JPH10220636A - Valve lock device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify structure as the whole device and facilitate locking- unlocking operation by constituting the valve lock device in such a way that an unlock cutout of each tumbler occupies a position of being adjusted opposedly to a fitting insert part of a locking member to release constraint of the locking member at the time of unlocking with key cards inserted in key holes. SOLUTION: In case of opening valves provided every liquid tank of a tank lorry, two key cards, duplicate keys, are inserted in key holes 43, 44 in the direction of arrow marks P so as to oscillate two tumbler groups 5a, 5b from a lock position to an unlock position against a tumbler spring 53 or the like. Unlock cutouts 52 of all tumblers 5 are thereby adjusted opposed to a fitting insert part 67 of a locking member 6, and then an operating part piece is gripped to displace the locking member 6, released from constraint, frontward. Then engagement between the locking member 6 and a locking plate 2 is released, so that a rotatory-operating shaft 12 becomes free to rotate, and the operating shaft 12 is turned by a handle 13 to open a valve. In this lock device, the valve cannot be opened/closed unless using two key cards.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a valve locking device. When different types of liquids are contained in a plurality of liquid tanks in a tank lorry, erroneous operation of a valve provided for each liquid tank may cause an accident of mixing different kinds of liquids, which is dangerous.

[0002] A valve lock device according to the present invention is suitable for separately adopting a plurality of liquid tank valves arranged side by side like a tank truck.

[0003]

2. Description of the Related Art As a conventional valve lock device of this type, there is, for example, one disclosed in Japanese Utility Model Publication No. 5-16144. The lock device, that is, the valve erroneous operation prevention device is configured such that a turret-shaped cover member is engaged and disengaged from a handle portion for opening and closing a valve by a cylinder lock provided on the cover member, so that the valve cannot be opened without a duplicate key.

[0004] However, according to this device, there are problems that the whole structure is complicated and that the operation of attaching and detaching the tower-shaped cover member when opening and closing the valve, that is, the operation of locking and unlocking is extremely troublesome. is there.

[0005]

SUMMARY OF THE INVENTION A valve-shaped device according to the present invention has been proposed for the purpose of solving the above-mentioned problems. That is, it has been proposed for the purpose of simplifying the structure of the entire device and making the locking and unlocking operation extremely easy.

[0006]

SUMMARY OF THE INVENTION In order to achieve the above object, a valve locking device according to the present invention has a gear-shaped locking plate fixed to a rotary operating shaft for opening and closing a valve; a key for a key card. Securing a lock box having a hole in the vicinity of the valve; pivotally pivoting at least one tumbler in the lock box at a position facing the keyhole; and a key card for rocking the tumbler. Each tumbler is provided with an unlocking notch at the rear end side, and is normally biased so that the unlocking notch occupies the locking position; A locking member guided between the tumbler and the tumbler is provided so as to be linearly displaceable therebetween; the locking member has an operation piece exposed outside the lock box; In the unlocking notch of each tumbler at the front end in the The locking plate is provided with an engaging portion for selectively engaging the tooth portion of the locking plate at the rear end side; and the locking member is normally connected to the locking plate by each tumbler. When the key card is inserted into the keyhole and unlocked, the unlocking notch of each tumbler occupies the position where it is opposed to the insertion portion of the locking member and is locked. The condition is that the constraint can be released.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to embodiments shown in the drawings. 1 and 2, reference numeral 10 denotes one liquid tank of a tank lorry, 20 denotes a mounting part of a cylindrical valve in the liquid tank 10, 1 denotes the entire valve, and 11 denotes a bearing part which is a part of a valve body. , 12 denotes a rotary operating shaft for opening and closing a valve body (not shown), 13 denotes a handle fixed to the rotary operating shaft 12, and 91 denotes a valve mounting portion 20.
And a bolt for fixing the flange of the bearing portion 11 of the valve body.

The illustrated valve 1 is of a manual type in which a rotary operating shaft 12 is operated by a handle 13. The rotary operating shaft 12 is rotated by a motor or other driving device. Is also good.

In the present invention, the rotary operating shaft 12
The gear-shaped locking plate 2 is fixed via an appropriate mounting member 14. The locking plate 2 has its teeth 21 selectively engaged with a locking member 6 described later, and is one of the main members of the present invention.

On the other hand, an arbitrary fixing member near the valve 1 includes:
A rectangular key card 3 serving as a plate-like key (see FIGS. 3 and 4)
The lock box 4 having at least one key hole 43 opened is fixed.

The lock box 4 in the illustrated example is formed hollow by a base frame portion 41 and a lid portion 42 having two key holes 43, and the mounting portion 20 of the liquid tank 10 and the valve body are formed via a mounting base 44. Fixed to part 11.

In the figure, reference numeral 47 denotes a key card guide groove formed on the inner surface of each side wall of the lock box 4 and a reference numeral 92 denotes a guide groove for the key card formed on the inner surface of both side walls of the lock box 4. Reference numeral 93 denotes a mounting screw for fixing the mounting base 44 to the mounting portion 20 of the liquid tank 10 and a tightening band for fixing the mounting base 44 to the part 11 of the valve body.

At least one tumbler 5 in the form of a plate is pivotally supported by a horizontal pivot 57 at a position facing each keyhole 43 in the lock box 4.

In the illustrated example, an upper group 5a and a lower group 5b are provided as a tumbler group.
a or 5b is actuated by the key card 3 which is a corresponding duplicate key inserted as shown by an arrow P from the upper keyhole 43 or the lower keyhole 43.

When the number of tumbler groups 5 is only one, it is needless to say that only one key hole 43 needs to be provided, and only one corresponding key card 3 needs to be prepared.

Although the number of tumblers 5 in each tumbler group can be set arbitrarily, in the illustrated lock device, the total number of tumblers in the upper and lower groups is the width of the lock box 4 as clearly shown in FIG. In the embodiment, the number of tumblers 5 in the upper and lower groups is set to three, and three tumblers indicated by a chain line located at the center are used. It is shown as not (mounted).

The tumbler 5 in the illustrated example has a fan-shaped side surface, has a mountain-like acting projection 51 on the front end side, and has an unlocking notch 52 on the rear end side.

Each tumbler 5 has a key card 3
The tumbler spring 53, the weight of the tumbler 5 or a biasing means such as a magnet is urged so that the unlocking notch 52 occupies the locking position in a normal state where the tumbler 5 is not inserted.

A torsion spring 53 is used as an urging means of the tumbler 5 in the illustrated example. Torsion spring 53
A common loop in which a central loop is inserted around a cylindrical spacer 56 fitted on a pivot 57, and one end is fixed to a spring hook piece 54 projecting from each tumbler 5, and the other end is fixed to the lock box 4. Is provided for each tumbler 5 by engaging with the spring hook bar 55. However, in FIG. 2, the torsion spring 53 is not shown.

The spacer 56 is for holding the tumbler 5 at a predetermined position in the longitudinal direction of the pivot 57. The spring hook 55 also serves as a stopper in a normal state of each tumbler 5.

Further, a lock member 6 is provided between the above-mentioned locking plate 2 and the tumbler 5 in the lock box 4 so as to be linearly displaceable therebetween.

The locking member 6 in the illustrated example is formed in a frame by upper and lower plates 61 and 62 and both side plates 63 and 64, both of which have a convex surface, and one side plate 63 is extended forward. Then, it is exposed to the outside through the side opening 45 of the lock box 4, thereby forming the operation portion piece 65. Reference numeral 66 denotes a knob fixed to the tip of the operation section piece 65.

Then, in the locking member 6 forming the frame,
The front end of the lower plate 62 in the displacement direction forms a fitting portion 67. When the tumbler group 5 is swung by the insertion of the key card 3 which is a duplicate key, and the unlock notches 52 are aligned,
It is intended to be fitted there.

A tube or the like, for example, is fixed between the upper and lower plates 61, 62 on the rear end side of the locking member 6, and an engaging portion 68 is formed. The engaging portion 68 is projected outward from the rear opening 46 of the lock box 4, and the locking portion 2 of the locking plate 2 is normally locked at the time of locking, which is the normal state of the valve locking device according to the present invention.
1 is selectively engaged.

In short, the locking member 6 is normally restrained by each tumbler 5 at a position where it engages with the locking plate 2, and when the predetermined key card 3 is inserted into the keyhole 43, each locking member 6 is unlocked. Of the lock member 6 occupies a position where the lock notch 52 faces the insertion portion 67 of the lock member 6 so that the lock member 6 can be restrained. The engaging portion 68 of the locking member 6
Can be a roller.

FIGS. 3 and 4 show a key card 3 used in the valve lock device of the present invention. The operation hole 31 of the key card 3 is inserted into the key hole 4 of the lock box 4.
When the tumbler 5 is inserted into the key card 3, the tumbler 5 fitted with the front end operation projection 51 is pivotally displaced from the locking position to the unlocking position. The key card 3 may be formed at an intermediate portion (in the insertion direction) or a notch (not shown) formed at a front end portion in the length direction of the key card 3.

In the four examples of key cards 3 shown in FIGS. 3A to 3D, the operation holes 31 are provided symmetrically with respect to the center line in the width direction. Needless to say, the operation hole (31) may be provided asymmetrically with respect to the center line in the width direction of the key card (3).

As shown, two tumbler groups 5a,
The lock device provided with 5b and two key holes 43, 43 is unlocked only when the key cards 3, 3 as two duplicate keys are used. In such a case, the key cards 3 and 3 are preferably managed by different persons.

For example, in the case of using a lock device for a valve in a liquid tank of a tank lorry, one key card 3 is stored in a vehicle by a driver of the tank lorry.
If the other key card 3 is stored by a person in charge of the gas station in the station, the opening and closing operation of the valve is checked by two persons, which is extremely effective in preventing erroneous operation of the valve. is there.

An example of the operation of the valve locking device of the present invention will be described with reference to FIGS. 1, 2 and 5.

FIG. 1, FIG. 2 and FIG. 5 (A) show a locked state, in which the tooth portion 21 of the locking plate 2 fixed to the rotary operating shaft 12 is locked. The engaging portion 68 of the member 6 is engaged, and is in front of the locking member 6 (FIG. 1).
2 is restrained at the rear end of the tumbler 5, so that the rotating operation shaft 12 cannot be rotated by the handle 13 or the like. At this time, the valve is closed.

Here, in order to open the valve, the two key cards 3, 3, which are two duplicate keys, are inserted into the respective key holes 43, 43 as shown by the arrow P, and the two tumbler groups 5 are inserted.
a, 5b are swung from the locked position to the unlocked position against the urging force of the tumbler spring 53 and the like, and the unlocking notches 52 of all the tumblers 5 face the insertion portions 67 of the locking members 6. After the alignment, the operating member 65 is grasped with fingers to displace the unlocked locking member 6 forward as indicated by the arrow Q (see FIG. 5C).

Here, since the engagement between the locking member 6 and the locking plate 2 is released, the rotation of the rotation operating shaft 12 becomes free,
The valve is opened by turning the operating shaft 12 right or left with the handle 13 or the driving device.

FIG. 5B shows a state in which only one key card 43 is inserted. In this state, the upper tumbler group 5a is in the unlocking position, but the lower tumbler group 5b continues to be locked. Occupy position.

Therefore, the locking member 6 is continuously restrained by the lower tumbler group 5b at the engagement position with the gear-shaped locking plate 2, and the rotation of the valve operating shaft 12 is impossible. . That is, in the illustrated lock device, the valve cannot be opened or closed unless the two key cards 3 are used.

Each tumbler 5 using the key card 3
Swinging to the locked position may be performed by fitting the operation protrusion 51 on the front end side of the tumbler 5 into the operation hole 31 of the key card 3, or by moving the operation protrusion 51 on one surface of the key card 3. May be done.

In short, in the lock device and the key card in the illustrated example, the key card 3
The two key differences occur depending on the presence / absence of the action hole 31 at the corresponding position.

Next, the operation of returning from the above-described open state of the valve in FIG. 5C to a normal state in which the valve is closed and locked will be described.

In this state, since the rotary operating shaft 12 is rotatable, the coaxial 12 is rotated in the opposite direction to the above to close the valve.

Here, the operating member 65 of the locking member 6 is displaced by a finger toward the rear in the direction opposite to the arrow Q to engage the locking member 6 and the locking plate 2, and then the two The key cards 3, 3 are removed from the key holes 43, 43.

Then, as shown in FIG. 1, FIG. 2 and FIG. 5A, each tumbler 5 automatically returns to the locked position by the urging force of the tumbler spring 53 and the like, and each tumbler 5 is locked at the rear end. Since the stop member 6 is restrained in the engagement state with the locking plate 2, the valve returns to the locked state.

When the tumbler group (5) is made into one group so that it can be operated only by one kind of key card (3), the locking and unlocking operation of the valve locking device is as described above. Since it is similar to that of the lock device having the tumbler groups 5a and 5b, the description thereof is omitted here.

If a spring (not shown) for urging the locking member 6 forward, for example, is provided between the locking member 6 and the lock box 4, even if the operation piece 65 is not used, Since automatic unlocking is possible, it is more advantageous for improvement in operability.

[0044]

According to the valve locking device of the present invention described above, the structure of the entire device is extremely simple irrespective of whether the rotary operating shaft for opening and closing the valve is locked and immobilized in the normal state. In addition, the locking and unlocking operation can be performed extremely easily.

[Brief description of the drawings]

FIG. 1 is a partial longitudinal sectional side view showing an embodiment of a valve lock device of the present invention.

FIG. 2 is a cross-sectional plan view thereof. However, the tumbler spring is omitted in this figure.

3A to 3D are plan views of different key cards used for the lock device of FIG. 1, and show four arrangement examples of action holes.

FIG. 4 is a common side view of the key card of FIG. 3;

FIGS. 5A and 5B are longitudinal cross-sectional explanatory views showing the operation of the lock device shown in FIGS. 1 and 2, wherein FIG. 5A shows a state before two key cards are inserted, and FIG. (C) shows a state in which the two cards are inserted together.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Valve 2 Locking plate 21 Tooth part 3 Key card 31 Working hole 4 Lock box 43 Key hole 5 Tumbler 52 Unlocking notch 6 Locking member 65 Operating piece 67 Fitting part 68 Engaging part

Claims (1)

[Claims] 1. A gear-shaped locking plate is fixed to a rotary operating shaft for opening and closing a valve; a lock box having a key hole for a key card is fixed near the valve; a key in the lock box At least one tumbler is pivotally pivoted in the position facing the holes; the key card is provided with a working hole for rocking the tumblers; each tumbler has an unlocking notch at its rear end. The unlocking notch is normally urged to occupy the locking position; a locking box is provided between the locking plate and the tumbler in the locking box so as to be linearly displaceable therebetween. The locking member has an operating part exposed outside the lock box; the locking member is selectively inserted into the unlocking notch of each tumbler at the front end side in the displacement direction. And the teeth of the locking plate are selectively engaged with the rear end side. And a locking member is normally restrained at a position where the locking member is engaged with the locking plate by each tumbler, and each tumbler is unlocked when the key card is inserted into the keyhole. The lock device for a valve, wherein the unlocking notch occupies a position where the unlocking notch is opposed to and fitted to the insertion portion of the locking member so that the locking member can be released.