초록 ▼

A blind fastener for fastening bodies together comprises a hollow tubular sleeve and a core bolt passing through the sleeve. The sleeve has a head at its front end to engage the front of the fastened bodies and the bolt has a head at its front end to engage the head of the sleeve. The sleeve has two

A blind fastener for fastening bodies together comprises a hollow tubular sleeve and a core bolt passing through the sleeve. The sleeve has a head at its front end to engage the front of the fastened bodies and the bolt has a head at its front end to engage the head of the sleeve. The sleeve has two sections, the first of which, adjacent to the sleeve head, has an internal diameter to fit over the core bolt, and the second of which, at the end of the sleeve remote from the sleeve head, has a larger internal diameter to leave an annular space between the core bolt and this second section. The end portion of the core bolt remote from the bolt head is threaded to engage the threads of a nut. The nut has a head rearward from the sleeve, from which there protrudes a tubular shank which extends into the annular space toward the sleeve head. The nut has an outside diameter larger than that of the nut shank but no greater than that of the sleeve. A deformable collar is positioned over the nut shank between the nut head and the end of the sleeve remote from the sleeve head. This assembly of the sleeve, bolt, nut and collar is adapted to pass through aligned holes through bodies to be fastened together, so that the sleeve head is at the front side of the bodies and the nut head, collar and rear end of the sleeve are at the rear side of the fastened bodies. When the nut is drawn toward the sleeve head, which may be done by pulling it by use of a mandrel in the absence of the core bolt, the deformable collar expands over the sleeve end and advances toward the sleeve head until it meets the rear of the fastened bodies, thereby setting the fastener. In a modification, a section of the collar nearest the sleeve head is made relatively thin as compared with the remainder of the collar so that while the nut is being drawn toward the sleeve head, the thin section first deforms outwardly until it meets the rear of the fastened bodies and then turns inwardly to meet the outer circumference of the sleeve, thereby setting the fastener. After removal of the mandrel the core bolt is torqued into the nut.

대표청구항 ▼

A blind fastener pre-assembly comprising: a hollow tubular sleeve having a head and having a first section and a second section; the first section having a smaller internal diameter than that of the second section and being disposed between the head and the second section; a nut having a head and a

A blind fastener pre-assembly comprising: a hollow tubular sleeve having a head and having a first section and a second section; the first section having a smaller internal diameter than that of the second section and being disposed between the head and the second section; a nut having a head and a tubular shank protruding forwardly from the nut head, a forward part of the nut shank being fitted within a rear part of said second section of the sleeve; a metallic tubular collar more deformable and ductile than the nut and sleeve, positioned around the nut shank between the nut head and the rear end of the second sleeve section, said collar being expandable and slidable forwardly over the rear end of the second sleeve section; whereby when the pre-assembly is passed through bodies to be fastened, with the sleeve head at the front side of said bodies, and the rear end of the sleeve at the rear side of said bodies, the nut can be pulled toward the sleeve head so that a portion of the collar expands and slides forwardly over the second sleeve section and abuts the rear of the bodies, and a core bolt may be passed through the sleeve and torque into the nut to secure the fastener.