US4601625A — Self drilling threaded insert for drywall

Claim 1

Independent Claim 79 words

An anchor for use in friable material comprising a generally hollow cylindrical body with a flanged end and a driling end, said body having an exterior thread disposed thereon, said drilling end including notch means formed in said drilling end adjacent said body for allowing passage of an elongated fastener through and beyond said drilling end, said notch means creating a section of reduced cross-sectional area in said drilling end to reduce resistance of said drilling end to bending.

Claim 2

Dependent Claim 79 words

An anchor for use in friable material comprising a generally hollow cylindrical body with a flanged end and a driling end, said body having an exterior thread disposed thereon, said drilling end including notch means formed in said drilling end adjacent said body for allowing passage of an elongated fastener through and beyond said drilling end, said notch means creating a section of reduced cross-sectional area in said drilling end to reduce resistance of said drilling end to bending.

Claim 3

Dependent Claim 44 words

An anchor according to claim 1 wherein said drilling end includes a generally flat pointed extension of said body, said drilling end including means for engaging a fastener and for causing said drilling end to deflect upon advancement of said fastener through said body.

Claim 4

Dependent Claim 15 words

An anchor according to claim 1 wherein said flanged end includes a phillips-type drive recess.

Claim 5

Dependent Claim 17 words

An anchor according to claim 3 wherein said recess is axially spaced inwardly of said flanged end.

Claim 6

Dependent Claim 21 words

An anchor according to claim 1 wherein said body includes a generally cylindrical bore adapted to receive a threaded elongated fastener.

Claim 7

Dependent Claim 17 words

An anchor according to claim 5 wherein said bore has a surface interrupted by axially oriented teeth.

Claim 8

Dependent Claim 28 words

An anchor according to claim 1 wherein said thread is spaced from said flanged end along said body by an amount less than one pitch of said thread.

Claim 9

Dependent Claim 36 words

An anchor according to claim 1 wherein said drilling end has an axial length generally equal to that of said body, whereby drilling of said material is substantially completed prior to engagement of said thread therewith.

Claim 10

Dependent Claim 25 words

An anchor according to claim 1 wherein said thread includes at least one interruption having a generally radial flat for performing a thread cutting operation.

Claim 11

Dependent Claim 86 words

An anchor for use in friable material comprising a generally hollow cylindrical body having a central bore and an exterior threaded portion having a predetermined axial length, a drill tip at one end of said body and a flange at the other end thereof, said drill tip comprising a generally flat pointed extension of said body, said tip including a spoon-like indentation communicating with said bore, said drill tip having an axial length generally equal to the axial length of the threaded portion of said body.

Claim 12

Dependent Claim 86 words

An anchor for use in friable material comprising a generally hollow cylindrical body having a central bore and an exterior threaded portion having a predetermined axial length, a drill tip at one end of said body and a flange at the other end thereof, said drill tip comprising a generally flat pointed extension of said body, said tip including a spoon-like indentation communicating with said bore, said drill tip having an axial length generally equal to the axial length of the threaded portion of said body.

Claim 13

Dependent Claim 32 words

An anchor according to claim 10 wherein said threaded portion of said body has a root and crest diameter such that the crest diameter is generally twice that of the root diameter.

Claim 14

Dependent Claim 27 words

An anchor according to claim 10 wherein said tip includes a weakened section near said threaded portion to facilitate passage of an elongated fastener through said anchor.

Claim 15

Dependent Claim 19 words

An anchor according to claim 10 wherein said drill tip includes a generally conical point having a flattened side.

Claim 16

Dependent Claim 31 words

An anchor according to claim 13 wherein said flattened side forms a frangible wall substantially closing off said bore at said drill tip said wall being penetrable by an elongated fastener.

Claim 17

Dependent Claim 169 words

An anchor for use in friable material comprising a generally cylindrical body with a flanged end and a drilling end, said flanged end having torque transmitting surfaces therein, an external thread on a portion of said body, said portion having a crest diameter generally twice its root diameter, and said portion having a predetermined axial length, a drill tip depending from said body having an axial length generally equal to the length of said threaded portion, said tip comprising a generally flat blade having an opening at one end thereof communicating with said bore, said blade having a maximum lateral dimension generally equal to said root diameter, said blade having a free end including three spikes, one of said spikes being centrally located with respect to the axis of said body, the other of said spikes having points spaced at a distance generally equal to said root diameter, the centrally located spike being further from said body than said other spikes, said blade being frangibly connected to said body.

Claim 18

Dependent Claim 169 words

An anchor for use in friable material comprising a generally cylindrical body with a flanged end and a drilling end, said flanged end having torque transmitting surfaces therein, an external thread on a portion of said body, said portion having a crest diameter generally twice its root diameter, and said portion having a predetermined axial length, a drill tip depending from said body having an axial length generally equal to the length of said threaded portion, said tip comprising a generally flat blade having an opening at one end thereof communicating with said bore, said blade having a maximum lateral dimension generally equal to said root diameter, said blade having a free end including three spikes, one of said spikes being centrally located with respect to the axis of said body, the other of said spikes having points spaced at a distance generally equal to said root diameter, the centrally located spike being further from said body than said other spikes, said blade being frangibly connected to said body.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1989-07-21	1990-01-20	1990-07-22	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	1993-07-21	1994-01-20	1994-07-22	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	1997-07-21	1998-01-20	1998-07-22	$7700.00	Window Closed / Lapsed

Self drilling threaded insert for drywall

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag