JP2013220776A - Lifting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a platform from being erroneously operated in a horizontal open state when a lifting link mechanism is installed in a cabin, the lifting platform driven to be lifted and lowered by the lifting link mechanism is freely storable in a standing state and the platform can be horizontally opened.SOLUTION: A lifting device includes: a pair of stay arms 5 lifted and lowered by a parallel link; a support shaft 6 fixed to one of the stay arms; a support detachably provided in the other, a pivotal shaft for connecting the support shaft 6 and the support; a lifting platform 10 mounted in the pivotal shaft to be freely derricked; and stay arm lock mechanisms 20 for preventing lowering of the stay arms 5 in the standing state. In the standing state of the platform 10, a lock member 30 of the stay arm lock mechanism 20 is locked by a lock pin 40.

Description

  The present invention relates to an elevating device in which an elevating link mechanism is installed in a passenger compartment, and an elevating platform that is driven up and down by the elevating link mechanism can be retracted in an upright state.

  2. Description of the Related Art Conventionally, there has been known an elevating device in which an elevating link mechanism is installed in a vehicle interior, and an elevating platform driven up and down by the elevating link mechanism can be stowed upright. In this type of lifting device, the platform is moved horizontally from an upright state during cargo handling, and then the platform is driven up and down by a lifting link mechanism. Furthermore, depending on the user layer, there is a case where a light load is handled, and it takes time to use a lifting device for loading or unloading. Therefore, a structure that can open a platform in an upright state has been proposed (Patent Document 1 below).

  If the lifting link mechanism is accidentally operated when the platform is laterally open (when the platform is facing the front and rear of the vehicle compartment), the platform will be lowered without being able to handle the cargo. Need to prevent.

JP 2010-269744 A

  The present invention has been made in view of such a situation, and an object of the present invention is to provide an elevating device capable of retracting an elevating platform which is driven up and down by installing an elevating link mechanism in a vehicle interior in a standing state, and An object of the present invention is to provide an elevating device that prevents the platform from being erroneously operated by an elevating link mechanism in a horizontally opened state when the platform can be opened sideways, thereby improving operability.

An aspect of the present invention is a lifting device, a main body frame fixed to a vehicle body floor,
A first and a second arm, each of which is provided with a substantially parallel link having one end pivotally attached to the main body frame and the other end pivotally attached to a stay arm;
A support shaft attached to one stay arm in the vertical direction and held rotatably;
A support column that is detachably attached to the other stay arm and provided in the vertical direction,
A pivot connecting the support shaft and the support shaft;
An elevating platform that is pivotably attached between the support shaft and the support shaft at the pivot;
A cylinder for rotating the first or second arm to drive the lifting platform;
A stay arm lock mechanism for preventing the stay arm from being lowered in the standing state of the elevating platform;
The stay arm locking mechanism is
A cam provided on the lifting platform;
A slide member provided on the stay arm and in contact with the cam;
A lock member attached to the stay arm and actuated by the slide member;
A locking member that is provided on the main body frame side and locks the locking member;
In the standing state of the lifting platform, the lock member is locked by the locking member.

  In the above aspect, the plunger is provided on the support shaft so that the front end protrudes from the outer periphery of the support shaft, and the front end of the plunger is engaged when the lifting platform is laterally opened around the support shaft. It is preferable that the concave portion to be combined is arranged on the stay arm side.

  The said aspect WHEREIN: It is good for the said cylinder to be a single acting hydraulic cylinder, and to incorporate the spring which urges | biases in the direction which lowers the said raising / lowering platform.

  It should be noted that any combination of the above-described constituent elements, and those obtained by converting the expression of the present invention between methods and systems are also effective as aspects of the present invention.

  According to the present invention, when an elevating link mechanism is installed in a vehicle interior so that the elevating platform driven to be elevated can be stowed upright and the elevating platform can be opened sideways, the elevating platform is opened sideways. Can be prevented from being erroneously operated by the elevating link mechanism, and as a result, operability can be improved.

It is a right view of embodiment of the raising / lowering apparatus which concerns on this invention. It is embodiment and it is the front view seen from the vehicle rear part. It is a top view of an embodiment. It is the left side view. It is a sectional side view of the stay arm locking mechanism in an embodiment. It is a plane sectional view of the mechanism part which holds a platform in a state of opening horizontally in an embodiment.

  Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings. In addition, the same code | symbol is attached | subjected to the same or equivalent component, member, process, etc. which are shown by each drawing, and the overlapping description is abbreviate | omitted suitably. In addition, the embodiments do not limit the invention but are exemplifications, and all features and combinations thereof described in the embodiments are not necessarily essential to the invention.

  FIG. 1 to FIG. 4 are embodiments of the present invention and show the overall configuration of the lifting device. 1 to 4, reference numeral 1 denotes a van-type vehicle (box-type vehicle). A pair of main body frames 2 are separated from each other on the rear floor surface 1 a near the rear opening of the vehicle body of the van-type vehicle. The vertical and horizontal directions are defined in FIG. A main arm 3 and a sub arm 4 constituting a substantially parallel link forming a lifting link mechanism are pivotally attached (rotatably attached) to the main body frame 2. That is, one end of the main arm 3 is pivotally attached to the main body frame 2 by the pin 3a, and one end of the sub arm 4 is pivotally attached by the pin 4a. A stay arm 5 is pivotally attached to the other end of the main arm 3 and the sub arm 4 by pins 3b and 4b.

  The stay arm 5 has a vertical extension portion 5a below the pivot point of the main arm 3 and the sub arm 4, and a support shaft 6 is provided in front of the vertical extension portion 5a of one stay arm 5 (right side in this example). Are attached in the vertical direction and are rotatably held. On the front surface of the vertical extension 5a of the other stay arm 5 (left side in this example), a support column 7 is detachably provided in a vertical direction by a lock mechanism (details omitted). And the pivot 8 which holds the raising / lowering platform 10 is attached and fixed so that the lower end part of the support | pillar axis | shaft 6 and the lower end part of the support | pillar 7 may be connected.

  The elevating platform 10 has a main plate 11 and a tip side plate 12 on the tip side thereof connected to each other so as to be foldable by an intermediate hinge 13. The main plate 11 is rotatably supported by a pivot 8, and Two series-connected links 14 and 15 that connect between the plate 11 and the support shaft 6 and the support 7 are respectively held in a horizontal state when deployed. Accordingly, the platform 10 can be stored in the van type vehicle 1 by turning the front end side plate 12 upside down and overlapping the main plate 11 and further erecting the main plate 11 (standing substantially vertically). The unfolding operation is performed by leveling the main plate 11 and then opening and unfolding the tip end side plate 12 in an inverted state toward the tip end side of the main plate 11.

  A single acting hydraulic cylinder 9 is connected between the pin 3b (the pivot point of the main arm 3 and the stay arm 5) and the pin 4a (the pivot point of the main body frame 2 and the sub arm 4) to drive the lifting platform 10 up and down. ing. However, the single-acting hydraulic cylinder 9 has a built-in compression spring 9a that urges the piston rod in the contracting direction. Accordingly, when the hydraulic oil in the single-acting hydraulic cylinder 9 can be discharged, the single-acting hydraulic cylinder 9 is contracted by the built-in compression spring 9a, and the main arm 3 and the sub arm 4 are counterclockwise in FIG. The platform 10 can be lowered and landed. Conversely, if hydraulic oil is supplied into the single-acting hydraulic cylinder 9, the single-acting hydraulic cylinder 9 extends to rotate the main arm 3 and the sub arm 4 clockwise, and the platform 10 is raised to the height of the rear floor 1a. Drive up to.

  Depending on the user layer, there is a case where a light load is handled, and it takes time to use a lifting device for loading or unloading, and therefore, cargo handling may be performed without using the lifting device. For this purpose, the support column 7 is detached from the stay arm 5 and the platform 10 is opened sideways with the support shaft 6 as the rotation center as shown by the phantom line in FIG. 4 (the platform is directed in the front-rear direction of the passenger compartment). can do. If the main arm 3 and the sub-arm 4 are erroneously operated in this state, the platform 10 is lowered in a state where cargo handling cannot be performed. Therefore, it is necessary to prevent such a malfunction.

  Therefore, the stay arm locking mechanism 20 shown in FIG. 5 is added between the lower portions of both the left and right stay arms 5 and the main body frame 2. The stay arm lock mechanism 20 includes a plate cam 21 provided on a side surface of the elevating platform 10 (main plate 11), a slide member 25 that contacts the plate cam 21, and a lock member 30 attached to the stay arm 5 with a pin 31. And a locking pin 40 as a locking member provided on the main body frame 2 side.

  The plate cam 21 provided on the side surface of the elevating platform 10 includes a flat cam surface 21a that comes into contact with the slide member 25 when the platform 10 stands up, and a curved surface that comes into contact with the slide member 25 when the platform 10 is unfolded. (Arc-shaped or elliptical arc-shaped) cam surface 21b.

  The slide member 25 is slidable on a square pipe-shaped connecting member 43 that connects the lower portions of the pair of left and right stay arms 5, and is slid laterally by a roller 46 pivotally attached to the stay arm 5. Guided and the slide range is restricted. The slide member 25 includes an abutment portion 26 with which the plate cam 21 abuts, an operating portion 27 that rotates the lock member 30, a slide portion 28 that slides in contact with the upper surface of the connecting member 43, and a spring attachment portion 29. Is formed.

  The lock member 30 is operated by having one end (lower end) 30a in contact with the operating portion 27 of the slide member 25, and the other end is a hook 30b. An extension spring 35 is attached between the spring mounting portion 29 of the slide member 25 and the lock member 30 to urge the hook 30b in a direction to engage the locking pin 40 on the main body frame 2 side. The locking pin 40 is fixed to an extension 45 fixed to the main body frame 2.

  In the standing state of the lifting platform 10, the cam surface 21 a having a small distance from the center of the pivot 8 serving as the rotation fulcrum of the platform 10 comes into contact with the contact portion 26 of the slide member 25 (the lock member is caused by the elastic force of the extension spring 35). As a result, the hook 30b is lowered and engaged with the locking pin 40 (the locking member 30 is locked by the locking pin 40). Accordingly, even if the hydraulic oil in the hydraulic cylinder 9 is accidentally discharged and the main arm 3 and the sub arm 4 are lowered, the stay arm 5 is locked and the lowering is prevented, so that the platform 10 cannot be handled. It is possible to prevent the situation of falling in the state.

  In a state where the lifting platform 10 is deployed horizontally, the cam surface 21b having a large distance from the center of the pivot 8 serving as a rotation fulcrum of the platform 10 comes into contact with the contact portion 26 of the slide member 25 as shown in phantom lines in FIG. (The one end 30a of the lock member 30 is moved to the right by the slide member 25 against the elastic force of the extension spring 35). As a result, the hook 30b is raised (rotates counterclockwise) and the locking pin 40 is disengaged. Thus, the main arm 3 and the sub arm 4 are lowered so that the hydraulic oil in the hydraulic cylinder 9 can be discharged (initially due to the elastic force of the compression spring 9a, and thereafter due to the weight of each arm, platform, etc.). The arm 5 and the platform 10 can be lowered to the landing state.

  By supplying hydraulic oil to the hydraulic cylinder 9 from the lowered state of the lifting platform 10, the main arm 3 and the sub arm 4 are raised, and the stay arm 5 and the platform 10 can be driven up to the height of the rear floor 1a. Furthermore, the platform 10 can be folded into two and folded to stand up and stored in the vehicle body.

  As shown by the phantom line in FIG. 4, the standing platform 10 folded in two can be set in a laterally open state (a state where the platform faces the front-rear direction of the passenger compartment) with the support shaft 6 as a rotation center. In order to maintain the laterally open state, the mechanism shown in FIG. In FIG. 6, a plunger 50 includes a compression spring 52 and a projecting member 53 urged in the projecting direction in the casing 51, and a distal end portion of the projecting member 53 projects from the casing 51. And most of the plunger 50 is fixed to the support shaft 6 in an embedded state so that the tip of the protruding member 53 protrudes from the outer periphery of the support shaft 6. On the other hand, a positioning member 55 having a recess 56 into which the tip of the protruding member 53 of the plunger 50 is fitted when the platform 10 is in a laterally open state about the support shaft 6 is fixed to the stay arm 5 side. . As a result, when the platform 10 is in the laterally open state, the distal end portion of the protruding member 53 of the plunger 50 can be fitted (engaged) with the recess 56, and the laterally open state can be maintained. It should be noted that the platform 10 can be returned to the state shown in FIG. 2 by applying an operating force that overcomes the elastic force of the compression spring 52 built in the plunger 50. In the state of FIG. 2, it is possible to attach the support column 7 to the stay arm 5 and integrate it so that the platform 10 can be deployed horizontally.

  According to the present embodiment, the following effects can be achieved.

(1) In the case where an elevating link mechanism (main arm 3 and sub arm 4) is installed in the passenger compartment so that the elevating platform 10 driven up and down can be stowed upright and the platform 10 can be opened sideways. It is possible to prevent the platform 10 from being erroneously operated by the lifting / lowering link mechanism in the side-opened state, thereby improving the operability.

(2) The stay arm lock mechanism 20 is composed of a cam and a lever mechanism, does not use an electrical sensor and a switch, and is simple and inexpensive.

(3) When the plunger 50 is fixed to the column shaft 6 so that the tip portion protrudes from the outer periphery of the column shaft 6, the tip portion of the plunger 50 moves when the lifting platform 10 is in a laterally open state around the column shaft 6. Since the engaging concave portion 56 is disposed on the stay arm 5 side, the platform 10 in the standing state can be held in the laterally open state with a simple configuration.

  The present invention has been described above by taking the embodiment as an example. However, it is understood by those skilled in the art that various modifications can be made to each component and each processing process of the embodiment within the scope of the claims. By the way. Hereinafter, modifications will be described.

  In the embodiment, the hydraulic cylinder is provided between the two pins on the diagonal line among the pins located at the apex of the parallelogram of the lifting link mechanism, but it is clear that the arrangement of the hydraulic cylinder is not limited to this. The main arm may be rotated.

DESCRIPTION OF SYMBOLS 1 Van type car 1a Floor surface 2 Main body frame 3 Main arm 4 Sub arm 5 Stay arm 6 Strut shaft 7 Strut 8 Axis 9 Single acting hydraulic cylinder 10 Platform 11 Main plate 12 Tip side plate 20 Stay arm lock mechanism 21 Plate cam 25 Slide member 30 Locking member 35 Extension panel 40 Locking pin
45 Extension part 46 Roller 50 Plunger 51 Casing 52 Compression spring 53 Projection member 55 Positioning member 56 Recessed part

Claims (3)

A body frame fixed to the body floor,
A first and a second arm, each of which is provided with a substantially parallel link having one end pivotally attached to the main body frame and the other end pivotally attached to a stay arm;
A support shaft attached to one stay arm in the vertical direction and held rotatably;
A support column that is detachably attached to the other stay arm and provided in the vertical direction,
A pivot connecting the support shaft and the support shaft;
An elevating platform that is pivotably attached between the support shaft and the support shaft at the pivot;
A cylinder for rotating the first or second arm to drive the lifting platform;
A stay arm lock mechanism for preventing the stay arm from being lowered in the standing state of the elevating platform;
The stay arm locking mechanism is
A cam provided on the lifting platform;
A slide member provided on the stay arm and in contact with the cam;
A lock member attached to the stay arm and actuated by the slide member;
A locking member that is provided on the main body frame side and locks the locking member;
In the standing state of the lifting platform, the lifting member is locked by the locking member.   A plunger is provided on the support shaft so that the front end protrudes from the outer periphery of the support shaft, and a recess is formed in which the front end of the plunger engages when the lifting platform is laterally opened around the support shaft. The lifting device according to claim 1, which is disposed on the stay arm side.   The elevating device according to claim 1 or 2, wherein the cylinder is a single-acting hydraulic cylinder and has a built-in spring that biases the elevating platform in a downward direction.

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