JP5324811B2 - Transport cart - Google Patents

Description

  The present invention relates to a transport carriage used for transporting articles in a factory or a warehouse.

  The transport cart has a handle erected at the rear end of the machine base having a pair of wheels on the front and rear, and the operator can move forward by grasping the handle and pushing the operator from the rear. Can be transported. However, if the weight of the article is large, the load on the worker at the time of starting becomes large, and the workability is lowered. Therefore, Patent Document 1 tries to reduce the load by providing initial power to the rotation of the axle by providing an initial motion lever using a ratchet on the rear wheel axle and operating the initial motion lever at the start. A hand cart is disclosed.

Japanese Patent Laid-Open No. 9-66840

  However, in the hand cart of Patent Document 1, since the initial movement lever is provided on the axle, when the handle is provided, the operation of pushing the handle and the operation of the initial movement lever are separate and difficult to operate. It was difficult to adjust the timing of the operation, making it difficult to use. Further, since the initial power is directly applied to the axle, a large initial power cannot be obtained.

  SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a transport cart that can easily and effectively reduce a load at the time of starting and is excellent in usability.

In order to achieve the above object, the invention according to claim 1 is capable of arbitrarily tilting the handle between a front position standing in a vertical direction and a rear position tilted from the front position to the rear by a predetermined angle. The machine base is provided with an actuating member that moves back and forth in conjunction with the tilting of the handle forward and backward, while the machine base only converts the forward movement of the actuating member into a rotational biasing force in the forward direction of the wheel. A transport cart provided with a starting load reduction mechanism for transmitting ,
A starting load reducing mechanism includes a rack that is provided at the front end of the operating member and moves integrally back and forth, a drive rod that rotates in the forward direction in conjunction with a forward movement of the rack via a gear, and the drive rod and wheels. A first gear that is formed from an endless body that is stretched between the wheels and that transmits the rotation of the drive rod to the wheels, and that is provided so as to be swingable in the vertical direction on the operating member. And a gear box that is provided integrally with the drive rod and meshes with the first gear, and a gear box that supports the first gear and the second gear. A rail is provided which is supported at the upper position where it is engaged and moves the rack to a lower position away from the first gear when the operating member is retracted, and a push-up member which pushes the rack upward at the retracted position of the operating member. Things to do A.
According to a second aspect of the present invention, in the configuration of the first aspect , in order to facilitate the tilting and pushing operation of the handle, the lower end of the handle is connected to the rear end of the machine base so as to be rotatable around a left-right axis. In addition, a driving gear coaxial with the rotation center is provided at the lower end, and the upper end of the swinging member is connected to the rear end of the machine base so as to be rotatable about a horizontal axis, and the upper end is coaxial with the rotation center. In addition, a driven gear meshing with the drive gear is provided, the lower end of the swing member is connected to the operating member, and the swing member is swung back and forth via the driven gear by the rotation of the drive gear accompanying the tilting of the handle. The operating member is moved back and forth.

According to the first aspect of the present invention, the load at the time of starting can be easily and effectively reduced by adopting the operating member and the starting load reducing mechanism. In particular, since the load can be reduced by pushing the handle forward, the pushing operation of the handle and the subsequent pushing operation of the transport carriage are reasonably continued and excellent in usability.
Further , the forward movement of the actuating member can be efficiently converted into the rotational biasing force of the wheel, and a suitable starting load reduction mechanism can be obtained.
Furthermore , the forward movement of the actuating member can be converted into the rotation of the drive rod with a simple configuration.
According to the second aspect of the present invention, in addition to the effect of the first aspect , the handle can be easily tilted and pushed using the gear.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
1 to 3 are perspective views showing an example of a transport cart. The transport cart 1 has a square frame at the rear end (the left side in FIG. 1 is the rear side) of a frame-like machine base 2 having a rectangular plan view. A vertical handle 3 is erected. Fixed wheels 4, 4 whose directions are fixed in the front-rear direction are provided in front of the bottom surface of the machine base 2, and rotatable movable wheels 5, 5 are provided in the rear of the bottom surface. Further, the handle 3 is provided along a square frame-like frame 6 erected at the rear end of the machine base 2.
On the other hand, the handle 3 is located on the rear surface of the frame 6 and is shaped like a handle 8 by bending the upper part back in a U-shape, and on both sides of the lower end, a drive gear 9 centering on the left and right axis. , 9 are fixed to each other, and the central axis of the drive gear 9 is rotatably connected to upper portions of mounting plates 7, 7 provided on the left and right sides in the frame 6.

  Further, below the mounting plates 7 and 7, an upper end of a swing link 10 serving as a swing member is connected. The swing link 10 is provided with upper connecting plates 12 and 12 at both ends of the horizontal bar portion 11 in the left-right direction, and driven gears 13 and 13 meshing with the driving gears 9 and 9 of the handle 3 at the upper end of the upper connecting plate 12. Are fixed so that the central axes of the driven gears 13 and 13 are rotatably connected to the bottom of the mounting plates 7 and 7. Further, a pair of L-shaped lower connection plates 14, 14 parallel to the upper connection plate 12 are fixed to the center of the horizontal bar portion 11 at a predetermined interval in the left-right direction. The upper end of the small link 15 is rotatably mounted on the connecting shaft 16 between the front ends of the lower ends. The lower end of the small link 15 is connected to a rear end of an operating rod 17 serving as an operating member so as to be rotatable up and down by a pin 18. The operating rod 17 is connected to the machine base 2 in a U-shaped receiving manner. The metal plate 19 is supported so as to be movable in the front-rear direction.

Therefore, when the handle 8 of the handle 3 is gripped and tilted backward from the front position standing in the vertical direction along the frame 6, the drive gears 9, 9 are rotated rearward and the driven gears 13, 13 are moved forward. Rotate and swing the swing link 10 backward. Then, the operating rod 17 moves backward through the lower connecting plates 14 and 14 and the small link 15.
On the other hand, when the handle 3 is returned to the front position from the tilted rear position, the drive gears 9 and 9 are rotated to the front side, the driven gears 13 and 13 are rotated to the rear side, and the swing link 10 is swung forward. Move. Then, the actuating rod 17 moves forward through the lower connecting plates 14 and 14 and the small link 15.

At the center of the side surface of the handle 3, a lock plate 20 having a downward key-like locking portion 21 at the front end is connected so as to be rotatable up and down, and between the rear end of the lock plate 20 and the upper side of the handle 3. 1 and 2 is urged to rotate leftward in FIGS. A pin 23 that can lock the locking portion 21 of the lock plate 20 at a front position of the handle 3 is fixed to the upper end surface of the frame 6. An inclined surface 24 that allows the pin 23 to get over when returning to the front position is formed.
Reference numeral 25 denotes a lock release lever provided on the handle 8 of the handle 3. A wire 26 having one end fixed to the lock release lever 25 is locked through a wire tube 27 attached along the handle 8 and the handle 3. The front end of the plate 20 is connected. Therefore, when the lock release lever 25 is gripped, the wire 26 can rotate the lock plate 20 in the right direction against the biasing force of the tension spring 22.

Then, the starter load is reduced when the forward movement of the operating rod 17 associated with the movement of the handle 3 from the rear position to the front position is converted into the rotational urging force of the fixed wheels 4 and 4 in the forward direction. A mechanism 30 is provided. Hereinafter, the starting load reduction mechanism 30 will be described in detail.
First, a narrow plate-like rack 31 having teeth formed on the upper surface is connected to the tip of the operating rod 17 so as to be movable up and down by pins 32 and inserted into a gear box 33 provided on the lower surface of the machine base 2. . As shown in FIGS. 4 to 6, the gear box 33 is formed in an inverted U shape with the front and rear and the upper surface opened, and a shaft 35 integrally provided with a first gear 36 between both side plates 34, 34. Is constructed in the left-right direction, and the rack 31 can be engaged with the lower side of the first gear 36.

  In addition, a pair of rails 37 and 37 having a L-shaped cross section and a shorter length in the front-rear direction than the side plate 34 are spaced apart from the side plates 34 and 34 below the first gear 36. In this case, the gear box 33 is attached in an opposing manner at a position above the bottom surface of the gear box 33. At the front end of the rack 31, the engagement pin 38 is provided in a penetrating state, and when the both ends of the engagement pin 38 are placed on the top surfaces of the rails 37, 37, the rack 31 is at an upper position where it engages with the first gear 36. In a state where the engagement pin 38 is supported and disengages from the upper surface of the rails 37, 37, the rack 31 is supported at a lower position where the front end abuts against the bottom surface of the gear box 33 and is separated from the first gear 36. Yes. In addition, a round bar 39 as a push-up member is provided at the rear end position of the bottom surface of the gear box 33 and the rack 31 retracted from the lower position rides up and pushes it upward. Therefore, the rails 37 and 37 are formed with notches 40 and 40 that allow the engagement pins 38 of the rack 31 that ride on the round bar 39 to pass through and allow the return to the upper position.

  Reference numeral 41 denotes a drive rod that penetrates the side plates 34, 34 in the left-right direction in front of the first gear 36. The drive rod 41 has bearings 42, 42 provided on the side plates 34 at intermediate portions, and both end portions of the drive rod 41 are machine bases. It is rotatably supported by bearings 44, 44 provided on support plates 43, 43 suspended from 2. A second gear 45 having a diameter smaller than that of the first gear 36 is provided coaxially and integrally with the drive rod 41 in a state of meshing with the first gear 36 in the center of the drive rod 41 in the gear box 33. A pair of sprockets 46, 46 are integrally provided on both sides of the drive rod 41 inside the support plates 43, 43, and are provided coaxially and integrally with each sprocket 46 and the side surface of each fixed wheel 4. Chains 48 that are endless bodies are respectively stretched between the sprockets 47.

  In the transport carriage 1 configured as described above, at the front position of the handle 3, the lock plate 20 is locked to the pin 23 and the handle 3 is integrated with the frame 6 as shown in FIGS. The moving link 10 is also in a forward swing position as shown in FIG. Therefore, the operating rod 17 and the rack 31 are also in the advanced position. At this time, since the rack 31 has advanced to a position where the engagement pin 38 at the front end exceeds the rails 37, 37, the front end falls below the rails 37, 37 as shown by a two-dot chain line in FIG. The lower position is in contact with the bottom surface of the box 33 and is separated from the first gear 36.

  When the handle 3 is tilted backward in a state where the lock plate 20 is rotated by grasping and operating the lock release lever 25 from here and the lock to the frame 6 is released, the drive gear 9 and the driven gear 13 are used. The swing link 10 swings backward. Accordingly, the operating rod 17 and the rack 31 are retracted via the small link 15. At this time, as shown by a two-dot chain line in FIG. 8, the rack 31 moves backward with the engaging pin 38 passing under the rails 37, 37 while keeping the forward inclined posture with the front end in contact with the bottom surface of the gear box 33. Therefore, it does not mesh with the first gear 36. Note that the rear end of the rack 31 moves backward while being tilted forward, so that the rear end interferes with the round bar 39 and gradually rises. However, since the rack 31 is axially attached to the operating rod 17 by the pin 32, the operating rod The upper end of 17 rises to follow the rack 31 and does not prevent the rack 31 from moving backward.

  When the handle 3 reaches the rear position in FIG. 8, the actuating rod 17 and the rack 31 also reach the retracted position. At this time, the intermediate portion of the rack 31 rides on the round bar 39, and as shown by the solid line in FIG. Then, the engaging pin 38 moves to the upper surface of the rails 37, 37 through the notches 40, 40, and the rack 31 returns to the upper position behind the first gear 36. A stopper 49 is provided at the front end of the actuating rod 17 so as to abut against the metal fitting 19 at the retracted position and restrict the actuating rod 17 from being further retracted, that is, tilting the handle 3.

  When the handle 3 is rotated forward by pushing the handle 8 forward from this point, the swing link 10 swings forward via the drive gear 9 and the driven gear 13. Therefore, the operating rod 17 and the rack 31 move forward through the small link 15. At this time, the rack 31 moves forward while maintaining the horizontal posture as the engaging pin 38 slides on the rails 37, 37, meshes with the first gear 36, and rotates rightward as viewed in FIG. Then, the second gear 45 meshed with the first gear 36 rotates counterclockwise, and the drive rod 41 simultaneously rotates counterclockwise. Therefore, the sprockets 46 at the both ends of the drive rod 41 also rotate counterclockwise, and the sprocket 47 on the side surface of each fixed wheel 4 rotates counterclockwise via the chain 48. Thereby, since the fixed wheels 4 and 4 also rotate counterclockwise, the urging force in the forward direction acts on the transport carriage 1 and can be easily started forward even with a small force.

  When the handle 3 reaches the front position in FIG. 7, the lock plate 20 automatically engages with the pin 18 and the tilt of the handle 3 is locked. On the other hand, in the rack 31 that has advanced, the engagement pin 38 exceeds the front ends of the rails 37 and 37 as shown by the solid line in FIG. The front end of the rack 31 is a lower position where it falls to the bottom surface of the gear box 33.

  Thus, according to the conveyance carriage 1 of the said form, the handle | steering-wheel 3 is provided so that it can incline arbitrarily between the front position which stands up in the perpendicular direction, and the back position which inclined the predetermined angle from the front position back. The machine base 2 is provided with an actuating rod 17 that moves back and forth in conjunction with the tilting of the handle 3 in the front-rear direction. On the machine base 2, only the forward movement of the actuating rod 17 is performed in the forward direction of the fixed wheels 4 and 4. By providing the start load reducing mechanism 30 that converts and transmits the rotation bias force, the load at the start can be reduced easily and effectively. In particular, since the load can be reduced by pushing the handle 3 forward, the pushing operation of the handle 3 and the subsequent pushing operation of the transport carriage 1 are reasonably continuous and excellent in usability.

  Also, here, the starting load reducing mechanism 30 is provided at the front end of the operating rod 17 and integrally moves back and forth, and the rack 31 moves forward via gears (first and second gears 36 and 45). The drive rod 41 rotating in the forward direction in conjunction with it, and the chains 48, 48 that are stretched between the drive rod 41 and the fixed wheels 4, 4 and transmit the rotation of the drive rod 41 to the fixed wheels 4, 4. Therefore, the forward movement of the actuating rod 17 can be efficiently converted into the rotational urging force of the fixed wheels 4 and 4, and a suitable starting load reducing mechanism 30 can be obtained.

  Further, the rack 31 is provided on the operating rod 17 so as to be swingable in the vertical direction, while the gear is provided integrally with the first gear 36 that can be engaged with the rack 31 and the drive rod 41 and the first gear 36 is engaged. The rack 31 is supported by the gear box 33 formed by the second gear 45 and supporting the first gear 36 and the second gear 45 at an upper position where the rack 31 is engaged with the first gear 36 when the operating rod 17 moves forward. By providing rails 37, 37 that move the rack 31 to a lower position away from the first gear 36 when the rod 17 is retracted, and a round bar 39 that pushes the rack 31 upward at the retracted position of the operating rod 17, The forward movement of the actuating rod 17 can be converted into the rotation of the drive rod 41 with a simple configuration.

  In addition, the lower end of the handle 3 is connected to the frame 6 at the rear end of the machine base 2 so as to be rotatable about a horizontal axis, and drive gears 9 and 9 coaxial with the rotation center are provided at the lower end of the handle 3. The upper end of the swing link 10 is connected to the frame 6 of the machine base 2 so that the upper end of the swing link 10 can rotate about the left and right axis, and the upper end of the swing link 10 is coaxial with the rotation center and meshes with the drive gears 9 and 9. Driven gears 13, 13 are provided, the lower end of the swing link 10 is connected to the operating rod 17, and the swing link 10 is moved back and forth via the driven gear 13 by the rotation of the drive gear 9 as the handle 3 tilts. By swinging and moving the operating rod 17 back and forth, the handle 3 can be easily tilted and pushed using the gear.

The present invention is not limited to the above embodiment. For example, a pulley is used instead of a sprocket, a belt is used as an endless body, or an endless body is not stretched on the side surface of a fixed wheel. It is conceivable to change the design such as providing a groove on the peripheral surface of the fixed wheel and extending an endless body over the groove. Also, not only the front fixed wheel, but if the rear is a fixed wheel, a drive rod is provided on the rear fixed wheel side by changing the number of gears, etc., and between the drive rod and the rear fixed wheel An endless body can be stretched to reduce the starting load.

On the other hand, the operating rod may be moved back and forth using one or a plurality of links without using a gear in the handle, and the shape of the handle itself is not limited to the frame shape, but may be one such as a hand lift. It is also possible to provide the handle of the book so as to be tiltable so that the operating member is interlocked.
In addition, the machine base can be appropriately changed without departing from the gist of the present invention, such as a plate shape instead of a frame shape.

It is the perspective view which looked at the conveyance trolley from diagonally forward. It is the perspective view which looked at the conveyance trolley from diagonally back. It is the perspective view which looked at the conveyance trolley from the lower part. It is explanatory drawing of a conveyance trolley, the upper side shows a plane, the lower side shows a side surface, and the right shows a back surface, respectively. It is explanatory drawing of a starting load reduction mechanism, and the upper side shows a plane, the right shows a side, and the lower shows a front, respectively. It is a perspective view of a starting load reduction mechanism. It is explanatory drawing which shows the operation state of a starting load reduction mechanism (a handle is a front position). It is explanatory drawing which shows the operation state of a starting load reduction mechanism (a handle is a back position).

Explanation of symbols

  1 .... Transport cart 2 .... Machine base 3 .... Handle 4 .... Fixed wheels 5 .... Movable wheels 6 .... Frames 8 .... Handle 9 ... Drive gears 10 .... Oscillation Link, 13 ... Driven gear, 15 ... Small link, 17 ... Actuating rod, 20 ... Lock plate, 25 ... Lock release lever, 30 ... Start load reducing mechanism, 31 ... Rack, 33 ... Gear Box 36 ·· First gear 37 · · Rail 38 · · Engagement pin 39 · · Round rod 41 · · · Drive rod 45 · · · Second gear 46, 47 · · · Sprocket 48 · · · chain.

Claims (2)

At the rear end of the machine base with wheels on the front and back of the bottom, a handle for pushing operation is erected ,
The handle is provided so that it can be arbitrarily tilted between a front position standing in the vertical direction and a rear position tilted backward from the front position by a predetermined angle, so that the handle can be tilted back and forth. While providing an operating member that moves back and forth in conjunction,
A transport carriage provided with a starting load reducing mechanism that converts only the forward movement of the actuating member into the rotational biasing force in the forward direction of the wheel and transmits it to the machine base ,
A rack provided at the front end of the actuating member for integrally moving the start load reducing mechanism, a drive rod that rotates in the forward direction in conjunction with a forward movement of the rack via a gear, and the drive rod and wheels An endless body that is stretched between and transmits the rotation of the drive rod to the wheel,
The rack is provided on the actuating member so as to be swingable in the vertical direction, and the gear is provided integrally with the drive rod and the first gear that can be engaged with the rack, and the second gear is engaged with the first gear. And a gear box that supports the first gear and the second gear, and supports the rack at an upper position that meshes with the first gear when the operating member moves forward, and when the operating member moves backward. A transport carriage comprising: a rail that moves the rack to a lower position that is separated from the first gear; and a push-up member that pushes the rack to the upper position at a retracted position of the operating member . The lower end of the handle is connected to the rear end of the machine base so as to be rotatable about a horizontal axis, and a drive gear coaxial with the rotation center is provided at the lower end, and the rear end of the machine base is swung. An upper end of the member is connected to be rotatable about a left-right axis, a driven gear that is coaxial with the rotation center and meshes with the drive gear is provided at the upper end, and the lower end of the swinging member is connected to the operating member. linked, by the rotation of the drive gear due to the tilting of the handle, according to claim 1 via the driven gear, characterized in that moving back and forth the actuating member by oscillating the oscillating member in the longitudinal Transport cart.

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