Fittings

Abstract

The present invention provides a fitting that offers excellent shielding at the connection point between the hose and the fitting, and allows for easy and reliable attachment of even large-diameter high-pressure hoses to the fitting. [Solution] The joint 1 has a cylindrical metal joint body 3. A cylindrical first joint portion 4 is provided on one end of the joint body 3 to which the hose 2 is attached, and a second joint portion 5 is provided on the other end of the joint body 3 to which the hose 2 is attached. A cylindrical hose clamping member 6 for clamping the hose 2 is attached to the outer circumference of the first joint portion 4.

Description

Technical Field

[0001] The present invention relates to a joint used when connecting two hoses or pipes, and particularly to a joint suitable for use in connecting large-diameter high-pressure hoses.

Background Art

[0002] Generally, when supplying a liquid to a liquid tank, a method is taken in which a hose is connected to a supply pipe provided at a supply port of the liquid tank via a joint, and the liquid is fed into the liquid tank.

Summary of the Invention

Problems to be Solved by the Invention

[0003] When the liquid supplied to the liquid tank is an oily liquid that requires care in handling, it is necessary to securely seal the connection portion so that the liquid does not leak from the connection portion between the hose and the joint. Further, when the hose is a large-diameter high-pressure hose, the handling of the hose is complicated and the work of attaching the hose to the joint has been complicated.

[0004] The present invention has been made in view of such circumstances, and its object is to provide a joint that is excellent in the shielding function of the connection portion between the hose and the joint, and that can easily and surely attach even a large-diameter high-pressure hose to the joint.

Means for Solving the Problems

[0005] To achieve the above objective, the joint according to the present invention is a joint in which a cylindrical joint body is provided with a cylindrical first joint portion into which a hose is fitted on one end, and a cylindrical second joint portion into which a hose or pipe is attached on the other end of the joint body, and a cylindrical hose tightening member is attached to the first joint portion and has a pair of radially opposing operating handles on its outer circumference, wherein a male screw portion is formed on the base end outer circumference of the first joint portion into which a female screw portion formed on the inner circumference of the hose tightening member is screwed, and a cylindrical first hose fitting portion is formed on the tip end outer circumference continuous with the male screw portion, a plurality of annular first hose locking ribs are formed on the outer circumference of the first hose fitting portion at predetermined intervals in the axial direction, a second hose fitting portion is formed on the inner circumference of the hose tightening member continuous with the female screw portion, and a spiral second hose locking rib is formed on the second hose fitting portion in the axial direction, and the hose is clamped between the first hose fitting portion and the second hose fitting portion.

[0006] In this configuration, the hose is held between each hose fitting portion, the connection between the hose and the fitting body is sealed, and the hose is positioned and fixed in a stable state. Furthermore, since the operator can rotate the hose clamping member while gripping the pair of operating handles with both hands, the alignment of the female threaded portion of the hose clamping member and the male threaded portion of the first joint can be easily performed, making it easy to attach the hose clamping member to the joint body.

[0007] Preferably, the present invention is characterized in that, in the joint, the other end of a cylindrical hose connecting member, to which a hose or pipe is attached at one end, is detachably mounted on the inner circumferential surface of the second joint portion. With this configuration, the worker can connect the hose attached to the fitting body with the hose or pipe attached to the hose connecting member by gripping the pair of operating handles and lifting the hose while attaching the second fitting part of the fitting body to the hose connecting member, making hose connection work easy.

[0008] Preferably, the present invention is characterized in that, in the joint, an opening is formed in the second joint portion, the base end of a lock arm is rotatably attached to the opening, and the base end of the lock arm is provided with an engaging projection that can engage with and disengage from an annular engaging groove formed on the outer circumferential surface of the hose connecting member. With this configuration, the second joint can be inserted into the hose connecting member, and the joint body can be positioned and fixed to the hose connecting member by closing the lock arm. This allows for easy and reliable connection of the hose attached to the joint body to the hose or pipe attached to the hose connecting member. [Effects of the Invention]

[0009] According to this invention, it is possible to provide a fitting that has excellent shielding function at the connection point between the hose and the fitting, and that allows even large-diameter high-pressure hoses to be attached to the fitting easily and reliably. [Brief explanation of the drawing]

[0010] [Figure 1] This is a side view of a joint according to an embodiment of the present invention. [Figure 2] This is an exploded side view of the joint. [Figure 3] This is a one-sided cross-sectional view taken along line III-III in Figure 2. [Figure 4] Figure 2 is a one-sided cross-sectional view along line IV-IV. [Figure 5] Figure 2 is a cross-sectional view of one side of the VV line. [Figure 6] This is a cross-sectional view showing the state in which a hose is installed between the fitting body and the hose clamping member. [Figure 7] This is an enlarged cross-sectional view of the main part showing the state in which the hose is installed between the fitting body and the hose clamping member. [Modes for carrying out the invention]

[0011] The following describes in detail the joint according to the embodiment of the present invention. Figure 1 is a side view of a joint according to an embodiment of the present invention, showing the state in which a hose connecting member is attached. Figure 2 is an exploded side view of the joint shown in Figure 1. Figure 3 is a one-sided cross-sectional view taken along line III-III in Figure 2. Figure 4 is a one-sided cross-sectional view taken along line IV-IV in Figure 2. Figure 5 is a one-sided cross-sectional view taken along line VV in Figure 2. Figure 6 is a cross-sectional view showing the state in which a hose is attached between the joint body and the hose tightening member, showing a cross-section of the hose portion. Figure 7 is an enlarged cross-sectional view of the main part showing the state in which a hose is attached between the joint body and the hose tightening member.

[0012] (Overall configuration of the joint) The fitting 1 according to this embodiment is a fitting used in a large-diameter high-pressure hose (hereinafter simply referred to as "hose") 2 with a diameter of approximately 10 to 15 cm for supplying liquid to a liquid tank. As shown in Figures 1 and 2, the fitting 1 has a cylindrical fitting body 3 made of metal. A cylindrical first fitting portion 4 is provided on one end of the fitting body 3 to which the hose 2 is attached, and a second fitting portion 5 is provided on the other end of the fitting body 3 to which the hose 30 is attached.

[0013] The outer circumference of the first joint 4 is fitted with a cylindrical hose clamping member 6 for gripping the hose 2. The hose clamping member 6 is molded by die casting. Both the joint body 3 and the hose clamping member 6 are large in diameter.

[0014] This invention is also applicable to cases where the second joint 5 is directly attached to a large-diameter supply pipe 5 provided in a liquid tank.

[0015] (First joint and hose clamping member) A male threaded portion 8 is formed on the outer circumferential surface of the base end of the first joint portion 4, which screws into a female threaded portion 7 formed on the inner circumferential surface of the hose tightening member 6. On the tip side of the first joint portion 4, a cylindrical first hose fitting portion 9 is formed, which has a smaller diameter than the male threaded portion 8.

[0016] On the outer peripheral surface of the first hose fitting portion 9, a plurality of annular first hose locking ribs 10 are formed at predetermined intervals in the axial direction. As shown in FIG. 7, the outer periphery of the first hose locking rib 10 is formed with a tapered surface 10A that slopes downward from the base end side toward the tip end side, and the base end side of the first hose locking rib 10 is formed to rise at an acute angle. Therefore, when fitting the hose 2 into the first hose fitting portion 9, the inner peripheral surface of the hose 2 can be fitted along the tapered surface 10A of the first hose locking rib 10, and the hose 2 can be smoothly attached to the first hose fitting portion 9.

[0017] Also, when the hose 2 is attached to the first hose fitting portion 9, the hose 2 is in a state where the inner peripheral surface is bitten into the first hose locking rib 10, and the hose 2 can be securely attached.

[0018] On the inner peripheral surface of one end side of the hose tightening member 6, a female screw portion 7 that engages with the male screw portion 8 of the first joint portion 4 is formed. In the hose tightening member 6, the other end side from the female screw portion 7 is a cylindrical second hose fitting portion 11, and a spiral second hose locking rib 12 is formed in the axial direction on the inner peripheral surface of the second hose fitting portion 11.

[0019] After the hose 2 is attached to the first hose fitting portion 9, when the hose tightening member 6 is fitted into the first joint portion 4, the hose tightening member 6 is fitted so that the second hose locking rib 12 bites into the outer peripheral surface of the hose 2.

[0020] Therefore, no load is applied to the attachment operation of the hose tightening member 6, and the hose tightening member 6 can be smoothly attached to the first joint portion 4. Then, the hose 2 is sandwiched between the hose fitting portions 9 and 11, the connection portion between the hose 2 and the joint body 3 is sealed, and the hose 2 is positioned and fixed at a predetermined position in a stable state.

[0021] A pair of operating handles 13, 13 are provided protruding from the outer circumferential surface of the first joint 4, facing each other in the radial direction. The pair of operating handles 13, 13 are used to rotate the hose tightening member 6 along the outer circumferential surface of the first cylindrical joint 4 when fitting the hose tightening member 6 into the first joint 4. Furthermore, the pair of operating handles 13, 13 can also be used to hold the hose 2 when connecting the fitting body 3, to which the hose 2 is attached, to the supply pipe on the liquid tank side, making the hose connection work easier.

[0022] (Second joint and hose connecting member) The other end of a cylindrical hose connecting member 14, to which a hose 30 is attached at one end, is detachably attached to the inner circumferential surface of the second joint 5. A third hose fitting portion 15 is provided at one end of the hose connecting member 14, and a cylindrical joint connecting portion 16 is provided coaxially with the third hose fitting portion 15 at the other end.

[0023] The third hose fitting portion 15 is tightly fitted to the inner circumferential surface of the joint connection portion 16, and the space between the third hose fitting portion 15 and the joint connection portion 16 is sealed. Within the second joint 5, an annular sealing member 17 is attached at the position where the tip of the joint connection 16 abuts. Therefore, when the hose connecting member 14 is attached to the second joint 5, the space between the second joint 5 and the joint connection 16 is sealed.

[0024] An annular third hose locking rib 18 is formed in an axial spiral shape on the outer circumferential surface of the third hose fitting portion 15. When the hose 30 is fitted into the third hose fitting portion 15, the third hose locking rib 18 bites into the inner circumferential surface of the hose 30, thereby positioning and fixing the hose 30 to the outer circumferential surface of the third hose fitting portion 15.

[0025] On the outer circumferential surface of the joint connection portion 16, an annular engagement groove 19 is formed, which allows the engaging projections 26 and 27 formed at the ends of the lock arms 22 and 23 (described later) to engage and disengage when the second joint portion 5 is attached to the joint connection portion 16. A pair of openings 20 and 21 are formed in the outer circumferential wall of the second joint 5 so as to be facing each other in the radial direction. The end of a lock arm 22, which positions and fixes the joint connection part 16 to the second joint part 5, is attached to the opening 20 so as to be rotatable around the support shaft 24 in the direction of arrow A1 or arrow A2 in Figure 4. Furthermore, the end of the lock arm 23, which positions and fixes the joint connection part 16 to the second joint part 5, is attached to the opening 21 so as to be rotatable around the support shaft 25 in the direction of arrow B1 or arrow B2 in Figure 4.

[0026] When the engaging protrusions 26 and 27 are engaged with the engaging grooves 19 by the rotational operation of each lock arm 22 and 23, the second joint 5 is positioned and fixed to the hose connecting member 14. Each of the lock arms 22 and 23 is fitted with a ring member 28 and 29 at its tip, respectively, for the operator to grip with their fingers or other body parts when rotating the lock arms 22 and 23.

[0027] (Connection between the first joint and the hose clamping member) First, the hose 2 is temporarily inserted into the hose clamping member 6. Next, the hose 2 is fitted into the first hose fitting portion 9 of the first joint portion 4. When the hose 2 is fitted into the first hose fitting portion 9 of the first joint portion 4, the inner surface of the hose 2 bites into the first hose locking rib 10 of the first hose fitting portion 9, restricting the axial movement of the hose 2. As a result, the hose 2 is positioned and fixed in the predetermined position of the first hose fitting portion 9.

[0028] Next, the female threaded portion 7 of the hose clamping member 6, which is temporarily inserted into the hose 2, is screwed onto the male threaded portion 8 of the first joint 4. This operation clamps the hose 2 between the first hose fitting portion 9 of the first joint 4 and the second hose fitting portion 11 of the hose clamping member 6, and the hose 2 is attached to the joint body 3. At this time, the connection between the hose 2 and the joint body 3 is sealed, resulting in excellent shielding.

[0029] When fitting the hose clamping member 6 onto the first joint 4, the worker does not need to use any special tools. For example, the worker can hold the hose 2 under their arm and, while gripping the operating handles 13, 13 with both hands, rotate the hose clamping member 6 to fit it onto the first joint 4, making it easy to attach the hose 2 to the joint body 3.

[0030] (Connection between the second joint and the hose connecting member) First, rotate the lock arm 22 in the direction of arrow A1 in Figure 4 to hold it in the open position. Also, rotate the lock arm 23 in the direction of arrow B1 in Figure 4 to hold the lock arm 23 in the open position. At this time, the engaging protrusions 26 and 27 provided at the base ends of the lock arms 22 and 23 move from inside the second joint 5 into the openings 20 and 21.

[0031] Next, while maintaining the open position of the lock arms 22 and 23, the second joint 5 is fitted into the joint connection portion 16 of the hose connecting member 14. When fitting the second joint 5 into the joint connection portion 16 of the hose connecting member 14, the worker can grip the pair of operating handles 13, 13 provided on the hose tightening member 6 and perform the work while lifting the hose 2, making it easy to attach the joint body 3 to which the hose 2 is connected to the hose connecting member 14.

[0032] Finally, the lock arm 22, which is held in the open position, is rotated in the direction of arrow A2 in Figure 4 to close the lock arm 22, and the engaging projection 26 provided at the base end of the lock arm 22 engages with the annular engaging groove 19 formed on the outer circumference of the joint connection portion 16 of the hose connecting member 14. Furthermore, the lock arm 23 is rotated in the direction of arrow B2 in Figure 4 to close the lock arm 23, and the engaging projection 27 provided at the base end of the lock arm 23 engages with the annular engaging groove 19 formed on the outer circumference of the joint connection portion 16 of the hose connecting member 14.

[0033] This restricts the axial movement of the joint body 3 and the hose connecting member 14, resulting in the joint body 3 and the hose connecting member 14 being connected at a predetermined position. In other words, the hose 2 attached to the joint body 3 and the hose 30 attached to the hose connecting member 14 are connected.

[0034] In this way, the second joint 5 can be inserted into the joint connection portion 16 of the hose connecting member 14, and the joint body 3 can be attached and fixed to the hose connecting member 14 by closing the lock arms 22 and 23. This makes it easy and reliable to connect the hose 2 attached to the joint body 3 and the hose 30 attached to the hose connecting member 14.

[0035] As described above, with the fitting 1 of this embodiment, even a large-diameter high-pressure hose can be easily and reliably attached to the fitting body 3, and the shielding function of the connection portion between the hose 2 and the fitting body 3 is also excellent. Furthermore, even with a large-diameter high-pressure hose, the process of attaching the hose 2 to the fitting body 3 can be easily performed.

[0036] The present invention is not limited to the embodiments described above. That is, those skilled in the art may make various modifications, combinations, subcombinations, and substitutions with respect to the components of the embodiments described above, within the technical scope of the present invention or its equivalents. [Industrial applicability]

[0037] This invention is applicable to fittings used for connecting hoses or pipes. [Explanation of symbols]

[0038] 1················ Fitting 2, 30············Hose 3················Fitting body 4················First joint section 5················Second joint section 6················Hose clamping component 7················Female threaded section 8················Male screw part 9················First hose fitting section 10···············First hose locking rib 11···············Second hose fitting section 12···············Second hose locking rib 13, 13············Operating handle 14···············Hose connecting parts 19···············Engaging groove 20, 21············Opening 22, 23············Lock Arm 26, 27... Engaging protrusion

Claims

1. A joint comprising a cylindrical joint body with a cylindrical first joint portion at one end into which a hose is fitted, and a cylindrical second joint portion at the other end of the joint body with a hose or pipe attached to it, wherein a cylindrical hose tightening member is attached to the first joint portion and has a pair of radially opposing operating handles on its outer surface, A male threaded portion is formed on the base end outer circumferential surface of the first joint portion, into which the female threaded portion formed on the inner circumferential surface of the hose tightening member is screwed, and a cylindrical first hose fitting portion continuous with the male threaded portion is formed on the tip end outer circumferential surface. Multiple annular first hose locking ribs are formed on the outer circumferential surface of the first hose fitting portion at predetermined intervals in the axial direction. A second hose fitting portion is formed on the inner circumferential surface of the hose clamping member, continuous with the female screw portion, and a spiral second hose locking rib is formed axially on the second hose fitting portion, and the hose is sandwiched between the first hose fitting portion and the second hose fitting portion in this joint.

2. The joint according to claim 1, wherein the other end of a cylindrical hose connecting member, to which a hose or pipe is attached at one end, is detachably mounted on the inner circumferential surface of the second joint.

3. The joint according to claim 2, wherein an opening is formed in the second joint portion, and the base end of a lock arm is rotatably attached to the opening, and the base end of the lock arm is provided with an engaging projection that can engage with and disengage from an annular engaging groove formed on the outer circumferential surface of the hose connecting member.

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