JP5336103B2 - Lift device - Google Patents

Description

  The present invention relates to a lift device that is used in a vehicle maintenance lift or the like and moves up and down a lift using an X link mechanism.

In a lift device such as a vehicle maintenance lift, a pair of parallel inner links and a pair of parallel outer links arranged outside the inner links are pivotally attached to each other so as to be rotatable relative to each other. It has a link mechanism, and the X link mechanism is vertically expanded and contracted by an actuator such as a hydraulic cylinder, so that the elevator platform can be raised and lowered. In addition, a two-stage punter lift in which two X-link mechanisms are vertically stacked is also well known.
In such a lift device, various boosting mechanisms are applied in order to efficiently raise with the power of a compact actuator. For example, in Patent Document 1, one end of a link link is rotatably connected to a position above the center axis attachment part of one link, and the middle part of the lever link is rotated to a position above the center axis attachment part of the other link. The other end of the connecting link and one end of the lever link are connected together with the tip of the ball screw mechanism. As the ball screw extends, one link is pulled up via the connecting link, and the other end of the lever link is connected to the other end of the lever link. A booster mechanism is described in which the other link is erected by sliding along the end of one link.
On the other hand, in Patent Document 2, a guide roller provided at the other end with one end of an intermediate arm pivotally attached to one link is accommodated in a guide groove provided at the other link, and a connecting rod between the guide rollers is electrically operated. A booster mechanism is disclosed in which a cylinder is connected, and an electric cylinder is contracted to raise an intermediate arm so that a guide roller rolls in a guide groove to extend an X link mechanism.

JP 2000-351590 A JP-A-8-217392

However, in the booster mechanism of Patent Document 1, there is a difference in the lifting speed between the state where the other end of the lever link slides on the end of the link and the state where the other end of the lever is separated from the end of the link. There is also a risk that the descent speed will increase and an impact sound will be emitted. This is also the case with the booster mechanism disclosed in Patent Document 2, in which the lifting speed differs between the state in which the guide roller slides in the guide groove and the state in which the guide roller reaches the end of the guide groove. I can't get any action.
In addition, such a lifting operation reduces power efficiency, increases the amount of electricity used in the hydraulic pump and the electric cylinder, and leads to an increase in the size of the motor. Further, even if such a booster mechanism is provided, when a hydraulic cylinder is used, a hydraulic cylinder having a large diameter is required to obtain a necessary lift, which does not lead to cost reduction.

  Therefore, the present invention provides a smooth and stable lifting operation with a constant lifting speed of the lifting platform, can prevent the generation of impact noise at the lower limit position, and has good power efficiency and miniaturization of the motor. Another object of the present invention is to provide a lift device that can achieve a reduction in the diameter of a cylinder and a reduction in cost.

In order to achieve the above object, the invention described in claim 1 is a lift device including a two-stage pantari lift, at a position above the axial attachment position with the outer link in the lower inner link, at the upper end. The lower end of the lever link with the tera roller is rotatably connected, the lower end of the actuator is rotatably connected to the lower end of the lower inner link, and the upper end of the actuator is connected to the upper end of the lever link so as to be rotatable coaxially with the lever. Thus, the lever link is rotated in accordance with the expansion / contraction operation of the actuator, while the lever roller comes into contact with the lower part of the upper inner link with respect to the outer link, so that the rotation of the lever link and the two-stage pantari lift A cam rail with a cam surface on which the teco roller rolls at the same time as the telescopic movement of the actuator is provided, and the actuator extends from the lower limit position of the lifting platform In Rukoto, it is characterized in that it has a two-stage pantograph lifts pushing up the inner link of the upper via Tekorora and cam rail so as to extend operation to the upper limit position.
In order to achieve the above object, a second aspect of the present invention is a lift device including a one-stage X-link mechanism, and a ticker roller is provided at the upper end of the inner link at a lower position than the position where the inner link is attached to the outer link. The lower end of the provided lever link is rotatably connected, the lower end of the actuator is rotatably connected to the lower end of the inner link, and the upper end of the actuator is rotatably connected to the upper end of the lever link coaxially with the lever roller. While the lever link is rotated in accordance with the expansion / contraction operation, the lever roller comes in contact with the upper link of the outer link with the inner link, and the roller roller rotates simultaneously with the rotation of the lever link and the expansion / contraction operation of the X link mechanism. By providing a cam rail with a moving cam surface, the actuator extends from the lower limit position of the lifting platform, It is characterized in that it has an X-link mechanism pushes up the outer link so as to extend operation to the upper limit position via the cam rail.

According to the present invention, the ascending / descending speed of the elevator platform is constant, and a smooth and stable ascending / descending operation can be obtained, and the occurrence of impact sound at the lower limit position can also be prevented. In addition, due to the stable lifting operation, the power efficiency is good and the motor can be downsized.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[Form 1]
FIG. 1 is a perspective view showing an example of a vehicle maintenance lift to which the lift device of the present invention is applied. FIG. 2 shows the front, right side, and back of the vehicle, respectively. A pair of lifts 2 and 2 are arranged in parallel on the left and right. The two-stage pantari lift 2 includes a pair of parallel inner links 4 and 4 and a pair of parallel links arranged outside the inner links 4 and 4. The X link mechanisms 3 and 3 that are rotatably attached to each other by the center shaft 6 at the intermediate portions between the outer links 5 and 5 are stacked in two stages vertically, and the ends of the outer links 5 and the ends of the inner links 4 are stacked. The two are pivotally attached to each other by a hinge pin 7. Further, in each of the two-stage panter lifts 2, a vehicle cradle 8 as a lifting platform is provided at the upper end of the upper X link mechanism 3. In the following, in order to distinguish between the upper and lower inner links 4 and the outer links 5, “lower inner link 4” “upper inner link 4” “lower outer link 5” “upper outer link 5” are attached with upper and lower. explain.

In the two-stage panter lifts 2 and 2, the lower end of each lower inner link 4 is the front end of the base frame 9 to which the vehicle cradle 8 can be fitted (the lower left direction in FIG. 1 is the front), and the tuning shaft 10. Are rotatably coupled in synchronization with each other. Further, as shown in FIG. 5, the lower end of each lower outer link 5 slides back and forth by the sliding block 11 provided at the lower end being fitted and guided by the guide rail 12 provided on the base frame 9. It is possible.
On the other hand, the upper end of the upper inner link 4 is rotatably attached to the front end of the vehicle cradle 8, while the upper end of the upper outer link 5 is also provided with a sliding block 13 provided at the upper end as shown in FIG. By being fitted and guided by a guide rail 14 provided on the cradle 8, it can slide back and forth.

15 and 15 are each a booster mechanism provided on each of the two-stage panterlifts 2 to raise and lower the lifts. However, since it has a symmetrical structure, one of the booster mechanisms 15 will be described.
At the upper end of the lower inner link 4 near the hinge pin 7, as shown in FIGS. 3 and 4, the lower ends of the pair of lever links 16, 16 are pivotally mounted by a lever link shaft 17 so as to be rotatable in the plane in the front-rear direction. A pair of lever rollers 18, 18 are provided between the upper ends of the lever links 16, 16 so as to be rotatable by a lever roller shaft 19 at a predetermined interval in the left-right direction.
A hydraulic cylinder 20 is disposed between the left and right lower inner links 4, 4, and a lower end is connected to the tuning shaft 10, while a tip of the piston rod 21 is between the telecommunication rollers 18, 18. The teco roller shaft 19 is rotatably connected. The hydraulic cylinders 20 and 20 are connected in series in a hydraulic circuit (not shown) provided with an oil tank, a pump, an electromagnetic switching valve, and the like, and extend and contract in synchronization.

On the other hand, a connecting plate 22 is installed between the lower ends of the left and right upper inner links 4, 4, and a pair of cam rails 23, 23 are arranged on the lower surface side of the connecting plate 22 in the left-right direction according to the lever rollers 18, 18. Are fixed at a predetermined interval. The cam rail 23 has a corrugated cam surface 24 with a concave curved surface on the center shaft 6 side and a convex curved surface on the hinge pin 7 side on the lower side. As shown in FIGS. 4 (A) and 4 (B), the lever roller 18 can roll on the cam surface 24 in accordance with the expansion / contraction operation of the punter lift 2.
A stopper plate 25 is installed between the lower inner links 4 and 4 on the side of the center shaft 6 from the lever link shaft 17. The side plate portion 26 on the lower end side of the lever link 16 tilts the lever link 16 at the lower limit of the vehicle cradle 8. It is inclined to support.

  In the vehicle maintenance lift 1 configured as described above, at the lower limit position of the vehicle cradle 8 shown in FIG. 5A, the position of the hinge pin 7 that is closer to the other side than the axis of the link is set. The link 4 and the outer link 5 are in a substantially horizontal posture and contract the two-stage pantarilift 2. At this time, the piston rod 21 of the hydraulic cylinder 20 contracts, the lever roller shaft 19 is positioned on the concave curved surface side of the cam rail 23, and the lever roller 18 is brought into contact with the deepest portion of the cam surface 24. At this position, the lever link 16 is supported in an inclined posture on the side plate portion 26 of the stopper plate 25, and the hydraulic cylinder 20 is also in an inclined posture.

  When the piston rod 21 of the hydraulic cylinder 20 is extended in this state, the lever link 16 whose tip is connected to the piston rod 21 rotates counterclockwise in the same figure, and the upper inner link 4 is tilted from the lower side via the lever roller 18 and the cam rail 23. In order to press, the said pressing force acts on the direction which opens the upper and lower inner links 4 and 4. FIG. Since the two-stage punter lift 2 is structurally expanded and contracted in synchronism with the expansion and contraction of some links, the two-stage punter lift 2 gradually moves as shown in FIGS. The vehicle cradle 8 is raised in a horizontal position. At this time, the hydraulic cylinder 20 rises gradually while rotating rightward in FIG. 5 with the lower end as the center, and gives an extension force to the two-stage punter lift 2 via the lever roller 18 and the cam rail 23.

  As the rotation of the lever link 16 and the extension operation of the two-stage panterlift 2 proceed, the lever roller 18 gradually lowers from the deepest part of the cam surface 24 (convex surface) as shown in FIGS. To the side) and the state where the lever 18 is always pressed against the cam surface 24 is maintained. When the extension of the piston rod 21 reaches the maximum stroke, the lever 18 is positioned at the top of the cam surface 24 of the cam rail 23 as shown in FIG. The base 8 is supported horizontally at the upper limit position. As described above, the lever roller 18 rolls along the corrugated cam surface 24, so that the two-stage punter lift 2 extends at a substantially constant speed from the lower limit position to the upper limit position.

  When descending, the operation is reverse to that when ascending, and as the piston rod 21 contracts, the lever 18 rotates the lever 16 while moving the cam surface 24 upward while rotating the hydraulic cylinder 20 counterclockwise. The undulation operation is gradually performed, and the two-stage punter lift 2 is contracted to the lower limit position of the vehicle cradle 8 in FIG. In this case as well, the upper inner link 4 is contracted while being supported by the hydraulic cylinder 20 that gradually contracts via the cam rail 23 and the teco roller 18, so that the upper inner link 4 operates at a substantially constant speed from the upper limit position to the lower limit position. Therefore, no impact sound is generated when the lower limit position is reached.

  As described above, according to the vehicle maintenance lift 1 of the first aspect, the lower end of the lever link 16 having the upper end of the lever roller 18 is rotatably connected to the upper portion of the lower inner link 4 than the center shaft 6. The lower end of the lower inner link 4 is rotatably connected to the lower end of the hydraulic cylinder 20, and the upper end of the hydraulic cylinder 20 is connected to the upper end of the lever link 16 so as to be rotatable coaxially with the lever roller 18. At the same time, the lever link 16 is rotated, while the lever roller 18 comes into contact with the lower portion of the upper inner link 4 than the center shaft 6, and simultaneously with the rotation of the lever link 16 and the expansion and contraction operation of the two-stage punter lift 2. By providing a cam rail 23 having a cam surface 24 on which the hydraulic cylinder rolls, the hydraulic cylinder 20 extends from the lower limit position of the vehicle cradle 8 to The upper inner link 4 is pushed up via the roller 18 and the cam rail 23 to extend the two-stage pantarilift 2 to the upper limit position, so that the lifting speed of the vehicle cradle 8 becomes constant and smooth and stable. Ascending / descending operation can be obtained, and the generation of impact sound at the lower limit position can be prevented. In addition, because of the stable lifting operation, the power efficiency is good and the motor can be downsized, and the diameter of the hydraulic cylinder 20 can be reduced, and cost reduction can be expected.

  Particularly, since the power efficiency is improved in this way, even if the left and right hydraulic cylinders 20 and 20 are connected in series in the hydraulic circuit, a compact type that can be accommodated between the inner links 4 can be used. Therefore, it becomes strong against the uneven load, and even when an unbalanced load is applied to the left and right vehicle cradles 8, 8, it is difficult to cause a step, and safety and reliability can be ensured.

[Form 2]
Next, another embodiment of the present invention will be described. However, the same components as those in the first embodiment are denoted by the same reference numerals and redundant description is omitted.
FIG. 6 is a side view showing an example of a table lifter to which the lift device of the present invention is applied. The table lifter 30 is formed on a base 35 with a pair of parallel inner links 32, 32 and outer sides of the inner links 32, 32. And a pair of parallel outer links 33, 33 positioned at a center shaft 34 rotatably mounted on a center shaft 34, and a table 36 as a lifting platform can be raised and lowered at the upper end of the X link mechanism 31. I support it.

  The booster mechanism 15 here is provided between the inner link 32 and the outer link 33. That is, the lever link 16 is pivotally attached by the lever link shaft 17 below the center shaft 34 of the inner link 32, and the lower end of the hydraulic cylinder 20 is connected to the lower end of the inner link 32, so that the upper end of the piston rod 21 is Is rotatably connected to the upper end of the lever link 16. On the other hand, the connecting plate 22 and the cam rail 23 are provided above the center shaft 34 of the outer link 33, and the roller 18 rotates on the cam surface 24 as the lever link 16 rotates and the X link mechanism 31 expands and contracts. It is possible to move. The stopper plate 25 is set on the base 35.

Therefore, also in this table lifter 30, at the lower limit position of the table 36 shown in FIG. 6B, the piston rod 21 of the hydraulic cylinder 20 contracts to position the lever roller 18 on the concave curved surface side of the cam rail 23. Is brought into contact with the deepest portion of the cam surface 24. At this position, the lever link 16 is supported in an inclined posture on the side plate portion 26 of the stopper plate 25, and the hydraulic cylinder 20 is also in an inclined posture.
When the piston rod 21 of the hydraulic cylinder 20 is extended from here, the lever link 16 rotates to the right in the figure, and the inner link 33 is pressed obliquely from below via the lever roller 18 and the cam rail 23. It acts in the direction of opening 31 and causes the X link mechanism 31 to extend. At this time, the hydraulic cylinder 20 rises gradually while rotating counterclockwise around the lower end, and gives an extension force to the X link mechanism 31 via the lever roller 18 and the cam rail 23.

  As the rotation of the lever link 16 and the extension operation of the X link mechanism 31 proceed, the lever roller 18 gradually rolls downward from the deepest portion of the cam surface 24 (the convex curved surface side), and always presses the roller roller 18 against the cam surface 24. To maintain the state. When the extension of the piston rod 21 reaches the maximum stroke, as shown in FIG. 4A, the lever roller 18 is positioned at the top of the cam surface 24 of the cam rail 23, and the table 36 is moved to the upper limit by the extended X link mechanism 31. Supported horizontally in position. As the teco roller 18 rolls along the corrugated cam surface 24 as described above, the X link mechanism 31 extends at a substantially constant speed from the lower limit position to the upper limit position.

  When descending, the operation is reverse to that when ascending, and as the piston rod 21 contracts, the lever roller 18 rotates the cam surface 24 upward while rotating the lever link 16 counterclockwise, while rotating the hydraulic cylinder 20 clockwise. The X link mechanism 31 is contracted to the lower limit position of the table 36 in FIG. Also in this case, the inner link 32 is contracted while being supported by the hydraulic cylinder 20 that gradually contracts via the cam rail 23 and the teco roller 18, so that the inner link 32 operates at a substantially constant speed from the upper limit position to the lower limit position. Therefore, no impact sound is generated when the lower limit position is reached.

  As described above, also in the table lifter 30 according to the second aspect, the lower end of the lever link 16 is rotatably connected to the lower portion of the inner link 32 than the center shaft 34, and the lower end of the hydraulic cylinder 20 is connected to the lower end of the inner link 32. The upper end of the hydraulic cylinder 20 is connected to the upper end of the lever link 16 so as to be rotatable coaxially with the lever roller 18 so that the lever link 16 can be rotated as the hydraulic cylinder 20 expands and contracts. A cam rail 23 provided with a cam surface 24 on which the lever 18 abuts at a position above the center shaft 34 in the link 33 and the lever 18 rolls simultaneously with the rotation of the lever link 16 and the expansion and contraction of the X link mechanism 31 is provided. When the hydraulic cylinder 20 extends from the lower limit position of the table 36, the lever roller 18 and the cam rail 2 are moved. The X-link mechanism 31 is extended to the upper limit position by pushing up the outer link 33 via the, so that the elevation speed of the table 36 is constant and a smooth and stable raising / lowering operation is obtained. Generation of impact sound can also be prevented. In addition, because of the stable lifting operation, the power efficiency is good and the motor can be downsized, and the diameter of the hydraulic cylinder 20 can be reduced, and cost reduction can be expected.

In Embodiments 1 and 2, the number of lever rollers and cam rails may be increased, or one roller roller and cam rail having a large width (thickness) may be provided one by one.
In addition, the cam surface shape of the cam rail is not limited to the waveform in the above-described form, but can be changed as appropriate according to the stroke of the actuator, the lift amount of the lift platform, and the like. Furthermore, the actuator is not limited to a hydraulic cylinder, and an air cylinder, an electric cylinder, a ball screw, or the like can be used.
In the above embodiment, a vehicle maintenance lift having a pair of left and right two-stage panter lifts and a table lifter having a single X-link mechanism are described. The present invention can be applied not only to a lift for vehicle maintenance provided with a pair of left and right, but also to a table lifter provided with a two-stage punter lift as in the first mode, as well as to other lift devices such as a level difference canceller.

It is a perspective view of the lift for vehicle maintenance of form 1. It is explanatory drawing of the lift for vehicle maintenance of form 1, (A) shows the front, (B) shows the right side, and (C) shows the back, respectively. It is the side view which looked at the lift for vehicle maintenance of form 1 from diagonally forward. (A) (B) is explanatory drawing of a booster mechanism. (A)-(J) is explanatory drawing which shows the raising / lowering operation | movement of a two-stage type panter lift. In the side view of the table lifter of form 2, (A) shows an upper limit position and (B) shows a lower limit position, respectively.

Explanation of symbols

  1 ・ ・ Vehicle maintenance lift, 2 ・ ・ Two-stage panter lift, 3 ・ ・ X link mechanism, 4 ・ ・ Inner link, 5 ・ ・ Outer link, 6 ・ ・ Center shaft, 7 ・ ・ Hinge pin, 8 ・ ・Vehicle cradle, 9 ·· Base frame, 15 ·· Boosting mechanism, 16 ·· Teco link, 17 ·· Teco link shaft, 18 ·· Teco roller, 19 ·· Teco roller shaft, 20 ·· Hydraulic cylinder, 21 ·· Piston rod .., 23..Cam rail, 24..Cam surface, 25..Stopper plate, 30..Table lifter, 31..X link mechanism, 32..Inner link, 33..Outer link, 35..Base, 36. ·table.

Claims (2)

An X link mechanism in which a pair of parallel inner links and a pair of parallel outer links positioned outside the inner links are pivotally attached to each other in an intermediate manner is stacked in two stages, and the upper and lower inner links are stacked. A two-stage punter lift formed by connecting links and outer links, a lifting platform supported horizontally at the upper end of the two-stage punter lift, and a vertical movement of the two-stage punter lift. And a lift device having an actuator for raising and lowering the lifting platform,
A lower end of a lever link provided with a lever roller at the upper end is rotatably connected to a portion of the lower inner link that is higher than a position where the outer link is attached, and a lower end of the actuator is connected to a lower end of the lower inner link. The upper end of the actuator is rotatably connected to the upper end of the lever link so as to be rotatable coaxially with the lever roller, and the lever link is rotated in accordance with the expansion / contraction operation of the actuator,
A cam surface on which the lever is in contact with a lower portion of the upper inner link than the position where the outer link is attached, and the lever is rotated simultaneously with the rotation of the lever link and the expansion and contraction of the two-stage punter lift. A cam rail equipped with
The actuator is extended from the lower limit position of the lifting platform, so that the upper inner link is pushed up via the lever roller and the cam rail to extend the two-stage pantari lift to the upper limit position. And lift device. An X link mechanism in which a pair of parallel inner links and a pair of parallel outer links positioned outside the inner links are pivotally attached to each other in an intermediate portion, and horizontally supported by the upper ends of the X link mechanisms A lifting device having a lifting platform, and an actuator for moving the X link mechanism up and down in a vertical direction to lift the lifting platform,
A lower end of a lever link provided with a lever roller at the upper end is rotatably connected to a portion of the inner link below a position where the inner link is attached to the outer link, and a lower end of the actuator is rotatably connected to a lower end of the inner link. The upper end of the actuator is connected to the upper end of the lever link so as to be rotatable coaxially with the lever roller, and the lever link is rotated in accordance with the expansion / contraction operation of the actuator,
A cam rail provided with a cam surface on which the lever is in contact with a portion of the outer link that is above the axial attachment position with the inner link, and the lever rolls simultaneously with the rotation of the lever link and the expansion and contraction of the X link mechanism. With
A lifting device characterized in that the X link mechanism is extended to the upper limit position by pushing up the outer link via the lever roller and the cam rail when the actuator extends from the lower limit position of the lifting platform. .

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