JPH0453303Y2 - - Google Patents

Description

[Detailed Description of the Invention] Industrial Application Field The present invention relates to a large tire transport vehicle used for transporting large tires used for aircraft and large vehicles.

Conventional Technology Large tires used on aircraft and large vehicles are quite heavy, so when replacing them, a hand-held lifter as shown in Figure 10 is used to transport the large tires. .

This lifter has front and rear casters 103 and 10.
A roller 1 is mounted on a pair of arms 101, 101 of a planar U-shaped truck frame 100 equipped with a roller 1, respectively.
02, 102 are rotatably supported, and a large tire W is placed astride these rollers 102, 102.

The rear caster 104 has a master cylinder 105 attached to its axle, and the body of the master cylinder 105 is connected to the rear bracket 107 of the bogie frame 100 via a link 106. The upper end is engaged with a support seat 109 on the rear upper side of the truck frame 100.

A plunger pump 111 operated by a lever 110 is attached to the master cylinder 105. By repeatedly operating this lever 110 in the up and down direction, the plunger pump 111 is operated, and the master cylinder 105 is activated. By stretching, the truck frame 100 can be raised to a forward tilted state using the front casters 103 as a fulcrum. This similar structure is shown in, for example, Japanese Utility Model Application No. 57-174499.

Problems to be Solved by the Invention Large tires W must be transported by hand using a lifter, and the rollers 102, 102
It has been pointed out that loading and unloading of the large tires W onto the top has to be done manually, which requires a great deal of labor and time, resulting in poor work efficiency.

Therefore, in order to save labor and improve work efficiency in transporting large tires, loading and unloading large tires, the applicant has previously filed Japanese Patent Application No. 60-193153 (Japanese Unexamined Patent Publication No. 62-56299). We are proposing a self-propelled large tire transport vehicle.

This parallel link mechanism is installed on the rear end of a cart that is self-propelled by an engine or motor and rotates horizontally around a support and swings vertically by a drive mechanism. A hanger arm is horizontally rotatably connected to the swinging end of the hanger arm, and a luggage hanger is suspended from the end of the hanger arm to scoop up a large tire onto a pair of rollers and hold it vertically. It is.

The present invention further improves the large tire transport vehicle proposed earlier, and allows the height of the luggage hanger to be adjusted to extend or contract according to the size of the large tire to be taken onto the holding roller, and the hanger arm allows the vehicle to be suspended. The lowering height can be kept low to reduce the vertical work space, and even when large tires of different sizes are loaded onto the holding rollers, the load hanger does not tilt due to a shift in the center of gravity, so it always remains vertical. This allows for stable cargo handling operations.

Measures to solve the problem: A deck capable of loading large tires is formed at the rear of a self-propelled cart with a driver's seat on the front side, and a pair of upper and lower columns are rotatably supported on this deck. a parallel link mechanism which pivotally supports a link, and an arm support shaft is connected with a pin between the free ends of these links so as to be swingable horizontally and vertically about the support; and the parallel link mechanism. A drive mechanism is arranged across the support column and the upper link to swing the parallel link mechanism up and down, a hanger arm is connected to the arm support shaft of the parallel link mechanism so as to be rotatable in the horizontal direction, and an inverted U A lower beam is provided across the lower end of the letter-shaped frame, and a pair of holding rollers are disposed on one side of the lower beam to protrude substantially horizontally in parallel, and are detachably suspended from the free end of the hanger arm. , a luggage hanger that holds a large tire vertically over the pair of holding rollers; The bracket has a pair of inner cylinders projecting at an angle, and a hook pin projecting from the upper surface to engage with and disengage from a notch formed in the free end of the hanger arm. a pair of outer cylinders that are slidably fitted onto the inner cylinder; and a balancer spring that is stretched between each of the inner cylinders and the outer cylinder to bear the loads of the frame, the lower beam, and the holding roller. , an inner cylinder having a screw shaft arranged between the inner and outer cylinders of each pair, rotatably attached to the upper end of the frame, and rotated by an operating handle at the lower end, which is pivotally connected to the bracket with a pin; a height adjustment mechanism consisting of a screw mechanism screwed into a nut member provided in the tip of the luggage hanger, the luggage hanger can be freely attached to and detached from the free end of the hanger arm via the hook pin of the height adjustment mechanism, and They are connected so that they can rotate in the horizontal direction.

Function By rotating the parallel link mechanism and the hanger arm in the horizontal direction, the parallel link mechanism and the hanger arm extend from above the deck of the cart. I lowered it to a nearby location, pushed the luggage hanger towards the large tire that was placed vertically, and
By applying a pair of holding rollers to the circumferential side of a large tire and lifting the luggage hanger, the large tire can be scooped up while straddling the pair of holding rollers.

Therefore, by horizontally rotating the hanger arm and the parallel link mechanism again onto the deck, large tires can be easily loaded onto the deck together with the luggage hanger.

When the truck is driven to the destination and the large tires are to be unloaded, the aforementioned operations can be reversed to easily unload the large tires.

When loading or unloading a large tire, by rotating the operating handle of the height adjustment mechanism, the inner and outer tubes expand and contract to adjust the height of the luggage hanger onto the holding roller. It can be adjusted arbitrarily according to the size, and even during this adjustment work, the balancer spring is attached to the frame,
Since the load on the lower beam and the holding roller is borne, and the load on the threaded portion between the screw shaft and the nut portion is canceled, the rotation operation of the handle can be lightened.

At this time, due to the clearance between the inner and outer cylinders of the height adjustment mechanism, the inner cylinder shifts toward the center of gravity of the large tire, but the screw mechanism has its inner cylinder connected to the bracket with a pin so that it can swing freely. Therefore, this displacement movement can be followed, and it is possible to avoid applying an excessive twisting load to the threaded connection between the screw shaft and the nut member.

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

In Figures 1 to 9, 1 indicates front and rear wheels 1a and 1b.
A trolley that is self-propelled by an engine or motor, and has a driver's seat S formed on the front side, and
A deck 2 is formed behind the driver's seat S with sufficient space to load large tires W used in aircraft and the like.

In this embodiment, the ground height of the substantially rear half 2a of the deck 2 is lowered, and the deck 2 is formed into a multi-stage shape.
The large tires W are vertically stacked on the truck a along with a luggage hanger to be described later, and the lower side of the large tires W can be prevented from shifting forward by the deck stepped portion when the truck is braked.

Reference numeral 3 denotes a parallel link mechanism disposed on the rear end of the rear half 2a of the deck, which includes a support 5 that is rotatable by being supported by a bearing 4 provided at the center of the rear end of the rear half 2a of the deck; It consists of a pair of links 6 and 7 that are pivotally supported at the top and bottom, and an arm support shaft 8 that is connected with a pin between the free ends of these links 6 and 7, and the arm support shaft 8 is pivoted in the horizontal and vertical directions around the support 5. It is swingable.

Reference numeral 10 indicates a drive mechanism for vertically swinging the parallel link mechanism 3, and a bracket 11 provided at the bottom of the support column 5.
Hydraulic cylinder 1 with cylinder body 12a pivotally supported on
2, an arm 13 with one end connected to the upper part of the support column 5 with a pin and an operating rod 12b of a hydraulic cylinder 12 connected to the middle part and supported by the hydraulic cylinder 12, and a free end of the arm 13. It consists of a strut-type shock absorber 14 connected by a pin between the end and the end of the upper link 6 on the side where the arm support shaft 8 is connected, and transfers the extension/retraction force of the hydraulic cylinder 12 to the arm 13, Upper link 6 via buffer 14
This causes the parallel link mechanism 3 to swing up and down around the pillar 5.

Reference numeral 9 denotes a hanger arm that is horizontally rotatably attached to the arm support shaft 8 of the parallel link mechanism 3, and a luggage hanger 17 is rotatably suspended from the free end of the hanger arm.

This luggage hanger 17 has a hook pin 22 provided on a height adjustment mechanism 21 (described later) on the hanger arm 9.
It is engaged with a notch 9a at the free end of the holder and is detachably suspended, and is rotatable in the horizontal direction about the hook pin 22. Luggage hanger 17
is an inverted U-shaped frame 19 and this frame 19
A lower beam 19a is provided astride the lower end of the lower beam 19a, and a pair of holding rollers 20 are protruded from both ends of the lower beam 19a so as to be rotatable approximately horizontally in parallel to one side. It is designed so that a large tire W can be scooped up and placed on it.

Reference numeral 21 denotes a height adjustment mechanism disposed at the upper end of the frame 14 of the luggage hanger 13, and is provided at the side of the upper end of the frame 14 on which the holding roller 17 is protruded and is inclined diagonally upward. A pair of inner cylinders 2
5, 25, and a pair of outer cylinders 24 which are provided on the lower surface of the bracket 18, which has a hook pin 22 projecting from the upper surface thereof, and which are protruded obliquely downward and are externally fitted onto the inner cylinders 25, 25 so as to be able to slide and swing freely. , 24 and each of these inner cylinders 25
A balancer spring 27 is stretched between the outer cylinder 24 and the frame 19, the lower beam 19a, and the holding roller 20, and between the inner and outer cylinders 24, 25 and 24, 25 on both sides. A screw mechanism 26 is provided spanning the bracket 18 and the frame 19.

The screw mechanism 26 includes a screw shaft 28 rotatably supported on the upper end of the frame 19 and equipped with an operating handle 29 at the lower end, and an inner cylinder having a nut member 30 screwed onto the screw shaft 28 in the tip end. 31, an outer cylinder 32 fixed to the upper end of the frame 19 and containing the screw shaft 28 and slidably fitted into the inner cylinder 31, and an inner cylinder 32, which is fixed to the inner cylinder 31 and has inner and outer cylinders. 3
A cylindrical protective cover 3 that covers the mating parts of 1 and 32
1a.

The screw mechanism 21 has an upper end portion of the inner cylinder 31 loosely fitted onto a support shaft 33 protruding from the bracket 18, and is swingably connected to the shaft 33 by a pin 34.
This pin 34 is inserted and arranged from a slightly diagonal lateral direction, and when inserting and removing the pin 34, the outer cylinders 24 and 2 on both sides
This is done so that it does not interfere with 4.

As a result, by rotating the operating handle 29 and moving the nut member 30 along the screw shaft 28, the inner and outer cylinders 24 and 25 can be relatively extended.
Adjusting the height of the luggage hanger 17 by reducing the size, that is,
The height from the lower beam 19a to the bracket 18 can be adjusted.

In the figure, 39 is the bracket 18 of the height adjustment mechanism 19.
A holder 41 is attached to the lower side and is used to prevent the large tires W placed on the holding rollers 20 and 20 from falling over, and 41 is a tire holding frame attached to both sides of the trolley 1 to hold these tires. The frame 41 is also designed to be able to vertically mount and hold a large tire W. A pair of outriggers 43 are provided on each side of the truck 1 and are grounded during cargo handling operations.

According to the above embodiment structure, the luggage hanger 17
When transporting the large tire W held in the frame by running the trolley 1 to the destination, lowering it from the rear half 2a of the deck, and attaching it to the axle of an aircraft (not shown), for example, the hydraulic cylinder 12 must be slightly extended. When activated, the driving force is transmitted from the upper link 6 to the lower link 7 via the arm support shaft 8, and the upper and lower links 6,
7 upward at the same time, and the arm support shaft 8 is attached to the support column 5.
move vertically upward in parallel with

As a result, the luggage hanger 17 suspended by the hanger arm 9 is lifted together with the large tires W from above the rear half 2a of the deck, so that the parallel link mechanism 3 is manually rotated horizontally about the support 5, and the hanger Arm 9 to arm support shaft 8
If the baggage hanger 17 is rotated horizontally in the same way, for example, as shown in the eighth and ninth figures,
It can be moved to a predetermined position at the rear.

Therefore, the parallel link mechanism 3 and the hanger arm 9 can be rotated in the horizontal direction, and the luggage hanger 17 can be rotated in the horizontal direction.
The large tire W is brought to the side of the axle end of the aircraft (not shown) by horizontal rotation around the hook pin 22, and the cargo hanger 17 is moved around the large tire W by operating the hydraulic cylinder 12. By adjusting the center so that it is at the height of the axle end and pushing the luggage hanger 17 together with the large tire W toward the axle end, the large tire W can be easily moved to the axle end while being suspended. It can be fitted and installed.

Next, when removing the old large tire W from the axle, taking it into the luggage hanger 17, and loading it on the rear half 2a of the deck, do the same as described above on the luggage hanger 1.
7 to the side of the large tire W mounted on the axle, push the luggage hanger 17 toward the large tire W, and insert the pair of holding rollers 20, 20 under the large tire W. The luggage hanger 17 is moved slightly upward by the operation of the hydraulic cylinder 12, and these holding rollers 20, 20 are attached to the large tire W.
(See Figures 8 and 9).

Then, by unfastening the large tire W from the axle and moving the large tire W along with the luggage hanger 17 in a direction away from the axle, the large tire W can be scooped onto these holding rollers 20, 20, so that the large tire W can be scooped up onto these holding rollers 20, 20. All you have to do is reverse the process of installing the large tire W mentioned above, and fold the parallel link mechanism 3, hanger arm 9, and luggage hanger 17 compactly onto the rear half 2a of the deck using their connection points as nodes, and then attach the luggage. The hanger 17 can be stored in a state substantially parallel to the parallel link mechanism 3 (see FIGS. 1 and 2).

Similarly, when a large tire W stored vertically on the floor of a hangar or the like is taken into the luggage hanger 17 and loaded onto the rear half 2a of the deck, the luggage hanger 17 is lowered to near the floor. In the same way as described above, the large tire W stored vertically is brought to the side and pushed toward the large tire W, and the pair of holding rollers 20, 20 are applied to the circumferential side of the large tire W. If the hanger 17 is moved upward by the operation of the hydraulic cylinder 12, the large tire W can be scooped onto these holding rollers 20, 20. Parallel link mechanism 3 with horizontal rotation operation and hydraulic cylinder 12
By vertically swinging the large tires W together with the luggage hanger 17 can be loaded onto the rear half 2a of the deck.

On the other hand, the luggage hanger 17 is placed on the rear half 2a of the deck.
When the large tires W held and loaded are lowered onto the floor of a hangar or the like and stored vertically, the above-described tire loading operation may be reversed.

Furthermore, loading and unloading of large tires W onto the tire holding frames 41 extending on both sides of the trolley 1 is carried out in exactly the same manner as loading onto and unloading onto the rear half 2a of the deck described above. It can be done easily.

For example, when attaching or detaching a large tire W to the axle of an aircraft, the aircraft is close above the axle to which the large tire is attached, and there is little work space in the vertical direction, so the hanger arm 9 must be placed high. Therefore, it is necessary to use a luggage hanger 17 suspended from the hanger arm 9 that matches the size of the large tire W.
Before loading the large tire W onto the holding rollers 20, 20, the luggage hanger 17 adjusts its height by operating the operating handle 29 to extend and retract the height adjustment mechanism 21. It can be easily adjusted to the size of the large tire W to be installed on the tire 20.

At this time, attach the luggage hanger 17 to the hanger arm 9.
If the operating handle 29 is rotated while the handle is suspended from the balancer spring 27
Since the load on the threaded portion between the screw shaft 28 and the nut portion 30 can be canceled, the handle rotation operation can be lightened and the height adjustment work can be easily performed.

In addition, it is desirable that the luggage hanger 17 maintains a vertical state when loading and unloading large tires W, as well as when attaching large tires W to the axle of an aircraft, etc., but the height adjustment described above Mechanism 2
1 is arranged at an angle on the side where the holding rollers 20, 20 are disposed, and by expanding and contracting according to the size of the large tires W, _W1 , the frame 19 and below are fixed as shown in FIG. Hook the structure of
The combined center of gravity of the large tire W or W ₁ and the components below the frame 19 can be kept close to the center line of the hook pin 22 by moving it forward and backward with respect to the center line of the hook pin 22. The luggage hanger 17 can always be suspended vertically regardless of the size of the large tires W, _W1 .

On the other hand, when this luggage hanger 17 is suspended together with the large tire W, the inner and outer cylinders 2 and 2 of the height adjustment mechanism 21
Due to the clearance between the fitting parts 4 and 25, the inner cylinder 24 moves toward the center of gravity of the large tire W, but the screw mechanism 26 has its inner cylinder 31 swingably connected to the bracket 18 by a pin 34. This displacement movement can be followed, and the screw shaft 28 and the nut member 3
It is possible to avoid deformation or damage due to excessive twisting load acting on the threaded connection and connection portion.

Effects of the invention As described above, according to the invention, it is possible to easily transport heavy large tires to the destination by running a self-propelled trolley, and it is also possible to load and unload large tires in parallel. link mechanism,
Large tires can be easily loaded and unloaded by a single worker by horizontally rotating the hanger arm and luggage hanger and vertically swinging the parallel link mechanism by operating the drive mechanism. This makes it possible to save labor and speed up the work.

In particular, the parallel link mechanism rotates horizontally around the support, and the hanger arm rotates horizontally about the arm support axis of this parallel link mechanism, so the horizontal rotation of the parallel link mechanism and hanger arm moves the cart. The cargo hanger can be freely extended to the designated loading or unloading position for large tires, such as on the left and right sides of the deck, or in the front and rear directions, without any adjustment, making cargo handling operations even easier. be able to.

In addition, the luggage hanger is equipped with a height adjustment mechanism that tilts upward from the upper end of the frame to the side where the holding roller is installed, and by rotating the operating handle,
Adjust the height of the luggage hanger by expanding and contracting the inner and outer cylinders.
Since the size of the large tire to be taken into the holding roller can be arbitrarily adjusted, the lifting height of the luggage hanger by the hanger arm can be kept low and does not need to be made unnecessarily high.Therefore, the vertical work space can be saved. Can be made smaller.

Moreover, as mentioned above, the height adjustment mechanism is tilted on the side where the holding roller is installed, so that even if large tires of different sizes are taken in, the center of gravity of the luggage hanger will not shift. It is possible to perform stable cargo handling work by maintaining a vertical position.

Furthermore, in the screw mechanism of this height adjustment mechanism, the inner cylinder, which has a nut member in its tip into which the screw shaft on the frame side is screwed, is pivotally connected to the bracket connected to the hanger arm. When a large tire is loaded into a luggage hanger, even if the pair of inner cylinders on the frame side shift toward the center of gravity of the large tire with respect to the pair of outer cylinders on the corresponding bracket side due to the excessive weight, the screw mechanism It is possible to avoid applying an excessive twisting load to the threaded engagement and connection portion between the screw shaft and the nut member following the displacement movement, and it is possible to prevent deformation or damage to the screw mechanism.

[Brief explanation of drawings]

Fig. 1 is a plan view of one embodiment of the present invention, Fig. 2 is a side view of the same, Fig. 3 is a perspective view of the main parts, Fig. 4 is a cross-sectional view of the height adjustment mechanism, and Fig. 5 is a side view of the same. 4 is a sectional view taken along the - line in Fig. 4, Fig. 6 is a sectional view taken along the - line in Fig. 5, Fig. 7 is a side view of the luggage hanger, and Fig. 8 is a sectional view taken along the - line in Fig. 4.
9 are a plan view and a side view showing working conditions, and FIG. 10 is a perspective view showing a conventional lifter. 1...Dolly, 2...Deck, 3...Parallel link mechanism, 5...Strut, 6...Upper link, 7...
Lower link, 8... Arm support shaft, 9... Hanger arm, 10... Drive mechanism, 17... Luggage hanger, 18... Bracket, 19... Frame,
19a...Lower beam, 20...Holding roller, 2
1... Height adjustment mechanism, 22... Hook pin, 24
...Outer cylinder, 25...Inner cylinder, 26...Screw mechanism, 2
7... Balancer spring, 28... Screw shaft,
29... Operation handle, 30... Nut member, 3
1... Inner cylinder of screw mechanism, W... Large tire.

Claims (1)

[Scope of utility model registration request] A deck capable of loading large tires is formed at the rear of a self-propelled trolley that has a driver's seat on the front side, and a pair of links are pivotally supported at the top and bottom of a column rotatably supported on this deck. A parallel link mechanism in which an arm support shaft is connected with a pin between the free ends of these links so that it can swing freely in the horizontal and vertical directions around the column, and the column and upper link of the parallel link mechanism. A drive mechanism that swings the parallel link mechanism up and down, a hanger arm that is horizontally rotatable and connected to the arm support shaft of the parallel link mechanism, and a lower beam at the lower end of the inverted U-shaped frame. A pair of holding rollers are disposed astride the lower beam, and a pair of holding rollers are disposed to protrude substantially horizontally in parallel to one side of the lower beam. A luggage hanger that straddles and holds a large tire vertically is provided, and the luggage hanger includes a pair of luggage hangers that are provided at the upper end of the frame and project obliquely upward on the side where the holding roller is disposed. The bracket has an inner cylinder and a hook pin protruding from the upper surface to engage and disengage from a notch formed in the free end of the hanger arm. A pair of outer cylinders that can be freely fitted to the outside, a balancer spring that is stretched between the inner and outer cylinders and bears the load of the frame, lower beam, and holding roller, and inner and outer cylinders of each pair. A nut provided in the tip of an inner cylinder, which is disposed between the cylinders, is rotatably attached to the upper end of the frame, and has a screw shaft rotatably connected to the bracket with a pin, which is rotated by an operating handle at the lower end. A height adjustment mechanism consisting of a screw mechanism screwed into the member is provided, and the luggage hanger can be attached to and detached from the free end of the hanger arm via the hook pin of this height adjustment mechanism, and can be rotated in the horizontal direction. A large tire transport vehicle characterized by being connected.