Cutting arrangement

E - Fixed Constructions – 21 – C

Patent

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Details

E21C 35/197 (2006.01) E21C 35/19 (2006.01) E21C 35/18 (2006.01)

Patent

CA 2380404

A cutting arrangement (10) includes a pick holder (12) having a bore (14) containing a sleeve (16) within which a shank (18) of a pick (20) is located. The pick (20) and the sleeve (16) each have heads (22; 24). The head (24) of the sleeve (16) has an outer abutting surface (26) and an inner abutting surface (30). The outer abutting surface (26) abuts an abutting surface (28) of the head (22) of the pick (20). The inner abutting surface (30) abuts an shutting surface (32) of the pick holder (12). The abutting surface (28) of the head (22) of the pick (20) has an outwardly curved formation (28.1) which abuts an inwardly curved formation (26.1) on the outer abutting surface (26) of the sleeve (16). The inner abutting surface (30) on the head (24) of the sleeve (16) has an outwardly curved formation (30.1). The abutting surface (32) of the pick holder (12) has an inwardly curved formation (32.1). The inwardly and outwardly curved formations (30.1: 32.1) abut one another.

Selon cette invention, un dispositif de coupe (10) comprend un support de pointe (12) comportant un trou (14) dans lequel est placée une douille (16) dans laquelle on met la hampe (18) de la pointe (20). La pointe (20) et la douille (16) possèdent chacune une tête (22; 24). La tête (24) de la douille (16) possède une surface externe en about (26) et une surface interne en about (30). La surface externe en about (26) est placée en about contre la surface en about (28) de la tête (22) de la pointe (20). La surface interne en about (30) est placée en about contre une surface en about (32) du support de pointe (12). La surface en about (28) de la tête (22) de la pointe (20) possède une formation incurvée vers l'extérieur (28.1) qui est placée en about contre une formation incurvée vers l'intérieur (26.1) sur la surface externe en about (26) de la douille (16). La surface interne en about (30) sur la tête (24) de la douille (16) possède une formation incurvée vers l'extérieur (30.1). La surface en about (32) du support de pointe (12) possède une formation incurvée vers l'intérieur (32.1). Les formations incurvées vers l'intérieur et l'extérieur (30.1; 32.1) sont placées en about l'une par rapport à l'autre.

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