Patent US3722154A successfully refreshed from Google Patents.
US3722154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extensible boom with buckling-prevention
Assignee: Individual
•
Filing: 1970-10-15
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Granted: 1973-03-27
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Expires: 1990-10-15
Abstract
Abstract In an extensible boom of the type having telescopically extensible boom members, a buckling-preventing method for hydraulic cylinder unit employed in the boom wherein an intermediate position of an optionally extended piston-rod of said cylinder unit is always supported with a buckling-preventing device having legs slidably or rotatably engaged with inner circumference of a boom member. The present invention further includes driving means for said buckling-preventing device which moves the device to said intermediate position of the piston-rod in connection with the operation of said cylinder unit.
Inventors
- 👤 T Sakamoto
- 👤 T Nishimura
- 👤 O Takarada
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 14:05
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/705
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
222 words
In an extensible boom of the type having at least one pair of telescopically extensible inner and outer boom members and at least one hydraulic power unit arranged between the ends of adjacent inner and outer boom members for producing relative movement between said boom members, said power unit including a hydraulic cylinder connected to one of said boom members, and a piston rod connected to the other of said boom members; bucklepreventing means for said piston rod, said buckle-preventing means comprising: a body portion slidably received on said piston-rod of said power unit, said body portion having outwardly extending means movably engaged with the inner circumference of the boom member to which the end of the piston is connected, and driving means for moving said body portion through said boom in response to the extending and contracting operation of said hydraulic cylinder unit, said driving means including means operably connecting said body portion to said adjacent boom members moving said body portion continuously during said extending and contracting operation as a function of the relative movement between said members and at a rate smaller than the extending and contracting rate of said hydraulic cylinder unit, whereby said body portion is substantially continuously maintained intermediate the end of said piston-rod connected to the other boom member and the end of said cylinder.
Claim 2
Dependent Claim
222 words
In an extensible boom of the type having at least one pair of telescopically extensible inner and outer boom members and at least one hydraulic power unit arranged between the ends of adjacent inner and outer boom members for producing relative movement between said boom members, said power unit including a hydraulic cylinder connected to one of said boom members, and a piston rod connected to the other of said boom members; bucklepreventing means for said piston rod, said buckle-preventing means comprising: a body portion slidably received on said piston-rod of said power unit, said body portion having outwardly extending means movably engaged with the inner circumference of the boom member to which the end of the piston is connected, and driving means for moving said body portion through said boom in response to the extending and contracting operation of said hydraulic cylinder unit, said driving means including means operably connecting said body portion to said adjacent boom members moving said body portion continuously during said extending and contracting operation as a function of the relative movement between said members and at a rate smaller than the extending and contracting rate of said hydraulic cylinder unit, whereby said body portion is substantially continuously maintained intermediate the end of said piston-rod connected to the other boom member and the end of said cylinder.
Claim 3
Dependent Claim
156 words
A device according to claim 1 wherein said driving means includes a first pulley mounted to said body portion and rope means fixed at one end to a suitable portion of a boom member carrying said cylinder, said rope means being trained over and around said pulley and fixed at its other end to one end of a boom member carrying said piston-rod, second and third pulleys mounted to opposite ends of said piston-rod carrying boom member, a fourth pulley mounted to said body portion, and second rope means fixed at one end to one end of said cylinder carrying boom member, said second rope means being trained over and around said second, third and fourth pulleys in such a manner that said latter rope means is turned at each of said latter three pulleys in a U-letter-shaPed manner, and is fixed at the other end to the other end of said piston-rod carrying boom member.
Claim 4
Dependent Claim
78 words
A device according to claim 1 wherein said driving means includes first rack means fixed within the boom member carrying said cylinder, second rack means fixed within the boom member carrying said piston-rod and in confronting relationship with said first rack means, and pinion means positioned between and in engagement with said rack means, said pinion means being connected to said body portion for moving the latter in response to the extending and contracting operation of said cylinder.
Claim 5
Dependent Claim
94 words
A device according to claim 3 wherein said first and second rack means includes a plurality of first racks provided around and mounted to the outer circumference of said cylinder, an equal plurality of second racks provided around and mounted to the inner circumference of said inner boom, each of said second racks being in confronting relationship with a corresponding one of said first racks, and an equal plurality of pinion means for supporting said cylinder, each of said pinion means being provided between and in engagement with a confronting pair of said racks.
Claim 6
Dependent Claim
48 words
A device according to claim 4 wherein said rack means is fixed at one end to its corresponding boom member and wherein said driving means further includes roller means supporting said last mentioned rack means for ensuring engagement between said pinion means and said last mentioned rack means.
Claim 7
Dependent Claim
47 words
A device according to claim 1 wherein said driving means includes a plurality of roller means connected to said body portion, said roller means being in rotatable engagement with relatively movable surfaces carried by said inner and outer boom members, respectfully, whereby to move said body portion.
Claim 8
Dependent Claim
51 words
A device according to claim 6 including a first elongated plate member positioned within and affixed to one of said boom members, a second elongated plate member positioned within and affixed to the adjacent boom member, said plate members providing said relatively movable surfaces for rotatable engagement with said roller means.
Claim 9
Dependent Claim
63 words
A device according to claim 7 wherein one of said plate members is fixed at one end to its corresponding boom member and wherein said driving means further includes second roller means mounted to the other boom member, said second roller means being positioned for rotatable engagement with said last mentioned plate member whereby to aid in supporting said last mentioned plate member.
Claim 10
Dependent Claim
71 words
A device according to claim 8 wherein one of said plate members is fixed at one end to its corresponding boom member and wherein said driving means further includes second roller means rotatably mounted to a bearing provided with said first roller means, said second roller means being in rotatable engagement with said last mentioned plate member for insuring engagement between said first roller means and said last mentioned plate member.
Claim 11
Dependent Claim
40 words
A device according to claim 9 wherein said roller means includes a first roller rotatably engaging both of said plate members, a second roller rotatably engaging said first plate member and a third roller rotatably engaging said second plate member.
Claim 12
Dependent Claim
60 words
A device according to claim 1 wherein said driving means includes drum means rotatably mounted to said body portion, a pair of rope means secured at common ends to said drum means and at opposite common ends to said adjacent boom members respectively and means for rotatably biasing said drum in a direction such that said ropes are wound thereupon.
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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) | 1976-03-26 | 1976-09-25 | 1977-03-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-26 | 1980-09-25 | 1981-03-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-26 | 1984-09-25 | 1985-03-27 | $7700.00 | Window Closed / Lapsed |