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US 4,396,025 AGranted
Apparatus for measuring the elastic characteristics of skin
AssigneeL'oreal
InventorsJean P. De Rigal, Jean-Luc M. Leveque
Life of this patent
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Abstract
The elastic properties of skin are measured by applying a torque to a disc placed in contact with a portion of the skin while holding a guard ring against skin around the region to define an annular skin sample to be stressed. Rotation of the disc is measured, and then the rotation is partially reversed and the torque-applying connection to the disc removed. The recovery rotation of the skin in the substantial absence of any applied torque is then measured.
Claims12
In apparatus for measuring the elastic characteristics of skin by applying a torque thereto, said apparatus comprising:
- (a) a disc rotatable about an axis along an angular travel for applying the torque;
- (b) a guard ring coaxial with the disc, to be applied to the skin to delimit around the disc an annular skin sample to be subjected to the measurement;
- (c) driving means connected to the disc to apply thereto a moment around its axis;
- and
- (d) measurement means for determining the rotation of the disc;
- the improvement comprising:
- (e) one-way coupling means ensuring rotational connection between disc and the driving means in a single direction of rotation;
- and
- (f) means effective to achieve reversal of the direction of rotation of the driving means over a fraction of said angular travel after said moment has been applied to the disc.
6 more elements
Dependencies are inferred from the claim text.