JP3833675B2 - Maximum lift positioning device for load receiving platform in load receiving platform lifting device - Google Patents

Description

  The present invention relates to a highest ascending positioning device for positioning a cargo receiving base at a highest ascent position in a cargo receiving base lifting device.

  Conventionally, a slider is provided in a pair of left and right columns that are erected on a cargo box of a vehicle, and a wire connected to the slider is extended into the column or retracted from the column by an expansion / contraction operation of the expansion / contraction cylinder. There is provided a load receiving table elevating device in which a load receiving table supported by the slider is moved up and down along the column so that the load receiving table can be moved up and down along the column.

  And in the load receiving platform lifting device that lifts and lowers the load receiving table along such a support column, the highest lift positioning device that forcibly stops the lifting of the load receiving table at the highest lift position where the load receiving table is substantially flush with the load receiving platform. Is provided.

  As this highest rise positioning device, for example, a stopper bracket is provided at the upper part of the column and a stopper bolt is provided at the upper end of the slider. When the slider is raised to the highest position, the stopper bolt of the slider is attached to the stopper bracket. By contacting, the load receiving platform is stopped at the highest position via the slider (see, for example, Patent Document 1).

  Further, as shown in FIG. 8, when the slider a is raised to the highest position, the bracket b is provided in the bracket b that protrudes rearward from the slider a through the groove b1 formed on the rear surface of the pillar b. In some cases, the stopper d provided in the bracket c is stopped at the highest position by contacting the stopper d.

A sheave g for guiding the wire f connected to the slider a into the support column b is provided at the upper portion of the support column b. The sheave g is attached to the upper side surface of the support column b so as to be detachable. Is supported rotatably.
JP 2002-1114080 A

  However, in the case where the mounting bracket h for supporting the sheave g and the stopper d are separately provided on the support b as in the conventional case, the slider a comes into contact with the stopper d at the highest position so that the slider a When stopping, assuming that the tensile force of the wire f is F, the attachment plate h has a structure in which a force of 2F is applied downward by the wire f sandwiching the sheave g.

  The present invention aims to reduce the load acting on the mounting plate provided with the sheave when the slider comes into contact with the stopper at the highest position and stops, thereby improving the durability of each member and the structure. It is an object of the present invention to provide a maximum receiving position positioning device for a load receiving platform in a load receiving table lifting / lowering device that can be simplified.

In order to achieve the above object, the highest rise positioning device for the load receiving platform in the load receiving platform lifting device of the invention according to claim 1 is provided with a slider in a pair of left and right support columns erected on the cargo box of the vehicle, The wire connected to the slider is moved up and down along the column by extending or retracting the wire connected to the slider by the expansion / contraction operation of the expansion / contraction cylinder, whereby the load receiving table supported by the slider moves along the column. In the load receiving platform lifting device in which the load receiving platform can be positioned at the highest lifted position by preventing the slider from rising by contact with the slider by the highest lift positioning device.
A mounting plate that rotatably supports a sheave for guiding the wire is provided on the upper portion of the support column, and the highest-positioning device is provided on the mounting plate.

  According to a second aspect of the present invention, there is provided the highest lift positioning device for the load receiving platform, wherein the highest lift positioning device includes a holding member provided on a mounting plate and an upper end portion of the slider. And an abutting member that abuts.

  According to the present invention, when the slider comes into contact with the contact member at the highest position to stop the slider, the load acting on the mounting plate provided with the sheave can be reduced. It is possible to suppress the damage of each member due to the impact accompanying the stop of the contact of the slider, to improve the durability, and to reduce the generation of noise.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 shows a load receiving table lifting device.

  The load receiving platform lifting / lowering device 1 includes a pair of left and right support columns 3 erected at the rear end of a cargo box 2 of a vehicle, sliders 4 (see FIG. 2) inserted into the support columns 3 so as to be movable up and down, and left and right It is comprised from the load receiving stand 5 supported by the lower end part of the slider 4, and the raising / lowering cylinder 7 connected with each slider 4 via the wire 6, respectively.

  Specifically, the support column 3 is formed of a hollow long body having a rectangular cross section, and the slider 4 is disposed therein. As shown in FIG. 2, the slider 4 is provided with elevating rollers 41 at the upper end portion and the middle portion thereof, and the elevating and lowering movement of the slider 4 is smoothly performed by these elevating rollers 41.

  One end of each wire 6 is fixed to the upper end of the left and right sliders 4. The wire 6 is guided upward from the slider 4, folded downward by a sheave 31 provided on the upper portion of the support column 3, guided downward on the front side, and then sheaveed from the lower portion of the support column 3 (not shown). And the other end is appropriately fixed.

  As shown in FIG. 1, the elevating cylinder 7 is disposed at the front portion in the cross member 8 disposed between the support columns 3, and the wire 6 disposed as described above is extended and retracted by the elevating cylinder 7. The slider 4 is moved up and down by being drawn into the column 3 or pulled in from the column 3.

  The load receiving platform 5 is supported by a horizontal shaft 51 on the left and right brackets 42 projecting rearward from the lower end of each slider 4, and has an upright position (stored state) standing up along the column 3. It can be placed in a horizontal position (working state). A notch groove 33 (see FIG. 1) is formed in the rear wall 32 of the support column 3 in the vertical direction, and the left and right brackets 42 are disposed so as to protrude rearward from the support column 3 through the notch groove 33.

  Therefore, as described above, when the slider 4 is moved up and down by the lifting cylinder 7, the load receiving platform 5 connected to the slider 4 is kept in a horizontal state and moved up and down between the ground and the floor surface of the packing box 2. Can be made.

  By the way, in the load receiving platform lifting / lowering device 1 configured as described above, as shown in FIG. 2, when the load receiving platform 5 reaches the highest lift position, the highest lift for forcibly stopping the lifting of the load receiving platform 5 is performed. A positioning device 10 is provided.

  As shown in FIGS. 3 to 5, the most elevated positioning device 10 includes an attachment plate 11 that is detachably attached to the upper portion of the column 3, a holding member 12 provided on the attachment plate 11, and a holding member 12. A contact bolt 15 (see FIG. 2) is provided as a contact member that is screwed so that the amount of protrusion in the vertical direction can be adjusted.

  As shown in FIG. 2, the mounting plate 11 is a flat plate formed in a rectangular shape corresponding to the front-rear width of the support column 3, and has four corners so as to close the opening 3a formed on the upper outer surface of the support column 3. Are detachably attached by screw tightening 11a.

  As described above, the holding member 12 is disposed on the inner surface of the mounting plate 11 facing the support 3 when the mounting plate 11 is mounted on the support 3 via the connecting member 14. And the holding member 12 is comprised with the nut member by which the screw hole was penetrated and formed.

  As shown in FIG. 6, the contact bolt 15 is provided with a contact portion 17 on the head 16 a of the bolt member 16, and the screw rod portion 16 b of the bolt member 16 is screwed into the screw hole of the holding member 12. It has been made possible. Accordingly, the abutting portion 17 is disposed on the holding member 12 in a state where the abutting portion 17 protrudes downward from the holding member 12 by screwing a predetermined amount of the screw rod portion 16b from below and fixing with the nut 15a. (See FIG. 2).

  Since the contact bolt 15 is screwed into the holding member 12 in this way, the length of the contact portion 17 protruding from the holding member 12 can be made variable by adjusting the screwing amount.

  The abutting portion 17 is a portion that abuts against the upper end portion of the slider 4 when the mounting plate 11 is attached to the support column 3, and an elastic member 17a such as a rubber as a buffer member is interposed between the head 16a via the support member 17b. It is screwed to.

  Further, the connecting member 14 of the mounting plate 11 is provided at a portion for rotatably supporting the sheave 31 in addition to attaching the holding member 12. Specifically, the connecting member 14 has two plate portions 14a and 14b parallel to the mounting plate 11 as shown in FIG. 5, and the sheave 31 is disposed between the plate portions 14a and 14b. The sheave 31 is rotatably supported by support pins 31a (see FIG. 2) inserted into through holes 14c and 11b formed in a straight line on the plate portions 14a and 14b and the mounting plate 11, respectively.

  The most elevated positioning device 10 described above is provided on the left support column 3 in FIG. 1, and the right support column 3 is basically similar to the most elevated positioning device 10 and is configured symmetrically. A most elevated positioning device (not shown) is provided.

  Next, the positioning of the load receiving platform 5 at the most elevated position by the most elevated positioning device 10 configured as described above will be described.

  First, when the load receiving platform 5 rises to a predetermined height due to the rise of the slider 4, the upper end portion of the slider 4 comes into contact with the contact portion 17 of the contact bolt 15, and the load receiving platform 5 is forced through the slider 4 at this position. Thus, the highest lift position of the load receiving platform 5 is determined by stopping the lift.

  Further, by adjusting the screwing amount of the contact bolt 15 with respect to the holding member 12, that is, the vertical position of the contact portion 17 of the contact bolt 15 protruding downward from the holding member 12, the slider 4 contacts within the range. The height position can be adjusted, whereby the highest lift position of the load receiving platform 5 can be adjusted.

  By the way, as described above, the contact bolt 15 for positioning the load receiving platform 5 at the highest position by contacting the upper end of the slider 4 is provided integrally with the mounting plate 11 via the holding member 12 and the connecting member 14. In addition, the mounting plate 11 is also provided with a sheave 31 around which the wire 6 is wound.

  For this reason, when the slider 4 comes into contact with the contact portion 17 of the contact bolt 15 and stops the slider 4 at the highest position, when the tensile force of the wire 6 is F as shown in FIG. The rear wire 6a that hangs down from the sheave 31 toward the slider 4 and is connected to the slider 4 acts so as to counteract the force F generated when the slider 4 comes into contact with the contact bolt 15. Only a force of 1F corresponding to the tensile force of the wire 6 acts on the mounting plate 11.

  That is, the load acting on the mounting plate 11 is halved compared to the conventional structure described above, thereby suppressing damage to each member due to the impact caused by the stoppage of the slider 4 at the highest position. Thus, the durability can be improved and the generation of noise can be reduced. Further, by providing the mounting plate 11 with the sheave 31 and the highest ascending positioning device, the structure can be simplified as compared with the case where the sheave 31 and the highest ascending positioning device are provided separately.

It is a perspective view which shows the schematic structure of the whole cargo receiving stand raising / lowering apparatus. It is a side view which shows the highest rise positioning apparatus attached to the support | pillar. It is a front view which shows an attachment plate and a holding member. It is A arrow directional view in FIG. It is BB sectional drawing in FIG. It is a side view showing a contact bolt. It is the schematic for demonstrating the load which acts on a mounting plate when a slider is stopped in the highest position by contact | abutting with a stopper. It is a side view which shows the conventional highest rise positioning apparatus. It is the schematic for demonstrating the load which acts on a mounting plate when a slider is stopped in the highest position by contact | abutting with the stopper in the past.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Cargo stand raising / lowering device 2 Cargo box 3 Support | pillar 31 Sheave 4 Slider 5 Cargo cradle 6 Wire 10 Uppermost positioning device 11 Mounting plate 12 Holding member 15 Contact bolt (contact member)

Claims (2)

A slider is provided in a pair of left and right columns that are erected on the cargo box of the vehicle, and a wire connected to the slider is extended into the column by the expansion and contraction operation of the expansion cylinder or pulled into the column by the expansion and contraction of the slider. As a result, the load receiving table supported by the slider is provided so as to be able to move up and down along the support column. In the load receiving table lifting device in which the table can be positioned at the highest position,
A mounting plate for rotatably supporting the sheave for guiding the wire is provided at an upper portion of the support column, and the highest lift positioning device is provided on the mounting plate. The highest lift positioning device. The said highest raising positioning apparatus is provided with the holding member provided in the attachment plate, and the contact member which is provided in this holding member and contact | abuts the upper end part of the said slider. The highest lift positioning device for the load receiving platform in the load receiving platform lifting device.

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