JPH0239019Y2 - - Google Patents

Description

[Detailed description of the invention] <Industrial field of application> The disclosed technology belongs to the technical field of the structure of door locks attached to doors of houses, etc.

<Summary> This invention is based on a latch bolt provided at the tip of a metal cylindrical casing with a circular cross section attached to the edge of a house door, etc. This invention relates to the structure of a door lock that is movable back and forth through the casing, is connected to a handle attached to the outside of the door, and is connected to the tip of the link. A link linked to the tip of the lever of the linked rotating body engages with the rear end of the bar-shaped part of the latch bolt via a fork, etc., and a guide bush for the lever-shaped part and a spring piece linked to the protrusion of the rotating body are connected. This invention concerns the structure of a door lock in which a compression spring is interposed.

<Prior art> As is well known, there are so-called box locks for locks installed on the doors of houses, etc., but due to their large size and weight, they are difficult to handle, including installation to the door. So-called tubular type door locks have been developed, such as the lock shown in Utility Model Publication No. 53-36317, in which a latch bolt is installed at the tip of a metal casing buried inside the door. The slider is installed inside the casing so as to be movable back and forth via a return spring, and is integrally installed at the tip of the slider, which has a pinion and a rack linked to a lever handle etc. attached to the outside of the door. It was hot.

<Problem that the invention is trying to solve> However, in the structure of the conventional type of door lock mentioned above, a rack and pinion are used, so it is necessary to ensure sufficient stroke for the rack installed in the casing. Therefore, it has a large shape and structure, and when it is assembled into the door, a large hole must be made in the door, resulting in a disadvantage that the strength of the door is weakened.

In addition, in order to obtain a sufficient amount of retraction of the latch bolt, the turning angle of the lever handle must be made large, and from this point of view as well, there was an inconvenience that the casing had to be made larger.

This also applies to the device disclosed in Japanese Utility Model Publication No. 51-41025, for example.

In addition, there is the disadvantage that the manufacturing cost required for molding the rack and pinion is high, and the assembly work with the handle requires precision, which adds extremely complicated work, which leads to high costs. It was hot too.

For example, as shown in the tubular type lock disclosed in JP-A-50-1900, a link is interposed between a lever of a rotary body connected to a rotary handle and a latch bolt. However, although there is a degree of freedom in the connection between the tip of the link and the latch bolt, the size of the latch bolt must be increased to the rear end, and the size and weight of the latch bolt must be increased accordingly. It also had the disadvantage of becoming larger, making it inconvenient to handle, and making it difficult to fit inside the casing, resulting in higher costs.

<Purpose of the invention> The purpose of this invention is to solve the technical problem of the structure of the door lock based on the above-mentioned conventional technology, and to create a simple structure that can be manufactured compactly and with a small number of parts. to improve assembly workability,
The purpose of the present invention is to provide an excellent door lock structure that can greatly reduce manufacturing costs, has good durability, and has good serviceability, thereby benefiting the field of crime prevention and safety technology application in the construction industry. .

<Means/effects for solving the problem> In order to solve the above-mentioned problem, the structure of this invention, which is based on the scope of the above-mentioned utility model registration claim, is to solve the above-mentioned problem. When the handle of a tubular type door lock attached to the door is rotated, a rotating body linked to the handle pivotally supported on the casing of the door lock attached to the door rotates within the casing, and the rotating body A link, such as a pin supported by a pin at the tip of a lever provided integrally and outwardly, is pulled rearward by a resilient spring between a spring piece that interlocks with a protrusion of the rotating body and a guide bush in the casing. The latch bolt in the casing, which engages with the rear end of the bar-shaped portion of the link and rod, moves rearward against the return spring, thereby unlocking the door from the opposing latch hole. When the door is opened and the handle is released, the latch bolt protrudes through the return spring and the handle is reset to its initial position by the compression spring.On the other hand, when the door is closed, when the door is pressed, the latch bolt protrudes through the tapered part of its head. Through the cam action, the return spring is penetrated, moved inward, and engaged with the latch hole to lock and close the door.

<Example> Next, an example of this invention will be described below based on the drawings.

Reference numeral 1 refers to a door provided at the entrance of a private residence, which is pivoted to a door post via a predetermined hinge so as to be openable and closable, as in the conventional general case, and a mounting plate attached via screws (not shown). 2, and a dead bolt lock (not shown) linked to the handle 3 and embedded in a corresponding position of a latch (not shown) of the door post; and a tubular type which forms the center of the gist of this invention. It has a door lock 4.

As shown in FIG. 3, on the tip side of the cylindrical predetermined metal casing 5 of the door lock 4, there is a hole near the upper side in the figure of the inward guide bush 6 of the cylindrical casing 5. A latch bolt 8 is inserted through the bar-shaped portion 7 of the rear rod and guided, and a truncated cone-shaped return spring 9 with a shortened compression length is interposed between the latch bolt 8 and the guide bush 6.
It is incorporated into the cylindrical casing 5 by a front plate 11 via a support plate 10 integrally attached to the tip of the cylindrical casing 5, and a flange is provided at the rear end of the bar-shaped portion 7 of the rod of the latch bolt 8. Part 1
2 is provided.

Therefore, the latch bolt 8 and the bar-shaped portion 7 of the rod are provided above the center line of the casing 5 in the setting amount diagram.

On the other hand, on the base end side of the cylindrical casing 5 of the door lock 4, as shown in FIG. A cylindrical rotating body 14 is inserted into the square hole 1 inside the rotating body 14.
The square core rod of the handle 3 can be freely inserted into the rotating body 14, and an arc-shaped protrusion 16 is integrally formed at a predetermined position on the outer peripheral surface of the rotating body 14, as shown in FIGS. 3 and 4. The rotating body 14 is formed like a guide bush 6.
By indirectly engaging the elastic spring 17 mounted between the handle 3 and the handle 3 in one direction via the spring piece 18, the handle 3 is urged in one direction via the spring piece 18.

As described above, since the bar-shaped portion 7 of the rod is provided upward in the figure from the center line of the casing 5, there is sufficient space for installing the lower elastic spring 17 and the spring piece 18 inside the casing 5. It is formed with

A lever 1 of a set length is provided at another predetermined portion on the outer peripheral surface of the rotating body 14 on the opposite side to the protrusion 16.
9 is provided integrally and outwardly extending, the base end of a substantially L-shaped link 20 is pivotally supported on the lever 19 by a pin 21, and the inner surface 25 of the fork portion at the front end of the link 20 is connected to the latch bolt. It is hooked to the rear end flange portion 12 of the bar-shaped portion 7 of the rod 8.

A sliding surface 23 of the spring piece 18 is formed smoothly on the inner surface of the cylindrical casing 5, and a notch 24 is provided diagonally above the lever 19 of the rotating body 14 in the figure. The rotational length of the tip of the lever 19 is made sufficiently large, so that the operating length of the link 20, that is, the amount of movement of the bar-shaped portion 7, can be made sufficiently large. interference is avoided.

In the above configuration, when opening the closed door 1 to enter or exit the house, after unlocking the dead bolt lock in a predetermined manner, the handle 3 is inserted into the compression spring 17 in the direction of the arrow in FIG. 2 and operated downward.
The square core rod of the handle 3 rotates the rotating body 14,
The spring 17 is compressed by the protrusion 16 of the rotating body 14 via the spring piece 18 to apply an appropriate operating load to the handle 3, and the rotating body 1
The tip of the lever 19 of No. 4 rotates greatly while protruding from the notch 24 of the cylindrical casing 5, and the latch bolt 8 is pulled back against the flange portion 12 of the inner surface 25 of the fork portion via the link 20.
into the return spring 9 to retract it by a sufficient amount.

At this time, the rear end flange portion 12 of the bar-shaped portion 7 of the rod that is loosely inserted into the hole of the guide bush 6 of the latch bolt 8 is positioned relative to the inner surface 25 of the fork portion of the link 20 as shown in FIGS. Since the return spring 9 is formed at an angle to the movement of the link 20 while maintaining a secure contact relationship, the return spring 9
The latch bolt 8 is smoothly retracted.

Furthermore, since the lever 19 protrudes from the notch 24 of the casing 5 and has a sufficient length, even if its turning angle, that is, the turning angle of the handle 3 is small, the turning length of the tip of the lever 19 is sufficient. Therefore, the amount of retraction of the link 20, that is, the latch bolt 8, also becomes sufficiently large.

Then, the latch bolt 8 retreats into the cylindrical casing 5, the door lock 4 is unlocked and the door 1 is opened, and when the handle 3 is released, the latch bolt 8 protrudes due to the biasing force of the return spring 9, and the handle 3 is returned to the initial position by the elastic spring 17.

Then, when entering the room and closing the door 1, the latch bolt 8 impinges on the return spring 9 by a cam action against the latch hole of the door post and retreats once in the same manner as in conventional systems (the bar-shaped part 7 of the rod is a link After the fork part 20 is slid back in a loosely inserted state), the return spring 9 re-projects due to the spring back and engages with the latch hole, and the door lock is locked. During this time, the compression spring 17 does not affect the movement of the latch bolt 8 in any way.

Although not shown, the door lock 4 is provided with a handle for the inside of the house as in the general case.

Therefore, when closing the door 1, the forward and backward movement of the latch bolt 8 is not transmitted to the link 20 due to the locking engagement relationship between the link 20 and the flange 12 of the bar-shaped portion 7 of the rod of the latch bolt 8. , no extra operations and less wear.

It is needless to say that the embodiment of this invention is not limited to the above-mentioned embodiment. For example, the biasing direction of the latch bolt and the biasing force for returning the rotating body to its initial position may be provided by a return spring. Various methods can be adopted, such as connecting the flange of the latch bolt and the arm by a sliding pin pivot.

In addition, the handle is not limited to the lever type, and of course can also be adapted to a ball type, thumb turn type, etc. in terms of design.

<Effects of the invention> As described above, according to this invention, the number of parts can be basically reduced in a tubular type door lock, and furthermore, there is no need to use a rack or pinion, and the stroke of the rack can be secured. Since the space for the door can be saved, it can be manufactured compactly, and the workability when attaching it to the door is also good, resulting in an excellent effect of significantly reducing costs.

Furthermore, since the number of parts is small, assembly errors are small, and an excellent effect of reliable operation is achieved.

Furthermore, since the link engaged with the tip of the lever, which is integrated with the rotating body linked to the handle pivoted on the casing, is engaged with the rear end of the bar-shaped portion of the rod of the latch bolt, the rotational movement is directly controlled. The latch bolt moves forward and backward, resulting in a simple structure and fewer failures.

Furthermore, since it is possible to increase speed simply by making the lever integrated in the rotating body sufficiently long, an excellent effect is achieved in that the latch bolt can be sufficiently retreated with a small rotation angle of the handle. .

Even if the lever of the rotating body is made long enough, it can be moved freely into and out of the notch in the casing, so even if the rotation angle of the handle is small, the turning length of the tip of the lever can be extended. This provides an excellent effect in that the latch bolt can be sufficiently retracted through the link.

Furthermore, even if the lever of the rotating body makes a large turning movement, the link is indirectly interposed between the rear end of the latch bolt, so that there is no unreasonable movement between the turning movement of the lever and the backward movement of the latch bolt. This has the advantage that no engagement relationship occurs and smooth movement can be performed via the link.

In addition, a compression spring is interposed between a guide bush from the casing for the bar-shaped portion at the rear end of the latch bolt and a spring piece that is linked to a protrusion integrated into the rotating body, allowing for large handle rotation when opening the door. A reliable opening load is applied by force, ensuring the return of the handle when closing the lock, and the return of the latch bolt is applied by a return spring, so the mechanism is simple but has the effect of being able to differentiate the action. be.

By interposing the compression spring, the center line of the latch bolt can be shifted, so that the tip of the lever, which is integrated with the rotating body, is linked to the bar-shaped portion at the rear end of the latch bolt via a link. As a result, the size of the latch bolt is reduced, which has the advantage that the design can be made more compact, and there is also the effect that the amount of material required for molding can be reduced, thereby reducing costs.

[Brief explanation of the drawing]

The drawing represents one embodiment of this invention,
Figures 1 and 2 are perspective views of the locking mechanism inside the door;
Figures 4 and 5 are cross-sectional views, and Figures 6, 7, 8, and 9 are partial perspective views. DESCRIPTION OF SYMBOLS 1...Door, 5...Tubular casing, 8...Latch bolt, 9...Return spring, 3...Handle, 20...
Link, 6...Guide button, 4...Door lock, 14...
Rotating body, 19...Lever, 21...Pin, 16...Protrusion, 24...Notch, 18...Spring piece, 1
7...Oppression spring.

Claims (1)

[Scope of utility model registration request] A latch bolt provided at the tip of a cylindrical casing attached to the door returns inside the cylindrical casing and is movable back and forth via a spring, and a latch bolt is attached to the tip of a link linked to a handle inserted on the outer surface of the door. In the structure of the linked door lock, a lever of sufficient length is provided integrally with a rotary body that is pivotally supported by the casing and linked to the handle, and its tip is retractable from the notch of the casing. The linked link is engaged with the rear end of the bar-shaped part of the latch bolt, and a compression spring is provided in the casing between a spring piece that is linked to a projection integral with the rotating body and a guide bush of the bar-shaped part. A structure of a door lock characterized by an interposed door lock.