Seat delivery structure

Abstract

To provide a seat delivery structure capable of effectively preventing a human error related to a connection lock in delivering a sitting seat.SOLUTION: A seat delivery structure includes: a sitting seat 22 being separable from a wheelchair 10; a seat base 14 arranged in the wheelchair 10; an arm base 36 connected to a mobile body 30; a first lock mechanism 40F for locking a connection between the seat base 14 and the sitting seat 22; and a second lock mechanism 40S for locking a connection between the arm base 36 and the sitting seat 22. When the seat base 14 is lowered to pass by the arm base 36, the first lock mechanism 40F is released and the second lock mechanism 40S is validated. When the seat base 14 is elevated to pass by the arm base 36, the first lock mechanism 40F is validated and the second lock mechanism 40S is released.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present specification discloses a seat transfer structure for transferring a seat between a moving body and a wheelchair. [Background technology]

[0002] There are cases where people with mobility difficulties who use wheelchairs (for example, people with disabilities or elderly people) use a vehicle. In this case, it is conceivable that the person with mobility difficulties can board the vehicle together with their wheelchair while remaining seated in the wheelchair. However, depending on the amount of available space on the vehicle, it may be difficult to board the person with mobility difficulties together with their wheelchair.

[0003] Therefore, there are cases where the person with walking difficulties is asked to transfer from the wheelchair to the passenger seat provided on the vehicle, but the task of transferring from the wheelchair to the passenger seat is a heavy burden for the person with walking difficulties.

[0004] Patent Document 1 discloses a wheelchair that assists users in transferring from the wheelchair to another bed or the like. Specifically, in the case of the wheelchair in Patent Document 1, the armrests are tilted toward the bed while the wheelchair is parked next to the bed or the like. This causes the armrests to act as a bridge between the seat and the bed. A person with walking difficulty can use this bridge to transfer to the bed or the like.

[0005] However, in the case of the wheelchair of Patent Document 1, the person with walking difficulties needs to move from the seat of the wheelchair, and moving from the seat is a burden for the person with walking difficulties. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2007-090020 Summary of the Invention [Problem to be solved by the invention]

[0007] Therefore, it is conceivable to move the seat on which the person with a walking disability is sitting from the wheelchair to the mobile body, or from the mobile body to the wheelchair. In this case, the person with a walking disability can remain seated in the seat, which can significantly reduce the burden on the person with a walking disability.

[0008] However, in this case, the connected object of the seat changes to either a wheelchair or a moving object during the movement of the seat. When the connected object changes, the connection lock with the connected object also needs to be enabled or disabled. If the connection lock is manually switched, there is a risk of human error, such as forgetting to switch the lock.

[0009] Therefore, this specification discloses a seat delivery structure that can effectively prevent human error regarding the connection lock when delivering a seat. [Means for solving the problem]

[0010] The seat transfer structure disclosed in this specification includes a seating seat on which a subject person sits and which is detachable from a wheelchair, a seat base provided on the wheelchair and connectable to the seating seat while supporting the seat from below, a movable arm connected to a moving body, an arm base attached to the movable arm, the arm base being connectable to the seating seat while supporting the seat from below and capable of passing above and below the seat base, a first locking mechanism for locking the connection between the seat base and the seating seat, and a second locking mechanism for locking the connection between the arm base and the seat. and a second locking mechanism that locks the seat base relative to the arm base, and when the seat base descends relative to the arm base and passes by the arm base, the seat is handed over from the seat base to the arm base, the first locking mechanism is released, and the second locking mechanism is activated, and when the seat base rises relative to the arm base and passes by the arm base, the seat is handed over from the arm base to the seat base, the first locking mechanism is activated, and the second locking mechanism is released.

[0011] With this configuration, the locked states of the first locking mechanism and the second locking mechanism are automatically switched during the process of transferring the seat, thereby effectively preventing human error regarding the connection lock during the transfer of the seat.

[0012] In this case, both the first locking mechanism and the second locking mechanism are engaging members attached to the seat, and include an engaging member that is movable between a locked position where it can engage with a target base and a released position where it is disengaged from the target base and is horizontally spaced from the locked position, a biasing member that biases the engaging member in a direction approaching the locked position, and a pressure-receiving portion that converts an upward force received from a non-target base into a force in a direction approaching the released position and transmits it to the engaging member, and in the first locking mechanism, the target base may be the seat base and the non-target base may be the arm base, and in the second locking mechanism, the target base may be the arm base and the non-target base may be the seat base.

[0013] This configuration allows the lock state to be automatically switched without the need for an electrical component, effectively preventing human error in the interlocking lock with a simple configuration.

[0014] In this case, the seat has a lock mounting hole, and the engaging member has an advance / retract block that can advance / retract horizontally within the lock mounting hole, a clamping portion that is connected to the advance / retract block and that cooperates with the seat to clamp the target base from above and below in the released position, and an insertion hole formed in the advance / retract block into which a portion of the non-target base can enter, and the pressure-receiving portion forms part of the inner surface of the insertion hole and is an inclined surface that inclines in the direction approaching the lock position as it approaches the upper part.

[0015] By forming an insertion hole in the advancing / retreating block and using part of the inner peripheral surface of the insertion hole as the pressure-receiving portion, the size of the locking mechanism can be kept small.

[0016] In this case, both the first locking mechanism and the second locking mechanism may further have a positioning recess formed on the bottom surface of the seat and having a diameter that decreases as it approaches the top, and a positioning protrusion protruding from the non-target base and having a diameter that decreases as it approaches the top, and the non-target base may be positioned relative to the insertion hole by the positioning protrusion entering the positioning recess.

[0017] With this configuration, the non-target base can be easily and appropriately positioned relative to the insertion hole.

[0018] The seat may also have a seat portion that supports the subject's buttocks and a backrest portion that supports the subject's back, and the movable arm may be able to transport the seat connected to the arm base while the subject remains seated on the seat.

[0019] With this configuration, the subject can transfer while remaining seated in the seat. [Effects of the Invention]

[0020] According to the seat transfer structure disclosed in this specification, human error regarding the connection lock can be effectively prevented when transferring a seat. [Brief explanation of the drawings]

[0021] [Figure 1] FIG. 1 is a schematic diagram of a wheelchair and a moving body. [Figure 2] FIG. 2 is a perspective view of a support plate, a seat base, and an arm base. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2. [Figure 4] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] The seat handover structure will be described below with reference to the drawings. FIG. 1 is a schematic diagram of a wheelchair 10 and a mobile body 30. This seat handover structure is a structure for handing over a seating seat 22 on which a subject sits from the wheelchair 10 to the mobile body 30, or from the mobile body 30 to the wheelchair 10. The subject is a user of the wheelchair 10, who has difficulty walking on his or her own, such as a person with a disability or the elderly. In the following description, "front and back," "left and right," and "up and down" refer to front and back, left and right, and up and down from the perspective of the subject seated on the seat 22.

[0023] The wheelchair 10 is a chair-like device equipped with drive wheels, and is a welfare tool that assists the mobility of a user. In this specification, the drive wheels of the wheelchair 10 may be driven either manually or electrically. The wheelchair 10 may be a general wheelchair that can be operated by the user himself / herself, or a children's wheelchair that is intended to be operated only by a caregiver, i.e., a so-called buggy-type wheelchair.

[0024] The wheelchair 10 is broadly divided into a wheelchair body 12 and a seat 22. The wheelchair body 12 has a frame that supports the seat 22 and wheels for moving the frame. The frame has a seat base 14 that can be raised and lowered. As will be described later, the seat base 14 is a plate-shaped member on which the seat 22 is placed. The seat base 14 can be raised and lowered manually or electrically. For example, the seat base 14 can be raised and lowered by a lifting mechanism that has a power source such as a motor, hydraulic cylinder, or electromagnetic cylinder.

[0025] The seat 22 is a chair-like member on which the subject sits. The seat 22 is a member that can be separated from the wheelchair body 12. The seat 22 has a seat surface portion 23, a backrest portion 24, a leg rest 26, and armrests (not shown). The seat surface portion 23 supports the buttocks of the subject. A support plate 28 is fixed to the bottom surface of the seat surface portion 23. The seat 22 is connected to the seat base 14 by placing the support plate 28 on the seat base 14. Furthermore, the seat 22 is connected to the arm base 36 by placing the support plate 28 on an arm base 36, which will be described later. As will be described in detail later, when the seat 22 is connected to the arm base 36, the connection between the seat 22 and the seat base 14 is released. Furthermore, when the seat 22 is connected to the seat base 14, the connection between the seat 22 and the arm base 36 is released.

[0026] The backrest 24 extends from the rear end of the seat 23 and supports the back of the subject. The leg rest 26 extends downward from the front end of the seat 23 and is on which the subject's feet are placed. The armrests extend from both sides of the seat 23 and prevent the subject's body from jumping out of the seat 23 in the width direction. The subject, while seated on the seat 22, transfers the seat 22 from the wheelchair 10 to the mobile unit 30 or from the mobile unit 30 to the wheelchair 10.

[0027] The vehicle 30 is a device for transporting passengers, such as an automobile, an airplane, or a train. The vehicle 30 is equipped with a passenger seat 32 on which the passenger sits. FIG. 1 illustrates a case in which the vehicle 30 is an automobile and the passenger seat 32 is a passenger seat.

[0028] A movable arm 34 is attached to the side of the passenger seat 32. The movable arm 34 is an assisting device for transferring the subject from the wheelchair 10 to the mobile body 30, or from the mobile body 30 to the wheelchair 10. The movable arm 34 is a multi-joint arm in which multiple links are connected via joints. By changing the position of the movable arm 34, the position of an arm base 36, which will be described later, can be changed. The position of the movable arm 34 may be changed manually or electrically.

[0029] An arm base 36 is attached to the end of the movable arm 34. The arm base 36 is a plate-like member that can be connected to the seat 22 while supporting the seat 22 from below. With the seat 22 connected to the arm base 36, the seat 22 can be easily moved by moving the movable arm 34. When transferring the seat 22 between the seat base 14 and the arm base 36, the worker changes the position of the wheelchair 10 and the posture of the movable arm 34 to position the arm base 36 directly above or directly below the support plate 28, for example, at position P1 in FIG. 1. When moving the subject using the moving body 30, the worker changes the posture of the movable arm 34 to position the arm base 36, which has received the seat 22, directly above the occupant seat 32, i.e., at position P2 in FIG. 1.

[0030] In this example, the subject can transfer from the wheelchair 10 to the mobile unit 30, or from the mobile unit 30 to the wheelchair 10, while remaining seated on the seating seat 22. When transferring the subject, the seating seat 22 is handed over from the seat base 14 to the arm base 36, or from the arm base 36 to the seat base 14. This handover of the seating seat 22 will be explained with reference to Figures 2 and 3. Figure 2 is a perspective view of the support plate 28, the seat base 14, and the arm base 36. Figure 3 is a cross-sectional view taken along line AA in Figure 2. In the following figures, "Fr," "Up," and "Rh" indicate the front, upper, and right side, respectively.

[0031] As described above, the support plate 28 constitutes a part of the seat 22. A first locking mechanism 40F and a second locking mechanism 40S are attached to the support plate 28. The first locking mechanism 40F locks the connection between the seat 22 and the seat base 14. Four first locking mechanisms 40F are provided, one near each of the four corners of the support plate 28. The second locking mechanism 40S locks the connection between the seat 22 and the arm base 36. Four second locking mechanisms 40S are provided, one near each of the first locking mechanisms 40F. The configurations of the first locking mechanisms 40F and the second locking mechanisms 40S will be described later.

[0032] The seat base 14 is a plate-like member having approximately the same width as the support plate 28, and is capable of supporting the seat 22, including the support plate 28, from below. As shown in FIG. 2, the seat base 14 has a large notch 16 formed in the center portion in the width direction. Therefore, the seat base 14 has a fork-like shape or a shape resembling the kanji character for "mountain" when viewed from above.

[0033] The arm base 36 is also a plate-shaped member, and can support the seat 22 including the support plate 28 from below. The arm base 36 is shaped to fit within the notch 16 formed in the seat base 14. This allows the arm base 36 to pass above and below the seat base 14.

[0034] When it is desired to transfer the seat 22, the seat base 14 is raised or lowered so as to pass by the arm base 36. For example, consider the case where the seat 22 is transferred from the wheelchair 10 to the movable arm 34. In this case, as shown in the upper part of FIG. 3, before the transfer, the support plate 28 is placed on and connected to the seat base 14. When the seat 22 is transferred to the movable arm 34, as shown in the upper part of FIG. 3, the arm base 36 is positioned directly below the support plate 28. Thereafter, as shown in the middle and lower parts of FIG. 3, the seat base 14 is lowered relative to the arm base 36. During this lowering process, as shown in the lower part of FIG. 3, the support plate 28 is placed on the arm base 36, and the seat 22 is connected to the arm base 36. Furthermore, during the lowering process, the connection between the seat 22 and the seat base 14 is released.

[0035] When transferring the seat 22 from the movable arm 34 to the wheelchair 10, the process is reversed. That is, before transferring the seat 22 from the movable arm 34 to the wheelchair 10, the support plate 28 is placed on the arm base 36, and the seat 22 is connected to the arm base 36, as shown in the lower part of FIG. 3. When transferring the seat 22 to the seat base 14, the seat base 14 is positioned directly below the support plate 28. The seat base 14 then rises relative to the arm base 36. During this rising process, the support plate 28 is placed on the seat base 14, and the seat 22 is connected to the seat base 14, as shown in the upper part of FIG. 3. Also, during the rising process, the connection between the seat 22 and the arm base 36 is released. The arm base 36 then separates from the wheelchair 10, and the seat base 14 descends to a height at which the target person can sit stably.

[0036] As is clear from the above description, in this example, the seat base 14 passes the arm base 36 in the up-down direction, thereby transferring the seat 22. As the seat 22 is transferred, the connection between the seat base 14 and the arm base 36 and the connection between the seat 22 and the arm base 36 are automatically locked or unlocked, respectively. That is, when the seat 22 is transferred from the seat base 14 to the arm base 36, the first locking mechanism 40F is automatically released, and the second locking mechanism 40S is automatically activated. Similarly, when the seat 22 is transferred from the arm base 36 to the seat base 14, the first locking mechanism 40F is automatically activated, and the second locking mechanism 40S is automatically released. The configurations of the first locking mechanism 40F and the second locking mechanism 40S will be described.

[0037] Fig. 4 is a perspective view of the periphery of the first locking mechanism 40F. Note that in Fig. 4, the support plate 28 is partially cut away for easier viewing. As shown in Figs. 2 to 4, a lock mounting hole 42F for receiving the first locking mechanism 40F is formed in the support plate 28. The lock mounting hole 42F is a substantially rectangular through-hole that is elongated in the width direction. Guide grooves 44F (see Fig. 4) extending in the width direction are formed in the front and rear end surfaces of the lock mounting hole 42F.

[0038] The first locking mechanism 40F includes an engaging member 46F and a biasing member 58F. The engaging member 46F can be broadly divided into an advancing / retracting block 48F that advances and retreats in the width direction within the lock mounting hole 42F and a generally L-shaped clamping portion 50F that protrudes downward from the advancing / retracting block 48F. Guide pins 52F protrude from the front and rear end surfaces of the advancing / retracting block 48F. These guide pins 52F are inserted into the guide grooves 44F, which prevents the engaging member 46F from falling out and allows it to advance and retreat between the locked position and the unlocked position. In the first locking mechanism 40F, the locked position is closer to the widthwise end of the seat 22 than the unlocked position.

[0039] The clamping portion 50F protrudes downward from the end of the advancing / retreating block 48F on the locking side. The distal end of the clamping portion 50F is bent in a direction approaching the locking position. As shown in the upper part of Figure 3, the clamping portion 50F clamps the seat base 14 between itself and the support plate 28, thereby locking the connection between the seat base 14 and the seating seat 22.

[0040] The advancing / retreating block 48F has an insertion hole 54F into which a locking pin 60F, described later, is inserted. As shown in FIGS. 3 and 4, the insertion hole 54F is a hole that penetrates the advancing / retreating block 48F from top to bottom. A portion of the inner circumferential surface of the insertion hole 54F forms an inclined surface that approaches the locking position as it approaches the top. This inclined surface functions as a pressure-receiving portion 56F that converts the upward force received from the locking pin 60F into a force in the release direction.

[0041] The biasing member 58F biases the advancing / retreating block 48F in a direction approaching the locked position. The biasing member 58F is, for example, a tension coil spring that connects the locking direction end of the advancing / retreating block 48F to the locking direction end of the lock mounting hole 42F, as shown in FIGS. 3 and 4. When the advancing / retreating block 48F slides to the unlocked position against the biasing force of the biasing member 58F, the clamping portion 50F moves away from the end of the seat base 14, as shown in the middle and bottom views of FIG. 3. This releases the connection lock between the seat 22 and the seat base 14.

[0042] A lock pin 60F that can enter the insertion hole 54F is formed on the arm base 36. When the seat base 14 is lowered with the arm base 36 positioned directly below the notch 16 of the seat base 14, the lock pin 60F comes into contact with the pressure-receiving portion 56F. The pressure-receiving portion 56F converts the upward force received from the lock pin 60F into a force moving toward the release position. This moves the engaging member 46F to the release position, and the connection between the seat 22 and the seat base 14 is released.

[0043] The second locking mechanism 40S has a configuration similar to that of the first locking mechanism 40F. However, the second locking mechanism 40S has a locked position and an unlocked position that are opposite to those of the first locking mechanism 40F. That is, the locked position of the second locking mechanism 40S is closer to the center of the seat 22 in the width direction than the unlocked position. A lock pin 60S protruding from the seat base 14 is inserted into the insertion hole 54S of the second locking mechanism 40S.

[0044] Next, we will explain the operation of the locking mechanisms 40F, 40S associated with the transfer of the seat 22. For example, consider the case where the seat 22 is transferred from the seat base 14 to the arm base 36. In this case, as shown in the upper part of Fig. 3, before the transfer, the first locking mechanism 40F is activated, and the connection between the seat 22 and the seat base 14 is locked. Meanwhile, the locking pin 60S standing from the seat base 14 is inserted into the insertion hole 54S of the second locking mechanism 40S, and the engaging member 46 of the second locking mechanism 40S is in the release position.

[0045] Subsequently, as the seat base 14 descends, the lock pin 60F extending from the arm base 36 enters the insertion hole 54F of the first locking mechanism 40F. Accordingly, the engagement member 46F of the first locking mechanism 40F gradually moves to the unlocked position. The middle part of FIG. 3 shows a state in which the seat base 14 and the arm base 36 are aligned at the same height. In this case, the lock pins 60F and 60S enter both the insertion hole 54F of the first locking mechanism 40F and the insertion hole 54S of the second locking mechanism 40S. Therefore, both the first locking mechanism 40F and the second locking mechanism 40S are unlocked.

[0046] Thereafter, when the seat base 14 is further lowered, the lock pin 60S extending from the seat base 14 is disengaged from the insertion hole 54S of the second locking mechanism 40S, as shown in the lower part of Fig. 3. In this case, the engaging member 46S of the second locking mechanism 40S is moved to the locked position by the force of the biasing member 58S. This locks the connection between the seat 22 and the arm base 36.

[0047] When transferring the seat 22 from the arm base 36 to the seat base 14, the process is reversed. That is, the seat 22 is transferred from the arm base 36 to the seat base 14 by moving from the lower stage in FIG. 3 to the middle stage and then to the upper stage. During this process, the engaging member 46S of the second locking mechanism 40S moves to the release position, and the engaging member 46F of the first locking mechanism 40F moves to the lock position. As a result, the connection between the seat 22 and the seat base 14 is locked, and the connection between the seat 22 and the arm base 36 is released.

[0048] As is clear from the above description, by providing the first locking mechanism 40F and the second locking mechanism 40S, the connection lock between the seating seat 22 and the seat base 14 or the seating seat 22 and the arm base 36 is automatically enabled or released when the seating seat 22 is handed over. In other words, when the seating seat 22 is handed over, the person to be transferred or the caregiver does not need to separately switch the lock. As a result, forgetting to lock the seat can be reliably prevented, and the person to be transferred can be transferred more safely.

[0049] In order to lock or unlock the locking mechanisms 40F, 40S, the seat base 14 and the arm base 36 must be appropriately positioned horizontally relative to the support plate 28. However, it is difficult to appropriately perform such horizontal positioning visually alone. Therefore, in this example, as shown in FIG. 3, a positioning recess 62 is formed in the support plate 28, and a positioning protrusion 64 is formed in the arm base 36 and the support plate 28. The positioning recess 62 is formed on the bottom surface of the support plate 28 and has a diameter that decreases as it approaches the top. The positioning protrusion 64 is also a protrusion that has a diameter that decreases as it approaches the top. When the positioning protrusion 64 enters the positioning recess 62, the lock pins 60F, 60S are positioned relative to the insertion holes 54F, 54S.

[0050] The configurations described so far are all examples, and other configurations may be changed as appropriate as long as they have the configuration described in claim 1. For example, as long as there are one or more first locking mechanisms 40F and one or more second locking mechanisms 40S, the number and arrangement thereof may be changed as appropriate.

[0051] Furthermore, the configuration of the locking mechanism 40 may be modified as appropriate as long as it can automatically switch between locked and unlocked states in response to the transfer of the seat 22. For example, in the above description, the pressure-receiving portions 56F, 56S are provided on the engaging members 46F, 46S, and the lock pins 60F, 60S are provided on the seat base 14 and the arm base 36, but this may be reversed. That is, the seat base 14 and the arm base 36 may be provided with inclined surfaces that function as the pressure-receiving portions 56F, 56S, and the engaging members 46F, 46S may be provided with lock pins 60F, 60S that abut against the pressure-receiving portions 56F, 56S. Furthermore, the locking mechanism 40 is not limited to being mechanically operated, and may be electrically operated. For example, a switch may be provided on the support plate 28 that contacts the lock pins 60F, 60S extending from the seat base 14 and the arm base 36, and a power source (such as a motor or electromagnetic cylinder) may be provided that moves the engaging members 46F, 46S to the unlocked position upon receiving a signal from the switch.

[0052] In the above description, the seat base 14 is raised and lowered, but the arm base 36 may be raised and lowered instead of or in addition to the seat base 14. Furthermore, in addition to the first locking mechanism 40F and the second locking mechanism 40S, a manually operated auxiliary locking mechanism may be provided. [Explanation of symbols]

[0053] 10 wheelchair, 12 wheelchair body, 14 seat base, 16 cutout, 22 seating seat, 23 seat surface portion, 24 backrest portion, 26 leg rest, 28 support plate, 30 moving body, 32 occupant seat, 34 movable arm, 36 arm base, 40 locking mechanism, 42 lock mounting hole, 44 guide groove, 46 engaging member, 48 advance / retreat block, 50 clamping portion, 52 guide pin, 54 insertion hole, 56 pressure receiving portion, 58 biasing member, 60 lock pin, 62 positioning recess, 64 positioning protrusion.

Claims

1. A seat on which the subject sits and which can be removed from the wheelchair; a seat base provided on the wheelchair and connectable to the seat while supporting the seat from below; A movable arm connected to the moving body; an arm base attached to the movable arm, the arm base being connectable to the seat while supporting the seat from below and capable of vertically passing by the seat base; a first locking mechanism that locks the connection between the seat base and the seating seat; a second locking mechanism that locks the connection between the arm base and the seat; Equipped with When the seat base descends relative to the arm base and passes the arm base, the seat is transferred from the seat base to the arm base, the first locking mechanism is released, and the second locking mechanism is activated. When the seat base rises relative to the arm base and passes the arm base, the seat is transferred from the arm base to the seat base, and the first locking mechanism is activated and the second locking mechanism is released. A sheet delivery structure characterized by:

2. The sheet delivery structure according to claim 1, The first locking mechanism and the second locking mechanism each include: an engaging member attached to the seat, the engaging member being movable between a locking position where it can engage with a target base and a releasing position where it is disengaged from the target base and is horizontally spaced from the locking position; a biasing member that biases the engaging member in a direction approaching the lock position; a pressure receiving portion that converts an upward force received from an untargeted base into a force in a direction approaching the release position and transmits the force to the engaging member; It is equipped with In the first locking mechanism, the target base is the seat base, and the non-target base is the arm base; In the second locking mechanism, the target base is the arm base, and the non-target base is the seat base. A sheet delivery structure characterized by:

3. The sheet transfer structure according to claim 2, The seat has a lock mounting hole, The engaging member is a retractable block that can move back and forth horizontally within the lock mounting hole; a clamping portion connected to the advancing / retreating block and vertically clamping the target base in cooperation with the seat at the release position; an insertion hole formed in the advancing / retreating block, into which a part of the non-target base can enter; and The pressure-receiving portion forms a part of the inner circumferential surface of the insertion hole, and is an inclined surface that is inclined in a direction approaching the lock position as it approaches the upper part. A sheet delivery structure characterized by:

4. The sheet transfer structure according to claim 3, The first locking mechanism and the second locking mechanism each further include: a positioning recess formed on a bottom surface of the seat, the positioning recess decreasing in diameter as it approaches an upper portion; a positioning protrusion protruding from the non-target base and tapering in diameter as it approaches the top; When the positioning protrusion enters the positioning recess, the non-target base is positioned relative to the insertion hole. A sheet delivery structure characterized by:

5. The sheet delivery structure according to claim 1, The seat has a seat surface portion that supports the buttocks of the subject and a backrest portion that supports the back of the subject, The movable arm can transport the seat connected to the arm base while the subject remains seated on the seat. A sheet delivery structure characterized by:

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