanism according to an embodiment of the present invention, showing a state where a slider is in a locked position.

FIG. 3 is a cross-sectional view of a guard arm lock having a locking mechanism according to an embodiment of the present invention, showing a state where a slider is in a guard arm operating position.

FIG. 4 is a front view of a strike equipped with a guard arm.

FIG. 5 is a front view of a front plate of the lock box.

FIG. 6 is a front view of a strike showing an operating state of the guard arm device, and shows a front plate of the lock box by a chain line.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Lock box 2 Slider 3 Front plate 6 Dead bolt 7 Dead cam 8 Auxiliary dead cam 12 Guard arm 13 Strike 14 Dead bolt insertion hole 16 Engagement hole 18 Groove 19 Guide rod 23 Dead spring 24 Guide groove 25 Dead bolt hole

Continuation of the front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E05C 17/06 E05B 65/06

Claims (4)

(57) [Claims] In the lock box, it is guided so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, and is selectively turned by a thumb turn into an unlocking position, a locking position, and a guard arm operating position intermediate therebetween. And a dead bolt that is carried by the slider, has a groove at the front end that engages with the free end of the guard arm, and is guided in the slider so as to be movable in the vertical direction. A guard arm locking mechanism for a guard arm lock, wherein a long dead bolt hole is opened in a vertical direction on the plate to avoid interference with a dead bolt moving in a vertical direction. 2. In the lock box, the lock box is guided so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, and is selectively turned by a thumb turn into an unlocking position, a locking position, and a guard arm operating position intermediate therebetween. And a dead bolt which is carried by the slider and is formed at the front end thereof to engage with the free end of the guard arm, and which is guided in the slider so as to be movable in the vertical direction. A spring member that urges in a direction toward a normal position aligned with the dead bolt input hole of the strike of the door frame in the vertical direction, and the front plate has an interference with the dead bolt moving in the vertical direction. A guard arm locking mechanism for a guard arm lock, wherein a long dead bolt hole is opened in a vertical direction in order to avoid trouble. 3. The lock box is guided in the lock box so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, and is selectively turned by a thumb turn into an unlocking position, a locking position, and a guard arm operating position intermediate therebetween. And a dead bolt guided on the slider so as to be able to move in the vertical direction while forming a groove at the front end of the slider, the groove being engaged with the free end of the guard arm. Fixed
A T-shaped guide groove extending in a plane parallel to the side number of the lock box, and a guide pin protruding from a side surface of the dead bolt and engaging with the guide groove, the dead bolt is provided in a vertical direction. When the guide pin is engaged with the horizontal bar portion of the guide groove when in the normal position aligned with the deadbolt insertion hole, and when the slider is in the guard arm operating position in the front-rear direction, the guide pin is in the vertical position in the guide groove. A guard mechanism having a guide mechanism adapted to be engaged with a portion, and a front plate provided with a vertically extending long dead bolt hole in order to avoid interference with the dead bolt moving in the vertical direction. Guard locking mechanism for arm lock. 4. In the lock box, the lock box is guided so as to be movable in the front-rear direction perpendicular to the front plate of the lock box, and is selectively operated by a thumb turn in an unlocking position, a locking position, and a guard arm operating position intermediate therebetween. And a dead bolt guided on the slider so as to be able to move in the vertical direction while forming a groove at the front end of the slider, the groove being engaged with the free end of the guard arm. Fixed
A T-shaped guide groove extending in a plane parallel to the side number of the lock box, and a guide pin protruding from a side surface of the dead bolt and engaging with the guide groove, the dead bolt is provided in a vertical direction. When the guide pin is engaged with the horizontal bar portion of the guide groove when in the normal position aligned with the deadbolt insertion hole, and when the slider is in the guard arm operating position in the front-rear direction, the guide pin is in the vertical position in the guide groove. A guide mechanism adapted to engage with the portion, and a spring member for urging the dead bolt in a vertical direction toward a normal position aligned with the dead bolt insertion hole of the strike of the door frame. A guard arm locking mechanism for a guard arm lock, wherein a vertically long dead bolt hole is opened in the front plate to avoid interference with a dead bolt moving in the vertical direction.