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US 4,785,673 AGranted
Strain-gauge sensor for measuring forces
AssigneeS.C.A.I.M.E. S.A.
InventorJean-Pierre Aumard
Life of this patent
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Abstract
The sensor is formed of a hollow profile (1) of rectangular cross-section, which has two symmetrical transverse notches (2, 3) and two other symmetrical transverse notches (4, 5) at a distance from the first. These notches pass through the thickness of the large side walls (6) of the profile and, in the case of each pair (2,3 and 4, 5), leave intact but mechanically weakened regions (8) between them, to which strain gauges (9) are fixed.
Claims7
A strain-gauge sensor for measuring forces, comprising:
- a hollow profile (1) of substantially rectangular cross section and having at least a first two transverse notches (2, 3) in opposite side walls (6) of the profile arranged symmetrically relative to one another and each passing through the thickness of the side wall thereof for leaving intact two mechanically weakened, planar regions (8) of the profile therebetween,
- wherein the cross section of the profile (1) is a non-square rectangle for the profile to have, alternating circumferentially, two large and two small side walls (6, 7), and
- wherein the transverse notches (2, 3) are elongated rectangles on the two large side walls (6) of the profile with their elongated directions perpendicular to the two small side walls (7) of the profile and extend wholly across the large side walls (6), whereby the weakened regions (8) are formed by symmetrical strips of the small side walls (7) between the transverse notches (2, 3);
- and
- a strain-gauge (9) fixed to one of the weakened regions (8) of the profile.
2 more elements
A strain-gauge sensor for measuring forces, comprising:
- a hollow profile (12) of substantially rectangular cross section and having at least a first two transverse notches (14, 15) in respective, opposite side walls of the profile arranged symmetrically relative to one another and each passing through the thickness of the side wall thereof for leaving intact two mechanically weakened, planar regions of the other side walls of the profile between the opposite side walls,
- wherein the profile (12) further comprises a median longitudinal inner wall (13) parallel to the other side walls of the profile and extending at least substantially between the opposite side walls for the first transverse notches (14, 15) to produce a local weakened part (24) on the inner wall (13) at the first transverse notches;
- and
- a strain gauge on the local weakened part (24) of the inner wall (13).
1 more element
A strain gauge sensor for measuring forces, comprising:
- a hollow profile 26 of substantially rectangular cross section and having at least a first two transverse notches (30, 31) in respective, opposite side walls of the profile arranged symmetrically relative to one another and each passing through the thickness of the side wall thereof for leaving intact two mechanically weakened, planar regions of the profile therebetween, and a second two of the transverse notches (32, 33) spaced from the first two;
- an elongate plate median wall (27) fixed on longitudinal slides (28, 29) on the insides of the opposite side walls of the hollow profile for having first and second local weakened parts between transverse notches (30', 31', 32', 33') corresponding to the first and second transverse notches (30, 31 and 32, 33);
- and
- at least one strain gauge fixed to one of the local weakened parts.
1 more element
Dependencies are inferred from the claim text.