Blind bolt and tool combination
A blind bolt and tool is used for fastening a bolt through a hole in a structure when only one side of the structure is accessible. A receiver is formed on the tip end of a bolt shaft opposite from a bolt head. Internal threads are formed within the receiver proximate an outward end, and a hex socket is formed in the inward end of the receiver. External threads and a guide are formed on a tip of the tool, and the external threads mate with the internal threads in the receiver to hold the bolt during installation. A hex key on one end of the tool engages the hex socket in the receiver so that the tool may impose a torque on the bolt when a nut is being tightened on the bolt. In another embodiment, a splined tip is formed on the end of the bolt. The tip is designed to shear off when a sufficient torque is applied. Also, a shim is configured to fit between structures held together by the blind bolt.
1. A blind bolt for extending through a hole, the hole having a diameter, a length, a proximate end and a distal end, the hole extending through a first member and a second member with a surface formed on the second member adjacent the distal end of the hole, and with an interface between the first member and the second member, the blind bolt comprising:
a blind bolt shaft having a length greater than the length of the hole and having a distal end and a proximate end with threads formed on the blind bolt shaft adjacent the proximate end;
a blind bolt head on the distal end of the blind bolt shaft, the blind bolt head having a diameter that is smaller than the diameter of the hole;
a folding washer being foldable along a fold line for being disposed on the distal end of the threaded blind bolt shaft between the blind bolt head and the surface on the second member, the folding washer having a folded configuration with a dimension and a configuration such that it may pass through the hole and having an unfolded configuration with a diameter greater than the diameter of the hole and configured such that it may not pass through the hole;
a shear sleeve disposed on the blind bolt shaft proximate the distal end of the blind bolt shaft and having a length dimension sufficient to extend across the interface between the first and second members;
a nut threaded on the proximate end of the threaded blind bolt shaft; and
a means disposed between the shear sleeve and the nut, the means for transmitting a force for pushing and sliding the shear sleeve within the hole into a position extending across the interface between the first member and the second member, the shear sleeve being dimensioned to slide on the blind bolt shaft within the hole in response to the force of the means.
2. The blind bolt of claim 1 further comprising a washer disposed on the blind bolt shaft between the nut and the means.
3. The blind bolt of claim 1 where the means is secured to the shear sleeve.
4. The blind bolt of claim 1 where the means is not secured to the shear sleeve.
5. The blind bolt of claim 1 wherein the shear sleeve is continuous around its circumference.
6. The blind bolt of claim 1 wherein the combined length of the shear sleeve and the force means is greater than the length of the hole.