JP4148731B2 - Lifter device - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an improvement of a lifter device that expands and contracts a scissor link mechanism to raise and lower a lifting platform, for example.
[0002]
[Prior art]
As a conventional lifter device, for example, as disclosed in Japanese Patent No. 2959341 and Japanese Patent Application Laid-Open No. 7-109828, there is a device that uses a scissor link mechanism that supports a lift so as to be lifted and lowered with respect to a base.
[0003]
[Problems to be solved by the invention]
However, in such a conventional lifter device, when an inclined jack mechanism or the like that changes the inclination angle of the supported body is provided on the lifting platform, its overall height and weight increase, making it difficult to handle on site. There was a problem.
[0004]
The present invention has been made in view of the above-described problems, and an object thereof is to provide a lifter device that can be easily handled in the field.
[0005]
[Means for Solving the Problems]
The first invention is applied to a lifter device that includes a scissor link mechanism that supports the lift base so that the lift base can be raised and lowered with respect to the base, and link drive means that expands and contracts the scissor link mechanism to raise and lower the lift base.
[0006]
The scissor link mechanism includes links that cross each other, each support shaft that rotatably connects one end of each link to the base and the lift, and each of the other ends of the links that are in rolling contact with the base and the lift. and a roller, comprising a knuckle for swingably supporting the link to the axis of rotation of at least one roller, and a knuckle drive means for changing the inclination angle of the elevation frame is swung to the knuckle, knuckle rocking It was shall be connected to the rotation shaft of the roller to the moving tip.
[0007]
Operation and effect of the invention
In the first invention, the lifter device expands and contracts the scissor link mechanism to raise and lower the elevator, and swings the knuckle to change the inclination angle of the elevator. The lifter device has a structure in which a knuckle that changes the tilt angle of the lifting platform is provided between the link and the roller, so there is no need to provide a tilt jack mechanism that changes the tilt angle of the supported body on the lifting platform, and the overall height is suppressed. And an increase in weight is suppressed.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.
[0009]
As shown in FIGS. 1 and 2, the lifter device 1 mounts a base 21 fixed on a guide rail 2 installed on the ground or the like via a lever lock 3 or the like, various work machines, and heavy objects. The lift 22, the scissor link mechanism 31 that supports the lift 22 with respect to the base 21, and the two hydraulic cylinders (link driving means) that raise and lower the lift 22 by expanding and contracting the scissor link mechanism 31. 23.
[0010]
Each hydraulic cylinder 23 has a cylinder base end portion connected to each link 33 side via a support shaft 24, and a rod distal end portion connected to each link 32 side via a support shaft 25. When each hydraulic cylinder 23 is extended by the pressurized hydraulic oil supplied from the power unit 4, each link 32, 33 rises and the lifting platform 22 rises, while each hydraulic cylinder 23 contracts, The links 32 and 33 are tilted and the lifting platform 22 is lowered.
[0011]
The scissor link mechanism 31 includes two pairs of links 32 and 33 that intersect with each other, a support shaft 34 that rotatably connects the intersections of the links 32 and 33, and one end of each link 32 and 33 that moves up and down with the base 21. Support shafts 35 and 36 that are rotatably connected to the base 22, and rollers 37 and 38 that cause the other ends of the links 32 and 33 to rotationally contact the lifting base 22 and the base 21. When each hydraulic cylinder 23 is expanded and contracted, the crossing angle of each link 32, 33 is changed to expand and contract, and the lifting platform 22 is translated relative to the base 21.
[0012]
The lifter device 1 includes a knuckle mechanism 40 that changes an inclination angle of the lifting platform 22 with respect to the scissor link mechanism 31. This knuckle mechanism 40 includes a pair of knuckles 41 that are swingably connected to each link 32 via a support shaft 43, and a hydraulic cylinder (knuckle driving means) 42 that swings each knuckle 41. The rotating shaft 44 of each roller 37 is connected to the swinging tip portion of 41.
[0013]
Each hydraulic cylinder 42 has a base end portion connected to each link 32 side via a support shaft 45, and a rod end portion connected to each knuckle 41 side via a support shaft 46. As each hydraulic cylinder 42 is extended by the pressurized hydraulic fluid supplied from the power unit 4, each knuckle 41 rises, the rotary shaft 44 of each roller 37 is raised, and the lifting platform 22 becomes horizontal. On the other hand, when each hydraulic cylinder 42 is contracted, each knuckle 41 tilts, the rotating shaft 44 of each roller 37 is lowered, and the lifting platform 22 tilts.
[0014]
As described above, various work machines and heavy objects are placed on the lifting platform 22. The lifter device 1 holds the lifting platform 22 at an arbitrary inclination angle by swinging the knuckle 41 and moving the rotating shaft 44 of each roller 37 up and down.
[0015]
Since the lifter device 1 has a structure in which the knuckle 41 that changes the inclination angle of the lifting platform 22 via the knuckle 41 is provided between each link 32 and each roller 37, an inclination jack mechanism that changes the inclination angle of the lifting table 22 is provided. There is no need, the overall height can be suppressed, the increase in weight is suppressed, and handling on site is facilitated.
[0016]
The present invention is not limited to the above-described embodiment, and it is obvious that various modifications can be made within the scope of the technical idea.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of the present invention.
FIG. 2 is a side view of the same.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Lifter apparatus 21 Base 22 Lifting base 23 Hydraulic cylinder (link drive means)
31 Scissor link mechanism 32, 33 Link 37, 38 Roller 40 Knuckle mechanism 41 Knuckle 42 Hydraulic cylinder (knuckle drive means)

Claims (1)

In a lifter device comprising a scissor link mechanism that supports a lift so that the lift can be raised and lowered with respect to a base, and a link driving means that expands and contracts the scissor link mechanism to raise and lower the lift.
Said scissors linkage and links crossing each other, and support shafts that rotatably connected to one end of each link to the lifting table and the base, the lifting table and the other end of each link and the base and a respective roller for rolling contact on a knuckle that swingably supported with respect to the link axis of rotation of at least one of the rollers, knuckle drive for changing the inclination angle of the elevation frame is swung to the knuckle And a rotating shaft of the roller is connected to the rocking tip of the knuckle .

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