Locking device for a height and tilt adjustable steering column in a motor vehicle

• US 6,390,717 B1
• Filed: 08/02/2000
• Issued: 05/21/2002
• Est. Priority Date: 10/08/1998
• Status: Expired due to Fees

• Current Assignee: Nacam Deutschland GmbH (Robert Bosch GmbH)
• Original Assignee: Nacam Deutschland GmbH (Robert Bosch GmbH)
• Inventors: Bär, Andreas
• Primary Examiner(s): KIM, HARRY CHONG HYUN
• Application Number:
  US09/581,302
• Time in Patent Office: 657 Days
• Field of Search: 403/104, 403/105, 403/110, 403/373, 403/DIG.1, 744/93, 744/92, 280/775, 280/777
• US Class Current: 403/104
• CPC Class Codes: B62D 1/184 Mechanisms for locking columns at selected positions
• CPC Class Codes: Y10S 403/01 Magnetic
• CPC Class Codes: Y10T 403/32426 Plural distinct positions

Abstract

A locking device for two components of a height- and tilt-adjustable motor vehicle steering column, that has components that are displaceable in relation to one another, is disclosed. One component is fixed on a bracket stationarily connected to the body of the motor vehicle and the other component is part of a steering column housing accommodating the steering column, with at least two toothed surfaces each fixed on the components that are displaceable in relation to one another. The toothed surfaces have each at least one row of teeth with a plurality of teeth arranged next to one another. The free tips of the teeth of the two rows, which free tips face one another, are mutually repelled by magnetic forces.

Claims

1. A locking device for two components of a height-adjustable and tilt-adjustable motor vehicle steering column, the components being displaceable in relation to one another with one component being fixed on a bracket stationarily connected to a body of a motor vehicle and the other component being part of a steering column housing accommodating the steering column, the locking device comprising:

a first toothed surface fixed to one component;

a second toothed surface fixed to the other component, the first toothed surface and the second toothed surface each having at least one row of teeth with a plurality of teeth arranged next to one another, the second toothed surface being brought into engagement with first toothed surface wherein free tips of the teeth of the two rows, which free tips face one another, are mutually repelled by magnetic forces.

2. A locking device in accordance with claim 1, wherein the free tips of the teeth of the two rows, which tips face one another, have equal magnetic north polarity.

3. A locking device in accordance with claim 2, wherein the teeth of the two rows include tooth bottoms located between the tips of the teeth of the two rows, which tips face one another, said tooth bottoms having a magnetic polarity that is opposite the polarity of the free tips of the teeth.

4. A locking device in accordance with claim 1, wherein the free tips of the teeth of the two rows, which tips face one another, have equal magnetic south polarity.

5. A locking device in accordance with claim 4, wherein the teeth of the two rows include tooth bottoms located between the tips of the teeth of the two rows, which tips face one another, have a magnetic polarity that is opposite the polarity of the free tips of the teeth.

6. A locking device in accordance with claim 1, wherein the free tips of the teeth of the two rows, which tips face one another, have equal magnetic north polarity and the teeth of the two rows include tooth bottoms tooth bottoms arranged between the tips, the tooth bottoms having equal south polarity.

7. A locking device in accordance with claim 1, wherein the free tips of the teeth of the two rows, which tips face one another, each have equal magnetic south polarity and the teeth of the two rows include tooth bottoms, the tooth bottoms being arranged between the tips each have equal north polarity.

8. A locking device in accordance with claim 1, wherein two magnetic strips provided with individual magnets are provided one over another adjacent to the toothed surfaces, on each of the components that are displaceable in relation to one another, the components displaceable in relation to one another include a mobile component and a stationary bracket respectively, the toothed surfaces being brought into engagement with one another, wherein the individual magnets are arranged at spaced locations at a distance corresponding to half a tooth pitch of the teeth arranged next to one another and wherein individual segments have equal polarization.

9. A locking device for two components of a height-adjustable and tilt-adjustable motor vehicle steering column, the components being displaceable in relation to one another with one component being fixed on a bracket stationarily connected to a body of a motor vehicle and the other component being part of a steering column housing accommodating the steering column, the locking device comprising:

a first toothed surface fixed to one component;

a second toothed surface fixed to the other component, the first toothed surface and the second toothed surface each having at least one row of teeth with a plurality of teeth arranged next to one another, the second toothed surface being brought into engagement with first toothed surface;

magnetic forces associated with said toothed surfaces for mutually repelling facing free tips of the teeth of the two rows.

10. A locking device in accordance with claim 9, wherein said magnetic forces are provided by said free tips of the teeth of the two rows being magnetic, which tips face one another, having equal magnetic north polarity.

11. A locking device in accordance with claim 10, wherein the teeth of the two rows include tooth bottoms, located between said free tips of the teeth of the two rows, which tips face one another, have a magnetic polarity that is opposite the polarity of the free tips of the teeth.

12. A locking device in accordance with claim 9, wherein the magnetic forces are provided by said free tips of the teeth of the two rows, which tips face one another, having equal magnetic south polarity.

13. A locking device in accordance with claim 12, wherein the teeth of the two rows include tooth bottoms located between the tips of the teeth of the two rows, which tips face one another, have a magnetic polarity that is opposite the polarity of the free tips of the teeth.

14. A locking device in accordance with claim 9, wherein magnetic forces are provided by said free tips of the teeth of the two rows, which tips face one another, have equal magnetic north polarity and the teeth of the two rows include tooth bottoms arranged between the tips having equal south polarity.

15. A locking device in accordance with claim 9, wherein magnetic forces are provided by said free tips of the teeth of the two rows, which tips face one another, each having equal magnetic south polarity and the teeth of the two rows include tooth bottoms arranged between the tips each having equal north polarity.

16. A locking device in accordance with claim 9, wherein magnetic forces are provided by two magnetic strips provided with individual magnets, one magnet strip over another with each of said magnet strips being connected to a respective one of the components, each of said magnet strips being adjacent to the toothed surfaces.

17. A locking device in accordance with claim 16, wherein the teeth of the two rows include tooth bottoms arranged between the free tips and wherein individual magnets arranged next to one another of each of the magnetic strips are arranged at spaced locations at a distance corresponding to half a tooth pitch of the teeth arranged next to one another with segments corresponding to the free tips of the teeth of the two rows and segments corresponding to the tooth bottoms having equal polarization.

18. A locking device and height-adjustable and tilt-adjustable motor vehicle steering column component combination, the combination comprising:

a fixed component fixed on a bracket stationarily connected to a body of a motor vehicle;

a movable component displaceable in relation to said fixed component, said movable component being part of a steering column housing accommodating the steering column; and

a locking device including a first toothed surface fixed to said fixed component, a second toothed surface fixed to said movable component, said first toothed surface and said second toothed surface each having at least one row of teeth with a plurality of teeth arranged next to one another, said second toothed surface being brought into engagement with first toothed surface and with magnetic forces associated with said toothed surfaces for mutually repelling facing free tips of the teeth.