Force Sensing Device

• US 20080083290A1
• Filed: 07/25/2005
• Published: 04/10/2008
• Est. Priority Date: 07/23/2004
• Status: Abandoned Application

• Current Assignee: Siemens AG
• Original Assignee: Siemens AG
• Inventors: Stadler, Franz
• Application Number:
  US11/632,781
• Publication Number:
  US 20080083290A1
• Time in Patent Office: Days
• US Class Current: 73/862.625
• CPC Class Codes: B22D 17/00 Pressure die casting or injection die casting, i.e. casting in which the metal is forced into a mould under high pressure
• CPC Class Codes: B60N 2/002 Seats provided with an occupancy detection means mounted therein or thereon detection means responsive to presence or absence of children B60N2/266
• CPC Class Codes: B60R 21/01516 using force or pressure sensing means
• CPC Class Codes: G01G 19/4142 for controlling activation of safety devices, e.g. airbag systems electrical circuits for triggering safety arrangements in case of vehicle accidents B60R21/015

Abstract

A force sensing device has a monolithic metal housing with a rigid upper housing part and a rigid lower housing part, which are interconnected via U-shaped spring elements while being movable in a springy manner towards each other along an axis of movement when a force is applied thereto. The spring elements are disposed symmetrically to one another relative to a cross-sectional area that runs parallel to the axis of movement. A deflection sensor is disposed between the upper and lower rigid housing parts for detecting their movement relative to one another. The unitary housing is produced in metal injection molding (MIM) technology.

Claims

1-7. -7. (canceled)

8. A force sensing device, comprising:

a metal-injection molded, monolithic metal housing formed with a rigid upper housing part, a rigid lower housing part, and U-shaped spring elements interconnecting said upper and lower housing parts and allowing said upper and lower housing parts to move in a springy manner towards each other along an axis of movement when a force is applied thereto;

said spring elements being disposed symmetrically to one another relative to a cross-sectional area extending parallel to said axis of movement; and

a deflection sensor disposed between said upper and lower housing parts for detecting a relative movement therebetween.

9. The force sensing device according to claim 8, wherein each of said U-shaped spring elements is formed with legs enclosing an acute angle.

10. The force sensing device according to claim 8, wherein said spring elements have a defined wall thickness initially decreasing from a start at said rigid upper housing part, and once more increasing towards an apex of said spring element.

11. The force sensing device according to claim 8, wherein said lower housing part includes at least one attachment bracket for rigidly attaching the force sensing device to a chassis of a motor vehicle.

12. The force sensing device according to claim 11, wherein said attachment bracket is formed to be bolted to the motor vehicle chassis.

13. The force sensing device according to claim 8, wherein said housing includes at least four U-shaped spring elements, with two said spring elements projecting in a common direction from said cross-sectional area in each case.

14. The force sensing device according to claim 13, wherein said lower housing part includes two attachment brackets, respectively disposed between two said spring elements, for rigidly attaching the force sensing device to a chassis of a motor vehicle

15. The force sensing device according to claim 11, wherein said upper housing part is formed with a flange engaging below attachment means attaching said lower housing part to the motor vehicle chassis, such that, with said lower housing part rigidly connected to the motor vehicle chassis and a suitably large tension force acting on said upper housing part, a deflection of said upper and lower housing parts relative to one another is limited.