JP3006547U - Anti-slip processing tool for steel plate overlapping surface - Google Patents

Abstract

(57) [Summary] [Purpose] When steel plates are stacked and bolted together as a seam of steel materials, the steel materials will bend if the stacked steel plates are misaligned. The present invention provides a working tool for knurling around a bolt hole so that it will not slip at all when the bolt is tightened. [Structure] The handle part of the bolt hole diameter drilled in the steel plate part is fixed by protruding the blade part downward in the hole that penetrates the steel block up and down, and the knurled pieces on both sides of it so that the outer circumference comes out from the bottom surface of the block. A tool that is rotatably mounted around a horizontal pin. The upper part of the conical handle of the processing tool is gripped and rotated by a chuck, and when the bolt holes of the steel plate have been drilled, the knurled piece is immediately pressed against the steel plate and a knurled pattern is engraved. As a result, the knurled pattern is engraved around all the bolt holes in almost no time, and the steel plate will not slip when tightened with the bolts.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a processing tool that increases a friction coefficient of a mating surface so that the mating surface does not slip when the steel plates are overlapped and bolted together.

[0002]

[Background of device]

 In steel construction such as buildings and bridge girders, in order to join large steel materials, it is often the case that the flat parts are directly overlapped, or eye plates are overlapped and connected with bolts or rivets. At that time, first temporarily tighten the bolts with one or two bolts, and then temporarily tighten the other end of the steel material or an important part of the structure to confirm that the columns and beams are assembled without bending. Then many remaining bolts or rivets will be installed. When the seams are temporarily tightened with a small number of bolts as described above, the weight of the seams is applied to the seams, so the steel material may slip only in the gaps between the bolts and bolt holes, and sometimes stay in the gaps. Instead, the edges of holes in bolts or steel may be deformed and slip. In such a case, the pillars and beams will bend, so it will be necessary to lift up the steel material and re-tighten it again, and the construction will be significantly delayed and the construction cost will be greatly affected. This is because the frictional force of the steel contact surface due to temporary tightening is smaller than the load applied to that part, so either the tightening force of the bolt or the friction coefficient must be increased. However, since the tightening force of the bolt is limited, it is desirable to increase the friction coefficient. Since the surface of new steel is too smooth, it requires an inconvenient process of storage in the open until it rusts. The slip phenomenon described above is not limited to temporary tightening bolts, but the same tendency can be seen with main tightening bolts, although the effect is small.

[0003]

[Problems to be solved by the device]

 As described above, it is an object to increase the friction coefficient around the bolt holes on the contact surface for overlapping so that the bolt holes of the steel plate overlapping seam do not slip.

[0004]

[Means for solving problems]

 The present invention is a machining tool that increases the coefficient of friction by engraving concentric knurling patterns around the bolt holes of the steel plate lap joints so that slippage does not occur after tightening the bolts. Since the machining tool of the present invention continuously performs drilling and knurling pattern engraving, the handle part above the drill blade of the size of the hole of the steel plate to be drilled is a hole that vertically penetrates the center of the metal block. Insert the blades into the bottom of the block so that the blades protrude from the bottom surface, and knurled pieces are attached to both sides of the drill blades on the bottom surface of the metal block so that the outer periphery of the block protrudes from the bottom surface of the block so that they can rotate. It is a processing tool that is gripped and rotated by a drill press chuck.

Since the distance between the two knurled pieces changes depending on the thickness of the bolt, it is necessary to provide some kind of the above tool. The outer surface of the knurl may be a cylinder, but the operation is smoother if a part of the conical surface with the center of the bolt hole as the apex is used. Furthermore, when only knurling pattern engraving is performed, the drill can be removed from the above tool and a rod of the same shape can be used.

[0006]

[Action]

 Since the object of the present invention is to increase the friction coefficient of the steel plate overlapping portion contact surface of the bolt tightening portion, it is sufficient to form the unevenness only around the bolt. There is no problem even if the unevenness is small. If the knurled pattern is engraved on only one side and the other flat steel plate is tightened, the peaks of the pattern will bite into the mating steel plate, so it is not necessary to engrave the knurled pattern on both sides. If a drill is attached and used, it is possible to shift to knurling work at the same time when the drill penetrates the steel plate, so it is possible to perform knurling work without changing the time required for drilling only.

[0007]

EXAMPLE FIG. 1 is an example of various knurl patterns, and FIG. 2 is a cross-sectional view of a working tool incorporating a drill. Reference numeral 1 denotes a rectangular metal block, and a handle portion 3 of a drill 2 penetrates through a hole vertically passing through the center of the block, and a bolt in a tap hole 4 horizontally provided from the side surface of the metal block 1 toward the handle portion 3. The handle portion 3 is fixed to the metal block 1 by allowing the tip of the handle 5 to enter into the barbed portion 6 or the hole provided in the handle portion 3. The blade portion 7 of the drill has a diameter larger than that of the handle portion 3, and the upper end surface thereof is in close contact with the lower surface of the metal block 1. A knurling piece 8 is mounted on the lower surface of the metal block 1 by a horizontal pin 9 so that the outer peripheral portion of the knurling piece 8 is slightly protruded from the lower surface by sandwiching the drill blade portion 7. In such a structure, if the upper end of the handle 3 is grasped and rotated by a chuck such as a drilling machine, an electromagnetic fixed type mag ball or a portable electric drill, it will initially operate as a drill and after drilling, the drill blade 7 When is projected to the back side of the steel plate, the knurled piece continues to be pressed against the surface of the steel plate and rotates, so a knurled pattern is immediately engraved around the hole, increasing the friction coefficient of the steel plate surface around the hole. Therefore, when the bolt is tightened, slippage of the steel plate at that part does not occur.

[0008]

[Effect of device]

 Further, according to the processing tool of the present invention, it is possible to engrave a knurled pattern around the bolt holes by adding a little time to the drilling work of the steel plate, increasing the friction coefficient of the steel plate contact surface and assembling the steel material on site. Since construction can be performed with few mistakes, it will greatly contribute to the reduction of construction costs. From the perspective of the steel product shipping side, there is no need to open the field to rust the surface of the steel product, which saves the cost of managing the open field and the cost of unloading the vehicle.

[Brief description of drawings]

FIG. 1 is a plan view of an example of a knurled pattern.

FIG. 2 is a sectional side view of a processing tool.

[Explanation of symbols]

 1. Metal block 2. Drill 3. Handle 5. Fixing bolt 6. Sogi 7. Blade 8. Knurled piece

Claims (2)

[Scope of utility model registration request] 1. In order to continuously perform drilling and knurling, a handle portion above a drill blade having a dimension of a hole to be drilled is formed in a hole vertically extending through a center of a metal block.
Inserting and fixing so that the blade part protrudes from the bottom surface, and knurling pieces on both sides of the drill blade part on the bottom surface of the metal block, rotatably attached to the outer peripheral part from the bottom surface of the block and attached rotatably 2. A steel plate overlapping surface according to claim 1, wherein instead of said drill, a rod having the same shape as the drill is fixed to said block in order to perform knurling around the already drilled hole. Anti-slip processing tool