Shaft member and lock device

Abstract

To change the length of a shaft member in a plurality of stages.SOLUTION: According to the shaft member 65, the shaft member 65 that transmits the rotational force from the input side member to the output side member includes the tubular main body portion 70 and the core 80 that is inserted into the main body portion 70 in the axial direction, the main body portion 70 includes the abutment portion (first abutment portion 71) that abuts on the one end portion 81 of the core 80, and the core 80 includes the step portion 83 that protrudes in the radial direction on the other end portion 82 side with respect to the one end portion 81. By rotating the core 80, a first state in which the one end portion 81 abuts on the abutting portion and a second state in which the step portion 83 abuts on the abutting portion can be selected.SELECTED DRAWING: Figure 7

Description

[Technical Field]

[0001] The present invention relates to a shaft member and a locking device. [Background technology]

[0002] Locking devices are equipped with shaft members that transmit rotational force from input members such as thumbturns, cylinders, handles, and motors to output members such as dead hubs. However, because the length of the shaft member varies depending on the specifications of the locking device, it is necessary to manufacture multiple types of shaft members with different lengths. On the other hand, standardizing components is effective in reducing costs. One possible method of standardizing shaft members is to add members of different lengths to short shaft members, but this has the problem of complicating installation work.

[0003] Therefore, technologies that allow the length of the shaft member to be changed have been studied. For example, Patent Document 1 discloses a cylinder lock in which a torque transmission member whose length can be adjusted according to the thickness of the door to be installed is provided between a thumbturn and a cylinder with a keyhole. The torque transmission member includes a first member with a key extending in the thickness direction of the door and a second member with a key groove for engaging with the key. Torque transmission between the thumbturn and the key is possible when the key engages with the key groove. The relative positions of the first and second members can be changed within a range that allows torque transmission. Patent Document 2 discloses a door lock in which square shafts are connected to the indoor and outdoor operating parts, respectively, and symmetrical convex and concave portions are formed at the tip of each square shaft, so that the convex and concave portions of each square shaft are opposed to each other and can be engaged within the square shaft hole of the latch case. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2006-336369 [Patent Document 2] Japanese Utility Model Application Publication No. 63-10172 Summary of the Invention [Problem to be solved by the invention]

[0005] However, the configuration disclosed in Patent Document 1 has problems such as a complex structure and a large number of parts. In the configuration disclosed in Patent Document 2, when two square shafts are spaced apart, stress may be concentrated at the tip of the square shaft that comes into contact with the square shaft hole.

[0006] In consideration of the above circumstances, an object of the present invention is to change the length of a shaft member in multiple stages. [Means for solving the problem]

[0007] In order to solve the above problem, the shaft member of the present invention is a shaft member that transmits rotational force from an input side member to an output side member, and comprises a cylindrical main body portion and a core that is inserted axially into the main body portion, the main body portion having an abutment portion that abuts against one end of the core, and the core having a step portion that protrudes radially toward the other end side beyond the one end portion, and by rotating the core, it is possible to select between a first state in which the one end abuts against the abutment portion and a second state in which the step portion abuts against the abutment portion.

[0008] Furthermore, the shaft member of the present invention is a shaft member that transmits rotational force from an input side member to an output side member, and comprises a cylindrical main body portion and a core that is inserted axially into the main body portion, the main body portion having a first abutment portion and a second abutment portion that abut against one end of the core, the first abutment portion and the second abutment portion having different circumferential positions, the first abutment portion being located at a shallower position in the axial direction than the second abutment portion, and by rotating the core, it is possible to select between a first state in which the one end abuts against the first abutment portion and a second state in which the one end abuts against the second abutment portion.

[0009] The shaft member may include a holding means for holding the core in the first state and the second state.

[0010] The holding means may be provided inside the main body portion and may bias the core in a direction to draw it into the main body portion.

[0011] In addition, the locking device of the present invention comprises the shaft member, the input side member, the output side member, and a lock body that is locked and unlocked by a rotational force transmitted from the input side member to the output side member. [Effects of the Invention]

[0012] According to the present invention, the length of the shaft member can be changed in multiple stages. [Brief explanation of the drawings]

[0013] [Figure 1] 1 is a perspective view showing the appearance of a locking device according to one embodiment of the present invention as seen from the interior side of the vehicle. FIG. [Figure 2] 1 is a perspective view showing the appearance of a locking device according to one embodiment of the present invention as seen from the outside of the room. FIG. [Figure 3] 1 is a cross-sectional view showing a thumb turn and a shaft member according to one embodiment of the present invention. FIG. [Figure 4] FIG. 2 is a view showing a main body according to an embodiment of the present invention. [Figure 5] FIG. 2 is a diagram showing a core according to an embodiment of the present invention. [Figure 6] FIG. 2 is a view showing a shaft member in a first state according to an embodiment of the present invention. [Figure 7] FIG. 10 is a view showing a shaft member in a second state according to one embodiment of the present invention. [Figure 8] 1 is a diagram showing a shaft member and an adapter in a first state according to an embodiment of the present invention. FIG. [Figure 9] 10 is a view showing the shaft member and the adapter in a second state according to one embodiment of the present invention. FIG. [Figure 10] FIG. 10 is a cross-sectional view showing a shaft member according to a modified example of an embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0014] Hereinafter, a lock device 1 according to one embodiment of the present invention will be described with reference to the drawings.

[0015] First, the overall configuration of the locking device 1 will be described. Fig. 1 is a perspective view showing the appearance of the locking device 1 as seen from inside the room. Fig. 2 is a perspective view showing the appearance of the locking device 1 as seen from outside the room. Fig. 3 is a cross-sectional view showing the thumb turn 32 and the shaft member 65. For convenience, the outside of the room will be referred to as the front side (front face side) and the inside of the room as the rear side (back face side), and the left and right directions will be based on the case where the locking device 1 is viewed from the front side. In each figure, U, Lo, L, R, Fr, and Rr represent up, down, left, right, front, and rear, respectively.

[0016] The locking device 1 (see Figures 1 and 2) comprises an indoor unit 3 provided on the indoor wall surface 2b of the door 2, an outdoor unit 4 provided on the outdoor wall surface 2c of the door 2, a lock case 5 provided inside the door 2, an indoor handle 5c provided below the indoor unit 3, and an outdoor handle 5d provided below the outdoor unit 4.

[0017] The lock case 5 is provided with a latch bolt 5a and a dead bolt 5b. The latch bolt 5a is biased in a direction that causes it to protrude from the end grain 2a, and protrudes from the end grain 2a when the indoor handle 5c and the outdoor handle 5d are not operated. The latch bolt 5a retracts from the end grain 2a by turning the indoor handle 5c counterclockwise or the outdoor handle 5d clockwise. The dead bolt 5b is provided above the latch bolt 5a. The dead bolt 5b extends and retracts from the end grain 2a by operating the indoor unit 3 or the outdoor unit 4, which will be described later.

[0018] [Indoor unit] The indoor unit 3 (see FIGS. 1 and 3) includes a cover 31, a thumbturn 32, a drive unit 33, and a bracket 61. The cover 31 is formed in the shape of a vertically long box with an open front. The thumbturn 32 is provided at the bottom of the rear surface of the cover 31. The drive unit 33 includes a housing 33a formed in the shape of a vertically long box. The thumbturn shaft 32a is disposed along the front-to-rear direction and is rotatably supported by the housing 33a. A motor and a gear train (not shown) that drive the thumbturn shaft 32a are provided inside the housing 33a.

[0019] A bracket 61 (see Figure 3) is provided on the indoor side wall surface 2b of the door 2. The drive unit 33 and the cover 31 are attached to the indoor side wall surface 2b via the bracket 61. The bracket 61 (see Figure 6) is formed in the shape of a vertically long plate. The bracket 61 has a through hole 61H that penetrates in the front-to-rear direction. A shaft member 65, which will be described later, is disposed in the through hole 61H. The drive unit 33 and the bracket 61 are fastened together to the door 2 using screws (not shown). When the cover 31 is attached to the bracket 61, the drive unit 33 is housed inside the cover 31, and the thumb turn 32 is connected to the rear end of the thumb turn shaft 32a.

[0020] Inside the door 2, the deadbolt 5b is connected to the thumbturn shaft 32a and the cylinder lock 44 (not shown). By rotating the thumbturn 32, the deadbolt 5b protrudes and retracts from the end piece 2a. In addition, by rotating the cylinder lock 44, the deadbolt 5b protrudes and retracts from the end piece 2a.

[0021] [Outdoor equipment] The outdoor unit 4 (see FIG. 2) includes an upper cover 41, a lower cover 42, a communication device 43, and a cylinder lock 44. The upper cover 41 is formed in the shape of a vertically long box with an open rear. A push button 45 is provided at the bottom of the front of the upper cover 41. The communication device 43 is provided inside the upper cover 41. The lower cover 42 is formed in the shape of a box with an open rear and is detachable. The cylinder lock 44 is provided inside the lower cover 42.

[0022] The communication device 43 includes a reader board (not shown) that reads information from a contactless IC card (not shown) and an antenna board (not shown) that performs wireless communication with the portable key (not shown). A control circuit (not shown) is built into the reader board. The control circuit has a function, for example, to determine whether the authentication information read from the IC card or portable key is correct.

[0023] The cylinder lock 44 (see Figure 3) comprises a cylindrical cylinder body 44a and a collar 44b that covers the outer surface of the cylinder body 44a. The collar 44b is tapered so that its diameter decreases from the rear end to the front end. The rear end of the collar 44b contacts the exterior wall surface 2c of the door 2. The shaft (not shown) of the cylinder lock 44 is connected to a dead hub (not shown) provided on the lock case 5. The dead hub converts the rotational force of the shaft of the cylinder lock 44 into a force in the direction of extending and retracting the dead bolt 5b.

[0024] The communication device 43 and the drive device 33 operate using power supplied from a battery (not shown) housed in the indoor unit 3. If the battery runs out and the communication device 43 or the drive device 33 no longer operates, it is possible to open the lower cover 42 and use an emergency key (not shown) to lock and unlock the cylinder lock 44.

[0025] A person attempting to enter the room from outside presses the push button 45 and then holds up their IC card. This initiates communication between the IC card and the reader board, and the authentication information on the IC card is read by the reader board. The control circuit on the reader board determines whether the read authentication information matches pre-stored authentication information. If it is determined that the information matches, the control circuit outputs an unlock signal to the drive device 33, and the cylinder lock 44 is unlocked. On the other hand, if it is determined that the authentication information does not match, no unlock signal is output, and the cylinder lock 44 is not unlocked.

[0026] As another unlocking method, if a person trying to enter from outside the room has a portable key, pressing the push button 45 is sent to the control circuit of the reader board, and the results of the wireless communication between the portable key and the antenna board are sent to the control circuit of the reader board. The control circuit determines whether the authentication information obtained from the portable key matches the authentication information stored in advance, and if it is determined to match, the cylinder lock 44 is unlocked in the same manner as above.

[0027] [Shaft member] The shaft member 65 (see FIG. 3) is disposed with its axial direction aligned in the front-to-rear direction. The rear end of the shaft member 65 is connected to the thumbturn shaft 32a, and the front end of the shaft member 65 is connected to a dead hub (not shown) provided on the lock case 5. The shaft member 65 is supported by an adapter 63 and is rotatable together with the thumbturn shaft 32a. A liner 62 is provided between the adapter 63 and the bracket 61. The distance between the adapter 63 and the bracket 61 can be adjusted by changing the number or thickness of the liner 62. The adapter 63 is fixed to the lock case 5 using a pin or screw (not shown). The adapter 63 may be fastened to the bracket 61 together with the liner 62. The shaft member 65 transmits rotational force from the thumbturn shaft 32a to a dead hub (not shown) of the lock case 5. The dead hub (not shown) of the lock case 5 converts the rotational force transmitted from the thumbturn shaft 32a into a force in a direction that extends and retracts the deadbolt 5b. The shaft member 65 includes a cylindrical main body 70 and a core 80 that is inserted into the main body 70 in the axial direction.

[0028] [Main body] 4 is a diagram showing the main body 70. Of these, (A) is a perspective view, (B) is a side view, (C) is a cross-sectional view showing cross section II of (B), (D) is a rear view, and (E) is a front view.

[0029] The main body 70 has a cylindrical tubular portion 70C with its axial direction aligned in the front-to-rear direction. A pair of parallel D-shaped cutouts 70D are formed on the outer surface of the tubular portion 70C. The thumbturn shaft 32a is formed with a shaft hole 32b shaped to fit the tubular portion 70C. This configuration restricts relative rotation between the main body 70 and the thumbturn shaft 32a, allowing the main body 70 to rotate in unison with the thumbturn shaft 32a. The outer surface of the tubular portion 70C and the shaft hole 32b of the thumbturn shaft 32a may have any shape as long as the relative rotation between them is restricted. For example, the D-shaped cutout 70D may be formed in a single location, and the outer surface of the main body 70 may be prismatic.

[0030] A flange portion 70F protruding in the radial direction is provided at the front end of the cylindrical portion 70C. A groove portion 70G is formed along the circumferential direction slightly rearward of the flange portion 70F. A small diameter portion 73 and a large diameter portion 74 having an inner diameter larger than that of the small diameter portion 73 are provided inside the cylindrical portion 70C. The small diameter portion 73 is provided over a predetermined length from the rear end of the main body 70, and the large diameter portion 74 is provided forward of the small diameter portion 73.

[0031] A second contact portion 72, which is a surface perpendicular to the front-to-rear direction, is provided at the boundary between the small diameter portion 73 and the large diameter portion 74. A first contact portion 71, which is a surface perpendicular to the front-to-rear direction, is provided in front of the second contact portion 72 on the large diameter portion 74. In other words, the first contact portion 71 is provided at a position shallower from the front end of the main body portion 70 than the second contact portion 72. The first contact portion 71 protrudes inward from the inner surface of the large diameter portion 74 in the 12 o'clock direction and the 6 o'clock direction in FIG. 4(E).

[0032] The large diameter portion 74 has grooves 75 formed in a plurality of circumferential positions along the front-rear direction. In this embodiment, as an example, the grooves 75 are formed at four circumferential positions of the large diameter portion 74 at 90° intervals. Of the four grooves 75, the grooves 75 at the 3 o'clock and 9 o'clock positions in FIG. 4(E) are formed throughout the large diameter portion 74; in other words, they extend from the front end of the main body portion 70 to the second contact portion 72. On the other hand, the grooves 75 at the 0 o'clock and 6 o'clock positions in FIG. 4(E) extend from the front end of the main body portion 70 to the first contact portion 71. In other words, the grooves 75 at the 0 o'clock and 6 o'clock positions are shallower from the front end of the main body portion 70 than the grooves 75 at the 3 o'clock and 9 o'clock positions.

[0033] [core] 5 is a diagram showing the core 80. Of these, (A) is a perspective view, (B) is a side view, (C) is a plan view, (D) is a rear view, and (E) is a front view.

[0034] The core 80 has a cylindrical columnar portion 80C whose axial direction is the front-rear direction. The columnar portion 80C has an outer diameter corresponding to the inner diameter of the large-diameter portion 74 of the main body 70. Specifically, the columnar portion 80C may be fitted into the large-diameter portion 74, or a gap may be formed between the columnar portion 80C and the large-diameter portion 74. A pair of radially protruding steps 83 are provided on the core 80 closer to the other end 82 (front end) than one end 81 (rear end). The pair of steps 83 have surfaces perpendicular to the front-rear direction. The portion of the columnar portion 80C rearward of the pair of steps 83 is formed in a plate shape parallel to the axial direction. This portion will be referred to as the plate-like portion 84. The plate-like portion 84 has a hole 84H that engages with a tension spring 86, which will be described later.

[0035] The columnar portion 80C is provided with protrusions 80P extending in the front-rear direction at multiple locations in the circumferential direction. In this embodiment, as an example, the columnar portion 80C has four protrusions 80P provided at 90° intervals in the circumferential direction. Of the four protrusions 80P, the protrusions 80P at the 3 o'clock and 9 o'clock positions in FIGS. 5(D) and 5(E) are provided at positions corresponding to both widthwise ends of the plate-shaped portion 84. The protrusions 80P at the 3 o'clock and 9 o'clock positions reach the rear end of the plate-shaped portion 84. In other words, both widthwise ends of the plate-shaped portion 84 form the same plane as the protrusions 80P at the 3 o'clock and 9 o'clock positions. On the other hand, the protrusions 80P at the 0 o'clock and 6 o'clock positions reach the step portion 83.

[0036] Fig. 6 is a diagram showing the shaft member 65 in a first state. Of these, (A) is a side view, and (B) is a cross-sectional view showing the II-II cross section of (A). Fig. 7 is a diagram showing the shaft member 65 in a second state. Of these, (A) is a side view, and (B) is a cross-sectional view showing the III-III cross section of (A). The first state is a state in which the shaft member 65 is longer than in the second state, and the second state is a state in which the shaft member 65 is shorter than in the first state.

[0037] The lid portion 85 closes the rear end of the small diameter portion 73. The lid portion 85 is provided with a hole 85H for engaging a tension spring 86. Before the core 80 is inserted into the main body portion 70, the tension spring 86 is connected to the core 80 and the lid portion 85. The lid portion 85 also has the function of restricting the inflow of outside air via the shaft member 65.

[0038] First, a case will be described in which the distance between one end 81 and the step portion 83 of the core 80 is equal to the distance between the first contact portion 71 and the second contact portion 72. When the shaft member 65 is set to the first state, the one end 81 of the core 80 is brought into contact with the first contact portion 71. In this case, the step portion 83 of the core 80 does not come into contact with the main body portion 70, and the second contact portion 72 of the main body portion 70 does not come into contact with the core 80. On the other hand, when the shaft member 65 is set to the second state, the core 80 is rotated 90° with respect to the first state and inserted into the main body portion 70, so that the one end 81 of the core 80 comes into contact with the second contact portion 72 and the step portion 83 of the core 80 comes into contact with the first contact portion 71. In other words, the first state and the second state can be selected by rotating the core 80. In both the first state and the second state, the tension spring 86 biases the core 80 in a direction that pulls the core 80 into the main body 70, thereby fixing the core 80 to the main body 70. The tension spring 86 is an example of a holding means that holds the core 80 in the first state and the second state.

[0039] In addition, if the distance between one end 81 of the core 80 and the step portion 83 and the distance between the first abutment portion 71 and the second abutment portion 72 are not equal, in the second state, either one of the one end 81 of the core 80 abuts against the second abutment portion 72 or the step portion 83 of the core 80 abuts against the first abutment portion 71 occurs.

[0040] For example, if the distance between one end 81 of the core 80 and the step portion 83 is longer than the distance between the first contact portion 71 and the second contact portion 72, in the second state, the one end 81 of the core 80 abuts against the second abutment portion 72, but the step portion 83 of the core 80 does not abut against the first abutment portion 71. In other words, by rotating the core 80, it is possible to select between a first state in which the one end 81 abuts against the first abutment portion 71 and a second state in which the one end 81 abuts against the second abutment portion 72. In other words, in this configuration, the step portion 83 is not essential.

[0041] On the other hand, when the distance between one end 81 of the core 80 and the step portion 83 is shorter than the distance between the first contact portion 71 and the second contact portion 72, in the second state, the step portion 83 of the core 80 abuts against the first contact portion 71, but the one end 81 of the core 80 does not abut against the second abutment portion 72. In other words, by rotating the core 80, it is possible to select between a first state in which the one end 81 abuts against the first abutment portion 71, and a second state in which the step portion 83 abuts against the first abutment portion 71. In other words, in this configuration, the second abutment portion 72 is not essential.

[0042] Fig. 8 shows the shaft member 65 and the adapter 63 in a first state. Of these, (A) is a side view, and (B) is a cross-sectional view showing the IV-IV cross section of (A). Fig. 9 shows the shaft member 65 and the adapter 63 in a second state. Of these, (A) is a side view, and (B) is a cross-sectional view showing the VV cross section of (A).

[0043] The adapter 63 is a plate-shaped member that supports the shaft member 65. The adapter 63 has a through hole 63H into which the main body 70 is inserted. The diameter of the through hole 63H is larger than the outer diameter of the cylindrical portion 70C of the main body 70. A small-diameter portion 63S, whose inner diameter is smaller than that of the through hole 63H, is provided on the inner surface of the through hole 63H. The cylindrical portion 70C of the main body 70 is fitted into the small-diameter portion 63S. The small-diameter portion 63S is disposed between the flange portion 70F and the groove portion 70G of the main body 70, and a C-shaped or E-shaped retaining ring 64 is attached to the groove portion 70G, thereby fixing the adapter 63 to the shaft member 65. The adapter 63 may be fixed to the lock case 5 using a pin or screw, or may be fastened together with the liner 62 to the bracket 61.

[0044] The shaft member 65 according to the present embodiment described above transmits rotational force from the input-side member (thumb turn 32) to the output-side member (dead hub provided in the lock case 5). The shaft member 65 includes a cylindrical main body 70 and a core 80 axially inserted into the main body 70. The main body 70 includes a contact portion (first contact portion 71) that contacts one end 81 of the core 80. The core 80 includes a step portion 83 that protrudes radially from the one end 81 toward the other end 82. By rotating the core 80, it is possible to select between a first state in which the one end 81 contacts the contact portion and a second state in which the step portion 83 contacts the contact portion. With this configuration, selecting either the first state or the second state changes the depth to which the core 80 is inserted into the main body 70. Therefore, the length of the shaft member 65 can be adjusted in multiple stages.

[0045] Furthermore, the shaft member 65 according to this embodiment transmits a rotational force from an input-side member (thumb turn 32) to an output-side member (a dead hub provided in the lock case 5). The shaft member 65 includes a cylindrical main body 70 and a core 80 axially inserted into the main body 70. The main body 70 includes a first contact portion 71 and a second contact portion 72 that contact one end 81 of the core 80. The first contact portion 71 and the second contact portion 72 are located at different circumferential positions, and the first contact portion 71 is located axially shallower than the second contact portion 72. By rotating the core 80, it is possible to select between a first state in which the one end 81 contacts the first contact portion 71 and a second state in which the one end 81 contacts the second contact portion 72. With this configuration, the depth to which the core 80 is inserted into the main body 70 is changed by selecting either the first state or the second state. Therefore, the length of the shaft member 65 can be changed in multiple stages.

[0046] Furthermore, the shaft member 65 according to this embodiment includes a holding means (tension spring 86) that holds the core 80 in the first state and the second state. With this configuration, the core 80 can be fixed to the main body portion 70.

[0047] Furthermore, according to the shaft member 65 of this embodiment, the holding means is provided inside the main body 70 and biases the core 80 in a direction that draws the core 80 into the main body 70. With this configuration, the task of fixing the core 80 is not required, and the core 80 can be easily fixed to the main body 70.

[0048] Furthermore, the lock device 1 according to this embodiment comprises an axle member 65, an input member (thumb turn 32), an output member (a dead hub provided in the lock case 5), and a lock body (cylinder lock 44) that is locked and unlocked by the rotational force transmitted from the input member to the output member. With this configuration, the length of the axle member 65 can be changed in multiple stages depending on the structure of the lock device 1.

[0049] The above embodiment may be modified as follows.

[0050] FIG. 10 is a cross-sectional view showing a shaft member 65 according to a modified example. (A) is a cross-sectional view showing the II-II cross section of FIG. 6A (first state), and (B) is a cross-sectional view showing the III-III cross section of FIG. 7A (second state). In this modification, a screw 87 is used as a retaining means instead of the tension spring 86 of the above embodiment. A female thread 88 is formed in the core 80 in the axial direction. The screw 87 is inserted from the small-diameter portion 73 of the main body 70 and fastened to the female thread 88. The screw 87 has a length that allows it to be fastened to the female thread 88 in both the first state and the second state. The head 87H of the screw 87 has a larger diameter than the small-diameter portion 73. The screw 87 also functions to restrict the inflow of outside air through the shaft member 65. This configuration also allows the core 80 to be fixed to the main body 70.

[0051] In the above embodiment, an example has been shown in which the input side member is the thumb turn 32, but the input side member may also be a cylinder lock, a handle, a knob, a motor shaft, or the like.

[0052] In the above embodiment, an example was shown in which the holding means was the tension spring 86, but the holding means may also be the north and south poles of a permanent magnet, or the like. [Explanation of symbols]

[0053] 1 locking device 5 Lock case (output side component) 32 Thumb turn (input side member) 44 Cylinder lock (lock body) 65 Shaft member 70 Main body 71 1st contact part (contact part) 72 Second contact part 80 cores 81 One end 82 Other end 83 Multilayered section 86 Tension spring (retaining means) 87 Screw (retaining means)

Claims

1. A shaft member that transmits a rotational force from an input side member to an output side member, A cylindrical main body portion; a core that is axially inserted into the main body portion, the main body portion includes an abutment portion that abuts against one end of the core, the core has a step portion that protrudes radially from the one end toward the other end, A shaft member characterized in that, by rotating the core, it is possible to select between a first state in which the one end abuts the abutment portion and a second state in which the step portion abuts the abutment portion.

2. A shaft member that transmits a rotational force from an input side member to an output side member, A cylindrical main body portion; a core that is axially inserted into the main body portion, the main body portion includes a first contact portion and a second contact portion that contact one end of the core, The first contact portion and the second contact portion are located at different positions in the circumferential direction, the first contact portion is provided at a position shallower in the axial direction than the second contact portion, A shaft member characterized in that, by rotating the core, it is possible to select between a first state in which the one end abuts the first abutment portion and a second state in which the one end abuts the second abutment portion.

3. 3. The shaft member according to claim 1, further comprising a holding means for holding the core in the first state and the second state.

4. 4. The shaft member according to claim 3, wherein the holding means is provided inside the main body portion and biases the core in a direction to draw it into the main body portion.

5. The shaft member according to claim 1 or 2; the input side member; the output side member; A lock device characterized by comprising: a lock body that is locked and unlocked by rotational force transmitted from the input side member to the output side member.

Images