Load detector

A load detector comprising:

• a pin-like member arranged between force-transmitting members and adapted to receive a load;
• a hole formed in the pin-like member along a neutral axis thereof for bending deformations thereof;
• an insertion member inserted in the hole and having at both end parts thereof securement portions coupled with the pin-like member and including at a central part thereof at least on deformation-sensing portion which is located between said securement portions and is provided with an axis of symmetry thereof coincident or nearly coincident with the neutral axis of the pin-like member, wherein said at least one deformation sensing portion is responsive to each load applied to the pin-like member and undergoes deformation and hence enlarges resulting strain;
• and
• means for converting the extent of deformation of the deformation-sensing portion of the insertion member into signals so as to obtain only a portion of the resulting strain which portion has been produced by each shear deformation of the pin-like member, wherein the deformation-sensing portion further comprises at least one pair of thin-walled portions arranged symmetrically in mutually-opposing relationship relative to the neutral axis of the pin-like member for bending deformations thereof and at least one pair of additional thin-walled portions arranged symmetrically in mutually-opposing relationship relative to the neutral axis of the pin-like member for bending deformation thereof in such a way that the latter thin-walled portions cross at right angles with the former thin-walled portions;
• and each of the former and latter thin-walled portions is provided with the means for converting the extent of deformation into a signal.