DE8715809U1 - Switch for the limit switch of an electrically operated device - Google Patents

Description

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Patent Attorney * · · « . * · Osnlngstraße 10

Dipi.-ing- Siegfried Schirmer . SSSS21053

Authorized representative Fax (05 21) 210 54

Before the European Patent Office ₀ ^ , .

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- S-893/77-32

Applicant:

Erwin Müller GmbH & Co.
Bresciaüer Straße 34 - 38
4450 Lingen

Switch for the limit switch of an electrically operated device

The invention relates to a switch for the limit switch of an electrically operated device, in particular a device for driving in tacks and fasteners, with a single button that is forcibly guided in a switch housing and actuated by a magnetic armature*

Switches of the type shown are known for both manual and fully automatic operation. The difficulty with fully automatic operation is that the magnetic armature hits the switch at a relatively high speed and this impact speed is transmitted and has a negative effect on the electrical connections.

The invention is based on the object of designing a switch for switching off an electrically operated device in such a way that it is able to slow down the speed of the impacts of the magnetic armature to zero while requiring a minimum of mass.

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This task is solved in accordance with the invention in that the individual button is made of elastic material and has a contact surface to which a circuit board connected to the electrical supply line is assigned, whereby the individual button has an upper cylindrical part to which a wall in the form of a hollow truncated cone widens conically downwards. The upper cylindrical part of the individual button expediently protrudes partially from the switch housing. The individual button can be made of silicone and the switch housing of an impact-resistant, non-conductive material, preferably plastic.

The contact surface of the individual button is advantageously made of graphite or graphite-permeated material*. In an embodiment of the invention, the ratio of the diameter of the cylindrical part to the larger diameter of the truncated cone-shaped wall is approximately 1:2 to 1:3, whereby the heights of the cylindrical part and the truncated cone-shaped wall are approximately the same. The interior of the switch housing with the individual button and the circuit board with the soldered strands is cast, preferably with silicone.

Further expedient embodiments of the invention are shown in the dependent claims.

Due to the design of the switch according to the invention, the relatively high impact speed of the magnetic armature on the individual button and the surface of the switch body can be slowed down from 12 m/sec to zero, so that the

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The stranded wire connection on the circuit board is protected against any negative impact.

In addition to the choice of materials, the shape of the individual button and the size ratios of the impact surfaces of the switch housing and the individual button are particularly important.

An embodiment of the invention is shown in the drawing and is explained in more detail below. Shown are: 10

Fig. 1 is a vertical section through a switch;

Fig. 2 is a plan view of a switch; Fig. 3 is a vertical section through a single button;

Fig. 4 a bottom view of a circuit board with soldered strands and

Fig. 5 is a top view of a circuit board.

A single button 1 made of silicone is mounted in a switch housing 5 made of impact-resistant plastic. The single button 1 has an upper cylindrical part Γ, to which a conically downwardly widening wall 1 ¹¹ in the form of a hollow truncated cone is connected, whereby the upper cylindrical part 1' partially protrudes from the switch housing 5. The lower end of the wall 1 ^M is formed by two horizontal and one vertical surface, which creates a reinforcement in the form of

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a circular ring. In the individual button 1 according to Fig. 3, the ratio of the diameter of the cylindrical part Γ to the larger diameter of the frustoconical wall 1' ¹ is approximately 1:2.5 and the height of the cylindrical part Γ to the height of the frustoconical wall 1' ¹ is approximately 1:1. The surface of the switch housing 5 also contributes to the braking of the impact speed of the magnet armature, the diameter of which is approximately 6:1 to the diameter of the individual button 1.

On the underside of the cylindrical part ¹¹ of the individual button 1 there is a contact surface 2 which is made of graphite or a graphite-permeated material. The contact surface 2 is assigned a circuit board 4 to which the electrical supply line 3 is soldered in the form of strands. The strands are guided in a spiral shape on the inside of the switch housing 5. The individual button 1 and the circuit board 4 with the soldered strands are inserted as a unit into the interior of the switch housing 5, which is cast with silicone to prevent bubbles. The strands are guided to the pulse generator via a side outlet of the switch housing 5.

As can be seen from Fig. 4 and 5, copper conductor tracks 6 are laminated onto the top and bottom of the circuit board 4, whereby the holes 7 present in the circuit board 4 are continuously contacted.

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List of reference symbols:

1 single button

1' cylindrical part 1' ' wall

2 Contact surface

3 electrical supply line

4 Circuit board

5 Switch housing

6 copper conductor tracks

7 holes

Claims (1)

Patent Attorney'■""■"" ? _Q ^s Ä ^t , ^ra ! ³ ?J? _.. , , &mdash;. , . . &mdash; , . 4800Bielefeld 1 Dipl.-lng. Siegfried Schirmer Telephone (0521)21053 Authorized representative Fax (05 21) 210 54 before the European Patent Office 23.11.1987 893/77-32 Applicant: Erwin Müller GmbH & Co
Breslauer Street 34 - 38
Lingen Protection claims: 1. Switch for the limit switch of an electrically operated device, in particular a device for driving in stapling and fastening means, with a single button which is positively guided in a switch housing and which is acted upon by a magnetic armature, characterized in that the single button (1) is made of elastic material and has a contact surface (2) which has a contact with the electrical supply line (3) connected circuit board (4). 10 2. Switch according to claim 1, characterized in that the individual button (1) has an upper cylindrical part (1') to which a conically downwardly widening wall (1 ¹¹ ) in the form of a hollow truncated cone is connected. 3. Switch according to claim 1 or 2, characterized in that the upper cylindrical part (V) of the individual button (1) partially protrudes from the switch housing (5). - 2 - 893/77-32 4. Switch according to one of claims 1 to 3, characterized in that the egg-shaped button (1) is made of silicone. 5. Switch according to one of claims 1 to 4, characterized in that the lower end of the frustoconical wall (Γ ¹ ) is formed by two horizontal and one vertical surface. 6. Switch according to one of claims 1 to 5, characterized in that the contact surface (2) consists of graphite or graphite-permeated material. 7. Switch according to one of claims 1 to 6, characterized in that the contact surface (2) is arranged on the underside of the cylindrical part ( ¹¹ ). 8. Switch according to one of claims 1 to 7, characterized in that the diameter of the cylindrical part ( ¹¹ ) to the larger diameter of the frustoconical wall [V') is approximately 1:2 to 1:3. 9. Switch according to one of claims 1 to 8, characterized in that the heights of the cylindrical part (1 ¹ ) and the frustoconical wall (1 ¹¹ ) are approximately equal. &bull; I I* »·f* 4* 4 » «4 44·* &bull; i* *4 · · 4r · 4iii 4 * «*< 893/77=32 10» Switch according to one of claims 1 to 9» characterized in that the switch housing (5) is made of an impact-resistant, non-conductive material« 5 11» Switch according to claim 10, characterized in that the switch housing (5) is made of plastic, 12. Switch according to one of claims 1 to 11, characterized in that the electrical supply line (3) is guided in the form of helically guided strands below the printed circuit board (4). 13* Switch according to one of claims 1 to 12* characterized in that the strands rest on the inside of the switch housing (5). 14. Switch according to one of claims 1 to 13, characterized in that the stranded wires are soldered to the underside of the printed circuit board (4). 15. Switch according to one of claims 1 to 14, characterized characterized in that the single button (1) and the printed circuit board (4) with the soldered wires as Unit is inserted into the switch housing (5). · 16s Switch according to claim 15, characterized in that the interior of the switch housing (5) is cast with the parts used as a unit, preferably with silicone. i ··· ti i · t
&bull; i · - 4 - 893/77-32 17* Switch according to one of claims 1 to 16, characterized in that the strands are led to the pulse generator via a lateral outlet of the SG holder housing (B).
5 18. Switch according to one of claims 1 to 17, characterized in that copper conductor tracks (6) are laminated onto the top and bottom of the circuit board (4). 19. Switch according to one of claims 1 to 18, characterized in that the holes (-7) present in the printed circuit board (4) are continuously contacted. 20. Switch according to one of claims 1 to 19, characterized in that the diameter of the individual button (1) to the diameter of the switch housing (5) is approximately 1:6* - Description -