Expansion fastener

Claim 2

An expansion fastener comprising: fastener body means comprising a head portion defining an axially extending throat, said throat defining a socket, a pair of axially extending anchoring members integrally extending from said head portion and having opposing interior surfaces defining an axial through slot communicating with said throat, a series of axially spaced teeth projecting from said anchor members, said anchor members having a rounded shank portion interposed between said head portion and said teeth; expander pin means comprising a head, a generally radially projecting shoulder portion defined by converging surfaces forming a quasi-V-shaped section adjacent said head, and a longitudinal body terminating in a tip, said pin means being dimensioned for reception in said throat, so that said expander pin means may be inserted in said throat and driven into said fastener body means wherein the pin means extends into said slot and interacts with said opposing interior surfaces to force apart said anchor members and said pin shoulder is locked in said socket.

Claim 3

The expansion fastener of claim 1 wherein said teeth radially project from said anchor members so as to define generally aligned pairs of generally arcuate transverse shoulders.

Claim 4

The expansion fastener of claim 2 wherein each said anchor member has six generally equidistantly axially spaced teeth.

Claim 5

The expansion fastener of claim 1 wherein the head portion includes a generally transversely extending head and the throat is generally centrally positioned relative to said head.

Claim 6

The expansion fastener of claim 1 wherein said anchor members are forced apart a greater distance at the terminal portions thereof than at intermediate portions thereof.

Claim 7

The expansion fastener of claim 1 wherein said anchor members terminate in tapered tips.

Claim 8

An expansion fastener comprising: a fastener body comprising a head portion, including a retaining head and defining a central, axially extending throat, a pair of substantially identical, axially extending anchor members integrally extending from said head portion and having opposing interior surfaces defining an axial slot communicating with said throat, a series of axially spaced teeth projecting from said anchor members, said anchor members having a rounded shank portion interposed between said head portion and said teeth; an expander pin having a head and a longitudinal body terminating in a tapered tip and dimensioned to be closely received in said throat, said longitudinal body having a generally uniform diameter greater than said first distance, said pin having a radially projecting shoulder defined by converging surfaces forming a quasi-V-shaped surface adjacent said head, so that said pin may be inserted into said throat and driven into said fastener body wherein the expander pin extends into the slot and wedgingly interacts with opposing interior surfaces to force apart said anchor members and said shoulder is closely received in said socket to prevent axial displacement of said pin from said fastener body.

Claim 9

An expansion fastener comprising: a fastener body comprising a head portion, including a retaining head and defining a central, axially extending throat, a pair of substantially identical, axially extending anchor members integrally extending from said head portion and having opposing interior surfaces defining an axial slot communicating with said throat, a series of axially spaced teeth projecting from said anchor members, said anchor members having a rounded shank portion interposed between said head portion and said teeth; an expander pin having a head and a longitudinal body terminating in a tapered tip and dimensioned to be closely received in said throat, said longitudinal body having a generally uniform diameter greater than said first distance, said pin having a radially projecting shoulder defined by converging surfaces forming a quasi-V-shaped surface adjacent said head, so that said pin may be inserted into said throat and driven into said fastener body wherein the expander pin extends into the slot and wedgingly interacts with opposing interior surfaces to force apart said anchor members and said shoulder is closely received in said socket to prevent axial displacement of said pin from said fastener body.

Claim 10

The expansion fastener of claim 7 wherein each said anchor member has six generally equidistantly axially spaced teeth.

Claim 11

An expansion fastener comprising: fastener body means comprising a head portion defining an axially extending throat, said throat further defining an axially symmetric socket, a pair of axially extending anchor members integrally extending from said head portion and having opposing interior surfaces defining an axial through slot communicating with said throat, a series of axially spaced teeth projecting from said anchor members, said anchor members having a rounded shank portion interposed between said head portion and said teeth; expander pin means comprising a head, a longitudinal body terminating in a tip, and an axially symmetric radially projecting shoulder adjacent said head and having a diameter greater than said head, said pin being dimensioned for reception in said throat, so that said expander pin means is insertable in said throat and drivable into said fastener body means wherein the pin extends into said slot and interacts with said opposing interior surfaces to force apart said anchor members and said pin projecting portion is received in said socket to axially lock the expander pin means to the fastener body means.

Claim 12

An expansion fastener comprising: fastener body means comprising a head portion defining an axially extending throat, said throat further defining an axially symmetric socket, a pair of axially extending anchor members integrally extending from said head portion and having opposing interior surfaces defining an axial through slot communicating with said throat, a series of axially spaced teeth projecting from said anchor members, said anchor members having a rounded shank portion interposed between said head portion and said teeth; expander pin means comprising a head, a longitudinal body terminating in a tip, and an axially symmetric radially projecting shoulder adjacent said head and having a diameter greater than said head, said pin being dimensioned for reception in said throat, so that said expander pin means is insertable in said throat and drivable into said fastener body means wherein the pin extends into said slot and interacts with said opposing interior surfaces to force apart said anchor members and said pin projecting portion is received in said socket to axially lock the expander pin means to the fastener body means.

Claim 13

The expansion fastener of claim 9 wherein said teeth radially project from said anchor members so as to define generally aligned pairs of generally arcuate transverse shoulders.

Claim 14

The expansion fastener of claim 10 wherein each said anchor member has six generally equidistantly axially spaced teeth.

Claim 15

The expansion fastener of claim 1 wherein said expander pin means further comprises a radially projecting collar axially spaced from said shoulder, said collar being dimensioned for reception in said socket to releasably retain said expander pin means to said fastener body means.

Claim 16

The expansion fastener of claim 7 wherein said expander pin further comprises a circumferential radially projecting collar axially spaced from said shoulder, said collar being dimensioned for reception in said socket to releasably retain said expander pin to said fastener.

Claim 17

The expansion fastener of claim 9 wherein said expander pin means further comprises a radially projecting collar axially spaced from said shoulder, said collar being dimensioned for reception in said socket to releasably retain said expander pin means to said fastener body means.