JPS6229278B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement of a traveling leg with a lifting mechanism for a boarding bridge.

Conventionally, at airports, an elevating mechanism has been used in which the proximal end is swingably connected to the end of the building in the vertical and horizontal directions, and the vicinity of the tip of the movable passage body is made up of three or more multiple-fitting telescoping tubes. The movable passage body can be vertically swung by the lifting mechanism of the attached traveling legs, and the movable passage body can be moved laterally and back and forth by the traveling unit that swings and runs a set of two wheels that can be mutually reversed. The boarding bridge that looked like this was opened.

As an example of the traveling leg in this device, the vertical load due to the tunnel-like moving passage body is borne by a ball screw serving as an elevating mechanism provided between the traveling part and the passage body, and the bending load applied to the ball screw. The load was borne by telescoping tubes that were fitted in multiple layers at the top, middle, and bottom so as to surround the ball screw.

Therefore, when the running leg is shortened under normal conditions, the intermediate tube has its lower end supported by a ring-shaped stopper provided near the lower end of the lower tube, but when the running leg is extended to a certain extent, the intermediate tube is supported by the ring-shaped stopper provided near the lower end of the lower tube. By the engagement of the sliding ring provided at the upper tube with the stopper provided at the lower end of the upper tube, the upper tube moves upward together with the upper tube and is supported by the upper tube. Furthermore, when the movable passage body moves downward from the horizontal state, the intermediate tube also moves downward with the downward movement of the upper tube, and the ring-shaped stopper of the lower tube causes It is supported.

However, when the moving passage body is connected to a small aircraft and the traveling legs are in the downward tilted position, they are in the shortest position and are subjected to a large bending force, so the intermediate tube is subjected to a large frictional force through the sliding ring body. It is in a state equivalent to being connected to the upper tube. When the movable passage body is raised from this state to connect with a medium-sized or large-sized aircraft, if the frictional force is greater than the weight of the intermediate tube, the intermediate tube also rises as the upper tube rises, and the movable passage body becomes nearly horizontal. When the intermediate tube reaches a position where the bending force applied to the running legs is reduced, or when the state changes due to swinging or running of the running wheels, and the weight of the intermediate tube overcomes the frictional force, the intermediate tube will fall.

Therefore, a collision occurs between the ring body of the intermediate tube and the stopper of the upper tube, or a collision between the lower end of the intermediate tube and the ring-shaped stopper of the lower tube, which not only gives the operator a sense of anxiety due to the generation of abnormal noise, but also If the falling distance is large, damage to the equipment is inevitable.

In view of the above-mentioned current situation, the present invention provides a multi-fitting telescopic tube consisting of three stages of upper, middle, and lower parts near the tip of a movable passage body with the proximal end as a fulcrum, and a traveling leg with an elevating mechanism. In a boarding bridge in which a movable passage body can be vertically swung by a mechanism, a telescopic cylinder and an oil tank are disposed on the side of the upper tube of the multiple insertion telescopic tube, and one end of the telescopic cylinder is placed on the side of the upper tube. At the same time, the other end is connected to the intermediate tube side, and the upper and lower entrances and exits of the telescoping cylinder are connected to the oil tank, and a throttle with a check valve is provided on the return oil side from the telescoping cylinder to the oil tank when the intermediate tube is lowered. The object of the present invention is to reduce the descending speed of the intermediate tube when it falls by appropriately controlling the flow rate of only the return oil from the cylinder when the intermediate tube is lowered through a valve.
This concerns the running legs on the boarding bridge.

To explain in detail based on the embodiment shown in the figures, reference numeral 1 denotes a base rotating body which is appropriately supported by a support base 2 and arranged so as to be able to communicate with the inside of the airport terminal building 4 by a fixed passage body 3. 3, it is possible to swing the head by a slight angle in the left and right directions.

Reference numerals 5 and 6 designate movable passage bodies of the boarding bridge that are fitted together so as to be expandable and retractable. A cab 7 connected to an aircraft boarding gate is connected so as to be able to swing slightly in the lateral direction.

Reference numeral 8 denotes a traveling leg with an elevating mechanism that is suspended from the lower surface near the tip of the movable passage body 6, and is fitted with an elevating drive unit 9, which also serves as a connection to the movable passage body 6, in an overlapping manner so that it can expand and contract in the vertical direction. upper, middle, and lower tubes 10, 11, and 12; a ball screw 13 as a lifting mechanism driven by the lifting drive section 9;
Travel section 14 and fluid-based telescopic cylinder 15
It consists of etc.

The lift drive section 9 is configured to be able to transmit the rotation of the motor 16 with a speed reducer to the ball screw 13 (can be rotated forward or reverse) via a sprocket 17, a chain 18, and a sprocket 19 within the cover 9a.

Further, the upper tube 10 has its upper end connected to the cover 9.
Sliding ring bodies 11a and 11b connected to the lower part a and fixed to the upper end and intermediate part of the intermediate tube 11
A stopper 10 that engages with the lower ring body 11b to enable the intermediate tube 11 to be pulled up.
A is fixed at the bottom end. Further, the lower tube 12 is also provided with sliding ring bodies 12a and 12b similar to the aforementioned intermediate tube 11, and furthermore, a ring-shaped stopper 12c for the intermediate tube 11 is provided near the lower end.

Further, near the lower end of the intermediate tube 11, a semicircular plate 20 is provided so as to protrude toward the outer peripheral side, and
Two guide members 22 with key grooves are fixed so as to be slidably fitted with keys 21 provided at two locations on the outer periphery of the lower tube 12 to prevent rotation.

23 is a hollow prismatic guide fixed to the outer periphery of the upper tube 10 with an appropriate bracket; 24 is a prismatic column fitted into the prismatic guide 23 so as to be slidable in the vertical direction; It is guided by two sliding members 25 and 26 and two sliding members 27 and 28 fixed to the upper part of the prism 24 side.

The lower end of the prism 24 is connected to a pivot body 29, and the pivot body 29 moves the upper roller 30 of the two rollers 30, 31 vertically arranged on the lower side onto the semicircular plate 20. When engaged, the square column 2 is normally
4 is supported by a semicircular plate 20. Further, when the upper tube 10 is raised, the lower roller 31 is prevented from moving upward by the semicircular plate. Therefore, the pivot body 29 is provided near the lower end of the intermediate tube 11 so as to restrict its position in the vertical direction.

The ball screw 13 is connected to the upper tube 10.
and a lower tube 12 to enable the upper tube 10 integrated with the passage bodies 5 and 6 to move up and down, and the cylinder 15 for controlling the lowering speed of the intermediate tube has its upper end fixed to the cover 9a. Since it is pivotally connected to the connecting fitting 32, the pivot body 29 cannot rotate with respect to the upper tube 10. Further, the intermediate tube 11 and the lower tube 12 are made unrotatable by fitting the key 21 and the guide member 22 together. However, since the pivot 29 and the intermediate tube 11 are connected only with the roller 30 supported on the semicircular plate 20 as described above, the intermediate tube 11 can be freely connected to the upper tube 10. It can be rotated.

The traveling portion 14 is driven by driving sources provided within the axle cover 14a connected to the lower end of the lower tube 12, and the traveling wheels 33, 34 disposed at both ends thereof.
The wheels 33 and 34 can be rotated in the forward and reverse directions separately, so that the lower and intermediate tubes 12 and 11 are rotated to move the movable passage bodies 5 and 6 in the left and right directions. This makes it possible to expand and contract.

Further, the cylinder 15 has an upper entrance/exit 15b.
The lower inlet/outlet 15c is in direct communication with the oil tank 35 fixed appropriately near the cover 9a, and the lower inlet/outlet 15c is in communication with the oil tank 35 through a throttle valve 36 with a check valve so as to be able to control the speed only in the downward direction of the piston rod 15a. Even if the piston rod 15a tries to descend suddenly, the piston rod 15a and the pivot support 2
The lowering speed of the intermediate tube 11 can be controlled to a predetermined low speed through the rollers 9, the rollers 31, and the semicircular plate 20. In this case, it is of course possible to use an adjustable type throttle valve 36 if necessary.

The rotation of the ball screw 13 causes the upper tube 10 to move up and down, causing the movable passage bodies 5 and 6 to swing up and down. To,
The intermediate tube 11 rises together with the upper tube 10 due to frictional resistance through the ring bodies 11a and 11b.

The intermediate tube 11 falls due to a change in tube deflection due to its own weight or the operation of the running section 14 near the position where the frictional resistance is reduced (a state in which the amount of deflection of the running legs 8 is reduced) near the horizontal position of the passage bodies 5 and 6. However, the throttle effect of the throttle valve 36 acts to reduce the downward speed of the tube 11.

Since the throttle valve 36 allows oil to flow freely from the oil tank 35 through the check valve when the piston rod 15a moves in the shortening direction, it does not have any effect when the upper tube 10 and the intermediate tube 11 move relatively close to each other. Moreover, due to the relative separation movement due to the rise of only the upper tube 10, the lower inlet/outlet 15c side may become the return oil side, but in this case, if the throttling effect is too strong, the intermediate tube 11 will rise at the same time, Later, due to its own weight, it descends to a predetermined position at the same speed as the suppression speed in the abnormal fall state, and other functions are not adversely affected.

Note that the rotation range between the intermediate tube 11 and the upper tube 10 is such that a rotation command is given to the traveling section 14 using a detected value by an appropriate rotation angle detection device (not shown) provided between both tubes. , semicircular plate 20
The size is limited to within the range of the size of .

FIG. 5 shows a second embodiment. Components that are the same as those of the first embodiment shown in FIG. 2 are designated by the same reference numerals and explanations will be omitted, and different sections will be explained below.

Of the traveling legs 108 with lifting mechanism, 110, 11
Reference numerals 1 and 112 designate upper, middle, and lower tubes, and the middle and lower tubes are provided with sliding ring bodies 111a, 111b, and 112 in the same manner as in the first embodiment.
a, 112b are provided. The stopper 110a of the upper tube 110 also serves as a guide member for preventing rotation, and has two concave notches on the inner circumference to form a keyway. Although the tube 110 and the intermediate tube 111 are allowed to slide relative to each other, rotation is not possible. Accordingly, the piston rod 15a of the cylinder and the intermediate tube 111 are directly supported by a piston rod pivot support 129 fixed to the tube, which prevents horizontal rotation. Therefore, the traveling part 14
The rotation of the middle tube 111 and the lower tube 11
This is done between 2 and 2.

Although the above two embodiments have been described, in the above-mentioned configuration, the fluid-operated telescopic cylinder 15 may be pivoted so that the main body and the piston rod portion are upside down, or it may be provided between the intermediate tube and the lower tube. In addition, the multiple insertion telescopic tubes are not limited to three stages, but two intermediate tubes can be arranged in four stages, each using a fluid-driven telescopic cylinder provided for each intermediate tube in the manner described above to adjust the descending speed. A similar effect can be obtained by restricting . Furthermore, even in the case where there are two traveling legs disposed on both sides of the moving path body, it is possible to implement the present invention by providing the same configuration for each leg.

As detailed above, according to the device of the present invention, in an apparatus in which three or more multiple-fitting telescoping tubes are provided on the outer periphery of the elevating mechanism for bearing bending loads on the elevating mechanism of the running legs, each intermediate tube of these tubes is By providing a cylinder for each intermediate tube and linking it with the intermediate tube, and controlling the return oil circuit of the cylinder with a throttle valve equipped with a check valve when the intermediate tube moves in the downward direction, abnormal speeds caused by falling of the intermediate tube, etc. can be safely maintained at a predetermined level. Since the speed can be limited and there is no adverse effect during normal movement of the intermediate tube, damage to the equipment can be prevented by adding a simple configuration.

[Brief explanation of the drawing]

Figures 1 to 4 show the first embodiment, of which Figure 1 is an overall layout diagram, Figure 2 is an enlarged view of arrows A to A in Figure 1, and Figure 3 is an enlarged view of B in Figure 2. ~
B arrow cross-sectional enlarged view, Figure 4 is C ~ in Figure 3
5 to 7 show the second embodiment, FIG. 5 is a structural diagram of the main part corresponding to FIG. 2, and FIG. 6 is an enlarged cross-sectional view taken from D to D in FIG. 5. FIG. 7 is a sectional view taken along the line E to E in FIG. 6. In the figure, 5 and 6 are moving passage bodies, 8 is a traveling leg with a lifting mechanism, 10, 11, and 12 are upper, middle, and lower tubes, 15 is a telescopic cylinder using fluid, 15a is a piston rod, 15b is an upper entrance, and 15c is Lower entrance/exit, 20 is a semicircular plate, 21 is a key, 22 is a guide member with a key groove, 23 is a hollow prismatic guide, 24
is a prism, 29 is a pivot, 30 and 31 are rollers, 3
5 is an oil tank, and 36 is a throttle valve with a check valve.

Claims (1)

[Scope of Claims] 1. A multi-fitting telescoping tube consisting of three stages of upper, middle, and lower sections and traveling legs with an elevating mechanism are provided near the tip of the movable passage body with the proximal end as a fulcrum, and the elevating mechanism In the boarding bridge that enables the vertical movement of the movable passage body, a telescopic cylinder and an oil tank using fluid are arranged on the side of the upper tube, one end of the telescopic cylinder is connected to the upper tube side, and the other end is connected to the pivot support. A throttle valve with a check valve is provided on the return oil side from the telescopic cylinder to the oil tank when the intermediate tube is lowered, and the upper and lower entrances and exits of the telescopic cylinder are connected to the oil tank. The lower tube of the telescoping tube is made unrotatable by fitting a key and a guide member with a key groove that can slide vertically relative to the intermediate tube, and a hollow prismatic guide is provided on the side of the upper tube, and the hollow prismatic guide A square column is slidably fitted and the pivot body is connected to the lower part of the square column, and a semicircular plate is provided on the side of the intermediate tube so as to protrude horizontally, and is vertically opposed to the pivot body. 1. A running leg for a boarding bridge, characterized in that two rollers arranged as a pair of rollers are sandwiched and engaged with the semicircular plate. 2. A multi-fitting telescopic tube consisting of three stages (upper, middle, and lower) and a traveling leg with an elevating mechanism are provided near the tip of the movable passage body with the proximal end as a fulcrum, and the elevating mechanism moves the movable passage body up and down. In a boarding bridge that is capable of swinging, a telescopic cylinder and an oil tank are arranged on the side of the upper tube, one end of the telescopic cylinder is connected to the upper tube side, and the other end is connected to the pivot body. A throttle valve with a check valve is provided on the oil side returning from the telescoping cylinder to the oil tank when the intermediate tube is lowered to communicate the upper and lower inlet/outlet ports of the cylinder with the oil tank, and the intermediate tube of the multiple insertion telescopic tube is connected to the oil tank. The upper tube is made unrotatable by fitting a vertically slidable key and a guide member with a key groove, and the intermediate tube and the lower tube are made rotatable, and the pivot body is connected to the side part of the intermediate tube. A running leg on a boarding bridge characterized by.