JP2014221143A - Shelf frame structure of rack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To raise the strength of a shelf frame where sub-beams arranged in a depth direction are disposed at an appropriate interval in a frontage direction between pairs of front and rear main beams arranged in a frontage direction while reducing a cost.SOLUTION: Horizontal plate parts 16b projecting inward at the intermediate height positions and vertical plate parts 16a drooping down from the internal sides of the horizontal plate parts are formed in the length direction in main beams 3a, 3b. Projection parts 10, 11 to be placed on the horizontal plate parts 16b of the main beams 3a, 3b and overlap plate parts 12 that are formed by allowing both side plate parts 5, 6 to mutually overlap by bending on the lower sides of the projection parts 10, 11 and also are adjacent to the vertical plate parts 16a are formed at both of the ends of the side plate parts 5, 6 in the length direction in sub-beams 4. The overlap plate parts 12 are fastened to the vertical plate parts 16a of the main beams 3a, 3b with the use of fixtures (bolts and nuts 20, 21) to horizontally penetrate the plate parts.

Description

  The present invention relates to a rack shelf frame, that is, a shelf frame structure in which sub-beams extending in the depth direction are installed at appropriate intervals in the frontage direction between a pair of front and rear main beams that are long in the frontage direction.

  The rack frame structure described in Patent Document 1 as this type of rack is formed by the left and right side plate portions of the sub-beam at both ends in the length direction of the sub-beam in the gate-shaped cross-sectional structure of the lower release over the entire length. A supported engagement portion comprising a protrusion and a pair of left and right engaging pieces bent downward from the tips of the pair of left and right protrusions is provided, and the main beam has the pair of left and right protrusions of the sub beam. The support engagement part which consists of a horizontal plate part which supports a part, and a pair of right and left locking holes into which the pair of left and right locking pieces fits downward from above is provided. In the configuration described in Patent Document 1, a pair of left and right engaging pieces on the sub-beam side are lowered by lowering the supported engaging portions at both ends of the sub-beam in a state of being inserted into the upper side of the horizontal plate portion of the main beam. Are fitted in a pair of left and right engaging holes on the main beam side and are positioned with respect to each other, and the pair of left and right protrusions on the sub beam side are supported by the horizontal plate portion on the main beam side. In addition, the device described in Patent Document 1 has a configuration in which the vertical plate portions formed at both ends of the sub beam are overlapped with the vertical plate portion on the main beam side, and both are fastened by bolts and nuts penetrating in the horizontal direction. ing.

JP 11-290139 A Japanese Utility Model Publication No. 60-2840

  In the rack shelf frame structure described in Patent Document 1, the relative movement in the horizontal two-dimensional direction of the sub-beam-side protrusion with respect to the main-beam-side horizontal plate is caused by the pair of left and right locking pieces and the pair of left and right engagements. Although it can be prevented by fitting in the vertical direction with the stop hole, it is not possible to prevent lifting of both ends of the sub beam with respect to the main beam. On the other hand, in the configuration described in Patent Document 2, both ends of the sub beam can be completely positioned in the three-dimensional direction with respect to the main beam, but the load acting on the sub beam is a horizontal bolt that fastens the main beam and the sub beam to each other. It will be received by the shear stress of the nut. In addition, the rotation of the sub beam around the axis of the bolt nut parallel to the length direction of the sub beam can be prevented by a square bolt hole provided in the main beam and the sub beam and a square root bolt fitted thereto. It cannot be used as a rack frame structure for racks that receive heavy loads.

  The present invention proposes a rack shelf frame structure that can solve the above-mentioned conventional problems, and the rack shelf frame structure according to the present invention has a relationship with the embodiments described later. For ease of understanding, the reference numerals used in the description of the embodiment are shown in parentheses, and the sub-beams along the depth direction are provided between the pair of front and rear main beams (3a, 3b) long in the frontage direction. In the rack shelf frame (2) constructed by laying (4) at appropriate intervals in the frontage direction, the main beam (3a, 3b) has a horizontal plate portion (16b) projecting inward at the intermediate height position. A vertical plate portion (16a) depending from the inner side of the horizontal plate portion is formed along the length direction, and the sub-beam (4) has a gate-shaped cross-sectional structure with a lower opening over the entire length, and both sides thereof. At both ends in the length direction of the plate portion (5, 6), the horizontal of the main beam (3a, 3b) Formed by bending the protruding parts (10, 11) placed on the part (16b) and the both side plate parts (5, 6) below each other on the lower side of the protruding parts (10, 11) And an overlapping plate portion (12) adjacent to the vertical plate portion (16a) of the main beam (3a, 3b) is formed, and the overlapping plate portion (12) is the vertical plate portion of the main beam (3a, 3b). (16a) is configured to be fastened by a fixture (bolt nut (20, 21)) penetrating them horizontally.

  According to the configuration of the present invention, the pair of left and right projecting portions at both ends of the sub beam are supported on the horizontal plate portion on the main beam side, so that the load acting on the sub beam fastens the main beam and the sub beam. Without acting on the fixture, the horizontal plate portion on the main beam side can be supported by the protruding portion. Moreover, due to the presence of the fixture that fastens the main beam and the sub beam, both ends of the sub beam can be completely positioned with respect to the main beam in the three-dimensional direction, and the sub beam rotates around the axis of the fixture. The contact between the pair of left and right projections on the sub-beam side and the horizontal plate on the main beam side can prevent and reliably prevent heavy loads from relying on square bolt holes and square root bolts. It can also be easily used as a rack frame for supporting racks.

  Furthermore, according to the configuration of the present invention, the vertical plate portion for securing the portion where the left and right side plate portions of the sub beam are connected and integrated with each other at both ends of the sub beam and the insertion hole of the fixture is provided is provided. Compared with the case of welding the different plate materials or integrally forming the sub beam as a whole into a three-dimensional structure by press working because it is composed of overlapping plate parts that are bent from the left and right side plate parts and overlapped with each other. It can be carried out easily and inexpensively. Moreover, while the sub beam end is fastened to the main beam side by a fixture such as a bolt and nut, the left and right side plates of the sub beam can be connected and integrated with each other. When the sub beam is about to twist, the twist can be surely prevented by the overlapping plate portion and the fixture.

  Note that the sub-beams with a gate-shaped cross section structure that is open at the bottom over the entire length are not just a portal shape, but are inward or outward from the lower side of both side plates (5, 6) in order to increase the bending strength against the load. The horizontal projecting plate parts (8a, 8b) can be bent continuously in the direction, but the bending strength is increased by forming the upper end part of the gate-shaped cross section in the trapezoidal part (9) with an upper constriction. In addition, the sub-beam can be effectively prevented from being deformed when the load to be supported is shifted laterally in the frontage direction (the length direction of the main beam). In this case, the protrusions (10, 11) of the sub beam (4) are bent along the sub beam length direction at the lower end of the trapezoidal part (9) of the sub beam (4) at an intermediate position of the height. By forming so as to include the portions (5c, 6c), it is possible to increase the bending strength of the pair of left and right protrusions at the end of the sub beam, and to improve the load bearing performance.

  The main beam (3a, 3b) may have any cross-sectional shape as long as it includes the horizontal plate portion (16b) and the vertical plate portion (16a). A top plate portion (14) that covers the projection (10, 11) of the sub beam (4) supported by the top plate portion (14) and the horizontal plate portion (16b). The protrusion (10, 11) of the sub beam (4) is inserted between the vertical plate (16a) of the main beam (3a, 3b) and the overlapping plate of the sub beam (4). (12) and the top plate portion of the main beam (3a, 3b) on the protruding portion (10, 11) of the sub beam (4) when fastened by the fixture (bolt nut (20, 21)) It is desirable that the tip (14a) of (7) be close.

  That is, as described in Patent Document 1, a structure is known in which a main plate side is provided with a horizontal plate portion that supports the protruding portion of the sub beam and a top plate portion that covers the protruding portion on the sub beam side. However, in the conventional one, the sub-beam (protruding part) is lowered downward with the sub-beam side protruding part inserted between the top plate part and the horizontal plate part of the main beam, and the locking piece is Since it was necessary to fit in the locking hole, the space height between the top plate portion on the main beam side and the horizontal plate portion is inevitably higher than the height of the protruding portion on the sub beam side. It becomes higher by the height of. Therefore, in a state where the sub beam end is supported by the main beam, the height between the protruding portion on the sub beam side and the top plate portion covered thereon is equal to or higher than the height of the locking piece. Therefore, when a heavy load is accidentally lowered onto the main beam, the top plate portion of the main beam will be greatly bent downward and deformed. According to the configuration, the deformation of the top plate portion on the main beam side at this time can be received and prevented by the protruding portion on the sub beam side.

FIG. 1 is a schematic perspective view showing the entire rack. 2A is a partially cutaway side view of a sub beam, FIG. 2B is a cutaway plan view of the same part, FIG. 2C is a left side view thereof, and FIG. 2D is a longitudinal side view of the same. FIG. 3 is a partially cutaway vertical side view showing a state before the sub beam and the main beam are connected to each other. 4A is a partially cutaway side view of the shelf frame, and FIG. 4B is a front view of the main part. 5A is a partially cutaway plan view of the main part of the shelf frame, FIG. 5B is an enlarged cross-sectional plan view of the main part, and FIG. 5C is a cross-sectional plan view of the main part.

  In FIG. 1, reference numerals 1a to 1d denote pillars, and reference numeral 2 denotes a shelf frame supported at the four corners by the pillars 1a to 1d, and is a main beam extending in the front-side front direction between a pair of front left and right pillars 1a and 1b. 3a and a pair of rear left and right support columns 1c and 1d, and a main beam 3b in the direction of the rear side, and a pair of front and rear main beams 3a and 3b parallel to the depth direction and at appropriate intervals in the direction of the front. A plurality of sub-beams 4 are constructed.

  The structure of each shelf frame 2 will be described in detail. As shown in FIGS. 2 and 3, each of the sub-beams 4 includes left and right side plate portions 5, 6 and a top plate portion 7, and left and right side plate portions 5, 6. It consists of horizontal projecting plate portions 8a and 8b that are continuously bent at right angles from the lower side to the outside, and has a gate-shaped cross-sectional structure with a lower opening over the entire length. A vertical parallel side plate portion 5a, 6a from the intermediate position to the lower side, and an inclined side plate portion 5b, 6b inclined obliquely inward from the parallel side plate portion 5a, 6a to the upper end. 5b, 6b and the top plate portion 7 are symmetrically formed with a trapezoidal trapezoidal portion 9.

  A pair of left and right projecting portions 10 and 11 and an overlapping plate portion 12 are formed at both ends of the sub beam 4 in the length direction. The pair of left and right projecting portions 10 and 11 extend in the length direction of the sub beam 4 in a region from an intermediate position near the upper end of the parallel side plate portions 5a and 6a in the left and right side plate portions 5 and 6 to an intermediate height of the inclined side plate portions 5b and 6b. The bent portion 5c, 6c between the parallel side plate portions 5a, 6a and the inclined side plate portions 5b, 6b is provided at the intermediate height position, and the upper side is the length of the sub beam 4 The horizontal upper edges 10a and 11a are parallel to the vertical direction, and the inclined upper edges 10b and 11b are inclined downward from the horizontal upper edges 10a and 11a. The overlapping plate portion 12 extends vertically parallel plate portions 5a, 6a below the projecting portions 10, 11 in the sub-beam length direction and is bent inward at a right angle so as to overlap each other. 12b, and the vertical bent plate portions 12a and 12b are concentrically overlapped with each other, and are located at a central position in the width direction of the sub beam 4 and penetrate through in the length direction of the sub beam 4 Square holes 13 a and 13 b to be the holes 13 are provided. The square holes 13a and 13b may be of the same size, but the vertical hole 12a (13b) of the vertical bent plate portion 12a (12b) that overlaps the outer side is the vertical bent plate portion 12b (12a) that overlaps the inner side. ) Is slightly larger than the square hole 13b (13a), and even if there is some variation in the overlap margin of the vertical bent plate portions 12a and 12b, the area of the square hole 13b (13a) that is at least one smaller is It is desirable to ensure that it is secured.

  Each of the main beams 3a and 3b is formed by bending a single band-shaped metal plate, and has the same size and cross-sectional shape. As shown in FIGS. 3 and 4, the main beams 3a and 3b are parallel to each other. The plate portion 14 and the bottom plate portion 15, the U-shaped ridge portion 16 located at the center between the top plate portion 14 and the bottom plate portion 15, and the open portion side, the top plate portion 14 and the bottom plate portion of the U-shaped ridge portion 16. 15 is of a vertical cross section consisting of inclined plate portions 17 and 18 that are connected to each other, and has a vertical cross section of approximately Σ shape. Portions 14a and 15a are provided. The main beams 3a and 3b having the Σ-shaped cross section are horizontally installed between the support columns 1a and 1b and between the support columns 1c and 1d in a direction in which the U-shaped protrusions 16 face each other. The vertical plate 16a of the U-shaped protrusion 16 of each main beam 3a, 3b has a through-square bolt provided on the overlapping plate 12 of the sub beam 4 at each sub beam mounting position of the main beam 3a, 3b. A through square bolt hole 19 identical to the hole 13 is provided.

  The distance between the U-shaped protrusions 16 (vertical plate portions 16a) of the pair of front and rear main beams 3a and 3b having the above-described configuration is substantially the same as the length between the outer surfaces of the overlapping plate portions 12 at both ends of the sub beam 4. The width of the upper horizontal plate portion 16b of the U-shaped ridge portion 16 is slightly wider than the protruding length of the protruding portions 10 and 11 from the overlapping plate portion 12 at both ends of the sub beam 4. The maximum height of the protrusions 10 and 11 (the height at the positions of the horizontal upper edge portions 10a and 11a) is the upper horizontal plate portion 16b of the U-shaped ridge portion 16 and the vertical extending plate of the top plate portion 14. It is comprised so that it may become a little lower than the perpendicular | vertical space | interval between the lower ends of the part 14a.

  Therefore, when the sub beam 4 is installed between the pair of front and rear main beams 3a and 3b horizontally installed between the support columns 1a and 1b and between the support columns 1c and 1d, the sub beam 4 is paired front and rear in an oblique direction in plan view. After being positioned between the main beams 3a and 3b, the sub beam 4 is rotated in a horizontal direction perpendicular to the main beams 3a and 3b, so that the protrusions 10 and 11 at both ends of the sub beam 4 are connected to the main beams 3a and 3b. The protruding portions 10 and 11 are placed on the upper horizontal plate portion 16b of the U-shaped protruding portion 16 by being inserted between the U-shaped protruding portion 16 and the vertical projecting plate portion 14a of the top plate portion 14. Thus, the sub beam 4 can be temporarily placed in a horizontal horizontal direction between the pair of front and rear main beams 3a and 3b. At this time, since the overlapping plate portion 12 at both ends of the sub beam 4 and the vertical plate portion 16a of the U-shaped protruding portion 16 of the main beams 3a and 3b are adjacent to each other, the through-rectangular bolt holes 13 and 19 of both are connected to each other. The concentric alignment is performed, and the square root bolt 20 is inserted into the through square bolt holes 13 and 19 from between the left and right side plate portions 5 and 6 of the sub beam 4. The square root 20a of the square root bolt 20 is fitted in the through square bolt holes 13 and 19 so as not to rotate relative to each other and has a length slightly shorter than the entire axial depth of the through square bolt holes 13 and 19. It is. Thus, nuts 21 are screwed into the square root bolts 20 projecting into the U-shaped protrusions 16 of the main beams 3a, 3b, so that the overlapping plate portions 12 on both ends of the sub beam 4 and the main beams 3a, 3b are connected to each other. The vertical plate portion 16a of the shaped ridge portion 16 is fastened to each other.

  As shown in FIGS. 4 and 5, the sub beam 4 installed in the horizontal direction between the pair of front and rear main beams 3a and 3b as described above is connected to the main beam 3a via the projecting portions 10 and 11, as shown in FIGS. , 3b is supported on the upper horizontal plate portion 16b of the U-shaped protrusion 16 and the top plate portion 7 which is the upper surface for supporting the load of the sub beam 4 is substantially the same as the top plate portion 14 of the main beams 3a, 3b. They are at the same height, and both ends in the length direction of the top plate portion 7 are located at positions adjacent to the vertical projecting plate portion 14a of the top plate portion 14 of the main beams 3a, 3b. Therefore, the vertical projecting plate portion 14a of the top plate portion 14 of the main beams 3a and 3b has a slight gap on the horizontal upper edge portions 10a and 11a at the base portions of the protruding portions 10 and 11 of the sub beam 4 at the lower ends. Is located. Naturally, the nut 21 screwed into the square root bolt 20 is of a size that can be rotated in the groove of the U-shaped protrusion 16 of the main beams 3a, 3b.

  In addition, since the square rooted bolt 20 is used, the nut 21 can be fastened without the need to rotate the bolt head, so that the sub beam 4 can be easily and efficiently attached. The sub beam 4 attached to the main beams 3a and 3b by one bolt nut rotates around the one bolt nut. The pair of left and right projecting portions 10 and 11 at both ends of the sub beam 4 are connected to the main beam 3a, Since it is blocked by being supported on the upper horizontal plate portion 16b of the 3b U-shaped ridge portion 16, the through-rectangular bolt hole 19 on the main beam 3a, 3b side may be replaced with an ordinary round hole. good. Further, if the workability is sacrificed, a normal bolt having no square root portion 20a may be used instead of the square root bolt 20. Of course, in this case, a normal round hole may be provided in place of the through square bolt holes 13 and 19.

  Further, the shelf frame 2 according to the present invention can support the load by using only the plurality of sub beams 4 or using the plurality of sub beams 4 and the main beams 3a and 3b. Accordingly, shelves can be placed and used. Moreover, although the square root bolt 20 and the nut 21 are used as a fixture, other arbitrary fixtures, such as a rivet, can be utilized.

  The rack shelf frame structure according to the present invention can be used as a shelf frame structure in which sub-beams in the depth direction are installed between main beams in the front-rear frontage direction at appropriate intervals in the frontage direction.

1a to 1d Post 2 Shelf frame 3a, 3b Main beam 4 Sub beam 5, 6 Left and right side plate portions 5a, 6a Parallel side plate portions 5b, 6b Inclined side plate portions 5c, 6c Bending portion 7 Top plate portions 8a, 8b Horizontal overhang plate portions 9 Trapezoidal portion 10, 11 Protruding portion 10a, 11a Horizontal upper edge portion 12 Overlapping plate portion 12a, 12b Vertical bent plate portion 13 Through square bolt hole 14 Top plate portion 14a, 15a Vertical overhanging plate portion 15 Bottom plate portion 16 Strip 16a Vertical plate portion 16b Upper horizontal plate portion 17, 18 Inclined plate portion 19 Through square bolt hole 20 Square root bolt 20a Square root portion 21 Nut

Claims (4)

  In a rack frame of a rack in which sub beams extending in the depth direction are installed at appropriate intervals in the front direction between a pair of front and rear main beams that are long in the front direction, the main beam protrudes inward at an intermediate height position. A horizontal plate portion and a vertical plate portion that hangs down from the inner side of the horizontal plate portion are formed along the length direction, and the sub-beam has a gate-like cross-sectional structure with a lower opening over its entire length, and its both side plates At both ends in the longitudinal direction of the part, a protrusion part placed on the horizontal plate part of the main beam is formed, and the both side plate parts are bent so as to overlap each other below the protrusion part. A rack shelf frame in which an overlapping plate portion adjacent to the vertical plate portion of the main beam is formed, and the overlapping plate portion is fastened to the vertical plate portion of the main beam by a fixture that penetrates these vertically. Construction.   2. The rack shelf frame structure according to claim 1, wherein an upper end portion of the sub beam is formed in a trapezoidal trapezoidal shape at an upper end portion thereof. 3.   The said protrusion part of a sub beam is formed so that the bending part along the sub beam length direction of the lower end of the said upper end trapezoid part of the said sub beam may be included in the intermediate position of the height. Rack shelf frame structure.   The main beam includes a top plate portion that covers the protruding portion of the sub beam supported on the horizontal plate portion, and the protruding portion of the sub beam is inserted from the inside between the top plate portion and the horizontal plate portion. When the vertical plate portion of the main beam and the overlapping plate portion of the sub beam are fastened by the fixture, the tip of the top plate portion of the main beam approaches the protruding portion of the sub beam. The rack shelf frame structure according to any one of claims 1 to 3, wherein the rack shelf frame structure is configured as described above.

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