JPS6040314Y2 - Tool holding device for impact tools - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a tool holding device for an impact tool, and its purpose is to provide a tool holding device that allows easy attachment and detachment of tools and has a simple structure.

An example of this study will be described below with reference to the drawings.

In the figure, 1 is the impact tool body (hereinafter simply referred to as the body).

), 2 is a tool holder attached to the front end of the main body 1, and a guide hole a through which a tool 7 (the figure exemplifies a hammer drill) is inserted in a detachable manner is provided in the center of the tool holder in the axial direction. A pair of engagement holes 4 are formed symmetrically on the outer peripheral surface of the retainer 8 near its base end in order to engage the pin shaft 10 of the retainer 8.

Furthermore, a pair of thank-you sheet sheets 5.5 are recessed in the outer circumferential surface of the tool holder 2, and are arranged in parallel on the distal end sides of both the engagement holes 4, 4, and one side of the sheet surfaces 5.5. A steel ball 6 is fitted into the seat surface 5 (in this example, the upper side of FIG. 1).

A steel ball 6 is recessed into both seat surfaces 5, 5 so as to protrude from the tool holder 2, and is removable.

The tool 7 is inserted into the main body 1 through the tool holder 2 on its base end side, and is moved forward inside the main body 1 by striking the base end surface (top surface) of the tool 7 with an integrated hammer (not shown). It is possible.

Note that torque is transmitted from a drive mechanism (not shown) through the square shaft portion 7a located in the middle.

Reference numeral 8 denotes a tool holding retainer for preventing the tool 7 from falling off, and is integrally formed in a substantially U-shape from a substrate 8a and a pair of side plates 8b, 8b, as shown in FIG. An arch-shaped guide groove 9 opening toward the lower surface side is provided at the lower center thereof.

Therefore, it is possible to insert the small diameter portion 7b of the tool 7 without contact.

In addition, the tool 7 is prevented from falling off by the flange F protruding from the wall surface of the base plate 8a and the rear part of the shaft portion 7b, while the tool holder 2 is engaged with the inner wall surface of both side plates 8b, 8b. A pair of pin shafts 10 facing inward corresponding to the holes 4, 4.
10 is provided protrudingly by welding or the like, and the tool holder 2
When engaged with the engagement holes 4, 4, the retainer 8 can be rotated outward (see FIG. 3).

The engagement hole 11 is provided through the seat surfaces 5, 5 with a smaller diameter than the outer diameter of the steel ball 6, and can normally be engaged with the protruding portion of the steel ball 6.

Therefore, the rotational movement of the retainer 8 is restricted during the engagement.

Further, since the retainer 8 itself clamps the tool holder 2 by its elastic force, the retainer 8 can be held at any rotational position.

Next, the operation and effects of this embodiment configured as described above will be explained.

When replacing the tool 7 from the state shown in FIG. 1, first rotate the side plates 8b, 8b of the retainer 8 upward in the figure until the guide groove 9 is rotated to a position where it is not interfered with by the flange F of the tool 7. Therefore, the tool 7 can be easily extracted from the tool holder 2.

Conversely, when replacing another tool 7, that tool 7 can be easily fitted into the main body 1 and tool holder 2 in the reverse order.

That is, in this embodiment configured as described above, the tool can be easily replaced only by rotating the retainer 8, and the steel balls 6 interposed between the tool holder 2 and the retainer 8 can replace the tool. It is possible to restrict the rotation of the retainer 8 and prevent the tool 7 from falling off,
Furthermore, if the steel balls 6 and the locking holes 11 are worn out due to the rotational operation of the retainer 8, the locking holes 11 on the other side can be used, and the operability of the retainer 8 can be maintained for a long period of time. It also has

As described in detail above, the present invention has a tool holding position where the tool is held in the tool holder formed at the front end of the impact tool body using its own elastic force and can be moored to a part of the tool, and a tool holding position where the tool can be released. A tool holding device that prevents a tool from falling off using a substantially U-shaped retainer that is rotatably mounted between a tool holder and a tool release position. In order to hold the retainer in the tool holding position, the tool holder has seat surfaces perforated at multiple locations in a direction perpendicular to the axis, and at least one of the seat surfaces is fitted with a seat surface. Balls that can be repositioned are loosely fitted into the retainer, and the retainer is provided with locking holes corresponding to each seat surface to which the balls can be engaged.

Therefore, the tool can be easily attached and detached with an extremely simple configuration.

In addition, since the balls can be repositioned relative to each seat surface, even if a locking hole becomes worn out over time, the retainer can be operated by selecting a new locking hole. It has the effect of maintaining its properties for a long time.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention; FIG. 1 is a plan sectional view showing the main parts of the invention, FIG. 2 is a perspective view of the retainer, and FIG. 3 is an explanatory diagram showing the operation of the retainer. 1...impact tool, 2...tool holder, 7...tool, 8...retainer.

Claims (1)

[Scope of utility model registration request] In the tool holder formed at the front end of the impact tool body,
It is formed in a substantially U-shape and is rotatably mounted between a tool holding position where it is clamped with its own elastic force and can be moored to a part of the tool, and a tool release position where the tool can be released. A tool holding device that prevents a tool from falling off with a retainer, the tool holder having a direction perpendicular to the axis between the tool holder and the retainer to hold the retainer in a tool holding position. The seat surface is perforated at a plurality of locations, and balls are loosely fitted into at least one location of the seat surface, the position of which can be repositioned relative to the seat surface, and the retainer is capable of engaging each of the balls. A tool holding device for a striking tool, characterized in that a locking hole is provided corresponding to each sheet surface.