JP7161224B2 - Lifting trolley with moving device and moving device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a moving device that linearly moves a moving body by rotating the rotating body in a state where the rotating body and the moving body are engaged with each other, and an elevator car equipped with the moving device.

2. Description of the Related Art Conventionally, there has been known an elevating mechanism in which an elevating unit is screwed to an upright ball screw, and the rotational force of a motor is transmitted to the ball screw to rotate the ball screw and elevate the elevating unit. Reference 1).

In the lifting mechanism described in Patent Document 1, one end of a cantilever bar is fixed to an elevating section, and by lifting the elevating section while the person being assisted holds the cantilever bar, the person being assisted can It assists the rising motion.

Limit switches are provided at the top and bottom of this lifting mechanism, and when the lifting part reaches a position corresponding to the limit switch, the motor power is turned off, and the lifting part and the cantilever bar stop. It has a structure.

In the elevating mechanism described in Patent Document 1, the lower end of the ball screw is rotatably supported by the lower end side bearing portion, and the elevating portion supports a relatively lightweight cantilever bar. As for the position where the lifting part is stopped by the switch, even if the lifting part is stopped at a position away from the lower end side bearing part, the load on the ball screw and the screw part of the lifting part due to the weight of the cantilever bar is large. do not have. However, in the case where the lifting section always supports a heavy object, when the lifting mechanism is not in use, the lifting section can be lowered to the lowest end and stopped in contact with the lower end side bearing, thereby reducing the ball movement. The weight load on the screw and the threaded part of the lifting part is alleviated.

Therefore, it is conceivable to arrange the limit switch so that the limit switch detects the lifting section when the lifting section comes into contact with the end-side bearing.

JP 2019-143771 A

However, there is a slight amount of time from when the limit switch detects the lifting section until the motor stops driving, and the motor continues to rotate the ball screw even after the lifting section contacts the lower end bearing. However, there is a problem that a load is applied to the motor, the ball screw, and the threaded portion of the elevating portion.

In addition, considering the time from the detection by the limit switch to the stop of the motor, it is conceivable to adjust the detection position of the limit switch so that the limit switch detects before the lifting part contacts the lower end side bearing part. , there is variation in the time from the detection by the limit switch to the stop of the motor, etc., and this adjustment is not easy.

Therefore, the present invention solves the above problems, and even if the rotating body continues to rotate even after the moving body has moved to the end of its movement range and has come into contact with another member, the rotating body, It is an object of the present invention to provide a moving device capable of avoiding loads on a moving body, other members with which the moving body abuts, and a drive mechanism for rotationally driving a rotating body, and an elevator carriage equipped with the moving device.

A moving device according to the present invention includes a rotating body and a moving body, the rotating body having a plate-shaped first spiral portion, and the moving body having a plate-shaped second spiral portion. the interval of the first helical portion is formed larger than the plate thickness of each of the first helical portion and the second helical portion, and the interval of the second helical portion is , formed larger than the plate thickness of each of the first spiral portion and the second spiral portion, engages the first spiral portion and the second spiral portion, and rotates the rotating body is rotated to move the moving body.

When the moving body moves to at least one of one side range end and the other side range end of the moving range of the moving body, the engagement between the first spiral portion and the second spiral portion is released. 2. The moving device according to claim 1, characterized in that:

Further, the moving device according to the present invention is characterized in that the rotating body is a substantially cylindrical shaft member, and the moving body is an inserted member through which the shaft member is inserted.

Moreover, the moving device according to the present invention is characterized in that the second spiral portion is composed of discontinuous plate-like protrusions.

Further, an elevating carriage according to the present invention is an elevating carriage comprising a carriage body, a link mechanism, a workbench, and the moving device, wherein the link mechanism and the moving device are mounted on the upper surface of the carriage body. The workbench is disposed on the upper end of the link mechanism, the moving body is connected to the link mechanism, and the rotating body is rotated to move the moving body in the vertical direction. The link mechanism expands and contracts as the body moves, and the worktable rises and lowers as the link mechanism expands and contracts.

Further, in the elevator vehicle according to the present invention, the moving device is covered with a covering device, the moving body is connected to the link mechanism via the covering device, and the traveling power of the elevator vehicle and the rotational power of the rotating body are obtained. is electric power.

According to the present invention, when the rotating body continues to rotate even after the moving body has moved to the end of its movement range and has come into contact with another member, the rotating body, the moving body, and the other member with which the moving body has contacted Also, it is possible to avoid the load on the driving mechanism that rotates the rotating body.

1 is a perspective view of a traveling carriage of Example 1. FIG. 4 is a left side view of the traveling vehicle with the link mechanism of Example 1 extended. FIG. 4 is a left side view of the traveling vehicle with the link mechanism of Example 1 contracted. FIG. 4 is a plan view of the traveling carriage with the link mechanism of the first embodiment contracted; FIG. FIG. 4 is a front view of the traveling carriage in which the link mechanism of the first embodiment is contracted; 4 is a right side view of the traveling carriage showing the insides of the first cover body, the second cover body, the third cover body, the fourth cover body, and the support member with the link mechanism of the first embodiment contracted. FIG. 4 is a right side view of the traveling carriage showing the insides of the first cover body, the second cover body, the third cover body, the fourth cover body, and the support member in a state where the link mechanism of the first embodiment is extended; FIG. 4 is a front view of the shaft member of Example 1. FIG. 1 is a perspective view of an inserted member of Example 1. FIG. 4 is a perspective view of one side inserted member of Embodiment 1. FIG. 4 is a front view of the other side inserted member of Embodiment 1. FIG. 4 is a plan view of the inserted member of Example 1. FIG. FIG. 11 is a perspective view of one side inserted member of another embodiment; FIG. 4 is a vertical cross-sectional view of the shaft member, the inserted member, the first cover body, and the support member in the vicinity of the upper end of the first cover body according to the first embodiment; 4 is a vertical cross-sectional view of the shaft member, the inserted member, the first cover body, and the support member in the vicinity of the lower end of the first cover body according to the first embodiment; FIG.

Embodiments of the present invention will be described below with reference to the accompanying FIGS. 1 to 15. FIG. The examples described below do not limit the content of the claimed invention. Moreover, not all the configurations described below are essential requirements of the present invention.

1 to 7 show the lift truck 1 of this embodiment. The elevator truck 1 has a truck body 2, a link mechanism 3, a workbench 4, and a pair of elevators 5A and 5B.

The carriage body 2 is a so-called electric carriage, and includes a pair of left and right front wheels 11 for steering and a pair of left and right rear wheels 12 for driving. etc. can be performed. The carriage body 2 is provided with a battery (not shown) that serves as a power source for the hoist carriage 1. This battery supplies power for running the hoist carriage 1 and driving power for the hoisting devices 3A and 3B. In addition, at the rear portion 13 of the carriage body 2, an openable table 14 that can be rotated by 90° is provided, and as shown in FIGS. can be transported by

As shown mainly in FIGS. 2 and 7, the link mechanism 3 has a four-stage structure consisting of a first link 21, a second link 22, a third link 23, and a fourth link 24 in order from the bottom. The lower end of the first link 21 is attached to the lower mounting rail 25 and the upper end of the fourth link 24 is attached to the upper mounting rail 26 . The link mechanism 3 is attached to the carriage body 2 by fixing the lower mounting rail 25 to the upper surface portion 15 of the carriage body 2 , and the upper mounting rail 26 is fixed to the bottom surface portion 33 of the workbench 4 , so that the work can be performed. It is attached to the base 4. When the link mechanism 3 is raised, the workbench 4 is raised, and when the link mechanism 3 is folded, the workbench 4 is lowered.

The workbench 4 has a rectangular bottom plate portion 31 on which a worker who performs high-place work or the like rides, and pillars 32A, 32B, 32C, and 32D erected at the four corners thereof. A fall prevention fence (not shown) can be attached to the posts 32A, 32B, 32C, and 32D to prevent the worker from falling. An upper mounting rail 26 is fixed to the bottom surface portion 33 of the bottom plate portion 31 .

As shown mainly in FIG. 1, the lifting device 5A and the lifting device 5B are provided in a left and right pair on the upper surface portion 15 on the front side of the carriage body 2, but the lifting device 5A and the lifting device 5B have the same configuration and shape. , the lifting device 5A will be described below, and the description of the lifting device 5B will be omitted. The lifting device 5A includes a moving device including a shaft member 41 as a rotating body and an inserted member 51 as a moving body, and a covering device that covers the moving device and transmits the power of the moving device to the link mechanism 3. there is

As shown in FIG. 8 , the shaft member 41 includes a hollow cylindrical shaft body 42 , a plate-like spiral protrusion 43 spirally disposed on the outer surface of the shaft body 42 , and the carriage body 2 . It has an engaging portion 44 for stopping, a connecting portion 45 connected to the speed reducer 17 , and an anti-vibration member 46 provided at the upper end portion of the shaft body 42 . The helical protrusion 43 corresponds to the first helical portion of the present invention.

The spiral protrusion 43 is not provided in the predetermined range L1 of the lower portion of the anti-swaying member 46 and the predetermined range L2 of the upper portion of the locking portion 44 . The spiral protrusions 43 are provided to have a predetermined inclination angle θ, and the pitch P1, which is the interval between the adjacent spiral protrusions 43, is determined by the inclination angle θ. Note that the larger the outer diameter of the shaft body 42, the larger the pitch P1, and the smaller the outer diameter, the smaller the pitch P1. Therefore, the outer diameter of the shaft body 42 is also taken into consideration when determining the pitch P1. The plate thickness D1 of the spiral protrusion 43 can be selected according to the weight applied to the spiral protrusion 43 so as to have the strength to support the weight. All the pitches P1 are equal intervals, and are set larger than the plate thickness D1 of the spiral protrusion 43 and the plate thickness D2 of plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F, which will be described later.

Lower surface portions 60A, 60B, 60C, 60D, 60E, and 60F of plate-like projection portions 55A, 55B, 55C, 55D, 55E, and 55F, which will be described later, are in contact with the upper surface portion 47 of the spiral projection portion 43. Since the insertion member 51 slides, lubricating oil is used. Therefore, although not essential, a shallow groove (not shown) is formed in the upper surface portion 47 of the helical protrusion 43, lubricating oil is stored in this groove, and the lubricating oil is released when the inserted member 51 slides. You may make it supply to a contact part little by little from a groove part.

The locking portion 44 is locked to the upper surface portion 15 in a state in which the connecting portion 45 is inserted into the shaft insertion hole 16 drilled in the upper surface portion 15 of the carriage body 2 . The locking portion 44 is formed to have a larger diameter than the outer diameter of the shaft body 42 and the diameter of the shaft insertion hole 16 .

The connection portion 45 is connected to the speed reducer 17 , and the shaft member 41 rotates when the power of the shaft rotation motor 18 is transmitted to the connection portion 45 via the speed reducer 17 .

The anti-swaying member 46 is fixed to the upper end portion of the shaft body 42 and comes into contact with the inner surface of the first cover body 61, which will be described later. The outer diameter of the anti-swaying member 46 is slightly smaller than the inner diameter of the first cover body 61 but substantially the same. 41 is suppressed.

As shown in FIGS. 9 to 12, the member to be inserted 51 has a vertically elongated substantially rectangular parallelepiped shape, and a circular hole 52 extending through it in the longitudinal direction is formed. The inserted member 51 has a body portion 53 formed in a substantially rectangular tubular shape, and a plurality of plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F arranged on an inner surface portion 54 of the body portion 53. . The inserted member 51 of this embodiment is formed by joining one side inserted member 51A and the other side inserted member 51B. The joint surface 56A of the one-side inserted member 51A and the joint surface 56B of the other-side inserted member 51B overlap with the surface of the inserted member 51 passing through the diagonal line S.

The one-side inserted member 51A and the other-side inserted member 51B have the same shape, and the inserted member 51 is formed by turning one of them upside down and joining them. Three plate-like protrusions 55A, 55C, and 55E are formed on the inner surface portion 54A of the one-side inserted member 51A, and three plate-like protrusions 55B, 55D, and 55B are formed on the inner surface portion 54B of the other-side insertion member 51B. 55F is formed. The plate-like protrusions 55A, 55C, and 55E are arranged in parallel in the vertical direction. Plate-like projections 55B, 55D, and 55F are also arranged in parallel in the vertical direction.

Plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F as second spiral portions are provided so as to have the same inclination angle θ as that of spiral protrusion 43 . Adjacent plate-like protrusions 55A and plate-like protrusions 55C, plate-like protrusions 55C and plate-like protrusions 55E, plate-like protrusions 55B and plate-like protrusions 55D, plate-like protrusions 55D and plate-like protrusions 55F, is formed to be the same as the pitch P1 of the spiral protrusion 43 . The plate thickness D2 of the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F is the strength that can support the weight according to the weight added to the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F. can be selected. All the pitches P2 are equal intervals, and are set larger than the plate thickness D1 of the spiral protrusion 43 and the plate thickness D2 of the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F.

The plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F of this embodiment are formed in the inner surface portion 54 of the main body portion 53 so that the edge portion 57A on the side of the joint portion 56A of the member 51A to be inserted on one side and the edge portion 57A on the other It is not formed on the edge portion 57B on the joint portion 56B side of the member 51B. Therefore, when the one-side inserted member 51A and the other-side inserted member 51B are joined to form the inserted member 51, the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F are arranged in one spiral. However, there is a gap 58A between the plate-like protrusions 55A and 55B, a gap 58B between the plate-like protrusions 55B and 55C, and a gap between the plate-like protrusions 55C and 55D. A gap 58C is formed between them, a gap 58D is formed between the plate-like protrusion 55D and the plate-like protrusion 55E, and a gap 58E is formed between the plate-like protrusion 55E and the plate-like protrusion 55F. Plate-shaped protrusions 55A, 55B, 55C, 55D, 55E, and 55F are also formed on the edges 57A and 57B, and the plate-shaped protrusions 55A and 55B, and the plate-shaped protrusions 55B and 55B are formed. 55C, the plate-like protrusion 55C and the plate-like protrusion 55D, the plate-like protrusion 55D and the plate-like protrusion 55E, and the plate-like protrusion 55E and the plate-like protrusion 55F may be in contact with each other.

The inserted member 51 of this embodiment has a substantially rectangular parallelepiped outer shape corresponding to the shape of the first cover body 61, which will be described later. Other shapes are also possible.

The inserted member 51 of this embodiment is composed of one side inserted member 51A and the other side inserted member 51B, the joint surfaces 56A and 56B of which overlap with the plane of the inserted member 51 passing through the diagonal line S. , 56B of the outer edge 59A, outer edge 59B, outer edge 59C, and outer edge 59D (see FIG. 12) of the member 51 to be inserted pass through the midpoint C1 of the outer edge 59A and the midpoint C3 of the outer edge 59C. It may be joined so as to overlap, or may be joined so as to overlap a plane passing through the midpoint C2 of the outer side 59B and the midpoint C4 of the outer side 59D. At this time, three plate-like protrusions 55A, 55C, and 55E are formed on the inner surface portion 54A of the one-side inserted member 51A, and three plate-like protrusions 55B, 55D, and 55F are formed on the inner surface portion 54B of the other-side insertion member 51B. is formed. FIG. 13 shows another example of one side inserted member 51C before joining of the inserted member 51 that is joined on a plane passing through the midpoint C1 of the outer side 59A and the midpoint C3 of the outer side 59C. .

FIG. 14 shows a state in which the shaft member 41 is inserted into the inserted member 51, and the spiral protrusion 43 and the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F are engaged with each other. 43 and the lower surface portions 60A, 60B, 60C, 60D, 60E and 60F of the plate-like protrusions 55A, 55B, 55C, 55D, 55E and 55F are in contact with each other. When the shaft member 41 is rotated in one direction, the lower surface portions 60A, 60B, 60C, 60D, 60E, and 60F of the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F move toward the upper surface portion of the spiral protrusion 43. The inserted member 51 rises while maintaining the state of contact with the member 47 . When the shaft member 41 is rotated in the direction of the other side, the lower surface portions 60A, 60B, 60C, 60D, 60E, and 60F of the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F move toward the upper surface portion of the spiral protrusion 43. The member to be inserted 51 descends while maintaining the state of contact with the member 47 .

As shown in FIG. 7, the shaft member 41 has a connection portion 45 inserted into a shaft insertion hole 16 formed in the upper surface portion 15 of the truck body 2, and connected to a speed reducer 17 disposed inside the truck body 2. It is connected.

A first cover body 61 covers the shaft member 41 erected on the front portion of the carriage body 2 and engaged with the inserted member 51 . The first cover body 61 has a hollow prismatic shape with top and bottom openings. The upper end portion 62 of the first cover body 61 is located above the upper end portion 48 of the shaft member 41 . Therefore, the side surfaces of the shaft body 42 of the shaft member 41 and the inserted member 51 are completely covered with the first cover body 61 . A fixing plate 64 is attached to the lower end portion 63 of the first cover body 61 for fixing the first cover body 61 to the upper surface portion 15 of the carriage body 2 . Therefore, by fixing the fixing plate 64 to the upper surface portion 15 of the carriage body 2 , the first cover body 61 can be erected on the carriage body 2 .

A support member 66 that supports the second cover body 65 is attached to the upper side of the inserted member 51 . The support member 66 has a hollow prismatic shape. An upper end portion 67 of the support member 66 is fixed to the second cover body 65 . The support member 66 is formed thicker than the shaft member 41 and thinner than the first cover body 61 . Therefore, the support member 66 covers the shaft body 42 of the shaft member 41 together with the inserted member 51 when lowered.

The second cover body 65 has the shape of a hollow rectangular tube whose upper side is closed by a top plate 68 and whose lower side is open. An upper end portion 67 of the support member 66 is fixed to the top plate 68 . The second cover body 65 is formed thicker than the first cover body 61, covers the support member 66 when ascending, and covers the first cover body 61 when descending. The support member 66 is covered with the first cover body 61 when the inserted member 51 is lowered. An anti-vibration member (not shown) that contacts the outer surface of the first cover body 61 is provided inside the second cover body 65 and near the lower opening. The anti-swaying member suppresses the shaking of the second cover body 65 by coming into contact with the outer surface of the first cover body 61 when the second cover body 65 is stopped and moved.

The third cover body 69 has the shape of a hollow rectangular cylinder whose upper side is closed by a top plate 70 and whose lower side is open. The third cover body 69 is formed thicker than the second cover body 65 and covers the second cover body 65 when lowered. An anti-vibration member (not shown) that contacts the outer surface of the second cover body 65 is provided inside the third cover body 69 and near the lower opening. The anti-swaying member suppresses the shaking of the third cover body 69 by coming into contact with the outer surface of the second cover body 65 when the third cover body 69 is stopped and moved.

The fourth cover body 71 has a hollow prismatic shape with an upper side closed by a top plate 72 and a lower side opened. The fourth cover body 71 is formed thicker than the third cover body 69 and covers the third cover body 69 when lowered. A pair of connecting bodies 73 connected to the connecting shafts 27 of the third link 23 and the fourth link 24 are fixed to the lower part of the fourth cover body 71 . An anti-vibration member (not shown) that contacts the outer surface of the third cover body 69 is provided inside the fourth cover body 71 and near the lower opening. The anti-swaying member suppresses the shaking of the fourth cover body 71 by coming into contact with the outer surface of the third cover body 69 when the fourth cover body 71 is stopped and moved.

Two sprockets 74 are rotatably provided on the top surface of the top plate 68 of the second cover body 65 . A roller chain 75 is meshed with the sprocket 74 . One end 76 of the roller chain 75 is fixed to the upper portion of the first cover body 61 , and the other end 77 is fixed to the lower portion of the third cover body 69 .

Two sprockets 78 are rotatably provided on the top surface of the top plate 70 of the third cover body 69 . A roller chain 79 is meshed with the sprocket 78 . One side end 80 of the roller chain 79 is fixed to the upper part of the second cover body 65 , and the other side end part 81 is fixed to the lower part of the fourth cover body 71 .

Here, the operation of the lifting devices 5A and 5B will be described. When the shaft member 41 is rotated by driving the shaft rotation motor 18 provided inside the carriage body 2 from the state in which the link mechanism 3 shown in FIG. By rising, the support member 66 pushes up the second cover body 65 . As the second cover body 65 rises, the one side end 76 side of the roller chain 75 is gradually lengthened with the sprocket 74 as a reference, and the other side end 77 side is gradually shortened. rises together with the second cover body 65 . As the third cover body 69 rises, the one side end 80 side of the roller chain 79 is gradually lengthened with the sprocket 78 as a reference, and the other side end 81 side is gradually shortened. Body 71 rises together with third cover body 69 . In other words, the second cover body 65, the support member 66, the third cover body 69, and the fourth cover body 71 are raised at the same time as the inserted member 51 is raised. Further, since the fourth cover body 71 is connected to the link mechanism 3 via the connection body 73, the link mechanism 3 is lifted upward by the upward movement of the fourth cover body 71, and the link mechanism 3 is in the extended state. becomes.

As shown in FIG. 14, a limit switch 82 is provided inside the first cover body 61 near the upper end portion 62. When the upper contact portion 83 provided on the inserted member 51 contacts the limit switch 82, The drive of the shaft rotation motor 18 is stopped, and when the drive of the shaft rotation motor 18 is stopped, the movement of the inserted member 51 is stopped. The position where the inserted member 51 stops is the uppermost position of the inserted member 51 . The link mechanism 3 is designed to be in the most extended state when the inserted member 51 is at the uppermost position. Since the spiral protrusion 43 is not provided above the upper terminal end 49 of the spiral protrusion 43, the drive of the shaft rotation motor 18 may not be stopped due to, for example, a failure of the limit switch 82. However, the inserted member 51 does not rise any further. Further, the position where the limit switch 82 is arranged can be changed as appropriate, and the member to be inserted 51 may directly contact the upper contact portion 83 without providing the upper contact portion 83 .

When the shaft rotation motor 18 is driven to rotate in the opposite direction to the upward movement from the fully extended state of the link mechanism 3 shown in FIG. The second cover body 65 descends. As the second cover body 65 descends, the one side end portion 76 side of the roller chain 75 gradually becomes shorter with the sprocket 74 as a reference, and the other side end portion 77 side gradually becomes longer. descends together with the second cover body 65 . Further, as the third cover body 69 descends, the one side end 80 side of the roller chain 79 is gradually shortened with the sprocket 78 as a reference, and the other side end 81 side is gradually lengthened. The body 71 descends together with the third cover body 69 . That is, when the inserted member 51 descends, the second cover body 65, the support member 66, the third cover body 69, and the fourth cover body 71 descend simultaneously. Further, since the fourth cover body 71 is connected to the link mechanism 3 via the connecting body 73, the link mechanism 3 is pulled downward by the downward movement of the fourth cover body 71, and the link mechanism 3 is contracted. becomes.

As shown in FIG. 15, a limit switch 85 is provided in the vicinity of the lower end portion 84 of the first cover body 61. When the lower contact portion 86 provided on the inserted member 51 contacts the limit switch 85, , the drive of the shaft rotation motor 18 is stopped, and when the drive of the shaft rotation motor 18 is stopped, the movement of the inserted member 51 is stopped. The limit switch 85 is arranged so that the member to be inserted 51 comes into contact with the upper surface of the locking portion 44 of the shaft member 41 . Therefore, the position where the inserted member 51 contacts the upper surface of the locking portion 44 is the lowest position of the inserted member 51 . The link mechanism 3 is designed to be in the most contracted state when the inserted member 51 is at the lowest position. As shown in FIG. 6, when the inserted member 51 is at the lowest position, the second cover body 65, the third cover body 69 and the fourth cover body 71 are arranged so as not to contact the mounting plate 64 and the carriage body 2. It has become. The position where the limit switch 82 is arranged can be changed as appropriate, and the inserted member 51 may come into direct contact without providing the lower contact portion 86 .

In this embodiment, the movement range of the inserted member 51 is from the highest position to the lowest position of the inserted member 51, the highest position being the one side range end and the lowest position being the other side range end.

When the inserted member 51 descends, the lower surfaces 60A, 60B, 60C, 60D, 60E, 60F, and 60G of the plate-like projections 55A, 55B, 55C, 55D, 55E, and 55F are aligned with the upper surfaces 47 of the spiral projections 43. is maintained in contact with the In this embodiment, when the inserted member 51 is in contact with the upper surface of the locking portion 44, the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F are separated from the spiral protrusion 43, The spiral protrusions 43 and the plate-like protrusions 55A are arranged so that the spiral protrusions 55A, 55B, 55C, 55D, 55E, and 55F are positioned in the space M between the vertically adjacent spiral protrusions 43 and are in a non-contact state. , 55B, 55C, 55D, 55E, 55F are designed. Therefore, even if the shaft member 41 continues to rotate after the inserted member 51 descends to the lowest position and comes into contact with the upper surface of the locking portion 44 , the inserted member 51 does not move downward with respect to the inserted member 51 . power is not added. That is, it becomes an idle state. In this embodiment, the lower contact portion 86 contacts the limit switch 85 when the inserted member 51 abuts against the locking portion 44, the shaft rotation motor 18 stops driving, and the shaft member 41 rotates. Although it takes a short time t for the shaft member 41 to stop completely, even if the shaft member 41 continues to rotate during the time t, no power is applied from the shaft member 41 to the inserted member 51. Therefore, the shaft rotation motor 18 Since no drag is applied to the shaft rotating motor 18, the shaft member 41, the locking portion 44, and the inserted member 51, it is possible to avoid a load and prevent failures.

The moving device of this embodiment includes a shaft member 41 , an inserted member 51 , a reduction gear 17 and a shaft rotation motor 18 . In addition, the coating device of this embodiment includes a first cover body 61, a second cover body 65, a support member 66, a top plate 68, a third cover body 69, a top plate 70, a fourth cover body 71, a top plate 72, It is composed of a connecting body 73 , a sprocket 74 , a roller chain 75 , a sprocket 78 and a roller chain 79 .

As described above, the moving device of the present embodiment includes the shaft member 41 and the inserted member 51. The shaft member 41 has the plate-like spiral protrusion 43, and the inserted member 51 has a plate-like shape. plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F, and the pitch P1 of the spiral protrusion 43 is equal to that of the spiral protrusion 43 and the plate-like protrusions 55A, 55B, 55C, 55D, 55E, The pitch P2 of the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F is greater than the plate thicknesses D1 and D2 of the plate-like protrusions 55F and 55F. , 55D, 55E, and 55F are formed to be larger than the plate thicknesses D1 and D2, respectively. The inserted member 51 is moved by rotating it. Therefore, the inserted member 51 moves due to the rotation of the shaft member 41, and the inserted member 51 comes into contact with the locking portion 44, so that the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F are adjacent to each other in a spiral shape. It is located in the space M between the projections 43, and can be in a state in which the spiral projections 43 and the plate-shaped projections 55A, 55B, 55C, 55D, 55E, and 55F are disengaged.

Further, in the moving device of the present embodiment, when the inserted member 51 moves to at least one of the one side range end and the other side range end of the movement range of the inserted member 51, the helical protrusion 43 and the plate-like protrusion 55A. , 55B, 55C, 55D, 55E and 55F are released. That is, when the inserted member 51 moves to one side range end (uppermost position) of the movement range and comes into contact with the locking portion 44, the spiral protrusion 43 and the plate-like protrusions 55A, 55B, 55C, 55D, 55A, 55B, 55C, 55D, The engagement with 55E and 55F is released, and unnecessary load on the shaft rotation motor 18, the shaft member 41, the locking portion 44 and the inserted member 51 can be avoided.

In the moving device of this embodiment, the rotating body is the substantially cylindrical shaft member 41 and the moving body is the inserted member 51 through which the shaft member 41 is inserted. By inserting the shaft member 41 and the member to be inserted 51 into engagement, the mechanism for moving the member to be inserted 51 can be simplified.

Further, in the moving device of the present embodiment, the plate-like protrusions 55A, 55B, 55C, 55D, 55E, and 55F are formed of discontinuous plate-like protrusions, so that the one-side insertion member 51A and the other-side insertion member When 51B is mold-molded, it becomes easy to release from the mold.

The elevator truck 1 of the present embodiment includes a truck body 2 , a link mechanism 3 , a workbench 4 , and a moving device. A workbench 4 is provided at the upper end of the link mechanism 3, and a shaft member 41 is connected to the link mechanism 3. By rotating the shaft member 41, the inserted member 51 moves vertically. As the member to be inserted 51 moves, the link mechanism 3 expands and contracts, and the workbench 4 rises and lowers as the link mechanism 3 expands and contracts. Thus, the link mechanism 3 can be expanded and contracted, and the workbench 4 can be raised and lowered stably.

Further, in the lift truck 1 of the present embodiment, the moving device is covered with a covering device, the shaft member 41 is connected to the link mechanism 3 via the covering device, and the traveling power of the lift truck 1 and the rotational power of the shaft member 41 are Electricity. Therefore, the lubricating oil applied to the engaging portion between the shaft member 41 and the inserted member 51 by the coating device can be prevented from leaking to the outside. In addition, since no hydraulic device is used to raise and lower the inserted member 51, the elevator carriage 1 can be used in a clean room where oil leakage is strictly prohibited, a place where food is handled, or the like. Further, the link mechanism 3 can be expanded and contracted as the covering device is raised and lowered.

It should be noted that the present invention is not limited to the above embodiments, and various modifications can be made within the scope of the gist of the present invention. For example, in the first embodiment, the shaft member 41 is erected in a vertical direction with respect to the upper surface portion 15 of the carriage body 2, and the inserted member 51 is vertically moved. The shaft member 41 may be arranged so that the horizontal direction is the longitudinal direction, and the inserted member 51 may be moved in the horizontal direction. Alternatively, the shaft member 41 may be rotatably held in an inclined state, and the inserted member 51 may be moved in the inclined direction.

Although the two lifting devices 5A and 5B are used in the first embodiment, either one of the lifting device 5A and the lifting device 5B may be used. Also, more than three lifting devices may be used.

1 lifting truck 2 truck main body 3 link mechanism 4 workbench 15 upper surface portion 41 shaft member (rotating body)
43 Spiral protrusion (first spiral part)
51 inserted member (moving body)
55A Plate-like protrusion (second spiral portion)
55B plate-like protrusion (second spiral part)
55C plate-like protrusion (second spiral part)
55D plate-like protrusion (second spiral part)
55E plate-like protrusion (second spiral part)
55F plate-like protrusion (second spiral part)
D1 plate thickness D2 plate thickness P1 pitch (interval between first spiral parts)
P2 pitch (spacing of the second spiral part)

Claims (6)

comprising a rotating body and a moving body,
The rotating body has a plate-like first spiral portion,
The moving body has a plate-like second spiral portion,
The interval between the first helical portions is formed to be larger than the plate thickness of each of the first helical portion and the second helical portion,
The interval between the second spiral portions is formed larger than the plate thickness of each of the first spiral portion and the second spiral portion,
A moving device, wherein the movable body is moved by engaging the first helical portion and the second helical portion and rotating the rotating body. When the moving body moves to at least one of one side range end and the other side range end of the moving range of the moving body, the engagement between the first spiral portion and the second spiral portion is released. 2. The moving device according to claim 1, characterized in that: 3. The moving device according to claim 1, wherein the rotating body is a substantially cylindrical shaft member, and the moving body is an inserted member through which the shaft member is inserted. The moving device according to any one of claims 1 to 3, wherein the second spiral portion is composed of discontinuous plate-like protrusions. A lifting carriage comprising a carriage body, a link mechanism, a workbench, and the moving device according to any one of claims 1 to 4,
The link mechanism and the moving device are arranged on the upper surface of the carriage body,
The workbench is arranged at the upper end of the link mechanism,
The moving body is connected to the link mechanism,
By rotating the rotating body, the moving body moves vertically,
The link mechanism expands and contracts as the moving body moves,
An elevating carriage characterized in that the work platform is elevated as the link mechanism expands and contracts. the moving device is coated with a coating device;
the movable body is connected to the link mechanism via the covering device;
6. The lift truck according to claim 5, wherein the driving power of the lift truck and the rotation power of the rotor are electric power.

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