JP5850563B2 - Indoor latch lock - Google Patents

Description

  The present invention relates to an indoor lock that locks and locks a latch bolt that is moved forward and backward mainly by a lever.

For example, as can be seen in Patent Document 1, a lock that locks and locks a latch bolt that is advanced and retracted by a knob or a lever with a thumb turn or the like is frequently used for an indoor lock.
However, since the lever has a larger rotational torque than the knob, operating the lever in the locked state exerts a large force on the lock mechanism, and the lock mechanism must be structurally reduced in size. There is a problem with its durability.

JP-A-8-232526

  The present invention has been made in view of such problems, and an object of the present invention is to provide a latch lock in which a large force does not act on the locking mechanism even when a lever is operated during locking.

  The present invention relates to a hollow rectangular core that is rotated by a lever, engages with the rectangular core, moves linearly in the axial direction of the rectangular core, and is always engaged with a latch bolt by an urging member. A cam for retracting the latch bolt, a pivot member inserted into the square core rod, a locking member at one end, a connecting plate with a display panel attached at the other end, and a pivoting and axial direction that can be rotated by the locking member A locking rotation cam that does not move, a concave cam surface forming member that is fixed to the end of the square core so as to face the locking rotation cam, and the locking rotation cam and the concave cam surface forming member And a cam surface for converting the rotation of the rotation cam for locking formed on each of the opposed surfaces to the movement in the axial direction.

  Even if the lever is operated at the time of locking, there is no mechanism for locking the rotation of the lever, so that the lock mechanism is not damaged.

FIGS. 1A to 1C are diagrams showing an embodiment of the present invention. Sectional drawing which shows one Example of this invention. FIGS. 4A and 4B are explanatory diagrams showing the relationship between the latch bolt and the cam. FIGS. 4A to 4C are explanatory views showing the relationship between the locking rotation cam and the concave cam surface forming member. Figures (a) to (c) are diagrams showing other embodiments of the present invention. Sectional drawing which shows the other Example of this invention. FIGS. 4A and 4B are explanatory views showing the relationship between the latch bolt and the cam, respectively.

1A and 1B show an embodiment of the present invention, which is configured as an imposition lock in which a lock main body 1 is fixed to one surface of a door 2.
A hollow square core bar 4 having a square cross section for moving the latch bolt 3 forward and backward is connected to the front and back handles 5 and 6 of the door. A seat 7 that rotatably supports the front handle 5 accommodates a spring 8 that elastically holds the handle in a fixed position.

  A window 5a is provided at the front end of the center portion of the handle 5 on the front side, and a display panel 9 for displaying unlocking and locking is provided here. The display board 9 is engaged with the tip of a connecting plate 11 that penetrates the square core rod 4 so as to be rotatable and is rotated by a thumb turn 10 on the back surface side.

  As shown in FIG. 1C, the latch bolt 3 is provided with a cam groove 3a, and the cam groove 3a engages and disengages with a driving cam 12 rotated by a square core rod 4, The drive cam 12 moves forward and backward with respect to the seat 13.

  As shown in FIG. 1D, the driving cam 12 is formed with a recess 12a, and one end of the square core rod 4 is fixed thereto, and then a concave cam surface forming member 14 is fixed. The concave cam surface forming member 14 has a through hole for freely rotating the connecting plate 11 and acts on a locking rotating cam 15 rotated by the connecting plate 11 engaged with the thumb turn 10. The locking turning cam 15 is connected to the connecting plate 11 by a through hole 15b having a rectangular cross section through which the connecting plate 11 can pass and following the turning of the connecting plate 11.

  The locking cam 15 is engaged with the concave cam surface 14 a of the concave cam surface forming member 14, and the driving cam 12 is connected to the latch bolt 3 by rotating the concave cam surface forming member 14 against the spring 16. The convex cam surface 15a that presses to the position where the engagement is released and the opposing surfaces of the locking cam 15 and the concave cam surface forming member 14 are formed with flat portions 15c and 14b that hold the pressed state. Yes.

  In this embodiment, when the door 2 is closed and the latch bolt 3 enters the seat 13 and the thumb turn 10 is rotated to lock, the locking rotation cam 15 rotates via the connecting plate 11. To do. As a result, the concave cam surface 14 a of the concave cam surface forming member 14 is pushed by the cam surface 15 a of the locking rotation cam 15, and the driving cam 12 separates from the cam groove 3 a of the latch bolt 3 against the spring 16 ( FIG. 1C (b), FIG. 1D (b) (c) arrow A). Note that the locking, that is, the rotation of the thumb turn 10 is transmitted to the display board 9 via the connecting plate 11 to indicate that it is locked.

  When the lever 5 is operated in this state, the lever 5 rotates the square core rod 4, but the drive cam 12 is detached from the cam groove 3a of the latch bolt 3 and is disengaged. The bolt 3 still maintains the engaged state with the seat 13, that is, maintains the locked state.

  In this state, even if the lever 5 is operated with an excessive force to be unlocked, the lever 5 is prevented from rotating by a stopper such as a case, so that it can receive a larger force than the lock mechanism of the conventional indoor lock. It becomes possible.

When the thumb turn 10 is rotated so as to be unlocked, the locking rotation cam 15 is rotated via the connecting plate 11. As a result, the flat portion 14b of the concave cam surface forming member 14 is disengaged from 15c of the locking rotary cam 15, and the concave cam surface 14a of the concave cam surface forming member 14 moves over the cam surface of the locking rotary cam 15 of the sliding spring 16. The drive cam 12 enters the cam groove 3a of the latch bolt 3 by moving in the direction of arrow B in FIG. 1D (c) by the urging force ((a) in FIG. 1C). Thus, when the lever 5 is rotated, the drive cam 12 moves the latch bolt 3 backward from the seat 13 via the square core rod 4.
Note that the locking, that is, the rotation of the thumb turn 10 is transmitted to the display panel 9 via the connecting plate 11 to indicate that the lock is unlocked.

Although the above-mentioned embodiment has been described by taking an example of an imposition lock, it is obvious that it can be applied as a locking structure of a cylindrical lock in which a lock body is buried in a door.
That is, FIG. 2A shows an embodiment of a cylindrical lock, in which the lock body 20 is embedded in the door 2, and the latch bolt 24 is retracted from the seat 25 via the square core rod 23 by the levers 21 and 22. Further, similarly to the above-described embodiment, the rotation of the thumbturn 26 can be transmitted by the connecting plate 27 to be locked and unlocked, and the state is displayed on the window 28 by the display panel 29.

As shown in FIGS. 2B and 2C, the locking mechanism rotates the locking rotary cam 30 by the connecting plate 27 connected to the thumb turn 26 as in the above-described embodiment, thereby moving the concave cam surface forming member 31 forward and backward. It is configured as follows.
As a result, the distance between the engagement shaft 32 engaged with the engagement hole 24a of the latch bolt 24 and the cam 33 is moved in the direction of arrow A in FIG. Keep away from and close when unlocking.
In the figure, reference numerals 30a and 31a denote a rotation cam 30 for locking and a concave cam surface forming member 31, respectively.
The cam surface and concave cam surface which were formed in are shown.

  DESCRIPTION OF SYMBOLS 1 Lock main body 3 Latch bolt 4 Hollow square core rod 9 Display board 10 Thumb turn 11 Connecting plate 14 Concave cam surface forming member 14a Concave cam surface 15 Locking rotation cam 15a Convex cam surface

Claims (1)

A hollow square core that is rotated by a lever, engages with the square core, moves linearly in the axial direction of the square core, and always engages with a latch bolt by an urging member so as to be separated from the latch. A cam for reversing the bolt, a pivot member inserted into the square core rod, a locking member at one end, a connecting plate to which a display panel is attached at the other end, and a locking member that can be rotated by the locking member and does not move in the axial direction Rotating cam, a concave cam surface forming member fixed to an end of the square rod so as to face the locking rotating cam, and an opposing surface of the locking rotating cam and the concave cam surface forming member The indoor latch lock comprising a cam surface that converts the rotation of the locking rotation cam formed on each of the rotation cams into the movement in the axial direction.

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