JPH0657898U - Tank hole closure structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a closure structure that can be opened and closed by a simple operation and that presses a hatch with a force having a uniform and sufficient size to close a hole in a tank. [Constitution] An inlet port 14 provided in a manhole cover 12 of a tank body 10 of a tank truck is covered with a circular hatch 16. Above that,
A beam 18 having one end rotatably connected to the manhole cover 12 is provided, and a clamp 20 having a hook 22 is rotatably provided at a free end thereof. Hook the hook 22 on the pin 26 of the stopper beam 24, and
When 0 is rotated, the beam 18 rotates downward. As a result, the spring provided near the center of the beam 18
Compressed between beam 18 and hatch 16, hatch 16
Is pressed against the manhole cover 12 with a constant force. The hatch 16 is provided with packing 28, and the inlet port 14 is sealed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a structure for closing a hole in a tank, such as a manhole for a tank truck.

[0002]

[Prior art]

 Conventionally, for example, a tank truck manhole or the like has been blocked by a structure as shown in FIG. According to this structure, the manhole cover 82 is screwed and fixed to the manhole provided in the tank body 80. The manhole cover 82 is provided with an inlet port 84 and is closed by a circular hatch 86. Further, a beam 88 is rotatably attached to the manhole cover 82 via a hinge 90. The hatch 86 is suspended from the beam 88 and opens and closes the inlet port 84 as the beam 88 rotates. The beam 88 is provided with a screw hole near the center thereof, and a handle shaft 92 is screwed into the beam 88. In addition, the beam 88 is provided with a pin 94 at the end so that a stopper beam 96 provided on the manhole cover 82 can be hooked.

When the handle shaft 92 is turned in the screwing direction while the stopper beam 96 is hooked on the beam 88, the handle shaft 92 is in contact with the hatch 86, so that the beam 88 moves in the raising direction. However, since the beam 88 is also restricted from moving upward by the stopper beam 96, the handle shaft 92 strongly presses the hatch 86 against the manhole cover 82. Since the rubber packing 98 is interposed between the manhole cover 82 and the hatch 86, when the hatch 86 is strongly pressed, the inlet port 84 is in a sealed state.

[0004]

[Problems to be solved by the device]

 According to the prior art, when opening the hatch 86, the handle shaft 92 is rotated to loosen the pressing force applied to the hatch 86, and further the handle shaft 92 is rotated until the stopper beam 96 is disengaged, and then the beam 88 is rotated. It rotated to open the hatch 86. Moreover, when closing, the reverse operation was performed.

Therefore, when opening and closing, the handle shaft 92 has to be rotated a considerable number of times, which is a troublesome operation. Further, when closing, the handle shaft 92 was turned and tightened, but there were variations in tightening force because there were individual differences in the tightening force of the person performing the tightening work. In particular, if the tightening force is not sufficient, there is a problem that the liquid to be loaded may leak to the outside.

Therefore, an object of the present invention is to provide a closing structure which can be opened and closed by a simple operation, and which presses the hatch by a force having a uniform and sufficient size to close the hole of the tank. To do.

[0007]

[Means and Actions for Solving the Problems]

 In order to achieve such an object, the present invention adopts the following configuration as a means for solving the problems. That is, in a structure for closing a hole of a tank, which includes a hatch that covers the hole of the tank and a pressing member that presses the hatch against the tank main body from above to seal the hole of the tank, the pressing member is attached to the tank main body. A beam movably attached to the tank and a beam arranged above the hatch, and a rotatably attached to either the tank main body or the beam, and a hook provided on the other end for catching on a protrusion, A lever for fixing the free end of the beam to the tank body by a predetermined amount by being hooked by the other protrusion at the first rotation position and being rotated as it is to the second rotation position. The beam is deformed when it is brought closer to the tank body by the lever, and is composed of a spring member that gives a pressing force due to the reaction force to the hatch. That is the closed structure of the hole of the tank to be considered.

According to the tank hole closing structure of the present invention having the above-described structure, the lever rotatably attached to either the tank body or the beam has the other protrusion at the first rotation position. The free end of the beam is fixed to the main body of the tank by a predetermined distance when it is caught in the second position and rotated to the second position. As a result, the spring member is deformed by a predetermined amount, and the pressing force by the constant reaction force is applied to the hatch to close the hole of the tank.

[0009]

【Example】

 Next, a first embodiment of the present invention will be described with reference to the drawings. FIG. 1 shows a closed structure of a manhole provided in a tank truck tank. As shown in the figure, a manhole cover 12 is screwed and fixed to the manhole provided in the tank body 10 of the tank truck. The manhole cover 12 is provided with an inlet port 14, and the inlet port 14 is closed by the closing structure of the present invention.

The inlet port 14 is covered with a circular hatch 16. The hatch 16 is suspended by a beam 18 having a U-shaped cross section, and one end of the beam 18 is pivotally attached to the manhole cover 12 via a hinge 19. A fastener 20 is rotatably provided on the free end of the beam 18, and a hook 22 is provided on the fastener 20. The hooking claw 22 is hooked on a pin 26 of a stopper beam 24 fixed to the manhole cover 12. The hatch 16 is provided with a packing 28, and when the hatch 16 is pressed against the manhole cover 12, the inlet port 14 is sealed.

As shown in FIG. 2, a coil spring 30 is attached near the center of the beam 18 through a shaft 32 with a pedestal. The shaft 32 is passed through a fool hole 34 provided on the upper surface of the beam 18, and is fastened by a nut 36 on the upper side of the beam 18.

The coil spring 30 is attached in a state in which it is contracted by a predetermined length in advance. This is because a spring with a relatively small spring constant is used to generate a large spring load. As shown in FIG. 3, it is known that the spring load increases in proportion to the amount of deflection. Therefore, when it is desired to obtain the spring load X 1 by contracting the length K, it is usually necessary to use the spring A having a large spring constant. However, if the initial deflection L is given to the spring B having a small spring constant, the required spring load X can be obtained by contracting by the length K.

Next, a characteristic part of the shape of the fastener 20 will be described. As shown in FIG. 4, the inside 22a of the hook 22 provided on the fastener 20 has a shape in which two curves of an arc p1-p2 having a radius r1 and an arc p2-p3 having a radius r2 (<r1) are continuous. It has become. The center o1 of the arcs p1-p2 is displaced from the rotation axis 20a of the fastener 20 to the left side in the drawing. As a result, the arcs p1-p2 become a curve that is closer to the rotation axis 20a of the tightener 20 as it is closer to the point p2. Further, the center o2 of the arcs p2-p3 is slightly deviated from the rotary shaft 20a of the fastener 20 to the right side in the drawing. As a result, the arcs p2-p3 also become curves closer to the rotation axis 20a of the tightener 20 as they approach the point p2.

Next, an operation method for sealing the inlet port 14 will be described. 2, the fastener 20 is in the first pivoted position. Here, when the hooking claw 22 of the fastener 20 is hooked on the pin 26 and rotated in the direction of the arrow a, the contact position between the hooking claw 22 and the pin 26 is changed from the point p1 shown in FIG. Move toward point p2. Then, since the pin 26 is fixed, the rotating shaft of the fastener 20 is brought closer to the pin 26 according to the arcs p1-p2. As a result, the beam 18 rotates in the direction of arrow b.

During this time, when the lower end of the shaft 32 comes into contact with the hatch 16, thereafter, the upper end of the shaft 32 escapes from the fool hole 34, and the coil spring 30 is compressed between the beam 18 and the shaft 32. Although a strong force is required for this compression, the tightening force of the tightener 20 reduces the force necessary for the operation of the tightener 20 itself, and the coil spring 30 is easily compressed. When the coil spring 30 is compressed, the restoring force of the coil spring 30 presses the hatch 16 against the manhole cover 12 via the shaft 32 with a constant force. This seals the inlet port 14.

Then, the fastener 20 is finally moved to and stopped at the second rotation position shown in FIG. In this state, the pin 26 and the hook 22 are in contact with each other between the curves p2-p3 inside the hook 22 shown in FIG. By the way, between the curves p2 and p3, the point p2 is at a position where the rotation axis of the fastener 20 can be closest to the pin 26. Therefore, in order for the contact point between the pin 26 and the hook 22 to move to the side of the curve pq beyond the point p2, the coil spring 30 must be slightly compressed. Therefore, the fastener 20 does not move from the second rotation position unless the fastener 20 is positively operated.

As described above, according to the closed structure of the inlet port 14 of the first embodiment, the hatch 16 can be opened and closed simply by rotating the fastener 20, so that the opening and closing work can be performed with a single touch and is simple. In addition, since the tightening load when closed is due to the spring load, the tightening force is constant regardless of the operator.

Further, since the tightening member 20 acts as a lever, the force required for tightening is small, and the tightening can be performed strongly. Further, when the clamp 20 is moved to the second rotation position, it moves to a position where the beam 18 and the clamp 20 overlap each other, so that the portion projecting above the beam can be suppressed lower than the conventional one. This is because the height of the tank body can be increased by the amount that the hatch can be lowered, especially when there is an upper limit on the height of the vehicle such as a tank truck. It is valid.

Further, a protective cover or the like is usually covered over the closed structure, but the cost can be reduced or the weight can be reduced by lowering the protective cover. In addition, since the hooking claw 22 of the tightener 20 is composed of two curved lines, the rotation is locked at the second rotation position and the tightening is not loosened.

Next, a second embodiment will be described. Similarly to the first embodiment, the second embodiment also has a structure for closing the inlet port provided in the manhole cover of the tank truck. As shown in FIG. 6, the inlet port 42 provided in the manhole cover 40 is covered with a circular hatch 44. The hatch 44 is suspended from a beam 46 having a U-shaped cross section, and one end of the beam 46 is connected to a hinge 48 fixed to the manhole cover 40 by a pin 50.

A hole 51 provided in the beam 46 through which the pin 50 is inserted has a play in the longitudinal direction, and the beam 46 is rotatable about the pin 50 as an axis and is vertically movable. Further, a shaft 52 is arranged on the pin 50. The shaft 52 has its lower end connected to the pin 50, penetrates a stupid hole (not shown) provided in the upper surface of the beam 46, and projects upward. A plurality of leaf springs 54 (nine in the figure) are fitted to the projecting portion and fastened by nuts 56.

A clamp 58 is rotatably provided at the free end of the beam 46. The fastener 58 acts as a lever to rotate the beam 46 and locks the pin 62 of the stopper beam 60 by a mechanism similar to that of the first embodiment. In the second embodiment, when the fastener 58 is hooked on the pin 62 to move the fastener 58 to the second rotation position shown in FIG. 6, the free end of the beam 46 is pulled downward as in the first embodiment. At this time, a pin 66 that connects the connector 64 and the beam 46 is in contact with a connector 64 that is integrally provided with the hatch 44 to suspend the hatch 44, and the beam 46 rotates about this point. Lift the shaft side up. Since the beam 46 is connected to the pin 50 by the hole 51 so as to be vertically movable, the beam 46 moves upward. As a result, the leaf spring 54 is compressed and its restoring force pushes the beam 46 downward. This downward pressing force is transmitted to the connector 64 by the pin 66, and becomes a force for pressing the hatch 44 downward. As a result, the inlet port 42 is sealed.

As described above, also in the closing structure of the inlet port 42 of the second embodiment, a good closing structure that is the same as that of the first embodiment can be obtained. Next, a third embodiment will be described. In the first embodiment, the clamp 20 is rotatably provided at the free end of the beam 18, whereas in the third embodiment, as shown in FIG. It is rotatably mounted on the body 74 and is hooked on a pin 78 provided at the free end of the beam 76 in the first pivoted position shown. Then, when the fastener 70 is tilted and rotated to the second rotation position, the same closure as in the first embodiment is made.

This blockage structure also operates similarly to that of the first embodiment, and good blockage is possible. In particular, since the fastener 70 is provided on the tank body 74 side, the number of movable parts on the beam 76 side is reduced, the beam 76 side can be lightened, and the hatch can be easily opened and closed. Although the embodiment of the present invention has been described above, the present invention is not limited to this, and various modes can be adopted without departing from the scope of the present invention.

For example, in the embodiment, the coil spring and the leaf spring are shown as the spring member, but other spring members may be used.

[0026]

[Effect of device]

 As described above, according to the present invention, since the lever hooked on the protrusion at the first rotation position is rotated to the second position to seal the hole of the tank, the opening / closing operation can be performed with one touch. Also, the rotation of the lever causes the spring member to deform by a certain amount, and the pressing force due to the constant reaction force is applied to the hatch, so the tightening force for closing is constant regardless of the operator, and as designed It can be closed by the tightening force, and the safety is enhanced. However, since the lever acts as a lever, the force required by the operator is reduced. Further, the height of the structure can be made lower than that of the conventional one.

[Brief description of drawings]

FIG. 1 is a configuration view showing a partially closed structure of a tank closing structure according to a first embodiment.

FIG. 2 is a configuration diagram showing a part of a main part of the first embodiment when the lever is at the first rotation position.

FIG. 3 is a graph showing a relationship between a spring load and a deflection amount.

FIG. 4 is an enlarged view showing components of the first embodiment.

FIG. 5 is a configuration diagram showing a partially cutaway main part when the lever is at the second rotation position in the first embodiment.

FIG. 6 is a configuration diagram showing a main part of a closed structure of a tank according to a second embodiment.

FIG. 7 is a configuration diagram showing a main part of a closed structure of a tank according to a third embodiment.

FIG. 8 is a configuration diagram showing a partially closed structure of a conventional tank closing structure.

[Explanation of symbols]

10,74 ... Tank body, 12, 40 ... Manhole cover, 14, 42 ... Inlet port, 1
6,44 ... Hatch, 18, 46, 76 ... Beam, 19, 48, 72 ... Hinge, 20, 58, 70
... Clamps, 22 ... Hooking claws, 24, 60 ... Stopper beams, 26, 50, 62, 66, 78 ... Pins, 28 ... Packing, 30 ... Coil springs, 3
2, 52 ... Shaft, 34 ... Stupid hole, 36, 5
6 ... Nut, 51 ... Hole, 54 ... Leaf spring, 6
4 ... Connector.

Claims (1)

[Scope of utility model registration request] 1. A tank hole closing structure, comprising: a hatch that covers a hole of a tank; and a pressing member that presses the hatch against the tank body from above to seal the hole of the tank, wherein the pressing member is the tank. A beam rotatably attached to the main body and arranged above the hatch, and a hook portion rotatably attached to either the tank main body or the beam and hooked on a protrusion provided on the other. A lever for fixing the free end of the beam to the tank body by a predetermined amount by being hooked by the other protrusion at the first rotation position and being rotated to the second rotation position as it is. And a spring member that is deformed when the beam is brought closer to the tank body by the lever, and that gives the hatch a pressing force due to its reaction force. Closure structure of the hole in the tank, characterized.