DE102005063187A1 - Screwdriver e.g. battery screwdriver, has screw tool magnetized in controllable manner in its contact area with permanent or electromagnet or electronic units to produce magnetic force, where contact area is assigned to screw - Google Patents

Abstract

The driver has a screwing tool for synchronization engagement in a screw and designed as a blade or a changeable bit, where the blade is provided with a handle. The screw tool is magnetized in a controllable manner in its contact area with corresponding units such as permanent and/or electromagnet and/or electronic units for generating magnetic force, where the contact area is assigned to a screw, and the magnetization of the unit is strongly or weakly adjustable.

Description

State of the art

Disclosure of the invention

The The present invention is based on a screwing tool after Preamble of claim 1.

It are already magnetized screwdrivers, such as screwdrivers or Screw inserts (for example "bits" for cordless screwdrivers) known in which a screw against unwanted loosening during the Screwing is secured. While the screw remains in the general reliable stick to the magnetized screwing tool.

• – in eine Öffnung geschraubt werden, neben der sich eine magnetisierbare Umgebung (z.B. eine metallische Gehäusewand) befindet, ist es unter Umständen kaum möglich die Schraube in die eigentliche Offnung zu führen, da sie ständig an der Umgebung haften bleibt,
• – aus einem Behälter mit einer Vielzahl anderer Schrauben geholt werden, so bleiben je nach Stärke der Magnetisierung mehr oder weniger viele andere Schrauben haften, was manuelles Eingreifen erforderlich macht und damit den Arbeitsfluss deutlich bremst.
• – lediglich in eine dafür vorgesehene Öffnung geführt werden, aber erst nach einer endgültigen Justage der zu verschraubenden Teile verschraubt werden (um z.B. bei einer mit mehreren Schrauben zu fixierenden Platten das Verspannen der Teile zu verhindern), so ist es nicht möglich die Schraube gezielt vom Schrauber-Bit zu lösen.
• – gelöst werden und diese anschließend gezielt abgelegt werden, so ist das meist nur durch Verwenden einer geeigneten Abstreifkante oder nur manuell möglich, wodurch der Arbeitsfluss deutlich gebremst wird.
• – neben einem magnetisierungsempfindlichen Bauteil montiert werden, muss das Werkzeug gewechselt werden, wenn es zuvor für eine unkritischere Montage verwendet wurde. Der Wechsel wird unter Umständen vergessen, wodurch Schäden am empfindlichen Bauteil entstehen können.

However, this has the following disadvantages when using a magnetized screwdriver bit a screw

• - be screwed into an opening, next to which there is a magnetizable environment (eg a metallic housing wall), it is under certain circumstances hardly possible to guide the screw into the actual opening, since it constantly adheres to the environment,
• - be fetched from a container with a variety of other screws, so depending on the strength of the magnetization more or less many other screws adhere, which makes manual intervention required and thus significantly slows down the workflow.
• - Are only performed in a designated opening, but only after a final adjustment of the parts to be screwed are screwed (to prevent, for example, in a fix with several screws plates clamping of the parts), so it is not possible the screw specifically from To solve screwdriver bit.
• - be solved and these are then stored selectively, it is usually only possible by using a suitable wiper edge or only manually, whereby the workflow is significantly slowed down.
• - be mounted next to a magnetization-sensitive component, the tool must be changed if it was previously used for a less critical assembly. The change may be forgotten, which can cause damage to the sensitive component.

Advantages of invention

The Invention with the features of claim 1 relates to a screwdriver, or a screw insert whose magnetization strength controllable / adjustable is, for example, by turning on / off the magnetization. Of the Screwdriver is particularly safe, fast and convenient by one-hand operation adjustable and manageable. As a result, screws are selectively retained and targeted between other screws without the use of other means can be stored. Further, screws are securely inserted into a designated opening and even without fixing the wrench tip without use others Medium solvable.

at A magnetizable environment is the strength of the screwdriver tip Maghnetisierung so far reducible, that just kept the screw, the influence of the environment but negligible becomes.

By Reduction in magnetization strength is The screwdriving even in magnetically sensitive environments without Tool change possible.

screw can in a set of other screws by reducing the magnetization strength individually be taken out with the screwdriver tip, without use others Medium.

drawing

below the invention with reference to an embodiment with associated description is explained in more detail.

It demonstrate

1 a hand screwdriver with electromagnetic magnetization

2 a hand screwdriver with permanent magnetic magnetization and

3 a cordless screwdriver with electromagnetic magnetization.

Description of the embodiment

1 shows a mechanical screwdriver with a blade provided with a handle. The handle takes, preferably inside, a battery and carries a switch. By means of the switch, a magnetization coil integrated in the screwdriver blade can be activated by energizing the magnetization coil by closing the circuit and thus enabling the electrical magnetization to be switched. The power source is formed by a battery. Within the magnetization coil, a magnetic field is built up during current flow, by means of which a screw is at least held or attracted to the tip of the blade. In an unillustrated embodiment of the invention, the magnetization is generated by electronic means.

2 shows a screwdriver with a provided with non-magnetizable handle blade and mechanically switchable magnetization, wherein the magnetization takes place by closing a gap after pressing the switch at the handle end between a permanent magnet and a magnetizable rod, which also forms the blade of the screwdriver .. The rod is when closing the gap also magnetic and thus exerts an attraction on screws at least at the top of the blade. When the switch is released, the magnetizable rod and the permanent magnet are separated again, the gap opens and the magnetic force at the tip of the blade goes to a minimum or to zero. In a further, unillustrated embodiment variant, the complete blade is designed magnetizable.

The screwdriver according to 2 can be implemented by simple means, for example, by a suitable cylindrical, in particular designed as a rotating part plastic blank for rotationally fixed attachment to the blade, in the over its entire length a guide is drilled with two different diameters. From the handle end, the return spring and the permanent magnet is inserted, glued from the blade side, a metal rod with a screwdriver tip. An end cap with button can be glued on.

3 shows a cordless screwdriver with a housing that receives a battery, a motor with motor switch and a gearbox and a magnetizable chuck for receiving a screw. The cordless screwdriver is also provided with a hand-operated magnetization switch with pressure spring, a magnetizing coil, a magnetizable rod and motor switch. The magnetizable rod is pressed against a "bit" in the chuck by a pressure spring and thus magnetizes the bit when the magnetization switch is actuated and the battery is connected to the magnetizing coil, thereby magnetizing the bit and attracting magnetically sensitive metallic screws a suitable coupling of the power supply to the magnetizing coil (eg sliding contacts), the magnetization is maintained even when the engine is operated after the engine switch is pressed or can also be switched off when required.

The magnetization strength can in the mechanical screwdriver according to 1 or 2 For example, by means of a suitable device in the handle, or set or switched in the blade. In an electric screwing device, for example, as a suitable device next to the switch for starting the turning operation. This makes one-hand operation possible in all cases. The magnetization can be electrically (eg 1 ) or mechanical (eg 2 ) respectively.

Claims (3)

Screwdriver with a, in particular as a blade or, preferably exchangeable bit, designed, screwing for entrainment into a screw, characterized in that the screwing in its associated with a screw screw engaging portion with appropriate means, such as permanent and / or electromagnet and / or electronic means for generating a magnetic force is switchable magnetizable. Screwdriver according to claim 1, characterized that the magnetization of the means selectable switched on and / or off is. Screwdriver according to claim 1 or 2, characterized that the magnetization of the means more or less adjustable is.