Washer for use in mining

E - Fixed Constructions – 21 – D

Patent

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Details

E21D 21/00 (2006.01) E21D 21/02 (2006.01) F16B 31/02 (2006.01) F16B 43/00 (2006.01) F16B 43/02 (2006.01)

Patent

CA 2192325

The washer is of frusto-conical shape as viewed externally and consits of a body (21) and a tapered flange (23) depending therefrom. When the lip (28) of the flange rests on a flat surface and the washer is subjected to a predetermined compressive load (26) the tapering of the flange leads to its deformation radially outward. This expansion acts as a visual indication that the predetermined load has been applied. The flattening of the flange which also accompanies its deformation increases the contact area of the washer with the underlying surface and thereby reduces contact stresses. When used in rockbolting, hole (22) receives a rock bolt and the void defined by the flange (23) can accommodate a raised portion of a load plate. The recess (30) receives a bearing assembly or a domed element (the latter compensates for misalignment of the bolt with the surface) so as to transmit tightening loads from the nut of the rock bolt to the washer, etc.

Vue de l'extérieur, la rondelle a une forme tronconique avec un corps (21) et une bride effilée (23) qui descend du corps. Lorsque la lèvre (28) de la bride (28) repose sur une surface plate et que la rondelle est soumise à une force de compression prédéterminée (26), la forme effilée de la bride lui permet de se déformer radialement vers l'extérieur. Cette expansion permet de constater visuellement que l'on avait appliqué une charge prédéterminée. L'aplatissement de la bride qui accompagne cette déformationm augmente la surface de contact de la rondelle avec la surface sous-jacente et diminue ainsi les contraintes de contact. Lorsqu'on utilise la rondelle dans des mines, le trou (22) reçoit un boulon et l'espace délimité par la bride (23) peut recevoir une portion surélevée d'une plaque de support. Le creux (30) reçoit un dispositif de support ou un élément concave (celui-ci corrige un mauvais alignement éventuel du bouton par rapport à la surface) permettant de transmettre les charges de serrage de l'écrou au boulon, à la rondelle, etc.

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