JP4310257B2 - Loading platform lifting device - Google Patents

Description

  The present invention relates to a slidable load receiving device lifting device mounted on a truck.

  For example, an underfloor retractable cradle lifting device that is stored under the floor behind a lorry is pulled out backward from the stored state by a horizontal slide during use. In order to make such a sliding operation smooth, a bush (sliding member) slides in a horizontally extending hollow guide portion, and a device that supports the lifting device by this bush has been proposed (for example, Patent Documents). 2). The bush is formed in a size smaller than the inner shape of the guide portion so that it can be easily inserted into the guide portion.

JP-A-11-192880 (pages 4-5, FIG. 1)

However, in the conventional load receiving platform elevating device as described above, since the bush is smaller than the inner shape of the guide portion, the bush rattles to the left and right (vehicle width direction) during sliding, and a smooth sliding operation cannot be performed.
In view of the conventional problems as described above, an object of the present invention is to provide a load receiving table lifting device capable of a smooth sliding operation.

The present invention relates to a load receiving platform lifting apparatus that is slidably attached to a vehicle body, and is a member that is fixed to the vehicle body, having a hollow guide portion that extends in a horizontal direction, and a vertical cross section perpendicular to the direction. In the shape, at least one of the ceiling surface and the bottom surface of the guide portion has a slide rail formed with a pair of left and right inclined surfaces that are reversely inclined to each other, and an inclined surface that has a shape that matches the inclined surface. A sliding member that can move within the guide portion while sliding the surfaces together, and an elevating device supported by the sliding member are provided.
In the load receiving platform elevating device configured as described above, the centering action for the sliding member is exerted by the sliding contact between the inclined surfaces between the guide portion and the sliding member, and rattling to the left and right is performed. Is prevented.

Further, the present invention provides a load receiving platform elevating device that is slidably mounted on a vehicle body, the member being fixed to the vehicle body, having a hollow guide portion extending in a horizontal direction, and orthogonal to the direction. In the vertical cross-sectional shape, a slide rail in which a pair of left and right upper inclined surfaces and a lower inclined surface that are reversely inclined to each other are formed on the ceiling surface and floor surface of the guide portion, and a shape that matches the upper inclined surface An inclined surface on the upper surface, a front sliding member that can move within the guide portion while sliding the inclined surfaces in contact with each other, and an inclined surface having a shape that matches the lower inclined surface on the lower surface. It is supported by the rear sliding member that can move in the guide part while sliding the surfaces in contact with each other, and the front sliding member and the rear sliding member. Push up The grant is obtained by a lifting device that applies a force to depress it down against the rear sliding member.
In the load receiving table lifting apparatus configured as described above, sliding is performed by sliding the inclined surfaces between the upper inclined surface of the front sliding member to which the pushing force is applied and the upper inclined surface of the guide portion. The centering effect on the moving member is exhibited, and rattling to the left and right is prevented. In addition, due to the sliding contact between the inclined surfaces between the lower inclined surface of the rear sliding member to which the pressing force is applied and the lower inclined surface of the guide portion, the centering effect on the sliding member is exhibited, Shaking is prevented. In this way, rattling between the two inclined surfaces at the front and rear is prevented.

  According to the load receiving platform lifting apparatus of the present invention, the sliding action between the inclined surfaces between the guide portion and the sliding member exerts the aligning action on the sliding member and prevents rattling from side to side. The In this way, by preventing rattling, the lifting device supported by the sliding member can slide smoothly.

  FIG. 1 is a side view of a cargo receiving platform lifting apparatus according to an embodiment of the present invention in a state of being mounted on a vehicle body. This state represents a state in which the cargo receiving platform lifting apparatus 1 is stored under the floor of the vehicle body 2, that is, a travelable state. On the other hand, FIG. 2 shows a use state in which the entire load receiving platform lifting device 1 is horizontally slid rearward from the state shown in FIG. 1 to reach a predetermined slide rear end position (extension position) and then the load receiving platform is unfolded and lifted. FIG.

  In FIG. 2, a pair of left and right fixed support members 100 provided in the vehicle width direction of the load receiving platform lifting / lowering device 1 are respectively mounted on a slide rail 101 extending horizontally in the front-rear direction and the frame 2 f of the vehicle body 2. And a plurality of (three in this example) brackets 102. FIG. 8 is a view of a vertical section of the rearmost bracket 102 in FIG. 2 as viewed from the rear side, and the slide rail 101 is an aluminum die-cast member having a cross-sectional shape as illustrated. The slide rail 101 and each bracket 102 are fastened by two bolts and nuts 103. A hollow guide portion 101a extending in the horizontal direction is formed below the inside of the slide rail 101, and a sliding member 112 firmly connected to the support plate 111 is maintained with a slight gap between the guide portion 101a. It is mounted so as to be movable in the longitudinal direction of the vehicle body in the guide portion (details will be described later).

  Returning to FIG. 2, the pair of left and right support plates 111 pass through a connecting member 113 made of a square pipe extending horizontally in the vehicle width direction (note that the square pipes are stacked in three stages for reinforcement at both ends. Only one is installed in the vehicle width direction.) These are welded together. Other support plates 114 and 115 are integrally welded to the connecting member 113 outside the support plate 111 in the vehicle width direction. A pair of left and right support plates 114 and 115 are also provided. The support plate 111, the sliding member 112, the connecting member 113, and the support plates 114 and 115 constitute a movable side support member 110 that can slide in the vehicle longitudinal direction with respect to the fixed side support member 100.

  An auxiliary link 121 is rotatably attached to the support plate 114 within a certain range, and an upper arm 122 and a lift cylinder 123 are rotatably attached to the auxiliary link 121. The tip of the lift cylinder 123 is connected to a predetermined position of the upper arm 122, and applies torque to the upper arm 122 by an expansion / contraction operation. A lower arm 124 is rotatably attached to the support plate 115. The upper arm 122 and the lower arm 124 constitute a parallel link in which a quadrilateral connecting their fulcrums and action points forms a parallelogram, and the tip side thereof is moved up and down by the expansion and contraction of the lift cylinder 123. A stopper bolt 125 is attached to the upper arm 122 so that the protrusion length can be adjusted. The tip of the stopper bolt 125 abuts on the upper part of the support plate 114, and the upper end of the parallel link (upper arm 122 and lower arm 124) is used. The auxiliary link 121, the upper arm 122, the lift cylinder 123, the lower arm 124, and the stopper bolt 125 are provided in a pair on the left and right sides to constitute an arm type lifting device 120.

The load receiving stand 130 is horizontally attached to the distal ends of the upper arm 122 and the lower arm 124, and includes a main plate 131 and a sub plate 132 connected to the main plate 131 so as to be foldable and unfoldable. When stored, the sub plate 132 is folded on the main plate 131. In use, the sub plate 132 is unfolded, and a continuous receiving surface from the main plate 131 to the sub plate 132 is formed.
In addition, a roller mounting plate 141 is attached to each of the pair of left and right support plates 111 so as to protrude rearward, and a guide roller 142 is rotatably attached to the rear end thereof. The tip of the sub plate 132 can be placed on the guide roller 142.

Next, the structure of the slide rail 101 and the sliding member 112 will be described in detail.
FIG. 9 is an enlarged cross-sectional view of only the slide rail 101 as viewed in a vertical cross section (same as FIG. 8) orthogonal to the direction in which the guide portion 101a extends. A slit S through which the support plate 111 passes is formed in the center of the floor surface of the guide portion 101a, and a pair of symmetrical lower inclined surfaces 101c inclined downward at an angle θ1 toward the outside are formed on both sides. Yes. On the other hand, a pair of left and right symmetrical upper inclined surfaces 101d are formed on the ceiling surface of the guide portion 101a, and these are inclined downward at an angle θ2 toward each other. That is, both the lower inclined surface 101c and the upper inclined surface 101d are in a relationship of being inclined in a reverse pair with each other. The angles θ1 and θ2 are, for example, θ1 = θ2 = 5 degrees. In addition, a hole 101e for attaching a seal (not shown) for preventing intrusion of muddy water or the like into the guide portion 101a is formed in the lower portion of the guide portion 101a.

  FIG. 10A is a side view showing only the support plate 111 and the sliding member 112, and FIG. 10B is a view of this from the rear. A columnar rod portion 111a is projected laterally on the front and rear portions above the support plate 111, and a vertically oriented pin 111b is further provided. A sliding member 112 is formed of a resin mold so as to enclose the rod portion 111a and the pin 111b. In (b), on the lower surface of the sliding member 112, a pair of left and right symmetrical lower inclined surfaces 112c that are inclined downward toward the outside with the support plate 111 interposed therebetween are formed. This inclination angle is the same as θ1, and the shape of the lower inclined surface 112c matches the lower inclined surface 101c of the guide portion 101a. On the other hand, a pair of symmetrical upper inclined surfaces 112d are formed on the upper surface of the sliding member 112, and these are inclined downward toward each other. This inclination angle is the same as θ2, and the shape of the upper inclined surface 112d matches the upper inclined surface 101d of the guide portion 101a. That is, both the lower inclined surface 112c and the upper inclined surface 112d are in a pair of left and right that are reversely inclined to each other, and the shape thereof matches the inclined surface of the corresponding guide portion 101a.

  A pair of sliding members 112 is provided on the front side and the rear side of the support plate 111. Here, the front and rear sliding members are referred to as a front sliding member 112F and a rear sliding member 112R, respectively. The support plate 111 supports the weight of each of the movable members such as the lifting device 120 via the connecting member 113, and the center of gravity of the own weight is behind the connecting member 113 (to the right in (a)). Therefore, at least the elevating device 120 applies a force to push up the front sliding member 112F and applies a force to push it down to the rear sliding member 112R.

FIG. 11 is a view showing the front sliding member 112F in the guide portion 101a. As described above, the front sliding member 112F is given a force to push it upward, so that the upper inclined surface 112d of the front sliding member 112F becomes the upper inclined surface 101d of the guide portion 101a. Abut. Conversely, a gap is formed between the lower inclined surface 112c and the lower inclined surface 101c of the guide portion 101a.
FIG. 12 is a view showing the rear sliding member 112R in the guide portion 101a. As described above, since the rear sliding member 112R is given a force to push it down, the lower inclined surface 112c of the rear sliding member 112R contacts the lower inclined surface 101c of the guide portion 101a. . Conversely, a gap is formed between the upper inclined surface 112d and the upper inclined surface 101d of the guide portion 101a.

  In the state shown in FIGS. 11 and 12, when the sliding member 112 (112F, 112R) moves in the guide portion 101a while sliding the inclined surfaces, the alignment action by the contact between the inclined surfaces is exhibited. Left and right rattling in the width direction is prevented. In this way, rattling of the sliding member 112 in the pair of left and right slide rails 101 is prevented, so that the lifting device 120 and other movable members supported by the sliding member 112 slide smoothly. Can do.

  Next, a slide mechanism (a drive mechanism for a slide operation) not shown in FIG. 2 will be described. FIG. 3 is a plan view of the slide mechanism 150. The slide mechanism 150 is located between the left and right slide rails 101 in the vehicle width direction and extends in the front-rear direction of the vehicle body. The slide rail 101 is attached at substantially the same height. Main members constituting the slide mechanism 150 are a slide cylinder 151 and a chain 152. A support shaft 153 is attached to the end of the slide cylinder 151 on the rod side so as to be T-shaped. The support shaft 153 is attached to the mounting plate 154 so as to be rotatable around the axis with the vehicle width direction as an axial direction. The mounting plate 154 is fixed to the cross member 104 installed on the pair of left and right slide rails 101.

  4 and 5 are a plan view and a side view, respectively, showing only the main part of the slide mechanism 150. In each figure, (a) shows a state in which the slide cylinder 151 is most contracted, and (b) shows a predetermined state. This shows a state in which the extension operation has been performed up to the position. In each figure (a), sprocket support portions 155 and 156 are provided at both front and rear ends of the cylinder tube of the slide cylinder 151, and two rows of sprockets 157 (FIG. 5) are rotatably attached thereto. Yes. A chain 152 is stretched between the front and rear sprockets 157 in two rows.

  Specifically, each chain 152 includes two chains 152a and 152b (FIG. 5), and one end of each chain 152 is connected to a chain connecting member 158. The chain connecting member 158 is fastened to the cover 159. Further, the cover 159 is connected to the mounting plate 154 at the front end thereof. Therefore, even if the slide cylinder 151 is expanded and contracted, the chain connecting member 158 does not move back and forth and is fixed at the position shown in the figure. The other ends of the chains 152a and 152b are fixed to the chain connecting member 160. The chain connecting member 160 is fixed to the connecting member 113 of the lifting device 120 (FIG. 2). Accordingly, when the chain connecting member 160 moves back and forth, the lifting / lowering device 120 performs a sliding operation. The chain 152 configured in this manner forms a loop so as to surround the cylinder tube of the slide cylinder 151 when viewed from the side (FIG. 5).

  When the slide cylinder 151 starts to extend from the state shown in FIG. 5A, the cylinder tube tends to move backward (rightward in the figure). As a result, the front and rear sprockets 157 rotate counterclockwise, and the lower half of the chain 152 is fed backward. Accordingly, the chain connecting member 160 is also sent backward. The amount of movement at this time is double the amount of extension of the slide cylinder 151, and feed with doubled stroke is realized. That is, the moving amount L until the movable side support member 110 finally stops at the predetermined rear end position is twice the stroke S.

  Next, the structure of the overhang position adjusting device 50 that defines the slide retreat position in the slide operation will be described. FIG. 6 is an enlarged side view of the vicinity of the slide rail 101 with the lifting device 120 and the load receiving table 130 omitted from FIG. FIG. 7B is an enlarged view of the portion VII in this figure, and FIG. 7A is a plan view thereof. 7 and 8, a rectangular parallelepiped adjusting member 51 is attached to a predetermined position behind the slide rail 101 by a pair of bolts and nuts 52 penetrating therethrough. The bolt head 52a of the bolt / nut 52 is inserted into a groove 101b (FIG. 8) formed through the side surface of the slide rail 101 in the front-rear direction. When the nut 52b is tightened, the adjustment member 51 is moved to the slide rail 101. The nut 52b can be loosened and moved back and forth.

  In FIG. 7, the front side surface of the adjustment member 51 is provided with a stopper bolt 53 and a bolt 55 (hatched for convenience of identification with 53) that serves as a detection dog of the proximity sensor 54. It is attached to the front side with adjustable protrusion length. On the other hand, a stopper member 57 is attached to the support plate 114 with bolts and nuts 56. The stopper member 57 is integrally formed with a contact portion 57a with the stopper bolt 53 (see also FIG. 8).

In the overhang position adjusting device 50 described above, the movable side support member 110 (FIG. 2) slides rearward and the contact portion 57 a of the stopper member 57 attached to the support plate 114 contacts the stopper bolt 53. Will stop the slide. Therefore, the slide rear end position can be variably defined by adjusting the position of the adjustment member 51 back and forth.
1 is slid rearward from the retracted state of FIG. 1, and when the contact portion 57a contacts the stopper bolt 53, the proximity sensor 54 detects the bolt 55. Based on this detection signal, the extension operation of the slide cylinder 151 is stopped, and the contraction operation of the lift cylinder 123, which is the next operation, is performed. That is, the proximity sensor 54 detects the timing when the operation of the lift cylinder 123 starts from the slide operation.

  Next, the operation of the load receiving table lifting apparatus configured as described above will be briefly described. First, the loading platform elevating device 1 in the retracted state shown in FIG. 1 is slid rearward by the slide mechanism 150 and moved backward to a predetermined backward end. When the lift cylinder 123 is contracted from here, the upper arm 122 and the lower arm 124 descend and land as shown by the solid line in FIG. At this time, the main plate 131 is horizontal, and the tip of the sub plate 132 is on the guide roller 142. Next, the sub-plate 132 is raised by hand and laid down horizontally. In this way, the cargo receiving platform 130 is deployed horizontally. When the lift cylinder 123 is extended in this state, the load receiving base 130 can be raised to the illustrated rising end position while keeping the load receiving stand 130 horizontal. At this time, the stopper bolt 125 is in contact with the support plate 114.

  Further, if the lift cylinder 123 is contracted from the ascending end position, the load receiving table 130 can be lowered to the original position. When the lift cylinder 123 is further contracted after the lower arm 124 has landed, the load receiving platform 130 is tilted by the action of the auxiliary link 121 so as to lower its tip, and it is easy to load and unload the load along the ground. become able to. In order to store the load receiving table 130, the sub plate 132 is erected from the state where the lower arm 124 is landed and the load receiving table 130 is horizontal, and is further put on the guide roller 142. Next, the upper arm 122 and the lower arm 124 are raised, and the sub plate 132 is folded on the main plate 131. Then, the slide mechanism 150 is operated, and the movable side support member 110, the elevating device 120, and the load receiving table 130 are drawn to the storage position, and the state shown in FIG.

In the above embodiment, the guide member 101a and the sliding member 112 are provided with inclined surfaces on the upper and lower sides. However, a certain centering action can be obtained even with only one of the upper or lower inclined surfaces, and the left and right rattles. Can be prevented.
Moreover, although the load receiving platform lifting / lowering device 1 according to the above embodiment uses the load receiving stand 130 that is folded in two stages by the main plate 131 and the sub plate 132 (in a two-stage stacked state when stored), the load receiving stand is folded in three steps. It may be the structure.

It is a side view of the load receiving table raising / lowering device by one Embodiment of this invention of the state mounted by the vehicle main body. It is a side view which shows the use state which expands and raises / lowers a load receiving stand, after sliding the whole load receiving stand raising / lowering apparatus back from the state of FIG. 1 and making it reach | attain a predetermined slide rear end position (extension position). It is a top view of the slide mechanism in the said load receiving table raising / lowering apparatus. It is a top view which shows only the principal part of the said slide mechanism, (a) shows the state which the slide cylinder contracted most, (b) has shown the state which extended | stretched to the predetermined position. It is a side view which shows only the principal part of the said slide mechanism, (a) shows the state which the slide cylinder contracted most, (b) has shown the state which extended | stretched to the predetermined position. It is the side view which abbreviate | omitted the raising / lowering device and the receiving stand from FIG. 2, and expanded the slide rail vicinity. (B) is the figure which expanded the VII part of FIG. 6, (a) is the top view. It is the figure which looked at the perpendicular cross section of the last bracket in FIG. 2 from the back side. It is the expanded sectional view which looked at only the slide rail in the perpendicular cross section orthogonal to the direction where a guide part extends. (A) is a side view which shows only a support plate and a sliding member, (b) is the figure which looked at this from back. It is a figure which shows the front part sliding member in a guide part. It is a figure which shows the rear part sliding member in a guide part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cargo stand elevating device 2 Car body 101 Slide rail 101a Guide part 101c Lower inclined surface 101d Upper inclined surface 112 Sliding member 112c Lower inclined surface 112d Upper inclined surface 112F Front sliding member 112R Rear sliding member 120 Elevating device

Claims (2)

In the cradle lifting device that is slidably attached to the vehicle body,
A member fixed to the vehicle body, having a hollow guide portion extending in one direction, and having a cross-sectional shape perpendicular to the direction, at least one of an upper surface and a lower surface of the guide portion that are oppositely inclined to each other A slide rail having a pair of inclined surfaces;
A sliding member that has an inclined surface that matches the inclined surface, and is movable within the guide portion while sliding the inclined surfaces together;
A lifting platform supported by the sliding member. In the load receiving platform lifting device attached to the vehicle body so as to be horizontally slidable,
Left and right members that are fixed to the vehicle body and that have a hollow guide portion extending in the horizontal direction, and inclining oppositely to the ceiling surface and floor surface of the guide portion in a vertical cross-sectional shape perpendicular to the direction. A slide rail formed with a pair of upper and lower inclined surfaces, and
A front sliding member that has an inclined surface on the top surface that matches the upper inclined surface, and is movable within the guide portion while sliding the inclined surfaces together;
A rear sliding member that has an inclined surface on the lower surface that matches the lower inclined surface, and is movable within the guide portion while sliding the inclined surfaces together;
Supported by the front sliding member and the rear sliding member, by its own weight, it applies a force to push up the front sliding member, and pushes it down to the rear sliding member. A load receiving table lifting device comprising: a lifting device for applying force.

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