CA1093620A - Load-controlled switching device for motor vehicle step - Google Patents
Load-controlled switching device for motor vehicle stepInfo
- Publication number
- CA1093620A CA1093620A CA264,190A CA264190A CA1093620A CA 1093620 A CA1093620 A CA 1093620A CA 264190 A CA264190 A CA 264190A CA 1093620 A CA1093620 A CA 1093620A
- Authority
- CA
- Canada
- Prior art keywords
- members
- sleeve
- switch
- actuator
- abutments
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01G—WEIGHING
- G01G3/00—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances
- G01G3/02—Weighing apparatus characterised by the use of elastically-deformable members, e.g. spring balances wherein the weighing element is in the form of a helical spring
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Transmission Devices (AREA)
- Power-Operated Mechanisms For Wings (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
Abstract
ABSTRACT OF THE DISCLOSURE
A load-controlled switching device mountable in a motor vehicle step has an outer hollow member which is mounted on the step and displaceable therewith and an inner hollow member which is mounted on the motor-vehicle frame and displaceable therewith.
The members define a closed chamber and are relatively telescop-able between an unloaded position relatively far apart and a load-ed position relatively close together. An internal collar on the outer member and an external collar on the inner member are opera-tively engageable through a slide ring to form a first set of abut-ments which defines the unloaded position. A second set of abut-ments is engageable through an elastomeric ring and is formed by end surfaces on the two members so as to define the loaded posi-tion. A spring between the two members normally urges them apart.
A switch is carried on one of the members and an actuator on the other member so that as the two members move together the switch is opened or closed.
A load-controlled switching device mountable in a motor vehicle step has an outer hollow member which is mounted on the step and displaceable therewith and an inner hollow member which is mounted on the motor-vehicle frame and displaceable therewith.
The members define a closed chamber and are relatively telescop-able between an unloaded position relatively far apart and a load-ed position relatively close together. An internal collar on the outer member and an external collar on the inner member are opera-tively engageable through a slide ring to form a first set of abut-ments which defines the unloaded position. A second set of abut-ments is engageable through an elastomeric ring and is formed by end surfaces on the two members so as to define the loaded posi-tion. A spring between the two members normally urges them apart.
A switch is carried on one of the members and an actuator on the other member so that as the two members move together the switch is opened or closed.
Description
1093~Zl) rhe l)rcs(n~ invcntion -rel~tes to a load-control switch-;n(~ device. More particularly this invention concerns such a swi1(h llsable in a step for a motor vehicle for controlling an cle(tr;cal circuit in dependcnce upon lowering of the step.
This type of arrangernent is used in order to prevent opening of the motor vehicle doors, ope-^atjon of -~he motor vehicle, or withdrawal of ~he step when same is loaded.
This ~ype of switching d~vice normally comprises a first support and an e]ement displaceable relative to this support when loaded. Normally, ~his element is a portion of the step and the support is a fixed part of the step or the motor-vehicle body. A spr;ng urges the two members apart and a switch is connected between them so as to close or open, depending on the type of circuit being controlled, when the one part is moved toward the other against the force of the spring. The spring serves to return the elements to the unloaded position once the load is removed and to prevent the weight of the one element from actuating the switch all by itself. The spring can often be adjusted so as to establish a threshold weight or lead that is the minimum value necessary to actuate the switch.
Finally, various abutments are usually provided so as to prevent the two elements from moving apart beyond a predeter-mined spacing, and to define a loaded position for the two ele-ments relative to each other. Such abutments are frequently constituted as angle pieces connected to the various elements and gripping behind each other.
The principal disadvantage of this sytem is that there are several parts which must be all assembled together at various locations so that the overall cost is elevated. Furthermore, the ~ y - 2 -lV~6ZV
1 switch and abutments are frequently liable to fouling due to the mounting of such a step underneath the motor-vehicle chassis.
It is therefore an object of the present invention to pxovide an improved load-control switching device.
Another object is to provide an improved load switch usable in a motor-vehicle step.
Yet another object is to provide such a switching device which is extremely simple, yet which has a long service life.
A further object is to provide an improved load-operat-ing switch which can simply and easily be adjusted so as to varythe load-weight threshold, as well as the loaded and unloaded posi-tions of the pair of supports between which the switch is connect-ed.
These objects are attained according to the present in-vention in a load-controlled switching device which is connectable between a pair of supports displaceable toward each other and which has an outer hollow member mounted on one of the supports for displacement therewith and an inner hollow member which is mounted on the other support and displaceable therewith. These members define a closed chamber and are telescopable between an unloaded position with the supports relatively far apart and a loaded position with the supports relatively close together.
Means is provided including a first set of abutments on the members which are operatively engageable in the unloaded position to prevent the members from telescoping apart beyond this unloaded position, and means is provided including a second set of abut-ments on the members operatively engageable in the loaded position for preventing these members from telescoping together beyond the loaded position. A spring in the chamber is braced between the members and urges them into the unloaded position. A switch is ~t~36~, 1 carried on one of the members in the chamber and an actuator is carried on the other of the members and is juxtaposable with the switch to operate it.
According to further features of this invention the out-er hollow member is a tube having at one end an outwardly directly directed flange which is secured to one of the supports and on its other end an inwardly projecting collar that cooperates with an outwardly projecting collar on the inner member and forms there-with the first set of abutments. In this arrangement the inner member is of U-section.
Between the two telescoping members there is provided a synthetic-resin relatively noncompressible sleeve having an outer surface sliding along the inner surface of the o~ter tube and an inner surface sliding on the outer surface of the inner member, One end of this sleeve is axially engageable against one of the collars and the other end against the other collar so as operative-ly to interconnect them and to define the unloaded position.
According to yet another feature of this invention the inner member is threaded into a ring secured to the other support and can be axially screwed within this ring for adjustment of the unloaded position of the arrangemen , One surface of this ring which forms part of the inner member has an end face operatively engageable with an end surface on the outer member, these two end surfaces constituting the second set of abutments. In order to adjust the loaded position the outer member itself is threaded within a ring secured to the one support so that axially screw~ng of this outer member allows adjustment of the loaded position.
In order to obtain a relatively noise-free and smooth operation of the device there is provided in accordance with yet another feature of this invention an elastomeric bumper ring be-~362~
1 tween the above-mentioned end surfaces, This bumper ring there-fore cushions the two members relative to each other and greatly increases the service life of the switching device.
In order to adjust the force needed to actuate this arrangement the spring is braced at one end against one of the hollow members and at the other end against a support plate carried in turn on one end of an internally and externally threaded sleeve passing through the other member, The sleeve can, therefore, be screwed in or out to adjust the stressing in the spring. Further-more, the actuator may constitute a screw threaded through thecenter of this sleeve so that screwing of this actuator in and out will determine the point at which the switch carried on the other member will be actuated. If the threads on the inside and outside of the spring-adjusting sleeve are of the same pitch it is possible to arrest the screw and adjust the spring without changing the setting of the actuator.
According to further features of this invention the screw itself is formed with a longitudinally through-going hole so that a probe or test pin can be passed axially through this screw in order to operate the switch and test the arrangement.
A cuff has one end connected to one member and another end connect-ed to the other member so as completely to enclose all of the abut-ments and the internal mechanism of the switch. Thus an extremely long service life can be obtained.
With the switch according to the present invention all of the various parts are housed in an out-of-the-way manner that ensures that they will not be exposed to potentially damaging con-ditions. Furthermore, all of the various positions and parts of the arrangement can be adjusted relatively easily without dis-assembly of the arrangement. In addition, the switch device initself can constitute the guide and support for the movable part ~93~Z() 1 of a motor-vehicle step on the motor-vehicle frame, as the tele-scoping arrangement ensures both good lateral and axial guiding of the movable element.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construc-tion and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of a specific embodiment when read in connection with the accompanying drawing.
The sole Figure of the drawing shows in axial section a switching device according to the present invention.
As shown in the drawing a switching device according to -~
this invention basically comprises an outer hollow body 1 secured to a step plate 11, an inner hollow body 2 secured to a body part 12, and a spring 3 urging them apart. An actuator 4 is carried on the inner part 2 and serves to operate a proximity switch 5 carried on the part 1.
The part 1 is formed of an outer tube la having a flange lb secured to the plate 11 and formed at its lower end with an in-wardly projecting collar lc. In addition the outer member 1 com-prises a plug ld threaded into the tube la and in turn carrying the switch 5 which may be of the reed type. The spring 3 bears at one end on the annular plug ld which is formed with axially ex-tending holes allowing a wrench to be fitted to it, The element 2 is of U-section and comprises a ring 2b having a flange 2c screwed to the plate 12, Threaded within this ring 2b like the plug ld is a tube 2e coaxial with the tube la and having an upper end formed with an outwardly projecting collar 2a.
1(~ C~
1 Tlle collar~ 2a and lc together form a set 7 of abutments t~
between which is erlg-ged a Teflon ring ~ whose inner surface is slidable Oll the sleeve 2a, whose outer surface is slidable in the sleeve la, and whose ends engage the collars 2a and lc. Thus this ring 8 which is relatively incompressible defines a force-transmit-ting member between the set 7 of abutments. Since the spring 3 urges the members 1 and 2 apart the unloaded rest position of this assembly is therefore established by this set 7.
The upper end 2d of the ring 2b of the member 2 is opera-tively engageable with the lower end surface le of the element la.These two surfaces 2d and le lie in respective planes perpendicular to the axis of the device and constitute a set 6 of abutments that define the loaded position of the arrangement. An elastomeric square-section ring 9 rests on the surface 2d and surrounds the tube 2e so that when the elements 11 and 12 are moved rapidly toward each other the surfaces le and 2e will not strike noisily together but will be cushioned by means of this elastomeric ring 9.
The actuator 4 comprises an internally and externally threaded sleeve 4a screwed into the central hole in the sleeve 2e and having an upper end carrying a washer or disk 4c on which bears the lower end of the spring 3. Thus, it is possible to adjust the compression force in the spring 3 by screwing the sleeve 4a into and out of the sleeve 2e which may be held nonrotatably by means of appropriate countersunk formations in its exposed end. Threaded within the sleeve 4a is a screw 4b constituting the actuator for the proximity switch 5 whose leads extend upwardly out through the plate 11. The proximity switch 5 is of the type shown, for example, lV936ZO
in the catalogue "Wechselspannungs, Pulsoren, Zylinder-Bauform, Quader-Bauform'70f P~,SO7I7RONIC, Federal Republic of Germany. ~he switch has at its end opposite to the lead, an electromagnetic field. When in normal operation a metallic body is introduced into the magnetic field, particularly the screw 4b, the switching process starts. In addition the screw 4b has an axially throughgoing hole 4d which allows a probe or pin to be pushed through this screw to actuate the switch 5 to test this switch. The inter-nal and external threads on the sleeve 4a are identical . . .
:
- 7a -10~3~
1 so that it is possible to grip and arrest the screw 4b while rotating the screw 4a in order to adjust the compression of the spring 3 independently of the position of the screw 4b.
A flexible cuff 10 has one end secured to the member 1 at the outside surface of the tube la and another end secured to the outside surface of the ring 2b. This cuff 10 therefore prevents any dust or foreign bodies from entering into the arrange-ment, but permits a relative axial motion of the various parts with these.
With the switching device according to the present in-vention it is therefore possible to adjust the actuation position for the switch 5 by screwing the actuator 4b in the-sleeve 4a.
Similarly both the actuation position and the compression of the spring 3 can be adjusted by screwing the plug ld in the tube la, or the spring compression can be adjusted independently of the actuation position by rotating the sleeve 4a-while holding the sleeve 4b from rotation. The illustrated unloaded position of the device can be adjusted by screwing the sleeve 2e in the ring 2b.
Thus the switch according to the present invention is completely closed so that it will have a long trouble-free service life. At the same time it can readily be adjusted from one end and any of its parts can easily be withdrawn and replaced if de-sired.
It is possible to simplify construction by forming the two elements la and ld as a single piece. To do this, therefore, it will be necessary to tooth the collarc 2a and lc in order to allow them to be fitted together bayonet-fashion.
It will be understood that each of the elements describ-ed above, or two or more together, may also find a useful appli-~3~;ZIV
1 cation in other types of structure differing from the types described above.
While the invention has been illustrated and described as embodied in a switching device, it is not intended to be limit-ed to the details shown, since various modifications and structur-al changes may be made without departing in any way from the spirit of the present invention.
: 30
This type of arrangernent is used in order to prevent opening of the motor vehicle doors, ope-^atjon of -~he motor vehicle, or withdrawal of ~he step when same is loaded.
This ~ype of switching d~vice normally comprises a first support and an e]ement displaceable relative to this support when loaded. Normally, ~his element is a portion of the step and the support is a fixed part of the step or the motor-vehicle body. A spr;ng urges the two members apart and a switch is connected between them so as to close or open, depending on the type of circuit being controlled, when the one part is moved toward the other against the force of the spring. The spring serves to return the elements to the unloaded position once the load is removed and to prevent the weight of the one element from actuating the switch all by itself. The spring can often be adjusted so as to establish a threshold weight or lead that is the minimum value necessary to actuate the switch.
Finally, various abutments are usually provided so as to prevent the two elements from moving apart beyond a predeter-mined spacing, and to define a loaded position for the two ele-ments relative to each other. Such abutments are frequently constituted as angle pieces connected to the various elements and gripping behind each other.
The principal disadvantage of this sytem is that there are several parts which must be all assembled together at various locations so that the overall cost is elevated. Furthermore, the ~ y - 2 -lV~6ZV
1 switch and abutments are frequently liable to fouling due to the mounting of such a step underneath the motor-vehicle chassis.
It is therefore an object of the present invention to pxovide an improved load-control switching device.
Another object is to provide an improved load switch usable in a motor-vehicle step.
Yet another object is to provide such a switching device which is extremely simple, yet which has a long service life.
A further object is to provide an improved load-operat-ing switch which can simply and easily be adjusted so as to varythe load-weight threshold, as well as the loaded and unloaded posi-tions of the pair of supports between which the switch is connect-ed.
These objects are attained according to the present in-vention in a load-controlled switching device which is connectable between a pair of supports displaceable toward each other and which has an outer hollow member mounted on one of the supports for displacement therewith and an inner hollow member which is mounted on the other support and displaceable therewith. These members define a closed chamber and are telescopable between an unloaded position with the supports relatively far apart and a loaded position with the supports relatively close together.
Means is provided including a first set of abutments on the members which are operatively engageable in the unloaded position to prevent the members from telescoping apart beyond this unloaded position, and means is provided including a second set of abut-ments on the members operatively engageable in the loaded position for preventing these members from telescoping together beyond the loaded position. A spring in the chamber is braced between the members and urges them into the unloaded position. A switch is ~t~36~, 1 carried on one of the members in the chamber and an actuator is carried on the other of the members and is juxtaposable with the switch to operate it.
According to further features of this invention the out-er hollow member is a tube having at one end an outwardly directly directed flange which is secured to one of the supports and on its other end an inwardly projecting collar that cooperates with an outwardly projecting collar on the inner member and forms there-with the first set of abutments. In this arrangement the inner member is of U-section.
Between the two telescoping members there is provided a synthetic-resin relatively noncompressible sleeve having an outer surface sliding along the inner surface of the o~ter tube and an inner surface sliding on the outer surface of the inner member, One end of this sleeve is axially engageable against one of the collars and the other end against the other collar so as operative-ly to interconnect them and to define the unloaded position.
According to yet another feature of this invention the inner member is threaded into a ring secured to the other support and can be axially screwed within this ring for adjustment of the unloaded position of the arrangemen , One surface of this ring which forms part of the inner member has an end face operatively engageable with an end surface on the outer member, these two end surfaces constituting the second set of abutments. In order to adjust the loaded position the outer member itself is threaded within a ring secured to the one support so that axially screw~ng of this outer member allows adjustment of the loaded position.
In order to obtain a relatively noise-free and smooth operation of the device there is provided in accordance with yet another feature of this invention an elastomeric bumper ring be-~362~
1 tween the above-mentioned end surfaces, This bumper ring there-fore cushions the two members relative to each other and greatly increases the service life of the switching device.
In order to adjust the force needed to actuate this arrangement the spring is braced at one end against one of the hollow members and at the other end against a support plate carried in turn on one end of an internally and externally threaded sleeve passing through the other member, The sleeve can, therefore, be screwed in or out to adjust the stressing in the spring. Further-more, the actuator may constitute a screw threaded through thecenter of this sleeve so that screwing of this actuator in and out will determine the point at which the switch carried on the other member will be actuated. If the threads on the inside and outside of the spring-adjusting sleeve are of the same pitch it is possible to arrest the screw and adjust the spring without changing the setting of the actuator.
According to further features of this invention the screw itself is formed with a longitudinally through-going hole so that a probe or test pin can be passed axially through this screw in order to operate the switch and test the arrangement.
A cuff has one end connected to one member and another end connect-ed to the other member so as completely to enclose all of the abut-ments and the internal mechanism of the switch. Thus an extremely long service life can be obtained.
With the switch according to the present invention all of the various parts are housed in an out-of-the-way manner that ensures that they will not be exposed to potentially damaging con-ditions. Furthermore, all of the various positions and parts of the arrangement can be adjusted relatively easily without dis-assembly of the arrangement. In addition, the switch device initself can constitute the guide and support for the movable part ~93~Z() 1 of a motor-vehicle step on the motor-vehicle frame, as the tele-scoping arrangement ensures both good lateral and axial guiding of the movable element.
The novel features which are considered as characteristic for the invention are set forth in particular in the appended claims. The invention itself, however, both as to its construc-tion and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of a specific embodiment when read in connection with the accompanying drawing.
The sole Figure of the drawing shows in axial section a switching device according to the present invention.
As shown in the drawing a switching device according to -~
this invention basically comprises an outer hollow body 1 secured to a step plate 11, an inner hollow body 2 secured to a body part 12, and a spring 3 urging them apart. An actuator 4 is carried on the inner part 2 and serves to operate a proximity switch 5 carried on the part 1.
The part 1 is formed of an outer tube la having a flange lb secured to the plate 11 and formed at its lower end with an in-wardly projecting collar lc. In addition the outer member 1 com-prises a plug ld threaded into the tube la and in turn carrying the switch 5 which may be of the reed type. The spring 3 bears at one end on the annular plug ld which is formed with axially ex-tending holes allowing a wrench to be fitted to it, The element 2 is of U-section and comprises a ring 2b having a flange 2c screwed to the plate 12, Threaded within this ring 2b like the plug ld is a tube 2e coaxial with the tube la and having an upper end formed with an outwardly projecting collar 2a.
1(~ C~
1 Tlle collar~ 2a and lc together form a set 7 of abutments t~
between which is erlg-ged a Teflon ring ~ whose inner surface is slidable Oll the sleeve 2a, whose outer surface is slidable in the sleeve la, and whose ends engage the collars 2a and lc. Thus this ring 8 which is relatively incompressible defines a force-transmit-ting member between the set 7 of abutments. Since the spring 3 urges the members 1 and 2 apart the unloaded rest position of this assembly is therefore established by this set 7.
The upper end 2d of the ring 2b of the member 2 is opera-tively engageable with the lower end surface le of the element la.These two surfaces 2d and le lie in respective planes perpendicular to the axis of the device and constitute a set 6 of abutments that define the loaded position of the arrangement. An elastomeric square-section ring 9 rests on the surface 2d and surrounds the tube 2e so that when the elements 11 and 12 are moved rapidly toward each other the surfaces le and 2e will not strike noisily together but will be cushioned by means of this elastomeric ring 9.
The actuator 4 comprises an internally and externally threaded sleeve 4a screwed into the central hole in the sleeve 2e and having an upper end carrying a washer or disk 4c on which bears the lower end of the spring 3. Thus, it is possible to adjust the compression force in the spring 3 by screwing the sleeve 4a into and out of the sleeve 2e which may be held nonrotatably by means of appropriate countersunk formations in its exposed end. Threaded within the sleeve 4a is a screw 4b constituting the actuator for the proximity switch 5 whose leads extend upwardly out through the plate 11. The proximity switch 5 is of the type shown, for example, lV936ZO
in the catalogue "Wechselspannungs, Pulsoren, Zylinder-Bauform, Quader-Bauform'70f P~,SO7I7RONIC, Federal Republic of Germany. ~he switch has at its end opposite to the lead, an electromagnetic field. When in normal operation a metallic body is introduced into the magnetic field, particularly the screw 4b, the switching process starts. In addition the screw 4b has an axially throughgoing hole 4d which allows a probe or pin to be pushed through this screw to actuate the switch 5 to test this switch. The inter-nal and external threads on the sleeve 4a are identical . . .
:
- 7a -10~3~
1 so that it is possible to grip and arrest the screw 4b while rotating the screw 4a in order to adjust the compression of the spring 3 independently of the position of the screw 4b.
A flexible cuff 10 has one end secured to the member 1 at the outside surface of the tube la and another end secured to the outside surface of the ring 2b. This cuff 10 therefore prevents any dust or foreign bodies from entering into the arrange-ment, but permits a relative axial motion of the various parts with these.
With the switching device according to the present in-vention it is therefore possible to adjust the actuation position for the switch 5 by screwing the actuator 4b in the-sleeve 4a.
Similarly both the actuation position and the compression of the spring 3 can be adjusted by screwing the plug ld in the tube la, or the spring compression can be adjusted independently of the actuation position by rotating the sleeve 4a-while holding the sleeve 4b from rotation. The illustrated unloaded position of the device can be adjusted by screwing the sleeve 2e in the ring 2b.
Thus the switch according to the present invention is completely closed so that it will have a long trouble-free service life. At the same time it can readily be adjusted from one end and any of its parts can easily be withdrawn and replaced if de-sired.
It is possible to simplify construction by forming the two elements la and ld as a single piece. To do this, therefore, it will be necessary to tooth the collarc 2a and lc in order to allow them to be fitted together bayonet-fashion.
It will be understood that each of the elements describ-ed above, or two or more together, may also find a useful appli-~3~;ZIV
1 cation in other types of structure differing from the types described above.
While the invention has been illustrated and described as embodied in a switching device, it is not intended to be limit-ed to the details shown, since various modifications and structur-al changes may be made without departing in any way from the spirit of the present invention.
: 30
Claims (9)
1. A load-controlled switching device connectable be-tween a pair of supports displaceable toward each other, said de-vice comprising: an outer hollow member mountable on one of said supports and displaceable therewith; an inner hollow member mount-able on the other of said supports and displaceable therewith, said member defining a closed chamber and being telescopable be-tween an unloaded position with said supports relatively far apart and a loaded position with said supports relatively close together;
means including a first set of abutments on said members engage-able in said unloaded position for preventing said members from telescoping apart beyond said unloaded position, said first set of abutments including an outwardly projecting collar formed on said inner member and an inwardly projecting collar formed on said outer member; means including a second set of abutments on said members engageable in said loaded position for preventing said members from telescoping together beyond said loaded position; a spring in said chamber braced between and urging said members into said unloaded position; a switch carried on one of said members in said chamber;
and an actuator on the other of said members and juxtaposable with said switch to operate same.
means including a first set of abutments on said members engage-able in said unloaded position for preventing said members from telescoping apart beyond said unloaded position, said first set of abutments including an outwardly projecting collar formed on said inner member and an inwardly projecting collar formed on said outer member; means including a second set of abutments on said members engageable in said loaded position for preventing said members from telescoping together beyond said loaded position; a spring in said chamber braced between and urging said members into said unloaded position; a switch carried on one of said members in said chamber;
and an actuator on the other of said members and juxtaposable with said switch to operate same.
2. The device defined in claim 1, further comprising a sleeve having an outer surface engaging and slidable on said outer member, an inner surface engaging and slidable on said inner member, one end engageable with one of said collars, and another end en-gageable with the other of said collars, said ends engaging said collars in said unloaded position for force transmission therebe-tween through said sleeve.
3. The device defined in claim 2 wherein said sleeve is ?f synthetic-resin material with low elasticity and a low co-efficient of friction
4. The device claimed in claim 1 wherein said second set of abutments includes an end surface on said outer member turn-ed toward said inner member and an end surface on said inner member turned toward said outer member, said end surfaces being operative-ly engageable in said loaded position.
5. The device defined in claim 4, further comprising a body of elastic material on one of said end surfaces engageable in said loaded position with the other end surface.
6. The device defined in claim 5 wherein said body is a ring surrounding said inner member and seated on said end sur-face thereof.
7. The device defined in claim 1 wherein said other member is provided with an internally and externally threaded sleeve having an end bearing on said spring, said actuator being threaded inside said sleeve, whereby screwing of said sleeve in said member changes the compression or said spring and screwing of said actuator in said sleeve displaces said actuator relative to said switch.
8. The device defined in claim 1 wherein said actuator is formed with a throughgoing passage, whereby a test probe can be engaged through said passage with said switch.
9. The device defined in claim 1, further comprising a dust cuff having one end secured to said outer member and another end secured to said inner member, said abutments being enclosed within said cuff.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP2547959.8 | 1975-10-27 | ||
| DE19752547959 DE2547959C3 (en) | 1975-10-27 | 1975-10-27 | Load-dependent switching device, in particular for securing movable steps on vehicles for passenger transport |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1093620A true CA1093620A (en) | 1981-01-13 |
Family
ID=5960153
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA264,190A Expired CA1093620A (en) | 1975-10-27 | 1976-10-26 | Load-controlled switching device for motor vehicle step |
Country Status (5)
| Country | Link |
|---|---|
| AT (1) | AT348009B (en) |
| CA (1) | CA1093620A (en) |
| DE (1) | DE2547959C3 (en) |
| FR (1) | FR2329990A1 (en) |
| IT (1) | IT1125177B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3242134A1 (en) * | 1982-11-13 | 1984-05-17 | IBEG Maschinen- und Gerätebau GmbH, 4370 Marl | Device for securing movable steps |
| DE3729107A1 (en) * | 1987-09-01 | 1989-03-16 | Siegfried Baatsch | Refuse collection vehicle with reversing safety feature |
| DE10116638B4 (en) * | 2001-04-04 | 2006-04-06 | Zöller-Kipper GmbH | Load monitoring device for running boards |
| DE102006023501B3 (en) * | 2006-05-18 | 2007-10-31 | Zöller-Kipper GmbH | Running board device for vehicle, especially waste collection vehicle, has support arm spring-mounted on vehicle component |
-
1975
- 1975-10-27 DE DE19752547959 patent/DE2547959C3/en not_active Expired
-
1976
- 1976-10-25 IT IT5187076A patent/IT1125177B/en active
- 1976-10-25 AT AT791276A patent/AT348009B/en not_active IP Right Cessation
- 1976-10-26 CA CA264,190A patent/CA1093620A/en not_active Expired
- 1976-10-26 FR FR7633193A patent/FR2329990A1/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| IT1125177B (en) | 1986-05-14 |
| AT348009B (en) | 1979-01-25 |
| DE2547959A1 (en) | 1977-05-12 |
| FR2329990B3 (en) | 1979-07-13 |
| FR2329990A1 (en) | 1977-05-27 |
| ATA791276A (en) | 1978-06-15 |
| DE2547959B2 (en) | 1978-02-09 |
| DE2547959C3 (en) | 1978-10-05 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |