WO2024261797A1 - Locking device, clamp slider, and medical device - Google Patents

Abstract

The present invention provides, for example, a locking device that can appropriately switch between locking and unlocking, and that can easily maintain a locked state. Provided is a locking device which is provided to a clamp slider 1 that is guided using at least one guide rail R, said locking device comprising: a lock part (21) that contacts the guide rail and fixes movement of the clamp slider; a fixing force part (40) that applies a fixing force for causing the lock part to contact the guide rail; a first rolling element 22 that is disposed between the lock part and the fixing force part and that is capable of transmitting the fixing force from the fixing force part to the lock part; a second rolling element 23 that is disposed between the first rolling element and the fixing force part, that contacts the first rolling element, and that moves in a direction along the guide rail so as to lock or unlock movement of the clamp slider; and a third rolling element 24 that is disposed between the second rolling element and the fixing force part, that contacts the second rolling element, and that is capable of transmitting the fixing force from the fixing force part to the second rolling element.

Description

Locking device, clamp slider and medical device

The present invention relates to a locking device, a clamp slider, and a medical device.

For medical devices such as operating tables used in operating rooms or treatment rooms, locking devices have been developed that lock and unlock the sliding of a table on which a patient rests depending on the situation of the medical procedure. For example, Patent Document 1 discloses a braking and clamping device that is provided on a carriage guided by a guide rail, and has at least one friction locking device that can be operated via a sliding wedge transmission device, the friction locking device has at least one pressing member supported in a housing and capable of being pressed against the guide rail, the sliding wedge transmission device is moved in one direction using at least a spring force to load the friction locking device, and is moved in the opposite direction by at least one piston using air or hydraulic pressure to release the load, and the sliding wedge of the sliding wedge transmission device acts on the pressing member via at least one rolling element, and the rolling element is supported in a cage.

Patent Publication No. 2012-517571

However, because the inclination of the sliding wedge causes the pressing member to be pressed against the guide rail, if the inclination of the wedge is small, the wedge may get caught in the locked state and be unable to be released, while if the inclination of the wedge is large, the reaction force is also large even in the locked state, so it is necessary to constantly press the wedge hard in the sliding direction. This makes it difficult to simultaneously switch between locking and unlocking and easily maintain the locked state.

The present invention was made in consideration of the above problems, and one example of the objective is to provide a locking device that can accurately switch between lock and unlock and easily maintain the locked state.

In order to solve the above problem, the invention described in claim 1 is a locking device provided on a clamp slider guided by at least one guide rail, and is characterized by comprising: a locking section that abuts against the guide rail to fix the movement of the clamp slider; a fixing force section that applies a fixing force to abut the locking section against the guide rail; a first rolling body that is arranged between the locking section and the fixing force section and is capable of transmitting a fixing force from the fixing force section to the locking section; a second rolling body that is arranged between the first rolling body and the fixing force section and abuts against the first rolling body and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider; and a third rolling body that is arranged between the second rolling body and the fixing force section and abuts against the second rolling body to transmit a fixing force from the fixing force section to the second rolling body.

The invention described in claim 2 is characterized in that in the locking device described in claim 1, the first rolling body, the second rolling body, and the third rolling body are in contact with each other and aligned in a row from the fixing force portion to the locking portion, thereby locking the movement of the clamp slider.

The invention described in claim 3 is characterized in that, in the locking device described in claim 2, the lined-up state is a state in which the second rolling body is moved in a direction along the guide rail and pressed into between the first rolling body and the third rolling body, going beyond an arrangement in which the centers of the first rolling body, the second rolling body, and the third rolling body are aligned in a straight line.

The invention described in claim 4 is characterized in that, in the locking device described in claim 2, it further includes a first piston rod that acts in a direction to push the second rolling body between the first rolling body and the third rolling body so that they are aligned in a row, and a second piston rod that is located opposite the first piston rod and moves the second rolling body out of the aligned state.

The invention described in claim 5 is characterized in that in the locking device described in claim 4, the first piston rod has contact surfaces that contact the first rolling body, the second rolling body, and the third rolling body, and the contact surface for the second rolling body protrudes further than the other contact surfaces.

The invention described in claim 6 is characterized in that, in the locking device described in claim 4, there is a cage that houses the first rolling body, the second rolling body, and the third rolling body, the cage has an opening through which the first piston rod can pass, and the cage has an inner surface that can abut against each of the rolling bodies when aligned in a row on the side opposite the first piston rod.

The invention described in claim 7 is characterized in that, in the locking device described in claim 5, there is a cage that houses the first rolling body, the second rolling body, and the third rolling body, the cage has an opening through which the first piston rod can pass, the cage has an inner surface that can come into contact with each rolling body when lined up in a row on the side opposite the first piston rod, and the inner surface has a recess corresponding to the second rolling body.

The invention described in claim 8 is characterized in that in the locking device described in claim 1, the second rolling element is moved in a direction along the guide rail by hydraulic pressure.

The invention described in claim 9 is characterized in that in the locking device described in claim 1, the fixing force part generates the fixing force by a spring mechanism.

The invention described in claim 10 is characterized in that in the locking device described in claim 1, the first rolling body, the second rolling body, and the third rolling body are cylindrical bodies.

The invention described in claim 11 is characterized by comprising: a groove portion of a housing in which a guide rail is guided; a locking portion that protrudes into the space within the groove portion and abuts against the guide rail to fix the movement of the clamp slider; a fixing force portion that applies a fixing force to abut the locking portion against the guide rail; a first rolling body that is arranged between the locking portion and the fixing force portion and is capable of transmitting a fixing force from the fixing force portion to the locking portion; a second rolling body that is arranged between the first rolling body and the fixing force portion and abuts against the first rolling body and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider; and a third rolling body that is arranged between the second rolling body and the fixing force portion and abuts against the second rolling body to transmit a fixing force from the fixing force portion to the second rolling body.

The invention described in claim 12 is a medical device including a table movable relative to a base, a guide rail that determines the direction of movement of the table, and a clamp slider that is guided relative to the guide rail to lock the movement, wherein the clamp slider has a locking section that comes into contact with the guide rail to fix the movement of the clamp slider, a fixing force section that applies a fixing force to bring the locking section into contact with the guide rail, a first rolling body that is disposed between the locking section and the fixing force section and is capable of transmitting a fixing force from the fixing force section to the locking section, a second rolling body that is disposed between the first rolling body and the fixing force section and comes into contact with the first rolling body and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider, and a third rolling body that is disposed between the second rolling body and the fixing force section and comes into contact with the second rolling body to transmit a fixing force from the fixing force section to the second rolling body.

According to the present invention, in the first rolling body, second rolling body, and third rolling body arranged in sequence between the locking section that abuts against the guide rail to fix the movement of the clamp slider, and the fixing force section that applies a fixing force to abut the locking section against the guide rail, the second rolling body enters between the first rolling body and the third rolling body, and the fixing force from the fixing force section is transmitted to the locking section to lock the movement of the clamp slider, and conversely, the second rolling body comes out and is released from the lock, so that switching between lock and unlock can be performed accurately and the locked state can be easily maintained.

FIG. 2 is a perspective view showing an example of an internal configuration of a clamp slider according to the embodiment. FIG. 2 is a perspective view showing an example of an outer configuration of the clamp slider in FIG. 1 . FIG. 2 is a perspective view showing an example of an outer configuration of the clamp slider in FIG. 1 . FIG. 4 is a cross-sectional view showing an example of a cross section of the clamp slider of FIG. 3 . FIG. 4 is a perspective cross-sectional view showing an example of a cross section of the clamp slider of FIG. 3 . FIG. 2 is a perspective view showing an example of a first piston rod of FIG. 1 . FIG. 2 is a perspective view showing an example of the cage of FIG. 1 . FIG. 2 is a perspective view showing an example of the cage of FIG. 1 . FIG. 2 is a perspective view showing an example of an arrangement of the cage and each member in FIG. 1 . FIG. 2 is a cross-sectional view showing an example of an arrangement of the cage and each member in FIG. 1 . 11A to 11C are cross-sectional views showing an example of the operation of a clamp slider. 11A to 11C are cross-sectional views showing an example of the operation of a clamp slider. FIG. 2 is a perspective view showing an example of the appearance of a surgical table using the clamp slider of FIG. 1 . FIG. 12 is a perspective view showing an example of a lateral slide portion of the operating table of FIG. 11 . FIG. 12 is a perspective view showing an example of a lifting section in the base of the operating table of FIG. 11 .

Below, an embodiment of the present invention will be described with reference to the drawings. Note that the embodiment described below is an embodiment in which the present invention is applied to a clamp slider or the like.

[1. Overview of the configuration and functions of the clamp slider and each part]
(1.1 Configuration and Functional Overview of Clamp Slider)

First, the configuration and general functions of a clamp slider according to one embodiment of the present invention will be described with reference to Figures 1 to 6.

FIG. 1 is a perspective view showing an example of the schematic configuration of a clamp slider according to this embodiment. FIGS. 2 and 3 are perspective views showing an example of the outer configuration of the clamp slider of FIG. 1. FIG. 4 is a cross-sectional view showing an example of a cross section taken along line A-A of the clamp slider 1 of FIG. 3. FIG. 5 is a perspective cross-sectional view showing an example of a cross section taken along line A-A of the clamp slider 1 of FIG. 3. FIG. 6 is a perspective view showing an example of a first piston rod of the clamp slider.

As shown in FIG. 1, the clamp slider 1 according to this embodiment includes a housing portion 10 that is slidably installed on the guide rail R, a lock/release portion 20 that locks and unlocks the movement of the clamp slider 1 on the guide rail R, hydraulic portions 30, 35 that lock and unlock the lock/release portion 20 using hydraulic pressure, a spring portion 40 that applies a fixing force to bring it into contact with the guide rail, and a cage 50 that houses some of the components that make up the lock/release portion 20.

In addition, at least the locking/unlocking part 20 and the spring part 40 constitute a locking device of the locking mechanism provided on the clamp slider guided by the guide rail. The locking device may also have hydraulic parts 30, 35 and a cage 50.

The clamp slider 1 is fixed with a bolt or the like to an object that slides along the guide rail R, and fixes or releases the sliding movement of the object. For example, when the clamp slider 1 is installed on an operating table, it fixes or releases the sliding movement of the table of the operating table. The locking device of the present application can be applied to objects that slide along guide rails, such as conveying devices for liquid crystal or semiconductors, machine tools, etc.

As shown in Figures 1 to 4, the housing portion 10 has a groove portion 11 that slides the guide rail R, a through hole 12 that accommodates the hydraulic unit 30, a through hole 13 that accommodates the hydraulic unit 35, an accommodation space 14 that accommodates the cage 50, a through hole 15 that accommodates the pressing member 21 of the locking/unlocking unit 20, and a through hole 16 that accommodates the spring portion 40. The material of the housing portion 10 is a metal such as alloy steel, carbon steel, copper, copper alloy, iron casting, aluminum, or stainless steel.

The groove portion 11 is formed in a direction D1 along the guide rail R, and is large enough to accommodate the guide rail R.

The through hole 12 is cylindrical with a central axis C1 in a direction D1 along the guide rail R, and is formed to a size that can accommodate the piston of the hydraulic section 30. The through hole 12 has an opening that opens to the outside of the housing section 10, and is connected to the accommodation space 14 via the connection hole 14a.

The through hole 13 is cylindrical with a central axis C1 in a direction D1 along the guide rail R, and is formed to a size that can accommodate the piston of the hydraulic section 35. The through hole 13 has an opening that opens to the outside of the housing section 10, and is connected to the accommodation space 14 via the connection hole 14b.

The storage space 14 is large enough to store a cage 50, etc.

The through hole 15 is cylindrical with a central axis C2 perpendicular to the central axis C1, and is formed to a size that can accommodate the pressing member 21. The through hole 15 has an opening that opens into the groove portion 11 of the housing portion 10, and is connected to the accommodation space 14.

The through hole 16 is cylindrical with a central axis C2 and is formed in a size that can accommodate the disc springs and spring pistons of the spring portion 40. The through hole 16 has an opening that opens to the outside of the housing portion 10 and communicates with the accommodation space 14. The outer opening of the through hole 16 is fitted with a spring accommodation portion 42a that can accommodate stacked disc springs 42 using a screw structure.

As shown in FIG. 2, the housing part 10 has an attachment member 5 that is attached with a bolt or the like to an object that slides along the guide rail R. A recess is formed in the surface of the housing part 10 opposite the groove part 11, and the attachment member 5 is embedded in the recess. The center of the attachment member 5 is fixed to the housing part 10 with a bolt or the like. The attachment member 5 has four bolt holes formed in it for attaching it to the object.

The movement of the clamp slider 1 and the guide rail R is relative. For example, the attachment target attached by the attachment member 5 of the clamp slider 1 may move while being guided on a guide rail R installed on a base or the like, or at least one guide rail R attached to a table may slide while being guided on the clamp slider 1 attached to the attachment target installed on a base or the like.

As shown in Figures 1, 4 and 5, the locking/unlocking section 20 has a pressing member 21 that abuts against the guide rail R, a first rolling body 22 that can transmit the fixing force from the spring section 40 to the pressing member 21, a second rolling body 23 that abuts against the first rolling body 22 and moves in the direction D1 along the guide rail R to fix or release the movement of the clamp slider 1, and a rolling body 24 that abuts against the second rolling body 23 and can transmit the fixing force from the spring section 40 to the second rolling body 23. The first rolling body 22, the second rolling body 23 and the third rolling body 24 form a fixing force transmission section that transmits the fixing force from the spring section 40, which is a fixing force section, to the pressing member 21, which is an example of a locking section.

The pressing member 21 is an example of a locking portion that contacts the guide rail R to fix the movement of the clamp slider 1. The pressing member 21 is made of a metal such as carbon steel, alloy steel, steel, stainless steel, or copper alloy. The contact portion of the pressing member 21 with the guide rail R functions as a brake shoe.

The pressing member 21 is substantially cylindrical and has a flange 21a. The diameter of the flange 21a is larger than the diameter of the through hole 15 and is present on the storage space 14 side so that the pressing member 21 does not slip out of the through hole 15 into the groove 11. An elastic ring member is inserted into the portion of the flange 21a that corresponds to the inner wall of the storage space 14. This ring member abuts against the inner wall of the storage space 14 around the opening of the storage space 14 on the through hole 15 side. The pressing member 21 is biased toward the first rolling body 22 by this ring member. Therefore, even if the fixing force from the first rolling body 22 loosens in the unlocked state, the pressing member 21 and the first rolling body 22 do not separate from each other. Therefore, rattling does not occur. The material of the ring member is preferably elastic, such as urethane or rubber. The ring member may be an elastic member such as a metal disc spring. The ring member is not necessary.

The first rolling body 22 is cylindrical in shape. The central axis of the first rolling body 22, which is a cylinder, is perpendicular to the central axis C1 and the central axis C2. The first rolling body 22 is disposed between the pressing member 21 and the spring portion 40. The first rolling body 22 is disposed between the pressing member 21 and the second rolling body 23, in contact with each other. The cylindrical surface of the first rolling body 22 is in contact with the bottom surface of the pressing member 21 on the flange portion 21a side. The cylindrical surface of the first rolling body 22 is in contact with the cylindrical surface of the second rolling body 23. The first rolling body 22 is also capable of rolling contact with the pressing member 21 and the second rolling body 23.

The first rolling body 22 is an example of a first rolling body that is disposed between the locking portion and the fixing force portion and can transmit the fixing force from the fixing force portion to the locking portion.

The second rolling body 23 is cylindrical in shape. The central axis of the cylindrical second rolling body 23 is perpendicular to the central axis C1 and the central axis C2. The second rolling body 23 is disposed between the first rolling body 22 and the spring portion 40. The second rolling body 23 is disposed between the first rolling body 22 and the third rolling body 24 with their cylindrical surfaces in contact with each other. The second rolling body 23 is also capable of rolling contact with the first rolling body 22 and the third rolling body 24. The second rolling body 23 abuts against the first rolling body 22 and moves in a direction along the guide rail R to fix or release the movement of the clamp slider 1.

The second rolling body 23 is an example of a second rolling body that is disposed between the first rolling body and the fixed force portion, comes into contact with the first rolling body, and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider.

The third rolling body 24 is cylindrical in shape. The central axis of the cylindrical third rolling body 24 is perpendicular to the central axis C1 and the central axis C2. The third rolling body 24 is disposed between the second rolling body 23 and the spring portion 40 in contact with each other. The cylindrical surface of the third rolling body 24 and the cylindrical surface of the second rolling body 23 are in contact. The cylindrical surface of the third rolling body 24 and the bottom surface of the spring piston 41 of the spring portion 40 are in contact. The third rolling body 24 is also capable of rolling contact with the bottom surfaces of the second rolling body 23 and the second spring piston 41. The third rolling body 24 abuts against the second rolling body 23 and is capable of transmitting the fixing force from the spring portion 40 to the second rolling body 23.

The third rolling body 24 is an example of a third rolling body that is disposed between the second rolling body and the fixing force section, abuts against the second rolling body, and is capable of transmitting the fixing force from the fixing force section to the second rolling body.

The central axes of the first rolling body 22, the second rolling body 23 and the third rolling body 24 are parallel to each other.

The first rolling body 22, the second rolling body 23, and the third rolling body 24 are preferably made of a material with low wear, such as alloy steel, carbon steel, stainless steel, or ceramic. The first rolling body 22, the second rolling body 23, and the third rolling body 24 are preferably cylindrical in shape, but may also be spherical.

The hydraulic section 30 has a cover member 31 with a packing mechanism to prevent hydraulic oil from leaking, a piston 32 that slides along the central axis C1 by the hydraulic oil, and a piston rod 33 connected to the piston 32 along the central axis C1.

The cover member 31 is fixed so as to cover one side of the through hole 12. The cover member 31 has a supply port through which hydraulic oil is supplied. The hydraulic unit 30 is connected to a hydraulic pump (not shown) via the cover member 31.

The piston 32 has a fitting hole formed in the center of one side of the piston 32 that fits with one end of the piston rod 33.

The piston 32 is made of steel, stainless steel, aluminum, or copper alloy.

A ring member made of elastomer such as rubber is installed on the piston 32 to prevent hydraulic oil from leaking out. The piston 32 slides inside the through hole 12. A tube-shaped member is inserted between the inner wall of the through hole 12 and the piston 32 to facilitate sliding of the piston 32 and to prevent hydraulic oil from leaking, in order to improve surface roughness and precision. Examples of materials for the tube-shaped member include steel, carbon steel, alloy steel, stainless steel, copper alloy, etc.

As shown in FIG. 6, the piston rod 33 has an abutment portion 33a that abuts against the second rolling body 23, an abutment portion 33b that abuts against the first rolling body 22 and the third rolling body 24, a fitting portion 33c that fits into a fitting hole in the piston rod 33, and four recesses 33d that are cut halfway from the abutment portion 33b side toward the center axis C3 direction. The abutment portion 33a protrudes slightly from the abutment portion 33b toward the second rolling body 23 in the sliding direction of the piston rod 33. This slight protrusion is preferably 1% to 5% of the diameter of the second rolling body 23. This slight protrusion corresponds to the recess on the surface 55a of the inner surface 55 of the cage 50 described later, so it is preferably the same as the recess on the surface 55a of the inner surface 55. The slight protrusion may be greater than 5%, but the fixing force will decrease.

Piston rod 33 is an example of a first piston rod that acts in a direction to push the second rolling body between the first rolling body and the third rolling body so that they are aligned in a row. Piston rod 33 has contact surfaces that contact the first rolling body, the second rolling body, and the third rolling body, and is an example of a first piston rod in which the contact surface with the second rolling body protrudes further than the other contact surfaces.

As shown in Figures 4 and 5, the piston rod 33 is installed from the through hole 12 into the connection hole 14a so that the central axis C3 of the piston rod 33 coincides with the central axis C1. The abutment portion 33a and the abutment portion 33b are present in the accommodation space 14. The piston rod 33 slides inside the connection hole 14a.

Materials for the piston rod 33 include steel, carbon steel, alloy steel, stainless steel, copper alloy, etc.

The hydraulic section 35 has a cover member 36 with a packing mechanism to prevent hydraulic oil from leaking, a piston 37 that slides in the direction of the central axis C1 by the hydraulic oil, and a piston rod 38 connected to the piston 37 in the direction of the central axis C1.

The lid member 36 is fixed so as to cover one side of the through hole 13. The lid member 36 has a supply port through which hydraulic oil is supplied. The hydraulic section 35 is connected to a hydraulic pump (not shown) via the lid member 36.

The piston 37 has a fitting hole formed in the center of one side of the piston 37, which fits with one end of the piston rod 38. The material of the piston 37 is the same as that of the piston 32. The piston 37 slides within the through hole 13. As in the case of the through hole 12, a tube-shaped member is inserted between the inner wall of the through hole 13 and the piston 37 to facilitate sliding of the piston 32 and to prevent hydraulic oil from leaking.

The piston rod 38 has an abutment portion that abuts against the second rolling body 23, and a main body portion that fits into the fitting hole of the piston 37. The piston rod 38 has a cylindrical main body portion with a smaller diameter than the piston rod 33 so that it abuts only against the second rolling body 23, and the abutment portion of the piston rod 38 is in the shape of a thin rectangular prism. One end of the cylindrical main body portion of the piston rod 38 serves as the fitting portion itself.

Piston rod 38 is an example of a second piston rod that is located opposite the first piston rod and moves the second rolling elements out of the aligned state.

As shown in Figures 4 and 5, the piston rod 38 is installed from the through hole 13 into the connection hole 14b so that the axis of the piston rod 38 coincides with the central axis C1. The abutment portion of the piston rod 38 is present in the accommodation space 14. The main body of the piston rod 38 slides inside the connection hole 14b. The material of the piston rod 38 is the same as that of the piston rod 33.

The hydraulic units 30 and 35 move the piston rod 33 and the piston rod 38 in reverse in unison. That is, when the piston rod 33 protrudes toward the second rolling body 23, the piston rod 38 retracts toward the cover member 36. When the piston rod 38 protrudes toward the second rolling body 23, the piston rod 33 retracts toward the cover member 31. In this way, the hydraulic units 30 and 35 move the second rolling body 23 in the direction along the guide rail R by hydraulic pressure.

The spring section 40 has a spring piston 41 that slides in the direction of the central axis C2, a number of disc springs 42 that generate a fixing force on the spring piston 41 in a direction toward the pressing member 21, and a lock/unlock sensor section 43 for detecting locking and unlocking.

The spring piston 41 has an abutment portion 41a that abuts against the third rolling body 24, and a spring shaft portion 41b that passes through a hole in a plurality of stacked disc springs 42. The shape of the spring piston 41 is a stack of cylinders with different diameters, and the diameter of the abutment portion 41a is larger than that of the spring shaft portion 41b. The material of the spring piston 41 is the same as that of the piston rod 33, etc.

The disc spring 42 is made of steel such as carbon steel, alloy steel, or stainless steel. The disc spring 42 and the spring piston 41 are housed in the spring housing 42a. The disc spring 42 mainly generates a fixing force that causes the spring to abut against the guide rail R. A coil spring may be used instead of the disc spring 42.

In this way, the spring portion 40 is an example of a fixing force portion that applies a fixing force to bring the pressing member 21, which is an example of a locking portion, into contact with the guide rail R. The spring portion 40 is an example of a fixing force portion that generates a fixing force by a spring mechanism.

The lock/unlock sensor unit 43 is formed of a cylindrical metal member. The lock/unlock sensor unit 43 is inserted into a cylindrical hole in the housing portion 43a and displaces in the direction of the central axis C2 following the movement of the spring piston 41. A displacement sensor (not shown) that detects the displacement in the direction of the central axis C2 is installed on the protruding portion of the lock/unlock sensor unit 43. The housing portion 43a is fixed to the spring housing portion 42a by four bolts. This displacement sensor is, for example, a switch that turns ON/OFF according to the movement of the lock/unlock sensor unit 43 in the direction of the central axis C2. In the locked state, the switch is pressed by the lock/unlock sensor unit 43, making electrical contact and turning the switch ON, and in the unlocked state, the lock/unlock sensor unit 43 retracts, breaking electrical contact and turning the switch OFF. The position of the displacement sensor is adjusted so that it operates in this way.

(1.2 Overview of the configuration and function of the cage 50)
Next, the configuration and function of the cage 50 will be outlined with reference to the drawings. Figures 7A and 7B are perspective views showing an example of the cage of Figure 1.

As shown in Figures 7A and 7B, the cage 50 has an opening 51 for the first rolling body 22, an opening 52 for the third rolling body 24, an opening 53 for the piston rod 33, and an opening 54 for the piston rod 38. The opening 51 is formed in an end face 50a of one bottom surface of the cylindrical cage 50, and the opening 52 is formed in an end face 50b of the other bottom surface of the cylinder. The openings 53 and 54 are formed in the cylindrical surface of the cylindrical cage 50.

The cage 50 is a cylindrical metal member with openings 51, 52, 53, 54 and an internal space formed so that the first rolling body 22 and the third rolling body 24 can be displaced in the direction of the central axis C4, and the piston rods 33, 38 and the second rolling body 23 can be displaced in the sliding direction of the piston rod. Examples of materials for the cage 50 include alloy steel, carbon steel, stainless steel, etc.

The shape of opening 51 is a rectangle in cross section in the longitudinal direction of first rolling body 22. The shape of opening 52 is a rectangle in cross section in the longitudinal direction of third rolling body 24. The shape of opening 53 is a shape that allows abutment portions 33a, 33b of piston rod 33 to slide. The shape of opening 54 is a shape that allows abutment portion of piston rod 38 to slide.

The cage 50 accommodates and covers the first rolling body 22, the second rolling body 23, the third rolling body 24, the piston rod 33 and the piston rod 38. The cage 50 accommodates these rolling bodies so as to maintain a predetermined arrangement. For example, the cage 50 acts to stabilize the arrangement of the first rolling body 22, the second rolling body 23 and the third rolling body 24 in the locked state arrangement and the unlocked state arrangement. The cage 50 also acts to ensure that the change in arrangement during the transition between the locked state and the unlocked state is carried out smoothly. The cage 50 is installed in the accommodation space 14 so that the central axis C4 of the cage 50 is parallel to the central axis C1. The cage 50 is accommodated in the accommodation space 14 so as to be displaceable in the direction of the central axis C1.

In this way, the cage 50 is an example of a cage that houses the first rolling body, the second rolling body, and the third rolling body. Also, the opening 53 is an example of an opening through which the first piston rod can pass.

The cage 50 has an internal surface 55 parallel to the central axis C4. The internal surface 55 has a surface 55a against which the second rolling body 23 can abut, and a surface 55b against which the first rolling body 22 and the third rolling body 24 can slide in the direction of the central axis C4. Surface 55a is formed slightly closer to the opening 54 than surface 55b, forming a concave shape in the internal surface 55. When locked, the second rolling body 23 can be positioned slightly closer to the opening 54 than the first rolling body 22 and the third rolling body 24. Surface 55a, which is a concave in the internal surface 55, corresponds to the protrusion of the protruding abutment portion 33a of the piston rod 33. This slight concave is preferably 1% to 5% of the diameter of the second rolling body 23. Since it corresponds to the abutment portion 33a of the piston rod 33, it is preferable that it is equivalent to the protrusion of the abutment portion 33a relative to the abutment portion 33b of the piston rod 33. Note that this slight recess may be greater than 5%, but the fixing force will decrease.

In this way, inner surface 55 is an example of an inner surface that can come into contact with each rolling element while aligned in a row on the side opposite the first piston rod. Inner surface 55 is an example of an inner surface that has a recess corresponding to the second rolling element.

(1.3 Arrangement of the cage 50 and each member)
Next, the arrangement of the cage 50 and each of the components of the hydraulic units 30, 35 and the locking/unlocking unit 20 will be described with reference to Figures 8 and 9. Figure 8 is a perspective view showing an example of the arrangement of the cage 50 and each of the components. Figure 9 is a cross-sectional view taken along line B-B in Figure 8, showing an example of the arrangement of the cage 50 and each of the components.

FIGS. 8 and 9 are diagrams showing the locked state. As shown in FIG. 8 and FIG. 9, the piston rod 33, the rolling bodies 22, 23, 24, and the piston rod 38 are arranged in the direction D1 along the guide rail R. The rolling bodies 22, 23, 24, and parts of the piston rod 33 and the piston rod 38 are housed in the cage 50. In the locked state, the first rolling body 22, the second rolling body 23, and the third rolling body 24 are arranged in a substantially straight line perpendicular to the direction D1.

In the locked state, the protruding abutment portion 33a of the piston rod 33 causes the second rolling body 23 to be closer to the piston rod 38 than the first rolling body 22 and the third rolling body 24. A part of the surface 55a of the cage 50 receives the second rolling body 23. The first rolling body 22 and the third rolling body 24 are sandwiched between the abutment portion 33b of the piston rod 33 and the surface 55b of the cage 50.

The piston rod 33 and the cage 50 can slide against each other in the direction D1 through the opening 53 of the cage 50. The piston rod 38 and the cage 50 can slide against each other in the direction D1 through the opening 52 of the cage 50.

A portion of the first rolling body 22 protrudes from the end face 50a in the direction of the central axis C2 through the opening 51 of the cage 50, and applies a fixing force to the pressing member 21. A portion of the third rolling body 24 protrudes from the end face 50b in the direction of the central axis C2 through the opening 54 of the cage 50, and abuts against the abutment portion 41a of the spring piston 41.

When the first rolling body 22, the second rolling body 23, and the third rolling body 24 are aligned in a substantially straight line, a locked state is reached in which the fixing force from the spring piston 41 is directly applied to the guide rail R. In other words, the first rolling body 22, the second rolling body 23, and the third rolling body 24 are in contact with each other and aligned in a line from the spring portion 40 toward the pressing member 21.

Furthermore, with the second rolling body 23 slightly shifted toward the piston rod 38, the first rolling body 22, the second rolling body 23, and the third rolling body 24 are sandwiched and fixed inside the cage 50 by the abutment parts 33a, 33b of the piston rod 33 and the faces 55a, 55b of the inner surface 55 of the cage 50, so that the locked state is stable even if there is an external force such as vibration. That is, the abutment part 33a of the piston rod 33 moves the second rolling body 23 in a direction along the guide rail R and acts in a direction to push it between the first rolling body 22 and the third rolling body 24, and the centers of the first rolling body 22, the second rolling body 23, and the third rolling body 24 are placed in a state beyond a straight line. This slight shift is preferably 1% to 5% of the diameter of the second rolling body 23. This slight deviation may be greater than 5%, but the fixing strength will decrease.

[2. Operation example of clamp slider 1]
Next, an example of the locking and unlocking operation of the clamp slider 1 will be described with reference to the drawings. Fig. 10A is a cross-sectional view showing the unlocked state of the clamp slider 1. Fig. 10B is a cross-sectional view showing the locked state of the clamp slider 1.

(2.1 Unlocked state)
Fig. 10A shows an unlocked state in which the clamp slider 1 and the guide rail R can freely slide relative to each other. As shown in Fig. 10A, in the unlocked state, the hydraulic pressure is controlled so that the hydraulic oil of the hydraulic unit 30 is taken out from the space between the cover member 31 and the piston 32, narrowing the space between the cover member 31 and the piston 32. Also, in this unlocked state, the hydraulic pressure is controlled so that the hydraulic oil of the hydraulic unit 35 is supplied to the space between the cover member 36 and the piston 37, widening the space between the cover member 36 and the piston 37.

The hydraulic pressure causes the piston rod 38 to slide and protrude towards the second rolling body 23 via the piston 37, pushing out the second rolling body 23. Meanwhile, the hydraulic pressure causes the piston rod 33 to retract towards the cover member 31 via the piston 32.

The second rolling body 23 is pushed out in the direction of the central axis C1, and is removed from the arrangement of the three rolling bodies, and the fixing force from the spring portion 40 to the first rolling body 22 is no longer transmitted. As a result, the fixing force from the spring portion 40 to the pressing member 21 is weakened, and the ring member of the flange portion 21a moves the pressing member 21 together with the first rolling body 22 toward the spring portion 40, and they are separated from the guide rail R.

In other words, when the first rolling body 22, the second rolling body 23, and the third rolling body 24 are in contact with each other and aligned in a row from the spring portion 40 toward the pressing member 21, the second rolling body 23 is removed, and the fixing force from the spring portion 40 cannot be sufficiently transmitted to the pressing member 21.

(2.2 Locked state)
Fig. 10B shows a locked state in which the guide rail R is locked by the clamp slider 1. As shown in Fig. 10B, in the locked state, the hydraulic pressure is controlled so that the hydraulic oil of the hydraulic unit 30 is supplied to the space between the cover member 31 and the piston 32, and the space between the cover member 36 and the piston 37 is expanded. Also, in this locked state, the hydraulic pressure is controlled so that the hydraulic oil of the hydraulic unit 35 is taken out of the space between the cover member 36 and the piston 37, and the space between the cover member 36 and the piston 37 is narrowed.

The piston rod 33 is pushed toward the three rolling bodies 22, 23, and 24 via the piston 32 by hydraulic pressure, and the piston rod 38 is retracted toward the cover member 36 via the piston 37 by hydraulic pressure. The three rolling bodies 22, 23, and 24 are sandwiched between the abutment surface of the piston rod 33 and the inner surface 55 of the cage 50, and are aligned in a substantially straight line in the direction of the central axis C2. More specifically, as shown in Figures 8 and 9, the second rolling body 23 is fixed in a state slightly shifted toward the piston rod 38. The second rolling body 23 is sandwiched between the abutment portion 33a of the piston rod 33 and the surface 55a of the inner surface 55 of the cage 50. The first rolling body 23 and the third rolling body 24 are sandwiched between the abutment portion 33b of the piston rod 33 and the surface 55b of the inner surface 55 of the cage 50.

With the three rolling elements 22, 23, and 24 aligned in a substantially straight line in the direction of the central axis C2, the fixing force from the spring portion 40 acts on the pressing member 21, causing the pressing member 21 to press against the guide rail R. The guide rail R is sandwiched and fixed between the pressing member 21 and the wall on the other side of the groove portion 11 of the housing portion 10.

In other words, when the first rolling body 22, the second rolling body 23 and the third rolling body 24 are in contact with each other and aligned in a row from the spring portion 40 to the pressing member 21, the third rolling body 24 can fully transmit the fixing force from the spring portion 40 to the second rolling body 23, and the first rolling body 22 can fully transmit the fixing force from the spring portion 40 to the pressing member 21.

(2.3 Transition from unlocked state to locked state)
Next, the transition from the unlocked state of FIG. 10A to the locked state of FIG. 10B, i.e., braking and locking, will be described.

As shown in Figures 10A and 10B, the piston rod 33 moves toward the three rolling bodies 22, 23, and 24 in the direction of the central axis C1 by controlling the hydraulic pressure. In particular, the piston rod 33 pushes the second rolling body 23 between the first rolling body 22 and the third rolling body 24. The second rolling body 23 moves in the direction of the central axis C1 by the hydraulic pressure.

When the second rolling body 23 is pressed in, the first rolling body 22, whose cylindrical surface is in contact with the second rolling body 23, moves toward the pressing member 21, moving the pressing member 21 toward the guide rail R. The third rolling body 24 moves toward the spring piston 41 along with the movement of the second rolling body 23 in the direction of the central axis C1. The spring piston 41, which abuts against the third rolling body 24, also moves toward the lock/unlock sensor unit 43 in the direction of the central axis C2, causing the disc spring 42 to contract and increasing the fixing force of the spring unit 40. In other words, the force with which the third rolling body 24 is pushed back toward the second rolling body 23 by the force of the disc spring 42 increases. The lock/unlock sensor unit 43 moves toward the outside of the housing unit 10, following the movement of the spring piston 41.

As shown in FIG. 10A, when the second rolling body 23 is pressed in, the cage 50 abuts against the main body of the piston rod 38. The movement of the first rolling body 22 and the third rolling body 24 in the direction of the central axis C1 is restricted by the surface 55b of the inner surface 55 of the cage 50. Therefore, the hydraulic force from the piston rod 33 moves the pressing member 21 toward the guide rail R via the first rolling body 22, which is in contact with the second rolling body 23 at its cylindrical surface, and is able to work sufficiently.

When the pressing member 21 comes into contact with the guide rail R and the brake is applied, the locking state is activated when the fixing force from the pressing member 21 exceeds a predetermined value. When the second rolling body 23 is pressed further in and the centers of the three rolling bodies 22, 23, and 24 are aligned in a straight line along the central axis C2, the fixing force of the spring portion 40 is maximized.

Furthermore, the second rolling body 23 moves slightly toward the piston rod 38 due to the abutment portion 33a of the piston rod 33. At this time, the first rolling body 22 and the third rolling body 24 are sandwiched between the abutment portion 33b of the piston rod 33 and the surface 55b of the inner surface 55 of the cage 50, and the three rolling bodies 22, 23, 24 are fixed and stabilized. Although the centers of the three rolling bodies 22, 23, 24 deviate slightly from a state in which they are aligned in a straight line in the direction of the central axis C2, the three rolling bodies 22, 23, 24 are approximately aligned, sufficiently locking the guide rail R, and the locking is completed as shown in FIG. 10B.

(2.4 Transition from Locked State to Unlocked State)
Next, the transition from the unlocked state in FIG. 10A to the locked state in FIG. 10B, that is, unlocking, will be described.

As shown in Figures 10B to 10A, the piston rod 38 moves toward the three rolling bodies 22, 23, and 24 in the direction of the central axis C1 under hydraulic control. In particular, the piston rod 38 pushes out the second rolling body 23 from between the first rolling body 22 and the third rolling body 24.

At this time, when the hydraulic force of the piston rod 38 reaches or exceeds a predetermined value, the centers of the three rolling bodies 22, 23, 24 are aligned in a straight line along the central axis C2, overcoming the state where the fixing force of the spring portion 40 is at its maximum. Once this state is overcome, the first rolling body 22 and the third rolling body 24 suddenly come apart from the second rolling body 23, whose cylindrical surfaces are in contact with each other, and the transmission of the fixing force from the spring portion 40 of the pressing member 21 is cut off, and the lock is released all at once.

The third rolling body 24 moves toward the pressing member 21 along with the movement of the second rolling body 23 in the direction of the central axis C1. The spring piston 41 that contacts the third rolling body 24 also moves toward the pressing member 21 in the direction of the central axis C2, the disc spring 42 loosens, and the fixing force of the spring part 40 also decreases. The lock/release sensor part 43 moves toward the pressing member 21, i.e., toward the inside of the housing part 10, following the movement of the spring piston 41.

In the clamp slider 1 according to the embodiment, the first rolling body 22, the second rolling body 23, and the third rolling body 24 are arranged in order between the pressing member 21 that abuts against the guide rail R to fix the movement of the clamp slider 1, and the spring section 40 that applies a fixing force to abut the pressing member 21 against the guide rail R. The second rolling body 23 enters between the first rolling body 22 and the third rolling body 24, and the fixing force from the spring section 40 is transmitted to the pressing member 21 to lock the movement of the clamp slider 1, and conversely, the second rolling body 23 comes out and the lock is released, so that the lock and unlock can be switched accurately and the locked state can be easily maintained. Furthermore, the clamp slider 1 according to the embodiment can quickly transition between the locked state and the unlocked state.

In the case of a sliding wedge, as in conventional technology, the fixing force that fixes the guide rail R is constant. Therefore, in order to increase the fixing force, it was necessary to reduce the angle of the wedge and make it closer to parallel. However, if the wedge angle is closer to parallel, there was a risk that the wedge would get stuck like a stake being driven into the ground, making it impossible to release the lock.

On the other hand, in the case of rolling bodies rather than sliding wedges as in the present application, when the rolling body 23 is pushed and the centers of the three rolling bodies 22, 23, 24 are aligned in a straight line along the central axis C2, the fixing force of the spring section 40 is at its maximum. As they approach a straight line even before they are aligned, the force pushing back against the spring section 40 becomes stronger, allowing the spring section 40 to generate a stronger spring force. Furthermore, the second rolling body 23 can be easily removed from the line-up of the three rolling bodies by the piston rod 38, making it easy to unlock.

Also, as in the prior art, when a sliding wedge has a small inclination, the wedge needs to be slid a large distance, but the clamp slider 1 according to the embodiment does not need to shift the rolling element a large distance, so it can be made smaller.

When the movement of the clamp slider 1 is locked by the first rolling body 22, the second rolling body 23, and the third rolling body 24 abutting against each other and aligned in a row from the spring section 40 toward the pressing member 21, the fixing force from the spring section 40 acts directly on the pressing member 21 via the aligned first rolling body 22, the second rolling body 23, and the third rolling body 24, so that the movement of the clamp slider 1 is reliably locked.

When the state of being lined up in a row is such that the second rolling body 23 is moved in a direction along the guide rail R and pushed between the first rolling body 22 and the third rolling body 24, and the centers of the first rolling body 22, the second rolling body 23, and the third rolling body 24 go beyond the state of being lined up in a straight line, the second rolling body 23 once goes beyond the state of being lined up in a straight line, and thus acts as a barrier to move the second rolling body 23 back in the opposite direction, stabilizing the locked state and making it easier to maintain the locked state.

If there is further provided a piston rod 33 that acts in a direction to push the second rolling body 23 between the first rolling body 22 and the third rolling body 24 so that they are aligned in a row, and a piston rod 38 that is positioned opposite the piston rod 33 and moves the second rolling body 23 out of the aligned state, the piston rod 33 and piston rod 38 that act in a direction along the guide rail R can accurately switch between the locked and unlocked states and can easily maintain the locked state. This also allows for a quick transition between the locked and unlocked states.

If the piston rod 33 has contact portions 33a and 33b that contact the first rolling body 22, the second rolling body 23, and the third rolling body 24, and the contact surface of the contact portion 33a that contacts the second rolling body 23 protrudes beyond the contact surface of the contact portion 33b, the second rolling body 23 can be pushed in slightly by the protruding amount so that it goes beyond the arrangement in which it is aligned in a straight line, and this acts as a barrier to move the second rolling body 23 back in the opposite direction, stabilizing the locked state and making it easier to maintain the locked state.

If there is a cage 50 that houses the first rolling body 22, the second rolling body 23, and the third rolling body 24, and the cage 50 has an opening 53 through which the piston rod 33 can pass, and the cage 50 has an inner surface 55 that can come into contact with each of the rolling bodies when lined up in a row on the opposite side to the piston rod 33, the piston rod 33 and the inner surface 55 of the cage 50 can sandwich and fix each of the rolling bodies in a row, making the locked state more stable and making it easier to maintain the locked state.

The cage 50 contains the first rolling body 22, the second rolling body 23, and the third rolling body 24, and the cage 50 has an opening 53 through which the piston rod 33 can pass. The cage 50 has an inner surface 55 that can come into contact with each of the rolling bodies when aligned in a row on the opposite side to the piston rod 33. When the inner surface 55 has a recessed surface 55a corresponding to the second rolling body 23, the second rolling body 23 can fix each of the rolling bodies 22, 23, 24 in a state where the centers of the rolling bodies are not aligned in a straight line, and the locked state becomes more stable.

When the second rolling body 23 is moved in a direction along the guide rail R by hydraulic pressure, the hydraulic pressure allows the second rolling body 23 to be moved quietly and reliably.

When the fixing force is generated by a spring mechanism, the driving mechanism for the fixing force can be made smaller. In particular, the disc spring 42 allows for further miniaturization.

When the first rolling body 22, the second rolling body 23 and the third rolling body 24 are cylindrical, unlike wedges, the cylindrical surfaces come into contact with each other, and the second rolling body 23 moves between the first rolling body 22 and the third rolling body 24 when locked and moves out when unlocked, so that the locked and unlocked states switch clearly and the transition between the locked and unlocked states can be made quickly. It is also possible to form a barrier that causes the second rolling body 23 to return in the opposite direction, making it possible to stabilize the locked state.

[3. Application Examples]
Next, a surgical table to which the clamp slider 1 of the present application is applied will be described with reference to Fig. 11 to Fig. 13. Fig. 11 is a perspective view showing an example of the appearance of a surgical table using the clamp slider 1. Fig. 12 is a perspective view showing an example of a lateral slide part of the surgical table in Fig. 11. Fig. 13 is a perspective view showing an example of a lift part in the base of the surgical table in Fig. 11.

The operating table 60 to which the clamp slider 1 is applied comprises a table 61 that slides in the longitudinal direction, a lateral slide section 62 that slides in the lateral direction, a lift section 63 for adjusting the height, a base 64 that is placed on the floor of an operating room or the like, and a controller 65 that controls the hydraulic pressure for moving the table 61, etc.

Two parallel guide rails R are fixed to the back side of the table 61 with bolts or the like.

As shown in FIG. 12, the horizontal slide section 62 has a clamp slider 1 fixed to a plate member 62a by a bolt or the like on a mounting member 5. Two guide rails R of the table 61 are slidable relative to the horizontal slide section 62. The clamp slider 1 acts on one of the guide rails R, and the longitudinal movement of the table 61 is locked or released by hydraulic pressure in response to commands from the controller 65.

In addition, three parallel guide rails R shown in Figure 13 are fixed to the back side of the horizontal slide section 62 with bolts or the like.

As shown in FIG. 13, one clamp slider 1 is fixed to the lifting section 63 with a mounting member 5 bolt or the like for the middle guide rail R of the three guide rails R. The three guide rails R of the table 61 are slidable relative to the lifting section 63. The clamp slider 1 acts on one of the guide rails R, and the movement of the lateral slide section 62 in the short direction is locked or released by hydraulic pressure according to commands from the controller 65.

By using the clamp slider 1, the transition from the locked state to the unlocked state can be made quickly, so the locked table 61 can be quickly unlocked and slid. This allows accurate switching between lock and unlock even during surgery, and the table 61 can be accurately fixed in the locked state.

1: Clamp slider 10: Housing portion 20: Lock/release portion 21: Pressing member (lock portion)
22: First rolling element 23: Second rolling element 24: Third rolling element 30, 35: Hydraulic section 33: Piston rod (first piston rod)
38: Piston rod (second piston rod)
40: Spring part (fixing force part)
50: Cage

Claims (12)

A locking device provided on a clamp slider guided by at least one guide rail, comprising:
a lock portion that abuts against the guide rail to fix the movement of the clamp slider;
a fixing force portion that applies a fixing force to bring the lock portion into contact with the guide rail;
a first rolling element disposed between the lock portion and the fixing force portion and capable of transmitting a fixing force from the fixing force portion to the lock portion;
a second rolling body that is disposed between a first rolling body and the fixing force portion, comes into contact with the first rolling body, and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider;
a third rolling element that is disposed between the second rolling element and the fixing force portion, that comes into contact with the second rolling element, and that is capable of transmitting a fixing force from the fixing force portion to the second rolling element;
A locking device comprising: 2. The locking device according to claim 1,
A locking device characterized in that the first rolling body, the second rolling body, and the third rolling body abut against each other and are aligned in a row from the fixing force portion to the locking portion, thereby locking the movement of the clamp slider. 3. The locking device according to claim 2,
The state of being lined up in a row is
a locking device characterized in that the second rolling element is moved in a direction along the guide rail and forced into between the first rolling element and the third rolling element, thereby moving the second rolling element beyond a state in which the centers of the first rolling element, the second rolling element, and the third rolling element are aligned in a straight line. 3. The locking device according to claim 2,
a first piston rod that acts in a direction to push the second rolling element between the first rolling element and the third rolling element so that the second rolling element is aligned in a line;
a second piston rod located opposite the first piston rod and configured to move the second rolling element out of the aligned state;
The locking device further comprises: 5. The locking device according to claim 4,
a locking device characterized in that the first piston rod has a contact surface that contacts the first rolling body, the second rolling body and the third rolling body, and the contact surface with the second rolling body protrudes further than the other contact surfaces. 5. The locking device according to claim 4,
a cage that houses the first rolling body, the second rolling body, and the third rolling body;
the cage has an opening through which the first piston rod can pass;
The locking device according to claim 1, wherein the cage has an inner surface capable of abutting with each of the rolling elements when aligned in a row on the side opposite the first piston rod. 6. The locking device according to claim 5,
a cage that houses the first rolling body, the second rolling body, and the third rolling body;
the cage has an opening through which the first piston rod can pass;
the cage has an inner surface that is capable of contacting each of the rolling elements in the aligned state on the side opposite to the first piston rod,
A locking device, characterized in that the inner surface has a recess corresponding to the second rolling element. 2. The locking device according to claim 1,
A locking device, characterized in that the second rolling element is moved in a direction along the guide rail by hydraulic pressure. 2. The locking device according to claim 1,
A locking device, wherein the fixing force portion generates the fixing force by a spring mechanism. 2. The locking device according to claim 1,
A locking device, wherein the first rolling element, the second rolling element and the third rolling element are cylindrical bodies. a groove portion of the housing in which the guide rail is guided;
a lock portion that protrudes into the space within the groove portion and abuts against the guide rail to fix the movement of the clamp slider;
a fixing force portion that applies a fixing force to bring the lock portion into contact with the guide rail;
a first rolling element disposed between the lock portion and the fixing force portion and capable of transmitting a fixing force from the fixing force portion to the lock portion;
a second rolling body that is disposed between a first rolling body and the fixing force portion, comes into contact with the first rolling body, and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider;
a third rolling element that is disposed between the second rolling element and the fixing force portion, that comes into contact with the second rolling element, and that is capable of transmitting a fixing force from the fixing force portion to the second rolling element;
A clamp slider comprising: A medical device comprising: a table movable relative to a base; a guide rail that defines a moving direction of the table; and a clamp slider that is guided relative to the guide rail and locks the movement,
The clamp slider is
a lock portion that abuts against the guide rail to fix the movement of the clamp slider;
a fixing force portion that applies a fixing force to bring the lock portion into contact with the guide rail;
a first rolling element disposed between the lock portion and the fixing force portion and capable of transmitting a fixing force from the fixing force portion to the lock portion;
a second rolling body that is disposed between a first rolling body and the fixing force portion, comes into contact with the first rolling body, and moves in a direction along the guide rail to lock or unlock the movement of the clamp slider;
a third rolling element that is disposed between the second rolling element and the fixing force portion, that comes into contact with the second rolling element, and that is capable of transmitting a fixing force from the fixing force portion to the second rolling element;
A medical device comprising:

Images