JP5116015B2 - Elevator for cargo transportation - Google Patents

Description

  The present invention relates to a load carrying elevator that can carry a pallet loaded with loads using a liftable fork such as a hand pallet truck or a low lift truck.

For example, in a hand pallet truck, a pair of forks protrudes from the main body equipped with a lifting device, and the fork is moved up and down by operating the handle provided on the main body to carry the pallet loaded with cargo. It is possible.
In such a hand pallet truck, since the upper limit position of the fork is constant, there is a problem that it cannot be transported by a pallet or a box higher than the upper limit position. Therefore, in Patent Document 1, for example, a thickness adjusting material (raising member) is provided on the side of the fork so as to be rotatable between the fork upper surface and the side surface, and the fork upper surface is raised by the thickness adjusting material. An invention that can be carried on a pallet or the like is disclosed.

Japanese Patent Laid-Open No. 2002-19615

  Such a thickness adjusting material needs to be manually rotated, but it is cumbersome to raise and lower the heavy thickness adjusting material, which is not easy to use, and causes noise due to collision with the fork when it is raised and lowered . In addition, when the fork is not raised, the thickness adjusting material protrudes to the left and right of the fork, so that there is a risk of hitting an object during movement or obstructing insertion of the pallet.

  Therefore, the present invention provides a lifting device for transporting a cargo which can smoothly raise and lower the raising member with a small force, suppresses the generation of noise, and minimizes the portion protruding from the fork when not in use, and is excellent in usability. It is for the purpose.

In order to achieve the above object, according to the first aspect of the present invention, the fork is formed in a frame shape surrounding the outer periphery of the fork, and is positioned above the fork by a plurality of links provided between the fork and the fork. While providing a raising frame that can be raised and lowered between the raised position and a lowered position that fits on the fork, the main body is provided with a rotating member that rotates in conjunction with raising and lowering of the raising frame, and the rotating member is provided with the raising frame. A lifting and lowering device for carrying goods, each of which is provided with a biasing means for biasing the movement associated with the ascent and a braking means for applying braking to the movement associated with the descending of the raising frame , wherein the rotating member is interposed via the raising frame and the link arm. The urging means is stretched between the eccentric position of the rotating member and the main body, and has a maximum length at the rotating position of the rotating member corresponding to the lowered position of the raising frame. On the other hand, the braking means is a rotary damper that is provided on the rotating member and that exerts braking torque in accordance with the rotation of the rotating member from the rotating position corresponding to the raised position of the raising frame to the descending side. To do.
According to a second aspect of the present invention, in order to obtain effective braking means in the configuration of the first aspect , the rotating member includes a first turntable to which the link arm and the tension spring are connected, and a first rotation thereof. It is formed from a second rotating disk that is coaxial with the disk and can be rotated separately, and is provided with a rotary damper. A slot that is concentric with the center of rotation is formed on either the first rotating disk or the second rotating disk. On the other hand, engaging pins that are loosely inserted into the long holes are provided, respectively, so that the second rotating disk follows the rotation of the first rotating disk with a delay.
According to a third aspect of the present invention, in the configuration of the first or second aspect , in order to allow the raising frame to be easily lifted and lowered, the lever is connected to the main body so as to be able to lift and lower the raising frame. Is provided.

According to the first aspect of the present invention, the raising and lowering of the raising frame can be performed smoothly with a small force, and the generation of noise can be suppressed. Further, since the fork is enclosed so as to surround the fork when not in use, there is no hindrance to the fork carrying work. Therefore, it is possible to use a raised frame excellent in usability.
Furthermore , by using the rotating member, the urging means and the braking means can be disposed in a compact and space-saving manner.
Further , by adopting a tension spring or a rotary damper, the biasing means and the braking means can be formed compactly and easily.
According to the invention described in claim 2, in addition to the effect of claim 1, the rotating member first, it was so as to follow the rotation in the long hole and the engaging pin is divided into a second rotating disk The timing for obtaining the braking torque of the rotary damper can be set optimally, and effective braking means can be obtained.
According to the third aspect of the present invention, in addition to the effect of the first or second aspect , by adopting the lever, the raising frame can be easily raised and lowered on the main body side, and the operability related to the raising and lowering of the raising frame is improved. .

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
FIG. 1 is an explanatory view of a hand pallet truck which is an example of a cargo transport elevator, in which the upper side shows a plane and the lower side shows a side surface. FIG. 2 is a perspective view of the hand pallet truck (the lifting device and the like are omitted). The hand pallet truck 1 includes a lifting device 3 including a handle 4 and a hydraulic mechanism in front of the main body 2 (left side in FIG. 1), and a pair of forks 5 and 5 projecting from the rear of the main body 2. The forks 5 and 5 can be raised by operating the elevating device 3 by raising and lowering the handle 4 forward and backward. A front wheel 6 is provided at the lower end of the handle 4, and a rear wheel 7 is provided at the tip of the fork 5.

  8 and 8 are raised frames (hereinafter simply referred to as “frames”) provided on each fork 5, and are formed so as to surround the left and right and the front end of the fork 5 with a long plate material. A square plate-like stopper 9 having a buffer rubber 10 attached to the rear surface is vertically connected. The frame 8 is formed by a plurality of links 11, 11,... Having a U-shaped cross section disposed at predetermined intervals in the front-rear direction between the left and right plate parts and the left and right side surfaces of the corresponding forks 5. The link pins 11 fall backward and the stopper pins 12, 12... Projecting from the side of the fork 5 come into contact with the lower end of the frame 8, and the link 11 stands forward and the fork 5 It can rotate between the raised position supported above. In the lowered position, the frame 8 is fitted on the fork 5 and the upper surface thereof is substantially flush with the upper surface of the fork 5.

Further, as shown in FIGS. 3 and 4, a stepped shaft 13 is projected outwardly on the left and right side surfaces of the main body 2, and this stepped shaft 13 is linked to the lifting operation of the frame 8. As the rotating members that rotate, the first rotating disk 14 and the second rotating disk 15 are assembled so as to be rotatable. Since the left and right have the same structure, the following description will be made centering on the left side.
First, the first turntable 14 is assembled to the first stage of the stepped shaft 13 by a plain washer 16 and a retaining ring 17, and on the outer surface of the arm portion 18 projecting radially from the rotation center, From the connection pin 19 and the spring pin 20, the bolt 21 serving as the engagement pin protrudes, and the link arm is connected between the connection pin 19 and the connection pin 22 fixed outwardly on the front surface of the stopper 9. 23 is erected. That is, as the frame 8 moves up and down, the first turntable 14 is linked and rotated via the link arm 23.

Next, the second turntable 15 is rotatably assembled by a retaining ring 25 on the second stage of the stepped shaft 13 with a rotary damper 24 serving as a braking means fixed to the front side. The rotary damper 24 is a well-known configuration that applies braking to the input torque by the viscosity of the oil sealed inside, and is a one-way type that exerts a braking action only on the input torque in the clockwise direction as seen in FIG. ing.
Further, an arc-shaped long hole 26 concentric with the rotation center is formed on the outer periphery of the second turntable 15, and the bolt 21 of the first turntable 14 can be loosely inserted into the long hole 26 in the assembled state. It has become. In addition, a locking projection 27 is provided outside the long hole 26.

  Reference numeral 28 denotes a cylindrical guide ring that is fixed to the side surface of the main body 2 from the outside of the second turntable 15, and is a tension member that serves as a biasing means wound along a V-groove 29 formed on the peripheral surface thereof. One end of the spring 30 is hooked on the spring hook pin 20 of the first turntable 14, and the other end is hooked on a spring hook pin 31 projecting from the side surface of the fork 5 below the first turntable 14. . Further, at the edge of the main body 2 side above the guide ring 28, there is a notch 32 through which the arm portion 18 of the first rotating disk 14 and the locking protrusion 27 of the second rotating disk 15 penetrate and protrude outward. Is formed. Accordingly, the rotation of the first rotating disk 14 is restricted within a range in which the arm portion 18 contacts both ends of the notch 32 in the circumferential direction, and the first rotating disk 14 is urged to rotate in the counterclockwise direction by the tension spring 30. Further, the rotation of the second turntable 15 is restricted within a range in which the locking protrusions 27 are in contact with both circumferential ends of the notch 32.

In the hand pallet truck 1 configured as described above, when the frame 8 is in the lowered position, the stopper 9 is positioned at the rear and downward as shown in FIGS. Is rotated clockwise (referred to in the direction seen in the side view of FIG. 1; hereinafter the same in the direction of rotation) against the tension bias of the tension spring 30, and the arm portion 18 is positioned at the right end of the notch 32 of the guide ring 28. Let Therefore, the tension spring 30 is extended to the maximum, and the rotational biasing force applied to the first turntable 14 is maximized. In this state, since the height of the frame 8 is the same as that of the fork 5 as described above, a pallet or the like can be conveyed using the upper surface of the fork 5.
And when conveying the pallet etc. higher than the upper limit position of the fork 5, it operates so that the front-end | tip of the flame | frame 8 may be lifted by hand. Then, each link 11 stands up and is raised above the fork 5 while rotating the frame 8 forward. At this time, the stopper 9 of the frame 8 is connected via the link arm 23 to the first rotating disk 14 that is rotated and biased by the tension spring 30 to rotate counterclockwise. It is assisted by the urging force and can be raised easily with a small force.

  When the first turntable 14 is rotated counterclockwise as the frame 8 is lifted, when the bolt 21 comes into contact with the left end of the long hole 26 of the second turntable 15, the second turntable 15 also follows and moves to the left. Rotate. When the locking projection 27 of the second rotating disk 15 contacts the left end of the notch 32 and the rotation stops, the rotation of the first rotating disk 14 also stops, and the frame 8 is connected to each link as shown in FIGS. 11 is held in a raised position slightly inclined forward. Therefore, even a pallet or the like higher than the upper limit position of the fork 5 can be conveyed using the frame 8.

  On the other hand, when returning the frame 8 from the raised position to the lowered position, holding the tip of the frame 8 and tilting each link 11 backward allows the frame 8 to be lowered to rotate backward. At this time, the first turntable 14 also rotates to the right via the link arm 23, but the bolt 21 of the first turntable 14 is inserted into the long hole 26 of the second turntable 15 as shown by a two-dot chain line in FIG. 6. When coming into contact with the right end, the second turntable 15 follows and rotates to the right. Since the rotary damper 24 exerts braking torque by the right rotation of the second turntable 15, even if the link 11 tilts backward beyond the upright position, the frame 8 does not descend at a stretch due to the weight. By the action of the damper 24, it slowly descends to the lowered position and returns to the position of FIG. This does not change even if the hand is released during the operation.

As described above, according to the hand pallet truck 1 of the above-described form, the fork 5 is formed in a frame shape surrounding the outer periphery of the fork 5, and is disposed above the fork 5 by the plurality of links 11 installed between the fork 5. A frame 8 that can be moved up and down between a raised position that is located on the fork 5 and a lowered position that fits on the fork 5 is provided. By providing an urging means (tensile spring 30) for urging the frame 8 and a braking means (rotary damper 24) for applying braking to the movement accompanying the lowering of the frame 8, the frame 8 can be raised and lowered smoothly with a small force. Noise generation is also suppressed. Further, when the frame 8 is not used, the frame 8 is enclosed so as to surround the fork 5, so that there is no hindrance to the conveyance work by the fork 5. Therefore, it is possible to use the frame 8 that is excellent in usability.
In particular, the main body 2 is provided with rotating members (first and second rotating disks 14 and 15) that rotate in conjunction with the raising and lowering of the frame 8, and the rotating members are provided with biasing means and braking means. The biasing means and the braking means can be disposed in a small space in a compact manner by using the rotating member.

In addition, the first turntable 14 is connected to the frame 8 via the link arm 23, and the urging means is installed between the eccentric position of the first turntable 14 and the main body 2. The tension spring 30 has a maximum length at the rotational position of the first rotating disk corresponding to the second rotating disk 15, and the braking means is provided on the second rotating disk 15 from the rotating position corresponding to the raised position of the frame 8 to the lower side. By using the rotary damper 24 that exerts the braking torque along with the rotation of the second turntable 15, the urging means and the braking means can be formed compactly and easily.
Further, the rotating member can be rotated separately from the first rotating disk 14 to which the link arm 23 and the tension spring 30 are connected, and the first rotating disk 14, and the second rotation in which the rotary damper 24 is provided. The first rotating disk 14 is provided with a long hole 26 concentric with the rotation center, the first rotating disk 14 and a bolt 21 loosely inserted into the long hole 26. By making the second turntable 15 follow the rotation later, the timing for obtaining the braking torque of the rotary damper 24 can be set optimally, and effective braking means can be obtained.

In the above embodiment, the engaging pin is provided on the first rotating disk and the long hole is provided on the second rotating disk, but they may be provided on the opposite sides. Further, the mounting positions of the first rotating disk and the second rotating disk with respect to the stepped shaft can be reversed before and after the axial direction.
Further, the tension spring is not limited to the arrangement form wound around the guide ring, but is constructed in a substantially straight line between the main body and the first rotating disk, or a shock absorber or a tension spring is used as a braking means. Changes are also possible.
In addition, in the above embodiment, the rotating member is formed by the two first and second rotating disks. However, the urging means and the braking means can be provided together as a single rotating disk (rotating member). .

On the other hand, in the above embodiment, the frame 8 is lifted and lowered directly with the tip. However, as shown in FIG. As shown in FIGS. 8 and 9, as shown in FIGS. 8 and 9, the connecting link 34 is installed between the position and the connecting pin 22 of the stopper 9 that connects the link arm 23, and the lever 33 is tilted forward. It may be possible to raise it. In the case of movement to the lowered position, the lever 33 is tilted backward.
In this manner, if the main body 2 is provided with the lever 33 that is connected to the frame 8 and allows the frame 8 to be moved up and down, the frame 8 can be easily raised and lowered on the main body 2 side. Improves.

  Further, not limited to a form using a rotating member, as shown in FIGS. 10 and 11, a support plate 35 that can swing up and down around a fulcrum shaft 36 is attached to the side surface of the main body 2. In addition, a rod 37 that is connected to the connecting pin 22 of the stopper 9 and slides in the axial direction according to the raising and lowering of the frame 8 and a shock absorber 38 that protrudes the plunger 39 forward are provided in parallel. A configuration in which a coil spring 43 is interposed between the large-diameter sleeve 40 provided in the middle of the rod 37 and the bent piece 42 on the rear side of the bent pieces 41 and 42 holding the rod 37 is also conceivable. It is done. Note that a contact rod 44 that contacts the plunger 39 of the shock absorber 38 during the lowering of the frame 8 is connected to the front end of the rod 37.

In the case of this modified example, when the frame 8 is lowered from the raised position in FIG. 10A, the contact rod 44 of the rod 37 is moved to the plunger 39 of the shock absorber 38 at an intermediate position as shown in FIG. Therefore, the braking force is exerted from here, and the frame 8 does not descend at once due to the weight, but slowly descends to the lowered position in FIG. Here, since the sleeve 40 abuts against the coil spring 43 and compresses from the intermediate position, a braking force due to the elasticity of the coil spring 43 is also applied.
When the frame 8 is lifted from the lowered position in FIG. 10C, the biasing force of the coil spring 43 acts between the intermediate position in FIG. Can be lifted easily with force.
Also in this modified example, it is possible to change such as providing a tension spring on the front side of the sleeve or using a coil spring instead of the shock absorber.

In addition, the frame can be appropriately changed in accordance with the form of the fork, and the number and arrangement positions of the links are not limited to the above form. For example, in the above embodiment, the link falls backward and the frame rises to the lower position, and rises forward to the raised position, but conversely, the link falls forward and the frame is lowered to the rear position. You may make it stand up and become a raise position. In this case, the direction of action of the biasing means and the braking means is opposite to that of the above embodiment. Furthermore, the present invention is not limited to manual lifting, and it is also possible to employ an electric mechanism that lifts and lowers the frame by operating a push button switch using a motor.
In addition, the frame can be directly connected with the link arm without the stopper, or the guide ring can be eliminated depending on the arrangement of the tension spring, and the rotation of the rotating disk can be controlled by the stopper plate protruding from the side of the main unit. Such design changes are also conceivable. Further, in the case of a pair of forks, the frames can be connected and synchronized to be lifted and lowered. In this case, a rotating member may be provided only on the left or right side.
And as a hand pallet truck, a fork may be a single type, and of course, this invention is applicable not only to a hand pallet truck but other lifts for goods conveyance, such as a low lift truck.

It is explanatory drawing of a hand pallet truck, and the upper side shows a plane and the lower side shows a side surface, respectively (a frame is a descending position). It is a perspective view from the front of a hand pallet truck (a lifting device etc. are omitted, and a frame is a lowered position). It is a perspective view from the back of a hand pallet truck (a lifting device etc. are omitted, and a frame is a raised position). It is an A section enlarged view. It is a perspective view from the front of a hand pallet truck (a lifting device etc. are omitted, and a frame is a raised position). It is a side view of a hand pallet truck (a lifting device etc. are omitted, and a frame is a raised position). It is a perspective view from the front of the hand pallet truck of the example of a change (a lifting device etc. are omitted, and a frame is a lowered position). It is explanatory drawing of the hand pallet truck of the example of a change, and the upper is a perspective view from back, and the bottom shows a side surface, respectively (elevating device etc. are abbreviate | omitted, a flame | frame is in the middle of a raise). It is explanatory drawing of the hand pallet truck of the example of a change, the upper is a perspective view from back, and the lower side each shows a side surface (a lifting device etc. are abbreviate | omitted, a flame | frame is a raise position). In the side view of the hand pallet truck of the modified example, (A) shows the raised position of the frame, (B) shows the intermediate position, and (C) shows the lowered position. It is explanatory drawing of the example of a change of a braking means and a biasing means, and the upper side shows a plane, the lower side shows a front, and the right shows a side surface, respectively.

Explanation of symbols

  1 .... hand pallet truck 2 .... main body 3 .... lifting device 4, ... handle 5, ... fork, 8 .... lifting frame, 9 .... stopper, 11 .... link, 13 .... stepped shaft , 14 .. First turntable, 15 .. Second turntable, 18 .. Arm part, 23 .. Link arm, 24 .. Rotary damper, 26 .. Long hole, 27.・ Guide ring, 30 ・ ・ Tension spring, 35 ・ ・ Support plate, 37 ・ ・ Rod, 38 ・ ・ Shock absorber, 43 ・ ・ Coil spring.

Claims (3)

A fork that moves up and down by the lifting device protrudes behind the body equipped with the lifting device ,
The fork is formed in a frame shape that surrounds the outer periphery of the fork, and a plurality of links provided between the fork and a raised position that is positioned above the fork, and a lowered position that is externally fitted to the fork. While providing a raised frame that can be raised and lowered between
The main body is provided with a rotating member that rotates in conjunction with the raising and lowering of the raising frame, and an urging means that urges the rotating member to move with the raising of the raising frame, and a movement with the raising of the raising frame. A load carrying elevator provided with braking means for applying braking to the vehicle ,
The rotating member is connected to the raising frame via a link arm, and the urging means is constructed between the eccentric position of the rotating member and the main body, and corresponds to the lowered position of the raising frame. While the tension spring has a maximum length at the rotation position of the rotation member, the braking means is provided on the rotation member to rotate the rotation member from the rotation position corresponding to the raised position of the raising frame to the lower side. A lifting and lowering machine for conveying goods, characterized by being a rotary damper that exhibits braking torque . The rotating member is formed of a first rotating disk to which the link arm and the tension spring are connected, and a second rotating disk that is coaxially rotatable with the first rotating disk and is provided with a rotary damper. Either one of the first turntable and the second turntable is provided with a long hole concentric with the center of rotation, and the other is provided with an engagement pin that is loosely inserted into the long hole, thereby rotating the first turntable. load transportation lifts according to claim 1, wherein the second rotating disk is to follow behind the. 3. A cargo transporting elevator according to claim 1, wherein a lever is provided on the main body so as to be connected to the raising frame to enable the raising and lowering operation of the raising frame.

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