DE102014212257A1 - Sensor holding device with a retaining strip and a retaining clip - Google Patents

Abstract

The invention relates to a holding device (30) for fastening a sensor (31) to a housing (12) of a linear movement device (10), wherein the housing (12) extends with a constant outer cross-sectional shape in a longitudinal direction (11), wherein the holding device ( 30) has a separate retaining strip (50) with at least one undercut groove (51), wherein the retaining strip (50) extends with a constant cross-sectional shape in the longitudinal direction (11). According to the invention, the holding device (30) has at least one separate holding bracket (70), wherein the holding bracket (70) has a base (71) extending transversely to the longitudinal direction (11), wherein the base is screwed to a first clamping screw (32) is, whose end face (33) rests against the retaining strip (50), wherein the at least one retaining bracket (70) has two legs (72) which project perpendicularly from the base (71), so that they surround the housing (12), wherein at least one leg (72) with a second clamping screw (34) is screwed, the end face (35) on the outside of the housing (12) rests, so that the housing (12) between the two legs (72) can be clamped.

Description

The invention relates to a holding device according to the preamble of claim 1.

On the website on 11.06.2014 under the Internet address http://www.festo.com/cms/de-ch_ch/21479.htm was retrievable, a holding device for mounting a sensor to a housing of a linear motion device is disclosed under the heading "Accessories". The linear motion device is an electric cylinder having a housing extending in a longitudinal direction with a constant outer cross-sectional shape. The holding device comprises a retaining strip, which is referred to as a "sensor strip". The retaining strip has an undercut groove and extends with a constant cross-sectional shape in a longitudinal direction. In the undercut groove sensors, such as inductive proximity switches or reed contacts, can be attached, with their position can be adjusted continuously in the longitudinal direction. The retaining strip is glued to the housing of the linear motion device. This adhesive bond may erase when the linear motion device comes in contact with liquid.

The object of the invention is to provide a holding device which does not come loose when it comes into contact with liquids. Next, the retaining strip to be attached to the housing of the linear motion device without play and even if the dimensions of the housing are subject to manufacturing tolerances.

According to the independent claim, it is proposed that the holding device has at least one separate holding bracket, wherein the holding bracket has a base which extends transversely to the longitudinal direction, wherein the base is screwed to a first clamping screw, the end face of which bears against the retaining strip, wherein the at least a headband has two legs, which project perpendicularly from the base, so that they surround the housing, wherein at least one leg is screwed to a second clamping screw, the end face of the outside of the housing, so that the housing can be clamped between the two legs. With the second clamping screws of the headband is clamped to the housing. With the first clamping screw, the retaining strip is clamped to the housing, wherein the corresponding clamping force on the headband and the at least one second clamping screw is supported on the housing. The axis of rotation of the first clamping screw is preferably aligned transversely to the base. The axis of rotation of the second clamping screw is preferably aligned transversely to the associated leg. Preferably, the clamping forces of the first and second clamping screw are chosen so large that results in a plastic deformation of the retaining strip or on the housing. This results in a positive engagement, which can transmit high forces. The first and / or the second clamping screw are preferably secured against loosening, most preferably by means of an adhesive. The retaining strip and / or the at least one retaining clip are preferably made of aluminum. The retaining strip is preferably produced by extrusion. The two legs preferably each have a free end facing away from the base. But it is also conceivable that the Haltebügelt surrounds the housing ring-like, so that the legs are connected to each other at both ends. The second clamping screw is preferably arranged at a free end of the associated leg.

In the dependent claims advantageous refinements and improvements of the invention are given.

It is preferred that two or more identical retaining clips are provided, which are assigned to the same retaining strip. As a result, the retaining strip is held particularly firmly on the housing. The two ends of the retaining strip is preferably assigned in each case a separate headband, which is most preferably arranged at a small distance from the associated end of the retaining strip.

It is preferred that the first and / or the second clamping screw is each formed by a threaded pin having a conical end face, wherein the threaded pin is screwed into an associated internal thread on the headband. The setscrews can be placed completely sunk in relation to the outer surface of the retaining clip in this. The conical end face of the grub screw digs particularly easily into the housing or in the retaining strip, so that there is a good fit. Grub screws are particularly cost-effective because they are standard parts. Preferably, a grub screw comes after DIN 914 or after DIN 553 for use.

It is preferred that both legs are screwed to a second clamping screw, wherein the two corresponding end faces of the second clamping screws face each other. The two second clamping screws can be tightened independently of each other so that the retaining strip remains in its desired position on the housing. It is also ensured that a positive connection between the second clamping screws and the housing results on both legs by plastic deformation. The second clamping screws are preferably arranged on a common central axis, which runs perpendicular to the longitudinal direction.

It is preferred that the base has a recess open towards the housing, in which the retaining strip is received. This results in a headband, which is very stable, while he claimed little space. Through the recess also finds a coarse direction of the retaining strip relative to the headband instead, so that the end face of the first clamping screw rests at the designated location on the headband. The recess is preferably rectangular in cross-section.

It is preferred that the depth of the recess is greater than the height of the retaining strip. Thus, the base of the retaining clip can be applied to the housing, which simplifies the mounting of the retaining clip. At the same time it is ensured that the retaining strip is pressed by the first clamping screw against the housing and not from the headband.

It is preferred that the end face of the first clamping screw protrudes from the retaining bracket at the base of the recess. This results in a particularly festet clamping the retaining strip.

It is preferred that the retaining strip has two parallel undercut grooves, which are delimited by a common divider, wherein the end face of the first clamping screw rests against a free end of the divider. In the two parallel, undercut grooves, two separate sensors can be accommodated, which are arranged with respect to the longitudinal direction with a small distance from each other. Thus, closely adjacent positions of the linear motion device can be detected. The proposed clamping on the divider causes a central force in the retaining strip, so that it rests against the entire surface of the housing.

It is preferred that the retaining strip has an alignment projection, which is arranged so that it can engage in a matched alignment groove on the housing. This is intended to align the retaining strip transversely to the longitudinal direction positively against the housing. The alignment projection is preferably arranged with respect to the first clamping screw on the opposite side of the retaining strip.

It is preferred that the alignment projection is triangular in cross section. As a result, a play-free engagement of the holding projection is achieved in the alignment. The retaining strip with the Ausrichtvorsprung is preferably formed mirror-symmetrically. The tip of the Ausrichtvorsprungs is thus in the center of symmetry and is located at most far out on the retaining strip, so that it first engages in the alignment.

It is preferred that the width of the recess is greater than the width of the retaining strip. This ensures that the retaining strip is aligned solely by the Ausrichtvorsprung, where it is not pressed by the headband away from the desired position on the housing.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination indicated, but also in other combinations or in isolation, without departing from the scope of the present invention.

The invention will be explained in more detail below with reference to the accompanying drawings. It shows:

1 a perspective view of a linear motion device with a holding device according to the invention; and

2 a cross section of the linear motion device after 1 ,

1 shows a perspective view of a linear motion device 10 with a holding device according to the invention 30 , The linear motion device 10 is essentially in accordance with the DE 10 2007 043 391 A1 whose entire content is referred to and incorporated in the present application. The linear motion device 10 is exemplified as an electric cylinder. However, the present invention is applicable to any linear motion device in which a runner or a boom 17 with respect to a longitudinal direction 11 movable with respect to a housing 12 is.

The linear motion device 10 has a housing 12 , which has a constant outer cross-sectional shape in the longitudinal direction 11 extends. Said outer cross-sectional shape is present square formed with rounded corners. This shape of the outer surface 13 was chosen so that the linear motion device 11 can be easily cleaned. Therefore also on from the DE 10 2007 043 391 A1 known undercut grooves directly on the housing 12 waived. These can be retrofitted with the holding device according to the invention.

The housing 12 has a main body 18 made of extruded aluminum. It therefore extends with a constant cross-sectional shape in the longitudinal direction 11 , At the in 1 left end of the main body 18 is a first endblock 19 attached, in particular screwed. The first endblock 19 forms a linear sliding bearing for the boom 17 coming out of the case 12 protruding, taking in the longitudinal direction 11 is mobile. The boom 17 is in the form of a circular cylindrical tube, wherein at its free end a fastening means in the form of a threaded pin is provided.

On the opposite, in 1 right end of the main body 18 is a second endblock 20 fixed, which a pivot bearing for a threaded spindle (no. 14 in 2 ), so that these with respect to the axis of rotation 11a is rotatable. The rotation axis 11a runs parallel to the longitudinal direction 11 , The threaded spindle protrudes with a drive pin 21 out of the case 12 out, which can be brought, for example with an electric motor in rotary drive connection.

At the in 1 upper side of the main body 18 is the holding device 30 with the retaining strip 50 and the two brackets 70 arranged. The one-piece retaining strip 50 is designed as a separate component, which is made of aluminum in the extrusion process. The retaining strip 50 extends with a constant cross-sectional shape in the longitudinal direction 11 , In this case, they have the same length as the main body 18 having. But it is also conceivable, the retaining strip 50 shorter than the main body 18 perform. The retaining strip 50 has two undercut grooves 51 , wherein in a groove, a sensor 31 is recorded, which is clamped there. Corresponding sensors are on page 30 of the catalog "Electromechanical Cylinders EMC", which was published on 11.06.2014 under the Internet address https://www13.boschrexroth-us.com/catalogs/R310A_3306-EMC_2012-02-L.pdf was available.

The two brackets 70 are identical. They are made of aluminum, where they are made, for example, starting from an extruded profile by sawing short pieces. You therefore have in the longitudinal direction 11 in the 2 illustrated, constant cross-sectional shape. The two opposite longitudinal end faces of the headband 70 are flat, being perpendicular to the longitudinal direction 11 run. The two ends of the retaining strip 50 is present in each case a separate headband 70 assigned, with a small distance to the associated end of the retaining strip 50 is arranged. The headband invention 70 however, in any number at any point along the longitudinal direction 11 be arranged. It is understood that only so many headband 70 be used as for a sufficiently secure attachment of the retaining strip 50 on the housing 12 necessary. The first and the second clamping screw 32 ; 34 are with respect to the longitudinal direction 11 each in the middle of the associated retaining bracket 70 arranged.

2 shows a cross section of the linear motion device 10 to 1 wherein the sectional plane through the screw axes of the first and the second clamping screw 32 ; 34 a retaining clip 70 runs. The headband 70 is U-shaped. He has a base 71 from the two thighs 72 stand up vertically. In the middle of the base 71 is a rectangular recess 74 arranged in which the retaining strip 50 is included. The width 75 the recess 74 is slightly larger than the width of the retaining strip 50 , Accordingly, the retaining strip 50 solely from its triangular Ausrichtvorsprung 55 aligned, in a play-free alignment groove in the housing 12 intervenes.

The depth 76 the recess 74 is greater than the height of the retaining strip 50 executed. Consequently, the reason lies 77 the recess 74 even then not on the retaining strip 50 if the base 71 with its flat inner surface on the housing 12 is applied.

The retaining strip 50 has a bottom wall 54 , which is formed in the form of a flat plate with a constant thickness. From the bottom wall 54 stand two side bars 53 and a divider 52 vertically off. The divider 52 is in the center of symmetry of the retaining strip 50 arranged, with the side bars 53 each at the outermost edge of the retaining strip 50 are arranged. A side bar 53 forms together with the divider 52 an undercut groove 51 in which a sensor 31 can be included. At the free ends of the side bars 53 and the divider 52 For this purpose, protrusions pointing towards the groove center are provided, which come from the sensor 31 can be engaged behind, so that it can be clamped. The outer outline of the retaining strip 50 is with the exception of the Ausrichtvorsprungs 55 rectangular.

In a run with the divider 52 becomes the base 71 from an internal thread 73 interspersed, in which the first clamping screw 32 is screwed. The first clamping screw is in the form of a threaded pin 36 with tip and hexagon socket after DIN 914 educated. The face 33 the first clamping screw 32 , which at the divider 52 is present, is formed in the form of a circular cone, so that they are the retaining strip 50 plastically deformed at a sufficiently large clamping force.

At the free ends of the thighs 72 is in each case a second clamping screw 34 screwed. The thigh 72 are for this by an internal thread 73 interspersed. The second clamping screws 34 are also as a threaded pin 36 with tip and hexagon socket after DIN 914 educated. The face 35 the second clamping screws 34 , which rest against the housing, is therefore also formed in a circular cone shape. The central axes of the second clamping screws 34 lie on a common axis, which runs parallel to the base.

Inside the case 12 is a threaded spindle 14 arranged, which in screw engagement with a threaded nut 15 stands, which the threaded spindle 14 sleeve-like surrounds. In the threaded nut 15 it is preferably a ball screw nut. The threaded nut 15 is at the housing-side end of the tubular arm (no. 17 in 1 ) attached. To twist the nut 15 to prevent relative to the housing is a rotation 16 provided, which wear strips on the threaded nut and adapted grooves on the housing 12 having.

LIST OF REFERENCE NUMBERS

10

Linear motion device

11

longitudinal direction

11a

longitudinal axis

12

casing

13

Outside surface of the housing

14

screw

15

threaded nut

16

twist

17

boom

18

main body

19

first endblock

20

second endblock

21

Drive pin of the threaded spindle

30

holder

31

sensor

32

first clamping screw

33

Face of the first clamping screw

34

second clamping screw

35

End face of the second clamping screw

36

Set screw

50

retaining strip

51

undercut groove

52

divider

53

side web

54

bottom wall

55

orienting

70

headband

71

Base

72

leg

73

inner thread

74

recess

75

Width of the recess

76

Depth of the recess

77

Reason of the recess

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• DE 102007043391 A1 [0020, 0021]

Cited non-patent literature

• http://www.festo.com/cms/en-ch_ch/21479.htm [0002]
• DIN 914 [0007]
• DIN 553 [0007]
• https://www13.boschrexroth-us.com/catalogs/R310A_3306-EMC_2012-02-L.pdf [0024]
• DIN 914 [0029]
• DIN 914 [0030]

Claims (11)

Holding device ( 30 ) for mounting a sensor ( 31 ) on a housing ( 12 ) a linear motion device ( 10 ), whereby the housing ( 12 ) having a constant outer cross-sectional shape in a longitudinal direction ( 11 ), wherein the holding device ( 30 ) a separate retaining strip ( 50 ) with at least one undercut groove ( 51 ), wherein the retaining strip ( 50 ) with a constant cross-sectional shape in the longitudinal direction ( 11 ), characterized in that the holding device ( 30 ) at least one separate headband ( 70 ), wherein the headband ( 70 ) One Base ( 71 ), which extend transversely to the longitudinal direction ( 11 ), wherein the base with a first clamping screw ( 32 ) is screwed, the end face ( 33 ) on the retaining strip ( 50 ) is applied, wherein the at least one headband ( 70 ) two legs ( 72 ), which perpendicular to the base ( 71 ) protrude so that they the housing ( 12 ), wherein at least one leg ( 72 ) with a second clamping screw ( 34 ) is screwed, the end face ( 35 ) on the outside of the housing ( 12 ), so that the housing ( 12 ) between the two legs ( 72 ) can be clamped. Holding device according to claim 1, wherein two or more identical retaining clips ( 70 ) are provided, which of the same retaining strip ( 50 ) assigned. Holding device according to one of the preceding claims, wherein the first and / or the second clamping screw ( 32 ; 34 ) is each formed by a threaded pin having a conical end face ( 33 ; 35 ), wherein the threaded pin ( 36 ) in an associated internal thread ( 73 ) on the mounting bracket ( 70 ) is screwed. Holding device according to one of the preceding claims, wherein both legs ( 72 ) with a second clamping screw ( 34 ) are screwed, wherein the two corresponding end faces ( 35 ) of the second clamping screws ( 34 ) face each other. Holding device according to one of the preceding claims, wherein the base ( 71 ) one to the housing ( 12 ) open recess ( 74 ), in which the retaining strip ( 50 ) is recorded. Holding device according to claim 5, wherein the depth ( 76 ) of the recess ( 74 ) greater than the height of the retaining strip ( 50 ). Holding device according to claim 5 or 6, wherein the end face ( 33 ) of the first clamping screw ( 32 ) at the bottom ( 77 ) of the recess ( 74 ) from the headband ( 70 ) stands out. Holding device according to one of the preceding claims, wherein the retaining strip ( 50 ) two parallel undercut ( 51 ) Has grooves, which through a common divider ( 52 ), the end face ( 33 ) of the first clamping screw ( 32 ) at a free end of the separating web ( 52 ) is present. Holding device according to one of the preceding claims, wherein the retaining strip ( 50 ) an alignment projection ( 55 ) which is arranged so that it in a matched alignment groove on the housing ( 12 ) can intervene. Holding device according to claim 9, wherein the alignment projection ( 55 ) is triangular in cross-section. A holding device according to claim 9 or 10, when dependent on claim 5, wherein the width ( 75 ) of the recess ( 74 ) greater than the width of the retaining strip ( 50 ).

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