JPH03107606A - Assembling unit composed of expansible anchor and assembling bit - Google Patents

Abstract

PURPOSE: To improve work efficiency without the fall of a driving tool by engaging an annular tooth row formed at the shaft part side end face of an assembling bit, with a shoulder projecting inward from an internal thread in the shaft part. CONSTITUTION: A shoulder 26 is formed to project inward from an external thread 6 thread-fastened to a bolt 3 with an enlarged cone 4 of a shaft part of an expansion anchor 2, and an annular tooth row to be engaged with the shoulder 26 is formed at the shaft part 5 side end face of an assembling bit 1. A driving tool is therefore prevented from falling, and work efficiency can be improved by a combination of the expansion anchor expansive by the rotation of the shaft part 5 and the assembling bit 1 that can be assembled to a power hammer drill.

Description

Detailed Description of the Invention [Industrial Field of Application] The present invention provides an expansion anchor, and a drill mount of a hammer drill machine or the like is chucked to a part and engaged with the expansion anchor to undercut the engagement anchor. The assembly is a unit consisting of a bit for anchoring in a borehole with a section, the expansion anchor being connected to a shaft section with an internal thread and an expansion sleeve until the expansion anchor is screwed into the thread. It relates to a type of device comprising a threaded bolt passing through the threaded bolt and an expansion cone provided at the end of the threaded bolt.

BACKGROUND OF THE INVENTION It is known to use driving tools that can be chucked, in particular on electric hammer drills or percussion drilling machines, for fixing enlarged sea lions in boreholes in wall structures.

The driving tool essentially consists of a hardened steel sleeve, through which the percussion action of the percussion drilling machine is transmitted to the sleeve of the expansion anchor. However, a disadvantage identified with the known driving tools is that during operation of the percussion drilling machine, the driving tool often falls out of the percussion drilling machine and has to be repeatedly interrupted and reinstalled. An expansion anchor assembled with such a driving tool is disclosed in West German Patent Application No. 363443.
It is disclosed in the specification of No. 1.

It also has a rotatable shaft portion, and the expansion sleeve is pushed over the expansion cone by rotation of the shaft portion,
Expansion anchors are also known in which the expansion sleeve is expanded, and for this purpose the shaft portion is rotated manually using a screwdriver or the like.

[Problem to be Solved by the Invention] The problem to be solved by the present invention is to use an expansion anchor that can be expanded by rotating a shaft portion and a bit for assembling a single structure that can be chucked into an electric hammer drill, for example. Such assembly is to provide a unit.

Means for Solving Problem 1] The constituent means of the present invention for solving the above problem is that when the expansion anchor is assembled near the shaft part, an annular tooth row is formed on the end face side of the bit, and the tooth row is is in engagement with a shoulder projecting inwardly from the female thread within said shaft portion.

[Action 1] During assembly, the annular tooth row formed on the bit (the teeth of the annular tooth row can protrude toward the end face of the shaft portion of the expansion anchor) is sometimes attached to a shoulder within the shaft portion. engages and rotates the shaft portion. As a result, the expansion sleeve of the expansion anchor interposed between the shaft portion and the expansion cone is pressed over the expansion cone, and expands as a result of this pressing, ultimately resulting in contact with the wall. A form-fitting connection occurs. When further expansion becomes impossible,
Since rotation of the shaft part is no longer possible, at the time when the shaft part cannot rotate, the annular tooth row of the bit will idle along the shoulder during assembly. By selecting the flank inclinations of the teeth of the annular toothing accordingly, it is possible for the assembly to determine the maximum transmittable torque from the bit to the shaft part at a high value or at a relatively low value. . Advantageously, the shoulder has an inclined narrow annular surface as abutting surface for the assembly bit.

[Embodiment] Next, an embodiment of the present invention will be described in detail with reference to the drawings.The illustrated assembly unit consists of a bit l and an expansion anchor 2, the expansion anchor being a threaded bolt having an expansion cone 4. 3
It is equipped with

The threaded bolt 3 has penetrated into the shaft portion 5, and the female thread 6 of the shaft portion is threaded!・Screwed into 3. An axially movable expansion sleeve with an expansion segment 8 is provided between the shaft part 5 and the expansion cone 4 .

For assembly, the bit 1 has a shank 9, which is chucked into an electric hammer drill (not shown) or the like. For assembly, a plurality of teeth 28 are arranged on the end surface 10 of the bit l near the shaft portion 5, which are distributed in an annular tooth row along the outer periphery.
is configured, and when assembled, the teeth are attached to the shaft portion 50.
said shaft portion 5 until it abuts a radially inwardly directed shoulder 26
introduced into the world. The shoulder 26 extends inwardly from the female thread 6 and forms an inclined narrow ring surface 27 as an abutting surface. The teeth 28 are attached to the ring surface 27 when assembled.
Since it is crimped to the metal ring surface 27, it bites into the metal ring surface 27 at least slightly. If you now turn assembly dot 1,
At the same time, the shaft portion 5 of the expansion anchor 2 also rotates.

During assembly, when the electric hammer drill with the bit l chucked is switched to impact drilling and operated, the impact force in the axial direction is shoulder 26.
This additionally acts on the expansion anchor 2, which greatly facilitates twisting when driving the expansion anchor 2 into the borehole of the wall.

As soon as the expansion cone 4 comes into contact with the water bottom of the borehole 13, the tips of the teeth 28 bite into the ring surface 27, so that the shaft portion 5 is rotated.

The expansion cone 4 with the threaded bolt 3 then does not rotate together with the shaft part 5 due to the friction existing between the expansion cone 4 and the water bottom, so that the shaft part 5 expands in the axial direction. It is screwed onto the threaded bolt 3 toward the open cone 4. The expansion sleeve 7 of the shaft part 5 is then pushed over the expansion cone 4 and expanded accordingly, so that the expansion segment 8 fits positively into the undercut 17 of the borehole.

FIG. 2 is a partially cutaway diagram of an example.

1...Assembling bit, 2...Expansion anchor, 3...
Threaded bolt, 4... Expansion cone, 5... Shaft portion, 6... Female thread, 7... Expansion sleeve, 8...
Expansion segment, 9...shank, lO... end face,
17...undercut part, 26...shoulder, 27...
・Ring surface 28...teeth

Claims (1)

[Claims] 1. The expansion anchor (2) is chucked to a drill attachment part of a hammer drill machine, etc., and is engaged with the expansion anchor (2) to fix the expansion anchor in the borehole having the undercut part (17). Assembly bit (1
), the expansion anchor (2) comprising a shaft portion (5) having an internal thread (6) and an expansion sleeve (7) until the expansion anchor (2) is screwed into the internal thread (6).
In the case of a type equipped with a threaded bolt (3) passing through the threaded bolt and an expansion cone (4) provided at the end of the threaded bolt, the expansion anchor (2) near the shaft part (5) An annular tooth row (28) is formed on the end face side of the assembly bit (1), and the tooth row extends inwardly from the internal thread (6) within the shaft portion (5) at a shoulder (26). An assembly unit comprising an expansion anchor and an assembly bit, characterized in that the assembly unit is engaged with an expansion anchor and an assembly bit. 2. The shoulder (26) is attached to the assembly bit (
2. The assembly unit according to claim 1, further comprising an inclined ring surface (27) as the abutment surface of step 1).