JP3102806U - Hollow pit lid - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve the non-slip effect of a hollow pit lid having a closed cross-section structure while utilizing the advantages (light weight and strongness) of the lid, and to easily change the specifications of a lid upper wall at low cost.
SOLUTION: A hollow pit lid A includes a lid body T integrally formed by extrusion molding or drawing molding, and a checker plate C having a non-slip portion Cs on the upper surface and supported on the lid body T, The lid main body T is a flat rectangular base portion Tb, and extends straight from the base portion Tb along the molding direction of the extrusion molding or the drawing molding, and is parallel to each other at intervals. The lower surface of the checker plate is placed on the upper end of the column Ta, and at least a portion between the column Ta and the checker plate C is provided between the column Ta and the checker plate C. It is integrally connected by a plurality of fixtures B penetrating C.
[Selection diagram] Fig. 1

Description

  The present invention relates to a hollow pit lid that covers an opening of a pit groove.

  Conventionally, in a pit cover that covers an opening of a pit groove provided under the floor or the like for storing wiring cables and the like, by forming the cover body from a hollow body having a closed cross-sectional structure, the necessary rigidity strength is secured. A device that achieves weight reduction so that the operation of opening and closing the lid can be reduced is already known.

Also, such a hollow pit lid formed of an extruded product is already known (for example, see Patent Document 1 below).
JP-A-10-183741

  By the way, in the case of a conventional hollow pit lid in which the lid body is formed of an extruded product, when the anti-slip irregularities are formed simultaneously with the extrusion of the lid body, for example, as illustrated in FIG. Since the anti-slip irregularities become concave or convex linearly extending in the extrusion molding direction, the anti-slip effect in the direction perpendicular to these concave or convex is large, but the concave or convex is large. There is a problem of slipperiness in the direction along the strip.

  In addition, if the entire lid is made of an extruded product as in the past, when the specifications (eg, plate thickness, design, etc.) of the lid upper wall are changed, another extruded product (entire lid) is newly added according to the change. Therefore, there is also a problem that the mold cost and the like increase accordingly.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a hollow pit lid having a simple structure capable of solving the conventional problems at once, while taking advantage of the hollow pit lid. I do.

  In order to achieve the above object, the invention of claim 1 is to provide a hollow pit lid having a closed cross-section structure covering the opening of the pit groove, wherein a lid body integrally formed by extrusion or drawing and a non-slip portion on the upper surface. And a checker plate supported on the lid body, wherein the lid body has a flat rectangular base portion, and stands up from the base portion along the molding direction of the extrusion molding or the pultrusion molding. A plurality of pillars each extending linearly and parallel to each other at intervals, and the lower surface of the checker plate is placed on the upper ends of the pillars; The portion and the checker plate are integrally connected by a plurality of fixtures penetrating the plate.

  According to a second aspect of the present invention, in addition to the features of the first aspect, the upper end of each pillar portion extends linearly along the molding direction of the extrusion molding or the drawing molding and engages with the fixture. An engaging groove which can be formed is formed.

  According to a third aspect of the present invention, in addition to the features of the second aspect, each of the engagement grooves is formed such that an upper end opening thereof is narrowed, and the fixing tool is formed in the checker plate. The blind rivet is formed of a blind rivet in which a shaft is inserted through the through hole.The blind rivet has an enlarged head that engages with the upper surface of the checker plate at the upper end of the shaft, and the lower end of the shaft has the blind rivet. It is characterized in that a swaging portion that engages with the engagement groove is formed.

  According to a fourth aspect of the present invention, in addition to the features of the first aspect, the fixing member detachably connects the checker plate and the pillar.

  According to a fifth aspect of the present invention, in addition to the features of the first or the fourth aspect, the fixing tool is constituted by a tapping bolt screwed into an upper portion of the column through a through hole formed in the checker plate. It is characterized by.

  As described above, according to the present invention, a hollow pit lid includes a lid body integrally formed by extrusion or drawing, and a checker plate having a non-slip portion on an upper surface and supported on the lid body. The lid body has a flat rectangular base portion, and a plurality of base portions standing straight from the base portion and extending linearly along the molding direction of the extrusion molding or the pultrusion molding and parallel to each other at intervals. And the lower surface of the checker plate is placed on the upper end of each of the pillar portions. At least a portion between the pillar portions and the checker plate has a plurality of fixed members penetrating the plate. In this connection, the lid body and the checker plate cooperate with each other to obtain a strong and lightweight hollow pit lid with a closed cross-sectional structure. One The slip preventing portion capable of exhibiting slip effect because it is possible to form a, the molding direction of extrusion or drawing of the lid body can exhibit a good anti-slip effect of multiple directions irrespective. In addition, since various types of checker plates having different appearances and plate thicknesses are commercially available, it is easy to change the specifications (for example, plate thickness, design, etc.) of the lid upper wall by appropriately selecting and using these. Since the lid body (extruded product) having the same structure can be used even after the change, the die cost can be reduced and the versatility of the lid body can be improved.

  According to the invention of the second aspect, the engaging groove is formed at the upper end of each pillar portion so as to extend linearly along the molding direction of the lid body and can engage with the fixing tool. And each column can be relatively easily engaged, and even if each column has a relatively complicated cross-sectional shape due to the special provision of the engagement groove, this can be performed by extrusion or pultruding of the lid body. At the same time, it can be easily and accurately formed.

  According to the third aspect of the present invention, each engaging groove is formed so that its upper end opening is narrowed, and the fixing tool is inserted into the through-hole formed in the checker plate so that the shaft is inserted. The blind rivet has an enlarged head that engages with the upper surface of the checker plate at the upper end of the shaft, and a swaged enlarged portion that engages with the engagement groove at the lower end of the shaft. Is formed, so that the checker plate can be easily coupled to the lid body using the blind rivet.

  According to the invention of claim 4, particularly, since the checker plate and the pillar portion are detachably connected to each other, only the checker plate can be replaced with another checker plate even after the pit lid assembly is completed. Therefore, even when the checker plate is worn or damaged due to long-term use, it is possible to replace only the checker plate while continuously using the lid main body, thereby reducing costs.

  According to the invention of claim 5, since the fixing tool is constituted by a tapping bolt screwed into the upper part of the column through a through hole formed in the checker plate, the checker plate is closed using the tapping bolt. The checker plate can be easily separated from the lid body after assembly by simply loosening the tapping bolt after assembly.

  Hereinafter, embodiments of the present invention will be specifically described based on embodiments of the present invention illustrated in the accompanying drawings.

  1 to 5 show a first embodiment of the present invention. FIG. 1 is a partially cutaway perspective view showing a pit lid set in a pit groove, and FIG. 2 is a pit lid. FIG. 3 is an exploded perspective view of the pit lid, FIG. 4 is an enlarged sectional view taken along line 4-4 of FIG. 2, and FIG. It is process explanatory drawing which shows the assembly process of a blind rivet. FIG. 6 is a sectional view corresponding to FIG. 4, showing a second embodiment of the present invention.

  First, a first embodiment will be described. In FIG. 1, a pit groove P having a U-shaped cross section for cable storage is recessed in an installation surface F which is fixed indoors or outdoors with concrete or the like, and has a width of the pit groove P. A step portion Fs which is one step lower than the installation surface F is formed at the opening edge portion on both sides in the direction, and the step portion Fs is arranged in a longitudinal direction along the longitudinal direction of the groove P so as to close the open upper surface of the groove P. The left and right side edges of the plurality of pit lids A are respectively engaged and supported. By adopting such a lid receiving structure, the upper surface of the pit lid A is substantially flush with the installation surface F, and forms a walking surface together with the installation surface F.

  Each pit lid A includes a lid main body T and a checker plate C supported on the lid main body T. The lid body T is formed by extruding a lid body material (not shown) from an extrudable metal material such as aluminum, an aluminum alloy or the like with a direction perpendicular to the longitudinal direction of the pit groove P as an extrusion direction. Is formed by being cut to a predetermined dimension substantially equal to the groove width of the groove.

  The checker plate C is formed by rolling a metal material such as steel, stainless steel, or an aluminum alloy using a rolling roll having notches (stripes) on the surface, as in the case of a conventional checker plate (commercially available). And at the same time as the roll forming, on one surface of the checker plate C, a non-slip portion Cs composed of a vertical ridge (or a vertical ridge) and a horizontal ridge (or a horizontal ridge) orthogonal to each other. Molded. With such a non-slip portion Cs extending in the vertical and horizontal directions, a good anti-slip effect in multiple directions can be exhibited regardless of the extrusion molding direction of the lid body T. It should be noted that the checker plate C may be manufactured by press forming instead of the rolling roll forming.

  Next, the structure of the lid body T and the checker plate C will be described with reference to FIGS.

  The lid body T is a flat rectangular plate-shaped base portion Tb, and stands upright from both side edges and an intermediate portion of the base portion Tb so as to extend linearly along the molding direction of the extrusion molding and to mutually extend. There are a plurality of columns Ta that are parallel at intervals, and the lower surface of the checker plate C is placed on the upper ends of the columns Ta.

  At least a part (all in the embodiment) of the pillar portion Ta and the checker plate C are integrally connected by blind rivets B as a plurality of fixing tools penetrating the plate C up and down.

  The upper part of each pillar Ta is formed wider than the lower part, and the wide part (upper part of the pillar Ta) linearly extends along the molding direction of the extrusion molding to form the swaging part of the blind rivet B. An engagement groove G that can engage with Bk is formed. Each of the engagement grooves G has an inward flange Gf integrally connected to the left and right opening edges so that the upper end opening O is narrowed.

  The blind rivet B is formed integrally with a hollow shaft portion Bm inserted into a through hole Ch formed in the checker plate C at a portion corresponding to the engagement groove at an interval from the engagement groove, and an upper end portion of the shaft portion Bm. The disk-shaped enlarged head Bt that can be engaged with the upper surface of the checker plate C and the upper end opening O of the engaging groove G provided at the lower end of the shaft Bm (particularly, the inward flange Gf) And a swaging enlarged portion Bk that engages with

  Next, the operation of the above embodiment will be described. When assembling the pit cover A, the cover body T is separately formed by extrusion and the checker plate C is separately formed by roll forming, and the two T and C are connected by a blind rivet B as a fixture.

  In the joining step, as shown in FIG. 5A, first, the fastening pin 1 is inserted into the hollow shaft portion Bm of the blind rivet B from below, and the upper portion of the pin 1 is clamped by the caulking jig J. On the other hand, the lower surface of the checker plate C is superimposed and placed on the lid body T. Then, as shown in FIG. 5B, the hollow shaft portion Bm of the blind rivet B with the fastening pin 1 inserted therein is inserted into each through hole Ch formed in a portion of the checker plate C corresponding to the engagement groove. By inserting the rivet B from above, the enlarged head Bt of the rivet B is engaged with the upper surface of the checker plate C.

  Thereafter, as shown in FIG. 5C, if the upper part of the fastening pin 1 is strongly pulled upward while suppressing the enlarged head Bt of the blind rivet B by the caulking jig J, the shaft of the blind rivet B is obtained. The lower end of the portion Bm is plastically deformed by the expanding action of the enlarged lower end portion 1a of the tightening pin 1 to form an enlarged crimped portion Bk, thereby forming an upper end opening O of the engaging groove G (particularly an inward flange portion Gf). ), The relatively weak intermediate portion of the shaft of the fastening pin 1 is broken. Thus, the checker plate C is integrated with the lid body T via the blind rivet B. The blind rivet itself is conventionally known as a caulking fastener, and in the present invention, the conventionally known blind rivet is used as a fixing tool.

  When the lid body T and the checker plate C are connected to each other using the blind rivet B, a strong and lightweight hollow pit lid A having a closed cross-sectional structure is formed by cooperation of the lid body T and the checker plate C. The vertical and horizontal anti-slip portions Cs formed on the upper surface of the checker plate C exhibit a good anti-slip effect in multiple directions regardless of the extrusion direction of the lid body T.

  As the checker plate C, various types of products having different appearances, plate thicknesses, and the like are commercially available, and by appropriately selecting and using them, the specification (for example, plate thickness, design, etc.) of the upper wall of the pit lid A can be changed. Since the lid body T (extruded product) having the same structure can be used even after the change, the die cost can be reduced and the versatility of the lid body can be increased.

  Further, in the illustrated example, an engagement groove G that extends linearly along the molding direction of the lid main body T and can engage with the fixture is formed at the upper end of each pillar Ta in the lid main body T. The blind rivet B as a fixture and each pillar Ta can be relatively easily engaged with each other. Even if each pillar Ta has a relatively complicated cross-sectional shape due to the special provision of the engagement groove G, it can be easily and accurately formed at the same time as the extrusion of the lid main body T.

  In addition, each engaging groove G is formed so that its upper end opening O is narrowed, while the blind rivet B as a fixing tool has a large head Bt that engages with the upper surface of the checker plate C. Since the rivet has the upper end of the shaft portion Bm and the lower end portion of the shaft portion Bm is formed with a swaged portion Bk that engages with the engagement groove G, the checker plate C is formed using the blind rivet B. It can be easily and accurately coupled to the lid body T.

  FIG. 6 shows a second embodiment of the present invention. In this embodiment, the checker plate C and the pillar Ta of the lid body T are detachably connected by a tapping bolt B 'as a fixing tool.

  The tapping bolt B ′ is screwed into the upper part of the pillar Ta of the lid body T through a through hole Ch formed in the checker plate C at a portion corresponding to the pillar at an interval. In the illustrated example, the upper part (that is, the threaded portion of the tapping bolt B ') of each pillar Ta is formed to be slightly thicker than its lower part, and the engaging groove G of the first embodiment is omitted. .

  When assembling the pit lid A, the lid main body T is separately molded by extrusion molding, and the checker plate is separately molded by roll molding, and these are detachably connected to each other by tapping bolts B 'as a fixture.

  In the joining step, the lower surface of the checker plate C is superimposed and placed on the lid main body T, and then the tapping bolt B 'is passed through the through-hole Ch formed in the portion of the checker plate C corresponding to the column portion, so that the lid main body T Into the upper part of the pillar Ta. Thus, the checker plate C is integrated with the lid body T via the tapping bolt B '.

  In the second embodiment, the same operation and effect as those of the first embodiment can be obtained. However, in the present embodiment, the checker plate C and the column Ta of the lid body T are detachably connected. Therefore, even after the pit cover A has been assembled, only the checker plate C can be replaced with another checker plate.

  Therefore, even when the checker plate C is worn or damaged due to long-term use, it is possible to replace only the checker plate while continuing to use the lid body T, thereby reducing costs.

    Although the embodiment of the present invention has been described above, the present invention is not limited to the embodiment, and various embodiments are possible within the scope of the present invention.

  For example, in the above-described embodiment, the lid main body T is formed from a metal material such as aluminum which can be extruded, but in the present invention, the metal lid main body T may be formed by drawing. Alternatively, the lid body T may be extruded or drawn from a high-strength synthetic resin material such as FRP that can be extruded or drawn.

  In the above-described embodiment, the pit cover A for the pit groove P for accommodating the wiring cable is shown. However, in the present invention, the use of the pit groove is not limited to the embodiment. It may be.

  Further, in the above embodiment, the bending direction of the extrusion or drawing of the lid body T (the extending direction of the pillar Ta) is made orthogonal to the longitudinal direction of the pit groove P to increase the bending rigidity of the lid body T. However, the molding direction may be along the longitudinal direction of the pit groove P or may be oblique to the longitudinal direction.

1 is a partially cutaway perspective view showing a state in which a pit cover is set in a pit groove according to a first embodiment of the present invention. Enlarged plan view in which a part of the pit lid is broken (enlarged view as viewed in the direction of arrow 2 in FIG. 1). Exploded perspective view of the pit lid 2 is an enlarged sectional view taken along line 4-4 in FIG. Process explanatory drawing showing the assembly process of blind rivets FIG. 4 is a sectional view showing a second embodiment of the present invention, corresponding to FIG. 4. FIG. 1 is a perspective view showing a conventional example of a pit lid corresponding to FIG.

Explanation of reference numerals

A ··· Pit lid B ··· Blind rivet Bk as a fixing tool · Enlarged caulking part Bm · · · Shaft part Bt · · · Enlarged head B '· · · Tapping bolt C as a fixing tool ···· Checker plate Ch ··· Through hole Cs ··· Non-slip portion G ···· Engaging groove O ····· Top opening P ···· Pit groove T ···· Lid body Ta ... Column Tb ... Base

Claims (5)

In a hollow pit lid having a closed sectional structure covering the opening of the pit groove (P),
A lid body (T) integrally formed by extrusion or drawing, and a checker plate (C) having a non-slip portion (Cs) on the upper surface and supported on the lid body (T);
The lid body (T) has a flat rectangular base portion (Tb), and stands straight from the base portion (Tb) to extend linearly along the molding direction of the extrusion molding or the pultrusion molding. And a plurality of columns (Ta) parallel to each other at intervals, and the lower surface of the checker plate (C) is placed on the upper ends of the columns (Ta).
At least a part of the pillar (Ta) and the checker plate (C) are integrally connected by a plurality of fixtures (B, B ') penetrating the plate (C). , Hollow pit lid.   At the upper end of each pillar (Ta), an engagement groove (G) is formed, which extends linearly along the molding direction of the extrusion molding or the drawing molding and can engage with the fixing tool (B). The hollow pit lid according to claim 1, wherein:   Each engagement groove (G) is formed such that its upper end opening (O) is narrowed, and the fixing tool (B) is inserted into a through hole (Ch) formed in the checker plate (C). The blind rivet (B) is formed of a blind rivet through which the shaft (Bm) is inserted. The blind rivet (B) has an enlarged head (Bt) engaged with the upper surface of the checker plate (C) at the upper end of the shaft (Bm). 3. The hollow pit cover according to claim 2, wherein an enlarged swaging portion (Bk) that engages with the engagement groove (G) is formed at a lower end of the shaft portion (Bm). .   2. The hollow pit cover according to claim 1, wherein the fixture (B ′) detachably connects the checker plate (C) and the pillar (Ta). 3. The said fixing tool (B ') is comprised from the through-hole (Ch) drilled in the said checker plate (C), and is comprised from the tapping bolt screwed into the upper part of the said column part (Ta). 5. The hollow pit lid according to 1 or 4.

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