JP5462496B2 - Tubular universal joint - Google Patents

Description

  The present invention relates to a cylindrical universal joint that can be freely oriented in an arbitrary piping direction such as a substantially straight pipe shape or a curved pipe shape, and in particular, is connected to a connection exhaust port of a ventilator and a wall portion of a building. The present invention relates to a cylindrical universal joint effective for connection to an exhaust port.

Ventilators for indoor ventilation are known to have an opening on the wall of the building, and a wall-mounted type that can be directly attached to the opening, or an installation type that is installed inside the ceiling or wall. . In recent years, installation types have become mainstream. In this installation type ventilator, connection to an external exhaust port attached to a wall of a building is performed using an integral elbow pipe or bellows pipe.
In other words, depending on the opening direction of the connection exhaust port on the installation type ventilator side, due to the relationship with the mounting position of the external exhaust port on the wall, misalignment occurs in the connection direction between the connection exhaust port and the external exhaust port, May not match. In this case, either the elbow pipe or the bellows pipe, or a combination of the elbow pipe and the bellows pipe is used to connect the connection exhaust port and the external exhaust port.

By the way, the elbow pipe is effective as a pipe joint for indoor ventilation because there is no unevenness on the inner surface that obstructs the flow of air, but because it is a pipe joint having a fixed bending angle such as 90 °, Depending on the misalignment of the direction (center misalignment angle) and the like, not only the work becomes very difficult, but the elbow pipe alone may not be able to cope with it. In this case, it is often performed by using a combination with a bellows tube having flexibility in a direction or a single bellows tube.
In this way, the bellows pipe can be adjusted smoothly and smoothly with respect to misalignment in the connection direction between the connection exhaust port and the external exhaust port. I can say that. However, the bellows pipe has a problem that a smooth circulation of room air cannot be expected, such as a high ventilation resistance, because fine irregularities exist on the inner surface of the pipe.
In particular, when bellows pipes are used for the external piping of range hoods that exhaust contaminated air generated during cooking to the outdoors, the fat and oil contained in the contaminated air is projected to uneven projections. Repeating this collision makes it easier for oil and fat to accumulate in the pipe, which is undesirable in terms of fire safety.

Therefore, in order to solve such a problem, the inner peripheral surface does not have irregularities existing in the pipe direction at a fine pitch like a bellows pipe, and the flexibility to adjust the misalignment with respect to the connection direction is provided. Proposed joints for ventilation (see, for example, Patent Document 1)
The vent joint includes a connection port portion connected to a pipe end portion of a connection pipe by band fastening or the like, end members on both sides having semicircular ridges connected to the connection port portion, and end members on both sides The intermediate member is formed by connecting two-way semicircular ridges in the respective connecting directions that are fitted and connected to the semicircular ridges of the both end members.
As a result, the semicircular ridges of the end members on both sides and the semicircular ridges of the intermediate member are pivotally connected so that the connection ports of the end members on both sides are coaxial with the connection direction to the connection pipe. It has flexibility to adjust the alignment on the core, and the entire length can be changed depending on the number of intermediate members connected between the end members on both sides.

Japanese Utility Model Publication No. 8-525

By the way, as shown in FIG. 1 and FIG. 2 after correction, for example, the conventional technology described in Patent Document 1 is an end formed so as to overlap in the same flange part (end face) form in relation to inside and outside. This is a connecting structure in which the female semicircular ridges of the members are fitted and connected so as to cover the male semicircular ridges of the intermediate member.
For this reason, it is necessary to load a sealing material such as an O-ring for sealing between the male and female collars between the mating overlapping portions of both male and female semicircular baskets. It was time consuming.
For example, at the installation site of a range hood, a fitting connection using a plurality of intermediate members performed according to the connection length of the connection exhaust port of the hood part attached to the indoor wall surface and the external exhaust port attached to the wall part There were problems in handling such as troublesome and time-consuming work.

  In the prior art, in addition to the end members on both sides, two different types of female intermediate members and male intermediate members must be manufactured on the manufacturing surface. Further, since a sealing material such as an O-ring that fills the space between the mating overlapped parts is required as an essential part, the cost is increased due to an increase in material costs and processing costs.

  Therefore, the present invention has been developed to solve the above-mentioned problems, and it is possible to adjust the direction with respect to the misalignment in the connecting direction and to change the length, and to connect the plurality of members having the same shape in the cylinder direction. An object of the present invention is to provide a cylindrical universal joint having flexibility, which is made possible by rotation in the circumferential direction, and which further reduces the flow resistance by further smoothing the inner surface of the pipe.

In order to solve the above-mentioned problem, in the present invention, a cylindrical universal joint formed by connecting a plurality of tubular members having both ends having connection ports that are butt-coupled so as to be slidable and rotatable, in a cylindrical shape,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which both the connection ports are cut in a circular shape at an oblique angle, and each of the connection ports is provided with a butt connection portion. It is characterized by that.
Here, the tubular member is formed into a curved tubular shape in which a tube wall is curved in a desired arc shape, and both the connection ports are formed in a perfect circle shape orthogonal to the tube axis of the tubular member. Is preferable.
The butt contact portion which is the butt connection portion is provided on one of the connection ports, and the butt contact portion is closely fitted and connected to the other connection port. A configuration including a butt fitting portion that is a connecting portion, or of the tubular members that are butt-connected in a cylindrical shape and are adjacent to each other in the cylindrical direction, the butt-connecting portion is connected to both connection ports on the one tubular member side. Each butt contact portion includes a butt fitting portion that is the butt connection portion to which the butt contact portion of the one tubular member is fitted and connected to both connection ports on the other tubular member side. It is preferable to adopt the configuration.
Further, the butt contact portion is substantially L in a sectional view from a contact surface portion provided in an outward ring shape from the opening periphery of the one connection port and an inner shield surface portion provided from the outer periphery of the contact surface portion. The butt fitting portion is formed in an outward ring shape from the opening peripheral edge of the other connecting port, and the abutting surface abuts against the abutting surface, and the outer peripheral edge of the seating surface portion It is preferable that the outer shield surface portion is more generally L-shaped in cross-sectional view.
Further, the inner shield surface portion is formed to be inclined outwardly from the outer peripheral edge of the contact surface portion, and the outer shield surface portion is inclined substantially the same so as to wrap the inner shield surface portion from the outer periphery from the outer peripheral edge of the seat surface portion. It is preferable to form an outwardly inclined shape at an angle.
Furthermore, it is preferable that the outer shield surface portion further includes a fixing means for fixing the butt contact portion at least unmovably at the circumferential end of the outer shield surface portion, and the fixing means includes the outer shield surface portion. Inward locking piece portions and inward bending caulking piece portions respectively provided at essential points of the circumferential end portion of the outer shield surface, or inward locking provided at essential points of the circumferential end portion of the outer shield surface portion It is preferable that the one part and a separately formed clip member are used.

According to such a configuration, a plurality of tubular members are connected in a cylindrical shape while abutting both connecting ports cut in a diagonal ring shape of the tubular member, and each tubular member is rotated in any circumferential direction. Thus, the inner surface of the tube is smooth, and a tubular universal joint such as a straight tube shape, an elbow shape, a twisted shape, or a substantially U-shaped or substantially C-shaped shape can be arbitrarily connected and configured.
For example, in the case of constituting an elbow-shaped cylindrical universal joint, after a plurality of tubular members are butt-connected, the tubular direction shortest side of one tubular member adjacent in the tubular direction and the tube of the other tubular member By rotating each tubular member in the circumferential direction so that the direction shortest portion side is positioned in the cylindrical direction at one place in the circumferential direction, an elbow-shaped cylindrical universal joint can be obtained. In this case, the number of connections of the tubular members is determined in relation to the substantially V-shaped angle θ between the two connection ports that are cut in the shape of a diagonal ring of the tubular members. For example, when the substantially V-shaped angle θ of each tubular member is 30 °, the 90 ° elbow-shaped cylindrical universal joint is connected by butt-connecting the three annular members as described above. Can be configured.

  In addition, the butt connection between the two connection ports of the plurality of tubular members is formed so that the butt contact portion on one connection port side formed in a substantially L shape in a sectional view is also formed in a substantially L shape in a sectional view. This can be easily performed by fitting to the butt fitting portion on the other connecting port side. In addition, since both the connection ports are formed in a perfect circle, the tubular member can be smoothly rotated in a state where the butt contact portion is fitted to the butt fitting portion. That is, it is possible to smoothly perform the adjustment work for the misalignment in the piping direction in a state where the plurality of tubular members are butt-connected in a tubular shape.

Further, the two connection ports to be butt-connected can be brought into close contact with each other with high sealing properties by the inner shield surface portion on the butt contact portion side and the outer shield surface portion on the butt fitting portion side.
Furthermore, the bent caulking piece portion provided on the outer shield surface portion side is bent and caulked to the inner shield surface portion side, so that the inner shield surface portion is sandwiched. Alternatively, by fastening the inner shield surface portion and the outer shield surface portion so as to be sandwiched between the clip members, both the connection ports are formed by this fastening portion and the inwardly engaging piece portion provided on the outer shield surface portion side. It can be connected so that it cannot be pulled out and cannot rotate.

  In the present invention, in the state where a plurality of the tubular members are connected in a cylindrical shape, a connection port member is provided which is butt-connected to one or both of the tubular members located at both ends in the cylindrical direction. To do. Here, the connection port member may be of the same diameter as that of the annular member, or may be different in diameter such as larger or smaller than the diameter of the tubular member.

According to such a configuration, for example, because the piping distance between the connection exhaust port of a ventilator such as a range hood and the external exhaust port attached to the wall of the building is long, the cylinder connected to the connection exhaust port side When using a straight pipe having a desired length and diameter between the cylindrical universal joint and the cylindrical universal joint connected to the external exhaust port side, the diameter of the straight pipe is larger than the diameter of the annular member When the diameters are different, such as small, a connection port member having a diameter that can be connected to a straight pipe is selected, and the connection port member is formed as a one-end tube of a cylindrical universal joint to which the straight pipe is connected. By butt-connecting each to the member side, piping connection between the connection exhaust port of the ventilator and the external exhaust port attached to the wall of the building is made possible by a combination with a straight tube using a straight tube therebetween.
In addition, when installing a new ventilator by renovation or the like, one end tubular member of the cylindrical universal joint on the side to which the external exhaust port is connected even when the diameter of the existing external exhaust port is different It is possible to cope by connecting the connecting port member to the side.

In the present invention, in a state where the connection port having the butt contact portion and the connection port having the butt fitting portion are butt-connected, at least the outer shield surface portion of the butt fitting portion is A tightening band is provided to press-contact the inner shield surface portion of the butt contact portion.
Here, the tightening band is formed in a substantially trapezoidal shape in a cross-sectional view, and includes a tightening bolt that connects the both ends open end side so as to draw close together (the diameter of the tightening band is reduced), and has the butt contact portion. In a state where the connection port and the connection port having the butt fitting portion are butt-connected, the circumferential end portion of the inner shield surface portion protrudes outward from the circumferential end portion of the outer shield surface portion. Is suitable.

According to such a configuration, after the one connecting port having the butt contact portion and the other connecting port having the butt fitting portion are butted together, the tightening band is wound around from the outside of the outer shield surface portion. By tightening the outer seal surface portion with the tightening band, the outer shield surface portion and the inner shield surface can be pressure-bonded.
Thereby, an outer side shield surface part and an inner side shield surface part can be closely_contact | adhered with much higher sealing performance. In addition, both connection ports of the tubular members to be butt-connected can be connected in a harder state in a non-rotatable manner.

In addition, when the tightening band is formed in a substantially trapezoidal shape in a cross-sectional view spreading toward the both open ends, it is set so as to wrap the butt fitting part and the butt contact part from the outside of the outer shield surface part. By the tightening band, the butt contact portion can be integrally connected to the butt fitting portion. In other words, because the circumferential end of the inner shield surface portion protrudes from the circumferential end of the outer shield surface portion, the butt contact portion gradually moves in the butt direction with respect to the butt fitting portion by tightening the tightening band. The pressure contact force of the contact surface portion of the butt contact portion against the seat surface portion of the butt fitting portion can be increased.
Thereby, both the connection ports of the tubular member butt-connected by fitting the butt contact portion to the butt fitting portion can be connected so as not to be retractable. And the fitting pressure contact force to a butt | fitting contact | abutting part and a butt | fitting fitting part can be heightened by the clamping force of a fastening band. That is, the contact between the butt contact portion and the seat surface portion of the butt fitting portion is obtained by applying the tight sealing performance between the butt contact portion and the butt fitting portion to the pressure contact between the outer shield surface portion and the inner shield surface portion. The height can be further increased by pressing the surface portion.

According to the present invention, a plurality of tubular members having the same shape formed in a substantially V shape in a side view in the tubular direction are connected to each other in a tubular shape, and each tubular member is rotated in the circumferential direction, thereby However, it is possible to connect and configure cylindrical universal joints such as a substantially straight (straight tube) form, a substantially elbow form, and a substantially U-shaped or substantially C-shaped form. Moreover, the cylindrical universal joint of arbitrary length can be connected and comprised by the connection number of the tubular member of the same shape.
That is, as in the prior art, the direction adjustment and the length with respect to the misalignment of the piping direction at the installation site can be made variable without using end members on both sides having different shapes and without using two kinds of intermediate members. It can be set as a cylindrical type universal joint.
This makes it possible, for example, for external piping of a range hood that exhausts contaminated air generated during cooking to the outside, for connection between the connection exhaust port of the hood part and the external exhaust port attached to the wall part, or to the external exhaust port. It is possible to provide a cylindrical universal joint that is effective for connection between the other end of the exhaust duct to which one end is connected and the connection exhaust port of the hood, and is effective in handling and fire safety.

  In addition, the connection of the plurality of tubular members can be performed by fitting the butt contact portion provided on one connection port side to the butt fitting portion provided on the other connection port side. Since the mouths can be securely connected to each other on the coaxial core with high sealing performance by the inner shield surface portion on the butt contact portion side and the outer shield surface portion on the butt fitting portion side, By eliminating the need for such an O-ring, it is possible to improve the workability at the installation site of a ventilation device such as a range hood, and to provide a cylindrical universal joint that is reduced in cost. .

  Furthermore, since both the connection ports of each tubular member to be butt-connected are formed in a perfect circle, the tubular member can be smoothly rotated in a state where the butt contact portion is fitted to the butt fitting portion. That is, since the adjustment work can be smoothly performed with respect to the misalignment in the piping direction in a state where a plurality of tubular members are butt-connected in a cylindrical shape, an improvement in piping workability can be expected.

  In addition, according to the present invention, the connecting hood member is provided to butt-connect to both the connecting ports of the annular member, so that, for example, a straight pipe having a diameter different from the diameter of the annular member is interposed between the range hood When connecting pipes between the connection vents of ventilators and external exhaust vents attached to the wall of the building, etc. A pipe connection between the connection exhaust port and the external exhaust port by combination with a pipe is possible.

  Further, according to the present invention, the tightening band closely contacts the outer shield surface portion and the inner shield surface portion of the both connection ports of the tubular members to be butt-connected and the seat surface portion and the contact surface portion with a higher sealing performance. In addition, it is possible to connect both the connection ports so that they cannot be pulled out and cannot rotate in a strong state.

It is a longitudinal cross-sectional view when the straight pipe | tube form of the cylindrical type universal joint which concerns on this embodiment is seen from the side surface of a cylinder direction. 1 shows a tubular member alone, (a) is a longitudinal sectional view, (b) is a perspective view when viewed from one connecting port side, and (c) is viewed from the other connecting port side. FIG. It is a longitudinal cross-sectional view which shows a state when the connection port which has the butt | matching contact part of the other tubular member is butt-connected to the connection port which has the butt fitting part of one tubular member. It is a longitudinal cross-sectional view when the elbow form of the cylindrical type universal joint is viewed from the side surface in the cylinder direction. It is a side view when each cylindrical form when rotating each tubular member of the cylindrical type universal joint in FIG. 4 in the circumferential direction is viewed from the side in the cylindrical direction, and (a) is the cylindrical type universal joint. 1b shows a cylindrical configuration in which the extension line crossing angle between the one end opening and the other end opening is 60 °, and (b) shows that the extension line crossing angle between the one end opening and the other end opening of the cylindrical universal joint is 30 °. (C) shows a twisted cylindrical form. The example of use of a cylindrical type universal joint is shown, (a) is a perspective view when the ventilator is seen from the front side obliquely upward, and (b) is the same front view. The cylindrical type universal joint which concerns on other embodiment is shown, (a) is a longitudinal cross-sectional view when an elbow form is seen from a cylinder direction side surface, (b) is a perspective view which shows a connection port A member. (C) is a perspective view showing a connection port B member. The example of use of the said cylindrical type universal joint is shown, (a) is a perspective view when a ventilator is seen from front side diagonally upward, (b) is the side view. The other embodiment of the latching means which concerns on this embodiment is shown, (a) is a perspective view which shows a clip member, (b) is a butt | matching contact part and butt fitting part of an annular member by a clip member It is an expanded sectional view of the principal part which shows the state which fixedly connected so that rotation was impossible and was impossible to rotate. It is a longitudinal cross-sectional view when the elbow form of the cylindrical type universal joint which concerns on other embodiment is seen from the cylinder direction side surface. It is the XI-XI sectional view taken on the line of FIG. It is a perspective view which shows the fastening band which concerns on this embodiment.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings as appropriate.
FIG. 1 is a longitudinal sectional view showing a tubular universal joint according to the present embodiment in a straight pipe form, and FIG. 2 is a longitudinal sectional view and a perspective view showing a tubular member alone.

≪Configuration of cylindrical universal joint≫
As shown in FIG. 1, the tubular universal joint A is configured by connecting a plurality of tubular members 1 in a cylindrical manner.
This tubular universal joint A rotates each tubular member 1 in the circumferential direction. Further, the length can be freely determined depending on the number of connected tubular members 1, and the tubular member 1 is connected to an arbitrary tubular form such as a straight pipe form shown in FIG. 1, an elbow form or a twisted form shown in FIGS. It can be configured.

≪Configuration of tubular member≫
The tubular member 1 is formed of a nonflammable material. For example, it is formed using a steel plate made of stainless steel or zinc having a thickness of 0.6 mm or more.
This tubular member 1 is, for example, as shown in FIGS. 6 and 8 to be described later, such as a connection exhaust port 4 provided in a ventilator B such as a range hood that sucks and captures contaminated air generated during cooking and a building It is formed in a cylindrical shape with a diameter that is fitted on and connected to an external exhaust port 5 that is installed on the wall K and exhausts contaminated air to the outside.
And the tubular member 1 is substantially V-shaped in a side view in the cylindrical direction in which the connection ports 1a and 1b at both ends that are butt-coupled in a cylindrical shape are cut into a ring shape at an oblique angle with respect to the tube axis. (Substantially fan-shaped).

As shown in FIGS. 1 and 2, the tubular member 1 is formed as a curved tube having a tube wall curved at a desired arc angle, and the connecting ports 1a and 1b at both ends are orthogonal to the tube axis. It is formed in a perfect circle. Thereby, as shown to (a) of FIG. 2, the tubular member 1 has the cylindrical direction longest part L1, and on the diagonal line which passes along the opening axial center of the connection port 1b, the other side of the cylindrical direction longest part L1 Is formed in a substantially V-shape when viewed from the side in the cylindrical direction having the shortest directional curve portion L2 at the circumferential surface portion located at the center.
In this embodiment, as shown in FIG. 2A, the connecting ports 1a and 1b at both ends are connected to the tubular member 1 so that the substantially V-shaped angle θ between the connecting ports 1a and 1b at both ends is 30 °. It is open. That is, the tube wall of the tubular member 1 is formed in a curved shape at an arc angle along an arc line drawn around the intersection P shown in FIG.
Thereby, for example, as shown in FIG. 4 to be described later, the cylindrical longest curve portion L1 side and the shortest cylindrical curve portion L2 side of the three tubular members 1 are positioned in the cylindrical direction at one circumferential direction. By connecting the two connection ports 1a and 1b of each tubular member 1 to each other, the 90 ° elbow tubular universal joint A can be connected.

  In this way, one of the two connection ports 1a and 1b of the tubular member 1 having a substantially V shape in a side view in the cylindrical direction and having both connection ports 1a and 1b formed in a perfect circle (FIG. 2 ( a) a butt contact portion 2 which is a butt connection portion on the connection port 1a side on the left side of the paper surface in a), and a butt fitting which is a butt connection portion on the other (right side of the paper surface in FIG. 2A). A joint part 3 is provided.

≪Configuration of butt contact part≫
As shown in the enlarged view of FIG. 1 and FIG. 2, the butt contact portion 2 includes an abutment surface portion 2a provided in an outward ring shape from the opening periphery of the connection port 1a, and an outer periphery of the abutment surface portion 2a. It is formed in a substantially L shape in a cross-sectional view from the inner shield surface portion 2b provided in a direction inclined shape and an outward inclination shape directed toward the peripheral wall direction of the tubular member 1.

≪Configuration of butt fitting part≫
As shown in the enlarged view of FIG. 1 and FIG. 2, the butt fitting portion 3 is provided in an outward ring shape from the opening periphery of the connection port 1b, and the contact surface portion 2a on the connection port 1a side is butt contacted. And the outer shield surface portion 3b provided in an outwardly inclined manner toward the opening direction of the connection port 1b at substantially the same inclination angle so as to wrap the inner shield surface portion 2b from the outer periphery from the outer peripheral edge of the seat surface portion 3a. Are formed in a substantially L shape in sectional view.
Thus, when the butt contact portion side is butt-connected, the inner shield surface portion 2b of the butt contact portion 2 is abutted against the outer shield surface portion 3b of the butt fitting portion 3 so that the distance between the two surface portions 2b and 3b is high. It is designed to be tightly sealed.
The circumferential end portion of the outer shield surface portion 3b of the butt fitting portion 3 is provided with fastening means for fastening the butt contact portion 2 at least so that it cannot be removed.

≪Configuration of fastening means≫
The fastening means rotates a plurality of tubular members 1 in a state where the butting contact portion 2 of one connecting port 1a is butted against the butting fitting portion 3 of the other connecting port 1b, For example, in the state in which the tubular universal joint A is in the respective tubular forms shown in FIGS. 4 and 5, the butt contact portion 2 to which the tubular members 1 adjacent to each other in the tubular direction are butt coupled is a butt fitting portion. The butt contact portion 2 is fixed (fixed) to the butt fitting portion 3 so that the butt contact portion 2 does not come off from the position 3 and does not rotate carelessly in the circumferential direction.
As shown in FIGS. 1 and 2, the fastening means are an inwardly engaging piece 6 and an inwardly crimped piece 7 that are respectively provided at important points of the circumferential end of the outer shield surface portion 3 b.

  The inward locking piece portion 6 is provided with a claw piece shape having a predetermined width from the circumferential end portion of the outer shield surface portion 3b and bent inward as shown in FIGS. 2 (a) and 2 (c). It has been.

The inner bending caulking piece portion 7 has a predetermined distance from the circumferential end portion at the circumferential end portion of the outer shield surface portion 3b located diagonally from the inward locking piece portion 6 passing through the opening axis of the communication port 1b. As shown in the enlarged view of FIG. 1, the sandwiching portion 7a has a width and a length for sandwiching the inner shield surface portion 2b with the outer shield surface portion 3b when the inner bend is crimped, and the sandwiching portion 7a. And a fixed portion 7b that is continuously bent inwardly from the bottom.
The fixing portion 7b is formed on the wall surface of the annular member 1 when the inner bending caulking piece portion 7 is bent inward from the state shown in FIGS. 2 (a) and 2 (c) to the state shown in the enlarged view of FIG. Abut to bite. This prevents the caulking state of the inner bending caulking piece 7 from being inadvertently released. That is, the fixing portion 7b serves as a lock mechanism.

Further, as shown in FIGS. 1 and 2, the tubular member 1 includes a rotary operation knob 8 at the longest portion L1 on the outer peripheral surface of the tube. The rotary operation knob 8 is provided so as to protrude with a width and height that can be picked by a worker with a fingertip or the like when each tubular member 1 is rotated in the circumferential direction.
Thereby, the operativity when rotating the cylindrical tubular member 1 to the circumferential direction is improved.

Next, the connection and use of the cylindrical universal joint A using the plurality of tubular members 1 formed as described above will be briefly described.
FIG. 3 is a longitudinal sectional view showing a state when a connection port having a butt contact portion of the other tubular member is butt-connected to a connection port having a butt fitting portion of one tubular member to be butt-connected. FIG. 4 is a longitudinal sectional view showing the elbow form of the tubular universal joint, and FIG. 5 shows the tubular form when each tubular member of the tubular universal joint is rotated in the circumferential direction. FIG. FIG. 6 is a perspective view and a front view showing an example of use of the cylindrical universal joint. Here, description will be made with reference to FIG. 1 as appropriate.

First, three tubular members 1 are prepared. As shown in FIG. 3, the tubular member 1 is pulled on the inwardly engaging piece 6 of the butt fitting portion 3 of the connection port 1b of one tubular member 1 to be butt-connected in a cylindrical shape. A part of the circumference of the butt contact portion 2 of the connection port 1a of the other tubular member 1 is fitted and inserted into the butt fitting portion 3, and the entire butt contact portion 2 is butt fitted using this insertion portion as a fulcrum. It is inserted into the joint 3 (the state of the two-dot chain line in FIG. 3). In this state, the rotary operation knob 8 of the tubular member 1 is picked and the tubular members 1 are rotated in the circumferential direction, and the tubular butt connection forms of the tubular members 1 are shown in FIGS. 4 to 6. 1 and the butt contact portion 2 is butt-fitted by inward bending caulking of the inward caulking piece portion 7 provided on the butt fitting portion 3 side, as shown in the enlarged view of FIG. It is fixedly connected to the portion 3 so that it cannot be pulled out and cannot rotate.
Thereby, it has the flexibility which can be freely changed into various cylindrical forms such as the 90 ° elbow form shown in FIG. 4 and the twisted form shown in FIG. 5 respectively, and the outside on the butt fitting part 3 side. A cylindrical universal joint A having a high sealing performance by the contact of the inner shield surface portion 2b on the butt contact portion 2 side with the shield surface portion 3b and having a smooth tube inner surface can be configured.

And the cylindrical type universal joint A comprised by connecting in various cylindrical forms in this way is the number of connected tubular members 1 (in the illustrated example, as shown in FIGS. 6A and 6B). 5) and the upward connection exhaust port 4 of the ventilation device B and the lateral external exhaust port 5 attached to the wall K of the building by adjusting the direction with respect to the misalignment of the connection direction by the circumferential rotation of each tubular member 1 Can be connected directly by a group of tubular members in a gentle curved form.
Thereby, the contaminated air generated during cooking from the connection exhaust port 4 to the external exhaust port 5 can be smoothly circulated without any distribution resistance and can be exhausted from the external exhaust port 5 to the outside.

≪Configuration of cylindrical universal joint of other embodiment≫
FIG. 7 shows a cylindrical universal joint according to another embodiment in an elbow form, (a) is a longitudinal sectional view of the cylindrical universal joint, and (b) is a cylinder of the cylindrical universal joint. FIG. 8 is a perspective view showing a connection port member butt-coupled to one end side in the direction, (c) is a perspective view showing a connection port member butt-coupled to the other end side in the cylindrical direction of the cylindrical universal joint, FIG. It is the perspective view and side view which show the example of use of the cylindrical type universal joint.
In addition, as shown in FIG. 7, the tubular universal joint A-1 according to the other embodiment is connected to each tubular member 1 located at both ends in the tubular direction of the tubular universal joint A-1. A configuration is adopted in which a member (hereinafter referred to as “connection port A member”) 9 and a connection port member (hereinafter referred to as “connection port B member”) 10 are connected to each other. Since the other components are basically the same as those in the above-described embodiment, the same reference numerals are given to the same components, and redundant description is omitted.

That is, as shown in FIG. 7, the connection port A member 9 and the connection port B member 10 are respectively connected to the tubular member 1 positioned at both ends of the cylindrical universal joint A in the tubular direction.
As shown in FIG. 8, the connection port A member 8 and the connection port B member 9 are formed by connecting the connection exhaust port 4 and the external exhaust port 5 of the exhaust device B to an existing straight pipe C having a desired length and diameter. When the diameter of the straight pipe C is larger or smaller than the diameter of the tubular member 1 when connecting through the middle, the tubular universal joint A is positioned at both ends in the tubular direction when the diameter is different from the tubular member 1. Each tubular member 1 is used while being butt-connected.

  The connection port A member 9 and the connection port B member 10 are formed of a nonflammable material like the tubular member 1. The connection port A member 9 and the connection port B member 10 are formed in a cylindrical shape having a desired width as shown in FIGS. Is formed.

  In addition, although illustration is abbreviate | omitted, the diameter of the connection port A member 9 and the connection port B member 10 is not only with respect to the straight pipe C, but when exchanging the ventilation apparatus B newly in renovation etc. It is optional such as a diameter that can be fitted and connected to an exhaust port or the like.

  Then, at one end opening side of the connection port A member 9, as shown in FIG. 7B, the butt having the same form as the butt contact portion 2 provided on the one connection port 1 a side of the tubular member 1. The contact part 2-1 is provided, and the one end opening side of the connection port B member 10 is provided on the other connection port 1b side of the tubular member 1 as shown in FIG. A butt fitting portion 3-1 having the same form as the butt fitting portion 3 is provided. Further, the butt fitting portion 3-1 is provided with an inward locking piece portion 6 that is a fastening means and an inward bending caulking piece portion 7.

Next, the use of the cylindrical universal joint A-1 including any one of the connection port A member 9 and the connection port B member 10 formed as described above will be briefly described.
As shown in FIG. 8, a cylindrical universal joint A-1 connected to the connection exhaust port 4 of the ventilator B and a cylindrical universal joint A-1 connected to the external exhaust port 5 side are prepared. Then, the connection port A member 9 and the connection port B member 10 having a diameter that can be connected to the straight pipe C are butt-coupled to the tubular member 1 at one end in the cylindrical direction of the universal joint A-1.
After connecting to the straight pipe C by the connection port A member 9 and the connection port B member 10 of both the universal joints A-1, the cores in the connection direction by the circumferential rotation of the tubular members 1 of the both universal joints A-1. By adjusting the displacement, the upward connection exhaust port 4 of the ventilation device B and the lateral external exhaust port 5 attached to the wall K of the building can be connected.
Thereby, when the diameter of the straight pipe C is larger or smaller than the diameter of the annular member 1, the connection port A member 9 and the connection port B member having a diameter that can be connected to the straight pipe C. 10 is prepared, and the connection port A member 9 and the connection port B member 10 are respectively connected to the one end side tubular member 1 of both cylindrical universal joints A-1 to which the straight pipe C is connected. The combination with the pipe C enables the pipe connection between the connection exhaust port 4 of the ventilation device B and the external exhaust port 5 attached to the wall K of the building.
Further, when the new ventilation device B is installed by reforming or the like, the cylindrical universal joint A-1 on the side to which the external exhaust port is connected even when the diameter of the existing external exhaust port is different. It is possible to correspond by connecting the connection port A member 9 or the connection port B member 10 to the one end side tubular member 1.

<< Configuration of Fastening Means According to Other Embodiments >>
FIG. 9 is a perspective view showing another embodiment of the fastening means according to this embodiment and an enlarged cross-sectional view of the main part.
In this embodiment, as described above, after connecting one connecting port 1a having the butting contact portion 2 of the tubular member 1 to the other connecting port 1b having the butting fitting portion 3, both connecting ports 1a, An inward locking piece portion 6 provided separately on the outer shield surface portion 3b of the butt fitting portion 3 of the other connection port 1b is separately provided as a fixing means for fixing the 1b unmovably and non-rotatably. The clip member 11 is formed. That is, the outer shield surface portion 3b of the butt fitting portion 3 is provided with only the inward locking piece portion 6 and the inner bending caulking piece portion 7 is not provided.

≪Configuration of clip member≫
As shown in FIG. 9, the clip member 11 includes a pair of sandwiching piece portions 11 a and 11 b. Then, as shown in FIG. 9B, when one of the sandwiching piece portions 11a is attached so as to sandwich the inner shield surface portion 2b and the outer shield surface portion 3b between the pair of sandwiching piece portions 11a and 11b, The fixed piece portion 12 that comes into contact with the shield surface portion 2b is cut and raised so as to be inclined.
That is, the fixed piece 12 serves as a locking mechanism so that the clip member 11 is not accidentally removed.

≪Configuration of cylindrical universal joint of other embodiment≫
FIG. 10 and FIG. 11 are longitudinal sectional views showing a cylindrical universal joint according to another embodiment in an elbow form.
The tubular universal joint A-2 according to this other embodiment is tightened as shown in FIGS. 10 and 11 in place of the inward locking piece 6 and the inward bending crimping piece 7. The band 70 is used to enhance the sealing performance of both the connection ports 1a and 1b of the tubular member 1 and to connect the both connection ports 1a and 1b so that they cannot be removed and rotated. Yes. Since the other components are basically the same as those of the above-described embodiment, the same reference numerals are given to the same components, and redundant description is omitted.

  That is, the inward locking piece 6 and the inward bending crimping piece 7 are eliminated from the outer shield surface portion 3b of the butt fitting portion 3 provided on the other communication port 1b side of the cylindrical member 1, and FIG. 10 and FIG. As shown, the outer shield surface portion 3b is tightened from the outside using a tightening band 70 in a state where both the communication ports 1a and 1b are abutted.

≪Configuration of tightening band≫
FIG. 12 is a perspective view showing a fastening band according to the present embodiment. Here, description will be made with reference to FIGS. 10 and 11 as appropriate.
As shown in FIG. 12, the tightening band 70 includes a band portion 70 a and a tightening bolt 70 b that connects the both ends open side of the band portion 70 a so as to be drawn.

As shown in FIGS. 10 and 11, the band portion 70a is long enough to be wound around the entire circumference of the outer shield surface portion 3a along the outer side of the outer shield surface portion 3b. The butt contact portion 2 can be surrounded from the shield surface portion 3b side, and is formed in a substantially U shape in a sectional view.
In this embodiment, as shown in FIG. 10, the cross-sectional shape of the band portion 70 a is changed from the continuous portion having a width substantially equal to the cross-sectional width of the outer shield surface portion 3 b of the butt fitting portion 3 to both open end sides. It has a substantially trapezoidal shape that spreads toward the end.
Thus, the band portion 70a can be quickly set from the outer shield surface portion 3b side to the butt fitting portion 3 to which the butt contact portion 2 is butt-connected.
Furthermore, in addition to the press contact of the outer shield surface portion 3b to the inner shield surface portion 2b, as shown in the enlarged view of FIG. 10, the circumferential end portion 2b-- of the inner shield surface portion 2b from the circumferential end portion 3b-1 of the outer shield surface portion 3b. By tightening the band portion 70a, the butt contact portion 2 is gradually moved in the butt direction with respect to the butt fitting portion 3, and the butt contact portion 3a of the butt fitting portion 3 with respect to the seat surface portion 3a is tightened. The pressure contact force of the contact surface portion 2 a of the contact portion 2 is increased so that a higher sealing property can be provided between the butt contact portion 2 and the butt fitting portion 3.

  As shown in FIG. 12, substantially L-shaped tightening connecting members 71 and 72 are provided on both ends open side of the band portion 70 a, respectively, and tightening is performed between the two tightening connecting members 71 and 72. The bolt 70b is formed so as to be screwed and attached in a penetrating manner.

  The tightening bolt 70b includes a head 70b-1 and a threaded portion 70b-2 extending between the tightening connecting members 71 and 72. A slipper made of knurl or the like is provided on the peripheral surface of the head 70b-1, and a locking recess for a hexagon wrench (not shown) is provided on the protruding end surface of the head 70b-1.

Next, the connection of the cylindrical universal joint A-2 including the fastening band 70 formed in this way will be briefly described. Here, description will be made with reference to FIGS. 4 to 6 as appropriate.
This tubular universal joint A-2 has a butt contact portion 2 of the connection port 1a of the other tubular member 1 connected to a butt fitting portion 3 of the connection port 1b of one tubular member 1 which is butt-connected in a cylindrical shape. In this state, the fastening band 70 is set. At this time, the tightening bolt 70b is temporarily fixed, the rotary operation knob 8 of the tubular member 1 is picked, the tubular members 1 are rotated in the circumferential direction, and the tubular butt connection form of each tubular member 1 is Various tubular forms shown in FIGS. 4 to 7 are used. That is, after the adjustment of adjusting the core misalignment in the piping direction, the fastening bolt 70b is finally tightened.
As a result, the butt contact portion 2 cannot be removed from the butt fitting portion 3 and cannot rotate in a state in which the outer shield portion 3b of the butt fitting portion 3 is crimped to the inner shield surface portion 2b of the butt contact portion 2. Can be fastened and connected.

The specific configuration of the embodiment of the present invention is not limited to the above-described embodiment, and there are design changes and the like without departing from the gist of the present invention described in claims 1 to 9. Are also included in the present invention.
For example, as a butt connection portion provided in each of the connection ports 1a and 1b of the substantially V-shaped tubular member 1 in a side view in the cylindrical direction, among the tubular members 1 that are butt-connected in a cylindrical shape and are adjacent in the cylindrical direction, Both the connection ports 1a and 1b on the one tubular member 1 side are respectively provided with the above-described butting contact portions 2, and the both connection ports 1a and 1b on the other tubular member 1 side are respectively provided with the above-mentioned butting fitting portions 3 respectively. It can be set as the tubular member 1 of the structure provided. That is, the tubular member 1 includes a male side tubular member having a butt contact portion 2 at both connection ports 1a and 1b, and a female side tubular member having a butt fitting portion 3 at both connection ports 1a and 1b. These two types of male side tubular members and female side tubular members are alternately butted and connected in the cylindrical direction, so that the straight pipe form and elbow form tubular mold shown in FIGS. 1 and 4 are used. The universal joint A can be connected and configured.

  In addition, a mark such as an angle memory for visually confirming the rotation angle of each tubular member 1 can be provided on the outer peripheral surface of the rim of each of the connection ports 1a and 1b of each annular member 1. For example, the elbow-shaped tubular universal joint A illustrated in FIG. 4 is used as a basic form, and in this elbow form, both connecting ports located at the longest cylindrically-curved portion L1 or the shortest-curved cylindrical portion L2 of each tubular member 1 Provided with a mark indicating zero rotation (rotation base point) on the outer peripheral surface of the lip of 1a, 1b, and a mark for adjusting the rotation angle for changing the cylindrical universal joint A from this state to each form shown in FIG. It can be provided on the outer peripheral surface of the mouth edge of both connection ports 1a, 1b.

When a tubular universal joint having a desired length is configured by butt-connecting a plurality of tubular members 1 in the tubular direction, the connection exhaust port 4 of the ventilator B, the external exhaust port 5 and the intermediate pipe The cylindrical connection port members described above can be integrally provided on the respective tubular members 1 located at both ends in the cylindrical direction where the fitting connection with the tube C or the like is performed.
In this case, the tubular member 1 provided with the connection port member is butt-connected to one end side or both end sides in the cylinder direction when connecting and configuring the cylindrical universal joint. It is used as a connection end member that is fitted and connected to the exhaust port 5 and the straight pipe C in the middle of the pipe.

  Furthermore, the inward locking piece portion 6 and the inward bending crimping piece portion 7 can be provided not only in one place on the circumference of the outer shield surface portion 3b but also in several places. For example, inward bending caulking pieces 7 are provided at one place, inwardly engaging piece parts 6 are provided at two places at equal intervals in the circumference, or inward bending caulking pieces 6 are provided at one place. The pieces 7 can be provided at two equal intervals around the circumference. Furthermore, the inward locking piece portion 6 and the inward bending caulking piece portion 7 can be respectively provided at two equal intervals in the circumference.

A Tubular universal joint 1 Tubular member 1a, 1b Connection port 2 Butt contact part (butt connection part)
2a Contact surface part 2b Inner shield surface part 2b-1 Circumferential end part 3 Butt fitting part (butt joint part)
3a Seat surface portion 3b Outer shield surface portion 3b-1 Circumferential end portion 4 Connection exhaust port 5 External exhaust port 6 Inward locking piece (fixing means)
7 Inner bending caulking piece (fastening means)
8 Rotation knob 9 Connection port A member (connection port member)
10 Connection Port B Member (Connection Port Member)
11 Clip member (fastening means)
70 Tightening band

Claims (15)

A tubular universal joint formed by connecting a plurality of tubular members that have connecting ports that are butt-coupled so as to be slidable and rotatable at both ends,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which both the connection ports are cut into oblique ring shapes, and each of the connection ports is provided with a butt connection portion ,
The butt connection portion is a butt contact portion formed on the one connection port side, a butt fitting portion formed on the other connection port side and the butt contact portion is fitted and connected,
The butt contact portion is substantially L-shaped in cross-section from a contact surface portion provided in an outward ring shape from the opening periphery of the one connection port and an inner shield surface portion provided from the outer periphery of the contact surface portion. Formed into a shape,
The butt fitting portion is provided in an outward ring shape from the opening periphery of the other connecting port, and the abutment surface portion is abutted against and abutted, and the outer shield surface portion is provided from the outer periphery of the seat surface portion. And a cylindrical universal joint characterized in that it is formed in a substantially L shape in cross-sectional view . A tubular universal joint formed by connecting a plurality of tubular members that have connecting ports that are butt-coupled so as to be slidable and rotatable at both ends,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which both the connection ports are cut into oblique ring shapes, and each of the connection ports is provided with a butt connection portion,
Of the tubular members that are butt-coupled in a cylindrical shape and are adjacent to each other in the tubular direction, the butt-connecting portions are formed at both connection ports on the one tubular member side, and on the other tubular member side A butt fitting portion that is formed at both connection ports and the butt contact portion of the one tubular member is fitted and connected;
The butt contact portion is substantially L-shaped in cross-section from a contact surface portion provided in an outward ring shape from the opening periphery of the one connection port and an inner shield surface portion provided from the outer periphery of the contact surface portion. Formed into a shape,
The butt fitting portion is provided in an outward ring shape from the opening periphery of the other connecting port, and the abutment surface portion is abutted against and abutted, and the outer shield surface portion is provided from the outer periphery of the seat surface portion. And a cylindrical universal joint characterized in that it is formed in a substantially L shape in cross-sectional view . A tubular member having a connection port that is butt-coupled so as to be slidably rotatable, and a tubular type universal joint formed by connecting a connection port member in a tubular shape to one or both of the tubular members,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which the both connection ports are cut in an oblique ring shape,
The butt contact part is a cross-section from a contact surface part provided in an outward ring shape from the opening periphery of the connection port of the tubular member or the connection port member, and an inner shield surface part provided from the outer periphery of the contact surface part. It is formed in a substantially L-shape when viewed,
The butt fitting portion is formed in an outward ring shape from the opening periphery of the connection port of the tubular member or the connection port member, and a seat surface portion where the abutting surface portion abuts and abuts, and an outer periphery of the seat surface portion. The outer shield surface portion provided is formed in a substantially L shape in cross-sectional view,
When the butt contact portion is formed in the connection port of the tubular member connected to the connection port member, the connection port of the connection port member has the butt fitting portion and is connected to the connection port member. When the butt fitting portion is formed in the connection port of the tubular member, the butt contact portion is provided in the connection port of the connection port member, and the butt contact portion and the butt fitting portion And a cylindrical universal joint characterized by being connected to each other . A tubular member having a connection port that is butt-coupled so as to be slidably rotatable, and a tubular type universal joint formed by connecting a connection port member in a tubular shape to one or both of the tubular members,
The tubular member is formed in a substantially V shape in a side view in a cylindrical direction in which the both connection ports are cut in an oblique ring shape,
The butt contact part is a cross-section from a contact surface part provided in an outward ring shape from the opening periphery of the connection port of the tubular member or the connection port member, and an inner shield surface part provided from the outer periphery of the contact surface part. It is formed in a substantially L-shape when viewed,
The butt fitting portion is formed in an outward ring shape from the opening periphery of the connection port of the tubular member or the connection port member, and a seat surface portion where the abutting surface portion abuts and abuts, and an outer periphery of the seat surface portion. The outer shield surface portion provided is formed in a substantially L shape in cross-sectional view,
When the butt contact portion is formed at both the connection ports of the tubular member connected to the connection port member, the connection port of the connection port member has the butt fitting portion, and the connection port member In the case where the butt fitting portions are formed at both the connection ports of the tubular member to be connected, the butt contact portion is provided at the connection port of the connection port member, and the butt contact portion and the butt fitting are provided. A cylindrical universal joint characterized in that a joint is butt-connected . The inner shield surface portion is formed to be inclined outward from the outer peripheral edge of the contact surface portion, and the outer shield surface portion is inclined at substantially the same inclination angle so as to wrap the inner shield surface portion from the outer side from the outer peripheral edge of the seat surface portion. The cylindrical universal joint according to any one of claims 1 to 4, wherein the cylindrical universal joint is formed in an outwardly inclined shape . Before SL two joining port, tubular type universal joint according to any one of claims 1 to 5, characterized in that it is formed in a circular shape. The tubular member is formed into a curved tubular shape having a tube wall curved in a desired arc shape, and both the connection ports are formed in a perfect circle shape perpendicular to the tube axis of the tubular member. The cylindrical universal joint according to any one of claims 1 to 6 . The circumferential edge portion of the outer shield surface, according to claim 7 that claim 1, characterized in that fastening means for fastening the abutting contact portion so as not to at least抜動is provided Cylindrical universal joint.   9. The cylindrical shape according to claim 8, wherein the fixing means are an inwardly engaging piece portion and an inwardly crimped piece portion respectively provided at essential points of the circumferential end portion of the outer shield surface portion. Type universal joint.   The fastening means is a clip member that sandwiches and fastens the inwardly-engagement locking piece portion provided at a key portion of the circumferential end portion of the outer shield surface portion, and the outer shield surface portion and the inner shield surface portion. The cylindrical universal joint according to claim 8, wherein the cylindrical universal joint is characterized in that: In a state where the connection port having the butt contact portion and the connection port having the butt fitting portion are butt-connected, at least the outer shield surface portion of the butt fitting portion is at least the butt contact portion of the butt contact portion. The cylindrical universal joint according to any one of claims 1 to 10, further comprising a tightening band that is pressed against the inner shield surface portion.   The tightening band is formed in a substantially trapezoidal shape in a cross-sectional view that widens toward both open ends, and the connection port having the butt contact portion and the connection port having the butt fitting portion are butted together. The cylindrical universal joint according to claim 11, wherein, in a connected state, a circumferential end portion of the inner shield surface portion protrudes outward from a circumferential end portion of the outer shield surface portion. The connection port member is provided in one or both of the said tubular member located in the both ends of a cylinder direction in the state which made the said tubular member butt-jointly join in the cylinder shape, and 3 or 4 characterized by the above-mentioned. The cylindrical universal joint according to any one of claims 1 to 12, excluding .   The tubular universal joint according to any one of claims 1 to 13, wherein the tubular universal joint is formed into an elbow-shaped tubular shape by butt-joining three tubular members.   The tubular universal joint according to any one of claims 1 to 14, wherein the tubular member is made of a non-combustible material.

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