JP2758380B2 - Connector for female screw port of hydraulic equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connector for connecting to a female screw port provided in a hydraulic device.

[0002]

2. Description of the Related Art Conventionally, as a connector for connecting to a female screw port P provided in a fluid pressure device F, FIGS.
The following are known. This is cylinder case 2
An arm 3 having a thread 4 engageable with the female screw portion S of the female screw port P is protruded from the front end of the cylinder case 2, and a handle 5 for displacing the arm 3 to close inward is provided on the outer periphery of the cylinder case 2. The arm 3 is urged in the expanding direction by a spring (not shown) in the cylinder case 2.

[0003] When attaching the connecting device 1 to the female screw port P, the arm 3 is closed by grasping the handle 5 as shown in FIG. Then, as shown in FIG. 10, the arm 3 is released by releasing the grip of the handle 5.
Is opened to engage the screw thread 4 with the female screw portion S of the female screw port P.

[0004]

In the above-described conventional connector 1, the connector 1 is moved forward to insert the arm 3 into the female screw port P while holding the handle 5 to close the arm 3. The mounting is performed by two operations of pressing against the mounting surface. However, while the operation of gripping the handle 5 applies a radial force to the connector 1, the operation of pressing the connector 1 forward applies an axial force to the connector 1. Attempting to perform two operations with different ways of applying force at the same time tends to cause a disorder in the hand, which leads to a decrease in operability.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a connecting tool which is excellent in operability when mounting to a female screw port.

[0006]

According to a first aspect of the present invention, there is provided a cylinder case in which a hose can be connected and a fluid flow path is provided at an open front end face. A plurality of arms which are arranged in the circumferential direction and are displaceable in the radial direction and are provided with engaging portions on the outer periphery of the protruding portion from the front end surface of the cylinder case,
After the engaging portion is inserted into the female screw port of the fluid pressure device with the arm converged, the arm is expanded to engage the engaging portion with the female screw portion on the inner periphery of the female screw port. By being connected to the fluid pressure device, an arm urging means for urging the arm in a converging direction, and provided in the cylinder case so as to be able to advance and retreat in the front-rear direction, displaced in the front direction, and A center shaft that expands and displaces the arm by entering while engaging between a plurality of arms, and a center shaft that advances between the arms and expands and displaces the arm is locked in a retraction restricted state. And locking means capable of unlocking the center shaft.

According to a second aspect of the present invention, in the first aspect of the present invention, a pressing surface orthogonal to the advancing and retreating direction of the center shaft is provided at a rear end portion of the center shaft so as to protrude rearward of the cylinder case. It is characterized by

[0008] The invention of claim 3 is claim 1 or claim 2.
In the invention, the lock means is a lock member that can be displaced in the radial direction between a position where the center shaft that has entered between the plurality of arms is engaged in the backward restriction state and a position where the engagement is released. And an operation cylinder fitted on the outer periphery of the cylinder case so as to be displaceable in the front-rear direction, and the inner peripheral surface of the operation cylinder is brought into a state of engagement with the center shaft by the rearward displacement of the operation cylinder. It is characterized in that the engagement with the center shaft of the lock member can be released by holding the holding cylinder and displacing the operating cylinder forward.

The invention according to claim 4 is the invention according to claims 1 to 3.
The present invention is characterized in that the arm is supported by a support shaft that is eccentric and intersects with the axis of the cylinder case at its rear end.

According to a fifth aspect of the present invention, in the fourth aspect of the present invention, a seal ring is provided at the front end of the cylinder case so as to surround the arm and can be in close contact with an opening peripheral portion of the female screw port in the fluid pressure device. A compression coil spring for urging the seal ring forward toward the fluid pressure device side, and the compression coil spring presses rearward a position closer to the axis of the cylinder case than the support shaft of the arm. This is characterized in that the structure is also used as the urging means for the arm.

The invention of claim 6 is the first to fifth aspects of the present invention.
In the invention of (1), a communication hole that communicates the internal flow path and the outer peripheral surface is formed in the cylinder case, and a flow space is provided on the outer circumference of the cylinder case over the entire circumference including the communication hole. A connection tube that covers and is rotatable while maintaining airtightness in the circulation space is mounted.
The present invention is characterized in that a relay port which is connected to the circulation space and to which a hose can be attached and detached is formed.

[0012]

According to the first aspect of the present invention, when the center shaft is retracted, the arms are brought into a converging state. By moving the cylinder case forward in this state, the engaging portion is inserted into the female screw port, and the center shaft is further displaced forward. Then, the arm is expanded and displaced, the engaging portion engages with the female screw portion of the female screw port, and the center shaft is locked by the locking means, so that the engaging portion and the female screw portion are held in the engaged state. The connection with the fluid pressure device is completed. At the time of removal, the lock of the center shaft by the locking means is released, and the center shaft is retracted. Then, the arm is brought into a converging state and the engagement between the engaging portion and the female screw portion is released. Therefore, the cylinder case may be moved rearward to remove the arm from the female screw port.

According to the second aspect of the present invention, the operation of displacing the center shaft forward when connecting to the hydraulic device is as follows.
This is performed by the operator pressing his hand against the pressing surface and pressing this forward.

According to the third aspect of the present invention, at the time of connection,
When the center shaft enters between the arms and the arm and the female screw are fitted, the locking member engages with the center shaft and retreat is restricted, so that the arm and the female screw are locked in the fitted state. At the time of removal, when the operation member is displaced forward, the engagement of the lock member with the center shaft is released, and by retracting the center shaft from this state, the arm is brought into a converged state and pulled out from the port.

According to the fourth aspect of the present invention, the arm is displaced in the radial direction about the support shaft between a converging posture near the axis of the cylinder case and an expanding posture away from the axis.

In the fifth aspect of the present invention, the seal between the connector and the fluid pressure device is sealed by pressing the seal ring against the periphery of the opening of the female screw port by the compression coil spring. In addition, the compression coil spring serves as both the urging means for the seal ring and the urging means for the arm, and the arm is urged in the converging direction by the compression coil spring.

In the sixth aspect of the present invention, when a hose is connected to the connection port, the fluid that has passed through the hose flows into the port of the fluid pressure device through the relay port, the circulation space, and the flow path.

[0018]

According to the first aspect of the present invention, when mounting to the female screw port, the operation of bringing the entire connector closer to the hydraulic device and the operation of displacing the center shaft with respect to the cylinder case are performed. However, since both operation directions are the same front direction, the operability is excellent.

According to the second aspect of the present invention, the operation of the center shaft is performed not by grasping the center shaft from the outer peripheral side but by pushing the center shaft from the rear. The center shaft can be reliably operated even when it is used in a state in which it becomes slippery due to adhesion of the center shaft.

According to the third aspect of the present invention, when detaching, the operation member is pushed forward while grasping the operation member. Can exert a strong grip. Therefore, even when the operation member becomes slippery due to adhesion of oil or the like, the operation can be reliably performed.

According to the fourth aspect of the present invention, since the arm is supported by the support shaft, there is no backlash in the circumferential direction, and a stable posture can be maintained. Therefore, the fitting with the female screw port can be reliably performed.

According to the fifth aspect of the present invention, since a common compression coil spring is used as the urging means for the seal ring and the arm, the structure is different from the case where each urging means is separately provided. Thus, the number of parts can be reduced, and cost reduction and overall size reduction can be achieved.

According to the invention of claim 6, since the connecting cylinder to which the hose is connected is rotatable with respect to the cylinder case, handling of the hose is easy.

[0024]

【Example】

<Embodiment 1> Hereinafter, Embodiment 1 embodying the present invention will be described with reference to FIG.
This will be described with reference to FIGS. Connector 10 of the present embodiment
Is a cylinder case 1 having a length extending over substantially the entire length thereof.
1, an arm 17 provided at the front end of the cylinder case 11, and a center shaft 25 fitted into the hollow of the cylinder case 11.

The cylinder case 11 includes a front cylinder 12 and a rear cylinder 13 and is assembled by screwing a female screw 12A on the inner periphery of the rear part of the front cylinder 12 and a male screw 13A on the outer periphery of the front end of the rear cylinder 13. I have. An arm base 14 is provided on the inner periphery of the rear end of the front cylinder 12 with a male screw 14A on the outer periphery of the rear end.
Is screwed into a female screw 12B on the inner periphery of the front cylinder 12.

As shown in FIG. 3, the rear portion of the arm base 14 is formed in a cylindrical shape concentric with the cylinder case 11 and penetrates forward and backward, and the front portion of the arm base 14 reaches the outer periphery through the center thereof. Mounting groove (vertical groove in the figure)
15 are formed. The arm base 14 is formed with shaft fitting holes 14B, 14B at two positions deviated from the axis of the arm base in both up and down directions in the figure.
Support shafts 16, 16 whose axes are directed in the left-right direction, are attached to 14 </ b> B so as to cross the attachment grooves 15, 15. Each of the two support shafts 16 and 16 has an arm 1
7 is supported so as to be able to swing up and down.

The arms 17, 17 are elongated in the front-rear direction as a whole, and their rear ends are bent outward (upward in the upper arm 17 and downward in the lower arm 17). Has a symmetrical shape in the vertical direction with respect to the axis of. The shaft hole 17B formed at the bent end of the rear end portion is fitted to the support shaft 16, whereby the arm 17 is connected to the cylinder case 11
(Hereinafter, referred to as a widening posture) and a posture (hereinafter, referred to as a convergence posture) in which the front end portion is displaced toward the axis of the cylinder case 11 and tilted (hereinafter, referred to as a converging posture). I have. Further, the width of the arm 17 is the same as the width of the mounting groove 15 of the arm base 14, thereby preventing the arm 17 from rattling in the left-right direction (the axial direction of the support shaft 16). .

The front end of the arm 17 is
Projecting forward from the front end of the cylinder case 11, and the outer periphery of the front end forms an arc surface concentric with the cylinder case 11 in the expanded position. An engaging portion 18 formed of a helical thread formed by a part of a male screw is formed on the circular arc surface. The internal thread portion S formed on the inner periphery of the internal thread port P of the pressure device F can be engaged. The arm 17 is biased in the convergence direction, and the biasing means will be described later.

In the front cylinder 12, a cylindrical seal holder 20 is fitted with an O-ring fitted on the outer periphery thereof so as to keep the inner space of the front cylinder 12 airtight. The seal holder 20 moves in the front-rear direction between a retracted position where its rear end surface contacts the rear end surface 12 </ b> C of the front cylinder 12 and a projecting position where it contacts a stopper ring 21 fitted on the inner periphery of the front cylinder 12. It is possible. An annular rubber seal ring 22 arranged to surround the arm 17 is fitted around the inner periphery of the front end of the seal holder 20. The seal ring 22 protrudes from the front end surface of the cylinder case 11 even in the most retracted state, and is pressed against the peripheral edge of the opening of the female screw port P of the fluid pressure device F, thereby making the fluid pressure device F And the connector 10 is sealed.

The seal holder 20 has a spring receiving surface 20A projecting from the inner periphery thereof and facing rearward.
A spring receiving surface 17 </ b> A facing forward is formed at a position closer to the axis of the cylinder case 11 than the support shaft 16 at the bent portion of the arm 17 to the outside of the rear end. Between the two spring receiving surfaces 17A and 20A, an arm urging compression coil spring (arm urging means which is a constituent element of the present invention) 23 is attached so as to surround the outer periphery of the arm 17. The arm biasing compression coil spring 23 biases the arm 17 in the converging direction and simultaneously biases the seal holder 20 forward.

The inner surfaces of the arms 17, 17 facing each other are concentric with the cylinder case 11 in the expanded position, and have the same diameter as a lock pin 26 of a center shaft 25 described later in the expanded position. It has an arc surface. A lock pin 26 is provided between the arms 17 and 17.
Is inserted, the arms 17, 17 are pushed outward by the engagement of the outer peripheral surface thereof with the arcuate surface of the arm 17, so that the arms 17, 17 are held in the expanded position.

The center shaft 25 has a lock pin 26 at the front end and has a length that extends over substantially the entire length of the cylinder case 11, and can be moved in the front-rear direction by being guided by the inner periphery of the rear cylinder 13. Has become. An O-ring 27 is fitted around the outer periphery of the center shaft 25, and between the outer periphery of the center shaft 25 and the inner periphery of the rear cylinder 13, a portion between a region in front of the O-ring 27 and a region behind the O-ring 27 is provided. It is in a state where airtightness is maintained.

The cylinder case 11 of the center shaft 25
A thick plate 28 is attached to a rear end surface protruding from the movable member by bolts 29 so as to be integrally movable. The rear end surface of the plate 29 is a flat pressing surface 30 orthogonal to the moving direction of the center shaft 25. A cylindrical holder 33 is fixedly attached to the outer periphery of the rear end of the rear cylinder 13 by using a stopper ring 31 and a collar 32. A longitudinally central portion of the holder 33 has a shape bent in a crank shape in a longitudinal section, and a portion facing the rear of the crank-shaped bent portion is a spring receiving surface 33A. Meanwhile, plate 2
The peripheral edge of the front end surface of 9 is also a spring receiving surface 29A, and a center shaft spring 34 composed of a compression coil spring is mounted between the two spring receiving surfaces 29A and 33A. The center shaft 25 is urged rearward by the center shaft spring 34.

The outer periphery of the rear end of the center shaft 25 is a reduced diameter portion 35 having a diameter slightly smaller than the inner periphery of the rear cylinder 13, and the front end of the reduced diameter portion 35 has a tapered surface 36.
It has become. On the other hand, a stopper 37 having the same diameter as the reduced diameter portion 35 is formed at the rear end of the inner circumference of the rear cylinder 13. When the center shaft 25 moves rearward relative to the cylinder case 11, further retraction of the center shaft 25 is restricted when the tapered surface 36 of the reduced diameter portion 35 contacts the stopper 37. ing. As a result, the rearmost position of the center shaft 25 is set, and the center shaft 25 is always held at the rearmost position by the urging of the center shaft spring 34. When the center shaft 25 is at the rearmost position, the front end of the lock pin 26 slightly enters the rearmost position between the arms 17, 17. The displacement is not hindered.

With the center shaft 25 moving forward and the plate 28 approaching the rear end of the rear cylinder 13, the lock pin 26 enters between the arms 17, 17 deep enough. In this state, at a position corresponding to the tapered surface 36 of the reduced diameter portion 35 of the center shaft 25,
A ball support hole 38 that allows the rear cylinder 13 to penetrate from the inner peripheral surface to the outer peripheral surface is formed at appropriate intervals in the circumferential direction. A lock ball (a lock member, which is a component of the present invention) 39 is accommodated in the ball support hole 38 so as to be movable in the radial direction. The diameter of the lock ball 39 is set slightly larger than the thickness of the rear cylinder 13, and the lock ball 39 always projects from at least one of the inner peripheral surface and the outer peripheral surface of the rear cylinder 13. Then, the lock ball 39 is moved to the rear cylinder 13.
When the lock ball 39 projects to the inner peripheral side of the
Of the center shaft 25 can be engaged with the tapered surface 36 of the center shaft 25. When the lock ball 39 and the tapered surface 36 are engaged, the center shaft 25 is locked in a state where backward movement is restricted.

An operation cylinder 40 is fitted on the outer periphery of the rear cylinder 13 so as to be movable in the front-rear direction while covering the opening area of the ball support hole 38. The operating cylinder 40 constitutes a lock means which is a constituent element of the present invention together with the lock ball 39. The operation cylinder 40 has a spring receiving surface 40A facing forward, and the rear cylinder 13
Spring receiving surface 41A facing rearward is
A locking spring 42 composed of a compression coil spring is mounted between the two spring receiving surfaces 40A and 41A. The operating cylinder 40 is urged rearward by the locking spring 42. When the operating cylinder 40 is most retracted and its rear end surface contacts the stopper 43 formed in the crank-shaped bent portion of the holder 33, the operation cylinder 40 is not operated. The cylinder 40 locks the center shaft 25 in the backward restricted state as described later.

On the inner periphery of the operation cylinder 40, a pressing surface 44 for pressing the lock ball 39 so as not to protrude to the outer surface side of the rear cylinder 13 in the above-mentioned locked state (the state in which it is most retracted and comes into contact with the stopper 43). Is formed. When the pressing surface 44 presses the lock ball 39, the center shaft 25 is locked immovably rearward at the position where the center shaft 25 is displaced forward.

Further, a portion of the inner periphery of the operation cylinder 40 behind the pressing surface 44 is provided with an enlarged diameter portion 4 having a diameter larger than the pressing surface 44.
The boundary between the enlarged diameter portion 45 and the pressing surface 44 is a tapered surface 46. Therefore, when the operating cylinder 40 is moved forward from the locked state against the urging of the locking spring 42, the pressing surface 44
The lock ball 39 is released from the outer peripheral surface of the rear cylinder 13 by the taper surface 36 of the center shaft 25 and is released from the outer peripheral surface of the rear cylinder 13. By the urging of 34, it moves backward. Then, the lock ball 39 is held in a state of protruding from the outer peripheral surface of the rear cylinder 13 by the engagement with the outer peripheral surface of the center shaft 25 that has retreated, and the operating cylinder 4
0 is locked in a state where the tapered surface 46 is engaged with the lock ball 39. In addition, a step portion 47 having a larger diameter at the front end than at the rear end is formed on the outer periphery of the operation cylinder 40 in order to facilitate the pushing operation toward the front.

A connection tube 50 for connecting a hose (not shown) is fitted around the outer periphery of the cylinder case 11. The inner periphery of the connection tube 50 has a small diameter portion 51 whose center is smaller in diameter than the front and rear end portions.
The connection tube 50 is restricted from moving in the front-rear direction with respect to the cylinder case 11 by fitting the front and rear end surfaces of the rear cylinder 13 between the ridge 41 of the rear cylinder 13 and the rear end of the front cylinder 12. . Small diameter part 51 and rear cylinder 1
A flow space 52 is formed around the entire circumference of the rear cylinder 3 by slightly reducing the outer circumference of the rear cylinder 13.

O-rings 53, 53 are provided on the outer periphery of the ridge 51 and the outer periphery of the rear end of the front cylinder 12, respectively.
Are fitted. These O-rings 53 are connected to the connecting cylinder 50.
In contact with the inner circumference of the front and rear ends. The connection cylinder 50 is connected to the cylinder case 11 in a state where the airtightness in the flow space 52 between the small diameter portion 51 and the outer periphery of the cylinder case 11 is maintained.
Can be relatively rotated with respect to.

The small-diameter portion 51 is formed with a relay port 54 which is opened on the outer peripheral surface of the connection cylinder 50 and communicates with the circulation space 52. The relay port 54 has a female screw formed on the inner circumference, and a hose (not shown) is connected by screwing. Since the connection cylinder 50 is rotatable with respect to the cylinder case 11 as described above, it is possible to freely change the direction of the relay port 54 within a range of 360 ° even when the posture of the cylinder case 11 is constant. ing.

From the relay port 54, the cylinder case 1
The flow path of the fluid that reaches the front end face of the first is as follows. In the rear cylinder 13, a communication hole 55 penetrating from the inner periphery to the outer periphery of the rear cylinder 13 is formed at a position further forward than the O-ring 27 when the center shaft 25 is located at the forefront. The communication hole 55 opens at the front end of the circulation space 52. On the outer periphery of the center shaft 25, the diameter of the portion in front of the O-ring 27 is reduced so as to reduce the flow path 5 between the inner periphery of the rear cylinder 13 and the inner periphery of the arm 17 base 14.
6 are formed. The passage 56 is formed by a gap between the arms 17 and 17 and the mounting groove 15,
It communicates with the opening at the front end of the cylinder case 11 through the gap between the arms 7 and 17 and the gap between the arms 17 and 17 and the seal ring 22.

Next, the operation of this embodiment will be described.
The connector 10 of the present embodiment is connected to the female screw port P of the fluid pressure device F.
As shown in FIG. 1, the center shaft 25 projects largely rearward from the cylinder case 11 so that both arms 17, 17 are in a converging posture with their front ends closed. Connect the connecting tool 10 to the female screw port P
The arm 17 is moved forward so that the front end of the arm 17 protruding from the cylinder case 11 is inserted into the female screw port P. At this time, since the front end of the arm 17 is in a closed state, it does not easily interfere with the female screw port P. Then, the connecting tool 10 is further moved forward, and the seal ring 22 is pressed against the peripheral edge of the opening of the female screw port P.
3 so as to be slightly inserted into the cylinder case 11.

Following this operation, the center shaft 25
The palm is pressed against the pressing surface 30 at the rear end of the center shaft 2 against the bias of the center shaft spring 34.
Push 5 forward. Then, as shown in FIG. 2, the lock pins 26 enter between the arms 17, 17 so that the arms 17, 17 displace the front ends outward about the support shafts 16, 16. The expanded position is established, and the threads of the engaging portion 18 engage with the female screw portion S on the inner periphery of the female screw port P. By the engagement between the engaging portion 18 and the female screw portion S, the connecting tool 10 is held in a state in which it cannot be removed from the female screw port P.

When the center shaft 25 is further pushed forward, the tapered surface 36 of the center shaft 25 is located forward of the lock ball 39 and the reduced diameter portion 35
Is in a state corresponding to the lock ball 39. Then, the urging of the locking spring 42 causes the tapered surface 46 of the operation cylinder 40 to push the lock ball 39 inward to protrude from the inner periphery of the rear cylinder 13 and to move backward until the operation cylinder 40 comes into contact with the stopper 43. And rock ball 3
9 is locked by being pressed by the pressing surface 44 of the operation cylinder 40 and protruding from the inner periphery of the rear cylinder 13.
When the lock ball 39 is locked in this way,
It can be confirmed by visually observing that the operation cylinder 40 has moved backward, or by a sound or a slight impact generated when the operation cylinder 40 comes into contact with the stopper 43.

When the lock of the lock ball 39 is confirmed,
The pushing operation of the center shaft 25 forward is stopped, and the hand is released from the pressing surface 30 to make the center shaft 25 free. Then, the center shaft 25 returns to the rear by the bias of the center shaft spring 34, but the taper surface 36 of the center shaft 25 engages with the lock ball 39 at a slight return. Thereby, the center shaft 25
2 is further restricted, and as shown in FIG. 2, both arms 17, 17 are held in a state of being engaged with the female screw port P, whereby the mounting of the connecting tool 10 to the fluid pressure device F is completed. .

As described above, during the mounting operation, the connecting tool 10 is moved closer to the fluid pressure device F in order to insert the engaging portion 18 of the arm 17 into the female screw port P, and the arms 17 and 17 are expanded. Opening and moving the center shaft 25 to engage the engaging portion 18 with the female screw port P are performed. The moving direction of the connector 10 and the moving direction of the center shaft 25 in both operations are performed. Is both forward. Therefore, both operations can be performed continuously, and the mounting operation can be performed efficiently.

In particular, since the pressing surface 30 perpendicular to the moving direction is provided at the rear end of the center shaft 25,
In the operation of pressing the center shaft 25 toward the fluid pressure device F and the operation of pushing the center shaft 25 forward. Therefore, even when the connecting tool 10 is in a slippery state due to adhesion of oil or the like, the mounting operation can be easily and reliably performed.

When the connecting device 10 is attached to the fluid pressure device F, the fluid sent through the hose connected to the relay port 54 passes through the flow space 52, the communication hole 55, the flow path 56, the arm 17, and the surrounding members. And flows into the fluid pressure device F through the female screw port P from the opening at the front end of the cylinder case 11. In addition, since the connection cylinder 50 to which the hose is connected is rotatable with respect to the cylinder case 11, it is easy to route and handle the hose when the cylinder case 11 is attached to the fluid pressure device F.

Next, the removal of the connecting device 10 from the fluid pressure device F will be described. When the operating cylinder 40 is grasped and moved forward against the urging of the locking spring 42, the pressing of the lock ball 39 by the pressing surface 44 of the operating cylinder 40 is released, and the urging of the center shaft spring 34 is performed. As a result, the center shaft 25 moves rearward while pushing the lock ball 39 outward with the tapered surface 36 thereof. Accordingly, the lock ball 39 is held in a state of protruding from the outer periphery of the cylinder case 11 by engaging with the outer peripheral surface of the center shaft 25. This state can be recognized by the center shaft 25 projecting rearward from the cylinder case 11. When this is confirmed, the operation cylinder 40
, The operation of pushing the operation cylinder 40 forward is stopped.
Then, the operating cylinder 40 is slightly retracted by the bias of the locking spring 42, and the tapered surface 46 of the operating cylinder 40 is engaged with the lock ball 39.

When the center shaft 25 is retracted as described above, the lock pin 26 is
The arms 17, 17 are displaced so as to close their front ends by the urging of the arm urging compression coil spring 23, and their engaging portions 18, 18
From the female screw portion S of the female screw port P. Accordingly, the seal ring 22 projects relatively to the cylinder case 11 due to the urging of the arm urging compression coil spring 23, but because the seal ring 22 is in contact with the fluid pressure device F. The arm 17 moves away from the fluid pressure device F together with the cylinder case 11. As described above, the connector 10 is removed from the fluid pressure device F.

As described above, the connecting device 10 of the present embodiment allows the operation of the operating cylinder 40 to be performed at the time of removal (front side).
Side), the gripping force on the operation cylinder 40 is more likely to be exerted than in the case where the pulling operation is performed toward the front side. Therefore, even if the operation cylinder 40 is slippery with oil or the like, an easy and reliable operation can be performed.

In the connecting device 10 of the present embodiment, the arm 17 is supported by the support shaft 16 at the rear end thereof. It is kept stable. As a result, the connection with the female screw port P is reliably performed.

Further, the arm biasing compression coil spring 23 for biasing the arm 17 in the converging direction also serves as a biasing means for pressing the seal ring 22 toward the fluid pressure device F side. Compared to the case where the biasing of the seal 17 and the biasing of the seal ring 22 are performed by separate springs, respectively, the number of parts is smaller, the cost can be reduced, and the size of the entire connector 10 can be reduced.

Further, in the connecting device 10 of the present embodiment, since the flow path 56 of the cylinder case 11 is provided by utilizing the gap between the inner circumference thereof and the outer circumference of the center shaft 25, the overall shape is elongated. It is summarized. This facilitates handling, mounting, and removal operations.

<Embodiment 2> Next, Embodiment 2 of the present invention will be described with reference to FIGS. The connection tool 60 of the present embodiment includes a cylindrical cylinder case 61 and an arm 67 provided at a front end of the cylinder case 61.
And a center shaft 76 fitted into the hollow of the cylinder case 61.

The cylinder case 61 includes a front cylinder 62 and a rear cylinder 63, and is assembled by screwing a male screw 62A on the outer periphery of the rear part of the front cylinder 62 and a female screw 63A on the inner periphery of the front end of the rear cylinder 63. . An O-ring 64 is fitted between the front cylinder 62 and the rear cylinder 63, and the O-ring 64 allows the front cylinder 62 and the rear cylinder 6 to be fitted.
The connection part with 3 is sealed.

As shown in FIG. 6, the front cylinder 62
At the rear end portion, a mounting groove (vertical groove in the drawing) 65 reaching the outer periphery through the center thereof is formed, and two positions displaced from the axis of the front cylinder 62 both vertically in the drawing. Are formed with shaft fitting holes 62C, 62C. Support shafts 66, 66 whose axes are oriented in the left-right direction are attached to the shaft fitting holes 62 C, 62 C so as to cross the mounting grooves 65, 65.
The arms 67 are respectively supported by the arms 66 so as to be vertically swingable.

The arms 67, 67 are elongated in the front-rear direction as a whole, and the rear ends thereof are bent outward (upward in the upper arm 67 and downward in the lower arm 67). Has a symmetrical shape in the vertical direction with respect to the axis of. The bent end of the rear end portion is fitted to the support shaft 66, whereby the arm 67 moves the posture parallel to the axis of the cylinder case 61 (hereinafter referred to as the “spreading posture”) and the front end portion to the cylinder case 61. 61
Is supported so as to be displaceable between an inclined position (hereinafter, referred to as a converging position) displaced toward the center of the axis. Further, the width of the arm 67 is determined by the mounting groove 6 of the front cylinder 62.
5 has the same width as that of the arm 67.
Is prevented from rattling in the left-right direction (axial direction of the support shaft 16).

The front end of the arm 67 is connected to the cylinder case 61.
Of the front end portion, the outer periphery of the front end portion forms an arc surface concentric with the cylinder case 61 in the expanded posture. An engaging portion 68 formed of a helical thread formed by a part of a male screw is formed on the circular arc surface. The internal thread portion S formed on the inner periphery of the internal thread port P of the pressure device F can be engaged.

At a position outside the support shaft 66 at the rear end of the arm 67, a spring receiving portion 67A projecting rearward is formed. On the other hand, on the inner circumference of the rear cylinder 63,
A spring receiving surface 63B facing forward is formed, and a spring receiving collar 69 is fitted so as to be movable in the front-rear direction. An arm urging member is provided between the spring receiving surface 63B and the spring receiving collar 69. A compression coil spring (arm urging means, which is a component of the present invention) 70 is mounted. The arm biasing compression coil spring 70 is provided with a spring receiving collar 6.
The arm 67 is urged in the convergence direction by pressing the spring receiving portion 67 </ b> A of the arm 67 via 9.

A cylindrical seal holder 71 is fitted in the front cylinder 62 in an airtight manner by an O-ring 73 fitted on the inner periphery of the front cylinder 62. The seal holder 71 has a retracted position where its rear end surface is in contact with the rear end surface 62B of the front cylinder 62,
It is movable in the front-rear direction between a position where the stopper ring 74 is fitted on the inner periphery of the front cylinder 62 and a protruding position that contacts the stopper ring 74. An annular rubber seal ring 72 arranged to surround the arm 67 is fitted around the inner periphery of the front end of the seal holder 71. This seal ring 72
Is protruded from the front end surface of the cylinder case 61 even in the most retracted state, and is pressed by the peripheral edge of the opening of the female screw port P of the fluid pressure device F so that the fluid pressure device F
And the connector 60 of the present embodiment.

The seal holder 71 is formed with a spring receiving surface 71A protruding from the inner periphery thereof and facing rearward, and the back end surface 62B of the front cylinder 62 is a spring receiving surface facing forward. Both spring receiving surfaces 62
A seal ring spring 75 is attached between B and 71A so as to surround the outer periphery of the arm 67. The seal ring spring 75 urges the seal holder 71 forward.

The inner surfaces of the arms 67, 67 facing each other are concentric with the cylinder case 61 in the expanded position, and have the same diameter as a lock pin 77 of a center shaft 76 described later in the expanded position. It has an arc surface. A lock pin 77 is provided between the arms 67, 67.
Is inserted, the arms 67 and 67 are pushed outward by the engagement between the outer peripheral surface and the arcuate surface of the arm 67 to be held in the expanded position.

The center shaft 76 has a lock pin 77 on the front end face, and can be moved in the front-rear direction by being guided by the inner periphery of the rear cylinder 63. An O-ring 78 is fitted on the inner periphery of the rear cylinder 63, and between the outer periphery of the center shaft 76 and the inner periphery of the rear cylinder 63, between an area in front of the O-ring 78 and an area behind the O-ring 78. Is kept airtight.

The center shaft 76 has a main flow passage 79 formed at the rear end surface thereof for fluid circulation, and a plurality of branch flow passages opening from the front end of the main flow passage 79 to the front end surface of the center shaft 76. 80 are formed. The rear end of the center shaft 76 is the cylinder case 61
A male screw 76A for connection to a hose (not shown) is formed on the outer periphery of the protrusion. The fluid that has passed through the hose passes through the main channel 79 and the branch channel 8.
0, flows sequentially through the gap between the front cylinder 62 and the arm 67, and flows out of the opening at the front end face of the cylinder case 61 to the outside.

An operation cylinder 82 is fitted on the outer periphery of the rear end of the rear cylinder 63 so as to be movable in the front-rear direction, and a center shaft 76 is provided behind the operation cylinder 82.
A cylindrical grip 83 is integrally movably fitted to the outer periphery of the grip by a C-shaped retaining ring 84, and a spring receiving surface 82 </ b> A facing the rear formed on the operation cylinder 82 and a front formed on the rear end of the grip 83. A compression coil spring 85 is mounted between the facing spring receiving surface 83A. The compression coil spring 85 urges the operation shaft 82 forward while simultaneously urging the center shaft 76 rearward.

A reduced diameter portion 86 having a diameter slightly smaller than the inner circumference of the rear cylinder 63 is formed on the outer periphery of the center shaft 76, and a front end of the reduced diameter portion 86 is a locking portion 87. On the other hand, a stopper 88 having the same diameter as the reduced diameter portion 86 is formed at the rear end of the inner circumference of the rear cylinder 63. When the center shaft 76 moves rearward relative to the cylinder case 61, the locking portion 87
, The further retreat of the center shaft 76 is restricted. As a result, the rearmost position of the center shaft 76 is set, and the center shaft 76 is always held at the rearmost position by the urging of the compression coil spring 85. When the center shaft 76 is at the rearmost position, the lock pin 77 is
Has receded to a position that does not hinder the displacement to the convergence posture.

When the center shaft 76 has moved forward, the lock arm 67 enters between the arms 67, 67 deep enough. In this state, the rear cylinder 6 is positioned at a position corresponding to the fitting groove 89 formed at a position forward of the reduced diameter portion 86 on the outer periphery of the center shaft 76.
Ball support hole 9 through which the inner peripheral surface 3 passes from the inner peripheral surface to the outer peripheral surface
0 are formed at appropriate intervals in the circumferential direction. In the ball support hole 90, a lock ball (lock member, which is a constituent element of the present invention) 91 is accommodated so as to be movable in the radial direction. The lock ball 91 is set to have such a diameter that it always projects from at least one of the inner peripheral surface and the outer peripheral surface of the rear cylinder 63. When the lock ball 91 projects toward the inner peripheral side of the rear cylinder 63, the protrusion of the lock ball 91 can be engaged with the fitting groove 89 of the center shaft 76. Rock ball 91
Is fitted in the fitting groove 89, the center shaft 76 is locked in a state where the movement in the front-rear direction is restricted.

The operation cylinder 82 is provided with a ball support hole 90.
It moves within the area covering the opening, and constitutes a lock means which is a constituent element of the present invention together with the lock ball 91. A pressing surface 92 is formed on the inner periphery of the operation cylinder 82 so as to press the lock ball 91 so as not to protrude to the outer surface side of the rear cylinder 63 in a state where the lock ball 91 is at the foremost end position in contact with a stopper 63C formed on the rear cylinder 63. ing.
The pressing surface 92 presses the lock ball 91 to form the fitting groove 8.
By engaging the lock shaft 9, the center shaft 76 is locked immovably rearward at a position where the lock pin 77 enters between the arms 67, 67.

Further, a portion of the inner periphery of the operation cylinder 82 which is located forward of the pressing surface 92 is provided with an enlarged portion 9 having a diameter larger than that of the pressing surface 92.
The boundary between the enlarged diameter portion 93 and the pressing surface 92 is a tapered surface 94. Therefore, when the operating cylinder 82 is moved rearward from the locked state against the bias of the compression coil spring 85, the pressing of the lock ball 91 by the pressing surface 92 is released, and the lock ball 91 is The outer peripheral surface of the rear cylinder 63 is pushed outward by the tapered surface 89 </ b> A formed in the fitting groove 89 and protrudes from the outer peripheral surface of the rear cylinder 63. Then, the lock ball 91 is engaged with the outer peripheral surface of the center shaft 76 that has retreated, so that the lock
The operation cylinder 82 is locked in a state where its forward movement is restricted while its tapered surface 94 is engaged with the lock ball 91. In addition, a projection 95 is formed on the outer periphery of the operation cylinder 82 for facilitating the pushing operation backward.

Next, the operation of the present embodiment will be described.
The connecting tool 60 of this embodiment is connected to the female screw port P of the fluid pressure device F.
As shown in FIG. 4, the center shaft 76 projects largely rearward from the cylinder case 61 so that the arms 67 and 67 are in a converging posture with their front ends closed. Connect the connecting tool 60 to the female screw port P
And the arm 67 is moved forward, and the front end of the arm 67 is inserted into the female screw port P. At this time, since the front end of the arm 67 is in a closed state, there is no possibility of interference with the female screw port P. Then, the connecting tool 60 is further moved forward, and the seal ring 72 is pressed against the peripheral edge of the opening of the female screw port P, so that the seal ring 72 is slightly inserted into the cylinder case 61 against the bias of the seal ring spring 75. To do.

Following this operation, the grip 83 is gripped to move the center shaft 76 forward against the bias of the compression coil spring 85. Then, as shown in FIG.
When the lock pin 77 enters between the arms 67, 67, the arms 67, 67 displace their front ends outward about the support shafts 66, 66, and assume an expanded position. Engages with the internal thread S on the inner periphery of the internal thread port P. Due to the engagement between the engaging portion 68 and the female screw portion S, the connection tool 60 is in a state where it cannot be pulled out from the female screw port P.

When the center shaft 76 is further moved forward, when the fitting groove 89 of the center shaft 76 reaches a position corresponding to the lock ball 91, the compression coil spring 85 urges the taper of the operating cylinder 82. The surface 94 pushes the lock ball 91 inward to protrude from the inner periphery of the rear cylinder 63, and the operation cylinder 82
The lock ball 91 moves forward until the lock ball 91 contacts the lock groove 91, and is locked in a state of being fitted in the fitting groove 89 by being pressed by the pressing surface 92 of the operation cylinder 82.

When the lock ball 91 is locked, it can be confirmed by visually observing that the operation cylinder 82 has moved forward, or by the sound or slight impact generated when the operation cylinder 82 comes into contact with the stopper 63C. Can be. When the lock of the lock ball 91 is confirmed, the operation of pushing the center shaft 76 forward is stopped. The center shaft 76 is restrained from moving in the front-rear direction by the engagement between the fitting groove 89 and the lock ball 91, and is held in a state where the arms 67 and 67 are engaged with the female screw port P as shown in FIG. Is done. As described above, the attachment of the connection tool 60 to the fluid pressure device F is completed.

At the time of the mounting operation as described above, as in the first embodiment, the operation of moving the connection tool 60 close to the hydraulic device F and the operation of moving the center shaft 76 are both performed by the operation of pushing forward. As a result, both operations can be performed continuously, and the mounting operation can be performed efficiently. Further, for the same reason as in the first embodiment, the sealing ring spring 75 can be easily and reliably elastically contracted, so that a high sealing effect can be obtained.

When removing the connecting member 60, when the operating cylinder 82 is moved backward against the bias of the compression coil spring 85, the pressing of the lock ball 91 by the pressing surface 92 of the operating cylinder 82 is released. Therefore, the bias of the compression coil spring 85 causes the center shaft 76 to move rearward while pushing the lock ball 91 outward by the tapered surface 89A of the fitting groove 89, and the lock ball 91 moves to the outer peripheral surface of the center shaft 76. Is held in a state of protruding from the outer periphery of the cylinder case 61. Thereafter, when the operation cylinder 82 is released from the hand, the operation cylinder 82 is slightly advanced by the bias of the compression coil spring 85, and the tapered surface 94 of the operation cylinder 82 is engaged with the lock ball 91.

When the center shaft 76 is retracted as described above, the lock pin 77 is pulled out from between the arms 67, 67. , 67 are displaced so as to close their front ends, and their engaging portions 68 are disengaged from the female screw portion S of the female screw port P. Accordingly, the seal ring 72 projects relatively to the cylinder case 61 by the bias of the seal ring spring 75. However, since the seal ring 72 is in contact with the fluid pressure device F, The arm 67 moves away from the fluid pressure device F together with the arm 61. As described above, the connection tool 60 is removed from the fluid pressure device F.

In the connection tool 60 of this embodiment, similarly to the first embodiment, the arm 67 has a support shaft 6 at its rear end.
6, the arm 67 is stably held when engaged with the female screw port P in the expanded state, so that the connection with the female screw port P can be reliably performed. ing.

In this embodiment, the means for urging the center shaft 76 rearward and the means for urging the operation cylinder 82 forward are shared by one compression coil spring 85. Compared to the case where the biasing means is performed by separate springs, the number of parts is smaller, the cost can be reduced, and the size of the entire connection tool 60 can be reduced.

<Embodiment 3> Next, a third embodiment of the present invention will be described with reference to FIGS. The connection tool 100 of the present embodiment differs from the second embodiment in the configuration of the center shaft, the biasing means of the center shaft, the biasing means of the operating cylinder, and the biasing means of the arm.
Other configurations are the same as those of the second embodiment, and thus the same configurations are denoted by the same reference numerals, and description of the structure, operation, and effect is omitted.

The center shaft 101 is the shaft body 1
02, lock pin 103 and lock pin spring 1
04. The shaft main body 102 has a cylindrical shape, and its hollow is a fluid flow path 105. Two arms 67, 67 are provided at the front end in the shaft body 102.
The lock pin 103 which can enter into the space is provided so as to be relatively movable in the front-rear direction by fitting a cylindrical portion 106 formed at the rear end thereof. The rear end surface of the cylindrical portion 106 of the lock pin 103 is a spring receiving surface 106A, while the inner periphery of the shaft main body 102 is formed with a spring receiving surface 102A facing forward at a longitudinal center position thereof. A lock pin spring 1 composed of a compression coil spring is provided between the two spring receiving surfaces 102A and 106A.
04 is attached. The lock pin 103 is urged forward by the lock pin spring 104. A stopper ring 107 is fitted on the inner peripheral front end of the shaft main body 102, and the lock pin 103 is
6 is restricted from moving forward from the position at which it contacts the stopper ring 107. The cylindrical portion 106 of the lock pin 103 is formed with a flow hole 108 that cuts out from the front end surface to the outer peripheral surface to communicate the flow path 105 of the shaft main body 102 to the space on the arm 67 side.

A spring receiving surface 83A at the back end in the grip 83 fitted to the rear end of the center shaft 101,
Spring receiving surface 63D formed on the rear end surface of rear cylinder 63
A center shaft spring 109 formed of a compression coil spring is mounted between the cylinder shaft 61 and the center shaft 101. The center shaft spring 109 urges the center shaft 101 rearward with respect to the cylinder case 61.

A spring receiving ring 110 is fitted on the outer periphery of the rear cylinder 63 at a position rearward of the operating cylinder 82 fitted on the outer periphery so as to be movable in the front-rear direction. And the spring receiving surface 82A of the operation cylinder 82
A lock spring 111 composed of a compression coil spring is mounted between the two. This lock spring 11
1, the operation cylinder 82 is urged forward.

A spring receiving groove 112 is formed on the outer periphery of both arms 67, 67.
Reference numeral 2 denotes a spring for urging an arm made of a garter spring (an urging means for an arm, which is a component of the present invention).
3 is mounted so as to surround both arms 67, 67.
Both arms 67, 67 are urged by the arm urging spring 113 in a converging direction to close the front ends thereof.

Next, the operation of the present embodiment will be described.
When attaching the connector 100 of this embodiment to the female screw port P of the fluid pressure device F, it is in the state shown in FIG. In this state, the center shaft 101 protrudes largely rearward from the cylinder case 61, and the lock pin 103 is moved by the urging of the lock pin spring 104 so that the cylindrical portion 1
06 is at the foremost end position where it abuts against the stopper ring 107, but the front end of the lock pin 103 is connected to both arms 67, 67.
The arms 67, 67 are in a converging posture with their front ends closed by the urging of the arm urging spring 113.

In this state, the connector 100 is gripped and moved to the fluid pressure device F side, the front end of the arm 67 is inserted into the female screw port P, and the seal ring 72 is pressed against the peripheral edge of the opening of the female screw port P. The grip 83 is gripped and the center shaft 101 is moved forward against the bias of the center shaft spring 109. Then, the lock pin 103 enters between the arms 67, 67 and displaces the arms 67, 67 in the expanding direction. When the tapered surface 103 </ b> A of the lock pin 103 engages with the tapered surface 67 </ b> B of the arm 67. Further advance of the lock pin 103 is restricted, and thereafter, only the shaft main body 102 advances while elastically compressing the lock pin spring 104. When the roll ball 91 is fitted into the fitting groove 89, the center shaft 101 is locked irreversibly as shown in FIG.
7, 67 are locked in a state of being engaged with the female screw port P.

When removing the connection tool 100, the operation cylinder 8
When the lock ball 91 is moved backward against the urging of the lock spring 111, the center shaft 1
01 is released, and the center shaft 101 retreats while pushing the lock ball 91 outward by the urging of the center shaft spring 109 and the lock pin spring 104. After the cylindrical portion 106 of the lock pin 103 comes into contact with the stopper ring 107 during the retreat of the center shaft 101, the lock pin 103
Are integrated with the shaft main body 102 and are retracted only by the urging of the center shaft spring 109. When the center shaft 101 finishes retreating, the user releases the operation cylinder 82.

When the center shaft 101 retreats, its lock pin 103 is pulled out from between the arms 67, 67, and the arms 67, 67 are displaced to the converging posture by the urging of the arm urging spring 113. The engaging portion 68 comes off the female screw portion S of the female screw port P. Accordingly, the arm 67 and the cylinder case 61 are separated from the hydraulic device by the urging of the seal ring spring 75, and the connector 100 is removed from the hydraulic device F.

In this embodiment, the lock pin 103 and the arm 67 are engaged on the tapered surfaces 103A and 67B, and the lock pin 103 is urged forward with respect to the shaft body 102 by the lock pin spring 104. Therefore, when the arm 67 is fitted to the female screw port P, the tolerance between the pitch diameter of the thread of the arm 67 and the pitch diameter of the female screw portion S of the female screw port P is absorbed. Therefore, rattling between the arm 67 and the female screw port P can be prevented.

<Other Embodiments> The present invention is not limited to the embodiments described above with reference to the drawings. For example, the following embodiments are also included in the technical scope of the present invention. In addition, various changes can be made without departing from the scope of the invention.

(1) In the above embodiment, the case where two arms are provided has been described.
The arm may be divided in the circumferential direction and provided three or more.

[Brief description of the drawings]

FIG. 1 is a sectional view of a disconnected state according to a first embodiment.

FIG. 2 is a sectional view of a connection state according to the first embodiment.

FIG. 3 is an exploded perspective view of an arm and a support member thereof according to the first embodiment.

FIG. 4 is a cross-sectional view of a disconnected state according to the second embodiment.

FIG. 5 is a sectional view of a connection state according to the second embodiment.

FIG. 6 is an exploded perspective view of an arm and a support member thereof according to a second embodiment.

FIG. 7 is a cross-sectional view of the third embodiment in a disconnected state.

FIG. 8 is a sectional view of a connection state according to a third embodiment.

FIG. 9 is an exploded perspective view of an arm and a support member thereof according to a third embodiment.

FIG. 10 is a side view of a conventional example in which a handle is not operated.

FIG. 11 is a side view of a conventional example in which a handle is operated.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Connector 11 ... Cylinder case 16 ... Support shaft 17 ... Arm 18 ... Engagement part 22 ... Seal ring 23 ... Compression coil spring for arm urging (arm urging means) 25 ... Center shaft 30 ... Pressing surface 39 ... Lock Ball (locking member) 40 Operating cylinder 50 Connection cylinder 52 Communication space 54 Relay port 55 Communication hole 56 Flow path F Fluid pressure device P Female screw port S Female screw part

──────────────────────────────────────────────────続 き Continued on front page (58) Field surveyed (Int.Cl. ⁶ , DB name) F16L 37/12 F16L 37/22

Claims (6)

(57) [Claims] 1. A cylinder case which is connectable to a hose and has a fluid flow path opened at a front end face thereof;
A plurality of arms having an engaging portion formed on the outer periphery of a protruding portion from the front end surface of the cylinder case, which is arranged in a circumferential direction and is displaceable in a radial direction, and wherein the arms are converged. After inserting the engaging portion into the female screw port of the fluid pressure device, the arm is expanded and the engaging portion is engaged with the female screw portion on the inner periphery of the female screw port to connect to the fluid pressure device. An arm urging means for urging the arm in the converging direction; and an arm urging means provided in the cylinder case so as to be able to advance and retreat in the front-rear direction, displaced in the forward direction and engaged between the plurality of arms. A center shaft that expands and displaces the arm by entering while moving, and a center shaft that is advanced between the arms and displaces the arm can be locked in a retreat restriction state, Fitting female thread port of the fluid pressure device, characterized in that it is configured with a releasable locking means locking the Ntashafuto, the. 2. A fluid pressure device according to claim 1, wherein a pressing surface orthogonal to a direction in which the center shaft advances and retreats is provided at a rear end of the center shaft so as to protrude rearward of the cylinder case. Female threaded port fitting. 3. The lock means is capable of being displaced in a radial direction between a position where the center shaft which has entered between the plurality of arms is engaged in the retraction restricted state and a position where the engagement is released. A member and an operating cylinder fitted to the outer periphery of the cylinder case so as to be displaceable in the front-rear direction, and the inner peripheral surface of the operating cylinder is connected to the center shaft by the rearward displacement of the operating cylinder. While holding in the engaged state,
The female screw port of a hydraulic device according to claim 1 or 2, wherein the engagement of the lock member with the center shaft can be released by a forward displacement operation of the operation cylinder. Fittings. 4. The arm according to claim 1, wherein a rear end of the arm is supported by a support shaft that is eccentric and crosses the axis of the cylinder case.
The connector for female screw ports of a fluid pressure device according to any one of the above. 5. A seal ring disposed at a front end of the cylinder case so as to surround the arm and capable of closely contacting an opening peripheral portion of an internal thread port of the hydraulic device, and the seal ring is directed toward the hydraulic device. And a compression coil spring that urges forward a position closer to the axis of the cylinder case than the support shaft of the arm, and is also used as an arm urging means. The connector for a female screw port of a fluid pressure device according to claim 4, wherein: 6. A communication hole is formed in the cylinder case to communicate the internal flow path with the outer peripheral surface, and a region including the communication hole is formed on the outer circumference of the cylinder case over the entire circumference. And a rotatable connection tube is mounted while maintaining airtightness in the communication space, and the connection tube is formed with a relay port that communicates with the communication space and allows a hose to be attached and detached. The connector for a female screw port of a fluid pressure device according to claim 1, wherein: