PORTABLE EXTENDIBLE CRANE WITH WORK BASKET

• US 3,710,893 A
• Filed: 06/21/1971
• Issued: 01/16/1973
• Est. Priority Date: 06/21/1971
• Status: Expired due to Term

• Current Assignee: American Lafrance LLC (LD Investment LLC)
• Original Assignee: Wilburn L. Hippach
• Inventors: Hippach, Wilburn L.
• Primary Examiner(s): Machado, Reinaldo P.
• Application Number:
  US05/154,975
• Time in Patent Office: 575 Days
• Field of Search: 182/2,66,67,106,141,148
• US Class Current: 182/2.5
• CPC Class Codes: B66F 11/046 of the telescoping type
• CPC Class Codes: E06C 5/04 capable of being elevated or extended ; Fastening means during transport, e.g. mechanical, hydraulic

Abstract

A power extendible crane boom and ladder having a depending work basket pivoted to a yoke extension on the end of the boom and including adjustable bracing and safety ladder means between the crane and basket in all positions.

Claims

1. In combination a power boom, a ladder support on the boom, a ladder carried by said support, means secured to the end of the boom having spaced supports, a work basket pivoted at its top to and between said supports for relative angular orientation with respect to the boom, ladder means bridging said ladder and work basket including a first member pivotally connected to said basket at one end and a second member supported at one end at a fixed point adjacent to and within a step from the end rung of the ladder, and means connecting said members at their other ends to provide relative movement therebetween to vary the distance between their said one ends and accommodate relative angular orientation between said boom and basket.

2. The combination defined in claim 1 in which said interconnecting means is a pivotal connection movable with respect to said ladder.

3. The combination defined in claim 2 in which said pivotal connection moves in an arc and includes the endmost rung on said ladder.

4. The combination defined in claim 2 in which said pivot includes a ladder rung spaced the distance of a step from the end rung of sAid ladder when said angle is approximately 45*.

5. The combination defined in claim 1 in which said second member comprises track carried by said ladder and said interconnecting means includes pivotal means movable along said track.

6. The combination called for in claim 2 in which said pivotal connections include rungs as part of said ladder means.

7. A crane comprising, an extendible boom, an extension ladder carried by the boom a spaced distance above the boom, yoke means secured to the end of the boom and including a spacer fastened to the end of the boom and two spaced arms defining co-axial pivots at their ends, a depending basket defining a work platform pivotally supported adjacent to its upper end on said pivots at an angle to the boom inclination, means interconnecting the extension ladder and a lower portion of the basket including a collapsible ladder accommodating relative movement of the basket, means to secure the basket against swaying in the vertical plane of the boom, and hand rail means extending above and along both sides of said extension ladder and collapsible ladder.

8. The crane defined in claim 7 in which said hand rail means is continuous and terminates at said yoke arms above said basket.

9. The crane defined in claim 7 in which said basket comprises reticulated walls surrounding and supporting the platform and defining a step up basket access opening facing said collapsible ladder.

10. A crane comprising a boom, a yoke means on the end of said boom defining horizontally spaced arms, a depending basket pivoted to and between said spaced arms and having a step-in opening on the boom side, collapsible ladder means supported at one end on the basket at the bottom of said opening and at the other end on said yoke means, and extension ladder means on said boom terminating proximate to a rung on an intermediate portion of said collapsible ladder a spaced distance above said yoke.

11. The combination defined in claim 10 in which said extension ladder means is spaced above said boom and yoke means a distance at least the distance between two rungs of the collapsible ladder means.

12. The combination defined in claim 10 including a winch carried by said boom in close proximity to the collapsible ladder including a cable secured at its free end to the basket to draw the basket into parallel orientation with said yoke arms in a direction collapsing said ladder means.

13. A portable power crane having a boom of telescoping extendible sections, upstanding spacer brackets on the upper ends of each section, extension ladder sections fastened at their upper ends to said spacer brackets a distance above the boom section at least equal to the distance between rungs on the ladder, means for supporting the lower ends of the upper ladder section on the upper end of the next lower ladder section, telescoping hand rails carried by the ladder sections, work basket means pivotally mounted to the outer end of the endmost boom section having a rail higher than a man'"'"''"'"'s center of gravity and an access opening in alignment with said ladder, means pivotally interconnecting said basket means at said access opening and the end of said outer ladder section including an adjustable ladder, and hand rail means bordering both sides of said extension ladder and adjustable ladder means extending to a point proximate to the top of said basket means.