JP2010169110A - Slip-off prevention device of intake and exhaust pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a slip-off prevention device of an intake and exhaust pipe, which is simple in processing and assembly without welding. <P>SOLUTION: In the slip-off prevention device, a cover 5 is integrally formed in a receiving opening 2 by press working from inside, and a stopper 6 is slidably assembled in the cover 5. By inserting an inserting opening 3 into the receiving opening 2, a pawl 16 of the stopper 6 is gotten free upward in the cover 5 to allow the inserting opening 3 to enter. When attempting to pull out the inserting opening 3, the pawl 16 is engaged with an inner groove 3b formed at the inserting opening 3 side to prevent the slip-off. When pulling out the inserting opening 3, the lock can be released by pushing the stopper 6. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a retaining device for a regular air supply / exhaust pipe in which a receiving port is formed at one end and an insertion port is formed at the other end.

Conventional technology

  If the exhaust pipe of a combustion appliance is formed by adding a standard air supply / exhaust pipe, if the connecting part that is added carelessly falls off or loosens, the exhaust gas will leak from here, which is dangerous. A retaining device is provided so as not to come off.

  This retaining device is configured so that it can be locked by simply inserting it when connecting a pipe, and can be easily unlocked when it becomes necessary to pull it out for some reason.

For example, in Japanese Patent No. 3288025, the above-described retaining device is introduced, and the content thereof is “in a fixed supply / exhaust pipe in which a receiving port is formed at one end and an insertion port is formed at the other end, A cutout window is cut out, a clearance space and a lock wall are formed inside the cutout window, and a cover part formed toward the distal end side of the slide guide part is attached to the cover part. It is held by the slide guide part and is slidable in the tube axis direction. The lock part formed at the tip part is positioned in the escape space in the cover part, and the operation part is exposed from the cover part to the tip side of the receiving port. A lock member is provided, and when the receiving port of the other pipe is inserted to a predetermined position on the insertion port side, the lock member faces the cut window and the lock member of the lock member falls and comes off. When a force in the pulling direction is applied after connecting the pipe, the locking member slides in the pulling direction together with the pipe and is formed at the tip of the lock portion of the locking member. The engaging part comes into contact with the lock wall in the cover part, and the displacement of the lock part is held down to stop pulling out.On the other hand, once the insertion port side is pushed in a little to retract the lock member together, It is configured so that the pipe can be disconnected by letting the engaging part at the tip escape from the lock wall into the escape space and pulling out the insertion port side while pressing the operation part formed on the lock member with the fingertip in this state. Is an air supply / exhaust pipe retaining device.
Japanese Patent No. 3288025

  However, in the case of the conventional retaining device including the retaining device according to the above-mentioned patented invention, the parts are assembled by using a spot welder in the assembly process of the air supply / exhaust pipe. For this reason, when a product is produced, component retention occurs in the spot welding process, which is an impediment to improving productivity.

  In addition, the positioning of the components is a manual operation by the worker, and many mounting errors occur when the components are joined. In addition, when spot welding is performed on a stainless steel plate, there is a drawback in that the base material is easily corroded due to the heat effect of welding.

  The present invention is provided for the purpose of solving the above-mentioned drawbacks, and by eliminating spot welding from the processing of the retaining device, productivity is improved, and mounting processing errors and heat during joining are improved. Characterized by eliminating the influence.

  As a means for solving the above-mentioned problems, the present invention provides a retaining device for a supply / exhaust pipe according to claim 1, wherein: a. A fixed-size air supply / exhaust pipe having a receiving port at one end and an insertion port at the other end; b. The cover part for the stopper built-in that forms a relief space part in the back with a roof with a slope that opens from the inside of the pipe by drawing processing from the inside of the pipe and is raised toward the rear is integrated into the position slightly above the receiving hole C. A guide groove that has a large inlet portion and is cut to a smaller width than the inlet portion on the top surface of the stopper incorporating cover portion; d. The stopper that is inserted into the stopper cover cover and assembled from the inlet portion is bent at the tip downward to form an inclined claw portion, and the top surface close to the claw portion is raised to form the guide groove. A head portion that is narrower than the inlet portion and formed significantly larger than the guide groove, and an engaging portion that includes a standing portion that is narrower than the guide groove until reaching the head portion, and further, An operation portion is integrally formed at the rear end, and the claw portion is formed of an elastic material warped downward; e. The stopper is inserted into the cover part through the opening from the tip side, and the engaging part formed on the stopper is inserted into the guide groove from the inside to expose the top of the engaging part to the outside of the cover part, The stopper is slidably assembled in the cover part with the upright part positioned in the guide groove, f. Forming a protrusion for stopping the stopper in front of the opening of the cover, g. When the insertion port side of the other tube is inserted into the receiving port, the claw portion of the stopper is applied to the inclined portion formed at the tip of the insertion port of the other tube, and the stopper moves into the cover portion together with the insertion port, and eventually When the claw part is removed from the inclined part, it is slid up by the outer peripheral surface of the insertion port, warps upward, escapes into the escape space formed in the back of the cover part, and further enters the insertion port side, and this insertion port side The stopper is warped by its elastic action when the inner groove formed at the nail part comes back, and the nail part enters into the inner groove to prevent the stopper from coming off. is there.

  According to the present invention, since the cover part is formed by drawing, there is no need to form the cover part alone or attach it to the pipe side by spot welding.

  Further, in the invention according to claim 2, in the air supply / exhaust pipe retaining device according to claim 1, the guide grooves are formed in two rows, and the engaging portions that engage with the guide grooves are formed in two places. It is characterized by that.

  According to the present invention, since the sliding action of the stopper is guided by the two guide grooves and the engaging portion, there is an effect that the slide is stabilized. However, only one engagement portion between the guide groove and the stopper may be provided at the center.

  The effects of the present invention described above are as follows.

  1. Even when the hook of the stopper is large, the insertion resistance is low because the stopper moves together when the insertion port is inserted.

  2. In assembling the parts, the cover part is formed with the base material, and the stopper is assembled to complete the mounting operation. Therefore, it is possible to prevent the base material from being easily corroded by the welding work and welding heat.

  3. When removing the insertion port from the receiving port, the stopper made of spring can be deformed by pushing the operation part of the stopper, and this deformation lifts the claw at the tip into the escape space and the claw from the inner groove Since it escapes, it becomes possible to remove it simply by pulling the insertion port side. In addition, when the finger that presses the operation unit is released, the stopper (claw unit) can be moved to a fixed position by the action of the claw unit and used repeatedly any number of times.

  4). If the insertion port is pulled out in a direction that allows the claw part to come off in a free state, the claw part bites into the inner groove on the insertion port side using the inclination of the cover part. .

  5. Since the stopper is assembled by mounting over the protrusion while deforming the stopper from the opening of the cover, the stopper does not fall off due to the action of the protrusion.

  Embodiments corresponding to claims 1 and 2 will be described in detail with reference to FIGS.

  FIG. 1 is a perspective view for explaining a joint portion of a regular air supply / exhaust pipe and a retaining device provided therein, FIG. 2 is a plan view of the retaining device, and FIG. 3 is a cross-sectional view taken along line AA ′. 4 is a cross-sectional view taken along the line BB ′, FIG. 5 is a plan view of the stopper, FIG. 6 is a front view of the stopper, FIG. 7 is a cross-sectional view taken along the line CC ′, and FIG. 9 is a plan view showing a state in which the stopper is incorporated in the cover portion, FIG. 10 is a cross-sectional view taken along line EE ′, FIG. 11 is a cross-sectional view taken along line FF ′, and FIG.

  The air supply / exhaust pipes shown in the above figures are used while being added to an exhaust passage for exhausting the exhaust exhausted from the exhaust port of the combustion appliance installed indoors to the outdoors. It is formed into a 2 m standard, and a receiving port for the other tube is formed at one end of the standard air supply / exhaust pipe, and an insertion port for insertion into the receiving port of the other tube is formed at the other end. Has been.

  The retaining device is for locking so that it does not come loose when it is inserted and connected to the insertion port of the other pipe, and can be inserted with a single touch, and when it is pulled out, a stopper is attached. It is configured so that it does not come off unless it is consciously operated.

  FIG. 1 shows an image of the air supply / exhaust pipe having such a configuration and the entire retaining device. In FIG. 1, reference numeral 1 denotes a stainless steel cylindrical air supply / exhaust pipe, and 2 denotes a receiving port for receiving an insertion port 3 of another pipe formed at one end. In FIG. 1, an insertion port having the same shape as the insertion port 3 is formed at the end of the air supply / exhaust pipe 1 opposite to the receiving port 2, but is omitted in FIG. 1.

  Reference numeral 4 denotes a retaining device formed outside the insertion port 2, which is separated from the cover portion 5 integrated with the receiving port 2 that is extruded from the inside of the receiving port 2 by pressing (drawing). It consists of a stopper 6 molded as a part.

  The cover part 5 will be described in more detail. The cover part 5 is formed with an opening 7 toward the end side of the receiving port 2 and is raised so that the top surface 8 faces rearward so as to draw a gentle arc. By forming, the opening 7 side is formed low inside, an arc-shaped presser 9 is formed in the middle part inside the top surface 8, and the back side of the top surface 8 is formed high and the escape space portion 10 is formed, and further, a wide enlarged notch 12 is formed in the center of the top surface 8 on the opening 7 side, and a slide guide groove 13 having a width smaller than that of the enlarged notch 12 is formed in the depth direction. An engagement groove 11 is formed.

  In FIG. 1, reference numeral 14 denotes a projecting portion which is processed so that the insertion port 2 is raised from the inside by press working in front of the opening 7, and is formed to prevent a stopper 6 described later from coming off. Has been.

  2 to 4 show details of the cover portion 5, FIG. 2 is a plan view of the cover portion 5, FIG. 3 is a cross-sectional view taken along line AA ′, and FIG. 4 is a cross-sectional view taken along line BB ′. By attaching the reference numerals described in FIG. 1 to the corresponding portions, the shapes of the respective portions described above can be easily understood.

  2 and 4, 15 is an O-ring (seal ring).

  Based on FIGS. 5-8, the stopper 6 demonstrated in FIG. 1 is demonstrated in detail. This stopper 6 is formed by pressing a single elastic stainless steel plate, and the front end side is bent so as to be inclined downward to form a claw portion 16, and the rear end is bent in an inverted U shape. The operation portion 17 is formed and the center at a position close to the claw portion 16 side is cut and raised outward (upward) to form the standing portion 19 and the engagement edges 20 and 20a on the upper left and right sides of the standing portion 19. In this configuration, the joint portion 18 is formed.

  Next, FIG. 9 shows a state in which the stopper 6 is assembled in the cover portion 5 described above, FIG. 10 shows a sectional view taken along line EE ′ of FIG. 9, and FIG. 10 shows a sectional view taken along line FF ′ of FIG. 11 shows.

  9 to 11, the cover portion 5 is inserted into the cover portion 5 while deforming the claw portion 16 side of the stopper 6 from the opening portion 7, and the engaging edges 20, 20a of the engaging portion 18 are guide grooves. The engagement portion 18 is exposed to the outside of the cover portion 5 so as to be slightly lifted when it reaches the 11 enlarged cutout portion 12 and is inserted forward as it is.

  In this way, the upright portion 19 of the engaging portion 18 enters the guide groove 13, and the engaging edges 20, 20 a are outside the both edges of the guide groove 13, so that the stopper 6 is in the back direction within the cover portion 5. It is guided and fits.

  This state is indicated by the position A of the stopper 6 in FIG. At this time, the rear portion of the stopper 6 is in a state of riding on the step portion 14 and remains in the cover portion 5.

  In this state, when the insertion port 3 of the other tube is inserted into the receiving port 2, the tip 3 a of the insertion port 3 of the other tube enters the receiving port 2 while being engaged with the claw portion 16 of the stopper 6. It enters into the part 5 together, reaches the escape space part 10 in the back of the cover part 5, escapes upwards here, the stopper 6 stops, and only the insertion port 3 enters further. The position of the stopper 6 at this time is indicated by B in FIG.

  Further, when the insertion port 3 side enters and eventually the stopper inner groove 3b of the insertion port 3 comes to the position of the claw portion 16 of the stopper 6, the claw portion 16 of the stopper 6 is elastically dropped into the inner groove 3b. The position of the stopper 6 at this time is indicated by C in FIG.

  The state in which the claw portion 16 of the stopper 6 falls into the inner groove 3b is in the locked state, and even if the insertion port 3 moves slightly due to the pulling force applied to the insertion port 3 in the direction of arrow a, D in FIG. As shown in FIG. 2, the engagement wall 3c of the inner groove 3b is caught by the claw portion 16 to prevent the insertion port 3 from moving (withdrawing). At this time, the upper surface of the stopper 6 is in a state of being pressed by a pressing portion 9 formed on the top surface 8 of the cover portion 6 so that it cannot escape upward, and the locked state is reliably maintained.

  Next, when it becomes necessary to pull out the added air supply / exhaust pipe 1 for any reason, when the insertion port 3 is slightly pushed in the width range of the inner groove 3b in the locked state shown by D, the inner groove 3b And the relief space 10 in the cover portion 5 face each other, and a large space is created. When the finger is pushed into the operation portion 17 of the stopper 6 and pushed, the claw portion 16 of the stopper 6 warps upward in the escape space 10. And escape into the escape space 10.

  In this state, the stopper 6 is in the position B in FIG. 12, the lock of the insertion port 3 is released, and it can be easily pulled out.

  Although the stopper 6 can slide smoothly due to the engagement relationship between the engaging portion 18 of the stopper 6 and the guide groove 13, in order to further stabilize the slide, the guide grooves 13 are formed in two rows, You may make it form the engaging part 18 engaged with this in two places.

Industrial application fields

1. 1. Device for preventing supply pipes or exhaust pipes of various combustion appliances from coming off 2. Air supply or ventilation pipe retaining device Detachment device for various gas transport pipes

Explanatory drawing of the retaining device according to the present invention Explanatory drawing of cover part AA 'line sectional view BB 'sectional view Illustration of stopper Front view of the stopper as seen from the operation side CC 'line sectional view DD 'line sectional view Explanatory drawing of the stopper assembled in the cover EE 'line cross section FF 'line cross section Illustration of the action of the stopper

DESCRIPTION OF SYMBOLS 1 Supply / exhaust pipe 2 Receiving port 3 Insertion port 4 Retaining device 5 Cover part 7 Opening part 8 Top surface 9 Pressing part 10 Escape space part 11 Inner groove 12 Enlarged notch part 13 Guide groove 14 Swelling protrusion part 15 O ring 16 Claw part 17 Operation part 18 Engagement part 19 Standing part 20, 20a Engagement edge

Claims (2)

a. In a regular air supply / exhaust pipe with a receiving port at one end and an insertion port at the other end,
b. A cover part for the stopper built-in that forms a clearance space in the back with a roof with a slope that opens from the inside of the pipe by drawing processing from the inside of the pipe and is raised toward the rear at a position slightly beyond the receiving opening Formed in the
c. The top surface of the stopper incorporating cover portion has a large inlet portion, and a guide groove that is cut to a smaller width than the inlet portion toward the rear is formed.
d. The stopper, which is inserted and assembled into the stopper mounting cover part, is formed into the guide groove by bending the tip downward to form an inclined claw part and cutting the top surface close to the claw part. A head portion that is narrower than the inlet portion and formed significantly larger than the guide groove, and an engaging portion is formed that includes an upright portion that is formed narrower than the guide groove until reaching the head portion. The operation part is integrally formed at the rear end, and the claw part side is formed of an elastic material warped downward,
e. The stopper is inserted into the cover part through the opening from the tip side, and the engaging part formed in the stopper is inserted into the guide groove from the inside to expose the top of the engaging part to the outside of the cover part, The stopper is slidably assembled in the cover part with the upright part positioned in the guide groove,
f. Forming a protrusion for stopper stop in front of the opening of the cover part;
g. When the insertion port side of the other tube is inserted into the receiving port, a claw portion of the stopper is applied to the inclined portion formed at the tip of the insertion port of the other tube, and the stopper moves into the cover portion together with the insertion port, and eventually. When the claw part is removed from the inclined part, it is slid up by the outer peripheral surface of the insertion port, warps upward, escapes into the escape space formed in the back of the cover part, and further enters the insertion port side, and this insertion port side When the inner groove formed on the claw part comes to the stopper, the stopper returns to warp due to its elastic action, and the claw part enters the inner groove to prevent it from coming off,
h. An air supply / exhaust pipe retaining device.   2. The air supply / exhaust pipe retaining device according to claim 1, wherein the guide grooves are formed in two rows, and engaging portions of stoppers that engage with the guide grooves are formed in two places. 3.

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