WO2016067723A1

WO2016067723A1 - Cylinder device

Info

Publication number: WO2016067723A1
Application number: PCT/JP2015/073805
Authority: WO
Inventors: 苓張
Original assignee: 日立オートモティブシステムズ株式会社
Priority date: 2014-10-31
Filing date: 2015-08-25
Publication date: 2016-05-06
Also published as: TW201629364A

Abstract

A cylinder device comprises: a reducible diameter lock stopper (88) that is provided on a rod (12); a first diameter reducing mechanism (91) that is provided in a cylinder (10), and that has a first inner circumferential section (93) to reduce the diameter of the lock stopper (88) by abutting an outer circumferential section (131) of the lock stopper (88) when the rod (12) moves in the extending direction and a locking unit (94) to restrict the movement of the rod (12) in the contracting direction by abutting one end of the lock stopper (88) with a diameter that was expanded after passing through a first inner circumferential section (93); and a second diameter reducing mechanism (84) that is provided to be able to move between the first diameter reducing mechanism (91) and one end of the cylinder (10) and that has a second inner circumferential section (101) to reduce the diameter of the lock stopper (88) to a size so as to pass through the first inner circumferential section (93) by abutting the outer circumferential section (131) of the lock stopper (88) when the rod (12) moves in the extending direction from a position in which the lock stopper (88) and the locking unit (94) are abutting.

Description

Cylinder device

The present invention relates to a cylinder device.
This application claims priority based on Japanese Patent Application No. 2014-223720 for which it applied on October 31, 2014, and uses the content here.

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

Japanese Patent Laid-Open No. 50-54775

The above cylinder device may be unlocked carelessly.

Therefore, an object of the present invention is to provide a cylinder device that can prevent the lock from being inadvertently released.

According to the first aspect of the present invention, in the cylinder device, the lock mechanism is provided with the rod positioned in the axial direction and provided with a lock stopper capable of reducing the diameter with a spring property in the diameter increasing direction, and one end of the cylinder. A first inner peripheral portion that is provided at a position spaced apart from the other end side, and abuts on the outer peripheral portion of the lock stopper to reduce the diameter of the lock stopper when the rod moves in the extending direction; and A first diameter-reducing mechanism having a lock portion that abuts on one end side of the lock stopper that has expanded in diameter after passing through the inner peripheral portion thereof and restricts movement of the rod in the contraction direction; and An outer periphery of the lock stopper is provided so as to be movable between the first diameter reducing mechanism and one end of the cylinder, and when the rod moves in the extending direction from a position where the lock stopper and the lock portion are in contact with each other. In comprising a second diameter reduction mechanism having a second inner circumferential portion abuts decrease the diameter of the lock stopper passable size of the first inner peripheral portion.

According to the second aspect of the present invention, the cylinder device includes a cylindrical cylinder having a first end and a second end, one end disposed inside the cylinder, and the other end disposed outside the cylinder. And a lock mechanism that locks the rod with respect to the cylinder. In this cylinder device, the lock mechanism is (a) a lock stopper provided on the rod so as to be positioned in the axial direction and having an outer wall portion whose diameter size can be changed, and (b) a lock guide provided on the cylinder. A first inner wall portion that contacts the outer wall portion of the lock stopper to reduce the diameter of the lock stopper when the rod moves in the extending direction, and the lock that has expanded in diameter after passing through the first inner wall portion. A lock guide having a side wall provided so as to face the stopper, wherein the lock stopper and the side wall are in contact with each other to prevent movement of the rod in the contraction direction at the first position; c) An unlock guide disposed in the cylinder so as to be movable in the axial direction. When the rod moves in the extending direction from the first position, the lock guide Contact with the outer wall of Tsu path having a second inner wall portion reduced in diameter of the lock stopper, having a said unlock guide.

According to the aspect of the present invention, it is possible to prevent the lock from being inadvertently released.

It is a longitudinal section of a cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the unlocked state of the cylinder apparatus of one Embodiment which concerns on this invention. It is a fragmentary perspective sectional view showing the unlocking state of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the state before the lock | rock of the cylinder apparatus of one Embodiment which concerns on this invention. It is a fragmentary perspective sectional view showing the state before lock of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the locked state of the cylinder apparatus of one Embodiment which concerns on this invention. It is a fragmentary perspective sectional view showing the locked state of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the 1st step of lock release of the cylinder apparatus of one Embodiment concerning this invention. It is a fragmentary perspective sectional view showing the 1st step of lock release of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the 2nd step of lock release of the cylinder apparatus of one Embodiment concerning this invention. It is a fragmentary perspective sectional view showing the 2nd step of unlocking of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the 3rd step of lock release of the cylinder apparatus of one Embodiment concerning this invention. It is a fragmentary perspective sectional view showing the 3rd step of unlocking of the cylinder device of one embodiment concerning the present invention. It is a fragmentary longitudinal cross-section which shows the unlocking state of the modification of the cylinder apparatus of one Embodiment which concerns on this invention.

An embodiment according to the present invention will be described with reference to the drawings.

FIG. 1 shows a cylinder device 1 according to the present embodiment. The cylinder device 1 is a shock absorber, specifically, a gas stay (gas spring) in which gas is sealed as a working fluid. The cylinder device 1 includes a cylindrical cylinder 10 in which a gas (air or nitrogen gas) and a small amount of lubricating oil are sealed, and an opening 11 at one end in the axial direction (head side) of the cylinder 10. A rod 12 to be partially inserted and a piston 13 fixed to an inner end portion disposed in the cylinder 10 of the rod 12 are provided. The piston 13 is fitted in the cylinder 10 so as to be slidable in the axial direction. The rod 12 fixed to the piston 13 has an axial end projecting from the opening 11 at one end of the cylinder 10 (protrusion amount, projecting length) that is extendable (changeable). The rod 12 is once arranged inside the cylinder 10, and the multi-end is arranged outside the cylinder 10.

The inside of the cylinder 10 is partitioned by a piston 13 into two chambers, a chamber 14 on the opening 11 side and a chamber 15 on the opposite side of the opening 11. When the rod 12 moves together with the piston 13 toward the extending side that increases the amount of protrusion from the cylinder 10, the volume of the chamber 14 decreases and the volume of the chamber 15 increases. On the other hand, when the rod 12 moves together with the piston 13 to the contraction side to reduce the amount of protrusion from the cylinder 10, the volume of the chamber 14 increases and the volume of the chamber 15 decreases.

The cylinder 10 has a substantially cylindrical body portion 20 having an opening 11 at one end in the axial direction, and a bottom portion 21 provided on the body portion 20 so as to close the other end (bottom side) in the axial direction. It has a bottom cylindrical shape. In the body portion 20 of the cylinder 10, an annular annular step portion 23 having a smaller diameter than the other constant-diameter main body portion 22 is formed coaxially at the position of the opening 11 by plastic working. Further, the cylinder 10 has an annular inner projecting portion 24 having a smaller diameter than the main body portion 22 on the bottom portion 21 side of the annular step portion 23, and a smaller diameter than the main body portion 22 on the bottom portion 21 side of the inner projecting portion 24. Both annular inner protrusions 25 are formed coaxially by plastic working. In addition, each inner

side protrusion part

24 and 25 is good also as a processus | protrusion of several places formed at intervals in the circumferential direction instead of making it annular | circular shape.

A mounting bracket 28 is fixed to the bottom 21 of the cylinder 10 so as to extend outward along the axial direction of the cylinder 10. A mounting hole 29 is formed in the mounting bracket 28 so as to penetrate the mounting bracket 28 along the radial direction of the cylinder 10.

A rod guide 31 and a rod seal 32 are provided inside the opening 10 side of the cylinder 10. The rod 12 is inserted into the cylinder 10 through the inside of a rod guide 31 as a slide bearing and the inside of a rod seal 32 that seals the gap between the cylinder 10 and the rod 12.

2 and 3, the rod guide 31 has a stepped cylindrical shape. In the rod guide 31, the largest diameter portion 42 is formed on the outer diameter side at one end in the axial direction. Further, in the rod guide 31, an intermediate diameter portion 43 smaller in diameter than the large diameter portion 42 is formed in the middle in the axial direction, and a small diameter portion 44 smaller in diameter than the intermediate diameter portion 43 is formed in the other end in the axial direction. . The rod guide 31 has a large diameter portion 42 fitted to the main body portion 22 of the cylinder 10, and an intermediate diameter portion 43 aligned with the annular step portion 23 of the cylinder 10 in the axial direction. The rod guide 31 is prevented from coming out of the cylinder 10 by the large diameter portion 42 coming into contact with the annular step portion 23 of the cylinder 10.

The rod seal 32 has an annular shape. The rod seal 32 includes an annular flat plate-like rigid member 52 and a rubber elastic member 53 formed in an annular shape so as to cover the rigid member 52. The elastic member 53 includes a substantially annular base portion 54 in which the rigid member 52 is embedded, an annular inner peripheral lip portion 55 extending from the inner peripheral edge portion of the base portion 54 to one side in the axial direction, and the base portion 54. The outer peripheral lip portion 56 extends from the outer peripheral edge portion to the same side as the inner peripheral lip portion 55, and has a C-shaped radial cross section. In the rod seal 32, the rigid member 52 and the base portion 54 are disposed on the opening 11 side, and the inner peripheral lip portion 55 and the outer peripheral lip portion 56 are disposed on the opposite side of the opening portion 11. As a result, the rod seal 32 always abuts against the rod guide 31 due to the internal pressure in the cylinder 10 and also causes the large-diameter portion 42 of the rod guide 31 to abut against the annular step portion 23 of the cylinder 10 at all times.

Each piston 13 has an annular piston body 61 and a piston seal 62. In the piston main body 61, an annular seal groove 63 is formed in an intermediate portion in the axial direction of the outer peripheral portion. The piston seal 62 has an annular shape, and is fitted in the seal groove 63 to seal the gap between the piston main body 61 and the cylinder 10. A plurality of flow passage holes 65 extending in the axial direction are formed in the piston body 61 at intervals in the circumferential direction.

The rod 12 includes a main shaft portion 71 having a constant diameter, a fitting shaft portion 72 having a smaller diameter than the main shaft portion 71 provided on one end side of the main shaft portion 71, and the opposite side of the main shaft portion 71 of the fitting shaft portion 72. And the crimping portion 73 formed to have a large diameter by plastically deforming the fitting shaft portion 72. The rod 12 has a fitting shaft portion 72 fitted to the inner peripheral portion of the piston 13. The piston 13 is restricted from being pulled out of the rod 12 by a caulking portion 73 having a diameter larger than its inner diameter.

Here, the rod 12 is inserted into the rod guide 31 and the rod seal 32 of the cylinder 10 at the main shaft portion 71, and the rod seal 32 seals the gap between the main shaft portion 71 of the rod 12 and the cylinder 10. The rod guide 31 allows the axial movement while restricting the radial movement of the rod 12. The piston 13 is fitted to the main body portion 22 on the opposite side of the opening portion 11 from the inner projecting portion 25 of the cylinder 10 so as to be movable in the axial direction in a state in which radial movement is restricted. Therefore, the rod 12 and the piston 13 can move in the axial direction while maintaining a coaxial shape with respect to the cylinder 10. Since the rod 12 protrudes from the cylinder 10 (one end of the rod 12 is arranged outside the cylinder), a difference occurs in the pressure receiving area in the cylinder 10 between the rod 12 and the piston 13. The gas reaction force biases the rod 12 in the protruding direction.

As shown in FIG. 1, a mounting bracket 75 is fixed to an end portion of the main shaft portion 71 of the rod 12 that protrudes from the cylinder 10 so as to extend outward along the axial direction of the rod 12. . The mounting bracket 75 is formed with a mounting hole 76 that passes through the mounting bracket 75 along the radial direction of the rod 12.

In this embodiment, a lock mechanism 81 is provided between the piston 13 in the cylinder 10 and the rod seal 32. The lock mechanism 81 locks the rod 12 so as not to move in the contraction direction at a predetermined position on the maximum extension side with respect to the cylinder 10. The lock mechanism 81 is configured to prevent movement of the rod 12 in the contraction direction when the rod 12 exceeds a predetermined position when the rod 12 moves in the extending direction with respect to the cylinder 10.

As shown in FIGS. 2 and 3, the lock mechanism 81 includes a lock case 82, a stopper washer 83, an unlock guide 84 (second diameter reducing mechanism), a rod washer 85, a distance spacer 86, and a spring 87. (Reaction force mechanism) and a lock stopper 88.

The lock case 82 is fitted in the cylinder 10 and is attached to a predetermined position of the cylinder 10 by the inner protrusion 25 so as not to move in the axial direction. The lock case 82 includes a thick cylindrical portion 91 (first diameter reducing mechanism) whose axial position is aligned with the inner protruding portion 25, and a thin cylindrical portion extending from the thick cylindrical portion 91 toward the opening 11 side. 92. The thick cylindrical portion 91 and the thin cylindrical portion 92 have the same outer diameter, and the thick cylindrical portion 91 has a smaller inner diameter than the thin cylindrical portion 92. Therefore, the thick cylindrical portion 91 is thinner. The thickness in the radial direction is thicker than the cylindrical portion 92. In the cylinder 10, two portions (adjacent portions) formed adjacent to the thick-walled cylindrical portion 91 (first diameter reducing mechanism, lock guide) have an inner diameter larger than the inner diameter of the thick-walled cylindrical portion 91. . The adjacent portion has an axial length and an inner diameter that are set such that the diameter of the lock stopper 88 can be increased. The lock case 82 is provided at a position spaced from the opening 11 at one end (first end) of the cylinder 10 toward the other end (second end).

The thick cylindrical portion 91 has a cylindrical surface in which the inner peripheral surface of the inner peripheral portion 93 (first inner peripheral portion, first inner wall portion) is coaxial with the cylinder 10. The thick cylindrical portion 91 is formed with an intermediate step portion 94 (lock portion, side wall portion) positioned in the middle in the axial direction of the lock case 82 on the thin cylindrical portion 92 side in the axial direction. The end surface (side surface) on the opening 11 side of the intermediate step portion 94 is a flat surface disposed on a surface orthogonal to the central axis of the cylinder 10, and the end surface (side surface) on the opposite side to the opening portion 11 of the thick cylindrical portion 91. ) Is also a flat surface arranged on a surface orthogonal to the central axis of the cylinder 10. The main shaft portion 71 of the rod 12 is inserted inside the lock case 82. In the lock case 82, the inner diameter of the thick cylindrical portion 91 that is the minimum inner diameter is larger than that of the main shaft portion 71 of the rod 12.

The stopper washer 83 is an annular flat plate and is fitted in the cylinder 10. The stopper washer 83 is sandwiched between the inner projecting portion 24 of the cylinder 10 and the lock case 82, and is thereby attached to the cylinder 10 so as not to move in the axial direction. The stopper washer 83 is inserted with the main shaft portion 71 of the rod 12 inside. The inner diameter of the stopper washer 83 is larger than the main shaft portion 71 of the rod 12. Further, the inner diameter of the stopper washer 83 is smaller than the inner diameter of the thick cylindrical portion 91 of the lock case 82.

The unlock guide 84 has a cylindrical shape, and is slidably provided on the inner peripheral surface of the thin cylindrical portion 92 of the lock case 82 with the main shaft portion 71 of the rod 12 inserted therethrough. The unlock guide 84 is disposed inside the cylinder 10 and is movable in the axial direction between the thick cylindrical portion 91 and the stopper washer 83. The unlock guide 84 is shorter than the thin cylindrical portion 92 of the lock case 82. The unlock guide 84 has an outer diameter smaller than the inner diameter of the thin cylindrical portion 92 and an inner diameter larger than the main shaft portion 71 of the rod 12. The unlock guide 84 has an outer diameter larger than the inner diameter of the thick cylindrical portion 91 and the inner diameter of the stopper washer 83, and the positions of the unlock guide 84 that contact the thick cylindrical portion 91 and the stopper washer 83 move in the axial direction. This is the limit position. In other words, the unlock guide 84 is provided on the outer peripheral side of the rod 12 so as to be movable between the thick cylindrical portion 91 of the lock case 82 and the opening 11 at one end of the cylinder 10.

In the unlock guide 84, the inner peripheral surface of the inner peripheral portion 101 (second inner peripheral portion, second inner wall portion) mainly has a cylindrical surface portion 101a, and the axially thick cylindrical portion 91 side of the inner peripheral surface is provided. A tapered surface portion 101b having a larger diameter toward the thick cylindrical portion 91 side is formed at the end portion. The unlock guide 84 is a flat surface in which both end faces in the axial direction are arranged on a plane orthogonal to the central axis of the unlock guide 84. A plurality of through holes 102 penetrating in the axial direction are formed in the unlock guide 84 at intervals in the circumferential direction. In the unlock guide 84, the diameter of the cylindrical surface portion 101 a of the inner peripheral portion 101 that is the minimum inner diameter is smaller than the inner diameter of the inner peripheral portion 93 of the thick cylindrical portion 91 that is the minimum inner diameter of the lock case 82. Further, the maximum diameter of the tapered surface portion 101 b that is the maximum inner diameter of the inner peripheral surface of the inner peripheral portion 101 is larger than the inner diameter of the inner peripheral portion 93 of the thick-walled cylindrical portion 91.

The rod washer 85 contacts the end surface of the main shaft portion 71 on the fitting shaft portion 72 side in a state where the fitting shaft portion 72 of the rod 12 is inserted inside. The rod washer 85 has an annular flat plate shape, and its outer diameter is smaller than these minimum inner diameters so that it can pass through the lock case 82 and the unlock guide 84. On the other hand, the outer diameter of the rod washer 85 is larger than the inner diameter of the stopper washer 83 so that the axial movement is restricted by contacting the stopper washer 83.

The distance spacer 86 has a stepped cylindrical shape, and is disposed on the opposite side of the main shaft portion 71 of the rod washer 85 with the fitting shaft portion 72 of the rod 12 inserted therethrough. The piston 13 is disposed on the opposite side of the distance spacer 86 from the rod washer 85, and the rod washer 85, the distance spacer 86 and the piston 13 are sandwiched between the main shaft portion 71 and the crimping portion 73 of the rod washer 85. Thereby, these are fixed to the rod 12 so as not to move in the axial direction.

The distance spacer 86 includes, in order from the axial rod washer 85 side, a small-diameter cylindrical portion 111, a large-diameter cylindrical portion 112 having a longer axial length, and a flange portion having a shorter axial length than the small-diameter cylindrical portion 111. 113. The small diameter cylindrical portion 111, the large diameter cylindrical portion 112, and the flange portion 113 have the same inner diameter, and the large diameter cylindrical portion 112 has a larger outer diameter than the small diameter cylindrical portion 111. Also, the flange portion 113 has a larger outer diameter. The outer diameter of the small-diameter cylindrical portion 111 is smaller than the outer diameter of the rod washer 85. The outer diameter of the large-diameter cylindrical portion 112 is substantially the same as the outer diameter of the rod washer 85, and is smaller than the inner diameter of the thick-walled cylindrical portion 91 so that it can pass through the thick-walled cylindrical portion 91 of the lock case 82. . The outer diameter of the flange portion 113 is larger than the inner diameter of the thick cylindrical portion 91 of the lock case 82.

The spring 87 is a coil spring, and one end in the axial direction is fixed to the flange portion 113 with the large-diameter cylindrical portion 112 of the distance spacer 86 inserted inside. The length of the spring 87 in the natural state is shorter than the length of the large-diameter cylindrical portion 112. The spring 87 has a larger diameter than the inner diameter of the thick cylindrical portion 91 of the lock case 82, and the other end in the axial direction is on the end surface opposite to the thin cylindrical portion 92 of the thick cylindrical portion 91 of the lock case 82. Abutment is possible. That is, the spring 87 comes into contact with the lock case 82 when the piston 13 and the rod 12 are located at a predetermined position on the extension side, and the reaction force in the contraction direction when the piston 13 and the rod 12 further move to the extension side. Is generated. In order to shorten the axial direction, the spring 87 may be a disc spring instead of a coil spring.

The lock stopper 88 has an annular shape, and has a concave portion that is recessed inward in the radial direction between the large-diameter cylindrical portion 112 and the rod washer 85 with the small-diameter cylindrical portion 111 of the distance spacer 86 inserted inside. Has been placed. The lock stopper 88 is restricted from moving in the axial direction beyond the large diameter cylindrical portion 112 and the rod washer 85, and is thus positioned in the axial direction with respect to the rod 12. The lock stopper 88 is fixed at an axial position with respect to the rod 12.

The lock stopper 88 includes an annular spring material 121 and a plurality of arc-shaped hard materials 122 that are intermittently fixed to the spring material 121 in the circumferential direction. The spring material 121 is formed of a spring steel plate, and is provided between the support plate portions 125 shown in FIG. 3 and the adjacent support plate portions 125 arranged on the same cylindrical surface at equal intervals in the circumferential direction. And a semi-cylindrical spring plate 126 protruding radially inward from the support plate 125. In other words, the spring material 121 has a plurality of spring plate portions 126 formed at equal intervals in the circumferential direction. The spring material 121 can be expanded and contracted as a whole in the circumferential direction and the radial direction by expanding and contracting the circumferential width by elastic deformation of the plurality of spring plate portions 126. The lock stopper 88 is configured to be reduced in diameter by a radially inward force from the outside, and to be expanded when the radially inward force is removed. When the diameter is reduced, the spring material 121 provides at least a radially outward force (spring force) to the hard material 122. By changing the elastic force of the spring plate portion 126, it is possible to adjust the force necessary for expansion / contraction.

The hard material 122 is individually fixed to the outer peripheral portions of all the support plate portions 125, and thus a plurality of hard materials 122 are partially provided in the circumferential direction of the spring material 121. The hard material 122 is harder than the spring material 121 made of a spring steel plate, and is made of, for example, a high-speed tool steel material (SKH material). Outer end portions of the hard material 122 in the radial direction of the spring material 121 constitute an intermittent outer peripheral portion (outer wall portion) 131 that is intermittently formed in the circumferential direction of the lock stopper 88. In other words, the intermittent outer peripheral portion 131 of the lock stopper 88 is configured by the outer end portions of a plurality of hard materials 122 that are intermittently arranged in the circumferential direction at equal intervals. Similarly, the extending end portions of the plurality of hard materials 122 positioned on the opening 11 side constitute the axial extending / disconnecting end portions 132 formed intermittently in the circumferential direction of the lock stopper 88. Further, the contraction side end portions on the opposite side of the openings 11 of the plurality of hard materials 122 constitute an axially intermittent contraction side end portion 133 formed intermittently in the circumferential direction of the lock stopper 88. Yes.

When the spring material 121 is in the natural state, that is, when the lock stopper 88 is in the natural state, the intermittent outer peripheral portion 131 of the lock stopper 88 is intermittently connected to the same cylindrical surface centering on the central axis of the spring material 121 in the circumferential direction. And an intermittently tapered surface 131b that is intermittently disposed in the circumferential direction on the same tapered surface centered on the central axis of the spring material 121. In the intermittent outer peripheral portion 131, an intermittent tapered surface portion 131b is formed on the opening 11 side of the intermittent cylindrical surface portion 131a. When the lock stopper 88 is in a natural state, the intermittent extension side end 132 of the lock stopper 88 faces the opening 11 and the intermittent contraction side end 133 faces the opposite side of the opening 11. The end surfaces are respectively arranged on a plane orthogonal to the central axis of the spring material 121.

When the lock stopper 88 is in a natural state, the diameter of the circle connecting the portions closest to the center line of the plurality of spring plate portions 126 is the minimum inner diameter, and this minimum inner diameter is the outer diameter of the small-diameter cylindrical portion 111 of the distance spacer 86. The diameter is larger than the diameter. Thereby, the small diameter cylindrical portion 111 can be inserted inside the lock stopper 88.

Next, the operation of the lock mechanism 81 will be described.

The lock mechanism 81 is in the unlocked state shown in FIGS. 1 to 3 from the state where the rod 12 is located on the most contracted side to the predetermined position on the extended side, and the lock stopper 88 is opened more than the lock case 82. It is arranged on the side opposite to the part 11. In this state, the lock stopper 88 is in a natural state. When the lock stopper 88 is in a natural state, as shown in FIG. 2, the maximum outer diameter of the intermittent outer peripheral portion 131, that is, the diameter of the intermittent cylindrical surface portion 131a, that is, the maximum diameter of the intermittent tapered surface portion 131b is The inner diameter of the inner peripheral portion 93 of the portion 91, that is, the diameter of the inner peripheral surface of the inner peripheral portion 93 is larger. When the lock stopper 88 is in a natural state, the minimum outer diameter of the outer peripheral surface of the intermittent outer peripheral portion 131, that is, the minimum diameter of the intermittent tapered surface portion 131 b is the inner diameter of the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. That is, the diameter is smaller than the diameter of the inner peripheral surface of the inner peripheral portion 93.

When the rod 12 moves in the extending direction, the lock stopper 88 moves in the axial direction integrally with the rod 12. When the rod 12 is positioned at a predetermined position on the extending side, the lock stopper 88 is configured by the hard material 122 from the above dimensional relationship. The intermittent tapered surface portion 131 b of the intermittent outer peripheral portion 131 comes into contact with the end portion on the opposite side of the opening portion 11 of the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. When the rod 12 further moves in the extending direction, the locking stopper 88 that moves in the axial direction integrally with the rod 12 has an intermittent tapered surface 131b of the intermittent outer peripheral portion 131 that is the inner periphery of the thick cylindrical portion 91 of the lock case 82. A reaction force in the diameter reducing direction is received from the portion 93, the diameter is reduced, and the inner peripheral portion 93 of the thick cylindrical portion 91 is fitted as shown in FIGS. The lock stopper 88 is contracted by a radially inward force as a reaction force of the spring force of the spring material 121 by contact with the thick cylindrical portion 91, and the shape of the lock stopper 88 is the inner surface of the thick cylindrical portion 91. Deforms according to the contact surface. In other words, the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82 at least temporarily contacts the intermittent outer peripheral portion 131 of the lock stopper 88 when the rod 12 moves in the extending direction, thereby contracting the lock stopper 88. Let the diameter. The state shown in FIGS. 4 and 5 is a state before the lock mechanism 81 is locked.

When the rod 12 further moves in the extending direction, the lock stopper 88 that moves in the axial direction integrally with the rod 12 is an intermittent cylindrical surface portion 131 a of the intermittent outer peripheral portion 131, and an inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. Slide around the circumference. In this state, the lock stopper 88 has a maximum outer diameter of the intermittent outer peripheral portion 131, that is, a diameter of the intermittent cylindrical surface portion 131a, that is, a maximum diameter of the intermittent tapered surface portion 131b, and a minimum inner diameter of the inner peripheral portion 101 of the unlock guide 84, that is, a tapered surface portion 101b. The diameter is larger than the minimum diameter and smaller than the maximum diameter of the tapered surface portion 101b. Further, the minimum outer diameter of the outer peripheral surface of the intermittent outer peripheral portion 131, that is, the minimum diameter of the intermittent tapered surface portion 131b is smaller than the minimum inner diameter of the inner peripheral portion 101 of the unlock guide 84, that is, the minimum diameter of the tapered surface portion 101b. Further, the angle formed by the center line of the intermittent tapered surface portion 131 b of the lock stopper 88 is smaller than the angle formed by the center line of the tapered surface portion 101 b of the unlock guide 84. Therefore, when the rod 12 further moves in the extending direction, the lock stopper 88 that moves in the axial direction integrally with the rod 12 protrudes from the thick cylindrical portion 91 toward the opening 11, and the intermittent tapered surface portion 131 b of the intermittent outer peripheral portion 131. Contacts the inner end of the tapered surface portion 101b of the unlock guide 84 and presses the unlock guide 84 toward the stopper washer 83 side. Then, the unlock guide 84 also moves in the extending direction together with the rod 12 and the lock stopper 88.

Here, the axial length of the lock stopper 88 is smaller than a value obtained by subtracting the axial length of the unlock guide 84 from the distance between the intermediate step portion 94 of the lock case 82 and the stopper washer 83. Therefore, the lock stopper 88 that moves further in the extending direction of the rod 12 and moves in the axial direction integrally with the rod 12 has an inner peripheral portion of the thick cylindrical portion 91 of the lock case 82 as shown in FIGS. When the lock stopper 88 comes out of the 93, the diameter of the lock stopper 88 is released between the thick cylindrical portion 91 and the unlock guide 84 due to the spring property of the spring material 121. Return to the natural state. By removing the radially inward force due to contact with surrounding objects, the lock stopper 88 expands in diameter. At this time, the radial size (radial size) of the lock stopper 88 is expanded by the radially outward force (spring force) of the spring material 121 provided to the hard material 122. Here, after the lock stopper 88 enters the inner peripheral portion 93 of the thick cylindrical portion 91, the spring 87 contacts the thick cylindrical portion 91 of the lock case 82 at a timing before passing through the inner peripheral portion 93. Thus, a reaction force is generated for the subsequent movement of the rod 12 in the extending direction.

When the lock stopper 88 returns to the natural state as shown in FIGS. 6 and 7, the maximum diameter of the flat end surface on the opposite side of the opening 11 of the intermittent contraction side end 133 is the intermediate step portion of the lock case 82. The minimum diameter of the flat end surface 94, that is, the inner diameter of the inner peripheral portion 93 is larger. Therefore, the lock stopper 88 has the flat end surface (side surface) of the intermittently contracted side end portion (side portion) 133 abuts on the flat end surface of the intermediate step portion (side wall portion) 94 of the lock case 82 and moves toward the contraction side. Movement is restricted. As a result, the movement of the rod 12 integrated with the lock stopper 88 in the axial direction is also restricted. That is, the lock mechanism 81 is in a locked state in which the rod 12 is locked to the cylinder 10 by the intermediate step portion 94 of the lock case 82. In other words, the intermediate step portion 94 of the lock case 82 is intermittently contracted on one end side constituted by the hard material 122 of the lock stopper 88 whose diameter is increased after passing through the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. Abutting on the side end portion 133 restricts the movement of the rod 12 in the contraction direction. In this state, the side portion 133 and the intermediate step portion (lock portion) 94 of the lock stopper 88 face each other. When the rod 12 attempts to move in the contraction direction, the contact of the side portion 133 of the lock stopper 88 and the intermediate step portion (lock portion) 94 prevents the rod 12 from moving in the contraction direction at a predetermined position (first position). The When in the locked state, the flat stopper surfaces of the lock stopper 88 and the intermediate step portion 94 of the lock case 82 are in contact with each other so that the locked state is not released even if a large force is applied in the contraction direction. . Thus, since the lock stopper 88 contacts the intermediate step portion 94 of the lock case 82 over the entire circumference, the lock force can be dispersed, and the lock force is improved and the durability of the lock stopper 88 is improved. be able to.

Further, when the lock stopper 88 is in a natural state, the minimum diameter of the intermittent tapered surface portion 131b of the intermittent outer peripheral portion 131 is smaller than the maximum diameter of the tapered surface portion 101b of the inner peripheral portion 101 of the unlock guide 84, and the tapered surface portion 101b. The diameter is larger than the minimum diameter. In addition, as described above, the angle formed by the center line of the intermittent tapered surface portion 131b of the lock stopper 88 is smaller than the angle formed by the center line of the tapered surface portion 101b of the unlock guide 84. Therefore, when the rod 12 moves in the extending direction against the urging force of the spring 87 from the locked state, the lock stopper 88 that moves in the axial direction integrally with the rod 12 is an opening portion of the intermittent tapered surface portion 131b of the intermittent outer peripheral portion 131. The unlock guide 84 is moved to the stopper washer 83 side while the end portion on the 11th side is brought into contact with the tapered surface portion 101b of the inner peripheral portion 101 of the unlock guide 84.

When the unlock guide 84 comes into contact with the stopper washer 83 and the movement in the axial direction is restricted, and the rod 12 further moves in the extending direction, the lock stopper 88 that moves in the axial direction integrally with the rod 12 is The intermittent tapered surface portion 131b of the intermittent outer peripheral portion 131 receives a reaction force in the diameter reducing direction from the tapered surface portion 101b of the inner peripheral portion 101 of the unlock guide 84, and the diameter is reduced, as shown in FIGS. Into the inner peripheral portion 101 of the unlock guide 84 and fit. This is the first stage of unlocking the lock mechanism 81. After the lock stopper 88 is fitted to the inner peripheral portion 101 of the unlock guide 84, when the rod 12 further moves in the extending direction, the rod washer 85 abuts against the stopper washer 83 to restrict further movement of the rod 12 in the extending direction. To do. That is, the state in which the rod washer 85 contacts the stopper washer 83 is the maximum extension position of the rod 12.

Here, as described above, the unlock guide 84 has a diameter of the cylindrical surface portion 101 a of the inner peripheral portion 101 that is the minimum inner diameter of the inner peripheral portion 93 of the thick cylindrical portion 91 that is the minimum inner diameter of the lock case 82. Smaller than the inner diameter. For this reason, the amount of diameter reduction of the lock stopper 88 is larger in the amount of diameter reduction by the inner peripheral portion 101 of the unlock guide 84 than in the amount of diameter reduction by the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. . As a result, the maximum outer diameter of the lock stopper 88 fitted to the inner peripheral portion 101 of the unlock guide 84, that is, the diameter of the intermittent cylindrical surface portion 131 a of the intermittent outer peripheral portion 131 is the inner peripheral portion of the thick cylindrical portion 91 of the lock case 82. It becomes smaller than the inner diameter of 93, that is, the diameter of the inner peripheral surface of the inner peripheral portion 93. In other words, when the rod 12 moves in the extending direction from the position (first position) where the lock stopper 88 and the intermediate step portion 94 of the lock case 82 contact each other, the inner peripheral portion 101 of the unlock guide 84 is locked. The lock stopper 88 is brought into contact with the intermittent outer peripheral portion 131 of 88 and the diameter of the lock stopper 88 is reduced to a size that can pass through the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. In other words, in the first stage of unlocking the lock mechanism 81, the outer diameter of the flat end surface opposite to the opening 11 of the lock stopper 88 is set to be larger than the inner diameter of the flat end surface of the intermediate step portion 94 of the lock case 82. Also make it smaller.

After the lock stopper 88 is fitted to the inner peripheral portion 101 of the unlock guide 84 as described above, when the rod 12 moves in the contracting direction, the lock stopper 88 is integrated with the unlock guide 84 fitted thereto. As shown in FIGS. 10 and 11, the unlock guide 84 is brought into contact with the intermediate step portion 94 of the lock case 82. This is the second stage of unlocking the lock mechanism 81.

Here, as described above, the diameter of the intermittent cylindrical surface portion 131a of the intermittent outer peripheral portion 131 of the lock stopper 88 is smaller than the diameter of the inner peripheral surface of the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. When the rod 12 moves in the contracting direction, the lock stopper 88 fitted to the unlock guide 84 enters the inner peripheral portion 93 of the thick cylindrical portion 91.

After the lock stopper 88 fitted to the unlock guide 84 enters the inner peripheral portion 93 of the thick cylindrical portion 91, when the rod 12 further moves in the contracting direction, the lock stopper 88 is moved to FIGS. As shown in the figure, the lock case 82 comes out of the inner peripheral portion 101 of the unlock guide 84 that is in contact with the intermediate step portion 94 and is stopped, and the pressure by the unlock guide 84 is released. The inner periphery 93 of the part 91 is fitted. This is the third stage of unlocking the lock mechanism 81.

When the rod 12 further moves in the contraction direction, the lock stopper 88 comes out of the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82, and the pressure by the inner peripheral portion 93 of the lock case 82 is released, returning to the natural state. . As a result, the lock mechanism 81 enters the unlocked state shown in FIGS.

The cylinder device 1 is a fastening member in which a mounting bracket 28 attached to the cylinder 10 and a mounting bracket 75 attached to the rod 12 are inserted into the mounting

holes

29 and 76, respectively. It is attached to an opening / closing member (not shown) that swings relative to the member. When the mounting direction is used in the case where the opening / closing member is always closed, it is preferable that the rod 12 of the cylinder device 1 be attached so that the protruding side of the cylinder device 1 is downward when the opening / closing member is closed. This is because it is preferable that the oil in the cylinder 10 is in contact with the rod seal 32 as much as possible in order to ensure the sealing performance and the sliding performance.

When the open / close member is in the fully closed state close to the base member, the rod 12 enters the cylinder 10 most. When the open / close member is in the fully open state farthest from the base member, the rod 12 is in the cylinder. 10 most protrudes. Here, since the

chambers

14 and 15 are filled with high-pressure gas, a gas reaction force, which is an urging force in the direction in which the rod 12 protrudes from the cylinder 10, is generated in the piston 13 due to the pressure receiving area difference. Yes. Therefore, in the closed state, the weight of the open / close member is maintained in the closed state over the gas reaction force, or the open / close member is maintained in the closed state by an open / close lock mechanism (not shown) relative to the base member. Further, when the opening / closing member is opened, the opening / closing member is pressed in the opening direction by the gas reaction force to assist the operating force of the opening operation.

When the opening / closing member swings, the piston 13 moves in the cylinder axial direction in the cylinder 10 to change the volume of the

chambers

14 and 15. At this time, the flow of the piston 13 connecting the

chambers

14 and 15 is changed. The passage hole 65 controls the flow of gas and generates a damping force to suppress the swing speed of the opening / closing member.

When the opening / closing member is opened, the rod 12 moves in the extending direction, and when the opening / closing member is opened to near full open, the lock mechanism 81 passes through the pre-lock state shown in FIGS. As shown in FIG. In this locked state, the lock stopper 88 comes out from the thick cylindrical portion 91 of the lock case 82 toward the thin cylindrical portion 92 and expands in diameter. At that time, a click sound is generated to enter the locked state. Notify that. When the lock mechanism 81 is in the locked state, the spring 87 generates a reaction force with respect to the movement of the rod 12 in the extending direction, and generates a reaction force with respect to the further movement of the opening / closing member in the opening direction.

After the lock mechanism 81 is in the locked state, for example, when an operator puts a load on the opening / closing member and the mass of the opening / closing member increases, the gas pressure in the cylinder 10 decreases, or the like. When the force is reduced, the opening / closing member tries to move in the closing direction and tries to move the rod 12 of the cylinder device 1 in the contracting direction. However, the lock mechanism 81 in the locked state maintains the open / close member in the open state because the lock stopper 88 abuts against the intermediate step portion 94 of the lock case 82 and restricts the movement of the rod 12 in the contraction direction.

In this state, when closing the opening / closing member, the operator temporarily moves the opening / closing member in the opening direction with the intention of closing the opening / closing member. At this time, in the cylinder device 1, the rod 12 moves in the extending direction while contracting the spring 87, and the operator moves the opening / closing member in the opening direction against the urging force of the spring 87. become. Then, the lock mechanism 81 is the first stage of unlocking shown in FIGS. 8 and 9 and restricts further movement of the opening / closing member in the opening direction. This position is the fully open position of the opening / closing member. Thereafter, when the opening / closing member is moved in the closing direction, the lock mechanism 81 enters the second stage of unlocking shown in FIGS. 10 and 11, and further enters the third stage shown in FIGS. The unlocked state shown in FIG. 3 is entered, and the further closing operation of the opening / closing member is allowed. Here, in the present embodiment, the configuration in which the reaction force is generated on the rod by providing the spring 87 is shown, but the elastic force of the spring plate portion 126 of the lock stopper 88 is changed in place of the spring 87. By doing so, it is possible to prevent the lock from being inadvertently released by increasing the resistance when inserting it into the unlock guide 84. In other words, the spring 87 can be eliminated by increasing the force required to expand and contract the lock stopper 88.

When the lock mechanism 81 changes from the pre-lock state shown in FIGS. 4 and 5 to the lock state shown in FIGS. 6 and 7, the cylinder device 1 has a posture in which the rod 12 protrudes downward from the cylinder 10. Then, the unlock guide 84 is separated from the lock stopper 88 in the axial direction by its own weight. Therefore, when the locked state shown in FIGS. 6 and 7 is obtained, the unlock guide 84 can be separated from the lock stopper 88 whose diameter is increased. Accordingly, the diameter of the lock stopper 88 can be smoothly expanded to be in a locked state.

On the other hand, when the lock mechanism 81 changes from the pre-lock state shown in FIGS. 4 and 5 to the lock state shown in FIGS. 6 and 7, the cylinder device 1 is in a posture to project the rod 12 upward from the cylinder 10. In this case, the unlock guide 84 cannot be separated from the lock stopper 88 by its own weight. In this case, as shown in FIG. 14, a spring 150 (a biasing member) that biases the unlock guide 84 toward the opening 11 at one end of the cylinder 10 is provided, and the unlock guide 84 is locked to the lock case 82. The stopper washer 83 is kept in contact with the intermediate step portion 94. With this configuration, when the locked state is established, the unlock guide 84 can be forcibly separated from the lock stopper 88 that expands in diameter, and the lock stopper 88 smoothly expands in diameter and enters the locked state. be able to.

In the cylinder device described in Patent Literature 1 described above, the rod is locked in the extended state by fitting a retaining ring provided on the cylinder side sleeve into the annular groove of the bush fixedly disposed on the rod. It is like that. When a force of a predetermined value or more is applied to the rod in the contracting direction, the bushing is released from the retaining ring, the lock is released, and the rod is contracted. Thus, since the input direction at the time of unlocking is the contraction direction of the rod, the lock may be inadvertently released.

On the other hand, in this embodiment, when the rod 12 moves in the extending direction, the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82 becomes the intermittent outer peripheral portion 131 of the lock stopper 88 provided on the rod 12. The diameter of the lock stopper 88 is reduced by contact. When the rod 12 further moves in the extending direction and passes through the inner peripheral portion 93 and then increases in diameter, the intermediate step portion 94 of the lock case 82 comes into contact with the intermittent contraction side end portion 133 on one end side of the lock stopper 88. It will be in the state which controls the movement of the contraction direction of the rod 12. FIG. That is, the cylinder 10 is in a locked state in which the movement of the rod 12 in the contraction direction is restricted. When the rod 12 further moves in the extending direction from this state, the inner peripheral portion 101 of the unlock guide 84 comes into contact with the intermittent outer peripheral portion 131 of the lock stopper 88 so that the lock stopper 88 is made thicker. The inner diameter portion 93 of the cylindrical portion 91 is reduced in diameter so that it can pass through. Thereafter, when the rod 12 moves in the contracting direction, the lock stopper 88 passes through the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82. Thus, at the time of unlocking, it is necessary to temporarily move the rod 12 in the extending direction opposite to the contracting direction, so that it is possible to prevent the lock from being inadvertently released. In addition, since the lock can be released without relatively rotating the rod 12 and the cylinder 10, the operability of unlocking is improved.

Further, when the lock stopper 88 passes through the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82 and the rod 12 is locked with respect to the cylinder 10, the spring 87 generates a reaction force against the movement of the rod 12 in the extending direction. Let Therefore, when the lock is released, it is necessary to temporarily move the rod 12 in the extending direction against the reaction force of the spring 87, so that it is possible to further prevent the lock from being inadvertently released.

Further, since the amount of diameter reduction of the lock stopper 88 by the inner peripheral portion 101 of the unlock guide 84 is larger than the amount of diameter reduction of the lock stopper 88 by the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82, The lock stopper 88 reduced in diameter by the inner peripheral portion 101 of the unlock guide 84 smoothly enters the inner peripheral portion 93 of the thick cylindrical portion 91 of the lock case 82 and can pass therethrough.

The lock stopper 88 includes a spring material 121 that can be expanded and contracted in the radial direction, and a plurality of hard materials 122 that are partially provided in the circumferential direction of the spring material 121 and abut against the intermediate step portion 94 of the lock case 82. Therefore, the diameter can be increased and reduced satisfactorily.

Further, if a spring 150 is provided to urge the unlock guide 84 toward the opening 11 side at one end of the cylinder 10, the lock mechanism 81 is moved from the pre-lock state shown in FIGS. 4 and 5 to FIGS. Even when the cylinder device 1 is in a posture of projecting the rod 12 upward from the cylinder 10 when the locked state shown in FIG. I can leave. Therefore, the diameter of the lock stopper 88 can be smoothly expanded to be in a locked state.

The present embodiment described above is a cylinder device having a cylindrical cylinder, a rod having one end projecting from one end of the cylinder so as to extend and contract, and a lock mechanism for locking the rod with respect to the cylinder. The lock mechanism is provided by being axially positioned on the rod and provided with a lock stopper capable of reducing the diameter with a spring property in the diameter increasing direction, and a position spaced from one end to the other end of the cylinder. When the rod moves in the extending direction, the first inner peripheral portion that abuts on the outer peripheral portion of the lock stopper to reduce the diameter of the lock stopper, and the diameter is increased after passing through the first inner peripheral portion. A first diameter-reducing mechanism having a lock portion that contacts one end of the lock stopper and restricts movement of the rod in the shrinking direction; and the first diameter-reducing mechanism on the outer peripheral side of the rod; When the rod moves in the extending direction from the position where the lock stopper and the lock portion are in contact with each other, the lock stopper comes into contact with the outer periphery of the lock stopper. And a second diameter-reducing mechanism having a second inner peripheral portion that reduces the diameter to a size that can pass through the first inner peripheral portion. When the lock is released, an operation for temporarily moving the rod in the extending direction opposite to the contracting direction is required, so that the lock can be prevented from being inadvertently released. Moreover, since the lock can be released without rotating the rod and the cylinder relative to each other, the operability of unlocking is improved.

Further, it has a reaction force mechanism that generates a reaction force against the movement of the rod in the extending direction after the lock stopper has passed through the first inner peripheral portion. When the lock is released, it is necessary to temporarily move the rod against the reaction force of the reaction force mechanism in the extension direction opposite to the contraction direction, so that it is possible to further prevent the lock from being inadvertently released.

Further, the diameter of the lock stopper by the second diameter reducing mechanism is larger than the diameter of the lock stopper by the first diameter reducing mechanism. Therefore, the lock stopper reduced in diameter by the second diameter reduction mechanism can smoothly pass through the first diameter reduction mechanism.

In addition, the lock stopper includes a spring material that can be expanded and contracted in the radial direction and a plurality of hard materials that are partially provided in the circumferential direction of the spring material and come into contact with the lock portion, so that the diameter of the lock stopper can be increased and decreased. It becomes.

Further, since the biasing member for biasing the second diameter reducing mechanism toward the one end side of the cylinder is provided, the lock stopper after passing through the first diameter reducing mechanism smoothly expands to a locked state. Can be.

DESCRIPTION OF SYMBOLS 1 Cylinder apparatus 10 Cylinder 11 Opening part of one end 12 Rod 81 Lock mechanism 84 Unlock guide (2nd diameter reduction mechanism)
87 Spring (Reaction force mechanism)
88 Lock stopper 91 Thick cylindrical part (first diameter reduction mechanism, lock guide)
93 Inner circumference (first inner circumference, first inner wall)
94 Intermediate step (lock, side wall)
101 Inner circumference (second inner circumference, second inner wall)
121 Spring material 122 Hard material 131 Intermittent outer peripheral part (outer peripheral part, outer wall part)
150 Spring (biasing member)

Claims

A cylindrical cylinder;
A rod having one end projecting from one end of the cylinder so as to extend and contract;
A locking mechanism for locking the rod with respect to the cylinder;
A cylinder device comprising:
The locking mechanism is
A lock stopper that is positioned in the axial direction on the rod and has a spring property in the diameter-enlarging direction and can be reduced in diameter;
A first inner peripheral portion that is provided at a position spaced from one end of the cylinder to the other end side, and contacts the outer peripheral portion of the lock stopper to reduce the diameter of the lock stopper when the rod moves in the extending direction; And a first diameter-reducing mechanism having a lock portion that abuts on one end side of the lock stopper that has been expanded after passing through the first inner peripheral portion and restricts movement of the rod in the contraction direction;
The rod is provided on the outer peripheral side of the rod so as to be movable between the first diameter reducing mechanism and one end of the cylinder, and the rod moves in the extending direction from a position where the lock stopper and the lock portion are in contact with each other. A second diameter-reducing mechanism having a second inner peripheral portion that contacts the outer peripheral portion of the lock stopper and reduces the diameter of the lock stopper to a size that can pass through the first inner peripheral portion;
A cylinder device comprising:
2. The cylinder device according to claim 1, further comprising a reaction force mechanism that generates a reaction force with respect to movement of the rod in the extending direction after the lock stopper has passed through the first inner peripheral portion.
3. The cylinder device according to claim 1, wherein a diameter reduction amount of the lock stopper by the second diameter reduction mechanism is larger than a diameter reduction amount of the lock stopper by the first diameter reduction mechanism.
The said lock stopper is provided with the spring material which can be expanded / contracted to radial direction, and the some hard material which is provided in the circumferential direction of the said spring material partially, and contact | abuts to the said lock part. 4. The cylinder device according to any one of 3.
The cylinder device according to any one of claims 1 to 4, further comprising an urging member that urges the second diameter-reducing mechanism toward one end of the cylinder.
A cylindrical cylinder having a first end and a second end;
A rod having one end arranged inside the cylinder and the other end arranged outside the cylinder;
A locking mechanism for locking the rod with respect to the cylinder;
A cylinder device comprising:
The locking mechanism is
A lock stopper having an outer wall portion that is provided in the rod in an axially-positioned manner and has a variable diameter size;
A lock guide provided in the cylinder; a first inner wall portion that abuts on the outer wall portion of the lock stopper to reduce the diameter of the lock stopper when the rod moves in the extending direction; and And a side wall provided so as to face the lock stopper whose diameter is increased after passing, and the contact of the lock stopper and the side wall prevents movement of the rod in the contraction direction at the first position. The lock guide;
An unlock guide disposed in the cylinder so as to be movable in the axial direction. When the rod moves in the extending direction from the first position, the lock stopper comes into contact with the outer wall portion of the lock stopper. The unlock guide having a second inner wall portion for reducing the diameter;
A cylinder device comprising:
The cylinder device according to claim 6, further comprising a reaction force mechanism that generates a reaction force against the movement of the rod in the extending direction after the lock stopper has passed through the first inner wall portion.
The cylinder device according to claim 6 or 7, wherein a diameter reduction amount of the lock stopper by the unlock guide is larger than a diameter reduction amount of the lock stopper by the lock guide.
The said lock stopper is provided with the spring material which can be expanded / contracted in radial direction, and the some hard material which is provided in the circumferential direction of the said spring material partially, and contact | abuts to the said lock part. The cylinder device according to any one of 8.
The cylinder device according to any one of claims 6 to 9, further comprising a biasing member that biases the unlock guide toward the first end of the cylinder.