JP5339449B2 - Air supply / exhaust pipe retaining mechanism - Google Patents

Description

The present invention forms a receiving port for connection by inserting an insertion port of another pipe into one end of a fixed-size air supply and exhaust pipe, and an insertion port for connecting by inserting into the receiving port of the other tube at the other end. It relates retaining mechanism of the formed air supply and exhaust pipe, more particularly, to a stopper only with the retaining mechanism as the number of parts that bending a flat plate with eliminating spot welding from the retaining mechanism.

  When connecting and extending an air supply / exhaust pipe, it is common to add a standard length while joining, but there is a risk that the joint may come off and cause an accident if only this extension is added. Therefore, a retaining mechanism (lock mechanism) is attached to the joint.

  In addition, this retaining mechanism can be performed with one touch when joining, and once joined, it is secured so that it does not come off unless a special operation is performed.

  For example, Japanese Patent No. 3326398 discloses a fixed-size air supply / exhaust pipe in which a receiving port is formed at one end and an insertion port is formed at the other end. In addition, a stopper is formed at the rear end, and a lock member formed with a lock portion in the front end direction and an engagement portion on the front end side from the lock portion is slidably attached in the longitudinal direction of the tube. In the state where the lock portion slides in the direction and falls in the center direction of the tube from the cut window, a lock bag wall is formed to prevent the distal end of the engagement portion from engaging from the inside and escaping in the radial direction. In addition, a circumferential groove is formed on the insertion port side so that when the receiving port of the other pipe is inserted to a predetermined position, the locking engagement portion of the lock member is depressed to prevent the locking window from falling off. After connecting the pipe When a force in the pulling direction is applied, the locking member slides in the pulling direction together with the tube, and the tip of the engaging portion of the locking member comes into contact with the locking bag wall, where the engaging portion is pressed and wedged. The pull-out strength is increased by the action of the above. On the other hand, once the insertion port side is pushed in slightly, the lock member is retracted together, and the front end of the engagement portion is released from the lock bag wall, and in this state the rear end of the lock member An air supply / exhaust pipe retaining device that can be disconnected by pulling out the insertion port side while pressing the stopper formed with the fingertip is introduced.

Japanese Patent No. 3326398

  However, in the case of the retaining device introduced in the above-mentioned Patent Document 1, the locking bag wall and the slide guide are formed by pressing, and each is spot welded to the base material. is there.

  1. In order to perform spot welding, it is necessary to prepare a spot welder, hold the locking bag wall and slide guide with one hand, hold the torch in the other hand, and perform the welding work. It takes.

  2. When spot welding is performed manually, errors are likely to occur in the mounting position.

  3. In the case of the above-mentioned patent document 1, since the number of components is at least two, this component management becomes troublesome.

  4). High cost due to spot welding and many parts.

  5. In the case of spot welding, both the parts and the base metal are easily corroded by the heat during spot welding.

  6). In the case of Patent Document 1, since the claw of the stopper (lock member) is engaged with the groove on the insertion port side, there is a concern that the claw may be deformed and the fitting (lock) may be released when a large force is applied. is there.

  7). When the stopper (locking member) is deformed and needs to be replaced, it is necessary to remove the cover (bag wall) once and then assemble the stopper and bag wall again to perform welding, which is laborious and costly. .

  An object of the present invention is to eliminate the drawbacks of the retaining device disclosed in Patent Document 1 described above.

To solve the above problems, the invention described in claim 1, to form a receptacle for receiving the insertion port side of the other tube at one end of the supply and exhaust pipes of standard length, the other for this receptacle and opposition side Connects to an air supply / exhaust pipe formed with a circular lock groove with a concave cross section on the outer peripheral surface of the insertion port, forming an insertion port for insertion into the receiving port of the tube and slightly behind the tip of the insertion port A stopper mechanism for preventing the slipping of the stopper, and forming a stopper insertion port toward the rear of the air supply / exhaust pipe by pressing the base material at the receiving port. A flat part is formed toward the front end side of the receiving port, a guide protrusion is formed at the center of the flat part, and an inclined bulging part that is raised while inclining following the flat part is formed. Continue down to the top of the ridge By forming the descending slope part, the escape space part is formed inside the top part and the stopper assembly chamber formed by forming the lock wall on the inner surface of the descending slope part is formed, and the elastic metal plate is made into a hairpin shape. Form a U-shaped curved lock portion at the tip of the lower flat plate portion located on the lower side formed by bending and bend the tip of the upper flat plate portion located on the upper side upward. By forming a claw part and forming a guide long hole into which the guide projection part of the stopper assembly chamber enters from the claw part to the rear, and further raising the portion bent into the hairpin shape upward Provided with a stopper that forms a finger hook for unlocking the stopper, the stopper comes from the stopper insertion port of the stopper assembly chamber to the bottom plate part from the lock part first. Insert the upper flat plate part into the stopper assembly chamber so that the plate thickness of the flat part of the stopper assembly chamber is sandwiched from above and below by connecting the guide projection into the guide slot along the flat part from the stopper insertion port. When the insertion port side of the other air supply / exhaust pipe is inserted into the receiving port, the U-shaped lock part of the stopper fits into the concave circumferential lock groove formed on the insertion port side of the other pipe. It is characterized in that it is prevented from coming off. According to the present invention, since there is no welded portion in the structure of the retaining mechanism, it is easy to manufacture and there is no worry of corrosion.

  According to a second aspect of the present invention, in the air supply / exhaust pipe retaining mechanism according to the first aspect, the guide projection is formed on the lower surface of the upper flat plate portion of the stopper, and the guide elongated hole is assembled to the stopper. It is formed in the flat part of a chamber, It is characterized by the above-mentioned.

  According to a third aspect of the present invention, in the air supply / exhaust pipe retaining mechanism according to the first aspect, in the stopper, the tip of the upper flat plate portion is bent upward to form a claw portion for stopper removal. Then, hook the finger on this claw and bend the guide slot from the guide projection by curving the tip side of the upper flat plate part upward, and then place the finger on the finger hook part of the stopper to retract the stopper. By doing so, the stopper can be removed from the stopper assembly chamber and replaced. According to the present invention, the stopper can be easily removed.

  According to a fourth aspect of the present invention, in the air supply / exhaust pipe retaining mechanism according to the first aspect of the present invention, the supply / exhaust pipe includes an exhaust pipe or a supply pipe or a supply pipe and an exhaust pipe of a combustion appliance. A double air supply / exhaust pipe or an exhaust pipe or air supply pipe for indoor ventilation is included.

  As described above, the present invention eliminates spot welding from the retention mechanism of the air supply / exhaust pipe, thereby eliminating the production cost problem and the corrosion problem based on the spot welding operation.

  In addition, the number of parts is only one stopper, and the labor for parts management can be reduced and the cost can be reduced.

  In addition, the stopper locking part is formed in a U-shape, and this U-shaped locking part fits into the circumferential lock groove on the insertion port side and joins on a substantially semi-circular surface, so that the lock is firmly performed. The circumferential lock groove only needs to have a semicircular cross section, and the processing accuracy of the lock groove does not have to be so high.

  In addition, since the tip of the stopper is pressed by a downwardly inclined lock wall formed in the stopper assembly chamber, when force is applied in the pull-out direction, the force is applied in the lock direction by the action of this inclined surface, and the lock strength is increased. is there.

  Also, if the stopper is deformed or damaged, it can be easily pulled out from the stopper assembly hole and replaced.

  In addition, since the stopper is assembled at the receiving port toward the inlet of the receiving port, for example, when the stopper is attached to the exhaust port of the combustion device, the stopper is located on the opposite side of the combustion device. The top plate of the combustion appliance has an effect that does not interfere when the stopper is attached or detached.

It is explanatory drawing of the air supply / exhaust pipe which implemented the retaining mechanism based on this invention. It is sectional drawing of a retaining mechanism part. It is explanatory drawing of the state which inserted the insertion port of the other pipe | tube halfway in the receiving port of the air supply / exhaust pipe. It is explanatory drawing of the state which the lock part of the stopper engaged with the circumferential lock groove of the other pipe. It is explanatory drawing of a locked state. It is explanatory drawing of the state which pulled the stopper and released the lock | rock. It is explanatory drawing of the state which cancelled | released the lock | rock and pulled out the other pipe | tube. It is explanatory drawing of the state which has made the stopper detach | leave. It is explanatory drawing of the state which attached the exhaust_gas | exhaustion pipe | tube with the retaining mechanism which implemented this invention to the exhaust port of the combustion instrument.

  Embodiments of the retaining mechanism according to the present invention described in claims 1 to 4 will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view showing an air supply / exhaust pipe and a retaining mechanism. The retaining mechanism 1 is located outside a receiving port (connecting port) 101 formed at one end of a regular air supply / exhaust tube 100. It is attached toward the tip. Then, the insertion port 102 side of another fixed-size air supply / exhaust pipe 100 is inserted into the receiving port 101. In the air supply / exhaust pipe 100, 103 is a tip of the insertion port 102, 104 is a concave circumferential lock groove into which a lock portion of a stopper described later is fitted, 105 in FIG. 2 is an outer bead, and 106 in FIG. 2 is an O-ring. .

  As shown in FIGS. 1 and 2, the retaining mechanism 1 has a stopper assembling chamber 2 formed by pressing the base material of the receiving port 101 from the inside. The stopper assembling chamber 2 has the following structure. It has become.

The distal end opposite the socket 101 stopper insertion opening 3 is formed, the flat portion 5 is formed from the stopper insertion hole 3 in the roof portion 4 of the stopper assembly chamber 2, followed roof portion 4 is gentle ascending An upward inclined surface 6 is formed in the interior by the inclination, and further, a downward inclined surface 7 is formed from the top of the upward inclined surface 6, thereby forming a relief space 8 of a stopper locking portion described later in the stopper assembly chamber 2. In addition, a lock wall (lock action surface) 10 is formed on the inner surface by a gentle inclined surface 9 following the inclined surface 7 so as to return to the base material.

  Further, a guide protrusion 11 is integrally formed on the flat portion 5 during the press working.

  Reference numeral 12 denotes a stopper. The stopper 12 is formed by folding a stainless steel flat plate into two hairpins, and the tip of the lower flat plate portion 13 is longer than the tip of the upper flat plate portion 14.

  Further, a lock portion 15 bent in a U-shape is formed at the tip of the lower flat plate portion 13, and a finger hooking claw portion 16 is formed obliquely at the tip of the upper flat plate portion 14. A guide slot 17 for engaging the guide projection 11 is formed at the rear of the portion 16, and the finger-folding portion 18 is formed by bending the bifold portion of the stopper 12 upward.

  As shown in FIG. 2, the retaining mechanism 1 having the above configuration inserts the lower flat plate portion 13 from the stopper insertion port 3 of the stopper assembly chamber 2 with the lock portion 15 side first, and at this time, the upper flat plate portion is inserted. By positioning the portion 14 on the flat portion 5 of the stopper assembly chamber 2, the flat portion 5 is sandwiched between the lower flat plate portion 13 and the upper flat plate portion 14 by the elastic action of the stopper 12, and the guide projection 11 is further inserted into the stopper 12. It engages with a guide slot 17 formed in the upper flat plate part 14.

  The assembly of the stopper 12 is now complete. Next, as shown in FIG. 3 from the state of FIG. 2, when the insertion tube 102 side of the other tube is inserted into the receiving port 101, the lock portion 15 of the stopper 12 is attached to the curved side surface. The distal end 103 on the side of the insertion port 102 comes into contact, and the lock portion 15 side of the stopper 12 escapes into the lock portion escape space 8 in the stopper assembly chamber 2 by the action of bending and elasticity. By this action, the insertion slot 102 can be inserted smoothly.

  When the circumferential lock groove 104 of the insertion port 102 comes under the lock portion 15, the lock portion 15 enters the circumferential lock groove 104 by its elastic action and is fitted. This state is shown in FIG.

  Next, in this fitted state, when the insertion port 102 side is slightly pulled in the direction of arrow a in FIG. 4, the stopper 12 moves forward slightly as shown by arrow b, and the tip 15 a of the lock portion 15 is pushed by the presser lock wall 10. By being pressed, the lock portion 15 is fitted in the circumferential lock groove 104 with a substantially semi-circumferential surface, and the withdrawal is stopped here. This state is shown in FIG.

  Next, drawing of the tube will be described with reference to FIGS. First, as shown in FIG. 6, when a finger is placed on the finger hooking portion 18 of the stopper 12 and pulled in the direction of the arrow c, the stopper 12 is slightly retracted while being guided by the guide protrusion 11 and the guide slot 14. As a result, the lock portion 15 rises from the lock circumferential groove 104, and the lock portion 15 floats in the escape space 8.

  In this state, when the insertion slot 102 side is pulled in the direction of the arrow d while the finger hook portion 18 of the stopper 12 is stopped with the fingertip, the lock portion 15 does not become an obstacle and can be pulled out as it is. This state is shown in FIG.

  Next, a case where the stopper 12 is deformed or damaged and needs to be replaced will be described. In this case, as shown in FIG. 8, first, the insertion port 102 side is slightly pushed in the direction of arrow e, the stopper 12 is pressed as shown in FIG. 7, and the insertion port 102 side is pulled out as shown in FIGS. . Then, when the finger is put on the claw portion 16 formed at the tip of the upper flat plate portion 14 of the stopper 12 and caused in the direction of the arrow f, the upper flat plate portion 15 is warped and the guide elongated hole 17 is separated from the guide projection 11. In this state, when the finger is placed on the finger hooking portion 18 of the stopper 12 and pulled in the direction of arrow g in FIG. 8, the stopper 12 can be pulled out from the stopper insertion port 3 of the stopper assembly chamber 2.

  Then, a replacement stopper is assembled as shown in FIG.

  FIG. 9 shows a case where the air supply / exhaust pipe is connected to the exhaust port 201 of the combustion appliance 200 rather than the connection between the pipes. At this time, the receiving port 101 is inserted directly over the exhaust port 201, and the retaining mechanism 1 is used to prevent the retaining port 101 from coming off. Although all the actions are the same as those of the tubes, since the finger-holding portion 18 of the stopper 12 is located farther (on the opposite side) than the top plate 202 of the combustion instrument 200, when operating this finger-hanging portion 18 with the fingertip The top plate 202 does not get in the way.

・ Combustion appliance supply / exhaust pipes ・ Air supply to the room or exhaust pipe from the room

DESCRIPTION OF SYMBOLS 1 Retaining mechanism 2 Stopper assembly chamber 3 Stopper insertion port 4 Roof part 5 Flat part 6 Up-slope surface 7 Down-slope surface 8 Lock part relief space 9 Slightly slant surface 10 Lock action surface 11 Guide protrusion 12 Stopper 13 Lower flat plate Part 14 upper flat plate part 15 lock part 16 claw part 17 guide slot 18 finger hook part

Claims (4)

a. One end of the supply and exhaust pipes of standard dimension to form a socket for receiving the insertion port side of the other pipe, the insertion with in this receptacle and opposition side forming the insertion opening for insertion into the socket of another pipe This is a retaining mechanism for retaining this when a supply / exhaust pipe formed by forming a circumferential locking groove having a concave cross section on the outer peripheral surface of the insertion opening is connected to the outer peripheral surface of the insertion opening. ,
b. A stopper insertion port is formed in the receiving port by pressing the base material toward the rear of the air supply / exhaust pipe, and a flat portion is formed from the stopper insertion port toward the distal end side of the receiving port. By forming a guide projection in the center, further forming an inclined bulging portion that is raised while inclining following this flat portion, and further forming a descending inclined portion that descends continuously at the top of this inclined bulging portion, Forming a relief space portion inside the top portion and forming a stopper assembly chamber formed by forming a lock wall on the inner surface of the descending inclined portion;
c. The elastic metal plate is bent into a hairpin shape, and a U-shaped locking portion is formed at the lower end of the lower flat plate portion formed by bending the elastic metal plate, and the upper end of the upper flat plate portion is positioned at the upper side. Is bent upwards to form a claw portion, and a guide elongated hole into which the guide projection portion of the stopper assembly chamber enters from the claw portion to the rear is formed. Further, the portion bent into the hairpin shape is Provided with a stopper formed by forming a finger hook for unlocking by standing up towards
d. The stopper is inserted into the stopper slot from the stopper insertion port of the stopper assembly chamber with the locking plate first, and the lower flat plate portion is inserted all the way into the upper flat plate portion along the flat portion from the stopper insertion port. By assembling, the plate thickness of the flat part of the stopper assembly chamber is sandwiched from above and below in the stopper assembly chamber, and when the insertion port side of the other air supply / exhaust pipe is inserted into the receiving port, The U-shaped lock part is fitted into a concave circumferential lock groove formed on the insertion port side of the other pipe to prevent it from coming off,
e. An air supply / exhaust pipe retaining mechanism.   The supply / exhaust pipe retaining mechanism according to claim 1, wherein the guide protrusion is formed on the lower surface of the upper flat plate portion of the stopper, and the guide long hole is formed in a flat portion of the stopper assembly chamber. In the stopper, the tip of the upper flat plate portion is bent upward to form a claw portion for detaching the stopper, and a finger is placed on the claw portion to bend the tip side of the upper flat plate portion upward to guide from the guide protrusion. After the long hole is removed, the stopper can be replaced by removing the stopper from the stopper assembly chamber by placing the finger on the finger hooking portion of the stopper and retracting the stopper. The supply / exhaust pipe retaining mechanism according to claim 1 or 2. The supply / exhaust pipe includes an exhaust pipe or a supply pipe or a double supply / exhaust pipe formed by duplicating an intake pipe and an exhaust pipe, or an exhaust pipe or supply pipe for indoor ventilation. supply and exhaust pipe retaining mechanism according to claim 1.

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