Forward and backward movement device

Abstract

An object of the present invention is to provide an advance / retract movement device capable of moving a locking member to a locked position regardless of the axial position of the advance / retract member, and capable of moving the advance / retract member to a retracted holding position even when the locking member is in the locked position. The advance and retreat moving device (1) comprises a housing (2), an advance and retreat member (3), a force applying member, a cam mechanism (C), and a locking member (5); the end portion of the advance and retreat member (3) on the side of the retreat direction (D2) comprises a convex portion (3a) protruding axially in the retreat direction (D2), and a concave portion (3b) formed in a concave shape relative to the convex portion (3a); the convex portion (3a) comprises a contact portion (CT) capable of contacting the contacted portion (5a) of the locking member (5) in the locked position; when the advance and retreat member (3) reaches the folding position from the advance holding position, the contact portion (CT) is located at a non-relative position in the axial direction relative to the contacted portion (5a); and when the advance and retreat member (3) is held in the retreat holding position, the contact portion (CT) is located at a relative position in the axial direction relative to the contacted portion (5a).

Description

Technical Field

[0001] The present invention relates to an advance and retreat movement device. Background Art

[0002] Devices for moving a rod relative to a housing, such as a device for locking a lid covering a fuel filling port of a vehicle, are configured to reciprocate between a position in which the rod protrudes from the housing and a position in which the rod is retracted to be accommodated in the housing (see, for example, Patent Document 1).

[0003] The device of patent document 1 comprises: a housing, a push rod (rod member) that moves between a forward position and a backward position relative to the housing, a biasing member that biases the push rod in a protruding direction, and a locking portion (locking member) that locks the push rod when the push rod is held in the backward position.

[0004] In Patent Document 1, the push rod is held in a predetermined forward holding position after it moves in the forward direction when the lid is opened. In addition, the push rod is held in a predetermined backward holding position after it moves in the backward direction when the lid is closed. The following further details the process of the push rod from being in the forward holding position to being held in the backward holding position. When the push rod in the forward holding position is pressed in the backward direction when the lid is closed, the push rod, after reaching the backward holding position, crosses the backward holding position and moves further in the backward direction. Then, the push rod is held in the backward holding position after it returns in the forward direction by the force of the force-applying member. In addition, in the process before being held in the forward holding position, the push rod moves in the backward direction from the backward holding position and is then held in the forward holding position by the force of the force-applying member.

[0005] In addition, the device of patent document 1 has a locking portion (locking member) for locking the push rod in the retreat holding position. The locking portion has an engaging member that engages with the pin-shaped sliding member of the push rod, and the engaging member moves in a direction perpendicular to the axis of the push rod to engage with the pin-shaped sliding member. Specifically, when the push rod is in the retreat holding position, the locking member of the locking portion moves toward the pin-shaped sliding member provided on the outer periphery of the push rod. Thus, the engaging member engages with the pin-shaped sliding member in the forward / backward direction of the push rod, locking the push rod. On the other hand, when the push rod is in the forward holding position, even if the locking member of the locking portion moves toward the push rod, the engaging member abuts against the end face of the pin-shaped sliding member to prevent the movement of the engaging member. Thus, when the push rod is in the forward holding position, the engaging member does not move to the locking position, preventing the push rod from being locked by mistake.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Laid-Open No. 2014-173422 Summary of the Invention

[0009] Problems to be solved by the invention

[0010] In the case of a device such as Patent Document 1, for example, when the advance / retract member is in the forward holding position, such as when the lid is open, even if the locking member is moved to the locked position, the locking member will not move to the locked position. Therefore, it is necessary to move the advance / retract member from the forward holding position to the reverse holding position and then to move the locking member to the locked position again. This makes the locking operation of the advance / retract member cumbersome. In addition, if the user forgets to lock the member while the advance / retract member is in the reverse holding position, the advance / retract member becomes unlocked (for example, the lid can be opened).

[0011] Therefore, the object of the present invention is to provide an advance and retreat movement device, which can move the locking member to the locking position regardless of the axial position of the advance and retreat member, and can move the advance and retreat member to the rearward holding position even when the locking member is in the locking position, so that locking at the rearward holding position can be easily performed.

[0012] Technical solutions to problems

[0013] The forward and backward movement device of the present invention comprises: a shell; an advance and retreat member that can rotate about an axis and move relative to the shell in a forward direction protruding from the shell and in a backward direction that is a direction opposite to the forward direction; a force applying member that applies force to the advance and retreat member in the forward direction; a cam mechanism that is configured to maintain the advance and retreat member in a forward holding position after moving in the forward direction and a backward holding position after moving in the backward direction; and a locking member that can move between a locked position that restricts the advance and retreat member from moving toward the forward holding position and an unlocked position that allows the advance and retreat member to move toward the forward holding position when the advance and retreat member is in the backward holding position, and the advance and retreat member is configured to, when moving between the forward holding position and the backward holding position, move further backward relative to the backward holding position The folding position on the direction side, the advance and retreat member is provided with an abutment portion on the retreat direction side, and the locking member is provided with an abutted portion on the forward direction side. When the locking member is in the locking position and the advance and retreat member reaches the folding position from the forward holding position, the abutment portion of the advance and retreat member is located at a non-opposite position in the axial direction relative to the abutted portion of the locking member. When the advance and retreat member rotates around the axis from the folding position and is maintained in the retreat holding position, the abutment portion of the advance and retreat member is located at a position which is on the forward direction side and opposite in the axial direction relative to the abutted portion of the locking member. When the advance and retreat member is maintained in the retreat holding position, the axial spacing between the abutment portion and the abutted portion is set to a distance that the advance and retreat member cannot reach the folding position from the retreat holding position.

[0014] Effects of the Invention

[0015] According to the advance and retreat movement device of the present invention, the locking member can be moved to the locking position regardless of the axial position of the advance and retreat member. Even when the locking member is in the locking position, the advance and retreat member can be moved to the retreat holding position, and locking at the retreat holding position can be easily performed. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a perspective view showing an advance and retreat movement device according to one embodiment of the present invention.

[0017] Figure 2 This is a schematic diagram showing the relationship between the locking portion of the forward and backward movement member and the locked portion on the operation target side of the fuel cap.

[0018] Figure 3 This is a schematic perspective view showing an example in which the forward and backward movement device of the present embodiment is applied to a cover opening and closing device.

[0019] Figure 4This is a perspective view of the forward and backward movement device with a portion of the housing cut away, showing the forward and backward member in the forward holding position and the locking member in the unlocking position.

[0020] Figure 5 This is a perspective view of the forward and backward movement device with a portion of the housing cut away, showing the forward and backward movement member in the rearward holding position and the locking member in the unlocking position.

[0021] Figure 6 Is the advance and retreat component from Figure 5 The illustrated state is a perspective view of the forward and backward movement device with a portion of the housing cut away, in which the device is moved in the rearward direction and is located at the folded position, and the locking member is located at the unlocked position.

[0022] Figure 7 This is a perspective view of the forward and backward movement device with a portion of the housing cut away, with the forward and backward member in the forward holding position and the locking member in the locked position.

[0023] Figure 8 This is a perspective view of the forward and backward movement device with a portion of the housing cut away, with the forward and backward member in the retracted holding position and the locking member in the locked position.

[0024] Figure 9 It indicates that the advance and retreat components are from Figure 8 The state shown is a perspective view of a state in which the vehicle moves in the rearward direction and the contact portion of the advancing and retracting member contacts the contacted portion of the locking member.

[0025] Figure 10 This is a diagram of the forward and backward movement device viewed from the bottom surface of the housing in the forward direction.

[0026] Figure 11 It is a three-dimensional diagram of the advance and retreat components.

[0027] Figure 12 It is a bottom view of the advance and retreat component.

[0028] Figure 13 This is a schematic diagram of the advance / retract member and the cam mechanism developed on a plane when the advance / retract member is in the advance holding position and the lock member is in the unlocking position.

[0029] Figure 14 It indicates that the advance and retreat components are from Figure 13 The state shown is a schematic diagram of a state in which the vehicle is moving in the rearward direction and the advance / retract member is moving toward the folded position.

[0030] Figure 15 It indicates that the advance and retreat components are from Figure 14 The state shown is a schematic diagram showing a state in which the forward-moving member has reached the rearward holding position after moving in the forward-moving direction.

[0031] Figure 16 It indicates that the advance and retreat components are from Figure 15The state shown is a schematic diagram of a process in which the advance / retract member moves toward the advance holding position via the folded position while moving in the rearward direction.

[0032] Figure 17 This is a schematic diagram of the advance / retract member and the cam mechanism developed on a plane, showing a state in which the advance / retract member is moved from the advance holding position toward the retreat direction with the lock member in the lock position.

[0033] Figure 18 It indicates that the advance and retreat components are from Figure 17 The state shown is a schematic diagram of the process of moving from the folded position to the retreat holding position.

[0034] Figure 19 It indicates that the advance and retreat components are from Figure 18 The state shown is a schematic diagram of a state in which the vehicle moves and is held in the retreat holding position. DETAILED DESCRIPTION

[0035] Hereinafter, with reference to the accompanying drawings, an advance and retreat movement device according to an embodiment of the present invention will be described. In addition, the embodiment shown below is merely an example, and the advance and retreat movement device according to the present invention is not limited to the following embodiment. In addition, in this specification, "perpendicular to A" and expressions similar thereto refer not only to a direction completely perpendicular to A, but also to a direction approximately perpendicular to A. In addition, in this specification, "parallel to B" and expressions similar thereto refer not only to a direction completely parallel to B, but also to a direction approximately parallel to B. In addition, in this specification, "C-shape" and expressions similar thereto refer not only to a complete C-shape, but also to a shape that is reminiscent of a C-shape in appearance (approximately a C-shape).

[0036] like Figure 1 As shown, the forward and backward movement device 1 includes: a housing 2; and an advance and retreat member 3, which can move relative to the housing 2 in a forward direction D1 protruding from the housing 2 and a backward direction D2 which is a direction opposite to the forward direction D1 while rotating around an axis X. In addition, the two directions of the forward direction D1 and the backward direction D2 are collectively referred to as the axis X direction. In this specification, the axis X refers to the axis of the advance and retreat member 3 along the forward and backward (advance and retreat) direction, that is, the advance and retreat axis. In this embodiment, the axis X corresponds to the longitudinal axis of the advance and retreat member 3, which is a member that is slender and axial in the forward and retreat directions.

[0037] The forward and backward movement device 1 interacts with a predetermined operation object when the forward and backward member 3 moves forward and backward relative to the housing 2. In addition, the interaction between the forward and backward member 3 and the operation object can be either the forward and backward member 3 acting on the operation object or the operation object acting on the forward and backward member 3. In this embodiment, by operating the cover L (refer to Figure 2 and Figure 3), the advance and retreat member 3 is operated. However, the interaction between the advance and retreat member 3 and the operation object is not particularly limited, and it can also be other effects such as pressing the operation object by the advance and retreat member 3 to operate the operation object.

[0038] The purpose of the forward and backward movement device 1 is not particularly limited as long as it can interact with a predetermined operation object when the forward and backward member 3 moves forward and backward relative to the housing 2. Figure 3 As shown, the forward / retractable movement device 1 is adapted for use in a lid opening / closing device D comprising the forward / retractable movement device 1, a base B having an opening Ba to which the forward / retractable movement device 1 is mounted, and a lid L capable of opening and closing the opening Ba of the base B and engaging with the end portion (engaging portion 31) on the forward direction D1 side of the forward / retractable movement member 3. More specifically, the lid L is a fuel or power supply lid for a vehicle, and the forward / retractable movement device 1 is adapted for use in the lid opening / closing device D for a vehicle, configured to open and close the fuel or power supply lid L for the vehicle being operated. Furthermore, the vehicle fuel is not limited to light oil or gasoline, but refers to any fuel capable of operating the vehicle.

[0039] In this embodiment, if Figure 3 As shown, the lid opening and closing device D comprises: a lid (hereinafter sometimes referred to as a fuel lid) L which is openably and closably provided on a vehicle body (hereinafter referred to as a vehicle body B) serving as a base via a hinge H, and an advance and retreat moving device 1 which is installed on the vehicle body B and which locks and releases the fuel lid L by the advance and retreat of an advance and retreat member 3. The fuel lid L has a locked portion La on the operating object side which is locked by a locking portion 31 provided on the front end of the advance and retreat member 3. In the present embodiment, the locking portion 31 is a rectangular plate-shaped locking piece, and the locked portion La on the operating object side is a locking hole having a rectangular opening capable of locking the locking portion 31. As shown Figure 2 As shown by the single dot chain line, when the locking portion 31 is configured to be detachable from the opening of the locked portion La on the operation object side, the locking between the locking portion 31 and the locked portion La on the operation object side can be released. Figure 2 When the state shown by the single-dot chain line is rotated to the state shown by the solid line and becomes a configuration that cannot be separated from the opening of the locked portion La on the operation object side, the locking portion 31 is locked with the locked portion La on the operation object side.

[0040] Although the details will be described later, in this embodiment, the fuel lid L is pressed from the locked state to operate the forward and backward movement device 1, thereby releasing the engagement between the locking portion 31 and the locked portion La on the operation target side, and opening the fuel lid L. The fuel lid L may be opened by a spring biased in the direction of opening the fuel lid L when the engagement between the locking portion 31 and the locking portion La on the operation target side is released. Alternatively, the fuel lid L may be opened slightly by being pressed in the opening direction by the forward and backward movement member 3, and then opened manually. Figure 3When the fuel lid L is closed in the state shown in FIG. 1 , the fuel lid L is manually moved in the closing direction. As a result, the advancing and retreating member 3 is pressed by the fuel lid L, and the advancing and retreating member 3 retreats. At this time, the locking portion 31 is moved from the locking portion 31 to the locking portion 31. Figure 2 The state indicated by the one-dot chain line is rotated to the state indicated by the solid line, and is locked to the locked portion La on the operation target side, thereby maintaining the closed state of the fuel lid L.

[0041] Next, the forward and backward movement device 1 will be described in detail.

[0042] like Figures 4 to 9 As shown, the forward and backward movement device 1 includes: a force member 4, which applies force to the forward and backward member 3 in the forward direction D1; a cam mechanism C, which is configured to keep the forward and backward member 3 in the forward holding position after moving in the forward direction D1 (refer to Figure 4 and Figure 7 ) and the retreat holding position after moving in the retreat direction D2 (refer to Figure 5 and Figure 8 ); locking member 5, when the advance and retreat member 3 is in the retracted holding position, can be in the locking position that limits the movement of the advance and retreat member 3 to the forward holding position (reference Figures 7 to 9 ), and an unlocked position (refer to Figures 4 to 6 ). In addition, Figures 4 to 9 In order to facilitate observation of the interior of the housing 2, the housing 2 is partially removed for illustration.

[0043] The housing 2 accommodates the structural components of the forward and backward movement device 1. Figure 4 and Figure 10 As shown, the housing 2 houses a portion of the advance / retract member 3, the biasing member 4, the cam mechanism C, and the locking member 5. Furthermore, the housing 2 only needs to house at least a portion of each component of the advance / retract movement device 1 and does not necessarily need to house all of the components. The shape and structure of the housing 2 are not particularly limited as long as it can house the components of the advance / retract movement device 1. Furthermore, the housing 2 may be composed of a single component or a plurality of components.

[0044] In this embodiment, if Figure 4 and Figure 10 As shown, the housing 2 has an advance and retreat member accommodating portion 21 for accommodating the advance and retreat member 3 and a locking member accommodating portion 22 for accommodating the locking member 5. The advance and retreat member accommodating portion 21 has an accommodating space for accommodating the advance and retreat member 3 in the axis X direction. Figure 4As shown, the advance / retract member housing 21 is formed of a cylindrical body with an internal space. More specifically, the advance / retract member housing 21 is formed of a cylindrical body having a second cam surface Cb and a guide portion Cc, which will be described later. The locking member housing 22 houses the locking member 5 so that it can move between a locked position and an unlocked position. In this embodiment, the locking member housing 22 houses the locking body 51 of the locking member 5, the motor 521 of the driving unit 52, and the threaded shaft 522.

[0045] In addition, in this embodiment, Figure 4 As shown, the housing 2 has a protrusion 23, which protrudes from the bottom surface 2a opposite to the end portion on the side of the retreat direction D2 of the advance and retreat member 3 in the axis X direction, and has a first cam surface Ca described later. The protrusion 23 is provided at a position opposite to the advance and retreat member accommodating portion 21 in the axis X direction. A plurality of protrusions 23 (four in this embodiment) are provided separately around the axis X direction. In addition, in this embodiment, the housing 2 has a support shaft 24 that protrudes from the bottom surface 2a in the forward direction D1 and supports the force-applying member 4. The support shaft 24 extends coaxially with the axis X of the advance and retreat member 3.

[0046] The advance / retract member 3 is a member that advances / retracts relative to the housing 2 in the direction of the axis X. In this embodiment, the advance / retract member 3 is held in the advance holding position by being moved in the advance direction D1 by the cam mechanism C (see FIG. Figure 4 and Figure 7 ), and moves in the backward direction D2 relative to the forward holding position and is held in the backward holding position (refer to Figure 5 and Figure 8 ).like Figures 4 to 6 、 Figures 13 to 16 As shown, the advance and retreat member 3 is configured so that when moving between the advance holding position and the retreat holding position, the member 3 passes through a folded position further toward the retreat direction D2 side relative to the retreat holding position (see FIG. Figure 6 、 Figure 14 The double-dotted line and Figure 16 When the advance / retract member 3 advances / retracts in the direction of the axis X, it moves while being rotated about the axis X by the cam mechanism C. Specifically, the advance / retract member 3 is configured so as to be rotated about the axis X by the cam mechanism C when moving between the retreat holding position and the folding position.

[0047] In this specification, the "advance holding position" is a predetermined position of the advance / retract member 3 where the advance / retract member 3 is held while being moved in the advance direction D1 relative to the retreat holding position (see Figure 4 and Figure 7In this embodiment, the forward holding position is the position of the advance / retract member 3 when the fuel lid L is open, and is the position where the advance / retract member 3 is most protruded from the housing 2 in the forward direction D1. The "reverse holding position" is the predetermined position of the advance / retract member 3 where the advance / retract member 3 is held while moving in the reverse direction D2 relative to the forward holding position (see Figure 5 and Figure 8 ). In the present embodiment, the retracted holding position is the position of the advance / retract member 3 when the fuel lid L is in the closed state. In the present embodiment, the retracted holding position is a position slightly closer to the forward direction D1 side relative to the folded position. In addition, in the present embodiment, the retracted holding position of the advance / retract member 3 is a position offset by 90° in the direction around the axis X relative to the forward holding position. The "folded position" is a position further closer to the backward direction D2 side relative to the retracted holding position (refer to Figure 6 ). In this embodiment, the folding position is the position in the direction of the axis X at which the advance / retract member 3 switches the traveling direction from the retreat direction D2 to the forward direction D1 when the advance / retract member 3 is moved from the forward holding position to the backward holding position or when the advance / retract member 3 is moved from the backward holding position to the forward holding position by the cam mechanism C. In addition, the folding position (first folding position) in which the traveling direction is switched when the advance / retract member 3 is moved from the forward holding position to the backward holding position. Figure 14 The position in the X-axis direction of the forward and backward member 3 is the second turning position (refer to the second turning position) at which the forward and backward member 3 switches the direction of travel when the forward and backward member 3 moves from the backward holding position to the forward holding position. Figure 16 The position of the axis X direction (shown by the double-dotted line) can be different.

[0048] As described above, the advancing and retreating member 3 interacts with a predetermined operation object when advancing and retreating in the direction of the axis X. In this embodiment, when the advancing and retreating member 3 moves to the forward holding position, the engagement state with the fuel cover L is released, and the fuel cover L is opened. When the advancing and retreating member 3 moves to the backward holding position, the engagement state with the fuel cover L is engaged, and the fuel cover L is locked. In this embodiment, as Figure 4 As shown, the advance / retract member 3 is configured to be biased in the forward direction D1 by a biasing member 4 such as a coil spring, thereby moving from the retracted holding position to the forward holding position. Conversely, the advance / retract member 3 is pressed against the force of the biasing member 4 in the forward direction D1, thereby moving from the forward holding position to the reverse holding position.

[0049] In this embodiment, if Figure 11As shown, the advance / retract member 3 includes a main body 32 extending along the axis X and a locking portion 31 provided at one end (front end) of the main body 32 in the axis X. Furthermore, the advance / retract member 3 has a convex portion 3a and a concave portion 3b, described below, on the other end (end in the rearward direction D2) of the advance / retract member 3 (main body 32). Furthermore, the advance / retract member 3 has a guided portion Cd on the outer peripheral side of the advance / retract member 3 around the axis X.

[0050] In this embodiment, if Figure 11 As shown in FIG. 3 , the main body 32 is a cylindrical or columnar member extending in the direction of the axis X. More specifically, the main body 32 is formed into a cylindrical shape, such as Figures 4 to 9 As shown in FIG, it is guided by the cylindrical advancing and retreating member accommodating portion 21. Figure 11 and Figure 12 As shown, the main body 32 includes a biasing member housing portion 321 inside the main body 32 , and a portion of the biasing member 4 is housed in the biasing member housing portion 321 .

[0051] The locking portion 31 is provided at one end side (the side in the forward direction D1) of the main body 32 and is locked to an operation object such as the fuel cap L. In this embodiment, Figure 2 As shown, the locking portion 31 is locked with the locked portion La on the operation object side. By using the cam mechanism C to rotate the advance and retreat member 3 around the axis X direction, the locking portion 31 is in the locked state (refer to Figure 2 solid line) and the locked state (refer to Figure 2 (single-dot chain line). In this embodiment, the locking portion 31 is a generally rectangular plate-shaped member provided outside the housing 2 at the end of the main body 32 on the side in the forward direction D1. The shapes and structures of the locking portion 31 and the engaged portion La on the operating side are not particularly limited, as long as the locking portion 31 can be engaged and disengaged with the engaged portion La on the operating side, allowing the fuel cap L to be opened and closed.

[0052] The cam mechanism C moves the advance / retract member 3 between the forward holding position, the folded position, and the backward holding position, and maintains the advance / retract member 3 at the forward holding position and the backward holding position. When the cam mechanism C moves the advance / retract member 3 between the forward holding position and the backward holding position, it guides the advance / retract member 3 so that the advance / retract member 3 passes through the folded position that is further toward the backward direction D2 side relative to the backward holding position. More specifically, as Figures 13 to 15 As shown, the cam mechanism C is configured such that when the advance / retract member 3 is moved from the advance holding position to the retreat holding position, after the advance / retract member 3 reaches the folded position, the urging member 4 moves the advance / retract member 3 from the folded position to the retreat holding position and holds it. Figure 15 and Figure 16As shown, the cam mechanism C is configured such that when the advance / retract member 3 is moved from the retracted holding position to the forward holding position, after the advance / retract member 3 reaches the folded position from the retracted holding position, the urging member 4 moves the advance / retract member 3 from the folded position to the forward holding position and holds the advance / retract member 3. Figures 13 to 19 This is a schematic diagram showing the advance / retract member 3 and the cam mechanism C unfolded on a plane for easy understanding. Figures 13 to 19 The up and down directions in the diagram are the axis X direction (the up direction is the forward direction D1 , and the down direction is the backward direction D2 ), and the left direction is a direction D3 around the axis X direction.

[0053] The cam mechanism C rotates the advance / retract member 3 around the axis X when the advance / retract member 3 moves from the advance holding position to the retreat holding position and when the advance / retract member 3 moves from the retreat holding position to the advance holding position. More specifically, when the advance / retract member 3 moves from the advance holding position to the retreat holding position, the cam mechanism C rotates the advance / retract member 3 around the axis X in one direction D3 ( Figure 4 Reference) rotates, and when moving from the retracted holding position to the forward holding position, it also rotates in one direction D3 (the same direction) around the axis X through the cam mechanism C. The angle of rotation of the advance / retract member 3 from the state in which the advance / retract member 3 is maintained at the forward holding position to the state in which it is maintained at the retracted holding position, or from the state in which the advance / retract member 3 is maintained at the retracted holding position to the state in which it is maintained at the forward holding position, is not particularly limited. In the present embodiment, the advance / retract member 3 is configured to rotate approximately 90° from the state in which the advance / retract member 3 is maintained at the retracted holding position to the state in which it is maintained at the forward holding position. Similarly, the advance / retract member 3 is configured to rotate approximately 90° from the state in which the advance / retract member 3 is maintained at the forward holding position to the state in which it is maintained at the retracted holding position.

[0054] The structure of the cam mechanism C is not particularly limited as long as it can move the advance and retreat member 3 between the advance holding position, the folding position, and the retreat holding position, and can maintain the advance and retreat member 3 at the advance holding position and the retreat holding position. Figures 13 to 16As shown, the cam mechanism C has a first cam surface Ca provided on the housing 2, a second cam surface Cb provided on the housing 2, a guide portion Cc provided on the housing 2 and extending in the axis X direction of the advance and retreat member 3, and a guided portion Cd provided on the outer periphery of the advance and retreat member 3, having a first contact surface Cd1 in contact with the first cam surface Ca and a second contact surface Cd2 in contact with the second cam surface Cb and capable of being guided by the guide portion Cc. In addition, in this specification, when a certain component / portion is referred to as being "provided in the housing 2", it means that the certain component / portion can be provided integrally with other portions of the housing 2 or separately from other portions of the housing 2. In the case where a certain component / portion is provided separately from other portions of the housing 2, as long as the purpose of the invention can be achieved, it can be fixed to other portions of the housing 2 or can be relatively movable relative to other portions of the housing 2.

[0055] like Figure 14 and Figure 16 As shown, the first cam surface Ca is inclined in such a manner that when the advance / retract member 3 moves in the retreat direction D2 and toward the folded position, it contacts the first contact surface Cd1 of the guided portion Cd, causing the advance / retract member 3 to rotate in one direction D3 about the axis X. The first cam surface Ca is inclined in such a manner that when the advance / retract member 3 attempts to move further in the retreat direction D2 (is pressed) while in contact with the first contact surface Cd1, a force is generated that causes the advance / retract member 3 to rotate in one direction D3 about the axis X. The inclination angle of the first cam surface Ca is not particularly limited as long as it is an inclination angle that generates a force that causes the advance / retract member 3 to rotate in one direction D3 about the axis X when the advance / retract member 3 attempts to move further in the retreat direction D2 (is pressed) while in contact with the first contact surface Cd1.

[0056] In this embodiment, the first cam surface Ca is provided on the housing 2. More specifically, as Figure 4 As shown, the first cam surface Ca is formed by the end (upper end) on the advancing direction D1 side of the protrusion 23 protruding from the bottom surface 2a of the housing 2. In this embodiment, four protrusions 23 are provided on the bottom surface 2a of the housing 2 at equal intervals in the direction around the axis X, and the first cam surface Ca is provided on each of the four protrusions 23. Figure 13 As shown, one of the first cam surfaces Ca is provided at a position corresponding to the position of the guided portion Cd in the direction around the axis X when the advance / retract member 3 is held in the advance holding position. Figure 15As shown, the other of the first cam surfaces Ca is provided at a position corresponding to the position of the guided portion Cd in the direction around the axis X when the advance / retract member 3 is held in the retracted holding position. Therefore, when the advance / retract member 3 moves in the retracted direction D2 from the advance holding position or the retracted holding position, the first cam surface Ca can reliably contact the first contact surface Cd1 of the guided portion Cd.

[0057] like Figure 14 and Figure 15 As shown, the second cam surface Cb is inclined in such a manner that when the advance / retract member 3 is held in the retreat / retract position from the advance / retract position via the folded position, when the advance / retract member 3 moves from the folded position to the advance direction D1, it contacts the second contact surface Cd2 of the guided portion Cd, thereby rotating the advance / retract member 3 in one direction D3 around the axis X. Figure 15 As shown, the second cam surface Cb is inclined so that, when the advancement / retraction member 3 attempts to move further in the advancing direction D1 (due to the force of the urging member 4) while in contact with the second contact surface Cd2, a force is generated that causes the advancement / retraction member 3 to rotate in one direction D3 about the axis X. The inclination angle of the second cam surface Cb is not particularly limited as long as it is an inclination angle that generates a force that causes the advancement / retraction member 3 to rotate in one direction D3 about the axis X when the advancement / retraction member 3 attempts to move further in the advancing direction D1 while the second cam surface Cb is in contact with the second contact surface Cd2.

[0058] In this embodiment, the second cam surface Cb is provided on the housing 2. More specifically, as Figures 4 to 9 As shown, the second cam surface Cb is provided in the advance and retreat member accommodating portion 21 of the housing 2. In this embodiment, the second cam surface Cb is formed by an inclined surface (an inclined surface at the end portion on the retreat direction D2 side) provided in the advance and retreat member accommodating portion 21 formed by the cylindrical body. Figure 13 As shown, at the end portion of the advance / retract member housing portion 21 on the retreat direction D2 side, two second cam surfaces Cb are provided separately in the direction around the axis X. In this embodiment, as shown in FIG. Figure 13 As shown, one second cam surface Cb extends from one end portion ( 1 ) of one first cam surface Ca (protrusion 23 ) on the side in one direction D3 in the direction around the axis X. Figure 13 The left end of the second cam surface Cb extends to the end of the adjacent first cam surface Ca (protrusion 23) on the side in one direction D3 in the direction around the axis X. The end of the second cam surface Cb on the side in one direction D3 in the direction around the axis X (at Figure 13 The left end portion of the second cam surface Cb has a stop portion ST (see FIG. 1 ) for stopping the guided portion Cd moving in one direction D3 along the second cam surface Cb at a predetermined position (retracted holding position). Figure 13The stop portion ST is formed by a wall portion extending in the retreat direction D2 relative to the inclined surface of the second cam surface Cb. In addition, the end portion of the second cam surface Cb in the other direction side in the direction around the axis X (at Figure 13 In the embodiment, the right end portion of the second cam surface Cb is connected to the open end portion of the guide portion Cc on the side of the retreat direction D2.

[0059] The guide portion Cc guides the guided portion Cd of the advance / retract member 3 in the direction of the axis X. The guide portion Cc extends in the direction of the axis X and guides the guided portion Cd in the direction of the axis X when the advance / retract member 3 moves from the advance holding position toward the retreat direction D2 or when the advance / retract member 3 moves toward the advance holding position in the advance direction D1, thereby assisting the advance / retract member 3 in moving smoothly in the direction of the axis X.

[0060] In this embodiment, the guide portion Cc is provided in the housing 2. More specifically, the guide portion Cc is provided in the advance and retreat member accommodating portion 21 of the housing 2. Figures 4 to 9 As shown, the guide portion Cc is composed of a guide groove that is cut out with a predetermined width in the direction of the axis X on the side surface of the advancing and retreating member accommodating portion 21 composed of a cylindrical body. In order to guide the guided portion Cd in the guide portion Cc, the distance between a pair of side edges extending in the direction of the axis X, that is, the width of the guide portion Cc (the width in the direction around the axis X) is greater than the width of the guided portion Cd in the direction around the axis X. The end portion of the guide portion Cc on the side of the advancing direction D1 has a stop portion ST2 (see Figure 13 ), the stop portion ST2 contacts the second contact surface Cd2 of the guided portion Cd, and the advancing / retracting member 3 is stopped and retained in the advanced holding position. The end portion of the guide portion Cc on the retreat direction D2 side is open, and the guided portion Cd can move from the inner side of the guide portion Cc toward the first cam surface Ca in the retreat direction D2, and from the retreat direction D2 side of the guide portion Cc toward the inner side of the guide portion Cc in the advance direction D1.

[0061] The cam mechanism C has an introduction portion Ce which is provided when the advance / retract member 3 moves from the retreat holding position to the advance holding position via the folded position (see FIG. Figure 15 and Figure 16), guiding the guided portion Cd toward the guide portion Cc. The introduction portion Ce is inclined in such a manner that, when in contact with the second contact surface Cd2 of the guided portion Cd, when the advance / retract member 3 (by the force of the force-applying member 4) attempts to move further in the forward direction D1, a force is generated that causes the advance / retract member 3 to rotate in one direction D3 about the axis X. The inclination angle of the introduction portion Ce is not particularly limited as long as it is an inclination angle that causes the advance / retract member 3 to rotate in one direction D3 about the axis X when the advance / retract member 3 attempts to move further in the forward direction D1 when the introduction portion Ce is in contact with the second contact surface Cd2.

[0062] In this embodiment, the introduction portion Ce is provided in the housing 2. More specifically, the introduction portion Ce is provided in the advance and retreat member accommodating portion 21 of the housing 2. Figure 4 As shown, the introduction portion Ce is formed by an inclined surface (an inclined surface at the end portion on the side of the retreat direction D2) provided on the advancing and retreating member accommodating portion 21 formed by a cylindrical body. Figure 13 As shown, two introduction portions Ce are provided at the end portion of the advance / retract member housing 21 on the side in the retreat direction D2, spaced apart in the direction around the axis X. In this embodiment, the introduction portion Ce is provided adjacent to the second cam surface Cb with the stop portion ST interposed therebetween in the direction around the axis X. Furthermore, the introduction portion Ce is provided between the guide portion Cc and the second cam surface Cb in the direction around the axis X.

[0063] The guided portion Cd is provided on the advancing and retreating member 3. Figures 13 to 16 As shown, the guided portion Cd is guided by the first cam surface Ca, the second cam surface Cb, the guide portion Cc, etc., thereby the advance and retreat member 3 moves to the advance holding position, the retreat holding position, and the folded position. Figure 11 and Figure 12 As shown, the guided portion Cd is provided on the outer periphery of the advance / retract member 3. More specifically, the guided portion Cd protrudes from a side surface extending in the direction around the axis X of the main body 32 of the advance / retract member 3. The guided portion Cd has a first contact surface Cd1 that contacts the first cam surface Ca and a second contact surface Cd2 that contacts the second cam surface Cb. Furthermore, the guided portion Cd has a pair of opposing side edges extending in the direction of the axis X, facing a pair of side edges of the guide portion Cc. When the guided portion Cd of the advance / retract member 3 is guided by the guide portion Cc, the pair of opposing side edges can slide relative to the pair of side edges of the guide portion Cc.

[0064] The shape of the guided portion Cd is not particularly limited as long as the guided portion Cd is guided by the first cam surface Ca, the second cam surface Cb, the guide portion Cc, etc. and the advance / retract member 3 can move to the advance holding position, the retreat holding position, and the folded position. Figure 13As shown, the guided portion Cd is formed in an isosceles trapezoidal shape with one side in the direction around the axis X being an upper base and the other side being a lower base.

[0065] The first contact surface Cd1 is a surface that contacts the first cam surface Ca when the advancing and retreating member 3 moves in the retreat direction D2. Figure 14 As shown, while the first contact surface Cd1 is in contact with the first cam surface Ca, the advancement / retraction member 3 further moves in the rearward direction D2, thereby causing the advancement / retraction member 3 to rotate in one direction D3 about the axis X. The shape and structure of the first contact surface Cd1 are not particularly limited, as long as the advancement / retraction member 3 can rotate in one direction D3 about the axis X by further moving in the rearward direction D2 while in contact with the first cam surface Ca. In this embodiment, the first contact surface Cd1 is inclined in the same direction as the inclination angle of the first cam surface Ca.

[0066] When the advance / retract member 3 moves from the forward holding position to the backward holding position and moves from the folded position to the forward direction D1, the second contact surface Cd2 contacts the second cam surface Cb. In addition, in the present embodiment, when the advance / retract member 3 moves from the backward holding position to the forward holding position and moves from the folded position to the forward direction D1, the second contact surface Cd2 contacts the introduction portion Ce. Figure 15 and Figure 16 As shown, when the second contact surface Cd2 is in contact with the second cam surface Cb or the introduction portion Ce, the advancement / retraction member 3 further moves in the advancement direction D1, thereby rotating the advancement / retraction member 3 in one direction D3 about the axis X. The shape and structure of the second contact surface Cd2 are not particularly limited as long as the advancement / retraction member 3 further moves in the advancement direction D1 while in contact with the second cam surface Cb or the introduction portion Ce can rotate the advancement / retraction member 3 in one direction D3 about the axis X. In this embodiment, the second contact surface Cd2 is inclined in the same direction at an angle corresponding to the inclination angle of the second cam surface Cb and the introduction portion Ce.

[0067] When the locking member 5 is in the locking position, the forward / retractable member 3 is restricted from moving from the backward holding position to the forward holding position (see Figure 9 and Figure 19 More specifically, the locking member 5 restricts the movement of the advance / retract member 3 from the retreat holding position to the advance holding position by restricting the movement of the advance / retract member 3 from the retreat holding position to the folded position in the retreat direction D2.

[0068] As mentioned above, the locking member 5 is in the locked position (refer to Figure 10 solid line position) and unlocked position (refer to Figure 10The locking position of the locking member 5 is a position that can restrict the movement of the advance and retreat member 3 to the forward holding position when the advance and retreat member 3 is in the retreat holding position. More specifically, the locking position is a position that can block the movement of the advance and retreat member 3 in the retreat direction D2 when the advance and retreat member 3 is about to move from the retreat holding position to the folding position so that the advance and retreat member 3 cannot reach the folding position from the retreat holding position (refer to Figure 19 ).like Figure 4 and Figures 17 to 19 As shown, the locking member 5 has an abutted portion 5a provided on the forward direction D1 side of the locking member 5. The abutted portion 5a abuts against the abutment portion CT of the advance / retract member 3, which will be described later, to restrict the movement of the advance / retract member 3 in the backward direction D2. In addition, in this embodiment, the locking member 5 in the locked position restricts the movement of the advance / retract member 3 in the backward direction D2, but the movement of the advance / retract member 3 in the forward direction D1 and the rotation around the axis X are not restricted. In addition, the unlocked position is a position in which the locking member 5 disengages from the movement trajectory of the advance / retract member 3 between the forward holding position and the backward holding position, allowing the advance / retract member 3 to move toward the forward holding position.

[0069] In this embodiment, if Figure 10 As shown, the locking member 5 moves from a direction perpendicular to the axis X to a direction close to the axis X, from the unlocked position (refer to Figure 10 double-dotted line) to the locked position (refer to Figure 10 However, the movement direction of the locking member 5 is not particularly limited as long as it is set to be able to move between the locked position and the unlocked position. For example, the locking member 5 can also move from the unlocked position to the locked position in the axis X direction (for example, the locking member 5 can also move from the unlocked position to the forward direction D1 (in the Figure 4 Move from bottom to top to reach the locked position).

[0070] The shape and structure of the locking member 5 are not particularly limited as long as they can move between the locked position and the unlocked position. Figures 4 to 10 As shown, the lock member 5 includes a lock body 51 that can abut against the advance / retract member 3 and a drive portion 52 that moves the lock body 51 to a locked position and an unlocked position.

[0071] When the locking body 51 is in the locked position, it contacts the contact portion CT of the advance / retract member 3, thereby limiting the movement of the advance / retract member 3 in the backward direction D2 to a predetermined range, thereby limiting the advance / retract member 3 from reaching the folded position. Figures 4 to 9 As shown, the lock body 51 has an abutted portion 5 a that faces the abutting portion CT of the advancing and retracting member 3 in the axis X direction when located at the locked position.

[0072] The shape and structure of the locking body 51 are not particularly limited as long as they can limit the movement of the advance / retract member 3 in the backward direction D2 to a predetermined range by abutting against the abutment portion CT of the advance / retract member 3 and restrict the advance / retract member 3 from reaching the folded position. Figures 4 to 10 As shown, the locking body 51 has a driven portion 511 driven by the driving portion 52, and an extended portion 512 extending from the driven portion 511 and having an abutted portion 5a. In the present embodiment, the driven portion 511 has an internal threaded portion that is screwed into the outer periphery of the threaded shaft 522 of the driving portion 52. When the threaded shaft 522 rotates around the axis, the driven portion 511 is restricted from rotating together with the threaded shaft 522. Thus, when the threaded shaft 522 rotates around the axis, the locking body 51 including the driven portion 511 moves along the axial direction of the threaded shaft 522 according to the rotation direction of the threaded shaft 522. Thus, the locking body 51 can move to a locked position and an unlocked position. The shape of the extended portion 512 is not particularly limited, but in the present embodiment, it extends in an L-shape. The abutted portion 5a is provided as a flat surface on the forward direction D1 side of the front end of the extended portion 512. In addition, as shown Figures 7 to 9 As shown, the extended portion 512 is configured to enter the space between a pair of protruding portions 23 adjacent to each other in the direction around the axis X when the lock member 5 is located at the lock position.

[0073] The drive unit 52 moves the lock body 51 to the locked position and the unlocked position. The structure of the drive unit 52 is not particularly limited as long as it can move the lock body 51 to the locked position and the unlocked position. In this embodiment, the drive unit 52 is an electric drive unit, but it can also be a manual drive unit.

[0074] In this embodiment, if Figures 4 to 10 As shown, the driving portion 52 includes a motor 521 capable of forward and reverse rotation, and a threaded shaft 522 that rotates by the driving force of the motor 521. The threaded shaft 522 is a shaft member having an external thread formed on the outer periphery. As described above, the threaded shaft 522 is screwed into the internal thread of the driven portion 511 provided on the locking body 51. When the threaded shaft 522 rotates in one direction by the driving force of the motor 521, the locking body 51, whose rotation is restricted along with the threaded shaft 522, moves along the axial direction of the threaded shaft 522 toward the locking position (from the locking position). Figure 10 In addition, when the threaded shaft 522 is rotated in the other direction by the driving force of the motor 521, the locking body 51 moves along the axial direction of the threaded shaft 522 toward the unlocking position (from the position indicated by the double-dashed line to the position indicated by the solid line). Figure 10 The position shown by the solid line moves toward the position shown by the double-dashed line). As a result, the locking body 51 can move to the locked position and the unlocked position.

[0075] Next, the advancing and retreating member 3 will be described in more detail.

[0076] like Figures 11 to 13 As shown, the end portion of the advance / retract member 3 on the retreat direction D2 side has a convex portion 3a that protrudes in the retreat direction D2 along the axis X, and a concave portion 3b that is concave relative to the convex portion 3a in the advance direction D1. The concave portion 3b is adjacent to the convex portion 3a in the direction around the axis X of the advance / retract member 3.

[0077] The convex portion 3a is a portion that protrudes in the backward direction D2 relative to the concave portion 3b in the axis X direction at the end portion on the backward direction D2 side of the advance / retract member 3. The number of the convex portions 3a is not particularly limited, but in this embodiment, Figures 11 to 13 As shown, a plurality of protrusions 3a are provided in the direction around the axis X (in this embodiment, two are provided symmetrically with respect to the axis X).

[0078] like Figures 11 to 13 As shown, the protrusion 3a has an abutment portion CT that can abut against the abutted portion 5a of the locking member 5 in the locked position when the advance / retract member 3 is in the retreat holding position. As will be described later, when the advance / retract member 3 is in the retreat holding position, if the advance / retract member 3 moves in the retreat direction D2, the abutment portion CT of the protrusion 3a abuts against the abutted portion 5a of the locking member 5, thereby preventing the advance / retract member 3 from reaching the retracted position and restricting movement of the advance / retract member 3 from the retreat holding position to the advance holding position.

[0079] In this embodiment, the contact portion CT is the end portion of the convex portion 3a on the side of the retreat direction D2. Figure 19 As shown, when the advance / retract member 3 is in the rearward holding position and attempts to move in the rearward direction D2, the contact portion CT contacts the contacted portion 5a of the locking member 5, which is in the locked position. Furthermore, the distance in the axis X direction between the contact portion CT and the contacted portion 5a of the advance / retract member 3 when the advance / retract member 3 is held in the rearward holding position is set to a distance that prevents the advance / retract member 3 from reaching the folded position. As described later, this prevents the advance / retract member 3 from reaching the folded position, restricting movement of the advance / retract member 3 from the rearward holding position to the forward holding position.

[0080] In addition, if Figures 17 to 19 As shown, when the advance / retract member 3 moves from the advance holding position to the retreat holding position via the folded position, the cam mechanism C guides the advance / retract member 3 in such a manner that the contact portion CT does not contact the contacted portion 5a of the lock member 5 even if the lock member 5 is in the locked position. As a result, as will be described later, when the lock member 5 is in the locked position, the advance / retract member 3 cannot move from the retreat holding position to the advance holding position, but can move from the advance holding position to the retreat holding position. In addition, Figures 17 to 19As shown, the convex portion 3a protrudes so as not to collide with the locking member 5 in the locked position when the advance / retract member 3 moves from the advance holding position via the folded position to the retreat holding position and when the advance / retract member 3 rotates about the axis X. The width of the convex portion 3a in the direction about the axis X is not particularly limited as long as it is configured to collide with the abutted portion 5a of the locking member 5 in the locked position when the advance / retract member 3 in the retreat holding position moves in the retreat direction D2.

[0081] like Figures 11 to 13 As shown, the concave portion 3b is a portion that is recessed in the direction of the advance direction D1 relative to the convex portion 3a in the direction of the axis X at the end portion on the side of the retreat direction D2 of the advance and retreat member 3. By the concave portion 3b, a concave space SP is formed in the area adjacent to the convex portion 3a in the direction around the axis X (see Figure 11 In this embodiment, the recess 3b is provided between the pair of protrusions 3a in the direction around the axis X, forming a concave space SP between the pair of protrusions 3a. In this embodiment, a plurality of recesses 3b are provided in the direction around the axis X (in this embodiment, two are provided symmetrically with respect to the axis X).

[0082] Although the details will be described later, the recessed portion 3b is configured such that when the locking member 5 is in the locked position and the advance / retract member 3 reaches the folded position from the advance holding position, the locking member 5 is disposed in the recessed space SP (see FIG. Figure 17 and Figure 18 In the present embodiment, the recessed portion 3b is formed with a width in the direction around the axis X and a depth in the direction around the axis X such that a portion including the abutted portion 5a of the locking member 5 can be accommodated in the concave space SP of the recessed portion 3b when the locking member 5 reaches the folded position from the forward holding position. Furthermore, in the present embodiment, the recessed portion 3b is formed with a width in the direction around the axis X and a depth in the direction around the axis X such that the locking member 5 does not abut against the protrusion 3a when the forward holding position is rotated in one direction D3 around the axis X toward the backward holding position.

[0083] like Figure 17 and Figure 18 As shown, in this embodiment, when the locking member 5 is in the locking position and the advance / retract member 3 reaches the folded position from the advance holding position, the contact portion CT of the advance / retract member 3 is located at a position not opposite to the contacted portion 5a in the axis X direction, and the locking member 5 is arranged in the concave space SP. However, when the advance / retract member 3 reaches the folded position from the advance holding position, as shown in FIG. Figure 17 and 18As shown, the contact portion CT of the convex portion 3a reaches a position closer to the rearward direction D2 than the contacted portion 5a in the X-axis direction. However, the contact portion CT is not opposite the contacted portion 5a in the X-axis direction, that is, it is offset in the direction around the X-axis. Therefore, when the advance / retract member 3 moves from the forward holding position to the retracted position, the contacted portion 5a of the locking member 5 in the locked position does not contact the contact portion CT of the advance / retract member 3. Furthermore, since the locking member 5 in the locked position enters the concave space SP, the contacted portion 5a does not contact the advance / retract member 3 in the position of the recessed portion 3b. Consequently, the movement of the advance / retract member 3 in the rearward direction D2 is not hindered, and the advance / retract member 3 can reach the retracted position. Therefore, the advance / retract member 3 can reach the retracted position and move to the rearward holding position. Thus, even when the locking member 5 is in the locked position, the advance / retract member 3 can be operated from the forward holding position to the rearward holding position.

[0084] In addition, if Figure 19 As shown, when the advance-retract member 3 rotates around the axis X from the folding position and is held in the retracted holding position, the abutment portion CT of the advance-retract member 3 is located at a position opposite to the abutted portion 5a of the locking member 5 in the locked position in the axis X direction. In addition, the interval G1 in the axis X direction between the abutment portion CT and the abutted portion 5a when the advance-retract member 3 is held in the retracted holding position is set to a distance at which the advance-retract member 3 cannot reach the folding position from the retracted holding position. In addition, the interval G1 is not particularly limited as long as it is a distance at which the advance-retract member 3 cannot reach the folding position from the retracted holding position. For example, it is preferred that the interval G1 in the axis X direction between the abutment portion CT and the abutted portion 5a when the advance-retract member 3 is held in the retracted holding position (refer to Figure 19 ) is smaller than the interval G2 in the X-axis direction between the first cam surface Ca and the first contact surface Cd1 when the advance / retract member 3 is in the retreat holding position (refer to Figure 19 In this case, it is possible to more reliably suppress the advancing and retreating member 3 from reaching the folded-back position.

[0085] As described above, when the advance / retract member 3 is held in the retracted holding position, the contact portion CT faces the contacted portion 5a, and the gap G1 between the contact portion CT and the contacted portion 5a is set to a distance that prevents the advance / retract member 3 from reaching the folded position. Figure 19 As shown, even if the advance and retreat member 3 moves in the retreat direction D2, the advance and retreat member 3 cannot reach the folded position. Therefore, the advance and retreat member 3 cannot move from the retreat holding position to the advance holding position, and the advance and retreat member 3 can be locked in the retreat holding position by the locking member 5.

[0086] In addition, regardless of the position of the axis X direction of the advancing and retreating member 3, the locking member 5 can be moved to the locked position. Figure 13As shown, when the advance and retreat member 3 is in the advance holding position, the advance and retreat member 3 is located on the advance direction D1 side, and a large space is formed on the retreat direction D2 side, so that the locking member 5 can be moved from the unlock position to the locked position. Figure 15 As shown, when the advance / retract member 3 is in the retracted holding position, a space is formed on the retracting direction D2 side of the contact portion CT of the convex portion 3a, which allows the locking member 5 to move to the locked position. This allows the locking member 5 to move to the locked position so that the contacted portion 5a of the locking member 5 faces the contact portion CT of the advance / retract member 3. Therefore, the locking member 5 can be moved to the locked position regardless of the position of the advance / retract member 3 in the axis X direction.

[0087] In addition, when the locking member 5 is moved to the locking position in the state where the advancing and retreating member 3 is in the advancing holding position, as shown in FIG. Figure 17 and Figure 18 As shown, when the advance / retract member 3 moves from the advance holding position to the folded position, the contact portion CT and the contacted portion 5a are not opposite to each other in the axis X direction. Figure 18 and Figure 19 As shown, as the advance / retract member 3 rotates about the axis X, the contact portion CT shifts to a position opposite the contacted portion 5a in the direction of the axis X during movement from the folded position to the rearward holding position. Therefore, even when the locking member 5 is moved to the locked position while in the forward holding position, the advance / retract member 3 can still be moved to the rearward holding position, and at the time of movement to the rearward holding position, the locking member 5 has completely locked the advance / retract member 3. Therefore, unlike conventional methods where the locking member cannot be locked while the advance / retract member is in the forward holding position, and locking is impossible unless the advance / retract member is moved to the rearward holding position, the advance / retract device 1 of this embodiment allows for easy locking of the advance / retract member 3.

[0088] Next, the operation of the forward and backward movement device 1 of this embodiment will be described by taking an example in which the forward and backward movement device 1 is applied to a cover opening and closing device D. The following description is merely an example, and the present invention is not limited thereto.

[0089] like Figure 15 、 Figure 19 As shown, the cover L (refer to Figure 3 ) is locked and the advance and retreat member 3 is in the retreat holding position. Figure 19 In the state shown, the movement of the advance and retreat member 3 to the advance holding position is restricted by the locking member 5, so the lid L is locked from being opened. In order to refuel, etc. from this state, when the lid L is opened, the locking state of the locking member 5 is first released. Specifically, an operating unit such as a remote key is used, such as Figure 15As shown, the locking member 5 is moved to the unlocked position (for example, an unlocking signal is sent to the driving portion 52, and the locking body 51 is moved to the unlocked position by the driving portion 52). When the locking member 5 is moved to the unlocked position, the cover L can be opened by pressing the cover L.

[0090] When the cover L is pressed, the advance and retreat member 3 is pressed in the retreat direction D2 by the cover L and moves in the retreat direction D2. Figure 16 As shown, while the first contact surface Cd1 of the guided portion Cd contacts the first cam surface Ca, the guided portion Cd moves in one direction D3 around the axis X, so that the advance / retract member 3 reaches the folded position. After the advance / retract member 3 reaches the folded position, when the pressing operation of the cover L is released, the advance / retract member 3 moves in the forward direction D1 due to the force of the biasing member 4 in the forward direction D1. When the advance / retract member 3 moves in the forward direction D1, as shown in FIG. Figure 16 As shown, while the second contact surface Cd2 of the guided portion Cd contacts the introduction portion Ce, the guided portion Cd moves in one direction D3 around the axis X, thereby entering the guide portion Cc. When the guided portion Cd enters the guide portion Cc, the force of the force applying member 4 causes the advance and retreat member 3 to move in the advance direction D1, thereby reaching the advance holding position (refer to FIG. Figure 13 ). When the advance and retreat member 3 reaches the forward holding position, as shown in FIG. Figure 3 As shown, the cover L is open, and fuel can be supplied from the fuel supply port. In addition, in this state, since the driver of the vehicle leaves the driver's seat, the vehicle door is sometimes locked to prevent the vehicle from being stolen during the fuel supply process. The door can be locked by sending a door lock signal using an operating unit such as a remote key. In this embodiment, the drive unit 52 is controlled to move the locking body 51 to the locked position according to the locking signal of the vehicle door. In this case, when the door is locked during the fuel supply process with the cover L open, the cover L becomes ready for locking based on the locking member 5 (refer to Figure 7 and Figure 17 ), the lid L can be locked at the time when the lid L is locked (refer to Figure 8 and Figure 19 ).

[0091] When the oil supply is completed with the lid L open, the oil supply port is closed and the lid L is locked. When the lid L is locked, the advance / retract member 3 is pressed in the backward direction D2 by the lid L and moves from the advance holding position to the backward direction D2. When the advance / retract member 3 moves from the advance holding position to the backward direction D2, as shown in FIG. Figure 17 As shown, the first contact surface Cd1 of the guided portion Cd contacts the first cam surface Ca, and the guided portion Cd moves in one direction D3 around the axis X, so that the advance and retreat member 3 reaches the folded position. Figure 17 When the lock position is as shown, the advance / retract member 3 has the recess 3b, so the locking member 5 enters the concave space SP of the recess 3b, and the contact portion CT of the convex portion 3a does not face the contacted portion 5a of the locking member 5, so the advance / retract member 3 can reach the folded position. Figure 18 As shown, after the advance and retreat member 3 reaches the folded position, when the pressing operation of the cover L is released, the advance and retreat member 3 moves in the forward direction D1 by the force of the urging member 4 in the forward direction D1. Figure 18 As shown by the two-dot chain line, the second contact surface Cd2 of the guided portion Cd contacts the second cam surface Cb, and the guided portion Cd moves in one direction D3 around the axis X, so that the guided portion Cd contacts the stop portion ST and stops (see Figure 19 ). As a result, the advancing and retreating member 3 is held in the retreat holding position.

[0092] like Figure 19 As shown, when the advance / retract member 3 is held in the retracted holding position, the contact portion CT of the protrusion 3a of the advance / retract member 3 faces the contacted portion 5a of the locking member 5. In this embodiment, the gap G1 between the contact portion CT and the contacted portion 5a is smaller than the gap G2 in the axis X direction between the first cam surface Ca and the first contact surface Cd1. Therefore, before the guided portion Cd passes the stop portion ST, the contact portion CT of the protrusion 3a contacts the contacted portion 5a of the locking member. As a result, the advance / retract member 3 cannot reach the folded-back position. Therefore, even if the lid L is pressed, the advance / retract member 3 cannot reach the folded-back position, thereby preventing the lid L from opening.

[0093] Description of labels

[0094] 1 forward and backward movement device

[0095] 2 Shell

[0096] 2a Bottom

[0097] 21 Advance and retreat member accommodation portion

[0098] 22 Locking member receiving portion

[0099] 23 protrusion

[0100] 24 Support shaft

[0101] 3 Advance and retreat components

[0102] 3a convex part

[0103] 3b concave part

[0104] 31. Carding Department

[0105] 32 Subject

[0106] 321 Force-applying member receiving portion

[0107] 4 Force-applying components

[0108] 5 Locking member

[0109] 5a Abutted portion

[0110] 51 Locking the subject

[0111] 511 driven parts

[0112] 512 Extension Section

[0113] 52 drive unit

[0114] 521 Electric Motor

[0115] 522 threaded shaft

[0116] B base (body)

[0117] Ba opening

[0118] C Cam mechanism

[0119] Ca first cam surface

[0120] Cb Second cam surface

[0121] Cc guide

[0122] Cd guided part

[0123] Cd1 first contact surface

[0124] Cd2 Second contact surface

[0125] Ce introduction section

[0126] CT contact part

[0127] D cover opening and closing device

[0128] D1 Direction of travel

[0129] D2 Backward direction

[0130] D3 A direction around the axis

[0131] G1 Axial distance between the contacting portion and the contacted portion

[0132] G2 Axial distance between the first cam surface and the first contact surface

[0133] H hinge

[0134] L cap (fuel cap)

[0135] La Locked portion on the operation object side

[0136] SP Concave Space

[0137] ST, ST2 stop part

[0138] X-axis

Claims

1. A forward and backward moving device, used for a fuel or power supply cover of a vehicle, comprising: case; an advancing and retreating member capable of moving relative to the housing in an advancing direction protruding from the housing and a retreating direction opposite to the advancing direction while rotating about an axis; a force applying member for applying force to the advancing and retreating member in the advancing direction; a cam mechanism configured to hold the advance / retract member at an advance holding position after moving in the advance direction and at a retreat holding position after moving in the retreat direction; and The locking member is movable between a locking position that restricts the movement of the advance / retract member toward the forward holding position and an unlocking position that allows the advance / retract member to move toward the forward holding position when the advance / retract member is located at the retreat holding position. The advancing and retreating member is configured to, when moving between the advancing holding position and the retreating holding position, pass through a folded position further to the retreating direction side with respect to the retreating holding position. The advancing and retreating member is provided with an abutting portion on the retreating direction side. The locking member is provided with an abutment portion on the advancing direction side. The advancing and retreating member has, at an end portion on the retreating direction side, a convex portion axially protruding in the retreating direction and a concave portion concave in the advancing direction relative to the convex portion. The abutting portion is provided on the convex portion, The recessed portion is adjacent to the convex portion in the axial direction of the advance / retract member, and a concave space is formed by the recessed portion in the region adjacent to the convex portion in the axial direction. When the locking member is in the locked position and the advance / retract member reaches the folded position from the advanced holding position, the abutting portion of the advance / retract member is located at a position that is not opposite to the abutted portion of the locking member in the axial direction, and the locking member is arranged in the concave space. When the advance / retract member rotates about the axis from the folded position and is held at the retracted holding position, the contact portion of the advance / retract member is located on the advancing direction side and opposite to the contacted portion of the lock member in the axial direction.

2. The forward and backward movement device according to claim 1, wherein: The cam mechanism is configured such that when the advance / retract member is moved from the advance holding position to the retreat holding position, after the advance / retract member reaches the folding position, the urging member moves the advance / retract member from the folding position to the retreat holding position and holds the member. The cam mechanism is configured such that when the advance / retract member is moved from the retracted holding position to the forward holding position, after the advance / retract member reaches the folded position from the retracted holding position, the urging member moves the advance / retract member from the folded position to the forward holding position and holds the position.

3. The forward and backward movement device according to claim 1 or 2, wherein: The cam mechanism has: a first cam surface disposed on the housing; a second cam surface disposed on the housing; and The guide portion is provided on the housing and extends along the axial direction of the advancing and retreating member. The guided portion is provided on the outer periphery of the advancing and retreating member, has a first contact surface in contact with the first cam surface and a second contact surface in contact with the second cam surface, and can be guided by the guiding portion. The first cam surface is inclined so as to contact the first contact surface of the guided portion when the advancing and retreating member moves in the retreat direction to the folded position, thereby rotating the advancing and retreating member in one direction around the axis. The second cam surface is inclined in the following manner: when the advance-retract member is maintained at the retreat holding position via the folding position from the advance holding position, and when the advance-retract member moves from the folding position toward the advance direction, it contacts the second contact surface of the guided portion, thereby causing the advance-retract member to rotate in the one direction in the axial direction.

4. A lid opening and closing device comprising: The forward and backward movement device according to any one of claims 1 to 3; a base portion, on which the forward and backward movement device is installed, and has an opening; and The cover can open and close the opening of the base and can be engaged with the end portion of the advancing and retreating member on the advancing direction side.

5. The cover opening and closing device according to claim 4, wherein: The locking member includes: a locking body capable of contacting the advancing and retreating member; and a driving portion for moving the locking body to the locked position and the unlocked position. The driving portion is controlled to move the lock body to the lock position according to a lock signal of the vehicle door.

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