KR20130099873A - Cylinder apparatus - Google Patents

Abstract

PURPOSE: A cylinder device is provided to improve operability of a lock releasing operation by reducing rotary torque required for the lock releasing operation. CONSTITUTION: A cylinder device comprises a protrusion (81), a maximum length contact unit (115), lock units (95,100,105) and leading units (96,101,106,107,111,112). The protrusion is installed on a peripheral surface of a cylinder side member (79) and is extended in a diametric direction. The maximum length contact unit is installed on the peripheral surface of a rod (12) and is extended to the direction of the periphery which the protrusion touches when the rod is in a maximum protruding state. The lock unit is partially installed in the peripheral direction in order to face the maximum length contact unit in an axial direction. The lock unit touches the protrusion when the length of the lock unit is shortened and limits the rod not to move in a reduction direction. The leading unit is separated from the maximum length contact unit in the axial direction so that the protrusion is led to a position facing the lock unit among the peripheral directions of the maximum length contact unit when the rod is in a maximum protruding state.

Description

Cylinder unit {CYLINDER APPARATUS}

The present invention relates to a cylinder device.

In a cylinder apparatus, when the rod protrudes from a cylinder as much as possible, there exists a lock state which automatically regulates the movement of a rod to the cylinder direction (for example, refer patent document 1).

Patent Document 1: Japanese Patent Application Publication No. 50-54775

In the cylinder device described above, an operation of pushing the rod against the pressing force is required as the unlocking operation, and there is a problem that the operability is not good.

Therefore, an object of this invention is to provide the cylinder apparatus which can improve the operability of a lock release operation.

In order to achieve the above object, the cylinder device of the present invention is provided with either a circumferential surface of the cylinder-side member or a circumferential surface of the rod-side member, the projection extending in the radial direction, and the circumference facing the circumferential surface on which the projection is provided. A maximum length contact portion provided on the other of the circumferential surface of the cylinder side member or the circumferential surface of the rod side member, the maximum length contact portion extending in the circumferential direction in which the projection contacts when the rod is in the maximum protruding state, the maximum length contact portion and the shaft; A lock portion which is partially installed in the circumferential direction so as to face the direction, and which the projection contacts at the time of length reduction and restricts the rod from moving further in the reduction direction, and when the rod is in the maximum protruding state. The maximum length so as to guide the projection to a position opposite the lock portion in the circumferential direction of the maximum length contact portion; Contact portion and has a configuration having a guide portion is provided spaced apart in the axial direction.

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

BRIEF DESCRIPTION OF THE DRAWINGS It is a front view which made a cross section the part which shows the cylinder apparatus of 1st Embodiment which concerns on this invention.
Fig. 2 is a partially enlarged front sectional view showing the cylinder device of the first embodiment according to the present invention.
3 is an exploded view showing an example of an extension part and a projection trajectory of the cylinder device of the first embodiment according to the present invention.
It is a developed view which shows an example of the extension part and protrusion track of the cylinder apparatus of 2nd Embodiment which concerns on this invention.
It is a developed view which shows an example of the expansion part and protrusion track of the cylinder apparatus of 3rd Embodiment which concerns on this invention.
It is a developed figure which shows an example of the extended part and protrusion track of the cylinder apparatus of 4th embodiment which concerns on this invention.
7 is a partially enlarged front sectional view showing the cylinder device of the fifth embodiment according to the present invention.

≪ First Embodiment >

EMBODIMENT OF THE INVENTION The 1st Embodiment which concerns on this invention is described based on FIG.

Fig. 1 shows a cylinder device of the first embodiment, which is a gas stay (gas spring) in which gas is sealed as a shock absorber, specifically, a working fluid. The cylinder device includes a cylindrical cylinder 11 into which gas (air or nitrogen gas) and a small amount of oil liquid for lubrication are sealed, a rod 12 into which one end of the cylinder 11 is inserted, and a cylinder. (11) has a piston (13) fixed to one end of the rod (12). The piston 13 is slidably fitted in the cylinder 11, and the piston 13 allows the cylinder 11 to have a lower side opposite to the seal 14 and the rod 12 on the rod 12 side. It is divided into two chambers of the chamber 15.

The cylinder 11 has a substantially bottomed cylindrical cylinder body 22 having a substantially cylindrical body portion 20 and a bottom portion 21 fixed to close one end (bottom side) of the body portion 20. ) The cylinder main body 22 has an annular stepped portion 26 having a smaller diameter than the main body portion 25 having a predetermined diameter at the position of the opening portion 23 opposite to the bottom portion 21 of the body portion 20. ) Is coaxially formed by plastic working. In the cylinder body 22, two inner annular projections 27 and 28 having a smaller diameter than the main body portion 25 are formed on the bottom 21 side than the annular stepped portion 26. It is formed coaxially by. In addition, the cylinder main body 22 is provided with the some convex convex part 29 which protrudes radially inward at the position between two inner protrusion parts 27 and 28. As shown in FIG. Moreover, you may make each inner protrusion part 27 and 28 protrude in multiple places in the circumferential direction similarly to the locking convex part 29. As shown in FIG.

The cylinder 11 has a screw member 31 fixed to the bottom 21 of the cylinder body 22 so as to protrude outward along the axial direction, and the mounting bracket 32 is attached to the screw member 31. It is attached rotatably. The mounting bracket 32 has an attachment plate portion 34 having an attachment hole 33 and a retaining plate portion 35 that rises vertically from one end of the attachment plate portion 34. An insertion hole 36 through which the screw member 31 is inserted is formed. The screw member 31 is inserted so that the bearing 38, the retaining plate part 35 of the mounting bracket 32, and the bearing 39 are arranged in order from the bottom 21 side of the cylinder body 22. The nut 40 is screwed to the screw member 31 so as to sandwich them between the bottom portions 21. The mounting bracket 32 is attached to the cylinder 11 in a state where the attachment plate portion 34 is disposed on the side opposite to the bottom portion 21 of the holding plate portion 35. In addition, although the bearings 38 and 39 show the ball bearing, the mounting bracket 32 should just be rotatable with respect to the cylinder main body 22, and slide bearings, such as resin, may be sufficient.

The cylinder 11 has a rod guide 45, a seal ring 46, and a retaining ring 47 disposed inside the opening 23 side of the cylinder body 22, and the rod 12 passes through them. It is inserted in the cylinder 11.

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 thereof. This insertion hole 50 is a slide bearing. As for the outer diameter side of the rod guide 45, the large diameter part 51 which is the largest diameter is formed in one end of an axial direction, the middle diameter part 52 which is smaller than the large diameter part 51 is formed in the middle of an axial direction, A stepped cylindrical shape is formed in the other end in the axial direction with a small diameter portion 53 having a smaller diameter than the middle diameter portion 52.

The seal ring 46 has an annular shape in which an insertion hole 55 along the axial direction is formed at the center thereof. The seal ring 46 consists of 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 radial cross section C-shape in which an annular groove 58 is formed at one end in the axial direction. The rigid member 56 is embedded in the outer diameter side rather than the groove part 58 of the elastic member 57.

The retaining ring 47 has an annular shape in which the insertion hole 60 along the axial direction is formed at the center. The retaining ring 47 is disposed in the main body portion 25 of the cylinder body 22 so as to contact the inner protruding portion 27 on the opening 23 side from the opening 23 side. The seal ring 46 is arranged on the opening 23 side with the groove 58 facing the retaining ring 47 side. And the rod guide 45 is arrange | positioned at the opening part 23 side of this sealing ring 46 with the large diameter part 51 toward the sealing ring 46 side. The large diameter portion 51 of the rod guide 45 is hung on the annular step portion 26 of the cylinder main body 22 from the side opposite to the seal ring 46 in the axial direction, whereby the rod guide 45 The seal ring 46 and the retaining ring 47 are sandwiched between the inner protruding portion 27 and the annular step portion 26 and attached to the cylinder body 22. In addition, the holding ring 47 is unnecessary when the sealing ring 46 can be held on the rod projecting end side by the internal pressure.

The piston 13 has an annular shape in which fitting holes 62 along the axial direction are formed in the center, and on one end in the axial direction, an arrangement concave portion 63 concave in the axial direction so as to surround the fitting holes 62 is provided. Formed. Moreover, the some flow path hole 64 is formed in parallel with the fitting hole 62 in the bottom face position of the arrangement recessed part 63. FIG.

The rod 12 is provided with a main shaft portion 68 having a constant diameter, one end side of the main shaft portion 68, and a fitting shaft portion 69 having a smaller diameter than the main shaft portion 68, and a fitting shaft portion 69. It has the caulking part 70 formed in large diameter by carrying out plastic deformation of the fitting shaft part 69 on the opposite side to the main shaft part 68. As shown in FIG. The rod 12 has its fitting shaft 69 fitted to the fitting hole 62 of the piston 13 on the side opposite to the placement recess 63, and in this state from the piston 13 of the fitting shaft 69. The protruding portion is cocked so as to settle into the placement recess 63, and the caulking portion 70 is formed. The piston 13 is clamped by the caulking part 70 and the main shaft part 68. In this manner, the piston 13 is attached to one end of the rod 12.

Here, the rod 12 is inserted into the rod guide 45, the seal ring 46 and the retaining ring 47 of the cylinder 11 in the main shaft portion 68, the seal ring 46 is a rod ( The gap between the main shaft portion 68 of 12) and the main body portion 25 of the cylinder body 22 is sealed. The piston 13 is fitted to the main body portion 25 on the depth side so as to be relatively rotatable and axially movable than the inner side protrusion portion 28 on the depth side of the cylinder body 22, whereby the rod 12 ) Is relatively rotatable and axially movable relative to the cylinder 11. Moreover, it is preferable to resin-process the outer peripheral surface of the piston 13, and you may provide a seal. As the rod 12 protrudes from the cylinder 11, there is a difference in the hydraulic pressure area in the cylinder 11 of the rod 12 and the piston 13, so that the piston 13 and the rod 12 have a gas reaction force. Is pressed in the protruding direction.

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

As shown in FIG. 2, in the cylinder main body 22, the cylinder side member 79 made of substantially cylindrical metal is fitted and fixed in the cylinder main body 22. As shown in FIG. The cylinder side member 79 is fitted to the main body 25 of the cylinder body 22 in a state of being pinched by the inner protruding portions 27 and 28 on both sides of the cylinder body 22, whereby the cylinder body (22) That is, the cylinder 11 is restricted so as not to move in the axial direction. Further, a plurality of locking recesses 80 concave in the radial direction at the central position in the axial direction of the outer circumferential surface are formed in the cylinder-side member 79 at intervals in the circumferential direction. Rotation with respect to the cylinder main body 22 is restrict | limited by entering the locking convex part 29 of 22, respectively.

On the inner circumferential surface of the cylinder-side member 79, which is either one of the circumferential surface of the cylinder-side member 79 and the circumferential surface of the rod 12, a projection extending in the radial direction of the cylinder 11 from the axially identical position of the inner circumferential surface ( 81) is provided in two or more positions, specifically, 180 degrees of the circumferential direction of an inner peripheral surface. These protrusions 81 have a cylindrical shape along the radial direction of the cylinder body 22 and are disposed between the piston 13 and the retaining ring 47. These projections 81 form two coaxial fitting holes 82 in the cylinder-side member 79 along the radial direction, and form a cylindrical pin 83 in the fitting holes 82 to some cylinder-side member. By inserting so as to protrude inward from 79, the pin 83 is formed by the part which protrudes. This cylinder side member 79 constitutes the cylinder side member of the present invention. In addition, the pin 83 is loosely fitted to the fitting hole 82 so as to be rotatable.

It protrudes along the radial direction of the rod 12 on the outer circumferential surface of the rod 12 which is the other of the circumferential surface of the cylinder side member 79 and the circumferential surface of the rod 12 opposing the circumferential surface on which the projection 81 is provided. As shown in Fig. 3, a plurality of types of extension portions 85, 86, 87, 88, and 89 have two phases different from each other by 180 degrees in the rod circumferential direction (left and right directions in Fig. 3). Are formed in the same manner. These two sets of expansion portions 85 to 89 are in contact with the outer circumferential surface of the projection 81 to guide this. These two sets of expansion parts 85 to 89 are formed by, for example, shaving during the cutting operation of the rod 12 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 made rotatable relative to the cylinder side member 79 fixed to the cylinder 11, so that the rod 12 is also rotatable relative to the cylinder 11.

One set of the extension parts 85-89 is demonstrated. In addition, below, the thing of the same group is shown unless it describes in another group especially. As shown in FIG. 2, the expansion part 85 is arrange | positioned in the insertion side of the rod 12 to the cylinder 11, ie, the reduction side of the rod axial direction, among the expansion parts 85-89. In other words, the expansion portion 85 is disposed below the opening portion 23 of the cylinder 11.

As shown in FIG. 3, the expansion portion 85 extends in the rod circumferential direction (left and right directions in FIG. 3) and is orthogonal to the rod axial direction (up and down directions in FIG. 3) (in other words, in the rod axial direction). Release position recessed surface 92a which consists of the flat surface 91a arrange | positioned at a fixed position, and the curved surface concave to the reduction side (lower side of FIG. 3) of the rod axial direction in the one end position of the rod circumferential direction of the flat surface 91a. ) And a lock position concave surface 93a formed of a curved surface concave shallower than the release position concave surface 92a on the reduction side in the rod axial direction at an intermediate position of the flat surface 91a. The side opposite to the flat surface 91a of the release position concave surface 92a is connected to the flat surface 91a of another pair, and the release position of the other side is also opposite to the release position concave surface 92a of the flat surface 91a. It is connected to the recessed surface 92a. Here, the release position concave surface 92a and the lock position concave surface 93a form an arc shape with a larger diameter than the diameter of the projection 81, and are different in phase by 90 degrees in the rod circumferential direction.

As shown in FIG. 2, the expansion parts 86 and 87 are arranged on the protruding side from the cylinder 11 of the rod 12, that is, on the extension side in the rod axial direction, as shown in FIG. 2. In other words, the expansion parts 86 and 87 are arranged on the opening 23 side of the cylinder 11 rather than the expansion part 85. As shown in FIG. 3, the expansion parts 86 and 87 have a symmetrical shape centering on the lock position recessed surface 93a in the rod circumferential direction.

The expansion part 86 has a substantially triangular shape, and becomes the concave surface 95a which consists of the curved surface concave to the extension side of the rod axial direction (reduced side of FIG. 3) in the rod axial direction. Moreover, the inclined surface 96a which inclines so that the extension | stretching side of the rod axial direction may be located in the reduction position (extension part 85 side) of the rod axial direction as the lock position concave surface 93a side of the rod circumferential direction is provided. Lock position in the circumferential direction of the rod of the concave surface 95a and the inclined surface 96a The surface 97a which connects the opposite sides to the concave surface 93a is along the rod axial direction, and on the extension of this surface 97a The flat surface 91a side of the release position recessed surface 92a is arrange | positioned. In the rod circumferential direction, the surface 97a of the expansion 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 expansion portion 86 is in the lock position. It is arrange | positioned in the outer range of the recessed surface 93a. The concave surface 95a has a larger diameter than the diameter of the projection 81, and the width | variety of the rod circumferential direction of the concave surface 95a becomes wider than the diameter of the projection 81. As shown in FIG.

The expansion part 87 is substantially triangular-shaped, and becomes the concave surface 100a which consists of the curved surface concave to the extension side of the rod axial direction (reduced side of FIG. 3) in the rod axial direction. Moreover, the inclined surface 101a which inclines so that the extension side of the rod axial direction may be located in the reduction position (extension part 85 side) of the rod axial direction as the lock position concave surface 93a side of the rod circumferential direction is provided. Lock position in the circumferential direction of the rod of the concave surface 100a and the inclined surface 101a The surface 102a which connects the opposite sides to the concave surface 93a is along the rod axial direction, and on the extension of this surface 102a The end side opposite to the release position recessed surface 92a of the flat surface 91a (that is, the end side opposite to the flat surface 91a of this pair of the release position recessed surface 92a of another pair) is arrange | positioned. In the rod circumferential direction, the surface 102a of the expansion portion 87 is disposed in the inner range of the release position concave surface 92a of another set, and the end portion on the side opposite to the surface 102a of the expansion portion 87 It is arrange | positioned in the outer range of the lock position recessed surface 93a. The concave surface 100a has a larger diameter than the diameter of the protrusion 81, and the width | variety of the rod circumferential direction of the concave surface 100a is wider than the diameter of the protrusion 81. As shown in FIG.

The expansion portion 88 is disposed on the extension side (the opposite side to the expansion portion 85) in the rod axial direction than the expansion portions 86 and 87, and the lock position concave surface 93a and the position in the rod circumferential direction. I'm guessing. The expansion portion 88 has a substantially equilateral triangular shape, and has a concave surface 105a formed of a curved surface concave toward the extension side in the rod axial direction. Moreover, it is set as the pair of inclined surfaces 106a and 107a which incline so that the extension side of the rod axial direction may become the inner side of the rod circumferential direction so that it may be located on the extension side of the rod axial direction. The inclination surfaces 106a and 107a have the same angle with respect to the rod axial direction, and the height of the rod axial direction is also equal. Therefore, the inclined surfaces 106a and 107a form a line symmetry with respect to the line along the rod axial direction through the angle between them. This corner portion coincides with the center of the lock position concave surface 93a of the expansion portion 85 in the rod circumferential direction.

In the rod circumferential direction, an end portion on the expansion portion 86 side of the expansion portion 88 is disposed on the expansion portion 87 side in the inner range of the expansion portion 86, and the expansion portion of the expansion portion 88. The end part of the side of 87 is arrange | positioned at the side of the expansion part 86 of the inner side range of the expansion part 87. The expansion part 88 matches the center of the rod circumferential direction with the center of the lock position recessed surface 93a, and overlaps with the whole range of the rod circumferential direction of this lock position recessed surface 93a. The concave surface 105a has a larger diameter than the diameter of the projection 81, and the width of the concave surface 105a in the circumferential direction of the rod is wider than the diameter of the projection 81. In addition, the concave surface 105a has a rod circumferential direction length longer than the rod circumferential direction length of the lock position concave surface 93a, and the protrusion 81 and the rod circumference fitted to the lock position concave surface 93a. The rods face each other in the direction of the rod axis by aligning the positions in the directions.

The expansion part 89 is arrange | positioned rather than the expansion part 88 on the extension side of the rod axial direction (the opposite side to the expansion part 85), and arrange | positions the release position recessed surface 92a and a position in the rod circumferential direction. I'm guessing. The expansion portion 89 has an approximately parallelogram shape, and the inclined surface 110a is inclined so that the reduction side in the rod axial direction is located on the extension side in the rod axial direction as the expansion side 86 in the rod circumferential direction. It is. Moreover, the inclined surface 111a inclines so that it may be located in the extension side of the rod axial direction as the extension side of the rod axial direction is the expansion part 86 side of the rod circumferential direction. The surface 112a which connects the inclined surface 110a and the expansion part 86 side of the inclined surface 111a in the circumferential direction of the rod is along the rod axial direction, and the expansion part 86 is extended on this surface 112a. The side 97a and the extended part 86 side of the release position recessed surface 92a are arrange | positioned. The surface 113a which connects the edge parts on the opposite side to the expansion part 86 of the inclined surface 110a and the inclined surface 111a in the circumferential direction of the rod is along the rod axial direction, and has a different set on the extension of this surface 113a. The end side opposite to the surface 102a of the expansion part 87 and the expansion part 86 of the release position recessed surface 92a is arrange | positioned. The expansion part 89 makes the center of the rod circumferential direction coincide with the center of the release position concave surface 92a, and is 90 degrees out of phase with respect to the center of the expansion part 88 in the rod circumferential direction.

A gas reaction force is applied to the piston 13 and the rod 12 shown in FIG. 2, and by this gas reaction force, the piston 13 moves to reduce the chamber 14 while expanding the chamber 15. . In doing so, the rod 12 moves to the extension side which protrudes from the cylinder 11. In this movement, when the rod 12 is close to the maximum protruding state most protruding from the cylinder 11, the rod 12 is attached to the protrusion 81 of the cylinder-side member 79 fixed to the cylinder 11. As shown in FIG. 3, the inclined surface 106a, the inclined surface 107a or the inclined surface of the expanded portion 88 on the extension side (upper side in FIG. 3) among the extended portions 85 to 89. Contact is made at 111a or directly at the inclined surface 96a of the expansion portion 86 on the reduction side (lower side in FIG. 3) or at the inclined surface 101a of the expansion portion 87.

In the case where the projection 81 is contacted with the inclined surface 106a, the inclined surface 107a of the expansion portion 88, or the inclined surface 111a of the expansion portion 89, any one of these inclined projections 81, that is, the cylinder ( Relatively rotate 11). In the case where the projection 81 is in contact with the inclined surface 106a of the expansion portion 88, the projection 81 is then in contact with the inclined surface 96a of the expansion portion 86, and the inclined surface 107a of the expansion portion 88 is used. Is in contact with the inclined surface 101a of the expansion portion 87, and when in contact with the inclined surface 111a of the expansion portion 89, the next inclination surface 101a of the other portion of the expansion portion 87 is Contact from

When the inclined surface 96a of the expansion portion 86 or the inclined surface 101a of the expansion portion 87 is brought into contact with the projection 81, the inclined cylinder 11 of any of these is relatively rotated. A contact is made at the lock position concave surface 93a of the extension 85. Thereby, the rod 12 will be in the largest protrusion state which protrudes from the cylinder 11 most. For example, as shown in FIG. 3, with respect to the protrusion 81 relatively close to the position indicated by A1, the rod 12 is formed on the inclined surface 106a of the expansion portion 88 as shown by A2. Contact with the inclined protrusion 81, that is, the cylinder 11, and then rotate relative to the inclined surface 96a of the expansion portion 86 as shown by A3. After relatively rotating (11), as shown by A4, it contacts with the lock position recessed surface 93a of the expansion part 85. As shown in FIG. Here, since the projection 81 is comprised so that the pin 83 may be rotatably loosely fitted with respect to the fitting hole 82, as shown in FIG. 2, the inclined surfaces 96a, 101a, 106a, which are shown in FIG. In the relative movement along any one of 107a and 111a, frictional resistance is reduced by rotating.

In the maximum projecting state described above, the enlarged portion 85 is pressed against the projection 81 by the gas reaction force applied to the rod 12 through the piston 13 shown in Fig. 2, The state in which the concave surface 93a contacts the protrusion 81 is maintained. From the above, at least the inclined surface 96a of the expansion portion 86 or the inclined surface 101a of the expansion portion 87 has the projection 81 positioned on the rear surface of the expansion portion 88 and the position in the circumferential direction of the rod. It guides so that it may be located in the lock position recessed surface 93a, and the cylinder 11 is made to rotate relative to each inclination rod 12 at that time.

When the projection 81 contacts 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 when the inclined surface 96a of the expansion portion 86 or the inclined surface 101a of the expansion portion 87 is provided on the outer circumferential surface of the rod 12, the projection 12 81, the cylinder 11 is rotated relative to the rod 12 to guide the predetermined first relative rotational position.

The state in the said 1st relative rotation position is a locked state, and when it inserts into the cylinder 11 in order to move the rod 12 to the reduction side (lower side of FIG. 3) in this state, it will be in the lock position recessed surface 93a. After the expansion portion 85 is spaced apart in the rod axial direction, the concave surface 105a of the expansion portion 88 opposed to the lock position concave surface 93a in the rod axial direction is brought into contact with the protrusion 81 that was located. This holds | maintains and restrict | limits the movement of the further rod 12 with respect to the cylinder 11 with respect to the reduction direction. In addition, even if the cylinder 11 may rotate somewhat relative to the rod 12 at this time, the recessed surface 95a of the expansion part 86 or the recessed surface 100a of the expansion part 87 shown in FIG. ) Contacts the projection 81 to restrict the movement of the further rod 12 in the reduction direction.

As a result, the cylinder device is in a locked state in which the reduction stroke is automatically regulated when the rod 12 reaches the maximum protruding state most protruding from the cylinder 11 shown in FIG. That is, the expansion parts 86, 87, and 88 shown in FIG. 3 provided on the outer circumferential surface of the rod 12 have a first relative relationship between the cylinder 11 and the rod 12 in the state where the rod 12 protrudes. When the rotational position is reached, the projections 81 are opposed to each other in the axial direction, and when the rod 12 moves in the insertion direction, the rods 12 are in contact with the projections 81 to lock the projections 81. Here, the concave surfaces 95a, 100a, 105a of the expansion portions 86, 87, 88 are adapted to restrict the rod 12 from contracting beyond them if the center of the projection 81 is within the respective range of the rod circumferential direction. Then, the projection 81 is guided to the center position of the rod circumferential direction, which is each deepest position.

When the cylinder 11 is rotated relative to the rod 12 from the locked state in the first relative rotational position and becomes a predetermined second relative rotational position different from the first relative rotational position, the cylinder 11 is integrated with the cylinder 11. The furnace protrusion 81 also rotates relative to the rod 12 (idle). By the rotational movement of this projection 81, the rod 12 is slightly moved toward the reduction side of the rod axial direction against the gas reaction force at the initial stage, and is moved from the lock position concave surface 93a to the flat surface 91a. The projection 81 is raised, and the projection 81 is moved on the flat surface 91a, and then at the end of the release position concave surface 92a by the gas reaction force to the extension side in the rod axial direction. The protrusion 81 is moved to enter the release position concave surface 92a. In this state, the release position concave surface 92a is in contact with the projection 81 by gas reaction force and is in a state of restricting movement in the rod circumferential direction. That is, the release position recessed surface 92a is provided in the outer peripheral surface of the rod 12, and when the cylinder 11 is located in the predetermined 2nd relative rotation position with respect to the rod 12, the protrusion 81 and the rod By opposing to the axial direction, the projection 81 is contacted by the gas reaction force, thereby restricting the relative movement in the rotational direction of the cylinder 11 with respect to the rod 12. For example, as shown in FIG. 3, with respect to the projection 81 at the position indicated by A4, the rod 12 is a flat surface 91a as shown by A5 in the lock position concave surface 93a. The projection 81 is raised, the projection 81 is driven on the flat surface 91a, and the projection 81 enters the release position concave surface 92a as shown by A6. Also at this time, the projection 81 rotates to reduce the frictional resistance during relative movement along the lock position concave surface 93a, the flat surface 91a, and the release position concave surface 92a.

The state which became the said 2nd relative rotation position is a lock release state, and when this rod 12 is inserted in the cylinder 11 in order to move the rod 12 to the reduction side (lower side of FIG. 3), the rod 12 will be, After passing the projection 81 between the expansion portion 86 and the surfaces 97a and 102a of the expansion portion 87 of the other set, the projection 81 contacts the projection 81 on the inclined surface 110a of the expansion portion 89. After the cylinder 11 is rotated relative to the inclined protrusion 81 close to the expansion portion 88, the movement in the reduction direction is further allowed. For example, as shown in FIG. 3, with respect to the projection 81 in the position shown by A6, the rod 12 is extended by 86 and another set of expanded 87 by the A12. After passing the projection 81 therebetween, the inclined surface 110a of the expansion portion 89 contacts the projection 81, and as shown by A8, the inclined projection 81 to the expansion portion 88. After relatively rotating simultaneously with the cylinder 11 to bring it close, as shown by A9, the movement in the reduction direction is further allowed. Even when the inclined surface 110a is relatively moved, the projection 81 rotates to reduce the frictional resistance.

By the above, the extension part edge part edge part of the expansion part 85 containing the flat surface 91a, the release position recessed surface 92a, and the lock position recessed surface 93a has the rod 12 from the cylinder 11. The maximum length contact part 115 which contacts the protrusion 81 is comprised when it is the maximum protrusion state which protrudes most. That is, the maximum length contact portion 115 includes a flat portion 91 having a flat surface 91a along the rod axis orthogonal direction and a release position concave portion having a release position concave surface 92a concave from the flat surface 91a. The concave portion 92 and the lock position concave portion 93 having the lock position concave surface 93a concave in the flat surface 91a are included.

Further, the end edge portion including the concave surface 105a of the expansion 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 projection 81 at the time of reducing the length of the cylinder device. ) Constitutes a lock portion 105 for restraining the rod 12 from moving further in the reduction direction, and an end edge portion including the concave surface 95a of the extension portion 86 also has the same lock portion ( 95 and the edge part including the concave surface 100a of the expansion portion 87 also constitute the same lock portion 100. As for these lock parts 95, 100 and 105, the surface 95a, 100a, 105a which opposes the maximum length contact part 115 is formed in concave surface. All of the lock portions 95, 100, and 105 are wider in the rod circumferential direction than the diameter of the projection 81.

As for the maximum length contact part 115, the position of the flat surface 91a which is the range of the circumferential direction which opposes the said lock parts 95, 100, 105, and the lock position recessed surface 93a is the projection 81 in this range. Is located in the lockable position where the rod 12 cannot move in the reduction direction when the position is positioned, and the release position concave surface 92a which is a range in the circumferential direction not facing the lock portions 95, 100, 105. The position of is a lock release position in which the rod 12 can move in a reduction direction when the projection 81 is located in this range. Accordingly, the lockable position of the maximum length contact portion 115 is the flat position 91 having the flat surface 91a along the rod axis orthogonal direction and the lock position recess 93 having the lock position concave surface 93a. In the unlocking position of the maximum length contact portion 115, a release position recess 92 having a release position recessed surface 92a to which the projection 81 is fitted is provided.

Further, the end edge portion including the inclined surface 106a of the expansion portion 88 extends the protrusions 81 in the circumferential direction of the maximum length contact portion 115 when the rod 12 is in the maximum protruding state. To guide the concave surface 105a of the lock portion 105 to form a guide portion 106 provided spaced apart from the maximum length contact portion axially, and the inclined surface 107a of the expansion portion 88 End edge portion including the same guide portion 107 is also included, the end edge portion including the inclined surface 111a of the expansion portion 89 also includes the same guide portion 111, the surface 112a of the extension portion 89 The end edge part including the induction part 112, the same induction part 112, and the inclination surface 96a of the expansion part 86, and the end edge part including the inclination surface 101a of the extension part 87, are also the same. The induction part 101 is comprised, respectively. The guide portions 96, 101, 106, 107 and 111 automatically rotate the relative rotational positions of the cylinder 11 and the rod 12 to the lock position when the rod 12 is extended to the maximum length.

The lock part 95 and the induction part 96 are formed in one side and the other side of the expansion part 86 which are installed axially spaced apart from the maximum length contact part 115, respectively, and the lock part 100 and the induction part 101 are formed on one side and the other side of the same extension part 87, and the lock part 105 and guide parts 106 and 107 are formed on the one side and the other side of the same extension part 88, respectively. have.

The projections 81 and the extensions 85 to 89 automatically lock the rod 12 to the maximum length with respect to the cylinder 11 such that they cannot be reduced in length, and the cylinder 11 is manually opposed to the rod 12. When rotated, the cam mechanism 120 which releases a lock so that length reduction is possible is comprised, This cam mechanism 120 is provided in the position between the cylinder 11 and the rod 12 in the cylinder 11. As shown in FIG.

1, the projection 81 is formed on the bottom 21 of the body part 20 of the cylinder 11 and the mounting plate 34 of the mounting bracket 32, as described above, That the rod 12 and the cylinder 11 are located at a predetermined first relative rotational position, in other words, the rod 12 12 and the cylinder 11 are in the locked position, as shown in Fig. The positioning unit 121 is a triangular mark 122 formed on the trunk portion 20 of the cylinder 11 so as to face the attachment plate portion 34 along the cylinder axial direction, and the attachment plate portion of the mounting bracket 32. 34 is made of a triangular mark 123 formed to orient the body portion 20 along the rod axial direction.

And when these marks 122 and 123 align the position of a cylinder circumferential direction, and it is in the state which opposes to a cylinder axial direction, the projection 81 will go around the rod to the lock position recessed part 93 of the expansion part 85. Direction is aligned, that is, the rod 12 and the cylinder 11 are in a predetermined first relative rotational position, in other words, the relative rotational positions of the rod 12 and the cylinder 11 are locked positions. It becomes the state in. On the other hand, when these marks 122 and 123 are shifted by a predetermined 90 degree in the position in the rod circumferential direction, the projection 81 fits the position in the rod circumferential direction to the release position recessed portion 92 of the expansion portion 85. State, that is, the state in which the rod 12 and the cylinder 11 are located at a predetermined second relative rotational position, in other words, the state in which the relative rotational position of the rod 12 and the cylinder 11 is in the unlocked position. do. In the mark 122 formed in the cylinder 11, the character of "LOCK" which lays out that the relative rotation position of the cylinder 11 and the rod 12 is in the locked position is provided.

In addition, at the time of attachment to a mounting object, an operator attaches the mounting bracket 73 to one side of a mounting object, loosens the nut 40, and adjusts the mounting bracket 32 to the other side of a mounting object. It will be adjusted and attached to the other side of the mounting object. Therefore, the rotation angle with respect to the cylinder 11 of the mounting bracket 32 will be determined at this point. For this reason, 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 12 is in the maximum protruding state with the nut 40 loosened. In accordance with this, it is preferable to attach the mark 122 of the cylinder 11 later. Therefore, the mark 122 of the cylinder 11 is set as the seal label which can be attached later. In contrast, 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 write the character of "UNLOCK" which shows the unlocking position which the projection 81 is located in the unlocking position, and both are described. You may.

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

In the cylinder device, the attachment plate portion 34 of the mounting bracket 32 attached to the cylinder 11 and the attachment plate portion 75 of the mounting bracket 73 attached to the rod 12 include attachment holes 33 and 74. By the fastening members respectively penetrated through), for example, it is attached to the base member (not shown) and the opening / closing member (not shown) which swing with respect to the base member. In the case where the opening and closing member is normally closed, the direction of attachment is preferably attached so that the protruding side (upper side in the drawing) of the rod 12 of the cylinder device is lowered when the opening and closing member is closed. This is because it is suitable for the oil liquid in the cylinder to contact the sealing ring 46 if possible, in order to secure the sealing property and the sliding property.

The rod 12 is most inserted into the cylinder 11 when the opening and closing member is in the closed state close to the base member, and the rod 12 is in the open state when the opening and closing member is most spaced apart from the base member. Most protrudes from (11). Here, since the high pressure gas is filled in the chambers 14 and 15, the gas reaction force which is the pressing force of the direction which protrudes the rod 12 from the cylinder 11 by the hydraulic pressure area difference generate | occur | produces in the piston 13 here. Doing. Therefore, in the closed state, the opening / closing member is maintained in the closed state with its weight prevailing over the gas reaction force, or in the closed state by the locking mechanism (not shown) with respect to the base member.

At the time of swinging the opening / closing member, the piston 13 moves in the cylinder axial direction in the cylinder 11 to change the volume of the seals 14 and 15, and at that time, The flow path hole 64 of the piston 13 controls the flow of oil and generates a damping force to suppress the swinging speed of the opening and closing member. Oil and gas are enclosed in the cylinder 11, and the quantity of oil is enclosed by the amount which oil flows into the distribution hole 64 from the position from which the rod 12 approaches the maximum protrusion 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. As a result, the projection 81 moves to the extension portions 85 to 89 in the rod axial direction. At that time, the protrusions 81 are guide parts 96 and 101 of the expansion parts 86 and 87 when the relative positions in the rod circumferential direction are twisted with respect to both the expansion part 88 and the expansion part 89. The lock position concave portion 93 is brought into direct contact with any one of them, and the rod 12 and the cylinder 11 are rotated relative to each other while the rod 12 and the cylinder 11 are relatively moved to the expansion portion 85 side in the rod axial direction. It stops in contact with the bottom of the. In this state, the rod 12 is in a maximum protruding state most protruding from the cylinder 11, and the rod 12 and the cylinder 11 are positioned at the first relative rotational position.

On the other hand, when the position of the rod circumferential direction of the protrusion 81 is matched with the expansion portion 88, the protrusion 81 contacts any one of the guide portions 106 and 107, and guides the rod 12 with the guide. While relatively rotating the cylinder 11, it moves to the extension part 86, 87 side of a rod axial direction relatively, and moves away from the expansion part 88 in the circumferential direction of a rod, and expands the rod axial direction 86 relatively. ) Or the extension part 87 side, and contact with any one of the induction parts 96 and 101 of the extension parts 86 and 87, and after that, the rod 12 and the cylinder ( While relatively rotating 11), it is further moved relative to the expansion portion 85 side in the rod axial direction, and comes into contact with the bottom of the lock position recess 93 to stop.

In addition, when the position of the rod circumferential direction of the protrusion 81 is matched with the extension portion 89, the protrusion 81 contacts any one of the guide portions 111 and 112, and guides the rod 12 with the guide. While relatively rotating the cylinder 11, it moves toward the expansion portion 86 in the rod axial direction or the expansion portion 87 of the other set, and moves away from the expansion portion 89 in the circumferential direction of the rod, and then the rod relatively It moves to the axial expansion part 86 or another set of expansion part 87 side, and contacts with either of the guide parts 96 and 101 of these expansion parts 86 and 87, and after that, as mentioned above, The guide 12 rotates the rod 12 and the cylinder 11 relative to each other, and moves relatively to the expansion portion 85 side in the rod axial direction, so that the lock position recess 93 or another set of lock position recess 93 It stops in contact with the floor.

That is, in either case, the projection 81 adjusts the position in the rod circumferential direction to the lock position recess 93 that is concave on one side of the rod axial direction. Thus, when the projection 81 is located in the lock position recess 93, as mentioned above, the rod 12 will be in the maximum protruding state, and the rod 12 and the cylinder 11 will be in the first relative rotational position. In addition, the marks 122 and 123 of the positioning unit 121 coincide with the positions in the rod circumferential direction.

Next, when the operator rotates the cylinder 11 in one of 90 degrees in the state where the protrusion 81 is located in the lock position recess 93, the protrusion 81 causes the lock position recess 93. By the guide of the light, it moves to the opposite side to the expansion part 85 of the rod axial direction relatively against gas reaction force, and then moves to the rod circumferential direction along the flat part 91, and the release position recessed part 92 At the position of < RTI ID = 0.0 >), it enters the release position recess 92 by gas reaction force and comes into contact with its bottom to stop. Thereby, the rod 12 and the cylinder 11 are located in the 2nd relative rotation position which unlocks.

At this time, while the projection 81 moves the flat portion 91, the gas reaction force generates a rotational resistance in the cylinder 11, but at the position of the release position recess 92, the projection 81 is caused by the gas reaction force. ) Naturally enters into the release position concave portion 92 and comes into contact with the bottom thereof, whereby the rotational resistance decreases. Further, if it wants to exit from the release position concave portion 92 again, rotational resistance due to gas reaction force is generated again. As a result, when the projection 81 is positioned in the release position concave portion 92, an accent occurs in which the rotational operation force of the cylinder 11 is weaker than before and after, thereby generating a so-called click feeling.

With this feeling of click, the operator judges that the lock is in the unlocked state, and releases the swing member in the closing direction against the gas reaction force. As a result, the rod 12 moves to the rod insertion side, and the protrusion 81 moves to the opposite side to the extension 85 in the rod axial direction. At that time, since the position in the rod circumferential direction of the protrusion 81 matches the inclined surface 110a of the expansion portion 89, the protrusion 81 contacts the inclined surface 110a and guides the rod 12 with the guide. While relatively rotating the cylinder 11, it moves to the expansion part 88 side of a rod circumferential direction relatively, and moves away from the inclined surface 110a, and after that, the projection 81 expands relatively in the rod axial direction as it is. It moves to the opposite side to (85). Thereby, the rod 12 moves to the rod insertion side, and the opening-closing member is closed, and the opening-closing member is locked by the locking mechanism after that as needed.

Further, in a state where the projection 81 is located in the lock position recess 93, if the operator swings the opening / closing member in the closing direction against the gas reaction force without rotating the cylinder 11, the rod 12 Although the projection 81 moves relative to the extension portion 85 in the rod axial direction, the projection 81 is moved to the position of the lock portion 105 in the rod circumferential direction. Therefore, it contacts with the concave surface 105a of the lock part 105, and stops at the bottom position, and the relative movement to the opposite side to the further expansion part 85 of the rod axial direction is regulated. In other words, the locked state.

Moreover, when the cylinder 11 is rotated relatively in the range which does not locate the protrusion 81 in the release position recessed part 92 in the state in which the protrusion 81 is located in the lock position recessed part 93, the opening-closing member Rocking in the closing direction against the gas reaction force causes the rod 12 to move to the rod insertion side, and the protrusion 81 moves to the opposite side relative to the extension portion 85 in the rod axial direction, but the protrusion 81 ) Is positioned in the rod circumferential direction with one of the lock portions 95, 100, and stops at the bottom position in contact with any one of the concave surfaces 95a, 100a of the lock portions 95, 100. Then, the relative movement to the side opposite to the expansion portion 85 in the further rod axial direction is restricted. In other words, the locked state.

For example, when the operator places a load on the opening and closing member and the mass of the opening and closing member increases, or the gas pressure in the cylinder 11 decreases, the gas reaction force decreases, and the cylinder device is loaded. If it is not possible to keep the 12 in the maximum protruding state, that is, when the opening / closing member cannot be kept in the fully open state, the opening / closing member swings in the closing direction against the gas reaction force, and the protrusion 81 concaves the lock position. The state in which it is located in the part 93, that is, the cylinder 11 and the rod 12 remain in the 1st relative rotational position, the rod 12 moves to the rod insertion side, and the projection 81 is relatively axial in the rod It is moved to the opposite side to the expansion portion 85 of. Also in this case, since the protrusion 81 is in the position of the lock part 105 and the rod circumferential direction, the protrusion 81 comes into contact with the concave surface 105a of the lock part 105 and stops at the bottom position thereof. The relative movement to the opposite side to the axial extension 85 is restricted. Therefore, the lock 12 is moved to the rod insertion side of the rod 12, and the open / close member is kept open.

From this state, when the opening / closing member is closed, the operator is willing to close the opening / closing member, and the cylinder 11 is rotated so that the projection 81 is moved around the rod on the concave surface 105a of the lock portion 105. If it moves outward, since the lock part 105 which regulated the movement on the opposite side to the expansion part 85 of the rod axial direction of the projection 81 will not exist, the projection 81 will be thereafter. Is moved to the opposite side to the extension portion 85 in the rod axial direction, the rod 12 is moved to the insertion side, and the opening and closing member is in a closed state, and then the opening and closing member is locked by the locking mechanism as necessary. do.

In the cylinder device described in Patent Document 1, when the rod is protruded as far as possible from the cylinder, the lock state is automatically controlled to regulate the movement of the rod in the insertion direction. However, in this cylinder device, the lock release operation is relatively high. There was a problem that the operation of pushing the rod relatively large against the gas reaction force was necessary, and the operability of unlocking was not good.

On the other hand, according to the first embodiment described above, when the rod 12 reaches the maximum protruding state, the guiding portions 96, 101, 106, 107, and 111 provided spaced apart from the maximum length contacting portion 115 in the axial direction Guiding the projection 81 to the lock position concave portion 93 facing the lock portion 105 in the circumferential direction of the maximum length contact portion 115 so that the lock portion 105 moves the rod 12 downward So as not to move in the direction. In this way, the projections 81 are separated from the lock portion 105 in the circumferential direction of the maximum length contact portion 115 by the guide portions 96, 101, 106, 107, and 111 provided axially spaced apart from the maximum length contact portion 115. Since it leads to the opposite lock position recess 93, it is not necessary to relatively move the rod 12 and the cylinder 11 against the gas reaction force at the time of unlocking. That is, when the protrusion 81 is guided to the lock position recess 93 according to the shape of the maximum length contact portion 115 by the gas reaction force, the protrusion 81 is relatively moved against the gas reaction force upon release of the lock. What you need to do is eliminate this need. Therefore, the rotational torque required for the lock release operation can be reduced, and the operability of the lock release operation can be improved. In particular, when it is arranged in the space which is narrow and it is hard to perform rotation operation by hand, the effect which can reduce rotation torque becomes high. That is, for example, in the case of a space where the fist can not be inserted and only the fingertip can be inserted, the cylinder 11 and the rod 12 can be rotated relative to each other only by the fingertip force, and the lock can be released.

In addition, since the operator's intention to rotate the cylinder 11 and the rod 12 relative to each other is necessary, it is possible to prevent the lock from being inadvertently released. In addition, since the cylinder 11 and the rod 12 are manually rotated relative to each other, lock release is also facilitated. Therefore, usability can be improved. In addition, since the lock release operation is an operation of relatively rotating the cylinder 11 and the rod 12, the lock release operation is completed without taking into account the swinging of the release member and the like, so that the mounting space is not restricted.

More specifically, the induction parts 96, 101, 106, 107, and 111 form the relative rotational position of the cylinder 11 and the rod 12 when the rod 12 extends to the maximum length. It automatically rotates to the lock position that regulates the shrinkage near the maximum length. Therefore, when the rod 12 is extended to the maximum length, the rod 12 is automatically locked to restrict the reduction of the rod 12 near the maximum length. In addition, when the relative rotational position of the cylinder 11 and the rod 12 is set to the unlocking position which allows manual reduction in the vicinity of the maximum length, the rod 12 can be reduced in the vicinity of the maximum length. Therefore, since the operation which makes the relative rotation position of the cylinder 11 and the rod 12 into a unlocking position is necessary, it can prevent that a lock is inadvertently released. In addition, since the relative rotational position of the cylinder 11 and the rod 12 is set to the lock release position, the release of the lock can be facilitated. Therefore, usability can be improved. In addition, since the unlocking operation is an operation of setting the relative rotation positions of the cylinder 11 and the rod 12 to the unlocking position, the lock release operation ends without considering swinging of the release member and the like and is not restricted by the mounting space.

Moreover, the range of the flat part 91 and the lock position recessed part 93 of the circumferential direction which opposes the lock part 95 among the largest length contact part 115 extended in the circumferential direction is protrusion 81 in this range. Is a lockable position at which the rod cannot move in the reduction direction when the position is located, and the range of the release position concave portion 92 in the circumferential direction that does not oppose the lock portion 95 has a projection 81 in this range. Since the rod 12 is a lock release position that can be moved in the reduction direction when positioned, the maximum length contact portion extending in the circumferential direction of the protrusion 81 that contacts the maximum length contact portion 115 by gas reaction force at the time of unlocking. It is good to move to the unlocking position from the lockable position along 115. Therefore, the rotational torque required for the lock release operation can be reduced, and the operability of the lock release operation can be further improved.

Moreover, since the lockable position of the maximum length contact part 115 has the flat part 91, when the lock is released, the projection 81 which contacts the maximum length contact part 115 by gas reaction force is flat part 91. It is good to move from the lockable position which has a to a lock release position. Therefore, the rotational torque required for the lock release operation can be reduced, and the operability of the lock release operation can be further improved.

In addition, the projection 81 positioned at the unlocking position of the maximum length contact portion 115 can be applied to the release position recess 92 by gas reaction force to give an accent to the operating force, and to the operator that the position is at the unlocking position. It can be recognized. That is, when the cylinder 11 and the rod 12 are in the predetermined second relative rotation position to be in the unlocked state different from the predetermined first relative rotation position, the release position concave portion 92 defining the unlocking position. Since the rod 12 contacts the protrusion 81 to regulate movement in the rotational direction when the rod 12 moves in the protruding direction, the cylinder 11 and the rod 12 are in a predetermined unlocked state. It can be conveyed to the operator by the change of a feeling of operation which became a 2nd relative rotation position. 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 expansion portion 86 which is provided spaced apart from the maximum length contact portion 115 in the axial direction, respectively, and the lock portion 100 is provided. And guide portions 101 are formed on one side and the other side of the same extension portion 87, respectively, and the lock portion 105 and guide portions 106, 107 are on the one side and the other side of the same extension portion 88, respectively. Since it is formed, the number of extension parts can be reduced, and weight reduction and cost reduction can be aimed at.

In addition, since the lock portions 95, 100, 105 are wider than the diameters of the projections 81, respectively, the rods 12 can be well regulated so as not to move in the reduction direction.

In addition, since the surface facing the maximum length contact portion 115 of the lock portions 95, 100, 105 is the concave surface 95a, 100a, 105a, the rod 12 may be well regulated so as not to move in the reduction direction. Can be.

Moreover, when looking at the positioning part 121 in the external appearance of the cylinder 11, since it can be confirmed that the projection 81 is in the lock position which opposes the lock part 95 and the rod axial direction, the projection 81 ) Can be easily and surely recognized by the operator that is in the lock position opposite to the lock portion 95 and the rod axial direction. Therefore, the convenience and safety of use can be further improved.

Moreover, since the cam mechanism 120 can be incorporated in the cylinder 11, it becomes the same appearance as the conventional gas spring, and can miniaturize the whole.

Moreover, since the protrusion 81 is comprised so that the pin 83 may be rotatably loosely fitted with respect to the fitting hole 82, when the protrusion 81 moves in contact with the maximum length contact part 115, the protrusion 81 will be carried out. The frictional resistance can be reduced by rotating (rotating) temporarily. Therefore, the rotational torque required for the lock release operation can be further reduced, and the operability of the lock release operation can be further improved.

&Quot; Second Embodiment "

Next, 2nd Embodiment which concerns on this invention is described mainly based on the difference part with 1st Embodiment based on FIG. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol and the same code | symbol.

In the second embodiment, the protrusions 130 and 131 projecting from the flat portion 91 between the flat portion 91 which is the lockable position in the rod circumferential direction and the release position recessed portion 92 which is the unlocking position are provided. Formed. These protruding portions 130 and 131 have a semicircular cross section with a thin end, and the protrusions 81 move from the flat portion 91 to the release position concave portion 92 in the circumferential direction along the maximum length contact portion 115. When you move, you can ride over.

In the second embodiment, when the rod 12 is moved to the extension side (upper side in FIG. 4) to protrude from the cylinder 11, as in the first embodiment, the rod 12 is an induction part 96, 101, 106. , 107, 111 guides the projection 81, that is, the cylinder 11, by relative guidance, and finally, at the lock position concave surface 93a of the extension 85 to the projection 81. It comes into contact with the cylinder 11 in the locked state located at the first relative rotational position (for example, see A1 to A4).

And when the cylinder 11 turns into the predetermined 2nd relative rotation position which rotates with respect to the rod 12, and becomes the unlocked state, the projection 81 integrally rotating with the cylinder 11 will be a flat surface. After traveling on the 9191a, the vehicle passes over any one of the protrusions 130 and 131 against the gas reaction force and enters the release position concave surface 92a. For example, the projection 81 travels on the flat surface 91a as shown by A5 in FIG. 4, and then rides over the protrusion 131 against the gas reaction force as shown by B5. As shown in FIG. 2, it enters the release position concave surface 92a.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 to the reduction side from this unlocked state, the rod 12, as in the first embodiment, is formed on the surface of the expansion portion 86 and the other portions of the expansion portion 87 ( After passing the protrusion 81 between 97a and 102a, the protrusion 81 contacts the protrusion 81 at the inclined surface 110a of the expansion portion 89 so that the protrusion 81 is brought close to the expansion portion 88 by the inclination thereof. After the cylinder 11 is rotated relative to each other, the cylinder 11 is further allowed to move in the reduction direction (see, for example, A6 to A9).

According to the above second embodiment, the protrusions 130 and 131 protruding from the flat portion 91 between the flat portion 91 which is the lockable position in the rod circumferential direction and the release position concave portion 92 which is the unlocking position. Is formed, the protrusions 130 and 131 and the release position recess 92 restrict movement of the protrusion 81 in the circumferential direction of the rod, that is, relative rotation of the cylinder 11 with respect to the rod 12. Done. Therefore, the cylinder 11 with respect to the rod 12 has become a predetermined 2nd relative rotational position which becomes an unlocked state, and it can convey to an operator favorable with a change of a feeling of operation. Therefore, usability can be further improved.

&Quot; Third Embodiment "

Next, the third embodiment according to the present invention will be mainly described based on the difference from the first embodiment based on FIG. 5. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol and the same code | symbol.

In 3rd Embodiment, the shape of the largest length contact part 115 of the expansion part 85 differs from 1st Embodiment. The maximum length contact part 115 of 3rd Embodiment is the opening side of the lock position recessed surface 93a similar to 1st Embodiment, and the bottom side of the release position recessed surface 92a, and another set of release position recessed surface 92a. Inclined surfaces 135a and 136a are formed in place of the flat surface 91a of the first embodiment so as to be connected to each other. The inclined surface 135a connects the lock position concave surface 93a and the release position concave surface 92a, and the inclined surface 136a connects the lock position concave surface 93a and another set of release position concave surfaces 92a, In either case, the lock position concave surface 93a side is inclined so as to be positioned on the extension side (upper side in FIG. 5) in the rod axial direction. Therefore, the maximum length contact part 115 of 3rd Embodiment is the release position recessed part 92 containing the release position recessed surface 92a, and the lock position recessed part 93 containing the lock position recessed surface 93a. ), An inclined portion 135 including an inclined surface 135a, and an inclined portion 136 including an inclined surface 136a.

In the maximum length contact portion 115 of the third embodiment, the positions of the inclined surfaces 135a, 136a and the lock position concave surface 93a, which are the ranges in the circumferential direction facing the lock portions 95, 100, 105 described above, When the projection 81 is located in this range, the rod 12 is in a lockable position in which the rod 12 cannot move in the reduction direction (downward in FIG. 5), and faces the lock portions 95, 100, and 105. The position of the release position recessed surface 92a which is the range of the circumferential direction which does not, and the position of the inclined surfaces 135a and 136a in the vicinity become movable in the reduction direction when the projection 81 is located in this range. It is in the unlocked position.

In the third embodiment, when the rod 12 is moved to the extension side (upper side in Fig. 5) to protrude from the cylinder 11, as in the first embodiment, the rod 12 is formed of the guide portions 96, 101, 106, The projection 81 and the cylinder 11 are rotated relative to each other by the guidance of any one of 107 and 111, and finally the projection 81 is brought into contact with the projection 81 at the lock position concave surface 93a of the expansion portion 85. It will be in the locked state located in the 1st relative rotation position with respect to the cylinder 11 (for example, refer to A1-A4).

When the cylinder 11 is rotated relative to the rod 12 from the locked state in the first relative rotational position to a predetermined second relative rotational position, the protrusion 81 integrally rotating with the cylinder 11 is It initially moves slightly against the gas reaction force and bounces from the lock position concave surface 93a to one of the inclined surfaces 135a and 136a to travel either of the inclined surfaces 135a and 136a. Here, when the projection 81 is moved 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 axial direction is a rod to which gas reaction force is applied ( 12), the operating force required for relative rotation is further reduced.

Then, when the cylinder 11 is at the predetermined second relative rotational position with respect to the rod 12, the projection 81 enters the release position concave surface 92a by gas reaction force and becomes in the unlocked state in contact with it. By doing so, the release position concave surface 92a and the inclined surfaces 135a and 136a on both sides restrict the movement of the projection 81 in the circumferential direction of the rod. For example, as shown in FIG. 5, the projection 81 is thrown up from the lock position concave surface 93a as shown by A4 to the inclined surface 135a as shown by C5, and the inclined surface 135a. ) And enters the release position concave surface 92a as shown by A6.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 to the reduction side (lower side in Fig. 5) from the unlock state, the rod 12 expands the expansion portion 86 and another pair as in the first embodiment. After passing the projection 81 between the surfaces 97a and 102a of the portion 87, the projection 81 is contacted with the projection 81 on the inclined surface 110a of the expansion portion 89 and the expansion portion 88 is extended. After relatively rotating the cylinder 11 so as to approximate < RTI ID = 0.0 >

According to this third embodiment, since the lockable position of the maximum length contact portion 115 is directed toward the unlocking position side, the protrusions 81 are guided by the inclined portions 135 and 136 positioned in the propulsion direction of the gas reaction force. The operability of the lock release operation can be further improved.

"4th embodiment"

Next, 4th Embodiment which concerns on this invention is described mainly based on the difference part with 1st Embodiment based on FIG. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol and the same code | symbol.

In the fourth embodiment, the expansion portion 89 is longer in the rod circumferential direction than in the first embodiment, and as a result, the distance between the expansion portion 86 and the other pair of expansion portions 87 is widened. . In addition, in 4th Embodiment, the shape of the largest length contact part 115 of the expansion part 85 differs from 1st Embodiment.

That is, the expansion part 85 of 4th Embodiment does not have the lock position recessed surface 93a and the release position recessed surface 92a of 1st Embodiment, and centers the expansion part 89 in a rod circumferential direction. At the same position as the above, a protrusion 140 is formed which protrudes from the flat surface 91a of the flat portion 91 in an end shape. Surfaces 140a and 140b on both sides of the rod circumferential direction of the protrusion 140 are formed in a curved concave shape having the same diameter as that of the protrusion 81.

Here, when the projection 81 is in contact with either the flat surface 91a or one of the surfaces 140a and 140b of the projection 140 at the same time, the projection (in the rod circumferential direction of the projection 81) The expansion portion 86 is formed at a position farther from the protruding portion 140 than the end position opposite to the 140. The maximum length contact part 115 consists of the flat part 91 and the protrusion part 140, and the range of the circumferential direction which opposes the lock parts 95, 100, 105 among this flat surface 91a falls in this range. When the protrusion 81 is positioned, the rod 12 is in a lockable position in which the rod 12 cannot move in the reduction direction, and the protrusions (not facing the lock portions 95, 100, 105) in the flat surface 91a ( The vicinity range of 140 is set to the unlocking position which the rod 12 can move to a reduction direction (down direction of FIG. 6) when the projection 81 is located in this range.

In the fourth embodiment, when the rod 12 is moved to the extension side (upper side in FIG. 6) to protrude from the cylinder 11, as in the first embodiment, the rod 12 is an induction part 96, 101, 106. , The projections 81 and the cylinders 11 are rotated relative to each other by the guidance of any one of 107 and 111, and finally the cylinders are brought into contact with the projections 81 on the flat surface 91a of the extension 85. It will be in the locked state located in 1st relative rotation position with respect to (11) (for example, refer to A1-A3, D4). In this locked state, the relative rotation of the rod 12 and the cylinder 11 is regulated by the frictional force caused by the gas reaction force generated between the protrusion 81 and the flat portion 91. Also in this case, even if the cylinder 11 may rotate somewhat relative to the rod 12, the concave surface 95a of the expansion portion 86 or the concave surface 100a of the expansion portion 87 is a projection ( 81, the movement of the further rod 12 in the reduction direction is regulated.

From the locked state in the first relative rotational position, when the cylinder 11 is relatively rotated relative to the rod 12 to become a predetermined second relative rotational position different from the first relative rotational position, in the entire range of relative rotation The protrusion 81 runs on the flat surface 91a. Therefore, it is not necessary to move the projection 81 against the gas reaction force in the whole range of the relative rotation, and the operation force required for the relative rotation is reduced. Then, when the predetermined second relative rotational position is reached, the protrusion 81 is in the unlocked state in contact with the protrusion 140. At this time, the relative rotation of the cylinder 11 with respect to the rod 12 is controlled by the frictional force by the gas reaction force generated between the protrusion 81 and the flat part 91. For example, as shown in FIG. 6, the projection 81 in the position shown by D4 travels on the flat surface 91a of the rod 12, as shown by D5, and the protrusion part as shown by D6. It contacts the surface 140b of 140.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 to the reduction side (lower side in Fig. 6) from the unlocked state, the rod 12 expands the expansion portion 86 and another pair as shown by D7. After passing the projection 81 between the surfaces 97a and 102a of the portion 87, the projection 81 is contacted with the projection 81 on the inclined surface 110a of the expansion portion 89 and the expansion portion 88 is extended. After relatively rotating the cylinder 11 so as to approximate), as shown by D8 and D9, further movement in the reduction direction is allowed.

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

In the first to fourth embodiments, the projections 81 are provided on the cylinder side member 79 provided separately to the cylinder 11, while the expansion portions 85 to 89 are directly provided on the rod 12, A separate rod side member having the extending portions 85 to 89 may be provided on the rod 12 and the projections 81 may be provided directly on the cylinder 11. In this case, So as to have a function as a cylinder side member. Contrary to the above, the projection 81 may be provided on the rod side member including the rod 12, and the expansion portions 85 to 89 may be provided on the cylinder side member including the cylinder 11.

"Fifth Embodiment"

Next, 5th Embodiment which concerns on this invention is described mainly based on the difference part with 1st Embodiment based on FIG. 3 and FIG. In addition, about the site | part common in 1st embodiment, it shows with the same code | symbol 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 generally covered cylindrical dust cover body 243 having a tubular portion 241 and a lid portion 242 for closing one end thereof, and at the center of the lid portion 242. It is rotatably supported by the rod 12. The dust cover 240 is provided so that relative rotation is possible with respect to the rod 12 and the cylinder 11 in the state which the movement of the axial direction with respect to the rod 12 is restricted.

The dust cover main body 243 has an inner side protruding portion 245, 246 at two positions in an annular shape having a smaller diameter than the main body portion 244 of the other constant diameter on the side opposite to the lid portion 242 of the cylindrical portion 241. It is formed coaxially by plastic working. Moreover, the dust cover main body 243 is provided with the some convex convex part 247 which protrudes radially inward at the position between two inner protrusion part 245,246.

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

In addition, inside the tubular portion 241 of the dust cover body 243, five types of expansion portions 85, 86, 87, 88, and 89 as in the first embodiment are provided in two sets and the rod circumferential direction (Fig. 3). The phases of 180 degrees in the right and left directions are formed in the same manner. The inner circumferential member 82 is sandwiched between both inner protruding portions 245 and 246 of the dust cover main body 243, and the locking convex portion 247 enters the locking recess 83 of the outer circumferential surface. As a result, the inner circumferential member 82 is restricted from moving 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 projection 81 and the expansion portions 85, 86, 87, 88, 89 are provided between the cylinder 11 and the dust cover 240. As a result, no mechanism is provided between the cylinder 11 and the rod 12 in the cylinder 11.

The cylinder 11 and the dust cover 240 are provided with the same positioning unit as in the first embodiment, which can visually confirm that the projection 81 is in the locked position. The positioning unit includes a triangular mark 122 formed on the body portion 20 of the cylinder 11 so as to face the dust cover 240 along the cylinder axial direction, and the cylindrical portion 241 of the dust cover 240. In addition, it consists of a triangular mark 123 formed facing the cylinder 11 along the cylinder axial direction. That is, this positioning part can confirm that the projection 81 is in the lock position which opposes a cylinder axial direction from the external appearance of the dust cover 140. As shown in FIG.

The effect | action by the above structure is the same as that of said each embodiment. Moreover, in the said 5th Embodiment, the example in which the protrusion 81 was provided directly in the cylinder 11 and the expansion part 85, 86, 87, 88, 89 was provided in the inner periphery of the dust cover 240 is shown. However, the projections 81 may be provided in the dust cover 240, and expansion portions 85, 86, 87, 88, and 89 may be provided in the cylinder 11. As in the second to fourth embodiments, the shapes of the extended portions 85, 86, 87, 88, 89 and the maximum length contact portion 115 may be changed as appropriate.

The above-mentioned 1st-5th embodiment is a cylinder apparatus which has a cylindrical cylinder and the rod which the one end is inserted in the one end of this cylinder, presses in a protrusion direction, and is rotatable with respect to the said cylinder, The said cylinder A cylinder side member provided with restricted movement in at least axial direction with respect to the rod, and a rod side member provided with restricted movement in at least axial direction with respect to the rod so as to be rotatable relative to the peripheral surface of the cylinder side member or the rod. A projection provided on either one of the peripheral surfaces of the side members and extending in the radial direction, and provided on the other of the peripheral surfaces of the cylinder-side member or the peripheral surfaces of the rod-side members facing the peripheral surfaces on which the projections are provided, A maximum length contact portion extending in the circumferential direction in which the projection is in contact when the rod is in a maximum protruding state, and the maximum A lock portion which is partially provided in the circumferential direction so as to face the contact portion in the axial direction, and which restricts the projection from contacting at the time of length reduction and no further movement of the rod in the reduction direction; And a guide portion spaced apart from the maximum length contact portion in the axial direction so as to guide the protrusion to a position opposite the lock portion in the circumferential direction of the maximum length contact portion when the projection is a. Accordingly, when the rod is in the maximum protruding state, the guide portion provided to be spaced axially from the maximum length contact portion guides the projection to a position facing the lock portion in the circumferential direction of the maximum length contact portion, so that the lock portion It is regulated not to move in the reduction direction. In this way, the guide and the induction part spaced apart from the maximum length contact portion are guided to the position opposite to the lock portion in the circumferential direction of the maximum length contact portion, so that the rod and the cylinder are largely opposed to the gas reaction force when the lock is released. No need to move relative. Therefore, the operability of the lock release operation can be improved.

Further, in the first to fifth embodiments, the lockable position where the rod is not movable in the reduction direction when the maximum length contact portion has a range in the circumferential direction facing the lock portion is located in this range. In addition, the range of the circumferential direction which does not oppose the said lock part is a lock release position which the said rod can move to a reduction direction, when the said projection is located in this range. Thus, the range of the circumferential direction which opposes a lock part among the largest length contact parts extended in a circumferential direction is a lockable position which a rod becomes impossible to move to a reduction direction when a projection is located in this range, Since the non-facing circumferential range is a lock release position in which the rod is movable in the reduction direction when the projection is located in this range, the lock is locked from the lockable position along the maximum length contact extending in the circumferential direction when unlocking. Move the projection to the release position. Therefore, the operability of a lock release operation can be improved more.

Moreover, the 4th embodiment is characterized in that the lockable position of the maximum length contact portion is flat. Accordingly, the projection may be moved from the flat lockable position to the lock release position at the time of unlocking. Therefore, the operability of a lock release operation can be improved more.

Moreover, the 1st-5th embodiment is characterized by the recessed part by which the said projection fits in the said lock release position of the said largest length contact part, It is characterized by the above-mentioned. Thereby, since the projection located at the unlocking position of the maximum length contact portion is fitted into the recessed portion, it is possible to give an accent to the operating force, and to let the operator recognize the position located at the unlocking position.

Moreover, 2nd Embodiment is provided between the lockable position and the said lock release position in the circumferential direction, The protrusion which can ride over when the said protrusion moves to the circumferential direction along the said largest length contact part is provided, It is characterized by the above-mentioned. do. As a result, when the projection moves from the lockable position to the unlocking position, the projection overtakes the projection so that the operation force can be further accented, and the operator can be recognized that it is located in the unlocking position.

Moreover, the 1st-5th embodiment is characterized in that the said lock part and the said guide part are formed in the one side and the other side, respectively, provided in the axial direction spaced apart from the said largest length contact part. In this way, since the lock portion and the induction portion are formed on one side and the other side of the expansion portion which are provided spaced apart from the maximum length contact portion in the axial direction, the number of the expansion portions can be reduced, and the weight and cost can be reduced. .

Moreover, the 1st-5th embodiment is characterized in that the said lock part is wider than the diameter of the said processus | protrusion. In this way, since the lock portion is wider than the diameter of the projection, it can be satisfactorily regulated so that the rod does not move in the reduction direction.

Moreover, the 1st-5th embodiment is characterized in that the surface in which the said lock part opposes the said maximum length contact part is formed in the concave surface. Thus, since the surface opposing the maximum length contact portion of the lock portion is formed as a concave surface, it can be satisfactorily regulated so that the rod does not move in the reduction direction.

In the above first to fifth embodiments, the case where the force is applied to the rod 12 in the protruding direction by the gas pressure in the cylinder has been described, but the rod ( 12) may be pressed in the protruding direction.

In addition, in the above-mentioned 1st-5th embodiment, although the opening-and-closing member opened | released by gas reaction force, the movement to the opening direction is according to the weight of the opening-and-closing member, the gas reaction force, and the mounting method of a cylinder device. In the case of moving only by the gas reaction force of the cylinder apparatus, and the weight of the opening / closing member may be assisted by the gas reaction force of the cylinder apparatus, and it may be moved by the operator's force, and the cylinder apparatus of this embodiment is applicable to both cases. .

In the first to fifth embodiments described above, it was shown that gas and a small amount of oil liquid are mixed in the cylinder. However, the present invention is not limited to this, and the pre-piston is provided in the chamber on the lower side in the cylinder, and the lower side thereof. The gas may be sealed in the oil and the oil liquid may be sealed in the rod side. With this configuration, it is possible to install the rod protruding side with the vertical upper side always.

In addition, in the said 1st-5th embodiment, although the flow path hole 64 was shown to always be open, it is not limited to this, In the piston 13, the annular flexibility is shown in the upper surface of FIG. And an annular metal disk valve and a fixed orifice having a small flow passage area which is always in communication with each other. As a result, when the rod 12 is reduced, operation with a small force is possible, and when expanding, the stretching speed can be adjusted to the area of the fixed orifice.

Moreover, in the said 1st-5th embodiment, although the rod 12 was fixed and the cylinder 11 side was rotatable, it is not limited to this, The rod 12 side and the cylinder 11 are The relative rotation may be performed, and the rod 12 may be rotatably installed with respect to the mounting bracket 73, and the mounting bracket 32 may be fixed to the cylinder 11. In other words, if the cylinder-side member (which may be rotated relative to the cylinder) and the rod-side member (which may be rotated relative to the rod) fixed to the cylinder and the axial direction are relatively rotated, good.

11: Cylinder
12: rod (rod side member)
79: cylinder side member
81: turning
85 to 89: extension part
91: flat part
92: release position recessed part (concave part)
95, 100, 105: lock section
95a, 100a, 105a: concave
96, 101, 106, 107, 111, 112: induction part
115: maximum length of contact
130, 131: protrusions

Claims (9)

Cylindrical cylinder,
One end is inserted into one end of the cylinder, is pushed in the protruding direction and the rod rotatable relative to the cylinder
A cylinder device comprising:
A cylinder side member provided with restricted movement in at least an axial direction with respect to the cylinder, and a rod side member provided with restricted movement in at least an axial direction with respect to the rod,
A projection which is provided on either the peripheral surface of the cylinder side member or the peripheral surface of the rod side member and extends in the radial direction,
It is provided on the other of the circumferential surface of the said cylinder side member or the circumferential surface of the rod side member which opposes the circumferential surface in which the said processus | protrusion was provided, and extends in the circumferential direction which the said protrusion contacts when the rod becomes a maximum protrusion state. With maximum length contact,
A lock part which is partially installed in the circumferential direction so as to face the maximum length contact part in the axial direction, and which the projection contacts at the time of length reduction and restricts the rod from moving further in the reduction direction;
And a guide portion spaced apart from the maximum length contact portion in the axial direction so as to guide the protrusion to a position facing the lock portion in the circumferential direction of the maximum length contact portion when the rod is in the maximum protruding state. Cylinder device. The said maximum length contact part is a lockable position in which the range of the circumferential direction which opposes the said lock part is not movable in a reduction direction when the said projection is located in this range, The said lock part And a range in the circumferential direction not opposed to the lock release position in which the rod is movable in the reduction direction when the projection is located in this range. The cylinder device according to claim 2, wherein the lockable position of the maximum length contact portion is flat. The cylinder device according to claim 2, wherein the lock release position of the maximum length contact portion is provided with a recess to which the projection is fitted. 4. The cylinder device according to claim 3, wherein a recess in which the protrusion is fitted is provided at the lock release position of the maximum length contact portion. 3. A cylinder according to claim 2, wherein a protrusion is provided between the lockable position and the unlocking position in the circumferential direction so that the projection can be carried over when the protrusion moves in the circumferential direction along the maximum length contact portion. Device. 2. The cylinder device according to claim 1, wherein the lock portion and the guide portion are formed on one side and the other side of the expansion portion, which are spaced apart from the maximum length contact portion in the axial direction. The cylinder device according to claim 1, wherein the lock portion is wider than a diameter of the protrusion. The cylinder device according to claim 1, wherein the lock portion is formed with a concave surface that faces the maximum length contact portion.

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