JP2010260709A - Lift device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lift device for lifting by the vertical expansion of link mechanisms, without sliding a lower end part of the link mechanisms to a baseplate. <P>SOLUTION: This lift device includes a pair of tables 10, the baseplate 20 and a pair of link mechanisms 30. The pair of link mechanisms 30 are respectively constituted of a main link part 31 formed by respectively separately arranging parallelogram links 32L and 32R of upper-lower two stages in the lateral direction and an auxiliary link part 32 formed by laterally separately arranging a left auxiliary link 41L and a right auxiliary link 41R. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a lift device that lifts and lowers a vehicle or the like.

  Vehicle lift devices that raise and lower a vehicle for vehicle inspection and maintenance are known (for example, Patent Documents 1 to 6).

  The lift for vehicle maintenance described in Patent Document 1 includes a table on which a vehicle is mounted, a base plate, and a link type lifting drive device that links the upper and lower ends to the table and the base plate and moves the table up and down in a horizontal posture. And. The link type lifting drive includes a long link whose upper and lower ends are linked to the table and the base plate, a λ-type link having a short link linked to the middle of the long link and the base plate, and upper and lower ends. And a hydraulic cylinder that is linked to the long link and the base plate to raise and lower the long link. The upper end of the long link is connected to the table with a pin, the lower end of the long link is slidably connected to the table, the upper end of the short link is connected to the middle of the long link with a pin, and the lower end of the long link is It is connected to the table with pins.

  The lifts for vehicle maintenance disclosed in Patent Documents 2 to 6 have substantially the same basic structure, and are a table on which a vehicle is placed, a base plate, and upper and lower ends are linked to the table and the base plate. And a link type lifting drive device that moves up and down in a horizontal posture. The link type lifting drive device is composed of a pantograph link formed by assembling a link assembled in X in two stages, and further connecting a pair of two-stage assembled links assembled in X in parallel in the vehicle width direction, a pantograph link and a base plate And a hydraulic cylinder that expands and contracts the pantograph link in the vertical direction. The upper and lower ends of one side of the pantograph link are slidably connected to the table. Patent Document 6 also mentions that a pair of left and right hydraulic cylinders are extended and contracted in synchronization.

JP 7-309598 A JP-A-8-73194 JP-A-8-333094 JP 10-330092 A JP-A-11-130383 JP 2001-89086 A

  In the vehicle maintenance lift disclosed in Patent Documents 1 to 6, the lower end of the long link or the lower end of the same side of the pantograph link is slidably connected to the table. Therefore, when floor cleaning is performed, water and dust enter and accumulate, and the slide mechanism may become difficult to function, and the floor cleaning water and vehicle cleaning water may cause problems on the slide part. There is also a problem that the lower support moves to a narrower side and lacks stability, or in a pair of left and right lift devices, the degree of elevation is different between the left and right.

  In view of the above problems, an object of the present invention is to provide a lift device that can move up and down by vertical expansion and contraction of the link mechanism without sliding the lower end portion of the link mechanism relative to the base plate.

  To achieve the above object, the present invention provides a pair of left and right tables that are long in the front-rear direction and a base plate, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate. A lift device comprising a pair of link mechanisms that hold a pair of tables in a horizontal posture and move up and down synchronously, wherein the lower ends of the pair of link mechanisms are swingably connected to a base plate. To do.

  A specific first configuration of the present invention includes a pair of left and right tables that are long in the front-rear direction and a base plate, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate. And a pair of link mechanisms that move up and down synchronously while holding the pair of tables in a horizontal posture. Each of the pair of link mechanisms is formed by bending an upper link and a lower link at a shaft portion. Two upper and lower parallelogram links connected to each other are arranged separately in the front-rear direction and the left-right direction, and the parallelogram links in the front-rear direction are connected by horizontal holding links, and the parallelogram in the left-right direction The links are connected by left and right connecting links, the upper ends of the X side links are pivotally attached to a pair of tables, and the lower ends of the lower links are base plates. The auxiliary links formed by bending and connecting the pivoted main link part, the upper auxiliary link and the lower auxiliary link are arranged separately in the left-right direction, and the upper auxiliary links are separated from each other by the upper links. Connected at the left and right shafts to form an X link, the upper end of the upper auxiliary link is connected to one of the pair of tables so as to be slidable in the front-rear direction, and the lower end of the upper auxiliary link is the upper side The upper auxiliary links that are connected to the upper ends of the lower auxiliary links that are half the length of the auxiliary links, are connected to the lower links, and are spaced apart in the left-right direction. And / or an auxiliary link portion in which the lower auxiliary links are connected to each other by a link for left and right connection.

  A specific second configuration of the present invention includes a pair of left and right tables that are long in the front-rear direction and a base plate, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate. A lift device comprising a pair of link mechanisms that hold a pair of tables in a horizontal position and move up and down synchronously, and each of the pair of link mechanisms is provided on a middle horizontal lift plate and a base plate. A lower X link mechanism that expands and contracts in the vertical direction while keeping the lifting plate horizontal, and an upper X link mechanism that extends and contracts in the vertical direction while keeping one of the pair of tables provided on the middle horizontal lifting plate horizontal. The lower link mechanism has a lower three-dimensional X link, and the four upper ends of the lower three-dimensional X link The four lower ends of the lower three-dimensional X link are connected to the base plate with two left and right swing short links and two right and left fixed short links. The upper link mechanism has an upper 3D X link, and the four upper ends of the upper 3D X link have two left and right swinging short links and two left and right fixed shorts on the corresponding one of the pair of tables. The four lower ends of the upper three-dimensional X-link are connected to the middle horizontal lifting plate via two left and right swing short links and two left and right fixed short links. To do.

  According to the present invention, since the link mechanism is pivotally connected to the base plate, the slide structure of the link lower end portion of the link mechanism and the base plate which has been conventionally used is not employed. Therefore, it is possible to eliminate the conventional problems that the dust accumulated on the roller in the slide mechanism is caught and the roller becomes difficult to move or the lift-up is hindered. Moreover, since the distance between the fulcrums with respect to the base plate of the link mechanism does not change, the stability is improved. Furthermore, since a simple structure is adopted, not only maintenance is facilitated, but also a lift device can be provided at a low cost.

1 is a front view of a lift device according to a first embodiment of the present invention. 1 is a side view of a lift device according to a first embodiment of the present invention. 1 is a plan view of a lift device according to a first embodiment of the present invention. It is process drawing which shows operation | movement of the lift apparatus which concerns on the 1st Embodiment of this invention. It is a front view of the lift apparatus which concerns on the 2nd Embodiment of this invention. It is a side view of the lift apparatus which concerns on the 2nd Embodiment of this invention. It is process drawing which shows operation | movement of the lift apparatus which concerns on the 2nd Embodiment of this invention.

  Hereinafter, the first and second embodiments of the present invention will be described with reference to the drawings, particularly in the case of a vehicle lift device for lifting a vehicle. The technical scope of the present invention should not be limited to the embodiments to be described later. Particularly, modifications to the illustrated shapes and the like also belong to the technical scope of the present invention, and various things other than vehicles. It can also be applied when moving up and down.

(First embodiment)
1 to 3 show a lift device 1 according to a first embodiment. FIG. 1 is a front view, FIG. 2 is a side view, and FIG. 3 is a plan view. As shown in FIGS. 1 to 3, the lift device 1 has a bilaterally symmetric structure, and the left lift device 1 </ b> L and the right lift device 1 </ b> R are separated from each other with a predetermined interval. Here, left and right correspond to the vehicle width direction of the vehicle that moves up and down. The left lift device 1L places the left portion of the vehicle, and the right lift device 1R places the right portion of the vehicle.

  The lift device 1 includes a pair of tables 10 that are long in the front-rear direction, a pair of base plates 20, a pair of link mechanisms 30, and a pair of cylinders 50.

  The pair of tables 10 includes a left table 10L and a right table 10R, and the left and right tables 10L and 10R are both a table body 11 that is long in one direction, specifically in the longitudinal direction of the vehicle, and the table body. 11 and the front and rear plates 12 and 13 attached to be slidable back and forth. The upper portions of the plates 12 and 13 have depressions 12A and 13A, respectively, and an operator can turn and slide the plates 12 and 13 before and after by placing a hand on the depressions 12A and 13A. The upper part of each plate 12 and 13 has receiving part 12B and 13B. The support portion 5 is inserted into the receiving portions 12B and 13B, and as will be described later, the support portion 5 directly contacts the lift point of the vehicle C and lifts the vehicle C (see FIG. 4). The table body 11 is provided with ribs 14L and 14R on the left and right. The left and right guide grooves 15L and 15R are laid in the left and right ribs 14L and 14R in the front-rear direction, and the guide roller 16 travels in the front-rear direction along each of the left and right guide grooves 15L and 15R.

  As shown in FIG. 2, the pair of base plates 20 are laid with anchors (not shown) on the bottom surface G of the pit P, for example, with the left and right base plates 20L and 20R spaced apart from each other by a predetermined distance (see FIG. 4). . The pair of base plates 20 may be a single plate without being separated into left and right. The following description will be made on the assumption that the left and right are separated.

  The pair of link mechanisms 30 includes a pair of left and right link mechanisms 30L and 30R. The left link mechanism 30L has an upper end portion corresponding to one of the pair of tables 10, that is, the left table 10L, and a lower end portion connected to the left base plate 20L. The right link mechanism 30R has an upper end connected to one of the pair of tables 10, that is, the right table 10R, and a lower end connected to the right base plate 20R. The left and right link mechanisms 30L and 30R move up and down synchronously while holding the left and right tables 10L and 10R in a horizontal posture.

  Each of the pair of left and right link mechanisms 30L and 30R includes a main link portion 31 and an auxiliary link portion 41. The main link portion 31 is configured by connecting a plurality of links that are spaced apart from each other on the left and right, and the auxiliary link portion 41 is configured by connecting a plurality of links that are spaced apart on the left and right. Those that make a pair on the left and right have L and R attached to the reference numerals. Also, for the sake of explanation, the links installed on the front side and the left side, the links installed on the rear side and the left side, the links installed on the front side and the right side, the links installed on the rear side and the right side, Numbers 1, 2, 3, and 4 are used, and A, B, C, and D are added to the codes indicating the links in order to distinguish the links.

  The main link part 31 is demonstrated. Upper and lower two-stage parallelogram links 32L and 32R are spaced apart in the left-right direction.

  The configuration of the upper and lower two-stage parallelogram links 32L arranged on the left side is as follows. The first upper link 33A and the first lower link 34A are connected so as to be bendable at the first shaft portion 35A, and the second upper link 33B and the second lower link 34B are the second shaft portion. It is connected to bendable at 35B. The first shaft portion 35A and the second shaft portion 35B are connected by a horizontal holding link 36L while maintaining the inter-axis distance L1. The upper ends of the first upper link 33A and the second upper link 33B are pivotally connected to the left rib 14L of the tables 10L and 10R with a distance L1 in the front-rear direction. The lower ends of the first lower link 34A and the second lower link 34B are swingably connected to the base plates 20L and 20R at a distance L1 in the front-rear direction. The first and second brackets 21A and 21B are attached to the left edges of the base plates 20L and 20R, respectively, with a distance L1 therebetween in the front-rear direction, and the first and second lower links 34A, 34B is connected so that the first and second brackets 21A and 21B can swing.

  The configuration of the upper and lower two-stage parallelogram links 32R arranged on the right side is as follows. The third upper link 33C and the third lower link 34C are connected to be bent at the third shaft portion 35C, and the fourth upper link 33D and the fourth lower link 34D are the fourth shaft portion. It is connected to bendable at 35D. The third shaft portion 35C and the fourth shaft portion 35D are connected by a horizontal holding link 36R while maintaining the inter-axis distance L1. The upper ends of the third upper link 33C and the fourth upper link 33D are pivotally connected to the right rib 14R of the tables 10L, 10R with a distance L1 in the front-rear direction. The lower ends of the third lower link 34C and the fourth lower link 34D are swingably connected to the base plates 20L and 20R at a distance L1 in the front-rear direction. The third and fourth brackets 21C and 21D are attached to the right edge of the base plates 20L and 20R with a distance L1 in the front-rear direction, and the third and fourth lower links 34C and 34D. The third and fourth brackets 21C and 21D are connected so as to be swingable.

  As shown in FIG. 1 and FIG. 2, in the upper and lower two-stage parallelogram links 32L and 32R arranged separately on the left and right, the second upper link 33B and the fourth upper link 33D are Between the two lower links 34B and the fourth lower link 34D, one or more, preferably a plurality of left and right connecting links 36 are attached at intervals in the vertical direction. It should be noted that one or more left and right connecting links 36 are provided between the first upper link 33A and the third upper link 33B, and between the first lower link 34A and the third lower link 34C. May be.

  The auxiliary link unit 41 will be described. The left auxiliary link 41L and the right auxiliary link 41R are spaced apart from each other on the left and right.

  The left auxiliary link 41L is formed by connecting an upper auxiliary link 42L and a lower auxiliary link 43L by bending at a shaft portion 44L. The right auxiliary link 41R is formed by bending an upper auxiliary link 42R and a lower auxiliary link 43R by bending at a shaft portion 44R. These left and right shaft portions 44L, 44R may be configured by a single right and left connecting link 44. Here, the lower auxiliary links 43L and 43R have half the length in the longitudinal direction of the upper auxiliary links 42L and 43R.

  The upper auxiliary links 42L and 42R are connected to the second and fourth upper links 33B and 33D by the left and right shaft portions 45 to form an X link. The left and right shaft portions 45 are provided at equidistant positions from the upper and lower end portions of the upper auxiliary links 42L and 42R, and are provided at equidistant positions from the upper and lower end portions of the second and fourth upper links 33B and 33D. It is preferred that

  The above-described guide roller 16 is rotatably attached to the upper ends of the upper auxiliary links 42L and 42R, and the upper auxiliary links 42L and 42R slide in the front-rear direction along the pair of left and right guide grooves 15L and 15R. .

  The lower ends of the lower auxiliary links 43L and 43R are connected to the second and fourth lower links 34B and 34D so as to be swingable by the shaft portions 45L and 45R. These left and right shaft portions 45L and 45R may be formed of one left and right connecting link 46.

  Each of the pair of cylinders 50 includes a cylinder body 51 and a piston 52 with a rod. A cylinder mounting bracket 53 is attached to each of the left and right base plates 20L and 20R at a substantially central position on the left and right sides opposite to the positions of the first to fourth brackets. The bottom part is attached so that rocking | fluctuation is possible. The rod end 52A protruding from the cylinder body 51 of the piston 52 with the rod is swingably connected to a left and right connecting link 44 that connects the upper auxiliary links 42L and 42R and the lower auxiliary links 43L and 43R. Yes. The left and right cylinders 50L and 50R constituting the pair of cylinders 50 may be hydraulic or pneumatic. For example, the left and right cylinders 50L and 50R constitute a parent-child cylinder, and each rod of the left and right cylinders 50L and 50R The attached piston 52 extends in synchronism with the same length on the left and right. Although not shown, a power source is disposed in the space between the left and right base plates 20L and 20R.

  As described above, the pair of left and right link mechanisms 30L and 30R include the main link portion 31 composed of the upper and lower two-stage parallelogram links 32L and 32R, and the auxiliary link portion that constitutes an X link with a part of the main link portion 31. 41. The auxiliary link portion 41 may be referred to as a lifting drive force input link because the power from either the left or right cylinder 50L, 50R is transmitted. As described above, the main link portion 31 connects the lower links 34 </ b> B and 34 </ b> D arranged in the left-right direction of the table 10 with the left-right connection link 36, and is arranged in the left-right direction of the table 10. Since the upper links 33B and 33D are connected by the left and right connecting links 36, the main link portion 31 has rigidity. In the main link portion 31 and the auxiliary link portion 41, the second upper link 33B, the second lower link 34B, the upper auxiliary link 42L, and the lower auxiliary link 43L form a rhombus link.

The operation of the lift device 1 according to the first embodiment of the present invention will be described.
Each of the pair of cylinders 50 expands and contracts in synchronization with the left and right pistons 52 with rods. Then, the left and right link mechanisms 30L and 30R move up and down while keeping the left and right tables 10L and 10R in a horizontal posture. FIG. 4 is a process diagram schematically showing the operation of the lift device 1 according to the first embodiment. As shown in FIG. 4A, when the piston 52 with the rod is contracted, the lift device 1 is housed in the pit P, and the pair of tables 10L and 10R coincides with the road surface. In this state, the vehicle C is arranged so that the vehicle C straddles the pair of left and right tables 10L and 10R, and the height is adjusted by the support portion 5 in the receiving portions 12B and 13B of the plates 12 and 13. When the plates 12 and 13 are lifted by the pair of left and right link mechanisms 30L and 30R, the support unit 5 comes into contact with the lift point of the vehicle C and lifts the vehicle C. Thereafter, when the left and right cylinders 50L and 50R are operated and the rod-attached piston 52 extends, the auxiliary link portion 41 rises while shifting to the front side, and the left and right shaft portion 45 rises. As a result, the left and right tables 10 are moved up and down while being held in a horizontal posture by the two-sided parallelogram links 32L and 32R. Here, as shown in FIGS. 1 and 2, the upper auxiliary links 42L and 42R support the left and right tables 10 together with the upper and lower two-stage parallelogram links 32L and 32R. The lower auxiliary links 43L and 43R function to distribute the force of the left and right cylinders 50L and 50R over the entire upper and lower parallelogram links 32L and 32R. As shown in FIG. 1, the left and right cylinders 50L and 50R are not arranged upright in the vertical direction but are inclined to the base plate 20, and thus not only the pair of link mechanisms 30L and 30R. The tables 10L and 10R and the vehicle C are also supported by the cylinders 50L and 50R.

  According to the lift device 1 according to the first embodiment, the lower ends of the pair of link mechanisms 30 are swingably attached to the base plate 20 and the brackets 21A, 21B, 21C, 21D, and 53. Therefore, unlike the prior art, a slide mechanism composed of a guide rail, a roller, or the like is not provided on the base plate, so that it is not necessary to maintain the roller so as to travel stably in the pit P.

(Second Embodiment)
5 and 6 show a lift device 2 according to a second embodiment of the present invention, FIG. 5 is a front view, and FIG. 6 is a side view. The plan view is the same as FIG. Similar to the first embodiment, the lift device 2 according to the second embodiment has a symmetrical structure, and includes a pair of tables 10, a base plate 20, and a pair of link mechanisms 60. About a pair of table 10 and the baseplate 20, it is the same as that of the case of 1st Embodiment, and the points of a pair of link mechanism 60 differ.

  In the second embodiment, the pair of link mechanisms 60 includes a left link mechanism 60L and a right link mechanism 60R. Each link mechanism 60 </ b> L, 60 </ b> R has an upper end connected to a corresponding one of the pair of tables 10, that is, a left table 10 </ b> L and a right table 10 </ b> R, and a lower end connected to the base plate 20. The pair of link mechanisms 60 is the same as the first embodiment in that the pair of tables 10L and 10R are moved up and down synchronously while being held in a horizontal posture.

The left and right link mechanisms 60L and 60R will be described in detail.
Each of the link mechanisms 60L and 60R has the same structure, and includes a middle horizontal lifting plate 70, a lower link mechanism 61 disposed between the middle horizontal lifting plate 70 and the base plate 20, and a middle horizontal lifting plate. 70 and an upper link mechanism 71 disposed between the left and right tables 10L and 10R.

  The lower link mechanism 61 has a lower three-dimensional X-link 62 and extends and contracts in the vertical direction while keeping the middle horizontal elevating plate 70 horizontal provided on the base plate 20. The lower three-dimensional X link 62 has four ends on the upper and lower sides. The upper, lower, left and right upper ends 63A, 63B, 63C, 63D of the lower three-dimensional X-link 62 are intermediate stages with either one of the two left and right swinging short links 64L, 64R and the two left and right fixed short links 65L, 65R. It is connected to the horizontal elevating plate 70. The four lower ends 66A, 66B, 66C, 66D of the lower three-dimensional X link 62 are attached to the base plate 20 via either one of the two left and right swinging short links 67L, 67R and the two left and right fixed short links 68L, 68R. It is connected.

  In particular, the case shown in FIGS. 5 and 6 will be described. In the left and right base plates 20L and 20R, fixed short links 68L and 68R are respectively attached to the left and right sides of the front side so as to extend vertically upward. Front left and right lower end portions 66A and 66C of 62 are connected to left and right fixed short links 68L and 68R, respectively. In the left and right base plates 20L and 20R, swing short links 67L and 67R are swingably attached to the left and right sides of the rear side, respectively, and lower left and right lower end portions 66B and 66D of the lower three-dimensional link 62 are swing back and forth links, respectively. It is connected to 67L and 67R.

Fixed short links 65L and 65R are attached to the rear left and right sides of the lower surface of the middle horizontal elevating plate 70 so as to extend vertically downward, and the rear left and right upper ends 63B and 63D of the lower three-dimensional X link 62 are left and right. The fixed short links 65L and 65R are respectively connected.
The swinging short links 64L and 64R are swingably attached to the front left and right sides of the lower surface of the middle horizontal elevating plate 70, and the front left and right upper ends 63A and 63C of the lower three-dimensional link 62 are swinging short links 64L and 64R, respectively. Connected to

  The upper link mechanism 71 has an upper three-dimensional X-link 72 and is provided on the middle horizontal elevating plate 70 and corresponds to one of the pair of tables 10, that is, while keeping the left and right tables 10L and 10R horizontal. It expands and contracts in the vertical direction. The upper three-dimensional X link 72 has four ends on the upper and lower sides. The four upper end portions 73A, 73B, 73C, 73D of the upper three-dimensional X link 72 correspond to either the left or right table via two left and right swinging short links 74L, 74R and two left and right fixed short links 75L, 75R. 10L and 10R are connected. The four lower ends 76A, 76B, 76C, and 76D of the upper three-dimensional X link 72 are intermediate horizontal horizontal lifting plates with one of two left and right swinging short links 77L and 77R and two left and right fixed short links 78L and 78R interposed therebetween. 70.

  In particular, the case shown in FIGS. 5 and 6 will be described. The fixed short links 78L and 78R are vertically arranged on the left and right sides of the upper surface of the middle horizontal elevating plate 70 so that the middle horizontal elevating plate 70 is symmetrical between the upper surface and the lower surface. It is attached so as to extend upward, and the lower left and right lower ends 76B and 76D of the upper three-dimensional X link 72 are connected to the left and right fixed short links 78L and 78R, respectively. In the left and right tables 10L and 10R, swinging short links 74L and 74R are swingably attached to the left and right sides of the rear side, respectively, and the front left and right lower ends 73A and 73C of the upper three-dimensional X link 72 are respectively swinging short links 74L. , 74R.

  Swing short links 77L and 77R are swingably attached to the front left and right of the upper surface of the middle horizontal lifting plate 70, and the front left and right lower end portions 73A and 73C of the upper three-dimensional X link 72 are the left and right swing short links. 77L and 77R are connected to each other. In the left and right tables 10L and 10R, fixed short links 75L and 75R are attached to the front left and right, respectively, extending vertically downward, and the upper left and right upper ends 73B and 73D of the upper stereoscopic X link 72 are fixed short links, respectively. It is connected to 75L and 75R.

  Left and right swing short links 74L and 74R that connect the upper three-dimensional X link 72 and one of the pair of tables 10L and 10R, and left and right that connect the upper three-dimensional X link 72 and the middle horizontal lifting plate 70 The two swinging short links 77L and 77R are preferably arranged on the opposite side in the longitudinal direction of the pair of tables 10, that is, in the front-rear direction. That is, in FIGS. 5 and 6, the fixed short links are arranged at the positions where the swinging short links 64L, 64R, 67L, 67R, 74L, 74R, 77L, 77R are arranged, and the fixed short links 65L, 65R, Needless to say, the front and rear may be reversed so that the swing short link is disposed at the position where 68L, 68R, 75L, 75R, 78L, 78R is disposed.

  The same applies to the lower three-dimensional X link 62, and two left and right swinging short links 64L and 64R that connect the lower three-dimensional X link 62 and the middle horizontal lifting plate 70, and the lower three-dimensional X link 62 and the base plate. The left and right swinging short links 67L and 67R that connect 20L and 20R are preferably arranged on the opposite side in the longitudinal direction of the pair of tables 10, that is, in the front-rear direction.

  As described above, it is preferable that the short links that are different in the front and rear are arranged in the front-rear direction and the same short link is arranged in the left-right direction with respect to the arrangement relationship between the swing short link and the fixed short link. This is because when the lower three-dimensional X link 62 and the upper three-dimensional X link 72 are expanded or contracted in the vertical direction, the middle horizontal elevating plate 70 and the left and right tables 10L and 10R both move up and down while maintaining a horizontal posture.

  Here, as shown in FIGS. 5 and 6, the lower three-dimensional X link 62 and the upper three-dimensional X link 72 are both left and right outer links 81L and 81R, and outer links. The left and right inner links 82L and 82R that are spaced apart from each other on the inner side of 81L and 81R are pivotally connected by one left and right connecting link 83. Further, the outer links 81L and 81R and the inner links 82L and 82R may be connected by left and right connecting links (not shown) separately from the pivot points. This is because each of the lower three-dimensional X link 62 and the upper three-dimensional X link 72 expands and contracts more stably.

  Here, the lower link mechanism 61 is deformed so that the lower three-dimensional X link 62 becomes higher because the inclination angle α of the swinging short links 64L, 64R, 67L, and 67R is maintained in a complex angle relationship in parallel lines. Even if it is deformed so as to be lowered, the middle horizontal elevating plate 70 is kept parallel to the base plate 20. Since the upper link mechanism 71 has the same configuration as the lower link mechanism 61, the upper link mechanism 71 is supported by the middle horizontal lifting plate 70 and holds the table 10 parallel to the middle horizontal lifting plate 70.

  Each of the pair of cylinders 90 includes a cylinder body 91 and a piston 92 with a rod. The cylinder mounting bracket 93 is disposed on each of the left and right base plates 20L and 20R. In detail, the cylinder mounting bracket 93 is arranged so as to be separated from the point vertically below the left and right connecting links 83 of the upper three-dimensional X link 72 in either the front or rear direction, in the illustrated case, rearward. A lower end portion of the cylinder body 91 is swingably supported by the cylinder mounting bracket 93. A rod end 92A protruding from the cylinder body 91 of the piston 92 with the rod is swingably connected to the left and right connecting link 83 of the upper three-dimensional X link 72. The left and right cylinders 90L and 90R constituting the pair of cylinders 90 may be hydraulic or pneumatic. For example, the left and right cylinders 90L and 90R constitute a parent-child cylinder, and each rod of the left and right cylinders 90L and 90R The attached piston 92 extends in synchronism with the left and right by the same length. Although not shown, a power source is disposed in the space between the left and right base plates 20L and 20R.

  An operation of the lift device 2 according to the second embodiment will be described. Each of the pair of cylinders 90 expands and contracts in synchronization with the left and right pistons 92 with rods. Then, the pair of left and right link mechanisms 60L and 60R move up and down while keeping the left and right tables 10L and 10R in a horizontal posture. FIG. 7 is a process diagram schematically showing the operation of the lift device 2 according to the second embodiment. As shown in FIG. 7A, when the piston with rod 92 is in a contracted state, the lift device 2 is housed in the pit P, and the pair of tables 10L and 10R coincide with the road surface. In this state, the vehicle (not shown) is arranged so that the vehicle straddles the pair of left and right tables 10L, 10R, and the receiving portions 12B, 13B of the plates 12, 13 are supported by support portions (not shown). Adjust. When the plates 12 and 13 are lifted by the left and right link mechanisms 60L and 60R, the support portion comes into contact with a lift point of a vehicle (not shown) and lifts the vehicle. Thereafter, when the pair of cylinders 90 are operated and the piston 92 with the rod extends, the lower link mechanism 61 and the upper link mechanism 71 extend and rise in the order shown in FIGS. 7B, 7C, and 7D. The middle horizontal elevating plate 70 and the pair of tables 10 rise while being maintained in a horizontal posture.

  In the lift device 2 according to the second embodiment, each of the pair of link mechanisms 60 is provided on the middle horizontal lifting plate 70 and the base plate 20 so as to extend and contract in the vertical direction while keeping the middle horizontal lifting plate 70 horizontal. A side X link mechanism 61 and an upper X link mechanism 71 that is provided on the middle horizontal elevating plate 70 and that expands or contracts in the vertical direction while keeping one of the pair of tables 10 corresponding to the horizontal are provided. Therefore, unlike the prior art, a slide mechanism composed of a guide rail, a roller, or the like is not provided on the base plate, so that it is not necessary to maintain the roller so that it runs stably in the pit.

  In both the first and second embodiments of the present invention, each link mechanism is pivotally connected to the base plate 20. That is, a slide mechanism in which the lower end portion of the link travels with respect to the base plate is unnecessary. Therefore, the conventional problems can be solved.

1, 2: Lift device 5: Support portion 1L, 2L: Left lift device 1R, 2R: Right lift device 10: A pair of tables 10L, 10R: Table 11: Table body 11A: Top plate 12, 13: Plates 12A, 13A : Depressions 12B, 13B: receiving portions 14L, 14R: ribs 15L, 15R: guide grooves 16: guide rollers 20: a pair of base plates 20L, 20R: base plates 21A, 21B, 21C, 21D brackets 30: a pair of link mechanisms 30L, 30R : Link mechanism 31: Main link portion 32: Auxiliary link portion 32L, 32R: Upper and lower two-stage parallelogram links 33A, 33B, 33C, 33D: Upper links 34A, 34B, 34C, 34D: Lower links 35A, 35B, 35C, 35D: Shaft portion 36: Left and right connecting links 36L, 36R: Horizontal holding Link 41: Auxiliary link portion 41L, 41R: Auxiliary link 42L, 42R: Upper side auxiliary link 43L, 43R: Lower side auxiliary link 44, 46: Left and right connecting links 44L, 44R: Shaft portions 45, 45L, 45R: Left and right shaft portions 50, 90: A pair of cylinders 50L, 50R, 90L, 90R: Cylinder 51, 91: Cylinder main body 52, 92: Rod-attached piston 52A, 92A: Rod-attached piston tip 53, 93: Cylinder mounting bracket 60: Pair Link mechanism 60L, 60R: Link mechanism 61: Lower link mechanism 62: Lower three-dimensional X links 63A, 63B, 63C, 63D: Upper ends 64L, 64R of lower three-dimensional X links: Swing short links 65L, 65R: Fixed short links 66A, 66B, 66C, 66D: lower end portions 67L, 67R of the lower three-dimensional X link Swing short links 68L and 68R: Fixed short link 70: Middle horizontal elevating plate 71: Upper link mechanism 72: Upper 3D X links 73A, 73B, 73C, 73D: Upper ends 74L, 74R, 77L, 77R of the upper 3D X links : Swing short links 75L, 75R, 78L, 78R: Fixed short links 76A, 76B, 76C, 76D: Lower end portions 81L, 81R of the upper three-dimensional X link: Outer links 82L, 82R: Inner links 83: Left and right connecting links C: Vehicle G: Bottom P: Pit

Claims (8)

A pair of tables and a base plate that are long in the front-rear direction, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate, and holding the pair of tables in a horizontal position In a lift device comprising a pair of link mechanisms that move up and down in synchronization,
A lift device, wherein lower ends of the pair of link mechanisms are swingably connected to the base plate. A pair of tables and a base plate that are long in the front-rear direction, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate, and holding the pair of tables in a horizontal position In a lift device comprising a pair of link mechanisms that move up and down in synchronization,
Each of the pair of link mechanisms includes upper and lower two-stage parallelogram links formed by bending and connecting the upper link and the lower link at the shaft portion, and are arranged separately in the front-rear direction and the left-right direction, and The parallelogram links in the front-rear direction are connected by a horizontal holding link, the parallelogram links in the left-right direction are connected by a link for left-right connection, and the upper ends of the X side links are pivotally attached to a pair of tables. And the lower link is pivotally attached to the base plate, and the auxiliary link formed by bending and connecting the upper auxiliary link and the lower auxiliary link is spaced apart in the left-right direction. The upper auxiliary links are connected to each other at the left and right shafts to form an X link, and the upper ends of the upper auxiliary links The lower auxiliary link is connected to the upper end of the lower auxiliary link that is half the length of the upper auxiliary link, and is The auxiliary | assistant which connects the lower end part of the side auxiliary link with the said lower side link, and connects the said upper side auxiliary links and / or the said lower side auxiliary links which are arrange | positioned spaced apart in the left-right direction. And a link unit.   Each of the pair of link mechanisms has a cylinder composed of a cylinder body and a piston with a rod, and a tip portion of a rod protruding from the cylinder body connects the upper auxiliary link and the lower auxiliary link. The lift device according to claim 2, wherein the lift device is connected to a left-right connection link. A pair of tables and a base plate that are long in the front-rear direction, each having an upper end connected to a corresponding one of the pair of tables and a lower end connected to the base plate, and holding the pair of tables in a horizontal position In a lift device comprising a pair of link mechanisms that move up and down in synchronization,
Each of the pair of link-type mechanisms includes a middle horizontal lifting plate, a lower X link mechanism provided on the base plate and extending in the vertical direction while keeping the middle horizontal lifting plate horizontal, and the middle horizontal lifting plate An upper X-link mechanism that extends and contracts in the vertical direction while keeping one of the pair of tables corresponding to the horizontal.
The lower link mechanism has a lower three-dimensional X link, and the four upper ends of the lower three-dimensional X link have two left and right swinging short links and two left and right fixed short links on the middle horizontal lifting plate. Four lower ends of the lower three-dimensional X link are connected to the base plate with two left and right swinging short links and two left and right fixed short links,
The upper link mechanism has an upper three-dimensional X link, and four upper ends of the upper three-dimensional X link have two left and right swinging short links and two left and right fixed short links on one side of the pair of tables. The four lower ends of the upper three-dimensional X-link are connected to the middle horizontal elevating plate via two left and right swinging short links and two left and right fixed short links. , Lift device.   The two left and right swing short links that connect the upper X link and one of the pair of tables, and the two left and right swing shorts that connect the upper X link and the middle horizontal lifting plate. The lift device according to claim 4, wherein the link is disposed on the opposite side in the longitudinal direction of the pair of tables.   The two left and right swing short links that connect the lower X link and the middle horizontal lifting plate, and the two left and right swing short links that connect the lower X link and the base plate are the pair. The lift device according to claim 4, wherein the lift device is disposed on the opposite side in the longitudinal direction of the table.   The upper three-dimensional X link and the lower three-dimensional X link are both formed by pivotally connecting a pair of an outer link and an inner link that are spaced apart from each other on the left and right. Item 7. The lift device according to any one of Items 4 to 6.   Each of the pair of link mechanisms has a cylinder composed of a cylinder body and a piston with a rod, and a tip end of a rod protruding from the cylinder body is connected to a connection ring in the upper three-dimensional X link. The lift device according to any one of claims 4 to 7, wherein the lift device is characterized.

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