Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H25/00—Switches with compound movement of handle or other operating part
  • H01H25/06—Operating part movable both angularly and rectilinearly, the rectilinear movement being along the axis of angular movement
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H36/00—Switches actuated by change of magnetic field or of electric field, e.g. by change of relative position of magnet and switch, by shielding
  • H01H36/0006—Permanent magnet actuating reed switches
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
  • H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
  • H01H9/02—Bases, casings, or covers
  • H01H9/04—Dustproof, splashproof, drip-proof, waterproof, or flameproof casings

Definitions

• the invention relates to a rotary push switch according to the preamble of claim 1.
• field devices are often used which are used to record process variables.
• a large number of such field devices are manufactured and sold by Endress + Hauser.
• field devices have a display / operating unit which serves to display the measured values and to enter user specifications.
• a display and several operating elements, which are designed as push switches, are provided on the operating unit display.
• rotary pushbuttons are used as controls, which allow easy guidance through a user menu that is shown on the display. By turning the rotary pushbutton, certain menu items are selected, which are then confirmed by pressing the rotary switch.
• the object of the present invention is therefore to provide a rotary pushbutton switch which can be easily installed and sealed in a housing and which can be produced inexpensively.
• the essential idea of the invention is to transmit the rotary movement for actuating the rotary encoder and the lifting movement for actuating the switch via separate transmission elements.
• the rotary push switch according to the invention is considerably easier to seal at its installation location on the housing of a field device.
• the invention also relates to the use of the rotary push switch according to the invention in a field device housing.
• the invention is explained in more detail below on the basis of an exemplary embodiment shown in the drawing. [015]
• the figures show:
• the selected field device 1 is an analysis measuring device e.g. B. a pH sensor.
• the field device 1 has a display / operating unit 3 with a display 5 and four switching elements S1-S4 and a rotary push switch 10 as an operating element.
• the display 5 serves to display measured values; here the pH value of 7.68.
• the rotary pushbutton 10 is shown in more detail.
• the rotary push switch 10 consists essentially of the actuation button 11, which is in direct connection with a rotary encoder 30 and a switch 20.
• the rotary movement of the actuation button 11 is transmitted to the rotary encoder 30 via a hollow shaft 13 as a transmission element.
• a magnetic pin 15 is provided as a separate transmission element for the stroke movement for actuating the switch 20.
• the switch is a magnetic switch such as. B. reed contact, Hall sensor or inductive magnetic sensor.
• the switch 20 and rotary encoder 30 are both arranged on a circuit board (not described in more detail) in the housing of the field device 1.
• the connection between the hollow axis 13 and the rotary encoder 30 takes place via an adapter element 22.
• the rotary push switch 10 is fixed to the housing wall 7 of the field device 1.
• a sealing element 24 is provided between the hollow axis 13 and the housing wall 7.
• a spring element 26, which supports the magnetic pin 15, and a magnet holder 28 are also provided.
• the stroke distance which is possible when the actuation button 11 is pressed is designated by HW and is approximately 2.5 mm.
• the mode of operation of the rotary push switch according to the invention is explained in more detail below.
• the operating button 11 By turning the operating button 11, its rotary movement is opened transmit the encoder 30.
• the encoder 30 is connected to an electronic unit, not shown, which is used to control the display 5.
• the various menu items M1, M2, M3, M4, which are shown on the display 5, can thus be selected via the rotary movement.
• the operating button 11 is moved by the stroke HW.
• the spring force of the spring element 26 must be overcome.
• the magnetic pin 15 approaches the switch 20 a reed contact, which is also connected to the electronic unit, not shown.
• a reed contact as a switch, other magnetic switches such as. B. Hall probes or inductive magnetic pickups possible.
• the sealing element 24, which seals the rotary push switch 10 to the housing wall 7 of the field device 1 is only exposed to the rotary movement of the rotary push switch 10 and not only to the lifting movement. Because of this separation of the different movements, the rotary push switch 10 according to the invention is considerably easier to seal against the housing wall 7.
• the rotary push switch according to the invention is therefore, in addition to protection class IP65 (protected against water jets), also suitable for protection class IP67 (protected against immersion water). It is particularly simple in construction and can be operated safely and reliably even under extreme environmental conditions.

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Citations (2)

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• 2004
  • 2004-01-09 DE DE102004001592A patent/DE102004001592B4/de not_active Expired - Fee Related
  • 2004-12-15 WO PCT/EP2004/053513 patent/WO2005066986A1/de active Application Filing

Patent Citations (2)

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