JPS63282098A - Elevator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a lifting device used as an elevated work platform or the like.

[Conventional technology and its problems]

2. Description of the Related Art Hydraulic lifting devices called lifters have conventionally been used to move goods up and down and to lift and lower workers for work at high places.

FIG. 3 shows a conventional lifting device, and the lifting device 50 includes a base 51, a rage tong mechanism 52 rotatably connected to the base 51 by a connecting shaft 59, and an upper end of the rage tong mechanism 52. It consists of a table 53 rotatably connected by a connecting shaft 58 and a hydraulic cylinder 54 for raising and lowering the table 53.

The hydraulic cylinder 54 has a rear end portion of its cylinder body 55 rotatably connected to a proper position of the rage tongue mechanism 52, and a tip of a piston rod 56 connected to the rage tongue mechanism 52.
The second arm 52a is rotatably connected to the central proper position by a connecting shaft 57.

This elevating device 50 is moved by rollers 60 and 61 provided at the lower and upper ends of the rage tong mechanism 52 as the rage tong mechanism 52 expands and contracts due to the expansion and contraction of the hydraulic cylinder 54.
rolls on the upper surface of the base 51 or the lower surface of the table 53, and the table 53 moves up and down while maintaining a state parallel to the base 51.

However, according to this conventional lifting device 50, the table 5
3 is supported only by the connecting shaft 58 and the rollers 60, there is a problem that the table 53 is easily bent by the load W applied to the table 53. In particular, table 5
In the lowered position of No. 3, the roller 60 comes to the edge of the table 53, so the center of the table 53 is deflected greatly, and in the raised position of the table 53, the roller 60 comes near the center of the table 53, so the table 53 receives the load W2. The table 53 is supported on one side, and the side opposite to the connecting shaft 58 has a large deflection.Also, the roller 60 moves greatly with the lifting and lowering movement, and the support point of the table 53 is at the center of gravity (center position).
, the table 53 swings thickly (stability is poor, and a large bending stress is also applied to the arm 52a, so the table 53, arm 52a, roller 6
0,61 and the connecting shafts 58, 59, etc., there is a problem that the weight increases and the size increases.

[Technical means for solving the problems] In view of the above-mentioned problems, the present invention provides a stable lifting device in which the number of support points of the table is increased and the movement of the support points is reduced so that the table is less deflected. The technical means for this purpose are a base, a table, a rage tong mechanism that is located between the base and the table and supports the table so as to be able to move up and down, and a fluid pressure that drives the rage tong mechanism to expand and contract. In the elevating device having a cylinder, the tong mechanism includes a tong member in which two arms are rotatably connected to each other in an X-shape by a connecting shaft at the center of each arm, and two arms of the tong member. Auxiliary arms are rotatably connected by a connecting shaft to the center of each of the upper side and the lower side of the two. and is rotatably connected to the lower center surface of the table or the upper center surface of the base, and rollers provided at the upper and lower ends of the arm of the tong member are connected to the table. It is characterized in that it is configured to roll on the lower surface of the base or the upper surface of the base.

[For production]

Since the tip of the auxiliary arm is rotatably connected to the central lower surface of the table by the connecting shaft, the central portion of the table is always supported regardless of the expansion and contraction of the rage tong mechanism. As the rage tong mechanism expands and contracts, rollers provided at the upper and lower ends of the arm roll on the lower surface of the table or the upper surface of the base, and the support point of the table changes within half of the table.

〔Example〕

Embodiments of the present invention will be described below based on the drawings.

In FIGS. 1 and 2, the lifting device A consists of a base 1, a table 2, a rage tong mechanism 3, and four hydraulic cylinders 4.4, 5.5.

The base l includes a frame 10, a support stand 11 and a placket 12 attached to the center of the frame 10, and a frame lO.
It consists of a support stand 13.13 and a guide frame 14.14 attached to both ends. The support stands 11.13 are for supporting the table 2 when it is at the lowest position, and the guide frame 14 is for the groove 1 formed thereby.
5 is for rolling a roller 33, which will be described later.

The table 2 includes a table body 16 made of a frame made of shaped steel or the like and a striped steel plate pasted thereon, a handrail 17 provided around the top surface of the table body 16, a guide frame 18, 18 similar to the guide frame 14 described above, Guide roller 20 that rolls against surrounding structures at the highest position of table 2
．． 20, and a bracket 21 provided on the lower center surface of the table body 16.

A roller 34, which will be described later, rolls within the groove 19 formed by the guide frame 18.

The rage tong mechanism 3 includes a tongue member 22 formed in an X-shape by rotatably connecting the centers of two arms 23 and 24 to each other with a connecting shaft 31, two upper sides of the arms 23 and 24, and two Connecting shafts 29, 2 are located at the center of the lower side of the
The upper auxiliary arm 2 has auxiliary arms 25, 26, 27, 28 rotatably connected by
5.26 and the lower auxiliary arms 27 and 28 are rotatably connected at their respective tips by a connecting shaft 30.35, and are attached to the center of the table 2 and the base 1, respectively, by the aforementioned bracket 21.12. Rotatably connected.

The upper and lower ends of each arm 23.24 are provided with rollers 33.33, 34.34 that roll in contact with the lower surface of the table 2 or the upper surface of the base 1 within the aforementioned groove 19.15. ing.

Hydraulic cylinders 4, 4 and hydraulic cylinders 5.5 are 2 pieces 1
A support bracket is attached to the rear end of each cylinder body 37 and the tip of the piston rod 38 as a set) 40.39
The bracket 40 on the side of the cylinder body 37 is attached below the arm 24.23, and the bracket 39 on the side of the piston rod 38 is attached slightly above the connecting shaft 31 of the arms 24, 23. 3
6, each is rotatably attached. Also,
A hose (not shown) is connected to the oil supply ports of the hydraulic cylinders 4, 5, so that pressure oil is supplied from a hydraulic unit (not shown).

In the lifting device A configured as described above, the base 1 is housed in the bit P provided on the floor surface G, and the lifting device A is placed in the highest position (the first
For example, in the state indicated by the solid line in the figure), the table 2 is at the same level as the second floor, and in the lowest position (state B, indicated by the chain line in Fig. 1), the table 2 is at the same level as the floor G. It is set up in such a way.

In the above-mentioned lifting device A, when the hydraulic cylinders 4 and 5 are driven to expand and contract, the two arms 23 and 24 mutually rotate around the connecting shaft 31, and the auxiliary arms 25 to 28 rotate around the connecting shaft 30°31.
．． Rotate while keeping the position 35 in a straight line.

At the same time, the rollers 33 and 34 roll in the grooves 15 and 19 of the guide frame 14 and the guide frame 18, respectively, while coming into contact with the upper surface of the base 1 or the lower surface of the table 2, whereby the table 2 It is stably supported by the rage tong mechanism 3 and moves up and down while maintaining a state parallel to the base 1.

According to the above-described embodiment, the table 2 is always supported at its central portion by the connecting shaft 30, and the table 2 is
Since both sides of the table 2 are supported by rollers 34 and 34, the load applied to the table 2 and the weight of the table 2 itself are stably supported even when the table 2 is in the raised position or the lowered position, and the deflection of the table 2 is prevented. Prevented as much as possible. Therefore, the strength of the table 2 may be made unnecessarily thick (or sinuous), and the weight of the table 2 can be reduced.
As a result, the arms 23, 24 and the auxiliary arms 25 to 2
8, etc., and a small hydraulic cylinder 4.5 can be used, and the entire lifting device A can be configured to be lightweight and compact.

Moreover, since the rollers 34, 34 move within the guide frame 18 and have a small movement range, there is little change in the support point as the table 2 moves up and down (there is less shaking as the table 2 moves up and down, making it stable).

In the above-mentioned embodiment, two hydraulic cylinders 4 and 5 were used, but depending on the shape of the lifting device A and the size of the load, one hydraulic cylinder 4 and 5 each may be used. 5 may be used, another auxiliary arm may be provided between the arm 23, 24 and the auxiliary arms 25 to 28, or a plurality of tong members 22 may be used with the tip of the arm. The hydraulic cylinders 4 and 5 may be connected vertically to each other so as to be rotatable, and the hydraulic cylinders 4 and 5 may be of a telescopic type. A pneumatic cylinder may be used instead.

〔Effect of the invention〕

According to the present invention, the central portion of the table is always supported by the connecting shaft, and both sides of the table are supported by rollers, so that even if the table is in the raised or lowered position, the load applied to the table and the The weight of the table itself is stably supported, and the table is prevented from bending as much as possible. Therefore, the strength of the lifting device does not need to be increased unnecessarily, a small hydraulic cylinder can be used, and the entire lifting device can be constructed to be lightweight and compact.

In addition, since the roller has a small movement range, there is little change in the support point as the table moves up and down (there is less shaking as the table moves up and down, so it is stable).

[Brief explanation of the drawing]

Fig. 1 and Fig. 2 show an embodiment of the present invention, Fig. 1 is a front view of the elevating device, Fig. 2 is a right side view of the elevating device, and Fig. 3 schematically shows a conventional elevating device. It is a front view. A... Lifting device, 1... Base, 2... Table,
3... Rage tong mechanism, 4.5... Hydraulic cylinder (fluid pressure cylinder), 22... Tong member, 23.
24... Arm, 25.26.27.28... Auxiliary arm, 29.32... Connection shaft, 30° 31.35.
...Connection shaft, 33.34...Roller, 39.40...
·bracket. Applicant TAIYO NKD Co., Ltd. Agent Patent Attorney Yukio Kubo Figure 2

Claims (1)

[Claims] A lifting device comprising a base, a table, a rage tong mechanism that is located between the base and the table and supports the table so as to be movable up and down, and a fluid pressure cylinder that drives the rage tong mechanism to expand and contract, wherein the rage tong mechanism comprises: , a tong member in which two arms are rotatably connected to each other in an X-shape by a connecting shaft at the center thereof, and two upper sides and two lower sides of the arms of the tong member are located at the respective centers of the tong member; The upper auxiliary arm and the lower auxiliary arm have their respective tips rotatably connected to the center of the table by a connecting shaft. It is rotatably connected to a lower surface or a central upper surface of the base, and rollers provided at the upper and lower ends of the arm of the tong member roll on the lower surface of the table or the upper surface of the base. A lifting device characterized by comprising: