JPH09177391A - Door lock - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify the structure of a door lock and prevent recoil of a latch by fitting a latch holder of a resilient body to the inside of a case in a door lock adsorbing a magnet of the edge of a latch bolt which is one magnet in the strike box of a frame. SOLUTION: A cylindrically formed latch holder 25 is fitted to the inner circumferential face of the case 20 of a door lock with a magnetic substance. A fitting groove is provided on the head part 28 of a latch bolt and a magnet 37 inserted in a synthetic resin made magnet cover 34 is attached thereto. A shaft part is detachably connected to the drive arm 46 of a hub 44 through a retractor 40 and a hub lever 56 sliding along the inner face of the case 20. On the other hand, a magnet 63 is attached to the inside of the strike box 60 of a box B, and coated with a magnet cover 64. When a door is closed, the magnet 37 is sucked to the magnet 63, the latch bolt is protruded from a front 23, and the door is closed. When a handle is operated and the hub 44 is rotated clockwise, the retractor 40 retracts the latch bolt, the magnet 37 is sucked and held to the latch holder 25, the door is opened, and the hub lever 56 is in a neutral state.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a door lock for striking and holding a protruding latch by a magnet built in the head of a latch bolt.

[0002]

2. Description of the Related Art Some door locks include an empty lock (latch lock) having a latch bolt and a main lock having a dead bolt. In a general latch lock, a latch bolt having an inclined surface at the tip is urged by a spring in a direction protruding from the case, and when the door is closed, the inclined surface hits a strike and the latch bolt is pushed in the retracted direction, and when the door is completely closed. The latch bolt engages with the strike hole to temporarily tighten the door, and when the door handle is operated, the latch bolt retracts against the biasing force of the spring and releases the engagement with the strike, allowing the door to open. Becomes

Therefore, when the door is closed, a large impact sound is generated when the inclined surface collides with the strike, a sliding sound is generated when the latch bolt slides into the insertion hole of the case, and the tip of the latch bolt slides on the surface of the strike. Sliding noise of contact is added. Further, the spring for urging the latch bolt in the protruding direction is impacted and compressed by the latch bolt when the door is closed, and is compressed by the handle operation when the door is opened. Therefore, metal fatigue reduces the life.

For the purpose of avoiding such a problem, there is a door lock of a type in which the latch bolt is sucked and held in the strike without engaging the latch bolt in the hole of the strike (see Japanese Utility Model Publication No. 2-39021). The outline of this door lock will be described with reference to FIG. 12. An insertion hole 2 is provided in the front surface of the case 1 fixed to the end of the surface of the door D, and the insertion hole 2
The soft iron piece 4 is built into the tip of the latch bolt 3 inserted into the frame, and the frame side (or the other door side) is attached to the resin mounting frame 5 that is mounted at a position facing the door lock when the door is closed. Built-in 6.

At both ends of a pin 7 and a latch bolt 3 provided inside the case 1, both ends of a tension spring 8 having a weaker attracting force than the magnet 5 are locked, and the latch bolt 3 is biased in the retracting direction. To be done. Notch recess 9 formed in the latch bolt 3
Then, the drive arm 11 which rotates about the pin 10 as a fulcrum by the handle operation is engaged, and the tension spring 13 is stretched between the drive arm 11 and the pin 12 in the case 1 to move the drive arm 11 to the case 1.
It is urged in the direction of hitting the inner stopper 14.

In the door lock constructed as described above, the soft iron piece 4 of the latch bolt 3 is attracted by the magnet 6 when the door is closed, and the door D
Are kept closed. When the door is closed and the drive arm 11 is rotated by operating the handle to immerse the latch bolt 3 in the case 1, the soft iron piece 4 separates from the magnet 6.
When the door is opened, the soft iron piece 4 that has moved away from the magnet 6 loses the attraction force of the magnet 6 and is held in the retracted position by the spring 8. When the door is closed and the handle is released, the soft iron piece 4 is attracted by the magnet 6, the latch bolt 3 projects again, and the drive arm 11 returns to the position where it hits the stopper 14.

[0007]

In the door lock constructed as described above, a large impact noise caused by the latch bolt 3 colliding with the strike and a sliding noise caused by the tip of the latch bolt 3 slidingly contacting the surface of the strike. It disappeared, but the following problems remained. (1) When the handle is released after closing the door, the latch bolt 3 attracting the soft iron piece 4 to the magnet 6 projects from the case 1 against the spring 8 and the attraction force of the magnet 6 increases as it approaches the resin mounting frame 5. Therefore, there is a risk that the latch bolt 3 which collides violently with the resin-made mounting frame 5 and which can be rebounded by the elastic force of the resin-made mounting frame 5 sinks into the case 1 by the biasing force of the spring 8.

(2) Since the spring 8 repeatedly expands and contracts each time the door is opened and closed, there is a problem that the life of the spring 8 is shortened. The present invention aims to solve such problems,
The present invention provides a door lock that does not violently strike the strike when the latch bolt is projected without using a spring that biases the latch bolt in the retracted direction.

[0009]

In order to achieve the above object, the present invention provides a case which has a front attached to an end face of a door and an insertion hole is provided in the front, and a hub which is rotated by a handle operation. In a door lock provided with a latch bolt protruding and retracting from the insertion hole by the rotation of the hub, a latch holder formed of a magnetic material in a cylindrical shape is fitted into the insertion hole, and a strike facing the door end surface is formed. Provided with a magnet, the tip of the latch bolt inserted into the latch holder and capable of abutting the strike on the head of the latch bolt,
By providing a magnet for attracting each other with respect to the strike magnet, the head portion of the latch bolt is attracted and held by the latch holder when retracted, and attracted and retained by the strike magnet when protruding. It is what

The magnet provided on the head of the latch bolt is
It is preferable that the case is housed in a case made of synthetic resin, and the case comes into contact with the strike.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION A specific example of an embodiment of the present invention will be described with reference to the drawings. FIG. 1 is a vertical sectional view showing a relationship between a door lock and a strike in a closed state, and FIG. Fig. 3 is a longitudinal sectional view showing the relationship between the door lock and the strike in Fig. 3, Fig. 3 is a sectional view of the door lock in the open state, Fig. 4 is a front view of the door lock, and Fig. 5 is a perspective view of main parts constituting the inside of the door lock. It is a figure. The door lock case 20
The cylindrical body whose rear end (the right end in FIG. 1) is closed,
The tubular body is divided into two along the longitudinal direction, and a case cover 20b (a part of which is shown in FIG. 1) is superposed on one of the case bodies 20a and screwed to be assembled into the original tubular shape. .

The second front end 21 extending from the front end of the case body 20a is a rectangular plate shaped long in the vertical direction.
An insertion hole 21a that matches the inner peripheral surface of the case 20 is provided, and holes 22 are formed in the upper and lower portions. The front 23 attached to the front surface of the second front 21 is formed in the same shape as the second front 21, and has an insertion hole 23a overlapping the insertion hole 21a and a hole 24 overlapping the hole 22. The cylindrical portion 2 protruding from the peripheral edge into the hole 24 and fitted into the hole 22 of the second front 21.
4a is provided (see FIG. 1).

A bolt (not shown) inserted into the holes 24 and 22 from the front of the front 23 is screwed into the end surface of the door D, and the case 20 is fixed to the end surface of the door D. A latch holder 25 formed of a magnetic material in a tubular shape is fitted to the inner peripheral surface of the case 20, and a synthetic resin latch guide 26 formed in a tubular shape and having a flange 26a at the end is provided from the front side of the front 23. It is inserted into the insertion holes 21a and 23a and fitted to the inner peripheral surface of the case 20 (see FIGS. 1 and 5).

The latch bolt 27 has a head portion 28 inserted into the latch guide 26 and the latch holder 25, and a head portion 28.
The shaft portion 29 is provided on the rear end surface of the shaft portion 29, and the collar portion 30 is provided at the rear end portion of the shaft portion 29. A fitting groove 31 that penetrates both side surfaces of the head portion 28 is provided at the tip of the head portion 28, and a groove 32 that intersects with the fitting groove 31 and opens at the tip of the head portion 28 is formed substantially in the middle of the fitting groove 31. A rectangular recess 33 formed on the bottom surface of the fitting groove 31 is formed (see FIGS. 1 and 5).

The magnet case 34 to be inserted into the fitting groove 31 is formed in a quadrangular frame shape from a non-magnetic material, and the front end surface thereof is provided with a projection 35 protruding in the vertical direction to be engaged with the concave groove 32, and the rear end surface thereof. A quadrangular protrusion 36 to be inserted into the recess 33 is provided on the. The magnet case 34 is inserted into the fitting groove 31 after the magnet 37 is inserted thereinto, and the roll pin 39 is fitted into the small hole 38 penetrating the head portion 28 and the rectangular protrusion 36, so that the magnet case 34 and the magnet 37.
Is attached to the inside of the head 28 (see FIGS. 1 and 5).

The retractor 40 slidable along the inner wall surface of the case 20 is provided with a square hole 41 at substantially the center thereof. The retractor 40 has a bent wall 42 bent at a right angle from the tip of the retractor 40 and an end of the bent wall 42. An elongated hole 43 that opens is provided, and the shaft portion 29 of the latch bolt 27 is inserted into the elongated hole 43. The case 20 is provided with holes (not shown) penetrating the case body 20a and the case cover 20b, and small-diameter portions 45 formed on both end surfaces of the hub 44 are rotatably inserted into both holes. (See FIGS. 1 and 5).

The hub 44 is provided with a pushing arm 46 and a pushed arm 47 protruding from the outer peripheral surface, and two spring supporting protrusions 48 are provided on the surface of the pushed arm 47. The square shaft portion 50 formed at the end of the door handle is inserted into the square hole 49 penetrating the center of the hub 44.

Two spring support protrusions 52 are provided on a spring support seat 51 (see FIG. 1) provided on the inner wall surface of the case 20 (see FIG. 7), and one ends of the spring support protrusions 52 are locked to the spring support protrusions 52, respectively. The other ends of the two springs 53 are locked to the spring support protrusion 48. Therefore, the hub 44 is biased counterclockwise in FIG. 1, and the pushed arm 47 is in contact with the inner wall surface of the case 20.

On the inner surfaces of the case body 20a and the case cover 20b, there are provided holes 54 having bottoms which face each other.
A bearing bush 55 is inserted into the bottomed hole 54 (see FIG. 8). One end 56 a of the hub lever 56 is inserted into the square hole 41 of the retractor 40, and the pushing arm 46 of the hub 44 is inserted.
A support shaft 57 that is inserted into the bearing bush 55 is provided at a position close to the other end 56b that can be brought into and out of contact with the other end (see FIGS. 5 and 8). A curved surface that does not prevent rotation of the hub lever 56 is provided on the inner surface of the case. 58 and a column 59 for restricting the rotation amount of the hub lever 56 are provided (see FIG. 1).

The strike S provided on the frame B (or the opponent door) has a magnet 6 inside the strike box 60.
3, the magnet cover 64 is inserted in this order, and the strike member 65 that covers the strike box 60 is attached (see FIGS. 6, 9, and 10). In the strike box 60, a recess 61 for accommodating the magnet 63 is formed in the center of a rectangular bottom wall 60a, side walls 60b are erected at both ends in the longitudinal direction of the bottom wall 60a, and side walls 60c are erected at both ends in the width direction. And has a flange 60d that bends outward from the end of the side wall 60b, and a hole 66 is provided in the flange 60d (see FIG. 6). As shown in FIG. 10, the strike box 60 is formed on the surface of the frame B. It is inserted into the recess.

The magnet cover 64 is a recess 6 in which the head 28 of the latch bolt 27 abuts on the surface which becomes the surface of the strike S when it is inserted into the strike box 60.
2 is formed, and a short standing wall 64a is formed around the recess 62.
Is provided (see FIG. 6). The strike member 65 is provided with mounting holes 68 having a tubular portion 68a protruding downward on both sides of a square hole 67 formed substantially in the center, and an inclined surface 69 is formed at one end of the strike member 65.

The cylindrical portion 68a is inserted into the hole 66 of the strike box 60 and then caulked into the hole 66 so that the strike member 65 is moved.
It is fixed to 0 (see FIG. 10), and the strike S is integrally assembled. The strike S is fixed to the frame B by a screw (not shown) inserted into the attachment hole 68.

Next, the operation of the door lock constructed as described above will be described in the order of the closed state, the handle operation, and the opened state with reference to FIGS. Figure 1 shows the door closed,
The pushed arm 47 of the hub 44 is pushed by the spring 53 to rotate counterclockwise and is in contact with the inner surface of the case 20. The head 28 of the latch bolt 27 projects from the front, the magnet 37 in the head 28 is attracted by the magnet 63 of the strike S, and the door D is held in the closed state.

The retractor 40 engaged with the protruding latch bolt 27 is in a position advanced toward the front 23, and the hub lever 56 engaged with the square hole 41 of the retractor 40 is counterclockwise with the support shaft 57 as a fulcrum. It is at an angle rotated (see Fig. 1). In such a closed state,
When the handle is rotated, the hub 44 rotates clockwise along with the angular shaft portion 50 of the handle, the pushing arm 46 of the hub 44 pushes the other end 65b of the hub lever 56, and the hub lever 56 pushes the support shaft 57. It rotates clockwise as a fulcrum (see Fig. 2).

By rotating the hub lever 56 in the clockwise direction,
The retractor 40 retracts, the latch bolt 27 engaging with the retractor 40 is retracted into the front, and the magnet 37 in the head 28 loses the attraction force with the magnet 63 of the strike S and does not hold the door D. At the same time, when it approaches the latch holder 25, it is sucked and held by the latch holder 25. When the handle is released, the hub 44 returns to the angle shown in FIG. 1, and the pushing arm 46 separates from the other end 56b of the hub lever 56. Since the latch bolt 27 remains held in the retracted position and the retractor 40 is in the retracted position, the hub lever 56 is in the neutral state in which it is released from the retractor 40 and the hub 44 (see FIG. 3).

The magnet 37 of the latch bolt 27 has a strike S more than the force of attracting the latch holder 25 which is a magnetic body.
Since the force of attracting the magnet 63 is larger, when the door D is closed, the latch bolt 27 projects and the state shown in FIG. 1 is restored. The latch bolt 27 can freely move between the projecting position and the retracted position without being restricted by the biasing force of the spring.

Since the magnet case 34 at the tip of the latch bolt 27 is made of synthetic resin, the impact when hitting the strike S is alleviated and no metallic noise is generated. Since the front end surface of the magnet case 34 is formed in a plane substantially perpendicular to the protruding / retracting direction of the latch bolt 27, it can be attached to a free door that can be opened / closed in both indoor and outdoor directions.

[0028]

Since the present invention is constructed as described above, it has the following effects. (1) Since the spring for urging the latch bolt in the retracted direction is unnecessary, the number of springs incorporated in the door lock has been reduced.
Fewer springs have the advantages of simpler construction and longer average door lock life. (2) Since the latch bolt can move freely between the projecting position and the retracted position without being restricted by the biasing force of the spring, the magnet on the strike side has an elasticity greater than that of the spring. You don't have to help. Also, there is no danger that the latch bolt will impact on the strike or bounce back in the direction of immersion due to the impact force of the impact.

(3) Since the magnet case at the tip of the latch bolt is made of synthetic resin, the unpleasant metallic noise generated by collision is eliminated. (4) This door lock can be attached to the free door.

[Brief description of the drawings]

FIG. 1 is a vertical sectional view showing a relationship between a door lock and a strike in a closed state.

FIG. 2 is a vertical sectional view showing a relationship between a door lock and a strike when a handle is operated.

FIG. 3 is a cross-sectional view of the door lock in the opened state.

FIG. 4 is a front view of a door lock.

FIG. 5 is a perspective view of main components forming the inside of the door lock.

FIG. 6 is an exploded perspective view of a strike.

FIG. 7 is a front view illustrating a spring support protrusion of a spring support seat of the case.

FIG. 8 is an explanatory view showing a state in which the bearing bush pivotally attaches the hub lever.

FIG. 9 is a partially cutaway front view of the strike.

FIG. 10 is a vertical sectional view of a strike.

11 is a view on arrow X in FIG. 9. FIG.

FIG. 12 is a sectional view illustrating a conventional example of a door lock.

[Explanation of symbols]

 D Door S Strike 20 Case 23 Front 23a Insertion hole 25 Latch holder 26 Latch guide 27 Latch bolt 28 Head 31 Fitting groove 34 Magnet cover 37 Magnet 40 Retractor 44 Hub 46 Drive arm 47 Pushed arm 53 Spring 56 Hub lever

Claims (2)

[Claims] 1. A case having a front attached to an end surface of a door and having an insertion hole formed in the front, a hub rotatable by a handle operation, and a latch bolt protruding and retracted from the insertion hole by the rotation of the hub. In the provided door lock, a cylindrical latch holder formed of a magnetic material is fitted into the insertion hole, a magnet is provided on the strike facing the door end face, and the tip end face is inserted into the latch holder to the strike. The head of the latch bolt is attracted to and retained by the latch holder when it is retracted, and the strike of the strike is generated when the latch bolt head is abutted. Door lock characterized by being attracted to and retained by the magnet. 2. The door lock according to claim 1, wherein the magnet provided on the head portion of the latch bolt is housed in a case made of synthetic resin, and the case abuts on the strike.