The patent's assignee is
News editors obtained the following quote from the background information supplied by the inventors: "Applicant has made many innovations in the area of fasteners, particularly for fastening wear plates to a structure. An example of one such fastener is described in International publication no. WO 2006/018245. The fastener described in the aforementioned publication is a nutless bolt which is inserted into a hole from one side of a surface and is applied or fixed in place by attaching an application tool to a head of the bolt and driving a pin into a bore formed centrally through the head and a shank of the bolt. The shaft is provided with a number of radially extending channels each of which provides a race for a corresponding ball. When the pin is driven in a down hole direction into the shaft it forces the balls to move radially along their respective channels so as to protrude partially from the channels beyond an outer circumferential surface of the shaft. This prevents the fastener from being removed in a direction opposite to the direction of insertion and in effect locks the fastener in place. To remove the fastener, the pin is pushed further in the down hole direction and falls from the shaft. This enables the balls to roll in a radially inward direction so as to lie within the outer circumferential surface of the shaft. Thus the fastener can now be removed from the hole. The ability to remove the fastener from the hole characterises the fastener as a bolt. This is to be contrasted from rivets which can only be removed by destroying the rivet itself."
As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventor's summary information for this patent application: "A nutless bolt comprising: a body having a shaft capable of insertion in to a hole and a stop coupled to the body, the stop configured to stop the body falling wholly into or through the hole, the shaft being provided with an axially extending bore; a locking mechanism disposed in the shaft and operable to extend radially from the shaft to lock the body in the hole; and, an actuating mechanism disposed in the shaft and being movable axially in the bore in a down hole direction from a locking position where the actuating mechanism causes the locking mechanism to extend radially from the shaft to lock the body in the hole, to a release position down hole of the locking position where the actuating mechanism is retained in the body and displaced relative to the locking mechanism to a location enabling the locking mechanism to retract radially into the shaft and the bolt to be withdrawn.
"In some embodiments the bore is configured to prevent the actuating mechanism from falling from the body when moved to the release position.
"In some embodiments bore comprises a blind hole which is closed at a down hole end of the shaft and open at an up hole end of the shaft.
"In some embodiments the bore is provided at a down hole end of the shaft with an opening of a diameter less than a maximum outer diameter of the actuating mechanism wherein a portion of the actuating mechanism can protrude from the down hole end of the shaft when the locking mechanism is in the release position. In these embodiments the bolt may comprise a frangible seal formed across the opening at the down hole end of the shaft wherein when the actuating mechanism is moved to the release position, a portion of the actuating mechanism ruptures the frangible seal.
"In some embodiments the bolt comprises a resilient O-ring retained in the stop. In such embodiments the stop may be provided with a circumferential groove which seats the O-ring.
"In some embodiments the stop is provided with an outer circumferential surface having opposite first and second axial ends wherein the first axial end is located closest the hole when the fastener is inserted into the hole, and wherein the first axial end has a smaller diameter than the second axial end.
"In some embodiments the outer circumferential surface of the stop is generally tapered at a first angle between the first and second axial ends.
"In some embodiments the bolt comprises a head engagable with the body.
"In some embodiments the body is provided with a threaded portion adjacent the stop.
"In some embodiments the bolt comprises a head threadingly engagable with the threaded portion of the body.
"In some embodiments the head is provided with a through hole positioned to align axially with the bore in the shaft.
"In some embodiments the head is provided with an outer circumferential surface which tapers at the first angle.
"In some embodiments the head is formed of a harder wearing material than the body.
"In some embodiments the bolt comprises a quantity of grease or like material disposed in the shaft in a region between a down hole end of the shaft and the locking mechanism.
"In some embodiments the shaft comprises a plurality of radially extending channels, each channel opening into the bore and onto an outer circumferential surface of the body and configured to allow a portion of the locking mechanism to protrude beyond the outer surface of the shaft when the actuating mechanism is in the locking position.
"In some embodiments the locking mechanism comprises a plurality of balls.
"In some embodiments the bolt comprises a sleeve disposed about the body at a location where when the actuating mechanism is in the locked position the locking mechanism is retained between the actuating mechanism and the sleeve and is disposed partly within and partly outside of the body.
"In some embodiments the sleeve has an undeformed state where the sleeve has an outer surface of constant outer diameter and retains the locking mechanism in the body prior to the actuating mechanism being moved to the locking position; and an expanded state where the sleeve is expanded radially outwards by the locking mechanism when the actuating mechanism is moved to the locking position.
"In some embodiments the sleeve is configured such that a portion of the sleeve extends into the hole into which the shaft is inserted, and a portion of the sleeve extends from the hole.
"In some embodiments the shank comprises a first portion adjacent the stop of a first outer diameter, and a second portion contiguous with the first portion having a stepped reduction in outer diameter relative to the first portion, and wherein the shank and the sleeve are relatively configured so that when the sleeve is provided over the second portion of the shank, an outer diameter of the sleeve adjacent the first portion of the shank is essentially equal to the outer diameter of the first portion of the shank.
BRIEF DESCRIPTION OF THE DRAWINGS
"FIG. 1 is a schematic representation of an embodiment of a nutless bolt in accordance with the present invention in use fastening a wear plate to a structure;
"FIG. 2 is a view of section AA of bolt shown in FIG. 1;
"FIG. 3 is a end elevation of the bolt shown in FIG. 1;
"FIG. 4 is a representation of a body of the bolt shown in FIG. 1;
"FIG. 5a is a representation of a second embodiment of the bolt;
"FIG. 5b is a representation of a third embodiment of the bolt; and,
"FIG. 5c is a representation of fourth embodiment of the bolt."
For additional information on this patent application, see: Davies, Brian T. Nutless Bolt. Filed
Keywords for this news article include:
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