WO2023074263A1

WO2023074263A1 - Wheel lock system and conveyance body

Info

Publication number: WO2023074263A1
Application number: PCT/JP2022/036911
Authority: WO
Inventors: 真史山口
Original assignee: トヨフレックス株式会社
Priority date: 2021-10-26
Filing date: 2022-10-03
Publication date: 2023-05-04
Also published as: JP2023064221A

Abstract

The purpose of the present invention is to certainly restrict the rotation of a rotary shaft member in a locked state. Provided is a wheel lock system comprising: a wheel; a rotary shaft member attached to the wheel; a bearing that rotatably supports the rotary shaft member; and a lock mechanism that switches between an unlocked state that allows the rotation of the rotary shaft member and a locked state that restricts the rotation of the rotary shaft member. The lock mechanism includes: a rope wound around the rotary shaft member one or more turns; and a control member which includes a suspension from which the rope is suspended and which switches the state of the suspension between a state in which the suspension is located in a separated position separated from the rotary shaft member and a state in which the suspension is located in a proximity position closer to the rotary shaft member than the separated position. The lock mechanism is configured such that when the suspension is in the separated position, the rotary shaft member is tightened by the rope and the locked state is achieved, whereas when the suspension is in the proximity position, the rope is loosened and the unlocked state is achieved.

Description

Wheel locking system and carrier

The technology disclosed in this specification relates to wheel lock systems and carriers.

For example, transport bodies that have wheels and are transported along the floor are widely used, such as suitcases, trolleys, and stretchers. In order to prevent unintended movement of the carriage and/or to regulate the speed of movement of the carriage, various wheel locking systems have been proposed which are capable of restricting (locking) the rotation of the wheels. Patent Literature 1 describes, as a wheel lock system, a system that regulates the rotation of tires by the tension of a brake band that is wound half a turn around a brake drum.

U.S. Pat. No. 6,488,130

In the wheel lock system disclosed in Patent Document 1, since the brake band is wound only halfway around the brake drum, the wheel cannot be reliably locked by the brake band unless the brake band is pulled with a large force. There is Moreover, since the brake band is used to regulate the rotation of the wheel, it can only be applied to relatively large-diameter wheels, and there is also the problem that the downsizing of the device cannot be achieved.

This specification discloses a technology capable of solving at least part of the above-described problems.

The technology disclosed in this specification can be implemented, for example, in the following forms.

(1) The wheel lock system disclosed in the present specification includes a wheel, a rotating shaft member attached to the wheel, a bearing that rotatably supports the rotating shaft member, and a rotation of the rotating shaft member. a lock mechanism for switching the state of the rotating shaft member between an unlocked state in which the rotation of the rotating shaft member is restricted and a locked state in which rotation of the rotating shaft member is restricted. The lock mechanism includes a rope wound around the rotating shaft member one or more times, and a suspension section for suspending the rope, and the suspension section is positioned at a separated position separated from the rotating shaft member. a control member for switching the state of the suspension between a state and a state in which the suspension is positioned closer to the rotating shaft member than the separated position. The lock mechanism tightens the rotating shaft member with the rope to be in the locked state when the suspension portion is positioned at the separated position, and the rope is locked when the suspension portion is positioned at the close position. It is configured to be in the unlocked state by loosening.

In this wheel lock system, the state of the control member that constitutes the lock mechanism is divided into a state in which the suspension section that suspends the rope is located at a separated position away from the rotating shaft member, and a state in which the suspension section approaches the rotating shaft member from the separated position. To achieve switching between an unlocked state allowing rotation of a rotating shaft member and a locked state restricting rotation of the rotating shaft member by a relatively simple configuration for switching between a state located at an approach position and a state located at an approach position. can be done. In addition, in this wheel lock system, since the locked state is achieved by tightening the rotating shaft member with a rope wound around the rotating shaft member for one or more turns, it is necessary for the user to pull some member with a large force. Therefore, the rotation of the rotary shaft member can be reliably restricted in the locked state. In addition, since the present wheel lock system uses a relatively small diameter member called a rope to lock the rotating shaft member, it can be applied to lock a relatively small diameter wheel, and as a result, the size of the device can be reduced. can be realized. As described above, according to the present wheel lock system, it is possible to switch between the unlocked state in which the rotation of the rotating shaft member is permitted and the locked state in which the rotation of the rotating shaft member is restricted with a relatively simple configuration. In addition, it is possible to reliably restrict the rotation of the rotating shaft member in the locked state without requiring a large force, and furthermore, it is possible to reduce the size of the device.

(2) In the above wheel lock system, the rope of the lock mechanism includes a first rope portion wound around the rotary shaft member for one or more turns, and the first rope portion wound around the rotary shaft member. and a second rope portion wound one or more turns in a direction opposite to the direction of rotation, wherein the control member is arranged between the end portion of the first rope portion and the second rope portion at the suspension portion. It is good also as a structure which suspends the edge part of a rope part. According to this wheel lock system, the rotation of the rotating shaft member in one direction can be switched between the unlocked state and the locked state by the first rope portion, and the rotating shaft member can be switched by the second rope portion. For rotation of the member in the other direction, switching between unlocked and locked states can be achieved. Therefore, according to this wheel lock system, it is possible to reliably restrict the rotation of the rotating shaft member in the locked state with respect to the rotation of the rotating shaft member in both directions.

(3) In the above wheel lock system, a biasing member biasing the control member so that the suspension portion of the control member is positioned at the separated position or the approaching position; a force transmission member for transmitting force to the control member so that the suspension portion of the control member is positioned at the approach position or the separation position against the force. According to the present wheel lock system, the rotation shaft member is normally locked, and the force is transmitted from the force transmission member to the control member to shift from the locked state to the unlocked state, thereby improving the operability of the wheel lock system. can be improved.

(4) In the above wheel lock system, the control member swings about a predetermined axis to position the suspension portion in the separated position and in the close position. , wherein the biasing member biases the control member so as to swing in one direction about the predetermined axis, and the force transmission member is configured to switch between the A configuration may be employed in which a force is transmitted to the control member so as to swing the control member in the other direction about the predetermined axis. According to this wheel lock system, switching between the locked state and the unlocked state can be realized with a relatively simple and space-saving configuration.

It should be noted that the technology disclosed in this specification can be implemented in various forms. can be realized in the form of

Explanatory drawing schematically showing the configuration of the suitcase according to the present embodiment. 1 is an external perspective view showing a wheel lock system according to this embodiment; FIG. Figure 3 is an exploded perspective view of the wheel locking system shown in Figure 2; Side view of wheel locking system Side view of wheel locking system VI-VI line sectional view shown in FIG. 4 of the wheel lock system VII-VII line sectional view shown in FIG. 5 of the wheel lock system Exterior perspective view showing a part of the wheel lock system in cross section Appearance perspective view showing part of the wheel lock system Sectional view showing the wheel lock system in a state allowing the wheel to rotate Sectional view showing a state in which the wheels are allowed to rotate in the wheel lock system of the modified example. Sectional view showing a state in which wheel rotation is restricted in a modified wheel lock system

A. Embodiment:
A-1. Suitcase configuration:
FIG. 1 is an explanatory diagram schematically showing the configuration of a suitcase according to this embodiment. Column A of FIG. 1 shows the suitcase 10 with the handle portion 12 to be described later pulled out, and column B shows the suitcase 10 with the handle portion 12 retracted. For convenience of explanation, FIG. 1 also shows a part of the configuration that does not appear on the exterior of the suitcase 10 .

The suitcase 10 is a carrier that is carried along the floor surface, and includes a main body portion 11, a handle portion 12, and caster portions 16. In the following description, it is assumed that the suitcase 10 is positioned such that the caster portions 16 are positioned below the main body portion 11 . However, the suitcase 10 can assume other postures.

The main body part 11 is a box-like body for accommodating luggage, and is, for example, a substantially rectangular parallelepiped member. The handle portion 12 is a portion that is gripped when the suitcase 10 is lifted or transported along the floor surface. The handle portion 12 has two pole portions 14 and a grip portion 13 . Each pole portion 14 is, for example, a substantially quadrangular prism-shaped member, and is attached to the main body portion 11 so as to extend vertically. The grip portion 13 is, for example, a substantially cylindrical member, and is attached so as to extend over the upper ends of the two pole portions 14 . The grip portion 13 is provided with an operation portion 15 for operating a wheel lock system 100 provided on the caster portion 16, which will be described later. The handle portion 12 has two pole portions 14 extending upward from the upper surface of the body portion 11 (see column A in FIG. 1), and two pole portions 14 extending inside the body portion 11 or the body portion. It is configured to be switchable between a stored state (see column B in FIG. 1) stored in a storage space provided on the side surface of 11 .

The caster part 16 is attached to the bottom of the main body part 11 and has wheels 110 . The casters 16 support the main body 11 and smoothly move the suitcase 10 along the floor by rotating the wheels 110 . In this embodiment, caster portions 16 are provided at each of the four corners of the bottom portion of the main body portion 11 .

A wheel lock system 100 is also provided in the caster section 16 . The wheel lock system 100 is a system that allows or restricts the rotation of the wheels 110 of each caster part 16 in order to prevent unintended movement of the suitcase 10 and to adjust the movement speed of the suitcase 10. is. The wheel lock system 100 will now be described in detail.

A-2. Configuration of the wheel lock system 100:
2 to 10 are explanatory diagrams showing the configuration of the wheel lock system. 2 shows an external perspective configuration of the wheel lock system 100, and FIG. 3 shows an exploded perspective configuration thereof. 4 and 5 show the side configuration of the wheel lock system 100, FIG. 6 shows the cross-sectional (XZ cross section) configuration of the wheel lock system 100 at the position VI-VI in FIG. 4, and FIG. 5 shows a cross-sectional (YZ cross-sectional) configuration of the wheel lock system 100 at position VII-VII in FIG. 8 and 9 show an external or cross-sectional perspective configuration of a portion of the wheel lock system 100. FIG. 6, 8 and 9 show the state (locked state) in which the wheel lock system 100 restricts the rotation of the wheel 110, while FIG. 1 shows a cross-sectional (XZ cross-sectional) configuration of the wheel lock system 100 in an unlocked state).

The wheel lock system 100 includes a chassis 190, two wheels 110, a rotating shaft member 120, two bearings 150, a lock mechanism 160, a biasing member 105, an operation wire 106, and a turning mechanism 108. Prepare. Each member constituting the wheel lock system 100 is made of resin or metal, for example. At least some of the constituent members of the wheel lock system 100 also function as constituent members of the caster portion 16 .

The chassis 190 is a housing for supporting and/or housing each member that configures the wheel lock system 100 . The chassis 190 includes a substantially cylindrical horizontal portion 191 extending substantially horizontally, a substantially cylindrical vertical portion 192 extending substantially vertically, and a substantially cylindrical portion 192 provided at a position sandwiched between the horizontal portion 191 and the vertical portion 192 . and a connecting portion 193 having a rectangular parallelepiped shape. An internal space 194 communicating with each other is formed in each of the horizontal portion 191 , the vertical portion 192 and the connecting portion 193 of the chassis 190 .

The swivel mechanism 108 is a mechanism that has bearings and enables the caster part 16 to swivel with respect to the main body part 11 (FIG. 1) of the suitcase 10 . A lower end portion of the turning mechanism 108 is inserted into an internal space 194 of a vertical portion 192 of the chassis 190 . Also, the upper end portion of the turning mechanism 108 is screwed to the bottom portion of the body portion 11 of the suitcase 10 . Thus, the chassis 190 (caster section 16) is attached to the main body section 11 via the turning mechanism 108 so as to be horizontally turnable.

Each wheel 110 is a substantially disk-shaped member. Further, the rotating shaft member 120 has a substantially horizontally extending columnar axle 130 and a substantially horizontally extending substantially cylindrical tubular member 140 . Axle 130 is coaxial with tubular member 140 and is inserted into hollow portion 141 in a state that it cannot rotate relative to tubular member 140 . Therefore, the axle 130 and the tubular member 140 rotate together around the rotation axis. Two ends 131 along the extending direction of the axle 130 protrude from the cylindrical member 140, and the wheels 110 are attached to the ends 131 in a non-rotatable manner. Therefore, each wheel 110 rotates coaxially as the rotation shaft member 120 including the axle 130 rotates about the rotation axis. In addition, a wall portion 142 that protrudes in the outer peripheral direction is formed near the center in the extending direction of the outer peripheral surface 143 of the tubular member 140 . In this embodiment, the wall portion 142 is formed continuously over the entire circumference. In addition, the axle 130 and the tubular member 140 may be an integral member.

Each bearing 150 is a substantially disc-shaped member, and is housed and fixed in internal spaces 194 at both ends along the extending direction of the horizontal portion 191 of the chassis 190 . A through hole 151 is formed in each bearing 150 . One end of the axle 130 forming the rotary shaft member 120 is inserted through the through hole 151 of one bearing 150 , and the through hole 151 of the other bearing 150 is inserted into the through hole 151 of the axle forming the rotary shaft member 120 . The other end of 130 is inserted. Thereby, the axle 130 is rotatably supported by each bearing 150 . Since each bearing 150 is fixed to the chassis 190 as described above, it can be said that the rotating shaft member 120 is rotatably supported by the chassis 190 . Note that the bearing 150 and the chassis 190 may be an integral member.

The lock mechanism 160 operates between an unlocked state that allows rotation of the rotating shaft member 120 (that is, rotation of the wheels 110 attached to the rotating shaft member 120) and a locked state that restricts rotation of the rotating shaft member 120. , the state of the rotating shaft member 120 is switched. When the rotating shaft member 120 is in the unlocked state, the suitcase 10 can be smoothly moved along the floor surface, and when it is in the locked state, unintended movement of the suitcase 10 can be prevented.

The lock mechanism 160 has a rope 170 and a control member 180. Control member 180 is housed within interior space 194 of chassis 190 . Within the internal space 194 , the control member 180 is arranged above the rotating shaft member 120 .

The control member 180 has an arm 181 and a pulley 185. The arm 181 is an arm-shaped member, and is mounted on the chassis 190 so as to be swingable around the pin 101 by a pin 101 extending substantially horizontally and inserted through a through hole 183 formed near the center in the extending direction. attached to the

The pulley 185 is a substantially disk-shaped member. The pulley 185 is rotatable about it by means of a substantially horizontally extending pin 103 inserted through a through hole 186 formed near its center and a through hole 182 formed near one end of the arm 181 . It is attached to arm 181 . By swinging the arm 181 around the pin 101, the pulley 185 attached to the arm 181 is located at the separated position P1 separated from the rotary shaft member 120, and the pulley 185 is located at the separated position P1. The state of the pulley 185 is switched between the state of being positioned at the approach position P2 approaching the pulley 120 and the state of the pulley 185 . The pulley 185 is an example of a suspension in the claims.

The rope 170 is a long cord-like member. The rope 170 is wound around the outer peripheral surface 143 of the tubular member 140 that constitutes the rotary shaft member 120 for one or more turns. As shown in FIG. 7, each of the two ends 178 of the rope 170 is inserted into and fixed to a fixed space 196 formed in the horizontal portion 191 of the chassis 190 .

The rope 170 is suspended from a pulley 185 at a position near the center in the extending direction. When the rope 170 is virtually divided into two parts (a first rope part 171 and a second rope part 172) based on the position suspended by the pulley 185, the first rope part 171 and the second rope part 172 can be said to have one end fixed to the chassis 190 and the other end suspended from the pulley 185 . In this specification, the term "suspension" means to support the ends and/or parts other than the ends of the cord.

The first rope portion 171 is wound around one or more turns in a region of the outer peripheral surface 143 on one side with respect to the wall portion 142 , and the second rope portion 172 is wound around the wall portion of the outer peripheral surface 143 . It is wound one or more rounds in the region on the other side with respect to the portion 142 . The number of windings of the first rope portion 171 and the second rope portion 172 is more preferably 3 or more, and more preferably 5 or more. Due to the presence of the wall portion 142 , displacement of the first rope portion 171 and the second rope portion 172 along the axial direction of the tubular member 140 is suppressed.

The winding directions of the first rope portion 171 and the second rope portion 172 are opposite to each other. That is, as shown in FIG. 8, when viewed from the Y-axis negative direction side, the first rope portion 171 extends downward from a position suspended by the pulley 185, and then extends to the outer peripheral surface 143 of the tubular member 140. While being wound counterclockwise, the second rope portion 172 extends downward from the position where it is suspended on the pulley 185 and is then wound clockwise around the outer peripheral surface of the cylindrical member 140 .

In this embodiment, in order to prevent two adjacent portions of the rope 170 wound around the outer peripheral surface 143 from intersecting and being damaged, the outer peripheral surface 143 is spaced apart from the outer peripheral surface 143 by a predetermined distance. A substantially cylindrical cover member 148 is attached to cover the . The inner diameter of the hollow portion of the cover member 148 is larger than the outer diameter of the tubular member 140 (the outer diameter of the portion where the wall portion 142 is not formed) + the diameter of the rope 170 x 2, and the outer diameter of the tubular member 140. It is set to a value smaller than +the diameter of the rope 170×3. Therefore, the cover member 148 suppresses damage to the rope 170 caused by the crossing of the two portions adjacent to each other.

When the pulley 185 is positioned at the separated position P1 separated from the rotating shaft member 120, one end of each of the first rope portion 171 and the second rope portion 172 constituting the rope 170 is pulled upward (FIGS. 6 and 6). See Figure 8). Therefore, tension is generated in the first rope portion 171 and the second rope portion 172 , and each of the first rope portion 171 and the second rope portion 172 tightens the cylindrical member 140 . On the other hand, when the pulley 185 is positioned at the close position P2 where the pulley 185 is close to the rotating shaft member 120, one end of each of the first rope portion 171 and the second rope portion 172 is positioned at the separated position P1 when the pulley 185 is positioned at the separated position P1. lower (see FIG. 10). Therefore, tension is not generated in the first rope portion 171 and the second rope portion 172, so that they are loosened and the tubular member 140 is not tightened.

The biasing member 105 is composed of, for example, a coil spring, and one end thereof is fixed to the chassis 190 by a pin 102 . The other end of the biasing member 105 is inserted into a through hole 184 formed in the arm 181 of the control member 180 at a position opposite to the pulley 185 with respect to the pin 101 serving as the swing center. has been fixed. The biasing member 105 biases the arm 181 so that the pulley 185 is positioned at the separated position P1 away from the rotary shaft member 120. As shown in FIG.

The operation wire 106 is a long cord-like member, and one end of the operation wire 106 is a recess 188 provided in the arm 181 between the pin 101 as the swing center and the through hole 184 to which the biasing member 105 is fixed. It is fixed using the terminal member 107 while being inserted into the terminal member 107 . The operation wire 106 extends upward from the end portion fixed to the arm 181 through a through hole formed in the turning mechanism 108, passes through the inside of the pole portion 14 of the handle portion 12 and the grip portion 13, and reaches the grip portion. It reaches the operation part 15 provided in the part 13 (see FIG. 1). The operation unit 15 has movable units such as dials, levers, buttons, etc., which are operated by the user. Depending on the state of the movable portion, the operation portion 15 switches between a state in which the operation wire 106 is pulled and a state in which the operation wire 106 is not pulled. The operation wire 106 is an example of a force transmission member in the claims.

A-3. Operation of wheel lock system 100:
Next, the operation of the wheel lock system 100 of this embodiment will be described. When the operating portion 15 ( FIG. 1 ) is not pulling the operating wire 106 , no upward load acts on the connection point (recess 188 ) with the operating wire 106 in the arm 181 of the control member 180 . Therefore, at this time, as shown in FIGS. 6, 8, and 9, the arm 181 is moved by the biasing member 105 in a direction (shown in FIG. The arm 181 is urged to swing in the direction Da), and as a result, the arm 181 assumes a posture in which the pulley 185 is positioned at the separated position P1.

When the pulley 185 is positioned at the separated position P1, one end of each of the first rope portion 171 and the second rope portion 172 constituting the rope 170 suspended on the pulley 185 is pulled up. tension is generated in the rope portion 171 and the second rope portion 172 , and each of the first rope portion 171 and the second rope portion 172 tightens the cylindrical member 140 . Here, each of the first rope portion 171 and the second rope portion 172 is wound around the outer peripheral surface 143 of the cylindrical member 140 by one turn or more. Therefore, when the first rope portion 171 and the second rope portion 172 tighten the tubular member 140, a large frictional load is applied to the tubular member 140 by the first rope portion 171 and the second rope portion 172. , a large force that prevents the rotation of the tubular member 140 is generated. This results in a locked state in which the rotation of the rotating shaft member 120 including the cylindrical member 140 (that is, the rotation of the wheel 110 attached to the rotating shaft member 120) is restricted. According to Euler's belt theory, the friction load when a rope-like object such as the rope 170 is wound around a shaft member such as the rotary shaft member 120 is expressed by the following formula (1).
T ₁ = T ₀ e ^μθ (1)
however,
T ₁ : force required to be applied to the other end of the cord-like object in order to cause the cord-like object to slide when one end of the cord-like object is pulled with a force of T ₀ μ: coefficient of friction θ: rope contact angle or winding angle

According to the above formula (1), for example, when a rope is wound around the shaft member once (θ = 2π) and the coefficient of friction μ = 0.3, T ₁ = 6.6T ₀ , which is about 7 times It is possible to demonstrate the rotation control force of the object. Further, when the number of turns of the cord-like material is changed to 3 (θ=6π), T ₁ =285.9T ₀ , and a rotation restricting force of about 286 times can be exerted.

On the other hand, when the operating portion 15 is in a state of pulling the operating wire 106 , an upward load acts on the connection point (recess 188 ) with the operating wire 106 in the arm 181 of the control member 180 . Therefore, at this time, as shown in FIG. 10, the arm 181 moves in a direction (see FIG. 9) in which the pulley 185 approaches the rotating shaft member 120 with the pin 101 as the center, against the biasing force of the biasing member 105. As a result, the arm 181 assumes a posture in which the pulley 185 is positioned at the approach position P2.

When the pulley 185 is positioned at the approach position P2, one end of each of the first rope portion 171 and the second rope portion 172 is lowered. There is no tension on the Therefore, the first rope portion 171 and the second rope portion 172 are loosened, and the cylindrical member 140 is not tightened. As a result, an unlocked state in which rotation of the rotating shaft member 120 including the cylindrical member 140 (that is, rotation of the wheels 110 attached to the rotating shaft member 120) is permitted is achieved.

As described above, in the wheel lock system 100 provided in the suitcase 10 of the present embodiment, the state of the lock mechanism 160 is changed to allow the rotation of the rotating shaft member 120 (and thus the wheels 110) by operating the operation unit 15. It is possible to switch between the unlocked state and the locked state that restricts the rotation of the rotating shaft member 120, thereby allowing the suitcase 10 to move smoothly along the floor surface. can be switched between states that prevent unintended movement of the

A-4. Effect of this embodiment:
As described above, in the wheel lock system 100 of the present embodiment, the state of the control member 180 constituting the lock mechanism 160 is divided into the state where the pulley 185 is located at the separated position P1 where the pulley 185 is separated from the rotation shaft member 120, and the state where the pulley 185 is positioned at an approach position P2 closer to the rotary shaft member 120 than the separated position P1, and a relatively simple configuration of switching between the unlocked state allowing the rotation of the rotary shaft member 120 and the rotary shaft member Switching to and from a locked state that restricts the rotation of 120 can be realized. Further, in the wheel lock system 100 of the present embodiment, the locked state is realized by tightening the rotating shaft member 120 with the rope 170 wound around the rotating shaft member 120 by one or more turns. The rotation of the rotating shaft member 120 can be reliably restricted in the locked state without the need to pull any member. Further, in the wheel lock system 100 of the present embodiment, the rope 170, which is a relatively small-diameter member, is used to lock the rotating shaft member 120. Therefore, it can be applied to lock the relatively small-diameter wheel 110 as well. It is possible to realize the miniaturization of the device. As described above, according to the wheel lock system 100 of the present embodiment, the unlocked state in which the rotation of the rotating shaft member 120 is permitted and the locked state in which the rotation of the rotating shaft member 120 is restricted can be achieved by a relatively simple configuration. The switching can be realized, the rotation of the rotating shaft member 120 can be reliably restricted in the locked state without requiring a large force, and the size of the device can be reduced.

In the wheel lock system 100 of the present embodiment, the rope 170 includes a first rope portion 171 wound around the rotating shaft member 120 for one or more turns, and a winding direction of the first rope portion 171 around the rotating shaft member 120. and a second rope portion 172 wound one or more turns in the direction opposite to the direction of the pulley 185 of the control member 180, the end of the first rope portion 171 and the end of the second rope portion Suspending the part. Therefore, according to the wheel lock system 100 of the present embodiment, the first rope portion 171 rotates the rotary shaft member 120 in one direction (for example, rotates the suitcase 10 forward) to the unlocked state. Switching between the locked state and the locked state can be realized, and the rotation of the rotating shaft member 120 in the other direction (for example, the rotation in the direction of retracting the suitcase 10) by the second rope portion 172 can be switched between the unlocked state and the locked state. Switching between states can be realized. Therefore, according to the wheel lock system 100 of the present embodiment, the rotation of the rotating shaft member 120 (and thus the wheel 110) in both directions can be reliably restricted in the locked state.

The wheel lock system 100 of this embodiment further includes a biasing member 105 and an operation wire 106. The biasing member 105 biases the control member 180 so that the pulley 185 of the control member 180 is positioned at the separated position P1. The operation wire 106 transmits force to the control member 180 against the biasing force of the biasing member 105 so that the pulley 185 of the control member 180 is positioned at the approach position P2. Therefore, according to the wheel lock system 100 of the present embodiment, the rotating shaft member 120 (and thus the wheel 110) is normally locked, and the locked state is changed to the unlocked state by transmitting force from the operation wire 106 to the control member 180. , and the operability of the wheel lock system 100 can be improved.

In the wheel lock system 100 of the present embodiment, the control member 180 swings about a predetermined axis (the pin 101) so that the pulley 185 is positioned at the distant position P1 and the pulley 185 is positioned at the close position P2. The biasing member 105 biases the control member 180 to swing in one direction about the axis, and the operation wire 106 moves the control member 180 about the axis in the other direction. Therefore, according to the wheel lock system 100 of this embodiment, switching between the locked state and the unlocked state can be achieved with a relatively simple and space-saving configuration.

B. Variant:
The configuration of the suitcase 10 and the configuration of the wheel lock system 100 provided in the suitcase 10 in the above embodiment are merely examples, and various modifications are possible. That is, the technology disclosed in this specification can be modified in various forms without departing from the scope of the invention.

11 and 12 are cross-sectional views of a modified wheel lock system 100a. FIG. 11 shows a state in which rotation of the wheels is allowed, and FIG. 12 shows a state in which rotation of the wheels is restricted. In the wheel lock system 100a of the modification, contrary to the above-described embodiment, the lock mechanism 160 is normally in the unlocked state, and the lock mechanism 160 shifts to the locked state as the operation unit 15 is operated. That is, in the wheel lock system 100a of the modified example, the positions of the pin 101 that is the swing center of the arm 181, the recess 188 that is the fixing position of the operation wire 106, and the through hole 184 that is the fixing position of the urging member 105 are The relationship is opposite to the above embodiment. Therefore, normally, as shown in FIG. 11, the arm 181 is urged by the urging member 105 to swing around the pin 101 in such a direction that the pulley 185 approaches the rotary shaft member 120. As a result, the arm 181 assumes a posture in which the pulley 185 is positioned at the approach position P2, and an unlocked state in which the rotation of the rotating shaft member 120 is permitted. On the other hand, when the operating portion 15 is in a state of pulling the operating wire 106 , an upward load acts on the fixing position (recess 188 ) of the operating wire 106 on the arm 181 . Therefore, as shown in FIG. 12, the arm 181 swings about the pin 101 against the biasing force of the biasing member 105 in such a direction that the pulley 185 is separated from the rotating shaft member 120. As a result, , the arm 181 assumes a posture in which the pulley 185 is positioned at the separated position P1, and the rotation of the rotating shaft member 120 is restricted to a locked state.

In the above embodiment, four caster parts 16 are attached to the suitcase 10, but the number of caster parts 16 attached to the suitcase 10 may be three or less, or five or more. good too. Further, the number of wheels 110 included in each caster portion 16 may be one, or may be three or more.

In the above embodiment, the operating portion 15 is installed on the handle portion 12, but the operating portion 15 may be installed at another position. The installation position of the operation wire 106 can also be changed according to the installation position of the operation unit 15 . Also, a member other than the operation wire 106 may be used as the force transmission member.

In the above embodiment, one rope 170 is virtually separated into the first rope portion 171 and the second rope portion 172, but the physically separated two ropes are separated into the first rope portion. 171 and the second rope portion 172. In addition, both the first rope portion 171 and the second rope portion 172 of the rope 170 are suspended using one arm 181, but each of the first rope portion 171 and the second rope portion 172 An arm 181 for suspension may be separately prepared. Also, one end 178 of the rope 170 is fixed to the arm 181, and after the rope 170 extends from the fixed position toward the tubular member 140 and is wound around the outer peripheral surface 143 of the tubular member 140, the arm A configuration in which the other end 178 of the rope 170 is fixed to the arm 181 may be adopted.

In the above embodiment, the rope 170 includes the first rope portion 171 wound around the rotating shaft member 120 and the second rope portion 172 wound in the opposite direction. , the rope 170 may include only a portion wound in one winding direction. Even with such a configuration, the rotation of the rotating shaft member 120 can be reliably restricted in at least one rotation direction in the locked state.

In the above-described embodiment, the locked state of the lock mechanism 160 is a state in which the rotation of the rotating shaft member 120 is completely prevented. Although the locked state restricts the rotation of the rotating shaft member 120, it does not completely prevent it. A state, that is, a state in which the rotation speed of the rotating shaft member 120 is reduced may be used. Such a configuration can be realized by adjusting the tension generated in the rope 170 in the locked state, or by adjusting the number of turns of the rope 170 or the coefficient of friction between the rope 170 and the tubular member 140. . With such a configuration, the wheel lock system 100 can also be used as a braking device.

In the above embodiment, an example in which the wheel lock system 100 is applied to the suitcase 10 has been described, but the wheel lock system 100 disclosed in this specification can also be applied to other carriers (for example, trolleys, stretchers, etc.). equally applicable.

10: Suitcase 11: Body 12: Handle 13: Grip 14: Pole 15: Operation 16: Caster 100: Wheel lock system 100a: Wheel lock system (modification)
101: Pin 102: Pin 103: Pin 105: Biasing member 106: Operation wire 107: Terminal member 108: Turning mechanism 110: Wheel 120: Rotating shaft member 130: Axle 131: End portion 140: Cylindrical member 141: Hollow portion 142: wall portion 143: outer peripheral surface 148: cover member 150: bearing 151: through hole 160: lock mechanism 170: rope 171: first rope portion 172: second rope portion 178: end portion 180: control member 181: Arm 182: Through hole 183: Through hole 184: Through hole 185: Pulley 186: Through hole 188: Recessed portion 190: Chassis 191: Horizontal portion 192: Vertical portion 193: Connection portion 194: Internal space 196: Fixed space

Claims

A wheel lock system,
wheels and
a rotating shaft member attached to the wheel;
a bearing that rotatably supports the rotating shaft member;
a locking mechanism that switches the state of the rotating shaft member between an unlocked state that permits rotation of the rotating shaft member and a locked state that restricts rotation of the rotating shaft member;
with
The locking mechanism is
a rope wound around the rotating shaft member one or more times;
A state in which the suspension includes a suspension portion on which the rope is suspended, and the suspension portion is positioned at a separated position separated from the rotating shaft member; a control member for switching the state of the suspension between a state in which the suspension is positioned;
has
The lock mechanism tightens the rotating shaft member with the rope to be in the locked state when the suspension portion is positioned at the separated position, and the rope is locked when the suspension portion is positioned at the close position. A wheel locking system configured to loosen into said unlocked condition.
A wheel locking system according to claim 1, comprising:
The rope of the locking mechanism is
a first rope portion wound around the rotating shaft member one or more times;
a second rope portion wound around the rotating shaft member one or more times in a direction opposite to the winding direction of the first rope portion;
including
The wheel locking system, wherein the control member suspends an end of the first rope section and an end of the second rope section at the suspension.
3. A wheel locking system according to claim 1 or claim 2, further comprising:
a biasing member biasing the control member such that the suspension portion of the control member is positioned at the spaced position or the close position;
a force transmission member that transmits force to the control member so that the suspension portion of the control member is positioned at the approach position or the separation position against the biasing force of the biasing member;
with a wheel lock system.
A wheel locking system according to claim 3, comprising:
The control member is configured to switch between a state in which the suspension portion is positioned at the distant position and a state in which the suspension portion is positioned at the close position by swinging about a predetermined axis. has been
the biasing member biases the control member so as to swing in one direction about the predetermined axis;
The wheel lock system, wherein the force transmission member transmits a force to the control member so as to swing the control member about the predetermined axis in the other direction.
a wheel locking system according to any one of claims 1 to 4;
a main body with the wheel lock system attached to the bottom;
a carrier.