KR101333385B1 - Cylinder apparatus - Google Patents

Abstract

This invention makes it a subject to provide the cylinder apparatus which can improve usability.
The cylinder device of the present invention is provided on either one of the inner circumferential surface of the cylinder and the outer circumferential surface of the rod, and is provided on the other of the projection 81 extending in the radial direction and the outer circumferential surface of the cylinder and the rod so that the rod is in the maximum protruding state. At this time, the inclined portions 91 and 93 which contact the projection 81 to rotate the cylinder relative to the rod and lead to a predetermined relative rotational position, and the other one of the inner circumferential surface of the cylinder and the outer circumferential surface of the rod, When the cylinder and the rod are in a predetermined relative rotational position in the maximum protruding state, the lock is held in contact with the protrusion 81 to hold the protrusion 81 when the rod moves in the insertion direction by opposing the protrusion 81 in the axial direction. It has a portion 87.

Description

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).

Moreover, when a rod is made to protrude near a maximum length from a cylinder, and a cylinder is rotated, there exists a lock state which regulates the movement of a rod in the insertion direction to a cylinder (for example, refer patent document 2).

Moreover, when the rod protrudes from the cylinder to the vicinity of the maximum length, the dust cover may be in a locked state in which the dust cover is tilted to automatically regulate the movement of the rod in the insertion direction (see Patent Document 3, for example).

Japanese Patent Laid-Open No. 50-54775 Published Japanese Utility Model Public Pyung Hwa 06-87742 Japanese Patent Publication No. 56-14636

The conventional cylinder device has a problem that the usability is not good.

Therefore, an object of this invention is to provide the cylinder apparatus which can improve usability.

In order to achieve the above object, the cylinder device of the present invention is a cylinder device including a cylindrical cylinder and a rod which is inserted to protrude from one end of the cylinder and is pushed in the protruding direction, the cylinder device including at least relative to the cylinder. A cylinder-side member provided with restricted movement in the axial direction, and a rod-side member provided with controlled movement in at least the axial direction with respect to the rod so as to be relatively rotatable, and the peripheral surface of the cylindrical member or the rod-side member A protrusion provided in one of the circumferential surfaces and extending in the radial direction, and provided on the other of the circumferential surface of the cylinder-side member or the circumferential surface of the rod-side member facing the circumferential surface on which the projection is provided, and the rod protrudes at the maximum. When it is going to be in a state, the rod-side portion is brought into contact with the projection and the cylinder-side member An inclined portion which is rotated relative to and guided to a predetermined relative rotational position, and a circumferential surface provided with the inclined portion, wherein the cylinder-side member and the rod-side member are in the predetermined relative rotational position in the state of maximum protrusion of the rod. When the rod is opposed to the protrusion in the axial direction, the rod is in contact with the protrusion to hold the protrusion when the rod moves in the insertion direction, and has a lock portion for restricting the movement of the rod in the insertion direction.

According to the present invention, usability 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 a developed view showing the relationship between the cam portion and the projections of the cylinder devices of the first to fourth embodiments according to the present invention.
4 is a developed view of a modification showing the relationship between the cam portion and the projections of the cylinder devices of the first to fourth embodiments according to the present invention.
Fig. 5 is a partially enlarged front sectional view showing the cylinder device of the second embodiment according to the present invention.
Fig. 6 is a partially enlarged front sectional view showing the cylinder device of the third embodiment according to the present invention.
7 is a partially enlarged front sectional view showing the cylinder device of the fourth embodiment according to the present invention.

"First embodiment"

1st Embodiment which concerns on this invention is described based on FIGS.

Fig. 1 shows a cylinder device of the first embodiment, which is a gas reservoir 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 is inserted from one end of the cylinder 11, and a rod. It has the piston 13 fixed to the end arrange | positioned in the cylinder 11 of (12). The piston 13 is fitted in the cylinder 11 so as to be slidable, and the piston 13 allows the inside of the cylinder 11 to have a seal 14 on the rod 12 side and a seal on the lower side ( It is divided into two rooms of 15).

The cylinder 11 has a substantially bottomed cylindrical shape having an approximately cylindrical body 20 and a bottom 21 fixed to close one end (lower side) of the body 20. It has a cylinder main body 22. 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 on the side 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 step portion 26 for plastic working. It is formed coaxially. In addition, the cylinder main body 22 is provided with the some convex convex part 29 which protrudes radially inward in the position between two inner protrusion parts 27 and 28. As shown in FIG.

On the other hand, each of the inner protrusions 27 and 28 may have a plurality of projections in the circumferential direction.

The cylinder 11 has a screw member 31 fixed to the bottom 21 of the cylinder body 22 so as to protrude outward in the axial direction, and the mounting bracket 32 is attached to the screw member 31. It is rotatably mounted. The mounting bracket 32 has a mounting plate portion 34 with a mounting hole 33 formed therein, and a holding plate portion 35 standing upright at one end of the mounting plate portion 34. The holding plate portion 35 has An insertion hole 36 through which the screw member 31 is inserted is formed. From the bottom 21 side of the cylinder main body 22, the bearing 38, the holding plate part 35 of the mounting bracket 32, and the bearing 39 are arrange | positioned in order so that the screw member 31 may be penetrated. The nut 40 is screwed to the screw member 31 so as to sandwich them with the bottom portion 21. The mounting bracket 32 is attached to the cylinder 11 in a state where the mounting plate portion 34 is disposed on the side opposite to the bottom portion 21 of the holding plate portion 35.

On the other hand, although the bearings 38 and 39 show a ball bearing, the mounting bracket 32 should just be rotatable with respect to the cylinder main body 22, and may be a sliding bearing, such as resin.

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

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 sliding bearing. On the outer diameter side of the rod guide 45, a large diameter portion 51 having the largest diameter is formed at one end in the axial direction, and an intermediate diameter portion 52 having a diameter smaller than the large diameter portion 51 is formed at the middle in the axial direction. At the other end in the direction, a stepped cylindrical shape is formed in which a small diameter portion 53 having a diameter smaller than the middle diameter portion 52 is formed.

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. As for the elastic member 57, the annular groove part 58 is formed in the one end side of an axial direction, and the radial cross section is C-shaped. The rigid member 56 is embedded in the outer diameter side of 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 holding ring 47 is disposed in the main body 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. And the rod guide 45 is arrange | positioned at the opening part 23 side of this seal ring 46, making the large diameter part 51 the seal ring 46 side. The large diameter portion 51 of the rod guide 45 is hung on the annular step portion 26 of the cylinder 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. On the other hand, when the seal ring 46 can be held on the rod projecting end side by the internal pressure, the retaining ring 47 is unnecessary.

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

The rod 12 includes a main shaft portion 68 having a constant diameter, a fitting shaft portion 69 having a smaller diameter than the main shaft portion 68 provided on one end side of the main shaft portion 68, and a main shaft of the fitting shaft portion 69. It has the caulking part 70 formed in large diameter by plastically deforming the fitting shaft part 69 on the opposite side to the 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 be accommodated in the placement recess 63, and the caulking portion 70 is formed. The piston 13 is clamped by the caulking portion 70 and the main shaft portion 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 The gap between the main shaft portion 68 of the rod 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 inside the cylinder body 22 inwardly so as to be rotatable and axially moveable, so that the rod 12 is fitted. The cylinder 11 is rotatable relative to the cylinder 11 and axially movable. On the other hand, it is preferable to resin-process the outer peripheral surface of the piston 13, and you may provide a seal.

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

As shown in FIG. 2, in the first shaft portion 68 of the rod 12, a plurality of protrusions 81 extending along the radial direction of the rod 12 from the outer circumferential surface thereof, specifically, Two are formed in 180 degree different positions. These protrusions 81 form a columnar shape along the radial direction of the rod 12. These projections 81 form a fitting hole along the radial direction in the main shaft portion 68 of the rod 12, for example, and press-fits the cylindrical pin so that both ends thereof protrude from the rod 12. As a result, both ends of the pin are formed. In this embodiment, the rod 12 itself constitutes the rod side member of the present invention.

The protrusion 81 is arranged between the piston 13 and the retaining ring 47, and at this position in the cylinder main body 22, an inner circumference of a substantially cylindrical metal constituting a part of the cylinder 11. The member 82 is fixed. This inner peripheral member 82 constitutes the cylinder side member of the present invention.

The inner circumferential member 82 is fitted to the main body 25 of the cylinder main body 22 in a state where the inner circumferential member 82 is sandwiched by the inner protrusions 27 and 28 on both sides of the cylinder main body 22, whereby the cylinder main body 22 is fitted. It is regulated not to move in the axial direction with respect to. In addition, the inner peripheral member 82 is provided with a plurality of locking recesses 83 recessed in the radial direction at the center position in the axial direction of the outer circumferential surface, and the locking convex portions of the cylinder body 22 are formed in these locking recesses 83. Rotation with respect to the cylinder main body 22 is restrict | limited as each part 29 enters.

On the inner circumferential side of the inner circumferential member 82, as shown in FIG. 3, a set of cam portions 86, lock portions 87, and restricting portions 88 that contact and guide the outer circumferential surface of the projections 81 are all provided. Two sets are formed. Two cams 86 of the same shape which are arrange | positioned at one side of the cylinder axial direction (up-down direction of FIG. 3) are formed adjacent to each other so that it may continue in a cylinder circumferential direction (left-right direction of FIG. 3). In addition, one jaw of the lock portion 87 and the restricting portion 88 disposed on the other side in the cylinder axial direction is formed to be spaced apart from each other in the cylinder circumferential direction and to match the position of the cam portion 86 with the cylinder circumferential direction. The other jaws of the lock portion 87 and the restricting portion 88 are spaced apart from each other in the cylinder circumferential direction and are formed so as to match the position of the other cam portion 86 with the cylinder circumferential direction.

In the first embodiment, the cam portion 86 is disposed on the opening 23 side of the cylinder 11, that is, on the protruding side from the cylinder 11 of the rod 12, and the lock portion 87 and the restricting portion ( 88 is arrange | positioned on the opposite side (lower side) to the opening part 23 of the cylinder 11, ie, the insertion side to the cylinder 11 of the rod 12. As shown in FIG.

The cam portion 86 includes an inclined portion 91 that is inclined so as to be located on one side of the cylinder axial direction (upper side in FIG. 3, hereinafter same in FIG. 3) by one side of the cylinder circumferential direction (right side in FIG. 3. ) Is recessed in an arc shape on one side of the cylinder in the circumferential direction, and one cylinder side in the cylinder circumferential direction on the other side of the cylinder An inclined portion 93 inclined so as to be positioned, a convex portion 94 protruding in an arc shape on the other side of the cylinder axial direction continuously to one side of the cylinder circumferential direction of the inclined portion 93, and a cylinder of the convex portion 94 A concave portion 95 that is recessed in an arc shape on one side of the cylinder axial direction continuously on one side in the circumferential direction, and a convex portion which protrudes in an arc shape on the other side of the cylinder axial direction continuously on one side of the cylinder circumferential direction of the concave portion ( 96). The inclined portion 91 of the other cam portion 86 is continuous on one side of the circumferential direction of the convex portion 96.

The inclination part 91 and the inclination part 93 are equal in angle with respect to the cylinder axial direction, and the height in the cylinder axial direction is also equal. Therefore, the inclination part 91, the recessed part 92, and the whole inclination part 93 are line symmetrical with respect to the line along the cylinder axial direction passing through the center of the recessed part 92. As shown in FIG. Moreover, the convex parts 94 and 96 are formed in the same position in the cylinder axial direction, and comprise the arc shape of the same diameter, Therefore, the convex part 94, the recessed part 95, and the whole convex part 96 are concave. A line symmetry is formed with respect to the line along the cylinder axial direction passing through the center of the part 95. Here, the recesses 92 and 95 form an arc of a larger diameter than the diameter of the projection 81, and the phases of the recesses 92 and 95 are different from each other by 90 degrees in the circumferential direction of the cylinder.

When the inclined portions 91 and 93 of the cam portion 86 are in contact with the protrusion 81 when the rod 12 is in the maximum protruding state most protruding from the cylinder 11, the inclined portions 91 and 93 contact the protrusion 81 with the concave portion ( 92, and the rod 12 and the cylinder 11 are rotated relative to each other. When the projection 81 is in the deepest position in contact with the bottom of the recess 92, the rod 12 is in the maximum protruding state, the rod 12 and the cylinder 11 is a predetermined first relative rotational position (Relative rotation position). That is, the inclined portions 91 and 93 of the cam portion 86 are provided on the inner circumferential surface of the cylinder 11, and when the rod 12 is in the maximum protruding state, the inclined portions 91 and 93 come into contact with the protrusions 81 to open the cylinder 11. It rotates relative to the rod 12 and guides it to a predetermined 1st relative rotation position.

In addition, when the rod 12 is relatively rotated with respect to the cylinder 11 in the state where the protrusion 81 is located in the recessed part 92, the protrusion 81 will move to any one of the recessed part 92 and the inclined surfaces 91 and 93. FIG. While being guided to one side, the concave portions 95 between the convex portions 94 and 96 of one of the cam portions 86 are opposed to each other in a circumferential direction. In this state, when the rod 12 moves in the protruding direction, the projection 81 enters the recess 95 and contacts the bottom thereof, whereby the recess 95 and the convex portions 94 and 96 It will be in the state which regulates the movement to the rotation direction of the projection 81. As shown in FIG. That is, the recessed part 95 and the convex parts 94 and 96 are formed in the inner peripheral surface of the cylinder 11, and the cylinder 11 and the rod 12 are predetermined | prescribed agent different from the said 1st relative rotation position. 2 when the rod 12 moves in the protruding direction by being opposed to the protrusion 81 in the relative rotational position, the lock release position defining portion that contacts the protrusion 81 and regulates movement in the rotational direction ( 97).

The lock portion 87 has an approximately isosceles triangle shape. The lock portion 87 has an inclined portion 101 which is inclined so as to be positioned at the other side of the cylinder axial direction by one side of the cylinder axial direction, and one side of the cylinder circumferential direction of the inclined portion 101 at the other side thereof. The inclined portion 102 is inclined so as to be located on one side of the cylinder axial direction by one side of the cylinder circumferential direction. Moreover, the lock part 87 is formed in the cylinder axial direction one side, and the recessed part 103 recessed in circular arc shape in the other cylinder axial direction side.

The inclination part 101 and the inclination part 102 are equal in angle with respect to the cylinder axial direction, and the height in the cylinder axial direction is also equal. Therefore, the inclination part 101 and the inclination part 102 have formed the line symmetrical shape with respect to the line along the cylinder axial direction which passes the angle part between them. Moreover, this angle part is made to match the position to the center of the recessed part 92 of the cam part 86 in a cylinder circumferential direction. The recessed part 103 has comprised the circular arc shape of larger diameter than the diameter of the projection 81, and coincides the center position with the recessed part 92 of the cam part 86 in the cylinder circumferential direction. Further, the recess 103 has a protrusion whose cylinder circumferential length is longer than the cylinder circumferential length of the recess 92 of the cam portion 86 and is located in the recess 92 of the cam portion 86 ( 81) and the cylinder circumferential position to face the cylinder axial direction.

Therefore, as for the recessed part 103 of the lock part 87, the protrusion 81 located in the recessed part 92 of the cam part 86 moves the cam part of the cylinder axial direction by the rod 12 moving to an insertion direction. When moving relatively to the opposite side to 86, the projection 81 is held in contact with the projection 81. As shown in FIG. In other words, the lock portion 87 provided on the inner circumferential surface of the cylinder 11 has a projection 81 when the cylinder 11 and the rod 12 are in the first relative rotational position in the state where the rod 12 protrudes. ), The rod 12 is in a locked state in contact with the projection 81 to hold the projection 81 when the rod 12 moves in the insertion direction.

Here, when the center of the projection 81 is in the range of the cylinder circumferential direction of the lock portion 87, the lock portion 87 restricts the reduction of the rod 12 near the maximum length. The protrusion 81 is guided to the center position in the circumferential direction where 103 is the deepest position. On the other hand, the lock portion 87 is unlocked to allow the rod 12 to move in the insertion direction near the maximum length and to be reduced if the center of the protrusion 81 is outside the range of the cylinder circumferential direction of the lock portion 87. It becomes a state. Therefore, at the relative rotational position of the cylinder 11 and the rod 12, the center of the projection 81 is within the range of the cylinder circumferential direction of the lock portion 87, and the rod 12 is regulated to decrease near the maximum length. The lock position to be made and the center of the protrusion 81 are outside the range of the cylinder circumferential direction of the lock part 87, and the lock release position which allows the rod 12 to reduce in the vicinity of the maximum length is provided, and the rod 12 Is extended to the maximum length, the inclined portions (automatic locking means) 91 and 93 of the cam portion 86 automatically rotate the relative rotation positions of the cylinder 11 and the rod 12 to the locked position.

The restricting portion 88 has a substantially parallelogram shape, and is formed on the concave portion 95 of the cam portion 86 to match the position in the cylinder circumferential direction. In the restricting portion 88, the inclined portion 108 inclined so as to be located at the other side of the cylinder axial direction by one cylinder circumferential direction, and the cylinder in the cylinder circumferential direction one side of the inclined portion 108 The inclined portion 109 is inclined so as to be positioned at one side in the axial direction of the cylinder by one side in the circumferential direction. The inclined portion 108 is longer than the inclined portion 109, and the angle formed by the line along the cylinder axial direction passing through the respective portions therebetween is larger than the inclined portion 109.

Further, the restricting portion 88 is inclined so as to be inclined so as to be located at one side in the cylinder axial direction, at one side in the cylinder axial direction, and at one side in the cylinder circumferential direction of the inclined portion 111. Thus, the inclined portion 112 is inclined so as to be positioned on the other side of the cylinder axial direction by one side of the cylinder circumferential direction. The inclination part 111 is shorter than the inclination part 112, and the angle formed with the line along the cylinder axial direction passing through each part between them is smaller than the inclination part 112 side. The inclination part 108 and the inclination part 112 are parallel, and the inclination part 109 and the inclination part 111 are parallel.

Although each part between the inclination parts 111 and 112 exists in the range of the recessed part 95 of the cam part 86 in a cylinder circumferential direction, it displaces the position of a cylinder circumferential direction with respect to the center of the recessed part 95. Formed. In the cylinder circumferential direction, the end portions of the inclined portions 108 and 111 side of the restricting portion 88 are on the opposite side to the concave portion 95 from the top of the one convex portion 94, and the inclined portion The edge part on the side of (109, 112) is in the opposite side to the recessed part 95 rather than the top part of the other convex part 96. As shown in FIG.

Therefore, the inclined portions 108 and 109 of the restricting portion 88 have the projections 81 on the opposite side of the cam portion 86 aligned with the concave portion 95 of the cam portion 86 in the cylinder circumferential direction. In the state, when moving to one side in the cylinder axial direction, the projection 81 is guided outward from the recess 95 of the cam portion 86 in the cylinder circumferential direction to restrict entry into the recess 95. On the other hand, the inclined portions 111 and 112 of the restricting portion 88 move on the other side in the cylinder axial direction while the protrusion 81 between the cam portion 86 is aligned with the position in the circumferential direction of the cylinder. In this case, the projection 81 is guided outward in the circumferential direction of the cylinder. On the other hand, when the projection 81 moves to the other side in the cylinder axial direction while being located at the bottom of the concave portion 95 of the cam portion 86, the protrusion 81 contacts the inclined portion 112 in which the position in the circumferential direction of the cylinder fits and guides it. It moves to one side of the cylinder circumferential direction.

The projection 81, the cam portion 86, the lock portion 87, and the restricting portion 88 constitute the cam mechanism 115, and the cam mechanism 115 includes the cylinder 11 in the cylinder 11. ) And the rod 12.

As shown in FIG. 1, projections 81 are formed on the bottom 21 side of the body portion 20 of the cylinder 11 and the mounting plate portion 34 of the mounting bracket 32 as described above. The position of the cylinder circumferential direction is matched with the recessed part 92 and the lock part 87 of the cam part 86, that is, the rod 12 and the cylinder 11 are located in a predetermined 1st relative rotational position, In other words, a positioning unit (positioning means) 118 is provided which makes it possible to visually confirm that the relative rotational position between the rod 12 and the cylinder 11 is in the locked position. The positioning unit 118 attaches the triangular mark 119 formed on the body portion 20 of the cylinder 11 to the mounting plate portion 34 along the cylinder axial direction, and the mounting bracket 32. The plate portion 34 is formed of a triangular mark 120 which is formed to face the body portion 20 along the cylinder axial direction.

And when these marks 119 and 120 match the position of a cylinder circumferential direction, and it becomes the state which opposes a cylinder axial direction, the projection 81 will be the recessed part 92 and the lock part 87 of the cam part 86. In a state in which the position in the circumferential direction of the cylinder is aligned, that is, in a state in which the rod 12 and the cylinder 11 are positioned at a predetermined first relative rotational position, in other words, the relative rotational position of the rod 12 and the cylinder 11 It is in the locked position. On the other hand, if these marks 119 and 120 displace the position in the cylinder circumferential direction, there is a possibility that the state will not be in the above state. In the mark 119 formed in the cylinder 11, the "LOCK" character which shows that the relative rotation position of the cylinder 11 and the rod 12 is in the locked position is provided.

On the other hand, when mounting to a mounting target, an operator mounts the mounting bracket 73 to one side of a mounting target, loosens the nut 40, and adjusts the mounting bracket 32 to the other side of a mounting target. To be mounted on the other side of the mounting target. Therefore, the rotation angle of the mounting bracket 32 with respect to the cylinder 11 is determined at this point in time. For this reason, the mark 120 of the mounting bracket 32 in a state where the mounting bracket 73 and the mounting bracket 32 are mounted to the mounting target and the rod 12 is in the maximum protruding state with the nut 40 loosened. ), The mark 119 of the cylinder 11 is preferably attached to the back. Therefore, the mark 119 of the cylinder 11 is made into the seal label which can be attached later. In contrast, the mark 120 of the mounting bracket 32 is formed by stamping.

In addition, although the example which described only the "LOCK" character was shown in the figure, you may make it display the lock release position used as the protrusion release position specification part 97.

Next, operation | movement of 1st Embodiment described above is demonstrated.

As for the cylinder apparatus, the mounting plate part 34 of the mounting bracket 32 attached to the cylinder 11, and the mounting plate part 75 of the mounting bracket 73 attached to the rod 12 are mounting holes 33 and 74. As a fastening member respectively penetrated through), it is attached to a base member (not shown) and an opening / closing member (not shown) that swings relative to the base member. In the case where the mounting direction is used for the normally closed opening and closing part, when the opening and closing member is closed, the mounting direction is preferably mounted such that the protruding side (upper side in the drawing) of the rod 12 of the cylinder device is located below. This is because it is suitable to ensure the sealing property and the sliding mobility as long as the oil liquid in the cylinder is in contact with the seal ring 46.

The rod 12 is most inserted into the cylinder 11 when the opening / closing member is in the closed state close to the base member, and the rod 12 is the cylinder when the opening / closing member is in the open state most spaced 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 is generated in the piston 13 by the difference of the hydraulic pressure area. Doing. Therefore, in the closed state, the opening / closing member is kept closed by exceeding the gas reaction force or by the locking mechanism not shown in relation to the base member.

At the time of swinging the opening / closing member, the piston 13 moves in the cylinder axial direction within the cylinder 11 to change the volume of the chambers 14 and 15, and at that time, The flow path hole 64 of the piston 13 controls the flow of gas to generate a damping force to suppress the swinging speed of the opening and closing member.

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 cam portion 86 in the cylinder axial direction relatively. At that time, the projection 81 has the inclined portion of the cam portion 86 when the relative position in the cylinder circumferential direction is twisted with respect to both the lock portion 87 and the restricting portion 88 (for example, a in FIG. 3). Direct contact with any of (91, 93) (e.g., b in FIG. 3), while the rod 12 and the cylinder 11 are rotated relative to each other by the guide, and relatively moved toward the cam portion 86 in the cylinder axial direction. The bottom of the recess 92 is brought into contact with the bottom of the recess 92 (for example, c of FIG. 3). In this state, the rod 12 is in the maximum protruding state most protruding from the cylinder 11, so that the rod 12 and the cylinder 11 are positioned at the first relative rotational position.

On the other hand, when the position in the cylinder circumferential direction of the protrusion 81 is matched with the lock portion 87 (e.g., d in FIG. 3), the protrusion 81 is in contact with any of the inclined portions 101 and 102 (e.g., 3 e), the rod 12 and the cylinder 11 are moved relative to the cam portion 86 in the axial direction of the cylinder while being guided away from the lock portion 87 in the circumferential direction of the cylinder (FIG. 3 e). For example, in FIG. 3 f), the cylinder portion 86 moves relatively to the cam portion 86 in the cylinder axial direction, and is in contact with any one of the inclined portions 91 and 93 of the cam portion 86 (for example, in FIG. 3 b). The rod 12 and the cylinder 11 are relatively rotated by the guidance of which one of the 91 and 93 contacts, and moves to the cam portion 86 in the cylinder axial direction relatively to contact the bottom of the recess 92. To stop (eg, c of FIG. 3).

In addition, when the position of the cylinder 81 in the circumferential direction of the protrusion 81 matches the regulating portion 88 (eg, FIG. 3G), the protrusion 81 comes into contact with any of the inclined portions 108 and 109 (eg, FIG. 3 h), while the rod 12 and the cylinder 11 are rotated relative to each other by the guide, they move relatively to the cam portion 86 in the cylinder axial direction and move away from the restricting portion 88 in the cylinder circumferential direction (for example, I) of FIG. 3, and then, it moves to the cam part 86 side of a cylinder axial direction relatively, and contacts any of the inclination parts 91 and 93 of the cam part 86 (for example, j of FIG. 3), The rod 12 and the cylinder 11 are relatively rotated by the guidance of which one of the 91 and 93 contacts, and further moves toward the cam portion 86 in the cylinder axial direction to the bottom of the recess 92. It comes into contact and stops (eg, k in FIG. 3).

That is, in either case, the projection 81 is not located in the recess 95 located on the other side of the cylinder axial direction among the recesses 92 and 95 recessed in one side of the cylinder axial direction, but on one side of the cylinder axial direction. It is located in the recess 92 located. Thus, when the projection 81 is located in the recessed part 92, as mentioned above, the rod 12 will be in the largest protrusion state, and the rod 12 and the cylinder 11 will be located in a 1st relative rotational position, In addition, the marks 119 and 120 of the positioning part 118 match the position of a cylinder circumferential direction.

Subsequently, when the operator rotates the cylinder 11 in one of 90 degrees in a state where the projection 81 is located in the recess 92, either of the recess 92 and the inclined portions 91 and 93. By the guide on the side, the projection 81 moves in the circumferential direction of the cylinder (for example, l and m in FIG. 3) while moving toward the opposite side to the cam portion 86 in the cylinder axial direction against the gas reaction force. 94, 96) (eg, n, o in FIG. 3), enters the recess 95 by gas reaction force and stops in contact with its bottom (eg, p in FIG. 3). Thus, the rod 12 and the cylinder 11 are positioned at the second relative rotational position to be in the unlocked state.

At this time, the gas reaction force is applied to the cylinder until either one of the inclined portions 91 and 93 is moved to ride over any of the convex portions 94 and 96 (for example, c → l → n or k → m → o in FIG. 3). Rotational resistance is generated at 11, and when one of the convex portions 94 and 96 is crossed (for example, n → p or o → p in FIG. 3), the projection 81 is recessed by gas reaction force. It naturally enters into (95) and comes into contact with its bottom, resulting in a decrease in rotational resistance. In addition, if the user wants to ride over the other of the convex portions 94 and 96, rotational resistance due to gas reaction force is generated again. As a result, when the projection 81 is located in the recessed portion 95, an accent is generated in which the rotational operation force of the cylinder 11 is lighter than before and after, and a so-called click feeling is generated.

By this feeling of click, the operator judges that the lock is in the unlocked state where the lock is released, and swings the opening / closing member in the closing direction against the gas reaction force. In this case, the rod 12 moves to the rod insertion side, and the protrusion 81 moves to the opposite side to the cam portion 86 in the cylinder axial direction relatively. At that time, since the position in the cylinder circumferential direction of the protrusion 81 coincides with the inclined portion 112 of the restricting portion 88, the protrusion 81 contacts the inclined portion 112, and the rod 12 is guided by the guide. ) Relative to the cam portion 86 in the cylinder axial direction (for example, q in FIG. 3) while relatively rotating the cylinder 11, away from the inclined portion 112, and then the projection 81. ) Moves relatively to the cam portion 86 in the cylinder axial direction as it is (for example, r in FIG. 3). 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.

On the other hand, when the operator 81 swings the opening / closing member in the closing direction against the gas reaction force without rotating the cylinder 11 in the state where the projection 81 is located in the recess 92, the rod 12 is inserted into the rod. The projection 81 is moved to the opposite side to the cam portion 86 in the cylinder axial direction, and the projection 81 is locked because the position of the lock portion 87 and the cylinder circumferential direction is matched. It contacts with the recessed part 103 of 87, and stops at the bottom position (for example, s, t of FIG. 3), and the relative movement to the opposite side to the cam part 86 of further cylinder axial direction is regulated. That is, the lock state is established.

In addition, even when the projection 81 is located in the recessed portion 92, the relative rotational position of the rod 12 and the cylinder 11 may be adjusted by the projection ( When the center of the cylinder 81 is located at the outer side in the cylinder circumferential direction than the lock portion 87, the state becomes an unlocked state, and when the operator swings the opening / closing member in the closing direction against the gas reaction force, the projection 81 is relative. Thus, the lock portion 87 is turned over in the cylinder axial direction, and after that, the rod 12 moves to the rod insertion side as it is, and the opening and closing member is closed, and then the opening and closing member is moved to the lock mechanism as necessary. Is locked by.

For example, when the operator places a load on the opening / closing member to increase the mass of the opening / closing member, or the gas pressure in the cylinder 11 decreases, the gas reaction force decreases, and the cylinder device protrudes the rod 12 to the maximum. When it cannot be maintained in a 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, so that the projection 81 is located in the recess 92, That is, the cylinder 11 and the rod 12 are moved in the first relative rotational position so that the rod 12 moves to the rod insertion side, and the protrusion 81 moves to the opposite side to the cam portion 86 in the cylinder axial direction relatively. . Also in this case, since the protrusion 81 coincides with the position of the lock portion 87 in the cylinder circumferential direction, the protrusion 81 contacts the concave portion 103 of the lock portion 87 and stops at the bottom position thereof (for example, in FIG. 3). s, t) and the relative movement to the opposite side to the cam part 86 in the cylinder axial direction more than that are regulated. Therefore, the locked state in which the movement of the rod 12 to the rod insertion side is restricted is maintained, and the opening / closing member is kept open.

In this state, when closing the opening / closing member, the operator rotates the cylinder 11 with the intention of closing the opening / closing member, so that the protrusion 81 is moved in the cylinder circumferential direction from the recess 103 of the lock portion 87. When it moves outward, since the lock part 87 which regulated the movement to the opposite side to the cam part 86 of the cylinder axial direction of the projection 81 does not exist, the projection 81 will be relatively after that. It moves to the opposite side to the cam part 86 of a cylinder axial direction, the rod 12 moves to an insertion side, and the opening-closing member is closed, and the opening-closing member is locked by the lock mechanism as needed.

In the cylinder device described in Patent Document 1, if the rod is protruded from the cylinder as much as possible, the lock state is automatically controlled to regulate the movement of the rod in the insertion direction to the cylinder. In this cylinder device, the rod protrudes from the cylinder again. The lock is released by moving in the direction. In this way, if the lock is released by moving the rod in the protruding direction from the cylinder, the direction of unlocking is the same as the normal direction of the rod's operation, for example, if the operator accidentally bumps into the opening / closing member, for example, the lock is inadvertently locked. Is likely to be released.

In addition, in the cylinder device described in Patent Document 2, when the rod is protruded from the cylinder to the vicinity of the maximum length and the cylinder is rotated, it is in a locked state that regulates the movement of the rod in the insertion direction to the cylinder. If the cylinder is in the locked state by rotating the cylinder, only the operation necessary to bring it into the locked state is cumbersome. In addition, when the lock operation is forgotten, the lock release is maintained, and thus the function as a safety device cannot be fulfilled.

In addition, in the cylinder device described in Patent Document 3, when the rod protrudes from the cylinder to the vicinity of the maximum length, the dust cover is tilted so as to be in a locked state which automatically regulates the movement of the rod into the cylinder. In this cylinder device, the lock is released by returning the tilting of the dust cover. As described above, if the dust cover is tilted and locked, the operation is cumbersome, and a space for tilting the dust cover is required, and thus, the mounting space is likely to be restricted.

In contrast, according to the first embodiment described above, when the rod 12 is in the maximum protruding state, the inclined portion provided on the inner circumferential surface of the cylinder 11 is provided with the projection 81 provided on the outer circumferential surface of the rod 12. By 91 and 93, it is guide | induced to a predetermined 1st relative rotation position. In this first relative rotation position, the projection 81 is held in contact with the lock portion 87 even if the rod 12 moves in the insertion direction. Therefore, it is locked automatically near the maximum length. Then, if the operator is displaced in the first relative rotation position by manually rotating the cylinder 11 and the rod 12 manually, the protrusion 81 contacts the lock portion 87 even if the rod 12 moves in the insertion direction. You can move without doing it. Therefore, since it is necessary to operate with the intention of the operator to relatively rotate the cylinder 11 and the rod 12, it can prevent that a lock is inadvertently released. In addition, since it is an operation of manually rotating the cylinder 11 and the rod 12 relative to each other, unlocking is also facilitated. Therefore, usability can be improved. In addition, since the lock release operation is an operation for relatively rotating the cylinder 11 and the rod 12, it is not necessary to consider the swing of the release member and the like, and it is difficult to be restricted by the mounting space.

In other words, when the rod 12 extends to its maximum length, the inclined portions 91 and 93 restrict the relative rotational position of the cylinder 11 and the rod 12 from decreasing near the maximum length. To the lock position automatically. 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 of making the relative rotational position of the cylinder 11 and the rod 12 into the unlocking position is necessary, it is possible to prevent the lock from being inadvertently released. Moreover, since it is operation of making the relative rotation position of the cylinder 11 and the rod 12 into a lock release position, lock release becomes easy. Therefore, usability can be improved. In addition, since the unlocking operation is an operation in which the relative rotational positions of the cylinders 11 and the rods 12 are the unlocking positions, it is not necessary to consider the swinging of the release members and the like, and therefore it is difficult to be restricted by the mounting space.

In addition, when looking at the positioning part 118 in the outer appearance of the cylinder 11, since the projection 81 can confirm that it is in the lock position which opposes the lock part 87 in the cylinder axial direction, the projection 81 The operator can easily and reliably recognize that the lock portion 87 is in a lock position opposite to the lock portion 87 in the cylinder axial direction. Therefore, usability and safety can be further improved.

Moreover, when the cylinder 11 and the rod 12 are in the predetermined 2nd relative rotational position which becomes an unlocked state different from a predetermined 1st relative rotational position, the convex part provided in the inner peripheral surface of the cylinder 11 94, the lock release position defining part 97 consisting of the concave portion 95 and the convex portion 96 contacts the protrusion 81 when the rod 12 moves in the protruding direction to move in the rotational direction. Since it is regulated, the cylinder 11 and the rod 12 can be notified to the operator by the change of a feeling of operation that the predetermined 2nd relative rotational position which becomes the unlocked state became. Therefore, usability can be further improved.

Moreover, since the cam mechanism 115 can be incorporated in the cylinder 11, since it is the same external shape as the conventional gas spring, the whole size can be miniaturized.

On the other hand, as shown in FIG. 4, in the 1st Embodiment, the lock release position which consists of the convex part 94, the recessed part 95, and the convex part 96 of the cam part 86 of the inner peripheral member 82. As shown in FIG. The prescribed part 97 may be eliminated. In this case, the restricting portion 88 for restricting the entry of the projection 81 into the recessed portion 95 can also be eliminated.

"2nd Embodiment"

Next, 2nd Embodiment which concerns on this invention is described mainly based on the part different from 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 2nd Embodiment, the cam mechanism 115 provided between the cylinder 11 and the rod 12 is set as the structure opposite to 1st Embodiment. That is, the projection 81 similar to 1st Embodiment extended in the cylinder radial direction is formed in the inner peripheral surface of the inner peripheral member 82 (cylinder side member) which comprises the cylinder 11 is formed. The outer circumference of the main shaft portion 68 of the rod 12 is provided with a cam portion 86, a lock portion 87, and a restricting portion 88 (not shown in FIG. 5) in the same manner as in the first embodiment. In the state where the member 130 (rod side member) arrange | positions the cam part 86 to the opposite side to the opening part 23, and the lock part 87 and the restricting part 88 are arrange | positioned at the opening part 23 side, the rod 12 It is fixed to). Here, the outer circumferential member 130 extends to the opposite side to the opening 23, and an inner flange portion 131 extending radially inward is formed at the extension front end thereof. This inner flange part 131 is caught by the piston 13 and the main shaft part 68 by the edge part by the fitting shaft part 69 side of the main shaft part 68 of the rod 12. In this case, the outer circumferential member 130 constitutes a part of the rod 12, and the cam portion 86, the lock portion 87, and the restricting portion 88 are formed on the outer circumferential surface of the rod 12.

Accordingly, the inclined portions 91 and 93 of the cam portion 86 are provided on the outer circumferential surface of the rod 12, and contact with the protrusion 81 when the rod 12 is in the maximum protruding state, and the cylinder 11 And the rod 12 are rotated relative to the predetermined first relative rotation position. In addition, the recessed part 95 and the convex parts 94 and 96 are provided in the outer peripheral surface of the rod 12, and the cylinder 11 and the rod 12 are predetermined | prescribed agents different from the said 1st relative rotation position. 2 when the rod 12 moves in the protruding direction by being opposed to the protrusion 81 in the relative rotational position, the lock release position defining portion that contacts the protrusion 81 and regulates movement in the rotational direction ( 97). Further, the lock portion 87 provided on the outer circumferential surface of the rod 12 has a protrusion 81 when the cylinder 11 and the rod 12 are in the first relative rotational position in the state where the rod 12 is in the maximum protruding state. ), The rod 12 is in a locked state in contact with the projection 81 to hold the projection 81 when the rod 12 moves in the insertion direction.

The operation of this second embodiment is almost the same as in the first embodiment.

According to the second embodiment described above, when the rod 12 is in the maximum protruding state, the protrusions 81 provided on the inner circumferential surface of the cylinder 12 are inclined portions 91 provided on the outer circumferential surface of the rod 12. 93, it is guided to a predetermined first relative rotational position. In this first relative rotation position, the lock portion 87 is held in contact with the projection 81 even when the rod 12 moves in the insertion direction. Therefore, it is locked automatically near the maximum length. Then, when the cylinder 11 and the rod 12 rotate relative to each other and are displaced from the first relative rotation position, the lock portion 87 does not contact the protrusion 81 even when the rod 12 moves in the insertion direction. You can move. Therefore, usability can be improved similarly to 1st Embodiment.

Moreover, when the cylinder 11 and the rod 12 are in the predetermined 2nd relative rotation position which becomes an unlocked state different from a 1st relative rotation position, the convex part 94 provided in the outer peripheral surface of the rod 12 The lock release position defining part 97 consisting of the concave portion 95 and the convex portion 96 makes contact with the protrusion 81 to regulate the movement in the rotation direction when the rod 12 moves in the protruding direction. As a result, the cylinder 11 and the rod 12 can be conveyed to the operator by a change in the feeling of operation that the second relative rotational position becomes the unlocked state. Therefore, usability can be further improved.

In the above-described first and second embodiments, the cylindrical cylinder, one end of which is inserted into one end of the cylinder, is pushed in the protruding direction, and is rotatable relative to the cylinder, the inner peripheral surface of the cylinder, and the A protrusion provided on one of the outer circumferential surfaces of the rod and extending in the radial direction, and provided on the other of the inner circumferential surface of the cylinder and the outer circumferential surface of the rod, and when the rod is in the maximum protruding state, the rod is brought into contact with the protrusion to make the rod An inclined portion that rotates relative to and guides to a predetermined relative rotational position, and the other of an inner circumferential surface of the cylinder and an outer circumferential surface of the rod. In the rotational position, the rod is placed in the insertion direction by opposing the projection in the axial direction. It is characterized by having a lock part which contacts with the said projection when it moved, and hold | maintains the said projection.

Accordingly, when the rod is in the maximum protruding state, the projection provided on either the inner circumferential surface of the cylinder or the outer circumferential surface of the rod is moved to a predetermined relative rotational position by the inclined portion provided on the other of the inner circumferential surface of the cylinder and the outer circumferential surface of the rod. Induced. In this predetermined relative rotational position, the projection is held in contact with the lock portion even if the rod moves in the insertion direction. Therefore, it is locked automatically near the maximum length. Then, by manually rotating the cylinder and the rod by the operator, if the cylinder is displaced from the predetermined relative rotational position, the protrusion can move without touching the lock portion even if the rod moves in the insertion direction. Therefore, since the operation of relatively rotating the cylinder and the rod is necessary, it is possible to prevent the lock from being inadvertently released. In addition, since the operation of manually rotating the cylinder and the rod is relatively performed, unlocking is also facilitated. Therefore, usability can be improved. In addition, since the lock release operation causes the cylinder and the rod to rotate relatively, it is not necessary to consider the swing of the release member and the like, and it is difficult to be restricted by the mounting space.

Moreover, 1st, 2nd embodiment is provided in the other of the inner peripheral surface of the said cylinder, and the outer peripheral surface of the said rod, and the said cylinder and the said rod are made into the predetermined 2nd relative rotational position different from the said predetermined relative rotational position. When the rod is moved in the axial direction by facing the projection in the axial direction, it is characterized in that it has a lock release position defining portion that contacts the projection and regulates the movement in the rotational direction.

As a result, when the cylinder and the rod reach a predetermined second relative rotation position different from the predetermined relative rotation position, the lock release position defining portion formed on the other of the inner circumferential surface of the cylinder and the outer circumferential surface of the rod may have moved the rod in the protruding direction. Since the movement in the rotational direction is regulated in contact with the projection at the time, the operator can be informed that the cylinder and the rod have become a predetermined second relative rotational position by changing the feeling of operation. Therefore, usability can be further improved.

Further, in the first and second embodiments, a cylindrical cylinder, one end of which is inserted into one end of the cylinder, has a rod that is pressed in the protruding direction and which is relatively rotatable with respect to the cylinder, In a relative rotational position, a lock position for restricting the reduction of the rod near the maximum length and a lock release position for allowing the rod to decrease near the maximum length are placed, and when the rod is extended to the maximum length, And automatic locking means for rotating the relative rotational position to the lock position.

As a result, the automatic locking means automatically rotates the relative rotation position between the cylinder and the rod to the lock position that restricts the rod from decreasing near the maximum length when the rod is extended to the maximum length. Therefore, when the rod is stretched to the maximum length, it is automatically in a locked state that restricts the rod from shrinking around the maximum length. In addition, when the relative rotational position of the cylinder and the rod is set to the unlocking position that allows the manual reduction of the position near the maximum length, the rod can be reduced near the maximum length. Therefore, since the operation of setting the relative rotational position between the cylinder and the rod to be the unlocking position is necessary, it is possible to prevent the lock from being inadvertently released. Moreover, since it is operation of making relative rotation position of a cylinder and a rod into a lock release position, lock release becomes easy. Therefore, usability can be improved. In addition, since the unlocking operation is an operation in which the relative rotational positions of the cylinder and the rod are set to the unlocking position, it is not necessary to consider the swinging of the release member or the like, and it is difficult to be restricted by the mounting space.

Moreover, 1st, 2nd embodiment is characterized by having the positioning means which can confirm with the external appearance of the said cylinder that the said projection is in the position which axially opposes the said lock part.

Accordingly, the operator can easily confirm that the projection is located at the position opposite to the lock portion in the axial direction because the positioning means on the outer appearance of the cylinder can confirm that the projection is at the position opposite the lock portion in the axial direction. Can be recognized. Therefore, usability can be further improved.

&Quot; Third Embodiment "

Next, 3rd Embodiment which concerns on this invention is described mainly based on the part different from 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 3rd Embodiment, the dust cover 140 which covers the part which protrudes from the cylinder 11 of the rod 12 is provided. The dust cover 140 has a cylindrical dust cover main body 143 having a substantially cover having a cylindrical portion 141 and a lid portion 142 that closes one end thereof, and has a lid portion 142. It is rotatably supported by the rod 12 in the center of the. The dust cover 140 is provided so as to be relatively rotatable with respect to the rod 12 and the cylinder 11 in a state where the movement in the axial direction with respect to the rod 12 is restricted.

The dust cover main body 143 has two annular inner protruding portions 145 and 146 smaller in diameter than the main body portion 144 of the other constant diameter on the side opposite to the lid portion 142 of the cylindrical portion 141. ) Is coaxially formed by plastic working. Moreover, the dust cover main body 143 is provided with the some convex convex part 147 which protrudes radially inward at the position between two inner protrusion parts 145 and 146. As shown in FIG.

And in 3rd Embodiment, the agent extended in the cylinder radial direction to the outer peripheral surface of the position opposite to the opening part 23 rather than the inner protrusion part 27 of the inner protrusion part 27 of the trunk | drum 20 of the cylinder 11 in the vicinity. A plurality of projections 81 of the same manner as in the first embodiment are formed. In this embodiment, the cylinder itself comprises the cylinder side member of this invention.

Moreover, the cam part 86, the lock part 87, and the control part 88 (not shown in FIG. 6) of the same form as 1st Embodiment inside the cylindrical part 141 of the dust cover main body 143. The inner circumferential member 82 (rod-side member) having the cam portion 86 is fixed to the side opposite to the opening portion 23, and the lock portion 87 and the restricting portion 88 are disposed on the opening portion 23 side and fixed. have. The inner circumferential member 82 is sandwiched by the inner protrusions 145 and 146 on both sides of the dust cover main body 143, and the locking convex portion 147 enters the locking recess 83 of the outer circumferential surface. As a result, the inner circumferential member 82 is restricted so as to be unable to move in the cylinder axial direction and the cylinder circumferential direction with respect to the dust cover main body 143. The inner circumferential member 82 constitutes the dust cover 140 together with the dust cover main body 143.

Therefore, the cam mechanism 115 which consists of the projection 81 and the cam part 86, the lock part 87, and the restricting part 88 is provided between the cylinder 11 and the dust cover 140. As shown in FIG. Accordingly, the cam mechanism 115 is not provided between the cylinder 11 and the rod 12 in the cylinder 11.

In addition, the cylinder 11 and the dust cover 140 are provided with the positioning part 118 like 1st Embodiment which can confirm visually that the protrusion 81 is located in the lock part 87. As shown in FIG. The positioning unit 118 includes a triangular mark 119 formed on the trunk portion 20 of the cylinder 11 to be directed toward the dust cover 140 along the cylinder axial direction, and the dust cover 140. The tubular portion 141 is formed of a triangular mark 120 which is formed to face the cylinder 11 along the cylinder axial direction. That is, this positioning part 118 can confirm that the protrusion 81 is in the lock position which opposes the lock part 87 in the cylinder axial direction from the external appearance of the dust cover 140.

By the above, the inclination parts 91 and 93 of the cam part 86 are provided in the inner peripheral surface of the dust cover 140, and when the rod 12 is in the maximum protruding state, it contacts with the projection 81 and the dust cover ( 140 is rotated relative to the cylinder 11 to guide the predetermined first relative rotational position. Moreover, the recessed part 95 and the convex parts 94 and 96 are provided in the inner peripheral surface of the dust cover 140, and the cylinder 11 and the dust cover 140 are different from the said 1st relative rotational position, When the rod 12 moves in the protruding direction when the rod 12 moves in the protruding direction by being opposed to the protrusion 81 in the predetermined second relative rotational position, which is the lock position, the movement in the rotational direction is regulated. The lock release position defining section 97 is configured. In addition, the lock portion 87 provided on the inner circumferential surface of the dust cover 140 is a projection when the cylinder 11 and the dust cover 140 are in the first relative rotational position in the state where the rod 12 is in the maximum protruding state. By opposing to 81 in the axial direction, the rod 12 is in a locked state in contact with the projection 81 to hold the projection 81 when the rod 12 moves in the insertion direction. On the other hand, in the third embodiment, the mounting bracket 32 (not shown in FIG. 6) is fixed to the cylinder 11 so as not to rotate.

In this third embodiment, when the operator swings the opening / closing member in the opening direction, the rod 12 moves to the rod protrusion side, and the dust cover 140 also moves in the rod protrusion direction integrally with the rod 12. do. At that time, the projection 81 is relatively guided to the lock portion 87, the restricting portion 88 and the cam portion 86 similarly to the first embodiment so as to face the dust cover 140 and the cylinder 11. While rotating, it comes into contact with the bottom of the recess 92 (for example, c, k in FIG. 3). In this state, the rod 12 is in the maximum protruding state most protruding from the cylinder 11, so that the cylinder 11 and the dust cover 140 are located in the first relative rotational position.

When the operator rotates the dust cover 140 in the state where the protrusion 81 is located in the recess 92, the protrusion 81 is similar to the first embodiment in the recess 92 and the inclined portion ( Relative movement by the guidance of either one of 91 and 93, and contacting the recess 95 by gas reaction force (for example, p in FIG. 3) to rotate the cylinder 11 and the dust cover 140 in a second relative rotation. Position it.

In this state, when the operator swings the opening / closing member in the closing direction, the rod 12 and the dust cover 140 are integrally moved to the rod insertion side, so that the projection 81 is restricted as in the first embodiment. Guided to the inclined portion 112 of the portion 88 (for example, q in FIG. 3), and away from the restricting portion 88 in the circumferential direction of the cylinder while relatively rotating the dust cover 140 and the cylinder 11 (for example, R) of FIG. 3. Accordingly, the rod 12 and the dust cover 140 are moved to the rod insertion side.

On the other hand, when the operator 81 swings the opening / closing member in the closing direction without rotating the dust cover 140 in the state where the protrusion 81 is located in the recess 92, the rod 12 moves to the rod insertion side, The dust cover 140 also moves to the rod insertion side integrally with the rod 12, at which time the projection 81 contacts the recess 103 of the lock portion 87 and stops as in the first embodiment. (E.g., s, t in FIG. 3), the lock 12 is regulated to restrict movement of the rod 12 and the dust cover 140 to the rod insertion side.

Also, in the state where the projection 81 is located in the recess 92, even if the projection 81 is not positioned in the recess 95, the center of the projection 81 is the outer circumferential direction of the lock 87 in the cylinder circumference. If it is in the state located in, the rod 12 and the dust cover 140 move to the rod insertion side similarly to the first embodiment, and the opening and closing member is in a closed state.

When the rod 12 cannot be maintained in the maximum protruding state due to a decrease in gas pressure, the opening / closing member swings in the closing direction, and the cylinder 11 and the dust cover 140 remain in the first relative rotational position. The rod 12 and the dust cover 140 are integrally moved to the rod insertion side. Since the projections 81 are aligned with the lock portion 87 in the circumferential direction of the cylinder, the recesses 103 of the lock portion 87 are formed. ) And stop (e.g., s, t in FIG. 3) to restrict movement of the rod 12 and dust cover 140 to the rod insertion side.

In this state, in the case of closing the opening / closing member, when the operator rotates the dust cover 140 and relatively moves the projection 81 from the recess 103 of the lock portion 87 to the outer side in the cylinder circumferential direction, the rod 12 and the dust cover 140 are moved to the insertion side, and the opening and closing member is closed.

According to the third embodiment described above, when the rod 12 is in the maximum protruding state, the protrusion 81 provided on the outer circumferential surface of the cylinder 12 is formed of the dust cover 140 integrated with the rod 12. The inclined portions 91 and 93 provided on the inner circumferential surface are led to a predetermined first relative rotational position. In this first relative rotation position, the lock portion 87 is held in contact with the projection 81 even when the rod 12 moves in the insertion direction together with the dust cover 140. Therefore, it is locked automatically near the maximum length. When the cylinder 11 and the dust cover 140 are rotated relative to each other and displaced from the first relative rotation position, the lock 11 is locked to the protrusion 81 even when the rod 12 moves in the insertion direction together with the dust cover 140. The part 87 can move without contacting. In other words, when the rod 12 extends to the maximum length, the inclined portions 91 and 93 reduce the relative rotational position between the cylinder 11 and the dust cover 140 and the rod 12 decreases near the maximum length. Rotate automatically to the regulating lock position. In addition, when the relative rotational position of the cylinder 11 and the dust cover 140 is set to the unlocking position which allows reduction in the vicinity of the maximum length, the rod 12 can be reduced in the vicinity of the maximum length. Therefore, similarly to the first embodiment, the usability can be improved and the limitation of the mounting space can be made difficult.

In addition, looking at the positioning unit 118 in the outer appearance of the dust cover 140, it is possible to confirm that the projection 81 is in the lock position facing the lock portion 87 in the cylinder axial direction, so that the projection ( The operator can easily and reliably recognize that 81 is in the lock position opposite to the lock portion 87 in the axial direction.

In addition, when the cylinder 11 and the dust cover 140 are in a predetermined second relative rotation position to be in an unlocked state different from the predetermined first relative rotation position, the convex provided on the inner circumferential surface of the dust cover 140 is provided. The unlocking position defining part 97 consisting of the part 94, the concave part 95 and the convex part 96 contacts the protrusion 81 when the rod 12 moves in the protruding direction and moves in the rotational direction. Since the movement is regulated, the cylinder 11 and the dust cover 140 can be informed to the operator by the change in the feeling of operation that the second relative rotation position becomes the unlocked state, and the usability can be further improved. .

&Quot; Fourth embodiment "

Next, 4th Embodiment which concerns on this invention is described mainly based on the part different from 1st-3rd Embodiment based on FIG. 3 and FIG. In addition, about the site | part common in 1st-3rd embodiment, it shows with the same code | symbol and the same code | symbol.

In 4th Embodiment, the cam mechanism 115 provided between the cylinder 11 and the dust cover 140 is reversed from 3rd Embodiment. That is, the inner peripheral member 82 (rod side member) in which the protrusion 81 extended in the radial direction of the cylinder was formed in the inner peripheral surface of the form similar to 2nd Embodiment on the inner peripheral side of the dust cover main body 143 is fixed and fitted. have. The inner circumferential member 82 is also sandwiched by the inner protruding portions 145 and 146 on both sides of the dust cover main body 143, and the locking convex portion 147 enters the locking concave portion 83 of the outer circumferential surface to form a dust cover. The movement of the cylinder axial direction and the cylinder circumferential direction with respect to the main body 143 is regulated. Moreover, the outer peripheral member 130 (cylinder side member) of the same form as 2nd Embodiment in which the cam part 86, the lock part 87, and the restricting part 88 (not shown in FIG. 7) was formed in the outer peripheral surface, The cam portion 86 is arranged on the opening 23 side, and the lock portion 87 and the restricting portion 88 are disposed on the side opposite to the opening portion 23, and are fixed to the body portion 20 of the cylinder 11 by fitting.

In this case, the inner circumferential member 82 constitutes a part of the dust cover 140, and a protrusion 81 extending in the cylinder radial direction is formed on the inner circumferential surface of the dust cover 140. In addition, the outer circumferential member 130 constitutes a part of the cylinder 11, and the cam portion 86, the lock portion 87, and the restricting portion 88 are formed on the outer circumferential surface of the cylinder 11. The outer circumferential member 130 extends toward the opening 23 side, and an inner flange portion 131 extending radially inward is formed at an end portion of the opening 23. This inner flange part 131 is caught by the edge part by the side of the opening part 23 of the cylinder main body 22. As shown in FIG.

Therefore, the inclined portions 91 and 93 of the cam portion 86 are provided on the outer circumferential surface of the cylinder 11, and when the rod 12 is in the maximum protruding state, the inclined portions 91 and 93 come into contact with the protrusion 81 to close the dust cover 140. It rotates relative to the cylinder 11, and guides it to a predetermined 1st relative rotation position. Moreover, the recessed part 95 and the convex parts 94 and 96 are provided in the outer peripheral surface of the cylinder 11, and the cylinder 11 and the dust cover 140 are unlocked different from the said 1st relative rotation position. When the rod 12 moves in the protruding direction by being opposed to the protrusion 81 in the axial direction when the predetermined second relative rotational position is brought into a state, the protrusion 81 contacts the protrusion 81 to regulate movement in the rotational direction. The lock release position defining section 97 is configured. Further, the lock portion 87 provided on the outer circumferential surface of the cylinder 11 has a projection (when the rod 11 is in the maximum protruding state when the cylinder 11 and the dust cover 140 are in the above-described first relative rotation position). By facing the 81 in the axial direction, the rod 12 is in a locked state in contact with the projection 81 to hold the projection 81 when the rod 12 moves in the insertion direction.

The operation of this fourth embodiment is almost the same as in the third embodiment.

According to the fourth embodiment described above, when the rod 12 is in the maximum protruding state, the protrusion 81 provided on the inner circumferential surface of the dust cover 140 integral with the rod 12 is formed of the cylinder 11. By the inclination parts 91 and 93 provided in the outer peripheral surface, it guides to a predetermined 1st relative rotation position. In this first relative rotation position, the lock portion 87 is held in contact with the projection 81 even when the rod 12 moves in the insertion direction together with the dust cover 140. Therefore, it is locked automatically near the maximum length. When the cylinder 11 and the dust cover 140 are rotated relative to each other and displaced from the first relative rotation position, the lock portion is formed on the protrusion 81 even if the rod 12 moves together with the dust cover 140 in the insertion direction. The 87 can move without being in contact. Therefore, similarly to the third embodiment, the usability can be improved and the limitation of the mounting space can be made difficult.

In addition, when the cylinder 11 and the dust cover 140 are in a predetermined second relative rotational position which is in an unlocked state different from the first relative rotational position, the convex portion 94 provided on the outer circumferential surface of the cylinder 11 is provided. ), The locking release position defining part 97 consisting of the recessed part 95 and the convex part 96 rotates in contact with the projection 81 of the dust cover 140 when the rod 12 moves in the protruding direction. Since the movement in the direction is regulated, usability can be further improved as in the third embodiment.

Moreover, in 4th Embodiment, only the outer peripheral member 130 and the dust cover 140 are provided, and the conventional gas spring can be used as it is.

In the above-described third and fourth embodiments, the cylindrical cylinder, the rod having one end inserted into one end of the cylinder and being urged in the protruding direction, and the movement in the axial direction with respect to the rod are restricted, and the cylinder A dust cover provided to be rotatable relative to the dust cover, a protrusion extending in a radial direction provided on one of the inner circumferential surface of the dust cover and the outer circumferential surface of the cylinder, and provided on the other of the inner circumferential surface of the dust cover and the outer circumferential surface of the cylinder, When the rod is in the maximum protruding state, an inclined portion that contacts the protrusion and rotates the dust cover relative to the cylinder to a predetermined relative rotation position, and another one of the inner circumferential surface of the dust cover and the outer circumferential surface of the cylinder. The dust cover and the cylinder in the maximum protruding state of the rod It is characterized by having the lock part which contacts the said projection and hold | maintains the said projection when the rod is moved to an insertion direction by opposing to the said projection in an axial direction at the predetermined relative rotational position.

Accordingly, when the rod is in the maximum protruding state, the projection provided on either the inner circumferential surface of the dust cover or the outer circumferential surface of the cylinder is predetermined relative rotation by the inclined portion provided on the other of the inner circumferential surface of the dust cover and the outer circumferential surface of the cylinder. Guided to position. In this predetermined relative rotational position, the projection is held in contact with the lock portion even if the rod moves in the insertion direction. Therefore, it is locked automatically near the maximum length. Then, when the dust cover and the cylinder are relatively rotated and displaced from the predetermined relative rotational position, the projection can move without contacting the lock portion even if the rod moves in the insertion direction. Therefore, since the operation of relatively rotating the dust cover and the cylinder is necessary, it is possible to prevent the lock from being inadvertently released. Moreover, since it is an operation | movement which makes the dust cover and a cylinder rotate relatively, lock release becomes easy. Therefore, usability can be improved. In addition, since the lock release operation relatively rotates the dust cover and the cylinder, it is not necessary to consider the swinging of the release member and the like, and it is difficult to be restricted by the mounting space.

Moreover, 3rd, 4th embodiment is provided in the other of the inner peripheral surface of the said dust cover, and the outer peripheral surface of the said cylinder, The said predetermined | prescribed 2nd relative rotation position in which the said dust cover and the said cylinder are different from the said predetermined relative rotation position is provided. When it is, it is characterized in that it has a lock release position defining portion which is opposed to the protrusion in the axial direction to contact the protrusion and regulate the movement in the rotational direction when the rod is moved in the protrusion direction.

Accordingly, when the dust cover and the cylinder are in the second predetermined rotational position different from the predetermined relative rotational position, the lock release position defining portion provided on the other of the inner circumferential surface of the dust cover and the outer circumferential surface of the cylinder has a rod in the protruding direction. Since the movement in the rotational direction is regulated in contact with the projection when it moves, the dust cover and the cylinder are brought into a predetermined second relative rotational position, so that the operator can be informed by a change in the feeling of operation. Therefore, usability can be further improved.

In addition, in the third and fourth embodiments, a cylindrical cylinder, a rod, one end of which is inserted into one end of the cylinder and pressed in the protruding direction, and the movement in the axial direction is restricted with respect to the rod. Having a dust cover provided to be rotatable relative to the dust cover and the cylinder in a relative rotational position, a lock position for restricting reduction in the vicinity of the maximum length, and a lock release position for allowing the reduction in the vicinity of the maximum length; When extending | stretching to length, it is characterized by having the automatic lock means which rotates the relative rotation position of the said dust cover and the said cylinder to the said lock position.

As a result, when the rod extends to the maximum length, the automatic locking means automatically rotates the relative rotation position between the dust cover and the cylinder to the lock position that restricts the rod from decreasing near the maximum length. Therefore, when the rod is stretched to the maximum length, it automatically enters the locked state which restricts the reduction of the rod near the maximum length. Further, when the relative rotational position between the dust cover and the cylinder is set to the unlocking position allowing the reduction in the vicinity of the maximum length, the rod can be reduced in the vicinity of the maximum length. Therefore, since the operation | movement which makes a dust cover, a cylinder, and a relative rotation position into a lock release position is necessary, it can prevent that a lock is inadvertently released. Moreover, since it is operation of making relative rotation position of a dust cover and a cylinder into a lock release position, lock release becomes easy. Therefore, usability can be improved. In addition, since the unlocking operation is an operation in which the relative rotational position between the dust cover and the cylinder is used as the unlocking position, it is not necessary to consider the swinging of the release member and the like, and it is difficult to be restricted by the mounting space.

Moreover, 3rd, 4th embodiment is characterized by having the positioning means which can confirm with the external appearance of the said dust cover that the said projection is in the position which axially opposes the said lock part.

As a result, when the positioning means on the outer surface of the dust cover can be seen, it is possible to confirm that the projection is in a position opposite to the lock portion in the axial direction, so that the operator is in the position opposite to the lock portion in the axial direction. Can be easily and surely recognized. Therefore, usability can be further improved.

On the other hand, in the above-described first to fourth embodiments, the case where the rod 12 is pressed in the protruding direction by the pressure of the gas in the cylinder has been described. (12) may be deflected in the protruding direction.

In addition, in the above-mentioned 1st-4th embodiment, although the opening-and-closing member opened by the gas reaction force, the movement to the opening direction is a cylinder 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 apparatus, and in the case of the gas reaction force of the cylinder apparatus, the weight of the opening / closing member may be assisted and moved by the force of the operator, and the cylinder apparatus of this embodiment is applicable to all cases.

On the other hand, in the above-described first to fourth embodiments, it has been shown that gas and a small amount of oil liquid are mixed in the cylinder. However, the present invention is not limited to this. The gas may be sealed in the oil and the oil liquid may be sealed in the rod side. By such a configuration, it is possible to install the rod protruding side always vertically upward.

In addition, in the said 1st-4th embodiment, although the flow path hole 64 was shown to be normally open, it is not limited to this, The ring-shaped flexibility is shown in the upper surface of FIG. It is also possible to provide an annular metal disk valve and a fixed orifice having a small flow passage area which is always in communication. As a result, when the rod 12 is reduced, operation by a small force is possible, and when stretching, the stretching speed can be adjusted by the area of the fixed orifice.

On the other hand, in the said 1st-4th embodiment, although the rod 12 was fixed and the cylinder 11 side was rotatable, it is not limited to this, The rod 12 or the dust cover 140 side and The cylinder 11 may be rotated relative to each other, and the rod 12 or the dust cover 140 may be rotatable with respect to the mounting bracket 73, and the mounting bracket 32 may be fixed to the cylinder 11. The yaw is that 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 rotated relative to each other. do.

11 cylinder 12 rod
81: projection 87: lock portion
91, 93: inclined portion (automatic locking means) 97: lock release position defining portion
140: dust cover

Claims (7)

A cylindrical cylinder 11,
In the cylinder device comprising a rod (12) inserted protruded from one end of the cylinder (11) and pressed in the protruding direction,
At least a cylinder side member provided with restricted movement in the axial direction with respect to the cylinder 11, and a rod side member provided with restricted movement in at least the axial direction with respect to the rod 12 so as to be relatively rotatable,
A projection 81 provided on one of a circumferential surface of the cylinder side member or a circumferential surface of the rod side member and extending in the radial direction;
The projections are provided on the other of the circumferential surface of the cylinder-side member or the circumferential surface of the rod-side member facing the circumferential surface on which the projection 81 is provided, and when the rod 12 is to be in the maximum protruding state, the projections Inclined portions 91 and 93 in contact with 81 to guide the cylinder-side member relative to the rod-side member to lead to a predetermined relative rotational position;
A concave portion 92 which is continuously installed on the inclined portions 91 and 93 and in which the protrusion 81 guided by the inclined portions 91 and 93 is located;
The projection 81 is provided on the circumferential surface provided with the inclined portions 91 and 93 so that the cylinder-side member and the rod-side member are in the predetermined relative rotational position in the maximum protruding state of the rod 12. When the rod 12 is moved in the insertion direction by facing the concave portion 92 in which the rod is positioned, the protrusion 81 contacts the protrusion 81 to hold the protrusion 81 and insert the rod 12. And a lock portion (87) for restricting movement in the direction. 2. The cylinder according to claim 1, wherein the inclined portions (91, 93) are provided on a circumferential surface, so that the cylinder (11) and the rod (12) are in a predetermined second relative rotation position different from the predetermined relative rotation position. In this case, when the rod 12 moves in the protruding direction by facing the protrusion 81 in the axial direction, the lock release position defining portion 97 that contacts the protrusion 81 and regulates movement in the rotational direction is provided. Cylinder device characterized in that it has. The cylinder device according to claim 1 or 2, wherein the cylinder side member is provided on an inner circumference of the cylinder (11), and the rod side member is provided on an outer circumference of the rod (12). 3. A cylinder according to claim 1 or 2, characterized in that it has a positioning means (118) which can visually confirm that the projection (81) is at a position axially opposed to the lock portion (87). Device. 4. A cylinder device according to claim 3, characterized in that it has positioning means (118) which can visually confirm that said projection (81) is in a position axially opposed to said lock portion (87). The dust cover 140 is installed in the rod 12, and the cylinder side member is installed in the outer circumference of the cylinder 11, and in the inner circumference of the dust cover 140. A cylinder device comprising a rod side member. 7. A cylinder device according to claim 6, characterized in that it has positioning means (118) which can visually confirm that said projection (81) is at a position axially opposite said lock portion (87).

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