JP6670068B2 - Loading platform lifting device - Google Patents

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a loading tray elevating device mounted on a vehicle, and more particularly to a loading tray elevating device for lifting a loading tray along a pair of left and right posts.

  In the case of a loading tray elevating device provided with a pair of left and right posts with respect to the vehicle, the loading tray 91 moves up and down along the post 92 as shown in FIG. The lifting and lowering of the load receiving table 91 is performed by expansion and contraction of a hydraulic cylinder 93, and most of the hydraulic cylinder 93 is provided in a cross member 94 provided between the posts 92.

  The receiving table 91 is supported by a slider 95 that can move up and down in the post 91, and the slider 95 and the hydraulic cylinder 93 are connected by a wire (not shown). This wire is stretched via a sheave (not shown) installed inside the post 92 and the cross member 94 (for example, Patent Document 1), and transmits the expansion and contraction force of the hydraulic cylinder 93 to the slider 95.

Japanese Patent No. 3857282

  By the way, among the above-mentioned sheaves, there are sheaves fixed to the upper part of the post 92 and both ends of the cross member 94, but also the sheave 96 attached to the tip of the rod 93a of the hydraulic cylinder 93 as shown in FIG. is there. The sheave 96 rolls in the cross member 94 in accordance with the expansion and contraction of the rod 93a.

  The inside of the cross member 94 in which the hydraulic cylinder 93 and the sheave 96 are installed is small, and the cover 94a on the vehicle rear side can be removed, but there is no other opening. Therefore, the work of installing the sheave 96 and the maintenance work inside the cross-member main body 94b having a U-shaped cross section are performed by putting a hand through the opening from which the cover 94a is removed. In addition to the small size, the following points are very complicated.

  The sheave 96 is attached to a sheave bracket 97 fixed to the tip of the rod 93a using a pin 98 as a support shaft. It is necessary to wind a wire around the sheave 96. However, if the sheave 96 is fixed inside the hydraulic cylinder 93 before being wound inside the cross member 94 before winding the wire, the cross member 94 The interior space is further restricted. It is not preferable to further wind the wire around the sheave 96 already stored in the cross member 94 in this restricted state, because the complexity increases.

  Therefore, instead of fixing the sheave 96 on which the wire is not wound to the hydraulic cylinder 93, the wire is wound on the sheave 96 in advance, and then the sheave 96 is attached to the sheave bracket 97 and the hydraulic cylinder 93 is mounted. Often fixed to.

  At this time, the wire is set in a stretched state in which a predetermined tension is generated, and then the sheave 96 is sandwiched between the two bracket pieces 97a and 97b of the sheave bracket 97. Then, a pin 98 is inserted into the sheave 96 together with the bracket pieces 97a and 97b, and the pin 98 is fastened to be fixed to the sheave bracket 97 so that the sheave 96 rolls stably.

  Such an operation of attaching the sheave 96 must be performed in a narrow cross member 94 in a state where the sheave 96 is pulled by the tension of the wire, and it is difficult to align the sheave 96 with the sheave bracket 97. In addition, the work of fastening the pin 98 becomes complicated.

  The present invention has been made in view of these points, and a cross member is mounted on a pair of left and right posts, and a sheave that rolls in accordance with expansion and contraction of a hydraulic cylinder installed in the cross member is easily installed. It is an object of the present invention to provide a lifting / lowering device for a receiving cradle that can perform the above-mentioned operations.

  In the present invention, the following means are used.

  A pair of left and right posts erected on a vehicle, a cross member erected between the posts, a hydraulic cylinder housed in the cross member with the left-right direction as a longitudinal direction, and a rod tip of the hydraulic cylinder The present invention is directed to a loading tray elevating device including a bracket fixed to the bracket, a sheave engaged with the bracket and around which the cord is wound, and a loading tray that can move up and down along the post.

  The bracket is fixed to the tip of the rod at one end in the left-right direction, and an opening is provided at the other end, and the sheave is substantially horizontal so as to be substantially orthogonal to the left-right direction. A shaft pin portion is provided, the end of which protrudes from the sheave with the direction being the longitudinal direction. It is characterized in that the shaft pin portion has a rotation restricting portion that engages with the bracket and restricts rotation about the longitudinal direction thereof as the axial direction.

Further, the rotation restricting portion is a flat portion provided on at least a part of a peripheral surface of the end portion, and the rotation of the shaft pin portion is performed by engaging the flat portion with an end surface of the opening. A regulated configuration can also be used.
Further, the shaft pin portion may be configured to have a movement restricting portion that restricts movement of the shaft pin portion in a longitudinal direction of the shaft pin portion.
In addition, the opening may be configured to have an elongated hole shape.

  According to the loading tray elevating device of the present invention, the bracket used at the time of mounting the rolling sheave has an opening that opens on the side opposite to the side to which the rod tip is fixed, so the shaft pin portion is provided in advance on the sheave. It can be attached to the bracket after it has been set. Therefore, it can be easily installed even in a small space in the cross member. Further, since the shaft pin portion has the rotation restricting portion for restricting the rotation, only the sheave can be rotated when the hydraulic cylinder expands and contracts, and the sheave can be satisfactorily rolled. Then, even if the expansion and contraction of the hydraulic cylinder is repeated and the rolling of the movable sheave is repeated, the shaft pin portion does not relatively change (posture change) with respect to the bracket. That is, since the opening of the bracket is not worn and deformed by the shaft pin portion, the sheave is always stably held by the bracket.

(A) is a perspective view of the loading / unloading device raising / lowering apparatus which concerns on embodiment of this invention, (b) is a principal part which shows the inside of a post, and is an expression side view. (A) is a schematic rear view of a main part showing the inside of the cross member according to the embodiment of the present invention, and (b) is a schematic top view showing the sheave according to (a). It is a schematic rear view showing the assembling of the sheave and the sheave bracket according to the embodiment of the present invention, and a schematic perspective view showing the assembling. It is a model rear view showing attachment of a sheave and a sheave bracket concerning another embodiment of the present invention. (A) is a principal part perspective view of the loading stand raising / lowering apparatus which concerns on a conventional embodiment, and the principal part perspective view which shows assembly | attachment of the sheave with respect to the hydraulic cylinder which concerns on the same apparatus.

  Hereinafter, an example of an embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 1A, the loading stand lifting device 100 of this embodiment is mounted on the rear of the vehicle, and includes a pair of left and right posts 1, a subpost 2 in the post 1, and a slider in the subpost 2. 3, a load receiving table 4 connected to the slider 3, a cross member 6 extending between the left and right posts 1 behind the load floor 5, and a hydraulic cylinder (not shown) disposed in the cross member 6. ). The cross member 6 is composed of a main body 61 having a U-shaped cross section with an open rear side of the vehicle and a cover 62 covering the opening. The hydraulic cylinder moves in the left-right direction (Y-axis direction) within the main body 61. It is provided as a longitudinal direction, and the receiving table 4 can be moved up and down along the post 1 in the vertical direction (Z-axis direction).

The post 1 includes an upper sheave 11 at an upper position and a position closer to a vehicle front side (left side in the drawing) as shown in FIG. 1B when the port side post is viewed from the outside in the vehicle width direction, and an upper portion of the post 1. And a sheave holding portion 12 that holds the upper sheave 11, a subpost 2 that can move up and down at a position closer to the vehicle rear side (right side in the figure), and a slider 3 that can move up and down inside the subpost 2. Is provided. On the upper surface of the subpost 2, a first roller 13a for the subpost that rolls on the inner surface on the rear side (right side in the figure) of the post 1 is fixed, and on the lower part of the post 1, the outer surface on the front side (left side in the figure) of the subpost 2 Is fixed, and the sub-post 2 can be moved up and down in the post 1 by the two rollers 13a and 13b. A slider first roller 14a that rolls on the inner surface on the rear side (right side in the figure) of the subpost is fixed to the upper part of the slider 3, and the front side of the subpost (left side in the figure) is fixed to the lower part of the slider 3. The second roller 14b for the slider that rolls on the inner surface is fixed. By these two rollers 14a and 14b, the slider 3 can be moved up and down by the subpost 2 in a favorable manner. The cross member 6 is located at an intermediate portion in the height direction of the post 1 as the main body 61 is illustrated.

  The main body 61 of the cross member 6 is provided with side sheaves (left end sheaves are shown in the drawing) 15 at both left and right ends, and a wire wound around the side sheaves 15 is provided. 16 has been pulled up to the upper sheave 11. For convenience of the drawing, only the region from the side sheet to the upper sheave 11 is shown for the wire 16, but one end of the wire 16 is folded down by being wound on the upper sheave 11, so that the slider 3 a of the slider 3 is turned off. It is fixed to. The other end of the wire 16 is wound around the side sheave 15 and drawn in along the longitudinal direction of the cross member 6. The pulled-in wire is pulled to a movable sheave (see FIG. 2) attached to a rod end of a hydraulic cylinder, which will be described later. It is fixed to a fixing part (not shown). Conversely, a wire (not shown) stretched in the post 1 on the starboard side is fixed at one end to a fixing portion (not shown) fixed to the floor surface of the main body 6 a of the cross member 6. Then, it is turned back by the movable sheave in order, is turned back by the side sheave 17 near the post 1 on the port side, and is pulled up to the upper part of the post 1 via the side sheave (not shown) near the post 1 on the starboard side. . Then, it is fixed to the slider 3 in the same manner as the post 1 on the port side. With this configuration, when the rod of the hydraulic cylinder extends, the wire in the post 1 is drawn into the cross member 6 and the slider 3 rises. When the rod contracts, the wire in the cross member 6 is paid out from the post 1 and the slider 3 descends. The loading table 4 is moved up and down as the slider 3 is moved up and down.

  As shown in FIG. 2A, the hydraulic cylinder 8 is provided with a rod 81 capable of extending and contracting in the left-right direction. In addition, regarding the cross member 6 of this figure, the cover part 62 is omitted, and only the main body part 61 is shown, and the above-described wires, the hydraulic tube connected to the hydraulic cylinder, and the like are omitted for convenience of explanation. I have.

  A movable sheave 19 is attached to the distal end of the rod 81 of the hydraulic cylinder 8 via a sheave bracket 18. FIG. 2B is a top view mainly showing the sheave bracket 18 and the movable sheave 19. The sheave bracket 18 is bent in a U-shape with the starboard side (the right side in the figure) opened when viewed from above. A movable sheave 19 is attached between two bracket pieces 18a and 18b having a shape in which the bracket pieces 18a and 18b face each other in the front-rear direction (vertical direction in the figure).

  The length L1 of the bracket pieces 18a, 18b in the left-right direction is larger than the length L2 of the movable sheave 19 in the same direction. In addition, the movable sheave 19 has a shaft pin portion 191 inserted into a portion serving as a rotation axis for each of the two sheaves 19a and 19b. Note that both ends of the shaft pin portion 191 protrude from the sheaves 19a and 19b.

  Next, assembling of the movable sheave 19 into which the shaft pin portion 191 is inserted and the sheave bracket 18 will be described with reference to FIG. In this figure, one of the two bracket pieces 18a and 18b and the two sheaves 19a and 19b will be described focusing on one bracket piece 18b and one sheave 19b on the front side, but the other bracket piece 18a The sheave 19a has the same configuration.

  As shown in FIG. 3A, the bracket piece 18b is provided with an opening 181b that opens on the starboard side (the right side in the figure). The opening 181b is a long hole formed linearly up to the center of the bracket piece 18b with the longitudinal direction being the left-right direction (Y-axis direction). The movable sheave 19 with the wire 16 wound around the bracket piece 18b is moved closer to the port side (Y-axis negative direction side) as shown by the arrow. At this time, a desired tension or a tension close to the desired tension has already occurred in the wire 16. The movable sheave 19 is also in a state where the shaft pin portion 191 is already inserted.

  The movable sheave 19 is inserted so as to be sandwiched between the two bracket pieces 18a and 18b. At this time, of the shaft pin 191, the end protruding from the sheave 19 b (the portion protruding toward the front in the figure) moves from the opening of the opening 181 b to the center of the bracket piece 18 b using the long hole as a guide. Is done. Then, in a state where the shaft pin portion 191 has moved to the port side (Y-axis negative direction side) end of the opening 181b as shown in FIG. 3B, the mounting process of the movable sheave 19 to the sheave bracket 18 is completed. I do.

  As shown in FIG. 3C, the shaft pin portion 191 according to the present embodiment is substantially perpendicular to the opening 181b and is substantially horizontal and is closer to the center in the longitudinal direction (closer to the X-axis negative direction). 1911, and a shaft pin end 1912 adjacent to the shaft main body 1911 near the center in the longitudinal direction (closer to the X-axis positive direction). While the shaft pin body 1911 has a substantially cylindrical shape, the shaft pin end 1912 has the X-axis direction as the longitudinal direction similarly to the shaft pin body 1911, and its peripheral surface is curved with the flat portion 1912a. It has a shape combined with the portion 1912b.

  When attaching the movable sheave 19 to the sheave bracket 18, the shaft pin end 1912 is inserted into the opening 181b. As shown, the height H1 of the shaft pin end 1912 is smaller than the height H2 of the shaft pin body 1911. The height H1 is slightly smaller than or substantially equal to the opening height H3 of the opening 181b. Therefore, when the shaft pin portion 191 is inserted into the opening 181b, the outer peripheral surface (the flat portion 1912a or the curved surface) of the shaft pin end 1912 with respect to the upper surface portion 1811b and the lower surface portion 1812b which are the end surfaces of the opening 181b. The part 1912b) is slid. That is, the upper surface portion 1811b and the lower surface portion 1812b function as guides for the shaft pin end 1912.

  When the shaft pin portion 191 is inserted into the opening 181b, the height H1 of the shaft pin end 1912 is slightly smaller or substantially the same as the opening height H3, so that the shaft pin portion 191 extends in the longitudinal direction (X-axis direction). The flat portion 1912a comes into contact with the upper surface portion 1811b even when a rotational force about the axis is applied, thereby restricting the rotation of the shaft pin portion 191. That is, the flat portion 1912a engages with the sheave bracket 18, and more specifically, functions as a rotation restricting portion that restricts rotation of the shaft pin portion 191 by engaging with the end surface (upper surface portion 1811b or lower surface portion 1812b) of the opening 181b. I do. Therefore, even if the hydraulic cylinder 8 is repeatedly expanded and contracted and the movable sheave 19 rolls repeatedly, the shaft pin portion 191 can maintain the same posture with respect to the sheave bracket 18. That is, since the shaft pin portion 191 is kept immovable relative to the sheave bracket 18, there is no abrasion between the shaft pin portion 191 and the opening 181 b of the sheave bracket 18. Therefore, the secular change of the movable sheave 19 and the sheave bracket 18 is also suppressed, which contributes to the stable rolling of the movable sheave 19 and also contributes to the excellent drawing and drawing of the wire 16. It is also useful for maintenance of the movable sheave 19 and the sheave bracket 18.

  The shaft pin portion 191 further has a height higher than the shaft pin end portion 1912 (H2> H1), and a wall surface portion 1911a perpendicularly intersecting with the plane portion 1912a is formed by the shaft pin body portion 1911. It has at the end. The shaft pin main body portion 1911 is a portion that enters between the two bracket pieces 18a and 18b. When the shaft pin portion 191 is inserted into the opening 181b, the wall portion 1911a is connected to the bracket piece 18b. The inner surface of the sheave bracket 18 (the surface of the bracket piece 18b facing the other bracket piece 18a) 182b is brought into close or abutting state. Therefore, the wall portion 1911a serves as a movement restricting portion that restricts the movement of the shaft pin portion in the longitudinal direction (X-axis direction), thereby preventing the movable sheave 19 from rattling. In other words, the shaft pin body 1911 and the shaft pin end 1912 having the shapes described above not only restrict the rotation of the shaft pin 191 but also restrict the movement in the longitudinal direction. Contribute to rolling.

  Further, since the movable sheave 19 having the shaft pin portion 191 and the sheave bracket 18 having the opening 181b according to the present embodiment are used, even if the wire in which the desired tension is generated is kept wound, The movable sheave 19 can be easily assembled to the sheave bracket 18 in the simple cross member 6. Further, in addition to restricting the rotation of the shaft pin portion 191 based on the shaft pin portion 191 having the above-described shape and restricting the movement of the movable sheave 19 in the longitudinal direction of the shaft pin portion 19, the movable sheave 19 is moved by the tension of the wire 16 so that the hydraulic cylinder Since the movable sheave 19 is pulled to the side (the Y-axis negative direction side), it is possible to prevent the movable sheave 19 from moving to the opening side (the Y-axis positive direction side) of the opening 181b. That is, since the movable sheave 191 can be held at substantially the same position as the desired position assembled to the sheave bracket 18, a fixing member (such as a bolt and a nut) for fixing the movable sheave 19 to the shaft pin portion 191 can be provided. No need to provide. For this reason, it is also possible to omit an operation in which a worker puts his hand in the narrow space of the cross member 6 and performs a fastening operation of the minute fixing member.

  The shaft pin portion 191 having such an effect may have a shape having a plurality of flat portions 1912a at the shaft pin end 1912. Further, in the longitudinal direction (X-axis direction) of the shaft pin end portion 1912, only a part of the shaft pin end portion 1912 has a concave portion in which the flat portion 1912a is provided, and has a shape that abuts not only on the inner surface but also on the outer surface of the sheave bracket 18. The shaft pin end 1912 may be used. Although the height H1 of the shaft pin end 1912 is relatively smaller than the opening height H3, when the shaft pin 191 rotates, the edge of the flat portion 1912a is caught on the upper surface portion 1811b or the lower surface portion 1812b ( (Engagement) and may be shaped to restrict its rotation.

  Further, as shown in FIG. 4A, the movable sheave 29 is provided with a shaft pin 291 having a rectangular cross section, and the opening 281b is slightly larger than or approximately the same as the height of the shaft pin 291. It may have a height. Even with such a movable sheave 29 and the opening 281b, the same effect can be obtained.

  Further, instead of the shaft pin portions 191 and 291 having at least partly the planar shape as described above, the shaft pin portion 391 as shown in FIG. . However, the shaft pin portion 391 has a concave portion 391a on a part of its peripheral surface, and can be inserted into the concave portion 391a on the inner peripheral surface of the opening 381b, or is slightly smaller than the concave portion 391a. A projection 3811b of substantially the same size is provided. By inserting the convex portion 3811b into the concave portion 391a, the rotation of the shaft pin portion 391 is regulated. That is, the same effects as those of the movable sheaves 19 and 29 described above can be obtained.

  Although not shown, assembling of the movable sheaves 19, 29, and 39 with the sheave brackets 18, 28, and 38, a hydraulic drive device (power unit) installed outside the cross member 6 is used as a drive source to drive the cross This is a loading table elevating device 100 in which the hydraulic cylinder 8 installed in the member 6 expands and contracts. However, the present invention is not limited to the configuration in which the hydraulic drive device is installed outside the cross member 6, and a similar effect can be obtained even with a loading tray elevating device in which the hydraulic drive device is installed in the cross member 6. Applicable because it can.

  In addition, although the expansion and contraction force of the hydraulic cylinder 8 is transmitted to the slider 3 via the wire 16, the invention is not limited to the wire 16, but may be a configuration using another cord-like body such as a chain.

  The present invention is directed to an apparatus for lifting and lowering all receiving pallets in which a pair of left and right posts are erected and a cross member is erected between the posts, and a hydraulic cylinder installed in the cross member is used for lifting and lowering the receiving cradle. Useful for

REFERENCE SIGNS LIST 100 loading tray lifting device 1 post 2 subpost 3 slider 4 loading tray 5 loading platform floor 6 cross member 11 upper sheave 12 sheave holding portion 16 wire 18 sheave bracket 19 movable sheave 18 a, 18 b bracket piece 181 b opening 191 shaft pin portion 1911 shaft Pin body 1912 Shaft pin end 1911a Wall surface (movement restricting part)
1912a Flat part (rotation restriction part)

Claims (4)

A pair of left and right posts erected on the vehicle, a cross member erected between the posts, a hydraulic cylinder housed in the cross member with the left-right direction as a telescopic direction, and a rod tip of the hydraulic cylinder A bracket fixed to the bracket, a sheave engaged with the bracket and around which the cord-like body is wound, and a load receiving cradle that can move up and down along the post,
The bracket is fixed to the rod tip at one end in the left-right direction, and an opening is provided at the other end.
The sheave that rolls in the left-right direction along with the expansion and contraction of the hydraulic cylinder in the cross member has an end protruding from the sheave with a substantially horizontal direction as a longitudinal direction so as to be substantially orthogonal to the left-right direction. A shaft pin part is provided,
In the shaft pin portion, a flat portion is provided on at least a part of the peripheral surface of the end portion, and the flat portion is engaged with the end surface of the opening, so that the longitudinal direction is the axial direction. A loading tray raising / lowering device characterized in that rotation is restricted. The height of the part of the said axis pin part in which the said flat part is provided is substantially the same as the height of the said opening part. The loading stand raising / lowering apparatus of Claim 1 characterized by the above-mentioned. The load receiving platform elevating device according to claim 1, wherein the shaft pin portion has a movement restricting portion that restricts movement of the shaft pin portion in a longitudinal direction of the shaft pin portion. The lifting device according to claim 1, wherein the opening has an elongated shape.

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