DE202008007384U1 - Device for the detachable connection of a sensor - Google Patents

Abstract

Housing for a sensor (2) for interchangeable support within an accessible by a gap opening groove with T-profile, with an L-shaped housing foot (18),
characterized in that
an insertion width (a) of the L-shaped housing foot (18) is smaller than a minimum groove throat width (B),
a housing foot height (b) is less than a minimum groove shoulder height (C),
a housing foot width (c) is smaller than a minimum groove throat width (B),
a width of a housing foot portion (e) is greater than a minimum undercut width (MinE) and smaller than a maximum undercut width (MaxE) of groove shoulders (E) and an insertion surface (i) opposite to the housing foot portion (e) is an obtuse angle (α) a housing bottom (h).

Description

The The invention relates to a device for releasable Connection of a sensor according to the preamble of claim 1, in particular a magnetic field sensor.

magnetic field sensors have to accurate position or distance measurement by non-contact Detecting a position of z. B. pneumatic or hydraulic piston proven within a working cylinder. For mounting The sensors are on the outer surfaces of a housing the working cylinder guide grooves mounted in which the magnetic field sensors are held axially adjustable. In a desired position in the longitudinal direction of the groove can the sensors by suitable means, for example screws, be arrested.

From the DE 295 18 474 U1 An arrangement for attaching a sensor to a carrier is known. In this arrangement, the groove has a dovetail-shaped cross-section. A holder comprises on its one longitudinal side a corresponding complementarily formed extension. By pivoting the holder through the opening of the groove, the holder can be positioned in the groove, wherein the extension engages in an undercut of the dovetail groove. Passing obliquely through the holder, a clamping screw with a conical foot is provided, which exits in the area of the lower edge of the holder opposite the extension. The conical taper of the clamping screw is designed to be able to engage in the, opposite the extension undercut of the dovetail groove. To set the holder in the groove, the conically tapered end of the clamping screw is supported both on a groove bottom and on the inclined groove wall forming the undercut. In this way, the clamping screw engages in the second undercut in order to fix the holder in the groove. By the clamping screw or by its conically tapered foot a settable extension is formed, so that the holder is held positively in the groove.

adversely in this prior art, however, that of This document known holder only in a single, the width and height of the holder adapted conforming groove used can be. To allow the Einschwenkvorgang limited itself a use of this prior art arrangement on such, in where the depth of the groove is low.

outgoing From this prior art, the invention is based on the object to provide an improved device for mounting a sensor, the simple and secure attachment of one and the same sensor allows in different sizes mounting grooves. Another object of the invention is to provide a usable volume of the sensor housing as large as possible form.

These Task is solved by a housing for a sensor for interchangeable support within a through a gap opening accessible groove with T-profile with an L-shaped housing foot, wherein an insertion width of the L-shaped housing foot smaller than a minimum Nuthalsbreite, a housing foot height smaller than a minimum groove shoulder height, a housing foot width is smaller than a minimum Nuthalsbreite, a width of a Gehäusefußabschnitts is greater than a minimum undercut width and smaller than a maximum undercut width of the groove shoulders and a housing foot portion opposite Insert surface has an obtuse angle opposite a housing floor.

Thereby, that the insertion width of the L-shaped housing foot smaller than a minimal Nuthalsbreite can be the housing by lateral tilting directly frontal in the Insert groove. By tilting back the sensor in the Groove the sensor is then held in the sensor. For this purpose, the Housing a housing foot on the height smaller than the minimum groove shoulder height. This can the housing foot in the inserted state, the groove shoulder engage underneath and pulling out the housing vertically to prevent the groove bottom without tilting the sensor.

In order to the sensor after tilting into the groove in a mounting position zurückkippbar is a housing foot width smaller than a minimum groove neck width. So the case is held securely at different grooves with T-profiles, the width of the housing foot portion is larger as the minimum undercut width and smaller than the maximum undercut width the groove shoulders. The housing foot with the housing foot section and the groove shoulder forms a positive connection in the inserted state in the groove.

Around to make the insertion width smaller than the minimum groove throat width, has a the Gehäusefußabschnitt opposite Insertion surface facing an obtuse angle on the housing floor. By this weird Sliding surface, the sensor can easily tilted frontal be introduced into the groove. The obtuse angle is there depending on the height and the width of the groove.

The housing of the sensor has to receive a corresponding evaluation unit on a part of the housing, which lies outside the groove. The housing part is wider than the groove width to accommodate necessary electronic components det. So that the sensor can nevertheless be tilted freely into the groove, a housing part surface is arranged at an acute angle to a housing floor. The acute angle is dependent on the degree of tilt necessary to introduce the housing in the groove. The angle is approximately formed by the function arctan (width of the housing foot section / groove height housing foot height) as a rotation angle.

Advantageous is a housing shoulder height greater as a maximum groove height. This ensures that that the housing foot portion under the Nutschulter can grab. Furthermore, this facilitates the tilting of the sensor, in which a part of the sensor protrudes beyond the groove.

In Development of the invention, the housing at least a thread on for diagonal receiving at least one fastening screw for Fixation of the housing. The fastening screw is included arranged so that it engages below the Nutschulter. Thereby is the sensor housing on the one hand on the groove bottom and the pushed others under the groove shoulder. The diagonal arrangement the fastening screw thus allows exercise of two forces in different directions for attachment of the sensor housing.

The Fixing screw is advantageously sunk in the housing. This results in no protruding edges. By doing so leaves Clean the sensor housing better. The fixing screw is further protected from damage and will not accidentally relaxed.

In Another embodiment has the end of the fastening screw a phase, whereby the housing on the one hand with the groove bottom and on the other hand forms a traction with the groove shoulder. By the attached phase can be the forces that are each distribute on the groove bottom and the groove shoulder, constructive be preset. Depending on the execution of the phase can the distribution of forces for different groove geometries be executed differently depending on the requirement.

Of the Sensor foot has curves and phases at the edges. As a result, the sensor housing is easier to insert into the groove. The curves and phases continue to produce manufacturing tolerances the groove geometry intercepted. Also pollution within the Groove in the edge areas are defined by the phases and curves tolerated.

In Continuing education is the housing after the extrusion process produced. As a result, the housing is particularly inexpensive and easy to produce.

In In a preferred embodiment, the sensor is a displacement measuring system or displacement sensor for pneumatic cylinders for detection the piston position with an inventive Housing formed. Such position measuring systems can Track distances to within a tenth of a millimeter. This is a complex evaluation required. To a precise position To capture, is a stable and permanent attachment according to the ensured by the present invention.

in the The invention is based on exemplary embodiments explained in detail with reference to the drawing. In the drawing shows:

1 a schematic cross-sectional view of a groove with T-profile.

2 and 3 a perspective view of a Wegmesssensors with inventive housing.

4 a schematic cross-sectional view of the housing according to the invention.

5 to 7 a schematic representation of the steps when inserting the housing in a groove with T-profile.

8th a schematic representation of a housing used in a groove.

1 shows a groove 16 with T-profile for attaching a sensor. Such grooves are arranged for example on the outside of pneumatic cylinders for attachment of position sensors or displacement sensors. For attachment, the groove has a groove width A, a Nuthalsbreite B, a Nutschulterhöhe C and a groove height D. The dimensions can be different from groove to groove.

at a pneumatic cylinder, the grooves are usually in the direction of Direction of movement of the piston. This allows a sensor at different piston positions along the piston path for distance measurement or position determination.

The sensor according to the invention is according to 2 shown in a perspective view. The sensor 2 has an elongated housing 4 on. Along the elongated case 4 are located in the lower area side by side arranged sensor elements for measuring the distance of a moving cylinder piston. The sensor elements are for this purpose as close as possible to the bottom of the sensor 2 arranged. The detectable path length essentially corresponds to the length of the sensor 2 , The housing se has at one end a recording 6 for a connection cable. At the respective ends are diagonal openings 8th provided with an internal thread for receiving a fastening screw. On top of the case 4 are display elements 12 and controls 14 intended.

3 shows a further complementary perspective view of the sensor 2 , This view shows the respective two openings 8th for the fixing screws.

The sensor according to the invention 2 for a groove 16 is in 4 shown schematically in the profile. The housing 4 has an L-shaped housing foot 18 with an insertion width a, a housing foot height b, a housing footage c, a housing shoulder height d and a housing foot width e. The insertion width a of the housing foot 18 is smaller than the Nuthalsbreite the groove 16 educated. This makes it possible, the housing in a tilted state directly frontal in the groove 16 introduce.

The insertion width a is smaller than a minimum Nuthalsbreite B, whereby the housing 4 by lateral tilting directly frontal in the groove 16 can be introduced. In order to make the insertion width a smaller than the minimum groove throat width B, an insertion surface i opposite the housing foot portion has an obtuse angle α with respect to the housing floor h. The obtuse angle α is dependent on the height and the width of the groove 16 ,

So that the sensor simply into the groove 16 can be tilted, a housing part surface g is arranged at an acute angle f to a housing floor h. The acute angle f is dependent on the degree of tilt necessary to the housing 4 in the groove 16 introduce. The angle f is approximately formed according to the function arctan (width of the housing foot portion e / groove height D-housing foot height b) as a rotation angle.

The housing 4 indicates the housing foot 18 , at the height b is smaller than the minimum Nutschulterhöhe C. This allows the housing foot 18 When engaged, engage under the groove shoulder and pull out the housing 4 perpendicular to the groove bottom without tilting the sensor 2 prevent.

So that the housing is securely held at different grooves with T-profiles, the width e of the Gehäusefußabschnitts 24 greater than the minimum undercut width MinE and smaller than the maximum undercut width MaxE of the groove shoulders. The housing foot 18 with the housing foot section 24 and the groove shoulder 20 forms a positive connection in the inserted state of the sensor 2 ,

5 to 7 shows the sensor 2 when inserting into a groove 16 with T-profile. First, the sensor 2 tilted along its longitudinal axis by an angle so that the surface i is aligned parallel to the groove walls. Due to this tilt is the sensor 2 directly frontal in the groove 16 insertable. This is in 6 shown. After the sensor 2 down to the groove bottom 22 in the groove 16 is introduced, the sensor becomes 2 tipped back into a final assembly position. This is in 7 shown. When tilting back the sensor 2 engages the L-shaped housing foot 18 under the groove shoulder 20 and forms with the groove shoulder 20 a positive connection, so that the sensor is no longer directly from the groove 16 can be pulled out.

For further attachment, the sensor 2 as in 8th represented by means of a diagonal through the housing 4 extending fastening screw 10 locked. The housing 4 indicates the mounting screw 10 an internal thread on. The fixing screw 10 is designed for example as a grub screw and can be retracted into the housing 4 Screw. The fixing screw 10 is arranged at an angle so that the end of the fastening screw 10 under the groove shoulder 20 picks up and the sensor 2 both against the groove shoulder 20 as well as the groove bottom 22 suppressed. For better distribution of forces, the fastening screw 10 a phase 26 on, whose inclination can be formed differently. For loosening or re-adjusting the sensor 2 the fixing screw is simply released and the sensor along the groove 16 moved or out of the groove 16 tipped out.

2

sensor

4

casing

6

admission

8th

openings

10

fixing screw

12

indicators

14

controls

16

groove

18

Case foot

20

groove shoulder

22

groove bottom

24

Gehäusefußabschnitt

26

phase

A

groove width

B

Nuthalsbreite

C

Nutschulterhöhe

D

groove height

Mine

minimum Undercut width

MaxE

maximum Undercut width

a

Entry width

b

Gehäusefußhöhe

c

Gehäusefußweite

d

Housing shoulder height

e

Gehäusefußbreite

f

Sharpener angle

G

Housing part surface

H

housing floor

i

male surface

α

angle

QUOTES INCLUDE IN THE DESCRIPTION

This list The documents listed by the applicant have been automated generated and is solely for better information recorded by the reader. The list is not part of the German Patent or utility model application. The DPMA takes over no liability for any errors or omissions.

Cited patent literature

• - DE 29518474 U1 [0003]

Claims (10)

Housing for a sensor ( 2 ) for interchangeable support within an accessible by a gap opening groove with T-profile, with an L-shaped housing foot ( 18 ), characterized in that an insertion width (a) of the L-shaped housing foot ( 18 ) is smaller than a minimum groove throat width (B), a case bottom height (b) is smaller than a minimum groove shoulder height (C), a case foot width (c) is smaller than a minimum groove throat width (B), a width of a case foot portion (e) is larger as a minimum undercut width (MinE) and smaller than a maximum undercut width (MaxE) of groove shoulders (E) and an insertion surface (i) opposite the housing foot portion (e) has an obtuse angle (α) to a housing bottom (h). Housing according to one of the preceding claims, characterized in that a housing part surface (g) at an acute angle (f) to a housing floor (h) is arranged. Housing according to claim 1, characterized a housing shoulder height (d) is greater as a maximum groove height (D). Housing according to one of the preceding claims, characterized in that the angle (f) is approximately after the function arctan (width of the housing foot section (e) / Groove height (D) -House foot height (b)) is formed as a rotation angle. Housing according to one of the preceding claims, characterized in that the housing ( 4 ) has at least one thread for the diagonal receiving at least one fastening screw ( 10 ) for fixing the housing ( 4 ). Housing according to one of the preceding claims, characterized in that the fastening screw ( 10 ) in the housing ( 4 ) is sunk. Housing according to one of the preceding claims, characterized in that the end of the fastening screw ( 10 ) a phase ( 26 ), whereby the housing ( 4 ) on the one hand with a groove bottom ( 22 ) and the other with the Nutschulter ( 20 ) forms a frictional connection. Housing according to one of the preceding claims, characterized in that the housing foot ( 18 ) has curves and phases at the edges. Housing according to one of the preceding claims, characterized in that the housing ( 4 ) can be produced by the extrusion process. Position measuring system or displacement sensor for pneumatic cylinders for detecting the piston position with a housing ( 4 ) according to any one of the preceding claims.