JPH0233015A - Roller conveyer - Google Patents

Abstract

PURPOSE:To enable a telescopic motion to be performed holding a pitch to a fixed space further preventing a load from dropping and tumbling by providing a streak groove in the side surface of a frame cylinder, comprising a base cylinder and a sliding cylinder, while a coil spring in the frame cylinder and arranging a roller engaging its end with the coil spring, in the case of an in-out carrying roller conveyer. CONSTITUTION:A frame cylinder 2 can be telescopically actuated by a base cylinder 11 and a sliding cylinder 12, and the frame cylinder 2 provides in its hollow hole 5 a coil spring 6 to be arranged in a manner wherein it energize the frame cylinder 2 in its extending direction. A spherical end part 7A of a roller unit 7 is inserted to a streak groove 13 and engaged with the coil spring 6. A frame structure 3 is formed into a rectangular framed shape by the frame cylinder 2 and transverse frame members 10A, 10B, and the roller unit 7 is supported between the frame cylinders 2. By this constitution, when the coil spring is extended and contracted by sliding the sliding cylinder 12, a telescopic motion can be performed holding a pitch space. Accordingly, the improvement of reliability, smallness of size and the lightness of weight can be contrived.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention has a simple structure and can expand and contract while keeping the pitch interval between each roller body constant, and is particularly suitable for use as a conveyor for loading and unloading cargo. Regarding roller conveyors.

[Conventional technology]

For loading and unloading stations installed in factories, warehouses, etc., for example, as shown in FIG. By using A and connecting it to the loading platform of a freight vehicle that is subsequently attached to station B, loading and unloading of cargo W is facilitated.

[Problem to be solved by the invention]

However, such a pantograph-shaped link G has a complicated structure and has a high failure rate due to poor strength, lacks reliability, and increases costs. In addition to requiring a large size and increasing the size of the conveyor, there are also problems such as separation from the loading platform E during stacking and unloading operations, causing the cargo to fall or fall.

The present invention is based on engaging coil springs at both ends of the roller body, has a simple structure and high reliability, and can expand and contract while keeping the pitch interval between each roller body constant, thereby solving the above-mentioned problems. The purpose is to provide a roller conveyor that can be used.

[Means to solve the problem]

In order to achieve the above object, the roller conveyor of the present invention has the following features:
A frame body comprising a base tube and a sliding tube that is telescopically and loosely fitted into the base tube and forming a hole connected to the base tube, and has a frame tube arranged in parallel, on the side facing the frame tube, A groove is formed that is continuous and communicates with the hole, and a coil spring is provided in the hole for biasing the frame tube in a direction to extend, while both ends engage with the coil spring between the frame tubes. , the two ends span a plurality of roller bodies that move along the grooves due to the expansion and contraction of a coil spring associated with the frame tube.

[Effect]

The roller conveyor configured in this manner can uniformly compress the coil spring housed inside the base cylinder as the base cylinder contracts. Therefore, the roller body that is spanned by engaging the coil spring at both ends can compress the coil spring uniformly. Due to compression, they can be moved in parallel along the grooves while keeping their pitch intervals constant.

In this way, the roller conveyor moves the roller body in parallel only by the expansion and contraction of the coil spring associated with the base cylinder, so its structure is extremely simple, and it is highly reliable as it does not cause breakage or the like.

Further, the coil spring does not undergo dimensional changes other than in the longitudinal direction, such as changes in diameter, and is therefore useful for reducing the size and weight of the roller conveyor.

〔Example〕

An embodiment of the present invention will be described below based on the drawings.

In FIGS. 1 to 3, a roller conveyor 1 is provided with a coil spring 6 in a hole 5 of a frame 3 having a telescopic frame 2, which biases the cough frame 2 in a direction to extend the frame. A plurality of roller bodies 7... whose both ends 7A engage with the coil spring 6 are bridged between the rollers 2 and 2.

The frame body 3 has a rectangular frame shape in which both ends of frame tubes 2 arranged parallel to each other with a gap are connected by horizontal frame members 10A and IOB, and the frame tube 2 is formed from a base tube 11 and a sliding tube 12. be done.

In this example, the base cylinder 11 is made of square steel tube with a rectangular cross section, and when the internal cavity 5A is opened at both ends, the base cylinder 11 has inner surfaces facing each other that communicate with the cavity 5A. A groove portion 13A extending continuously and horizontally along the longitudinal direction is provided transparently over the entire length thereof. In this example, the groove portion 13A is formed to be displaced upward in order to prevent collision between the roller body 7, the horizontal member 19, and the stopper 20, which will be described later.

Furthermore, the sliding tube 12 has the same structure as the tube 11, and has the following features:1. The cavity 5B is fitted loosely and expandably into the cavity 5A, and the interior cavity 5B is opened at both ends.
The holes 5 of the frame cylinder 2 are formed in cooperation with the hole portion 5A and are connected to each other. Further, the sliding tube 12 has a circular groove portion 13B on its inner surface at a height position overlapping with the groove portion 13A.
are transparent over the entire length, and the grooves 13A, 13B
Thus, the grooves 13 of the frame tube 2 communicating with the holes 5 are continuously formed.

In addition, each outer end of the base tube 11 and the sliding tube 12 forming the telescopic frame tube 2 is closed by a joint plate 15.16. The frame body 3
is formed.

The frame body 3 also includes a horizontal bar member 19 connecting between the inner ends of the base tube 11.
The rigidity of the horizontal member 19 is increased by
A stopper 20 is provided between the horizontal frame members 10B, and the stroke width of the expansion and contraction is regulated.

The stopper 20 has one end fixed to the horizontal frame body 10</b>B and slidably penetrates the horizontal frame member 19 to close the frame 11 .
The frame body 3 is provided with a stopper shaft 22 extending parallel to the frame member 12 and having a nut fitting 21 screwed onto the other end thereof, and the frame body 3 is moved from the extended position where the nut fitting 21 and the horizontal frame member 19 contact each other to the horizontal frame member 19 and the horizontal frame member 10.
It can freely expand and contract up to the contracted position where it comes into contact with B.

Further, a coil spring 6 is housed in the frame body 3 in the hole 5 of the frame tube 2, which biases the frame tube 2 in the direction of expansion.

In this example, the coil spring 6 is a compression spring wound spirally at equal pitches, and is formed into a long body spanning the entire length between the joint plates 15 and 16, and is substantially inscribed in the hole 5. As a result, the frame cylinder 2 can be
It can expand and contract uniformly. Note that the coil spring 6 may be formed into a longer length by connecting relatively short compression springs through partition walls.

Further, between the frame tubes 2.2, a plurality of roller bodies 7 whose both ends 7A engage with the coil springs 6 are installed parallel to each other and at right angles to the frame tube 2 at equal pitch intervals P.

In this example, the roller body 7 includes a base shaft 25 whose both ends 7A are loosely fitted into the grooves 13, and a cylindrical strip roller piece 26 rotatably supported on the base shaft 25. The diameter and the height position at which the grooves 13 are formed are set so that the grooves 13 exceed the upper surface of the frame 3. Note that the horizontal bar material 19,
The stopper 20 is provided below the roller body 7 to prevent contact with the roller body 7.

Further, the roller body 7 can be secured to the coil spring 6 by inserting both ends 7A of the base shaft 25 across the winding pitch of the helically wound coil spring 6.
According to the expansion and contraction of the roller bodies 7, the roller bodies 7 can move in parallel along the grooves 13 while keeping the respective pitch intervals P constant.

In this example, the grooves 13 act as guide grooves for guiding the roller body 7, and also bear the load when the load W is placed.

Further, in this example, the roller body 7 is formed of the base shaft 25 and the roller piece 26, so that the rotational movement of the conveyance surface of the roller body 7, that is, the outer circumferential surface of the roller piece 26 is made smooth. The base tube 11 and the sliding tube 12 may be made of cylindrical steel in addition to square tube steel. Furthermore, as shown in FIG. One flange portion 2 of the combined channel steel 29 having a U-shaped cross section
9A may be connected intermittently by wall plates 30 (in this case, continuous grooves 13 are formed by gaps between the other flange portions 29B).

Further, another actual example of the roller conveyor 1 is disclosed in m 5 = 6 m.

In the figure, the roller conveyor 1 has one end fixed to a joint plate 16 that closes the outer end of the rR moving cylinder 12 in a hole 5 of a telescopic frame cylinder 2, and a joint that closes the outer end of the base %'Jll. A guide shaft 36 to which a nut fitting 35 is screwed is disposed at the other end that slidably penetrates the plate 15, and a short compression spring piece 37 is attached to the engagement piece 39 on the guide shaft 36. The coil spring 6 connected via the is extrapolated.

As shown in FIG. 6, the engagement piece 39 has a cylindrical base body 41 into which the guide shaft 36 is loosely fitted through its center hole 40, and seating parts 42 for holding the ends of the compression spring piece 37 at both ends thereof. To protrude. Further, the engagement piece 39 has a projection 46 extending from the base body 41 and having a hole 45 that is perpendicular to the center hole 40 and opens inward.
By inserting A, the engaging piece 39 holds the roller body 7.

Therefore, the roller body 7 is engaged with the coil spring 6 via the engagement piece 39, and can move in parallel along the groove 13 while keeping the pitch intervals P constant relative to each other in accordance with the expansion and contraction of the coil spring 6. In this example, by extrapolating the coil spring 6 to the guide shaft 36, it is possible to prevent the coil spring 6 from waviness during compression without inscribing it in the frame cylinder 2, and to achieve smooth expansion and contraction. 6 can be formed to have a smaller diameter, and further miniaturization and weight reduction of the roller conveyor 1 can be promoted.

Further, the guide shaft 36 also functions as a stopper, and the extension end position of the frame tube 2 is regulated by the rotation of the nut fitting 35 and the connecting plate 15.

In addition, the joint plate 15 has a bent portion 15B extending outward from a base portion 15A that closes the outer end of the base tube 11, and a roller having the same structure as the roller body 7 is provided at the tip of the bent portion 15B. 47 is pivoted. By extending the bent portion 15B in this manner, the outer end of the guide shaft 36 that protrudes from the base portion 15A during contraction can be prevented from protruding from the roller conveyor 1, reducing the occurrence of accidents and increasing safety.

FIG. 7 shows an example of the use of the roller conveyor 1 of the present invention.

As shown in the figure, the roller conveyor 1 is installed with its inner end adjacent to another fixed conveyor C and its outer end protruding from the wall surface B1 of the loading/unloading stage gin B. Since the roller conveyor 1 is elastic and biased in the direction of extension, when the freight vehicle with its rear gate lowered moves backward to a position close to the rubber-like damper bar on the wall B1, the loading platform E is moved onto the roller conveyor. 1 and can be easily and reliably connected without separation. (Furthermore, Fig. 7 shows the state in which the freight vehicle is moving backward.) Therefore, it is possible to simplify the operation of driving the freight vehicle back to station B, prevent collisions with station B, and streamline the connection work. sell.

Furthermore, there is no separation between the loading platform E and the roller conveyor L during stacking and unloading work, which contributes to the safety of the work.Also, when the conveyor L expands and contracts, the pitch of each roller can be maintained constant. Therefore, it becomes possible to carry out stable transportation of the cargo W.

〔Effect of the invention〕

As mentioned above, in the roller conveyor of the present invention, both ends of the roller body that spans between the expandable and contractible frames are engaged with coil springs arranged in the holes of the frames, so that the roller conveyor of the present invention When the roller body expands and contracts, the pitch intervals between the roller bodies can be maintained constant.Also, since the pitch intervals are maintained only by the expansion and contraction of the coil springs, the structure is extremely simple and the reliability is high. It also helps improve
Furthermore, it can produce many effects such as making it possible to make the roller conveyor smaller and lighter.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing one embodiment of the present invention, FIG. 2 is a side view thereof, FIG. 3 is a sectional view thereof, and FIG. 4 is a perspective view showing a part of another embodiment of the frame cylinder. 5 and 6 are a plan view showing another embodiment of the present invention and a perspective view showing an enlarged portion thereof, FIG. 7 is a line diagram showing an example of use of the present invention, and FIG. 8 is a conventional technique. FIG. 2...-frame tube, 3... frame body, 5...- hole, 6-
2. Coil spring, 7-. Roller body, 7A... End portion, 11... Base tube, 12... Sliding tube, 13-.
groove.

Claims (1)

[Claims] 1. A frame body consisting of a base tube and a sliding tube that is telescopically and loosely fitted into the base tube and forming a hole connected to the base tube, and that has a frame tube arranged in parallel, on the side surface facing the frame tube. , a groove is formed that is continuous and communicates with the hole, and a coil spring is provided in the hole for biasing the frame tube in a direction to extend, while both ends thereof are engaged with the coil spring between the frame tubes. Also, a roller conveyor constructed by spanning a plurality of roller bodies whose both ends move along the grooves due to the expansion and contraction of a coil spring associated with the frame cylinder.