JP2017096375A - Buffer and support rod using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a buffer capable of easily changing a relative position of an outer cylinder and internal member.SOLUTION: A buffer 9A includes a communication passage 9d communicating between an internal space 4a of a support rod pipe 4 and the outside, a valve body 9e covering an opening part 9d1 of the communication passage 9d, and a communication hole 9e1 having a smaller diameter than the communication passage 9d. In insertion operation of an upper stage pipe 5 to the support rod pipe 4, the valve body 9e closes the opening part 9d1, and then air in the internal space 4a flows to the communication passage 9d through the communication hole 9e1. In pull-out operation, the valve body 9e opens the opening part 9d1, and then air in the communication passage 9d directly flows to the internal space 4a.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a shock absorber provided on an inner member that can be inserted into and removed from an outer cylinder, and capable of sliding in close contact with the inner peripheral surface of the outer cylinder when the inner member is inserted into the outer cylinder, and a column using the same.

  Conventionally, as an irrigator stand for hanging an infusion bottle, an outer cylinder, an inner member that can be inserted into and removed from the outer cylinder, and a fixing means such as a screw for fixing the relative position of the outer cylinder and the inner member, One that can adjust the support height is known.

  In this type of Illrigator stand, when the fixing by the fixing means is not enough, or when the user accidentally releases the hand while adjusting the support height by releasing the fixing, Of the outer cylinder and the inner member, there is a possibility that the member positioned above falls suddenly.

  As a device for preventing such a sudden drop, a shock absorber provided at the end of the insertion portion of the inner member is known (for example, see Patent Document 1). In the shock absorber, the internal space of the outer cylinder is almost sealed, thereby increasing the atmospheric pressure of the inner cylinder, and by the air resistance, the falling speed of the member positioned above the outer cylinder and the inner member (that is, , The moving speed in the direction of narrowing the internal space) is reduced.

JP 2013-103013 A

  However, since the shock absorber described in Patent Document 1 has high airtightness, the atmospheric pressure in the inner space of the outer cylinder is unlikely to change. Therefore, when changing the relative position of an outer cylinder and an inner member, there existed a problem that big force was needed by air resistance.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a shock absorber that can easily change the relative position between an outer cylinder and an inner member, and a support using the shock absorber.

  In order to achieve the above object, a shock absorber according to the present invention is provided on an inner member that can be inserted into and removed from an outer cylinder, and in close contact with the inner peripheral surface of the outer cylinder when the inner member is inserted into the outer cylinder. A movable shock absorber, a communication path that communicates the internal space of the outer cylinder with the outside, a communication hole having a smaller diameter than the communication path, and the insertion operation of the inner member into the outer cylinder, And a flow rate adjusting means for closing the opening of the communication passage and allowing fluid to flow through the communication hole and opening the opening when the inner member is pulled out from the outer cylinder. And

  Thus, in the shock absorber according to the present invention, the opening is opened by the flow rate adjusting means when the inner member is pulled out from the outer cylinder. As a result, the fluid easily flows into the internal space, so that the inner member can be easily pulled out from the outer cylinder with a small force.

  On the other hand, when the inner member is inserted into the outer cylinder, the communication path is closed by the flow rate adjusting means, but is not completely closed, and the outside and the inner space of the outer cylinder are communicated with each other through the communication hole. It becomes a state. Therefore, the fluid inside the internal space of the outer cylinder is discharged to the outside through a communication hole having a smaller diameter than the communication path. As a result, the resistance during the insertion operation of the inner member into the outer cylinder is larger than the resistance during the pulling-out operation, but smaller than the resistance in the conventional shock absorber that does not discharge the fluid.

  Therefore, according to the shock absorber of the present invention, the relative position between the outer cylinder and the inner member can be easily changed.

  Further, in the shock absorber according to the present invention, the flow rate adjusting means is located at a position covering the opening when the outer cylinder and the inner member are fixed and when the inner member is inserted into the outer cylinder. The opening is closed, and when the inner member is pulled out from the outer cylinder, the opening is pushed away from the opening by the force received from the fluid flowing into the internal space from the outside through the communication path. The opening may be opened.

  Further, in the shock absorber according to the present invention, the flow rate adjusting means is at a position away from the opening when the outer cylinder and the inner member are fixed and when the inner member is pulled out from the outer cylinder. Then, the opening is opened, and the opening is covered by a force received from a fluid that flows out from the internal space to the outside through the communication path when the inner member is inserted into the outer cylinder. The opening may be closed by being pushed in the direction.

  In the shock absorber according to the present invention, the flow rate adjusting means is a flexible valve body that covers the opening, and the valve body flows into the internal space from the outside via the communication path. You may comprise so that it may bend by the force received from a fluid.

  The flow rate adjusting means includes a valve body that covers the opening, and a biasing member that biases the valve body to press the opening, and the valve body is configured to pass through the communication path. You may comprise so that it may move by the force received from the fluid which flows in into the said internal space from the said outside.

  In the shock absorber according to the present invention, it is preferable that the communication hole is formed in the valve body.

  Since the valve body is a plate material, the process of forming the communication hole can be easily performed, and the diameter of the communication hole can be accurately set to an arbitrary size. That is, when the communication hole is provided in the valve body, a member that can obtain a desired air discharge amount can be easily manufactured. For this reason, for example, when the inner member and the outer cylinder are arranged vertically, the member positioned above the outer cylinder and the inner member can be configured to gently fall at an arbitrary speed.

  Moreover, in order to achieve the said objective, the support | pillar of this invention may be comprised with said buffering device, an outer cylinder, and an inner member.

The perspective view which shows the external appearance of the Illrigator stand provided with the buffering device which concerns on 1st Embodiment of this invention. FIG. 3 is a perspective view of a shock absorber provided in the Illrigator stand of FIG. FIG. 3A is a cross-sectional view of the shock absorber of FIG. 2 along line AA, FIG. 3A shows a state at the time of insertion, and FIG. The perspective view of the buffering device which concerns on 2nd Embodiment of this invention. 5A and 5B are cross-sectional views of the shock absorber shown in FIG. 4, in which FIG. 5A shows a state during insertion, and FIG. 5B shows a state during extraction. The perspective view of the buffering device which concerns on 3rd Embodiment of this invention. It is CC sectional view taken on the line of the shock absorber of FIG. 6, FIG. 7A shows the state at the time of insertion, and FIG. 7B shows the state at the time of extraction. The perspective view of the buffering device which concerns on 4th Embodiment of this invention. 9A and 9B are cross-sectional views of the shock absorber shown in FIG. 8, in which FIG. 9A shows a state when inserted, and FIG. 9B shows a state when pulled out. The perspective view of the shock absorber which concerns on the modification of 4th Embodiment of this invention. The perspective view of the shock absorber which concerns on the other modification of 4th Embodiment of this invention. The perspective view of the buffering device concerning a 5th embodiment of the present invention. The top view which shows the damper parts of the shock absorber of FIG. FIG. 14A is a cross-sectional view of the shock absorber of FIG. 12 taken along the line E-E, FIG. 14A shows a state when inserted, and FIG. 14B shows a state when pulled out. FIG. 15A is a schematic diagram of a shock absorber according to a sixth embodiment of the present invention, FIG. 15A is a front view, and FIG. 15B is a rear view. The perspective view which shows the shape of the damper parts of the shock absorber of FIG. It is sectional drawing of the direction in alignment with the axis line of the buffering device of FIG. 15, FIG. 17A shows the state at the time of insertion, and FIG. 17B shows the state at the time of extraction. FIG. 18A is a cross-sectional view of the shock absorber shown in FIG. 17 taken along the line FF, FIG. 18A shows a state at the time of insertion, and FIG.

[First Embodiment]
Hereinafter, with reference to FIGS. 1 to 3, the Irrrigger stand provided with the shock absorber according to the first embodiment will be described. In FIG. 3, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow.

  First, with reference to FIGS. 1-3, the structure of the Illrigator stand S is demonstrated.

  As shown in FIG. 1, the irrigator stand S (post) includes a base 1, six legs 2 extending radially from the base 1, casters 3 attached below the tip of each leg 2, and a base 1 is a cylindrical support pipe 4 (outer cylinder) erected on 1, a cylindrical upper pipe 5 (inner member) inserted into the support pipe 4, and a side of the upper pipe 5 opposite to the support pipe 4 side. A hanging tool 6 for hanging an infusion bottle, etc., a fixed handle 7 provided at an end of the upper pipe 5 side of the support pipe 4, and a middle of the support pipe 4, And a handle 8 that is gripped by the user when the S is moved.

  The cylindrical support pipe 4 has a wall surface of the support pipe 4, a base 1 that closes the lower end of the support pipe 4, and an insertion-side end of the upper pipe 5 (that will be described later). The internal space 4a hermetically sealed with the shock absorber 9A) is formed (see FIG. 3).

  The cylindrical upper pipe 5 can be freely inserted into and removed from the cylindrical support pipe 4, and their relative positions can be arbitrarily changed in a state where they are not fixed by the fixed handle 7. Further, an upper pipe-side fixing hole 5a that penetrates the wall surface is formed at the tip of the upper pipe 5 (see FIG. 3).

  The fixed handle 7 includes a grip portion for a user to hold and a male screw portion fixed to the grip portion. The male screw portion is screwed into a fixing hole (not shown) formed so as to penetrate the wall surface of the support pipe 4.

  When the fixed handle 7 is turned to one side, the tip of the male screw portion is pressed against the outer peripheral surface of the upper pipe 5 inserted into the pillar pipe 4, and the relative position between the pillar pipe 4 and the upper pipe 5 is fixed. . When the fixed handle 7 is turned to the other side, the fixing is released and the relative position between the support pipe 4 and the upper pipe 5 can be changed.

  As shown in FIG. 2, a shock absorber 9 </ b> A is provided at the end of the upper pipe 5 on the insertion side to the support pipe 4.

  As shown in FIG. 3, the shock absorber 9 </ b> A includes an insertion portion 9 a inserted into the upper pipe 5 and a sealing portion positioned outside the upper pipe 5 when attached to the end of the cylindrical upper pipe 5. 9b.

  The insertion portion 9 a is formed with a smaller diameter than the upper pipe 5. The insertion portion 9a is formed with a shock absorber side fixing hole 9a1 formed so as to be oriented across the axis of the upper pipe 5 when the upper pipe 5 is mounted. The shock absorber 9A and the upper pipe 5 are fixed by screwing a fixing screw 10 into the shock absorber side fixing hole 9a1 so as to penetrate the upper pipe side fixing hole 5a of the upper pipe 5.

  The sealing portion 9 b is formed to have a larger diameter than the upper stage pipe 5 and a smaller diameter than the support pipe 4. An annular recess 9b1 is formed on the outer peripheral surface of the sealing portion 9b. A rubber O-ring 9c is fitted into the annular recess 9b1 as a sealing member. The O-ring 9 c is slidable in close contact with the inner peripheral surface of the support pipe 4 when the upper pipe 5 is inserted into the support pipe 4. The O-ring 9c prevents air flow between the internal space 4a of the support pipe 4 existing below the shock absorber 9A and the outside of the Irrrigger stand S.

  Further, when the insertion portion 9 a is inserted into the upper pipe 5 and then fixed, the upper end of the sealing portion 9 b and the lower end of the upper pipe 5 come into contact with each other. At this time, a part of the upper end of the sealing portion 9b is recessed so as to communicate with a communication passage 9d described later. Therefore, a gap communicating with the communication path 9d is formed between a part of the upper end of the sealing portion 9b and the lower end of the upper pipe 5.

  The shock absorber 9A is formed with a communication passage 9d that penetrates the sealing portion 9b. In a state where the upper pipe 5 is inserted into the support pipe 4, the internal space 4a of the support pipe 4 existing below the shock absorber 9A and the outside of the irrigator stand S are connected to the upper end of the communication path 9d and the sealing portion 9b. The air (fluid) is communicated through the gap between the section and the lower end of the upper pipe 5 and between the support pipe 4 and the upper pipe 5 so as to be able to flow therethrough.

  Note that the communication path is not limited to such a path, and any communication path may be used as long as the internal space 4a communicates with the outside of the Illrigator stand S through the communication path 9d.

  In the shock absorber 9A, the opening 9d1 on the inner space 4a side of the communication path 9d is formed at the lower end of the sealing portion 9b.

  The opening 9d1 is covered with a flexible plate-like valve body 9e (flow rate adjusting means). The valve body 9e is attached to the lower end part of the sealing part 9b with one attachment screw 9f. That is, the valve body 9e has a cantilever shape that covers the opening 9d1 at the free end on one side in the longitudinal direction and is fixed to the sealing portion 9b by the mounting screw 9f on the other side. Therefore, the opening 9d1 is closed by the valve body 9e when the support pipe 4 and the upper pipe 5 are fixed, and is opened when the valve body 9e is bent.

  The valve body 9e is formed with a communication hole 9e1 that allows the internal space 4a to communicate with the communication path 9d in a state where the valve body 9e covers the opening 9d1. The diameter of the communication hole 9e1 is smaller than that of the communication path 9d.

  Next, referring to FIG. 3, the function of the shock absorber 9 </ b> A when changing the relative position between the support pipe 4 and the upper pipe 5 in the Illrigator stand S will be described.

  As shown in FIG. 3A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the atmospheric pressure in the internal space 4a is increased. At this time, the opening 9d1 of the communication passage 9d is covered with the valve body 9e. However, the outside of the Irrrigger stand S and the internal space 4a are not completely shut off, but are in a state of being communicated through the communication hole 9e1 provided in the valve body 9e.

  Therefore, the air inside the internal space 4a is discharged to the outside through the communication hole 9e1 having a smaller diameter than the communication path 9d. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 3B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the atmospheric pressure in the internal space 4a is lowered. At this time, the valve body 9e is pushed and bent by the air flowing into the internal space 4a from the outside of the Irrrigger stand S via the communication passage 9d, and the opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Since the Irrrigger stand S provided with the shock absorber 9A of the present embodiment described above is provided with the shock absorber 9A, when the fixing by the fixed handle 7 is not sufficient or when the fixing is released, the support height is adjusted. Even when the user accidentally releases his / her hand while performing the operation, the upper pipe 5 does not drop suddenly with respect to the support pipe 4.

  On the other hand, when adjusting the support height, the shock absorber 9A adjusts the flow rate of air passing through the communication path between the outside of the Irrrigger stand S and the internal space 4a of the support pipe 4. Therefore, the pulling-out operation from the upper pipe 5 of the support pipe 4 can be easily performed with a small force. Further, the insertion operation of the support pipe 4 into the upper pipe 5 can be performed with a smaller force than that of the conventional irrigator stand provided with a shock absorber that does not discharge air.

  Furthermore, since the valve body 9e is a plate material, the shock absorber 9A can easily perform the process of forming the communication hole 9e1, and the diameter of the communication hole 9e1 can be accurately set to an arbitrary size. That is, the shock absorber 9A can be easily manufactured.

  In the Illrigator stand S, when the fixing by the fixed handle 7 is released, the upper pipe 5 gently falls at a speed corresponding to the diameter of the communication hole 9e1. This drop speed changes according to the weight of the drip bottle or the like suspended from the hanger 6 and the diameter of the communication hole 9e1 formed in the valve body 9e. That is, the falling speed changes according to the air discharge amount when the communication passage 9d is closed by the valve body 9e.

  Since the shock absorber 9A included in the Illrigator stand S is fixed to the upper pipe 5 by the fixing screw 10, it is easy to replace the shock absorber 9A. In addition, since the valve body 9e is also fixed to the sealing portion 9b of the shock absorber 9A with the mounting screw 9f, it is easy to replace only the valve body 9e.

  Therefore, when the drop speed of the upper pipe 5 is too slow or too fast, it is possible to replace the shock absorber 9A itself, or by replacing the valve body 9e with one having a different communication hole 9e1 size. The falling speed can be easily set to a desired speed.

[Second Embodiment]
Hereinafter, the shock absorber according to the second embodiment will be described with reference to FIGS. 4 and 5. However, since the shock absorber 9B of the present embodiment is different from the above embodiment only in the configuration of the flow rate adjusting means, only the configuration thereof will be described in detail. In FIG. 5, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow.

  As shown in FIG. 4, the opening 9d1 on the internal space 4a side of the communication passage 9d of the shock absorber 9B is covered with a plate-shaped valve body 9g. The valve body 9g is attached to the end surface of the sealing portion 9b with a mounting screw 9h. Further, a predetermined gap is provided between the valve body 9g and the head of the mounting screw 9h, and a spring 9i (biasing member) that biases the valve body 9g to press against the opening 9d1 is disposed. Has been.

  The valve body 9g is formed with a communication hole 9g1 that allows the internal space 4a and the communication path 9d to communicate with each other while the valve body 9g covers the opening 9d1. The diameter of the communication hole 9g1 is smaller than that of the communication path 9d.

  Therefore, the valve body 9g is movable in the axial direction of the mounting screw 9h. Therefore, the opening 9d1 is closed by the valve body 9g when the support pipe 4 and the upper pipe 5 are fixed, and is opened when the valve body 9g moves against the urging force of the spring 9i. That is, in this embodiment, the flow rate adjusting means is configured by the valve body 9g and the spring 9i.

  Next, referring to FIG. 5, the function of the shock absorber 9 </ b> B when changing the relative position between the support pipe 4 and the upper pipe 5 in the Illrigator stand S will be described.

  As shown in FIG. 5A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the air pressure in the internal space 4a is increased. At this time, the opening 9d1 of the communication passage 9d is covered with the valve body 9g. However, the outside of the Irrrigger stand S and the internal space 4a are not completely shut off, but are in a state of being communicated via the communication hole 9g1 provided in the valve body 9g.

  Therefore, the air inside the internal space 4a is discharged to the outside through the communication hole 9g1 having a smaller diameter than the communication path 9d. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 5B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the air pressure in the internal space 4a is lowered. At this time, the valve element 9g is moved to the head side of the mounting screw 9h against the biasing force of the spring 9i by being pushed by the air flowing into the internal space 4a from the outside of the Illrigator stand S through the communication passage 9d, The opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Also with the shock absorber 9B of the present embodiment configured as described above, the same effect as that of the shock absorber 9A of the first embodiment can be obtained.

[Third Embodiment]
Hereinafter, the shock absorber according to the third embodiment will be described with reference to FIGS. 6 and 7. However, since the shock absorber 9C of the present embodiment is different only in the configuration of the shock absorber, the flow rate adjusting means, and the sealing portion of the above-described embodiment, only those structures will be described in detail. In FIG. 7, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow.

  As shown in FIG. 6, the opening 9d1 on the inner space 4a side of the communication passage 9d of the shock absorber 9C is covered with a plate-shaped valve body 9j (flow rate adjusting means) having flexibility. The valve body 9j is attached to the lower end portion of the sealing portion 9b with one mounting screw 9f.

  That is, the valve body 9j has a cantilever shape that covers the opening 9d1 at the free end on one side in the longitudinal direction and is fixed to the sealing portion 9b by the mounting screw 9f on the other side. Therefore, the opening 9d1 is closed by the valve body 9j when the support pipe 4 and the upper pipe 5 are fixed, and is opened when the valve body 9j is bent.

  A slit 9j1 is formed in the valve body 9j from the end of the valve body 9j away from the mounting screw 9f toward the center of the valve body 9j. The end of the slit 9j1 on the center side of the valve body 9j is located closer to the center of the communication path 9d than the edge of the communication path 9d with the valve body 9j covering the opening 9d1.

  Therefore, in the shock absorber 9C, in a state where the valve body 9j covers the opening 9d1, a communication hole having a smaller diameter than the opening 9d1 of the communication path 9d is formed by the slit 9j1 and the edge of the communication path 9d. The internal space 4a and the communication path 9d communicate with each other through the communication hole.

  A rod-shaped stopper 9k is provided in the opening 9d1 of the shock absorber 9C. When the valve body 9j covers the opening 9d1, the stopper 9k contacts the surface of the valve body 9j on the sealing portion 9b side (see FIG. 7A).

  Next, referring to FIG. 7, the function of the shock absorber 9 </ b> C when changing the relative position between the support pipe 4 and the upper pipe 5 in the Illrigator stand S will be described.

  As shown in FIG. 7A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the atmospheric pressure in the internal space 4a is increased. At this time, the opening 9d1 of the communication passage 9d is covered with the valve body 9j. However, the outside of the Irrrigger stand S and the internal space 4a are not completely shut off, but communicate with each other through a communication hole formed by the slit 9j1 provided in the valve body 9j and the edge of the communication passage 9d. It is in the state that was done.

  At this time, the valve body 9j contacts the edge of the communication passage 9d and the stopper 9k even when the air pressure in the internal space 4a suddenly increases due to a fast insertion operation or the like. 9j does not enter the communication path 9d.

  Therefore, the air inside the internal space 4a is formed by the slit 9j1 and the edge of the communication path 9d, and is discharged to the outside through a communication hole having a smaller diameter than the communication path 9d. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 7B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the air pressure in the internal space 4a is lowered. At this time, the valve body 9j is pushed and bent by the air flowing into the internal space 4a from the outside of the Irrrigger stand S via the communication passage 9d, and the opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Also with the shock absorber 9C of the present embodiment configured as described above, the same effects as those of the shock absorbers of the other embodiments can be obtained.

  In the present embodiment, in order to prevent the valve body 9j from being bent during the insertion operation, a stopper 9k that contacts the valve body 9j is provided in the opening 9d1 of the communication path 9d. However, the stopper 9k may be omitted if the bending of the valve body 9j can be sufficiently prevented only by the edge of the communication passage 9d.

[Fourth Embodiment]
Hereinafter, the shock absorber according to the fourth embodiment will be described with reference to FIGS. However, the shock absorber 9D of the present embodiment differs from the shock absorber of the above embodiment only in the configuration of the flow rate adjusting means and the sealing portion, and therefore only those configurations will be described in detail. In FIG. 9, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow.

  As shown in FIG. 8, the opening 9d1 on the inner space 4a side of the communication passage 9d of the shock absorber 9D is covered with a plate-shaped valve body 9l (flow rate adjusting means) having flexibility. The valve body 9l is attached to the lower end portion of the sealing portion 9b with one mounting screw 9f.

  That is, the valve body 9l has a cantilever shape that covers the opening 9d1 at the free end on one side in the longitudinal direction and is fixed to the sealing portion 9b by the mounting screw 9f on the other side. Therefore, the opening 9d1 is closed by the valve body 9l when the support pipe 4 and the upper pipe 5 are fixed, and is opened when the valve body 9l is bent.

  A communication hole 9b2 is formed at the lower end of the sealing portion 9b of the shock absorber 9D so that the internal space 4a communicates with the communication passage 9d in a state where the valve body 9l covers the opening 9d1. The communication hole 9b2 is provided at a position symmetrical to the mounting screw 9f across the axis of the shock absorber 9D. The diameter of the communication hole 9b2 is smaller than that of the opening 9d1.

  Next, referring to FIG. 9, the function of the shock absorber 9 </ b> D when changing the relative position between the support pipe 4 and the upper pipe 5 in the Illrigator stand S will be described.

  As shown in FIG. 9A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the air pressure in the internal space 4a is increased. At this time, the opening 9d1 of the communication passage 9d is covered with the valve body 9l. However, the outside of the Irrrigger stand S and the internal space 4a are not completely blocked, but are in a state of being communicated via the communication hole 9b2 provided in the sealing portion 9b.

  Therefore, the air inside the internal space 4a is discharged to the outside through the communication hole 9b2 having a smaller diameter than the communication path 9d. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 9B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the air pressure in the internal space 4a is lowered. At this time, the valve body 9l is pushed and bent by the air flowing into the internal space 4a from the outside of the Irrrigger stand S via the communication passage 9d, and the opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Even with the shock absorber 9D of the present embodiment configured as described above, the same effects as those of the shock absorbers of the other embodiments can be obtained.

  In the shock absorber 9D, the communication hole 9b2 is provided at a position symmetrical to the mounting screw 9f of the sealing portion 9b across the axis of the shock absorber 9D. However, like the modification shown in FIG. 10, the communication hole 9b2 may be provided at another position of the sealing portion 9b.

  Further, as in the modification shown in FIG. 11, the communication hole is formed with a groove 9b3 communicating with the communication passage 9d in the sealing portion 9b, and a part of the groove 9b3 is formed on the sealing portion 9b side of the valve body 9l. You may make it comprise by covering with a surface.

  In the shock absorber 9D of the modification shown in FIGS. 10 and 11, the region where the valve body 9l covers the lower end of the sealing portion 9b is wider than the shock absorber 9D of the present embodiment shown in FIG. Therefore, it is easy to omit the stopper 9k.

[Fifth Embodiment]
The shock absorber according to the fifth embodiment will be described below with reference to FIGS. However, the shock absorber 9E of the present embodiment is different from the shock absorber of the above embodiment only in the configuration of the flow rate adjusting means, and only the configuration thereof will be described in detail. In FIG. 14, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow.

  As shown in FIG. 12, the opening 9d1 on the internal space 4a side of the communication passage 9d of the shock absorber 9E is covered with a plate-shaped valve body 9m having flexibility. The valve body 9m is attached to the lower end portion of the sealing portion 9b with one mounting screw 9f.

  That is, the valve body 9m has a cantilever shape that covers the opening 9d1 at the free end on one side in the longitudinal direction and is fixed to the sealing portion 9b by the mounting screw 9f on the other side. Therefore, the opening 9d1 is closed by the valve body 9m when the support pipe 4 and the upper pipe 5 are fixed, and is opened when the valve body 9m is bent.

  A damper part 9n is disposed between the lower end of the sealing portion 9b of the shock absorber 9E and the valve body 9m.

  As shown in FIG. 13, an opening 9n1 having a shape matching the opening 9d1 of the communication path 9d is formed at the center of the damper part 9n. A slit 9n2 that communicates from the outer edge to the opening 9n1 is formed on one side of the opening 9n1. A hole 9n3 through which the attachment screw 9f is inserted is formed on the other side of the opening 9n1. In the shock absorber 9E, the damper part 9n having such a shape is disposed between the lower end portion of the sealing portion 9b and the valve body 9m.

  Therefore, in the shock absorber 9E, in a state where the valve body 9m covers the opening 9d1, the slit 9n2 of the damper part 9n, the edge of the communication path 9d, and the surface of the valve body 9m on the sealing part 9b side communicate with each other. A communication hole having a smaller diameter than the opening 9d1 of the passage 9d is formed, and the internal space 4a and the communication passage 9d communicate with each other through the communication hole. That is, in the shock absorber 9E, the valve body 9m and the damper part 9n constitute a flow rate adjusting means.

  Next, with reference to FIG. 14, the function of the shock absorber 9E when changing the relative position between the support pipe 4 and the upper pipe 5 in the Illrigator stand S will be described.

  As shown in FIG. 14A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the atmospheric pressure in the internal space 4a is increased. At this time, the opening 9d1 of the communication passage 9d is covered with the valve body 9m. However, the outside of the Irrrigger stand S and the internal space 4a are not completely cut off by the slit 9n2 of the damper part 9n, the edge of the communication path 9d, and the surface of the valve body 9m on the sealing part 9b side. It is in the state connected through the formed communicating hole.

  Therefore, the air inside the internal space 4a is formed by the slit 9n2 of the damper part 9n, the edge of the communication passage 9d, and the surface of the valve body 9m on the sealing portion 9b side, and a communication hole having a smaller diameter than the communication passage 9d. It will be discharged to the outside through. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 14B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the air pressure in the internal space 4a is lowered. At this time, the valve body 9m is pushed and bent by the air flowing into the internal space 4a from the outside of the Irrrigger stand S via the communication passage 9d, and the opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Also by the shock absorber 9E of the present embodiment configured as described above, the same effects as those of the shock absorbers of the other embodiments can be obtained.

  Further, in the shock absorber 9E of the present embodiment, the communication hole is formed by the slit 9n2 of the damper part 9n, the edge of the communication passage 9d, and the surface of the valve body 9m on the sealing portion 9b side. Therefore, the diameter of the communication hole can be changed only by changing the thickness of the damper part 9n or the width of the slit 9n2. As a result, the flow rate of air passing through the communication hole can be easily controlled, so that the drop speed can be controlled more easily.

[Sixth Embodiment]
Hereinafter, the shock absorber according to the sixth embodiment will be described with reference to FIGS. 15 to 18. However, about the structure which is common in the said embodiment, while attaching | subjecting the same code | symbol, description is abbreviate | omitted. In FIG. 17, a thick arrow indicates the moving direction of the support pipe or the shock absorber, and a thin arrow indicates the air flow. Moreover, the arrow of FIG. 18B shows the flow of the air which flows in into the internal space 4a from the outside.

  As shown in FIG. 15, the sealing portion 9b of the shock absorber 9F has a small diameter at the tip. An opening 9d1 of the communication path 9d and a communication hole 9b4 having a smaller diameter than the opening 9d1 are formed on the peripheral surface of the portion having the small diameter. A damper part 9o (flow rate adjusting means) is attached to the portion having the small diameter.

  As shown in FIG. 16, the damper part 9o has a shape in which a slit 9o1 extending in the axial direction is formed in a cylinder. The damper part 9o is formed of a flexible member.

  As shown in FIG. 15A, a plurality of holding portions 9b5 formed so as to protrude in the radial direction are formed at the distal end portion of the narrow portion of the sealing portion 9b. The sealing portion 9b holds the damper part 9o so as to be sandwiched between the lower end surface of the large diameter portion and the upper end surface of the holding portion 9b5. Therefore, the damper part 9o is restricted from moving in the axial direction of the shock absorber 9F.

  Further, an anti-rotation portion 9b6 formed so as to protrude in the radial direction is formed above the communication hole 9b4 in a portion having a small diameter of the sealing portion 9b. The rotation preventing portion 9b6 has a width corresponding to the width of the slit 9o1 of the damper part 9o, and is sandwiched between the slits 9o1 when the damper part 9o is attached to the sealing portion 9b. For this reason, the rotation of the damper part 9o around the axis of the shock absorber 9F is restricted by the rotation preventing portion 9b6.

  The opening 9d1 is covered with a damper part 9o. Therefore, the opening 9d1 is closed by the damper part 9o when the support pipe 4 and the upper pipe 5 are fixed (see FIG. 18A), and opened when the damper part 9o is bent (see FIG. 18B).

  The communication hole 9b4 is located below the rotation preventing portion 9b6 that fixes the position of the slit 9o1 of the damper part 9o. Therefore, the open state is maintained even when the support pipe 4 and the upper pipe 5 are fixed or when the damper part 9o is bent.

  Next, with reference to FIGS. 17 and 18, the function of the shock absorber 9 </ b> F when changing the relative position between the support pipe 4 and the upper pipe 5 in the irrigator stand S will be described.

  As shown in FIG. 17A, when the column pipe 4 is inserted into the upper pipe 5, the air in the internal space 4a is compressed, and the air pressure in the internal space 4a is increased. At this time, as shown in FIG. 18A, the damper part 9o covering the opening 9d1 of the communication path 9d is not deformed. However, the outside of the Irrrigger stand S and the internal space 4a are not completely shut off, but are in a state of being communicated via the communication hole 9b4 that is not covered by the damper part 9o.

  Therefore, the air inside the internal space 4a is discharged to the outside through the communication hole 9b4 having a smaller diameter than the communication path 9d. As a result, the resistance when the upper pipe 5 is inserted into the support pipe 4 is larger than the resistance during the pulling operation, but the resistance in the case of using a type of shock absorber in which the internal space 4a is completely sealed is used. Will be smaller.

  On the other hand, as shown in FIG. 17B, during the pulling-out operation from the upper pipe 5 of the support pipe 4, the air in the internal space 4a is expanded, and the air pressure in the internal space 4a is lowered. At this time, as shown in FIG. 18B, the damper part 9o is pushed and bent by the air flowing into the internal space 4a from the outside of the Illrigator stand S via the communication path 9d, and the opening 9d1 is opened. As a result, since air easily flows into the internal space 4a, the upper pipe 5 can be easily pulled out from the support pipe 4 with a small force.

  Even with the shock absorber 9F of the present embodiment configured as described above, the same effects as those of the shock absorbers of the other embodiments can be obtained.

[Other Embodiments]
Although the illustrated embodiment has been described above, the present invention is not limited to such a form.

  For example, in the above-described embodiment, an Irrrigator stand provided with a shock absorber is described. However, the shock absorber according to the present invention is not only applicable to the Illrigator stand, and can be used for articles of other configurations as long as it is a column composed of an outer cylinder and an inner member that can be inserted into and removed from the outer cylinder. It can be adopted.

  In the first to fifth embodiments, the valve body is fixed when the support pipe and the upper pipe are fixed (that is, when the relative position is not changed) and when the outer cylinder is inserted into the inner member. The opening of the communication path is covered, and the opening is opened during the pulling operation. This is because when the sudden drop of the upper pipe 5 with respect to the support pipe 4 occurs unexpectedly, the drop speed is quickly reduced.

  However, the present invention is not limited to such a configuration, and the valve body opens the opening when the support pipe and the upper pipe are fixed and when the inner member is pulled out from the outer cylinder, You may comprise so that an opening part may be closed at the time of insertion operation | movement.

  For example, as in the second embodiment, when the flow rate adjusting means is composed of a valve body 9g and a spring 9i that biases the valve body 9g, the spring 9i is connected to the valve body 9g and the head of the mounting screw 9h. It may be arranged between the valve body 9g and the sealing portion 9b (see FIG. 5).

  Moreover, in the said 3rd-6th embodiment, the flow volume adjustment means is comprised using the valve body comprised with the plate-shaped member which has flexibility. However, as in the second embodiment, the flow rate adjusting means may be configured using a valve body and a spring that biases the valve body.

  Further, in the shock absorber 9C of the third embodiment, a stopper 9k that contacts the valve body 9j is provided in the opening 9d1 of the communication passage 9d in order to prevent the valve body 9j from being bent during the insertion operation. Yes. However, the configuration of providing such a stopper is not applied only to the shock absorber 9C of the third embodiment. For example, the present invention may be applied to the shock absorbers of the other embodiments described above.

DESCRIPTION OF SYMBOLS 1 ... Base part, 2 ... Leg part, 3 ... Caster, 4 ... Support pipe (outer cylinder), 4a ... Internal space, 5 ... Upper pipe (inner member), 5a ... Upper pipe side fixing hole, 6 ... Suspension tool, 7 ... fixed handle, 8 ... handle, 9A, 9B, 9C, 9D, 9E, 9F ... shock absorber, 9a ... insertion part, 9a1 ... shock absorber side fixing hole, 9b ... sealing part, 9b1 ... annular recess, 9b2 ... communication Hole, 9b3 ... groove, 9b4 ... communication hole, 9b5 ... holding part, 9b6 ... rotation preventing part, 9c ... O-ring, 9d ... communication path, 9d1 ... opening, 9e, 9g, 9j, 9l, 9m ... valve body 9e1, 9g1 ... communication holes, 9f, 9h ... mounting screws, 9i ... springs (biasing members), 9j1 ... slits, 9k ... stoppers, 9n ... damper parts, 9n1 ... openings, 9n2 ... slits, 9n3 ... holes, 9o ... Damper parts, 9o1 ... Slit 10 ... fixing screws, S ... stand.

Claims (7)

A shock absorber provided on an inner member that can be inserted into and removed from an outer cylinder, and capable of sliding in close contact with an inner peripheral surface of the outer cylinder when the inner member is inserted into the outer cylinder,
A communication path for communicating the internal space of the outer cylinder with the outside;
A communication hole having a smaller diameter than the communication path;
When the inner member is inserted into the outer cylinder, the opening of the communication path is closed and fluid is circulated through the communication hole, and the opening of the inner member is extracted from the outer cylinder. And a flow rate adjusting means for releasing the shock absorber. The shock absorber according to claim 1,
The flow rate adjusting means is in a position covering the opening when the outer cylinder and the inner member are fixed and when the inner member is inserted into the outer cylinder, and closes the opening. When the material is pulled out from the outer cylinder, the opening is opened by being pushed away from the opening by the force received from the fluid flowing into the internal space from the outside through the communication path. A shock absorber characterized. The shock absorber according to claim 1,
The flow rate adjusting means is at a position away from the opening when the outer cylinder and the inner member are fixed and when the inner member is pulled out from the outer cylinder, and opens the opening. When the material is inserted into the outer cylinder, the opening is closed by being pushed in a direction to cover the opening by a force received from the fluid that flows out from the internal space to the outside through the communication path. A shock absorber. The shock absorber according to claim 2,
The flow rate adjusting means is a flexible valve body that covers the opening,
The said valve body bends with the force received from the fluid which flows in into the said internal space from the said outside through the said communicating path, The buffer device characterized by the above-mentioned. The shock absorber according to claim 2 or claim 4,
The flow rate adjusting means includes a valve body that covers the opening, and an urging member that urges the valve body to press the opening.
The said valve body moves with the force received from the fluid which flows in into the said internal space from the said outside via the said communicating path, The buffer device characterized by the above-mentioned. The shock absorber according to claim 4 or 5,
The communication device is characterized in that the communication hole is formed in the valve body.   The support | pillar comprised by the buffering device of any one of Claims 1-6, the said outer cylinder, and the said inner member.