Deck plate insert

Abstract

To provide an insert for deck plates that enables efficient and safe installation of bolts protruding downward from a floor or screw holes exposed on a floor surface as fastening parts for screws to directly fix lighting, facility stands or the like under concrete floors where deck plates are used, and also that provides high work efficiency when assembling products.SOLUTION: An insert for a deck plate is inserted through an open hole provided in the deck plate from above and attached to the deck plate, and comprises, in an anchor with a flange-shaped head, and a shank having a screw hole at a lower end, an insert body having a washer, and a coil spring that presses the washer onto an upper surface of the deck plate between the washer and the flange-shaped head at an outer periphery of the shank, and an engagement member integrally formed with a mounting portion having a screw portion for screwing into the screw hole in the anchor, and an expandable and contractible engagement piece that straddles the open hole and contacts a lower surface of the deck plate when the insert is mounted through the open hole in the deck plate on an outer surface of the mounting portion.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a deck plate insert for directly fixing lighting fixtures, equipment racks, etc. to the underfloor of a concrete floor structure using a deck plate. [Background technology]

[0002] As shown in Patent Document 1, a conventional insert for a deck plate is disclosed as comprising an insert body consisting of an insert portion having a flange-shaped head and a shaft portion with a female thread portion at the lower end, a washer member and a spring member attached to the outer periphery of the shaft portion, a tubular member having a protruding portion on its underside that can protrude outward in the circumferential direction when inserted into the deck plate, and a temporary fastening member that screws into the female thread portion of the insert body to attach the tubular member to the insert body. To use it, before pouring concrete, the tubular member is pushed downward into the through hole drilled in the deck plate so that the protruding portion abuts the underside of the deck plate, and the compressed reaction force of the spring member attached to the shaft presses the washer member against the upper surface of the deck plate, and the two are attached in a state where they sandwich the deck plate. After the concrete is poured, the temporary fastening member is rotated with a rotary tool or the like and removed together with the tubular member, leaving the insert body buried in a designated position under the floor.The lighting fixture or piping rack can then be fixed in place by tightening a hex bolt of a designated length into the female threaded portion of the insert body through a mounting hole provided in the base of the rack.

[0003] Furthermore, as shown in Patent Document 2, a configuration is disclosed which includes an anchor consisting of a flange-shaped head and a body that forms a bolt shaft at the lower end, a washer and a coil spring attached to the outer periphery of the body of the anchor, and a cylindrical engaging member that has expandable engaging pieces formed in three places around the upper end periphery that come into contact with the underside of the deck plate and has a threaded inner wall that screws onto the bolt shaft, and is connected by screwing the engaging member onto the bolt shaft. To use the anchor, before pouring concrete, the engaging member is pushed downward into the through hole drilled in the deck plate, causing the engaging piece to abut against the underside of the deck plate, and the compression force of the coil spring attached to the anchor body presses the washer against the upper surface of the deck plate, and the two are attached in a state where they sandwich the deck plate.After pouring concrete, the engaging member is manually rotated and removed from the bolt member, so that the bolt is positioned in a predetermined position under the floor with it protruding downward, and the lighting fixture or piping rack can be fixed by tightening a nut on the bolt through a mounting hole provided in the base of the rack.

[0004] In both Patent Documents 1 and 2, the anchors are attached to the deck plate in advance to provide a screw fastening portion in the concrete floor, and after the concrete is poured, the embedded anchor becomes a concrete anchor, and in Patent Document 1, the screw hole in the anchor portion is exposed on the floor surface, while in Patent Document 2, the bolt protrudes downward from the floor, and the fixed material can be fastened and fixed with a hex bolt or hex nut.

[0005] In the above-mentioned conventional method, as described in Patent Document 1, the cylindrical member is removed by loosening the temporary fastening member (hexagonal bolt), which means that two parts come off along with the cylindrical member. Since this work is done at an unstable high place, there is a possibility that the parts may separate and fall, which could cause a major accident. In addition, there are problems such as the large number of parts, making the assembly of the product very complicated.

[0006] In Patent Document 2, the engagement member and anchor are connected by a screw to the bolt shaft, so after concrete is poured, the engagement member needs to be manually rotated to remove it from the bolt shaft that protrudes downward from under the concrete floor, which is time-consuming and reduces work efficiency as it is done at an unstable high place.In addition, there are problems such as the assembly of the product being very complicated due to the screw connection. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Japanese Patent Application Publication No. 2019-60106 [Patent Document 2] Design Registration No. 1524890 Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention has been made in consideration of the above-mentioned conventional problems, and aims to provide an insert for a deck plate that can efficiently and safely install bolts that protrude downward from the floor or screw holes exposed on the floor surface as fastening parts for directly fixing lighting, equipment stands, etc. under a concrete floor that uses a deck plate, and that also allows for efficient work when assembling the product. [Means for solving the problem]

[0009] The first configuration is an insert for a deck plate that is attached by inserting it from above into a through hole opened in a deck plate, and is characterized by comprising an insert body having an anchor that includes a flange-shaped head and a body that has a threaded hole at its lower end, a washer attached to the outer periphery of the body, and a coil spring that presses the washer against the upper surface of the deck plate between the washer and the flange-shaped head, an attachment part that has a threaded portion that screws into the threaded hole of the anchor, and an engaging member that has integrally formed on the outer surface of the attachment part an expandable and contractible engaging piece that straddles the through hole and abuts against the underside of the deck plate when the attachment part is inserted through the through hole in the deck plate and attached.

[0010] A second configuration is characterized in that the engaging member fits into a socket of a rotary tool.

[0011] The third configuration is an insert for a deck plate that is attached by inserting it from above into a through hole opened in the deck plate, and is characterized by comprising an insert body having an anchor that includes a flange-shaped head and a body that has a bolt shank at its lower end, a washer attached to the outer periphery of the body, and a coil spring that presses the washer against the upper surface of the deck plate between the washer and the flange-shaped head, a cylindrical mounting portion that has a flexible piece attached to the bolt shank of the anchor and that is detachable, and an engaging member that has integrally formed on the outer surface of the mounting portion an expandable engaging piece that straddles the through hole and abuts against the underside of the deck plate when the mounting portion is inserted through the through hole in the deck plate and attached.

[0012] A fourth configuration is characterized in that the engaging member fits into a socket of a rotary tool. [Effects of the Invention]

[0013] According to the first configuration, the engaging member is integrally formed with an attachment portion having a threaded portion that screws into the screw hole at the lower end of the anchor of the insert body, and an expandable engaging piece on its outer surface that straddles the through hole in the deck plate and abuts the underside when the engaging member is inserted through the through hole and attached, thereby making the work safer and eliminating the risk of parts separating and falling when the engaging member is removed, and also reducing the number of parts, thereby reducing the labor required for assembly.

[0014] According to the second configuration, the engaging member fits into the socket of the rotary tool, and therefore, assembly and removal can be performed easily and quickly using the rotary tool, thereby improving work efficiency.

[0015] According to the third configuration, the engaging member is a cylindrical mounting portion with a detachable flexible piece surrounding the bolt shaft of the anchor, and therefore assembly can be performed by pressing it onto the bolt shaft, which is quicker than joining to a screw and improves the efficiency of the assembly work.

[0016] According to the fourth configuration, the engaging member fits into the socket of the rotary tool, and therefore, the rotary tool can be used to easily and quickly remove the engaging member, thereby improving work efficiency. [Brief explanation of the drawings]

[0017] [Figure 1] FIG. 1 is a perspective view of a first embodiment of the present invention. [Figure 2] FIG. 1 is an exploded perspective view of a first embodiment of the present invention. [Figure 3] 1A is a front view, FIG. 1B is a right side view, FIG. 1C is a plan view, and FIG. 1D is a bottom view of the first embodiment of the present invention. [Figure 4] 1 is a diagram showing a construction method according to a first embodiment of the present invention. FIG. [Figure 5] FIG. 10 is a perspective view showing a second embodiment of the present invention. [Figure 6] FIG. 10 is an exploded perspective view of a second embodiment of the present invention. [Figure 7] 1A is a front view, FIG. 1B is a right side view, FIG. 1C is a plan view, and FIG. 1D is a bottom view of a second embodiment of the present invention. [Figure 8] FIG. 10 is a diagram showing a construction method according to a second embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0018] (Embodiment 1) A first embodiment of the present invention will be described in detail with reference to FIGS. The insert body 10 is composed of an anchor 14 having a body 12 with a flange-shaped head 11 formed at its upper end and a screw hole 13 at its lower end, a disk-shaped washer 15 that is fitted onto the outer periphery of the body 12 of the anchor 14, and a coil spring 16. The coil spring 16 is disposed between the washer 15 and the flange-shaped head 11, and when compressed, the reaction force of the spring causes it to come into contact with the underside of the flange-shaped head 11, pressing the washer 15 toward the deck plate. The engaging member 20 has a mounting portion 21 as its base, whose width and length are slightly smaller than the diameter of the through hole in the deck plate so that it can be inserted through the through hole. The upper end of the mounting portion 21 has a threaded portion 22 that screws into the screw hole 13 of the anchor 14. Opposing engaging pieces 23, 23 are formed on the outer surface, protruding diagonally upward. When passing through the through hole in the deck plate, the pair of engaging pieces 23, 23 bend inward to reduce their protrusion width. After passing through the through hole, they return to their original shape and protrude from the underside of the deck plate, spanning the through hole. The upper end faces of the locking pieces 23, 23 abut against each other after passing through the through hole. The insert body 10 can be attached with the deck plate sandwiched between the washer 15, which is pressed toward the deck plate by the reaction force of the coil spring 16, and the engaging pieces 23, 23. Opposing abutting pieces 24, 24 are formed on the lower part of the mounting portion 21 to fit into the socket of a rotary tool. A blocking piece 25 having approximately the same diameter as the body 12 of the anchor 14 is formed at the base end of the threaded portion 22. The blocking piece 25 abuts against the periphery of the threaded hole 13 of the anchor 14 and blocks the gap between the threaded hole 13 and the threaded portion, thereby preventing concrete sludge leaking through the gap with the through-hole in the deck plate from adhering to the threaded hole 13 or its periphery. The engaging member 20 is preferably made of plastic and molded as a single unit.

[0019] Next, a method of using the first embodiment of the present invention will be described with reference to FIG. The construction procedure is shown below. (a) Drill a specified through hole C into deck plate A using a drill bit B. (b) To install the insert according to this embodiment into through hole C, first insert the engaging member 20 from the bottom end side and push it in so that the engaging pieces 23, 23 bend inward to reduce the protruding width, and after passing through, it returns to its original shape and protrudes across the through hole, with its upper end face abutting against the underside of the deck plate A. The reaction force of the coil spring 16 attached to the outer periphery of the body 12 of the anchor 14 presses the washer 15 toward the deck plate A, and the deck plate is installed in a state where it is sandwiched between the engaging pieces 23, 23 abutting against the underside of the deck plate A. (c) Pour concrete D. (d) After the concrete has hardened, the hexagonal socket E is fitted into the mounting portion 21 of the engaging member 20 from the underside of the deck plate A and turned to remove the engaging member 20 from the screw hole 13 of the anchor 14, exposing the screw hole 13. Because the engaging member 20 is a single, integrally constructed part, there is no need to worry about the part coming apart and falling. (e) The equipment stand F is fixed by screwing the fixing bolt G into the screw hole 13.

[0020] (Embodiment 2) The second embodiment of the present invention will be described in detail with reference to FIGS. In the second embodiment, only the differences from the first embodiment will be described, and a description of the common parts will be omitted. The second embodiment differs from the first embodiment in the configuration of the bolt shank 170 and the engaging member 200 of the insert body 100. One end of the bolt shank 170 is threaded into the threaded hole 130 of the anchor 140 and fixed by caulking. Alternatively, the bolt shank 170 can be formed integrally with the anchor 140, for example, by cold or hot pressing or cutting. The engaging member 200 has a cylindrical mounting portion 210 as its base, formed with a circumferential diameter sufficient to pass through the through-hole in the deck plate. Three flexible pieces 220 are attached to the bottom of the mounting portion 210, each with a diameter slightly smaller than the outer diameter of the bolt shank 170. The inner wall of each flexible piece 220 is provided with a locking piece 260 that protrudes toward the center and locks into the thread groove of the bolt shank 170. That is, when the bolt shaft 170 is pushed into the gap at the center of the flexible pieces 220 on the three sides of the mounting portion 210, the flexible pieces 220 each bend outward, the diameter of the gap at the center expands, and the mounting portion 210 is assembled to the predetermined position of the bolt shaft 170. The locking piece 260 provided on the flexible piece 220 locks into the thread groove of the bolt shaft 170 to prevent misalignment, and also functions as a screw by fitting along the thread groove; in other words, it can be removed from the bolt shaft 170 by rotating it. Three engaging pieces 230 are formed at equal intervals and project diagonally upward from the outer surface of the mounting portion 210. When these engaging pieces 230 pass through the through-hole in the deck plate, they bend inward and reduce in diameter, and after passing, they return to their original shape and project out from the underside of the deck plate while straddling the through-hole, with their upper end faces abutting against each other, and are attached with the deck plate sandwiched between them and the washer 150, which is urged toward the deck plate by the reaction force of the coil spring 160. Abutment pieces 240 are formed on the outer surface of the flexible pieces 220 to fit into the socket of the rotary tool. Furthermore, a covering piece 250 having approximately the same diameter as the body 120 of the anchor 140 is formed at the upper end of the cylindrical mounting portion 210, and comes into contact with the periphery of the screw hole 130 of the anchor 140 to cover the bolt shaft 170, thereby preventing concrete slag leaking through the gap with the through-hole in the deck plate from adhering to the thread groove of the bolt shaft 170. The engaging member 200 is preferably made of plastic and molded as a single unit.

[0021] Next, a method of using the second embodiment of the present invention will be described with reference to FIG. The construction procedure is shown below, but steps (a) to (c) are omitted as they are the same as those in the first embodiment. (d) After the concrete has hardened, hexagonal socket E is fitted onto flexible piece 220 at the lower end of mounting portion 210 of engaging member 200 from the underside of deck plate A and turned to remove engaging member 20 from bolt shaft 170, exposing bolt shaft 170. Because engaging member 200 is a single, integrally constructed part, there is no need to worry about parts coming apart and falling. (e) The equipment stand F is attached to the bolt shaft 170 and fastened with a fixing nut H. [Explanation of symbols]

[0022] 10, 100 Insert body 11, 110 Flange-shaped head 12, 120 Torso 13, 130 screw holes 14, 140 Anchor 15, 150 washers 16, 160 coil spring 170 bolt shaft 20, 200 engaging member 21, 210 Mounting part 22 Threaded part 220 Flexible piece 23, 230 Engagement piece 24, 240 Contact piece 25 Obstruction piece 250 Covering piece 260 Locking piece A Deck plate B. Drill bit C through hole D. Concrete E Hexagonal Socket F Equipment stand G fixing bolt H fixing nut

Claims

1. A deck plate insert that is inserted from above into a through hole opened in the deck plate and attached, an insert body in which a washer is attached to the outer periphery of the body of an anchor including a flange-shaped head and a body having a screw hole at a lower end thereof, and a coil spring is attached between the washer and the flange-shaped head to press the washer against the upper surface of the deck plate; The anchor includes a mounting portion having a threaded portion that screws into the screw hole of the anchor, and an engaging member having an expandable and contractible engaging piece integrally formed on the outer surface of the mounting portion, the engaging piece spanning the through hole and contacting the underside of the deck plate when the mounting portion is inserted through the through hole of the deck plate and attached to the outer surface of the mounting portion, An insert for a deck plate, characterized in that the engaging member fits into a socket of a rotary tool.

2. An insert for a deck plate as described in Claim 1, characterized in that the mounting portion has a blocking piece formed at the base end of the threaded portion having approximately the same diameter as the body portion of the anchor.

3. A deck plate insert that is inserted from above into a through hole opened in the deck plate and attached, an insert body in which a washer is attached to the outer periphery of the body of an anchor including a flange-shaped head and a body having a bolt shaft at a lower end, and a coil spring is attached between the washer and the flange-shaped head to press the washer against the upper surface of the deck plate; a cylindrical mounting portion having a detachable flexible piece disposed around the bolt shaft of the anchor; and an engaging member having an expandable engaging piece integrally formed on the outer surface of the mounting portion, the engaging piece spanning the through hole and contacting the underside of the deck plate when the mounting portion is inserted through the through hole in the deck plate and attached to the mounting portion, An insert for a deck plate, characterized in that the engaging member fits into a socket of a rotary tool.

4. An insert for a deck plate as described in Claim 3, characterized in that the mounting portion has a covering piece formed at its upper end having approximately the same diameter as the body portion of the anchor.

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