JPH0611083A - Universal joint - Google Patents

Abstract

PURPOSE:To facilitate connection and disconnection, and secure sufficient connection strength of a universal joint wherein a linear second member is connected to a linear first member in a relatively rotatable manner. CONSTITUTION:A cylindrical part of a second member is rotatably fitted to a small diameter part 11 of a first member. A screw cylinder 13 rotatably fitted to the first member is screwed with the cylindrical part of the second member. An inserting cylindrical part 23 provided on the second member is inserted between the screw cylinder 13 and the small diameter part 11. One end of a ring cylinder 3 arranged between the screw cylinder 13 and the inserting cylindrical part is compressed and deformed to an inner peripheral side and engaged with a circular groove 15 formed on the small diameter part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a so-called universal joint for rotatably connecting pipes and shafts.

[0002]

2. Description of the Related Art In a gas cock, a universal joint is employed at a connecting portion to a gas pipe in order to adjust its mounting posture. This type of conventional universal joint
As shown in Fig. 1 or Fig. 2, the connecting screw (2) for connecting the gas pipe of the cock body (1) is made to circumscribe around the tubular part on the cock body (1) side, and the connecting screw (2) Connect the gas pipe to. In the former case, the split ring R is interposed between the annular groove formed on the outer circumference of the cylinder portion of the cock body (1) and the annular groove formed on the inner circumference of the connection screw (2). In this type, a method is used in which the tip of a setscrew N in which the connection screw (2) is screwed through in the radial direction is fitted and engaged in an annular groove on the cock body (1) side.

In these devices, the connection screw (2) is rotatable with respect to the cock body (1), and moreover, the connection screw (2) is attached in a retaining state. Therefore, the gas pipe is screwed into the connection screw (2). Once connected, the mounting position of the cock body (1) can be adjusted. However, in the former one, the connection screw
The removal of (2) is troublesome, and the above removal is practically impossible. In the latter case, when a force such as a prying force is applied to the connection screw (2), it is only partially engaged with the attaching portion of the set screw N in a retaining state, and moreover, the set screw N is Due to the concentrated load, the connection strength between the connection screw (2) and the cock body (1) becomes insufficient.

The present invention has been made in view of the above point, and in a "universal joint for connecting a linear second member to a linear second member so as to be rotatable relative to each other", connection and disconnection can be performed. The task is to ensure a simple and sufficient bond strength.

[0005]

[Technical Means] The technical means of the present invention for solving the above-mentioned problem is to "form a small diameter portion (11) at the tip portion of the first member (A) and to form a collar portion (12) from the inner peripheral side at one end. Screw cylinder with overhang (13)
The collar portion (12) is rotatably fitted onto the base end portion of the small diameter portion (11), and an annular groove (15) is formed on the outer periphery of the small diameter portion (11) closer to the tip end than the collar portion (12). ) To form the brim (12)
And a ring tube (3) made of thin-walled metal whose width is equal to or slightly shorter than the distance between the side wall (16a) on the tip side of the annular groove (15).
In such a manner that one end is in contact with the collar portion (12), the small diameter portion (1
1), and the above-mentioned small diameter part is attached to the tip of the second member (B).
In addition to forming a connecting cylinder portion (21) that is rotatably fitted on (11), and forming a screw portion (22) screwed into the screw cylinder (13) at the tip of this connecting cylinder portion (21). An insertion cylinder portion (23) is provided which is inserted between the screw cylinder (13) and the small diameter portion (11) and whose inner peripheral surface is in close contact with the outer peripheral surface of the small diameter portion (11).
Tapered surface that expands the inner peripheral surface of the tip of (23) toward the tip (24)
It was that.

[0006]

The above technical means operates as follows. Small diameter part
The connecting cylinder part of the second member (B) is attached to the screw cylinder (13) externally fitted to the (11).
When you screw in (21), the insertion tube (23) will
It invades between (11). Here, a ring tube (3) is interposed between the collar portion (12) and the side wall (16a) on the tip side of the annular groove (15), one end of which is opposed to the collar portion (12). The tapered surface (24) of the insertion cylinder (23) is in contact with the tip of the ring cylinder (3). This tapered surface (24) has a shape that expands toward the tip side, and the width of the ring tube (3) is such that the collar portion (12) and the annular groove (15) are wide.
Since it is set to match the space with the side wall (16a) on the tip side of the ring or slightly shorter than that, the end of the ring cylinder (3) that contacts the tapered surface (24) by the screwing and the vicinity thereof. Will be pushed to the inner side over the entire circumference,
The entire circumference of this end portion faces the side wall (16a).

As a result, the ring cylinder (3) has a small diameter portion (11).
In the direction of the tip side of the first side due to the engagement with the side wall (16a).
The screw cylinder (13) is engaged with the ring cylinder (3) while being retained by the member (A). Therefore, the second member (B) screwed to the screw cylinder (13) is the flange portion (12) of the screw cylinder (13) → the ring cylinder (3).
→ The side wall (16a) is connected to the first member (A) in a retaining state with respect to the path. The connecting cylinder part (21) and the screw cylinder (13) are small diameter parts.
Since it is rotatably fitted to (11), the first member (A) and the second member (B) are rotatably connected to each other while maintaining the retaining state. Becomes

When the screw portion (22) and the screw cylinder (13) are unscrewed, the second member (B) is disengaged from the first member (A).

[0009]

[Effect] The connecting cylinder (2) of the second member (B) is connected to the screw cylinder (13).
Simply screw in the screw part (22) of 1) and the second member (B)
Since it is rotatably connected to the member (A) and the second member (B) is disengaged from the first member (A) simply by unfastening this screw,
It is easy to connect and disconnect the first member (A) and the second member (B).

Further, when connected in the retaining state, the entire circumference of the end of the ring tube (3) engages with the flange portion (12) and the side wall (16a), so that the retaining strength is sufficient. .

[0011]

Embodiments of the present invention described above will now be described in detail with reference to the drawings. In this embodiment, as shown in FIG.
There is a member (A) as the cock body (1) of the gas cock,
Connect the second member (B) to the connecting screw on the cock body.
It is as (2). Since both of them are constituent parts of the gas circuit, the airtightness of the connecting part is ensured.

The small-diameter portion (11) protruding from the tip of the cock body (1) has an annular groove (15) formed at a position spaced from the boundary end face (14) of the base end thereof by a predetermined distance. Further, a pair of annular groove portions (17) (17) accommodating the O-ring (4) are formed on the tip side. Screw tube (13) that fits over this small diameter part (11)
Is a cylindrical body with a flange portion (12) protruding from one end to the inner peripheral side, a female screw (18) is formed on the inner peripheral side of this cylindrical body, and the female screw (18) and the small diameter portion ( A constant annular gap is formed between the outer circumference of 11).

The collar portion (12) is externally fitted to the small diameter portion (11) so that its end surface is in contact with the boundary end surface (14). The collar portion (12) and the annular groove ( 15), a constant space is provided between the side wall (16b) on the base end side of the small diameter portion (11) of the annular groove (15) and the collar portion (12), and the small diameter portion is formed in the middle portion. A tapered surface (T) is formed which slightly expands toward the base end side of (11). Therefore, the diameter of the small diameter portion (11) on the base end side is slightly larger than the diameter on the tip end side of the taper surface (T), and the collar portion (12) is almost densely outside the outer diameter. Fit.

The connecting screw (2) has a hexagonal nut portion (20) serving as a gas pipe connecting portion, followed by a connecting tube portion (21) protruding from the connecting tube portion (21) at the base end side with respect to the middle. , O in the small diameter part (11)
The ring (4) is fitted onto the mounting portion of the (4). And, the tip side thereof is an insertion tube portion (23) having a smaller diameter than the above portion,
The male screw part formed on the outer peripheral part of this insertion cylinder part (23) is the screw part.
(22), which is screwed into the female screw (18) of the screw cylinder (13).

The inner peripheral surface from the tip of the insertion tube portion (23) to the middle thereof is a gently tapered surface (24) which expands toward the tip. Then, when it is screwed into the female screw (18) of the insertion tube portion (23), the small diameter end of the tapered surface (24) is changed to the small diameter portion (11).
So that it is located in the annular groove (15) formed in
The formation position of (15), the protruding length of the insertion cylinder part (23) and the screwing amount into the screw cylinder (13) are determined. Further, the depth of the annular groove (15) is made to substantially match the plate thickness of the ring cylinder (3) described later, or set to be slightly deeper than this.

As shown in FIG. 4, the ring cylinder (3) has a plate thickness
There is an endless belt-shaped ring made of brass metal plate of about 0.1 to 0.4 mm.
It is set to be slightly smaller than the distance between the collar portion (12) and the side wall (16a) in a state where it is externally fitted to 1) and is in contact with the boundary end surface (14). Further, the inner peripheral diameter thereof is set to be larger than the diameter of the taper surface (T) on the tip side of the small diameter portion (11) and smaller than the diameter of the taper surface (T) on the base end side.

[0017] The cock body (1) and the connection screw (2) having the above structure
In order to connect the and the so that they cannot be pulled out, the collar portion (12) of the screw body (13) is first fitted onto the small diameter portion (11) of the cock body (1) and the collar portion (12) is attached to the boundary end surface (14). ). Then, the small diameter part (1
Fit the ring tube (3) from the tip side of (1) so that part of the ring tube (3) is forcibly and tightly fitted between the tapered surface (T) and the brim (12). Press into. At this point, the ring tube (3) may be forcibly pushed in by a tubular tool or the like when the ring tube (3) coincides with the tapered surface (T). In this press-fit state,
One end of the ring tube (3) is in contact with the collar (12) and the other end is the side wall.
The side wall (16b) is located slightly closer to the side wall (16b) than the side (16a).

Then, the O-ring (4) is fitted into the groove portions (17) (17), the connecting cylinder portion (21) of the connecting screw (2) is fitted onto the small diameter portion (11), and the insertion cylinder portion ( Screw 23) into screw cylinder (13). As a result, the distal end of the ring tube (3) is compressed and deformed by the tapered surface (24) so as to reduce the diameter by the above-described action, and the distal end is sunk into the annular groove (15) to form the side wall. Opposite (16a). As a result, the connection screw (2) is connected by screwing with the screw cylinder (13), and the ring cylinder (3) and the side wall (16) are connected.
The connection screw (2) is rotatably connected to the cock body (1) while being retained by the engagement with a) and the engagement between the collar portion (12) and the ring tube (3).

Since the inner peripheral diameter of the connecting cylindrical portion (21) including the insertion cylindrical portion (23) is substantially equal to the outer peripheral diameter of the small diameter portion (11),
When the tip of the ring tube (3) is pushed in beyond the small diameter end of the tapered surface (24), the tip of the ring tube (3) immerses in the annular groove (15) over the entire circumference. However, since the depth of this annular groove (15) is set to be slightly deeper than the plate thickness of the ring cylinder (3), when the connecting screw (2) is subjected to an axial pull-out force. The cross section of the ring cylinder (3) housed in the annular groove (15) is less likely to buckle.

In the case of this embodiment, the connection screw (2)
The O-rings (4) and (4) ensure airtightness between the and the cock body (1) and the fitting part, but the close contact between the ring cylinder (3) and the tapered surface (T) and the ring cylinder (3). The close contact with the taper surface (24) also ensures the airtightness of the fitting portion between the two. That is,
Airtightness is secured by metal touch. In the above embodiment, the gas circuit was connected, but it can be used as another pipe joint, and the present invention can also be used for connecting a shaft body other than the annular member.

Further, in this embodiment, the male screw portion formed on the outer peripheral surface of the connecting cylinder portion (21) is screwed onto the inner peripheral surface of the screw cylinder (13). The insertion cylinder part (23) having the tapered surface (24) may be provided separately from the screw fitting part with the part (21). Further, the annular groove (15) is formed by the side wall (16a).
The cross section may be triangular as long as

[Brief description of drawings]

FIG. 1 is an explanatory diagram of a conventional example.

FIG. 2 is an explanatory diagram of another conventional example.

FIG. 3 is an explanatory diagram of an embodiment of the present invention.

FIG. 4 is an explanatory view of a ring tube (3)

[Explanation of symbols]

 (A) ・ ・ ・ 1st member (11) ・ ・ ・ Small diameter part (12) ・ ・ ・ Collar part (13) ・ ・ ・ Screw cylinder (15) ・ ・ ・ Annular groove (16a) ・ ・ Side wall (3) ... Ring tube (B) ... Second member (21) ... Connection tube part (22) ... Screw part (23) ... Insertion tube part (24) ... Tapered surface

Claims (3)

[Claims] 1. A universal joint in which a linear second member is coaxially connected to a linear first member so as to be rotatable relative to the linear first member, and a small diameter portion (11) is provided at a tip end portion of the first member (A). Formed, the collar portion (12) of the screw cylinder (13) with the collar portion (12) protruding from the inner peripheral side at one end is rotatably fitted to the proximal end portion of the small diameter portion (11), An annular groove (15) is formed in the outer periphery of the small diameter portion (11) on the tip side of the collar portion (12), and the collar portion (12) and the annular groove are formed.
A thin metal ring cylinder (3) having a width that is equal to or slightly shorter than the side wall (16a) on the tip side of (15) is arranged so that one end of the ring cylinder (3) is in contact with the collar portion (12). A connecting cylinder part (21) is fitted on the small diameter part (11), and at the tip of the second member (B) is rotatably fitted on the small diameter part (11). A screw part (22) to be screwed into the screw cylinder (13) is formed at the tip of the part (21), and the inner peripheral surface is inserted between the screw cylinder (13) and the small diameter part (11). A universal joint in which an insertion tube portion (23) that is substantially in close contact with the outer peripheral surface of the portion (11) is provided, and the inner peripheral surface at the tip of the insertion tube portion (23) is a tapered surface (24) that expands toward the tip. 2. The first member (A) and the second member (B) are both pipe members, and an airtight means is interposed between the small diameter portion (11) and the connecting cylinder portion (21). Universal joint described. 3. The universal joint according to claim 2, wherein the ring cylinder (3) is tightly fitted onto the small diameter portion (11).