Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F15—FLUID-PRESSURE ACTUATORS; HYDRAULICS OR PNEUMATICS IN GENERAL
  • F15B—SYSTEMS ACTING BY MEANS OF FLUIDS IN GENERAL; FLUID-PRESSURE ACTUATORS, e.g. SERVOMOTORS; DETAILS OF FLUID-PRESSURE SYSTEMS, NOT OTHERWISE PROVIDED FOR
  • F15B15/00—Fluid-actuated devices for displacing a member from one position to another; Gearing associated therewith
  • F15B15/02—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member
  • F15B15/06—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement
  • F15B15/068—Mechanical layout characterised by the means for converting the movement of the fluid-actuated element into movement of the finally-operated member for mechanically converting rectilinear movement into non- rectilinear movement the motor being of the helical type

Definitions

• the present invention relates to a fluid-driven rotational device having an outgoing turning shaft, mounted in a housing, a plate displaceable in the housing, a motion-translating mechanism between plate and turning shaft and a pressure chamber, at least on one side of the plate, connected to a pressure fluid source.
• a means of the kind described is known, e.g. from DE-OS 1 939 158.
• the motion-translating mechanism in this case comprises a lead screw rigidly adapted on the turning shaft and in mesh with a nut fixed to the plate.
• the pressure chamber is defined and sealed by a metal bellows.
• This rotational device is relatively complicated and is expensive to manufacture. Inparticular, the screw mechanism requires great machining accuracy, which increases production costs.
• the metal bellows is another detail which is impractical and makes manufacture more expensive. Disclosure of Invention
• the object of the invention is simply and cheaply to provide turning motion for pneumatic or hydraulic forces without great demands on machining accuracy, and to avoid the sealing problems occurring in enclosing air or other fluid in metal cylinders having sealed components.
• the motion translating mechanism of the rotational device comprising a pin rigidly attached to the plate and a slot, axially twisted in relation to the shaft, accommodating the pin and extending through the torque shaft.
• the pressure chamber is defined by a bellows.
• a pressure chamber is arranged solely on one side of the plate, while a compression spring is arranged on the other side.
• the rotational means includes a housing comprising two halves 1 and 2. There is a horizontal plate 3 in the housing, this plate being displace able upwards and downwards.
• a turning shaft 6 extends through the plate and is journalled in the halves 1 and 2. In the shaft there is a through slot 5, which is axially twisted in relation the shaft, a pin 4 being accommodated in the slot 5 and rigidly attached to the plate 3.
• the plate 3 is moved upwards and downwards with the aid of two bellows 7 and 8, which can be connected via nipples 13 to a pressurised fluid source, e.g. a compressed air source.
• a pressurised fluid source e.g. a compressed air source.
• the housing halves 1 and 2 are kept together with the aid of through-going, hollow tension members 9 and 10.
• the material in the members is not ferromagnetic.
• the tension members further function as holders and guards for different types of indication means 11.
• one of the hollow members can carry a setable position limit indicator for controlling the motion of the rotational device.
• one of the bellows 7, 8 can be exchanged for any suitable kind of compression spring arranged round the turning shaft.
• the bellows can be made by immersing a block of foamed polymer in a solution of the elastomer of which the bellows is to consist, or by spraying the block with the elastomer in question.
• the block is made to conform with the interior of one half of the housing, and is sufficiently soft and porous for it to remain in the bellows without disadvantageously affecting the ability of the latter to be compressed and to expand.

Landscapes

• Engineering & Computer Science (AREA)
• Physics & Mathematics (AREA)
• Fluid Mechanics (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Actuator (AREA)
• Diaphragms And Bellows (AREA)
• Hydraulic Motors (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=20340065

Family Applications (1)

Country Status (7)

Families Citing this family (1)

Family Cites Families (3)

• 1980
  • 1980-01-25 SE SE8000592A patent/SE428146B/sv not_active IP Right Cessation
• 1981
  • 1981-01-23 BR BR8106186A patent/BR8106186A/pt unknown
  • 1981-01-23 WO PCT/SE1981/000017 patent/WO1981002186A1/en not_active Application Discontinuation
  • 1981-01-23 JP JP56500512A patent/JPS57500163A/ja active Pending
  • 1981-01-23 EP EP81900294A patent/EP0043829A1/en not_active Withdrawn
  • 1981-09-23 NO NO813241A patent/NO813241L/no unknown
  • 1981-09-24 DK DK422481A patent/DK422481A/da not_active Application Discontinuation

Non-Patent Citations (1)

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