Patent US3556247A successfully refreshed from Google Patents.
US3556247A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Lift truck
Assignee: Toyota Industries Corp
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Filing: 1968-10-30
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Granted: 1971-01-19
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Expires: 1988-10-30
Abstract
Abstract A load-lifting apparatus comprising a base, a pair of stationary uprights, a pair of extensible uprights, a load carriage and pairs of upper, middle and lower guide rollers positioned between said uprights and/or between said uprights and said load carriage, said upper and lower rollers cooperating with their respective uprights to resist the forward thrust caused by the load, said middle and lower rollers cooperating with their respective uprights to resist the side thrust caused by eccentric loading.
Inventors
- 👤 Akibumi Shinoda
- 👤 Goro Nishi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 19:08
CPC Classifications
B; B66; B66F; B66F9/00; B66F9/06; B66F9/075; B66F9/08
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
267 words
A load-lifting apparatus comprising a base; a pair of laterally spaced-apart uprights being braced together by a lateral beam at their back surfaces and mounted on said base; a movable member adapted for longitudinal movement with respect to said uprights for lifting the load; and pairs of upper rollers, middle rollers and lower rollers positioned between said uprights and movable member and supported by said movable member for guiding the movement of said movable member, each of said uprights having a web, forward and rearward flanges extending inwardly from said web, a curved surface formed in the inside corner defined by said rearward flange and said web, and a supporting surface formed in continuation of said curved surface on a portion of the inner surface of said web, one of each of said upper, middle and lower pairs of rollers being disposed between the forward and rearward flange of each of said uprights, all of said rollers being rotatable in substantially parallel planes, said pair of upper rollers being in contact with said forward flanges, each of said middle rollers having a side face adapted to engage the adjacent supporting surface in response to an eccentric load, said lower rollers engaging said rearward flanges, curved surfaces and supporting surfaces, whereby said upper and lower rollers cooperate to resist the forward thrust of said load, and one of said lower rollers engaging one of said uprights cooperates with one of said middle rollers engaging the other of said uprights to resist the side thrust and substantially eliminating twisting moment applied to the uprights resulting from an eccentric load.
Claim 2
Dependent Claim
267 words
A load-lifting apparatus comprising a base; a pair of laterally spaced-apart uprights being braced together by a lateral beam at their back surfaces and mounted on said base; a movable member adapted for longitudinal movement with respect to said uprights for lifting the load; and pairs of upper rollers, middle rollers and lower rollers positioned between said uprights and movable member and supported by said movable member for guiding the movement of said movable member, each of said uprights having a web, forward and rearward flanges extending inwardly from said web, a curved surface formed in the inside corner defined by said rearward flange and said web, and a supporting surface formed in continuation of said curved surface on a portion of the inner surface of said web, one of each of said upper, middle and lower pairs of rollers being disposed between the forward and rearward flange of each of said uprights, all of said rollers being rotatable in substantially parallel planes, said pair of upper rollers being in contact with said forward flanges, each of said middle rollers having a side face adapted to engage the adjacent supporting surface in response to an eccentric load, said lower rollers engaging said rearward flanges, curved surfaces and supporting surfaces, whereby said upper and lower rollers cooperate to resist the forward thrust of said load, and one of said lower rollers engaging one of said uprights cooperates with one of said middle rollers engaging the other of said uprights to resist the side thrust and substantially eliminating twisting moment applied to the uprights resulting from an eccentric load.
Claim 3
Dependent Claim
38 words
A load-lifting apparatus as recited in claim 1 wherein the portion of said webs between said supporting surface and said forward flange is recessed away from said rollers to decrease contact resistance between said rollers and said uprights.
Claim 4
Dependent Claim
49 words
A load-lifting apparatus as recited in claim 2 wherein said uprights are stationary with respect to said base, said movable member being a load carriage mounted for longitudinal movement with respect to said stationary uprights for lifting load, said rollers being positioned between said uprights and said load carriage.
Claim 5
Dependent Claim
52 words
A load-lifting apparatus as recited iN claim 2 wherein said uprights are stationary with respect to said base, said movable member including a pair of laterally spaced extensible uprights longitudinally movable with respect to said stationary uprights for lifting load, said rollers being positioned between said stationary uprights and said extensible uprights.
Claim 6
Dependent Claim
52 words
A load-lifting apparatus as recited in claim 2 wherein said uprights are longitudinally extensible with respect to said base, said movable member including a load carriage mounted on said extensible uprights and longitudinally movable with respect thereto for lifting load, said rollers being positioned between said extensible uprights and said load carriage.
Claim 7
Dependent Claim
227 words
A load-lifting apparatus as recited in claim 2 wherein said uprights are stationary with respect to said base, said movable member including a pair of laterally spaced extensible uprights longitudinally movable with respect to said stationary uprights, a load carriage mounted on said extensible uprights for longitudinal movement with respect thereto for lifting load, and a second set of rollers including pairs of upper, middle and lower rollers positioned between said extensible uprights and said load carriage, said first-mentioned rollers being positioned between said stationary uprights and said extensible uprights, each of said extensible uprights having a web, forward and rearward flanges extending inwardly from said web, a curved surface formed in the inside corner defined by said rearward flange and web, and a supporting surface formed in continuation of said curved surface on a portion of the inner surface of said web, all of said second set of rollers being rotatable in substantially parallel planes, said second pair of upper rollers engaging said extensible upright forward flanges, each of said second pair of middle rollers having a side face engageable with the adjacent extensible upright supporting surfaces, said second pair of lower rollers engaging said extensible upright rearward flanges and curved and supporting surface, the portion of said extensible upright webs extending between said supporting surface and said forward flange being recessed away from said rollers.
Claim 8
Dependent Claim
76 words
A load-lifting apparatus as recited in claim 2, wherein said upright curved and supporting surfaces extend downwardly only from a point a predetermined distance from the top of said uprights, said middle rollers engaging said forward flanges when said upper rollers project above the upper end of said uprights, whereby said middle and lower rollers cooperate to resist the forward thrust of said load when said upper rollers project above the upper end of said uprights.
Claim 9
Dependent Claim
147 words
A load-lifting apparatus as recited in claim 7, wherein each of said uprights is formed with a second supporting surface adjacent said forward flange, the portion of said webs extending between said second supporting surface and said rearward flange being recessed away from said rollers, said second supporting surfaces extending upwardly substantially from said point located at a predetermined length from the top of said uprights, each of said middle rollers having a side face adapted to engage the adjacent second supporting surface in response to an eccentric load when said upper rollers project above the upper end of said uprights, whereby one of said lower rollers engaging one of said uprights cooperates with one of said middle rollers engaging the other of said uprights to resist the side thrust resulting from an eccentric load when said upper rollers project above the upper end of said uprights.
Claim 10
Dependent Claim
42 words
A load-lifting apparatus as recited in claim 8, each of said uprights having a second curved surface formed in the inside corner defined by said forward flange and web, said second supporting surface being formed in continuation of said second curved surface.
Claim 11
Dependent Claim
42 words
A load-lifting apparatus as recited in claim 8, wherein said first-mentioned supporting surface extends from said web towards said rollers a greater distance than said secoNd supporting surface whereby contact with both of said supporting surfaces by said middle rollers is minimized.
Claim 12
Dependent Claim
160 words
A load-lifting apparatus as recited in claim 1, wherein said curved and supporting surfaces extend downwardly along said uprights only from a point a predetermined length from the top of said uprights, each of said uprights having a second supporting surface formed on a portion of the inner surface of said web adjacent said forward flange, said first-mentioned supporting surface projecting from said web toward said rollers a distance greater than said second supporting surface, the portions of said web aside from the portions having said first-mentioned and second supporting surfaces thereon being recessed away from said rollers, each of said middle rollers being engageable against said forward flange and second supporting surface of its respective upright when said upper rollers project from the upper end of said uprights, whereby said middle rollers cooperate with said lower rollers to resist the forward and lateral thrust of said load when said upper rollers project from the upper end of said uprights.
References Cited (Backward Citations)
US3358791A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-01-18 | 1974-07-20 | 1975-01-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-18 | 1978-07-20 | 1979-01-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-18 | 1982-07-20 | 1983-01-19 | $7700.00 | Window Closed / Lapsed |