JP3432170B2 - Locking device - Google Patents

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a locking device.

[0002]

2. Description of the Related Art A locking device disclosed in Japanese Utility Model Laid-Open No. 6-67741 is composed of a locking member attached to a door and a handle which can be inserted into and removed from the locking member for operating the locking member. The locking member is formed by a fixed cylinder fixed to the door and a movable cylinder rotatably mounted inside the fixed cylinder. In the movable cylinder, a claw metal fitting can be attached to the rear end exposed to the inside of the door, and a handle insertion port that allows insertion and removal of the handle in the direction parallel to the front of the door at the front end exposed to the outside of the door, A handle insertion path that extends inward in the radial direction of the movable cylinder from the handle insertion port is formed. The fixed cylinder and the movable cylinder can be engaged and disengaged from each other by a lock mechanism interposed therebetween.

The locking mechanism of the locking member is released when the handle is inserted into the handle insertion path. When the inserted handle is turned, the movable cylinder turns in both forward and reverse directions,
Locking and unlocking operations can be performed.

[0004]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In some cases, a second locking device is attached separately from the first locking device in order to make it difficult to unlock the door. The second locking device is composed of a locking member attached to the door and a key that can be inserted into and removed from the locking member for operating the locking member. The locking member is formed by a fixed cylinder fixed to the door, a movable cylinder rotatably mounted inside the fixed cylinder, and a latch capable of advancing and retracting from the outer peripheral surface of the fixed cylinder by the rotation of the movable cylinder. The fixed cylinder and the movable cylinder can be engaged and disengaged from each other by a lock mechanism. When the key is inserted into the key insertion portion, the fixed cylinder and the movable cylinder are disengaged, and the movable cylinder can be rotated. The movable cylinder of the first locking device has a mortise hole through which the latch of the second locking device can enter and retract, and when the latch enters the mortise hole, rotation of the movable cylinder of the first locking device is blocked. To be done.

In the case where the second locking device is provided, the second locking device has to be separately attached to the door, which is troublesome and the size of the device becomes large.

An object of the present invention is to provide a compact locking device which is difficult to unlock.

[0007]

In order to solve the above-mentioned problems, the present invention is based on a locking member attached to a door and a handle for locking and unlocking the locking member. The locking member has a fixed cylinder fixed to the door and a first cylinder rotatably mounted inside the fixed cylinder, and the first cylinder is located inside the door. Handle having a rear end portion to which a claw fitting can be attached and a front end portion located outside the door, and the handle can be inserted into and removed from the front end portion of the first cylinder in parallel with the front surface of the door. An insertion opening and a handle insertion path extending inward in the first cylinder from the insertion opening are formed. When the handle is inserted into the insertion path, the handle engages with the first cylinder, By turning The first cylinder is rotated to opposite directions, a locking device capable of engaging and disengaging the pawl bracket to the fixed frame in which the door is mounted for opening and closing.

Under such a premise, a feature of the present invention is that a second cylinder coaxial with the first cylinder is rotatably mounted inside the first cylinder, and the second cylinder is The handle has a key insertion portion near the front end of the first cylinder, into which a key that can rotate the second cylinder can be inserted and removed, and is located in the handle insertion path of the first cylinder. An engaging portion that can be engaged with and disengaged from the handle inserted into the insertion path, and the engaging portion is engageable with the handle when the second cylinder rotates and is at a required position; and The handle is formed so as not to engage with the handle when the handle is in a position other than the above position.

As an example of an embodiment of the present invention, the engaging portion of the second cylinder is an elliptical one having a long axis and a short axis, and the handle is rearward from the insertion front end portion. A guide portion extending toward the second cylinder engagement portion, the width of the guide portion being smaller than the dimension of the major axis of the second cylinder engaging portion and greater than the dimension of the minor axis of the second cylinder engaging portion; When the short axis of the cylinder engaging portion intersects the insertion direction of the handle, the cylinder engaging portion can enter the engaging portion.

As another example of the embodiment of the present invention,
The first cylinder and the second cylinder can be engaged and disengaged from each other by a lock mechanism interposed between the cylinders, and when the key is inserted into the key insertion portion, the release means formed on the key is used. The lock mechanism is released, the second cylinder is rotated in both forward and reverse directions by the rotation of the key, and the engaging portion of the second cylinder can be engaged and disengaged with the handle. Turn to and.

As another example of the embodiment of the present invention,
The fixed cylinder and the first cylinder can be engaged and disengaged from each other by a locking mechanism interposed therebetween, and when the handle is inserted into the insertion path, a releasing means formed at an insertion front end portion of the handle. The locking mechanism is released, and the first cylinder becomes rotatable with respect to the fixed cylinder.

[0012]

BEST MODE FOR CARRYING OUT THE INVENTION Details of a locking device according to the present invention will be described below with reference to the accompanying drawings.

FIG. 1 is a perspective view of a locking device which is attached to a side portion of a door 6 that opens and closes so as to penetrate from the outside to the inside of the door 6, and the door 6 and a fixed frame 13 are shown in a cutaway view. There is. The locking device is a locking member 1 attached to a door 6, a handle 7 that can be inserted into and removed from the locking member 1 for locking and unlocking the locking device, and a key 8 that can be inserted into and removed from the locking member 1. It consists of and. In the figure, the handle 7 and the key 8 are in a state of being removed from the locking member 1, the claw fitting 5 of the locking member 1 is engaged with the fixed frame 13 from the inside, and the door 6 closed with respect to the fixed frame 13 is shown. Is locked. Handle 7
When is inserted into the locking member 1 from the direction of the arrow Y in parallel with the outer surface of the door 6 and pivoted in the clockwise direction, the claw fitting 5 also pivots in the clockwise direction and the engagement with the fixed frame 13 is released. 6 is unlocked.

The front end portion 7a of the handle 7 inserted into the locking member 1 has a handle 7 on a surface facing the outer surface of the door 6.
A recessed portion 7b (release means) that is recessed in the thickness direction and a guide recessed portion 7c that extends from the front end of the insertion front end portion 7a in the direction opposite to the insertion direction Y are formed.

FIG. 2 is a sectional view taken along the line AA of FIG. 1 and shows the second cylinder 4 and the washer 11 and the bolt 12 located behind the claw fitting 5 in a state where they are not cut. The locking member 1 includes a fixed cylinder 2 fixed to the door 6, a first cylinder 3 rotatably mounted inside the fixed cylinder 2, a coaxial cylinder with the first cylinder 3, and a fixed cylinder 2 inside the first cylinder 3. The second cylinder 4 is rotatably mounted.

The fixed cylinder 2 has a front end portion 2a located outside the door 6, a rear end portion 2b located inside the door 6, and a hollow portion 2c penetrating between the front and rear end portions 2a and 2b.
At the rear end portion 2b, a protruding portion 2d that restricts the rotation range of the first cylinder 3 is provided from the peripheral surface of the fixed cylinder 2 to the fixed cylinder 2.
Extends axially rearward. The fixed cylinder 2 is attached such that the nut 10 is screwed onto a screw formed on the peripheral surface of the rear end portion 2b of the fixed cylinder 2, and the door 6 is sandwiched by the flange 2e formed on the front end portion 2a and the nut 10. ing.

The first cylinder 3 is mounted in the hollow portion 2c of the fixed cylinder 2 and is located outside the door 6 and is exposed from the fixed cylinder 2 at the front end 3a, and inside the door 6 the fixed cylinder 2 is provided. And a rear end portion 3b exposed from. The fixed cylinder 2 and the first cylinder 3 can be engaged and disengaged from each other by a locking mechanism described below that is interposed between the fixed cylinder 2 and the first cylinder 3.
When the lock mechanism is released, the first cylinder 3 can rotate in both forward and reverse directions with the outer peripheral surface of the first cylinder 3 slidingly contacting the peripheral surface of the hollow portion 2c of the fixed cylinder 2.

At the front end portion 3a of the first cylinder 3, there is formed a through hole 3c extending from the front end to the axial rear side of the first cylinder 3. A handle insertion opening 3d into which the handle 7 can be inserted / removed in parallel with the outer surface of the door 6 on the peripheral surface of the front end portion 3a.
Is formed, and the handle insertion path 3e extends inward in the radial direction of the first cylinder 3 from the insertion opening 3d. In the insertion path 3e, a pin tumbler 32 extending in the axial direction of the first cylinder 3
Part of is exposed.

The rear end portion 3b of the first cylinder 3 has a stopper portion which comes into contact with the protruding portion 2d of the fixed cylinder 2 at the rotation start point and the rotation end point when the first cylinder 3 rotates. With the rotation restricting ring 9 and the claw fitting 5 located behind the ring 9 prevented from rotating in the circumferential direction of the first cylinder 3, the rear end 3b is screwed through the washer 11. It is attached by wearing bolts 12.
At the rear end 3b, between the fixed cylinder 2 and the ring 9,
A C-shaped retaining ring 14 for a shaft is attached to prevent the first cylinder 3 from coming off the fixed cylinder 2.

The second cylinder 4 is mounted in the through hole 3c of the first cylinder 3 and extends axially rearward of the first cylinder 3 from the end exposed at the front end 3a of the first cylinder 3 to lock the key 8. An insertable / uninsertable key insertion portion (not shown) and a handle insertion path 3e of the first cylinder 3, which is engageable with and disengageable from the guide recess 7c of the handle 7 and rotatable with the rotation of the second cylinder 4. The second cylinder 4 has an engaging portion 4a extending radially outward. First cylinder 3 and second cylinder 4
Can be engaged with and disengaged from each other by a known cylinder lock mechanism interposed between the cylinders 3 and 4, and when the lock mechanism is released, the second cylinder 4 has the outer peripheral surface of the second cylinder 4 as the first cylinder. The cylinder 3 can be rotated in both the forward and reverse directions while being in sliding contact with the peripheral surface of the through hole 3c.

FIG. 3 is a sectional view of the locking device in FIG. 1 taken along the line BB, showing a state in which the guide recessed portion 7c of the handle 7 shown by a virtual line is housed in the engaging portion 4a of the second cylinder 4. . The cross section of the engaging portion 4a is an elliptical shape having a long axis L1 and a short axis L2, and the long axis L1 is the width L3 of the guide recess 7c.
And the minor axis L2 is slightly smaller than the width L3 of the guide recess 7c. Therefore, when the short axis L2 of the engagement portion 4a intersects the insertion direction Y of the handle 7, the guide recess 7c can enter the engagement portion 4a, and the handle 7 is inserted into the insertion path 3e.
Can be inserted into. When the short axis L2 of the engaging portion 4a is parallel to the insertion direction Y of the handle 7, the guide recess 7c cannot engage with the engaging portion 4a, and the handle 7 cannot be inserted into the insertion path 3e.

FIG. 4 shows the fixed cylinder 2 and the first cylinder 3.
It is a partially enlarged view of a lock mechanism interposed between and, and is shown in a state where the second cylinder 4 is not cut. In the drawing, the state in which the front end portion 7a of the handle 7 is inserted into the insertion path 3e and the guide recessed portion 7c of the handle 7 has entered the engagement portion 4a of the first cylinder 3 is shown by an imaginary line. Fixed cylinder 2 and first cylinder 3
Holes extending in the axial direction of the first cylinder 3 are formed in and, and a compression spring 30 is loaded in the hole of the fixed cylinder 2. A driver 31 capable of straddling each of the holes of the fixed cylinder 2 and the first cylinder 3 is loaded at the tip of the compression spring 30, and a pin tumbler 32 is loaded in the hole of the first cylinder 3. . When the driver 31 straddles the fixed cylinder 2 and the first cylinder 3, rotation of the first cylinder 3 with respect to the fixed cylinder 2 is blocked.

In the figure, the recess 7b of the handle 7 inserted into the insertion path 3e pushes the pin tumbler 32 axially rearward of the first cylinder 3. The contact surface 33 between the driver 31 and the pin tumbler 32 moves to the sliding contact surface between the fixed cylinder 2 and the first cylinder 3, and the first cylinder 3 is in a rotatable state. In FIG. 1, when the handle 7 is turned clockwise to rotate the first cylinder 3, the claw fitting 5 is disengaged from the fixed frame 13, and the door 6 can be unlocked.

In the handle 7, the pin tumbler 32 is held in the recess 7b of the handle 7 and the hole of the first cylinder 3 between the rotation start point and the rotation end point, and the recess 7b and the hole of the first cylinder 3 are formed. A pin tumbler 32 that straddles the handlebar prevents the handle 7 from being pulled out between the rotation start point and the rotation end point.
When the handle 7 is rotated to the rotation end point, the position of the hole formed in the fixed cylinder 2 and the position of the pin tumbler 32 coincide with each other, and when the handle 7 is tried to be removed, the pin tumbler 32 comes out of the recess 7b. Since 32 can be pushed back axially rearward of the first cylinder 3, the handle 7 can be pulled out from the insertion path 3e.

Although not shown in the drawing, a part of the plate tumbler protruding from the peripheral surface of the second cylinder 4 enters into the hole formed in the first cylinder 3, and the second tumbler for the first cylinder 3 is inserted.
The rotation of the cylinder 4 is blocked. When the key 8 is inserted into the key insertion portion of the second cylinder 4, the key notch (release means)
However, the plate tumbler is pushed back into the inside of the second cylinder against the bias of the compression spring (not shown), and the plate tumbler is removed from the hole of the first cylinder 3. In this state, the engagement between the first cylinder 3 and the second cylinder 4 is released, and the second cylinder 4 becomes rotatable. When the second cylinder 4 is rotated by the key 8, the short axis L2 of the engagement portion 4a can intersect with the insertion direction Y of the handle 7 or can be parallel to it. The second cylinder 4 is regulated to rotate within a range of about 90 °.

The rotation start point and rotation end point of the handle 7 are regulated by the protrusion 2d of the fixed cylinder 2 inside the door 6 and the stopper portion of the rotation regulation ring 9.

In such a locking device, it cannot be unlocked unless the handle 7 suitable for the device is inserted. Also, the handle 7 uses the key 8 for the second cylinder 4
When the short axis L2 of the engaging portion 4a of the above is intersected with the insertion direction Y of the handle 7, it can be inserted, and the long axis L1 is inserted in the insertion direction Y.
It becomes impossible to insert when crossed with.

Since the locking device can be locked double or triple in this way, not only is the safety high, but the second cylinder 4 rotates in the first cylinder 3 to which the claw fitting 5 is attached. Therefore, the mounting area of the locking device with respect to the door 6 does not increase.

The present invention can be carried out by omitting the lock mechanism interposed between the fixed cylinder 2 and the first cylinder 3. The engagement and disengagement of the second cylinder 4 and the handle 7 are not limited to those of the oval engagement portion 4a and the guide recess 7c as shown in the figure, but various modes are possible.
For example, the handle 7 may be attached to the insertion portion 7a of the handle 7.
May be formed with a convex portion extending in the inserting direction, and the cylinder 4 positioned in the insertion path 3e may be formed with a concave portion that is engageable with the convex portion and that is recessed radially inward of the cylinder 4.

[0030]

According to the locking device of the present invention, the locking mechanism interposed between the first cylinder and the second cylinder is released, and the guide portion of the handle can enter the engaging portion of the second cylinder. As described above, since the second cylinder has to be rotated, it is difficult to unlock the lock, as compared with a locking device having only a locking mechanism interposed between the fixed cylinder and the first cylinder. Since the locking device according to the present invention has a structure in which two locking mechanisms are integrated, it is not necessary to attach the two locking devices to the door, which is different from the above-mentioned conventional technique, and the locking device can be made compact.

[Brief description of drawings]

FIG. 1 is a perspective view of a locking device.

FIG. 2 is a sectional view taken along the line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG.

FIG. 4 is a partially enlarged view of a lock mechanism interposed between a fixed cylinder and a first cylinder.

[Explanation of symbols]

1 Locking member 2 Fixed cylinder 3 first cylinder 3a front end 3b rear end 3d handle insertion port 3e Handle insertion path 4 second cylinder 4a engaging part 5 claw metal fittings 6 doors 7 handle 7a insertion front end 7b Recess (release means) 7c Guide recess (guide) 8 keys L1 long axis L2 short axis L3 width

Continuation of front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E05B 3/00 E05B 13/00 E05B 35/12

Claims (4)

(57) [Claims] 1. A fixed cylinder, which comprises a locking member attached to a door and a handle for locking and unlocking the locking member, wherein the locking member is fixed to the door, and the inside of the fixed cylinder. A first cylinder that is rotatably mounted to the first cylinder, the first cylinder being located inside the door, and having a claw fitting attached thereto, and the front end located outside the door. A handle insertion opening through which the handle can be inserted / removed in parallel with the front surface of the door, and a handle insertion path extending inward in the radial direction of the first cylinder from the insertion opening. When the handle is inserted into the insertion path, the handle engages with the first cylinder, and the turning of the handle causes the first cylinder to rotate in both forward and reverse directions, so that the door can be opened and closed. Mounted on In the locking device capable of engaging and disengaging the claw fitting with the fixed frame, a second cylinder coaxial with the first cylinder is rotatably mounted inside the first cylinder, and the second cylinder is A key insertion portion for inserting and removing a key capable of rotating the second cylinder is provided in the vicinity of a front end portion of the first cylinder, and is located in a handle insertion path of the first cylinder, There is an engaging portion that can be engaged with and disengaged from the handle inserted into the handle insertion path, and the engaging portion can engage with the handle when the second cylinder rotates to a desired position. And the device is formed so as not to engage with the handle when the device is not in the position. 2. The engaging portion of the second cylinder is an elliptical shape having a long axis and a short axis, and the handle has:
A guide portion is formed that extends rearward from the insertion front end portion, and the width of the guide portion is smaller than the dimension of the major axis and greater than the dimension of the minor axis of the second cylinder engaging portion, and the guide is provided. 2. The device according to claim 1, wherein the portion can enter the engaging portion when the short axis of the second cylinder engaging portion intersects the insertion direction of the handle. 3. The first cylinder and the second cylinder can be engaged and disengaged from each other by a lock mechanism interposed between the cylinders, and when the key is inserted into the key insertion portion, the key is formed in the key. The lock mechanism is released by the release means, the second cylinder is rotated in both forward and reverse directions by the rotation of the key, and the engaging portion of the second cylinder is brought into a position where it can be engaged with the handle. The device according to claim 1 or 2, wherein the device is pivoted to a non-engageable position. 4. The fixed cylinder and the first cylinder are engageable with and disengageable from each other by a locking mechanism interposed therebetween, and are formed at an insertion front end portion of the handle when the handle is inserted into the insertion path. The device according to any one of claims 1 to 3, wherein the lock mechanism is released by the released means, and the first cylinder is rotatable with respect to the fixed cylinder.