Wheel unit, and wheel type movable body

Abstract

To provide a wheel unit, and a wheel type movable body capable of preventing unintentional movement of a movable body through securely locking the wheel by simple operation.SOLUTION: A wheel unit 1 comprises a stopper part 70 mounted on a body part 20, and a part 14 to be stopped mounted on the wheel part 10. The stopper part 70 is an electromagnet. When power is turned on and voltage is applied to the stopper 70 via an electrode terminal part 50 disposed in a nested manner in a main shaft part 40, a magnetic field is generated to attach the electromagnet on the part 14 made of metal pieces to be stopped to allow rotation of the wheel part 10 to be limited.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a wheel unit and a wheeled vehicle, and more particularly to a wheel unit and a wheeled vehicle that can reliably lock the wheels with a simple operation and prevent unintended movement of the vehicle. [Background technology]

[0002] Mobile objects that have wheels and are transported along a floor surface, such as stretchers, nursing care beds, strollers, etc., are widely used. Various wheel units equipped with wheel locking mechanisms have been proposed to prevent these mobile objects from moving unintentionally.

[0003] For example, Patent Document 1 discloses a mechanism for locking a wheel by providing a gear-shaped portion on the wheel and providing a rotatable pedal approximately above the wheel cover, allowing the user to operate the pedal with their foot to rotate it, and then fitting a locking member connected to the pedal into a recess in the gear-shaped portion of the wheel and locking it. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Publication No. 7-284430 Summary of the Invention [Problem to be solved by the invention]

[0005] The wheel unit disclosed in Patent Document 1 is a mechanism in which the user operates a pedal with their foot to lock and unlock the wheels, but operating the pedal requires a certain amount of force, and it may take some time for women or elderly people with weak pedaling force, or for users who are unfamiliar with pedal operation, to lock the wheels. Furthermore, if the pedaling force is weak, the wheels may be locked in an incomplete state, causing the mobile object to move unintentionally.

[0006] The present invention was devised in consideration of the above points, and aims to provide a wheel unit and a wheeled mobile body that can reliably lock wheels with a simple operation and prevent unintended movement of the mobile body. [Means for solving the problem]

[0007] In order to achieve the above-mentioned object, the wheel unit of the present invention comprises a main body portion, a main shaft portion having a connecting portion that can be connected to a body to be mounted and supported on the main body portion, an electrode terminal portion made of a conductive material including a first terminal portion made of a first electrode and a second terminal portion made of a second electrode, a stopper portion connected to the electrode terminal portion via a lead wire and generating a magnetic force when electricity is passed through it, a wheel portion supported on the main body portion via an axle portion so as to be rotatable around a horizontal axis, a tire portion attached to the outer periphery of the wheel portion, and a wheel portion arranged opposite the stopper portion and having a stoppered portion with which the stopper portion abuts or engages when electricity is passed through, thereby restricting the rotation of the wheel portion.

[0008] Here, the wheel unit has a main body portion, and by attaching each part, including the main shaft portion described below, to the main body portion, they can be integrated into the wheel unit.

[0009] Furthermore, by having a coupling portion that can be coupled to the object to be mounted and a main shaft portion supported by the main body portion, the wheel unit can be coupled to the object to be mounted by the main shaft portion.

[0010] Furthermore, by providing an electrode terminal section made of a conductive material including a first terminal section made of a first electrode and a second terminal section made of a second electrode, by connecting the power source and the electrode terminal section, electricity supplied from the power source can be supplied to the stopper section described below via the electrode terminal section, thereby activating the stopper section.

[0011] Furthermore, by providing a stopper portion that is connected to the electrode terminal portion via a lead wire and generates magnetic force when current is applied, the electromagnetic operating state and inactive state of the stopper portion can be switched by turning the power on and off.

[0012] Furthermore, by providing the wheel section with a wheel section that is rotatably supported around a horizontal axis via an axle section on the main body section, a tire section that is attached to the outer periphery of the wheel section, and a stoppered section that is arranged opposite a stopper section and with which the stopper section abuts or engages when current is applied to restrict the rotation of the wheel section, when the stopper section is electromagnetically activated, the stopper section abuts or engages with the stoppered section that is arranged opposite, thereby enabling the wheel section to be reliably locked with a simple configuration.

[0013] As described above, by attaching the wheel unit to a mobile object (stretcher, nursing bed, stroller, etc.) that is the object to be attached, the wheel part is unlocked when the stopper part is in the inactive state, allowing the mobile object to be moved easily. In addition, by electromagnetically activating the stopper part so that the stopper part abuts or engages with the object to be stopped, the wheel part is locked and the mobile object can be prevented from moving unintentionally.

[0014] Furthermore, if the main shaft portion is cylindrical and rotatably supported around a vertical axis relative to the main body portion, the main shaft portion rotates when the wheel unit is attached to the object to be attached, making it easy to change the direction of the object to be attached.

[0015] In addition, the first terminal portion and the second terminal portion are rod-shaped bodies extending from the base end to the tip end, and the first terminal portion and the second terminal portion are nested inside the main shaft portion, and when the main shaft portion, the first terminal portion, and the second terminal portion are connected to a common rotation axis so that they can rotate integrally, the main shaft portion and the electrode terminal portion can be arranged within a limited space, preventing the wheel unit from becoming larger.

[0016] Furthermore, when the second terminal portion is nested inside the first terminal portion so that a rod-shaped body of a predetermined length is exposed from the base end, the first terminal portion and the second terminal portion can be arranged within a limited space, preventing the wheel unit from becoming larger.

[0017] Furthermore, when the first terminal portion has a first conductive portion to which a lead wire is connected, a first protrusion portion that protrudes radially at a predetermined axial position, and a first contact portion made of an elastic material that connects the first conductive portion and the first protrusion portion, electricity input to the first terminal portion is input to the stopper portion from the first contact portion via the lead wire.

[0018] In this case, the first current-carrying part to which the lead wire is connected is ring-shaped and loosely inserted into the first terminal part, so that even if the body of the first terminal part rotates integrally with the main shaft part, the first current-carrying part to which the lead wire is connected does not rotate, thereby preventing the lead wire from wrapping around the body of the first terminal part or breaking.

[0019] In addition, when the second terminal portion has a second conductive portion to which the lead wire is connected, a second protrusion portion that protrudes radially at a predetermined axial position, and a second contact portion made of an elastic material that connects the second conductive portion and the second protrusion portion, electricity input to the second terminal portion is input to the stopper portion from the second contact portion via the lead wire.

[0020] As with the first terminal portion, the second terminal portion also has a second current-carrying portion to which the lead wire is connected that is ring-shaped and loosely inserted into the second terminal portion. Therefore, even if the body of the second terminal portion rotates integrally with the main shaft portion, the second current-carrying portion to which the lead wire is connected does not rotate, thereby preventing the lead wire from becoming wrapped around the body of the second terminal portion or breaking.

[0021] Furthermore, if the stopper portion is an electromagnet and the stopped portion is a metal piece that can be magnetically attracted to the electromagnet when electricity is applied, the stopper portion will not operate when electricity is not applied, and will generate magnetic force only when electricity is applied, causing it to be magnetically attracted to the stopped portion, thereby reliably restricting the rotation of the wheel portion.

[0022] Furthermore, if the stopper portion is a solenoid having a movable iron core to which a rod is connected, and the stopped portion is an engagement hole formed so that the rod that protrudes as the movable iron core moves when current is applied to the solenoid can engage with it, the stopper portion does not operate when current is not applied, and the rod protrudes as the movable iron core moves only when current is applied, and the protruding rod engages with the engagement hole, which is the stopped portion, thereby reliably restricting the rotation of the wheel portion.

[0023] In addition, the wheel section has a pair of wheels that are rotatably supported at both ends of the main body section at a predetermined distance, and when the stopper section and the stoppered section are installed on each of the pair of wheels, the stopper section and the stoppered section are arranged on each of the wheels, so that the rotation of the wheel section can be reliably restricted even in the case of a double wheel. [Effects of the Invention]

[0024] The wheel unit and wheeled vehicle according to the present invention can reliably lock the wheels with a simple operation, thereby preventing unintended movement of the vehicle. [Brief explanation of the drawings]

[0025] [Figure 1] 1A and 1B are diagrams showing a wheel unit according to a first embodiment of the present invention, where (a) is a front view and (b) is a perspective view. [Figure 2] FIG. 2 is an exploded view of the wheel unit according to the first embodiment of the present invention. [Figure 3] 1 is a side cross-sectional view of a wheel unit according to a first embodiment of the present invention. [Figure 4] 5A and 5B are diagrams showing a wheel unit according to a second embodiment of the present invention, in which (a) is a front view and (b) is an enlarged view of a stoppered portion. DETAILED DESCRIPTION OF THE INVENTION

[0026] Hereinafter, a wheel unit and a wheeled vehicle according to an embodiment of the present invention will be described with reference to the drawings to facilitate understanding of the present invention. In each drawing, for the sake of convenience, when the wheel unit is installed on an installation surface, the direction facing upward is defined as the upward direction, the direction opposite to the upward direction is defined as the downward direction, the axial direction represented by the upward and downward directions is defined as the vertical axis, and the axial direction perpendicular to the vertical axis is defined as the horizontal axis.

[0027] 1. First embodiment 1 to 3 are diagrams showing a wheel unit 1 according to a first embodiment of the present invention. As shown in Fig. 1, the wheel unit 1 is a dual-wheel type having a first wheel portion 11a and a second wheel portion 11b on the left and right sides when viewed from the front, and these wheel portions 11a and 11b are attached to a main body portion 20 on the left and right sides via a common axle portion 30.

[0028] [Main body] As shown in Figure 2, the main body 20 is composed of a pair of symmetrical half parts, and axle holes 21a and 21b are formed at approximately the center of the main body 20a and main body 20b, respectively, through which the axle 30 for attaching the wheel unit 10 passes.

[0029] The main body 20a is provided with a fitting hole 22a into which a first electromagnet 71a, which serves as a stopper 70 described below and comes into contact with the first wheel 11a to restrict rotation of the first wheel 11a, is loosely fitted. The other main body 20b is provided with a substantially rectangular support groove 23b that can be loosely fitted with a substantially rectangular first base 72a attached to the base end of the first electromagnet 71a.

[0030] The main body 20b has a symmetrical shape to the main body 20a, and is formed with a fitting hole 22b into which a second electromagnet 71b that abuts against the second wheel 11b to restrict rotation of the second wheel 11b is loosely fitted. The other main body 20a is formed with a substantially rectangular support groove 23a that can loosely fit with a substantially rectangular second base 72b attached to the base end of the second electromagnet 71b.

[0031] Here, the support grooves 23a and 23b do not necessarily have to be rectangular in shape, but by forming them rectangular in shape, it is possible to restrict the movement of the first electromagnet 71a and the second electromagnet 71b in the rotational direction that accompanies the rotation of the wheel unit 10.

[0032] Long slot grooves 24a, 24b are formed in the height direction of main bodies 20a, 20b, respectively, into which main shaft 40 and electrode terminal 50, which will be described later, can be fitted. Furthermore, first fitting grooves 25a, 25b, into which flange 43 of main shaft 40, which will be described later, is fitted, are formed at predetermined positions in the length direction of long slot grooves 24a, 24b so as to be perpendicular to long slot grooves 24a, 24b.

[0033] In addition, below the first fitting grooves 25a, 25b, second fitting grooves 26a, 26b and third fitting grooves 27a, 27b are formed, into which the first protrusion portion 52a and first conductive portion 53a of the first terminal portion 51a respectively fit, and further, fourth fitting grooves 28a, 28b and fifth fitting grooves 29a, 29b are formed, into which the second protrusion portion 52b and second conductive portion 53b of the second terminal portion 51b respectively fit.

[0034] [Main shaft] The main shaft 40 has a coupling part 41 at its tip that can be coupled to a mounting portion of a stretcher, nursing bed, stroller, etc. (hereinafter referred to as "mobile object") to which the wheel unit 1 is attached, and the base end side, which is the opposite side of the coupling part 41, is made up of a substantially cylindrical body with an open end, inside which an electrode terminal part 50 (described below) is nested. A through hole is formed at the top of the coupling part 41 so that a lead wire 60 connected to a power source (not shown) can be inserted, and the lead wire 60 is inserted through this through hole to be connected to the electrode terminal part 50.

[0035] The connecting part 41 has a male thread formed on its outer periphery that can be threaded into a female thread that is a mounting part (not shown) formed on the movable body. Also, a nut 42 is attached to the lower end of the connecting part 41 to tighten the connecting part 41 in a state where it is fitted into the female thread of the movable body.

[0036] Main shaft portion 40 has flange portion 43 protruding radially at a predetermined axial position, and is fitted into first fitting grooves 25a, 25b. Although flange portion 43 is not necessarily provided, having flange portion 43 can restrict the vertical movement of main shaft portion 40. Therefore, vertical vibrations when the movable body is moved can be suppressed, and main shaft portion 40 can be prevented from falling off main body portion 20.

[0037] Main shaft 40 configured as described above is held between main bodies 20a and 20b so as to be rotatable about its axis, and is fixed with screws (no reference numeral is given). Because main shaft 40 is rotatably supported relative to main body 20 in this manner, the moving body to which wheel unit 1 is attached can easily change direction in a predetermined direction by rotating main shaft 40.

[0038] [Electrode terminal part] The electrode terminal portion 50 functions as a contact point for outputting electricity from a power source to the electromagnet, and is composed of a negative electrode first terminal portion 51a and a positive electrode second terminal portion 51b, each of which is made of a rod-shaped conductive material extending from the base end to the tip, and the second terminal portion 51b is formed to be a predetermined length longer than the first terminal portion 51a.

[0039] The first terminal portion 51a is cylindrical with an inner diameter that is larger than the outer diameter of the second terminal portion 51b by a predetermined amount, and the second terminal portion 51b is nested within the first terminal portion 51a, and the tip portions of the first terminal portion 51a and the second terminal portion 51b are joined together and integrated with the height positions of the tip portions aligned, and a portion of the second terminal portion 51b is exposed to the outside from the base end side of the first terminal portion 51a downward.

[0040] Electrode terminal portion 50 configured as described above is nested within main shaft portion 40 so that main shaft portion 40 and electrode terminal portion 50 are concentric in plan view, and main shaft portion 40 and electrode terminal portion 50 are integrated with their tips aligned, allowing main shaft portion 40 and electrode terminal portion 50 to rotate about a common rotation axis. Lead wire 60 extending from a power source is inserted into the insertion hole in main shaft portion 40 and connected to first terminal portion 51 a and second terminal portion 51 b, respectively.

[0041] Here, electrode terminal portion 50 does not necessarily have to be nested within main shaft portion 40, and main shaft portion 40 and electrode terminal portion 50 do not necessarily have to be integrated, and main shaft portion 40 and electrode terminal portion 50 may be arranged as separate bodies. However, by integrating main shaft portion 40 and electrode terminal portion 50 by arranging them nested, main shaft portion 40 and electrode terminal portion 50 can be arranged efficiently within space-saving main body portion 20.

[0042] The electrode terminal portion 50 is configured to be longer than the main shaft portion 40 by a predetermined amount, and furthermore, as described above, the second terminal portion 51b is configured to be longer than the first terminal portion 51a by a predetermined amount, so that the second terminal portion 51b and the first terminal portion 51a are each exposed to the outside from the base end side downward.

[0043] A first protrusion 52a protrudes radially from a predetermined position exposed to the outside of the first terminal 51a, a ring-shaped first current-carrying portion 53a is loosely inserted below the first protrusion 52a, and a first contact portion 54a made of an elastic material that connects the first protrusion 52a and the first current-carrying portion 53a is loosely inserted between the first protrusion 52a and the first current-carrying portion 53a. A negative-side first lead wire 61a that is connected to the first electromagnet 71a and the second electromagnet 71b is connected to the first current-carrying portion 53a.

[0044] Similarly, a second protrusion 52b protrudes radially from a predetermined position exposed to the outside of the second terminal 51b, a ring-shaped second current-carrying portion 53b is loosely inserted below the second protrusion 52b, and a second contact portion 54b made of an elastic material that connects the second protrusion 52b and the second current-carrying portion 53b is loosely inserted between the second protrusion 52b and the second current-carrying portion 53b. A positive-side second lead wire 61b that is connected to the first electromagnet 71a and the second electromagnet 71b is connected to the second current-carrying portion 53b.

[0045] Here, the first contact portion 54a and the second contact portion 54b do not necessarily have to be made of an elastic material, but if the first contact portion 54a and the second contact portion 54b are made of an elastic material, they can absorb the impact force when the main shaft portion 40 moves up and down, and prevent damage to the electrode terminal portion 50.

[0046] With the above configuration, when main shaft 40 rotates about its axis, electrode terminal 50 also rotates integrally, but because first current-carrying portion 53a and second current-carrying portion 53b, to which lead wire 60 connecting first electromagnet 71a and second electromagnet 71b is connected, are loosely inserted into first terminal 51a and second terminal 51b, first current-carrying portion 53a and second current-carrying portion 53b do not rotate integrally even when electrode terminal 50 rotates about its axis. Therefore, lead wire 60 connected to first electromagnet 71a and second electromagnet 71b is not likely to twist or wrap around as main shaft 40 rotates, and there is also no risk of the lead wire breaking due to twisting or wrapping.

[0047] On the other hand, the first contact portion 54a and the second contact portion 54b ensure that electricity supplied from the power source is supplied to the first electromagnet 71a and the second electromagnet 71b via the first terminal portion 51a and the second terminal portion 51b.

[0048] [Stopper part] The stopper portion 70 is a cylindrical electromagnet that generates magnetic force when electricity is applied, and a first electromagnet 71a and a second electromagnet 71b corresponding to the first wheel portion 11a and the second wheel portion 11b, respectively, are installed on the main body portion 20a and the main body portion 20b.

[0049] The first electromagnet 71a is composed of first teeth 73a made of a magnetic material and first windings 74a wound around the outer periphery of the first teeth 73a. Similarly, the second electromagnet 71b is composed of second teeth 73b and second windings 74b wound around the outer periphery of the second teeth 73b. Note that the first electromagnet 71a and the second electromagnet 71b do not have to be cylindrical and may be, for example, rectangular.

[0050] As described above, a first base portion 72a that can be loosely fitted into the support groove 23b is attached to the base end of the first electromagnet 71a, and a second base portion 72b that can be loosely fitted into the support groove 23a is attached to the base end of the second electromagnet 71b. When the power is off and no voltage is applied, the first electromagnet 71a and the second electromagnet 71b are supported by the main body 20 with a predetermined gap formed between them and the first stoppered portion 14a and the second stoppered portion 14b that constitute the stoppered portion 14 described below.

[0051] Furthermore, the first electromagnet 71a and the second electromagnet 71b are connected to the first terminal 51a and the second terminal 51b via the negative first lead wire 61a and the positive second lead wire 61b, respectively. When electricity is supplied from a power source and a voltage is applied to the first electromagnet 71a and the second electromagnet 71b, a magnetic field is generated. This magnetic field is generated upward from the upper ends of the first teeth 73a and the second teeth 73b.

[0052] [Wheel section] The wheel unit 10 is composed of a first wheel unit 11a and a second wheel unit 11b arranged on the left and right sides in a front view, and is rotatably supported by an axle unit 30 relative to the main body unit 20.

[0053] The first wheel portion 11a has a first wheel portion 12a and a first tire portion 13a attached to the outer periphery of the first wheel portion 12a, and on the back side of the first wheel portion 12a, a first stoppered portion 14a is arranged across the entire surface, facing the first electromagnet 71a with a predetermined gap formed therebetween.

[0054] In addition, the second wheel portion 11b has a second wheel portion 12b and a second tire portion 13b attached to the outer periphery of the second wheel portion 12b, and on the back side of the second wheel portion 12b, a second stoppered portion 14b is arranged across the entire surface, facing the second electromagnet 71b with a predetermined gap formed therebetween.

[0055] The first stoppered portion 14a and the second stoppered portion 14b that make up the stoppered portion 14 are each made up of a metal piece, and when electricity is supplied from a power source and a voltage is applied to the first electromagnet 71a and the second electromagnet 71b, respectively, to generate a magnetic field, the first electromagnet 71a and the second electromagnet 71b, which are loosely fitted into the main body portion 20, become magnetically attached to the first stoppered portion 14a and the second stoppered portion 14b, respectively, thereby restricting the rotation of the first wheel portion 11a and the second wheel portion 11b.

[0056] It should be noted that the first stoppered portion 14a and the second stoppered portion 14b do not need to be made of metal pieces, but rather, when a voltage is applied to the first electromagnet 71a and the second electromagnet 71b, the first electromagnet 71a and the second electromagnet 71b each need only be made of a material that can be magnetically attracted to them.

[0057] Furthermore, the first stoppered portion 14a and the second stoppered portion 14b do not necessarily have to be arranged on the entire back side of the first wheel portion 12a and the second wheel portion 12b, respectively, and the installation area can be changed appropriately depending on the size of the first electromagnet 71a and the second electromagnet 71b to be magnetically attached.

[0058] The wheel unit 1 configured as described above is attached to a mobile object such as a stretcher, a nursing bed, or a stroller. When a nearby power source is turned on while the mobile object is moving, electricity is supplied from the power source to the stopper portion 70, and a magnetic field is generated by the applied voltage. At this time, the stopper portion 70 is magnetically attracted to the stopped portion 14, restricting the rotation of the wheel portion 10 and allowing the mobile object to be stopped safely.

[0059] 2. Second embodiment Next, a wheel unit 1a according to a second embodiment of the present invention will be described with reference to Fig. 4. In the following description, the same reference numerals will be used for components common to the first embodiment, and further overlapping descriptions will be omitted, with only the different components being described in detail.

[0060] The wheel unit 1a according to the second embodiment has the same configuration as the first embodiment except for the configuration of the stopper portion and the stopped portion. As shown in Fig. 4, the stopper portion 70 of the wheel unit 1a according to the second embodiment is a solenoid electromagnet and has a first solenoid 75a and a second solenoid 75b.

[0061] The first solenoid 75a is a push-type solenoid that is configured from a bobbin (not numbered) inside a housing (not numbered), a first winding 76a wound around the bobbin, and a first movable iron core 77a that is slidable along the central axis of the first solenoid 75a. A first rod 78a made of an insulating material that can engage with a first stopped portion 15a (described later) is connected to the tip of the first movable iron core 77a.

[0062] The second solenoid 75b is also a similar push-type solenoid, and is configured from a bobbin (not numbered) inside a housing (not numbered), a second winding 76b wound around the bobbin, and a second movable iron core 77b that is slidable along the central axis of the second solenoid 75b. A second rod 78b made of an insulating material that can engage with a second stopped portion 15b (described later) is connected to the tip of the second movable iron core 77b.

[0063] The first movable iron core 77a and the second movable iron core 77b are supported by a first biasing member 79a and a second biasing member 79b that bias in one direction from one end to the other, and when the first solenoid 75a and the second solenoid 75b are not energized, the first rod 78a and the second rod 78b are maintained stopped in a retracted position retracted toward the housing side.

[0064] On the other hand, when the first solenoid 75a and the second solenoid 75b are excited by energization, a magnetic force is generated in a direction that resists the biasing forces of the first biasing member 79a and the second biasing member 79b. This causes the first movable iron core 77a to be attracted inward of the first winding 76a, and the second movable iron core 77b to be attracted inward of the second winding 76b, thereby driving the first rod 78a and the second rod 78b in a direction that protrudes from the housing.

[0065] 4, the first stoppered portion 15a and the second stoppered portion 15b that constitute the stoppered portion 15 have first engagement holes 16a and second engagement holes 16b formed at equal intervals in the circumferential direction. When the power is turned on and the first solenoid 75a and the second solenoid 75b are excited, the first rod 78a and the second rod 78b engage with the first engagement hole 16a and the second engagement hole 16b, respectively, and the rotation of the first wheel portion 11a and the second wheel portion 11b is restricted.

[0066] The present invention has been described above based on the first and second embodiments, but the present invention is not limited to the above-described embodiments, and various improvements and modifications are possible within the scope of the present invention.

[0067] For example, although the embodiment has been described with respect to a dual-wheel type wheel unit 1, the wheel unit 1 can also be applied to a single-wheel type. Furthermore, the wheel unit 1 according to the present invention can be applied to a variety of moving bodies.

[0068] As described above, the wheel unit and wheeled vehicle according to the present invention can reliably lock the wheels with a simple operation and prevent unintended movement of the vehicle. [Explanation of symbols]

[0069] 1, 1a Wheel unit 10 Wheel section 11a 1st wheel section 11b 2nd wheel section 12a First wheel section 12b Second wheel section 13a First tire section 13b Second tire section 14a, 15a First stoppered portion 14b, 15b Second stoppered portion 16a 1st engagement hole 16b 2nd engagement hole 20, 20a, 20b Main body 21a, 21b Axle hole 22a, 22b fitting hole 23a, 23b Support groove 24a, 24b long hole groove 25a, 25b 1st fitting groove 26a, 26b 2nd fitting groove 27a, 27b 3rd fitting groove 28a, 28b 4th fitting groove 29a, 29b 5th fitting groove 30 Axle section 40 Main shaft section 41 Joint 42 Nut 43 Tsuba 50 Electrode terminal section 51a 1st terminal section 51b 2nd terminal section 52a 1st protrusion 52b 2nd protrusion 53a 1st current carrying part 53b 2nd current carrying part 54a First contact part 54b 2nd contact part 60 lead wire 61a First lead wire 61b Second lead wire 70 Stopper part 71a 1st electromagnet 71b 2nd electromagnet 72a First base part 72b Second base part 73a 1st Teeth 73b 2nd Teeth 74a, 76a 1st winding 74b, 76b Second winding 75a First solenoid 75b Second solenoid 77a First movable core 77b Second movable core 78a First Rod 78b Second Rod 79a First biasing member 79b Second biasing member

Claims

1. a main body; a main shaft portion supported by the main body portion and having a coupling portion that can be coupled to a mounting object; an electrode terminal portion made of a conductive member, the electrode terminal portion including a first terminal portion made of a first electrode and a second terminal portion made of a second electrode; a stopper portion connected to the electrode terminal portion via a lead wire and generating a magnetic force when energized; The vehicle wheel assembly includes a wheel section supported on the main body section via an axle so as to be rotatable about a horizontal axis, a tire section attached to the outer periphery of the wheel section, and a wheel assembly having a stopped section disposed opposite to the stopper section, with the stopper section contacting or engaging with the stopper section when energized to restrict the rotation of the wheel section. Wheel unit.

2. the main shaft portion is cylindrical and rotatably supported about a vertical axis relative to the main body portion, the first terminal portion and the second terminal portion are rod-shaped bodies that are longer than the main shaft portion by a predetermined amount, The first terminal portion and the second terminal portion are nested inside the main shaft portion, and the main shaft portion, the first terminal portion, and the second terminal portion are connected to each other so as to be rotatable integrally with each other about a common rotation axis. The wheel unit according to claim 1 .

3. the second terminal portion is nested inside the first terminal portion so that a rod-shaped body of a predetermined length is exposed from a base end thereof, the first terminal portion has a first protrusion portion into which a ring-shaped first current-carrying portion to which the lead wire is connected loosely inserted, and which protrudes radially at a predetermined position in the axial direction, and a first contact portion made of an elastic material which connects the first current-carrying portion and the first protrusion portion; The second terminal portion has a ring-shaped second current-carrying portion to which the lead wire is connected loosely inserted, a second protrusion portion that protrudes radially at a predetermined position in the axial direction, and a second contact portion made of an elastic material that connects the second current-carrying portion and the second protrusion portion. The wheel unit according to claim 2 .

4. the stopper portion is an electromagnet, The stopped portion is a metal piece to which the electromagnet can be magnetically attracted when energized. The wheel unit according to claim 1 or 2.

5. the stopper portion is a solenoid having a movable iron core to which a rod is connected, The stopped portion is an engagement hole formed so that the rod can be engaged with the engagement hole, which projects as the movable iron core moves when the solenoid is energized. The wheel unit according to claim 1 or 2.

6. The wheel unit has a pair of wheels rotatably supported at both ends of the main body unit at a predetermined interval, The stopper portion and the stopped portion are respectively installed on the pair of wheels. The wheel unit according to claim 1 or 2.

7. A vehicle equipped with the wheel unit according to claim 1 or 2. Wheeled moving object.

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