JP5778894B2 - lift device - Google Patents

Description

The present invention relates to a lifting device that lifts and lowers an object .

  2. Description of the Related Art Conventionally, lift devices having various configurations such as a lift device using a link, a screw drive lift device, and a mechanical jack lift device are known.

  Among such lifting devices, there is a lifting device disclosed in Japanese Patent Application Laid-Open No. 2006-21927 having a mechanism for transmitting power to a swing arm shaft through a gear.

JP 2006-21927 A

  In the lifting device disclosed in Japanese Patent Application Laid-Open No. 2006-21927, the durability of the gear is required in order to achieve stable lifting over a long period of time. Therefore, in order to improve the durability of the gear, there is a problem that it is necessary to perform heat treatment such as carburizing and quenching. There is also a possibility that the environmental load increases due to CO2 that must be discharged by such heat treatment.

In view of the above, an object of the present invention is to provide an elevating device that can realize stable elevating over a long period of time without using a gear.

In order to solve the above-described problem, the lifting device according to claim 1 is a cam member in which a part of the upper end surface of the cylinder is a cam surface, and is rotatable about the axis of the cylinder, and the cam A driven member having a main body disposed inside the cylinder of the member and a follower extending radially from the main body and contacting the cam surface, and when the driven member is at the lowest position, the main body of the driven member Is housed inside a rotatable cylinder that is a cam member.

  According to the lifting and lowering device of the first aspect, it is possible to realize stable lifting and lowering over a long period of time without using a gear with a configuration including a cam member and a driven member.

Further, since the main body of the driven member is arranged inside the rotatable cylinder that is the cam member , when the driven member is at the lowest position, the main body of the driven member is the cam member . It will be in the state accommodated inside the rotatable cylinder. Therefore, the overall height of the lifting device when the driven member is at the lowest position can be reduced.

Furthermore, since the main body of the driven member is arranged inside the rotatable cylinder that is the cam member , the space occupied when installing the lifting device can be reduced.

  According to a second aspect of the present invention, the lifting device includes a guide mechanism that guides the driven member in the lifting direction.

  According to the lifting and lowering device of the second aspect, the lifting and lowering device according to the first aspect operates in the same manner and the driven member is stabilized by the guide mechanism.

Lifting device as claimed in claim 3, in lifting apparatus according to claim 1 or 2, the center of gravity of the center and the sub rotary members of a circle is a cross section of the cam member is in the same position when viewed.

According to the lifting device of the third aspect, the same function as the lifting device according to the first or second aspect is achieved, and the center of the circle which is a cross section of the cam member is the rotation center of the cam member. by the center of gravity of the main body of the rotation center and the sub rotary members of the members are in the same position when viewed, enabling stable lifting.

  The lifting device according to a fourth aspect is the lifting device according to any one of the first to third aspects, wherein the upper end surface of the cylindrical body has a shape in which a cam surface having a start point and an end point is repeated a plurality of times. The follower member has the same number of followers as the number of repetitions of the cam surface, and one follower comes into contact with one cam surface.

  According to the lifting and lowering device of the fourth aspect of the present invention, since it operates in the same manner as the lifting and lowering device according to any one of the first to third aspects, the follower of the driven member is in contact with the cam surface. The load of the member can be distributed to a plurality of followers, and stable lifting can be achieved.

  Further, the load of the driven member can be distributed to the plurality of followers, and the wear of the cam surface and the follower can be reduced by the fact that one follower comes into contact with one cam surface.

  The lifting device according to claim 5 is the lifting device according to claim 4, wherein the start points of the plurality of cam surfaces are 360 degrees around the center of a circle that is a cross section of the cam member in a top view. The plurality of followers are provided so as to extend from the main body for each angle around the center of gravity of the driven member when viewed from above.

  According to the lifting device of the fifth aspect, the angle obtained by dividing 360 degrees by the number of repetitions of the cam surface is the same as the lifting device according to the fourth aspect. It can be moved up and down by rotating the cam member by that amount.

  According to the invention of any one of claims 1 to 5, a product composed of a cam member and a driven member can be manufactured for a long period of time without using a gear, and a product with a low environmental load can be manufactured. can do.

It is a perspective view of the raising / lowering apparatus of one Embodiment of this invention. It is a perspective view of the raising / lowering apparatus of one Embodiment of this invention, and shows the state which the cam member rotated from the state of FIG. It is a perspective view of the raising / lowering apparatus of one Embodiment of this invention, and shows the state which the cam member rotated further from the state of FIG.

  Hereinafter, an elevator apparatus 1 according to an embodiment of the present invention will be described with reference to the drawings.

  The lifting device 1 includes a base 11, a cam member 2 that is rotatably provided on the base 11, and a driven member 3 that can be lifted and lowered by the rotation of the cam member 2.

  The base 11 is provided with guide rails 12 and 12 in which a guide 36 of the driven member 3 described later is loosely fitted. The guide rails 12 and 12 are erected in the ascending / descending direction of the driven member 3. The guide rails 12 and 12 and a guide 36 described later serve as a guide mechanism for guiding the driven member 3 in the up-and-down direction.

  The cam member 2 is a cylindrical body 21 having a circular cross section, and is rotatable around the axis of the cylindrical body 21. In the cam member 2, a part of the upper end surface of the cylindrical body 21 is a cam surface 22, 23, 24, 25.

  The upper end surface of the cylindrical body 21 has a shape in which cam surfaces 22 to 25 having the same shape are repeated four times. Each cam surface 22-25 has start points 22a-25a and end points 22b-25b. The starting points 22a to 25a are positioned around every 90 degrees that is an angle obtained by dividing 360 degrees by 4 that is the number of repetitions of the cam surfaces 22 to 25 around the center of a circle that is a cross section of the cam member 2 in a top view. It has become.

  In each of the cam surfaces 22 to 25, the inclined surface is between the start point 22a and the end point 22b, between the start point 23a and the end point 23b, between the start point 24a and the end point 24b, and between the start point 25a and the end point 25b. ing. Between the start point 22a of the cam surface 22 and the end point 25b of the cam surface 25, between the start point 23a of the cam surface 23 and the end point 22b of the cam surface 22, and between the start point 24a of the cam surface 24 and the end point 23b of the cam surface 23. A rising portion 26 is formed between the start point 25 a of the cam surface 25 and the end point 24 b of the cam surface 24.

  The driven member 3 includes a main body 31 disposed inside the cylindrical body 21 of the cam member 2 and followers 32, 33, 34, and 35 extending radially from the main body 31 (the followers 34 and 35 are visible because they are perspective views). And guides 36 and 36 for guiding the main body 31 in the up-and-down direction.

The center of gravity of the sub rotary members 3 circles is a cross section of the cam member 2 is in the same position when viewed. Therefore, the radial direction from the center of gravity of the driven member 3 coincides with the radial direction of the circle which is a cross section of the cam member 2 in a top view.

  The number of followers 32 to 35 is the same as the number of cam surfaces 22 to 25, and one follower is in contact with each cam surface. Although not visible in the perspective view, the follower 34 is in contact with the cam surface 24, and the follower 35 is in contact with the cam surface 25. The followers 32 to 35 are provided so as to extend from the main body 31 every 90 degrees around the center of gravity of the driven member 3 in a top view.

  The followers 32 to 35 are roller followers, and the rotation axes of the roller followers coincide with the radial direction from the center of gravity of the driven member 3 in a top view.

  The guide 36 is rotated around the plate portion 36b at a position sandwiching the guide rail 12 between the arm portion 36a extending from the main body 31 toward the above-described guide rail 12, the plate portion 36b provided at the tip of the arm portion 36a. Two guide rollers 36c provided so as to be movable (in the guide 36 on the right side as viewed in the figure, one of the guide rollers 36c is visible but the other is not visible because of a perspective view, and in the guide 36 on the left side as viewed in the figure) Both guide rollers are not visible). When the two guide rollers 36 c sandwich the guide rail 12, the guide 36 of the driven member 3 is loosely fitted to the guide rail 12.

  Hereinafter, the lifting operation of the lifting device 1 will be described.

  First, an operation for raising the driven member 3 will be described. In FIG. 1, the followers 32 to 35 are positioned in the vicinity of the start points of the cam surfaces 22 to 25, respectively. When the cam member 2 rotates in the clockwise direction from the state of FIG. 1, the followers 32 to 35 always come into contact with the inclined surfaces of the cam surfaces 22 to 25 by the weight of the driven member 3, while the followers 32 to 35 are connected to the cam surfaces 22 to 25. The position in contact with 25 will change. The followers 32 to 35 are pushed up by the inclined surfaces of the cam surfaces 22 to 25, and the entire follower member 3 is raised to the state shown in FIG. When the cam member 2 further rotates in the clockwise direction from the state of FIG. 2, the followers 32 to 35 reach the end points 22b to 25b of the cam surfaces 22 to 25, respectively, and the driven member 3 as a whole rises. It becomes. As the cam member 2 stops rotating, the driven member 3 stops rising.

  Next, an operation for lowering the driven member 3 will be described. When the cam member 2 rotates counterclockwise from the state of FIG. 3, the followers 32 to 35 always come into contact with the inclined surfaces of the cam surfaces 22 to 25 due to the weight of the driven member 3, while the followers 32 to 35 move to the cam surfaces 22 to 25. The position in contact with 25 will change. The followers 32 to 35 follow the inclined surfaces of the cam surfaces 22 to 25 and descend, and the entire driven member 3 descends to the state shown in FIG. When the cam member 2 further rotates counterclockwise from the state of FIG. 2, the followers 32 to 35 reach the vicinity of the start points 22a to 25a of the cam surfaces 22 to 25, respectively, and the driven member 3 as a whole is lowered. It becomes the state of.

  The present invention is capable of moving up and down with a pair of cam members and driven members. In a mechanism having a plurality of sets of cams and driven members, it is necessary to synchronize the rotation of the cams. However, since the present invention does not need to synchronize, it is possible to reduce the number of parts necessary for synchronization or to require electrical control. do not do.

  Further, according to the present invention, since the driven member is moved up and down along the inclination of the cam surface, it is possible to move up and down even with a power source having a small output as compared with a lifting device using, for example, a rack and a pinion, thereby realizing energy saving. Furthermore, the present invention can lift and lower a heavier object than a lifting device using, for example, a rack and a pinion as long as the power source has the same output.

  In the said embodiment, although the upper end surface of the cylinder 21 demonstrated the case where the same shape cam surface 22,23,24,25 became the shape repeated 4 times, it is not limited to this, The number of times that the cam surface having the same shape is repeated four times may be a plurality of times other than four times, such as two times, three times, and five times.

  In the above embodiment, the case where the rising portions 26 are formed between the start point 22a of the cam surface 22 and the end point 25b of the cam surface 25 in the adjacent cam surfaces, for example, the cam surface 22 and the cam surface 25 has been described. However, the present invention is not limited to this, and an inclined surface may be provided between the start point of one cam surface and the end point of the other cam surface.

  Further, a stopper or the like for restricting the movement of the follower may be provided in the vicinity of the start point and the end point of the cam surface.

  Although the case where the followers 32 to 35 are roller followers has been described in the above embodiment, the present invention is not limited thereto, and may be a flat or curved contact.

  In the above-described embodiment, the case where the guide 36 and the guide rail 12 are two sets has been described. It may be individual.

  In the above embodiment, the guide rail 12 is outside the cam member 2 in the drawing, but the guide rail 12 is not limited to this and may be provided inside the cam member 2.

  In the above embodiment, the case where the guide mechanism is composed of the guide 36 and the guide rail 12 has been described. However, the present invention is not limited to this, and for example, a hole is formed in the main body of the driven member, and the guide rod passes through the hole. The driven member may be guided by another guide mechanism such as that provided.

DESCRIPTION OF SYMBOLS 1 Lifting device 2 Cam member 3 Follower member 11 Base 12 Guide rail 21 Cylindrical body 22-25 Cam surface 22a-25a Start point 22b-25b End point 26 Rising part 31 Main body 32-34 Follower 36 Guide 36a Arm part 36b Plate part 36c Guide roller

Claims (5)

A cylindrical member having a circular cross section, a part of the upper end surface of the cylindrical member is a cam surface, and a cam member that is rotatable about an axis of the cylindrical member;
A driven member having a main body disposed inside the cylindrical body of the cam member and a follower extending radially from the main body and contacting the cam surface;
An elevating apparatus characterized in that when the driven member is at the lowest position, the main body of the driven member is housed inside a rotatable cylinder that is a cam member.   The lifting device according to claim 1, further comprising a guide mechanism that guides the driven member in a lifting direction. Lifting apparatus according to claim 1 or 2 and the center of gravity of the center and the sub rotary members of a circle is a cross-section of said cam member is characterized in that it is in the same position when viewed. The upper end surface of the cylindrical body has a shape in which a cam surface having a start point and an end point is repeated a plurality of times,
The driven member has the same number of followers as the number of repetitions of the cam surface,
The lifting device according to any one of claims 1 to 3, wherein one follower is in contact with one cam surface. The start points of the plurality of cam surfaces are positioned around the center of a circle that is a cross section of the cam member in a top view at every angle obtained by dividing 360 degrees by the number of repetitions of the cam surface,
The lifting device according to claim 4, wherein the plurality of followers are provided so as to extend from the main body at each angle around the center of gravity of the driven member in a top view.

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