Lockbolt
AssigneeAdvel UK Limited
InventorsJonathan Brewer, Carl Hersant
Life of this patent
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Abstract
A lockbolt for installation into apertured workpiece members, comprising a pin having a head and a tail end provided with locking grooves and a single pull groove, wherein an installation tool having a collet with a corresponding shape to the pull groove is used to apply an increasing pulling force to the pin tail, thereby to push the collet towards the workpiece, and as the force applied by the hydraulic piston further increases, causing the collar to be swaged into the lock grooves, and halting the force applied by the tool either at a predetermined maximum value or when the pin tail breaks at a breaker groove formed by the single pull groove.
Claims20
A lockbolt comprising a collar and a pin;
- the pin comprising a pin head and a pin tail adapted to be inserted through aligned apertures in workpiece members;
- the pin tail comprising:
- a locking portion comprising locking grooves,
- only a single pull groove, the single pull groove including a first tapered section, a second tapered section and a plain portion between the first tapered section and the second tapered section, one of the first tapered section and the second tapered section of the single pull groove providing a contact surface against which an axial pulling force can be applied, the single pull groove being provided between the locking portion and an end face of the pin tail remote from the pin head, and
- an end portion provided between the pull groove and the end face;
- the collar being adapted to be fitted over the locking grooves and swaged onto the locking grooves.
Dependencies are inferred from the claim text.