Drywall fastener
AssigneeJTB, Inc.
InventorBrian G. Harker
Life of this patent
Estimating the term…
Abstract
A drive-in expansion fastener is provided having a generally cylindrical, hollow body with a tapered end formed from an angular truncation of the body. The body is reinforced by at least one longitudinal rib so as to permit drive-in penetration from the tapered end even if the fastener is formed from plastic materials. The fastener is retained within the wall by at least one pair of hinged flanges which expand circumferentially in response to the threaded insertion of an ordinary screw within the hollow portion of the body. That screw engages an inclined surface within the body to cam the flanges outwardly. The flanges engage the back surface of the wall while a longitudinally slit portion of the body expands within the hole created by drive-in penetration.
Claims39
An expansion fastener for securing a retaining member, comprising:
- a generally cylindrical, longitudinally extending body portion;
- said body portion including a tapered portion at one end thereof;
- said body portion including a flange portion which expands circumferentially in response to insertion of said retaining member into said body portion;
- and
- prior to said expansion of said flange portion, said flange portion projects radially outward from said body portion.
An expansion fastener for securing a retention member to a board, comprising:
- a generally cylindrical, longitudinally extending body portion having a substantially longitudinal passageway therethrough;
- said body portion including a tapered means for facilitating penetration of said board by said body portion;
- said tapered means being formed by an angular truncation of one end of said body portion;
- said body portion including a retaining portion for preventing removal of said body portion from said board;
- said retaining portion including a flange member radially projecting from said body portion and extending longitudinally therewith;
- and
- said retaining portion expands circumferentially in response to insertion of said retention member into said passageway.
A drive-in expansion fastener for securing a retention element to a drywall or plaster board, comprising:
- a generally cylindrical, longitudinally extending body portion having a longitudinal passageway therethrough;
- said body portion including a tapered means having board-cutting edges for facilitating drive-in penetration of said board by said body portion;
- said tapered means being formed as an angular truncation of one end of said body portion;
- the angle of said truncation with respect to said body portion being established such that penetration of said board by said body portion does not result in formation of a blow out region on said board;
- a base portion formed on said body portion at an end opposite said tapered means;
- said base portion including a radially extending shoulder;
- said body portion including a retaining means longitudinally spaced apart from said shoulder for preventing removal of said body portion from said board;
- said retaining means including a flange portion radially projecting from said body portion;
- and
- an expansion means disposed within said passageway for circumferentially expanding said flange portion outwardly with respect to said body portion in response to insertion of said retention element into said passageway.
A drive-in expansion fastener for securing a retention element to a drywall or plaster board, comprising:
- a generally cylindrical, longitudinally extending body portion having a longitudinal passageway therethrough;
- said body portion including a tapered means having board-cutting edges for facilitating drive-in penetration of said board by said body portion;
- said tapered means being formed as an angular truncation of one end of said body portion;
- the angle of said truncation with respect to said body portion being established such that penetration of said board by said body portion does not result in formation of a blow out region on said board;
- said passageway is longitudinally exposed by said angular truncation such that board material is received therein during said drive-in penetration of said board by said body portion;
- a base portion formed on said body portion at an end opposite said tapered means;
- said base portion including a radially extending shoulder;
- said body portion including a retaining means longitudinally spaced apart from said shoulder for preventing removal of said body portion from said board;
- said retaining means includes a plurality of pairs of spaced apart hinged members, at least one of said pairs including a flange portion radially projecting from said body portion;
- the hinge base of said hinged members is formed by longitudinal slits in said body portion;
- and
- an expansion means disposed within said passageway for moving said flange portion outwardly with respect to the circumference of said body portion in response to insertion of said retention element into said passageway.
An expansion fastener for securing a retaining member, comprising:
- a generally cylindrical, longitudinally extending body portion;
- said body portion including a tapered portion at one end thereof;
- said body portion including a flange portion which expands circumferentially in response to insertion of said retaining member into said body portion;
- said tapered portion includes a cavity for receiving debris caused by insertion of said fastener into a board member;
- said body portion includes a generally longitudinal passageway therethrough;
- said cavity includes a portion of said passageway;
- and
- said passageway includes a longitudinal restriction having an inclined face for initial engagement with said retaining member.
Dependencies are inferred from the claim text.