JP4310260B2 - Loading platform lifting device - Google Patents

Description

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

  The underfloor retractable load receiving platform lifting device that is stored under the floor behind the lorry has a guide rail horizontally attached to the vehicle body side, and the folded load receiving platform and lifting device are connected to the retracted position. It is configured to be slidable between positions. The load receiving table in the retracted position is pressed from above by a leaf spring, thereby preventing the load receiving table from jumping up during traveling (see, for example, Patent Document 1).

Japanese Patent Laying-Open No. 2003-25901 (FIGS. 1 and 3)

In the conventional load receiving table elevating device as described above, when an upward force exceeding the urging force is applied to the leaf spring due to vibration during traveling, the leaf spring cannot fully hold the load receiving plate, and the load receiving plate jumps greatly. For example, when the load receiving table hits a member on the vehicle body side due to the jumping up, the load receiving table itself or the member on the vehicle body side is also damaged.
In view of the conventional problems as described above, an object of the present invention is to provide a load receiving table lifting device that reliably prevents the load receiving table from jumping while traveling.

The load receiving platform lifting device of the present invention includes a fixed-side support member attached to a vehicle body, a movable-side support member slidably attached to the fixed-side support member, and a lifting device attached to the movable-side support member; A load receiving base that is foldably attached to the lifting device, a slide mechanism that slides the movable support member, and a first movement that is attached to the movable support member and restricts the downward movement of the folded load support base. A regulating member, a pressing member provided at a predetermined position of the fixed-side support member, and a folding member that is attached to the movable-side support member and is engaged with the pressing member when the load receiving platform is in the retracted position. It is possible to move to a restricting position that restricts the upward movement of the cargo receiving platform, and when the cargo receiving platform is in the extended position, it can be moved to a release position that allows the upward movement of the cargo receiving platform. It is obtained by a second movement restricting member.
In the load receiving platform lifting apparatus configured as described above, when the load receiving stand is in the retracted position, the second movement restricting member engaged with the pressing member moves to the restricting position to restrict the upward movement of the load receiving stand. . The first movement restricting member restricts the downward movement of the load receiving table. As a result, the movement of the cradle is restricted from above and below.

Moreover, in the said load receiving table raising / lowering apparatus, you may provide the urging means which urges | biases so that a 2nd movement control member may be moved to a release position.
In this case, since the second movement restricting member automatically moves to the release position at the extended position, the movement restriction by the second movement restricting member is always released when the load receiving base is folded or unfolded. Therefore, the folding and unfolding operations are easy in that the folding and unfolding of the load receiving platform is not hindered by the second movement restricting member.

Further, in the load receiving platform lifting device, the pressing member moves the second movement restricting member to the restricting position only when the load receiving stand is in the retracted position, and between the second movement restricting member and the load receiving stand in other than the retracted position. It is preferable that a gap is formed.
In this case, since there is a gap between the second movement restricting member and the cradle other than the storage position, wear damage of the second movement restricting member due to the slide can be prevented.

Further, in the load receiving table elevating device, the first movement restricting member may be a guide roller for placing the first load restricting member when the load receiving table is folded.
In this case, since the guide roller can also be used as the first movement restricting member, the configuration is simple and inexpensive.

  According to the load receiving platform lifting apparatus of the present invention, when the load receiving stand is in the retracted position, the second movement restricting member engaged with the pressing member moves to the restricting position and restricts the upward movement of the load receiving stand. Along with the downward movement restriction of the load receiving table by the one movement restricting member, the movement of the load receiving bed is restricted from above and below. Therefore, it is possible to provide a load receiving table lifting device that reliably prevents the load receiving table from jumping up.

  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 load receiving platform lifting device 1 is slid backward from the state of 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 longitudinal direction of the vehicle body is formed below the inside of the slide rail 101, and a sliding member 112 that is firmly connected to the support plate 111 while maintaining a slight gap with the inner wall surface. Is slidably mounted in the longitudinal direction of the vehicle body.

  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 tips 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 hard rubber guide roller 142 (first movement restricting member) is rotatable at the rear end thereof. It is attached. The tip of the sub plate 132 can be placed on the guide roller 142. The guide roller 142 at the time of storage shown in FIG. 1 also has a function as a member that restricts the downward movement of the folded load receiving table 130.

  Next, a slide mechanism 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 a cross member 105 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. Thus, the slide rail 101 that slidably supports the movable support member 110 via the support plate 111 is also used to support the adjustment member 51.

  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, a structure for preventing the stored load receiving base 130 from jumping will be described. In FIG. 1, a restriction arm 143 is rotatably attached to each of the roller attachment plates 141 provided on the left and right sides of the vehicle body. One end of the spring 144 as the urging means is locked to the roller mounting plate 141 and the other end is locked to the restricting arm 143 to urge the restricting arm 143 counterclockwise. A hard rubber roller 145 is rotatably attached to the tip of the restriction arm 143. The restriction arms 143 and the rollers 145 constitute a second movement restriction member that restricts the upward movement of the load receiving table 130.

  FIG. 10 is an enlarged view of the restriction arm 143 and the like in FIG. In the figure, a pressing member 104 is fixed to the slide rail 101, and an end of the pressing member 104 wraps around the lower surface 101c of the slide rail 101 to form a convex portion 104a having a plate thickness. In this state, the convex portion 104a of the pressing member 104 pushes the roller 145 downward against the spring 144. For this reason, the front end portion 132a of the sub-plate 132 of the load receiving base 130 has a guide roller 142, a roller 145, It is in a state where movement is restricted both above and below. The positions of the restriction arm 143 and the roller 145 at this time are defined as “restriction positions”.

  On the other hand, in the state of FIG. 9 in which the elevating device 120 and the load receiving table 130 are slid to the extended position together with the movable support member 110, the roller 145 is detached from the lower surface 101c of the slide rail 101 and is in contact with the rear surface 101d. FIG. 11A is an enlarged view of the regulating arm 143 and the like at this time. When the roller 145 is disengaged from the lower surface 101c of the slide rail 101, the restricting arm 143 rotates counterclockwise by the bias of the spring 144. As a result, the roller 145 is separated from the front end portion 132 a of the sub plate 132 and is pressed against the rear surface 101 d of the slide rail 101 by the force of the spring 144. The positions of the restriction arm 143 and the roller 145 at this time are referred to as “release position”.

  FIG. 11B is a side view showing the state of the regulating arm 143 immediately after starting sliding in the retracting direction from the extended position (or just before reaching the extended position by sliding). In comparison with FIG. 10, the regulating arm 143 is disengaged from the convex portion 104 a of the pressing member 104, and is rotated upward by the biasing force of the spring 144. Therefore, a gap G is formed between the front end portion 132a of the sub plate 132 and the roller 145. In this state, the roller 145 can smoothly roll on the lower surface 101c of the slide roller 101, and the rotating roller 145 does not touch the front end portion 132a of the sub plate 132, so that the roller 145 and the front end portion 132a are worn. I don't have to.

  Next, the operation of the load receiving platform lifting apparatus configured as described above will be described. First, the stowage receiving device lifting apparatus 1 in the retracted state shown in FIG. 1 is slid rearward by the slide mechanism 150 and retracted to a predetermined retracted end shown in FIG. Here, the restriction arm 143 and the roller 145 are automatically in the release position, and do not hinder the upward movement of the front end portion 132a of the load receiving base 130. Therefore, unfolding of the cargo receiving platform 130 from this state (or conversely folding up to this state) is not hindered. 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, while the sub-plate 132 has a tip 132a 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.

  Next, in order to store the load receiving table 130, the sub-arm 132 is raised from the state where the lower arm 124 is landed and the load receiving table 130 is horizontal, and the tip 132a is placed on the guide roller 142 (FIG. 11). (Refer to the two-dot chain line in (a).) At this time, since the restriction arm 143 and the roller 145 are in the release position, they do not interfere with the distal end portion 132a. Therefore, the front end portion 132a of the load receiving table 130 can be reliably put on the guide roller 142. Next, when the upper arm 122 and the lower arm 124 are raised and the sub plate 132 is folded on the main plate 131, the state shown in FIG. 9 is obtained. From this state, the slide mechanism 150 is operated, and the retracting of the movable side support member 110, the elevating device 120, and the load receiving table 130 is started.

  Immediately after the pull-in starts, the roller 145 rotates clockwise as shown in FIGS. 11A to 11B and rolls on the lower surface 101c from the state in contact with the rear surface 101d of the slide rail 101. To change. When the roller mounting plate 141 moves forward by sliding in the retracted direction from the state of (b), the roller 145 rotates in the clockwise direction, but there is a gap G between the tip portion 132a of the sub-plate 132. The tip portion 132a of the sub plate 132 is not rubbed. Therefore, the abrasion damage of the roller 145 and the tip end portion 132a does not occur, and the roller 145 is smoothly rotated.

  In this way, while the roller 145 rolls on the lower surface 101c of the slide rail 101, the movable support member 110, the lifting device 120 and the load receiving table 130 slide forward, and finally the storage state shown in FIG. At this time, the roller 145 is pushed down by the convex portion 104 a of the pressing member 104 in FIG. 10, and the tip end portion 132 a of the sub plate 132 is sandwiched between the guide roller 142 and the roller 145. That is, the restricting arm 143 and the roller 145 hold the tip end portion 132a from above and restrict the tip end portion 132a from moving upward. Further, the guide roller 142 supports the tip portion 132a from below, and restricts the tip portion 132a from moving downward. As a result, the tip end portion 132a of the load receiving table 130 is in a state where movement is restricted both in the upper and lower directions, and the jumping of the load receiving table 130 during traveling can be reliably prevented. In addition, by using the guide roller 142 originally intended to lean the load receiving table 130 as a downward movement restricting member, the number of parts can be reduced as compared with the case where a dedicated downward movement restricting member is provided. Therefore, the configuration is simple and inexpensive.

In the above-described embodiment, the regulating arm 143 is biased upward by the spring 144. Even if the spring 144 is omitted, the distal end portion 132a of the sub-plate 132 and the guide roller 142 are in the retracted position. Since it is sandwiched between the rollers 145, there is no change in that it is possible to reliably prevent the load receiving base 130 from jumping up during traveling.
Moreover, although the pressing member 104 in the said embodiment was provided only in the position corresponding to the storing position, you may provide it in another position as needed. Further, the pressing member 104 can be formed integrally with the slide rail 101.

  In the above-described embodiment, the guide roller 142 for causing the load receiving base 130 to stand is also used as a member for restricting the downward movement of the load receiving base 130 after storage. A downward movement restricting member may be provided. However, as described above, the dual use is preferable for a simple and inexpensive configuration.

  In addition, 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 (two stacked state when stored) by the main plate 131 and the sub plate 132, the load receiving stand is folded in three steps. It may be the structure.

It is a side view in the retracted state of the load receiving table lifting / lowering device according to one embodiment of the present invention. 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 a side view which shows the state which has a load receiving stand raising / lowering apparatus in an overhanging position. It is the side view to which the control arm in the storing position of Drawing 1 and its circumference were expanded. (A) is the side view which expanded the control arm in the overhanging position, and its periphery. (B) is the side view which expanded the control arm and its periphery immediately after starting a slide to the storing direction from an overhang position.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cargo stand raising / lowering device 2 Car body 100 Fixed side support member 104 Pushing member 110 Movable side support member 120 Lifting device 130 Cargo stand 142 Guide roller (1st movement control member)
143 Restriction arm (second movement restriction member)
144 Spring (biasing means)
145 roller (second movement restricting member)
150 slide mechanism

Claims (4)

A fixed-side support member attached to the vehicle body;
A movable support member slidably attached to the fixed support member;
A lifting device attached to the movable support member;
A cradle attached to the lifting device in a foldable manner;
A slide mechanism for sliding the movable side support member;
A first movement restricting member attached to the movable side support member and restricting the downward movement of the folded cradle;
A pressing member provided at a predetermined position of the fixed-side support member;
When the load receiving table is attached to the movable side support member and is in the retracted position, the load receiving table moves to a restricting position for restricting the upward movement of the folded load receiving table by engaging with the pressing member. And a second movement restricting member that is movable to a release position that allows upward movement of the load receiving table when the load receiving stand is in the extended position.   The load receiving table elevating device according to claim 1, further comprising an urging unit that urges the second movement restricting member to move to the release position.   The pressing member moves the second movement restricting member to the restricting position only when the load receiving table is in the retracted position, and a gap is formed between the second movement restricting member and the load receiving stand in other than the retracted position. The load receiving table elevating device according to claim 2.   The load receiving table lifting device according to any one of claims 1 to 3, wherein the first movement restricting member is a guide roller for holding the load receiving stand when folded.

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