JP4388842B2 - Swing bucket support device - Google Patents

Description

  The present invention relates to a centrifuge used to separate various sample components and a swing bucket used in the centrifuge. Particularly, a large number of tubes can be mounted at a time, and a tube having a long neck is also used. It is an object of the present invention to provide a swing bucket support device that can be used and a swing bucket used in the swing bucket support device.

As is well known, a centrifuge is configured to place a sample-containing tube on a rotor and rotate the rotor at a high speed to separate a material by centrifugal force.
A multi-use rotor that can be used by exchanging a plurality of angles, swings, horizontals, 0.2 ml PCR 8-series tube buckets, etc. inside the rotor with one type of rotor is disclosed in Patent Document 1, Patent Document 2, Patent Document 3, This is proposed in Patent Document 4.
Further, Patent Document 5 has been proposed as a method for accommodating different types of angle rotors inside a cylindrical rotor.

All of the centrifuges disclosed in these patent documents 1 to 4 adopt a structure in which a load generated by a centrifugal force applied to a bucket is pressed against an inner peripheral surface of a rotor on a cylinder to support the load.
Japanese Utility Model Publication No. 6-11113 Japanese Patent Laid-Open No. 2003-311884 Japanese Utility Model Publication No.57-20269 JP 2001-129436 A

In the case of applications using a swing bucket in a cylindrical rotor, the structure for holding the swing bucket has been proposed in Patent Document 1 and Patent Document 2 described above, but it can be mounted at once by a centrifuge user. Requests have been made to increase the number of samples.
To increase the number of samples that can be centrifuged at a time, the number of swing buckets mounted inside the rotor is increased from 4 to 6 as described in FIGS. There are ways to increase it.
However, according to the structure disclosed in Patent Document 2, if a tube having a long cap portion from the neck of the tube is used due to the structure in which the arm is extended from the center of the rotor to support the swing bucket, the tip of the tube is Interference with the arm causes a phenomenon in which the tube cannot swing freely, resulting in inconvenience that the tube having a long cap portion from the neck cannot be used.

This problem can be solved by increasing the diameter of the rotor or reducing the number of tubes accommodated in the swing bucket to a number that does not interfere.
However, when the diameter of the rotor is increased, the moment of inertia of the rotor increases, resulting in a disadvantage that the time required for acceleration and deceleration of the rotor becomes longer. Further, reducing the number of pieces accommodated in the swing bucket is against the user's request.
In addition, since the swing bucket is conventionally manufactured by cutting from a metal block, the manufacturing cost is high, which imposes an economic burden on the user.
An object of the present invention is to propose a structure of a swing arm and a swing bucket that avoids interference between the swing buckets and between the tube and the arm and does not increase the moment of inertia without reducing the number of tubes to be accommodated. is there. Another object of the present invention is to propose a swing bucket having a structure that can be manufactured at low cost.

  According to the first aspect of the present invention, one open end of the cylindrical portion is closed to form a bottom surface, and a plurality of swing buckets are rotated inside the rotor driven by a drive shaft connected to the center of the bottom surface. Is a swing bucket support device that supports swinging freely, and is formed of a thin member having an outer diameter slightly smaller than the inner diameter of the cylindrical portion constituting the rotor and a length slightly shorter than the axial length of the rotor An annular drum, a swing arm projecting in a triangular prism shape from the inner wall surface of the annular drum toward the center of the annular drum, and disposed substantially equidistantly on the inner wall surface of the annular drum, and adjacent to each other. A plurality of grooves formed between them and having a width slightly wider than the width of the swing bucket to be supported, and a swing arm projecting toward the center of the ring drum of the swing arm Suggest swinging bucket supporting device including a circular space formed inside the circular arc connecting the projecting ends.

According to a second aspect of the present invention, in the swing bucket supporting device according to the first aspect, the plurality of swing arms open toward the opening end of the rotor at substantially the same position in the axial direction of the annular drum, The swing arms that communicate from the upper surface to the side surface and that are adjacent to each other and that have opposing swing arms have the same axis, and engage the trunnion pin that protrudes from the swing bucket into the engagement groove. A swing bucket support device is proposed in which a swing bucket is supported in a space formed between them.
According to a third aspect of the present invention, in the swing bucket support device according to the first aspect, the trunnion pin is passed between the plurality of swing arms so that the shaft cores coincide with each other at substantially the same position in the shaft core direction of the annular drum. A swing bucket support device is proposed in which each trunnion pin is fixed to each swing arm.

According to a fourth aspect of the present invention, in any one of the swing bucket support devices according to the first to third aspects, each of the non-mounting surfaces of the swing arm of the thin member constituting the annular drum is substantially parallel to the axis of the annular drum. A swing bucket support device having a structure provided with a kerf is proposed.
According to a fifth aspect of the present invention, in any of the swing bucket support devices according to the first to fourth aspects, a positioning plate having irregularities in the circumferential direction is laminated and mounted on the bottom plate constituting the rotor, Engaging means that engages with the irregularities formed on the positioning plate is formed on the bottom surface. The engaging means and the irregularities formed on the positioning plate are engaged with each other, and the position in the rotation direction of the annular drum is set to the rotor. A swing bucket support device is proposed, which is fixed to the device.

According to claim 6 of the present invention, swinging bucket to be mounted on either of the swing bucket supporting apparatus according to claim 1 or 2, 4 and 5, wherein the belt-like high-strength metal sheet bent into a U-shape, U-shape The outer sides of the pair of plate surfaces bent in the direction are held at a distance slightly smaller than the opposing distance of the swing arm, and the pair of bent pieces arranged in parallel to each other are connected to each other. In the vicinity of the connecting plate, the plurality of tube support holes formed on the plate surface of the connecting plate, and the bent portions of the pair of bent pieces, the plate surfaces of the pair of bent pieces penetrate substantially perpendicularly, and both ends are paired. a predetermined amount projecting from the outer surface of the bent piece of, is constituted by welding-ordered trunnion pins on each of the pair of bent pieces.

According to claim 7 of the present invention, swinging bucket to be mounted on either of the swing bucket supporting apparatus according to claim 1 or 3, 4 and 5, wherein the belt-like high-strength metal sheet bent into a U-shape, U-shape The outer sides of the pair of plate surfaces bent in the direction are held at a distance slightly smaller than the opposing distance of the swing arm, and the pair of bent pieces arranged in parallel to each other are connected to each other. A position where the connecting plate, a plurality of tube support holes formed in the plate surface of the connecting plate, and the pair of bent pieces are cut away from the free end sides of the connecting plate toward the connecting plate, and the end is close to the back surface of the connecting plate is a groove width is constituted by a slightly larger cutout groove than the diameter of the trunnion pins.

According to the swing bucket support device proposed in claim 1 of the present invention, since a plurality of triangular swing arms are mounted on the inner wall of the annular drum formed of a thin member, the plurality of swing arms are formed of a thin member. The annular drum is integrally supported, and can be easily attached to and detached from the rotor.
However, since the annular drum is made of a thin member during centrifugation, it easily deforms elastically, and during high-speed rotation, the load of the swing arm supported by the annular drum is received by the inner wall of the rotor, so that it can be safely separated. Processing can be performed.
In particular, according to the first aspect of the present invention, the swing arm is formed in a triangular prism shape, and the triangular column swing arm is mounted on the inner wall surface of the annular drum at equiangular intervals. A circular space surrounded by an arc connecting the protruding end portions of the swing arm is formed. That is, since the swing arm does not have an arm at the center, the arm, the swing bucket, and the tube attached to the swing bucket and the arm do not interfere with each other.

Therefore, a tube having a longer upper part than the neck can be used by being attached to the swing bucket, and there is an advantage that the number of tubes mounted on the swing bucket can be reduced without increasing the diameter of the rotor.
Further, according to the swing bucket support device and swing bucket proposed in claim 2 and claim 6 of the present invention, if the trunnion pin protruding from the swing bucket is dropped into the groove formed in the swing arm, the swing bucket is attached to the swing arm. can do. Therefore, a centrifuge that can be easily handled can be provided. Further, according to the swing bucket support device and the swing bucket proposed in claim 3 and claim 7 of the present invention, the kerf formed in the swing bucket is merely engaged with the trunnion pin passed between the swing arms. Since the swing basket can be attached to the swing arm, a centrifuge that can be easily handled can be provided in this case as well.

Furthermore, since the swing bucket proposed in claims 6 and 7 is formed by bending a high-strength metal plate into a U-shape, it can be provided at a lower price than a swing arm by conventional cutting.
Further, according to the centrifuge proposed in claim 3 and the swing bucket proposed in claim 7, the trunnion pin is provided on the swing arm side, so that the swing bucket can be manufactured at a lower cost.

1 to 8 show a first embodiment of a swing bucket support device according to the present invention. In the figure, 100 is a swing bucket support device according to the present invention, 200 is a rotor that rotates the swing bucket support device 100 at high speed (see FIG. 3), and 300 is a swing bucket that is swingably supported by the swing bucket support device 100 (FIG. 4). FIG. 5 and FIG. 8).
As shown in FIG. 3, the rotor 200 includes a cylindrical portion 201, a bottom plate 202 that covers one opening end surface of the cylindrical portion 201, a metal cover 203 that covers the outer peripheral surface of the cylindrical portion 201 and the outer surface of the bottom plate 202. The case where it comprises with the center member 204 with which the center position of the baseplate 202 was mounted | worn is shown. In this structure, the rotor 200 can be reduced in weight by forming the cylindrical portion 201 and the bottom plate 202 with a resin material reinforced with, for example, carbon fiber. In particular, the lighter rotor 200 can be manufactured at low cost by adopting a method of cutting and manufacturing the cylindrical portion 201 from a pipe formed of a resin material reinforced with fibers. A motor shaft (not shown) protruding from the centrifuge is connected to the central member 204, and the rotor 200 is rotated at a high speed by the motor.

The swing arm support device 100 according to the present invention is placed on the bottom surface of the rotor 200 described above and rotates integrally with the rotor 200.
A swing bucket support device 100 according to the present invention includes an annular drum 101 formed of a thin member as shown in FIGS. 1 and 2, and a triangular prism-shaped swing arm 102 mounted on the inner wall surface of the annular drum 101 at predetermined angles. And is configured. The annular drum 101 can be formed by, for example, rounding a belt-shaped body formed of a resin material reinforced with carbon fibers into a circular shape or cutting out from a resin pipe reinforced with fibers. The length L of the annular drum 101 in the axial direction (see FIG. 2) is selected to be smaller than the depth dimension M of the rotor 200 (FIG. 3). Further, the outer diameter D of the annular drum 101 is selected to be smaller than the inner diameter of the rotor 200. By selecting the outer diameter D of the annular drum 101 to be smaller than the inner diameter of the rotor 200 as described above, the work of attaching and detaching the swing bucket support device 100 to the rotor 200 can be easily performed, and the centrifugal operation is performed at the time of centrifugal separation. The annular drum 101 is extended by the force and is held against the inner wall surface of the rotor 200.

Swing arms 102 are attached to the inner wall surface of the annular drum 101 at predetermined angular intervals. In this embodiment, six swing arms 102 are mounted, and six grooves 103-1, 103-2,... 103- are provided while these six swing arms 102 face each other. The case where 6 is formed is shown.
As shown in FIG. 1, the swing arm 102 has a substantially triangular prism shape. One side 104 of the triangular prism protrudes from the inner wall surface of the annular drum 101 by a predetermined amount N (FIGS. 1 and 2), and the bottom surface of the triangular prism is the lower end of the annular drum 101. It is arranged so as to coincide with the opening surface. The direction of the extending direction of the projecting side 104 is parallel to the axis of the annular drum 101. The protruding amount N of the protruding side 104 from the inner wall surface of the annular drum 101 is selected to be larger than the swing radius R (FIG. 2) of the outermost peripheral portion of the swing bucket 300 supported by the swing arm 102.

One surface of the triangular prism that looks at the protruding side 104 is an arc surface, and this arc surface is attached to the inner wall surface of the annular drum 101. The other two surfaces in contact with the arc surface are flat surfaces. These two planes form mutually parallel planes between the swing arms 102 adjacent to each other, and form grooves 103-1 to 103-6 sandwiched between the parallel planes. The shape of the triangular prism of the swing arm 102 is determined so that the width W1 (FIG. 1) of the grooves 103-1 to 103-6 is slightly larger than the width W2 of the swing bucket 300 shown in FIG.
In this embodiment, the trunnion pin groove 105 is formed in the upper part of the swing arm 102 on the protruding side 104 side (position higher than the above-described swing radius R from the lower end side of the annular drum 101). The trunnion pin groove 105 is provided with a pair of trunnion pin grooves having the same axial center with each other adjacent swing arms 102. That is, each swing arm 102 has a trunnion pin groove 105 bent in a U-shape with a line C (FIG. 1) passing through the center of the annular drum 101 and a position where the arc surface of the swing arm 102 is divided into two as a line symmetry. The trunnion pin grooves that are formed and adjacent to each other across the grooves 103-1 to 103-6 of the bent trunnion pin groove 105 are aligned with each other.

The trunnion pins 301 projecting on both sides of the swing bucket 300 are inserted into the trunnion pin grooves 105 with which the axes match, and the swing bucket 300 is supported in a swingable state inside each of the grooves 103-1 to 103-6. The trunnion pin groove 105 is inclined toward the outer periphery of the annular drum 101 from the opening on the upper surface toward the bottom of the groove, so that the trunnion pin 301 is not detached from the trunnion pin groove 105 due to centrifugal force. It is composed.
The swing arm 102 is formed of two materials. That is, the portion 106 (FIG. 2) forming the trunnion pin groove 105 is formed of a high-strength metal material such as titanium, and the other portion 107 (FIG. 2) is formed of a resin material reinforced with carbon fiber, for example. By limiting the portion 106 formed of a metal material to a range as small as possible (a range in which a desired strength can be obtained) and increasing the number of portions 107 formed of a resin material as much as possible, the entire swing bucket supporting device 100 The weight can be reduced. In addition, since only the compressive force is mainly applied to the resin material portion 107 during the centrifugal separation operation, a sufficient strength can be obtained even if the resin portion is large.

  As shown in FIG. 6, a plurality of slits S1 to S3 are formed at positions facing the grooves 103-1 to 103-6 of the annular drum 101 as needed. The longitudinal direction of the slits S <b> 1 to S <b> 3 is formed in a direction parallel to the axial direction of the annular drum 101. By forming the slits S <b> 1 to S <b> 3, the annular drum 101 is easily extended, the annular drum 101 is extended while the rotor 200 is rotating at a relatively low speed, and the circular arc surface of the swing arm 102 is annularly rotated at a low speed. The load applied to the swing arm 102 can be brought into contact with the inner wall surface of the rotor 200 and can be shifted to a stable state where the load is received by the inner wall surface of the rotor 200.

As shown in FIG. 7, a positioning plate 205 having irregularities in the circumferential direction is laid on the bottom surface of the rotor 200. That is, the positioning plate 205 is fixed to the bottom plate 202 of the rotor 200 sandwiched by with central member 204 between the central member 204 and the bottom plate 202 as shown in FIGS. 3 and 5. The positioning plate 205 has a U-shaped groove 205A and a side 205B that forms a hexagon. The U-shaped groove 205A and the side 205B engage with the bottom surface of the swing bucket support device 100, and the swing bucket support device. The position in the rotational direction of 100 is fixed. This is shown in FIG. 7A shows a protrusion formed on the bottom surface of the swing arm 102, and 102B shows a step portion formed on the bottom surface of the swing arm 102. FIG. The protrusions 102A formed on the bottom surfaces of the six swing arms 102 attached to the annular drum 101 are engaged with the U-shaped grooves 205A of the positioning plate 205, and the step portion 102B is engaged with the side 205B. Accordingly, the swing bucket support device 100 is prevented from rotating with respect to the rotor 200 and the position in the rotational direction is fixed. Accordingly, the protrusion 102A and the stepped portion 102B constitute an engaging means for the positioning plate 205.

  Next, the swing bucket 300 mounted on the swing bucket support device 100 described above will be described. 8A is a plan view of the swing bucket 300, FIG. 8B is a side view thereof, and FIG. 8C is a cross-sectional view taken along the line CC ′ shown in FIG. 8A. A swing bucket 300 shown in FIG. 8 includes a pair of bent pieces 302A and 302B obtained by bending a band-shaped high-strength metal plate, for example, a titanium plate, into a U shape, and bending the U shape into a pair of these bent pieces 302A, A trunnion pin that penetrates the connecting plate 303 that connects 302B, the tube support hole 304 formed in the connecting plate 303, and the bent pieces 302A and 302B, and whose both ends protrude from the outer surfaces of the bent pieces 302A and 302B. 301 is shown. The trunnion pin 301 is also made of a high-strength metal material, and can be made of titanium like the bent pieces 302A and 302B and the connecting plate 303. The trunnion pin 301 passes through the bent pieces 302A and 302B at a position in contact with the thick surface of the connecting plate 303 and is welded to the bent pieces 302A and 302B. Reference numeral 305 denotes a welded portion.

The corner portions 306 (FIG. 8C) on the free end sides of the bent pieces 302A and 302B from the center of the trunnion pin 301 determine the maximum swing radius R, and based on this swing radius R, the protruding side 104 of the swing arm 102 The protrusion amount N and the position of the trunnion pin groove 105 are determined.
The swing bucket 300 shown in FIG. 8 is mounted on the swing bucket support device 100 shown in FIGS. 1 to 5, and the rotor 200 is rotated so that the swing bucket 300 has bent pieces 302A and 302B around the trunnion pin 301. A tube (not shown) that rotates toward the annular drum 101 and is supported by the tube support hole 304 is maintained in a horizontal posture. This state is shown in FIG. An annular space is secured between the surface surrounded by the connecting plate 303 and the central member 204. In this situation, when the swing bucket support device 100 is taken out from the rotor 200 and viewed, a circular space is formed on the inner side surrounded by the connecting plate 303. Accordingly, there is no arm or the like protruding from the center member 204 inside the connection plate 303, so that even if a tube protruding from the connection plate 303 is supported by the tube support hole 304, the head portion of the tube remains the center member. 204 does not interfere. That is, since the swing arm does not protrude in the radial direction from the central member 204, even a tube having a long head can be safely centrifugally driven.

A second embodiment of the present invention is shown below in FIG. In the second embodiment of the present invention, a plurality of triangular prism-shaped swing arms 102 are mounted on the inner wall of the annular drum 101, and a trunnion pin 301 is interposed between the swing arms 102.
That is, the trunnion pin 301 is passed over the grooves 103-1 to 103-6 formed between the swing arms 102, and the swing bucket shown in FIGS. 14A, 14B, and 14C is passed to the passed trunnion pin 301. 300 is implemented.
In the second embodiment, notches 307 (see FIG. 14B) are formed in the bent pieces 302A and 302B that constitute the swing bucket 300 from the respective free end portions of the bent pieces 302A and 302B toward the connecting plate 303. , And a trunnion pin 301 inserted and supported between the swing arms 102 is inserted into the notch groove 307, and the swing bucket 300 is rotatably supported by each trunnion pin 301.

Also in this case, the swing bucket 300 and the trunnion pin 301 are made of a high-strength metal material such as titanium, and the interval W2 (FIG. 12) between the outer surfaces of the bent pieces 302A and 302B is between the swing arms 102. The size is selected to be smaller than the width W1 (FIG. 9) of the grooves 103-1 to 103-6 formed in the groove 103-1, and the swing bucket 300 can be freely rotated inside the grooves 103-1 to 103-6. .
Also in this embodiment, as shown in FIG. 10, in the swing arm 102, the portion 106 that supports the trunnion pin 301 is made of a high-strength metal material, and the other portion 107 is made of resin reinforced with fibers. With this configuration, the weight of the swing bucket support device 100 can be reduced, and a centrifugal separator that has a short start-up time and a short braking time can be provided along with the weight reduction of the rotor 200.

Further, according to the second embodiment, since the swing bucket 300 does not include the trunnion pin 301, the manufacturing cost of the swing bucket 300 can be reduced. As a result, when it is necessary to prepare a wide variety of swing buckets depending on the tube shape or the like, the user's economic burden can be reduced.
Further, the swing bucket 300 used in the second embodiment has a structure in which the swing bucket 300 is mounted by inserting the trunnion pin 301 into the notch groove 307, so that there is no possibility that the swing bucket 300 may be activated with a poor mounting posture. That is, if it is confirmed until the trunnion pin 301 is inserted into the notch groove 307, the swing bucket 300 will inevitably fall to the proper mounting position if the hand is released from the swing bucket 300 thereafter. Therefore, handling can be performed easily.

  The swing bucket support device and the swing bucket according to the present invention can be used for a centrifuge having a short start-up time and braking time.

The top view for demonstrating 1st Embodiment of the swing bucket support apparatus of this invention. Sectional drawing on the AA 'line shown in FIG. Sectional drawing for demonstrating the state which mounted | wore the rotor with the swing bucket support apparatus of this invention. The top view for demonstrating the state which mounted | wore the swing bucket support apparatus of this invention with the rotor, and also mounted | wore the swing arm support apparatus with the swing arm. Sectional drawing on the BB 'line of FIG. The side view for demonstrating the structure of the annular drum used for this invention. The top view for demonstrating the structure of the positioning plate used for this invention. FIG. 9A is a plan view, B is a side view, and C is a cross-sectional view taken along the line CC ′ shown in FIG. 8A for explaining the structure of the swing bucket applied to the first embodiment of the present invention. The top view for demonstrating 2nd Embodiment of the swing bucket support apparatus of this invention. Sectional drawing on the AA 'line shown in FIG. Sectional drawing for demonstrating the state which mounted | wore the rotor with the swing bucket support apparatus shown in FIG. The top view for demonstrating the state which mounted | wore the swing bucket support apparatus proposed in 2nd Embodiment of this invention with the rotor, and also mounted the swing bucket in the swing bucket support apparatus. Sectional drawing which looked at FIG. 12 from the side. 14A is a plan view, FIG. B is a side view, and FIG. 14C is a cross-sectional view taken along the line CC ′ shown in FIG. 14A for explaining the structure of a swing bucket applied to the second embodiment of the present invention.

Explanation of symbols

100 swing bucket support device 204 central member
101 annular drum 205 positioning plate
102 swing arm 300 swing bucket 103-1 to 103-6 groove 301 trunnion pin
104 Protruding side 302A, 302B Bending piece
105 trunnion pin groove 303 connecting plate
200 Rotor 304 Tube support hole
201 Tube portion 307 Notch groove
202 Bottom plate
203 Metal cover

Claims (7)

One opening end of the cylindrical portion is closed to form a bottom surface, and a plurality of swing buckets are supported in a swingable manner with the rotation of the rotor inside a rotor driven by a drive shaft connected to the center of the bottom surface. A swing bucket support device,
An outer diameter slightly smaller than the inner diameter of the cylindrical portion constituting the rotor, and an annular drum formed of a thin member having a length slightly shorter than the axial length of the rotor;
A swing arm that protrudes in a triangular prism shape from the inner wall surface of the annular drum toward the center of the annular drum, and is disposed at substantially equal angular intervals on the inner wall surface of the annular drum;
A plurality of grooves formed between the swing arms adjacent to each other and having a width slightly wider than the width of the swing bucket to be supported;
A swing bucket support device comprising: a circular space formed inside an arc connecting each projecting end of the swing arm projecting toward the center of the annular drum of the swing arm.   2. The swing bucket support device according to claim 1, wherein the plurality of swing arms open toward the opening end of the rotor at substantially the same position in the axial direction of the annular drum, and extend from the top surface to the side surface of each swing arm. The swing arms that are in communication with each other and that are adjacent to each other have an engaging groove having the same axis, and a trunnion pin protruding from the swing bucket is engaged with the engaging groove, and the swing arms are arranged between the swing arms. A swing bucket support device characterized in that a swing bucket is supported in a space to be formed.   2. The swing bucket support device according to claim 1, wherein the trunnion pins are passed between the plurality of swing arms so that the shaft cores coincide with each other at substantially the same position in the shaft core direction of the annular drum, and each trunnion pin is connected to each other. A swing bucket support device characterized by being structured to be fixed to a swing arm.   4. The swing bucket support device according to claim 1, wherein a cut groove substantially parallel to an axis of the annular drum is provided on each non-mounting surface of the swing arm of the thin member constituting the annular drum. A swing bucket support device having a structure.   5. The swing bucket support device according to claim 1, wherein a positioning plate having unevenness in a circumferential direction is stacked and attached to a bottom plate constituting the rotor, and the positioning is arranged on a bottom surface of the swing arm. Engaging means for engaging with the unevenness formed on the plate is formed, the engaging means is engaged with the unevenness formed on the positioning plate, and the rotational direction position of the annular drum is set with respect to the rotor. A swing bucket support device fixed. In the swing bucket support device according to any one of claims 1 or 2 , 4 , 5 ,
The swing bucket is
A band-shaped high-strength metal plate is folded in a U shape, and the outer plate surfaces of the pair of U-folded plate surfaces are kept slightly apart from each other, and are parallel to each other. A pair of folded pieces,
A connecting plate for connecting the pair of bent pieces;
A plurality of tube support holes formed on the plate surface of the connecting plate;
Near the bent portion of the pair of bent pieces, the plate surfaces of the pair of bent pieces penetrate substantially perpendicularly, and both ends protrude a predetermined amount from the outer surfaces of the pair of bent pieces, and the pair of bent pieces Trunnion pins welded to each of the pieces;
The swing bucket support device characterized by comprising. In the swing bucket support device according to any one of claims 1 or 3 , 4 , and 5 ,
The swing bucket is
A band-shaped high-strength metal plate is folded in a U-shape, and the outside of the pair of plate surfaces folded in a U-shape is kept parallel to each other while maintaining a distance slightly smaller than the spacing between the swing arms. A pair of folded pieces,
A connecting plate for connecting the pair of bent pieces;
A plurality of tube support holes formed on the plate surface of the connecting plate;
The pair of bent pieces are cut away from the free end sides of the pair of bent pieces toward the connecting plate, the terminal ends are located close to the back surface of the connecting plate, and the groove width is slightly larger than the diameter of the trunnion pin. Groove,
The swing bucket support device characterized by comprising.

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