US3777796A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Screw rod with washer
Assignee: TAKANO SEIMITSU KOGYO CO
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Filing: 1971-11-18
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Granted: 1973-12-11
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Expires: 1991-11-18
Abstract
Abstract In a screw rod-washer assembly comprising a screw rod and a plain wahser fitted around the neck of said screw rod, the plain washer is secured to the neck of the screw rod by means of a plurality of projections formed at the inner peripheral edge of said plain washer and projecting close to the outer peripheral surface of said screw rod and, when said assembly further comprises a spring washer, said spring washer and said plain washer are integrally secured to each other by means of an upward annular projection projecting from the inner peripheral edge of the latter and received in the central hole of the former with the upper edge portion thereof bent radially outwardly in a manner to embrace the edge of the central hole of said spring washer, so that the screw rod-washer assemblies of the invention are adapted for mass production.
Inventors
- 👤 T Takano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 11:53
CPC Classifications
H; H01; H01R; H01R4/00; H01R4/28; H01R4/30; H01R4/34; F; F16; F16B; F16B39/00; F16B39/22; F16B39/24; Y; Y10; Y10S; Y10S411/00; Y10S411/955; Y10S411/956; Y10S411/96
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
394 words
A screw rod with washer, consisting of a screw rod and a washer, said screw rod having a threaded portion on one side up to its end on said side and a head at the other end which is slotted for receiving a screw driver and further having an unthreaded neck portion between said head and said threaded portion, said neck portion having a diameter substantially equal to the effective diameter of said threaded portion, said washer being a plate-like member without substantial curvature in vertical cross-section and having a surface wider than the lower surface of said head and having formed in the center thereof a punched hole of a diameter larger than the outer diameter of the threads of said threaded portion, and further said washer being rotatably mounted around said neck portion and having a plurality of projections spaced apart from each other and formed at the inner peripheral edge of said washer which projections project radially inwardly close to the peripheral surface of said neck portion to prevent said washer from moving off said neck portion, and wherein a sprng washer having a curved configuration in transverse cross-section is mounted around the neck portions of said screw rod between said plain washer and said head and secured to said plain washer, and a flange portion formed between the neck portion and the threaded portion of said screw rod and which extends perpendicularly to the axis of said screw rod and has a diameter substantially equal to the outer diameter of the threads of said threaded portion, and further the lead angle of the thread of the threaded portion adjoining said flange is reduced to about one/half oF that of the other threads so that the helices of the crest and root of said thread may lead to the lower surface of said flange, respectively, and wherein said plain washer is formed with an annular projection extending upwardly from the inner peripheral edge thereof, while said spring washer is formed centrally therein with a punched hole of a diameter larger than the diameter of the central hole of said plain washer, and said annular projection is received in the central hole of said spring washer and the upper end thereof is bent radially outwardly by caulking it, whereby said plain washer and said spring washer are integrally secured to each other.
Claim 2
Dependent Claim
394 words
A screw rod with washer, consisting of a screw rod and a washer, said screw rod having a threaded portion on one side up to its end on said side and a head at the other end which is slotted for receiving a screw driver and further having an unthreaded neck portion between said head and said threaded portion, said neck portion having a diameter substantially equal to the effective diameter of said threaded portion, said washer being a plate-like member without substantial curvature in vertical cross-section and having a surface wider than the lower surface of said head and having formed in the center thereof a punched hole of a diameter larger than the outer diameter of the threads of said threaded portion, and further said washer being rotatably mounted around said neck portion and having a plurality of projections spaced apart from each other and formed at the inner peripheral edge of said washer which projections project radially inwardly close to the peripheral surface of said neck portion to prevent said washer from moving off said neck portion, and wherein a sprng washer having a curved configuration in transverse cross-section is mounted around the neck portions of said screw rod between said plain washer and said head and secured to said plain washer, and a flange portion formed between the neck portion and the threaded portion of said screw rod and which extends perpendicularly to the axis of said screw rod and has a diameter substantially equal to the outer diameter of the threads of said threaded portion, and further the lead angle of the thread of the threaded portion adjoining said flange is reduced to about one/half oF that of the other threads so that the helices of the crest and root of said thread may lead to the lower surface of said flange, respectively, and wherein said plain washer is formed with an annular projection extending upwardly from the inner peripheral edge thereof, while said spring washer is formed centrally therein with a punched hole of a diameter larger than the diameter of the central hole of said plain washer, and said annular projection is received in the central hole of said spring washer and the upper end thereof is bent radially outwardly by caulking it, whereby said plain washer and said spring washer are integrally secured to each other.
Claim 3
Dependent Claim
53 words
A screw rod with washer according to claim 1, wherein the part of said neck portion adjoining said flange is reduced in diameter relative to the other portion of the same, such as to facilitate the formation of the flange to enable said flange to prevent the plain washer from contacting the threads.
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) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |