Methods and apparatus for generating force and torque

• US 7,032,870 B2
• Filed: 08/02/2001
• Issued: 04/25/2006
• Est. Priority Date: 11/28/2000
• Status: Expired due to Term

• Current Assignee: Ergotron Incorporated (Melrose Industries Plc)
• Original Assignee: Ergotron Incorporated (Melrose Industries Plc)
• Inventors: Lindblad, Shaun C., Sweere, Harry C., Eliason, Jeffery M., Showalter, Matthew J., Ahmetoglu, Mustafa A., Alzebdeh, Khalid I.
• Primary Examiner(s): BAXTER, GWENDOLYN WRENN
• Application Number:
  US09/920,924
• Publication Number:
  US 20020088910A1
• Time in Patent Office: 1,727 Days
• Field of Search: 248/918, 248/316.3, 248/295.11, 248/298.1, 248/404, 248/161, 248/412, 248/162.1, 248/157, 108/146, 108/147, 108/148
• US Class Current: 248/295.11
• CPC Class Codes: F16M 11/10 around a horizontal axis F16M11/12 takes precedence
• CPC Class Codes: F16M 11/18 with mechanism for moving the apparatus relatively to the stand
• CPC Class Codes: F16M 11/2014 around a vertical axis F16M11/2035 takes precedence
• CPC Class Codes: F16M 11/24 changeable in height or length of legs, also for transport only, e.g. by means of tubes screwed into each otherF16M11/42 takes precedence
• CPC Class Codes: F16M 13/022 repositionable
• CPC Class Codes: F16M 2200/022 by friction
• CPC Class Codes: F16M 2200/041 for balancing rotational movement of the head
• CPC Class Codes: F16M 2200/045 for panning movement
• CPC Class Codes: Y10S 248/918 Ancillary device support associated with a video display screen
• CPC Class Codes: Y10S 248/919 Adjustably orientable video screen support

Abstract

A system for providing support and position control of a monitor. In one embodiment, a method of supporting a monitor includes converting an ascending energy storage member force curve into a substantially constant supporting force against the monitor. In one aspect, a method, of supporting a monitor includes providing an energy storage member and a cam which are cooperatively positioned so as to move relative to each other along the path of motion. As the energy storage member moves along the path relative to the cam, the cam displaces the energy storage member and thereby changes a force applied by the energy storage member on the cam, and wherein the cam converts the force applied by the energy storage member into a supporting force on the monitor.

Claims

1. An apparatus, comprising:

a cam having at least a first guiding surface;

a cam following assembly including a first following surface for engaging the first guiding surface of the cam at least at a first contact point, and a means for urging the first following surface against the first guiding surface of the cam;

the first following surface defining a contact angle with the first guiding surface of the cam;

the first guiding surface of the cam being shaped such that the contact angle of the first follower changes substantially continually as the cam following assembly moves along a longitudinal axis of the cam;

wherein the means for urging the first following surface against the first guiding surface of the cam comprises a leaf spring; and

wherein said spring is positioned between said cam and said cam following assembly.

2. The apparatus of claim 1, wherein the first guiding surface of the cam has a substantially continually changing slope.

3. The apparatus of claim 1, wherein the first guiding surface of the cam has a substantially continually changing radius of curvature.

4. The apparatus of claim 1, wherein the contact angle is defined by a first imaginary line extending through the first contact point and a central axis of the first following surface, and an imaginary reference line.

5. The apparatus of claim 1, wherein a deflection of the leaf spring varies in a manner substantially inversely proportionally to an associated variation in a trigonometric TAN function of the contact angle throughout a travel of the cam following assembly.

6. The apparatus of claim 1, wherein the cam is shaped such that movement of the cam following assembly along the longitudinal axis of the cam causes a deflection of the leaf spring and a change in the contact angle of the first following surface such that a magnitude of an axial force component of a reactionary force acting on the first following surface is substantially constant throughout a travel of the cam following assembly.

7. The apparatus of claim 1, wherein the leaf spring has a spring constant reflecting a substantially linear relationship between deflection and spring force.

8. The apparatus of claim 1, wherein the leaf spring has a spring function reflecting a substantially nonlinear relationship between deflection and spring force.

9. The apparatus of claim 1, wherein the cam is substantially symmetrical about the longitudinal axis thereof.

10. An apparatus, comprising:

a cam having at least a first guiding surface;

a cam following assembly including a first following surface for engaging the first guiding surface of the cam at least at a first contact point, and a means for urging the first following surface against the first guiding surface of the cam;

the first following surface defining a contact angle with the first guiding surface of the cam;

the first guiding surface of the cam being shaped such that the contact angle of the first follower changes substantially continually as the cam following assembly moves along a longitudinal axis of the cam;

wherein the means for urging the first following surface against the first guiding surface of the cam comprises a gas spring; and

wherein said spring is positioned between said cam and said cam following assembly.

11. The apparatus of claim 10, wherein the first guiding surface of the cam has a substantially continually changing slope.

12. The apparatus of claim 10, wherein the first guiding surface of the cam has a substantially continually changing radius of curvature.

13. The apparatus of claim 10, wherein the contact angle is defined by a first imaginary line extending through the first contact point and a central axis of the first following surface, and an imaginary reference line.

14. The apparatus of claim 10, wherein a deflection of the gas spring varies in a manner substantially inversely proportionally to an associated variation in a trigonometric TAN function of the contact angle throughout a travel of the cam following assembly.

15. The apparatus of claim 10, wherein the cam is shaped such that movement of the cam following assembly along the longitudinal axis of the cam causes a deflection of the gas spring and a change in the contact angle of the first following surface such that a magnitude of an axial force component of a reactionary force acting on the first following surface is substantially constant throughout a travel of the cam following assembly.

16. The apparatus of claim 10, wherein the gas spring has a spring constant reflecting a substantially linear relationship between deflection and spring force.

17. The apparatus of claim 10, wherein the gas spring has a spring function reflecting a substantially nonlinear relationship between deflection and spring force.

18. The apparatus of claim 10, wherein the cam is substantially symmetrical about the longitudinal axis thereof.