US4821543A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Double ended key ring
Assignee: G PRUEFER Manufacturing Co PO BOX 7241 1669 HARTFORD AVE JOHNSTON RI 02919 A CORP OF RI
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Filing: 1988-06-20
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Granted: 1989-04-18
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Expires: 2008-06-20
Abstract
Abstract The present invention provides a double ended key ring that includes a pair of key holders for retaining a set of keys. The key holders are movably connected to a central housing and are biased to retract into a pair of seats located at the ends of the housing to prevent the removal of the keys from the key holders. When the key holders are pulled away from the housing, the keys may then be removed from the key holders. The biasing mechanism for the key holders is located entirely within the housing. To this end the housing includes a central passageway that has a narrow bore, at one end, to preferably slidably receive a spring loaded lock pin that projects through the bore and is connected to one of the key holders. In order to permit the spring loaded lock pin and key holder to be assembled, the other end of the bore remains open until closed by a bushing. The bushing includes a tubular sidewall and an endwall having another narrow bore. Another spring loaded lock pin is slidably extended through the bore of the endwall and is connected to the other of key holders, preferably as a subassembly. The bushing is then connected within the other end of the passageway by a force fit.
Inventors
- 👤 Robert Scungio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:26
CPC Classifications
A; A44; A44B; A44B15/00; F; F16; F16B; F16B45/00; F16B45/04; F16B45/049; Y; Y10; Y10S; Y10S24/00; Y10S24/30; Y10S24/31; Y10S24/33; Y10S24/34; Y10T; Y10T24/00; Y10T24/13; Y10T24/1379; Y10T24/34; Y10T24/3484; Y10T24/3485; Y10T24/3487; Y10T24/45; Y10T24/45005; Y10T24/45099; Y10T70/00; Y10T70/80; Y10T70/8432; Y10T70/8676
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
302 words
A double ended key ring comprising; a pair of opposed, spaced key holders, each of which comprises retaining means, configured to pass through the retaining holes of keys, for retaining the keys, said retaining means having a gap for removing the keys from and for mounting the keys on said retaining means; a central housing including, a pair of opposed seats, located at the ends of said housing, having a pair of opposed, spaced abutment surfaces configured to contact said key holders and keeper means, connected to said abutment surfaces, for preventing the keys from being removed through said gaps of said retaining means when said key holders are in contact with said abutment surfaces, and a central passageway, communicating between said abutment surfaces, said passageway including, at one end, a shoulder having an inner facing surface, and a primary bore communicating between one of said abutment surfaces and said inner facing surface; said key holders being located at the ends of said housing and being operable for independent outward and inward movement between a retracted position, against said abutment surfaces and an extended position, spaced from said abutment surfaces, in which said gaps are exposed to permit the keys to be mounted on and to be removed from said retaining means; a cartridge-like bushing, located within the other end of said passageway, said bushing including a tubular sidewall and an endwall connected to said sidewall, said endwall having an opening; bushing attachment means for attaching said bushing to said housing; biasing means, locateed within said passageway, for biasing said key holders in their said retracted position; and connection means, configured to slidably extend through said primary bore and said opening of said endwall, for connecting said key holders to said biasing means for movement between their said extended and retracted positions.
Claim 2
Dependent Claim
302 words
A double ended key ring comprising; a pair of opposed, spaced key holders, each of which comprises retaining means, configured to pass through the retaining holes of keys, for retaining the keys, said retaining means having a gap for removing the keys from and for mounting the keys on said retaining means; a central housing including, a pair of opposed seats, located at the ends of said housing, having a pair of opposed, spaced abutment surfaces configured to contact said key holders and keeper means, connected to said abutment surfaces, for preventing the keys from being removed through said gaps of said retaining means when said key holders are in contact with said abutment surfaces, and a central passageway, communicating between said abutment surfaces, said passageway including, at one end, a shoulder having an inner facing surface, and a primary bore communicating between one of said abutment surfaces and said inner facing surface; said key holders being located at the ends of said housing and being operable for independent outward and inward movement between a retracted position, against said abutment surfaces and an extended position, spaced from said abutment surfaces, in which said gaps are exposed to permit the keys to be mounted on and to be removed from said retaining means; a cartridge-like bushing, located within the other end of said passageway, said bushing including a tubular sidewall and an endwall connected to said sidewall, said endwall having an opening; bushing attachment means for attaching said bushing to said housing; biasing means, locateed within said passageway, for biasing said key holders in their said retracted position; and connection means, configured to slidably extend through said primary bore and said opening of said endwall, for connecting said key holders to said biasing means for movement between their said extended and retracted positions.
Claim 3
Dependent Claim
31 words
The double ended key ring of claim 1 wherein, said bushing attachment means comprises said sidewall sized, relative to said passageway, to engage within said passageway in a force fitting connection.
Claim 4
Dependent Claim
26 words
The double ended key ring of claim 2 wherein the outer surface of said sidewall is knurled to resist rotation of said bushing within said passageway.
Claim 5
Dependent Claim
143 words
The double ended key ring of claim 1 wherein: said connection means include, a pair of first and second lock pins, respectively projecting, at one end, from said primary bore and said opening, each of said first and second lock pins having an enlarged head at its other end and key holder attachment means for attaching its said one projecting end to said key holders; and said biasing means includes a pair of first and second biasing springs, respectively bearing, at one end, against said inner facing surface and said endwall with said first lock pin extending through the coils of said first biasing spring, said second lock pin extending through the coils of said second biasing spring, and the said heads of said first and second lock pins bearing against the other of the ends of said first and second biasing springs.
Claim 6
Dependent Claim
102 words
The double ended key ring of claim 4 wherein said central passageway further includes: a contiguous secondary bore, extending from said primary bore, said secondary bore having a diameter greater than said primary bore to define said shoulder at the juncture of said bores and to center said first biasing spring relative to said first lock pin; a tertiary bore, coaxially spaced from, and having a greater diameter than, said secondary bore, said tertiary bore defining said other end of said central passageway; and a transitionary bore having a frustro-conical configuration, said transitionary bore, communicating between said secondary and said tertiary bores.
Claim 7
Dependent Claim
91 words
The double ended key ring of claim 4 wherein: said housing has a pair of inwardly directed grooves defined at the ends of said housing to form said seats; said abutment surfaces have an arcuate configuration and form the bottom of said grooves; said grooves are configured to partially receive said key holders and enclose said gaps to form said keeper means; and said retaining means, for each of said key holders, comprises a substantially closed circular, ring-like element, said element being sized to extend through the retaining holes of keys.
Claim 8
Dependent Claim
70 words
The double ended key ring of claim 6 wherein: said one key holder has a smaller diameter than said other key holder; said first biasing spring has a length that is less than the length of said second biasing spring to provide less of a biasing force to said one key holder; and said first lock pin has a length that is less than that of said second lock pin.
Claim 9
Dependent Claim
52 words
The double ended key ring of claim 6 wherein the combined lengths of said first and second lock pins are greater than the length of said central passageway so that said heads of said first and second lock pins contact one another when said key holders are in their said retracted position.
Claim 10
Dependent Claim
63 words
The double ended key ring of claim 6 wherein said key holder attachment means comprises: each of said elements, forming said retaining means, having a hole communicating between its inner and its outer peripheries; and said one projecting ends of said first and second lock pins extending through said holes of said elements and being peened at the inner peripheries of said elements.
Claim 11
Dependent Claim
81 words
The double ended key ring of claim 6 wherein: said housing has a configuration including a pair of opposed spaced, major surfaces and a set of lateral surfaces connecting said major surfaces; said grooves define a pair of rectangular slot-like openings located in the ends of said housing; and said key holders, when in their said extended position, are operable to be rotated, individually, through an angle of 90 degrees and thereafter rest upon the lengthwise edges of said slot-like openings.
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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) | 1992-04-17 | 1992-10-17 | 1993-04-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-04-17 | 1996-10-17 | 1997-04-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2000-04-17 | 2000-10-17 | 2001-04-18 | $7700.00 | Window Closed / Lapsed |