KR101459881B1 - Cylinder apparatus - Google Patents

Abstract

An object of the present invention is to provide a cylinder device capable of improving the operability of the unlocking operation.
A projection 81 provided on the peripheral surface of the cylinder side member 79 and extending in the radial direction and a projection 81 provided on the circumferential surface of the rod 12, A maximum length contact portion 115 extending in the circumferential direction to be contacted with the protrusion 81 and partially protruding in the circumferential direction so as to oppose the maximum length contact portion 115 in the axial direction, A lock portion 95, 100, 105 which restricts the movement of the rod 12 in the downward direction when the rod 12 reaches the maximum protruding state, 101, 106, 107, 111, 112 provided so as to be spaced apart from each other in the axial direction from the maximum length contacting portion 115 so as to be guided to a position opposite to the maximum length contacting portion 115. [

Description

CYLINDER APPARATUS

The present invention relates to a cylinder apparatus.

In the cylinder device, when the rod is protruded from the cylinder to the maximum, there is a lock state in which the rod is automatically restrained from moving in the direction of insertion into the cylinder (see, for example, Patent Document 1).

Patent Document 1: JP-A-50-54775

In the above-described cylinder device, as the unlocking operation, an operation of pushing the rod against the urging force is required, resulting in a problem that the operability is poor.

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

In order to achieve the above object, a cylinder device of the present invention comprises: a protrusion provided on either a circumferential surface of a cylinder-side member or a circumferential surface of a rod-side member and extending in a radial direction; A maximum length contact portion provided on the other of the circumferential surface of the cylinder side member or the circumferential surface of the rod side member and extending in the peripheral direction in which the projection comes in contact with the rod when the rod reaches the maximum protruding state, A lock portion that is partially provided in a circumferential direction so as to face the direction of the rod and restricts the rod from moving in the reduction direction when the length is reduced and the projection is in contact therewith; And the maximum length of the maximum length contact portion is determined so as to guide the projection to a position facing the lock portion in the circumferential direction of the maximum length contact portion, Contact portion and has a configuration having a guide portion is provided spaced apart in the axial direction.

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

1 is a front view showing a section of a cylinder apparatus according to a first embodiment of the present invention.
Fig. 2 is a partially enlarged sectional view showing the cylinder apparatus of the first embodiment according to the present invention. Fig.
3 is an exploded view showing an example of an extension portion and a projection locus of the cylinder apparatus according to the first embodiment of the present invention.
Fig. 4 is an exploded view showing an example of an extension part and a projection locus of the cylinder apparatus according to the second embodiment of the present invention. Fig.
Fig. 5 is an exploded view showing an example of an extension portion and a projection locus of the cylinder apparatus according to the third embodiment of the present invention. Fig.
Fig. 6 is an exploded view showing an example of an extension part and a projection locus of the cylinder apparatus according to the fourth embodiment of the present invention. Fig.
Fig. 7 is a partially enlarged sectional view showing the cylinder apparatus of the fifth embodiment according to the present invention. Fig.

≪ First Embodiment >

A first embodiment according to the present invention will be described with reference to Figs.

Fig. 1 shows a cylinder apparatus according to the first embodiment. This cylinder apparatus is a shock absorber, specifically, a gas stay (gas spring) in which a gas is sealed as a working fluid. This cylinder device comprises a cylindrical cylinder 11 in which a small amount of oil for gas (air or nitrogen gas) and lubricating oil is sealed, a rod 12 into which one end is inserted at one end of the cylinder 11, And a piston 13 fixed to one end of the rod 11 in which the rod 12 is disposed. The piston 13 is slidably fitted in the cylinder 11 and the piston 13 is connected to the lower side of the cylinder 11 opposite to the rod 14 and the rod 12 on the rod 12 side And is divided into two chambers of a chamber (15).

The cylinder 11 has a substantially cylindrical body portion 20 and a substantially bottomed cylindrical body 22 having a bottom portion 21 fixed to the body portion 20 so as to close one end ). The cylinder body 22 is provided with an annular stepped portion 26 having a smaller diameter than that of the main body portion 25 having a constant diameter at the position of the opening portion 23 opposite to the bottom portion 21 of the body portion 20 Are formed coaxially by plastic working. Two annular inner projections 27 and 28 of smaller diameter than the main body 25 are formed on the bottom 21 side of the annular step 26 in the cylinder body 22 by plastic working As shown in Fig. The cylinder body 22 is formed with a plurality of engaging protrusions 29 protruding inward in the radial direction at positions between the two inner protrusions 27, The inner protrusions 27 and 28 may be protrusions at a plurality of positions in the circumferential direction similarly to the engaging protrusions 29. [

The cylinder 11 has a screw member 31 fixed to the bottom portion 21 of the cylinder body 22 so as to protrude outward along the axial direction and a mounting bracket 32 And is rotatably attached. The mounting bracket 32 has an attachment plate portion 34 in which an attachment hole 33 is formed and a holding plate portion 35 rising vertically from one end of the attachment plate portion 34. The holding plate portion 35 And an insertion hole 36 through which the screw member 31 is inserted is formed. The bearing 38, the holding plate portion 35 of the mounting bracket 32 and the bearing 39 are arranged in this order from the bottom portion 21 side of the cylinder body 22 so that the screw member 31 is inserted therethrough And a nut 40 is screwed to the screw member 31 so as to sandwich these between the bottom portions 21. The mounting bracket 32 is attached to the cylinder 11 with the mounting plate portion 34 disposed on the side opposite to the bottom portion 21 of the holding plate portion 35. Although the bearings 38 and 39 are shown as ball bearings, the mounting bracket 32 may be rotatable with respect to the cylinder body 22, or a slide bearing such as a resin may be used.

The cylinder 11 has a rod guide 45, a seal ring 46 and a retaining ring 47 which are disposed on the inner side of the opening 23 side of the cylinder body 22, Is inserted into the cylinder (11).

As shown in Fig. 2, the rod guide 45 has an annular shape in which a through hole 50 along the axial direction is formed at the center. The insertion hole 50 is a slide bearing. The outer diameter side of the rod guide 45 is formed with a large diameter portion 51 having the largest diameter at one end in the axial direction and a middle diameter portion 52 having a smaller diameter than the large diameter portion 51 is formed in the middle in the axial direction, And a small diameter cylindrical portion 53 having a smaller diameter than the intermediate diameter portion 52 is formed at the other end in the axial direction.

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

The retaining ring 47 has an annular shape in which the insertion hole 60 along the axial direction is formed at the center. The retaining ring 47 is disposed in the main body portion 25 of the cylinder body 22 so as to contact the inner projecting portion 27 on the side of the opening 23 from the side of the opening 23, A seal ring 46 is disposed on the opening 23 side with the groove 58 facing the retaining ring 47 side. A rod guide 45 is disposed on the side of the opening 23 of the seal ring 46 with the large diameter portion 51 facing the seal ring 46. The large diameter portion 51 of the rod guide 45 is engaged with the annular step portion 26 of the cylinder body 22 from the side opposite to the axial seal ring 46, The seal ring 46 and the retaining ring 47 are attached to the cylinder body 22 with the inner projecting portion 27 and the annular stepped portion 26 sandwiched therebetween. In the case where 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 formed at the center thereof with an engagement hole 62 extending in the axial direction and an axial recessed portion 63 is formed at one axial end side to surround the engagement hole 62 Respectively. A plurality of flow path holes 64 are formed in the bottom surface of the positioning recess 63 in parallel with the fitting hole 62. [

The rod 12 has a main shaft portion 68 of a predetermined diameter and a fitting shaft portion 69 provided on one end side of the main shaft portion 68 and smaller in diameter than the main shaft portion 68, And a caulking portion 70 formed in a large diameter by plastically deforming the fitting shaft portion 69 on the side opposite to the main shaft portion 68. [ The rod 12 is engaged with the engaging hole 62 of the piston 13 on the side opposite to the positioning concave portion 63 and the piston 12 of the engaging shaft portion 69 is engaged with the piston 13 And the projecting portion is caulked so as to be held in the placement recess 63, so that the caulking portion 70 is formed. The piston 13 is sandwiched between 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, and the seal ring 46 is inserted into the rod 12 to seal the gap between the main body portion 68 of the cylinder body 22 and the main body portion 25 of the cylinder body 22. The piston 13 is fitted to the main body portion 25 deeper than the inner side projection 28 on the depth side of the cylinder body 22 so as to be relatively rotatable and movable in the axial direction, Is relatively rotatable with respect to the cylinder 11 and is movable in the axial direction. Further, it is preferable that the outer circumferential surface of the piston 13 is resin-processed, and a seal may be provided. As the rod 12 protrudes from the cylinder 11, there is a difference in the hydraulic pressure area in the cylinder 11 of the rod 12 and the piston 13 so that the piston 13 and the rod 12 are displaced, In the projecting direction.

1, a mounting bracket 73 is fixed to the other end of the rod 12 main shaft portion 68 projecting from the cylinder 11. As shown in Fig. The mounting bracket 73 has an attachment plate 75 on which an attachment hole 74 is formed and a holding plate 76 rising vertically from one end of the attachment plate 75, There is formed an insertion hole 77 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 while the mounting plate portion 75 is disposed on the side opposite to the rod 12 of the holding plate portion 76.

As shown in Fig. 2, in the first embodiment, a cylinder-side member 79 made of a substantially cylindrical metal is fitted and fixed in the cylinder body 22. As shown in Fig. The cylinder side member 79 is engaged with the main body portion 25 of the cylinder body 22 in a state sandwiched between the inner side projections 27 on both sides of the cylinder body 22, (22), i.e., the cylinder (11) in the axial direction. The cylinder side member 79 is provided with a plurality of engaging recesses 80 that are concaved in the radial direction at a central position in the axial direction of the outer peripheral surface of the cylinder side member 79 at intervals in the circumferential direction, The rotation of the cylinder body 22 is regulated by engaging the engaging protrusions 29 of the cylinder body 22 with each other.

The inner circumferential surface of the cylinder side member 79 which is either the circumferential surface of the cylinder side member 79 or the circumferential surface of the rod 12 is provided with a protrusion (not shown) extending in the radial direction of the cylinder 11 81, that is, two, specifically, 180 degrees in the circumferential direction of the inner peripheral surface. These protrusions 81 are in a columnar shape along the radial direction of the cylinder body 22 and are disposed between the piston 13 and the retaining ring 47. These projections 81 are provided with two coaxial fitting holes 82 in the cylinder side member 79 along the radial direction and a columnar pin 83 is inserted into these fitting holes 82, By inserting the pin 83 so as to protrude inward from the protruding portion 79. The cylinder side member 79 constitutes the cylinder side member of the present invention. Further, the pin 83 is loosely fitted to the fitting hole 82 so as to be rotatable.

The outer circumferential surface of the rod 12 which is the other of the circumferential surface of the cylinder side member 79 opposed to the circumferential surface provided with the projection 81 and the circumferential surface of the rod 12 protrudes along the radial direction of the rod 12 As shown in Fig. 3, five types of extension portions 85, 86, 87, 88 and 89 are arranged in two phases, 180 degrees in the direction of the rod periphery (left and right direction in Fig. 3) Respectively. Each of the two sets of the extension portions 85 to 89 is in contact with the outer peripheral surface of the projection 81 and guides the same. These two sets of extensions 85 to 89 are formed by cutting, for example, at the time of cutting the rod 12, and are integrally formed with the rod 12. In the present embodiment, the rod 12 itself constitutes the rod-side member of the present invention. The rod 12 is relatively rotatable with the cylinder-side member 79 fixed to the cylinder 11, and thus is also relatively rotatable with respect to the cylinder 11. [

One of the extensions 85 to 89 will be described. In the following description, the same group is used when no other group is described. As shown in Fig. 2, the extension portion 85 is disposed on the insertion side of the rod 12 of the rod 12, that is, on the reduction side in the rod axis direction among the extension portions 85 to 89. In other words, the expanding portion 85 is disposed on the lower side of the opening 23 of the cylinder 11. [

As shown in Fig. 3, the extending portion 85 extends in the rod circumferential direction (right and left direction in Fig. 3), and extends in the rod axis direction (vertical direction in Fig. 3) And a releasing position concave surface 92a which is a curved surface concave on the downward side in the rod axis direction (lower side in Fig. 3) at one end position in the rod circumferential direction of the flat surface 91a And a lock position concave surface 93a formed of a curved surface that is shallower than the release position concave surface 92a on the reduced side in the rod axis direction at an intermediate position between the flat surface 91a. The side opposite to the flat surface 91a of the releasing position concave surface 92a is connected to the flat surface 91a of the other set and the side opposite to the releasing position concave surface 92a of the flat surface 91a, And is connected to the concave surface 92a. The release position concave surface 92a and the lock position concave surface 93a have an arc shape larger than the diameter of the projection 81 and have a phase difference of 90 degrees in the circumferential direction of the rod.

As shown in Fig. 2, the extension portions 86 and 87 are arranged on the projecting side of the rod 12 from the cylinder 11, that is, on the extension side in the rod axis direction. In other words, the extension portions 86 and 87 are disposed closer to the opening 23 of the cylinder 11 than the extension portion 85. [ As shown in Fig. 3, the extending portions 86 and 87 are symmetrical about the lock position concave surface 93a in the rod circumferential direction.

The enlarged portion 86 has a substantially triangular shape, and the reduced side (the lower side in Fig. 3) in the rod axis direction is a concave surface 95a having a curved surface concave toward the extension side in the rod axis direction. The inclined surface 96a is inclined so that the extension in the direction of the rod axis is located on the reduced side (the side of the extension 85) in the rod axis direction toward the lock position concave surface 93a in the rod circumferential direction. The surface 97a connecting the opposite surfaces of the concave surface 95a and the inclined surface 96a with respect to the lock position concave surface 93a in the rod circumferential direction is along the direction of the rod axis, The flat surface 91a side of the release position concave surface 92a is disposed. The surface 97a of the extending portion 86 is disposed in the inner range of the releasing position concave surface 92a and the end of the extending portion 86 opposite to the surface 97a is located at the lock position And is disposed outside the concave surface 93a. The concave surface 95a has a larger diameter than the diameter of the protrusion 81 and the width of the concave surface 95a in the rod circumferential direction is wider than the diameter of the protrusion 81. [

The enlarged portion 87 has a substantially triangular shape and has a concave surface 100a having a curved surface concave toward the extension side in the rod axis direction on the reduced side (lower side in Fig. 3) in the rod axis direction. The inclined surface 101a is inclined so that the extension in the rod axis direction is located on the side of the reduction in the rod axis direction (extension portion 85 side) as the lock position concave surface 93a side in the rod circumferential direction. The surface 102a connecting the opposite sides of the concave surface 100a and the inclined surface 101a with respect to the lock position concave surface 93a in the rod circumferential direction is along the direction of the rod axis, The side of the flat surface 91a opposite to the releasing position concave surface 92a is disposed on the side opposite to the flat surface 91a of the other releasing position concave surface 92a. The surface 102a of the extending portion 87 is arranged in the inner range of the releasing position concave surface 92a of the other group in the rod circumferential direction and the end portion of the extending portion 87 opposite to the surface 102a is And is disposed outside the lock position concave surface 93a. The concave surface 100a has a larger diameter than the diameter of the protrusion 81 and the width of the concave surface 100a in the rod circumferential direction is wider than the diameter of the protrusion 81. [

The expansion portion 88 is disposed on the extension side in the direction of the rod axis (on the side opposite to the extension portion 85) from the extension portions 86 and 87, and the lock position concave surface 93a and the position It is fitting. The enlarged portion 88 is formed in a substantially regular triangle, and its reduced side in the rod axis direction is a concave surface 105a formed of a curved surface concave toward the extension side in the rod axis direction. The pair of inclined surfaces 106a and 107a are inclined so that the extension side in the rod axis direction is positioned on the extension side in the rod axis direction toward the inner side in the rod circumferential direction. The inclined surfaces 106a and 107a have the same angle with respect to the rod axis direction and have the same height in the rod axis direction. Therefore, the inclined surfaces 106a and 107a form a line-symmetrical shape with respect to a line along the rod axis direction through an angle (corner portion) therebetween. These leg portions are aligned with the center of the lock position concave surface 93a of the extended portion 85 in the rod circumferential direction.

The end of the extension 88 on the extension 86 side is disposed on the extension 87 side of the extension of the extension 86 in the rod circumferential direction, And the end on the side of the extension portion 87 is disposed on the extension portion 86 side of the inside range of the extension portion 87. [ The center of the rod circumferential direction is coincident with the center of the lock position concave surface 93a and overlaps the entire range of the lock position concave surface 93a in the circumferential direction of the rod. The concave surface 105a has a larger diameter than the diameter of the protrusion 81 and the width of the concave surface 105a in the rod circumferential direction is wider than the diameter of the protrusion 81. [ The concave surface 105a has a length in the circumferential direction of the rod longer than the circumferential length of the lock position concave surface 93a in the circumferential direction of the rod and the protrusion 81 fitted to the concave lock surface 93a, Direction in the direction of the rod axis.

The extended portion 89 is slightly displaced from the extension portion 88 in the direction of the rod axis (the side opposite to the extended portion 85), and the position of the release position concave surface 92a and the position It is fitting. The enlarged portion 89 has a substantially parallelogram shape and has an inclined surface 110a inclined so that the reduced side in the rod axis direction is positioned on the extension side in the rod axis direction toward the extension portion 86 in the rod peripheral direction . The inclined surface 111a is inclined so that the extension in the rod axis direction is located on the extension side in the rod axis direction toward the extension portion 86 in the rod circumferential direction. The surface 112a connecting the sides of the inclined surface 110a and the inclined surface 111a in the circumferential direction of the rod in the direction of the rod is along the direction of the rod axis and the extended portion 86 is formed on the extension of the surface 112a. And the side of the extension portion 86 of the release position concave surface 92a are disposed. The surface 113a connecting the end portions of the inclined surface 110a and the inclined surface 111a opposite to the extending portion 86 in the rod circumferential direction is along the direction of the rod axis. The end 102a of the extending portion 87 and the end side of the releasing position concave surface 92a opposite to the extending portion 86 are disposed. The expansion portion 89 has the center of the rod circumferential direction coincident with the center of the release position concave surface 92a and the phase of the expansion portion 88 is shifted by 90 degrees from the center of the expansion portion 88 in the circumferential direction of the rod.

A gas reaction force is applied to the piston 13 and the rod 12 shown in Fig. 2 and the piston 13 is moved by the gas reaction force so as to contract the seal 14 while expanding the seal 15 . As a result, the rod 12 is moved to the extension side protruding from the cylinder 11. When the rod 12 comes close to the maximum projecting state in which the rod 12 protrudes most from the cylinder 11 at the time of the movement, the rod 12, on the projection 81 of the cylinder- 3, the inclined surface 106a, the inclined surface 107a, or the inclined surface of the enlarged portion 89 of the extended portion 88 on the extension side (the upper side in Fig. 3) among the extended portions 85 to 89, Or directly contacts the sloped surface 96a of the enlarged portion 86 or the sloped surface 101a of the enlarged portion 87 on the reduced side (lower side in Fig. 3).

When one of the ramp projections 81, that is, the cylinder (not shown) is brought into contact with the projection 81 on the inclined face 106a, the inclined face 107a or the inclined face 111a of the extended portion 89, 11 relative to each other. When the protrusion 81 comes into contact with the inclined surface 106a of the enlarged portion 88, the inclined surface 107a of the extended portion 88 comes into contact with the inclined surface 96a of the extended portion 86, The slant surface 101a of the extended portion 87 is brought into contact with the inclined surface 111a of the extended portion 89 and then the inclined surface 101a of the extended portion 87 of the other set is brought into contact with the inclined surface 101a, Lt; / RTI >

When the slant surface 96a of the enlarged portion 86 or the slanted surface 101a of the enlarged portion 87 is brought into contact with the projection 81, any one of the slanting cylinders 11 is relatively rotated, And is brought into contact with the lock position concave surface 93a of the extension portion 85. [ As a result, the rod 12 reaches the maximum protruding state where the rod 12 protrudes most from the cylinder 11. For example, as shown in Fig. 3, with respect to the projection 81 relatively close to the position shown by A1, the rod 12 is inclined from the inclined surface 106a of the extending portion 88 The ramp protrusion 81, that is, the cylinder 11 is relatively rotated, and then the ramp protrusion 81 is in contact with the inclined surface 96a of the enlarged portion 86 as indicated by A3, (11) is relatively rotated, and contacts the lock position concave surface (93a) of the extension portion (85) as shown by A4. Since the projections 81 are formed by loosely fitting the pins 83 to the fitting holes 82 so as to be rotatable as shown in Fig. 2, the inclined surfaces 96a, 101a, 106a, 107a, and 111a, the frictional resistance is reduced by the rotation.

In the maximum projecting state described above, the enlarged portion 85 is pressed against the projection 81 by the gas reaction force applied to the rod 12 through the piston 13 shown in Fig. 2, The state in which the concave surface 93a contacts the protrusion 81 is maintained. The inclined surface 96a of the enlarged portion 86 or the inclined surface 101a of the enlarged portion 87 is located at a position where the protrusion 81 is aligned with the extending portion 88 in the circumferential direction of the rod, And the cylinder 11 is relatively rotated with respect to each of the ramp rods 12 at this time.

When the projection 81 comes into contact with the bottom of the lock position concave surface 93a, the cylinder 11 is positioned with respect to the rod 12 at the predetermined first relative rotational position. That is, at least the inclined face 96a of the extended portion 86 or the inclined face 101a of the extended portion 87 is provided on the outer peripheral surface of the rod 12 so that when the rod 12 reaches the maximum projected state, 81 so that the cylinder 11 is relatively rotated with respect to the rod 12 to be guided to a predetermined first relative rotational position.

When the rod 12 is inserted into the cylinder 11 in order to move the rod 12 to the reduced side (the lower side in Fig. 3) in this state, the state at the first relative rotational position is in the locked state. The concave surface 105a of the enlarged portion 88 opposed to the rod axis direction is brought into contact with the lock position concave surface 93a after the extended portion 85 is spaced apart in the rod axis direction And regulates the movement of the rod 12 in the reduction direction with respect to the cylinder 11. [ Even if the cylinder 11 is relatively rotated relative to the rod 12 at this time, the concave surface 95a of the extending portion 86 or the concave surface 100a of the extending portion 87 shown in Fig. 3 Contact the protrusion 81 and regulate the movement of the rod 12 in the direction of reduction.

As a result, when the rod 12 reaches the maximum protruding state in which the rod 12 protrudes most from the cylinder 11 shown in Fig. 2 by the extension stroke, the cylinder 12 automatically enters the locked state in which the reduction stroke is regulated. 3 that are provided on the outer circumferential surface of the rod 12 are arranged in such a manner that the cylinder 11 and the rod 12 are spaced apart from each other by the first relative When the rod 12 is moved in the inserting direction, it comes into contact with the protrusion 81 to hold the protrusion 81 in a locked state. The concave surfaces 95a, 100a and 105a of the extension portions 86, 87 and 88 restrict the rod 12 from being contracted beyond the center of the projections 81 when the centers of the projections 81 are within the respective ranges of the circumferential direction of the rods At that time, the protrusion 81 is guided to the central position in the circumferential direction of the rod, which is the deepest position at each time.

When the cylinder 11 is rotated relative to the rod 12 from the lock state at the first relative rotational position and becomes the predetermined second relative rotational position different from the first relative rotational position, So that the projection 81 relatively rotates (revolves) with respect to the rod 12. With the rotation of the projection 81, the rod 12 is slightly moved toward the reduction side in the rod axis direction against the gas reaction force in its initial (initial) period and is moved from the lock position concave surface 93a to the flat surface 91a The protrusions 81 are lifted up and the protrusions 81 are moved on the flat surface 91a and then the protrusions 81 are moved to the extension side in the rod axis direction by the gas reaction force at the position of the release position concave surface 92a at the end thereof And causes the protrusion 81 to enter the release position concave surface 92a. In this state, the releasing position concave surface 92a comes into contact with the projection 81 by the gas reaction force, and regulates the movement of the releasing position concave surface 92a in the circumferential direction of the rod. That is, the release position concave surface 92a is provided on the outer peripheral surface of the rod 12 so that when the cylinder 11 is positioned at the predetermined second relative rotational position with respect to the rod 12, And is in contact with the projection 81 by a gas reaction force so as to regulate the relative movement of the rod 12 with respect to the rotation direction of the cylinder 11. [ For example, as shown in Fig. 3, with respect to the protrusion 81 at a position shown by A4, the rod 12 is moved from the lock position concave surface 93a to the flat surface 91a as indicated by A5, And the protrusion 81 is caused to run on the flat surface 91a and the protrusion 81 is caused to enter the release position concave surface 92a as shown by A6. At this time as well, the protrusion 81 is reduced in frictional resistance when the protrusion 81 moves relative to the lock position concave surface 93a, the flat surface 91a, and the release position concave surface 92a.

When the rod 12 is inserted into the cylinder 11 in order to move the rod 12 to the reduced side (the lower side in Fig. 3) in this state, the rod 12 is brought into the second relative- The protrusions 81 are passed between the extension portions 86 and the surfaces 97a and 102a of the other extension portions 87 and then contact the protrusions 81 on the inclined surfaces 110a of the extension portions 89, The cylinder 11 is relatively rotated so as to bring the ramp projection 81 close to the enlarged portion 88, and then the movement in the reduction direction is further allowed. For example, as shown in Fig. 3, with respect to the protrusion 81 at the position shown by A6, the rod 12 is moved in the direction of the extended portion 86 and the other extending portion 87, The slant surface 110a of the extension 89 contacts the protrusion 81 and the slanting protrusion 81 contacts the extension 81 as shown by A8 The cylinder 11 is rotated relative to the cylinder 11 so as to be closer to the cylinder 11, and then the cylinder 11 is further allowed to move in the reduction direction as shown by A9. Even when the inclined surface 110a is moved relative to each other, the rotation of the projection 81 reduces frictional resistance.

The extension side end edge portion of the extension portion 85 including the flat surface 91a, the release position concave surface 92a and the lock position concave surface 93a is positioned so that the rod 12 is extended from the cylinder 11 The maximum length contacting portion 115 contacting the protrusion 81 is formed when the protruding maximum protruding state is reached. That is, the maximum length contact portion 115 includes a flat portion 91 having a flat surface 91a along the rod axis orthogonal direction, and a release position recessed portion 92b having a recessed position concave surface 92a recessed from the flat surface 91a. (Concave portion) 92 and a lock position concave portion 93 having a concave lock position concave surface 93a on the flat surface 91a.

The end edge portion including the concave surface 105a of the extending portion 88 is partially provided in the peripheral direction so as to face axially with the maximum length contacting portion 115 and is provided partially in the peripheral direction, And the end edge portion including the concave surface 95a of the expansion portion 86 is also formed in the same lock portion (not shown) 95 and the end edge portion including the concave surface 100a of the extension portion 87 constitute the same lock portion 100. [ The lock portions 95, 100, and 105 have concave surfaces 95a, 100a, and 105a facing the maximum length contact portion 115, respectively. Each of the lock portions 95, 100, and 105 is wider than the diameter of the projection 81 in the direction of the rod periphery.

The maximum length contact portion 115 is formed such that the positions of the flat surface 91a and the lock position concave surface 93a in the peripheral direction opposed to the lock portions 95, And the release position concave surface 92a which is a range of the circumferential direction which is not opposed to the lock portions 95, 100, and 105, is set to a lockable position where the rod 12 can not move in the downward direction, Is in the unlocking position where the rod 12 can move in the downward direction when the projection 81 is positioned in this range. Therefore, the lockable position of the maximum length contact portion 115 is the lock position recess 93 having the flat portion 91 having the flat surface 91a along the rod axis orthogonal direction and the lock position concave surface 93a And a release position recessed portion 92 having a release position recessed surface 92a to which the projection 81 is fitted is provided at the unlocked position of the maximum length contact portion 115. [

The end edge portion including the inclined surface 106a of the enlarged portion 88 is formed so that when the rod 12 reaches the maximum protruding state, the protrusion 81 is extended to the extended portion 88 in the circumferential direction of the maximum length contacting portion 115, The guiding portion 106 is provided so as to be spaced apart from the maximum length contacting portion 115 in the axial direction so as to be guided to a position facing the concave surface 105a of the locking portion 105 of the extending portion 88, And the end edge portion including the inclined surface 111a of the extended portion 89 includes the same guiding portion 111 and the same portion including the surface 112a of the extending portion 89 The same edge portion including the inclined surface 96a of the extended portion 86 is also used for the same guiding portion 96 and the edge portion including the inclined surface 101a of the extended portion 87 is also the same And guide portion 101, respectively. The guide portions 96, 101, 106, 107 and 111 automatically rotate the relative rotational positions of the cylinder 11 and the rod 12 to the lock position when the rod 12 is extended to the maximum length.

The lock portion 95 and the guide portion 96 are respectively formed on one side and the other side of the extension portion 86 provided in the axial direction and spaced apart from the maximum length contact portion 115. The lock portion 100, The lock portion 105 and the guide portions 106 and 107 are formed on one side and the other side of the same extension portion 88 respectively have.

The protrusion 81 and the extension portions 85 to 89 lock the rod 12 automatically to the maximum length with respect to the cylinder 11 so that the rod 11 can not be automatically reduced in length, The cam mechanism 120 constitutes a cam mechanism 120 for releasing the lock so that the length can be reduced. The cam mechanism 120 is provided at a position between the cylinder 11 and the rod 12 in the cylinder 11.

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

When the marks 122 and 123 align with the circumferential direction of the cylinder so as to face each other in the cylinder axis direction, the projections 81 are fitted to the lock position recesses 93 of the extending portions 85, That is, the rod 12 and the cylinder 11 are positioned at the predetermined first relative rotational position. In other words, the relative rotational position of the rod 12 and the cylinder 11 is at the lock position . On the other hand, when these marks 122 and 123 are displaced by 90 degrees from the circumferential direction of the rod, the protrusion 81 is positioned in the release position recess 92 of the extension 85 in the direction of the rod circumferential direction The state in which the rod 12 and the cylinder 11 are positioned at the predetermined second relative rotational position and in other words the relative rotational position of the rod 12 and the cylinder 11 is in the unlock position do. A letter "LOCK" indicating that the relative rotational position of the cylinder 11 and the rod 12 is at the lock position is additionally formed in the mark 122 formed on the cylinder 11. [

The operator attaches the mounting bracket 73 to one side of the object to be mounted, loosens the nut 40, and adjusts the mounting bracket 32 to the other side of the object to be mounted And is attached to the other side of the mounting object. Therefore, the rotation angle of the mounting bracket 32 with respect to the cylinder 11 is determined at this point in time. The mark 123 of the mounting bracket 32 in a state in which the rod 12 is in the fully protruding state while the mounting bracket 73 and the mounting bracket 32 are attached to the mounting object and the nut 40 is released, It is preferable to stick the mark 122 of the cylinder 11 later. Therefore, the mark 122 of the cylinder 11 is a seal label which can be attached later. On the other hand, the mark 123 of the mounting bracket 32 is formed by engraving. 1, only the characters of "LOCK" are shown. However, the character "UNLOCK" indicating the unlock position where the projection 81 is located at the unlock position may be described, It is good.

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

The cylinder apparatus is constituted such that the mounting plate portion 34 of the mounting bracket 32 attached to the cylinder 11 and the mounting plate portion 75 of the mounting bracket 73 attached to the rod 12 are attached to the mounting holes 33, For example, a base member (not shown) and an opening / closing member (not shown) pivotally moving relative to the base member. When the opening / closing member is normally closed, it is preferable that the mounting direction is such that when the opening / closing member is closed, the protruding side (upper side in the drawing) of the rod 12 of the cylinder apparatus faces downward. This is because it is preferable to ensure that the oil in the cylinder is in contact with the seal ring 46 as much as possible in order to ensure sealing and sliding properties.

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

The piston 13 is moved in the cylinder axis direction in the cylinder 11 to change the volume of the chambers 14 and 15 so that the chambers 14 and 15 are connected to each other The flow passage hole 64 of the piston 13 controls the flow of oil and generates a damping force to suppress the swing speed of the opening and closing member. Oil and gas are sealed in the cylinder 11 and the amount of the oil is sealed by the amount of flow of the oil from the position where the rod 12 approaches the maximum protruding state to the flow hole 64.

Here, when the operator swings the opening and closing member in the opening direction, the rod 12 is moved to the side projecting from the cylinder 11 by the gas reaction force. As a result, the projections 81 are relatively moved toward the extension portions 85 to 89 in the rod axis direction. At this time, the protrusions 81 are provided in the guiding portions 96, 101 of the extending portions 86, 87 when the relative positions in the rod circumferential direction are shifted with respect to both the extending portions 88 and the extending portions 89, The relative movement of the rod 12 and the cylinder 11 relative to the extension portion 85 in the rod axis direction causes relative movement of the lock position recess 93 with the gas reaction force, And then stops. In this state, the rod 12 becomes the maximum protruding state protruding most from the cylinder 11, and the rod 12 and the cylinder 11 are located at the first relative rotational position.

On the other hand, when the position of the projection 81 in the radial direction of the rod matches the extending portion 88, the projection 81 comes into contact with any one of the guide portions 106 and 107, The cylinder 11 relatively moves toward the extension portions 86 and 87 in the rod axis direction and moves away from the extension portion 88 in the circumferential direction of the rod and relatively extends in the rod axis direction in the extension portion 86 Or the extension portion 87 to come into contact with any one of the guide portions 96 and 101 of the extension portions 86 and 87 and then the rod 12 and the cylinder 11 relative to the extension portion 85 in the rod axis direction and comes into contact with the bottom of the lock position recess 93 and stops.

When the position of the projection 81 in the rod circumferential direction coincides with the extending portion 89, the projection 81 comes in contact with any one of the guide portions 111 and 112, The rod 11 relatively moves toward the extension portion 86 in the rod axis direction or toward the extension portion 87 in the other rod portion and moves away from the extension portion 89 in the circumferential direction of the rod, It moves toward the axial extension portion 86 or the other extension portion 87 and contacts any one of the guide portions 96 and 101 of the extension portions 86 and 87. Thereafter, The relative movement of the rod 12 and the cylinder 11 relative to the extension portion 85 in the direction of the rod axis causes relative movement of the lock position recess 93 or the other lock position recess 93 It comes into contact with the floor and stops.

In other words, in either case, the projection 81 aligns with the concave lock position recess 93 on one side in the rod axis direction in the circumferential direction of the rod. As described above, when the projection 81 is located in the lock position recess 93, the rod 12 is in the fully protruded state and the rod 12 and the cylinder 11 are in the first relative rotational position In addition, the marks 122 and 123 of the position confirming portion 121 are aligned with the positions in the rod circumferential direction.

Next, when the operator rotates the cylinder 11 in one direction at 90 degrees in a state in which the projection 81 is located at the lock position recess 93, the projection 81 is moved in the lock position recess 93, And then moves in the rod circumferential direction along the flat portion 91 to be released from the release position recess 92 At the position of the release position concave portion 92 by the gas reaction force and comes into contact with the bottom thereof and stops. 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 causes a rotational resistance in the cylinder 11 while the projection 81 is moving on the flat portion 91. At the position of the release position recess 92, the projection 81 Enters the releasing position recess 92 naturally and comes into contact with the bottom of the releasing position recess 92, and the rotational resistance is lowered. Further, when it tries to exit from the release position recess 92, the rotational resistance by the gas reaction force again occurs. As a result, when the projection 81 is located in the release position recess 92, an accent occurs in which the rotational operation force of the cylinder 11 becomes weaker than before and after the projection, and a so-called clicking feeling is generated.

With this clicking feeling, the operator determines that the unlocked state has been released, and swings the opening and closing member in the closing direction against the gas reaction force. As a result, the rod 12 is moved to the rod insertion side, and the projection 81 relatively moves in the direction opposite to the extending portion 85 in the rod axis direction. At this time, since the position of the projection 81 in the rod circumferential direction is matched with the inclined surface 110a of the enlarged portion 89, the projection 81 comes into contact with the inclined surface 110a, The cylinder 11 relatively moves toward the extension portion 88 in the circumferential direction of the rod and moves away from the inclined surface 110a and thereafter the projection 81 is relatively moved in the rod axis direction, (85). As a result, the rod 12 is moved to the rod insertion side, and the opening and closing member is closed. Thereafter, the opening and closing member is locked by the locking mechanism as required.

When the operator pivots the opening and 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 locking position recess 93, The projections 81 move relatively to the side opposite to the extending portions 85 in the direction of the rod axes but the projections 81 are positioned so that the positions of the projections 81 in the rod- The abutting surface 105a of the lock portion 105 is stopped at the position of the bottom thereof and the relative movement to the opposite side of the extension portion 85 in the rod axis direction is restricted. That is, the lock state is established.

When the cylinder 11 is relatively rotated within a range in which the projection 81 is not located in the release position recess 92 while the projection 81 is located in the lock position recess 93, The rod 12 is moved to the rod insertion side and the projection 81 moves relatively to the side opposite to the extending portion 85 in the rod axis direction. However, when the projection 81 Is brought into contact with any one of the concave surfaces 95a and 100a of the lock portions 95 and 100 so as to be brought into contact with any one of the lock portions 95 and 100 Relative movement to the opposite side of the extension portion 85 in the rod axis direction is restrained. That is, the lock state is established.

Then, for example, when the mass of the opening and closing member is increased by placing a load on the opening and closing member by the operator, or the gas pressure in the cylinder 11 is lowered, the gas reaction force is lowered, When the opening / closing member can not be held in the fully projected state, that is, when the opening / closing member can not be held in the fully opened state, the opening / closing member swings in the closing direction against the gas reaction force, The cylinder 11 and the rod 12 remain in the first relative rotational position so that the rod 12 moves to the rod insertion side and the projection 81 relatively moves in the rod axis direction As shown in FIG. In this case as well, the projections 81 come into contact with the concave surface 105a of the lock portion 105 and stop at their bottom positions because the positions of the projections 81 in the rod circumferential direction are aligned with each other, Relative movement to the opposite side of the axial extension portion 85 is restricted. Thus, the lock 12 is brought into the locked state in which the movement of the rod 12 to the rod insertion side is regulated, and the open / close member is kept open.

When the operator closes the opening and closing member from this state, the operator rotates the cylinder 11 so as to move the projection 81 from the concave surface 105a of the lock portion 105 to the vicinity of the load The protrusion 81 is moved to the outside of the protrusion 81 and the protrusion 81 is moved to the outside of the protrusion 81. As a result, the lock portion 105, which regulates the movement of the protrusion 81 on the side opposite to the extending portion 85 in the rod axis direction, The rod 12 is moved to the insertion side so that the opening and closing member is closed. Thereafter, if necessary, the opening and closing member is locked by the locking mechanism, do.

In the cylinder apparatus described in the above-mentioned Patent Document 1, when the rod is projected from the cylinder to the maximum, the lock state automatically regulates the movement of the rod in the insertion direction into the cylinder. However, in this cylinder apparatus, There has been a problem that the operation of pushing the rod relatively large against the gas reaction force is required and the operability of unlocking is poor.

On the other hand, according to the first embodiment described above, when the rod 12 reaches the maximum protruding state, the guiding portions 96, 101, 106, 107, and 111 provided spaced apart from the maximum length contacting portion 115 in the axial direction Guiding the projection 81 to the lock position concave portion 93 facing the lock portion 105 in the circumferential direction of the maximum length contact portion 115 so that the lock portion 105 moves the rod 12 downward So as not to move in the direction. The protrusion 81 is guided by the guide portions 96, 101, 106, 107 and 111 spaced apart from the maximum length contact portion 115 in the axial direction to the lock portion 105 It is not necessary to largely move the rod 12 and the cylinder 11 against the gas reaction force at the time of unlocking because the rod 12 and the cylinder 11 are led to the opposing lock position recesses 93. [ That is, if the protrusion 81 is guided to the lock position recess 93 according to the shape of the maximum length contact portion 115 by the gas reaction force, the protrusion 81 is greatly moved relative to the gas returning force But this need is eliminated. Therefore, the rotation torque necessary for the unlocking operation can be reduced, and the operability of the unlocking operation can be improved. Particularly, when it is arranged in a space which is narrow and is difficult to be rotated manually by manual operation, the effect of reducing the rotational torque is enhanced. That is, for example, in the case where the fist can not be inserted, and the space can be filled with only the fingertip, the cylinder 11 and the rod 12 can be rotated relative to each other by the force of only the fingertip.

Further, since it is necessary to perform an operation that the operator intends to relatively rotate the cylinder 11 and the rod 12, it is possible to prevent the lock from being inadvertently released. Further, since the operation of manually rotating the cylinder 11 and the rod 12 relative to each other is performed, unlocking is also facilitated. Therefore, the usability can be improved. In addition, since the unlocking operation is an operation of rotating the cylinder 11 and the rod 12 relative to each other, the swinging motion of the releasing member is not considered, and the mounting space is not limited.

More specifically, when the rod 12 is extended to the maximum length, the guide portions 96, 101, 106, 107, 111 move the relative rotation position of the cylinder 11 and the rod 12, And automatically rotates to the lock position regulating the reduction in the vicinity of the maximum length. Therefore, when the rod 12 is stretched to the maximum length, it automatically becomes a lock state that restricts the rod 12 from being reduced in the vicinity of the maximum length. In addition, when the lock releasing position allows the relative rotation position of the cylinder 11 and the rod 12 to be manually reduced in the vicinity of the maximum length, the rod 12 can be reduced in the vicinity of the maximum length. Therefore, since it is necessary to operate the relative rotation position of the cylinder 11 and the rod 12 to the lock release position, it is possible to prevent the lock from being inadvertently released. In addition, since the relative rotational position of the cylinder 11 and the rod 12 is set to the lock release position, the release of the lock can be facilitated. Therefore, the usability can be improved. In addition, since the unlocking operation is an operation of setting the relative rotation position of the cylinder 11 and the rod 12 to the unlocking position, the swinging motion of the releasing member is not considered, and the mounting space is not limited.

The range of the circumferential flat portion 91 and the lock position recess 93 facing the lock portion 95 out of the maximum length contact portions 115 extending in the circumferential direction is smaller than the projection 81 in this range. And the range of the circumferential release position recess 92 that is not opposed to the lock portion 95 is such that the projection 81 is in this range Since the rod 12 can be moved in the downward direction when the rod 12 is positioned, when the lock is released, the protrusion 81, which contacts the maximum length contact portion 115 by a gas reaction force, It is sufficient to move from the lockable position to the unlocking position along the guide rail 115. Therefore, the rotational torque required for the unlocking operation can be reduced, and the operability of the unlocking operation can be further improved.

Since the lockable position of the maximum length contact portion 115 has the flat portion 91, when the lock is released, the protrusion 81 contacting the maximum length contact portion 115 by the gas reaction force is moved to the flat portion 91, To the unlocking position. Therefore, the rotational torque required for the unlocking operation can be reduced, and the operability of the unlocking operation can be further improved.

The protrusion 81 located at the unlocking position of the maximum length contacting portion 115 is fitted to the unlocking position recess 92 by the gas reaction force so that the operation force can be given an accent. Can be recognized. That is, when the cylinder 11 and the rod 12 come to the predetermined second relative -rotation position, which is different from the predetermined first relative -rotation position, to the unlocked state, the release position recess 92 The cylinder 11 and the rod 12 are brought into contact with the projection 81 to restrict the movement in the rotational direction when the rod 12 moves in the projecting direction, It is possible to inform the operator of the change in the operation feeling that the second relative rotation position has been reached. Therefore, the usability can be further improved.

The lock portion 95 and the guide portion 96 are respectively formed on one side and the other side of the extension portion 86 provided in the axial direction and spaced apart from the maximum length contact portion 115, And the guide portion 101 are formed on one side and the other side of the same extension portion 87 and the lock portion 105 and the guide portions 106 and 107 are formed on one side and the other side of the same extension portion 88, It is possible to reduce the number of the extension parts, thereby making it possible to achieve weight reduction and cost reduction.

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

Since the surfaces of the lock portions 95, 100 and 105 opposed to the maximum length contact portions 115 are the concave surfaces 95a, 100a and 105a, the rod 12 is preferably regulated so as not to move in the reduction direction .

It is also possible to confirm that the projection 81 is in the locking position opposite to the lock portion 95 and the rod axis direction when the positioning portion 121 on the outer surface of the cylinder 11 is seen. Can be easily and reliably recognized by the operator as being in the lock position opposite to the lock portion 95 in the direction of the rod axis. Therefore, ease of use and safety can be further improved.

In addition, since the cam mechanism 120 can be housed in the cylinder 11, it can be shaped like the conventional gas spring, and the overall size can be reduced.

Since the projection 81 is formed by loosely fitting the pin 83 to the fitting hole 82 in a rotatable manner, when the projection 81 contacts the maximum length contact portion 115 and moves, The frictional resistance can be reduced. Therefore, the rotation torque required for the unlocking operation can be further reduced, and the operability of the unlocking operation can be further improved.

&Quot; Second Embodiment "

Next, a second embodiment according to the present invention will be mainly described with reference to Fig. 4, focusing on differences from the first embodiment. Parts common to those of the first embodiment are denoted by the same reference numerals and the same reference numerals.

The projections 130 and 131 protruding from the flat portion 91 are provided between the flat portion 91 which is the lockable position in the rod circumferential direction and the unlocked position recessed portion 92 which is the unlocked position Respectively. The protrusions 130 and 131 have a semicircular cross section with a narrow end and the protrusions 81 extend from the flat portion 91 to the release position recess 92 in the circumferential direction of the rod along the maximum length contact portion 115 When you move, you can ride over.

In the second embodiment, when the rod 12 is moved to the extension side (the upper side in Fig. 4) and protruded from the cylinder 11, the rod 12 is guided by the guide portions 96, 101 and 106 The protrusion 81 or the cylinder 11 is rotated relative to the protrusion 81 by any one of the guides 107 and 111 so that the protrusion 81 is finally moved from the lock position concave surface 93a of the expanding portion 85 And comes into a locked state in which it is located at the first relative rotational position with respect to the cylinder 11 (see A1 to A4, for example).

When the cylinder 11 becomes a predetermined second relative -rotation position relative to the rod 12 to be relatively rotated and unlocked, the projection 81, which rotates integrally with the cylinder 11, And travels over one of the projections 130 and 131 against the gas reaction force to enter the release position concave surface 92a. For example, as shown by A5 in Fig. 4, after the protrusion 81 runs on the flat surface 91a, the protrusion 81 rides over the protrusion 131 against the gas reaction force as shown by B5, As shown in Fig. 5A, into the release position concave surface 92a.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 from the unlocked state to the reduced side, the rod 12 is moved in the direction of the plane of the enlarged portion 86 and the extending portion 87 97a and 102a so as to come into contact with the protrusion 81 on the inclined surface 110a of the enlarged portion 89 and bring the protrusion 81 close to the enlarged portion 88 by the inclination of the protrusion 81 After the cylinder 11 is relatively rotated, movement in the downward direction is further allowed (see, for example, A6 to A9).

According to the second embodiment described above, the protrusions 130, 131 protruding from the flat portion 91 are provided between the flat portion 91, which is the lockable position in the rod circumferential direction, and the release position recess portion 92, The protrusions 130 and 131 and the release position recess 92 restrict the movement of the projection 81 in the circumferential direction of the rod or the relative rotation of the cylinder 11 with respect to the rod 12 . Therefore, it is possible to transmit the fact that the cylinder 11 becomes the predetermined second relative -rotation position to be unlocked with respect to the rod 12, to the operator with the change of the operation feeling. Therefore, the usability can be further improved.

&Quot; Third Embodiment "

Next, a third embodiment according to the present invention will be mainly described with reference to Fig. 5, focusing on differences from the first embodiment. Parts common to those of the first embodiment are denoted by the same reference numerals and the same reference numerals.

In the third embodiment, the shape of the maximum length contact portion 115 of the extension portion 85 is different from that of the first embodiment. The maximum length contact portion 115 of the third embodiment is similar to the maximum length contact portion 115 of the third embodiment in that the opening side of the lock position concave surface 93a and the release position concave surface 92a and the bottom side of the releasing position concave surface 92a of the other group The inclined surfaces 135a and 136a are formed instead of the flat surface 91a of the first embodiment so as to connect them. The inclined surface 135a connects the lock position concave surface 93a and the release position concave surface 92a and the inclined surface 136a connects the lock position concave surface 93a and the other release position concave surface 92a Are inclined such that the side of the lock position concave surface 93a is located on the extension side (the upper side in Fig. 5) in the rod axis direction. The maximum length contact portion 115 of the third embodiment has the release position recess 92 including the release position recess 92a and the lock position recess 93 including the lock position recess 93a An inclined portion 135 including an inclined surface 135a and an inclined portion 136 including an inclined surface 136a.

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

In the third embodiment, when the rod 12 is moved to the extension side (upper side in Fig. 5) and protruded from the cylinder 11, the rod 12 is guided by the guide portions 96, 101, 106, The projection 81 and the cylinder 11 are rotated relative to each other by any one of the guide portions 107 and 111 so that the projection 81 is finally brought into contact with the lock position concave surface 93a of the expansion portion 85 (See A1 to A4, for example) which is located at the first relative rotational position with respect to the cylinder 11. [

When the cylinder 11 relatively rotates relative to the rod 12 from the locked state at the first relative rotational position to a predetermined second relative rotational position, the projection 81, which rotates integrally with the cylinder 11, It initially slightly moves against the gas reaction force and is repelled by one of the inclined surfaces 135a and 136a from the lock position concave surface 93a to run any one of the inclined surfaces 135a and 136a. When the guide rods 81 of the inclined surfaces 135a and 136a move, the projections 81 move in the rod axis direction while moving in the rod circumferential direction, 12) is increased, the operation force required for the relative rotation is further reduced.

When the cylinder 11 reaches a predetermined second relative rotational position with respect to the rod 12, the projection 81 enters the unlocked state in which it comes into contact with the unlocked position concave surface 92a by the gas reaction force. Thus, the release position concave surface 92a and the inclined surfaces 135a, 136a on both sides regulate the movement of the projection 81 in the circumferential direction of the rod by the gas reaction force. 5, the projections 81 are repelled from the lock position concave surface 93a by the inclined surfaces 135a as indicated by C5, as shown by A4, and the inclined surfaces 135a , And enters the releasing position concave surface 92a as indicated by A6.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 from the unlocked state to the reduction side (the lower side in Fig. 5), the rod 12 is extended from the extension portion 86 and the extension After passing the protrusion 81 between the surfaces 97a and 102a of the protrusion 87 and contacting the protrusion 81 on the inclined surface 110a of the enlarged portion 89 and connecting the inclined protrusion 81 to the extension portion 88 (Refer to, for example, A6 to A9). In this state, the cylinder 11 is rotated relative to the cylinder 11 so that the cylinder 11 is relatively rotated.

According to the third embodiment, since the lockable position of the maximum length contact portion 115 guides the projection 81 at the inclined portions 135 and 136 located in the propelling direction of the gas reaction force toward the unlocked position side , The operability of the unlocking operation can be further improved.

&Quot; Fourth embodiment "

Next, a fourth embodiment according to the present invention will be mainly described with reference to Fig. 6, focusing on differences from the first embodiment. Parts common to those of the first embodiment are denoted by the same reference numerals and the same reference numerals.

In the fourth embodiment, the extending portion 89 is longer in the rod circumferential direction than in the first embodiment, and as a result, the distance between the extending portion 86 and the extending portion 87 of the other tank is widened . In addition, in the fourth embodiment, the shape of the maximum length contact portion 115 of the extension portion 85 is different from that of the first embodiment.

That is, the expansion portion 85 of the fourth embodiment does not have the lock position concave surface 93a and the release position concave surface 92a of the first embodiment, and the center of the extension portion 89 in the circumferential direction of the rod A protrusion 140 protruding from the flat surface 91a of the flat portion 91 in a tip shape is formed. The surfaces 140a and 140b on both sides in the rod circumferential direction of the protrusion 140 are formed into a curved concave shape having the same diameter as the diameter of the protrusion 81. [

Here, when the projection 81 is in contact with either the flat surface 91a or the surfaces 140a and 140b of the projection 140 at the same time, the protrusion 81 in the circumferential direction of the rod The extension portion 86 is formed at a position away from the protruding portion 140, The maximum length contact portion 115 is composed of a flat portion 91 and a protrusion portion 140. The maximum length of the flat portion 91a in the circumferential direction opposed to the lock portions 95, The rod 12 is in a lockable position in which the rod 12 can not move in the downward direction when the projection 81 is positioned and a protruding portion 91a which is not opposed to the lock portions 95, 140 are in the unlocking position where the rod 12 can move in the downward direction (downward in Fig. 6) when the projection 81 is positioned in this range.

In the fourth embodiment, when the rod 12 is moved to the extension side (upper side in Fig. 6) and protruded from the cylinder 11, the rod 12 is guided by the guide portions 96, 101 and 106 The projection 81 and the cylinder 11 are rotated relative to each other by the guidance of any one of the guide portions 107 and 111 and finally the projection 81 is brought into contact with the flat surface 91a of the extending portion 85, (See, for example, A1 to A3 and D4). In this locked state, the relative rotation of the rod 12 and the cylinder 11 is regulated by the frictional force caused by the gas reaction force generated between the projection 81 and the flat portion 91. Even in this case, the concave surface 95a of the expansion portion 86 or the concave surface 100a of the expansion portion 87 can be prevented from being deformed by the protrusion (not shown) even if the cylinder 11 is relatively rotated relative to the rod 12 81 so as to regulate the movement of the rod 12 in the downward direction.

When the cylinder 11 is relatively rotated with respect to the rod 12 from the lock state at the first relative rotational position to become the predetermined second relative rotational position different from the first relative rotational position, The projection 81 runs on the flat surface 91a. Therefore, it is not necessary to move the projection 81 against the gas reaction force in the entire range of the relative rotation, and the operation force required for the relative rotation is reduced. Then, when the predetermined second relative -rotation position is reached, the projection 81 comes into the unlocked state in which it comes into contact with the projection 140. [ At this time, the relative rotation of the cylinder 11 with respect to the rod 12 is regulated by the frictional force caused by the gas reaction force generated between the projection 81 and the flat portion 91. For example, as shown in Fig. 6, the projection 81 at the position shown by D4 travels on the flat surface 91a of the rod 12 as indicated by D5, and as shown by D6, And contacts the surface 140b of the base 140.

When the rod 12 is inserted into the cylinder 11 to move the rod 12 from the unlocked state to the reduction side (the lower side in Fig. 6), the rod 12 is extended to the extension portion 86 and the extension After passing the protrusion 81 between the surfaces 97a and 102a of the protrusion 87 and contacting the protrusion 81 on the inclined surface 110a of the enlarged portion 89 and connecting the inclined protrusion 81 to the extension portion 88 After the cylinder 11 is relatively rotated, the movement in the downward direction is allowed as shown by D8 and D9.

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

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

&Quot; Fifth embodiment "

Next, a fifth embodiment according to the present invention will be mainly described with reference to Figs. 3 and 7, focusing on differences from the first embodiment. Parts common to those of the first embodiment are denoted by the same reference numerals and the same reference numerals.

In the fifth embodiment, a dust cover 240 for covering a portion of the rod 12 protruding from the cylinder 11 is provided. The dust cover 240 has a substantially cylindrical dust cover body 243 having a cylindrical portion 241 and a lid portion 242 for blocking one end of the cylindrical portion 241. In the center of the lid portion 242 And is rotatably supported by the rod 12. The dust cover 240 is provided so as to be rotatable relative to the rod 12 and the cylinder 11 in a state in which axial movement with respect to the rod 12 is regulated.

The dust cover main body 243 is provided with inner projections 245 and 246 at two positions in a circular shape with a smaller diameter than the main body portion 244 of another constant diameter on the side opposite to the lid portion 242 of the tubular portion 241. [ Are coaxially formed by plastic working. The dust cover main body 243 is provided with a plurality of engaging convex portions 247 protruding inward in the radial direction at positions between the two inside protruding portions 245 and 246.

In the fifth embodiment, the outer peripheral surface of the cylinder 11 on the opposite side of the opening 23 in the vicinity of the inner projecting portion 27 of the body 20 is extended in the cylinder radial direction from the inner projecting portion 27 A plurality of projections 81 similar to those of the first embodiment are formed. In this embodiment, the cylinder itself constitutes the cylinder side member of the present invention.

Five kinds of extension portions 85, 86, 87, 88, and 89 as in the first embodiment are arranged in the tubular portion 241 of the dust cover main body 243 in two sets, In the left-right direction). The inner circumferential member 82 is sandwiched between the inner side projections 245 and 246 on both sides of the dust cover main body 243 and the engaging convex portion 247 is inserted into the engaging concave portion 83 on the outer circumferential surface. Accordingly, the inner peripheral member 82 is restricted from moving in the cylinder axis direction and the cylinder peripheral direction with respect to the dust cover main body 243. The inner peripheral member 82 constitutes the dust cover 240 together with the dust cover main body 243.

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

The cylinder 11 and the dust cover 240 are provided with the same position confirming portion as in the first embodiment in which it is possible to visually confirm that the projection 81 is locked. The position confirming portion includes a triangular mark 122 formed on the trunk portion 20 of the cylinder 11 and directed toward the dust cover 240 along the cylinder axis direction and a cylindrical portion 241 of the dust cover 240, , And a triangular mark 123 formed so as to face the cylinder 11 along the cylinder axis direction. That is, this position confirming section can confirm that the projection 81 is in the locking position facing the cylinder axis direction, on the outer surface of the dust cover 140.

The operation of the above configuration is the same as that of each of the above embodiments. In the fifth embodiment, an example is shown in which the projections 81 are provided directly on the cylinder 11 and the extension portions 85, 86, 87, 88, and 89 are provided on the inner periphery of the dust cover 240 However, the protrusion 81 may be provided on the dust cover 240, and the expansion portions 85, 86, 87, 88, and 89 may be provided on the cylinder 11. The shapes of the extension portions 85, 86, 87, 88, and 89 and the maximum length contact portion 115 may be changed as appropriate as in the second to fourth embodiments.

The first to fifth embodiments described above are a cylinder apparatus having a cylindrical cylinder and a rod whose one end is inserted into one end of the cylinder and is pushed in the projecting direction and relatively rotatable with respect to the cylinder, Side member provided with at least a restriction on the movement in the axial direction with respect to the rod-side member and a rod-side member provided with at least the movement in the axial direction being restricted with respect to the rod, A protrusion provided on either one of the peripheral surfaces of the side members and extending in the radial direction and a peripheral surface of the cylinder side member facing the peripheral surface provided with the protrusion or the other surface of the rod side member, A maximum length contact portion extending in a circumferential direction in which the projection comes into contact when the rod becomes the maximum protruding state, A lock portion which is provided partially in the peripheral direction so as to face the contact portion in the axial direction and regulates the projection so that the projection comes into contact with the rod when the rod is reduced in length so that the rod does not move in the reduction direction; And a guide portion provided to be spaced apart from the maximum length contact portion in the axial direction so as to guide the protrusion to a position facing the lock portion in the circumferential direction of the maximum length contact portion. Thus, when the rod becomes the maximum protruding state, the guide portion provided in the axial direction and spaced apart from the maximum length contact portion guides the protrusion to a position opposed to the lock portion in the circumferential direction of the maximum length contact portion, It is regulated not to move in the downward direction. Since the guide portion is guided to the position facing the lock portion in the circumferential direction of the maximum length contact portion by the guide portion spaced apart from the maximum length contact portion in the axial direction as described above, the rod and the cylinder are made large There is no need to move them relative to each other. Therefore, the operability of the unlocking operation can be improved.

In the first to fifth embodiments, it is preferable that the maximum length contact portion has a range of a circumferential direction in which the maximum length contact portion is opposed to the lock portion is a lockable position where the rod is unable to move in the reduction direction And the range of the circumferential direction not opposed to the lock portion is an unlocking position in which the rod is movable in the reduction direction when the projection is located in this range. As described above, among the maximum length contact portions extending in the peripheral direction, the range of the peripheral direction facing the lock portion is a lockable position where the rod becomes unable to move in the reduction direction when the projection is located in this range, Since the range of the non-opposing circumferential direction is the lock releasing position in which the rod can move in the reducing direction when the protrusion is located in this range, when the lock is released, the lock is released from the lockable position along the maximum- It is preferable to move the projection to the release position. Therefore, the operability of the unlocking operation can be further improved.

The fourth embodiment is characterized in that the lockable position of the maximum length contact portion is flat. Accordingly, when releasing the lock, the projection may be moved from the flat lockable position to the unlocked position. Therefore, the operability of the unlocking operation can be further improved.

Further, in the first to fifth embodiments, a recessed portion to which the projection is fitted is provided at the unlocking position of the maximum length contacting portion. Accordingly, since the protrusion located at the unlocked position of the maximum length contact portion is fitted to the concave portion, it is possible to make the operation force have an accent, and it is possible to recognize that the operator is located at the unlocked position.

The second embodiment is characterized in that a projection is provided between the lockable position and the unlocking position in the circumferential direction so that the protrusion can ride over when the protrusion moves in the peripheral direction along the maximum length contact portion do. Thus, when the protrusion moves from the lockable position to the unlocked position, the protrusion rides over the protruded portion, so that the operation force can be more accented and the operator can be positioned at the unlocked position.

The first to fifth embodiments are characterized in that the lock portion and the guide portion are respectively formed on one side and the other side of the extension portion provided to be spaced apart from the maximum length contact portion in the axial direction. As described above, since the lock portion and the guide portion are respectively formed on one side and the other side of the extension portion provided to be spaced apart from the maximum length contact portion in the axial direction, the number of the extension portions can be reduced and weight reduction and cost reduction can be achieved .

Further, in the first to fifth embodiments, the lock portion is characterized by being wider than the diameter of the projection. Thus, since the lock portion is wider than the diameter of the projection, it is possible to satisfactorily restrict the rod from moving in the reduction direction.

The first to fifth embodiments are characterized in that the lock portion is formed with a concave surface on a surface facing the maximum length contact portion. Thus, since the surface facing the maximum length contact portion of the lock portion is formed as a concave surface, it is possible to satisfactorily restrict the rod from moving in the reduction direction.

In the first to fifth embodiments described above, a case has been described in which the force is applied to the rod 12 in the projecting direction by the gas pressure in the cylinder. However, by the pressing force of the spring or the pressure of the gas and the pressing force of the spring, 12 may be pressed in the protruding direction.

In the first to fifth embodiments described above, the case in which the opening and closing member is opened by the gas reaction force is shown. However, the movement in the opening direction is different depending on the weight of the opening and closing member, the gas reaction force, There is a case in which only the gas reaction force of the cylinder apparatus moves and a case in which the weight of the opening and closing member is assisted by the gas reaction force of the cylinder apparatus and is moved by the force of the operator. The cylinder apparatus of the present embodiment is applicable to both cases .

In the first to fifth embodiments described above, the gas and the small amount of the oil liquid are mixed in the cylinder. However, the present invention is not limited to this, and the free piston may be provided in the lower- And the oil side may be filled with the oil. With such a configuration, it is possible to install the rod projecting side while always facing the vertical upper side.

In the first to fifth embodiments described above, the flow path hole 64 is always open. However, the present invention is not limited to this. The piston 13 may have an annular flexible shape And a fixed orifice having a small flow passage area that is always in communication with the disc valve. Accordingly, when the rod 12 is shrunk, operation with a small force becomes possible, and at the time of elongation, the elongation speed can be adjusted to the area of the fixed orifice.

In the first to fifth embodiments, the rod 12 is fixed and the cylinder 11 side is rotatable. However, the present invention is not limited to this, and the rod 12 side and the cylinder 11 The rod 12 may be rotatably mounted on the mounting bracket 73 and the mounting bracket 32 may be fixed to the cylinder 11. [ If the cylinder is configured so that the cylinder side member (relative to the cylinder may be rotated relative to the cylinder) fixed to the cylinder and the rod side member (which may rotate relative to the rod) relative to the rod are relatively rotated good.

11: Cylinder
12: rod (rod side member)
79: cylinder side member
81: projection
85 to 89:
91: flat part
92: Release position recess (recess)
95, 100, 105:
95a, 100a, 105a: concave surface
96, 101, 106, 107, 111, 112:
115: Maximum length contact
130, 131:

Claims (10)

A cylindrical cylinder,
A rod which is inserted into one end of the cylinder at one end and is urged in the projecting direction and which is axially displaceable and relatively rotatable with respect to the cylinder,
The cylinder apparatus comprising:
A cylinder side member provided with at least a restriction on the movement in the axial direction with respect to the cylinder and a rod side member provided with at least an axial movement restriction with respect to the rod,
A projection provided on either the peripheral surface of the cylinder-side member or the peripheral surface of the rod-side member and extending in the radial direction,
Side member and a peripheral surface of the cylinder-side member facing the circumferential surface provided with the projection, or a circumferential surface of the rod-side member, and extends in a peripheral direction in which the projection comes into contact when the rod reaches the maximum projected state A maximum length contact portion,
A lock portion that is partially provided in a circumferential direction so as to face the maximum length contact portion in the axial direction and restricts the projection from coming into contact with the protrusion when the length is reduced from the maximum protruding state to prevent the rod from moving in the reduction direction;
Wherein the maximum length contact portion is axially spaced apart from the maximum length contact portion so as to guide the protrusion to a position opposed to the lock portion among circumferential directions of the maximum length contact portion when the rod becomes the maximum protruding state, And a guide portion provided between the guide portion and the guide portion. The lock apparatus according to claim 1, wherein the maximum length contact portion is a lockable position in which the range of the circumferential direction opposed to the lock portion is such that the rod can not move in the reduction direction when the projection is positioned within the range, Is a lock release position in which the rod is movable in the reduction direction when the projection is located in the range. 3. The cylinder apparatus according to claim 2, wherein the lockable position of the maximum length contact portion is flat. 3. The cylinder apparatus according to claim 2, wherein a recessed portion in which the projection is fitted is provided at the unlocking position of the maximum length contact portion. 3. The cylinder head according to claim 2, wherein the unlocked position of the maximum length contact portion is provided with a protrusion which is in contact with the projection when the cylinder and the rod relatively rotate at the lockable position to be in the lock disassembly position Device. 3. The apparatus according to claim 2, characterized in that a projection is provided between the lockable position and the unlocked position in the circumferential direction, the protruding portion being able to ride when the projection moves in the peripheral direction along the maximum length contact portion Device. The lock device according to any one of claims 1 to 6, wherein the lock portion and the guide portion are formed on one side and the other side of the extension portion, which is provided to be axially spaced apart from the maximum length contact portion Cylinder device. The cylinder apparatus according to any one of claims 1 to 6, wherein the lock portion is wider than the diameter of the projection. The cylinder device according to any one of claims 1 to 6, wherein the lock portion has a concave surface on a surface facing the maximum length contact portion. The cylinder device according to any one of claims 2 and 4 to 6, wherein the lockable position of the maximum length contact portion is provided with a recess to which the projection is fitted.

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