JP6539147B2 - Opening and closing assist device for tilt plate - Google Patents

Description

  BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an auxiliary device for opening and closing a pivot plate.

  Conventionally, in the cargo bed of a lorry, a movable side plate lift plate is rotatably provided between a closed position in an upright state and an open position in a suspended state by a hinge at a lower end position. The tilting plate has a large opening moment by its own weight, and requires a large force for opening and closing operations. Therefore, an open / close assist device is provided to apply a closing moment to the tilt plate.

  An example of such an open / close assist device for the tilt plate is shown in FIG. That is, the base 100 provided under the loading platform K of the lorry, the arm mechanism 101 whose upper end is connected to the side of the tilting plate S on the front side of the base 100, the pulling member 102 and the spring 103 on the rear side of the base 100. And a transmission mechanism 105 for connecting the traction member 102 and the rear end of the arm mechanism 101 to transmit the traction force. The transmission mechanism 105 is constituted by a chain or the like, and is hung on a fixed pulley 106 fixed to the base 100 (see, for example, Patent Document 1).

  Patent Document 1 mentioned above is a technology for changing the direction of the elastic force of a spring by a constant pulley to obtain a closing moment. By the way, in order to lift a heavy load, it is known that it is better to use a moving pulley that can exert a large force with a small force. For example, the use of a simple moving pulley can exert twice as much force as that of a fixed pulley alone. Patent Document 1 described above is a technology that does not use a moving pulley, so it is difficult to obtain the necessary and sufficient elastic force of the spring in the initial stage of transition of the tilt plate from the closed state to the open state. In addition, in order to sufficiently secure the elastic force of the spring, for example, a linear thick spring is used, or the angle of the arm mechanism is limited.

  An example of an open / close assist device using a moving pulley is shown in FIG. The opening / closing assist device is installed in a support 110 having a hollow portion of a frame provided in the front-rear direction (traveling direction) of the wing-type side opening / closing load carriage.

  That is, a coil spring 111 which expands and contracts in the vertical direction is provided at the upper portion in the hollow portion of the support 110, and the moving pulley 112 is suspended at a position directly below the coil spring 111 (see, for example, Patent Document 2). A wire 114 connected to the tip of an eyebolt 113 provided at the lower part of the column is hung on a moving pulley 112 and connected to the tilt plate S via a guide pulley 115. Therefore, when the tilt plate S is opened and closed, an elastic force acts on the coil spring 111 connected to the moving pulley 112 by the wire 114. At this time, the moving pulley 112 moves downward with the extension of the coil spring 111.

JP 2008-87690A Japanese Utility Model Application Publication No. 4-38888

  The opening / closing assist device of Patent Document 2 described above has a configuration in which the moving pulley 112 is suspended at a position directly below the coil spring 111. Therefore, the stroke of the coil spring 111 is about half of the amount of movement of the wire 114 accompanying the opening of the tilting plate S. That is, by using the moving pulley 112, the action of the elastic force of the spring is halved. In order to secure a sufficient elastic force of the spring, it is necessary to use a thick and heavy spring with a wire diameter, etc., so the device becomes heavy and there is a problem that the apparatus becomes large.

  From the above point of view, with the conventional swinging door open / close assist device, it has not been possible to realize the reduction in weight and size of the device by maximizing the elastic force of the spring.

  One object of the present invention is to provide an open / close assisting device for a pivot plate which exerts the maximum elastic force of a spring to realize a reduction in the weight and size of the device.

The above task is
A base fixed under a loading platform having a tilt plate, an arm mechanism provided on the front side of the base, a traction force generation mechanism provided on the rear side of the base, and a traction force generated in the traction force generation mechanism An open / close assist device for an elevator plate having a traction force transmission mechanism for transmitting to the mechanism,
The arm mechanism is
The base is configured to rotatably connect a rear end of the rotary arm, a front end of the rotary arm to a lower end of the side link, and an upper end of the side link to a mounting member fixed to the pivot plate.
The traction force generation mechanism is provided on the rear side of the base body,
The traction force transmission mechanism is sequentially hooked on a fixed pulley whose rear end is connected to the traction force generation mechanism and a middle part is fixed to the base, and a moving pulley provided on the rotating arm, and its tip is connected to the base It can be solved by the opening / closing auxiliary device of the pivot board characterized by being.

  According to the present invention, it is possible to provide an open / close assisting device for a pivot plate which exerts the elastic force of a spring to the maximum and realizes weight reduction and miniaturization of the device.

BRIEF DESCRIPTION OF THE DRAWINGS It is a whole perspective view which shows an example of use condition of the opening-and-closing auxiliary | assistance apparatus of the pivot board which concerns on the 1st Embodiment of this invention. It is a partially transparent perspective view which shows an example of use condition of the opening / closing auxiliary | assistance apparatus of the pivot board which concerns on the 1st Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a partial vertical side view of the opening / closing assistance apparatus of the pivot board which concerns on the 1st Embodiment of this invention. It is a front view of the opening / closing assistance device of the pivot board which concerns on the 1st Embodiment of this invention. It is a partial longitudinal cross-sectional view which shows the operation state at the time of open | release of the elevator board of the opening-closing | switching auxiliary device of the elevator board concerning 1st Embodiment of this invention. It is a partial longitudinal cross-sectional view of the opening / closing assistance apparatus of the pivot board which concerns on the 2nd Embodiment of this invention. It is a partial vertical side view of the opening / closing assistance apparatus of the conventional pivot board. It is a partial vertical side view of the opening / closing assistance apparatus of the conventional pivot board.

  Next, an embodiment of an auxiliary device for opening and closing a pivot plate according to the present invention will be described. In the drawings, the same or corresponding parts are denoted by the same reference numerals, and the redundant description thereof is appropriately simplified or omitted. The drawings are not intended to indicate relative ratios between members or parts. Accordingly, specific dimensions can be determined by one of ordinary skill in the art in light of the following non-limiting embodiments.

  Incidentally, the "front side" described in the claims or the specification refers to the attachment side of the tilt plate in the swing opening / closing auxiliary device 1, and the "rear side" is a bias in the swing opening / closing auxiliary device 1 of the tilt plate. It indicates the means side (corresponding to the helical spring 41).

First Embodiment
FIG. 1 is an overall perspective view showing an example of a usage state of an opening / closing assist device 1 for an elevator plate according to a first embodiment of the present invention. FIG. 2 is a partially transparent perspective view showing an example of a usage state of the opening / closing assist device 1 for the pivot plate according to the first embodiment of the present invention. In FIG. 2, the transmission part is only the part necessary for the explanation of the switching support device 1 of the present embodiment in relation to the drawing. FIG. 3 is a partial vertical cross-sectional side view of the pivoting door open / close assist device 1 according to the first embodiment of the present invention. FIG. 3 partially shows the inside by a solid line for the sake of explanation. FIG. 4 is a front view of an opening / closing assist device 1 for the pivot plate according to the first embodiment of the present invention. FIGS. 1 to 4 show the opening / closing auxiliary device 1 in the closed state (upright state) of the tilt plate K2.

  The swinging opening / closing assisting device 1 (hereinafter, also referred to simply as the opening / closing assisting device 1) has a base 2 disposed at a lower position of a loading platform K having a lift plate K2 of a lorry. The cargo platform K of the lorry has a substrate K1 on which a load is placed, an elevator plate K2, and a frame portion K3 made of a channel material provided at the outer peripheral edge of the lower surface of the substrate K1.

  The tilting plate K2 is a movable side plate, and is rotatably provided between the closed position in the upright state and the open position in the suspended state by the hinge 6. The hinge 6 is provided in such a manner as to straddle the pivot plate K2 and the frame portion K3.

  The base 2 includes an arm mechanism 3 provided on the front side (arrow X1 side), a traction force generation mechanism 4 provided on the rear side (arrow X2 side) of the base 2, and a traction mechanism generated in the traction force generation mechanism 4 And a traction force transmission mechanism 5 for transmission to the vehicle.

  The base 2 has two side plates 21 standing parallel to each other at a constant interval, and an upper plate 22 connected to the upper end of the side plate 21 (see FIGS. 2 and 4). The two side plates 21 are provided in a manner of hanging from a substantially central position of the lower end face of the upper plate 22, and the entire base 2 has a T-shaped front view. The distance between the two side plates 21 is such that the rotation arm portion 31 described later can be included. A connection piece 23 having a bolt hole bent downward in the orthogonal direction from the upper plate 22 is attached to the front edge (arrow X1 side) end edge of the upper plate 22. The connection piece 23 is joined to the back surface of the frame portion K3 by a bolt.

(Arm mechanism)
The arm mechanism 3 has a rotary arm 31 whose rear end is connected to the left and right side plates 21 of the base body 2, a side link 32 connected to the front side of the rotary arm 31, and a tilt plate at the upper end of the side link 32. And a mounting member 33 fixed to K2.

  The rotating arm portion 31 includes left and right side plates 310 and a connecting plate 311 connecting the side plates 310 to each other, and the connecting plate 311 connects front side (arrow X1 side) edges of the left and right side plates 310 to each other.

  The rear end of the rotating arm portion 31 is rotatably attached to the left and right side plates 21 of the base 2 by a shaft 34. The shaft 34 penetrates the left and right side plates 21 in the horizontal direction. The shaft 34 at the rear end of the rotating arm portion 31 is located at the front lower end portion (arrow X1 side and Z2 side) of the side plate 21 (see FIG. 3). The lower end of the side link portion 32 is rotatably connected by a shaft 35 at the front end (arrow X1 side) of the rotating arm portion 31. In addition, the rotating arm portion 31 has the moving pulley 55 rotatably attached to the left and right side plates 310 by means of a shaft 56, which will be described later. The shaft 56 passes through the left and right side plates 310 in the horizontal direction.

  The side link portion 32 is provided with two rail portions 320 extending in the vertical direction (the direction of the arrow Z1-Z2). The lower end portion of the rail portion 320 interposes the left and right side plates 310 of the rotating arm portion 31 between the left and right rail portions 320, and the lower end of the rail portion 320 and the upper end of the side plate 310 are penetrated by the shaft 35 Are connected rotatably. The upper end of the side link portion 32 rotatably connects the mounting member 33 by a shaft 36.

  The mounting member 33 is bolted to the tilt plate K2. The mounting member 33 can open the tilting plate K2 from the standing position shown in FIG. 3 to the hanging position (see FIG. 5B) through the horizontal position (see FIG. 5A) by the rotation of the shaft 36. Further, when the tilt plate K2 moves from the standing position to the open position, the rotary arm portion 31 is rotated downward about the shaft 34 at the rear end. Incidentally, the positions and the number of bolt joints shown in the figure can be arbitrarily changed. Moreover, although the axis | shafts 34, 35, and 36 of the example of illustration are made into a penetration axis | shaft, it may not be this limitation and may be provided by non-penetration.

(Traction force generation mechanism)
The traction force generation mechanism 4 fixes a cylindrical spring cover 25 to the rear plate 24 provided on the rear side (arrow X2 side) of the base 2 along the front-rear direction (arrow X1-X2 direction). The spring cover 25 has the biasing means 41 concentrically inserted therein. Although the helical spring is used in the present embodiment, the biasing means 41 is not limited to this, and a commonly usable biasing means can be applied (hereinafter referred to as the helical spring 41). The helical spring 41 is disposed along the front-rear direction. The helical spring 41 has a rod-shaped pulling member 42 concentrically inserted therein. The pulling member 42 is disposed parallel to the axis of the helical spring 41. The pulling member 42 penetrates the spring receiving portion 43 and screws a nut 44 to a screw shaft on the rear end side, and the disk shaped spring receiving portion 43 is concentrically attached. A helical spring 41 is disposed between the spring receiving portion 43 and the left and right rear plates 24 of the base 2. Since the mounting position of the spring receiving portion 43 can be moved along the pulling member 42 by the rotation of the nut 44, the preload of the helical spring 41 can be freely adjusted. When the pulling member 42 is moved forward, the spring receiving portion 43 is also moved forward to compress the spiral spring 41, and the elastic force of the spiral spring 41 generates a pulling force that pulls the pulling member 42 backward. Incidentally, the left and right rear plates 24 of the base 2 extend outward (in the arrow Y1 direction and the arrow Y2 direction) from the rear ends of the left and right side plates 21 (see FIGS. 2 and 4). A space between the rear ends of the left and right side plates 21 passes through a cord member 54 connected to the tip of the pulling member 42 described later.

(Traction force transmission mechanism)
The traction force transmission mechanism 5 has a fixed pulley 51 rotatably attached to the left and right side plates 21 of the base 2 by a shaft 52. Further, support pins 53 are attached to the left and right side plates 21 of the base 2. The fixed pulley 51 and the support pin 53 are disposed between the left and right side plates 21 and pass through the left and right side plates 21 in the horizontal direction.

  The fixed pulley 51 has a cord member 54 on its upper surface. The rope member 54 is rotatably connected to the front end of the pulling member 42 by inserting the rear end into the helical spring 41. Further, the middle portion of the cord member 54 is first hung on the upper surface of the fixed pulley 51 and then hung on a moving pulley 55 provided on the rotating arm portion 31. The moving pulley 55 is rotatably attached to the left and right side plates 310 of the rotating arm portion 31 by a shaft 56.

  The tip end of the cord member 54 is connected and fixed to the support pin 53 so as to be folded back with respect to the middle part of the cord member 54. The stroke of the cord members 54 is larger than that of the conventional transmission mechanism 105 (chain) shown, for example, in FIG. Therefore, even if the same degree of spring is used as compared with the configuration by the constant pulley of FIG. 7, a larger elastic force can be obtained from the helical spring 41 because a larger pulling force can be transmitted to the helical spring 41. Further, the cord members 54 may be connected to the outside of the pulling member 42, the spring receiving portion 43, and the helical spring 41 (arrow X1 side).

  When the tilt plate K2 is released, the rotary arm portion 31 rotates downward about the shaft 34 (see FIGS. 5A and 5B). At this time, the moving pulley 55 moves downward (in the direction of the arrow Z2) as the rotating arm 31 rotates, whereby the front portion of the fixed pulley 51 of the cord member 54 is advanced while being lowered, and the cord The rear portion of the fixed pulley 51 of the member 54 advances, and a traction force is generated in the traction force generating mechanism 4 as the traction member 42 advances.

  Incidentally, the center of the cord member 54 placed on the upper surface of the fixed pulley 51 is configured to coincide with the axial center of the helical spring 41. The rear portion of the fixed pulley 51 of the cord member 54 is arranged concentrically with the pulling member 42 and the helical spring 41 and arranged parallel to the axis of the helical spring 41. Then, the compression of the helical spring 41 is performed linearly, which makes it possible to reduce the friction noise at the time of operation.

  In the attachment of the opening / closing auxiliary device 1 of the above-mentioned configuration, the front side surface (arrow X1 side) of the connecting piece 23 of the base 2 is brought into contact with the back surface of the frame portion K3 and is connected by a bolt inserted from the surface side of the frame portion K3. Further, the mounting member 33 of the arm mechanism 3 is attached to the loading platform K by bolting to the tilt plate K2.

  The line member 54 in the illustrated example is a string-like member such as a wire rope, a band-like member such as a belt, or a chain-like member such as a chain. By using the cord members 54 of the cord-like body as the constituent requirements of the traction transfer mechanism 5, a fixed pulley or a moving pulley can be used. Then, the direction of the elastic force can be changed, and the position and angle of the helical spring 41 can be freely arranged. In particular, when the helical spring 41 and the pulling member 42 are disposed on the rear side of the base 2 in a position parallel to the longitudinal direction (arrow Y1-Y2 direction) of the tilt plate K2, the device is in the front-rear direction (arrow X1-X2 direction). Miniaturization can be realized. A space is limited because a plurality of additional devices such as side bumpers, fuel tanks, air tanks, etc. are arranged at the lower position of the loading platform K where the opening / closing auxiliary device 1 is installed. Therefore, if miniaturization can be realized, the degree of freedom of arrangement is improved, and it is possible to prevent hindrance to the arrangement of additional equipment. The cord members 54 also have the advantage of being relatively inexpensive and lightweight.

  Further, the opening / closing assist device 1 of the present embodiment is configured to amplify the elastic force of the helical spring 41 by the moving pulley 55 that moves with the opening operation of the tilt plate K2. Further, the cord member 54 connected to the pulling member 42 for pulling the helical spring 41 at the rear end is hung on the fixed pulley and then folded back by the moving pulley 55 so that the tip is fixed to the support pin 53 is there. Therefore, the stroke for pulling the helical spring can be made larger than that of the transmission mechanism 105 (chain) of the device of FIG. When using the same degree of helical spring, about twice the elastic force (closing moment) can be obtained as compared with the device of FIG. In addition, when the elastic force of the same degree of spring is required, applying the configuration of the present embodiment makes it possible to use a light spring with a thin wire diameter, which can contribute to downsizing and weight reduction of the device.

  Further, since the opening / closing assist device 1 of the present embodiment has a simple mounting structure and no particular limitation on the mounting position, it can be implemented over the entire cargo bed of a general lorry (truck), and its versatility is very high. Incidentally, in the present embodiment, the cord members 54 are shown to be connected to the pulling member 42, but the present invention is not limited to this. The cord members 54 can be implemented by being directly connected to the helical spring 41 (biasing means), and the traction member 42 is not an essential requirement.

(Operation)
Next, the operation of the switching assist device 1 will be briefly described based on FIG. 3 and FIG. In particular, the operation of the opening / closing auxiliary device 1 when the tilting plate K2 moves from the closed state to the open state will be described. FIG. 5A shows an aspect of the switching support device 1 in the horizontal state of the pivoting plate, and FIG. 5B shows an aspect of the switching support device 1 in the open state of the pivoting plate. FIG. 5 shows the inside by a solid line for the sake of explanation.

  By rotating the mounting member 33 about the shaft 36 from the closed state of the tilt plate K2 shown in FIG. 3, the tilt plate K2 is moved to the horizontal state shown in FIG. 5A. At the time of movement, the moving pulley 55 also moves downward as the rotating arm portion 31 rotates downward with the shaft 34 as a fulcrum. Then, the cord member 54 advances to the front side by the movement of the movable pulley 55, and the traction member 42 also follows and advances, whereby a traction force is generated in the traction force generation mechanism 4 and a closing moment starts to act. At this time, when compared with the closing moment of the spring of the same degree using the fixed pulley, the closing moment of about twice acts.

  When the tilt plate K2 moves from the horizontal state of FIG. 5A to the open state shown in FIG. 5B, the rotary arm portion 31 further rotates downward, and the moving pulley 55 also moves further downward. At this time, in the traction force generation mechanism 4, a traction force that is in balance with the opening moment is generated.

  During the opening and closing of the tilting plate K2, the opening moment acts while the pulling force generated in the pulling force generating mechanism 4 tries to rotate the rotating arm 31 upward about the rear end shaft 34. It becomes a moment and the closing moment acts.

Second Embodiment
The swing plate open / close assist device 1 according to the first embodiment is configured to use the cord member 54 of a string-like body and the moving pulley 55 as the traction force transfer mechanism 5, so the longitudinal direction of the device (arrow X 1 As described above, it can contribute to the miniaturization of the (X2 direction). However, the opening and closing assist device 1 ′ of the second embodiment can be miniaturized also in the vertical direction (arrow Z1-Z2 direction) of the device. The points will be described below.

  The fixed pulley 51 and the moving pulley 55 have an advantage that their mounting positions can be freely changed to some extent. FIG. 6 is a partially longitudinal sectional side view showing an opening / closing assist device for the pivot plate according to the second embodiment of the present invention. FIG. 6 shows the inside by a solid line for the sake of explanation. Further, FIG. 6 shows an example in which the position of the moving pulley 55 shown in FIG. 3 is moved upward to realize downsizing in the vertical direction. The dotted lines in the drawing indicate the rotary arm portion 31, the moving pulley 55 and the side plate 21 shown in FIG.

  The moving pulley 55 'of the present embodiment is attached to the rotating arm 31'. In order to move the position of the moving pulley 55 'upward, in the present embodiment, the axis 34 of the rotating arm 31 shown in FIG. 3 is changed to the position of the axis 34'. Further, the position of the fixed pulley 51 of FIG. 3 was changed to the position of the fixed pulley 51 'so as to balance with the changed position of the shaft 34', and the position of the support pin 53 was also changed to the position of the support pin 53 '. Incidentally, with the change to the position of the support pin 53 ', the cord member 54 is moved to the moving pulley 55' and the support pin 53 'so as to be turned back (clockwise) as in FIG. It is hung.

  The opening / closing assist device 1 ′ of this embodiment connects the rear end of the rotating arm 31 ′ by moving the position of the shaft 34 ′ located at the rear end of the rotating arm 31 ′ upward. The height H 2 of the side plate 21 ′ of the base 2 in the vertical direction (direction of arrow Z 1 -Z 2) can be smaller than the height H 1 of the side plate 21 of the base 2. Then, the height (length) of the opening / closing assist device 1 from the loading platform K downward is reduced, and downsizing can be realized. In addition, as the base 2 is miniaturized, the weight can also be reduced.

  As described above, since the side bumper, the fuel tank, the air device, and the like are arranged at the lower position of the loading platform K where the opening / closing assisting device 1, 1 ′ of the tilt plate is installed, the space is limited. In particular, since the mounting height position of the side bumpers is determined, the ability to miniaturize the apparatus in the vertical direction means that it can be arranged at a lower position of the loading platform K, which can solve the problem that interferes with the arrangement of the side bumpers. There is an advantage.

  Although the preferred embodiments of the present invention have been described above in detail, the present invention is not limited to the specific embodiments described above, and various modifications may be made within the scope of the present invention as set forth in the appended claims. It is possible to change or change it.

1, 1 'Opening / closing auxiliary device 2 base 21, 21' side plate 22 upper plate 23 connecting piece 24 rear plate 25 spring cover 3 arm mechanism 31, 31 'rotary arm portion 310 side plate 311 connecting plate 32 side link portion 320 rail member 33 Members 34, 35, 36 Axis 4 Traction generating mechanism 41 Helical spring (biasing means)
42 traction member 43 spring receiving portion 44 nut 5 traction force transmission mechanism 51 fixed pulley 52 shaft 53 support pin 54 string member 55, 55 'moving pulley 56 shaft 6 hinge K load carrier K2, S tilt plate

Claims (2)

A base fixed under a loading platform having a tilt plate, an arm mechanism provided on the front side of the base, a traction force generation mechanism provided on the rear side of the base, and a traction force generated in the traction force generation mechanism An open / close assist device for an elevator plate having a traction force transmission mechanism for transmitting to the mechanism,
The arm mechanism is
The base is configured to rotatably connect a rear end of the rotary arm, a front end of the rotary arm to a lower end of the side link, and an upper end of the side link to a mounting member fixed to the pivot plate.
The traction force generation mechanism is provided on the rear side of the base body,
The traction force transmission mechanism is sequentially hooked on a fixed pulley whose rear end is connected to the traction force generation mechanism and a middle part is fixed to the base, and a moving pulley provided on the rotating arm, and its tip is connected to the base An open / close assist device for a pivot plate characterized by being In the traction force generation mechanism, biasing means is provided on the rear side of the base, a pulling member is disposed in parallel with the biasing means, and a receiving portion of the biasing means is attached to a rear end of the pulling member. The biasing means is disposed between the receiving portion and the base,
The auxiliary device according to claim 1, wherein the biasing means and the pulling member are disposed on the rear side of the base in parallel with the longitudinal direction of the elevator plate.

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