JP5270427B2 - Incorrect connection prevention device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To prevent a direct connection of a hose to a plug, and to successfully allow a connection of a joint member to the plug. <P>SOLUTION: A cylindrical casing 21 attachable to the plug 3 includes: a cover member 22; a movable member 23; first biasing means 24 biasing the cover member 22 toward the covered position side; and second biasing means 25 biasing the movable member 23 toward the protruding position side. The movable member 23 is configured to be switchable between an engaged state allowing an engaging portion 26 to engage with a locking groove 16 on a regulating surface 29 for engagement while positioning on the protruding position, and a disengaged state allowing the engaging portion 26 to disengage from the locking groove 16 on a regulating surface 30 for disengagement positioning on the retreat position. The inner diameter of the movable member 23 is configured to be larger than the outer diameter of the hose. The size of the movable member 23 in the radial direction is configured to permit the contact between a sleeve member 7 and the movable member 23 when connecting the joint member 1 to the plug 3. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

The present invention relates to an erroneous connection preventing device that prevents a hose (for example, a gas hose) that should be connected to a plug through a joint member from being directly connected to the plug.
The erroneous connection prevention device proposed in the present application is not conventionally known, and has been newly developed by the inventors based on their own problems as a result of earnest research.

  Patent Document 1 discloses a structure in which a gas hose is connected to a plug provided in a gas rice cooker as an example of a gas appliance via a joint member that is a subject of the present application. In this patent document 1, the connection detection means is provided in the plug, thereby reliably detecting an erroneous connection state in which the gas hose is directly connected to the plug of the gas equipment.

  This application also relates to the problem that when a hose is connected to a plug provided on the gas equipment side, a normal connection state in which the hose is connected to the plug directly occurs and a problem in which the hose is directly connected to the plug occurs. Whereas Reference 1 was intended to identify and detect both states, the present application actively prevents the occurrence of an erroneous connection state by mounting the erroneous connection prevention device referred to herein on the plug. .

  Hereinafter, first, in the present application, the connection of the hose 2 to the plug 3 via the joint member 1 as a premise thereof will be described. FIG. 1 shows the structure of the joint member 1, and FIG. 2 shows the structure of the plug 3. FIG. 1 shows a closed state in which the outflow of fluid from the joint tip is stopped without connecting the joint member 1 to the plug 3. On the other hand, FIG. 3 shows a state in which the joint member 1 is connected to the plug 3, a fluid flow path is formed across the hose 2, the joint member 1, and the plug 3, and gas can be supplied from the hose 2 side to the gas device. Show. In this state, the joint member 1 is in an open state in which the outflow of fluid from the joint tip is allowed.

  Hereinafter, the configuration of 1 joint member 1, the configuration of 2 plug 3, 3 the operation of connecting the joint member 1 to the plug 3, 4 the operation of separating the joint member 1 from the plug 3 will be described in this order. .

1 Configuration of Joint Member As shown in FIG. 1, the joint member 1 includes a connector 4 to which a hose 2 is connected, a cylindrical main body 5 connected to the connector 4, an axial direction in the cylindrical main body 5 (left and right direction in the figure). ) Movable actuating member 6, sleeve member 7 that is movable in the axial direction at the outer peripheral portion of cylindrical main body 5, and non-connector side of cylindrical main body 5. A lock ball 8 whose position in the vertical direction in the figure is regulated is provided. The joint member 1 is provided with a cover member 9 integrated with the cylindrical main body 5 and a tip member 10 for positioning the locking ball 8 from the tip side. Between the connector 4 and the operating member 6, a first coil spring 11, which is an urging member that urges the operating member 6 toward the distal end with respect to the connector 4, is provided. A second coil spring 12, which is an urging member that urges the sleeve member 7 toward the distal end side with respect to the cover member 9, is provided.

  Here, the cover member 9 is mainly used by an operator to hold the joint member 1 when the joint member 1 is connected to the plug 3. On the other hand, as shown in FIG. 1, the sleeve member 7 is movable in the axial direction with respect to the cylindrical main body 5 and the tip member 10, and in the closed state, the sleeve member 7 is at the tip. The end surface of the member 10 is positioned at substantially the same position. On the other hand, as shown in FIG. 3, in the above-described open state, the sleeve member 7 is positioned at a position where the sleeve member 7 protrudes toward the distal end side with respect to the distal end member 10.

  A non-connector side portion of the sleeve member 7 in the axial direction is provided with a first restricting surface 7a for restricting the locking ball 8 to the outer diameter side position, and the connector side (right side in the figure) from the first restricting surface 7a. ) Is provided with a second restricting surface 7b for restricting the locking ball 8 to the inner diameter side position. Further, when the locking ball 8 is regulated to the outer diameter side position in the radial direction by the first regulating surface 7 a, it is in contact with the locking ball 8 and is located at the connector side position in the axial direction of the sleeve member 7. The holding position holding surface 7c to hold is provided between the first regulating surface 7a and the second regulating surface 7b in the axial direction. In the closed state shown in FIG. 1, due to the positional relationship between the locking ball 8 and the sleeve member 7, the locking ball 8 is restricted from moving in the radial direction by the first regulating surface 7a, and the operating member 6 is moved to the non-connector side. With the moved closed posture, the outflow of fluid from the joint tip on the non-connector side is stopped. On the other hand, in the open state shown in FIG. 3, due to the positional relationship between the locking ball 8 and the sleeve member 7, the locking ball 8 is restricted from moving in the radial direction by the second restriction surface 7b, and the actuating member 6 moves to the connector side. In such an open position, fluid outflow from the joint tip is allowed. Thus, the joint member 1 is configured to be switchable between a closed state and an open state.

2 Configuration of Plug The plug 3 includes a plug body and a connection portion 13 to which the joint member 1 is connected, and the internal fluid flow from the distal end (right side in the figure) to the proximal end (left side in the figure). A path 14 is provided, and includes a first annular portion 15, a lock groove portion 16 that receives the locking ball 8, and a second annular portion 17 from the proximal end of the connecting portion 13 toward the distal end side.
In the example shown in the figure, the first annular portion 15 and the second annular portion 17 are configured to have the same diameter, and the lock groove portion 16 is configured as a substantially triangular groove.

3 Connection operation of the joint member to the plug When connecting the joint member 1 to the plug 3, the operator holds the cover member 9 of the joint member 1 and moves the joint member 1 to the plug proximal end side. The plug 3 is caused to enter the inside of the joint member 1. In this state, the joint member 1 is in the closed state shown in FIG. In the entering operation, the tip of the plug 3 abuts against the tip of the operating member 6 to push in the operating member 6, and the joint member 1 is switched from the closed state shown in FIG. 1 to the open state shown in FIG. At this time, when the locking ball 8 is fitted into the locking groove 16 as the plug 3 enters, the contact between the locking ball 8 and the contact position holding surface 7c is released, and the joint base of the sleeve member 7 is released. The position holding to the end side is released, and the sleeve member 7 projects to the front end side. This state is the state shown in FIG. 3, that is, the open state.

4 Separation operation of the joint member from the plug When the connection of the joint member 1 from the plug 3 is released, the operator holds the sleeve member 7 of the joint member 1 and puts the sleeve member 7 on the proximal end side of the joint member 1. Move. In the state before the movement, the joint member 1 is in the open state shown in FIG. In the moving operation, the sleeve member 7 is moved to the proximal end side against the urging force of the second coil spring 12, and the locking ball 8 comes to a position facing the first regulating surface 7a, so that the locking ball 8 can be detached from the lock groove 16, the sleeve member 7 can be returned to the base end side, and the joint member 1 can be separated from the plug 3. This state is the state shown in FIG. 1, that is, the closed state.

JP 2006-83989 A

  In the configuration shown in FIGS. 1 to 3, although the joint member can be properly connected to the plug, it is not possible to prevent an erroneous connection in which the hose is directly connected to the plug. And even if it is an apparatus which can prevent a misconnection, it is necessary to set it as the apparatus which can perform this satisfactorily at the time of the connection of a coupling member simultaneously.

  The present invention has been made in view of the above problems, and the object thereof can be employed in a hose connection structure for connecting a joint member as described above to a plug, and a direct connection of a hose to a plug. This is to prevent this, and to provide an erroneous connection prevention device that can satisfactorily perform the connection of the joint member to the plug.

In order to achieve this object, the misconnection prevention device according to the present invention is characterized in that a connector to which a hose is connected, a sleeve member movable in the axial direction, and a coupling member having a locking ball are connected. The plug provided with the connecting portion is provided with an internal fluid flow path extending from the distal end to the proximal end in the axial direction, and receives the first annular portion and the locking ball from the proximal end to the distal end side of the connecting portion. In the misconnection prevention device used for the hose connection structure provided with the lock groove and the second annular portion, and connecting the joint member to the plug,
The cylindrical housing that can be attached to the plug includes a covering position that covers the first annular portion, the lock groove portion, and the second annular portion at an outer peripheral portion of the connection portion, the first annular portion, and the lock groove portion. And a covering member that is movable in the axial direction to an exposure position at which the second annular portion is exposed, and protrudes closer to the plug tip than the covering member that is positioned in the covering position in the axial direction at the outer peripheral portion of the covering member. A movable member that is movable in the axial direction between a protruding position and a retracted position that is retracted toward the plug base end side relative to the protruding position; and a first urging means that urges the covering member toward the covering position in the axial direction. And a second urging means for urging the movable member in the axial direction toward the protruding position, and the covering member is restricted in a radial position of the cylindrical housing on an inner diameter surface of the movable member. Engaged with the locking groove An engagement portion is provided, and the position in the axial direction is configured to be freely held at the covering position by the engagement between the engagement portion and the lock groove portion, and the movable member is located at the protruding position. An engagement state in which the engagement portion is restricted to an engagement inner diameter side position in the radial direction by an engagement restriction surface provided on the inner diameter surface and the engagement portion is engaged with the lock groove portion, and is positioned at the retracted position. In the axial direction, the engagement portion is regulated to the disengagement outer diameter side position in the radial direction by the engagement release regulating surface provided on the inner diameter surface on the plug tip side with respect to the engagement regulating surface. The engagement member is configured to be switchable to a disengaged state in which engagement of the engagement portion with the lock groove portion can be released, and an inner diameter of the movable member is configured to be larger than an outer diameter of the hose, and the diameter of the movable member When connecting the joint member to the plug, the size in the direction It lies in the serial sleeve member and said movable member is formed to a size that enables contact.

  According to this configuration, the covering member is positioned at the covering position by the urging force of the first urging means, and the movable member is positioned at the protruding position by the urging force of the second urging means to switch to the engaged state. It has been. The engagement member and the lock groove are engaged with each other by restricting the radial movement of the engagement portion by the engagement restricting surface of the movable member located at the protruding position, and the position of the covering member in the axial direction becomes the covering position. The position is maintained.

  When connecting the joint member to the plug, the worker moves the joint member to the plug proximal end side with respect to the plug. At this time, the size of the movable member in the radial direction is such that the sleeve member of the joint member and the movable member can come into contact with each other, and the movable member located at the protruding position is closer to the plug tip side than the covering member. Since it protrudes, the sleeve member of the joint member and the movable member come into contact with each other, and the movable member is pressed to the plug base end side by the sleeve member. Thus, the movable member is moved from the protruding position to the retracted position and switched to the disengaged state, and the radial movement of the engaging portion is restricted by the disengagement restricting surface.

  Here, the retraction position is a position within a range in which the movable member can move to the plug base end side with respect to the protruding position. For example, the plug of the covering member positioned at the plug distal end side of the movable member and the covering position. The position of the movable member at which the distal end side end portion is substantially the same position in the axial direction, the plug distal end side end portion of the movable member and the plug distal end side end portion of the covering member moved to the plug base end side from the covering position are the axis line The position of the movable member that is substantially the same in the direction, and the position of the movable member that is retracted to the plug base end side from the plug tip side end portion of the covering member in which the plug tip side end portion of the movable member is located at the exposed position. Is included.

  Further, when the joint member is moved to the plug base end side, the sleeve member and the movable member are in contact with each other, and the distal end portion of the joint member and the covering member are in contact with each other, so that not only the movable member but also the covering member is plug base. A pressing operation is performed on the end side. At this time, by pressing the covering member toward the plug base end, the engaging portion is also pressed toward the plug base end. Here, as described above, since the engagement release restricting surface restricts the radial movement of the engagement portion, the engagement portion moves from the engagement inner diameter side position to the engagement release outer diameter side position. Is allowed to move to the radially outer diameter side and is detached from the lock groove. Accordingly, the covering member located at the covering position is allowed to move toward the plug base end side, and the covering member is moved from the covering position to the exposed position. Since the first annular portion, the lock groove portion and the second annular portion are exposed by the movement of the covering member, the joint member can be connected to the exposed connection portion, and the connection state in which the joint member is connected to the plug. It can be.

  On the other hand, even if the hose is directly connected to the plug, since the inner diameter of the movable member is larger than the outer diameter of the hose, the hose and the movable member are not in contact with each other. The plug cannot be pushed to the base end side of the direction. As a result, the erroneous connection preventing device is switched to the engaged state by positioning the movable member at the protruding position, and the engagement portion and the lock groove portion are engaged so that the position of the covering member in the axial direction is at the covering position. Is retained. Accordingly, each of the second annular portion, the lock groove portion, and the first annular portion is covered with the covering member located at the covering position, and the hose cannot be connected to the connecting portion, and the hose is directly connected to the connecting portion. It is possible to prevent connection.

  From the above, it is possible to prevent the direct connection of the hose to the plug, and it is possible to realize an erroneous connection prevention device that can satisfactorily perform the connection of the joint member to the plug.

  A further characteristic configuration of the erroneous connection preventing apparatus according to the present invention is that the covering member is provided with a plurality of the engaging portions at intervals in the circumferential direction of the connecting portion.

  According to this characteristic configuration, when the movable member is switched to the engaged state, each of the plurality of engaging portions is engaged with the lock groove portion, so that the position holding of the covering member at the covering position is firmly performed. It can be carried out. Therefore, even if it is going to connect a hose directly to a plug, since a position holding to a covering position of a covering member can be performed firmly, it can prevent reliably that a hose is connected to a connecting part directly.

  A further characteristic configuration of the erroneous connection preventing device according to the present invention is such that the covering member, as the engaging portion, is integrally movable with the covering member in the axial direction and with respect to the covering member in the radial direction. An engagement ball supported movably is provided.

  According to this characteristic configuration, when the movable member is switched to the engaged state, the engagement ball is engaged with the lock groove portion, and when the movable member is switched to the disengaged state, the engagement ball rolls. Thus, the engagement of the engagement ball with the lock groove can be released. Therefore, engagement and disengagement between the engagement portion and the lock groove portion can be appropriately performed using the rolling of the engagement ball, and durability of the engagement portion can be improved.

  According to a further characteristic configuration of the erroneous connection preventing device according to the present invention, the covering member is provided with a swinging portion extending in the axial direction and swingable in the radial direction, and the swinging portion is used as the engaging portion. The bulging part which bulges in the radial direction inner diameter side is provided in the inner peripheral part.

  According to this characteristic configuration, when the movable member is switched to the engaged state, the swollen portion engages with the lock groove portion by swinging of the swinging portion, and when the movable member is switched to the disengaged state. The engagement of the bulging portion with respect to the lock groove portion can be released by the swinging of the swinging portion. Therefore, engagement and disengagement between the engagement portion and the lock groove portion can be appropriately performed using the swing of the swing portion.

  According to a further characteristic configuration of the erroneous connection preventing device according to the present invention, the cylindrical housing projects closer to the plug tip side than the movable member positioned at the projecting position in the axial direction at an outer peripheral portion of the movable member. It is in the point which is formed in the shape and the shape which covers the perimeter of the circumferential direction of the said movable member.

  According to this characteristic configuration, when connecting the joint member to the plug, the operator moves the joint member to the plug proximal end side. At this time, the plug distal end side rather than the movable member located at the protruding position. The joint member can be moved to the plug base end side while guiding the outer peripheral portion of the sleeve member at the inner peripheral portion of the cylindrical casing protruding in the direction. Therefore, for example, the joint member can be easily moved to the plug base end side in a state where the center axis of the plug and the center axis of the joint member are aligned, and the operator's operation when connecting the joint member to the plug can be performed. Simplification can be achieved.

  A further characteristic configuration of the erroneous connection preventing device according to the present invention is such that the covering member is formed in a circular cylindrical shape covering the entire circumference of the connecting portion in the columnar shape, and the movable member is the covering It exists in the point formed in the circular cylinder shape covering over the perimeter of the circumferential direction of a member.

  According to this characteristic configuration, the covering member and the movable member can be formed in a simple shape. For example, even if a plurality of engaging portions are arranged at intervals in the circumferential direction, On the other hand, the radial movement can be accurately regulated by the inner diameter surface of the cylindrical movable member.

  A further characteristic configuration of the erroneous connection prevention device according to the present invention is a connection release member that releases the connection of the joint member to the plug by a movement operation in an axial direction in a connection state in which the joint member is connected to the plug. The connection release member is configured to be capable of releasing the connection of the joint member to the plug by pressing the plug proximal end of the movable member by a movement operation in the axial direction. It is in.

  According to this feature, the connection of the joint member to the plug can be released simply by moving the connection release member in the axial direction, and the operation for releasing the connection of the joint member to the plug is facilitated.

  A further characteristic configuration of the erroneous connection preventing device according to the present invention is such that the connection release member is an internal contact portion that can freely contact the plug base end side end portion of the movable member at an inner peripheral portion of the cylindrical housing. And an external operation part that can be moved in the axial direction at the outer peripheral portion of the cylindrical housing, and the internal abutment part is made to move toward the plug base end side of the movable member by the movement operation in the axial direction of the external operation part It exists in the point comprised so that it may contact | abut to an edge part and can be pressed.

  According to this characteristic configuration, the connection of the joint member to the plug can be released simply by moving the external operation part that can be moved and moved in the axial direction at the outer peripheral portion of the cylindrical housing. The operation when releasing the connection of the members becomes easy. Moreover, in the connected state in which the joint member is connected to the plug, the sleeve member is positioned inside the cylindrical housing. However, the sleeve member can be pressed by operating the external operation unit, and the plug The operation when releasing the connection of the joint member to is easier to perform.

  According to a further characteristic configuration of the erroneous connection preventing apparatus according to the present invention, the second urging means is disposed between the internal contact portion of the connection release member and the movable member in the axial direction, The urging force of the urging means urges the connection release member to a position where it comes into contact with the proximal end portion of the plug in the axial direction.

  According to this characteristic configuration, the connection release member abuts against the proximal end portion of the plug in the axial direction by the urging force of the second urging means, so that the connection release member is brought into contact with the contact end portion of the connection release member and the proximal end portion of the plug. Is restricted from moving toward the plug proximal end. Therefore, even if the hose is directly connected to the plug, the connection release member does not move to the plug base end, so that it is ensured that the movable member accidentally moves to the plug base end side with this movement. It is possible to prevent erroneous connection.

Cross section of joint member Cross section of plug Sectional view of the joint member and plug in the connected state where the joint member is connected to the plug The disassembled perspective view of the misconnection prevention apparatus in 1st Embodiment Sectional drawing of the plug with which the misconnection prevention apparatus in 1st Embodiment was mounted | worn, and a coupling member Sectional drawing of the plug with which the misconnection prevention apparatus in 1st Embodiment was mounted | worn, and a coupling member Plug and hose equipped with the erroneous connection prevention device in the first embodiment Sectional drawing of the plug with which the misconnection prevention apparatus in 1st Embodiment was mounted | worn, and a coupling member The disassembled perspective view of the misconnection prevention apparatus in 2nd Embodiment Sectional drawing of the plug with which the misconnection prevention apparatus in 2nd Embodiment was mounted | worn, and a coupling member Sectional drawing of the plug with which the misconnection prevention apparatus in 2nd Embodiment was mounted | worn, and a coupling member Sectional drawing of the plug and hose with which the misconnection prevention apparatus in 2nd Embodiment was mounted | worn Sectional drawing of the plug with which the misconnection prevention apparatus in 2nd Embodiment was mounted | worn, and a coupling member

Embodiments of an erroneous connection preventing apparatus according to the present invention will be described below with reference to the drawings.
[First Embodiment]
In the hose connection structure for connecting the joint member 1 to the plug 3 described in FIGS. 1 to 3, the erroneous connection preventing device 20 according to the present invention is used by being attached to the plug 3 side. Connection to the plug 3 is allowed, and the hose 2 (specifically, a gas hose) is prevented from being directly connected to the plug 3.

Based on FIG.4, FIG5 and FIG.6, the structure of the misconnection prevention apparatus 20 is demonstrated. FIG. 4 is an exploded perspective view of the erroneous connection preventing device 20. 5 and 6 are cross-sectional views of the misconnection prevention device 20, the plug 3, and the joint member 1, and show respective states when the joint member 1 is connected to the plug 3 on which the misconnection prevention device 20 is mounted. ing.
In the following description, the axial direction is the vertical direction in FIGS. 5 and 6, and the radial direction is the horizontal direction in FIGS. 5 and 6. Moreover, the plug distal end side in the axial direction is the upper side in the vertical direction in FIGS. 5 and 6, and the plug proximal end side in the axial direction is the lower side in the vertical direction in FIGS. 5 and 6.

  The erroneous connection preventing device 20 includes a circular cylindrical tubular casing 21 that can be attached to the plug 3, a circular cylindrical covering member 22 that covers the outer peripheral portion of the columnar connecting portion 13 in the plug 3, and a covering member A movable member 23 that is movable in the axial direction at the outer peripheral portion 22, a third coil spring 24 (corresponding to the first biasing means) that biases the covering member 22 toward one side in the axial direction, and an axis that moves the movable member 23 A fourth coil spring 25 (corresponding to second urging means) that urges one side in the direction is provided. A movable member 23 is disposed inside the cylindrical housing 21, and a covering member 22 is disposed inside the movable member 23.

  The covering member 22 includes a plug tip side portion of the first annular portion 15, a covering position (see FIG. 5A) covering the lock groove portion 16 and the second annular portion 17, and a plug tip side portion of the first annular portion 15. The outer peripheral portion of the connecting portion 13 is slidable in the axial direction at an exposed position (see FIG. 6B) where the lock groove portion 16 and the second annular portion 17 are exposed. When the covering member 22 is located at the covering position, as shown in FIG. 5A, the plug tip side (upward in the vertical direction in the figure) is connected to the entire second annular portion 17 in addition to the entire connection portion 13. The tip is covered. Further, for example, in addition to the entire second annular portion 17, a continuous portion that is continuous with the second annular portion 17 in the inclined portion that is continuous with the second annular portion 17 from the distal end portion of the connection portion 13 is positioned at the covering position. It can also be configured to cover with the member 22.

  The third coil spring 24 biases the covering member 22 in the axial direction toward the covering position (upward in the vertical direction in FIGS. 5 and 6). The plug base end side end portion 22 a in the axial direction of the covering member 22 is configured to be engageable with an outer diameter side bulging portion 13 a provided at the outer peripheral portion of the connection portion 13. The engagement of the plug base end side end portion 22a and the outer diameter side bulging portion 13a restricts the movement of the covering member 22 beyond the covering position to the plug distal end side.

  The covering member 22 includes an engaging ball 27 as an engaging portion 26 whose radial position is restricted by the inner diameter surface of the movable member 23 and can be engaged with the locking groove portion 16. The engaging ball 27 and the locking groove portion 16 are provided. The position in the axial direction is configured to be freely held at the covering position by engagement. As shown in FIG. 4, a plurality of engagement balls 27 are provided at intervals in the circumferential direction of the connection portion 13. For example, three engagement balls 27 are provided, and the three engagement balls 27 are arranged at the same interval (for example, 120 degrees) in the circumferential direction of the connection portion 13. The covering member 22 is formed with a circular mounting hole 28 penetrating in the radial direction, and an engagement ball 27 is disposed in the mounting hole 28. Accordingly, each of the plurality of engaging portions 26 is configured by an engagement ball 27 that is supported so as to be movable integrally with the covering member 22 in the axial direction and movably with respect to the covering member 22 in the radial direction. ing. That is, the engagement ball 27 is in contact with the inner peripheral portion of the mounting hole 28 and is restricted from moving in the axial direction, and can move integrally with the covering member 22 in the axial direction. Further, since the engaging ball 27 is movable in the mounting hole 28, it is movable with respect to the covering member 22 in the radial direction.

  As shown in FIG. 5, the movable member 23 has a protruding position (see FIG. 5A) that protrudes toward the distal end side of the plug with respect to the covering member 22 that is positioned in the covering position in the axial direction, and a plug base end that is more than the protruding position. The inner peripheral part of the cylindrical housing 21 and the outer peripheral part of the covering member 22 are slidably provided in the axial direction at the retreat position where the side member is retracted. Here, the retraction position is a position within a range in which the movable member 23 can move to the plug base end side with respect to the projecting position. For example, the retreat position is a covering member that is located at the plug distal end side of the movable member 23 and the covering position. The position of the movable member 23 at which the plug distal end side 22 is substantially in the same position in the axial direction (see FIG. 5B), the plug distal end side of the movable member 23 and the plug proximal side of the covering position. The position of the movable member 23 (see FIG. 6A) at which the plug tip side end portion of the moved covering member 22 becomes substantially the same position in the axial direction, and the plug tip side end portion of the movable member 23 are at the exposed position. This includes the position of the movable member 23 (see FIG. 6B) that is retracted to the plug base end side from the plug tip side end portion of the covering member 22 that is positioned.

  The fourth coil spring 25 urges the movable member 23 toward the protruding position in the axial direction (upward in the vertical direction in FIGS. 5 and 6). The plug tip side end portion 23 a in the axial direction of the movable member 23 is configured to be able to contact a contact portion 21 a that protrudes toward the inner diameter side provided at the inner peripheral portion of the cylindrical housing 21. The movable member 23 is prevented from moving beyond the protruding position to the plug tip side by the contact between the plug tip side end portion 23a and the contact portion 21a. Further, the stepped portion 23 b provided in the inner diameter side intermediate portion of the movable member 23 in the axial direction (the portion closer to the plug base end than the engagement regulating surface 29) It is configured to be able to contact the bulging portion 22b. The movement of the movable member 23 toward the plug base end with respect to the covering member 22 is restricted by the contact between the stepped portion 23b and the outer diameter side bulged portion 22b.

  On the inner diameter surface of the movable member 23, an engagement restricting surface 29 for restricting the position of the engagement ball 27 in the radial direction to the engagement inner diameter side position for engaging the engagement ball 27 with the lock groove portion 16, and an axial direction. The position of the engagement ball 27 in the radial direction is set to the outer diameter side for disengagement that is provided on the plug tip side of the engagement restricting surface 29 and can disengage the engagement ball 27 from the lock groove portion 16. A restriction surface 30 for releasing the engagement is provided. The engagement restriction surface 29 is on the inner diameter side, and the engagement release restriction surface 30 is on the outer diameter side.

  The movable member 23 is located at the projecting position, and the engagement restriction surface 29 restricts the radial movement of the engagement ball 27 and engages the lock ball 16 with the engagement ball 27 (FIG. 5A). And a disengagement state in which the engagement ball 27 can be disengaged from the lock groove portion 16 by restricting the radial movement of the engagement ball 27 by the disengagement restriction surface 30 at the retraction position. (Refer to FIG. 5 (b), FIG. 6 (a), and FIG. 6 (b)).

  The inner diameter of the movable member 23, that is, the inner diameter of the portion protruding from the covering member 22 located at the covering position (the plug tip side end portion 23a in the movable member 23) is configured to be larger than the outer diameter of the hose 2 (see FIG. 7). ) The size of the movable member 23 in the radial direction is configured such that the sleeve member 7 of the joint member 1 and the movable member 23 can come into contact when the joint member 1 is connected to the plug 3. (See FIG. 5). That is, the plug tip side end portion 23a of the movable member 23 has a facing surface facing in the axial direction, and the sleeve member 7 faces the plug tip side end portion 23a of the movable member 23 facing in the axial direction. It has a surface. Therefore, the inner diameter of the portion of the movable member 23 that protrudes from the covering member 22 located at the covering position allows the opposing surface of the plug tip end portion 23a of the movable member 23 and the opposing surface of the sleeve member 7 to contact each other. It is a size. Thus, when connecting the joint member 1 to the plug 3, the plug 3 enters the cylindrical body 5 of the joint member 1, so that the opposing surfaces of the sleeve member 7 and the movable member 23 come into contact with each other. The movable member 23 can be pressed by the member 7 toward the plug base end side in the axial direction. On the other hand, since the inner diameter of the movable member 23 is larger than the outer diameter of the hose 2, even if the hose 2 is directly connected to the plug 3, the hose 2 and the movable member 23 do not come into contact with each other, and the hose 2 can move the movable member 23. 23 cannot be pushed to the plug base end side in the axial direction.

(Fitting member connection operation)
Based on FIG.5 and FIG.6, each state of the misconnection prevention apparatus 20 in the coupling member connection operation when connecting the coupling member 1 to the plug 3 is demonstrated.

  Fig.5 (a) has shown the initial state of joint member connection operation. At this time, in the erroneous connection preventing device 20, the covering member 22 is positioned at the covering position by the urging force of the third coil spring 24. Further, the movable member 23 is positioned at the protruding position by the urging force of the fourth coil spring 25 and switched to the engaged state. The engagement restricting surface 29 restricts the radial movement of the engagement ball 27 and the engagement ball 27 and the lock groove 16 are engaged. Thereby, the position of the covering member 22 is held at the covering position.

  The operator first positions the joint member 1 at a position away from the plug 3 in the axial direction, and then moves the joint member 1 to the plug base end side (lower side in the figure) in the axial direction. The cylindrical housing 21 of the erroneous connection preventing device 20 has a shape that protrudes more toward the plug tip side than the movable member 23 located at the protruding position in the axial direction at the outer peripheral portion of the movable member 23, and the periphery of the movable member 23. It is formed in a shape that covers the entire circumference of the direction. The inner diameter of the protruding portion that protrudes from the movable member 23 located at the protruding position in the cylindrical housing 21 is configured to be the same as or slightly larger than the outer diameter of the sleeve member 7 of the joint member 1. Thus, when the joint member 1 is moved to the plug base end side, the outer peripheral portion of the sleeve member 7 can be brought into contact with and guided by the inner peripheral portion of the cylindrical housing 21. Therefore, the central axis of the plug 3 and the central axis of the joint member 1 are moved by moving the joint member 1 to the plug base end side in a state where the outer peripheral part of the sleeve member 7 is guided by the inner peripheral part of the cylindrical housing 21. The plug 3 can be easily inserted into the cylindrical main body 5 of the joint member 1 in a state where these are combined.

  FIG.5 (b) shows the next state of Fig.5 (a) in joint member connection operation. When the joint member 1 enters the cylindrical main body 5, the inner diameter of the portion of the movable member 23 that protrudes from the covering member 22 located at the covering position is such that the opposing surface of the plug distal end 23 a of the movable member 23 and the sleeve The sleeve 7 of the joint member 1 has such a size that it can come into contact with the opposing surface of the member 7 and the movable member 23 in which the plug 3 is located at the protruding position protrudes more toward the plug tip side than the covering member 22. 7 and the movable member 23 of the erroneous connection preventing device 20 are in contact with each other only, and the sleeve member 7 pushes the movable member 23 toward the plug base end side. Thus, at the initial stage when the joint member 1 is moved to the plug base end side, only the movable member 23 is moved to the plug base end side by simply contacting the opposing surfaces of the sleeve member 7 and the movable member 23. Then, the movement of only the movable member 23 is continued until the plug tip side end portion 23a of the movable member 23 and the plug tip side end portion 22c of the covering member 22 are substantially in the same position in the axial direction. As a result, the movable member 23 is moved from the protruding position to the retracted position and switched to the disengaged state, and the movement of the movable member 23 restricts the radial movement of the diameter-matching ball 27. The engagement restricting surface 29 is changed to the disengagement restricting surface 30 on the outer diameter side, and the engaging ball 27 can be moved radially outward.

  Fig.6 (a) shows the next state of FIG.5 (b) in joint member connection operation. Since the joint member 1 is moved to the plug proximal end side in a state where the plug distal end portion 23a of the movable member 23 and the plug distal end portion 22c of the covering member 22 are substantially in the same axial position, the sleeve member 7 and the movable member 23 come into contact with each other, and the distal end member 10 and the covering member 22 come into contact with each other, so that not only the movable member 23 but also the covering member 22 is pressed toward the plug base end side. At this time, by pressing the covering member 22 toward the plug base end side, the engagement balls 27 are also pressed toward the plug base end side. Here, as described above, since the engagement release restriction surface 30 restricts the radial movement of the engagement ball 27, the engagement ball 27 is moved from the engagement inner diameter side position to the engagement outer diameter side. It moves to the position and is detached from the lock groove 16. Therefore, the movement of the covering member 22 located at the covering position to the plug base end side is allowed, and the movement of the covering member 22 from the covering position toward the exposed position is started.

FIG. 6B shows the next state of FIG. 6A in the joint member connection operation.
When the joint member 1 is further moved to the plug base end side, the lock ball 8 of the joint member 1 reaches the position where the lock groove portion 16 is disposed in the axial direction, and the lock ball 8 is fitted into the lock groove portion 16. . Thereby, the position holding of the sleeve member 7 is released, and the sleeve member 7 projects toward the plug base end side. Due to the protrusion of the sleeve member 7, the movable member 22 is pressed to the plug base end side, and only the movable member 22 moves to the plug base end side. The radial movement of the locking ball 8 is restricted by the second restriction surface 7 b of the sleeve member 7, and the state in which the locking ball 8 is fitted in the lock groove portion 16 is maintained, and the joint member 1 is attached to the plug 3. The connected state is established.

[Hose direct connection operation]
Based on FIG. 7, the erroneous connection preventing device 20 in the hose direct connection operation when the joint member 1 is directly connected to the hose 2 will be described. FIG. 7 is a cross-sectional view of the misconnection prevention device 20, the plug 3, and the joint member 1 in the same manner as in FIGS. 5 and 6, and shows the axial direction, the radial direction, the plug tip side in the axial direction, and the axial direction. The plug base end side is also in the same direction as in FIGS. 5 and 6.

  Even if the operator moves the hose 2 in the axial direction to the plug base end side (lower side in the figure) and tries to connect the hose 2 directly to the plug 3, the inner diameter of the movable member 23 is larger than the outer diameter of the hose 2. Since the hose 2 and the movable member 23 do not come into contact with each other, the hose 2 cannot press the movable member 23 toward the plug base end side in the axial direction. Thereby, in the erroneous connection preventing device 20, the covering member 22 is positioned at the covering position by the urging force of the third coil spring 24. Further, the movable member 23 is positioned at the protruding position by the urging force of the fourth coil spring 25 and switched to the engaged state. The engagement restricting surface 29 restricts the radial movement of the engagement ball 27 and the engagement ball 27 and the lock groove 16 are engaged, and the position of the covering member 22 is held at the covering position. Therefore, the covering member 22 located at the covering position covers each of the second annular portion 17, the lock groove portion 16, and the first annular portion 15 from the distal end portion of the connecting portion 13 in the axial direction, and the hose. 2 can be prevented from being directly connected to the connecting portion 13.

(Separated configuration)
Based on FIG.5 and FIG.6, the isolation | separation structure which cancels | releases the connection and separates the coupling member 1 from the plug 3 from the connection state in which the coupling member 1 was connected to the plug 3 is demonstrated.

  The erroneous connection prevention device 20 includes a connection release member 31 that releases the connection of the joint member 1 to the plug 3 by a movement operation in the axial direction in a connected state in which the joint member 1 is connected to the plug 3. The connection release member 31 is configured to be able to release the connection of the joint member 1 to the plug 3 by pressing the plug proximal end 23c of the movable member 23 by a movement operation in the axial direction.

  The connection release member 31 includes an internal contact portion 31 a that can freely contact the plug proximal end 23 a of the movable member 23 in the inner peripheral portion of the cylindrical housing 21 and an axial direction in the outer peripheral portion of the cylindrical housing 21. An external operation unit 31b that can be moved and operated is provided. As shown in FIG. 4, the external operation portion 31 b is formed in a cylindrical shape that can slide freely on the outer peripheral portion of the cylindrical housing 21, and the internal contact portion 31 a is also formed in a cylindrical shape. And the external operation part 31b and the internal contact part 31a are connected by the connection part 31c provided in multiple numbers (for example, three) at intervals in the circumferential direction (refer FIG. 4). Thereby, the external operation part 31b and the inscribed contact part 31a are integrally movable in the axial direction, and the internal contact part 31a is moved by the moving operation in the axial direction of the external operation part 31b. It is configured to be able to be pressed by being brought into contact with the plug proximal end 23c.

  A fourth coil spring 25 is disposed between the inner contact portion 31 a and the movable member 23 in the axial direction at the inner peripheral portion of the cylindrical housing 21. The connection release member 31 is biased to a position where it abuts on the proximal end portion of the plug 3 in the axial direction by the biasing force of the fourth coil spring 25 (see FIGS. 5 and 6). That is, the connection release member 31 is restricted from moving toward the plug proximal end in the axial direction by abutting against the proximal end of the plug 3.

(Separation operation)
Based on FIG. 8, a separation operation for releasing the connection and separating the joint member 1 from the plug 3 from the connection state in which the joint member 1 is connected to the plug 3 will be described. FIG. 8 is a cross-sectional view of the misconnection prevention device 20, the plug 3, and the joint member 1 in the same manner as in FIGS. 5 and 6, and shows the axial direction, the radial direction, the plug tip side in the axial direction, and the axial direction. The plug base end side is also in the same direction as in FIGS. 5 and 6.

  FIG. 8A shows an initial state of the separation operation. The operator moves the external release portion 31b to the plug distal end side and moves the connection release member 31 to the plug distal end side from the position where the connection release member 31 contacts the proximal end portion of the plug 3 in the axial direction. As a result, the inner contact portion 31a is brought into contact with the plug proximal end 23c of the movable member 23 and is pressed toward the plug distal end to move the movable member 23 toward the plug distal end. By the movement of the movable member 23, the sleeve member 7 is pressed toward the plug tip side and moved to the plug tip side. Therefore, the first restricting surface 7a comes to a position facing the locking ball 8 in the radial direction, and the locking ball 8 can move radially outward.

  FIG. 8B shows the next state of FIG. 8A in the separation operation. As described above, the first restricting surface 7 a is located at a position facing the locking ball 8 in the radial direction, and the locking ball 8 moves radially outward to lock the locking ball 8 and the lock groove portion 16. Is released to release the connection of the joint member 1 to the plug 3. And the joint member 1 can be isolate | separated from the plug 3 when an operator moves the joint member 1 to the plug front end side (refer Fig.5 (a)). In the erroneous connection preventing device 20, the movable member 23 is positioned at the projecting position, and the covering member 22 is held at the covering position by the engagement between the engagement ball 27 and the lock groove portion 16.

[Second Embodiment]
This second embodiment shows another embodiment of the engaging portion 26 in the first embodiment, and the other configuration is the same as that of the first embodiment, so that it is shown in FIGS. 9 to 13. As described above, the configuration of the engaging portion 26 will be mainly described, and description of other configurations will be omitted. FIG. 9 is an exploded perspective view of the erroneous connection preventing device 20. 10 to 13 are cross-sectional views of the erroneous connection preventing device 20, the plug 3, and the joint member 1, respectively. 10 and 11 show the respective states when the joint member 1 is connected to the plug 3 on which the erroneous connection preventing device 20 is mounted. FIG. 12 shows a state when the hose 2 is directly connected to the plug 3 fitted with the erroneous connection prevention device 20. FIG. 13 shows a state where the joint member 1 is connected to the plug 3. Each state when releasing the connection and separating the joint member 1 from the plug 3 is shown.

  In the following description, the axial direction is the vertical direction in FIGS. 10 to 13, and the radial direction is the horizontal direction in FIGS. 10 to 13. Moreover, the plug distal end side in the axial direction is the upper side in the vertical direction in FIGS. 10 to 13, and the plug proximal end side in the axial direction is the lower side in the vertical direction in FIGS. 10 to 13.

  As shown in FIG. 9, the covering member 22 provided with the engaging portion 26 described in the first embodiment includes a swinging portion 32 that extends in the axial direction and is swingable in the radial direction. . A plurality (for example, two) of the swinging portions 32 are provided at intervals in the circumferential direction of the covering member 22. For example, when the two swinging portions 32 are provided, the disposition positions thereof are disposed at symmetrical positions in the radial direction of the covering member 22. An inner bulging portion 33 (corresponding to a bulging portion) that bulges toward the radially inner diameter side is provided as an engaging portion 26 at the distal end portion of the oscillating portion 32. In addition, an outer bulging portion 34 that bulges radially outward is provided at the outer peripheral portion of the swinging portion 32. The inner bulge portion 33 is formed in a shape that can be engaged with the lock groove portion 16. The outer bulging portion 34 is configured to be able to come into contact with the engagement restriction surface 29 and the engagement release restriction surface 30 of the inner diameter surface of the movable member 22, and the radial movement is restricted by the contact. Therefore, the covering member 22 is switched to the engaged state by engaging the inner bulged portion 33 with the lock groove portion 16 by restricting the radial movement of the outer bulged portion 34 by the engagement regulating surface 29. When the radial movement of the outer bulging portion 34 is restricted by the engagement release regulating surface 30, the engagement of the inner bulging portion 33 with the lock groove portion 16 is released, and the engagement is released.

(Fitting member connection operation)
The joint member connecting operation will be described. First, as shown in FIG. 10A, the radial movement of the outer bulging portion 34 of the swinging portion 32 is restricted by the engagement regulating surface 29, and the inner bulging is performed. The portion 33 is engaged with the lock groove portion 16. Then, as shown in FIG. 10B, at the initial stage when the plug 3 is moved into the cylindrical body 5 of the joint member 1 and the joint member 1 is moved to the plug base end side, the movable member 23 is retracted from the protruding position. The movement of the movable member 23 restricts the radial movement of the outer bulging portion 34 of the swinging portion 32 from the engagement regulating surface 29 on the inner diameter side to the engagement release regulation on the outer diameter side. It changes to the surface 30 and the rocking | swiveling part 32 can rock | fluctuate to the radial direction outer-diameter side.

  As shown in FIG. 11A, by further moving the joint member 1 to the plug base end side, in addition to the movable member 22, the covering member 22 is also pressed to the plug base end side, and the swinging portion 32 is moved. The inner bulged portion 33 is detached from the lock groove portion 16 by swinging toward the radially outer diameter side. Thereby, the movement of the covering member 22 from the covering position to the exposed position is started. Then, by further moving the joint member 1 to the plug base end side, as shown in FIG. 11 (b), the locking ball 8 is fitted into the lock groove portion 16, and the joint member 1 is connected to the plug 3. Connected.

[Hose direct connection operation]
As in FIG. 12 in the first embodiment, as shown in FIG. 12, the operator moves the hose 2 in the axial direction to the plug base end side (lower side in the figure) and directly connects the hose 2 to the plug 3. Even if it is going to be connected, the inner diameter of the movable member 23 is larger than the outer diameter of the hose 2, so that the hose 2 does not contact the movable member 23, and the hose 2 moves the movable member 23 in the axial direction. The plug cannot be pressed to the base end side. Thereby, each of the second annular portion 17, the lock groove portion 16, and the first annular portion 15 is covered from the distal end portion of the connecting portion 13 in the axial direction by the covering member 22 located at the covering position. It is possible to prevent the hose 2 from being directly connected to the connecting portion 13.

(Separated configuration)
Similarly to FIG. 8 in the first embodiment, as shown in FIG. 13, the operator moves the external operation portion 31 b from the position where the connection release member 31 contacts the proximal end portion of the plug 3 in the axial direction. The connection release member 31 is moved to the plug distal end side, the inner contact portion 31a is brought into contact with the plug proximal end portion 23c of the movable member 23, and the plug distal end side is pressed to move the movable member. 23 is moved to the plug tip side. As the movable member 23 moves, the sleeve member 7 is pressed to the plug tip side and moved to the plug tip side, and the lock ball 8 moves radially outward to unlock the lock ball 8 and the lock groove 16. Then, the connection of the joint member 1 to the plug 3 is released. And the joint member 1 can be isolate | separated from the plug 3 by an operator moving the joint member 1 to the plug front end side (refer Fig.10 (a)). In the erroneous connection preventing device 20, the movable member 23 is positioned at the protruding position, and the covering member 22 is held at the covering position by the engagement between the inner bulging portion 33 and the lock groove portion 16.

[Another embodiment]
(1) In the first and second embodiments, the connection release member 31 that releases the connection of the joint member 1 to the plug 3 by the movement operation in the axial direction is provided, but the connection release member 31 is not provided. The operator can directly hold the movable member 23 or the sleeve member 7 from the outside of the cylindrical housing 21, and the operator can move the plug in the axial direction by holding the movable member 23 or the sleeve member 7. The connection of the joint member 1 to 3 can also be released.

The configuration in which the operator can directly have the movable member 23 or the sleeve member 7 from the outside of the cylindrical housing 21 is, for example, in a connected state in which the joint member 1 is connected to the plug 3. The cylindrical casing 21 can be provided with an operating groove extending in the axial direction that exposes the outer surface 7 to the outside of the cylindrical casing 21. As a result, the operator can directly hold the movable member 23 or the sleeve member 7 from the outside of the cylindrical housing 21 through the operation groove portion, and the movable member 23 or the sleeve member 7 can be held in the axial direction using the operation groove portion. You can move to.
In addition, for example, the cylindrical housing 21 is configured from a plurality of divided portions arranged at intervals in the circumferential direction, so that the operator can move the movable member from the outside of the cylindrical housing 21 through the gap between the divided portions. 23 or the sleeve member 7 can be directly provided, and the movable member 23 or the sleeve member 7 can be moved in the axial direction by utilizing the gap between the divided portions.

  INDUSTRIAL APPLICABILITY The present invention can be employed in a hose connection structure for connecting a joint member to a plug. This can be prevented with respect to the direct connection of the hose to the plug, and various types that can be satisfactorily performed with respect to the connection of the joint member to the plug. It can be applied to the erroneous connection prevention device.

DESCRIPTION OF SYMBOLS 1 Joint member 2 Hose 3 Plug 4 Connector 5 Cylindrical main body 6 Actuating member 7 Sleeve member 7a 1st control surface 7b 2nd control surface 8 Locking ball 13 Connection part 15 1st ring part 16 Lock groove part 17 2nd ring part 20 Incorrect connection prevention device 21 Cylindrical housing 22 Cover member 23 Movable member 24 First biasing means (third coil spring)
25 Second urging means (fourth coil spring)
26 engaging portion 27 engaging ball 29 engaging restricting surface 30 disengaging restricting surface 31 connection releasing member 31a internal contact portion 31b external operation portion 32 swinging portion 33 bulging portion (inner bulging portion)

Claims (9)

A plug provided with a connector to which a connector to which a hose is connected, a sleeve member movable in the axial direction, and a coupling member having a locking ball are connected is provided with an internal fluid extending from the distal end to the proximal end in the axial direction. A flow path is provided, a first annular portion, a lock groove portion for receiving the locking ball, and a second annular portion are provided from the proximal end to the distal end side of the connection portion, and the joint member is connected to the plug. A misconnection prevention device used for the hose connection structure
The cylindrical housing that can be attached to the plug includes a covering position that covers the first annular portion, the lock groove portion, and the second annular portion at an outer peripheral portion of the connection portion, the first annular portion, and the lock groove portion. and a freely covering member moves axially and exposing position for exposing the second annular portion, the plug front end side than the front Symbol the covering member located in said covering position in the axial direction at the outer peripheral portion of the cover member A movable member that is movable in the axial direction between a protruding position that protrudes and a retracted position that retracts toward the plug base end side relative to the protruding position, and a first bias that biases the covering member toward the covering position in the axial direction Means, and a second urging means for urging the movable member in the axial direction toward the protruding position,
The covering member includes an engaging portion that is radially engageable with the lock groove portion by restricting a radial position of the cylindrical housing on an inner diameter surface of the movable member, and the engagement member and the lock groove portion The position in the axial direction is configured to be freely held at the covering position by engagement,
The movable member is engaged with the lock groove portion by restricting the engagement portion to the engagement inner diameter side position in the radial direction by an engagement restriction surface provided on the inner diameter surface at the protruding position. The engagement portion is engaged in the radial direction by an engagement state to be engaged and a disengagement restricting surface provided on the inner diameter surface of the plug tip side relative to the engagement restricting surface in the axial direction at the retracted position. It is configured to be switchable to an engagement release state in which the engagement of the engagement portion with respect to the lock groove portion can be released by restricting the position to the outer diameter side for release.
The inner diameter of the movable member is configured to be larger than the outer diameter of the hose, and the size of the movable member in the radial direction is such that the sleeve member and the movable member are connected when the joint member is connected to the plug. An erroneous connection prevention device configured to be a size capable of contacting.
  The erroneous connection preventing device according to claim 1, wherein the covering member is provided with a plurality of the engaging portions at intervals in a circumferential direction of the connecting portion.   The covering member includes an engaging ball supported as the engaging portion so as to be movable integrally with the covering member in an axial direction and movably with respect to the covering member in a radial direction. Item 3. An erroneous connection prevention device according to item 1 or 2.   The covering member is provided with a swinging portion that extends in the axial direction and is swingable in the radial direction. As the engaging portion, a bulge that bulges toward the radially inner diameter side at an inner peripheral portion of the swinging portion. The erroneous connection preventing device according to claim 1 or 2, wherein a portion is provided.   The cylindrical housing has a shape projecting toward the plug tip side from the movable member positioned at the projecting position in the axial direction at the outer peripheral portion of the movable member, and on the entire circumference in the circumferential direction of the movable member. The erroneous connection preventing apparatus according to any one of claims 1 to 4, wherein the erroneous connection preventing apparatus is formed in a shape covering the entire area. The covering member is formed in a circular cylindrical shape covering the entire circumference in the circumferential direction of the columnar connection portion,
The erroneous connection preventing device according to any one of claims 1 to 5, wherein the movable member is formed in a circular cylindrical shape covering the entire circumference of the covering member in the circumferential direction.   In the connected state in which the joint member is connected to the plug, a connection release member that releases the connection of the joint member to the plug by a movement operation in the axial direction is provided, and the connection release member moves in the axial direction. The erroneous connection prevention according to any one of claims 1 to 6, wherein the connecting member is configured to be freely disconnected by pressing a plug proximal end of the movable member by an operation. apparatus.   The connection release member is operated to move in an axial direction at an inner contact portion that can freely contact a plug proximal end of the movable member at an inner peripheral portion of the cylindrical housing and an outer peripheral portion of the cylindrical housing. A movable external operation unit, and is configured to be able to be pressed by bringing the internal contact portion into contact with the plug proximal end of the movable member by moving the external operation unit in the axial direction. The erroneous connection preventing apparatus according to claim 7.   The second urging means is disposed between the internal abutment portion of the connection release member and the movable member in the axial direction, and the connection release member is moved in the axial direction by the urging force of the second urging means. The erroneous connection preventing device according to claim 8, wherein the device is biased to a position in contact with a proximal end portion of the plug.

Images