US3831771A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mobile crane with telescopic boom and jib and method for connecting the latter
Assignee: Harnischfeger Corp
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Filing: 1973-02-16
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Granted: 1974-08-27
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Expires: 1993-02-16
Abstract
Abstract A mobile crane comprises a multisection telescopic boom and an optionally usable multisection telescopic lattice type jib (having a base section and axially movable intermediate and fly sections) which when not in use is telescoped and stored on a support in parallel reverse disposition alongside the boom. Each jib section comprises four hollow tubular longitudinal members (each of rectangular cross-section) arranged in parallel spaced apart relationship with a plurality of angularly disposed tubular cross braces connected between each pair of members to define a jib section of rectangular cross section. Each longitudinal member is rotated on its axis to present opposite inwardly and outwardly facing flat bearing surfaces and also to present two other opposite flat surfaces to which the ends of the cross braces are welded. Bearing means are provided to facilitate relative sliding motion and to transmit thrust forces between adjacent jib sections. The bearing means comprises inwardly facing slide pads mounted at the lower front ends of the base and intermediate sections and outwardly facing slide pads mounted at the upper and lower rear ends of the intermediate and fly sections; each slide pad being mounted on a support secured within the hollow end of a tubular longitudinal member and engaged with an appropriate bearing surface on an adjacent jib section. To unstore the jib and set it up for use, the foot end of the jib is releasably connected by pivot pin means to the point end of the boom and the boom is partially extended to axially move the jib forward clear of its support. At this stage the unextended jib may be swung 180* about the pivot pin means into axial alignment with the boom and rigidly secured thereto by suitable attachment means. Or, the jib may be partially or fully extended prior to being swung 180* by connecting either the jib intermediate section or the jib fly section, respectively, by releasable rear pin means to the boom base section and by then further extending the boom, either partially or fully, respectively. In all cases, prior to swinging the jib, a guy wire jib mast pivotally attached to the boom point and folded back alongside the boom is swung into upright position. The jib is designed so that it can be rigidly connected at an angle to the boom axis and so that the jib fly section can be rigidly connected at an angle to the jib axis.
Inventors
- 👤 D Wiencek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:43
CPC Classifications
B; B66; B66C; B66C23/00; B66C23/62; B66C23/64; B66C23/70; B66C23/701; B66C23/707; B66C23/702
Claims Analysis
Total Claims: 29
Claim 1
Independent Claim
199 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and at least one other boom section telescopically movable with respect to said base section; means for telescopically moving said other boom section; a jib comprising at least one jib section; support means including roller means for supporting said jib in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means pivotally connecting the jib foot to the boom point, said first means enabling axial movement of said other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; and connecting means for releasably connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 2
Dependent Claim
199 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and at least one other boom section telescopically movable with respect to said base section; means for telescopically moving said other boom section; a jib comprising at least one jib section; support means including roller means for supporting said jib in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means pivotally connecting the jib foot to the boom point, said first means enabling axial movement of said other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; and connecting means for releasably connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 3
Dependent Claim
31 words
A crane according to claim 1 wherein said first means comprises at least one pin removably engageable with a pin hole on said jib and a pin hole on said boom.
Claim 4
Dependent Claim
40 words
A crane according to claim 2 wherein said pin is vertically disposed when said boom and jib are in stored position and wherein said jib is swingable horizontally about said pin when said jib is off of said support means.
Claim 5
Dependent Claim
31 words
A crane according to claim 3 wherein said connecting means comprises at least one pin removably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 6
Dependent Claim
30 words
A crane according to claim 4 including a jib mast pivotably mounted on said other boom section and pivotable between a stored position alongside said boom and an upright position.
Claim 7
Dependent Claim
284 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and at least one other boom section telescopically movable with respect to said boom base section; means for telescopically moving said other boom section; a telescopic jib comprising a jib base section and at least one other jib section telescopically movable with respect to said jib base section; support means including roller means for supporting said jib while telescoped in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means for pivotally connecting the jib foot end of said jib base section to the boom point end of said other boom section, said first means enabling axial movement of said other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; second means for releasably connecting said other jib section to a point on said crane which is fixed with respect to said other boom section, said second means enabling axial movement of said other boom section to effect axial telescopic movement of said jib base section with respect to said other jib section; and connecting means for releasAbly connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 8
Dependent Claim
284 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and at least one other boom section telescopically movable with respect to said boom base section; means for telescopically moving said other boom section; a telescopic jib comprising a jib base section and at least one other jib section telescopically movable with respect to said jib base section; support means including roller means for supporting said jib while telescoped in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means for pivotally connecting the jib foot end of said jib base section to the boom point end of said other boom section, said first means enabling axial movement of said other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; second means for releasably connecting said other jib section to a point on said crane which is fixed with respect to said other boom section, said second means enabling axial movement of said other boom section to effect axial telescopic movement of said jib base section with respect to said other jib section; and connecting means for releasAbly connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 9
Dependent Claim
31 words
A crane according to claim 6 wherein said first means comprises at least one pin removably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 10
Dependent Claim
40 words
A crane according to claim 7 wherein said pin is vertically disposed when said boom and jib are in stored position and wherein said jib is swingable horizontally about said pin when said jib is off of said support means.
Claim 11
Dependent Claim
31 words
A crane according to claim 8 wherein said second means comprises at least one pin releasably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 12
Dependent Claim
31 words
A crane according to claim 9 wherein said connecting means comprises at least one pin removably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 13
Dependent Claim
30 words
A crane according to claim 10 including a jib mast pivotably mounted on said other boom section and pivotable between a stored position alongside said boom and an upright position.
Claim 14
Dependent Claim
294 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and a plurality of other boom sections telescopically movable with respect to said boom base section; means for telescopically moving said other boom sections; a telescopic jib comprising a jib base section and a plurality of other jib sections telescopically movable with respect to said jib base section; support means including roller means for supporting said jib while telescoped in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means for pivotally c0nnecting the jib foot end of said jib base section to the boom point end of one of said other boom sections, said first means enabling axial movement of said one other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; second means for releasably connecting one of said other jib sections to a point on said crane which is fixed with respect to said other boom section, said second means enabling axial movement of at least one of said other boom sections to effect axial telescopic movement of said jib base section with respect to said one other jib section; and connecting means for releasably connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 15
Dependent Claim
294 words
In a mobile crane: a telescopic boom having a stored position and comprising a boom base section and a plurality of other boom sections telescopically movable with respect to said boom base section; means for telescopically moving said other boom sections; a telescopic jib comprising a jib base section and a plurality of other jib sections telescopically movable with respect to said jib base section; support means including roller means for supporting said jib while telescoped in stored position parallel to said boom when the latter is in stored position; said jib being reversely disposed with respect to said boom when both are in stored position; first means for pivotally c0nnecting the jib foot end of said jib base section to the boom point end of one of said other boom sections, said first means enabling axial movement of said one other boom section to effect axial movement of said jib onto and off of said roller means of said support means, said first means also enabling pivotal movement of said jib between one position wherein said jib is parallel to and reversely disposed with respect to said boom and another position wherein said jib is aligned with said boom, provided said jib is off of said roller means of said support means; second means for releasably connecting one of said other jib sections to a point on said crane which is fixed with respect to said other boom section, said second means enabling axial movement of at least one of said other boom sections to effect axial telescopic movement of said jib base section with respect to said one other jib section; and connecting means for releasably connecting said jib to said boom when said jib is pivoted into alignment with said boom.
Claim 16
Dependent Claim
30 words
A crane according to claim 12 wherein said point on said crane which is fixed with respect to said one other boom section is located on said boom base section.
Claim 17
Dependent Claim
31 words
A crane according to claim 13 wherein said first means comprises at least one pin removably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 18
Dependent Claim
40 words
A crane according to claim 14 wherein said pin is vertically disposed when said boom and jib are in stored position and wherein said jib is swingable horizontally about said pin when said jib is off of said support means.
Claim 19
Dependent Claim
31 words
A crane according to claim 15 wherein said second means comprises at least one pin releasably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 20
Dependent Claim
31 words
A crane according to claim 16 wherein said connecting means comprises at least one pin removably engageable with a pin hole on said boom and a pin hole on said jib.
Claim 21
Dependent Claim
30 words
A crane according to claim 17 including a jib mast pivotably mounted on said other boom section and pivotable between a stored position alongside said boom and an upright position.
Claim 22
Independent Claim
82 words
A method of employing a telescopic crane boom to handle a jib storable parallel to and in reverse disposition with respect to the boom on support means, comprising the steps of: releasably and piVotally connecting the foot end of said jib to the point of said boom; telescopically moving said boom to effect axial movement of said jib with respect to said support means; and pivoting said jib with respect to said boom while said jib is clear of said support means.
Claim 23
Independent Claim
82 words
A method of employing a telescopic crane boom to handle a jib storable parallel to and in reverse disposition with respect to the boom on support means, comprising the steps of: releasably and piVotally connecting the foot end of said jib to the point of said boom; telescopically moving said boom to effect axial movement of said jib with respect to said support means; and pivoting said jib with respect to said boom while said jib is clear of said support means.
Claim 24
Independent Claim
118 words
A method of employing a telescopic crane boom to handle a telescopic jib storable parallel to and in reverse disposition with respect to the boom on support means, comprising the steps of: releasably and pivotally connecting the foot end of said jib to the point of said boom; telescopically moving said boom to effect axial movement of said jib with respect to said support means; releasably securing another portion of said jib to a relatively fixed point; telescopically moving said boom to effect axial telescoping of said jib; unsecuring said other portion of said jib from said relatively fixed point; and pivoting said jib with respect to said boom while said jib is clear of said support means.
Claim 25
Independent Claim
118 words
A method of employing a telescopic crane boom to handle a telescopic jib storable parallel to and in reverse disposition with respect to the boom on support means, comprising the steps of: releasably and pivotally connecting the foot end of said jib to the point of said boom; telescopically moving said boom to effect axial movement of said jib with respect to said support means; releasably securing another portion of said jib to a relatively fixed point; telescopically moving said boom to effect axial telescoping of said jib; unsecuring said other portion of said jib from said relatively fixed point; and pivoting said jib with respect to said boom while said jib is clear of said support means.
Claim 26
Independent Claim
87 words
A method of connecting a jib to the boom point of a telescopic crane boom where said jib is stored alongside of and in reverse disposition with respect to said boom on support means, comprising the steps of: releasably and pivotally connecting the foot end of said jib to the point of said boom; extending said boom to axially move said jib clear of said support means; pivoting said jib into end-to-end relationship with said boom; and releasably securing said jib to said boom in end-to-end relationship.
Claim 27
Independent Claim
87 words
A method of connecting a jib to the boom point of a telescopic crane boom where said jib is stored alongside of and in reverse disposition with respect to said boom on support means, comprising the steps of: releasably and pivotally connecting the foot end of said jib to the point of said boom; extending said boom to axially move said jib clear of said support means; pivoting said jib into end-to-end relationship with said boom; and releasably securing said jib to said boom in end-to-end relationship.
Claim 28
Independent Claim
124 words
A method of extending and connecting a telescopic jib to the boom point of a telescopic crane boom where said jib is stored alongside of and in reverse disposition with respect to said boom on support means, comprising the steps of: releasably and pivotably connecting the foot end of said jib to the point of said boom; extending said boom to axially move said jib clear of said support means; releasably securing another portion of said jib to a relatively fixed point; extending said boom to effect axial extension of said jib; unsecuring said other portion of said jib from said relatively fixed point; pivotong said jib into end-to-end relationship with said boom; and releasably securing said jib to said boom in end-to-end relationship.
Claim 29
Independent Claim
124 words
A method of extending and connecting a telescopic jib to the boom point of a telescopic crane boom where said jib is stored alongside of and in reverse disposition with respect to said boom on support means, comprising the steps of: releasably and pivotably connecting the foot end of said jib to the point of said boom; extending said boom to axially move said jib clear of said support means; releasably securing another portion of said jib to a relatively fixed point; extending said boom to effect axial extension of said jib; unsecuring said other portion of said jib from said relatively fixed point; pivotong said jib into end-to-end relationship with said boom; and releasably securing said jib to said boom in end-to-end relationship.
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) | 1977-08-26 | 1978-02-25 | 1978-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-26 | 1982-02-25 | 1982-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-26 | 1986-02-25 | 1986-08-27 | $7700.00 | Window Closed / Lapsed |