Blind fastener with high strength blind head and high clamp...

F - Mech Eng,Light,Heat,Weapons – 16 – B

Patent

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Details

F16B 13/04 (2006.01) F16B 19/10 (2006.01)

Patent

CA 2365976

A blind fastener (10) with a pin (24) having a pin shank (22) which extends through a cylindrical main sleeve (16) and expansion sleeve (18) whereby it can be gripped and pulled by an installation tool with the pin (24) having an enlarged pin head (42) at the blind end of the pin shank (22). The expansion sleeve (18) is located between the pin head (42) and the inner end of the main sleeve (16) and is adapted to move into the inner or blind end (30) of the main sleeve (16) to form a first tulip shaped blind head (100) for clamping workpieces together in response to a relative axial force applied between the sleeves (16, 18) and pin (24) by engagement of the pin head (42) with the expansion sleeve (18). As the axial force is increased the pin head (42) is moved into the expansion sleeve to form a second tulip head (104) to further clamp the workpieces and to secure the pin (24), main sleeve (16) and expansion sleeve (18) together at that end and is moved closely adjacent the workpiece surface at the blind side to form a high strength blind head.

La présente invention concerne une fixation en aveugle (10) présentant une broche (24) comportant une tige de broche (22) se prolongeant à travers une coquille principale cylindrique (16) et une coquille d'expansion (18) par lequel on peut la saisir et la tirer au moyen d'un outil d'installation avec la broche (24) comportant une tête de broche élargie (42) sur le côté caché de la tige de broche (22). La coquille d'expansion (18) se trouve entre la tête de broche (42) et l'extrémité intérieure de la coquille principale (16) pour constituer un première tête borgne en tulipe (100) destinée à serrer ensemble les pièces à travailler suite à une poussée axiale appliquée entre les coquilles (16, 18) et la broche (24) par l'engagement de la tête de broche (42) avec la coquille d'expansion (18). Au fur et à mesure de l'accroissement de la poussée axiale, la tête de broche (42) se déplace à l'intérieur de la coquille d'expansion pour constituer une deuxième tête en tulipe (104) destinée à enserrer davantage les pièces à travailler et à fixer la broche (24), la coquille principale (16) et la coquille d'expansion (18) ensemble à cette extrémité et se retrouve intimement adjacente à la surface sur le côté caché pour constituer une tête borgne haute résistance.

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