JPH075115Y2 - Scissors mechanism for lift - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to an improvement in a scissor mechanism that supports an elevator or a movable floor and expands and contracts vertically.

(Prior Art) A scissor mechanism that supports an elevator or a movable floor and expands and contracts in the vertical direction is conventionally configured as shown in FIG. 3, for example.

That is, an arm unit 20 in which the outer arm 1A, the inner arm 2B, and the lower arm 1C are sequentially connected from the bottom by the end pins 4,
The inner arm 2A, the outer arm 1B, and the inner arm 2C are symmetrically combined with the arm unit 21 in which the inner arm 2C is sequentially connected from the bottom by the end pins 4, and the outer arms 1A to 1C and the inner arm intersecting with the outer arm 1A to 1C.
2A to 2C are connected to each other by a center pin 12 at the intersection so as to be rotatable relative to each other.

The end of the lower outer arm 1A of the arm unit 20 is hinged to the bracket 6 provided on the floor surface 5, and the end of the upper outer arm 1C is freely rotatably moved to the platform 8 as shown in FIG. A roller 11 is attached to support the.

On the other hand, a roller 10 rolling on the floor 5 is rotatably attached to an end of the lower inner arm 2A of the arm unit 21, and an end of the upper inner arm 2C is attached to the platform 8 via a bracket 9. Hinge it.

The arm units 20 and 21 are integrally expanded and contracted while rolling the rollers 10 and 11 by a driving device such as a hydraulic cylinder (not shown), while keeping the refraction angles of the end pins 4 equal, and move the platform 8 up and down together with the load.

(Problem of the invention) By the way, in this scissor mechanism, the end pins 4 of the one arm unit 20 and the end pins 4 of the other arm unit 21 overlap on the same vertical plane, so that the arms 1A to 1C and 2A to 2C are horizontal. Cannot be contracted until. Therefore, even in the most contracted state, the platform 8
Was still located at a considerable height, and had a problem that the effective head was small.

The present invention has been made in view of the above problems of the scissors mechanism, and an object thereof is to provide a scissors mechanism having a structure capable of reducing the overall height at the time of contraction.

(Means for Achieving the Object) In the present invention, an outer arm unit in which a plurality of outer arms are flexibly connected in an up-and-down direction via end pins and an inner arm unit configured in the same manner are made symmetrical. The outer arm and the inner arm are arranged so as to overlap with each other, and each of the arm units of the respective arm units is sequentially changed while the outer arm and the inner arm are coupled to each other by center pins so as to be rotatable relative to each other.

(Function) The outer arm unit composed of only the outer arm and the inner arm unit composed of only the inner arm bend and extend without interfering with each other, so it is possible to contract until each arm is folded horizontally and contracts. The total height of the time scissors is lowered. Also, by sequentially changing the dimensions of the arm,
It becomes possible to design according to the load bearing, and the total height at the time of contraction can be further reduced. (Example) FIGS. 1 and 2 show an example of the present invention.

Shown in these figures is a platform that supports a platform 8 with a scissors mechanism consisting of an outer arm unit 1 and an inner arm unit 2. The outer arm unit 1 consists of three outer arms 1A to 1C that are sequentially connected. The inner arm unit 2 is composed of three inner arms 2A to 2C which are similarly connected in sequence.

The outer arms 1A to 1C are from the lower outer arm 1A to the upper outer arm.
It is formed so that the length becomes shorter and the width becomes narrower as it reaches 1C. The inner arms 2A to 2C are also formed to have the same dimensions as the outer arms 1A to 1C.

Each connecting portion between the outer arms 1A and 1B and the outer arms 1B and 1C is
Brackets 3 formed on the ends of the outer arms 1A to 1C, respectively
And an end pin 4 that connects the brackets 3 to each other so that they can rotate relative to each other. End pin 4 is each outer arm
It is located on the extension line of the upper side or the lower side of 1A to 1C, whereby the outer arms 1A to 1C can bend to a position where they are folded in parallel with the end pin 4 as a fulcrum.

Similarly to the outer arms 1A to 1C, the inner arms 2A and 2B and the inner arms 2B and 2C are also connected by the bracket 3 and the end pins 4.

The lower end of the lower outer arm 1A is hinged to a bracket 6 protruding from the floor surface 5, and the upper end of the upper outer arm 1C is hinged to a bracket 9 protruding from the lower surface of the platform 8.

On the other hand, a roller 10 rolling on the floor 5 is rotatably attached to the lower end of the lower inner arm 2A, and the upper inner arm 2C is rotated.
A roller 11 for supporting the lower surface of the platform 9 while rolling is attached to the upper end of the rotatably.

As shown in FIG. 1, the outer arm unit 1 and the inner arm unit 2 configured to bend and extend in the vertical direction as described above are in a state in which the arms 1A and 2A, the arms 1B and 2B, and the arms 1C and 2C are adjacent to each other. The arms 1A to 1C and 2A to 2C which are superposed in a symmetrical shape and intersect each other are intersected by a center pin 12 so as to be freely rotatable relative to each other.

The center pin 12 is connected to the lower arms 1A and 2A.
And the middle arms 1B and 2B form an equilateral quadrangle, and the middle arms 1B and 2B and the upper arms 1C and 2C form a smaller equilateral quadrangle, and the outer arm unit and the inner arm unit. Combine two.

Between the middle part of the lower outer arm 1A and the floor surface 5 is the outer arm 1A.
A hydraulic cylinder 7 for rotating the is installed. Also,
A stopper 13 that comes into contact with the roller 10 and regulates the sliding is detachably installed on the floor surface 5.

Next, the operation will be described.

When the stopper 13 is removed from the state shown in FIG. 1 and the hydraulic cylinder 7 is slowly contracted, the outer arm 1A pivots clockwise about the bracket 6 as a fulcrum, and the center pin 12
In, the inner arm 2A connected to the outer arm 1A rotates counterclockwise in the figure, and the roller 10 rolls on the floor surface 5 in the direction away from the bracket 6. As a result, the middle outer arm 1B and inner arm 2B, which are connected to the upper ends of the outer arm 1A and inner arm 2A via the end pins 4, rotate counterclockwise and clockwise around the center pin 12 connecting them. Rotate respectively. Further, the outer arm 1C and the inner arm 2C in the upper stage are also rotationally displaced about the center pin 12 in the clockwise and counterclockwise directions in the figure, and the roller 11 attached to the inner arm 1C moves the lower surface of the platform 8 away from the bracket 9. Roll to.

In this way, the outer arm sonic unit 1 and the inner arm unit 2 contract while maintaining the symmetrical shape, and the platform 8 descends in a horizontal state. Since the outer arm unit 1 composed only of the outer arms 1A to 1C and the inner arm unit 2 composed only of the inner arms 2A to 2C do not interfere with each other during contraction, the scissors finally reach the position shown in FIG. As shown in
The outer arms 1A to 1C and the inner arms 2A to 2C are horizontally folded. Therefore, plant form 8
Can be lowered to a very low position.

On the other hand, when the hydraulic cylinder 7 is driven to extend from the contracted position, the outer arm 1A rotates counterclockwise in the figure, and accordingly, the outer arm unit 1 and the inner arm unit 2 extend integrally. Further, the rollers 10 and 11 roll along the floor surface 5 and the platform 8 in the direction of approaching the brackets 6 and 9, respectively. As a result, the platform 8 rises while maintaining the level. When the platform 8 rises to a predetermined height, the stopper 13 is set on the floor surface 5 to regulate the rolling of the rollers 10, thereby the outer arm unit 1
The inner arm unit 2 is restricted from contracting, and the platform 8 is supported upward at that position. Also, the hydraulic cylinder 7 is released from the contraction pressure. In addition, since the contraction position is extremely low, the length of the scissors can be increased,
A sufficient head can be secured without increasing the number of stages.

By the way, in this scissors mechanism, the widths of the arms 1A to 1C and the arms 2A to 2C become narrower as going from the lower stage to the upper stage. The height of the platform 8 can be further reduced, and the material can be saved. Further, the lengths of the arms 1A to 1C and 2A to 2C are also shortened toward the upper stage, whereby the scissors are spread downward, so that the stability of the platform 8 at the time of rising is also sufficient.

On the other hand, if the lengths of the arms 1A to 1C and 2A to 2C are shortened conversely toward the lower stage where the load is heavy, the moment load acting on the lower arms 1A and 2A is reduced, and thus the arms 1A and 2A are reduced. Since it is possible to further narrow the width, it is possible to further reduce the overall height at the time of contraction.

(Effects of the Invention) As described above, the scissors mechanism of the present invention is arranged such that the outer arm unit and the inner arm unit, in which the plurality of arms are flexibly connected in the vertical direction via the end pins, are symmetrically overlapped and arranged. Since the arm and the inner arm are connected to each other at the intersections so as to be freely rotatable relative to each other, the outer arm unit and the inner arm unit can be contracted until the arms are folded horizontally without interfering with each other.
Therefore, the total height of the scissors at the time of contraction can be made extremely low, and a large lift can be obtained with a small scissors.

Furthermore, by sequentially changing the dimensions of the arms of each arm unit according to the load load, etc., the overall height of the scissors at the time of contraction can be further suppressed, and the material of the arms can be saved.

[Brief description of drawings]

FIG. 1 is a front view of a lifting platform using a scissor mechanism according to an embodiment of the present invention when the scissors are extended, and FIG. 2 is a front view when the scissors are similarly contracted. Further, FIG. 3 is a front view of a main part of a scissors mechanism showing a conventional example, and FIG. 4 is a front view of an elevator board using the scissors mechanism. 1 ... Outer arm unit, 1A-1C ... Outer arm, 2 ...
Inner arm unit, 2A to 2C ... Inner arm, 4 ... End pin, 5 ... Floor, 7 ... Hydraulic cylinder, 8 ... Platform, 10, 11 ... Roller, 12 ... Center pin.

Claims (1)

[Scope of utility model registration request] 1. An outer arm unit in which a plurality of outer arms are flexibly connected in an up-and-down direction via end pins and an inner arm unit configured similarly to the outer arm unit are arranged in a symmetrical manner to form an outer arm. The inner arm and the center pin are connected to each other at each intersection so that they can rotate relative to each other.
A scissor mechanism for lifts, characterized by sequentially changing the dimensions of the arms of each arm unit.