JPH0317114Y2 - - Google Patents

Description

[Detailed description of the invention] [Field of industrial application] This invention relates to a pipe joint used for a pipe body made of plastic or rubber, and more specifically, a pipe joint that allows repeated attachment and detachment of the pipe body and is particularly durable. Regarding.

[Industrial application field]

In recent years, tube bodies made of plastic or rubber have come to be used as tube bodies for transferring fluids due to their weight, flexibility, chemical resistance, etc. Various types of pipe joints have been developed for this purpose. Among these, pipe joints, which allow pipe bodies to be easily attached and detached without using tools, are used in various types of equipment because of their ease of handling.

One type of pipe joint is a joint body that has a hollow part into which the pipe body is inserted, and a pipe that is held within the joint body by biting into the outer periphery of the pipe body to prevent the pipe body from coming off. A toothed washer-shaped gripping tool having a plurality of claw pieces on the inner peripheral edge side that are inclined toward the body insertion direction, and a peripheral edge part (annular base) of this gripping tool.
a presser cylinder fitted into the joint main body to hold it between a stepped portion provided on a wall surface within the joint main body, and a claw piece of the gripping tool that is slidably fitted inside the presser cylinder and A pipe joint equipped with an open cylinder that releases the claws from digging into the pipe body by pushing outward and a seal ring having a U-shaped cross section or the like that makes elastic contact with the pipe body and the inner wall of the joint body when the pipe body is inserted. There is.

With this pipe fitting, the pipe body is fixed within the joint body simply by inserting the pipe body into the joint body, and the fixed pipe body can be removed from the joint body simply by pushing the open tube in the pipe body insertion direction. (For example, Utility Model Application Publication No. 1988-19887 proposed by the present applicants)
(Refer to Utility Model Application Publication No. 145188/1988).

[Problem that the invention attempts to solve]

However, in such conventional pipe joints, the toothed washer-shaped gripper is loosely fitted with a slight space left between the step inside the joint body and the end surface of the presser cylinder. There has been a problem in that the peripheral edge is easily deformed due to repeated attachment and detachment of the tubular body or excessive tension in the direction of pulling out the tubular body, resulting in a decrease in gripping force. In particular, when used in industrial robots that operate using pneumatic pressure, loads such as tension, twisting, and impact are applied to the joints, which can damage the gripping tools, so improvements in durability have been desired.

This invention was devised in view of the problems of the prior art, and includes forming a cylindrical flange on the outer periphery of the gripping tool, and making cuts at the rear positions of each claw of the cylindrical flange. By providing
The purpose is to solve the above problems.

[Means for solving problems]

In order to achieve the above object, this invention consists of a joint body having a hollow portion into which the pipe body is inserted, and a plurality of joint bodies which are located inside the joint body and are inclined in the pipe body insertion direction for biting into and gripping the pipe body outer periphery. an annular gripping tool having a claw piece; a presser cylinder that fits inside the joint body and holds the gripper loosely between a stepped portion in the joint body; an open cylinder that is fitted and expands the claws of the gripper toward the inner wall of the joint body to release the claws from biting into the outer periphery of the tube; and a seal that elastically contacts the tube and the inner wall of the joint body when the tube is inserted. In the pipe fitting, the gripping tool has a cylindrical flange portion integrally formed on the outer circumferential side of the annular base, and has a cylindrical flange portion on the inner circumferential side inclined toward the opposite side with respect to the cylindrical flange portion. It has a plurality of integrally formed claw pieces, and the cylindrical flange portion includes:
The pipe joint is characterized in that a notch is provided at the rear position of each claw piece from the peripheral edge side.

[Effect]

In this invention, a cylindrical flange portion is provided on the outer periphery of the annular base that forms the base of the plurality of claw pieces, and is provided with a cut that is substantially perpendicular to the annular base and inward from the periphery side, that is, in the insertion direction of the tube body. Since this is a pipe joint configured to loosely fit and hold a gripping tool with It is reinforced by a cylindrical flange part that is integrally provided at almost right angles to the cylindrical flange part, and the joint body and presser cylindrical body are loosely fitted and held in this cylindrical flange part, so that external forces such as tension and torsion are prevented unlike conventional ones. Not only will the gripping tool not be deformed beyond its elastic limit when the grip is applied, but it will also be less prone to fatigue deformation even when the tubular body is repeatedly attached and detached, resulting in excellent durability.

Furthermore, when attaching and detaching the tubular body, the annular base that forms the base of the claw tends to bend due to stress due to changes in the inclination of the claw. Since the cylindrical flange part is provided with a notch from the peripheral side at the rear position of each claw piece, the cylindrical flange part does not interfere with the curvature of the annular base, and the ease of attaching and detaching the tubular body is maintained well. .

〔Example〕

FIG. 1 is an upper half longitudinal sectional side view showing an embodiment of the pipe joint 1 according to this invention, and the pipe joint 1 shown in the figure is
is a joint body 3 having a hollow portion into which the pipe body is inserted.
, a gripping tool 5 having a biting claw piece 4 held in the joint body 3, a presser cylinder 6 fitted into the joint body 3 to hold this gripping tool, and a claw piece of the gripping tool 5. 4 in the tube insertion direction, and a seal ring 8 having a U-shaped cross section that comes into elastic contact with the tube 2 and the inner wall 3a of the joint body when the tube is inserted.

The joint body 3 has three steps 3 on its inner wall surface 3a.
b, 3c, and 3d, and an engaging portion 3e for fitting and fixing the presser cylinder 6 is formed.
The presser cylinder 6 is provided with a protrusion 6a on the outer periphery of one end that engages with the engaging portion 3e of the joint body, and on the outer periphery of the other end that engages with the cylindrical flange 5a of the gripper 5. A stepped portion 6b is formed. Further, the holding cylinder 6 is fitted and fixed within the joint body 3 by, for example, press-fitting the protrusion 6a into the engaging portion 3e of the joint body 3.

As shown in the most detail in FIGS. 4 and 5, the gripping tool 5 has a toothed washer-like shape, and a cylindrical flange portion 5a is formed on the outer periphery of an annular base portion 5b. Further, on the inner periphery of the base portion 5b, a cylindrical flange portion 5a is provided which protrudes toward the center at a predetermined interval.
A plurality of claw pieces 4 are formed which are inclined toward the opposite side. Further, the cylindrical flange portion 5a is provided with a notch 5c at a rear position of each claw piece 4 from the peripheral edge side toward the inside. The gripping tool 5 is rotatable between the end surface of the presser cylinder 6 and the stepped part 3b of the joint body 3 so that its cylindrical flange 5a fits into the step part 6b of the presser cylinder 6. is interposed in. Further, the gripping tool 5 is made of an elastic material with relatively high fatigue strength, such as phosphor bronze.

When the open tube 7 is slidably fitted into the holding cylinder 6, a slope 7a is formed at the end facing the gripper 5, and the other end is used to push the open tube 7 into the joint body 3. A flange 7b serving as a pressing portion is provided.

Reference numeral 8 denotes a seal ring made of an elastic material and having a U-shaped cross section, which is fitted into the joint body 3 so as to be hooked thereon, and when the pipe body 2 is inserted into the joint body 3, Airtightness is maintained by making elastic contact with the inner wall surface 3a of the tube body 2 and the outer peripheral surface of the tube body 2. Note that the seal ring may have another shape, such as an O-ring.

Next, the operation of the above embodiment will be explained using FIGS. 2 and 3.

To attach the tube body 2 to the joint body 3, the tube body 2 is inserted into the open cylinder 7. As the tube body 2 is inserted,
The tip first contacts the claw piece 4 of the gripper 5, pushes the claw piece 4 against the elasticity of the claw piece 4 toward the inner wall surface of the joint body, and then slides onto the inner circumferential surface 8a of the seal ring 8. The pipe body 2 enters the joint body 3 while making contact with the step part 3d in the joint body 3, and the pipe body 2 enters the joint body 3.
will be installed on the That is, in this state, the claws 4 of the gripping tool 5 are in pressure contact with the tube body 2 due to their elasticity, so when an attempt is made to pull out the tube body 2, the claws 4 are pressed against the tube body 2 as shown in FIG. The tip of the tube 2 bites into the tube 2 and acts freely to prevent the tube 2 from being pulled out, thereby firmly holding the tube 2.

In addition, in order to remove the tube body 2 in the above state from the joint body 3, push the open tube 7 into the joint body 3 as shown in FIG. The tips of the claws 4 that have bitten into the tube body 2 are removed from the tube surface by pushing out the claws against their elasticity, and by releasing the bite, the tube body 2 can be easily removed from the joint body 3. It can be pulled out.

As described above, the claws 4 of the gripper 5 are subjected to bending stress by the tip of the tube 2 when it is attached, and by the slope 7a of the open tube 7 when it is removed. This bending stress increases in proportion to the usage time of this joint 1, and the frequency of repetition increases, causing the annular base 5b of the gripper 5 to
try to transform. Further, when used in an industrial robot, for example, external forces such as tension and twisting are applied to the joint portion, and the annular base portion 5b of the gripper 5 tends to deform in the same way as when attaching and detaching a tubular body. However, the annular base portion 5b between the claw pieces 4, which has conventionally been weak in strength,
Since it is reinforced by being molded integrally with the cylindrical flange portion 5a that engages with the gripping tool 5
This increases the strength and elasticity of the material, making it difficult for fatigue deformation to occur over a long period of time, and also making it difficult to permanently deform due to external forces, thereby greatly improving durability. Furthermore, since the cylindrical flange portion 5a is provided with a notch 5c at the rear position of each claw piece 4, the annular base portion 5b curves appropriately within the elastic limit when the tubular body 2 is attached and detached, which reduces the ease of attachment and detachment. There is no.

[Effect of idea]

As explained above, according to this invention, a cylindrical flange is provided on the outer periphery of the annular base as a gripping tool, and a notch is provided at the rear position of each claw of this cylindrical flange, thereby improving durability. Since the pipe joint uses a material that has increased flexibility, the service life of the pipe joint can be greatly extended compared to conventional examples without deteriorating the ease of attaching and detaching the pipe body.

Note that this invention is not limited to the above-mentioned embodiments, and various changes can be made within the technical concept of this invention.

[Brief explanation of the drawing]

Fig. 1 is a partially longitudinal side view showing an embodiment of the pipe joint according to the present invention, Fig. 2 is an explanatory cross-sectional view showing the state in which the pipe body is fitted and held in the embodiment of Fig. 1, and Fig. 3 is a pipe joint according to the present invention. FIG. 4 is a front view of the gripping tool, and FIG. 5 is a partially vertical side view of the gripping tool. 2: Pipe body, 3: Joint body, 3b, 3c, 3d:
Step part, 4: claw piece, 5: gripping tool, 5a: cylindrical flange part, 5b: annular base, 5c: notch, 6: presser cylinder, 7: open cylinder, 8: seal ring.

Claims (1)

[Scope of utility model registration request] A joint body having a hollow portion into which the pipe body is inserted; an annular gripping tool having a plurality of claws located within the joint body and inclined in a direction in which the pipe body is inserted for biting into the outer periphery of the pipe body and gripping the pipe body; and the joint body. a presser cylinder that fits inside the main body and holds the gripping tool loosely between a stepped part in the joint main body; In the pipe joint, the pipe joint is equipped with an open cylinder that releases the claws from biting into the outer periphery of the pipe body by expanding to the side, and a seal ring that comes into elastic contact with the pipe body and the inner wall of the joint body when the pipe body is inserted. has a cylindrical flange portion integrally formed on the outer peripheral side of the annular base, and has a plurality of claw pieces integrally formed on the inner peripheral side inclined toward the opposite side with respect to the cylindrical flange portion. , and a pipe joint characterized in that the cylindrical flange portion is provided with a notch from the peripheral edge side at a rear position of each claw piece.