JP3092748U - Underfloor retractable lifting device - Google Patents

Abstract

(57) [Summary] [PROBLEMS] To support a platform in a folded state by a platform support mechanism when the platform mechanism is turned upside down, the mechanical shock at that time is reduced, and the generation of an impact sound is prevented. I do. SOLUTION: A platform support mechanism 70 for supporting a lower surface of the platform when the platform 60 in a folded state is turned upside down on a link mechanism for driving up and down is provided on a body frame side, and the platform support mechanism is fixed to the body frame. An arm 71, a roller mounting arm 72 having one end pivotally attached to the distal end thereof, first and second rollers 73 and 74 pivotally attached to one end and the other end of the roller mounting arm, It has a connecting member 75 attached between the middle portion of the arm and the fixed arm, which expands and contracts by a spring, and the first roller 73 contacts the second roller 74 after the second roller 74 contacts the lower surface of the platform. I have.

Description

[Detailed description of the device]

[0001]

[Technical field to which the device belongs]

  The present invention is mounted on the rear part of a vehicle such as a lorry to raise and lower the platform. Related to the lifting device for the convenience of loading and unloading cargo, especially the platform The present invention relates to an underfloor retractable lifting device having a structure in which a boom is folded and stored under a vehicle floor.

[0002]

[Prior art]

  Conventionally, a platform for cargo handling has a folding structure, and the platform is As an underfloor retractable lifting device equipped with a structure that is stored under the floor of the vehicle body in a folded state The applicant of the present invention disclosed in Japanese Patent Application Laid-Open No. 8-150869 and Japanese Patent Application No. 2001-376442. I have some suggestions.

[0003]   In the case of such an underfloor retractable lifting device, the folded platform is When trying to flip over the lifting drive link mechanism, flip it up to 180 degrees at a time The impact will be excessive, so make sure the bottom surface of the platform is It is supported by a bar or roller as a structure, and the platform mechanism is linked by the lifting drive link mechanism. As the platform is lifted, the folded pla I am trying to reverse the to-home.

[0004]

[Problems to be solved by the device]

  As described above, the platform in the folded state is mounted on the lifting drive link mechanism. Support the underside of the platform with the bar or roller when trying to flip it up. Although the mechanism that allows the operation is simple in structure, the opening and closing operations of the operator's platform are rough. If there is a mechanical shock when the platform hits the bar or roller, The impact noise cannot be ignored.

[0005]   If the height of a lorry equipped with an underfloor retractable lifting device changes, It is necessary to adjust the position of the bar or roller that supports the lower surface of the platform. In the past, there were many cases where the position adjustment was not easy.

[0006]   In view of the above points, the first object of the present invention is to raise a folded platform. The link mechanism for descending drive is supported by the platform support mechanism when turned upside down, Underfloor retractable lifting equipment that mitigates mechanical shock at that time and prevents the generation of impact noise Is to provide storage.

[0007]   A second object of the present invention is to change the vehicle height of a lorry equipped with an underfloor retractable lifting device. Further change and adjustment of the support point on the bottom surface of the platform of the platform support mechanism An object is to provide an underfloor retractable lifting device that can be easily operated.

[0008]   Other objects and novel features of the present invention will be clarified in the embodiments described later. .

[0009]

[Means for Solving the Problems]

  In order to achieve the above object, the underfloor retractable lifting device according to the present invention comprises a main plate. (61), an intermediate plate (62) rotatably connected to the tip side of the main plate, and It consists of the tip side plate (63) rotatably connected to the tip side of A platform (60) whose top surface is flat in the state,   The platform frame is connected to the base end side of the main plate to connect the platform. Equipped with a lift drive link mechanism that drives the   The platform turns the tip side plate over the middle plate. And the intermediate plate on which the tip side plate is superposed on the main plate. The plate can be folded upside down on the plate and can be folded up freely. The lower surface of the platform when the boom is inverted to the upper side of the lifting drive link mechanism. A platform support mechanism (70) for supporting the is provided on the body frame side,   The platform support mechanism (70) is a fixed arm fixed to the body frame. (71) and a roller mounting arm (72) whose one end is pivotally attached to the tip of the fixed arm, , First and second rollers pivotally attached to the one end and the other end of the roller mounting arm. Between the roller (73, 74) and the intermediate part of the roller mounting arm and the fixed arm. A connecting member (75) which is attached and contracted by a spring and is attached to the platform. The first roller (73) after the second roller (74) hits the bottom surface of the frame. It is characterized by having a positional relationship that hits.

[0010]   In the underfloor retractable lifting device, the attachment point of the connecting member to the fixed arm. The position should be adjustable.

[0011]

[Embodiment of device]

  Hereinafter, an embodiment of an underfloor retractable lifting device according to the present invention will be described with reference to the drawings. .

[0012]   1 to 10, on a chassis 1 of a lorry, for example, a box-shaped body 2 is placed and fixed, and the fixed frame 4 of the underfloor retractable lifting device is a It is fixed to the rear of the chassis 1. Fixed frame 4 has a square pipe shape with slits The slide guide 5 is fixed.

[0013]   As shown in FIG. 7, the main body frame 10 of the underfloor retractable lifting device is provided with a connecting member. Square pipe 11 and brackets 12 and 13 fixed to both sides thereof, It has a pair of runners 14 fixed inside the brackets on both sides. The above The runner 14, which is integral with the body frame 10 with respect to the slide guide 5, is laterally (vehicle's The runner 14 is slidable in the front-back direction. It is extended downward through the slit and connected to the square pipe 11.

[0014]   The fixed frame 4 side, that is, the extended end of the slide guide 5 and the runner 14 In between is a hydraulic slide slide drive for moving the runner 14 laterally (forward and backward). Mounted in the hydraulic cylinder 15 and slide guide 5 A slide for driving the main body frame 10 in the lateral direction (front-back direction) with the runner 14 A drive mechanism is configured. That is, the extension of the piston rod of the cylinder 15 In the moving state, the main body frame 10 (runner 14) approaches the rear end side of the floor portion 3 of the vehicle body 2. On the contrary, in the contracted state, the main body frame 10 is pulled inward under the floor of the vehicle body. Becomes

[0015]   FIG. 8 shows a lifting / lowering drive link mechanism. The arm 20 and the main arm 25 connected thereto and the sub arm 35. There is. A small arm 20 is attached to the bracket 12 of the body frame 10 by a pin 21. The upper end of the lower arm is pivotally attached (rotatably attached), and the lower contact portion 20a of the small arm 20 is Is in contact with the stopper 16 on the side of the square pipe 11. Main arm 2 The base end portion of 5 is pivotally attached to the middle position of the small arm 20 by a pin 26, and the tip end portion thereof is a vertical link. A pin 31 is pivotally attached to the upper end of the body 30. Lower end and front of the small arm 20 The lifting hydraulic cylinder 27 is provided with a pin 28 between intermediate positions of the main arm 25 near the tip. , 29. Furthermore, the bracket 13 of the main body frame 10 and the A sub arm 35 is pivotally attached to the lower end of the direct link body 30 by pins 36 and 37. . The lower contact portion 20a of the small arm 20 contacts the stopper 16 on the side of the square pipe 11. While maintaining the state, the pins 26, 31 and the sub The pins 36 and 37 at both ends of the arm 35 are located at the vertices of the parallelogram, and When the descending hydraulic cylinder 27 contracts, the tip of the main arm 25 lowers and extends. When this is done, the tip of the main arm 25 is in the raised position. Cylinder 27 extension When the small arm 20 is rotated by the reaction force, the lower contact portion 20a is attached to the square pipe side stopper 16. It is blocked by the contact.

[0016]   The upper base end side of the mounting bracket body 40 is common to the upper end portion of the vertical link body 30. The adjustment mechanism 50 is attached to the lower portion of the mounting bracket body 40, which is pivotally attached by the pin 31. It is attached. This adjusting mechanism 50 is provided on the vertical portion 41 of the mounting bracket body 40. It has an adjusting bolt 52 screwed through a fixing bolt 51, and the tip of the adjusting bolt 52. The female part of the thread cutting pin 53 provided at the lower part of the vertical link body 30 (fitted). It is designed to be screwed into the screw part. In addition, the reinforcing plate 54 is the mounting bracket body 40. It is fixed along the inside of the vertical portion 41. Then, the rotation amount of the adjustment bolt 52 By adjusting, the positional relationship between the lower side of the mounting bracket body 40 and the lower side of the vertical link body 30 can be adjusted. The tilt of the mounting bracket body 40 can be adjusted by adjusting the engaging member (and by extension, Can adjust the tilt of the lifting platform 60 described later. ). Adjusting bolt When the rotation amount of 52 is determined, the fixing bolt 51 adjusts the adjustment bolt at the rotation position. Fix 52.

[0017]   The elevating platform 60 includes a main plate 61 and a rotating plate which is rotated toward the tip side of the main plate. The intermediate plate 62 connected to the present plate and the distal end side of the intermediate plate are rotatably connected It consists of the tip side plate 63, and the double hinge (rotation fulcrum is Two double hinges) are foldable and connected together. Main play The plate 61, the intermediate plate 62, and the tip side plate 63 are in a flat state Is the same as the reinforcing material 61a on the back side of the main plate 61 and the reinforcing material 62a on the back side of the intermediate plate 62. And the end face of the intermediate plate 62 and the end face of the tip side plate 63 are butted against each other, It functions as a flat plate platform with a flat top surface. Well In the folded state, the tip side plate 63 is turned over on the intermediate plate 62 and the In addition, these are turned over on the main plate 61 to be stacked.

[0018]   The mounting bracket body 40 and the main plate 61 base end can be freely rotated by a link 65. Are linked to. That is, one end of the link 65 is a pin 66 at one end of the mounting bracket. It is pivotally attached to the body 40 and the other end is pivotally attached to the main plate 61 with a pin 67, The pins 66 and 67 function as a double hinge. Lifting plastic When the platform 60 is unfolded, the vertical portion 41 of the mounting bracket body 40 and the main play When the reinforcing member 61a on the back side of the contact 61 comes into contact with the mounting bracket body 40, The main plate 61 is kept horizontal.

[0019]   As shown in FIG. 7, FIG. 9 and FIG. The platform support mechanism 70 is provided, and the platform support mechanism 70 is The fixed arm 71 fixed to the main body frame 10 and one end of the fixed arm 71 The roller mounting arm 72 having its end pivotally attached and the roller mounting arm 72 The first and second rollers 73 and 74 pivotally attached to the end and the other end, and With a connecting member 75 attached between the intermediate portion of the arm 72 and the fixed arm. There is.

[0020]   A fixed plate 80 fixed to the fixed arm 71 is formed with a long hole 81 in a lateral direction. The mounting bracket 83 that rotatably supports the shaft body 82 utilizes the long hole 81. It is fixed to the fixing plate 80 with bolts 84. In addition, the roller mounting arm 72 A shaft 85 is pivotally attached to the intermediate portion. The connecting member 75 is one shaft body 82. Through a bolt 86 whose tip is screwed to the other shaft body 85 and Collar with collar 87, washer 88, collar and washer of collar 87 with collar It is composed of a compression spring 89 arranged between 88 and nuts 90, 91, 92. . The nuts 90 and 91 determine the position of the washer 88, that is, the compression degree of the compression spring 89. The nut 92 and the bolt 86 is not loose with respect to the shaft body 85. Tighten as you like. With these, the connecting portion that expands and contracts by the spring 89 The material 75 is configured.

[0021]   The platform support mechanism 70 applies a downward force to the second roller 74. And the bolt 86 of the connecting member 75 move to the left in FIG. 9 against the elastic force of the compression spring 89. When the compression spring 89 contracts, the distance between the shaft bodies 82 and 85 is shortened. It That is, the platform 60 in the folded state (that is, as shown in FIG. When the back side of the plate 62) is supported by the platform support mechanism 70, first the second The roller 74 hits, but the roller 74 retracts, so the platform 60 hits. It is possible to mitigate the impact of the sagging and prevent the generation of impact noise.

[0022]   Next, the operation of the embodiment of the underfloor retractable lifting device will be described.

[0023]   When performing normal cargo handling work, as shown in FIG. 1, the slide drive hydraulic cylinder 1 is used. 5 is the extended state, and the runner 14 and the main body frame 10 are close to the floor end of the vehicle body 2. Main plate 61, which slides and constitutes the lifting platform 60, intermediate The plate 62 and the tip side plate 63 are developed in a flat plate shape (elevating platform). The folding and unfolding operation of the arm 60 is performed manually). And the link mechanism for lifting drive 8 to extend or lower the lifting hydraulic cylinder 27 of FIG. 8 that drives the main arm 25 of the By contracting, the main arm 25 and the sub arm 35 in the parallel link state The platform 60 from the landing state of the phantom line (a) in FIG. Maintain the horizontal state up to the position of the virtual line (b) at the height of the surface 3A (upper surface of the floor 3) It can be raised or lowered from the height of the floor 3A to the landing state. By using the lifting and lowering operation of the platform 60 as described above, it is possible to move from the ground to the floor of the vehicle body. Can perform cargo handling work from the floor of the vehicle body to the ground.

[0024]   Further, in the landing state of the lifting platform 60, the lifting hydraulic cylinder 2 When 7 is further contracted, as shown in FIG. 1, the lower contact portion 20 of the small arm 20 is a is separated from the stopper 16 on the side of the square pipe 11, and the mounting fulcrum of the main arm 25 (p 26) moves to the rear side of the vehicle body 2 and, therefore, as shown by the solid line (c) in FIG. The tilting motion of the platform 60 is executed to move the platform 60 to the platform 60 in the landing state. It is also possible to efficiently carry in or carry out luggage.

[0025]   The operation of storing the platform after the end of normal cargo handling is performed as follows. Figure 1 Solid line ( In the landing state of the lifting platform 60 of FIG. Turn over on the inter-plate 62 and then invert both as shown in FIG. Fold it on top of 61.

[0026]   Next, the main plate 61 is erected with respect to the mounting bracket body 40, and as shown in FIG. The back side of the intermediate plate 62 is attached to the second roller 74 of the platform support mechanism 70. Lean against it. At this time, the roller 75 The attached arm 72 rotates clockwise around the rotation fulcrum P, and the second roller 74 moves It retreats and absorbs the shock when leaning against it, and also suppresses the generation of shock noise. And rise By extending the descending hydraulic cylinder 27, the state shown in FIG. The main arm 25 and the sub arm 35 are substantially horizontal, and the platform support mechanism 7 Folded lifting platform 60 on first roller 73 of 0 Becomes

[0027]   By contracting the slide driving hydraulic cylinder 15 from the state shown in FIG. , The lifting platform 60 folded as shown in FIG. 6 is pulled under the floor of the vehicle body 2. It

[0028]   The operation of deploying the lifting platform 60 from the retracted state so that it can be handled is This is the reverse of the retracting operation. First, the slide driving hydraulic cylinder 15 is extended to move the runner. 14 and the main body frame 10 are moved to the rear end side of the floor portion 3 of the vehicle body 2 and then moved up and down. The main arm 25 and the sub arm 35 are landed by contracting the hydraulic cylinder 27. Until it reaches the position shown in FIG. The platform shape will be flat.

[0029]   According to this embodiment, the following effects can be obtained.

[0030] (1) Reverse the folded up / down platform 60 to the upper side of the up / down drive link mechanism. A plastic plate that supports the lower surface of the platform (the back side of the intermediate plate 62) when it is rolled over. The platform support mechanism 70 is provided on the main body frame 10 side, and The frame support mechanism 70 includes a fixed arm 71 fixed to the body frame 10 and the fixed arm 71. A roller mounting arm 72, one end of which is pivotally attached to the front end of the frame 71; First and second rollers 73 pivotally attached to the one end and the other end of the arm 72. , 74 and between the intermediate portion of the roller mounting arm 72 and the fixed arm 71. A connecting member 75 which is attached to the platform and expands and contracts by a spring. The lower surface of the first roller 73 The second roller is on the back side of the intermediate plate 62. When the roller mounting arm 72 is contacted with the roller mounting arm 72, the connecting member 75 contracts. It rotates clockwise about the rotation fulcrum P, and the second roller 74 retracts and folds. Absorbs and alleviates the impact when the platform 60 in the pure state is leaned against, and produces an impact sound. Can also be suppressed.

[0031] (2) As shown in FIGS. 9 and 10, the shaft body 82 to which one end of the connecting member 75 is attached The mounting position of the mounting bracket 83 holding the The height of a freight vehicle equipped with an underfloor retractable lifting device is different. In this case, the position of the mounting bracket 83 is changed, in other words, the connecting member 75 By changing the position of one mounting end and changing the inclination of the roller mounting arm 72, This can be dealt with by changing the position of the rail 74. Furthermore, it is screwed to the bolt 86. It is also possible to change the tightening position of the nuts 90, 91, 92 The position of 4 can be finely adjusted.

[0032]   Although the embodiment of the present invention has been described above, the present invention is not limited to this. Those skilled in the art can make various modifications and changes without departing from the scope of the claims without Would be self-evident.

[0033]

[Effect of device]

  As described above, according to the underfloor retractable lifting device according to the present invention, the folding type When the platform in a stationary state is inverted to the upper side of the link mechanism for raising and lowering the drive, By devising the structure of the platform support mechanism that supports the underside of the platform, mechanical impact It is possible to reduce the impact and prevent the generation of impact noise. Also, even if the vehicle height is different It is easy to adjust the position for supporting the platform in the folded state.

[Brief description of drawings]

FIG. 1 is a side view for explaining an elevating operation of an elevating platform in an embodiment of an underfloor retractable elevating apparatus according to the present invention.

FIG. 2 is a side view showing the first stage of the folding operation of the lifting platform according to the embodiment.

FIG. 3 is a side view showing a second stage of the folding operation of the lifting platform according to the embodiment.

FIG. 4 is a side view showing a third stage of the folding operation of the lifting platform according to the embodiment.

FIG. 5 is a side view showing a state in which the lifting platform according to the embodiment is completely folded and before being stored.

FIG. 6 is a side view showing a state where the lifting platform according to the embodiment is completely stored.

FIG. 7 is a plan view in which a part of the lifting platform is cut away when the lifting platform is completely stored in the embodiment.

FIG. 8 is a side view mainly showing a lifting link mechanism portion in the embodiment.

FIG. 9 is a side view of the platform support mechanism according to the embodiment.

FIG. 10 is a plan view of the same.

[Explanation of symbols]

1 chassis 2 car body 3 floor 4 fixed frame 5 Slide guide 10 body frame 11 square pipe 12,13 bracket 14 Lanna 20 small arms 25 main arm 27 Lifting hydraulic cylinder 30 Vertical link body 35 sub arm 40 mounting bracket body 50 adjustment mechanism 51 fixing bolt 52 Adjustment bolt 53 threaded pin 60 lifting platform 61 Main plate 62 Intermediate plate 63 Tip plate 70 Platform support mechanism 71 Fixed arm 72 Roller mounting arm 73,74 roller 75 Connection member 80 fixed plate 82,85 shaft 86 bolts 87 collar with collar 88 washers 89 Compression spring 90, 91, 92 nuts

Claims (2)

[Scope of utility model registration request] 1. A main plate (61), an intermediate plate (62) rotatably connected to the tip side of the main plate, and a tip side plate rotatably connected to the tip side of the intermediate plate.
(63), a platform (60) having a flat upper surface in the unfolded state, and a lifting drive link mechanism for connecting the main body frame side and the base end side of the main plate to drive the platform up and down. And the platform is turned upside down on the intermediate plate, the intermediate plate on which the distal side plate is superposed is turned upside down on the main plate, and is foldable. A platform supporting mechanism (70) for supporting the lower surface of the platform when the platform in the state is inverted to the upper side of the lifting drive link mechanism is provided on the main body frame side, and the platform supporting mechanism (70) is the main body frame. Fixed arm (71) fixed to the roller, and a roller mounting with one end pivotally attached to the tip of the fixed arm Frame (72), first and second rollers (73, 74) pivotally attached to the one end and the other end of the roller mounting arm, and between the intermediate portion of the roller mounting arm and the fixed arm. And a connecting member (75) which is attached to the spring and expands and contracts by a spring, and in which the first roller (73) contacts the lower surface of the platform after the second roller (74) contacts the lower surface of the platform. An underfloor retractable lifting device characterized in that 2. The underfloor retractable lifting device according to claim 1, wherein a mounting point of the connecting member to the fixed arm is positionally adjustable.