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Impact power tool

A work tool and impact technology, applied in the field of impact work tools, can solve problems such as difficulties

Active Publication Date: 2010-05-12
MAKITA CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

That is, in the structure of the conventional rubber ring, the rubber ring is required to have different properties, and it is difficult to set the hardness that can satisfy both functions.

Method used

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Experimental program
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no. 1 approach

[0029] Hereinafter, for the first embodiment of the present invention, refer to Figure 1 to Figure 5 Describe in detail. This embodiment will be described using an electric hammer drill as an example of an impact working tool. figure 1 It is a side cross-sectional view showing the overall structure of the electric hammer drill according to the present embodiment, and shows a state where the hammer drill is pressed against a load to be processed. Such as figure 1 As shown, generally speaking, the main structure of the hammer drill 101 according to this embodiment includes: a main body part 103 forming the outer contour of the hammer drill 101 , and a front end area of ​​the main body part 103 which is detachably mounted via a tool holder 137 A hammer bit 119 (on the left side in the figure) and a handle 109 connected to the side opposite to the hammer bit 119 of the main body 103 are held by an operator. The main body portion 103 corresponds to the "tool main body" of the p...

no. 2 approach

[0052] Below, for the second embodiment of the present invention, refer to Figure 6 ~ Figure 8 It will be described. This embodiment is configured so that the reaction force (recoil) at the time of striking is transmitted from the hammer bit 119 to the shock absorber 161. Except for this structure, it is the same as the structure of the above-mentioned first embodiment. Therefore, in Among the components shown in the illustration, the same symbols are used for the components having the same structure as those in the first embodiment, and their descriptions are omitted or simplified. In this embodiment, the axial central portion of the impact pin 145 is the large-diameter portion 145a Small-diameter portions 145b and 145d are respectively provided on the rear side and the front side of the large-diameter portion 145a. In addition, a tapered portion 145c is formed at the boundary between the small-diameter portion 145b and the large-diameter portion 145a on the rear side, and th...

no. 3 approach

[0061] Hereinafter, for the third embodiment of the present invention, refer to Figure 9 ~ Figure 13 Describe in detail. This embodiment is a structure in which a runaway prevention mechanism is further added, and the structure is the same as that of the above-mentioned first embodiment except for this structure. Therefore, among the components shown in the drawings, the same symbols are used for the components having the same components as those of the first embodiment, and descriptions thereof are omitted or simplified.

[0062] The hammer drill 101 according to the present embodiment includes a lost strike prevention mechanism 181 that prohibits the striking action of the hammer bit 119 when the drive motor 111 is energized and driven in a no-load state in which the hammer bit 119 is not pushed backward. The air chamber 141a of the impact hammer 143 is driven by the action of the air spring to communicate with the outside through the breathing hole 141b. The lost driving...

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PUM

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Abstract

The invention provides a technique of reducing impact force due to the bounceback of a bit after hammering operation in an impact type work tool. The impact type work tool has a tool body, hammer actuating members for executing the hammering operation, drive mechanisms for driving the hammer actuating members and an impact damper for absorbing the impact due to the bounceback after the hammering operation. The impact damper has a weight that receives reaction force transmitted from the hammer actuating members at a reaction force transmitting position where the weight is placed in a state of directly contacting the hammer actuating members or in a state of contacting the hammer actuating members via a hard metal-made intervening member against the reaction force received from the workpiece, and also, an elastic element that is elastically deformed while being pushed with the weight moved backward due to the transmitted reaction force and absorbs the reaction force transmitted to the weight with the elastic deformation.

Description

technical field [0001] The present invention relates to an impact type work tool for performing linear hammering work on a workpiece, capable of alleviating the reaction force received from the workpiece during the hammering work. Background technique [0002] Japanese Patent Application Laid-Open No. 8-318342 discloses a technique for alleviating the impact force generated by the recoil of the drill bit after the striking operation in the hammer drill. In this hammer drill, a rubber ring (cushioning member) exists between the axial end surface of the cylinder as the main body side member and the impact pin as the intermediate member that applies a blow to the drill bit. Then, after the striking operation of the drill bit, the drill bit recoils due to the reaction force received from the workpiece, and when the impact bolt hits the rubber ring, the impact force is alleviated by the deformation of the rubber ring. On the other hand, the rubber ring also acts as a positioning...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B25D17/24
Inventor 青木阳之介
Owner MAKITA CORP