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Electric hand tool machine

An electric tool and hand-held technology, which is applied in the field of hand-held electric machine tools, can solve the problems of large operating force, inappropriateness, large distance between the handle and the center of gravity of the machine tool, and achieve the effect of flexible holding position

Inactive Publication Date: 2009-01-28
ROBERT BOSCH GMBH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the large distance between the handle and the center of gravity of the machine tool, it is not conducive to placing the machine tool on the workpiece with the help of the handle with one hand, but this is still acceptable due to the light weight of the machine tool
For powerful hand-held circular saws that actually have a large saw blade diameter, this handle concept is to be abandoned because, on the one hand, placing the power tool flat on the workpiece with one hand requires unduly high operating forces and is unacceptable. weight; and on the other hand, the machine tool will inevitably have a large structural length, because the handle is located behind the protective cover

Method used

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  • Electric hand tool machine

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Embodiment Construction

[0013] The hand-held electric circular saw shown in different views in the drawings as an example of a general hand-held electric power tool for cutting or grinding workpieces has a two-half casing 10, which The body has an integrally formed handle 11 for guiding and operating the power tool and an electric motor housing 12 connected thereto, in which an air-cooled electric motor is accommodated. The electric motor drives a drive shaft 13 via a single-stage transmission (not shown), on which a circular saw blade 14 is clamped. The circular saw blade 14 is covered in its upper region by a protective cover 15 which is screwed onto the machine housing 10 . The guard 15 extends as far as a support plate 16 connected to the machine housing 10 , by means of which the machine tool is supported on the workpiece during sawing operation. The circular saw blade 14 protrudes through the support plate 16 and, depending on the desired cutting depth, protrudes more or less downward from the...

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Abstract

An electric hand tool machine, in particular a hand-held electric circular saw, comprises a machine housing 10, a rotatable tool, in particular a circular saw blade 14, and a handle 11, which is fixed on the machine housing and extends along a handle plane 18 parallel to a rotational plane 19 of the tool. In order to enable an optimum between a small machine length and good single-handed handling during application and guidance on the workpiece, the handle plane is situated between the rotational plane of the tool and a centre-of-gravity plane 20 parallel thereto and extending through the centre of gravity of the machine, wherein the distance of the handle plane from the rotational plane is minimized.

Description

technical field [0001] The invention relates to a hand-held electric tool machine, in particular to a hand-held electric circular saw machine. Background technique [0002] Hand-held electric power tools with a rotating tool, such as hand-held circular saws, have a handle whose center plane is offset relative to the rotating tool along the axis of rotation of the tool. In order to be able to operate the machine tool well, for example to place it on the workpiece and to carry it conveniently, the handle is arranged such that its middle or plane of symmetry, the so-called handle plane, is as close as possible to the center of gravity of the machine tool. An additional handle in the form of a knob enables two-handed operation of the power tool during the working process in order to be able to carry out precise straight cuts. However, the knob cannot be reached equally well in all working situations, which leads the operator to grasp other parts of the machine tool with a free ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B23D45/16B25F5/00B27B9/00
CPCB27B9/00
Inventor 乌尔里希·博内欧根·希尔德海科·勒姆
Owner ROBERT BOSCH GMBH