Patent US4579492A successfully refreshed from Google Patents.
US4579492A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Plastic screw anchor
Assignee: Aoyama Seisakusho Co Ltd
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Filing: 1983-07-27
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Granted: 1986-04-01
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Expires: 2003-07-27
Abstract
Abstract A plastic screw anchor having legs each formed with a recess which provides the leg with good flexibility whereby the legs can easily deform during the insertion thereof into an aperture of a supporting plate and also provides a strong grip between the screw anchor and the supporting plate. A wing integrally formed on each leg prevents the screw anchor from coming out of the aperture after having once been inserted therein.
Inventors
- 👤 Hiroshi Kazino
- 👤 Masaaki Ide
- 👤 Tomiyasu Kakeno
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:33
CPC Classifications
F; F16; F16B; F16B21/00; F16B21/06; F16B21/07; F16B21/076; F16B21/08; F16B21/086; F16B37/00; F16B37/04; F16B37/041; F16B37/043; F16B5/00; F16B5/06; F16B5/0607; F16B5/0621; F16B5/065
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
181 words
A combination of a plastic screw anchor and a supporting plate to which the anchor is secured comprising: said plastic screw anchor including a head having a top surface and an under surface; oppositely arranged legs extending downward from said under surface of the head; a center bore formed through the head and the legs for receiving a self-tapping screw; an arched groove formed between the legs; the legs each having a recess extending laterally from the external surface of the legs and a wing extending upward and gradually outward from the bottom of the leg; and a neck portion formed between the under surface and the recess; said supporting plate including an aperture through which the plastic screw anchor is fitted; said head of the plastic screw anchor is adapted to be sandwiched between the supporting plate and a structural element attached at the top surface of the head when the self-tapping screw is threaded into the center bore; and, the neck portion of the plastic screw anchor includes a longitudinal height greater than the thickness of the supporting plate.
Claim 2
Dependent Claim
181 words
A combination of a plastic screw anchor and a supporting plate to which the anchor is secured comprising: said plastic screw anchor including a head having a top surface and an under surface; oppositely arranged legs extending downward from said under surface of the head; a center bore formed through the head and the legs for receiving a self-tapping screw; an arched groove formed between the legs; the legs each having a recess extending laterally from the external surface of the legs and a wing extending upward and gradually outward from the bottom of the leg; and a neck portion formed between the under surface and the recess; said supporting plate including an aperture through which the plastic screw anchor is fitted; said head of the plastic screw anchor is adapted to be sandwiched between the supporting plate and a structural element attached at the top surface of the head when the self-tapping screw is threaded into the center bore; and, the neck portion of the plastic screw anchor includes a longitudinal height greater than the thickness of the supporting plate.
Claim 3
Dependent Claim
178 words
A combination of a screw anchor and a supporting plate to which the anchor is secured comprising: said screw anchor including a head having a top surface and an under surface; oppositely arranged legs extending downward from said under surface of said head; a center bore formed through said head and said legs for receiving a self-tapping screw; an arched groove formed between said depending legs; a supporting plate; said head being adapted to be sandwiched between said supporting plate to which said screw anchor is fitted at the under surface of said head and a structural element attached at the top surface of said head to be secured to said supporting plate; said legs each include a recess extending laterally from the external surface of said legs and a wing extending upward and gradually outward from the bottom of said leg; and a neck portion formed between said under surface and said recess wherein said neck portion has a longitudinal height greater than the thickness of said supporting plate and said wing extends toward said neck portion.
Claim 4
Dependent Claim
178 words
A combination of a screw anchor and a supporting plate to which the anchor is secured comprising: said screw anchor including a head having a top surface and an under surface; oppositely arranged legs extending downward from said under surface of said head; a center bore formed through said head and said legs for receiving a self-tapping screw; an arched groove formed between said depending legs; a supporting plate; said head being adapted to be sandwiched between said supporting plate to which said screw anchor is fitted at the under surface of said head and a structural element attached at the top surface of said head to be secured to said supporting plate; said legs each include a recess extending laterally from the external surface of said legs and a wing extending upward and gradually outward from the bottom of said leg; and a neck portion formed between said under surface and said recess wherein said neck portion has a longitudinal height greater than the thickness of said supporting plate and said wing extends toward said neck portion.
Claim 5
Dependent Claim
18 words
The combination of claim 2 in which the top of the wing somewhat laterally projects from the neck.
Claim 6
Dependent Claim
13 words
The combination of claim 2 in which the anchor is made of nylon-6.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-03-31 | 1989-09-30 | 1990-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-03-31 | 1993-09-30 | 1994-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-03-31 | 1997-09-30 | 1998-04-01 | $7700.00 | Window Closed / Lapsed |