JP2017036786A - gas spring - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a gas spring which inhibits cost increase and inhibits scattering of a leaked lubricant.SOLUTION: A gas spring includes: a cylinder 11 in which one end side is closed and the other end side is open; an opening closing member 13 provided at an opening 12 of the cylinder 11; a piston 16 which is provided so as to slide in the cylinder 11; a piston rod 17 in which one end side is connected to the piston 16 and the other end side is extended to the outside through the opening closing member 13; a gas G and a lubricant L sealed in the cylinder 11; and a scattering inhibition member 21 which covers the opening 12 of the cylinder 11 at an outer side of the opening closing member 13 to inhibit scattering of the lubricant L leaking from the opening 12 to the outside.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a gas spring.

  There is a gas spring for opening a smoke exhaust window (see, for example, Patent Document 1). Some gas springs are provided with a temperature compensation device to prevent a reduction in repulsive force due to a decrease in outside air temperature (see, for example, Patent Document 2). Some gas springs can suppress an increase in internal pressure even in a high-temperature atmosphere (see, for example, Patent Document 3).

Japanese Patent Laid-Open No. 01-287387 Japanese Patent Laid-Open No. 10-227324 JP 2014-109288 A

  In particular, gas springs installed in buildings may be exposed to a high-temperature atmosphere when a fire breaks out in the building. In such a situation, the internal pressure of the gas spring rises and the internal lubricant leaks and splashes outside. There is a possibility that. The gas spring capable of suppressing the increase in internal pressure is expensive.

  Accordingly, an object of the present invention is to provide a gas spring that can suppress the scattering of the leaked lubricating liquid while suppressing an increase in cost.

  In order to achieve the above-described object, the present invention is configured to provide a scattering suppression member that covers the opening of the cylinder outside the opening closing member and suppresses the scattering of the lubricating liquid leaking from the opening to the outside.

  According to the present invention, it is possible to suppress scattering of the leaked lubricating liquid while suppressing an increase in cost.

It is a perspective view which shows the usage example of the gas spring of 1st Embodiment which concerns on this invention. The gas spring of 1st Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is AA sectional drawing of (a). The gas spring of 2nd Embodiment which concerns on this invention is shown, (a) is front sectional drawing, (b) is BB sectional drawing of (a). The gas spring of 3rd Embodiment which concerns on this invention is shown, (a) is front sectional drawing, (b) is CC sectional drawing of (a). The gas spring of 4th Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is DD sectional drawing of (a). The gas spring of 5th Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is EE sectional drawing of (a). The gas spring of 6th Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is FF sectional drawing of (a). The gas spring of 7th Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is GG sectional drawing of (a). The gas spring of 8th Embodiment which concerns on this invention is shown, (a) is a front sectional view, (b) is HH sectional drawing of (a).

“First Embodiment”
1st Embodiment which concerns on this invention is described based on FIG. 1 and FIG.

  FIG. 1 shows a smoke exhaust window 1. The smoke exhaust window 1 is installed at the upper part of the wall of the building, and has a fixed frame 4 which is a member on the building side and is fixed to the building with a window opening 3 which communicates the inside and outside of the building, and a fixed frame. And a window 5 for opening and closing the four window openings 3. The window 5 includes a window glass 6 and a movable frame 7 that is attached to the window glass 6 so as to surround the entire periphery thereof, and holds the window glass 6, and the lower edge of the movable frame 7 is below the fixed frame 4. The edge is slidably connected via a hinge (not shown). The window 5 closes the window opening 3 in a posture along the vertical, and opens the window opening 3 by swinging toward the outside of the building.

  Between the fixed frame 4 on the building side and the movable frame 7 on the window 5 side, the gas spring 10 according to the first embodiment for biasing the window 5 in the opening direction and controlling the opening speed is attached. A locking mechanism (not shown) that locks the movable frame 7 of the window 5 in a state of closing the window opening 3 to the fixed frame 4 is provided between the fixed frame 4 and the movable frame 7. When the lock is released, the gas spring 10 opens the window 5 with its urging force, and the window 5 is stopped at a predetermined angular position by a stopper mechanism (not shown).

  As shown in FIG. 2A, the gas spring 10 according to the first embodiment includes a bottomed cylindrical cylinder 11 that is closed at one end and opened at the other end, and a cylinder opening 12 at the other end of the cylinder 11. An opening closing member 13 provided so as to close the piston, a piston 16 slidably provided in the cylinder 11 and dividing the inside of the cylinder 11 into two chambers 14 and 15, and one end side connected to the piston 16 and the like. An end side has a piston rod 17 extending to the outside of the cylinder 11 through the opening closing member 13.

  In addition, the gas spring 10 includes a disk 18 provided on the piston rod 17 extending side of the piston 16, a seal member 19 provided between the opening closing member 13 in the cylinder 11 and the piston 16, and the cylinder 11. A cylinder bracket 20 fixed to the end opposite to the protruding side of the piston rod 17 by welding, and a cover 21 (scattering suppression member) that covers the outside of the opening closing member 13 of the cylinder opening 12; Yes. A pressurized gas G such as compressed air or compressed nitrogen gas and a lubricating liquid L such as an oil liquid are sealed in the cylinder 11.

  The opening closing member 13 is a rod guide that guides the movement of the piston rod 17 at the outer end position in the cylinder 11 and suppresses the deflection thereof. The seal member 19 seals between the piston rod 17 and the cylinder 11 at a position inside the opening closing member 13 in the cylinder 11. The seal member 19 is installed in the cylinder 11 in a state where the seal member 19 is in contact with the opening closing member 13 by the pressure in the chamber 15 of the cylinder 11. The gas spring 10 of the first embodiment is of a type that does not have a free piston in the cylinder 11. It should be noted that a coil spring may be provided in the chamber 14 so that the urging force due to the pressure of the gas G is supplemented by the spring force, or the spring characteristics may be adjusted.

  The piston rod 17 is welded to a rod body 22 having one end connected to the piston 16 and the other end extending to the outside of the cylinder 11 through the opening closing member 13, and an end of the rod body 22 on the protruding side from the cylinder 11. Rod bracket 23 fixed by the

  As shown in FIG. 1, the gas spring 10 is arranged in a so-called inverted state so that the cylinder 11 is on the upper side and the piston rod 17 is on the lower side, and the rod bracket 23 of the piston rod 17 is rotatable to the fixed frame 4. The cylinder bracket 20 of the cylinder 11 is rotatably connected to the movable frame 7 of the window 5. When the window 5 closes the window opening 3, the gas spring 10 is in a contracted state along the substantially vertical direction and the piston rod 17 enters the cylinder 11 most, and when the window 5 opens the window opening 3. The piston rod 17 is in an extended state in which the amount of protrusion from the cylinder 11 is increased.

  As shown in FIG. 2A, the cylinder 11 includes a substantially cylindrical steel body member 30 and a steel closing member 31 that closes one end side of the body member 30. The body member 30 is formed in a cylindrical main body portion 32 which mainly constitutes the body member 30 and an intermediate position on the opposite side of the closing member 31 of the main body portion 32 and is radially inward from the outer peripheral surface of the main body portion 32. And an annular annular small-diameter portion 33 that protrudes inward in the radial direction from the inner peripheral surface of the main body portion 32. The annular small-diameter portion 33 restricts the passage of the piston 16 on the side of the closing member 31 further than this and makes contact with the seal member 19. When the piston 16 contacts the annular small-diameter portion 33, The connected piston rod 17 cannot extend from the cylinder 11 any more, that is, the gas spring 10 is in the maximum length state.

  The body member 30 is recessed radially inward from the outer peripheral surface of the main body portion 32 at a position of the cylinder opening 12 that is the end opposite to the closing member 31 and has a diameter that is larger than the inner peripheral surface of the main body portion 32. An annular annular step 34 that protrudes inward in the direction is formed. The opening closing member 13 is held by the annular step portion 34 so as not to come off the cylinder 11. The annular small-diameter portion 33 and the annular step portion 34 are both plastic deformation portions formed by caulking the cylindrical member 30 to the cylindrical material.

  The closing member 31 has a spherical shape, and is fixed to an end of the body member 30 on the opposite side to the cylinder opening 12 in a posture that protrudes outward. The closing member 31 is welded to the end of the body member 30 over the entire circumference without any gap. As a result, the cylinder 11 has an annular welded portion 37 on the outer peripheral portion at the boundary position between the body member 30 and the closing member 31. A through hole 38 is formed at the center of the closing member 31 so as to extend along the axial direction on the central axis of the body member 30.

  The cylinder bracket 20 is made of steel, and has an L-shaped attachment plate 42 having a plate portion 40 and a plate portion 41 extending perpendicularly to the plate portion 40, and the plate portion 40 to the plate portion 41. And a shaft member 43 fixed to the plate portion 40 so as to protrude. An attachment hole 44 is formed in the plate portion 41 so as to penetrate in the plate thickness direction. In the cylinder bracket 20, the plate portion 40 is welded to the closing member 31 without a gap over the entire circumference in a state where the shaft member 43 is inserted into the through hole 38 of the closing member 31. As a result, the cylinder 11 has an annular welded portion 45 at the boundary position between the closing member 31 and the plate portion 40. When the closing member 31 and the body member 30 are welded and the closing member 31 and the cylinder bracket 20 are welded, the cylinder 11 is sealed on the cylinder bracket 20 side in the axial direction, and only the cylinder opening 12 opens to the outside. The mounting hole 44 is along the direction perpendicular to the axis of the cylinder 11. In the present embodiment, the cylinder bracket 20 is made of steel, but may be made of resin or aluminum.

  The piston 16 is made of an annular steel piston main body 48 that is in sliding contact with the body member 30 of the cylinder 11, and an elastic rubber material that is held by the piston main body 48 and seals a gap between the piston main body 48 and the body member 30. And a piston seal 49. The piston main body 48 is formed with a through hole 51 penetrating in the axial direction at the center in the radial direction.

  The piston main body 48 is formed with an annular seal holding groove 55 that is recessed radially inward in the center of the outer peripheral portion in the axial direction, and is radially inward of the seal holding groove 55 and more radially than the through hole 51. A plurality of flow paths 56 that penetrate the piston body 48 along the axial direction are formed on the outer side at equal intervals in the circumferential direction. When the piston 16 moves together with the piston rod 17, the working fluid flows through the flow path 56. As described above, the piston 16 is disposed between the annular small diameter portion 33 and the closing member 31 in the cylinder 11.

  The rod body 22 of the piston rod 17 is made of steel, and has a cylindrical main shaft portion 61 having a constant diameter, a guide shaft portion 62 having an outer diameter smaller than the main shaft portion 61 provided on one end side of the main shaft portion 61, and The guide shaft portion 62 has a connecting portion 63 provided on the opposite side of the main shaft portion 61 and connected to the piston 16. The connecting portion 63 is inserted into the through hole 51 of the piston 16, and then the end portion on the side opposite to the main shaft portion 61 is crimped to connect the piston 16 to the piston rod 17 so as not to move in the axial direction. The piston rod 17 protrudes from the cylinder 11 to the outside through the seal member 19 and the opening closing member 13 in the main shaft portion 61.

  The disk 18 is made of steel and has an annular shape, and the guide shaft portion 62 of the piston rod 17 is inserted through the inner periphery thereof. The disc 18 is movable in the axial direction by a predetermined amount with respect to the piston 16 and the piston rod 17 by the guide shaft 62 of the piston rod 17. The disk 18 closes the flow path 56 in contact with the piston 16, and opens the flow path 56 when separated from the piston 16 by the guide shaft 62. Although not shown in the drawing, the disk 18 is formed with a notch that allows the two chambers 14 and 15 to always communicate with each other via the flow path 56. The disk 18 opens and closes the flow path 56 by making contact with and separating from the piston 16. Note that the flow path 56 may be opened and closed by bending, with the disk 18 being unable to move in the axial direction with respect to the piston 16 and the piston rod 17. In this embodiment, the disk 18 is made of steel, but may be formed of resin or aluminum.

  When the disk 18 is in contact with the piston 16, the fluid is allowed to move through an orifice formed by the flow path 56 of the piston 16 and a notch (not shown) of the disk 18. This increases the flow path resistance of the fluid and increases the damping force. At this time, the orifice becomes an opening at one end of the flow path 56. On the other hand, when the disk 18 moves away from the piston 16 and opens the flow path 56, the fluid is allowed to move through the flow path 56. As a result, the flow path resistance of the fluid decreases and the damping force decreases. The moving speed of the piston rod 17 with respect to the cylinder 11 is controlled by adjusting the damping force.

  The opening closing member 13 is a resin such as nylon or phenol, and an insertion hole 70 is formed at the center, and the main shaft portion 61 of the piston rod 17 is inserted inside the opening hole 70. In the opening closing member 13, a large diameter portion 71 and a small diameter portion 72 having a smaller diameter than the large diameter portion 71 are formed on the outer side in the radial direction. The opening closing member 13 is fitted to the cylinder 11 before caulking at the large diameter portion 71 in a state where the piston rod 17 is inserted inside the insertion hole 70. In this state, when the end portion on the cylinder opening 12 side of the cylinder 11 is crimped to form the annular step portion 34, the end surface on the small diameter portion 72 side of the large diameter portion 71 abuts on the annular step portion 34. Thus, the opening of the opening closing member 13 from the cylinder 11 is restricted. In the present embodiment, the opening closing member 13 is made of resin, but may be made of steel or aluminum. However, in order to prevent the cylinder 11 from being destroyed, it is preferable to use a resin.

  The seal member 19 is made of synthetic rubber, and has an annular base 80, an annular lip-shaped rod-side seal 81 extending radially inward from the base 80, and a radially outer side. There is an annular lip-shaped cylinder-side seal portion 82 extending from the base portion 80 to the same side as the axial-side rod-side seal portion 81.

  The seal member 19 is configured such that the base 80 is brought into contact with the end surface of the opening closing member 13 on the large diameter portion 71 side in the axial direction, the piston rod 17 is inserted inside the rod side seal portion 81, and the cylinder side seal. The part 82 is fitted into the cylinder 11. At that time, the seal member 19 abuts against the piston rod 17 with the allowance at the rod side seal portion 81, and abuts against the cylinder 11 at the cylinder side seal portion 82 with the allowance, and between the piston rod 17 and the cylinder 11. To seal. Moreover, the seal member 19 is pressed against the piston rod 17 by the force of the gas G in the cylinder 11 in the direction in which the rod side seal portion 81 narrows toward the inner diameter side, and the cylinder side seal portion 82 expands toward the outer diameter side. By receiving force in the direction and being pressed against the cylinder 11, the sealing performance is further improved. Further, the seal member 19 is configured such that the base 80 is pressed against the opening closing member 13 by the pressure of the gas G in the cylinder 11 and presses the opening closing member 13 in the axial direction so that the large-diameter portion 71 is formed in the annular shape of the cylinder 11. It abuts on the stepped portion 34. Note that the seal member 19 is disposed at the lower end position of the chamber 15, and therefore, the lubricating liquid L accumulates on the seal member 19 due to gravity.

  The rod bracket 23 is made of steel and is formed in an L shape having a plate portion 83 and a plate portion 84 extending perpendicularly to the plate portion 83. A mounting hole 85 is formed in the plate portion 84 so as to penetrate in the plate thickness direction. The rod bracket 23 is fixed to the end of the piston rod 17 opposite to the piston 16 in the axial direction by welding. In this state, the mounting hole 85 is perpendicular to the axial direction of the piston rod 17. In the present embodiment, the rod bracket 23 is made of steel, but may be made of resin or aluminum.

  The cover 21 is made of rubber or resin, is provided on the outer peripheral side of the body member 30 of the cylinder 11, and extends in the same side as the piston rod 17 from the cylinder 11. And a lid portion 92 extending from the extending distal end side of 91 to the piston rod 17.

  The cylindrical portion 91 includes a cylindrical main body portion 95 and an annular convex portion 96 that protrudes inward in the radial direction from an end portion of the main body portion 95 opposite to the lid portion 92. As shown in FIG. 2B, the lid portion 92 has a perforated disk shape in which a circular insertion hole 97 is formed at the center. As shown in FIG. 2A, the main body portion 95 has an inner diameter that is substantially the same as the outer diameter of the main body portion 32 of the cylinder 11, and the convex portion 96 has an inner diameter that is smaller than that of the annular small diameter portion 33. The outer diameter is substantially the same as the minimum outer diameter. The diameter of the insertion hole 97 is slightly larger than the outer diameter of the main shaft portion 61 of the piston rod 17.

  When the cover 21 is attached, the piston rod 17 is in a state where the rod bracket 23 is not attached to the rod body 22, and the rod body 22, the piston 16, the seal member 19, and the opening closing member 13 are attached to the cylinder 11. It is in a state. In this state, the rod body 22 extending outward from the cylinder 11 via the opening closing member 13 is inserted into the insertion hole 97, and the cylinder opening 12 side of the cylinder 11 is fitted into the cylindrical portion 91 of the cover 21. Combine. When the convex portion 96 of the cylindrical portion 91 is aligned with the position of the annular small diameter portion 33 of the cylinder 11, the convex portion 96 is fitted into the annular small diameter portion 33, and the main portion 95 of the cover 21 is the main portion 32 of the cylinder 11. To fit. Then, the cylindrical portion 91 is provided on the outer peripheral side of the cylinder 11 and extends from the cylinder 11 to the same side as the piston rod 17, and the lid portion 92 extends from the extending distal end side of the cylindrical portion 91. It will be in the state extended to. Thereafter, the rod bracket 23 is welded to the rod body 22.

  As described above, the gas spring 10 includes the fixed frame 4 on the building side of the smoke exhaust window 1 and the movable frame 7 on the window 5 side with the piston rod 17 on the lower side and the cylinder 11 on the upper side. It will be attached between. In this state, the cylinder 11 is in a state in which the cylinder opening 12 is disposed on the lower side and the closing member 31 is disposed on the upper side, and the cover 21 is attached to the lower portion of the cylinder 11. Further, the lubricating liquid L accumulates on the upper side of the seal member 19 and comes into contact with the piston rod 17.

  In a state in which the window 5 closes the window opening 3, the gas spring 10 minimizes the amount of protrusion of the piston rod 17 from the cylinder 11, and the piston 16 is positioned closest to the closing member 31 of the cylinder 11. At this time, a biasing force is generated in the gas spring 10 in a direction in which the piston rod 17 protrudes from the cylinder 11 to the piston 16 due to the pressure of the gas G in the cylinder 11 and the pressure receiving area difference of the piston 16. Therefore, when the lock of the movable frame 7 to the fixed frame 4 is released by a lock mechanism (not shown), the gas spring 10 extends so as to increase the protruding amount of the piston rod 17 from the cylinder 11, and the movable frame 7 is The window 5 is opened by pressing. At this time, the gas G flows from the chamber 15 to the chamber 14 by the movement of the piston 16, but the pressure of the chamber 15 becomes higher than the pressure of the chamber 14, so that the disk 18 is in contact with the piston 16. Become. Therefore, the flow path 56 of the piston 16 allows the chamber 14 and the chamber 15 to communicate with each other only through an orifice between the notch (not shown) of the disk 18 and the flow path 56, and the flow resistance of the gas G Increases and the damping force increases. Thereby, the opening speed of the movable frame 7 is reduced.

  On the other hand, when the window 5 is opened by, for example, manually pressing the movable frame 7 from the state in which the window 5 opens the window opening 3, the gas spring 10 reduces the protrusion amount of the piston rod 17 from the cylinder 11. It will be shortened. At this time, the gas G flows from the chamber 14 to the chamber 15 due to the movement of the piston 16, but the pressure in the chamber 14 becomes higher than the pressure in the chamber 15, so that the disk 18 moves away from the piston 16. Therefore, since the flow path 56 of the piston 16 is entirely opened and the chamber 14 and the chamber 15 are communicated with each other, the flow resistance of the gas G is reduced and the damping force is reduced. Thereby, the window 5 can be closed with a small operating force.

  When a fire occurs and the gas spring 10 is exposed to a high-temperature atmosphere, the internal pressure rises, and the opening closing member 13 deforms the annular stepped portion 34 of the cylinder 11, so that the opening closing member 13 and the seal member 19. May escape from the cylinder 11 and the lubricating liquid L enclosed inside may be ejected. Even in such a case, since the cover 21 covers the cylinder opening 12 outside the opening closing member 13, the gas spring 10 suppresses the scattering of the lubricating liquid L leaking from the cylinder opening 12 to the outside. become.

  Patent Document 1 described above discloses a gas spring for opening a smoke exhaust window. This gas spring increases the internal pressure when a fire occurs in a building and is exposed to a high temperature atmosphere. End up. When the internal pressure rises in this manner, the gas spring may be damaged, for example, and the parts may be scattered, or the lubricating liquid sealed inside may be scattered over a wide range. Further, in the gas spring of Patent Document 2, it is possible to prevent a reduction in repulsive force due to a decrease in outside air temperature by a temperature compensation device. However, even in this gas spring, if a fire occurs and is exposed to a high temperature atmosphere, The internal pressure rises, and for example, there is a possibility that parts are scattered due to breakage, or the lubricating liquid sealed inside is scattered widely. In the gas spring of Patent Document 3, when a fire occurs and is exposed to a high-temperature atmosphere, the deformable member deforms and melts at an early stage before the oil liquid reaches the boiling point, causing the gas in the cylinder to leak out. Although an increase in internal pressure is suppressed, the structure is complicated and the cost is increased.

  In contrast, in the gas spring 10 of the first embodiment, the cover 21 covers the cylinder opening 12 outside the opening closing member 13 and the lubricant L leaking from the cylinder opening 12 is scattered from the cover 21 to the outside. Therefore, the structure is simplified and an increase in cost can be suppressed. Therefore, it is possible to suppress the leakage of the lubricating liquid L leaked while suppressing an increase in cost.

  Further, the cover 21 is provided on the outer peripheral side of the cylinder 11 and extends from the cylinder 11 to the same side as the piston rod 17, and extends from the extending front end side of the cylindrical portion 91 to the piston rod 17. Therefore, the structure for suppressing scattering is simplified, and the increase in cost can be further suppressed.

  Moreover, since the cover 21 covers the part which protrudes rather than the cylinder 11 of the piston rod 17, the piston rod 17 can be protected. Therefore, it is possible to prevent the piston rod 17 from being dented and prevent rust.

  Moreover, since the gas spring 10 is provided in the smoke exhaust window 1, there is a possibility that a fire may occur at the installation location and the gas spring 10 may be exposed to a high temperature atmosphere.

  Here, the opening closing member 13 is not deformed during normal operation of the gas spring 10, that is, when the gas spring 10 is in a predetermined normal temperature range, and is deformed at a predetermined temperature below the boiling point of the lubricating liquid L to open the cylinder opening. 12 may be opened, and the gas G in the cylinder 11 may be gradually leaked out (specifically, tin or tin alloy). If comprised in this way, it can suppress that the opening closing member 13 collides with the cover 21. FIG.

  Further, the opening closing member 13 is not deformed during normal operation of the gas spring 10, that is, when the gas spring 10 is in a predetermined normal temperature range, and deforms at a predetermined temperature below the boiling point of the lubricating liquid L and foams when deformed. Alternatively, it may be formed of a material (specifically, a material in which a thermal expansion material is mixed with a rubber or resin material) that can be held including the lubricating liquid L. With this configuration, the opening closing member 13 foams in the space between the cover 21, the cylinder 11, and the piston rod 17 to form a filter and holds the lubricating liquid L. The lubricating liquid L can be prevented from leaking from between the piston rod 17 and the piston rod 17.

“Second Embodiment”
Next, a second embodiment according to the present invention will be described mainly with reference to FIG. 3 with a focus on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  As illustrated in FIG. 3A, the gas spring 10 </ b> A according to the second embodiment includes a cover 21 </ b> A having a lid portion 92 </ b> A that is partially different from the cover 21, and a screw member 101. As shown in FIG. 3B, the lid portion 92 </ b> A of the cover 21 </ b> A crosses the insertion hole 97 and extends from the insertion hole 97 to one position of the outer peripheral portion, and is on one side with respect to the cut 102. An insertion hole 104 is formed in the screw hole 103 on the opposite side of the cut 102. The lid portion 92A is divided in the circumferential direction by the cut 102, and the screw member 101 inserted from the insertion hole 104 is screwed into the screw hole 103, whereby the cut portion by the cut 102 is connected.

  At the time of attaching the cover 21A, the rod rod 23 is already welded to the rod body 22 and the piston rod 17, piston 16, seal member 19 and opening closing member 13 are attached to the cylinder 11. It has become. In this state, the rod bracket 23 of the piston rod 17 extending from the cylinder 11 to the outside via the opening closing member 13 is inserted into the insertion hole 97 with the slit 102 widened, so that the cylinder opening 12 side of the cylinder 11 is closed. Is fitted to the cylindrical portion 91 of the cover 21A. When the convex portion 96 of the cylindrical portion 91 is aligned with the position of the annular small diameter portion 33 of the cylinder 11, the convex portion 96 is fitted into the annular small diameter portion 33, and the main portion 95 of the cover 21 is the main portion 32 of the cylinder 11. To fit. In this state, the screw member 101 is inserted from the insertion hole 104 and screwed into the screw hole 103 to connect the parted portion by the cut 102 of the lid portion 92A. In this state, the cylindrical portion 91 is provided on the outer peripheral side of the cylinder 11 and extends to the same side as the piston rod 17 relative to the cylinder 11, and the lid portion 92 </ b> A is a piston from the extending front end side of the cylindrical portion 91. The state extends to the rod 17. Here, the cover 21A is made of rubber or resin so that the cut line 102 can be widened.

  According to such 2nd Embodiment, since the cover 21A has covered the cylinder opening 12 outside the opening closing member 13, it suppresses scattering of the lubricating liquid L leaking from the cylinder opening 12 to the outside. become. Further, since the piston rod 17 with the rod bracket 23 welded to the rod body 22 can be assembled to the cylinder 11, productivity can be improved.

“Third Embodiment”
Next, a third embodiment according to the present invention will be described mainly based on FIG. 4 with a focus on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10 </ b> B of the third embodiment includes a cover 21 </ b> B having a cylindrical part 91 </ b> B that is partially different from the cover 21, and a cylinder 11 </ b> B having a main part 32 </ b> B that is partially different from the cylinder 11. The cylindrical portion 91B of the cover 21B is not formed with the convex portion 96, and a female screw 111 is formed on the inner peripheral portion of a predetermined range opposite to the lid portion 92 of the main body portion 95B. Further, the cylinder 11B is formed with a male screw 112 on the outer peripheral portion on the cylinder opening 12 side with respect to the annular small diameter portion 33 of the main body portion 32B.

  When the cover 21B is attached, the piston rod 17 is in a state where the rod bracket 23 is not attached to the rod body 22, and the rod body 22, piston 16, seal member 19 and opening closing member 13 are attached to the cylinder 11B. It is in a state. In this state, the rod main body 22 extending outside from the cylinder 11B through the opening closing member 13 is inserted into the insertion hole 97, and the male screw 112 on the cylinder opening 12 side of the cylinder 11B is inserted into the cylindrical portion 91B. And screwed into the female thread 111 of the main body portion 95B. Then, the cylindrical portion 91B is provided on the outer peripheral side of the cylinder 11B and extends to the same side as the piston rod 17 relative to the cylinder 11B, and the lid portion 92 extends from the extending distal end side of the cylindrical portion 91B. It will be in the state extended to. Thereafter, the rod bracket 23 is welded to the rod body 22.

  According to such 3rd Embodiment, since the cover 21B has covered the cylinder opening 12 outside the opening closing member 13, it suppresses scattering of the lubricating liquid L which leaks from the cylinder opening 12 to the exterior. become. Further, when the cover 21B is attached to the cylinder 11B, the cover 21B may be screwed into the cylinder 11B, so that the cover 21B can be easily attached to the cylinder 11B.

“Fourth Embodiment”
Next, a fourth embodiment according to the present invention will be described mainly based on FIG. 5 with a focus on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10 </ b> C of the fourth embodiment includes a cover 21 </ b> C that is partially different from the cover 21, and a plurality, specifically, two screw members 121 as shown in FIG. 5B. The cover 21 </ b> C includes a pair of divided bodies 122. As shown in FIG. 5A, the divided body 122 includes a semi-cylindrical semi-cylindrical portion 125 and a semi-disc-shaped half lid portion 126. The semi-cylindrical part 125 includes a semi-cylindrical main body part 127 and a semicircular convex part that protrudes inward in the bending direction of the main body part 127 from the end of the main body part 127 opposite to the half lid part 126. 128. A semicircular recess 129 is formed in the half lid portion 126 as shown in FIG. The divided body 122 has a screw hole 103 </ b> C on one side and a insertion hole 104 </ b> C on the opposite side across the recess 129.

  When the cover 21C is attached, the piston rod 17 is in a state where the rod bracket 23 is already welded to the rod body 22 and the piston rod 17, piston 16, seal member 19 and opening closing member 13 are attached to the cylinder 11. It has become. In this state, the pair of divided bodies 122 are arranged such that each convex portion 128 is fitted to the annular small diameter portion 33 and each main body portion 127 is in contact with the main body portion 32 of the cylinder 11. In this state, in the pair of divided bodies 122, the semi-cylindrical portions 125 are in contact with each other, and the semi-cover portions 126 are in contact with each other. One screw member 101 is inserted into the insertion hole 104C of one divided body 122 and screwed into the screw hole 103 of the other divided body 122, and the other screw member 101 is inserted into the insertion hole 104C of the other divided body 122. However, by screwing into the screw hole 103 of one of the divided bodies 122, the pair of divided bodies 122 are integrated into the cover 21C.

  The cover 21 </ b> C is a cylindrical tube in which a pair of semi-cylindrical portions 125 of the pair of divided bodies 122 are provided on the outer peripheral side of the body member 30 of the cylinder 11 and extend to the same side as the piston rod 17 rather than the cylinder 11. The pair of half-cover portions 126 of the pair of divided bodies 122 become the perforated disc-shaped lid portions 92C extending from the extending distal end side of the cylindrical portion 91C to the piston rod 17. Further, the pair of convex portions 128 becomes an annular convex portion 96C, and the pair of concave portions 129 becomes an insertion hole 97C.

  According to the fourth embodiment, since the cover 21C covers the cylinder opening 12 outside the opening closing member 13, it is possible to suppress the scattering of the lubricating liquid L leaking from the cylinder opening 12 to the outside. become. Further, since the piston rod 17 with the rod bracket 23 welded to the rod body 22 can be assembled to the cylinder 11, productivity can be improved.

“Fifth Embodiment”
Next, a fifth embodiment according to the present invention will be described mainly with reference to FIG. 6 with a focus on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10D of the fifth embodiment is provided with a cover 21 and a cover 141 different from this. The cover 141 is made of rubber or resin, and extends to the cylinder bracket 20 from the cylindrical tubular portion 142 provided on the outer peripheral side of the body member 30 of the cylinder 11 and the side opposite to the cover 21 of the tubular portion 142. And a lid portion 143 to be used. An annular concave portion 144 that is recessed radially inward from the inner peripheral surface is formed at the end of the cylindrical portion 142 on the lid portion 143 side. The lid portion 143 has an insertion hole 145 at the center. The cylindrical portion 142 has an inner diameter that is substantially the same as the outer diameter of the main portion 32 of the cylinder 11, and the insertion hole 145 is formed to be slightly larger than the plate portion 40 of the cylinder bracket 20.

  The cover 141 is attached to the cylinder 11 before and after the cover 21 is attached. At that time, the cylinder bracket 20 is inserted into the insertion hole 145, and the closing member 31 side of the cylinder 11 is fitted to the cylindrical portion 142 of the cover 141. When the annular welded portion 37 is fitted into the concave portion 144, the cylindrical portion 142 of the cover 141 comes into contact with the cylindrical portion 91 of the cover 21 attached back and forth, and in this state, these are joined. Thus, an integral cover structure 146 (scattering suppression member) is formed.

  According to the fifth embodiment, since the cover 21 covers the cylinder opening 12 outside the opening closing member 13, the scattering of the lubricating liquid L leaking from the cylinder opening 12 to the outside is suppressed. become. Further, since the entire cylinder 11 can be covered with the cover structure 146, the entire cylinder 11 can be protected.

“Sixth Embodiment”
Next, a sixth embodiment according to the present invention will be described mainly on the basis of FIG. 7 focusing on differences from the first embodiment. In addition, about the site | part which is common in 1st Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10 </ b> E according to the sixth embodiment includes a cylindrical cover 21 </ b> E that is partially different from the cover 21, and an extendable cover 151. The cover 21E is not provided with the lid portion 92. The cover 21E is made of rubber or resin, and has a cylindrical main body portion 95E and a convex portion 96. The length of the main body portion 95E is short, and the end of the main body portion 95E is opposite to the convex portion 96. An annular stepped portion 152 is formed on the inner peripheral side of the portion.

  The extendable cover 151 is made of rubber or resin, and includes an expandable / contracted cylindrical bellows portion 155 whose one end is fitted to the stepped portion 152, and a lid portion 156 that closes the other end side of the bellows portion 155. Yes. An insertion hole 157 for inserting the plate portion 84 of the rod bracket 23 is formed in the lid portion 156.

  When the cover 21E is attached, the piston rod 17 is in a state in which the rod bracket 23 is already welded to the rod body 22 and the piston rod 17, the piston 16, the seal member 19 and the opening closing member 13 are attached to the cylinder 11. It has become. In this state, the cylinder opening 12 side of the cylinder 11 is fitted to the cover 21E. When the convex portion 96 of the cover 21E is aligned with the position of the annular small diameter portion 33 of the cylinder 11, the convex portion 96 is fitted to the annular small diameter portion 33, and the main portion 95E of the cover 21E is fitted to the main portion 32 of the cylinder 11. Match.

  Next, the plate portion 84 of the rod bracket 23 of the piston rod 17 is inserted into the insertion hole 157, and the end of the telescopic cover 151 opposite to the lid portion 156 of the bellows portion 155 is the stepped portion of the cover 21E. 152 is fitted. At that time, the bellows portion 155 and the stepped portion 152 are bonded with, for example, an adhesive, and the cover 21E and the extendable cover 151 are integrated to form a cover structure 158 (scattering suppression member). Thereby, the cover structure 158 is in a state in which the cylindrical portion 159 including the cover 21E and the bellows portion 155 is provided on the outer peripheral side of the cylinder 11 and extends to the same side as the piston rod 17 rather than the cylinder 11. The portion 156 extends from the extending tip side of the cylindrical portion 159 to the piston rod 17 and comes into contact with the plate portion 83 of the rod bracket 23.

  When the piston rod 17 moves in the direction in which the piston rod 17 protrudes from the cylinder 11, the gas spring 10 </ b> E extends and follows the bellows portion 155, and when the piston rod 17 moves in the direction into the cylinder 11, the bellows portion 155 contracts. Following this, the cover structure 158 covers the entire protruding portion of the rod body 22 of the piston rod 17 regardless of the expansion and contraction of the gas spring 10E.

  According to the sixth embodiment, since the cover structure 158 covers the cylinder opening 12 outside the opening closing member 13, the scattering of the lubricating liquid L leaking from the cylinder opening 12 is suppressed. Will do. Moreover, since the whole protrusion part of the rod main body 22 can be covered with the cover structure 158, the whole rod main body 22 can be protected.

“Seventh Embodiment”
Next, a seventh embodiment according to the present invention will be described mainly based on FIG. 8 with a focus on differences from the sixth embodiment. In addition, about the site | part which is common in 6th Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10F of the seventh embodiment includes a cover 21F that is partially different from the cover 21E, and a cylinder 11F that has a main body 32F that is partially different from the cylinder 11. The cover 21 </ b> F is not formed with the convex portion 96, and has a female screw 161 on the inner peripheral portion. Further, a male thread 162 is formed on the outer peripheral portion of the cylinder 11F closer to the cylinder opening 12 than the annular small diameter portion 33 of the main body portion 32F.

  When the cover 21F is attached, the male screw 162 on the cylinder opening 12 side of the cylinder 11 is screwed into the female screw 161 of the cover 21F. Next, the plate portion 84 of the rod bracket 23 of the piston rod 17 is inserted into the insertion hole 157, and the end portion of the elastic cover 151 opposite to the lid portion 156 of the bellows portion 155 is the stepped portion of the cover 21F. 152 is fitted. At that time, the bellows portion 155 and the stepped portion 152 are bonded with, for example, an adhesive, and the cover 21F and the extendable cover 151 are integrated to form a cover structure 163 (scattering suppression member).

  According to the seventh embodiment, since the cover structure 163 covers the cylinder opening 12 outside the opening closing member 13, the scattering of the lubricating liquid L leaking from the cylinder opening 12 is suppressed. Will do. Moreover, since the whole protrusion part of the rod main body 22 can be covered with the cover structure 163, the whole rod main body 22 can be protected.

“Eighth Embodiment”
Next, an eighth embodiment according to the present invention will be described mainly on the basis of FIG. 9 focusing on the differences from the sixth embodiment. In addition, about the site | part which is common in 6th Embodiment, it represents with the same name and the same code | symbol.

  The gas spring 10G of the eighth embodiment has a cover 21G that is partially different from the cover 21E. The cover 21G has a cylindrical tubular portion 91G and a lid portion 171. The cylindrical portion 91G has a cylindrical main body portion 95G, an annular convex portion 96 is at an intermediate position in the axial direction of the main portion 95G, and an annular concave portion 172 is an axial cover of the main portion 95G. It is provided at the end position on the part 171 side. An annular step portion 152 is formed on the inner peripheral side of the end portion of the main body portion 95G opposite to the convex portion 96. The lid portion 143 has a perforated disk shape with an insertion hole 173 formed in the center. The main body portion 95 </ b> G has an inner diameter that is substantially the same as the outer diameter of the main body portion 32 of the cylinder 11, and the insertion hole 173 is formed to be slightly larger than the plate portion 40 of the cylinder bracket 20.

  A cover 21G is attached to the cylinder 11. At that time, the plate portion 41 of the cylinder bracket 20 is inserted into the insertion hole 173 so that the closing member 31 side of the cylinder 11 is fitted to the cylindrical portion 91G of the cover 21G. At that time, the annular welded portion 37 is fitted into the concave portion 172, and the convex portion 96 is fitted into the annular small diameter portion 33. And the edge part on the opposite side to the cover part 156 of the bellows part 155 of the expansion-contraction cover 151 is fitted to the level | step-difference part 152 of the cover 21G attached to the cylinder 11. FIG. At that time, the bellows portion 155 and the stepped portion 152 are bonded with, for example, an adhesive, and the cover 21G and the extendable cover 151 are integrated to form a cover structure 174 (scattering suppression member).

  According to the seventh embodiment, since the cover structure 174 covers the cylinder opening 12 outside the opening closing member 13, the scattering of the lubricating liquid L leaking from the cylinder opening 12 is suppressed. Will do. In addition, since the entire cylinder 11 and the entire rod body 22 can be covered with the cover structure 174, the entire cylinder 11 and the entire rod body 22 can be protected.

  Here, in the seventh embodiment, the cover 21G may be formed by spraying. That is, a jig serving as a mold of the stepped portion 152 is attached to the cylinder opening 12 side of the cylinder 11, and a material for forming the cover 21 </ b> G is sprayed on the outside of the cylinder 11 in this state. After the material has hardened, the step 152 is formed on the cover 21G by removing the jig. In this case, the spray material is, for example, a resin-containing material.

  In the embodiment described above, one end side is closed and the other end side is opened, an opening closing member provided in the opening of the cylinder, a piston slidably provided in the cylinder, and one end side of the piston A piston rod whose other end extends to the outside through the opening closing member, gas and lubricating liquid sealed in the cylinder, and the opening of the cylinder is covered outside the opening closing member. And a scattering suppressing member that suppresses scattering of the lubricating liquid leaking from the opening to the outside. Since the cover covers the opening of the cylinder outside the opening closing member and prevents the lubricant leaking from the opening of the cylinder from scattering from the cover to the outside, the structure is simplified and the increase in cost can be suppressed. . Therefore, it is possible to suppress the scattering of the leaked lubricating liquid while suppressing an increase in cost.

  Further, the scattering suppression member is provided on the outer peripheral side of the cylinder and extends from the cylinder to the same side as the piston rod, and from the leading end side of the cylindrical portion to the piston rod. And a lid portion extending. Therefore, the structure of scattering suppression by the scattering suppressing member is simplified, and the cost increase can be further suppressed.

  Moreover, since the opening closing member is deformed at a predetermined temperature to open the opening of the cylinder, the opening closing member can be prevented from colliding with the cover.

  In addition, since the opening closing member foams during deformation and holds the lubricating liquid, the lubricating liquid can be prevented from leaking from the scattering suppressing member.

  In addition, since it is provided in the smoke exhaust window, there is a possibility that a fire may occur at the installation location and it may be exposed to a high temperature atmosphere.

DESCRIPTION OF SYMBOLS 1 Smoke exhaust window 10,10A-10G Gas spring 11,11B, 11F Cylinder 12 Cylinder opening 13 Opening closing member 16 Piston 17 Piston rod 21,21A-21C Cover (scattering suppression member)
146, 158, 163, 174 Cover structure 91, 91B, 91C, 91G, 159 Cylindrical part 92, 92A, 92C, 156 Lid G gas L Lubricating liquid

Claims (5)

A cylinder with one end closed and the other end open;
An opening closing member provided at an opening of the cylinder;
A piston slidably provided in the cylinder;
A piston rod having one end connected to the piston and the other end extending to the outside via the opening closing member;
Gas and lubricating liquid sealed in the cylinder;
A scattering suppressing member that covers the opening of the cylinder outside the opening closing member and suppresses scattering of the lubricating liquid leaking from the opening to the outside;
A gas spring characterized by comprising: The scattering suppression member is
A cylindrical portion provided on the outer peripheral side of the cylinder and extending to the same side as the piston rod from the cylinder;
A lid portion extending from the extending tip side of the cylindrical portion to the piston rod;
The gas spring according to claim 1, comprising:   The gas spring according to claim 1 or 2, wherein the opening closing member is deformed at a predetermined temperature to open the opening of the cylinder.   The gas spring according to claim 3, wherein the opening closing member foams and holds the lubricating liquid when deformed.   The gas spring according to any one of claims 1 to 4, wherein the gas spring is provided in a smoke exhaust window.

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