JP5953070B2 - Cylinder device - Google Patents

Description

  The present invention relates to a cylinder device.

  Some cylinder devices are in a locked state in which movement of the rod in the insertion direction into the cylinder is automatically restricted when the rod protrudes from the cylinder to the maximum extent (see, for example, Patent Document 1).

JP-A-50-54775

  The cylinder device described above has a problem that the operability is not good because an operation of pushing the rod against the urging force is necessary as the unlocking operation.

  Therefore, an object of the present invention is to provide a cylinder device capable of improving the operability of the unlocking operation.

In order to achieve the above object, a cylinder device according to the present invention includes a protrusion provided on one of a peripheral surface of the cylinder side member and a peripheral surface of the rod side member and extending in the radial direction, and the protrusion. The maximum length extending in the circumferential direction, which is provided on either the peripheral surface of the cylinder-side member or the peripheral surface of the rod-side member facing the peripheral surface and the protrusion abuts when the rod is in the maximum protruding state A contact portion and a portion provided in the circumferential direction so as to face the maximum length contact portion in the axial direction are in contact with each other when the projection is contracted from the state of contact with the maximum length contact portion. A lock portion that restricts the rod from moving further in the contraction direction, and the protrusion is guided to a predetermined position in the circumferential direction of the maximum length contact portion when the rod is in the maximum protruding state. It comprises a guiding portion, the maximum length A contact portion and a projecting portion provided at a distance from each other in the axial direction, was closed, the predetermined position facing the portion of the locking portion, the maximum length than said protruding portion in the axial direction the contact portion has a structure that is disposed on the opposite side.

  According to the present invention, the operability of the unlocking operation can be improved.

It is the front view which made the section which shows a cylinder device of a 1st embodiment concerning the present invention a section. It is a partial expansion front sectional view showing a cylinder device of a 1st embodiment concerning the present invention. It is an expanded view which shows an example of the overhang | projection part of the cylinder apparatus of 1st Embodiment which concerns on this invention, and the locus | trajectory of a processus | protrusion. It is an expanded view which shows the overhang | projection part of the cylinder apparatus of 2nd Embodiment which concerns on this invention, and an example of the locus | trajectory of a processus | protrusion. It is an expanded view which shows an example of the overhang | projection part and protrusion locus | trajectory of the cylinder apparatus of 3rd Embodiment which concerns on this invention. It is an expanded view which shows an overhang | projection part of the cylinder apparatus of 4th Embodiment which concerns on this invention, and an example of the locus | trajectory of a processus | protrusion. It is a partial expansion front sectional view showing a cylinder device of a 5th embodiment concerning the present invention.

“First Embodiment”
1st Embodiment which concerns on this invention is described based on FIGS. 1-3.

  FIG. 1 shows a cylinder device according to a first embodiment, and this cylinder device is a shock absorber, specifically, a gas stay (gas spring) in which a gas is sealed as a working fluid. The cylinder device includes a cylindrical cylinder 11 in which a gas (air or nitrogen gas) and a small amount of lubricating oil are sealed, a rod 12 having one end inserted into one end of the cylinder 11, and a cylinder of the rod 12 11 and a piston 13 fixed to one end. The piston 13 is slidably fitted in the cylinder 11, and the piston 13 divides the inside of the cylinder 11 into two chambers, a chamber 14 on the rod 12 side and a chamber 15 on the bottom side opposite to the rod 12. ing.

  The cylinder 11 has a cylinder body 22 having a substantially bottomed cylindrical shape having a substantially cylindrical body portion 20 and a bottom portion 21 fixed to the body portion 20 so as to close one end (bottom side) thereof. . In the cylinder body 22, an annular annular step portion 26 having a smaller diameter than the other constant diameter main body portion 25 is formed coaxially by plastic working at the position of the opening portion 23 opposite to the bottom portion 21 of the body portion 20. Has been. The cylinder body 22 is formed with two annular inner projecting portions 27 and 28 coaxially formed by plastic working on the bottom 21 side of the annular stepped portion 26 and having a smaller diameter than the main body portion 25. Further, the cylinder main body 22 is formed with a plurality of locking projections 29 protruding inward in the radial direction at positions between the two inner protrusions 27 and 28. Each of the inner protrusions 27 and 28 may be a plurality of protrusions in the circumferential direction, like the locking protrusion 29.

  The cylinder 11 has a screw member 31 fixed to the bottom portion 21 of the cylinder body 22 so as to protrude outward along the axial direction, and a mounting bracket 32 is rotatably attached to the screw member 31. The mounting bracket 32 includes a mounting plate portion 34 in which a mounting hole 33 is formed, and a holding plate portion 35 that rises vertically from one end portion of the mounting plate portion 34, and the holding plate portion 35 has a screw member 31. An insertion hole 36 is formed for inserting the. The bearing 38, the holding plate portion 35 of the mounting bracket 32 and the bearing 39 are arranged in this order from the bottom 21 side of the cylinder body 22 so as to allow the screw member 31 to be inserted, and these are sandwiched between the bottom portion 21. The nut 40 is screwed to the screw member 31. The mounting bracket 32 is attached to the cylinder 11 in a state where the mounting plate portion 34 is disposed on the side opposite to the bottom portion 21 of the holding plate portion 35. The bearings 38 and 39 are illustrated as ball bearings, but the mounting bracket 32 may be rotatable with respect to the cylinder body 22 and may be a sliding bearing such as a resin.

  The cylinder 11 has a rod guide 45, a seal ring 46, and a holding ring 47 that are disposed inside the opening 23 side of the cylinder body 22, and the rod 12 is inserted into the cylinder 11 through these. ing.

  As shown in FIG. 2, the rod guide 45 has an annular shape in which an insertion hole 50 along the axial direction is formed at the center. The insertion hole 50 is a sliding bearing. On the outer diameter side of the rod guide 45, a large diameter portion 51 having the largest diameter is formed at one end in the axial direction, an intermediate diameter portion 52 having a smaller diameter than the large diameter portion 51 is formed in the middle in the axial direction, It has a stepped cylindrical shape in which a small diameter portion 53 having a smaller diameter than the intermediate diameter portion 52 is formed at the end.

  The seal ring 46 has an annular shape in which an insertion hole 55 is formed in the center along the axial direction. The seal ring 46 includes a substantially cylindrical rigid member 56 and a rubber elastic member 57 formed in an annular shape so as to cover the rigid member 56. The elastic member 57 has a C-shaped radial cross section in which an annular groove 58 is formed on one end side in the axial direction. A rigid member 56 is embedded on the outer diameter side of the groove portion 58 of the elastic member 57.

  The holding ring 47 has an annular shape in which an insertion hole 60 along the axial direction is formed at the center. The holding ring 47 is disposed in the main body portion 25 of the cylinder body 22 so as to abut on the inner protrusion 27 on the opening 23 side from the opening 23 side, and the seal ring 46 is disposed on the opening 23 side of the holding ring 47. Is disposed with the groove 58 facing the holding ring 47. The rod guide 45 is disposed on the side of the opening 23 of the seal ring 46 with the large-diameter portion 51 as the seal ring 46 side. The large-diameter portion 51 of the rod guide 45 is locked to the annular step portion 26 of the cylinder body 22 from the side opposite to the axial seal ring 46, whereby the rod guide 45, the seal ring 46, and the holding ring. 47 is attached to the cylinder body 22 while being sandwiched between the inner projecting portion 27 and the annular step portion 26. If the seal ring 46 can be held on the rod protruding end side by the internal pressure, the holding ring 47 is unnecessary.

  The piston 13 has an annular shape in which a fitting hole 62 along the axial direction is formed in the center, and an arrangement recess 63 that is recessed in the axial direction so as to surround the fitting hole 62 is formed on one end side in the axial direction. Has been. In addition, a plurality of flow path holes 64 are formed in parallel with the fitting holes 62 at the bottom surface position of the arrangement recess 63.

  The rod 12 includes a main shaft portion 68 having a constant diameter, a fitting shaft portion 69 having a smaller diameter than the main shaft portion 68 provided on one end side of the main shaft portion 68, and the opposite side of the main shaft portion 68 of the fitting shaft portion 69. And a crimping portion 70 formed to have a large diameter by plastically deforming the fitting shaft portion 69. The fitting shaft portion 69 of the rod 12 is fitted into the fitting hole 62 of the piston 13 from the side opposite to the placement concave portion 63, and the portion protruding from the piston 13 of the fitting shaft portion 69 in this state is the placement concave portion. A caulking portion 70 is formed by caulking so as to fit within 63. The piston 13 is sandwiched between the caulking portion 70 and the main shaft portion 68. In this way, the piston 13 is attached to one end of the rod 12.

  Here, the rod 12 is inserted through the rod guide 45, the seal ring 46, and the holding ring 47 of the cylinder 11 at the main shaft portion 68, and the seal ring 46 is the main body of the main shaft portion 68 of the rod 12 and the cylinder body 22. The gap with the part 25 is sealed. The piston 13 is fitted in the main body portion 25 on the back side of the cylinder body 22 so as to be relatively rotatable and axially movable with respect to the inner side projecting portion 28 on the back side. Relative rotation and axial movement are possible. In addition, it is desirable to resin-process the outer peripheral surface of piston 13, and you may provide a seal | sticker further. Since the rod 12 protrudes from the cylinder 11, a difference occurs in the pressure receiving area of the rod 12 and the piston 13 in the cylinder 11, so that the piston 13 and the rod 12 are urged in the protruding direction by the gas reaction force.

  As shown in FIG. 1, a mounting bracket 73 is fixed to the other end portion of the main shaft portion 68 of the rod 12 protruding from the cylinder 11. The mounting bracket 73 includes a mounting plate portion 75 in which a mounting hole 74 is formed, and a holding plate portion 76 that rises vertically from one end portion of the mounting plate portion 75. An insertion hole 77 through which the main shaft portion 68 is inserted is formed. The mounting bracket 73 is fixed to the rod 12 by welding in a state where the mounting plate portion 75 is disposed on the side opposite to the rod 12 of the holding plate portion 76.

  As shown in FIG. 2, in the first embodiment, a substantially cylindrical metal cylinder side member 79 is fitted and fixed in the cylinder body 22. The cylinder side member 79 is fitted to the main body 25 of the cylinder body 22 in a state of being sandwiched between the inner projecting portions 27 and 28 on both sides of the cylinder body 22. It is restricted so that it cannot move in the direction. The cylinder-side member 79 is formed with a plurality of locking recesses 80 that are recessed in the radial direction at a central position in the axial direction of the outer peripheral surface. The rotation with respect to the cylinder main body 22 is restricted by the locking protrusions 29 entering each other.

  On the inner peripheral surface of the cylinder side member 79 which is one of the peripheral surface of the cylinder side member 79 and the peripheral surface of the rod 12, a protrusion 81 extending in the radial direction of the cylinder 11 from the same axial position of the inner peripheral surface. Are provided at a plurality of positions, specifically at two positions, at 180 degrees different from each other in the circumferential direction of the inner peripheral surface. These protrusions 81 have a columnar shape along the radial direction of the cylinder body 22 and are disposed between the piston 13 and the holding ring 47. These protrusions 81 form two coaxial fitting holes 82 in the radial direction in the cylinder side member 79, and a cylindrical pin 83 is partially inward from the cylinder side member 79 in these fitting holes 82. By inserting so that it protrudes, it forms by the part which the pin 83 protrudes. The cylinder side member 79 constitutes the cylinder side member of the present invention. The pin 83 is loosely fitted in the fitting hole 82 so as to be rotatable.

  The outer surface of the rod 12, which is the other of the peripheral surface of the cylinder side member 79 and the peripheral surface of the rod 12, facing the peripheral surface provided with the protrusion 81, protrudes along the radial direction of the rod 12. As shown in FIG. 3, there are two types of overhangs 85, 86, 87, 88, 89, and two sets, which are 180 degrees out of phase in the rod circumferential direction (left-right direction in FIG. 3). Are similarly formed. These two sets of overhanging portions 85 to 89 are in contact with the outer peripheral surface of the protrusion 81 to guide it. These two sets of overhang portions 85 to 89 are formed by cutting when the rod 12 is cut, for example, and are integrated with the rod 12. In this embodiment, the rod 12 itself constitutes the rod side member of the present invention. The rod 12 is rotatable relative to the cylinder side member 79 fixed to the cylinder 11, and is thus also rotatable relative to the cylinder 11.

  One set of the overhang portions 85 to 89 will be described. In the following, unless there is a description of another set, the same set is shown. As shown in FIG. 2, the overhanging portion 85 is disposed on the insertion side of the rod 12 into the cylinder 11, that is, on the contraction side in the rod axis direction, among the overhanging portions 85 to 89. In other words, the overhang portion 85 is disposed on the bottom side of the opening portion 23 of the cylinder 11.

  As shown in FIG. 3, the overhanging portion 85 extends in the rod circumferential direction (left-right direction in FIG. 3) and is orthogonal to the rod axis direction (up-down direction in FIG. 3) (in other words, a fixed position in the rod axis direction). A flat surface 91a, a release position concave surface 92a composed of a curved surface recessed to the contraction side (the lower side in FIG. 3) in the rod axial direction at one end position in the rod circumferential direction of the flat surface 91a, and the flat surface 91a And a lock position concave surface 93a made of a curved surface that is recessed shallower than the release position concave surface 92a. The opposite side of the release position concave surface 92a to the flat surface 91a is connected to another set of flat surfaces 91a, and the opposite side of the flat surface 91a to the release position concave surface 92a is also connected to another set of release position concave surfaces 92a. Here, the release position concave surface 92a and the lock position concave surface 93a have an arc shape larger in diameter than the diameter of the protrusion 81, and are 90 degrees out of phase in the rod circumferential direction.

  As shown in FIG. 2, the overhang portions 86 and 87 are arranged on the protruding side of the rod 12 from the cylinder 11 relative to the overhang portion 85, that is, on the extending side in the rod axis direction. In other words, the overhang portions 86 and 87 are disposed closer to the opening 23 of the cylinder 11 than the overhang portion 85. As illustrated in FIG. 3, the overhang portions 86 and 87 have a symmetrical shape with the lock position concave surface 93 a as the center in the rod circumferential direction.

  The overhanging portion 86 has a substantially triangular shape, and the contraction side in the rod axis direction (the lower side in FIG. 3) is a concave surface 95a made of a curved surface that is recessed toward the extension side in the rod axis direction. Further, the extending side in the rod axis direction is an inclined surface 96a which is inclined so that the lock position concave surface 93a side in the rod circumferential direction is positioned closer to the contraction side (the projecting portion 85 side) in the rod axis direction. A surface 97a connecting the opposite sides of the concave surface 95a and the inclined surface 96a opposite to the lock position concave surface 93a in the rod circumferential direction is along the rod axis direction, and the flat surface 91a side of the release position concave surface 92a is disposed on the extension of the surface 97a. Has been. In the rod circumferential direction, the surface 97a of the overhanging portion 86 is disposed in the inner range of the release position concave surface 92a, and the end opposite to the surface 97a of the overhanging portion 86 is disposed in the outer range of the locking position concave surface 93a. Has been. The concave surface 95a has a larger diameter than the diameter of the protrusion 81, and the width of the concave surface 95a in the circumferential direction of the rod is wider than the diameter of the protrusion 81.

  The overhanging portion 87 has a substantially triangular shape, and the contraction side (the lower side in FIG. 3) in the rod axis direction is a concave surface 100a made of a curved surface that is recessed toward the extension side in the rod axis direction. In addition, the extending side in the rod axis direction is an inclined surface 101a that is inclined so that the locking position concave surface 93a side in the rod circumferential direction is positioned closer to the contraction side (the projecting portion 85 side) in the rod axis direction. The surface 102a connecting the opposite sides of the concave surface 100a and the inclined surface 101a opposite to the lock position concave surface 93a in the rod circumferential direction is along the rod axis direction, and the release position concave surface 92a of the flat surface 91a is an extension of the surface 102a. The opposite end side (that is, the end side opposite to the flat surface 91a of this set of the release position concave surface 92a of another set) is arranged. In the circumferential direction of the rod, the surface 102a of the overhang portion 87 is disposed in the inner range of another set of the release position concave surface 92a, and the end opposite to the surface 102a of the overhang portion 87 is outside the lock position concave surface 93a. Arranged in the range. The concave surface 100 a has a diameter larger than the diameter of the protrusion 81, and the width of the concave surface 100 a in the rod circumferential direction is wider than the diameter of the protrusion 81.

  The overhanging portion 88 is disposed on the extending side in the rod axis direction from the overhanging portions 86 and 87 (the side opposite to the overhanging portion 85), and is aligned with the lock position concave surface 93a in the rod circumferential direction. . The overhanging portion 88 has a substantially equilateral triangular shape, and the contraction side in the rod axis direction is a concave surface 105a made of a curved surface that is concave on the extension side in the rod axis direction. In addition, a pair of inclined surfaces 106a and 107a are inclined such that the extending side in the rod axial direction is positioned closer to the extending side in the rod axial direction toward the inner side in the rod circumferential direction. The inclined surfaces 106a and 107a have the same angle with respect to the rod axis direction, and the height in the rod axis direction is also equal. Therefore, the inclined surfaces 106a and 107a have an axisymmetric shape with respect to a line along the rod axis direction passing through the corner portion between them. This corner portion is aligned with the center of the lock position concave surface 93a of the overhang portion 85 in the rod circumferential direction.

  In the circumferential direction of the rod, the end portion of the overhang portion 88 on the overhang portion 86 side is arranged on the overhang portion 87 side in the inner range of the overhang portion 86, and the overhang portion 88 side of the overhang portion 88 is The end portion is disposed on the overhanging portion 86 side in the inner range of the overhanging portion 87. The overhanging portion 88 has the center in the rod circumferential direction aligned with the center of the lock position concave surface 93a, and overlaps the entire range of the lock position concave surface 93a in the rod circumferential direction. The concave surface 105 a has a larger diameter than the diameter of the protrusion 81, and the width of the concave surface 105 a in the rod circumferential direction is wider than the diameter of the protrusion 81. Further, the concave surface 105a is longer in the rod circumferential direction than the rod circumferential direction length of the lock position concave surface 93a, and the protrusion 81 fitted to the lock position concave surface 93a is aligned with the position in the rod circumferential direction. Opposite the rod axis direction.

  The overhanging portion 89 is slightly shifted from the overhanging portion 88 on the extending side in the rod axis direction (on the opposite side to the overhanging portion 85), and is aligned with the release position concave surface 92a in the rod circumferential direction. Yes. The overhang portion 89 has a substantially parallelogram shape, and is an inclined surface 110a that is inclined so that the contraction side in the rod axis direction is positioned closer to the extension side in the rod axis direction toward the overhang portion 86 side in the rod circumferential direction. ing. Further, an inclined surface 111a is inclined such that the extending side in the rod axis direction is positioned closer to the extending side in the rod axis direction toward the protruding portion 86 side in the rod circumferential direction. A surface 112a connecting the inclined surface 110a and the protruding portion 86 side of the inclined surface 111a in the circumferential direction of the rod is along the rod axis direction, and the surface 97a of the protruding portion 86 and the release position concave surface 92a are formed on the extension of the surface 112a. The overhanging portion 86 side is arranged. A surface 113a connecting ends of the inclined surface 110a and the inclined surface 111a opposite to the protruding portion 86 in the rod circumferential direction is along the rod axis direction, and another set of protruding portions is formed on the extension of the surface 113a. The end side opposite to the overhanging portion 86 of the surface 102a of the 87 and the release position concave surface 92a is disposed. The overhanging portion 89 has the center in the rod circumferential direction aligned with the center of the release position concave surface 92a, and is 90 degrees out of phase in the rod circumferential direction with respect to the center of the overhanging portion 88.

  Gas reaction force is applied to the piston 13 and the rod 12 shown in FIG. 2, and the piston 13 moves so as to reduce the chamber 14 while expanding the chamber 15 by the gas reaction force. Then, the rod 12 moves to the extending side protruding from the cylinder 11. When the rod 12 approaches the maximum projecting state in which the rod 12 projects most from the cylinder 11 during this movement, the rod 12 protrudes from the protrusion 81 of the cylinder side member 79 fixed to the cylinder 11 as shown in FIG. To 89 abut on the inclined surface 106a, the inclined surface 107a or the inclined surface 111a of the protruding portion 89 on the extending side (upper side in FIG. 3), or directly on the contraction side (in FIG. 3). It contacts with the inclined surface 96a of the overhanging portion 86 or the inclined surface 101a of the overhanging portion 87 on the lower side.

  When the inclined surface 106a, the inclined surface 107a of the overhanging portion 88 or the inclined surface 111a of the overhanging portion 89 abuts the protrusion 81, the protrusion 81, that is, the cylinder 11 is relatively rotated with any of these inclinations. Then, when the projection 81 abuts on the inclined surface 106a of the overhanging portion 88, the abutting surface 96a of the overhanging portion 86 then contacts with the inclined surface 107a of the overhanging portion 88. Next, in contact with the inclined surface 101 a of the overhang portion 87, and in contact with the inclined surface 111 a of the overhang portion 89, the contact is then made with the inclined surface 101 a of another overhang portion 87.

  Then, when the projection 81 comes into contact with the inclined surface 96a of the overhanging portion 86 or the inclined surface 101a of the overhanging portion 87, the cylinder 11 is relatively rotated with any of these inclinations, and then the overhanging portion 85 is locked. It contacts at the position concave surface 93a. As a result, the rod 12 is in the maximum projecting state in which it projects most from the cylinder 11. For example, as shown in FIG. 3, the rod 12 abuts against the protrusion 81 that is relatively close to the position indicated by A1, as shown in A2. After the cylinder 11 is relatively rotated, it contacts with the inclined surface 96a of the protruding portion 86 as shown in A3, and the protrusion 81, that is, the cylinder 11 is relatively rotated with the inclination, and then the protruding portion 85 as shown in A4. The locking position concave surface 93a makes contact. Here, the protrusion 81 is configured by loosely fitting the pin 83 to the fitting hole 82 as shown in FIG. 2, so that the inclined surfaces 96a, 101a, 106a, 107a, 111a shown in FIG. The frictional resistance is reduced by rotating in any of the relative movements.

  In the above-described maximum projecting state, the overhanging portion 85 is pressed against the projection 81 by the gas reaction force applied to the rod 12 via the piston 13 shown in FIG. 2, and the lock position concave surface 93a shown in FIG. The state of contact is maintained. From the above, at least the inclined surface 96a of the overhanging portion 86 or the inclined surface 101a of the overhanging portion 87 has the protrusion 81 in the lock position concave surface 93a located on the back side of the overhanging portion 88 in the position in the rod circumferential direction. In this case, the cylinder 11 is rotated relative to the rod 12 at each inclination.

  When the protrusion 81 abuts against the bottom of the lock position concave surface 93a, the cylinder 11 is positioned at a predetermined first relative rotational position with respect to the rod 12. That is, at least the inclined surface 96a of the overhanging portion 86 or the inclined surface 101a of the overhanging portion 87 is provided on the outer peripheral surface of the rod 12, and the rod 11 comes into contact with the protrusion 81 when the rod 12 reaches the maximum protruding state. Is relatively rotated with respect to the rod 12 and guided to a predetermined first relative rotational position.

  The state at the first relative rotational position is a locked state, and when the rod 12 is inserted into the cylinder 11 to move the rod 12 to the contraction side (lower side in FIG. 3) from this state, the position is within the lock position concave surface 93a. After the overhanging portion 85 is separated in the rod axial direction from the protruding projection 81, the concave surface 105a of the overhanging portion 88 facing the lock position concave surface 93a in the rod axial direction comes into contact with and is retained. The movement of the rod 12 in the contraction direction with respect to the cylinder 11 is restricted. In this case, even if the cylinder 11 is slightly rotated relative to the rod 12, the concave surface 95a of the overhanging portion 86 or the concave surface 100a of the overhanging portion 87 shown in FIG. Further, the movement of the rod 12 in the contraction direction is restricted.

  As a result, when the rod 12 reaches the maximum projecting state in which the rod 12 protrudes most from the cylinder 11 shown in FIG. 2 due to the extending stroke, the cylinder device automatically enters a locked state in which the contracting stroke is regulated. That is, the overhang portions 86, 87, and 88 shown in FIG. 3 provided on the outer peripheral surface of the rod 12 are in the first relative rotational position of the cylinder 11 and the rod 12 when the rod 12 is in the maximum protruding state. Sometimes, when the rod 12 moves in the insertion direction by facing the projection 81 in the axial direction, the rod 12 comes into contact with the projection 81 to be in a locked state. Here, the concave surfaces 95a, 100a, and 105a of the overhang portions 86, 87, and 88 restrict the rod 12 from contracting beyond the center of the protrusion 81 if the center of the protrusion 81 is within the respective ranges in the rod circumferential direction. In this case, the protrusion 81 is guided to the center position in the rod circumferential direction, which is the deepest position of each.

  When the cylinder 11 is rotated relative to the rod 12 from the locked state at the first relative rotational position to a predetermined second relative rotational position different from the first relative rotational position, the cylinder 11 is integrated with the cylinder 11. The protrusion 81 also rotates (revolves) relative to the rod 12. By this rotational movement of the protrusion 81, the rod 12 is slightly moved to the contraction side in the rod axis direction against the gas reaction force at the initial stage, and the protrusion 81 is laid on the flat surface 91a from the lock position concave surface 93a. After the projection 81 is moved on the surface 91a, the projection 81 is moved into the release position concave surface 92a by moving to the extending side in the rod axis direction by the gas reaction force at the position of the release position concave surface 92a at the final stage. In this state, the release position concave surface 92a comes into contact with the protrusion 81 by the gas reaction force, and the movement in the rod circumferential direction is restricted. That is, the release position concave surface 92a is provided on the outer peripheral surface of the rod 12, and when the cylinder 11 is positioned at the predetermined second relative rotational position with respect to the rod 12, the gas is released by facing the protrusion 81 in the rod axial direction. The reaction force abuts against the protrusion 81 to restrict relative movement of the cylinder 11 in the rotational direction with respect to the rod 12. For example, as shown in FIG. 3, with respect to the protrusion 81 at the position shown in A4, the rod 12 causes the protrusion 81 to ride on the flat surface 91a as shown in A5 from the lock position concave surface 93a, and on the flat surface 91a. Then, the projection 81 is caused to enter the release position concave surface 92a as shown in A6. Also at this time, the protrusion 81 rotates to reduce the frictional resistance at the time of relative movement along the lock position concave surface 93a, the flat surface 91a, and the release position concave surface 92a.

  The state of the second relative rotation position is an unlocked state. When the rod 12 is inserted into the cylinder 11 to move the rod 12 to the contraction side (lower side in FIG. 3) from this state, the rod 12 After allowing the projection 81 to pass between the surfaces 97a and 102a of the overhanging portion 86 and the overhanging portion 87 of another set, the inclining surface 110a of the overhanging portion 89 abuts against the protrusion 81, and the protrusion 81 is inclined by the inclination. After the cylinder 11 is relatively rotated so as to be close to the overhanging portion 88, a further movement in the contraction direction is allowed. For example, as shown in FIG. 3, the rod 12 passes through the protrusion 81 between the overhanging portion 86 and another overhanging portion 87 as shown in A7 with respect to the protrusion 81 at the position shown in A6. After making contact with the projection 81 at the inclined surface 110a of the overhanging portion 89, and relatively rotating with the cylinder 11 so that the projection 81 is close to the overhanging portion 88 with the inclination as shown in A8, As shown in A9, a further movement in the shrinking direction is allowed. When the inclined surface 110a is relatively moved, the frictional resistance is reduced by the rotation of the protrusion 81.

  As described above, when the rod 12 reaches the maximum protruding state in which the rod 12 protrudes most from the cylinder 11, the protruding edge 81 includes the flat surface 91 a, the release position concave surface 92 a, and the lock position concave surface 93 a. The maximum length contact part 115 which contacts is comprised. That is, the maximum length contact portion 115 includes a flat portion 91 having a flat surface 91a along the orthogonal direction of the rod axis, a release position recess (recess) 92 having a release position concave surface 92a recessed from the flat surface 91a, and the flat surface 91a. The lock position concave portion 93 has a concave lock position concave surface 93a.

  Further, the end edge portion including the concave surface 105a of the overhang portion 88 is partially provided in the circumferential direction so as to face the maximum length contact portion 115 in the axial direction, and the protrusion 81 contacts when the cylinder device is contracted. The lock portion 105 that restricts the rod 12 from moving further in the contracting direction is configured, and the end edge portion including the concave surface 95a of the overhang portion 86 also has the same lock portion 95 and the concave surface 100a of the overhang portion 87. The included edge portion also constitutes the same lock portion 100. The lock portions 95, 100, 105 are formed with concave surfaces 95 a, 100 a, 105 a facing the maximum length contact portion 115. The lock portions 95, 100, and 105 are all wider in the rod circumferential direction than the diameter of the protrusion 81.

  The maximum length abutting portion 115 is configured so that the rod 12 is located when the positions of the flat surface 91a and the lock position concave surface 93a, which are circumferential ranges facing the lock portions 95, 100, 105, are within this range. When the position of the release position concave surface 92a, which is a range in the circumferential direction that does not face the lock portions 95, 100, and 105, is located in the range where the protrusion 81 is located in the lockable position where the movement in the contraction direction is impossible. The lock release position is such that the rod 12 can move in the contraction direction. Therefore, the lockable position of the maximum length contact portion 115 is composed of the flat portion 91 having the flat surface 91a along the direction orthogonal to the rod axis and the lock position recess portion 93 having the lock position concave surface 93a. 115 is provided with a release position recess 92 having a release position concave surface 92a into which the protrusion 81 is fitted.

  In addition, the end edge portion including the inclined surface 106a of the overhanging portion 88 causes the protrusion 81 to protrude from the lock portion 105 of the overhanging portion 88 in the circumferential direction of the maximum length abutting portion 115 when the rod 12 reaches the maximum protruding state. The guide portion 106 is provided so as to be separated from the maximum length contact portion 115 in the axial direction so as to be guided to the position facing the concave surface 105a, and the end edge portion including the inclined surface 107a of the overhang portion 88 is also the same. The guiding part 107 has the same guiding part 111 at the end edge including the inclined surface 111a of the overhanging part 89, and the same guiding part 112 at the end edge including the surface 112a of the overhanging part 89. The edge portion including the inclined surface 96a also forms the same guiding portion 96, and the edge portion including the inclined surface 101a of the overhanging portion 87 also forms the similar guiding portion 101. When the rod 12 is extended to the maximum length, the guide portions 96, 101, 106, 107, 111 automatically rotate the relative rotational position of the cylinder 11 and the rod 12 to the locked position.

  The lock part 95 and the guide part 96 are formed on one side and the other side of the projecting part 86 that are provided apart from the maximum length contact part 115 in the axial direction. Are formed on one side and the other side of the same overhang portion 87, respectively, and the lock portion 105 and the guide portions 106 and 107 are formed on one side and the other side of the same overhang portion 88, respectively.

  The protrusion 81 and the overhanging portions 85 to 89 automatically lock the rod 12 to the cylinder 11 to the maximum length so that the rod 12 cannot be contracted, and can be contracted when the cylinder 11 is manually rotated relative to the rod 12. The cam mechanism 120 for releasing the lock is configured, and the cam mechanism 120 is provided in the cylinder 11 at a position between the cylinder 11 and the rod 12.

  As shown in FIG. 1, on the bottom 21 side of the body portion 20 of the cylinder 11 and the mounting plate portion 34 of the mounting bracket 32, as described above, the protrusions 81 are rod-connected to the lock position concave portion 93 of the overhanging portion 85. The fact that the positions in the circumferential direction match, that is, that the rod 12 and the cylinder 11 are located at a predetermined first relative rotational position, in other words, that the relative rotational position between the rod 12 and the cylinder 11 is in the locked position, Is provided with a position confirmation unit 121 that can be confirmed. The position confirmation unit 121 includes a triangular mark 122 formed on the body 20 of the cylinder 11 so as to be directed to the mounting plate 34 along the cylinder axis direction, and a rod shaft on the mounting plate 34 of the mounting bracket 32. It consists of a triangular mark 123 formed so as to be directed to the body portion 20 along the direction.

  When these marks 122 and 123 are aligned in the cylinder circumferential direction and are opposed to each other in the cylinder axial direction, the protrusion 81 is aligned with the lock position recess 93 of the overhanging portion 85 in the rod circumferential direction. That is, the rod 12 and the cylinder 11 are in a state of being located at a predetermined first relative rotational position, in other words, the relative rotational position of the rod 12 and the cylinder 11 is in a locked position. On the other hand, when these marks 122 and 123 shift the position in the rod circumferential direction by a predetermined 90 degrees, the protrusion 81 is in a state where the position in the rod circumferential direction is aligned with the release position recess 92 of the overhanging portion 85, that is, the rod 12 and the cylinder 11. Are positioned at a predetermined second relative rotational position, in other words, the relative rotational position between the rod 12 and the cylinder 11 is at the unlocked position. The mark 122 formed on the cylinder 11 is provided with a letter “LOCK” indicating that the relative rotational position of the cylinder 11 and the rod 12 is in the locked position.

At the time of mounting on the mounting target, the operator attaches the mounting bracket 73 to one of the mounting targets, loosens the nut 40, and adjusts the angle of the mounting bracket 32 according to the other mounting target. It will be attached to the other side. Therefore, the rotation angle of the mounting bracket 32 with respect to the cylinder 11 is determined at this point. For this reason, the mark 122 of the cylinder 11 is aligned with the mark 123 of the mounting bracket 32 in a state where the mounting bracket 73 and the mounting bracket 32 are attached to the mounting target and the rod 40 is in the maximum protruding state while the nut 40 is loosened. It is good to add later. Therefore, the mark 122 of the cylinder 11 is a seal label that can be retrofitted. On the other hand, the mark 123 of the mounting bracket 32 is formed by engraving.
In addition, although the example which described only the character of "LOCK" was shown in FIG. 1, you may make it describe the character of "UNLOCK" which displays the unlocking position where the processus | protrusion 81 is located in an unlocking position, Both may be described.

  Next, the operation of the first embodiment described above will be described.

  The cylinder device is a fastening member in which an attachment plate portion 34 of the attachment bracket 32 attached to the cylinder 11 and an attachment plate portion 75 of the attachment bracket 73 attached to the rod 12 are inserted into the attachment holes 33 and 74, respectively. For example, it is attached to a base member (not shown) and an opening / closing member (not shown) that swings relative to the base member. In the case where the opening / closing member is always closed, it is desirable that the mounting direction is such that the protruding side (upper side in the figure) of the rod 12 of the cylinder device is on the lower side when the opening / closing member is closed. This is because it is preferable to ensure that the oil in the cylinder is in contact with the seal ring 46 as much as possible in order to ensure sealing performance and sliding performance.

  When the opening / closing member is in the closed state close to the base member, the rod 12 is inserted most into the cylinder 11, and when the opening / closing member is in the open state farthest from the base member, the rod 12 is inserted into the cylinder 11. Will be the most prominent. Here, since the chambers 14 and 15 are filled with high-pressure gas, a gas reaction force, which is an urging force in a direction in which the rod 12 protrudes from the cylinder 11, is generated in the piston 13 due to the pressure receiving area difference. Yes. Therefore, in the closed state, the weight of the opening / closing member is maintained in the closed state over the gas reaction force, or is maintained in the closed state with respect to the base member by a lock mechanism (not shown).

  When the opening / closing member swings, the piston 13 moves in the cylinder axial direction in the cylinder 11 to change the volume of the chambers 14 and 15. At this time, the flow of the piston 13 connecting these chambers 14 and 15 is changed. The passage hole 64 controls the flow of oil and generates a damping force to suppress the swing speed of the opening / closing member. Oil and gas are sealed in the cylinder 11, and the amount of oil is sealed such that the oil flows into the flow hole 64 from a position where the rod 12 approaches the maximum protruding state.

  Here, when the operator swings the opening / closing member in the opening direction, the rod 12 moves to the side protruding from the cylinder 11 by the gas reaction force. Then, the protrusion 81 moves relatively to the protruding portions 85 to 89 side in the rod axis direction. At that time, when the relative position in the rod circumferential direction is shifted with respect to both the projecting portion 88 and the projecting portion 89, the protrusion 81 is placed on any one of the guide portions 96 and 101 of the projecting portions 86 and 87. The rod 12 and the cylinder 11 are directly abutted, and the rod 12 and the cylinder 11 are rotated relative to each other, and are further moved relative to the protruding portion 85 side in the rod axis direction to abut against the bottom of the lock position recess 93 by the gas reaction force and stop. It will be. In this state, the rod 12 is in the maximum projecting state in which it projects most from the cylinder 11, and the rod 12 and the cylinder 11 are located at the first relative rotational position.

  On the other hand, when the position of the protrusion 81 in the circumferential direction of the rod is aligned with the overhanging portion 88, the protrusion 81 abuts one of the guide portions 106 and 107, and the rod 12 and the cylinder 11 are relatively rotated by the guide, Move relatively to the rod axial direction overhanging portions 86 and 87, move away from the overhanging portion 88 in the rod circumferential direction, and relatively move toward the rod axial direction overhanging portion 86 or the overhanging portion 87 side. Then, it abuts on any one of the guide portions 96 and 101 of the overhang portions 86 and 87, and thereafter, in the same manner as described above, the rod 12 and the cylinder 11 are relatively rotated by the guide, and further in the rod axial direction. Relative movement to the overhanging portion 85 side comes into contact with the bottom of the lock position recess 93 and stops.

  Further, when the position of the protrusion 81 in the rod circumferential direction is aligned with the overhanging portion 89, the protrusion 81 abuts either one of the guide portions 111 and 112, and the rod 12 and the cylinder 11 are relatively rotated by the guide, The rod moves relatively toward the rod axial direction overhanging portion 86 or another set of overhanging portions 87 and moves away from the overhanging portion 89 in the rod circumferential direction. It moves to the overhanging portion 87 side of the set and comes into contact with any one of the guide portions 96, 101 of these overhanging portions 86, 87, and thereafter, the rod 12 and the cylinder 11 are guided by the guide in the same manner as described above. While relatively rotating, it further moves relative to the protruding portion 85 side in the rod axis direction and comes into contact with the bottom of the lock position recess 93 or another set of lock position recesses 93 to stop.

  That is, in any case, the protrusion 81 aligns the position in the rod circumferential direction with the lock position recess 93 that is recessed to the one side in the rod axial direction. As described above, when the projection 81 is positioned in the lock position recess 93, the rod 12 is in the maximum projecting state, and the rod 12 and the cylinder 11 are positioned at the first relative rotational position. The marks 122 and 123 of the part 121 match the positions in the rod circumferential direction.

  Next, when the operator rotates the cylinder 11 in any direction by 90 degrees from the state where the projection 81 is positioned in the lock position recess 93, the projection 81 slightly resists the gas reaction force by guiding the lock position recess 93. Then, the rod moves relatively to the opposite side of the protruding portion 85 in the rod axis direction, and then moves in the rod circumferential direction along the flat portion 91. At the position of the release position recess 92, the release position is caused by the gas reaction force. It enters into the recess 92 and comes into contact with the bottom to stop. Thereby, the rod 12 and the cylinder 11 are located in the 2nd relative rotation position which will be in an unlocked state.

  At this time, while the protrusion 81 moves on the flat portion 91, the gas reaction force generates a rotational resistance in the cylinder 11. However, at the position of the release position recess 92, the protrusion 81 is moved to the release position by the gas reaction force. It will naturally enter the recess 92 and come into contact with the bottom thereof, and the rotational resistance will be reduced. Then, when further trying to exit from the release position recess 92, rotational resistance due to the gas reaction force is generated again. Accordingly, when the protrusion 81 is positioned in the release position recess 92, an accent is generated in which the rotational operation force of the cylinder 11 becomes lighter than before and after that, and a so-called click feeling is generated.

  With this click feeling, the operator determines that the unlocked state has been released, and swings the opening / closing member in the closing direction against the gas reaction force. Then, the rod 12 moves to the rod insertion side, and the protrusion 81 relatively moves to the side opposite to the protruding portion 85 in the rod axis direction. At this time, since the position of the protrusion 81 in the circumferential direction of the rod matches the inclined surface 110a of the overhanging portion 89, the protrusion 81 abuts the inclined surface 110a, and the rod 12 and the cylinder 11 are rotated relative to each other by the guide. The protrusion 81 moves relatively to the rod circumferentially extending portion 88 side and moves away from the inclined surface 110a. Thereafter, the protrusion 81 moves to the opposite side of the rod axially extending portion 85 as it is. As a result, the rod 12 moves to the rod insertion side, the opening / closing member is closed, and then the opening / closing member is locked by the lock mechanism as necessary.

  If the operator swings the opening / closing member in the closing direction against the gas reaction force without rotating the cylinder 11 from the state where the projection 81 is located in the lock position recess 93, the rod 12 is inserted into the rod. The protrusion 81 moves relatively to the opposite side of the rod axially extending portion 85, but the protrusion 81 is aligned with the lock portion 105 in the circumferential direction of the rod. Therefore, it comes into contact with the concave surface 105a of the lock portion 105 and stops at the bottom position, and further relative movement to the opposite side of the protruding portion 85 in the rod axis direction is restricted. That is, it becomes a locked state.

  Further, when the cylinder 11 is relatively rotated from the state in which the protrusion 81 is positioned in the lock position recess 93 to the extent that the protrusion 81 is not positioned in the release position recess 92, the opening / closing member is closed against the gas reaction force. , The rod 12 moves to the rod insertion side, and the projection 81 relatively moves to the side opposite to the overhanging portion 85 in the rod axis direction. The position in the rod circumferential direction matches one of the portions 95, 100, abuts on one of the concave surfaces 95a, 100a of the lock portions 95, 100, stops at the bottom, and the rod axial direction beyond that The relative movement to the opposite side of the overhanging portion 85 is restricted. That is, it becomes a locked state.

  For example, when the operator puts a load on the opening / closing member and the mass of the opening / closing member increases, or the gas pressure in the cylinder 11 decreases, the gas reaction force decreases, and the cylinder device When the rod 12 cannot be maintained in the maximum projecting state, that is, when the opening / closing member cannot be maintained in the fully open state, the opening / closing member swings in the closing direction against the gas reaction force, and the protrusion 81 is recessed in the lock position. 93, that is, the cylinder 11 and the rod 12 remain in the first relative rotation position, the rod 12 moves to the rod insertion side, and the protrusion 81 is relatively extended with respect to the rod axially extending portion 85. Will move to the other side. Also in this case, since the protrusion 81 is aligned with the lock portion 105 in the rod circumferential direction, the protrusion 81 abuts against the concave surface 105a of the lock portion 105 and stops at its bottom position, and further protrudes in the rod axial direction. Relative movement to the opposite side of 85 is restricted. Therefore, the locked state in which the movement of the rod 12 toward the rod insertion side is restricted, and the open / close member is maintained in the open state.

  When closing the opening / closing member from this state, the operator rotates the cylinder 11 with the intention of closing the opening / closing member, and moves the protrusion 81 from the concave surface 105a of the lock portion 105 to the outside in the rod circumferential direction. Since the lock portion 105 that restricts the movement of the protrusion 81 on the side opposite to the rod-axis extending portion 85 does not exist, thereafter, the protrusion 81 relatively moves in the rod-axis direction. The rod 12 moves to the insertion side and the opening / closing member is closed, and then the opening / closing member is locked by a lock mechanism if necessary.

  In the cylinder device described in Patent Document 1 described above, when the rod protrudes from the cylinder to the maximum extent, the rod device automatically locks in the insertion direction of the rod into the cylinder. As an operation, it is necessary to push the rod relatively large against a relatively high gas reaction force, and there is a problem that the operability of unlocking is not good.

  On the other hand, according to the first embodiment described above, when the rod 12 is in the maximum projecting state, the guide portions 96 and 101 provided apart from the maximum length contact portion 115 in the axial direction. , 106, 107, 111 lead the protrusion 81 to the lock position recess 93 facing the lock portion 105 in the circumferential direction of the maximum length contact portion 115, so that the lock portion 105 does not move in the contraction direction of the rod 12. Will be regulated. As described above, the guides 96, 101, 106, 107, and 111 that are provided apart from the maximum length contact portion 115 in the axial direction cause the protrusion 81 to be connected to the lock portion 105 in the circumferential direction of the maximum length contact portion 115. Since it is guided to the opposing lock position recess 93, it is not necessary to move the rod 12 and the cylinder 11 relative to each other against the gas reaction force when the lock is released. That is, when the protrusion 81 is guided to the lock position recess 93 by the shape of the maximum length contact portion 115 by the gas reaction force, it is necessary to move the protrusion 81 relatively against the gas reaction force when unlocking. On the other hand, this need is eliminated. Therefore, the rotational torque necessary for the unlocking operation can be reduced, and the operability of the unlocking operation can be improved. In particular, when it is arranged in a narrow space where manual rotation is difficult to perform, the effect of reducing rotational torque is enhanced. That is, for example, when the space is such that only a fingertip can be inserted without a fist being inserted, the cylinder 11 and the rod 12 can be relatively rotated with the force of only the fingertip, and the lock is released. Is possible.

  Moreover, since the operation with the operator's intention of rotating the cylinder 11 and the rod 12 relatively is necessary, it is possible to prevent the lock from being inadvertently released. In addition, since the operation is to manually rotate the cylinder 11 and the rod 12 relative to each other, unlocking is easy. Therefore, usability can be improved. In addition, since the unlocking operation is an operation of rotating the cylinder 11 and the rod 12 relative to each other, it is not necessary to consider the swinging of the releasing member, and it is difficult to be restricted by the installation space.

  More specifically, when the rods 12 are extended to the maximum length, the guide portions 96, 101, 106, 107, and 111 indicate that the relative rotational position of the cylinder 11 and the rod 12 is reduced from the vicinity of the maximum length. Automatically rotate to the lock position to be regulated. Therefore, when the rod 12 is extended to the maximum length, a lock state is automatically set in which the rod 12 is prevented from contracting from the vicinity of the maximum length. Further, if the relative rotation position of the cylinder 11 and the rod 12 is set to the unlocking position that allows manual contraction from the vicinity of the maximum length, the rod 12 can be contracted from the vicinity of the maximum length. Therefore, since the operation of setting the relative rotation position of the cylinder 11 and the rod 12 to the unlock position is necessary, it is possible to prevent the lock from being inadvertently released. Further, since the operation is to set the relative rotation position of the cylinder 11 and the rod 12 to the unlocking position, the unlocking is facilitated. Therefore, usability can be improved. In addition, since the unlocking operation is an operation of setting the relative rotation position of the cylinder 11 and the rod 12 to the unlocking position, it is not necessary to consider the swinging of the releasing member, and the mounting space is not easily restricted.

  Of the maximum length contact portion 115 extending in the circumferential direction, the range of the flat portion 91 in the circumferential direction facing the lock portion 95 and the lock position concave portion 93 is such that the rod is in the contracting direction when the projection 81 is located in this range. Unlockable position in which the rod 12 can move in the contraction direction when the protrusion 81 is located in the range of the circumferential release position recess 92 that does not face the lock portion 95 and is in a lockable position where the movement is impossible. Therefore, when the lock is released, the protrusion 81 that contacts the maximum length contact portion 115 is moved from the lockable position to the unlock position along the maximum length contact portion 115 extending in the circumferential direction by the gas reaction force. You can do it. Therefore, the rotational torque required for the unlocking operation can be reduced, and the operability of the unlocking operation can be further improved.

  In addition, since the lockable position of the maximum length contact portion 115 has the flat portion 91, the protrusion 81 that contacts the maximum length contact portion 115 by the gas reaction force can be locked with the flat portion 91 when the lock is released. What is necessary is just to move to a lock release position from a position. Therefore, the rotational torque required for the unlocking operation can be reduced, and the operability of the unlocking operation can be further improved.

  Further, the protrusion 81 located at the unlock position of the maximum length contact portion 115 is fitted to the release position recess 92 by the gas reaction force, so that the operating force can be accented and located at the unlock position. This can be recognized by the operator. That is, when the cylinder 11 and the rod 12 are different from the predetermined first relative rotational position and become the predetermined second relative rotational position in the unlocked state, the release position recess 92 that defines the unlocking position is the rod When the cylinder 12 moves in the protruding direction, the cylinder 11 and the rod 12 come into a predetermined second relative rotational position where the cylinder 11 and the rod 12 are unlocked. This can be notified to the operator by a change in operation feeling. Therefore, usability can be further improved.

  In addition, the lock portion 95 and the guide portion 96 are formed on one side and the other side of the overhang portion 86 that are provided apart from the maximum length contact portion 115 in the axial direction. 101 is formed on one side and the other side of the same overhang portion 87, and the lock portion 105 and the guide portions 106 and 107 are formed on one side and the other side of the same overhang portion 88, respectively. The number of overhang portions can be reduced, and the weight and cost can be reduced.

  Further, since the lock portions 95, 100, and 105 are each wider than the diameter of the protrusion 81, the rod 12 can be well regulated so as not to move in the contraction direction.

  Further, since the surfaces of the lock portions 95, 100, 105 facing the maximum length contact portion 115 are the concave surfaces 95a, 100a, 105a, the rod 12 can be well regulated so as not to move in the contraction direction.

  Further, if the position confirmation part 121 on the external appearance of the cylinder 11 is viewed, it is possible to confirm that the protrusion 81 is in the lock position facing the lock part 95 in the rod axis direction. The operator can easily and surely recognize that the lock position is opposite to the direction. Therefore, usability and safety can be further improved.

  Further, since the cam mechanism 120 can be built in the cylinder 11, the outer shape is the same as that of a conventional gas spring, and the overall size can be reduced.

  Further, since the protrusion 81 is configured by loosely fitting the pin 83 with respect to the fitting hole 82, the protrusion 81 rotates when the protrusion 81 contacts and moves to the maximum length contact portion 115. (Rotation) can reduce frictional resistance. Therefore, the rotational torque necessary for the unlocking operation can be further reduced, and the operability of the unlocking operation can be further improved.

“Second Embodiment”
Next, a second 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.

  In 2nd Embodiment, the protrusion parts 130 and 131 which protrude rather than the flat part 91 are formed between the flat part 91 which is a lockable position, and the cancellation | release position recessed part 92 which is a lock release position in the rod circumferential direction. . These protrusions 130 and 131 have a semicircular shape with a tapered cross section, and the protrusion 81 gets over when moving from the flat portion 91 to the release position recess 92 in the circumferential direction of the rod along the maximum length contact portion 115. It is possible.

  In the second embodiment, when the rod 12 is moved to the extending side (upper side in FIG. 4) and protruded from the cylinder 11, the rod 12 is guided to the guiding portions 96, 101, 106, 107, 111 as in the first embodiment. The protrusion 81, that is, the cylinder 11 is relatively rotated by any one of the guides, and finally comes into contact with the protrusion 81 at the lock position concave surface 93a of the overhanging portion 85 and is positioned at the first relative rotation position with respect to the cylinder 11. It becomes a locked state (see, for example, A1 to A4).

  When the cylinder 11 is rotated relative to the rod 12 to the predetermined second relative rotation position where the cylinder 11 is unlocked, the protrusion 81 that rotates integrally with the cylinder 11 travels on the flat surface 91a. Then, it overcomes one of the protrusions 130 and 131 against the gas reaction force and enters the release position concave surface 92a. For example, the protrusion 81 travels on the flat surface 91a as shown by A5 in FIG. 4 and then climbs over the protrusion 131 against the gas reaction force as shown by B5 and is released as shown by A6. It enters the position concave surface 92a.

  When the rod 12 is inserted into the cylinder 11 so as to move the rod 12 to the contraction side from this unlocked state, the rod 12 has the surfaces 97a and 102a of the overhanging portion 86 and the separate overhanging portion 87 as in the first embodiment. After the projection 81 is passed between the cylinder 11 and the cylinder 11 is relatively rotated so that the projection 81 comes into contact with the projection 81 at the inclined surface 110a of the overhanging portion 89 and the projection 81 is brought close to the overhanging portion 88 with the inclination. Further movement in the shrinking direction is allowed (see, for example, A6 to A9).

  According to the second embodiment described above, the protrusions 130 and 131 that protrude from the flat portion 91 between the flat portion 91 that is the lockable position and the release position concave portion 92 that is the lock release position are located in the rod circumferential direction. Therefore, the protrusions 130 and 131 and the release position recess 92 restrict the movement of the protrusion 81 in the rod circumferential direction, that is, the relative rotation of the cylinder 11 with respect to the rod 12. Therefore, it is possible to satisfactorily convey to the operator that the cylinder 11 has reached the predetermined second relative rotational position where the unlocked state is achieved with respect to the rod 12 by a change in operational feeling. Therefore, usability can be further improved.

“Third Embodiment”
Next, a third embodiment according to the present invention will be described mainly with reference to 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.

  In the third embodiment, the shape of the maximum length contact portion 115 of the overhang portion 85 is different from that of the first embodiment. The maximum length contact portion 115 of the third embodiment is connected to the opening side of the lock position concave surface 93a similar to that of the first embodiment and the bottom side of the release position concave surface 92a and another set of release position concave surfaces 92a. In place of the flat surface 91a of the embodiment, inclined surfaces 135a and 136a are formed. The inclined surface 135a connects the lock position concave surface 93a and the release position concave surface 92a, the inclined surface 136a connects the lock position concave surface 93a and another set of the release position concave surface 92a, and the lock position concave surface 93a side is the rod. It inclines so that it may be located in the axial extension side (upper side of FIG. 5). Therefore, the maximum length contact portion 115 of the third embodiment includes a release position recess 92 including a release position recess 92a, a lock position recess 93 including a lock position recess 93a, an inclined portion 135 including an inclined surface 135a, and an inclination. It comprises an inclined portion 136 including a surface 136a.

  In the maximum length contact portion 115 of the third embodiment, the positions of the inclined surfaces 135a and 136a and the lock position concave surface 93a, which are circumferential ranges facing the lock portions 95, 100, and 105, protrude into this range. The lock position is such that the rod 12 cannot move in the contraction direction (downward in FIG. 5) when 81 is positioned, and the release position is a circumferential range that does not face the lock portions 95, 100, and 105. The positions of the concave surface 92a and the inclined surfaces 135a and 136a in the vicinity thereof are lock release positions at which the rod 12 can move in the contraction direction when the projection 81 is located in this range.

  In the third embodiment, when the rod 12 is moved to the extension side (upper side in FIG. 5) and protruded from the cylinder 11, the rod 12 is guided to the guiding portions 96, 101, 106, 107, 111 as in the first embodiment. The protrusion 81 and the cylinder 11 are relatively rotated by any of the guides, and finally contact the protrusion 81 at the lock position concave surface 93a of the overhanging portion 85 to be positioned at the first relative rotation position with respect to the cylinder 11. It becomes a locked state (see, for example, A1 to A4).

  When the cylinder 11 is rotated relative to the rod 12 from the locked state at the first relative rotational position to reach a predetermined second relative rotational position, the protrusion 81 that rotates integrally with the cylinder 11 has gas gas at the initial stage. It slightly moves against the reaction force and rides on one of the inclined surfaces 135a and 136a from the lock position concave surface 93a and travels on either of the inclined surfaces 135a and 136a. Here, when the projection 81 moves by the guide of the inclined surfaces 135a and 136a, the projection 81 moves in the rod axial direction while moving in the rod circumferential direction, and the rod axis direction moves the rod 12 to which the gas reaction force is applied. Since it is the extending direction, the operating force required for relative rotation is further reduced.

  When the cylinder 11 reaches the predetermined second relative rotational position with respect to the rod 12, the protrusion 81 enters the unlocking position concave surface 92a by the gas reaction force and enters the unlocked state in which it contacts. Then, the release position concave surface 92a and the inclined surfaces 135a and 136a on both sides restrict the movement of the protrusion 81 in the rod circumferential direction by the gas reaction force. For example, as shown in FIG. 5, the protrusion 81 runs from the lock position concave surface 93a as shown in A4 to the inclined surface 135a as shown in C5, travels on this inclined surface 135a, and is released as shown in A6. It enters the position concave surface 92a.

  When the rod 12 is inserted into the cylinder 11 so as to move the rod 12 to the contraction side (lower side in FIG. 5) from this unlocked state, the rod 12 has the overhang portion 86 and another overhang as in the first embodiment. After the projection 81 is passed between the surfaces 97a and 102a of the portion 87, the cylinder 11 is brought into contact with the projection 81 on the inclined surface 110a of the overhanging portion 89 so that the protrusion 81 is brought close to the overhanging portion 88 with the inclination. After the relative rotation, the movement in the further contraction direction is allowed (see, for example, A6 to A9).

  According to the third embodiment as described above, the protrusion 81 is guided by the inclined portions 135 and 136 that are positioned in the gas reaction force propelling direction as the lockable position of the maximum length abutting portion 115 moves toward the unlocking position side. Therefore, the operability of the unlocking operation can be further improved.

“Fourth Embodiment”
Next, a fourth 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.

  In the fourth embodiment, the overhang portion 89 is longer in the rod circumferential direction than in the first embodiment, and as a result, the interval between the overhang portion 86 and another overhang portion 87 is wide. . Moreover, in 4th Embodiment, the shape of the maximum length contact part 115 of the overhang | projection part 85 is different from 1st Embodiment.

  That is, the overhang portion 85 of the fourth embodiment does not have the lock position concave surface 93a and the release position concave surface 92a of the first embodiment, and is at the same position as the central position of the overhang portion 89 in the rod circumferential direction. A projecting portion 140 that projects in a tapered shape from the flat surface 91a of the flat portion 91 is formed. The surfaces 140a and 140b on both sides in the rod circumferential direction of the protrusion 140 are formed in a curved concave shape having the same diameter as the diameter of the protrusion 81.

  Here, when the protrusion 81 is in contact with the flat surface 91a and one of the surfaces 140a and 140b of the protrusion 140 at the same time, the end of the protrusion 81 opposite to the protrusion 140 in the rod circumferential direction. The protruding portion 86 is formed at a position farther from the protruding portion 140 than the portion position. The maximum length abutting portion 115 is composed of a flat portion 91 and a projecting portion 140, and the projection 81 is located in the circumferential range of the flat surface 91a that faces the lock portions 95, 100, and 105. At this time, the rod 12 is in a lockable position where the rod 12 cannot move in the contraction direction, and the vicinity of the protrusion 140 that does not oppose the locks 95, 100, 105 on the flat surface 91a is within this range. When the is positioned, the lock release position is such that the rod 12 can move in the contraction direction (downward in FIG. 6).

  In the fourth embodiment, when the rod 12 is moved to the extending side (upper side in FIG. 6) and protruded from the cylinder 11, the rod 12 is guided to the guiding portions 96, 101, 106, 107, 111 as in the first embodiment. The protrusion 81 and the cylinder 11 are relatively rotated by any of the guides, and finally, the lock is located at the first relative rotational position with respect to the cylinder 11 by contacting the protrusion 81 with the flat surface 91a of the overhanging portion 85. It will be in a state (for example, refer to A1-A3, D4). In this locked state, the relative rotation of the rod 12 and the cylinder 11 is restricted by the frictional force generated by the gas reaction force generated between the protrusion 81 and the flat portion 91. In this case as well, even if the cylinder 11 is slightly rotated relative to the rod 12, the concave surface 95a of the overhanging portion 86 or the concave surface 100a of the overhanging portion 87 abuts against the protrusion 81, and the rod beyond that 12 movement in the shrinking direction is restricted.

  When the cylinder 11 is relatively rotated with respect to the rod 12 from the locked state at the first relative rotational position to reach a predetermined second relative rotational position different from the first relative rotational position, the entire range of relative rotation is achieved. The protrusion 81 runs on the flat surface 91a. Therefore, it is not necessary to move the protrusion 81 against the gas reaction force in the entire range of relative rotation, and the operating force required for relative rotation is reduced. When the predetermined second relative rotational position is reached, the lock 81 is brought into the unlocked state in which the protrusion 81 comes into contact with the protruding portion 140. Also at this time, the relative rotation of the cylinder 11 with respect to the rod 12 is restricted by the frictional force generated by the gas reaction force generated between the protrusion 81 and the flat portion 91. For example, as shown in FIG. 6, the protrusion 81 at the position indicated by D4 runs on the flat surface 91a of the rod 12 as indicated by D5, and abuts on the surface 140b of the protrusion 140 as indicated by D6.

  When the rod 12 is inserted into the cylinder 11 so as to move the rod 12 to the contraction side (downward in FIG. 6) from this unlocked state, the rod 12 faces the surface of the overhanging portion 86 and another overhanging portion 87 as shown in D7. After the projection 81 is passed between 97a and 102a, the cylinder 11 is relatively rotated so that the projection 81 comes into contact with the projection 81 at the inclined surface 110a of the overhang portion 89 and the projection 81 is brought close to the overhang portion 88 with the inclination. After that, as shown in D8 and D9, the movement in the further contraction direction is allowed.

  According to the fourth embodiment, since the cylinder 11 can be rotated relative to the rod 12 with a constant operation force in the entire range from the locked state to the unlocked state, the operability of the unlocking operation is further improved. This can be further improved.

  In 1st-4th embodiment, while providing the protrusion 81 in the cylinder side member 79 separately provided in the cylinder 11, the protrusion part 85-89 is directly provided in the rod 12, and it also has a function as a rod side member. However, the rod 12 may be provided with a separate rod-side member having the overhang portions 85 to 89, and the cylinder 11 may be directly provided with a protrusion 81 to function as a cylinder-side member. May be. In contrast to the above, the protrusion 81 may be provided on the rod side member including the rod 12, and the overhang portions 85 to 89 may be provided on the cylinder side member including the cylinder 11.

“Fifth Embodiment”
Next, a fifth embodiment according to the present invention will be described mainly with reference to FIGS. 3 and 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.

  In 5th Embodiment, the dust cover 240 which covers the part which protrudes from the cylinder 11 of the rod 12 is provided. The dust cover 240 has a dust cover main body 243 having a substantially covered cylindrical shape having a cylindrical portion 241 and a lid portion 242 that closes one end thereof, and is rotatable to the rod 12 at the center of the lid portion 242. It is supported. The dust cover 240 is provided so as to be rotatable relative to the rod 12 and the cylinder 11 in a state where movement in the axial direction is restricted with respect to the rod 12.

  On the dust cover main body 243, two inner projecting portions 245 and 246 having an annular shape smaller in diameter than the other main portion 244 having a constant diameter are formed on the opposite side of the cylindrical portion 241 from the lid portion 242 by plastic working. It is formed coaxially. The dust cover main body 243 is formed with a plurality of locking projections 247 protruding inward in the radial direction at positions between the two inner projections 245 and 246.

  And in 5th Embodiment, the 1st Embodiment extended in the cylinder radial direction on the outer peripheral surface of the position on the opposite side to the opening part 23 rather than the inner side protrusion part 27 vicinity of the inner side protrusion part 27 of the trunk | drum 20 of the cylinder 11 is. A plurality of similar protrusions 81 are formed. In this embodiment, the cylinder itself constitutes the cylinder side member of the present invention.

  Also, two sets of five protruding portions 85, 86, 87, 88, 89 similar to those of the first embodiment are arranged inside the cylindrical portion 241 of the dust cover main body 243, in the rod circumferential direction (the horizontal direction in FIG. 3). ) With a 180 degree phase difference, respectively. The inner peripheral member 82 is sandwiched between the inner projecting portions 245 and 246 on both sides of the dust cover main body 243, and the engaging convex portion 247 enters the engaging concave portion 83 on the outer peripheral surface. Thereby, the inner peripheral member 82 is regulated so as not to move in the cylinder axial direction and the cylinder circumferential direction with respect to the dust cover main body 243. The inner circumferential member 82 constitutes a dust cover 240 together with the dust cover main body 243.

  Therefore, the protrusion 81 and the overhanging portions 85, 86, 87, 88, 89 are provided between the cylinder 11 and the dust cover 240. Thereby, no mechanism is provided between the cylinder 11 in the cylinder 11 and the rod 12.

  In addition, the cylinder 11 and the dust cover 240 are provided with a position confirmation portion similar to that of the first embodiment that can visually confirm that the protrusion 81 is locked. This position confirmation portion is formed on the body portion 20 of the cylinder 11 with a triangular mark 122 formed toward the dust cover 240 along the cylinder axial direction, and on the cylindrical portion 241 of the dust cover 240 on the cylinder axial direction. And a triangular mark 123 formed toward the cylinder 11. That is, the position confirmation unit can confirm that the projection 81 is in the lock position facing the cylinder axial direction on the appearance of the dust cover 140.

The effect | action by the above structure is the same as that of each said embodiment.
In the fifth embodiment, the projection 81 is provided directly on the cylinder 11 and the overhang portions 85, 86, 87, 88, 89 are provided on the inner periphery of the dust cover 240. The protrusion 81 may be provided, and the overhanging portions 85, 86, 87, 88, and 89 may be provided on the cylinder 11.
Moreover, you may change suitably the shape of the overhang | projection part 85,86,87,88,89 and the maximum length contact part 115 similarly to the 2nd-4th embodiment.

  The first to fifth embodiments described above have a cylindrical cylinder, and a rod having one end inserted into one end of the cylinder and biased in a protruding direction and rotatable relative to the cylinder. In the cylinder device, a cylinder side member provided with restricted movement at least in the axial direction relative to the cylinder and a rod side member provided with restricted movement in the axial direction at least relative to the rod can be relatively rotated. A protrusion provided on one of the peripheral surface of the cylinder-side member and the peripheral surface of the rod-side member and extending in the radial direction, and the peripheral surface of the cylinder-side member facing the peripheral surface provided with the protrusion, or A maximum length abutting portion provided on either one of the peripheral surfaces of the rod side member and extending in a circumferential direction in which the projection abuts when the rod is in a maximum projecting state; and the maximum length A locking portion that is partially provided in the circumferential direction so as to face the contact portion in the axial direction, the protrusion abuts at the time of contraction, and further restricts the rod from moving in the contraction direction; and the rod includes the rod A guide provided apart from the maximum length contact portion in the axial direction so that the protrusion is guided to a position facing the lock portion in a circumferential direction of the maximum length contact portion when the maximum protrusion state is reached. And a portion. Thereby, when the rod is in the maximum projecting state, the guide portion that is provided apart from the maximum length contact portion in the axial direction opposes the protrusion to the lock portion in the circumferential direction of the maximum length contact portion. By guiding to the position, the lock portion restricts the rod from moving in the contraction direction. As described above, since the protrusion is guided to the position facing the lock portion in the circumferential direction of the maximum length contact portion by the guide portion that is separated from the maximum length contact portion in the axial direction, the gas reaction force is generated when the lock is released. Therefore, it is not necessary to move the rod and cylinder relative to each other. Therefore, the operability of the unlocking operation can be improved.

  In the first to fifth embodiments, the rod is not movable in the contracting direction when the projection in the circumferential direction where the maximum length contact portion faces the lock portion is located in the range. The position in the circumferential direction which is a lockable position and does not face the lock portion is a lock release position where the rod can move in the contraction direction when the protrusion is positioned in the range. Thus, of the maximum length abutting portion extending in the circumferential direction, the circumferential range facing the lock portion is a lockable position where the rod cannot move in the contraction direction when the protrusion is located in this range, In addition, the circumferential range that does not face the lock part is the unlocking position where the rod can move in the contraction direction when the protrusion is located in this range. The protrusion may be moved from the lockable position to the unlocked position along. Therefore, the operability of the unlocking operation can be further improved.

  Further, the fourth embodiment is characterized in that the lockable position of the maximum length contact portion is flat. Thus, when the lock is released, the protrusion may be moved from the flat lockable position to the lock release position. Therefore, the operability of the unlocking operation can be further improved.

  The first to fifth embodiments are characterized in that a recess into which the protrusion is fitted is provided at the unlocking position of the maximum length contact portion. As a result, since the protrusion located at the unlocking position of the maximum length contact portion fits into the recess, the operating force can be accented, and the operator can recognize that it is located at the unlocking position. it can.

  Further, in the second embodiment, a protrusion that can be overcome when the protrusion moves in the circumferential direction along the maximum length contact portion between the lockable position and the unlocking position. It is provided. As a result, when the protrusion moves from the lockable position to the unlock position, the protrusion gets over the protruding portion, so that the operating force can be further accented, and the operator can recognize that it is positioned at the unlock position. Can do.

  In the first to fifth embodiments, the lock portion and the guide portion are respectively formed on one side and the other side of the overhang portion that is provided apart from the maximum length contact portion in the axial direction. It is characterized by being. As described above, since the lock portion and the guide portion are formed on one side and the other side of the overhang portion that are provided apart from each other in the axial direction with the maximum length contact portion, the number of overhang portions is reduced. Therefore, weight reduction and cost reduction can be achieved.

  In the first to fifth embodiments, the lock portion is wider than the diameter of the protrusion. Thus, since the lock portion is wider than the diameter of the protrusion, it can be well regulated so that the rod does not move in the contraction direction.

  The first to fifth embodiments are characterized in that the lock portion is formed with a concave surface facing the maximum length contact portion. Thus, since the surface facing the maximum length contact portion of the lock portion is formed as a concave surface, the rod can be well regulated so as not to move in the shrinking direction.

  In the above first to fifth embodiments, the case where the rod 12 is urged in the protruding direction by the gas pressure in the cylinder has been described. However, the spring biasing force, or the gas pressure and the spring biasing force are described. The rod 12 may be biased in the protruding direction.

  In the above first to fifth embodiments, the case where the opening and closing member is opened by the gas reaction force is shown, but the movement in the opening direction depends on the weight of the opening and closing member, the gas reaction force, and the mounting method of the cylinder device. There are cases where the cylinder device moves only by the gas reaction force of the cylinder device, and cases where the weight of the opening and closing member is assisted by the gas reaction force of the cylinder device and is moved by the operator's force. It is applicable to.

  In the first to fifth embodiments, the gas and a small amount of oil are mixed in the cylinder. However, the present invention is not limited thereto, and a free piston is provided in the chamber on the bottom side in the cylinder. Gas may be sealed on the bottom side, and oil liquid may be sealed on the rod side. By configuring in this way, installation can be performed with the rod protruding side always directed vertically upward.

  Further, in the first to fifth embodiments, the flow path hole 64 is always open. However, the present invention is not limited to this, and the upper surface of the piston 13 in FIG. You may make it provide the fixed orifice of the small flow path area which always communicates with a certain cyclic | annular metal disk valve. As a result, when the rod 12 is contracted, an operation with a small force is possible, and at the time of expansion, the expansion speed can be adjusted by the area of the fixed orifice.

  In the first to fifth embodiments, the rod 12 is fixed and the cylinder 11 side can be rotated. However, the present invention is not limited to this, and the rod 12 side and the cylinder 11 may be relatively rotated. 12 may be provided so as to be rotatable with respect to the mounting bracket 73, and the mounting bracket 32 may be fixed to the cylinder 11. In short, the cylinder side member fixed in the axial direction with the cylinder (may rotate relative to the cylinder) and the rod side member fixed in the axial direction with the rod (may rotate relative to the rod) Any configuration may be used as long as they are relatively rotated.

11 Cylinder 12 Rod (Rod side member)
79 Cylinder side member 81 Projection 85 to 89 Overhang portion 91 Flat portion 92 Release position recess (recess)
95,100,105 Lock part 95a, 100a, 105a Concave surface 96,101,106,107,111,112 Guide part 115 Maximum length contact part 130,131 Protrusion part

Claims (8)

A cylindrical cylinder;
In a cylinder device having one end inserted into one end of the cylinder and biased in a projecting direction and capable of axial movement and relative rotation with respect to the cylinder,
A cylinder side member provided to be restricted in movement in at least the axial direction with respect to the cylinder and a rod side member provided to be restricted in movement in at least the axial direction with respect to the rod are provided so as to be relatively rotatable.
A protrusion provided on one of the peripheral surface of the cylinder side member and the peripheral surface of the rod side member and extending in the radial direction;
A circumference that is provided on either the circumferential surface of the cylinder side member or the circumferential surface of the rod side member that faces the circumferential surface on which the projection is provided, and the projection abuts when the rod is in the maximum projecting state. A maximum length abutting portion extending in the direction;
The rod is partially provided in the circumferential direction so as to be opposed to the maximum length contact portion in the axial direction, and contacts when the projection contracts from the state of contact with the maximum length contact portion, and further the rod A locking part that regulates the movement so that it does not move in the shrinking direction;
Comprising a guiding portion for guiding said projection when said rod is in said maximum protruding state at a predetermined position of the circumferential direction of the maximum length abutment, and the maximum length abutment spaced axially possess a projecting portion that is provided, the,
The cylinder device according to claim 1 , wherein a portion of the lock portion facing the predetermined position is disposed on the opposite side of the projecting portion from the maximum length contact portion in the axial direction . The maximum length abutting portion is a lockable position where a range in the circumferential direction facing the lock portion is a lockable position where the rod cannot move in the contraction direction when the protrusion is positioned in the range. a range of not facing circumferentially, Ri unlocked position der to be movable in the rod contraction direction when the projection is located in the range, the projection, the said maximum length abutment projecting portion cylinder device according to claim 1 in the axial direction through the spaced portion and said relatively rotatable der Rukoto between said unlocked position and said lockable positions with.   The cylinder device according to claim 2, wherein the lockable position of the maximum length abutting portion is a flat portion or a concave portion into which the protrusion is fitted.   4. The cylinder device according to claim 2, wherein a recess portion into which the protrusion is fitted or a protrusion portion to which the protrusion comes into contact is provided at the lock release position of the maximum length contact portion.   A protrusion is provided between the lockable position and the unlocking position in a circumferential direction so that the protrusion can be overcome when the protrusion moves in the circumferential direction along the maximum length contact portion. The cylinder device according to any one of claims 2 to 4. The overhanging portion of claim 1 to 5, characterized in that another portion of the locking portion and the guide portion is restricted from moving in the direction shrinkage the rod on the opposite side are formed The cylinder device according to any one of the above.   The cylinder device according to claim 1, wherein the lock portion is wider than a diameter of the protrusion.   The cylinder device according to any one of claims 1 to 7, wherein the lock portion has a concave surface that faces the maximum length contact portion.

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