JP2002145588A - Lift - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a large fluctuation stroke. SOLUTION: This lift is provided with a first support substrate 1, a second support substrate 2, an intermediate guide member 3 arranged between the first and second support substrates 1 and 2, a first arm 4 rotatably connecting the intermediate guide member 3 and the first support substrate 1, a second arm 5 rotatably connecting the intermediate guide member 3 and the second support substrate 2, a driving means 6 movably driving the intermediate guide member 3, and an initial releasing means 7 capable of moving the first and second support substrates 1 and 2 in the separating direction merely with the driving force of the driving means 6 by initially moving tip sections 4b and 5b in the separating direction when the first and second support substrates 1 and 2 cannot be moved in the separating direction by only the driving force of the driving means 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lift for lifting and lowering a person or an object.

2. Description of the Related Art As a lift of this type, for example, two links arranged in an X-shape are rotatably connected at the intersection thereof, and the inclination of each link is changed by a hydraulic cylinder or the like, thereby increasing the overall height. There is known a configuration in which the length can be changed. The lift configured as described above allows not only simple lifting and lowering of luggage, but also movement of a wheelchair at a step, supporting a conveyor from below to adjust its height, and heightening a work table. It is used in every field, such as making it adjustable.

However, in the above-mentioned lift, there is a problem that the links must always be arranged in an X-shape, and a variable stroke cannot be made large. The present invention has been made in view of the above circumstances, and has an object to develop a lift capable of obtaining a large variable stroke.

Means for Solving the Problems To solve the above problems, the invention according to claim 1 comprises a first support base (1),
A second support base (2) disposed at a position overlapping the first support base (1), and an intermediate guide disposed between the first and second support bases (1, 2). Member (3)
A first end (4a) rotatably connected to the intermediate guide member (3) and a front end (4b) rotatably connected to the first support base (1). Arm (4),
A proximal end (5a) is rotatably connected to the intermediate guide member (3), and a distal end (5b) is connected to the second support base (2).
A second arm (5) rotatably connected to the first and second support bases (1, 2) when the first and second support bases (1, 2) move so as to be separated from each other; (4,5)
Driving means (6) for driving the intermediate guide member (3) to move in the direction in which the intermediate guide member (3) moves via
Each end (4) of the first and second arms (4, 5)
b, 5b) approach each other and cannot move the first and second support bases (1, 2) away from each other only by the driving force from the driving means (6). By initially moving the tip portions (4b, 5b) in the direction away from each other, it is possible to move the first and second support bases (1, 2) in the direction away from each other only by the driving force. And an initial opening means (7). According to a second aspect of the present invention, in the first aspect of the present invention, at least two first arms (4) are arranged in parallel with the intermediate guide member (3), so that the first support base (1) is provided. ) And the intermediate guide member (3) are configured to move in parallel with each other, and at least two second guide members are provided with respect to the intermediate guide member (3).
The first and second support bases are configured by arranging the arms (5) in parallel so that the second support base (2) and the intermediate guide member (3) move in parallel with each other. (1) and (2) are configured to move while keeping parallel to each other. According to a third aspect of the present invention, in the second aspect of the invention, two intermediate guide members (3) are arranged along a moving direction of the intermediate guide member (3), and the driving means (6) is provided between one and the other of the intermediate guide members. The first guide members (3, 3) connected to the respective intermediate guide members (3) are driven by moving the guide members (3, 3) so as to move away from each other.
And the first and second support bases (1, 2) are moved in a direction in which the first and second support bases (1, 2) are separated from each other via the second arm (4, 5). According to a fourth aspect of the present invention, in the third aspect, the driving means (6) is provided.
Is a tip (4) of each of the first and second arms (4, 5).
b, 5b) are configured to have an idle drive section (d) that does not exert a drive force on either side of the one or the other intermediate guide member (3) in the closest state, The opening means (7) is moved from one intermediate guide member (3) side to the other intermediate guide member (3) side by the driving force of the driving means (6) in the idle drive section (d), and the one and the other. The first and second arms (4, 5) of the respective intermediate guide members (3, 3) are widened between the first arm (4) and the second arm (5).
Is characterized in that it is configured to initially widen the tip portions (4b, 5b). The invention according to claim 5 is the invention according to claim 4, wherein the initial opening means (7).
The opening force transmitting member (71) provided at a predetermined position between the base end (4a, 5a) and the front end (4b, 5b) of each of the first and second arms (4, 5). And a first opening member (72) that is moved and driven by the driving force of the driving means (6) in the idle driving section (d) and bites between the opening force transmitting members (71) on the one intermediate guide member (3) side. ) And the opening force transmission member (71) on the other intermediate guide member (3) side.
In order to maintain the parallel state of the second opening member (73) biting between the first and second support bases (1, 2),
And an automatic adjustment mechanism (74) that balances the bite amount of each of the second opening members (72, 73). According to a sixth aspect of the present invention, in the fifth aspect of the present invention, the automatic adjustment mechanism (74) includes a support member (74a) that is moved and driven by the driving force of the driving means (6) in the idle driving section (d). A central link (74b) having an intermediate portion rotatably connected to the support member (74a) and a central link (74)
A first link (74) rotatably connected to one end of the first link (b) and having a first opening member (72) at a tip (74f).
c) and a second link (74d) rotatably connecting the base end (74g) to the other end of the center link (74b) and having a second opening member (73) at the front end (74h). ). The invention according to claim 7 is characterized in that, in the invention according to claim 1, 2, 3, 4, 5, or 6, a guide bar (8) for guiding the intermediate guide member (3) in a straight line is provided. I have. According to the first aspect of the present invention, when the intermediate guide member (3) is driven to move using the driving means (6), the first and second arms (4, 5) are driven. It turns around the base end (4a, 5a) on the intermediate guide member (3) side as a fulcrum. At this time, the first and second support bases (1,
The interval between 2) becomes the most open state when the first and second arms (4, 5) are in a state of standing perpendicular to the intermediate guide member (3). That is, when the first support base (1) is placed on, for example, horizontal ground, the second support base (2) is at the highest position. The distance between the first and second support bases (1, 2) is determined when the first and second arms (4, 5) are rotated so as to be parallel to each other or further rotated. First and second arms (4,
When the tip portions (4b, 5b) of 5) can contact each other, the narrowest state is established at that time. That is, the second
Is the lowest position. Therefore, the first
And the second support base (2) can be moved to a height position that makes full use of the length of the second arm (4, 5), and the first and second arms (4, 5) can be moved. Can move the second support base (2) from the parallel state to a lower position where the tip portions abut each other. Therefore, compared to the conventional lift in which the links are arranged in an X-shape, the minimum ground clearance of the second support base (2) is reduced and the maximum ground clearance of the second support base (2) is increased. Can be. That is, a large fluctuation stroke can be obtained. Also, when the distance between the distal ends (4b, 5b) of the first and second arms (4, 5) becomes equal to the distance between the proximal ends (4a, 5a), that is, the first and second arms When the arms (4, 5) are parallel, or when the tips (4b,
When the distance between 5b) is smaller than the distance between the base ends (4a, 5a), that is, when the first and second arms (4, 5) are tilted in opposite directions, the intermediate guide is theoretically possible. Even if the driving force of the driving means (6) is directly applied to the member (3) side, the first support base (1) and the second support base are provided via the first and second arms (4, 5). It is impossible to increase the interval with (2). However, since the initial opening means (7) is provided, even if it is in a parallel state or an inverted state,
The tips (4b, 5) of the first and second arms (4, 5)
b) can be pivoted away from each other, and the distance between the distal ends (4b, 5b) is adjusted to the proximal end (4a, 5a).
It can be wider than the distance between them. That is, after the initial opening means (7) has moved the distal ends (4b, 5b) of the first and second arms (4, 5) away from each other, the intermediate guide member (3) is driven by the driving means (6). ), The first and second support bases (1, 2) can be moved in a direction away from each other. According to the second aspect of the present invention, by providing at least two first arms (4) and two second arms (5), the first support base (1), the intermediate guide member (3) and The three members of the second support base (2) can move in the direction of coming and going while keeping parallel. Therefore, for example, when the first support base (1) is placed on horizontal ground,
The second support base (2) can be moved up and down stably while maintaining the horizontal state. According to the third aspect of the invention, the first and second support bases (1, 2) are kept parallel to one intermediate guide member (3), and the other intermediate guide member (3 ), The first and second support bases (1, 2) are kept parallel, so that
The first and second support bases (1, 2) are moved in parallel in the direction in which the first and second support bases (1, 2) are moved only by moving the one and the other intermediate guide members (3, 3) in the direction in which the first and second support bases (1, 2) are moved in a direction in which the first and second support bases are separated. can do. Moreover, one intermediate guide member (3)
Position where the first and second support bases (1, 2) are supported by the first and second arms (4, 5) on the side, and the first and second sides on the other intermediate guide member (3) side. Arm (4, 5)
Since the position for supporting the first and second support bases (1, 2) does not change, it is possible to always stably support, for example, luggage or the like placed on the second support base (2). it can. On the other hand, in the conventional link in which the links are arranged in an X-shape, as the height increases, the distance between the lower and upper fulcrums narrows and becomes extremely unstable. According to the fourth aspect of the present invention, the state in which the distal ends of the first and second arms (4, 5) are closest to each other (that is, the driving force of the driving means (6) is moved toward the intermediate guide member (3)). In a state where it is impossible to move the first and second support bases (1, 2) in a direction in which the first and second support bases (1, 2) are separated even if they are directly actuated), the one and the other intermediate guide members (3) from the driving means (6). The drive means (6) can be driven freely within the range of the idle drive section (d) since the idle drive section (d) does not exert a driving force on either side of the drive means. Will be. Then, the initial opening means (7) uses the driving force of the driving means (6) which can be freely driven in the idle driving section (d) to initialize the distal ends of the first and second arms (4, 5). It is not necessary to newly provide another drive source for driving the initial opening means (7). Therefore, the structure can be simplified and the cost can be reduced. In the invention described in claim 5, the first opening member (72) and the second opening member (73) are provided between the opening force transmitting members (71) provided on the first and second arms (4, 5). ) Can be initially opened between the distal ends of the first and second arms (4, 5) using the so-called force increasing effect of the wedge. Moreover, the first opening member (72) and the second opening member (73) are operated by the automatic adjustment mechanism (74).
Since the amount of bite of the first support member (72) can be balanced, for example, by increasing the amount of bite of the first opening member (72), the first support base (1) and the second support base (2) It is possible to prevent such a problem that the parallelism cannot be maintained and the movement of the first and second support bases (1, 2) stops. In the invention according to claim 6,
For example, when the amount of bite of the first opening member (72) increases, the first and second members on one intermediate guide member (3) side.
The first and second support bases (1, 2) are opened by a link mechanism such as the first and second arms (4, 5). The first opening member (72) receives the reaction force to hold it in parallel.
Is slightly pushed out from between the opening force transmitting members (71). On the other hand, the second opening member (73)
Is connected to the first opening member (72) via the link (74d), the center link (74b), and the first link (74c).
2) is slightly pushed out, so that the first and second arms (4, 4) on one intermediate guide member (3) side.
5) It is slightly pushed between the opening force transmitting members (71). Also, when the biting amount of the second opening member (73) is larger, the first
The amount of biting between the opening member (72) and the second opening member (73) is balanced. In addition, the first and second
The opening force transmitting member (71) on the one side of the intermediate guide member (3) and the opening force transmitting member (71) on the other side of the intermediate guide member (3) are changed by the change of the bite amount of the opening members (72, 73). 71), the distance between the first and second release members (72, 73) is also the center link (74b), the first link (74c) and the second link (74d). ), The first and second opening members (7) between each opening force transmitting member (71).
2, 73) can always be balanced. Therefore, the first and second support bases (1, 2) can be smoothly moved in parallel. In the invention according to claim 7, since the guide bar (8) for linearly guiding the moving direction of the intermediate guide member (3) is provided, the moving direction of the intermediate guide member (3) is stabilized. Therefore, the rigidity of holding the first and second support bases (1, 2) in parallel via the intermediate guide member (3) and the first and second arms (4, 5) is improved. Become. Therefore, the parallel movement of the first and second support bases (1, 2) can be performed more smoothly.

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to FIGS. The lift L shown in this embodiment includes a first support base 1 and the first support base 1.
A second support base 2 disposed at a position entirely parallel to the support base 1, and an intermediate guide member 3 disposed between the first and second support bases 1, 2. Base end 4
a is rotatably connected to the intermediate guide member 3 via the pin Pn, and the distal end portion 4b is connected to the first support base 1 via the pin Pn.
The first arm 4 rotatably connected to the bracket portion 11 and the base end portion 5a are connected to the intermediate guide member 3 via a pin Pn.
The second arm 5 rotatably connected to the bracket portion 21 of the second support base 2 via the pin Pn, and the first and second support bases. 1,
When the two move away from each other, the first and second
Drive means 6 for linearly driving the intermediate guide member 3 in the direction in which the intermediate guide member 3 moves via the arms 4 and 5, and the tip portions 4b of the first and second arms 4 and 5 , 5
b approach each other and the driving force from the driving means 6
And in a state where it is impossible to move the second support bases 1 and 2 in a direction to separate them from each other,
Are initially moved in a direction to separate the first and second support bases 1 and 2 from each other only by the driving force of the driving means 6. And Hereinafter, the above configuration will be described in more detail. That is, two first arms 4 are arranged in parallel to one intermediate guide member 3, and the first support base 1 and the intermediate guide member 3 are separated from each other while keeping them parallel to each other. Making it accessible. Two second arms 5 are also arranged in parallel to one intermediate guide member 3, and the second support base 1 and the intermediate guide member 3 are separated from each other while being kept parallel to each other. Is possible. That is, the first and second arms 4, 5
The first and second support bases 1 and 2 are separated from each other while being kept parallel to each other by providing two in parallel at upper and lower positions of one intermediate guide member 3 respectively. Note that the term “up and down” indicates the up and down direction in a state where the first support base 1 is placed on, for example, a horizontal ground or a floor (not shown). Also, the first and second arms 4,
5 has the same distance between the pins Pn. The two intermediate guide members 3 are disposed at linear positions along the movement direction. That is, two intermediate guide members 3 are provided at positions separated in the left-right direction in FIGS. 1 and 2. Further, the intermediate guide member 3
As shown in FIG. 2, the first and second support bases 1 and 2 formed in the shape of a rectangular flat plate also have two positions in the front-rear direction.
Are arranged, and a total of four things are provided. The first and second arms 4 and 5 described above are connected to each intermediate guide member 3. In addition, one of the right intermediate guide members 3 is connected in the front-rear direction by a right connecting member 31, and the other left intermediate guide member 3 is connected in the front-rear direction by a left connecting member 32. Are linked by Further, the bracket portions 11 and 21 described above are arranged at four corners of the first and second support bases 1 and 2. The driving means 6 linearly moves and drives one of the right intermediate guide members 3 and 3 and the other left intermediate guide member 3 and 3 in a direction in which the intermediate guide members 3 and 3 are separated from each other. Connected first
The first and second support bases 1 and 2 are moved in parallel with each other via the second and fourth arms 4 and 5 in a direction in which the first and second support bases 1 and 2 are separated from each other. That is, the driving unit 6 is a motor unit (base) fixed to the center of the right connecting member 31 in the front-rear direction.
61, a lead screw 62 which is driven to rotate by the motor portion 61 and extends toward the left connecting member 32 which is the other intermediate guide member 3, and one and the other intermediate guide members by the lead screw 62. And an intermediate connecting member 63 that moves the space between 3, 3 in the expansion and contraction direction. Further, the driving means 6 is in a state in which the tip portions 4b and 5b of the first and second arms 4 and 5 are closest to each other (in this embodiment, a state where the first and second arms 4 and 5 are in parallel). ), The idle driving section d which does not exert a driving force on either side of the one and the other intermediate guide members 3, 3.
It is comprised so that it may have. That is, the lead screw 62 extends linearly through a through-hole provided in the center of the right connecting member 31 in the front-rear direction and a through-hole provided in the center of the left connecting member 32 in the front-rear direction. , Is screwed into a nut portion 63a of an intermediate connecting member 63 disposed between the right connecting member 31 and the left connecting member 32. For this reason, the lead screw 62 is
The intermediate connecting member 63 that has given a thrust through the left side connecting member 32 is pressed against one of the intermediate guiding members 3, 3
The distance between the first and second support bases 1 and 2 is increased by increasing the distance therebetween. The lead screw 62 further includes two guide pins 63b that slidably connect the intermediate connecting member 63 and the other intermediate guide member 3 at a predetermined interval (an interval equal to the idle driving section d).
By pulling the left connecting member 32 toward the right connecting member 31, the distance between the one and the other intermediate guide members 3, 3 is reduced, thereby narrowing the space between the first and second support bases 1, 2. ing. Then, in a state where the space between the first and second support bases 1 and 2 is the narrowest (a state where the first and second arms 4 and 5 are parallel), the intermediate connecting member 63.
The nut portion 63a is adapted to abut the left connecting member 32. For this reason, in order to push the intermediate guide members 3 again, it is necessary to move the intermediate connecting member 63 toward the other intermediate guide member 3 only in the idle drive section d. Also, the guide pin 63b is
It is necessary to obtain the idle drive section d and also to pull the left connecting member 32 toward the right connecting member 31 and to prevent the intermediate connecting member 63 from rotating together with the lead screw 62. ing. The initial opening means 7 is driven by the intermediate connecting member 63 to move the idle drive section d toward the other intermediate guide member 3, so that the first arm 4 and the second arm 5, whereby the space between the distal ends 4b, 5b of the first and second arms 4, 5 is initially widened. That is, the initial opening means 7 is provided at a predetermined position between the base ends 4a, 5a and the front ends 4b, 5b of the left and right first and second arms 4, 5 located near the center in the left-right direction. Roller (opening force transmitting member) 71
When the intermediate connecting member 63 moves in the idling drive section d toward the other intermediate guide member 3, the first opening member 72 that bites between the rollers 71 on the one intermediate guide member 3 and the other intermediate member. In order to maintain the parallel state of the second opening member 73 that bites between the rollers 71 on the guide member 3 side and the first and second support bases 1 and 2, the amount of biting of the first and second opening members 73. And an automatic adjustment mechanism 74 that balances the two. The roller 71 is formed by a ball bearing, and the outer ring of the ball bearing is a rolling wheel having high hardness and excellent durability. The automatic adjustment mechanism 74 includes a support member 74a fixed to each end of the intermediate connection member 63 in the front-rear direction, and a center in which an axial center portion is rotatably connected to the support member 74a via a pin Pn. A link 74b and a base end 74e are rotatably connected to one end of the center link 74b via a pin Pn, and a first link 74c having a first opening member 72 at a front end 74f; 74g is rotatably connected to the other end of the center link 74b via a pin Pn, and a second link 74d having a second opening member 73 is provided at a tip end 74h. In addition, the positions of the pins Pn of the base ends 74e and 74g of the first link 74c and the second link 74d shown in FIG. 2 are actually the positions indicated by the arrow A, but for the sake of clarity on the drawing. , A away from the position of the arrow A. Also, the first link 74c and the second link 74
d has the same shape and length, and the first opening member 72 and the second opening member 73 are also disk-shaped members having the same diameter. The first opening member 72 and the second opening member 73 both bite between the upper and lower rollers 71 from one side, in this embodiment, from the right side. Further, each opening member 72, 73
In the state where the space between the first and second support bases 1 and 2 is the narrowest (the state where the nut portion 63a of the intermediate connecting member 63 is in contact with the right connecting member 31), at least one of the rollers 71 (this embodiment) In the example, it is configured to contact the lower roller 71). In a state where the space between the first and second support bases 1 and 2 is opened as shown in FIG. 3, each of the opening members 72 and 73 is disengaged from the roller 71 and the first link 74 is opened.
c and the second link 74d will hang down,
This drooping is prevented, and the first and second support bases 1,
When each of the release members 72, 7
A stopper (not shown) for restricting the rotation range of each of the links 74c and 74d is provided so that the link 3 can be inserted. Further, in each of the one and the other intermediate guide members 3, 3,
A guide bar 8 for restricting the movement of these intermediate guide members 3 in a linear direction is inserted. The guide bar 8 has a rectangular cross section, and extends long over the range of movement of each intermediate guide member 3. This guide bar 8
Also, a stopper (not shown) prevents the intermediate guide member 3 from coming off. Further, a portion of the intermediate connecting member 63 corresponding to the guide bar 8 is hollow, so that the relative movement with the guide bar 8 can be freely performed. The pins Pn described above are all of the same standard, and the first and second arms 4 and 5 are also of the same shape and the same length. In the lift L configured as described above, when one and the other of the intermediate guide members 3 are linearly moved by using the driving means 6, the first and second arms 4, 5 move
It turns around the base ends 4a and 5a on the side. At this time, when the first and second arms 4 and 5 stand vertically with respect to the intermediate guide member 3, as shown in FIG. 3, the distance between the first and second support bases 1 and 2 is increased. Is most open. That is, the height from the first support base 1 to the second support base 2 on the horizontal ground becomes maximum.
On the other hand, when the first and second arms 4 and 5 rotate so as to be parallel to each other, and the nut portion 63a abuts on the right-side connecting member 31, the first and second support bases 1 and 2 Is the narrowest. That is, the second support base 2 is at the lowest position. If the movement of the nut portion 63a is enabled until the tip portions 4b and 5b of the first and second arms 4 and 5 come into contact with each other, the distance between the first and second support bases 1 and 2 is further increased. Can be narrow. Therefore, the second arm is moved to the height position where the length of the first and second arms 4, 5 is maximized.
Can be moved, and the first and second arms 4 and 5 can be moved from the parallel state to a lower position where the tips 4b and 5b come into contact with each other. Can be moved. Therefore, the conventional X
As compared with the lift using the link, the maximum height at which the second support base 2 can be moved can be increased, and the minimum height of the second support base 2 can be reduced. it can. That is, it is possible to obtain an unprecedented large fluctuation stroke. Also, the first and second arms 4, 5
When the distance between the distal end portions 4b and 5b becomes equal to the distance between the proximal end portions 4a and 5a, ie, the first and second arms 4,
When the first and second intermediate guide members 3 are theoretically opened, the first and second intermediate guide members 3 can be opened.
Arm 4, 5 does not swing, and it becomes impossible to increase the distance between the first support base 1 and the second support base 2.
When the distance between the distal ends 4b and 5b is smaller than the distance between the proximal ends 4a and 5a and the first and second arms 4 and 5 are tilted in the opposite direction to the opening direction, that is, when the first and second arms 4 and 5 are tilted reversely. Also the first
It is impossible to increase the distance between the support base 1 and the second support base 2. However, since the initial opening means 7 is provided, the distal ends 4b and 5b of the first and second arms 4 and 5 are separated from each other even in the parallel state or the reversely inclined state as described above. Which can be moved,
The distal ends 4b, 5b can be spaced apart from the base ends 4a, 5a. That is, after the end portions 4b and 5b of the first and second arms 4 and 5 are separated from each other by a predetermined amount by the initial opening means 7, the driving force of the driving means 6 is directly applied to the intermediate guide member 3 to perform the second operation. The first and second support bases 1 and 2 can be moved in a direction away from each other or in a direction approaching each other. Further, since two first arms 4 and two second arms 5 are provided for one intermediate guide member 3, the three members of the first support base 1, the intermediate guide member 3 and the second support base 2 are provided. Can be moved in the direction in which they are separated from each other while maintaining the parallelism. Therefore, the second support base 2 can be stably moved in the vertical direction while maintaining the horizontal state with respect to the first support base 1 installed on the horizontal ground. In addition, the first and second support bases 1 and 2 are kept parallel to one intermediate guide member 3, and the first and second support bases are also set to the other intermediate guide member 3. Since the first and second intermediate guide members 3 and 3 are moved in the direction in which the first and second intermediate guide members 3 are separated from each other by the driving means 6, the first and second intermediate guide members 3 and 3 are eventually moved.
The supporting bases 1 and 2 can be surely moved in parallel. Furthermore, even if the first and second arms 4 and 5 swing,
Since the position for supporting the first and second support bases 1 and 2, that is, the position of the bracket portions 11 and 21 does not change, when the luggage or the like placed on the second support base 2 is at any height, Can be stably maintained. On the other hand, in the conventional link in which the links are arranged in an X-shape, as the height increases, the distance between the lower and upper fulcrums narrows and becomes extremely unstable. Also, the first and second arms 4,
In the state in which the tip portions 4b, 5b of 5 are closest to each other,
Since the idle driving section d in which no force is applied from the driving means 6 to the intermediate guide member 3 is provided, the intermediate connecting member 63 can be freely idled in the range of the idle driving section d. Then, the intermediate connecting member 6 during the idle movement
The initial opening means 7 is actuated using the driving force of the first and second arms 4 and 5, whereby the distal ends 4 b and 5 of the first and second arms 4 and 5 are operated.
Since b is initially widened, it is not necessary to separately provide another drive source for driving the initial opening means 7. Therefore, the structure can be simplified and the cost can be reduced. Furthermore, by making the first opening member 72 and the second opening member 73 bite between the rollers 71 provided on the first and second arms 4 and 5, the so-called wedge-based force increasing effect is used. The space between the distal ends 4b, 5b of the first and second arms 4, 5 can be initially opened. Therefore, even if the second support base 2 is at the lowest position, it is possible to lift a load or the like on the second support base 2 with a larger force. In addition, the amount of bite between the first opening member 72 and the second opening member 73 can be balanced by the automatic adjustment mechanism 74, and therefore, as shown in FIGS. With respect to the arms 4 and 5 of the second arm, for example,
Can be swung from 0 ° (parallel state) to 17.5 ° (substantially equal to the maximum tilt angle that can be tilted by the initial opening means 7). In addition, the first and second
When the angle of inclination of the arms 4 and 5 reaches approximately 17.5 °, the intermediate connecting member 63 comes into contact with the left connecting member 32, and thereafter, the thrust of the nut portion 63a causes the force of FIG.
As shown at 0, the inclination angles of the first and second arms 4, 5 increase. The automatic adjusting mechanism 74 will be further described. For example, when the biting amount of the first opening member 72 becomes larger than the biting amount of the second opening member 73, the first and second support bases on one intermediate guide member 3 side. The portion between the first and second support bases 1 and 2 is greatly opened so that the parallelism between the first and second support bases 1 and 2 is lost. This happens when,
The first and second arms 4, 5, etc. provide a first link mechanism.
And the force for returning the second support bases 1 and 2 to the parallel state increases, so that the first opening member 72 receives a larger force in the direction of being pushed out from each roller 71, and It is slightly extruded from between 71. On the other hand, the second opening member 73 is connected to the second link 74.
d, since the first opening member 72 is connected to the first opening member 72 via the center link 74b and the first link 74c, the first opening member 72 is slightly pushed out, so that there is a slight gap between the rollers 71. Will be pushed into. And
If the second opening member 73 is pushed too far, the second opening member 73 is pushed out and the first opening member 72 is pushed in, contrary to the above. In addition, the first and second
, The gap between the opening force transmitting member 71 on one intermediate guide member 3 side and the opening force transmitting member 71 on the other intermediate guide member 3 side also changes. That is, since the distance between the first and second release members 72 and 73 also changes depending on the central link 74b, the first link 74c, and the second link 74d, each release force transmission member 71 is provided. It is possible to always balance the amount of the first and second opening members 72, 73 that bite into the gap. Therefore, the first and second arms 4,
The first and second support bases 1 and 2 can move smoothly while maintaining the first and second support bases 1 and 2 in parallel without causing excessive force to the 5th and the like. However, in the case where a member that holds the first opening member 72 and the second opening member 73 at a fixed interval (for example, 180 mm) is provided at the end of the intermediate connecting member 63 without providing the automatic adjustment mechanism 74. 11 and 12, as the intermediate connecting member 63 moves, the biting amount of the first opening member 72 becomes larger than the biting amount of the second opening member 73. Therefore, FIG.
As shown in (1), the space on the right side between the first and second support bases 1 and 2 is increased. However, since the first and second arms 4 and 5 and the intermediate guide member 3 and the like strongly exert a force for keeping the first and second support bases 1 and 2 in parallel,
The parallelism of the first and second support bases 1 and 2 cannot be broken, so that the first opening member 72 cannot bite, and the movement of the intermediate connecting member 63 stops, whereby the first And the movement of the second support bases 1 and 2 will be stopped. Further, since the guide bar 8 that guides the moving direction of the intermediate guide members 3 and 3 in a straight line is provided, the movement of the intermediate guide members 3 and 3 in the left and right direction can be stabilized. Therefore, as shown in FIG. 14, the rigidity for holding the intermediate guide members 3, 3 in a certain direction is improved, and the first and second support bases 1, 2 are provided via the first and second arms 4, 5. Since the rigidity for holding the members 2 in parallel is improved, the first and second support bases 1 and 2 can be moved more smoothly. As shown in FIG. 15, the first and second arms 4 and 5 may be configured such that one arm is provided for each of the intermediate guide members 3 and 3. However, in this case, since the first and second support bases 1 and 2 cannot be kept parallel by the first and second arms 4 and 5, the one and the other intermediate guide members 3 are provided by the guide bar 8. Keep 3 in a straight line,
This makes it necessary to keep the first and second support bases 1, 2 parallel.

According to the first aspect of the present invention, when the intermediate guide member (3) is moved and driven using the driving means (6), the first and second arms (4, 5) are moved. It turns around the base end (4a, 5a) on the 3) side as a fulcrum. At this time, the first and second support bases (1,
The interval between 2) becomes the most open state when the first and second arms (4, 5) are in a state of standing perpendicular to the intermediate guide member (3). That is, when the first support base (1) is placed on, for example, horizontal ground, the second support base (2) is at the highest position. The distance between the first and second support bases (1, 2) is determined when the first and second arms (4, 5) are rotated so as to be parallel to each other or further rotated. First and second arms (4,
When the tip portions (4b, 5b) of 5) can contact each other, the narrowest state is established at that time. That is, the second
Is the lowest position. Therefore, the first
And the second support base (2) can be moved to a height position that makes full use of the length of the second arm (4, 5), and the first and second arms (4, 5) can be moved. Can move the second support base (2) from the parallel state to a lower position where the tip portions abut each other. Therefore, compared to the conventional lift in which the links are arranged in an X-shape, the minimum ground clearance of the second support base (2) is reduced and the maximum ground clearance of the second support base (2) is increased. Can be. That is, a large fluctuation stroke can be obtained. Also, when the distance between the distal ends (4b, 5b) of the first and second arms (4, 5) becomes equal to the distance between the proximal ends (4a, 5a), that is, the first and second arms When the arms (4, 5) are parallel, or when the tips (4b,
When the distance between 5b) is smaller than the distance between the base ends (4a, 5a), that is, when the first and second arms (4, 5) are tilted in opposite directions, the intermediate guide is theoretically possible. Even if the driving force of the driving means (6) is directly applied to the member (3) side, the first support base (1) and the second support base are provided via the first and second arms (4, 5). It is impossible to increase the interval with (2). However, since the initial opening means (7) is provided, even if it is in a parallel state or an inverted state,
The tips (4b, 5) of the first and second arms (4, 5)
b) can be pivoted away from each other, and the distance between the distal ends (4b, 5b) is adjusted to the proximal end (4a, 5a).
It can be wider than the distance between them. That is, after the initial opening means (7) has moved the distal ends (4b, 5b) of the first and second arms (4, 5) away from each other, the intermediate guide member (3) is driven by the driving means (6). ), The first and second support bases (1, 2) can be moved in a direction away from each other. According to the second aspect of the present invention, by providing at least two first arms (4) and two second arms (5), the first support base (1), the intermediate guide member (3) and The three members of the second support base (2) can move in the direction of coming and going while keeping parallel. Therefore, for example, when the first support base (1) is placed on horizontal ground,
The second support base (2) can be moved up and down stably while maintaining the horizontal state. According to the third aspect of the invention, the first and second support bases (1, 2) are kept parallel to one intermediate guide member (3), and the other intermediate guide member (3 ), The first and second support bases (1, 2) are kept parallel, so that
The first and second support bases (1, 2) are moved in parallel in the direction in which the first and second support bases (1, 2) are moved only by moving the one and the other intermediate guide members (3, 3) in the direction in which the first and second support bases (1, 2) are moved in a direction in which the first and second support bases are separated. can do. Moreover, one intermediate guide member (3)
Position where the first and second support bases (1, 2) are supported by the first and second arms (4, 5) on the side, and the first and second sides on the other intermediate guide member (3) side. Arm (4, 5)
Since the position for supporting the first and second support bases (1, 2) does not change, it is possible to always stably support, for example, luggage or the like placed on the second support base (2). it can. On the other hand, in the conventional link in which the links are arranged in an X-shape, as the height increases, the distance between the lower and upper fulcrums narrows and becomes extremely unstable. According to the fourth aspect of the present invention, the state in which the distal ends of the first and second arms (4, 5) are closest to each other (that is, the driving force of the driving means (6) is moved toward the intermediate guide member (3)). In a state where it is impossible to move the first and second support bases (1, 2) in a direction in which the first and second support bases (1, 2) are separated even if they are directly actuated), the one and the other intermediate guide members (3) from the driving means (6). The drive means (6) can be driven freely within the range of the idle drive section (d) since the idle drive section (d) does not exert a driving force on either side of the drive means. Will be. Then, the initial opening means (7) uses the driving force of the driving means (6) which can be freely driven in the idle driving section (d) to initialize the distal ends of the first and second arms (4, 5). It is not necessary to newly provide another drive source for driving the initial opening means (7). Therefore, the structure can be simplified and the cost can be reduced. In the invention described in claim 5, the first opening member (72) and the second opening member (73) are provided between the opening force transmitting members (71) provided on the first and second arms (4, 5). ) Can be initially opened between the distal ends of the first and second arms (4, 5) using the so-called force increasing effect of the wedge. Moreover, the first opening member (72) and the second opening member (73) are operated by the automatic adjustment mechanism (74).
Since the amount of bite of the first support member (72) can be balanced, for example, by increasing the amount of bite of the first opening member (72), the first support base (1) and the second support base (2) It is possible to prevent such a problem that the parallelism cannot be maintained and the movement of the first and second support bases (1, 2) stops. In the invention according to claim 6,
For example, when the amount of bite of the first opening member (72) increases, the first and second members on one intermediate guide member (3) side.
The first and second support bases (1, 2) are opened by a link mechanism such as the first and second arms (4, 5). The first opening member (72) receives the reaction force to hold it in parallel.
Is slightly pushed out from between the opening force transmitting members (71). On the other hand, the second opening member (73)
Is connected to the first opening member (72) via the link (74d), the center link (74b), and the first link (74c).
2) is slightly pushed out, so that the first and second arms (4, 4) on one intermediate guide member (3) side.
5) It is slightly pushed between the opening force transmitting members (71). Also, when the biting amount of the second opening member (73) is larger, the first
The amount of biting between the opening member (72) and the second opening member (73) is balanced. In addition, the first and second
The opening force transmitting member (71) on the one side of the intermediate guide member (3) and the opening force transmitting member (71) on the other side of the intermediate guide member (3) are changed by the change of the bite amount of the opening members (72, 73). 71), the distance between the first and second release members (72, 73) is also the center link (74b), the first link (74c) and the second link (74d). ), The first and second opening members (7) between each opening force transmitting member (71).
2, 73) can always be balanced. Therefore, the first and second support bases (1, 2) can be smoothly moved in parallel. In the invention according to claim 7, since the guide bar (8) for linearly guiding the moving direction of the intermediate guide member (3) is provided, the moving direction of the intermediate guide member (3) is stabilized. Therefore, the rigidity of holding the first and second support bases (1, 2) in parallel via the intermediate guide member (3) and the first and second arms (4, 5) is improved. Become. Therefore, the parallel movement of the first and second support bases (1, 2) can be performed more smoothly.

[Brief description of the drawings]

FIG. 1 is a view of a lift shown as one embodiment of the present invention, and is a front view showing a state where the lift is set at a minimum height.

FIG. 2 is a view showing the lift, and is a II-II of FIG.
It is sectional drawing which follows a line.

FIG. 3 is a view showing the same lift, and is a front view showing a state where the lift is set to a maximum height.

FIG. 4 is a view showing the lift, and is a view taken along a line IV-IV in FIG. 3;
It is principal part sectional drawing along a line.

FIG. 5 is a view showing the operation of the lift, and is a front view when the inclination angles of the first and second arms are 0 °.

FIG. 6 is a view showing the operation of the lift, and is a front view when the inclination angle of the first and second arms is 5 °.

FIG. 7 is a front view of the operation of the lift when the inclination angles of the first and second arms are 10 °.

FIG. 8 is a view showing the operation of the lift, and is a front view when the inclination angle of the first and second arms is 15 °.

FIG. 9 is a front view of the operation of the lift when the inclination angles of the first and second arms are 17.5 °.

FIG. 10 is a front view showing the operation of the lift when the inclination angle of the first and second arms is 30 °.

FIG. 11 is a view showing a comparative example in which the distance between the first and second opening members is fixed in the lift, wherein the inclination angle of the first and second arms is 10 °. It is a front view at the time.

FIG. 12 is a view showing a comparative example in which the distance between the first and second opening members is fixed in the lift, wherein the inclination angle of the first and second arms is 17.5. It is a front view at the time of °.

FIG. 13 is a view showing a comparative example in which the distance between the first and second opening members is fixed in the lift, in a state where the first and second support bases are out of parallel; FIG.

FIG. 14 is a view showing the same lift, and is a conceptual view showing a state in which first and second support bases are held in a normal parallel state.

FIG. 15 is a conceptual diagram showing another example of the lift.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st support base 2 2nd support base 3 Intermediate guide member 4 1st arm 4a base end 4b tip 5 second arm 5a base end 5b tip 6 drive means 7 initial opening means 71 roller ( (Opening force transmitting member) 72 First opening member 73 Second opening member 74 Automatic adjustment mechanism 74a Support member 74b Central link 74c First link 74d Second link 74e Base end 74f Tip 74g Base end 74h Tip Part 8 Guide bar d Empty drive section

Claims (7)

[Claims] 1. A first support base (1), a second support base (2) arranged at a position overlapping the first support base (1), and a first and a second support An intermediate guide member (3) disposed between the bases (1, 2); a base end (4a) rotatably connected to the intermediate guide member (3); and a distal end (4b) connected to the intermediate guide member (3). First support base (1)
A first arm (4) rotatably connected to the first arm (4), a base end (5a) rotatably connected to the intermediate guide member (3), and a distal end (5b) connected to the second support. Base (2)
A second arm (5) rotatably connected to the first and second support bases (1, 2) when the first and second support bases (1, 2) move away from each other; A driving means (6) for driving the intermediate guide member (3) to move in a direction in which the intermediate guide member (3) moves via (4, 5); and the first and second arms (4, 5). 5) Each tip (4
b, 5b) approach each other and cannot move the first and second support bases (1, 2) away from each other only by the driving force from the driving means (6). By initially moving the tip portions (4b, 5b) in the direction away from each other, it is possible to move the first and second support bases (1, 2) in the direction away from each other only by the driving force. A lift characterized by comprising an initial opening means (7). 2. By arranging at least two first arms (4) parallel to the intermediate guide member (3), the first support base (1) and the intermediate guide member (3) can be moved together. The second support base (2) and the intermediate guide member (2) are configured to move in parallel, and by arranging at least two second arms (5) in parallel with the intermediate guide member (3). 3) The first and second support bases (1, 2) are configured to move while being parallel to each other by being configured to move parallel to each other. Lift. 3. Two intermediate guide members (3) are arranged along the moving direction of the intermediate guide member (3), and the driving means (6) is provided with one and the other intermediate guide members (3, 3).
By driving 3) to move in the direction in which they are separated from each other,
The first and second support bases (1, 2) are moved in directions away from each other via first and second arms (4, 5) connected to the respective intermediate guide members (3). The lift according to claim 2, wherein the lift is provided. 4. The driving means (6) includes a first and second intermediate guide member (3) in a state in which the tip portions (4b, 5b) of the first and second arms (4, 5) are closest to each other. Is configured so as to have an idle driving section (d) that does not exert a driving force on either side of the driving means (7), and the initial opening means (7) is provided with the driving means (6) in the idle driving section (d). The first arm (4) and the second arm of each of the one and other intermediate guide members (3, 3) move from one intermediate guide member (3) side to the other intermediate guide member (3) side by a driving force. The first and second arms (4, 5) are configured to be initially widened by widening the space between the first and second arms (5, 5). The lift according to claim 3. 5. The initial opening means (7) is provided at a predetermined position between a base end (4a, 5a) and a front end (4b, 5b) of each of the first and second arms (4, 5). The opening force transmission member (71) provided on the intermediate guide member (3) side is driven to move by the driving force of the driving means (6) in the idle drive section (d) and the opening force transmission member (71) provided in the idle driving section (d). The second opening biting between the first opening member (72) and the opening force transmitting member (71) on the other intermediate guide member (3) side.
And the first and second support bases (1,
An automatic adjusting mechanism (74) for balancing the amount of biting of each of the first and second opening members (72, 73) to maintain the parallel state of (2). The lift mentioned. 6. An automatic adjusting mechanism (74) comprising: a support member (74a) which is moved and driven by a driving force of a drive means (6) in an idle drive section (d);
a) a central link (74) in which the intermediate portion is rotatably connected to
b) and a first link (74c) rotatably connecting the base end (74e) to one end of the center link (74b) and having a first opening member (72) at the front end (74f). And the base end (74g) is rotatably connected to the other end of the center link (74b), and the second opening member (7) is connected to the front end (74h).
6. A lift according to claim 5, comprising a second link (74d) having 3). 7. A guide bar (8) for guiding an intermediate guide member (3) in a straight line.
The lift according to 2, 3, 4, 5 or 6.