JP2010120634A - Caster device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a caster device continuously changing the operation mode of a caster, which is mounted to a moving body such as a medical equipment or a movable bed. <P>SOLUTION: The caster device includes a crankshaft; a rotary member; a pressing member; and a connecting rod. The crankshaft is coaxially linked to a reciprocally rotating cam element of the caster. The rotary member is rotatably mounted on the moving body. The rotary member includes a plurality of circumferentially separated pins. The pressing member is mounted on the moving body so as to resiliently move up and down. When the pressing member moves down, it contacts these pins and rotates the rotary member. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a caster device attached to a moving body such as a medical device or a mobile bed.

  A plurality of casters are attached to an apparatus or a cart for carrying an article. Generally, casters include a base that is mounted on the underside of the device or cart and a wheel that is coupled to the base through a wheel arm. Such casters can be classified into non-rotating casters in which the wheel arm does not rotate with respect to the base and rotating casters in which the wheel arm rotates with respect to the base. The user can rotate the wheel arm to change the direction of movement of the device or cart to which the rotary caster is attached. The casters can include a locking device for selectively locking and unlocking the wheel or wheel arm to secure the device or cart in any location.

  As an example of the device or cart, a mobile bed or a medical device used in a medical facility needs to be moved in the medical facility or stably fixed in an arbitrary place. For this purpose, the above-mentioned caster is attached to the medical device or the mobile bed. However, in order to fix or move the position of the medical device or the mobile bed, the locking device provided in each caster must be operated, which is bothersome when moving and fixing. In particular, in an emergency (emergency) situation, there is a problem that appropriate measures are delayed due to such annoyance. Moreover, when the caster provided with the locking device according to the operation mode of the caster is used, there is a problem that the user confuses each operation device.

  US Pat. No. 5,774,936

  The present invention is for solving the above-described problems, and an object of the present invention is to provide a caster device that is mounted on a moving body and can continuously switch the operation mode of the caster.

  Various embodiments of caster devices mounted on a mobile body are provided. The caster device includes a caster that is mounted on a moving body with a cam element that rotates in a reciprocating manner, a crankshaft that is coupled to the cam element, and is rotatably mounted on the moving body and spaced apart along a circumferential direction. A rotating member having a plurality of pins, a pressing member that is mounted on the movable body so as to move up and down, and that rotates the rotating member in contact with the pins, and connects the rotating member and the crankshaft. A connecting rod, and the rotation of the rotating member due to the movement of the pressing member is switched to the reciprocating rotation of the cam element by the connecting rod and the crankshaft.

  The pressing member includes a pressing plate, and the pressing plate has a first contact surface that contacts the pin when the pressing member moves downward and a second contact surface that contacts the pin when the pressing member moves upward. And have.

  The pressing plate includes a vertical portion and a horizontal portion extending from the vertical portion.

  The second contact surface includes the horizontal portion and a tapered surface.

  The pressing member further includes a spring that biases the pressing plate toward the rotating member.

  The pressing member includes a rotation bar that is rotatably coupled to a rotation shaft of the rotation member at one end, and the rotation bar has a first contact surface that contacts the pin when rotating downward and an upper rotation. And a second contact surface that contacts the pin during movement.

  The caster device further includes a spring disposed between the movable body and the rotating bar to urge the rotating bar upward.

  The pin is removably attached to the rotating member, and the pin has a tapered surface that contacts the pressing member at a tip thereof.

  The pressing member includes a pedal plate.

  The caster includes a push rod that moves up and down to different heights in a plurality of operation modes by rotation of the cam element.

  According to the caster device of the present invention, the user can change the operation mode of the caster continuously or intermittently by moving or rotating the pressing member in one direction. Therefore, the user can change the operation mode of the caster in a short time without confusion with the operation mode. In addition, since the operation mode is switched in one cycle by one rotation of the rotating member, the user can easily switch the operation mode of the caster.

It is a perspective view which shows the caster apparatus in 1st Example of this invention. It is a right view which shows the caster apparatus of FIG. It is a left view which shows the caster apparatus of FIG. It is sectional drawing which shows the caster of FIG. Fig. 5 shows cam elements and operating modes of the caster of Fig. 4; It is a partial expansion perspective view of the caster apparatus of FIG. It is the schematic which illustrates the coupling | bonding of a pedal plate and a press board. It is sectional drawing which shows the coupling | bonding of a rotating member and a pin. It is an expansion perspective view which shows a contact with a press board and a pin. It is an expansion perspective view which shows a contact with a press board and a pin. It is an expansion perspective view which shows a contact with a press board and a pin. It is a perspective view which shows the caster apparatus in the 2nd Example of this invention. It is a perspective view which shows the caster apparatus in the 3rd Example of this invention.

  Embodiments of a caster device according to the present invention will be described below with reference to the accompanying drawings.

  FIG. 1 is a perspective view showing a caster device according to a first embodiment of the present invention. 2 and 3 are a right side view and a left side view of the caster device of FIG. 1, respectively. FIG. 4 is a cross-sectional view of a caster employed in the present invention, and FIG. 5 shows a cam element and an operation mode of the caster of FIG.

  1 to 5, the caster device 100 according to the first embodiment of the present invention includes a crankshaft 110, a pressing member 120, a rotating member 130, a connecting rod 140, and a caster 150.

  The caster device 100 is mounted on a moving body (not shown) to support and move the moving body. The caster device 100 reciprocates the cam element 155 of the caster 150 to set the caster 150 to one of a plurality of operation modes. The mobile body to which the caster device 100 is attached can include a medical device such as a mobile bed or an ultrasonic diagnostic apparatus. The mobile body may include any mobile body to which casters are attached, such as a cart configured to carry articles.

  As an example, the crankshaft 110 includes a connecting shaft 111 having one end connected or connected to the cam element 155 of the caster 150 coaxially, a crank arm 112 having one end connected to the other end of the connecting shaft 111, A crankpin 113 coupled to the other end and coupled to the connecting rod 140 is provided. The connecting rod 140 is rotatably connected to the crank pin 113 at one end and is rotatably connected to the rotating member 130 at the other end.

  The pressing member 120 is attached to the moving body so as to be movable in the vertical direction. In this embodiment, the pressing member 120 includes a pedal plate 121. Further, the pressing member 120 includes a guide rod 123 and a compression spring 124, and can move elastically in the vertical direction. One guide rod 123 may be disposed at the center of the pedal plate 121 or two at the front and rear of the pedal plate 121.

  The moving body is provided with a bracket 11 for guiding and supporting the guide rod 123. One end of the guide rod 123 is fixed to the pedal plate 121, and the other end is movably coupled to the bracket 11. A compression spring 124 is arranged around the guide rod 123 between the pedal plate 121 and the bracket 11. When the user presses the pressing member 120 downward, for example, when the pedal plate 121 is stepped on, the guide rod 123 moves downward together with the pedal plate 121 while the compression spring 124 is compressed. The guide rod 123 may be provided with a stopper (not shown) at the other end so as not to be separated from the bracket 11.

  The caster 150 is attached to the lower part of the moving body. 4 and 5, the caster 150 includes a wheel 151, a wheel arm 152 that supports the wheel 151, and a wheel base that is coupled to the wheel arm 152 so as to rotate relative to the wheel base 152. 153, an actuating part 154 fixed to the wheel base 153, a cam element 155 that is mounted on the actuating part 154 so as to be reciprocally rotatable and for switching the operating mode, and the vertical direction according to the operating mode of the cam element 155 And a push rod 156 that moves to the right.

  A bearing 157 is disposed between the wheel arm 152 and the wheel base 153. A rubber pad 156a is attached to the lower end of the push rod 156 by a fastening member 156b, and a contact portion 156c that contacts the peripheral surface of the cam element 155 is provided at the upper end of the push rod 156. A compression spring 156d is disposed between the contact portion 156c and the fastening member 156b, and constantly urges the contact portion 156c toward the cam element 155 side. A coupling piece 156e is integrally attached to the push rod 156 above the rubber pad 156a, and a recess 152a to which the coupling piece 156e is selectively coupled is formed on the wheel arm 152. .

  As shown in FIG. 5, the cam element 155 has first to third cam surfaces 155a, 155b, and 155c having different radial lengths from the rotation shaft (A) on the circumferential surface thereof. Since the contact portion 156c of the push rod 156 contacts the cam surfaces 155a, 155b, and 155c of the cam element 155 under the biasing force of the compression spring 156d, the reciprocating rotation about the rotation axis (A) of the cam element 155 The push rod 156 can move elastically in the vertical direction. For the configuration of the caster 150 described above, the above prior art document can be referred to. In the example shown in FIG. 5, the first cam surface 155a and the third cam surface 155c have a recessed shape, and the second cam surface 155b has a flat shape. However, the number of cam surfaces of the cam element 155 and the profile of each cam surface can be variously designed according to the operation mode of the caster 150.

  The caster 150 described above can operate in the first to third modes. In the first mode, the contact portion 156c is fitted to the first cam surface 155a of the cam element 155, and the coupling piece 156e and the recess 152a are separated. Therefore, the wheel arm 152 of the caster 150 can be rotated to change the direction, and the wheel 151 can be rotated.

  In the second mode, the contact portion 156c is in contact with the second cam surface 155b of the cam element 155, the push rod 156 moves downward, and the rubber pad 156a is in pressure contact with the peripheral surface of the wheel 151. . Therefore, the wheel 151 of the caster 150 cannot rotate.

  In the third mode, the contact portion 156c is fitted to the third cam surface 155c of the cam element 155, and the coupling piece 156e and the recess 152a are fitted to each other. Therefore, the wheel arm 152 of the caster 150 cannot rotate, and the wheel 151 can rotate.

  FIG. 6 is a partially enlarged perspective view showing the caster device of FIG. 1, and FIG. 7 is a schematic view illustrating the coupling between the pressing plate and the pedal.

  The pressing member 120 further includes a pressing plate 122 for executing rotation of the rotating member 130 by moving downward. In this embodiment, the pressing plate 122 is attached to the pedal plate 121 and is movable in the vertical direction together with the pedal plate 121. In the illustrated example, the pressing plate 122 includes a vertical portion 122a attached to the pedal plate 121 at one end and a horizontal portion 122b extending from the vertical portion 122a.

  Referring to FIG. 6, the pressing plate 122 includes a first contact surface 122 c and a second contact surface 122 d that are in contact with the pins 131, 132, 133, and 134 of the rotating member 130. The first contact surface 122c contacts the pins 131, 132, 133, and 134 when the pressing member 120 moves downward, and the second contact surface 122d contacts the pins 131, 132, 133, and 134 when the pressing member 120 moves upward. To do. In this embodiment, the first contact surface 122c constitutes the lower end surface of the horizontal portion 122b. The first contact surface 122c is in contact with the pins 131, 132, 133, and 134, and moves the pins 131, 132, 133, and 134 downward. The second contact surface 122d includes an upper end surface and a tapered surface.

  The pressing plate 122 is attached to the pedal plate 121 so as to be rotatable with respect to the rotating member 130 while being urged toward the rotating member 130 side. For example, as shown in FIG. 7, the vertical portion 122 a of the pressing plate 122 is coupled to the support bracket 125 attached to the lower side of the pedal plate 121 through the rotation shaft 127. Between the vertical portion 122a and the support bracket 125, a tension spring 126 that urges the vertical portion 122a toward the rotating member 130 is interposed. Therefore, the pressing plate 122 contacts one surface of the rotating member 130 (the surface from which the pins 131, 132, 133, 134 protrude) under the biasing force of the tension spring 126, and can rotate with respect to the pedal plate 121. it can.

  The second contact surface 122d of the pressing plate 122 is inclined at a predetermined angle so that the horizontal portion 122b of the pressing plate 122 can easily exceed the pins 131, 132, 133, and 134. When the horizontal portion 122b of the pressing plate 122 exceeds the pins 131, 132, 133, and 134 (that is, when the horizontal portion 122b passes the pins 131, 132, 133, and 134 from the bottom to the top), the pressing plate 122 is a rotating member. You may rotate from 130. After the horizontal portion 122 b of the pressing plate 122 exceeds the pins 131, 132, 133, 134, the pressing plate 122 can be returned to its initial non-rotated position (position that contacts the rotating member 130) by the tension spring 126. .

  FIG. 8 is a cross-sectional view showing the coupling between the rotating member and the pin. 9 to 11 are enlarged perspective views showing contact between the pressing plate and the pins.

  In this embodiment, the rotating member 130 is provided with first to fourth pins 131, 132, 133, 134, and the first to fourth pins 131, 132, 133, 134 are rotating shafts 130 a of the rotating member 130. Are spaced apart from each other by 90 °.

  The pins 131, 132, 133, and 134 may be formed integrally with the rotating member 130, and may be removably attached to the rotating member 130. An example of the latter is illustrated in FIG. Referring to FIG. 8, as an example of the coupling between the rotating member 130 and the pin 131, the pin 131 is inserted and mounted in a hole formed in the rotating member 130. The pin 131 has a tapered surface 131a that makes a complementary contact with the second contact surface 122d of the horizontal portion 122b at the protruding tip. The pin 131 includes a guide part 131b, a stopper 131c, and a compression spring 131d. In order to maintain the tapered surface 131a of the pin 131 in a predetermined direction, the guide part 131b and the hole may have a polygonal cross section.

  When the pin 131 is pressed by the second contact surface 122d of the pressing plate 122, the pin 131 moves backward into the rotating member 130 while compressing the compression spring 131d (see FIGS. 10 and 11). When the pressing plate 122 passes through the pin 131 and the pin 131 is released from the pressing state, the pin 131 returns to the initial position by the restoring force of the compression spring 131d. The stopper 131 c prevents the pin 131 from being detached from the rotating member 130. The pins 132, 133, and 134 have the same configuration as the pin 131.

  1 to 3, the rotating member 130 may be a circular plate member or a circular disk member. The rotating member 130 has pins 131, 132, 133, and 134 projecting from one surface thereof, and is rotatably attached to the moving body. In this embodiment, the rotating member 130 is rotatably mounted on the moving body by a rotating shaft 130a. The rotating member 130 is coupled to the rotating shaft 130a by a one-way bearing and can be rotated in one direction. When the pressing plate 122 moves one of the pins 131, 132, 133, and 134 downward, one of the operation modes of the caster 150 is changed to a different operation mode due to the interaction of the rotating member 130, the connecting rod 140, and the crankshaft 110. Can be switched.

  One end of the connecting rod 140 is rotatably connected to the crank pin 113, and the other end is rotatably connected to the other surface of the rotating member 130 by a joint member 141. The joint member 141 may include a pin joint, a rivet joint, or the like. Referring to FIG. 3 for the connecting position of the other end of the connecting rod 140, for example, when the second mode of the caster 150 is set to the initial mode, the connecting position is the origin of the center of the rotating shaft 130a of the rotating member 130. Defined along the positive X-axis in the XY coordinate system. As another example, when the first mode of the caster 150 is set to the initial mode, the coupling position is determined along the positive Y axis in the XY coordinate system.

If the rotating member 130 rotates once, the other end of the connecting rod 140 performs a circular motion. At this time, one end of the connecting rod 140 is centered on the connecting shaft 111 with the shortest distance between the crank pin 113 and a straight line extending from the connecting shaft 111 parallel to the crank pin 113 as the radius, and the center angle is an angle ( It reciprocates along an arc path that is θ ₁ + θ ₂ ) (see FIG. 5). By reciprocating rotation of one end of the connecting rod 140, the crank pin 113 reciprocates within an angle (θ ₁ + θ ₂ ) range. Eventually, the connecting shaft 111 and the cam element 155 of the caster 150 reciprocate within an angle (θ ₁ + θ ₂ ) range.

The crank arm 112 in the second mode forms a _first angle (θ ₁ ) with the crank arm 112 in the first mode, and the crank arm 112 in the third mode differs from the crank arm 112 in the first mode. An angle (θ ₂ ) of ₂ is formed (see FIG. 5). The first and second angles (θ ₁ , θ ₂ ) are values determined when the caster 150 is designed.

  In the caster device 100 of the first embodiment described above, the caster 150 operates in three modes, and four pins 131, 132, 133, 134 are arranged on the rotating member 130 at 90 ° intervals so as to correspond to this. ing. However, the present invention is not limited to such a mode-pin configuration. For example, if the cam element is configured such that the caster 150 operates in two or four modes, it will be appreciated that the number of pins can be two or six to allow switching between modes. Will.

  Hereinafter, an operation example of the caster device 100 of this embodiment will be described. In this embodiment, the caster 150 is initially set to the first mode. While the other end of the connecting rod 140 makes one rotation, the caster 150 changes from the first mode to the second mode, from the second mode to the first mode, from the first mode to the third mode, The caster device 100 is configured so that the first mode is changed to the first mode again. In relation to the description of the following operation example, the direction in which the rotating member 130 is rotated by the pressing plate 122 is the clockwise direction (hereinafter, “clockwise” means when the caster device 100 is viewed from the right side (FIG. 2). ) Clockwise direction.). In addition, the direction in which one end of the connecting rod 140 and the crank pin 113 are moved toward the rotating member 130 is the first direction, and the opposite direction is the second direction.

In the first mode, the wheel 151 can be rotated and the caster 150 can be turned. In the first mode, the other end of the connecting rod 140 is positioned directly above the rotation shaft 130a of the rotation member 130 (on the positive Y axis in FIG. 3). When the user presses the pressing member 120 downward, the horizontal portion 122b of the pressing plate 122 of the pressing member 120 comes into contact with the first pin 131 and rotates the first pin 131 and the rotating member 130 in the clockwise direction. If the rotating member 130 rotates about 90 °, the other end of the connecting rod 140 coupled to the other surface of the rotating member 130 rotates about 90 ° in the clockwise direction. Further, the crank pin 113 attached to one end of the connecting rod 140 to move in the range of the first angle (theta ₁₎ in the first direction, the connecting shaft 111 is a first angle (theta ₁₎ by reaction Rotate clockwise. Accordingly, the cam element 155 coupled to the connecting shaft 111 rotates counterclockwise at the first angle (θ ₁ ), the contact portion 156 contacts the second cam surface 155b, and the push rod 156 moves downward. The rubber pad 156a comes into contact with the wheel 151 by moving. As a result, the caster 150 enters the second mode.

  If the user releases the pressing of the pressing member 120 after the mode switching, the horizontal portion 122b of the pressing plate 122 moves upward by the restoring force of the compression spring 124. At this time, if the second contact surface 122d formed on the horizontal portion 122b contacts the tapered surface 131a formed on the first pin 131, the pedal plate is acted on by the action of the second contact surface 122d and the tapered surface 131a. A pressing plate 122 that is rotatably coupled to 121 rotates from one surface of the rotating member 130 (see FIG. 9). Therefore, the horizontal portion 122 b of the pressing plate 122 is placed above the second pin 132 in the rotating member 130 beyond the first pin 131.

  When the pin is configured to be retractable in the rotating member 130, the first pin 131 is retracted inside the rotating member 130 (see FIG. 10), and the horizontal portion 122 b of the pressing plate 122 exceeds the first pin 131. (Refer to FIG. 11) The rotary member 130 may be placed above the second pin 132.

In the second mode switched from the first mode, when the user presses the pressing member 120 downward, the other end of the connecting rod 140 is further rotated at about 90 ° in the clockwise direction, similar to the operation mechanism described above. It moves and is located directly below the rotating shaft 130a of the rotating member 130 (on the negative Y axis in FIG. 3). If the other end of the connecting rod 140 is rotated, one end of the connecting rod 140 and the crank pin 113 are moved in the second direction within a range of a _first angle (θ ₁ ) to move the connecting shaft 111 and the cam element 155. Rotate clockwise. Accordingly, the contact portion 156c moves from the second cam surface 155b of the cam element 155 and fits to the first cam surface 155a, the push rod 156 moves upward, and the rubber pad 156a is separated from the wheel 151. As a result, the caster 150 returns to the first mode.

In the first mode switched from the second mode, when the user operates the pressing member 120, the other end of the connecting rod 140 rotates about 90 ° in the clockwise direction. Then, as the other end of the connecting rod 140 rotates, one end of the connecting rod 140 and the crank pin 113 move in the second direction within a range of the second angle (θ ₂ ), and the connecting shaft 111, the cam element 155, Rotate clockwise. Accordingly, the push rod 156 moves upward while the contact portion 156c contacts the third cam surface 155c from the first cam surface 155a of the cam element 155, and the coupling piece 156e is fitted into the recess 152a. As a result, the caster 150 enters the third mode.

In the third mode switched from the first mode, when the user operates the pressing member 120, the other end of the connecting rod 140 further rotates about 90 ° in the clockwise direction. Then, as the other end of the connecting rod 140 rotates, one end of the connecting rod 140 and the crank pin 113 move in the first direction within a range of the second angle (θ ₂ ), and the connecting shaft 111 and the cam element 155 are moved. And rotate counterclockwise. Accordingly, the contact portion 156c is fitted from the third cam surface 155c of the cam element 155 to the first cam surface 155a, and the push rod 156 moves downward to separate the coupling piece 156e and the recess 152a. As a result, the caster 150 returns to the initial first mode.

  FIG. 12 is a perspective view of a caster device according to the second embodiment of the present invention. Since the caster device 200 of this embodiment is similar to the caster device 100 of the first embodiment except for the mounting structure of the pressing member, the description of the same components is omitted.

  Referring to FIG. 12, a caster apparatus 200 according to the second embodiment of the present invention includes a pressing member 220 that is hingedly coupled to a moving body (not shown) by a hinge shaft 228. Specifically, the pressing member 220 includes a pedal plate 221 that is hinge-coupled to the moving body by the hinge shaft 228, and is rotatable about the hinge shaft 228. The pressing member 220 includes a compression spring 224 and a guide rod 223, and can be elastically rotated about the hinge shaft 228.

  In the first embodiment, one end of the guide rod 123 is fixed to the pressing member 120 (see FIG. 2), but in this embodiment, one end of the guide rod 223 is connected to the pressing member 220 through a hinge (not shown). It is connected so that it can rotate. The other end of the guide rod 223 is movably coupled to the bracket 11 of the moving body. The compression spring 224 is disposed around the guide rod 223 between the pressing member 220 and the bracket 11. When the user rotates the pressing member 220 downward, the guide rod 223 rotates while the compression spring 224 compresses. If the user releases the rotation of the pressing member 220 in this state, the pressing member 220 is rotated upward by the restoring force of the compression spring 224. A stopper (not shown) is provided at the other end of the guide rod 223 in order to prevent detachment from the bracket 11.

  FIG. 13 is a perspective view of a caster device according to a third embodiment of the present invention. Since the caster device 300 of this embodiment is similar to the caster device 100 of the first embodiment except for the structure of the pressing member, the description of the same components is omitted.

  Referring to FIG. 13, a caster device 300 according to the third embodiment of the present invention has a rotating bar 322 that is rotatably attached to a rotating shaft 130 a at one end and is coupled to a pedal plate 321 at the other end. A pressing member 320 is provided.

  The rotation bar 322 includes a first contact surface 322b that contacts the pins 131, 132, 133, and 134 when rotated downward, and a second contact that contacts the pins 131, 132, 133, and 134 when rotated upward. A surface 322a. The first contact surface 322 b of the rotation bar 322 constitutes the lower end surface of the rotation bar 322, and the second contact surface 322 a constitutes the upper end surface of the rotation bar 322. The second contact surface 322a can be provided with a tapered surface inclined toward the rotating member 130 as in the case of the second contact surface 122d in the first embodiment (see FIG. 6).

  The caster device 300 according to this embodiment may further include a torsion spring (not shown) that is connected to the moving body and the rotation bar 322 and biases the rotation bar 322 upward. The rotation bar 322 rotates clockwise in FIG. 13 and compresses the torsion spring. Due to the restoring force of the torsion spring, the rotating bar 322 can rotate counterclockwise and return to the initial position. The torsion spring can be provided between the rotating bar 322 and the rotating shaft 130a by a known method. For example, one end of the torsion spring can be fixed to the rotating bar 322 and the other end can be fixed to the rotating shaft 130a. Further, a tension spring (not shown) is interposed between the rotating bar 322 and the rotating member 130, and the rotating bar 322 can be elastically biased toward the rotating member 130 side. This brings about the same effect as the pressing plate 122 in the first embodiment is elastically biased (see FIG. 6).

  The present invention described above is not limited by the above-described embodiments and the accompanying drawings, but various substitutions, modifications, and changes can be made without departing from the technical idea of the present invention. It is obvious to those who have ordinary knowledge in the field to which

100, 200, 300: Caster device 110: Crankshaft 111: Connection shaft 112: Crank arm 113: Crank pin 120, 220, 320: Press member 122, 222: Press plate 130: Rotating member 140: Connecting rod 150: Caster 155 : Cam element

Claims (12)

A caster that is mounted on a moving body with a reciprocating cam element;
A crankshaft coupled to the cam element;
A rotating member that is rotatably mounted on the movable body and includes a plurality of pins that are spaced apart along the circumferential direction;
A pressing member that is mounted on the movable body so as to move up and down and rotates the rotating member in contact with the pin;
A connecting rod connecting the rotating member and the crankshaft;
The caster device, wherein rotation of the rotating member due to movement of the pressing member is switched to reciprocal rotation of the cam element by the connecting rod and the crankshaft. The pressing member includes a pressing plate,
The press plate includes a first contact surface that contacts the pin when the pressing member moves downward, and a second contact surface that contacts the pin when the pressing member moves upward. The caster device according to 1.   The caster device according to claim 2, wherein the pressing plate includes a vertical portion and a horizontal portion extending from the vertical portion.   The caster device according to claim 3, wherein the second contact surface includes an upper flat surface and a tapered surface.   The caster device according to claim 2, wherein the pressing member further includes a spring that biases the pressing plate toward the rotating member.   The caster device according to claim 2, wherein the pressing member further includes a guide rod mounted on the movable body so as to move up and down and a compression spring disposed around the guide rod.   The caster device according to claim 6, wherein the pressing member is hinged to the movable body. The rotating member has a rotating shaft,
The pressing member includes a rotation bar that is rotatably coupled to the rotation shaft at one end.
2. The caster according to claim 1, wherein the rotating bar has a first contact surface that contacts the pin when rotating downward and a second contact surface that contacts the pin when rotating upward. apparatus.   The caster device according to claim 8, further comprising a spring disposed between the movable body and the rotating bar and biasing the rotating bar upward.   The caster device according to claim 1, wherein the pin is removably attached to the rotating member, and the pin has a tapered surface that contacts the pressing member at a tip thereof.   The caster device according to claim 1, wherein the pressing member includes a pedal plate.   The caster device according to claim 1, wherein the caster includes a push rod that moves up and down to different heights in a plurality of operation modes according to rotation of the cam element.

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