JP2007326615A - Locking device of screw stopper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a locking device of a screw stopper capable of locking by an easy operation in a simple structure. <P>SOLUTION: The screw stopper 15 is screwed into an opening 12 of a tank body to have the opening 12 closed. An engaging protrusion 17 is provided on the screw stopper 15, and a locking hole 18 is provided through the protrusion 17. The top of the screw stopper 15 is provided with a first detent clasp 19 which keeps rotation restricted with respect to the opening 12 of the tank body and a second detent clasp 20 overlapped on the clasp 19 and its rotation restricted with respect to the clasp 19. A first engaging hole 19b of the first clasp 19 is formed to be a circular hole so that the protrusion 17 can rotate, and a second engaging hole 21 of the second clasp 20 is formed to be a cross so that it can engage with the protrusion 17 in the orthogonal direction. By locking the locking hole 18, the closed state by the screw stopper 15 can be kept. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a screw plug locking device for maintaining a closed state by a screw plug in an opening of a tank main body such as an underground tank storage device for storing gasoline, kerosene, heavy oil and the like.

  The fuel tank lid on the fuel tank, etc. is intended to prevent rain and garbage from entering the tank after it has been filled into the tank from the fuel filler port. Oil may be removed by opening the palate or foreign matter may be mixed. In order to prevent such a situation, a locking device may be provided on the fuel filler cap.

  As such a locking device, for example, a locking device for a fuel filler cap in a fuel tank or the like described in Patent Document 1 is known. That is, a cylindrical oil filler nipple is provided on the upper surface of the tank for storing fuel oil, and the oil filler nipple is covered with an oil filler cap that is rotated by a predetermined angle or more and screwed to the oil filler nipple. . A wire rope as a detent fitting is engaged with the periphery of the oil filler lid, and the wire rope and accessories other than the oil filler nipple are engaged and locked with a key. In this case, the wire rope and the key are set to the length of the tension state so that the refueling lid can only allow rotation of a predetermined angle or less. Then, after refueling into the tank from the refueling port, the wire rope and the accessory are locked with a key, and when the refueling port is used again, the key is unlocked and the wire rope is detached from the accessory.

However, since a long wire rope is used as a locking bracket, it is necessary to engage the wire rope with the accessory when locking and lock it with a key. Such work is troublesome because the wire rope needs to be separated. For this reason, the type of locking device which does not use a wire rope as such a detent metal fitting is known. That is, an engagement protrusion is provided on the fuel filler cap, and a locking hole is formed through the engagement protrusion, and both ends of the engagement protrusion are bent to form a U-shape. The engaging protrusion is inserted into the housing. The both end portions of the rotation stopper are rotated along the outer peripheral portion of the fuel tank main body, and contact with the rotation restricting protrusion protruding from the outer peripheral portion of the fuel tank main body so that further rotation is prevented. It has become.
JP 2004-284644 A (pages 2 to 4)

  However, in the above-described conventional locking device, since the oil filler cap is screwed and connected to the oil filler nipple, the position after the screw connection is not constant due to the length of the threaded portion of the male screw and the female screw. For this reason, when the engagement protrusion on the oil filler lid is inserted into the locking hole of the rotation stopper and the rotation stopper is engaged with the fuel filler lid, the end of the rotation stopper is the rotation restriction protrusion of the fuel tank body. In some cases, the anti-rotation metal fitting cannot be engaged with the fuel filler cap. In other words, since the anti-rotation fitting is formed to extend in one direction, there is a problem that the anti-rotation fitting cannot be attached depending on the position after the fuel filler lid is screwed to the fuel tank body. . For this reason, the screwing of the fuel tank lid to the fuel tank main body is slightly loosened, and a packing is interposed between them, and the end of the anti-rotation fitting is cut off, which is troublesome.

  The present invention has been made paying attention to such problems existing in the prior art. An object of the present invention is to provide a screw plug locking device that can be locked by a simple operation with a simple configuration.

  In order to achieve the above object, the locking device for a screw cap according to the first aspect of the present invention is an engagement in which a screw cap is screwed to a main body to close an opening, and is projected on the screw plug. The protrusion has a locking hole, and has an engagement hole through which the engagement protrusion is inserted, and is provided with a detent fitting that is restricted from rotating with respect to the main body while being inserted into the engagement hole. A locking device for locking the locking bracket by locking the locking hole and maintaining a closed state by a screw cap, extending in the direction in which the engagement holes of the locking bracket intersect, both directions It is comprised so that it can engage with an engagement protrusion.

According to a second aspect of the present invention, there is provided the screw cap locking device according to the first aspect, wherein the screw cap is provided in an opening of the tank body.
According to a third aspect of the present invention, there is provided the locking device for the screw cap according to the first or second aspect, wherein the engagement hole of the rotation stopper metal extends in a cross shape and engages with the engagement protrusion in the orthogonal direction. It is comprised so that it can do.

  The locking device for a screw cap according to a fourth aspect of the present invention is the invention according to the first or second aspect, wherein the detent metal fitting is a first detent metal fitting whose rotation is restricted with respect to the main body, And a second anti-rotation fitting that is disposed on top of the first anti-rotation fitting and whose rotation is restricted with respect to the first anti-rotation fitting. The second engagement hole of the second detent fitting extends in the intersecting direction and can be engaged with the engagement protrusion in both directions. is there.

According to the present invention, the following effects can be exhibited.
In the screw stopper locking device according to the first aspect of the present invention, since the engagement hole of the locking member extends in the intersecting direction and can be engaged with the engagement protrusion in both directions, it is in one direction. When the engaging hole extending in the direction cannot be engaged with the engaging protrusion, the engaging hole extending in the other direction can be engaged with the engaging protrusion. Therefore, locking can be performed with a simple configuration and an easy operation.

  In the locking device for the screw cap of the invention according to claim 2, since the screw cap is provided in the opening of the tank body, the effect of the invention according to claim 1 is exerted on the tank containing fuel and the like. be able to.

  In the locking device for the screw cap according to the third aspect of the present invention, the engagement hole of the detent metal fitting extends in a cross shape and can be engaged with the engagement protrusion in the orthogonal direction. However, when it cannot be used in one direction, it can be used easily by turning 90 degrees, and the effect of the invention according to claim 1 can be improved.

  In the locking device for the screw cap of the invention according to claim 4, since the first detent metal fitting and the second detent metal fitting are provided, in addition to the effect of the invention according to claim 1 or 2, The degree of freedom in design can be increased and the appearance can be improved.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments that are considered to be the best of the present invention will be described in detail with reference to the drawings.
(First embodiment)
As shown in FIGS. 1 to 3, an opening 12 of a tank body 11 such as an underground tank storage device for storing gasoline, kerosene, heavy oil or the like is formed in a substantially cylindrical shape, and an internal thread 13 is formed on an inner peripheral surface thereof. And a pair of rotation restricting recesses 14 extending in the vertical direction are provided on the outer peripheral surface at positions opposed to each other by 180 degrees. A male screw 16 of a screw plug 15 is screwed into the female screw 13 so that the opening 12 of the tank body 11 can be closed. A rectangular engagement protrusion 17 is provided on the screw plug 15, and a circular locking hole 18 is formed through the engagement protrusion 17.

  The rotation restricting recess 14 is engaged with a pair of rotation restricting legs 19 a formed by bending at a position opposed to the first detent metal 19 at 180 degrees, and the first detent metal 19 for the tank body 11 is engaged. Is restricted. The first detent metal fitting 19 is movable in the vertical direction. A state in which a circular hole 19b as a first engagement hole is formed at the center of the first detent metal fitting 19 and the outer periphery thereof is formed in a circular shape, and the engagement protrusion 17 on the screw plug 15 is inserted. Thus, the screw cap 15 can be freely rotated. On the first detent metal fitting 19, a second detent metal fitting is disposed so as to overlap.

  The second anti-rotation metal fitting 20 is formed in a substantially disc shape, and a locking leg portion 20a is formed by bending both end portions downward at a position opposed to 180 degrees. The locking leg 20 a is positioned inside the rotation restricting leg 19 a of the first rotation stopper 19 and can be rotated along the outer periphery of the first rotation stopper 19. When the second anti-rotation bracket 20 is rotated by a certain angle (see the two-dot chain line in FIG. 3A), the locking leg 20a abuts against the first anti-rotation bracket 19 and is prevented from rotating. It is configured. The second detent metal fitting 20 is movable in the vertical direction. An engagement hole 21 as a second engagement hole extending in a cross shape is provided at the center of the second rotation stopper 20, and is configured to be able to engage with the engagement protrusion 17 of the screw plug 15 in the orthogonal direction. . The engagement hole 21 includes an engagement hole 21a extending in one direction and an engagement hole 21b extending in a direction orthogonal to the engagement hole 21a.

  As shown in FIG. 2, after the first detent metal fitting 19 is placed on the second detent metal fitting 20, the key 22 is inserted into the locking hole 18 formed in the engagement protrusion 17 of the screw plug 15. Then, it is locked and locking by the locking device is terminated. In this state, the lock of the key 22 prevents the first anti-rotation bracket 19 and the second anti-rotation bracket 20 from coming out upward, and the first anti-rotation bracket 19 and the second anti-rotation bracket 20 also rotate. Is prevented.

  Now, the operation of the locking device of the first embodiment will be described. When the refueling operation is completed and the opening 12 of the tank body 11 is closed, the male screw 16 of the screw plug 15 is screwed onto the female screw 13 of the tank body 11. Combine. Subsequently, the rotation restricting leg 19a is engaged with the rotation restricting recess 14 of the tank body 11 so that the engagement protrusion 17 of the screw cap 15 is inserted into the circular hole 19b of the first detent metal fitting 19. Let Next, the second anti-rotation fitting 20 is overlaid on the first anti-rotation fitting 19 so that the engagement protrusion 17 of the screw plug 15 is fitted into the engagement hole 21.

  At this time, since the engagement hole 21 of the second detent metal fitting 20 is formed in a cross shape, when the engagement protrusion 17 is inserted into the engagement hole 21a extending in one direction, the locking leg 20a. Is engaged with the engaging protrusion 17 in the engaging hole 21b that rotates 90 degrees and extends in the orthogonal direction. As a result, the engagement protrusion 17 can be quickly engaged with the engagement hole 21b, and the state shown in FIGS. In this state, as shown by a two-dot chain line in FIG. 3A, when the second rotation stopper 20 is rotated, the locking leg 20 a is turned to the rotation restriction leg 19 a of the first rotation stopper 19. Further rotation is stopped upon hitting this part. Thereafter, as shown in FIG. 2, by locking the engagement hole 21 of the second detent metal 20 through the operating arm 22 a of the key 22, the first detent metal 19 and the second detent metal 20 are moved upward. Pull-out is prevented.

  Next, when opening the opening 12 of the tank main body 11 and performing a fueling operation, an operation opposite to the above is performed. That is, after unlocking and removing the key 22, the second anti-rotation bracket 20 is extracted upward, and then the first anti-rotation bracket 19 is extracted upward. In this state, the refueling operation can be performed by unscrewing the male screw 16 of the screw plug 15 with respect to the female screw 13 of the opening 12 of the tank body 11 and removing the screw plug 15 from the opening 12 of the tank body 11. it can.

The effect exhibited by the above first embodiment will be described below.
In the locking device of the first embodiment, the engagement hole 21 of the second detent metal fitting 20 extends in a cross shape and can be engaged with the engagement protrusion 17 in the orthogonal direction. When the engaging protrusion 17 cannot be engaged with the engaging hole 21a extending in the direction, the engaging protrusion 17 can be easily engaged with the engaging hole 21b extending in the other direction. Therefore, it is not necessary to insert packing between the tank body 11 and the screw plug 15 or to cut the end of the second detent metal fitting 20 as in the prior art.

  A first rotation stopper 19 and a second rotation stopper 20 are provided as rotation stoppers. Therefore, as compared with the case of the second embodiment to be described later, the first anti-rotation bracket 19 can prevent the rotation of the tank main body 11 and the second anti-rotation bracket 20 can prevent the rotation of the first anti-rotation bracket 19. Well, since each has a single function, the degree of freedom in design can be increased. Further, since the large rotation restricting leg portion 19a of the first detent metal fitting 19 can be accommodated in the rotation restricting recess portion 14, the appearance is improved without being exposed like the locking leg portion 23a of the second embodiment. be able to.

Since the anti-rotation bracket is composed of the first anti-rotation bracket 19 and the second anti-rotation bracket 20, it can be formed thinner and lighter than the anti-rotation bracket 23 of the second embodiment, and the engagement hole Workability and handleability when changing the position of 21 can be improved.
(Second Embodiment)
Next, 2nd Embodiment of this invention is described based on FIGS. In the second embodiment, parts different from the first embodiment will be mainly described.

  In the second embodiment, the anti-rotation bracket 23 is configured by one metal fitting corresponding to the second anti-rotation bracket 20 of the first embodiment. That is, as shown in FIG. 4, the locking bracket 23 has a locking leg portion 23a that is larger and longer than the locking leg portion 20a of the second locking bracket 20, and the engagement hole 21 is a screw. It is formed in a cross shape so as to correspond to the engaging protrusion 17 of the stopper 15. Then, as shown in FIG. 5, the anti-rotation metal fitting 23 is put on the screw plug 15 so that the engagement protrusion 17 is inserted into the engagement hole 21. As shown in FIGS. 5, 6 (a), and 6 (b), the opening 12 of the tank body 11 is provided with a rotation restricting convex portion 24 that restricts the rotation of the rotation stopper 23 at a position facing the opening 180 degrees. It has been.

  As shown by a two-dot chain line in FIG. 6A, when the anti-rotation fitting 23 is put on the screw plug 15, the anti-rotation fitting 23 is turned counterclockwise so as to loosen the screw plug 15. The locking leg 23a abuts against the rotation restricting convex portion 24 of the tank body 11 to prevent further rotation. Therefore, in the second embodiment, as compared with the first embodiment, only one detent 23 is required, so that the configuration can be simplified and the locking operation and the unlocking operation can be performed more easily.

It should be noted that the present embodiment can be implemented with the following modifications.
As shown in FIG. 7, the second anti-rotation fitting 20 in the first embodiment and the engagement hole 21 of the anti-rotation fitting 23 in the second embodiment may be configured to extend in directions intersecting other than 90 degrees. it can.

The main body to which the screw cap 15 is screwed can also be applied to a heating boiler, a fuel oil stove tank, an engine oil storage tank of an automobile repair shop, and the like.
-About the internal thread 13 in the opening part 12 of the tank main body 11, and the external thread 16 in the screw plug 15, it is also possible to make the opening part 12 side into an external thread, and to make the screw plug 15 side into an internal thread.

Further, the technical idea that can be grasped from the embodiment will be described below.
5. The screw stopper locking device according to claim 4, wherein the engagement hole of the second detent metal fitting extends in a cross shape and can be engaged with the engagement protrusion in an orthogonal direction. When comprised in this way, when the 2nd detent metal fitting cannot be used in one direction, it can be easily used by rotating 90 degree | times, and can improve the effect of the invention which concerns on Claim 4. it can.

  A screw plug is screwed onto the main body to close the opening, and the engagement protrusion protruding on the screw plug is provided with a locking hole and an engagement hole through which the engagement protrusion is inserted. , Provided with a detent fitting whose rotation with respect to the main body is restricted when inserted into the engagement hole, and locking the detent fitting by locking the locking hole, and a closed state by a screw plug A locking method for a screw plug, characterized in that the locking hole extends in a direction in which the engagement holes of the detents intersect and can be engaged with an engagement protrusion in both directions. According to this locking method, a locking operation can be easily performed using a locking device having a simple configuration.

The disassembled perspective view which shows the locking device of the screw cap in 1st Embodiment. The perspective view which shows the state which assembled | attached the locking device of the screw plug and locked with the key. (A) is a top view which shows the screw stopper locking device, (b) is a front view which shows the screw stopper locking device, and (c) is a side view which shows the screw stopper locking device. The perspective view which shows the rotation stopper metal fitting of the locking device of the screw plug in 2nd Embodiment. The perspective view which shows the state which assembled | attached the locking device of the screw cap. (A) is a top view which shows the locking device of a screw stopper, (b) is the half cross section which looked at the locking device of the screw stopper from the front. The top view which shows the engagement hole of the rotation stopper metal fitting of another example.

Explanation of symbols

  DESCRIPTION OF SYMBOLS 11 ... Tank main body, 12 ... Opening part, 15 ... Screw stopper, 17 ... Engagement protrusion, 18 ... Locking hole, 19 ... 1st detent metal fitting, 20 ... 2nd detent metal fitting, 21, 21a, 21b ... Engagement Hole, 22 ... key, 23 ... detent fitting.

Claims (4)

The screw plug is screwed to the main body to close the opening, and the engagement protrusion projecting on the screw plug is provided with a locking hole, and has an engagement hole through which the engagement protrusion is inserted, A locking bracket that is restricted from rotating with respect to the main body while being inserted into the engagement hole is provided, and the locking bracket is prevented from coming off by locking the locking hole, and a closed state by a screw plug is provided. A locking device for holding,
A locking device for a screw plug, wherein the locking holes extend in directions intersecting with each other, and can be engaged with engaging protrusions in both directions. The screw cap locking device according to claim 1, wherein the screw cap is provided in an opening of a tank body. The locking device for a screw cap according to claim 1 or 2, wherein the engagement hole of the detent fitting extends in a cross shape and can be engaged with the engagement protrusion in an orthogonal direction. . The anti-rotation bracket includes a first anti-rotation bracket whose rotation is restricted with respect to the main body, and a second anti-rotation bracket which is arranged on the first anti-rotation bracket and is restricted from rotating with respect to the first anti-rotation bracket. The first engagement hole of the first detent fitting is formed in a circular hole shape so that the engagement projection can be rotated, and the second engagement hole of the second detent fitting extends in the intersecting direction. The screw plug locking device according to claim 1 or 2, wherein the locking device is configured to be able to engage with the engaging protrusion in both directions.

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