Drive cartridge

• US 8,573,082 B2
• Filed: 10/30/2009
• Issued: 11/05/2013
• Est. Priority Date: 10/31/2008
• Status: Active Grant

• Current Assignee: Aliaxis Deutschland GmbH (Aliaxis SA)
• Original Assignee: Friatec AG (Aliaxis SA)
• Inventors: Schwartz, Simon, Jungmann, Georg, Lang, Helko, Schmitt, Harald, Rothermel, Alexander
• Primary Examiner(s): FENSTERMACHER, DAVID MORGAN
• Application Number:
  US12/998,496
• Publication Number:
  US 20110265587A1
• Time in Patent Office: 1,467 Days
• Field of Search: 74/892.3, 74/892.5, 74/892.6, 74/893.2, 74/893.3, 74/893.5, 74/893.6, 74/894.2
• US Class Current: 74/89.33
• CPC Class Codes: F16K 31/50 with screw-spindle or internally threaded actuating means
• CPC Class Codes: F16K 31/508 the actuating element being rotatable, non-rising, and driving a non-rotatable axially-sliding element
• CPC Class Codes: Y10T 74/18576 including screw and nut
• CPC Class Codes: Y10T 74/18656 Carriage surrounded, guided, and primarily supported by member other than screw [e.g., linear guide, etc.]
• CPC Class Codes: Y10T 74/1868 Deflection related
• CPC Class Codes: Y10T 74/18728 Backlash

Abstract

A drive cartridge comprises an actuating mechanism, in which a spindle can be guided in a hollow cylindrical drive element between two end positions at an axial distance from one another. The positions are defined by the axial length of the drive element. A dome-shaped casing surrounds the drive element in a non-rotatable and non-displaceable manner. The drive element has an external contour with an eccentric profile and the internal contour of the dome-shaped casing has a positive fit only in those areas of the drive element in which the permissible normal stress exceeds a predefined upper limit.

Claims

1. A drive cartridge, comprising

an actuating mechanism, in which a spindle can be guided in a hollow cylindrical drive element between two end positions at an axial distance from another, said positions being defined by the axial length of the drive element;

and

a dome-shaped casing that surrounds the drive element in a non-rotatable and non-displaceable manner;

wherein said drive element comprises an outer contour having a out-of-roundness profile and that the internal contour of said dome-shaped casing has a positive fit only in those areas of the drive element in which the permissible normal stress exceeds a predefined upper limit; and

wherein said dome-shaped casing is constructed of a profile element adjoining the drive element and an outer skin surrounding said profile element.

2. The drive cartridge of claim 1, wherein said out-of-roundness profile is a polygon profile.

3. The drive cartridge of claim 2, wherein said polygon profile is a P4C profile.

4. The drive cartridge of claim 1, wherein said out-of-roundness profile is a profile on basis of complex cycloids.

5. The drive cartridge of claim 1, wherein said profile element consists of a partially aromatic thermoplastic having a fraction of reinforcing fibers of at least 20 weight %.

6. The drive cartridge of claim 5, wherein said outer skin consists of a fusible thermoplastic polymer which furthermore can be co-extruded with said partially aromatic thermoplastic.

7. The drive cartridge of claim 6, wherein thermoplastic polymer contains a bonding agent for producing a chemical bonding at least with said partially aromatic thermoplastic.

8. The drive cartridge of claim 6, wherein said a bonding agent is applied to the profile element and/or said outer skin on the areas to be bonded together.

9. The drive cartridge of claim 6, wherein said dome-shaped casing comprises a layer of thermoplastic polymer containing a bonding agent which is disposed between said profile element and said outer skin.

10. The drive cartridge of claim 1, wherein said profile element comprises an essentially constant wall thickness.

11. The drive cartridge of claim 1, wherein said profile element comprises a varying wall thickness.

12. The drive cartridge of claim 11, wherein said wall thickness is optimized according to the principles of bionics.

13. The drive cartridge of claim 1, wherein one or more exposed areas of said profile element where said profile element does not abut to said drive element, comprise slopes.