JP2019057379A - Lock device - Google Patents

Abstract

To provide a lock device capable of locking a lever of one circuit breaker out of three or more circuit breakers to an OFF position, even when the three or more circuit breakers are parallely arranged.SOLUTION: A lock device comprises: a base; a slid member slidably attached to the base. The slid member includes at least three projection parts for preventing switching of a lever from an OFF position to an ON position, and at least one of the at least three projection parts are constructed in a two-pronged structure.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a locking device.

There has been known a mechanical interlock device that locks the lever of one of two circuit breakers juxtaposed side by side to the OFF position (see, for example, Patent Document 1).
[Prior art documents]
[Patent Literature]
[Patent Document 1] Japanese Patent Application Laid-Open No. 2007-234495

  Even when three or more circuit breakers are juxtaposed, it is desirable to be able to provide a lock device that can lock the levers other than one of them in the OFF position.

  According to a first aspect of the present invention, a locking device is provided. The locking device may include a base. The lock device may include a slide member slidably attached to the base. The slide member may have at least three protrusions for preventing the lever from being switched from the OFF position to the ON position. At least one of the at least three protrusions may be bifurcated.

  The at least three protrusions may include a first protrusion, a second protrusion, and a bifurcated third protrusion, and the locking device includes a first member by sliding the slide member. Of the lever, the second lever, and the third lever, only the first lever can be switched between the ON position and the OFF position. The second protrusion and the third protrusion allow the second lever and the third lever to be switched. A first state that prevents the third lever from being switched from the OFF position to the ON position, and, of the first lever, the second lever, and the third lever, only the second lever has an ON position and an OFF position. A second state in which the first lever and the third protrusion prevent the first lever and the third lever from being switched from the OFF position to the ON position, and the first lever, The second -Of the third lever, only the third lever can be switched between the ON position and the OFF position, and the first lever and the second lever can be switched by the first protrusion and the second protrusion. The third state in which the switching from the OFF position to the ON position is prevented may be switched.

  The bifurcated distance between the third protrusions may be wider than the width of the third lever. The width of the first protrusion may be twice the width of the first lever, and the first protrusion contacts the full width of the first lever in the second state and the third state. Thus, the switching of the first lever from the OFF position to the ON position may be prevented. The width of the first protrusion may be the same as the width of the first lever. In the second state and the third state, the first protrusion corresponds to a part of the entire width of the first lever. The contact may prevent the first lever from being switched from the OFF position to the ON position. The width of the first protrusion may be narrower than the width of the first lever. In the second state and the third state, the first protrusion is in contact with a part of the entire width of the first lever. Accordingly, the switching of the first lever from the OFF position to the ON position may be prevented.

  The first lever, the second lever, and the third lever may be levers that switch ON / OFF of different system power breakers. The slide member may include a knob protruding from an opening formed in the base, and the base includes a first recess, a second recess, and a third recess extending from the opening. Preferably, the locking device is in the first state when the knob is inserted into the first recess, and is in the second state when the knob is inserted into the second recess. It may be in the third state by being inserted into the third recess. The slide member may be configured to be able to change the interval between the at least three protrusions. The interval between the at least three protrusions may change as the slide member expands and contracts. The slide member may be configured such that the at least three protrusions are separated and can be coupled to different positions of the slide member. The at least three projecting portions may be configured such that the length along the direction projecting from the slide member can be changed. The at least three protrusions may change in length by extending and contracting in a direction protruding from the slide member. The slide member may be configured such that the at least three protrusions are separated and a protrusion having a length different from that of the at least three protrusions can be coupled.

  The at least three protrusions may include a first protrusion, a second protrusion, and a bifurcated third protrusion, and the base includes the first protrusion and the second protrusion. A first base that supports the slide member between the second projecting portion and a second base that supports the slide member between the second projecting portion and the third projecting portion.

  It should be noted that the above summary of the invention does not enumerate all the necessary features of the present invention. In addition, a sub-combination of these feature groups can also be an invention.

An example of locking device 10 is shown roughly. An example of locking device 10 is shown roughly. An example of locking device 10 is shown roughly. Another example of the locking device 10 is shown schematically. Another example of the locking device 10 is shown schematically. Another example of the locking device 10 is shown schematically. Another example of the slide member 100 is shown schematically. Another example of the slide member 100 is shown schematically. Another example of the slide member 100 is shown schematically. Another example of the slide member 100 is shown schematically. Another example of the protrusion part 120 is shown schematically. Another example of the protrusion part 120 is shown schematically. Another example of the locking device 10 is shown schematically. Another example of the locking device 10 is shown schematically. Another example of the locking device 10 is shown schematically. Another example of the locking device 10 is shown schematically.

  Hereinafter, the present invention will be described through embodiments of the invention, but the following embodiments do not limit the invention according to the claims. In addition, not all the combinations of features described in the embodiments are essential for the solving means of the invention.

  1, 2, and 3 schematically show an example of the locking device 10. The locking device 10 according to the present embodiment prevents switching from the OFF position to the ON position for levers other than one of the three or more levers. For example, the lock device 10 enables only one of the three levers to be switched from the ON position to the OFF position, and prevents the remaining two levers from being switched from the OFF position to the ON position. FIGS. 1 to 3 illustrate a case where the locking device 10 selectively prevents the lever 310, the lever 320, and the lever 330 from being switched between the ON position and the OFF position.

  The three or more levers targeted by the locking device 10 may be of any use. For example, the three or more levers are for switching ON / OFF of power supply breakers of different systems. By preventing the lock device 10 from switching from the OFF position to the ON position for the levers other than one of the three or more levers, it is possible to prevent a plurality of power breakers from being turned on simultaneously.

  For example, if one of the three levers corresponds to the main power supply and the remaining two correspond to the standby power supply, the auxiliary power supply, etc., if two or more levers are switched to the ON position at the same time, the power supply is excessive. May cause problems. According to the locking device 10 according to the present embodiment, occurrence of such a situation can be prevented. That is, for example, by preventing the main power source and the standby power source or the auxiliary power source from being turned on simultaneously, it is possible to prevent the occurrence of a problem. In addition, as a power supply which three or more levers correspond, an electric power network, various generators, a mobile power vehicle, etc. can be illustrated.

  The locking device 10 includes a slide member 100, a base 202, and a base 204. The slide member 100 is slidably attached to the base 202 and the base 204.

  The base 202 and the base 204 are fixedly installed with respect to the lever 310, the lever 320, and the lever 330. For example, when the lever 310, the lever 320, and the lever 330 are for switching ON / OFF of the power breaker, the base 202 and the base 204 are fixed to the power breaker. The base 202 and the base 204 may be fixed by any method, for example, screwing and bonding are used.

  The slide member 100 may have at least three protrusions for preventing the lever from being switched from the OFF position to the ON position, and at least one of the at least three protrusions may be bifurcated. . In the example illustrated in FIG. 1, the slide member 100 includes a projecting portion 110, a projecting portion 120, and a projecting portion 130 configured to be bifurcated. In FIG. 1, the case where the bifurcated projecting portion 130 is disposed between the projecting portion 110 and the projecting portion 120 is illustrated, but the present invention is not limited thereto, and the projecting portion 130 is disposed at the end. Also good.

  The slide member 100 may have a knob 102 protruding from an opening 203 formed in the base 202 and a knob 104 protruding from an opening 205 formed in the base 204. The slide member 100 is slid with respect to the base 202 and the base 204 by operating at least one of the knob 102 and the knob 104.

  The locking device 10 can switch between the ON position and the OFF position of only the lever 310 among the lever 310, the lever 320, and the lever 330 by sliding the slide member 100. The first state that prevents the lever 320 and the lever 330 from switching from the OFF position to the ON position can be switched between the ON position and the OFF position of only the lever 320 among the lever 310, the lever 320, and the lever 330. And the second state in which the lever 310 and the lever 330 are prevented from being switched from the OFF position to the ON position by the protrusion 110 and the protrusion 130, and only the lever 330 of the lever 310, the lever 320, and the lever 330 is in the ON position. It is possible to switch between the OFF position and the protrusion 110 and the protrusion 120 A third state for preventing the switch to the ON position from the OFF position of the lever 310 and the lever 320 I is switched. 1 illustrates the first state, FIG. 2 illustrates the second state, and FIG. 3 illustrates the third state.

  The protrusion 110 may be an example of a first protrusion, the protrusion 120 may be an example of a second protrusion, and the protrusion 130 may be an example of a third protrusion. The lever 310 may be an example of a first lever, the lever 320 may be an example of a second lever, and the lever 330 may be an example of a third lever.

  In the example shown in FIGS. 1 to 3, the width of the protrusion 110 is twice or more the width of the lever 310. The width of the protrusion 110 may be twice the width of the lever 310, for example. Further, the width of the protrusion 120 is twice or more the width of the lever 320. The width of the protrusion 120 may be twice the width of the lever 320, for example.

  Further, in the example shown in FIGS. 1 to 3, the distance between the protrusions 130 is wider than the width of the lever 330, and the width of each of the forks is equal to or larger than the width of the lever 330. The width of each of the two forks may be the same as the width of the lever 330.

  In the second state and the third state, the protrusion 110 prevents the lever 310 from switching from the OFF position to the ON position by contacting the full width of the lever 310. In the first state and the second state, the protrusion 120 prevents the lever 320 from switching from the OFF position to the ON position by contacting the full width of the lever 320. In the first state and the third state, the protrusion 130 prevents the lever 330 from switching from the OFF position to the ON position by contacting the full width of the lever 330.

  In FIGS. 1 to 3, the example in which the locking device 10 includes two bases 202 and 204 has been described, but the present invention is not limited thereto. The locking device 10 may include only one of the base 202 and the base 204.

  A magnet conductor and a sequence circuit can also be used as means for achieving the object of preventing two or more power source breakers of three different systems from becoming effective at the same time. However, according to the locking device 10 according to the present embodiment, the object can be easily achieved by a mechanical configuration without using them, which can contribute to cost reduction.

  4, 5, and 6 schematically show another example of the locking device 10. The locking device 10 shown in FIGS. 4 to 6 and the locking device 10 shown in FIGS. 1 to 3 are different in the width of the protruding portion 110, the width of the protruding portion 120, and the width of the two portions of the protruding portion 130. Here, differences from the locking device 10 shown in FIGS. 1 to 3 will be mainly described.

  The width of the protrusion 110 may be equal to or less than the width of the lever 310. The width of the protrusion 120 may be equal to or less than the width of the lever 320. The width of each of the forked portions of the protrusion 130 may be equal to or less than the width of the lever 330. 4 to 6, the width of the protrusion 110 is half of the width of the lever 310, the width of the protrusion 120 is half of the width of the lever 320, and the width of each of the two portions of the protrusion 130 is the lever 330. The case where it is half the width of is illustrated.

  In the second state and the third state, the protrusion 110 prevents the lever 310 from switching from the OFF position to the ON position by contacting a part of the full width of the lever 310. In the first state and the second state, the protrusion 120 prevents the lever 320 from being switched from the OFF position to the ON position by contacting a part of the entire width of the lever 320. In the first state and the third state, the protrusion 130 prevents the lever 330 from being switched from the OFF position to the ON position by contacting a part of the entire width of the lever 330.

  4 to 6, the width of the protrusion 110 is half of the width of the lever 310, the width of the protrusion 120 is half of the width of the lever 320, and the width of each of the two portions of the protrusion 130 is the lever 330. However, the present invention is not limited to this. In the first state, the lever 320 and the lever 330 can be prevented from switching from the OFF position to the ON position, in the second state, the lever 310 and the lever 330 can be prevented from switching from the OFF position to the ON position, and in the third state, the lever As long as the switching of the 310 and the lever 320 from the OFF position to the ON position can be prevented, the width of the protrusion 110 may be an arbitrary width less than the width of the lever 310, and the width of the protrusion 120 is an arbitrary width less than the width of the lever 320. The width of each of the projecting portions 130 may be an arbitrary width equal to or less than the width of the lever 330.

  7 and 8 schematically show another example of the slide member 100. FIG. The slide member 100 shown in FIGS. 7 and 8 is configured to be able to change the interval between the protrusion 110, the protrusion 120, and the protrusion 130.

  The slide member 100 includes a slide portion 151 having a protruding portion 110, a slide portion 152 having a protruding portion 120, and a slide portion 153 having a protruding portion 130. Each of the slide part 151, the slide part 152, and the slide part 153 includes a plurality of holes 155.

  The slide part 151 and the slide part 153 may be fixed using two holes 155 of the plurality of holes 155. For example, the slide part 151 and the slide part 153 are fixed by being screwed by the two holes 155. Arbitrary methods other than screwing may be used as a method for fixing the slide portion 151 and the slide portion 153. By changing the relative positions of the slide part 151 and the slide part 153, the slide member 100 expands and contracts, whereby the distance between the protrusion part 110 and the protrusion part 130 changes.

  The slide part 152 and the slide part 153 may be fixed using two holes 155 of the plurality of holes 155. For example, the slide part 152 and the slide part 153 are fixed by being screwed by the two holes 155. Arbitrary methods other than screwing may be used as a method for fixing the slide portion 152 and the slide portion 153. By changing the relative position of the slide part 152 and the slide part 153, the slide member 100 expands and contracts, whereby the distance between the protrusion part 120 and the protrusion part 130 changes.

  As shown in FIGS. 7 and 8, the slide member 100 is configured to be able to change the intervals of the protrusion 110, the protrusion 120, and the protrusion 130, so that the lever 310, the lever 320, and The locking device 10 can be easily applied to the lever 330.

  7 and 8, the sliding portion 151 and the sliding portion 153, and the sliding portion 152 and the sliding portion 153 are relatively moved and fixed by the plurality of holes 155, so that the protruding portion 110, the protruding portion 120, In addition, the example in which the interval between the protrusions 130 can be changed has been described, but the present invention is not limited thereto. The slide part 151, the slide part 152, and the slide part 153 do not include a plurality of holes 155, and include other configurations such as a rail structure, whereby the interval between the protrusion 110, the protrusion 120, and the protrusion 130 can be changed. You may comprise.

  FIG. 9 schematically shows another example of the slide member 100. The slide member 100 shown in FIG. 9 has a plurality of detachable protrusions 160. FIG. 9 shows an example in which a plurality of protrusions 160 are configured to be detachable from the slide member 100 through a plurality of holes 165. Attachment / detachment of the plurality of protrusions 160 to / from the slide member 100 using the plurality of holes 165 may be performed by screwing. Also, any method other than screwing may be used. The slide member 100 shown in FIG. 9 includes holes 165 at various positions, and is configured to be able to be coupled to different positions of the slide member 100 by separating the plurality of protrusions 160.

  FIG. 9 shows an example in which the protrusion 110 is formed by two protrusions 160, the protrusion 120 is formed by two protrusions 160, and the protrusion 130 is formed by two protrusions 160. As described above, according to the slide member 100 according to the present embodiment, the projecting portion 110, the projecting portion 120, and the projecting portion 130 can be formed at arbitrary positions, thereby the projecting portion 110, the projecting portion 120, and the projecting portion. The interval of 130 can be changed.

  FIG. 10 schematically shows another example of the slide member 100. Here, differences from FIG. 9 will be mainly described. The slide member 100 illustrated in FIG. 10 includes a plurality of protrusions 160 and a plurality of protrusions 162 having different lengths from the protrusions 160.

  By configuring the protrusions 160 and 162 having different lengths to be detachable, the locking device 10 can be easily mounted even when the lever 310, the lever 320, and the lever 330 are not arranged in a line. Can be made applicable. Note that the slide member 100 may further include other protrusions having different lengths from the protrusions 160 and 162 shown in FIG.

  11 and 12 schematically show another example of the protrusion 110. 11 and 12 is configured such that the length along the direction protruding from the slide member 100 can be changed.

  The protruding part 110 includes a protruding member 112 and a protruding member 114. Each of the protruding member 112 and the protruding member 114 includes a plurality of holes 115.

  The protruding member 112 and the protruding member 114 may be fixed using two holes 115 of the plurality of holes 115. For example, the protruding member 112 and the protruding member 114 are fixed by being screwed by the two holes 115. As a method for fixing the protruding member 112 and the protruding member 114, any method other than screwing may be used. By changing the relative positions of the projecting member 112 and the projecting member 114, the projecting portion 110 expands and contracts in the direction projecting from the slide member 100, thereby changing the length of the projecting portion 110.

  11 and 12, an example in which the length of the protruding portion 110 can be changed by relatively moving and fixing the protruding member 112 and the protruding member 114 with the plurality of holes 115 has been described. However, it is not limited to this. The protruding member 112 and the protruding member 114 do not include the plurality of holes 115 but include other configurations such as a rail structure, so that the protruding member 112 and the protruding member 114 may be relatively moved and fixed.

  The projecting portion 120 and the projecting portion 130 may have the same configuration as the projecting portion 110, so that the length may be changed by expanding and contracting in the direction projecting from the slide member 100.

  As shown in FIGS. 11 and 12, when the lengths of the protrusion 110, the protrusion 120, and the protrusion 130 are changed, the lever 310, the lever 320, and the lever 330 are not arranged in a line. Even so, the locking device 10 can be easily applied.

  FIG. 13 schematically shows another example of the locking device 10. FIG. 13 illustrates a case where the lock device 10 selectively prevents the lever 310, the lever 320, the lever 330, and the lever 340 from being switched between the ON position and the OFF position.

  The slide member 100 provided in the locking device 10 shown in FIG. 13 includes a protruding portion 110, a protruding portion 120, a bifurcated protruding portion 130, and a bifurcated protruding portion 140. Here, differences from the locking device 10 shown in FIGS. 1 to 3 will be mainly described.

  The locking device 10 shown in FIG. 13 enables switching between the ON position and the OFF position of only the lever 310 among the lever 310, the lever 320, the lever 330, and the lever 340 by sliding the slide member 100. A first state in which the lever 320, the lever 330, and the lever 340 are prevented from being switched from the OFF position to the ON position by the protrusion 120, the protrusion 130, and the protrusion 140, and the lever 310, the lever 320, the lever 330, and the lever Of the 340, only the lever 320 can be switched between the ON position and the OFF position. The protrusion 110, the protrusion 130, and the protrusion 140 change the lever 310, the lever 330, and the lever 340 from the OFF position to the ON position. The second state in which the switching of the lever 310, the lever 320, and the lever 33 is prevented. , And the lever 340, only the lever 330 can be switched between the ON position and the OFF position. The protrusion 110, the protrusion 120, and the protrusion 140 allow the lever 310, the lever 320, and the lever 340 to be switched from the OFF position. Of the lever 310, the lever 320, the lever 330, and the lever 340, only the lever 340 can be switched between the ON position and the OFF position in the third state that prevents the switch to the ON position. The fourth state in which switching of the lever 310, the lever 320, and the lever 330 from the OFF position to the ON position is switched by the portion 120 and the protrusion 130.

  As shown in FIG. 13, the locking device 10 according to the present embodiment enables switching between the ON position and the OFF position of only one of the four levers, and switches the other levers from the OFF position to the ON position. Switching can also be prevented. Similarly, the locking device 10 according to the present embodiment enables switching between the ON position and the OFF position of only one of the five or more levers by increasing the number of protrusions of the slide member 100. It is also possible to prevent the other lever from being switched from the OFF position to the ON position.

  14, 15 and 16 schematically show another example of the locking device 10. In the locking device 10 shown in FIGS. 14 to 16 and the locking device 10 shown in FIGS. 1 to 3, the base 202 has a recess 222, a recess 224, and a recess 226, and the base 204 is a recess. 24, the depression 244, and the depression 246. Here, differences from the locking device 10 shown in FIGS. 1 to 3 will be mainly described.

  The recess 222, the recess 224, and the recess 226 may extend downward from the opening 203 of the base 202. The knob 102 may be inserted into the recess 222, the recess 224, and the recess 226. As for the hollow part 222, the hollow part 224, and the hollow part 226, a part of knob 102 may be insertable, and the whole knob 102 may be insertable. The hollow part 222 may be an example of a first hollow part. The recess 224 may be an example of a second recess. The recess 226 may be an example of a third recess.

  The recess 242, the recess 244, and the recess 246 may extend downward from the opening 205 of the base 204. The knob 104 may be inserted into the recess 242, the recess 244, and the recess 246. As for the hollow part 242, the hollow part 244, and the hollow part 246, a part of the knob 104 may be insertable, or the entire knob 104 may be insertable.

  The locking device 10 is in the first state when the knob 102 and the knob 104 are inserted into the recess 222 and the recess 242, respectively. Further, the locking device 10 is released from the insertion of the knob 102 and the knob 104 into the recess 222 and the recess 242, and the knob 102 and the knob 104 slide through the opening 203 and the opening 205, respectively. Are inserted into the recess 224 and the recess 244, respectively, so that the second state is obtained. In addition, the locking device 10 is released from the insertion of the knob 102 and the knob 104 into the recess 224 and the recess 244, and the knob 102 and the knob 104 slide through the opening 203 and the opening 205, respectively. Are inserted into the recess 226 and the recess 246, respectively, so that the third state is obtained.

  By adopting such a configuration, for example, when the locking device 10 is in the first state, it is possible to prevent the slide member 100 from moving due to the recessed portion 222 and the recessed portion 242, and the first state is inadvertently set. Can be prevented from being released. Further, for example, when the locking device 10 is in the second state, it is possible to prevent the slide member 100 from being moved by the recessed portion 224 and the recessed portion 244, and the second state is inadvertently released. Can be prevented. Further, for example, when the locking device 10 is in the third state, it is possible to prevent the slide member 100 from being moved by the recess 226 and the recess 246, and the third state is inadvertently released. Can be prevented.

  As mentioned above, although this invention was demonstrated using embodiment, the technical scope of this invention is not limited to the range as described in the said embodiment. It will be apparent to those skilled in the art that various modifications or improvements can be added to the above-described embodiment. It is apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

  The order of execution of each process such as operations, procedures, steps, and stages in the apparatus, system, program, and method shown in the claims, the description, and the drawings is particularly “before” or “prior to”. It should be noted that it can be realized in any order unless the output of the previous process is used in the subsequent process. Regarding the operation flow in the claims, the description, and the drawings, even if it is described using “first,” “next,” etc. for convenience, it means that it is essential to carry out in this order. It is not a thing.

DESCRIPTION OF SYMBOLS 10 Locking device, 100 Slide member, 102 Knob, 104 Knob, 110 Projection part, 112 Projection member, 114 Projection member, 115 Hole, 120 Projection part, 130 Projection part, 140 Projection part, 151 Slide part, 152 Slide part, 153 Slide part, 155 hole, 160 protrusion part, 162 protrusion part, 165 hole, 202 base, 203 opening, 204 base, 205 opening, 222 depression part, 224 depression part, 226 depression part, 242 depression part, 244 depression part 246 Recessed part, 310 lever, 320 lever, 330 lever, 340 lever

Claims (15)

The base,
A slide member slidably attached to the base,
The slide member has at least three protrusions for preventing switching of the lever from the OFF position to the ON position;
At least one of the at least three protrusions is bifurcated;
Locking device. The at least three protrusions include a first protrusion, a second protrusion, and a bifurcated third protrusion,
By sliding the slide member,
Of the first lever, the second lever, and the third lever, only the first lever can be switched between the ON position and the OFF position, and the second lever and the third protrusion allow the second lever to be switched. And a first state for preventing switching of the third lever from the OFF position to the ON position;
Of the first lever, the second lever, and the third lever, only the second lever can be switched between the ON position and the OFF position, and the first protrusion and the third protrusion A second state that prevents switching of the first lever and the third lever from the OFF position to the ON position;
Of the first lever, the second lever, and the third lever, only the third lever can be switched between the ON position and the OFF position, and the first protrusion and the second protrusion The locking device according to claim 1, wherein the first state and the third state in which the second lever is prevented from being switched from the OFF position to the ON position are switched.   The locking device according to claim 2, wherein the gap between the third protrusions is wider than a width of the third lever.   The width of the first protrusion is twice the width of the first lever. In the second state and the third state, the first protrusion is in contact with the full width of the first lever. The locking device according to claim 2 or 3, wherein the switching of the first lever from the OFF position to the ON position is prevented.   The width of the first protrusion is the same as the width of the first lever. In the second state and the third state, the first protrusion abuts a part of the entire width of the first lever. The locking device according to claim 2, wherein the first lever is prevented from being switched from the OFF position to the ON position.   The width of the first protrusion is narrower than the width of the first lever. In the second state and the third state, the first protrusion is in contact with a part of the entire width of the first lever. The locking device according to claim 2, wherein the first lever is prevented from being switched from an OFF position to an ON position.   The lock device according to any one of claims 2 to 6, wherein the first lever, the second lever, and the third lever are levers that switch ON / OFF of power supply breakers of different systems. The slide member has a knob protruding from an opening formed in the base,
The base has a first dent, a second dent, and a third dent extending from the opening,
The locking device is in the first state when the knob is inserted into the first recess, and is in the second state when the knob is inserted into the second recess, and the knob is in the first state. The locking device according to any one of claims 2 to 7, wherein the locking device is in the third state by being inserted into the three recesses.   The lock device according to any one of claims 1 to 8, wherein the slide member is configured to be able to change a distance between the at least three protrusions.   The locking device according to claim 9, wherein an interval between the at least three protrusions changes as the slide member expands and contracts.   The lock device according to claim 9, wherein the slide member is configured to be able to separate the at least three protrusions and to be coupled to different positions of the slide member.   The locking device according to any one of claims 1 to 11, wherein the at least three projecting portions are configured to be capable of changing a length along a direction projecting from the slide member.   The locking device according to claim 12, wherein the length of the at least three projecting portions changes by extending and contracting in a direction projecting from the slide member.   The locking device according to claim 12, wherein the slide member is configured to be able to separate the at least three protrusions and to connect a protrusion having a length different from that of the at least three protrusions. The at least three protrusions include a first protrusion, a second protrusion, and a bifurcated third protrusion,
The base includes a first base that supports the slide member between the first protrusion and the second protrusion, and the slide member between the second protrusion and the third protrusion. The locking device according to claim 1, further comprising a second base that supports the second base.

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