IPC분류정보
국가/구분 |
United States(US) Patent
등록
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국제특허분류(IPC7판) |
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출원번호 |
US-0147115
(2002-05-16)
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발명자
/ 주소 |
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출원인 / 주소 |
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대리인 / 주소 |
Patterson, Thuente, Skaar &
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인용정보 |
피인용 횟수 :
1 인용 특허 :
37 |
초록
▼
A convertible ladder including a first ladder portion, a second ladder portion and a static hinge mechanism. The first ladder portion has a first locking mechanism proximate a first end thereof. The second ladder portion has a second locking mechanism proximate a first end thereof. The static hinge
A convertible ladder including a first ladder portion, a second ladder portion and a static hinge mechanism. The first ladder portion has a first locking mechanism proximate a first end thereof. The second ladder portion has a second locking mechanism proximate a first end thereof. The static hinge mechanism is attached to the first ladder portion with the first locking mechanism. The static hinge mechanism is attached to the second ladder portion with the second locking mechanism. The static hinge mechanism maintains the first ladder portion in a stationary relation with respect to the second ladder portion.
대표청구항
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1. A convertible ladder comprising:a first ladder portion comprising a first rail, a second rail and a plurality of rungs that extend between the first rail and the second rail, wherein the first rail and the second rail are each channel shaped and have a first pair of legs joined by a first main se
1. A convertible ladder comprising:a first ladder portion comprising a first rail, a second rail and a plurality of rungs that extend between the first rail and the second rail, wherein the first rail and the second rail are each channel shaped and have a first pair of legs joined by a first main section; and wherein the first pair of legs and the first main section define a first rail recess; a second ladder portion comprising a third rail, a fourth rail and a plurality of rungs that extend between the third rail and the fourth rail, wherein the third rail and the fourth rail are each channel shaped and have a second pair of legs joined by a second main section, and wherein the second pair of legs and the second main section define a second rail recess; a first non-adjustable hinge mechanism having a first end and a second end, wherein the first end and the second end each have a first hinge recess formed therein, and wherein the first hinge recesses receive the first main section on the first rail and the second main section on the third rail; a second non-adjustable hinge mechanism having a first end and a second end, wherein the first end and the second end each have a second hinge recess formed therein, and wherein the second hinge recesses receive the first main section on the second rail and the second main section on the fourth rail, wherein the first and second non-adjustable hinge mechanisms each have a first plate, a second plate and an intermediate plate mounted between the first plate and the second plate so that the intermediate plate is parallel to and adjacent to both the first plate and the second plate, said first and second plates extending beyond the intermediate plate and defining said recesses therebetween at each end thereof; and a plurality of locking mechanisms releasably attaching the first, second, third and fourth rails to the first and second non-adjustable hinge mechanisms, wherein the first non-adjustable hinge mechanism and the second non-adjustable hinge mechanism maintain the first ladder portion and the second ladder portion in a substantially stationary relationship with respect to each other, and wherein the first plate extends into the first rail recess and the second rail access, respectively, wherein each first plate, second plate and a respective main section having aligned apertures receiving one of the plurality of locking mechanisms. 2. The convertible ladder of claim 1, wherein this first and second non-adjustable hinge mechanisms are each U-shaped and have a pair of hinge legs.3. The convertible ladder of claim 2, wherein an angle between the hinge legs is between about 20 and 50 degrees.4. The convertible ladder of claim 1, wherein the plurality of locking mechanisms are each movable between an engaged position and a disengaged position.5. The convertible ladder of claim 4, wherein the plurality of locking mechanisms are each biased to the engaged position.6. A method of operating a convertible ladder comprising:providing a first ladder portion and a second ladder portion, wherein the first ladder portion and the second ladder portion each comprise a first rail, a second rail and a plurality of rungs that extend between the first rail and the second rail, wherein the first rail end the second rail each being channel shaped having a pair of legs joined by a main section, and wherein the pair of legs and the main section define a rail recess; providing a first non-adjustable hinge mechanism having a first end and a second end, wherein the first end and the second end each have a first hinge recess formed therein; providing a second non-adjustable hinge mechanism having a third end and a fourth end, wherein the third end and the fourth end each have a second hinge recess formed therein, wherein the first and second non-adjustable hinge mechanisms each have a first plate, a second plate and an intermediate plate mounted between the first plate and the second plate so that the intermediate plate is parallel to and adjacent to both the first plate and the second plate, said first and second plates extending beyond the intermediate plate and defining said recesses therebetween at each end thereof; and extending the main sections on the first rails into the first hinge recess in the first and second ends of the first non-adjustable hinge mechanism; extending the main sections on the second rails into the second hinge recess in the third and fourth ends of the second non-adjustable hinge mechanism; extending the first plate into the rail recesses on the legs of the first ladder portion and the second ladder portion; attaching the first rails to the first non-adjustable hinge mechanism with a first locking mechanism extending through aligned apertures respective first plates, second plates, and first main rail section; and attaching the second rails to the second non-adjustable hinge mechanism with a second locking mechanism extending through aligned apertures respective first plates, second plates, and second rails main section. 7. The method of claim 6, and further comprising:extending a portion of the first non-adjustable hinge mechanism into the rail recess on the first rails; and extending a portion of the second non-adjustable hinge mechanism into the rail recess on the second rails. 8. The method of claim 6, wherein the first and second non-adjustable hinge mechanisms are each U-shaped and have a pair of hinge legs, and wherein an angle between the hinge legs is between about 20 and 50 degrees.9. The method of claim 6, wherein the first and second locking mechanisms are each movable between an engaged position and a disengaged position.10. The method of claim 9, wherein the first and second locking mechanisms are each biased to the engaged position.11. A convertible ladder comprising:a first ladder portion comprising: a first rail defining a first rail recess; a second rail defining a second rail recess; a plurality of rungs extending between the first rail and the second rail; a first locking mechanism operably connected to the first ladder portion; and a second locking mechanism operably connected to the first ladder portion; a second ladder portion comprising: a third rail; a fourth rail; a plurality of rungs extending between the third rail and the fourth rail; a third locking mechanism operably connected to the second ladder portion; and a fourth locking mechanism operably connected to the second ladder portion; a first non-adjustable hinge mechanism releasably attached to the first rail with the first locking mechanism and to the third rail with the third locking mechanism; and a second non-adjustable hinge mechanism releasably attached to the second rail with the second looking mechanism and to the fourth rail with the fourth locking mechanism; wherein the first and second non-adjustable hinge mechanisms each have a first plate, a second plate and an intermediate plate mounted between the first plate and the second plate so that the intermediate plate is parallel to and adjacent to both the first plate and the second plate, and said first and second plates extending beyond the intermediate plates at both ends thereof and defining hinge recesses therebetween; and wherein each of the rails is received in a respective hinge recess, and each first and second plates and a respective rail having aligned apertures receiving a respective locking mechanism therethrough portions, respectively. 12. The convertible ladder of claim 11, wherein the first and second non-adjustable hinge mechanisms are each U-shaped and have a pair of hinge legs.13. The convertible ladder of claim 12, wherein an angle between the hinge legs is between about 20 and 50 degrees.14. The convertible ladder of claim 11, wherein the first and second locking mechanisms are each movable between an engaged position and a disengaged position.15. The convertible ladder of claim 14, wherein the first and second locking mechanisms are each biased to the engaged position.
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