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Rotary impact screwdriver with a striking mechanism

An impact mechanism and screwdriver technology, applied in screwdrivers, power tools, manufacturing tools, etc., can solve problems such as hindering screw insertion, damage to the screw head of the screw, obstruction, etc., and achieve the effect of compact structure

Inactive Publication Date: 2014-01-29
ROBERT BOSCH GMBH
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  • Abstract
  • Description
  • Claims
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Problems solved by technology

[0003] The disadvantage of the prior art is that during the operation of such a rotary impact screwdriver, for example, when screwing a screw into the assigned object, there will be a corresponding pass when switching from the non-impact operation of the impact mechanism to the impact operation. Damage to the screw head of the screw occurs due to over-rotation of a plug-in tool such as a screwdriver head on the screw head
This may hinder or even hinder the complete screwing in of the screw

Method used

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Embodiment approach

[0041] According to one specific embodiment, the sensor element 162 has a current sensor. In this case, the operating parameters detectable by the sensor element 162 are, for example, at figure 1 The motor current flowing in the drive motor 114 . The motor current at figure 1 The rotational impact of the screwdriver 100 rises during operation if, for example, in so-called "hard" screwing situations figure 1 The workload on the insert tool 140 rises. Thus, for example, if the motor current exceeds a predetermined threshold value, the motor current can be detected on the basis of a current sensor of the control unit 164 , which is arranged, for example, in the feed line to the drive motor 114 determined on the appropriate for converting to figure 1 The switching time of the impact operation of the impact mechanism 122.

[0042] Additionally or alternatively, sensor element 162 has a torque sensor. In this case, an operating parameter detectable by the sensor element 162 is...

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Abstract

The invention relates to a rotary impact screwdriver (100), which comprises an impact mechanism (122) for driving an output shaft (124) and an operation mode switching element (123) for switching between a non-impact operation and an impact operation. The rotary impact screwdriver (100) is provided with a sensor element (162), which is structured for detecting the work reference of the rotary impact screwdriver (100), and is capable of testing the work reference and is used for determining the switching time of switching from the non-impact operation of the impact mechanism (122) to the impact operation.

Description

technical field [0001] The invention relates to a rotary percussion screwdriver with a hammer mechanism for driving an output shaft percussionally and with an operating mode changeover element for switching between non-percussion and percussion operation of the percussion mechanism. Background technique [0002] WO 2008 / 101556 A1 discloses such a rotary percussion screwdriver having a tool housing in which a mechanical percussion mechanism with a percussion body is arranged. An operating mode switching element is assigned to this mechanical striking mechanism, which serves to switch the striking mechanism between non-percussive and percussive operation. The operating mode switching element comprises a switching shaft which can be moved axially by actuating an actuating sleeve arranged rotatably on the tool housing and assigned to the operating mode switching element. A movement is made between a first position and a second position, wherein the first position is assigned to...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B25B21/02B25B23/00
CPCB25B21/02B25B23/1475
Inventor F.赫尔曼N.舍赫S.P.郭杨森德
Owner ROBERT BOSCH GMBH
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