| 摘要 |
A multiple sleeve blind fastener has a relatively large bearing surface on the blind side of the material in which the fastener is to be mounted, such as the skin of an aircraft or the like. The fastener includes a nut on the driving side of the mating hole in the skin into which the fastener is to be inserted. The nut is threaded onto a core bolt which extends into the mating hole and terminates in a head on the blind side. A plurality of sleeves are rotatably mounted on the core bolt between the head and the nut, the sleeves being disposed on the blind side when the fastener is inserted into the mating hole. The nut includes a tapered body portion which also extends through the mating hole from the driving side into the blind side thereto. In operation, when the core bolt is tightened, the first sleeve rides onto the tapered body portion of the nut and the successive sleeves ride onto and over the preceding sleeves thereby forming a relatively large bearing surface on the walls surrounding the mating hole, this surface depending upon the total number of sleeves and thicknesses thereof.
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