US4086840A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hollow wall fastener
Assignee: Individual
•
Filing: 1977-01-24
•
Granted: 1978-05-02
•
Expires: 1997-01-24
Abstract
Abstract A hollow wall fastener comprises a conical member composed of an elastomeric material adapted to collapse when compressed longitudinally. A threaded nut is molded and secured to an apex end of the member to form an integral part thereof and a bolt is threaded in the nut. The member and nut are suitably sized and constructed to be inserted through a hole formed through a wall whereby upon rotation of the bolt the member will be drawn into bearing contact with the blind side of the wall. Alternative embodiments include the addition of an elastomeric sleeve on the bolt, the formation of one or more radial lips internally and/or externally on the member, the addition of longitudinally extending ribs on the member and the formation of two or more conically shaped portions on the member, disposed in tandem relationship relative to each other.
Inventors
- 👤 Robert A. Kurlander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 18:44
CPC Classifications
F; F16; F16B; F16B13/00; F16B13/04; F16B13/06; F16B29/00; Y; Y10; Y10S; Y10S411/00; Y10S411/913
Claims Analysis
Total Claims: 23
Claim 1
Independent Claim
128 words
A blind wall fastener adapted for insertion through a hole formed through a wall comprising a hollow conical member composed of an elastomeric material and having thin sidewall portions of substantially uniform thickness throughout axial lengths thereof and collapsible along a longitudinal axis of said member, an internally threaded nut secured to an apex end of said member which terminates at said sidewall portions, said sidewall portions collapsible to assume an outside diameter no larger than the outside diameter of the apex end of said member, and a threaded member threadably mounted in said nut whereby upon insertion of said blind wall fastener through the hole formed through said wall, the sidewall portions of said member will expand radially outwardly automatically to engage a backside of said wall.
Claim 2
Dependent Claim
128 words
A blind wall fastener adapted for insertion through a hole formed through a wall comprising a hollow conical member composed of an elastomeric material and having thin sidewall portions of substantially uniform thickness throughout axial lengths thereof and collapsible along a longitudinal axis of said member, an internally threaded nut secured to an apex end of said member which terminates at said sidewall portions, said sidewall portions collapsible to assume an outside diameter no larger than the outside diameter of the apex end of said member, and a threaded member threadably mounted in said nut whereby upon insertion of said blind wall fastener through the hole formed through said wall, the sidewall portions of said member will expand radially outwardly automatically to engage a backside of said wall.
Claim 3
Dependent Claim
20 words
The fastener of claim 1 wherein sidewall portions of said conical member have substantially uniform thicknesses throughout axial lengths thereof.
Claim 4
Dependent Claim
18 words
The fastener of claim 1 wherein the apex end of said conical member is at least generally cylindrical.
Claim 5
Dependent Claim
23 words
The fastener of claim 3 wherein sidewall portions at the apex end of said member substantially encapsulate said nut and are secured thereto.
Claim 6
Dependent Claim
30 words
The fastener of claim 1 wherein the included angle between a base end and sidewall portions of said conical member is selected from the range of from 65° to 83°.
Claim 7
Dependent Claim
27 words
The fastener of claim 1 wherein the included cone angle between sidewall portions of said conical member is selected from the range of from 14° to 50°.
Claim 8
Dependent Claim
37 words
The fastener of claim 1 wherein the ratio of the diameter of a cylindrical base end of said conical member to the diameter of the apex thereof is selected from the range of from 1.25 to 4.25.
Claim 9
Dependent Claim
34 words
The fastener of claim 1 wherein the ratio of the length of said conical member to the diameter of a cylindrical base end thereof is selected from the range of from 0.5 to 1.5.
Claim 10
Dependent Claim
32 words
The fastener of claim 1 wherein the thickness of sidewall portions of said conical member is selected from the range of from one-thirty second of an inch to one-eighth of an inch.
Claim 11
Dependent Claim
23 words
The fastener of claim 1 wherein said nut is cylindrical and wherein an apex end of said conical member substantially encapsulates said nut.
Claim 12
Dependent Claim
37 words
The fastener of claim 10 wherein the apex end of said conical member comprises a pair of longitudinally spaced flanges extending radially inwardly from sidewall portions of said conical member and straddling opposite sides of said nut.
Claim 13
Dependent Claim
13 words
The fastener of claim 10 wherein said nut has threads formed externally thereon.
Claim 14
Dependent Claim
33 words
The fastener of claim 1 wherein the elastomeric material composing said conical member is selected from the group consisting of prevulcanized natural rubber latex, vulcanizable neoprene based compounds, natural gum and synthetic plastics.
Claim 15
Dependent Claim
38 words
The fastener of claim 1 further comprising an elastomeric sleeve mounted on a shank of said threaded member and having an axial length less than the axial length of said conical member and disposed within the confines thereof.
Claim 16
Dependent Claim
22 words
The fastener of claim 1 further comprising at least one circumferential lip formed integrally with said conical member to extend radially therefrom.
Claim 17
Dependent Claim
20 words
The fastener of claim 14 wherein said lip is formed internally of said conical member to extend radially inwardly therefrom.
Claim 18
Dependent Claim
22 words
The fastener of claim 15 wherein said lip is formed on a base of said conical member to extend radially outwardly therefrom.
Claim 19
Dependent Claim
22 words
The fastener of claim 1 further comprising a plurality of circumferentially disposed ribs formed on said conical member to extend longitudinally thereon.
Claim 20
Dependent Claim
15 words
The fastener of claim 18 wherein said ribs are formed internally on said conical member.
Claim 21
Dependent Claim
30 words
The fastener of claim 1 further comprising a second conical member having its apex end secured to a base end of said first-mentioned conical member and disposed in tandem therewith.
Claim 22
Dependent Claim
17 words
The fastener of claim 1 wherein said threaded member constitutes a bolt having a head formed thereon.
Claim 23
Dependent Claim
29 words
The fastener of claim 21 further comprising an annular washer on a shank of said bolt and having an outside diameter larger than the outside diameter of said head.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-05-01 | 1981-10-31 | 1982-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-05-01 | 1985-10-31 | 1986-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-05-01 | 1989-10-31 | 1990-05-02 | $7700.00 | Window Closed / Lapsed |