JP4832863B2 - Lift device - Google Patents

Description

  The present invention relates to a lift device, and more particularly, to a base, a table disposed above the base, and the base and the table. A hook-shaped link type guide device for maintaining the table in parallel, a main operating arm that pivots on one end to the base and a roller on the other end in contact with the table and moves the main operating arm to raise and lower the table. The present invention relates to a lift device comprising an elevating device provided with an operating device for moving and standing.

  Conventionally, this type of lift device is already known from Patent Document 1, and as shown in FIG. 6, a base 1, a table 2 disposed above the base 1, and the base 1 and the table 2, and when the table 2 is moved in the vertical direction, the hook-shaped link type guide device 3 for maintaining the table 2 parallel to the base 1 and the table 2 are moved up and down. In addition, a lifting / lowering device 4 having a main operating arm 5 pivotally attached to the base 1 at one end and a roller 6 at the other end contacting the table and an operating device 7 for rotating and raising the main operating arm 5. Therefore, a large load can be raised and lowered quickly in a narrow use space. In the example shown in the figure, at the highest stop position of the table 2, the actuating device 7 brings the main operating arm 5 into a substantially vertical state, and at this stop position, the load on the table 2 is in a substantially vertical state. The main operating arm 5 is supported and the operating device 7 is not affected by the load, so that the table 2 can be maintained at the maximum stop position for a long time. The main operating arm 5 includes a main arm 5a, an auxiliary arm 5b, and a horizontal bar 5c connecting the both.

  In the lift device, an intermediate stop position for stopping the table between the lowest position and the highest stop position is set. In order to maintain the intermediate stop position for a long time. It is considered that the load is not exerted on the actuator. For example, a lift device in which a cam plate is provided between a base and a table and the table is moved up and down by the movement of the cam plate is already known (see Patent Document 2). In such a lift device, an intermediate stop position is used. Since the load on the table is supported by the cam plate, the influence of the load on the table does not reach the actuator in the stopped state. However, in order to increase the lift in such a lift device, it is necessary to increase the capacity of the operating device and the cam plate, and it is difficult to install in a place where space is limited.

  That is, as shown in FIG. 7, a roller device 9 is provided on the link arm 3a of the hook-shaped link type guide device 3, and a cam plate 8 is disposed between the roller device 9 and the base 1, and this cam In the case where the plate 8 is moved in the horizontal direction by the operating device 9 and the table 2 is moved up and down by rotating and raising the link arm 3a (see Patent Document 2), the arrangement of the operating device 7 and the cam plate 8 is required. In addition, a large space is required in the horizontal direction, and a large capacity of the actuator is required to move the cam plate.

Japanese Utility Model Publication No. 2-2400 Japanese Patent Laid-Open No. 3-51297

  Therefore, the problem to be solved by the present invention is that the base, the table disposed above the base, and the base and the table are provided between the base and the table in the vertical movement. A saddle-shaped link type guide device for maintaining the table parallel to the table, a main operating arm having one end pivotally attached to the base and the other end contacting the table to raise and lower the table, and the main operating arm In a lift device comprising an elevating device provided with an actuating device for rotating and standing up, even if the table is stopped at an intermediate stop position between the lowest position and the highest stop position, the table is maintained at that position. To provide a lift device having a constant lift in which the load of the table does not affect the operating device.

  In order to solve the above-mentioned problems, the present invention provides a base, a table disposed above the base, and the base and the table. A saddle-shaped link type guide device for maintaining the table parallel to the table, a main operating arm having one end pivotally attached to the base and the other end contacting the table to raise and lower the table, and the main operating arm And a lifting device having an operating device for rotating and standing up, a secondary operating arm having one end pivotally attached to a predetermined position of the main operating arm and contacting the base with a roller at the other end. The main operating arm is rotated and erected via the auxiliary operating arm, and the control means for raising and stopping the auxiliary operating arm in a substantially vertical state at the intermediate stop position of the table is operated. But on the location.

  The main operating arm is preferably provided with a rotation stop portion with which the sub-operating arm abuts, and the control means of the operating device is configured such that when the operating device is a fluid pressure cylinder, the fluid pressure cylinder In the case of a fluid pressure circuit for controlling the operation and the operating device is a screw mechanism that is operated by an electric motor, a controller that controls the electric motor is preferable. Furthermore, it is preferable that the main operating arm stands up and stops in a substantially vertical state at the highest stop position.

  The lift device according to the present invention includes a sub-actuating arm having one end pivotally attached to a predetermined position of the main actuating arm and the other end contacting the base with a roller, the main actuating arm being operated via the sub-actuating arm, and an intermediate Means for stopping the secondary operating arm in a substantially vertical state at the stop position, so that when the table is stopped at the intermediate stop position, the table load is supported by the secondary operating arm in a substantially vertical state. Since the load of the table is less likely to be exerted on the actuator, the table can be maintained at a predetermined intermediate stop position for a long time.

  Embodiments of the present invention will be described below with reference to a lift device shown in the drawings. In the drawings, the same or corresponding parts are denoted by the same reference numerals.

  FIG. 1 shows a lift device when the present invention is applied to the conventional constant lift device shown in FIG. That is, the lift device includes a base 1 made of a frame combined in a substantially rectangular shape, and a table 2 made of a rectangular flat plate arranged in parallel to the base 1 above the base 1. A hook-shaped link type guide device 3 provided between the base 1 and the table 2 for maintaining the table 2 parallel to the base 1 when the table 2 is moved in the vertical direction; In order to operate the two main operating arms 5 and 5 ', which are pivotally attached to the base 1 and have the rollers 6 and 6' at the other end in contact with the table 2, respectively. And an elevating device 4, 4 'having an operating device 7, 7'.

  Since the lifting devices 4 and 4 'have exactly the same structure, only one lifting device 4 will be described below. As shown in FIG. 2, the main operating arm 5 of the lifting / lowering device 4 is provided with a sub-operating arm 10 that is pivotally attached 11 at its predetermined position and is in contact with the base 1 with a roller 12 at the other end. A tip of a piston 7a of a hydraulic cylinder, which is the operating device 7, is pivotally attached to an intermediate position of the sub operating arm. Therefore, by operating the auxiliary operating arm 10 by the hydraulic cylinder 7, the main operating arm 5 can be rotated and erected. As shown in FIG. 3, when the supply of hydraulic pressure to the hydraulic cylinder 7 is interrupted when the sub-actuating arm 10 is rotated and raised in a substantially vertical state, the rotation of the main operating arm 5 is stopped, and the table 2 intermediate stop positions. When the operating device is the hydraulic cylinder 7, such a control means is provided in a hydraulic circuit that supplies hydraulic pressure to the hydraulic cylinder 7.

  The predetermined position of the main operating arm 5 pivotally attached to the sub operating arm 10 erects the sub operating arm 10 in a substantially vertical state at the intermediate stop position, so that the intermediate stop of the table 2 is performed as shown in FIG. It is determined by the height H of the position and the length h of the auxiliary operating arm 10. That is, as shown in FIG. 4, the height H of the intermediate stop position is H = sin θ · L, and the predetermined position at that time can be determined by l = L · h / H. In this case, H is the vertical distance between the center of the roller 6 and the plane including the pivot point 1a, and substantially coincides with the height of the intermediate stop position, and L is the distance between the center of the roller 6 and the pivot point 1a. , Approximately the length of the main operating arm 5. θ is an inclination angle of the main operating arm 5 stopped at the intermediate stop position, and h is a distance between the contact points of the pivot point 11 and the base of the roller 12 and substantially represents the length of the sub-operating arm. The predetermined position X of the main operating arm 5 is represented by a length along the main operating arm from the pivot point 1a. For example, in the case of H = 1 / 2L, the position separated by 1 (l = 2h) from the pivot point 1a is the predetermined position X.

  The sub-actuating arm 10 is provided with an engaging portion 13 that engages with the rotation stopping portion 14 of the main operating arm 5. The engaging portion 13 is arranged so that the sub-operating arm 10 is in an intermediate stop position of the table 2. When stopping at, the engagement with the rotation stop portion 14 of the main operating arm 5 is performed, and as shown in FIG. 3, the auxiliary operating arm 10 helps to stand up in a substantially vertical state. That is, when the engaging portion 13 is engaged with the rotation stopping portion 14, the sub operating arm 10 is prevented from rotating with respect to the main operating arm 5, and the force of the piston 7 a of the hydraulic cylinder 7 is This is transmitted not only through the pivot point 11 but also through this engaging portion. Accordingly, the rotation stop unit 14 provided in the main operation arm 5 transmits the force for the subsequent rotation of the main operation arm 5 via the rotation stop unit 14, so that the rotation stop unit 14 rotates. It is preferable to use a roller, and the engagement portion 13 is preferably formed with a wear-resistant portion 13a.

  As the fluid pressure applied to the cylinder, water pressure or air pressure can be used instead of the oil pressure. Further, the operating device of the main operating arm 7 can be a screw mechanism that is operated by an electric motor, and in this case, an electric motor controller is used as a control means.

  Now, when the hydraulic cylinders 7 and 7 ', which are the operating devices of the elevating devices 4 and 4', are driven in synchronism and stopped at the intermediate stop position shown in FIG. 3, the secondary operating arm stands up in a substantially vertical state. Therefore, the load applied to the table in this state is supported by the sub-operation arm 10 and does not affect the hydraulic cylinders 7 and 7 ′, there is no possibility of causing hydraulic leakage, and there is hydraulic leakage. Even so, the table 2 can be prevented from descending. Therefore, it can be stopped for a long time at an accurate intermediate stop position as compared with the conventional lift device. Further, when the load on the table is heavy, the driving force of the actuator can be reduced.

  The lift device of the present invention can handle a large load with a high head, and can be stopped at an accurate height and maintained at a stop position for a long time. Can be used instead.

FIG. 1 is a side view of a lift device according to an embodiment of the present invention. FIG. 2 is a side view of the lifting device when the table of the lift device of FIG. 1 is in the lower stop position. FIG. 3 is a side view of the lifting device when the table of the lift device of FIG. 1 is in the intermediate stop position. FIG. 4 is an explanatory view showing a method of determining a predetermined position for pivotally attaching the sub-actuating arm. FIG. 5 is a side view of the lifting device when the table of the lift device of FIG. 1 is at the highest stop position. It is a side view of the conventional constant lift device. It is a side view of the conventional constant lift device.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Base 2 Table 3 Cascade link type guide device 4, 4 'Elevating device 5, 5' Main action arm 6, 6 'Roller 7, 7' Actuator 8 Cam plate 9 Roller device 10 Secondary action arm 11 Pivoting point 12 Roller 13 Engagement part 14 Rotation stop part

Claims (5)

  A base, a table disposed above the base, and a bowl-like shape provided between the base and the table for maintaining the table parallel to the base when the table is moved in the vertical direction A link type guide device, a main operating arm that pivots on one end to a base and contacts a roller on the other end to the table, and an operating device for rotating and raising the main operating arm in order to raise and lower the table. A lifting device comprising a lifting device provided with a secondary operating arm pivotally attached to a predetermined position of the main operating arm and in contact with a base by a roller at the other end, and the main operating arm is connected to the secondary operating arm. The operating device is provided with control means for rotating and standing up via the arm and for standing up and stopping the sub operating arm in a substantially vertical state at an intermediate stop position of the table. Shift apparatus.   The lift device according to claim 1, wherein the main operating arm is provided with a rotation stop portion with which the sub operating arm abuts.   2. The lift device according to claim 1, wherein the control means provided in the operating device comprises a hydraulic circuit for controlling the operation of the cylinder when the operating device is a fluid pressure cylinder.   2. The lift device according to claim 1, wherein the control means provided in the operating device comprises a controller for controlling the electric motor when the operating device is a screw mechanism operated by an electric motor.   5. The lift device according to claim 1, wherein the main operating arm stands up and stops in a substantially vertical state at the highest stop position of the table.

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