JP2010224088A - Bulb socket and current conduction-testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a bulb socket by which the flow of a current can be intuitively obtained, and to provide a current conduction-testing device. <P>SOLUTION: The current conduction-testing device 1 consists mainly of the bulb socket 10 for holding a bulb 5, a switch 40 for controlling a current conduction state and a current non-conduction state, and a battery box 30 for storing a battery 7. The device has a first electric wire 61 for connecting the battery box 30 and the bulb socket 10, a second electric wire 62 for connecting the bulb socket 10 and the switch 40, and a third electric wire 63 for connecting the switch 40 and the battery box 30. The bulb socket 10 is configured such that the first electric wire 61 and the second electric wire 62 directly come into contact with the respective terminals of the bulb 5, and the battery box 30 is configured such that the first electric wire 61 and the third electric wire 63 directly come into contact with the respective electrodes of the battery 7. Levers 41a and 41b of the switch 40 are configured such that the second electric wire 62 and the third electric wire 63 directly come into contact with each other. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a light bulb socket and an energization experiment apparatus, and more particularly to a light bulb socket and an energization experiment apparatus for use in science experiments of elementary school students.

  Some conventional light bulb sockets include a body having an opening for screwing a cap of the light bulb on one side thereof and a cover that covers the opening on the other side of the body (for example, Patent Document 1). Such a light bulb socket will be described below.

The socket disclosed in Patent Document 1 is mainly composed of a cylindrical body having an opening for screwing a lamp cap on one side thereof, and a cover covering the opening on the other side of the body. The cover incorporates a lead terminal that comes into contact with each terminal of the base, a connection terminal that can be connected by press-fitting the tip of the power supply line, and a release button for removing the power supply line from the connection terminal.
And since each component incorporated in the cover is stably supported in the arrangement state, it is said that the assembly of the body and the cover can be performed very easily.

Japanese Utility Model Publication No.59-28991

  In the conventional light bulb socket as described above, electricity from the power line reaches the light bulb via the release button, the connection terminal, and the lead terminal. Therefore, especially when conducting energization experiments in elementary school science classes, it was difficult to intuitively grasp the current flow.

  The present invention has been made to solve the above-described problems, and an object of the present invention is to provide a light bulb socket and an energization experiment apparatus that can intuitively grasp the current flow.

  In order to achieve the above object, the invention described in claim 1 is a light bulb socket to which a light bulb having a base part serving as one terminal and a central contact part serving as the other terminal is mounted. And a socket body portion that can be disposed so as to directly contact the first electric wire to the body portion of the engaged light bulb, and a central contact portion of the light bulb in the engaged state that is detachably attached to the socket body portion And a socket end portion that can be disposed so as to directly contact the second electric wire.

  If comprised in this way, a 1st electric wire and a 2nd electric wire will contact | connect the each terminal of a light bulb directly.

  According to a second aspect of the present invention, in the configuration of the first aspect, the socket body includes a cylindrical body having a threaded portion into which the body is screwed from the first opening portion on one side, and the threaded portion. An opening is formed, the first electric wire is wound around the threaded portion through the opening and the first opening portion, and the socket end portion is a pair of freely insertable into the second opening portion on the other side of the cylindrical body. A leg body and a coupling body that couples each of the leg bodies are included, and the second electric wire is wound around the coupling body.

  If comprised in this way, a 1st electric wire and a 2nd electric wire will be fixed by winding.

  According to a third aspect of the present invention, in the configuration of the second aspect of the present invention, when the socket end portion is inserted into the socket body portion and rotated in the circumferential direction of the cylinder body, the socket end portion is in a state of preventing the socket body portion from coming off. To match.

  If comprised in this way, there is no possibility that a socket edge part may accidentally drop from a socket trunk | drum.

  According to a fourth aspect of the present invention, in the configuration of the first aspect of the present invention, the socket body is made of a transparent material.

  If comprised in this way, the connection state of the 1st electric wire and the 2nd electric wire in a socket trunk | drum will be visible.

  The invention according to claim 5 is an energization test apparatus for confirming the energized state, and stores a light bulb socket capable of holding a light bulb, a switch for controlling the energized state and the de-energized state, and a battery. A battery box, a first wire connecting the battery box and the light bulb socket, a second wire connecting the light bulb socket and the switch, and a third wire connecting the switch and the battery box. Each of the third electric wires from the electric wires directly contacts each of the terminals of the light bulb held in the light bulb socket and each of the electrode of the battery accommodated in the battery box, and the second electric wire and the third electric wire are directly in the energized state. A light bulb socket, a switch, and a battery box are configured to be in contact with each other.

  If comprised in this way, each of a light bulb, a switch, and a battery will be directly connected via a 3rd electric wire from a 1st electric wire.

  According to a sixth aspect of the present invention, in the configuration of the fifth aspect of the present invention, the light bulb has a base part of the base serving as one terminal and a central contact part of the base serving as the other terminal, and the light bulb socket includes the body part. A socket body that can be disposed so that the first electric wire is in direct contact with the body of the engaged light bulb, and a socket body that is detachably attached to the center contact portion of the light bulb in the engaged state. And a socket end that can be arranged so as to be in direct contact with the second electric wire.

  If comprised in this way, a 1st electric wire and a 2nd electric wire will contact | connect the cap of a light bulb in the state which attached the socket edge part to the socket trunk | drum.

  According to a seventh aspect of the present invention, in the configuration of the fifth or sixth aspect of the present invention, the battery box includes a storage body that can store a battery, and a battery electrode that is attached to the storage body and is stored. A pair of supports provided at positions facing each other, and each of the first electric wire and the third electric wire is wound around each of the supports so as to contact each of the electrodes of the battery when stored. It is.

  If comprised in this way, each of a 1st electric wire and a 3rd electric wire will contact | connect each of the electrode of a battery in the winding state.

  As described above, according to the first aspect of the present invention, since the first electric wire and the second electric wire are in direct contact with each terminal of the light bulb, the current flow can be intuitively grasped.

  In addition to the effect of the invention of claim 1, the invention according to claim 2 is that the first electric wire and the second electric wire are fixed by winding, so that the first electric wire and the second electric wire are connected to each terminal of the light bulb. The contact state is stable.

  In addition to the effect of the invention of claim 2, the invention according to claim 3 has no fear that the socket end portion will inadvertently fall off from the socket body portion. Stabilize.

  In addition to the effects of the invention according to any one of claims 1 to 3, the invention according to claim 4 can visually check the connection state of the first electric wire and the second electric wire in the socket body, so that the current flow Can be understood more clearly.

  In the invention according to claim 5, since each of the light bulb, the switch, and the battery is directly connected from the first electric wire through the third electric wire, it is possible to intuitively grasp the current flow for lighting the light bulb. it can.

  In addition to the effect of the invention of claim 5, the invention according to claim 6 has the first electric wire and the second electric wire in contact with the cap of the light bulb with the socket end attached to the socket body. The connection state between the electric wire and the second electric wire is stabilized.

  According to the seventh aspect of the invention, in addition to the effect of the fifth or sixth aspect of the invention, each of the first electric wire and the third electric wire is in contact with each of the battery electrodes in the wound state. The connection state between each of the electric wires and the third electric wires and the battery is stabilized.

It is a perspective view which shows the electricity supply state of the electricity supply experiment apparatus by 1st Embodiment of this invention. It is a perspective view which shows the non-energized state which removed the battery of the electricity supply experiment apparatus shown in FIG. It is an expansion perspective view which shows the light bulb socket shown in FIG. It is a disassembled perspective view which shows the state which each component of the light bulb socket shown in FIG. 3 isolate | separated. FIG. 5 is a cross-sectional view taken along line VV shown in FIG. 3. It is an expansion perspective view which shows the electricity supply state of the switch shown in FIG. FIG. 7 is an enlarged perspective view showing a non-energized state of the switch shown in FIG. 6. FIG. 3 is an enlarged perspective view of the battery box shown in FIG. 2.

  FIG. 1 is a perspective view showing an energization state of the energization test apparatus according to the first embodiment of the present invention, and FIG. 2 is a perspective view showing a non-energization state with the battery removed from the energization experiment apparatus shown in FIG. is there.

  With reference to these drawings, the energization experiment apparatus 1 houses a light bulb socket 10 for holding a light bulb 5, a switch 40 for controlling an energized state and a non-energized state by a pair of levers 41a and 41b, and a battery 7. It is mainly composed of a battery box 30 for doing this. The first electric wire 61 connecting the battery box 30 and the light bulb socket 10, the second electric wire 62 connecting the light bulb socket 10 and the switch 40, and the third electric wire 63 connecting the switch 40 and the battery box 30. It has. Each electric wire is a so-called insulated electric wire in which a conductor made of copper wire is coated with an insulator made of vinyl and the conductor is exposed only at both ends.

  And each of the 1st electric wire 61 and the 2nd electric wire 62 is comprised so that each of the terminal of the light bulb 5 hold | maintained at the light bulb socket 10 may be contact | connected directly. Moreover, each of the 1st electric wire 61 and the 3rd electric wire 63 is comprised so that it may contact | connect directly each of the electrode of the battery 7 accommodated in the battery box 30 as shown in FIG. Furthermore, each of the 2nd electric wire 62 and the 3rd electric wire 63 is attached to the lever 41a and lever 41b of the switch 40, and is comprised so that it may mutually contact directly. A connection structure between each of the first electric wire 61, the second electric wire 62, and the third electric wire 63 and each of the bulb socket 10, the battery box 30, and the switch 40 will be described later.

  Then, when the light bulb 5 is attached to the light bulb socket 10, the battery 7 is accommodated in the battery box 30, and the second electric wire 62 and the third electric wire 63 attached to each of the levers 41a and 41b of the switch 40 are brought into direct contact, As shown in FIG. 1, the energization experiment apparatus 1 is in an energized state. That is, the light bulb 5 is turned on.

  Further, when the battery 7 accommodated in the battery box 30 is removed or the contacts of the levers 41a and 41b of the switch 40 are released, as shown in FIG. 2, the energization experiment apparatus 1 enters a non-energized state. That is, the light bulb 5 is turned off.

  Here, the connection between the light bulb socket 10 and each of the first electric wire 61 and the second electric wire 62 and the structure of the light bulb socket 10 will be described below.

  3 is an enlarged perspective view showing the light bulb socket shown in FIG. 1, FIG. 4 is an exploded perspective view showing a state in which each component of the light bulb socket shown in FIG. 3 is separated, and FIG. It is sectional drawing of the shown VV line.

  With reference to these drawings, the light bulb 5 has a base 71 having a cylindrical body 72 serving as one terminal and a central contact 73 serving as the other terminal disposed at the lower end in the figure. . The light bulb socket 10 is a cylindrical body 11 formed by injection molding of a transparent plastic, which becomes a socket body for mounting the light bulb 5, and a transparent plastic that is detachably attached to the cylindrical body 11. The socket end portion 12 is formed by injection molding.

  Since the cylinder body 11 is formed in a cylindrical shape, it has a first opening portion 16 and a second opening portion 17 at both ends thereof. Further, on the inner surface, a screwing portion 18 for screwing the barrel portion 72 of the base 71 is formed, and the barrel portion 72 of the bulb 5 is connected to the screwing portion 18 via the first opening portion 16. Screwed together. Further, an opening 14 is formed in the threaded portion 18 of the cylinder 11, and the opening 15 a extending in the circumferential direction of the cylinder 11 and a position opposite to the opening 15 a are formed on the second opening portion 17 side. An opening 15b (not shown) is formed.

  As described above, the first electric wire 61 includes the copper wire 65a and the polyester insulator 66a that covers the copper wire 65a, and the copper wire 65a is exposed at both ends of the first electric wire 61. The exposed copper wire 65 a is wound around the screwing portion 18 through the opening 14 and the first opening portion 16. That is, when the light bulb 5 is attached to the light bulb socket 10, the body portion 72, which is one terminal of the light bulb 5, is screwed into the threaded portion 18, so that the copper of the first electric wire 61 is shown in FIG. 5. The wire 65a and the trunk portion 72 of the light bulb 5 are in direct contact with each other.

  The socket end portion 12 can be inserted into the second opening portion 17 of the cylindrical body 11 and extends downward in the figure, and a protrusion connected to the upper portion of each of the leg bodies 23a and 23b. 24a and 24b, and the connection body 25 which connects the leg bodies 23a and 23b.

  As described above, the second electric wire 62 is composed of the copper wire 65b and the polyester insulator 66b covering the copper wire 65b, and the copper wire 65b is exposed at both ends of the second electric wire 62. The exposed copper wire 65b is wound around the connecting body 25. That is, in the mounted state of the light bulb 5, the legs 23a and 23b are inserted into the cylinder 11 through the second opening portion 17, so that the copper wire wound around the connecting body 25 as shown in FIG. 65b and the center contact part 73 which is the other terminal of the light bulb 5 are in direct contact.

  Further, the protrusions 24a and 24b and the openings 15a and 15b (not shown) can be formed by rotating the socket end 12 counterclockwise in the circumferential direction of the cylinder 11 after the socket end 12 is inserted into the cylinder 11. As shown in FIG. 3, they are formed so as to engage with each other. Accordingly, the socket end 12 is prevented from being detached from the cylinder 11, so that there is no possibility that the socket end 12 is inadvertently dropped from the cylinder 11. Therefore, the attachment state of the socket end 12 and the cylinder 11 is stabilized.

  As described above, each of the copper wire 65a of the first electric wire 61 and the copper wire 65b of the second electric wire 62 is fixed to each of the cylindrical body 11 and the connecting body 25 of the socket end portion 12 by winding. Therefore, the contact state of the first electric wire 61 with the body portion 72 of the light bulb 5 is stabilized, and the contact state of the second electric wire 62 with the central contact portion 73 of the light bulb 5 is stabilized.

  And since the 1st electric wire 61 and the 2nd electric wire 62 are directly in contact with the trunk | drum 72 and the center contact part 73 of the light bulb 5 by such a light bulb socket 10, it can grasp | ascertain intuitively the flow of the electric current with respect to the light bulb 5. it can.

  Moreover, since the cylinder 11 which is the socket body is formed of transparent plastic, the connection state between each of the first electric wires 61 and the second electric wires 62 and the light bulb 5 in the cylinder 11 is visually observed from the outside. can do. Therefore, the above-described current flow can be grasped more clearly.

  Next, the connection between the switch 40 and each of the second electric wire 62 and the third electric wire 63 and the structure of the switch 40 will be described below.

  6 is an enlarged perspective view showing an energized state of the switch shown in FIG. 1, and FIG. 7 is an enlarged perspective view showing a non-energized state of the switch shown in FIG.

  Referring to these drawings, the switch 40 is connected to each of a rectangular bottom plate 46, rectangular parallelepiped bearing portions 47a and 47b connected to both longitudinal ends of the bottom plate 46, and bearing portions 47a and 47b. Levers 41a and 41b. Each component of the switch 40 is formed by plastic injection molding.

  The lever 41a includes a shaft 51a extending in the short direction of the bottom 46, a lever body 52a extending from the shaft 51a in the longitudinal direction of the bottom 46, and a tip 53a connected to the end of the lever body 52a facing the shaft 51a. It is composed of The shaft 51a is rotatably connected to the bearing portion 47a. The lever 41b has the same configuration as the lever 41a, and its shaft 51b is rotatably connected to the bearing portion 47b.

  And the exposed copper wire 65b of the 2nd electric wire 62 is wound around the front-end | tip part 53a of the lever 41a. Further, as described above, the third electric wire 63 is composed of the copper wire 65c and the polyester insulator 66c covering the copper wire 65c, and the copper wire 65c is exposed at both ends of the third electric wire 63. And this exposed copper wire 65c is wound around the front-end | tip part 53b of the lever 41b. It should be noted that the distal end portion 53a of the lever 41a and the distal end portion 53b of the lever 41b are set so that a part of their respective rotation ranges overlap. Therefore, when the tip portions 53a and 53b overlap with each other as shown in FIG. 6, the copper wire 65b of the second electric wire 62 wound around the tip portions 53a and 53b and the copper wire 65c of the third electric wire 63 are in direct contact with each other. . That is, they are in a conductive (energized) state. Further, when the tip portions 53a and 53b are separated as shown in FIG. 7, the copper wire 65b of the second electric wire 62 and the copper wire 65c of the third electric wire 63 wound around the tip portions 53a and 53b are also separated. become. That is, it becomes a non-conduction (non-energization) state.

  Further, the switch 40 further includes a stopper member 44 for fixing the tip end portions 53a and 53b in the energized position as shown in FIG. The stopper member 44 has a protrusion 45 formed on the upper side of the lever 41b in an energized state so as to overlap a part of the lever 41b in plan view. When the protrusion 45 is moved from the original position of the lever 41b shown in FIG. 7 (a stop position in a rotatable state) to a position where the energization state shown in FIG. The rotational movement of the lever 41b upward (original position) is prevented, and the positions of the tip portions 53a and 53b are maintained. Therefore, the energized state of the switch 40 is stabilized. When it is desired to release the engagement by the stopper member 44, when the stopper member 44 is moved as shown by the arrow in FIG. 6, the protrusion 45 moves to release the engagement, so that the lever 41b is described above. Return to the original position. The stopper member 44 facilitates switching between energized and de-energized states by the levers 41a and 41b.

  Next, the connection between the battery box 30 and each of the first electric wire 61 and the third electric wire 63 and the structure of the battery box 30 will be described below.

  FIG. 8 is an enlarged perspective view of the battery box shown in FIG.

  Referring to the figure, a battery box 30 is formed by injection molding of plastic, and is a box-shaped storage body 32 for storing the battery 7, and is attached to the storage body 32, and the electrodes of the battery 7 when stored. It is comprised from a pair of support body 36a, 36b which consists of the rod-shaped plastics provided in the position which opposes each up and down.

  The exposed copper wire 65a of the first electric wire 61 is wound around the support 36a so as to be in contact with one of the electrodes of the battery 7 when stored. The exposed copper wire 65c of the third electric wire 63 is wound around the support 36b so as to be in contact with the other electrode of the battery 7 when stored. That is, when the battery 7 is housed in the battery box 30, each of the copper wire 65 a of the first electric wire 61 and the copper wire 65 c of the third electric wire 63 is in direct contact with each of the electrodes of the battery 7.

  Thus, each of the copper wire 65a of the 1st electric wire 61 and the copper wire 65c of the 3rd electric wire 63 is fixed to each of the support bodies 36a and 36b by winding. Accordingly, the contact state with one of the electrodes of the battery 7 when the first electric wire 61 is stored is stabilized, and the contact state with the other electrode of the battery 7 when the third electric wire 63 is stored is stabilized.

  Here, referring again to FIG. 1, in the energization test apparatus 1 according to this embodiment, the light bulb socket 10, the battery box 30, and the switch 40 are connected by the first electric wire 61, the second electric wire 62, and the third electric wire 63. Are connected as described above. That is, each of the light bulb socket 10, the battery box 30, and the switch 40 is directly connected via the first electric wire 61, the second electric wire 62, and the third electric wire 63. Therefore, it becomes the energization experiment apparatus 1 which can grasp | ascertain intuitively the flow of the whole electric current for lighting the light bulb 5, and becomes an excellent teaching material of a primary schoolchild.

  In the first embodiment, the light bulb socket has a specific structure including a socket body and a socket end. However, the light bulb socket can hold the light bulb, Other structures may be used as long as the second electric wire is in direct contact with each of the held bulb terminals.

  In the first embodiment, the socket body includes a cylindrical body having a specific shape. The socket body can be engaged with the body of the light bulb, and the first electric wire is directly connected to the body of the engaged light bulb. As long as it can arrange | position so that it may contact, you may be comprised by the other shape.

  Furthermore, in the first embodiment described above, the socket end portion is constituted by a pair of legs and a connecting body. However, the socket end portion is detachably attached to the cylindrical body, and is attached to the central contact portion of the engaged light bulb. As long as it can arrange | position so that two electric wires may contact | connect directly, you may be comprised by the other shape.

  Further, in the first embodiment, each of the first electric wire to the third electric wire is wound around and connected to each of the corresponding constituent members, but each of the first electric wire to the third electric wire is connected to the light bulb. If it is in direct contact with each of the terminals of the light bulb held in the socket and each of the electrodes of the battery stored in the battery box, and the second electric wire and the third electric wire are in direct contact with each other in the energized state via the lever of the switch, It may be connected by a method other than winding.

  Furthermore, in the first embodiment described above, the socket end is engaged with the tubular body in a state of being prevented from being detached by the protrusion, but the socket end is inserted into the tubular body and then the periphery of the tubular body. Any other shape may be used as long as it is engaged in a retaining state with respect to the cylinder by rotating in the direction. Moreover, these do not need to engage in the retaining state.

  Furthermore, in the first embodiment, the socket body is made of a transparent plastic material, but may be made of another material as long as it is a transparent material.

  Furthermore, in the first embodiment, the light bulb socket, the battery box, and the switch are made of a plastic material, but are not limited to being transparent or opaque, and may be made of any material.

  Furthermore, in the first embodiment, the battery box has a specific shape, but the battery box can store the battery, and the first electric wire and the third electric wire are stored in the battery. Other shapes may be used as long as they are in direct contact with each of the electrodes.

  Furthermore, in the first embodiment described above, the switch controls the energized state and the de-energized state by a pair of levers, but the switch can control the energized state and the de-energized state. Other structures may be used as long as the third wire is in direct contact with the energized state.

  Furthermore, in the first embodiment described above, each electric wire is composed of a conductor and an insulator covered with the conductor. For example, as long as it can be energized, such as one composed only of a conductor. It may be composed of other members.

DESCRIPTION OF SYMBOLS 1 ... Current test apparatus 5 ... Light bulb 7 ... Battery 10 ... Light bulb socket 11 ... Tube body 12 ... Socket end part 14 ... Opening 16 ... 1st open part 17 ... 2nd open part 18 ... Screwing part 23 ... Leg body 25 ... Connector 30 ... Battery box 32 ... Storage body 36 ... Support 40 ... Switch 61 ... First electric wire 62 ... Second electric wire 63 ... Third electric wire 71 ... Base 72 ... Body portion 73 ... Center contact portion The same in each figure Reference numerals indicate the same or corresponding parts.

Claims (7)

A light bulb socket to which a light bulb having a body portion of a base serving as a terminal and a central contact portion of the base serving as a second terminal is mounted,
A socket body portion that can be engaged with the body portion and can be disposed so as to directly contact the first electric wire with the body portion of the bulb in the engaged state;
A light bulb socket comprising: a socket end portion detachably attached to the socket body portion, and a socket end portion that can be arranged so as to directly contact a second electric wire with the central contact portion of the light bulb in the engaged state. The socket body includes a cylindrical body having a threaded portion into which the body is screwed from a first opening on one side, an opening is formed in the threaded portion, and the first electric wire is connected to the opening. Wound around the threaded portion through the first opening,
The socket end includes a pair of legs that can be inserted into the second open part on the other side of the cylindrical body, and a connecting body that connects each of the legs, and the second electric wire is connected to the connecting body. The light bulb socket according to claim 1, which is wound.   The light bulb socket according to claim 2, wherein when the socket end portion is inserted into the socket body portion and rotated in the circumferential direction of the cylindrical body, the socket end portion engages with the socket body portion in a retaining state.   The said socket trunk | drum is a light bulb socket in any one of Claims 1-3 comprised from a transparent material. An energization experiment device for confirming the energization state,
A light bulb socket that can hold the light bulb,
A switch for controlling the energized state and the de-energized state;
A battery box that can store batteries;
A first electric wire connecting the battery box and the bulb socket;
A second electric wire connecting the bulb socket and the switch;
A third electric wire connecting the switch and the battery box;
Each of the first electric wire to the third electric wire is in direct contact with each of the terminal of the light bulb held in the light bulb socket and each of the electrode of the battery stored in the battery box, and the second electric wire and the second electric wire. An energization experiment apparatus in which the light bulb socket, the switch, and the battery box are configured such that three electric wires are in direct contact with each other in the energized state. The light bulb has a body part of a base serving as one terminal and a central contact part of the base serving as the other terminal,
The bulb socket can be engaged with the barrel, and can be disposed so that the first electric wire is in direct contact with the barrel of the bulb in the engaged state, and is detachably attached to the socket barrel. The energization experiment apparatus according to claim 5, further comprising: a socket end portion that can be disposed so as to directly contact the second electric wire with the central contact portion of the light bulb in the engaged state. The battery box includes a storage body that can store the battery, and a pair of supports that are attached to the storage body and provided at positions facing each of the electrodes of the battery during storage,
Each of the said 1st electric wire and the said 3rd electric wire is wound around each of the said support body so that it may contact | connect each of the said electrodes of the said battery at the time of accommodation, The electricity supply experiment apparatus of Claim 5 or 6 .

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