JPS5915566Y2 - Strike for door latch bolt - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a strike for a door latch bolt that can automatically sound a chime when a visitor or the like opens the door.

In this invention, when a visitor opens a closed door, the latch bolt retreats from the strike, and the magnet moves in conjunction with this, approaches the reed switch of the chime circuit, and activates the reed switch. When the chime sounds and the door is closed, the shielding frame shields the space between the magnet and the reed switch, preventing the chime from ringing and easily and reliably detecting the presence of guests. To provide a door latch bolt strike that can notify people in the room.

Next, the present invention will be explained based on an embodiment shown in the drawings.

Reference numeral 1 designates a door strike, which is provided with a dead bolt strike 2 at the top and a latch bolt strike 3 at the bottom, and is attached to a door receiver 4 such as a pillar in correspondence with a door lock.

A fixed frame 6 is provided on the upper opening side of the frame 5 with its opening facing the opening of the frame 5.

Projections 6b are protruded from both sides of the vertical plate portion 6a of the fixed frame 6, and the projections 6b are fitted into slots 5a drilled in the frame body 5 and fixed.

Further, a guide pin 7 is provided on the outer surface of the vertical plate portion 6a of the fixed frame 6.
are vertically arranged at regular intervals, and the other end of the guide pin 7 is fixed to the frame 5.

Two guide holes 8a correspond to this guide pin 7.7.
, 8a are formed in the guide hole g.
It is slidably provided by the guide pins 7.7 fitted into the holes a and ga.

A magnet 9 is held inside the magnet holder 8 with its north and south poles oriented upward and downward.

Further, on the fixed frame 6 side of the magnet holder 8, a female screw portion 10a is provided.
A sliding pin 10 with a hollow part formed at the tip thereof is installed upright, and the sliding pin 10 is slidably inserted into a pin hole 6C bored in the fixed frame 6, and the sliding frame is attached to the tip of the sliding pin 10. 11 is the city screw 1
It is screwed on by 2.

The tips of the horizontal plate parts 11 a, 11 a of this sliding frame 11 are inserted into slots 6 d, 6 d bored in the fixed frame 6,
It is provided so that it can freely slide in the horizontal direction.

A spring 13 is attached to the outer periphery of the sliding pin 10 between the sliding frame 11 and the fixed frame 6 so as to bias the sliding frame 11 outward.

When the magnet holder 8 is in abutment with the fixed frame 6, that is, when the deadbolt 14 is not engaged with the strike at all, there is an alarm on one side close to the magnet 9, which is closed by the magnet 9. A circuit reed switch 15 is provided.

With the above configuration, door deadbolt strike 2
is configured.

On the other hand, a fixed frame 16 is provided on the lower opening side of the frame 5.

Projections 16b are protruded from both sides of the vertical plate portion 16a of the fixed frame 16, and the projections 16b are fitted into slots 5a drilled in the frame body 5 and fixed.

Further, guide pins 17 are provided vertically at regular intervals on the outer surface of the vertical plate portion 16 a of the fixed frame 16 , and the other end of the guide pin 17 is fixed to the frame body 5 .

A magnet holder 8 is slidably provided by guide pins 17, 17 fitted into its guide holes.

This magnet holder 8 has a magnet 9 held inside thereof with its N pole and S pole oriented vertically, as described above.

A shielding frame 18 is provided on the outside of the magnet holder 8 so as to surround the magnet holder 8 and to be slidable on the guide pins 17, 17 through two guide holes 18f, 18f.

This shielding frame 18 is a rectangular frame body, and has an opening 18e in a side plate 18a having a width larger than the corresponding width of the magnet 9. When the magnet holder 8 slides, the magnet 9 moves into the opening 18e.
The entire shape appears from the side plate 18a, or the entire shape is shielded by the side plate 18a.

Moreover, the shielding frame 18 shields the magnetic force of the magnet 9.
Made of magnetically non-permeable material.

The leaf spring 19 biases the side plate 18b of the shielding frame 18 laterally, and is provided with one end fixed to the fixed frame 16 and the other end being a free end.

Due to the bias of the leaf spring 19, the shielding frame 18 does not slide immediately even when the magnet holder 8 slides, but only after the magnet holder 8 collides with the end plate 18C1 or 18d. Moderation has been put in place to encourage people to move.

The magnet holder 8 has a sliding pin 10 erected on the fixed frame 16 side thereof, with a female thread 10a formed in the hollow portion at the tip, as described above, and the sliding pin 10 is bored into the fixed frame 16. It is slidably inserted into the provided screw hole 16C, and the sliding frame 11 is screwed onto the tip of the screw hole 16C with a set screw 12.

The sliding frame 11 is provided so that the distal ends of the horizontal plate portions 11 a, 11 a are inserted into slots 16 d, 16 d bored in the fixed frame 16, so that the sliding frame 11 can freely slide in the horizontal direction.

A sliding pin 10 between this sliding frame 11 and the fixed frame 16
A spring 13 is attached to the outer periphery of the sliding frame 11 so as to bias the sliding frame 11.

When the magnet holder 8 is in the middle of the sliding stroke in the horizontal direction, that is, when the latch bolt 20 protrudes by about half, the magnet 9 is placed on the side of the opening 18 e of the shielding frame 18. Reed switches 15 of the chime circuit, which are activated by the approach of the magnet 9, are provided at suitable intervals within the range in which the magnet 9 acts.

A mounting pin 21 having a screw threaded in a hollow portion at the tip is erected on the inner side surface of the frame 5.

A screw hole is bored corresponding to the mounting pin 21, a slot is bored corresponding to the projections 6b, 16b of the fixed frames 6, 16, and a shape corresponding to the frame 5 is formed. A formed cover 22 is attached to the open side of the frame 5 by set screws 23.

The above structure constitutes the door latch bolt strike 3.

Next, an example of operation will be explained.

First, when the lock (not shown) is locked, the threaded bolt 1
4 presses the sliding frame 11 and projects into the deadbolt strike 2.

As a result, the magnet holder 8 fixed to the sliding frame 11 via the sliding pin 10 is slid to the inner part of the frame 5 together with the magnet 9, and the sliding ends when the deadbolt 14 finishes protruding. do.

In this state, the main switch of the alarm circuit (not shown) is turned on. Then, if the lock is illegally opened from outside, the deadbolt 14 will retreat from the deadbolt strike 2.
As a result, the sliding frame 11 that had been pressed by the deadbolt 14 is moved together with the sliding pin 10, the magnet holder 8, and the magnet 9 by the elastic force of the spring 13, and the frame body 5
It is then slid towards the opening and restored to its original state.

At this time, when the magnet 9 approaches the reed switch 15, the reed switch 15 is activated by the magnetic force of the magnet 9, the alarm circuit is closed, and an alarm is sounded to notify of illegal entry.

This makes it possible to easily and reliably prevent illegal entry.

Next, the operation of the latch bolt will be explained. When the door is closed, the latch bolt 20 presses the sliding frame 11 and projects into the latch bolt strike 3.

As a result, the magnet holder 8 fixed to the sliding frame 11 via the sliding pin 1o is slid to the inner part of the frame 5 together with the magnet 9, and the sliding ends when the latch pole 20 finishes protruding. do.

At this time, since the shielding frame 18 is not fixed to the magnet holder 8 and is biased laterally by the leaf spring 19,
When the magnet holder 8 starts sliding, it does not immediately start sliding, but starts sliding only when the magnet holder 8 collides with the end plate 18C of the shielding frame 18 against the urging force of the leaf spring 19.

Therefore, initially, the magnet holder 8 moves relative to the shielding frame 18 in the state shown in FIG.
Even if the reed switch 15 approaches the reed switch 15, it is blocked by the shielding frame 18, so the reed switch 15 does not operate when the door is closed (see Figure 3).

Next, turn the handle to open the door, and the latch bolt 2
0 retreats from the latch bolt strike 3, and as a result, the sliding frame 11 that had been pressed by the latch bolt 20 is moved away from the sliding pin 1o, the magnet holder 8, and the magnet 9.
At the same time, due to the elastic force of the spring 13, it is slid toward the opening of the frame body 5 and restored to its original state.

At this time, the shielding frame 18 does not immediately slide when the magnet holder 8 starts sliding, as described above, and when the magnet holder 8 collides with the end plate 18d of the shielding frame 18, the leaf spring 19 is biased. It starts sliding only when it resists.

Therefore, similarly to the above, initially the magnet holder 8 is attached to the shielding frame 18.
When the magnet 9 moves away from the side plate 18a and the entire shape appears from the opening 18e, and when the magnet 9 approaches the reed switch 15, the reed switch 15 is activated by the magnetic force of the magnet 9. The chime circuit is closed and the chime is sounded to notify the presence of a visitor (see Figure 3).

Furthermore, when the magnet 9 retreats, the end plate 18d of the shielding frame 18
The magnet 9, together with the shielding frame 18, retreats to the opening of the frame 5 and returns to its original state.

Then, the magnet 9 separates from the reed switch 15 and is shielded from the reed switch 15 by the shielding frame, so the reed switch 15 stops operating, opens the chime circuit, and stops the chime.

With this, it is possible to easily and reliably know through the chime that there is a visitor.

This is particularly effective in that the chime only sounds when the door is opened and it stops after a short period of time.

In addition, in both the dead bolt strike 2 and latch bolt strike 3, the reed switch 15 is used as the switch, so there is no contact like a limit switch, so operation is reliable and durability is improved. effective.

As a result of the above-described configuration, the present invention allows the chime to sound for a certain period of time due to the retraction of the latch bolt when a visitor opens the door, thereby easily and reliably informing the occupants of the presence of a visitor. It has the effect of

The effect is particularly remarkable in that the chime only sounds when the door is opened, and the chime stops after a short period of time.

In addition, we adopted a reed switch as the switch, so
This has the effect of ensuring reliable operation and improving durability.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIG. 1 is a partially cutaway perspective view, FIG. 2 is a side view with the cover 22 removed, and FIG. be. 1...Door strike, 2...Door deadbolt strike, 3...Door latch bolt strike, 9...Magnet, 15.
... Reed switch, 18 ... Shielding frame.

Claims (1)

[Scope of utility model registration request] A magnet is biased outwardly by a spring against the frame body and moved inwardly against the spring by a latch bolt, a reed switch of a chime circuit that is opened and closed by the magnet, and a chime circuit reed switch that is A movable magnet is provided, and a shielding frame is provided that is moved by the magnet and has an opening on the side facing the reed switch, and when the latch bolt advances, the shielding frame that is in the shielding position after the magnet has moved is provided. The shielding frame is moved, and when the latch bolt is retracted, the magnet is moved to actuate the reed switch through the opening, and then the shielding frame in the non-shielding position is moved. Strike for door latch bolts.