JP2007064245A - Air damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an air damper formed in a rather simple structure and smoothly operable by suppressing the inclination of a piston. <P>SOLUTION: This air damper 10 comprises a cylinder 20, a piston 30 moving in the cylinder 20, a coil spring 71 elastically biasing the piston 30, and a cord-like body 72 hooked to the piston 30. A cord hooking part 50 formed by forming cord hooking holes 54 for passing the cord-like body 72 therethrough in a pair of vertical walls 52, 52 vertically installed through a space 51 from the deviated positions to both sides of the center of the piston 30 is formed integrally with the rear end face of the piston 30. The cord-like body 72 is fixed to the predetermined position of the cylinder 20, its intermediate part is folded back to the end part of the cylinder 20 through the cord hooking part 50 of the piston 30, and its other end is extracted to the outside of the cylinder 20. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an air damper that is used in, for example, a glove box of an automobile and brakes the opening / closing operation thereof.

As a conventional air damper of this type, Patent Document 1 below discloses a cylindrical cylinder, a piston mounted with an O-ring and moving within the cylinder, and connected to the piston and capable of hooking a string-like body. A hook body in which a hook wall is formed and a coil spring that elastically biases the piston toward the base end side, and one end of the string-like body is fixed to the outer periphery of the tip end portion of the cylinder via a clip, An air damper is disclosed in which an intermediate portion thereof is passed through a hook wall of the hook body and folded back to the tip end side of the cylinder, and the other end is inserted into the outside of the cylinder. Further, the hook wall for hooking the string-like body is arranged at the center of the hook body.
JP 2001-108002 A

  However, in the air damper of Patent Document 1, since the piston and the hook body are separately formed, the structure is complicated, the number of parts is increased, the manufacturing cost is increased, and the assembly workability is poor. was there.

  In addition, due to the uneven load caused by the end of the coil spring wire contacting one place in the circumferential direction of the coil seat and the variation in frictional resistance due to insufficient roundness at the contact surface between the piston and the cylinder, On the other hand, the piston tends to tilt, and the piston is caught when it is operated, causing a stepped operation and cannot be moved smoothly.

  Accordingly, an object of the present invention is to provide an air damper that has a relatively simple structure and that can prevent the piston from being inclined with respect to the cylinder and can move the piston smoothly.

In order to achieve the above object, a first aspect of the present invention includes a cylindrical cylinder whose base end is closed and whose distal end is open, a piston that moves inside the cylinder and pressurizes and depressurizes the internal space, and A coil spring that is elastically biased toward the base end side of the cylinder, and a string-like body that is hooked on the piston,
On the rear end face of the piston, a string hooking hole for passing the string-like body is formed on a pair of standing walls provided with a gap from positions displaced on both sides of the center of the piston. Is formed integrally,
One end of the string-like body is fixed to a predetermined portion of the cylinder, an intermediate portion thereof is folded back to the tip end side of the cylinder through a string hooking portion of the piston, and the other end is inserted to the outside of the cylinder. The present invention provides an air damper characterized by being released.

  According to the first aspect of the present invention, the cylinder is fixed to one of the fixed member and the movable member, and the end of the string-like body inserted into the outside of the cylinder is connected to the other, whereby the movable member is When the string-like body is pulled by being moved, the piston slides in the cylinder against the biasing force of the coil spring, and the string-like body is pulled out. When the external force on the movable member is removed, the piston moves to the base end side of the cylinder by the biasing force of the coil spring, and the string-like body is drawn. At this time, since the volume of the space surrounded by the cylinder and the piston changes due to the movement of the piston, a damper action is given by the resistance of outside air to enter and leave the space.

  And in the said 1st invention, since the string hook part which has the string hole which lets the said string-like body pass through was integrally formed in the rear end surface of the piston, the structure becomes simple and the number of parts can be reduced. Since the assembling work with the hook body can be omitted, the assembling workability can be improved and the manufacturing cost can be reduced.

  In addition, the string hanging portion is provided with a pair of standing walls on the rear end face of the piston with a gap from the position displaced on both sides of the center of the piston, and the string-like body is placed on these standing walls. Since the string hooking holes to be passed are formed and configured, the entire width of the string hooking part for hooking the string-like body can be increased. Therefore, it is possible to prevent the piston from being tilted with respect to the cylinder due to a biased load or the like in the circumferential direction of the coil spring that elastically biases the piston. As a result, a stepped operation due to catching when the piston is operated does not occur, and the piston can be moved smoothly.

  Furthermore, by providing a gap between a pair of standing walls having a string hooking hole, the sliding length between the string hooking portion and the string-like body can be shortened, and the sliding resistance can be reduced. The body can move the piston smoothly. Further, since the sliding resistance between the string-like body and the string-hanging portion is small, it is possible to improve the durability of the string-like body itself.

  According to a second aspect of the present invention, in the first aspect of the present invention, the pair of standing walls of the string hanging portion provides an air damper in which both side portions thereof are connected by a connecting portion.

  According to the second aspect of the invention, the string hanging portion has a pair of standing walls, and further, both side portions of the standing wall are connected by the connecting portion, so that the strength and rigidity of the string hanging portion can be increased. it can. Therefore, even when the movable member or the like suddenly operates or an excessive load is applied to the movable member, the string hanging portion may be bent or damaged even if the string hanging portion is pulled strongly by the string-like body. Can be prevented.

  According to a third aspect of the present invention, in the second aspect, the connecting portion is formed to have a size capable of supporting the inner periphery of the coil spring, and a taper is provided at a corner of the upper end portion of the connecting portion. An air damper provided with a portion is provided.

According to the third aspect of the invention, when the coil spring is assembled, the tapered portion provided in the coupling portion serves as a guide and facilitates insertion of the coupling portion into the coil spring. Improve. In addition, after the coil spring is assembled, the coil spring can be supported in a stable posture by the connecting portion that has entered the inner periphery thereof, so that the operability of the piston can be further improved. 4. In any one of the first to third aspects of the invention, the piston is provided with an orifice communicating with the front and rear of the piston at a position overlapping with the gap of the string hook portion in the axial direction. The air damper is provided.

  According to the fourth aspect of the invention, since the piston is provided with the orifice at a position overlapping the gap in the string hook portion in the axial direction, the mold for forming the gap in the piston molding die For example, if a hole is provided in the part, the tip of a thin pin for forming an orifice can be inserted into a hole of a mold that forms a gap, and as a result, the pin for forming an orifice can be supported at both ends. It becomes possible. Therefore, the pin can be prevented from being bent or tilted by the injection pressure, the pin can be prevented from swinging, the dimensional accuracy of the inner diameter of the orifice can be improved, and the air flow resistance of the orifice can be made constant. It becomes.

  According to the air damper of the present invention, since the string hooking portion is formed integrally with the piston, the structure is simple, the number of parts can be reduced, the assembly workability can be improved, and the manufacturing cost can be reduced. Moreover, since the stringing part is formed by forming a stringing hole in a pair of standing walls arranged via a gap, the entire width of the stringing part can be increased, and due to the biased load of the coil spring, etc. The piston can be moved smoothly by suppressing the inclination of the piston, and the sliding length with the string-like body is shortened, so that the sliding resistance can be reduced and the operability of the piston can be improved.

  Hereinafter, with reference to FIGS. 1-6, one Embodiment of the air damper of this invention is described.

  As shown in FIG. 1, the air damper 10 has a base 20 that is closed and has a bottomed shape, and a cylinder 20 that has a substantially cylindrical shape with an open front end, and is inserted into the cylinder 20. A piston 30, a cap 60 attached to the distal end portion of the cylinder 20, and a coil spring 71 interposed between the piston 30 and the cap 60 to elastically bias the piston 30 toward the proximal end portion of the cylinder 20. Have.

  The cylinder 20 is provided with an annular protrusion 21 on the outer periphery of its tip, and adjacent to the annular protrusion 21 are locking holes 22 and 22 for locking an elastic locking piece 66 of a cap 60 described later. Are provided opposite to each other in the circumferential direction. Further, in the inner periphery of the cylinder 20 shifted by 90 degrees with respect to the locking hole 22, concave grooves 23 and 23 are provided to face each other, and a rib 67 of a cap 60 described later is inserted so that the cap 60 is connected to the cylinder. A guide for assembling to 20 and a rotation stopper are provided.

  A plurality of attachment pieces 24 are formed on the outer periphery of the distal end portion and the proximal end portion of the cylinder 20. The attachment piece 24 is provided with attachment holes 25 for attachment to an instrument panel or the like of the vehicle.

  The piston 30 includes a base portion 40 to which the O-ring 70 is attached, and a string hook portion 50 that protrudes from the base portion 40 and is hooked with a string-like body 72.

  Referring also to FIG. 2, the base 40 includes a substrate 41, a cylindrical portion 42 connected to the substrate 41, and a reduced diameter portion 48 in which a diameter of a portion facing the circumferential direction of the cylindrical portion 42 is reduced. , And a flange portion 43 formed on the rear end surface of the base portion 40.

  The substrate 41 has a shape in which four circumferential positions of a disc that fits the inner periphery of the cylinder 20 are cut into a straight line. A portion of the substrate 41 cut in a straight line forms a gap with the inner periphery of the cylinder 20 and serves as an air flow path to be described later.

  An O-ring 70 is attached to the outer periphery of the cylindrical portion 42 and the reduced diameter portion 48. In other words, the O-ring 70 is disposed between the substrate 41 and the flange portion 43, and when it moves closer to the substrate 41, it is disposed on the outer periphery of the cylindrical portion 42 to seal the gap between the cylindrical portion 42 and the cylinder 20. (See FIG. 6). Further, when the O-ring 70 moves closer to the flange portion 43, the O-ring 70 is disposed on the outer periphery of the reduced diameter portion 48 to form a gap with the piston 30 so that the space before and after the piston 30 is communicated (see FIG. 5). .

  As described above, the flange portion 43 serves as one stopper wall that restricts the movement of the O-ring 70 in the axial direction, and serves as a receiving seat that receives one end of the coil spring 71. The flange portion 43 is notched in a trapezoidal shape at two locations facing each other in the circumferential direction, and air flows through the notched portion 44. The notch 44 is provided corresponding to the reduced diameter portion of the reduced diameter portion 48 described above.

  On the end surface of the substrate 41 that forms the tip surface of the piston 30, protrusions 41a are formed at a plurality of locations in the circumferential direction. When the piston 30 comes into contact with the inner bottom surface of the cylinder 20, the projection 41 a forms a predetermined gap with the inner bottom surface, and the piston 30 is in close contact with the inner bottom surface and cannot be separated smoothly. This is to prevent this.

  Inside the base 40, a space 42a is formed that opens to the end surface of the substrate 41. The space 42a keeps the wall thickness of the piston 30 constant and prevents sink marks during molding. A rear end surface 45 of the base 40 is disposed in the inner space 42a. The outer periphery of the rear end surface 45 forms the flange portion 43, and an orifice 47 is formed at the center thereof. The front and rear spaces of the piston 30 are communicated with each other through the orifice 47 and the space 42a.

  Therefore, as shown in FIG. 5, when the O-ring 70 moves toward the flange portion 43 and is disposed on the outer periphery of the reduced diameter portion 48, a large gap is formed between the piston 30 and the cylinder 20. The outside air enters and leaves the space surrounded by the piston 30 and the cylinder 20 relatively freely, and the damper action is weakened.

  As shown in FIG. 6, when the O-ring 70 moves toward the substrate 41 and is disposed on the outer periphery of the cylindrical portion 42, the gap between the cylindrical portion 42 and the cylinder 20 is sealed with the O-ring 70. Therefore, the flow path communicating with the space surrounded by the piston 30 and the cylinder 20 is only the passage by the orifice 47 and the space 42a. For this reason, since the outside air enters and exits the space surrounded by the piston 30 and the cylinder 20 only through the orifice 47, a strong damper action is added.

  A string hook portion 50 is integrally formed on the rear end surface 45 of the base portion 40. The string hanging portion 50 includes a pair of upright walls 52 and 52 erected substantially in parallel from a position deviated on both sides across the center of the rear end surface 45 (portion where the orifice 47 is provided), and these upright walls 52. , 52, and connecting portions 53, 53 that connect both side portions, and a string hooking hole 54 formed in these standing walls 52, 52. The string hook hole 54 has a U-shaped inner periphery, and as a result, the string hook portion 50 has an arch shape as a whole.

  The string-like body 72 is passed through the string-engaging holes 54 of the standing walls 52, 52 of the string-hanging portion 50. Since the standing walls 52, 52 are erected via the gap 51, the string-hanging portion 50 is compared. The string-like body 72 is supported with a wide width. Further, the contact area between the string-like body 72 and the string hooking portion 50 is only a portion that contacts the inner periphery of the string hooking hole 54 of the standing walls 52 and 52.

  And the orifice 47 of the rear-end surface 45 of the base 40 is provided in the position which overlaps the space | gap formed between the standing walls 52 and 52 of the stringing part 50, when it sees from an axial direction.

  Moreover, the edge part of the connection parts 53 and 53 which connect the both sides of the standing walls 52 and 52 is chamfered in the taper shape. Further, the outer periphery of the connecting portions 53, 53 has an arcuate curved surface when viewed from the axial direction, and the outer diameter thereof is adapted to the inner periphery of the coil spring 71.

  Next, the cap 60 attached to the tip end side of the cylinder 20 will be described. As shown in FIG. 1, the cap 60 includes an outer diameter cylindrical portion 61 that fits the inner periphery of the cylinder 20, a trumpet-shaped wall portion 62 that forms one end surface of the cylindrical portion 61, and the wall The insertion hole 63 of the string-like body 72 formed at the center of the part 62 and the flange part 64 formed on the outer periphery of the wall part 62 are provided. An elastic locking piece 66 that engages with the locking hole 22 of the cylinder 20 is formed through a U-shaped slit 65 at a position facing the circumferential direction of the outer periphery of the cylindrical portion 61. Further, on the outer periphery shifted by 90 degrees from the elastic locking piece 66, a rib 67 along the axial direction is formed to face the outer periphery. Further, on the other end face of the cylindrical portion 61, there is a hook 68 that extends in the axial direction from the outer periphery of the insertion hole 63 and is bent to the outer diameter side to form a substantially J shape. Is formed. The hook 68 is a portion for hooking a hook hooking portion 74 of a string-like body 72 described later.

  Further, as shown in FIG. 1, the string-like body 72 hooked on the piston 30 and the cap 60 described above is provided with a movable member hooking portion 73 having an annular shape at one end, and similarly having an annular shape at the other end. A hook hooking portion 74 is provided, and is hooked on a movable member (not shown) and a hook 68 of the cap 60.

  Each member described above can be formed by injection molding a synthetic resin such as polyoxymethylene (POM).

  Next, among the above members, a mold for injection molding the piston 30 will be described with reference to FIGS.

  As shown in FIG. 3, the mold 100 includes a main body frame 110 that forms the outer periphery of the piston 30, a lower frame 140 that is set below the main body frame 110 and forms a lower surface that includes an orifice 47, and the main body. It is mainly composed of an upper frame 150 that is set above the frame 110 and forms the gap 51 of the strap portion 50.

  The main body frame 110 includes a right frame 120 and a left frame 130, and has a structure that is divided into two in the horizontal direction. The right frame 120 is provided with a cavity 121 that forms the right half of the outer shape of the piston 30. Similarly, the left frame 130 is provided with a cavity 131 that forms the left half of the outer shape of the piston 30. . Each of the cavities 121 and 131 has a shape in which the upper and lower sides are opened, and the upper frame 150 and the lower frame 140 can be inserted from above and below when the main body frame 110 is closed. Protrusions 122 and 132 for forming the string hooking holes 54 of the string hooking portions 50 are provided above the central portions of the cavities 121 and 131. Referring to FIG. 4 together, the protrusions 122 and 132 have the same height as that of the standing wall 52 constituting the strap portion 50 and come into contact with both side surfaces of the upper frame 150. .

  Further, below the protrusions 122 and 132 of the cavities 121 and 131, protrusions 123 and 133 for forming the notched portion 44 and the reduced diameter portion 48 of the flange portion 43 are connected (see FIG. 4). .

  At least one of the right frame 120 and the left frame 130 described above is slidable in the horizontal direction by an air cylinder (not shown) or the like, so that the main body frame 110 can be opened and closed. Although not shown for convenience, the right frame 120 and / or the left frame 130 are provided with gates communicating with the cavities 121 and 131, and an injection nozzle of a resin molding machine (not shown) is inserted into the gate. Thus, a resin material is injected.

  The lower frame 140 for forming the lower surface of the piston 30 is inserted into the openings on the lower side of the closed cavities 121 and 131 when the main body frame 110 is closed. As shown in FIG. 3, the lower frame 140 has a columnar base 141 that matches the inner peripheral shape of each of the cavities 121 and 131 of the right frame 120 and the left frame 130. On the base 141, a cylindrical part 142 having a slightly reduced diameter concentrically and a column part 143 extending from the cylindrical part 142 in a flat plate shape are formed, and the cylindrical part 142 and the column part 143 are formed. Is a portion forming the space 42 a in the piston 30. Further, a pin 144 for forming the orifice 47 is erected at the center of the upper end of the column portion 143. The lower frame 140 is slidable in the vertical direction with respect to the main body frame 110 by an air cylinder (not shown) or the like.

  On the other hand, the upper frame 150 for forming the gap 51 of the string hooking portion 50 of the piston 30 is inserted into the opening on the upper side of the closed cavities 121 and 131 when the main body frame 110 is closed. Yes. The gap 51 of the string hooking portion 50 of the piston 30 is configured to overlap the orifice 47 formed in the base portion 40 in the axial direction. Therefore, it is possible to form a portion that supports the tip at a position corresponding to the position of the orifice forming pin 144. In this case, a small diameter receiving hole 151 as shown in FIG. 4 is formed at the center of the lower end of the upper frame 150. Similarly to the lower frame 140 described above, the upper frame 150 can be slid in the vertical direction with respect to the main body frame 110 by an air cylinder (not shown).

  Each of the above frames is formed by inserting the lower frame 140 from below the openings of the cavities 121 and 131 and inserting the upper frame 150 from above the openings of the cavities 121 and 131 after the main body frame 110 is closed. Set as shown in At this time, both sides of the upper frame 150 come into close contact with the protrusions 122 and 132, respectively. Further, the pin 144 for forming the orifice 47 of the lower frame 140 is inserted into the receiving hole 151 of the upper frame 150.

  In this state, a synthetic resin is injected into each of the cavities 121 and 131 from an injection nozzle of an injection molding machine (not shown) through a gate. At this time, since the pins 144 for forming the orifice 47 are inserted into the receiving holes 151 of the upper frame 150 and both ends thereof are supported, the pins 144 are broken by the injection pressure of the synthetic resin, Inclination can be surely prevented. Further, since the pin 144 can be prevented from swinging, the dimensional accuracy of the inner diameter of the orifice 47 can be improved, and the air flow resistance of the orifice 47 can be made constant.

  Next, the effect of the air damper 10 of the present invention will be described.

  The air damper 10 is assembled as follows, for example. The assembly order is not limited to the following order.

  First, the hook hooking portion 74 of the string-like body 72 is hooked on the hook 68 of the cap 60 and pulled out from the one end side of the coil spring 71 through the string-like body 72 from the other end side. In this state, the movable member hooking portion 73 of the string-like body 72 is pulled through the string hooking hole 54 of the piston 30 so as to be folded back toward the cap 60, and then the inner circumference of the coil spring 71 is compressed while being compressed. Then, the string-like body 72 is passed through, and the movable member hooking portion 73 which is the end portion thereof is pulled out from the insertion hole 63 of the cap 60. Thus, after inserting the coil spring 71 in a compressed state between the cap 60 and the piston 30 and inserting them into the cylinder 20, the cylindrical portion 61 of the cap 60 is inserted into the tip of the cylinder 20, The air damper 10 is assembled as shown in FIGS. 5 and 6 by engaging the elastic locking pieces 66 of the cap 60 with the locking holes 22 and 22 of the cylinder 20 and mounting the cap 60 to the cylinder 20. A clip (not shown) is attached to the movable member hooking portion 73 in advance, the string-like body 72 is inserted from the insertion hole 63 of the cap 60, folded back by the string hooking portion 50, and finally hooked on the hook 68. Good.

  The air damper 10 of the present invention thus obtained has a simple structure because the string hooking portion 50 to which the string-like body 72 is hooked is formed integrally with the base portion 40 to which the O-ring 70 is attached to form the piston 30. Thus, the number of parts can be reduced, the assembling man-hours can be reduced, the assembling workability can be improved, and the manufacturing cost can be reduced.

  The air damper 10 is applied to, for example, opening and closing a glove box of an automobile. In this case, the air damper 10 is fixed to the instrument panel of the automobile via the attachment piece 24, and the movable member hooking portion 73 of the string-like body 72 inserted from the cap 60 is used as a hook or the like formed in the glove box. Hook.

  FIG. 5 shows the air damper 10 in a state where the glove box is closed. At this time, the piston 30 is pushed to the maximum extent by the elastic biasing force of the coil spring 71 on the proximal end side of the inner periphery of the cylinder 20. In this state, the O-ring 70 is in contact with the flange portion 43 of the piston 30.

  When opening the glove box, as shown in FIG. 6, the string-like body 72 slides on the inner periphery of the string-engaging hole 59 of the string-engaging portion 50 of the piston 30 in accordance with the opening operation of the glove-box. The piston 30 is pulled out to pull the piston, so that the piston 30 moves toward the tip of the cylinder 20 against the elastic biasing force of the coil spring 71.

  At this time, as the piston 30 moves toward the distal end side, the O-ring 70 moves toward the proximal end side and comes into contact with the substrate 41 of the piston 30 and is disposed on the outer periphery of the cylindrical portion 42. The gap between 30 and the inner periphery of the cylinder 20 is sealed. As a result, the internal space B formed by the piston 30 and the cylinder 20 shown in FIG. 6 communicates with the external space only through the orifice 47 formed in the piston 30. For this reason, a large resistance is generated for the external air to flow into the internal space B, the internal space B is depressurized, a strong braking force is applied to the movement of the piston 30, and the glove box can be opened slowly. .

  When closing the glove box, the piston 30 is moved toward the base end side of the cylinder 20 by the elastic biasing force of the coil spring 71 by lightly pushing in the closing direction of the glove box. At this time, the O-ring 70 moves closer to the flange portion 43 and is disposed on the outer periphery of the reduced diameter portion 48, and a large gap is formed between the piston 30 and the cylinder 20. External air enters and exits the enclosed space relatively freely, and the damper action is weakened. For this reason, the piston 30 moves smoothly while a light braking force is applied, and the glove box can be easily closed.

  In this air damper 10, the string-like body 72 is folded back at the base end portion of the cylinder 10, so that the string-like body 72 is pulled out with a length almost twice as long as the length of the cylinder 10. Is possible.

  In the air damper 10 of the present invention, the string hooking hole 54 is formed in the standing walls 52 and 52 that are erected via the gap 51 at positions shifted to both sides with respect to the center of the piston 30, and the string hooking section 50. Thus, the overall width of the strap portion 50 can be increased.

  Therefore, the piston 30 can be stably pulled by the string-like body 72, applied to the O-ring 70, dimensional accuracy such as the circumferential load of the coil spring 71, the roundness of the cylinder 20 and the piston 30, and the like. Even when the sliding resistance between the piston 30 and the cylinder 20 is biased due to uneven application of grease or the like, the piston 30 can be prevented from tilting with respect to the cylinder 20.

  As described above, the piston can be smoothly moved by preventing the piston from being tilted with respect to the cylinder, and the piston 30 is caught when it moves a little and stops when it moves a little. Such a stepped operation can be effectively prevented.

  Further, since the gap 51 is provided between the standing walls 52, 52 of the string hook portion 50, the sliding length with the string-like body 72 can be shortened to reduce the sliding resistance, and the operation of the piston 30 As it becomes lighter, it improves slipperiness and improves operability. Further, since the sliding resistance between the string-like body 72 and the string-hanging portion 50 is small, the durability of the string-like body 72 itself can be improved.

  Further, in the air damper 10 of the present invention, the string hooking portion 50 is composed of a pair of standing walls 52, 52 and connecting portions 53 that connect both side portions of the standing walls 52, 52. Strength and rigidity can be increased. Therefore, even when the glove box or the like suddenly operates, even if the string hooking portion 50 is strongly pulled by the string-like body 72, the string hooking portion 50 is effectively prevented from being damaged or broken. be able to.

  Further, in the air damper 10 of the present invention, the tapered portion 55 is provided at the connecting portion 53 and the upper end thereof. Therefore, when the coil spring 71 is assembled, the tapered portion 55 serves as a guide, and the inner periphery of the coil spring 71 is provided. The stringing part 50 can be easily inserted, and the assembly workability of the coil spring 71 is improved.

  In addition, after the coil spring 71 is assembled, the connecting portion 53 inserted in the inner periphery of the coil spring 71 supports the coil spring 71 in a stable posture. It is possible to prevent the piston 30 from being imparted to the piston 30 and to further improve the operability of the piston 30.

It is a disassembled perspective view which shows one Embodiment of the air damper of this invention. The piston of the air damper is shown, (a) is a front view, (b) is a right side view, (c) is a cross-sectional view taken along the line AA of (a), and (d) is a left side view. . It is a disassembled perspective view which shows the shaping | molding die for forming the piston of the air damper. It is sectional drawing when the shaping | molding die for forming the piston of the air damper is closed. It is explanatory drawing which shows the state which the piston of the air damper was located in the base end part side of the cylinder. It is explanatory drawing which shows the state which the piston of the air damper moved to the front-end | tip part side of a cylinder.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Air damper 20 Cylinder 30 Piston 40 Base 41 Board | substrate 42 Cylindrical part 43 Flange part 47 Orifice 50 Stringing part 51 Cavity 52 Standing wall 53 Connection part 55 Taper part 60 Cap 68 Hook 70 O-ring 71 Coil spring 72 String-like body

Claims (4)

A cylindrical cylinder whose base end is closed and whose front end is open, a piston that moves inside the cylinder to pressurize and depressurize the internal space, and a coil spring that elastically biases the piston toward the base end of the cylinder And a string-like body hooked on the piston,
On the rear end face of the piston, a string hooking hole for passing the string-like body is formed on a pair of standing walls provided with a gap from positions displaced on both sides of the center of the piston. Is formed integrally,
One end of the string-like body is fixed to a predetermined portion of the cylinder, an intermediate portion thereof is folded back to the tip end side of the cylinder through a string hooking portion of the piston, and the other end is inserted to the outside of the cylinder. An air damper characterized by being released.   2. The air damper according to claim 1, wherein the pair of standing walls of the string hanging portion are connected to each other at both side portions by a connecting portion.   The air damper according to claim 2, wherein the connecting portion is formed to have a size capable of supporting the inner periphery of the coil spring, and a tapered portion is provided at a corner of the upper end portion of the connecting portion.   The air damper according to any one of claims 1 to 3, wherein the piston is provided with an orifice communicating with the front and rear of the piston at a position overlapping the gap of the string hook portion in the axial direction.

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