Internally supported power track

Patent metadata

Field	Value
Publication number	US-10174868-B2
Application number	US-201715784773-A
Country	US
Kind code	B2
Filing date	Oct 16, 2017
Priority date	Mar 7, 2013
Publication date	Jan 8, 2019
Grant date	Jan 8, 2019

Abstract

A boom assembly for a lift device includes a plurality of telescoping boom sections. The plurality of telescoping boom sections include a base boom section, a mid boom section, and a fly boom section. The plurality of telescoping boom sections define an inner volume. The boom assembly also includes a push tube coupled to the base boom section and a support member positioned within the inner volume. The support member includes sidewalls having an inner surface and an outer surface. The boom assembly also includes a power track positioned within the inner volume that includes a plurality of movable links, a first supported portion that interfaces with at least one of the inner surface of the support member and a surface of the push tube, and a second supported portion that interfaces with the outer surface of the support member.

First claim

What is claimed is:

1. A boom assembly for a lift device, comprising:
a plurality of telescoping boom sections including a base boom section, a mid boom section, and a fly boom section, wherein the plurality of telescoping boom sections define an inner volume;
a push tube directly coupled to the base boom section;
a support member positioned within the inner volume, the support member comprising sidewalls having an inner surface and an outer surface; and
a power track positioned within the inner volume and comprising a plurality of movable links, a first supported portion that interfaces with at least one of the inner surface of the support member or a surface of the push tube, and a second supported portion that interfaces with the outer surface of the support member; wherein the power track includes a first end attached to a first end of the push tube, and the push tube includes a second end opposite the first end of the push tube and the second end of the push tube is directly coupled to the base boom section.

2. The boom assembly of claim 1 , wherein the power track includes a first end coupled to the base boom section and a second end coupled to the fly boom section.

3. The boom assembly of claim 2 , wherein the first supported portion is offset from the second supported portion.

4. The boom assembly of claim 2 , wherein the first end of the power track is coupled to the base boom section with a first interface link and the second end of the power track is coupled to the fly boom section with a second interface link, the length of the power track between the first interface link and the second interface link defining a working length of power track.

5. The boom assembly of claim 4 , wherein the entire length of the power track between the first supported portion and the second supported portion is supported by the support member in at least one configuration of the boom assembly.

6. The boom assembly of claim 5 , wherein the first supported portion and the second supported portion contact the support member along their entire lengths.

7. The boom assembly of claim 6 , further comprising a guide block positioned within the support member, wherein the guide block is coupled to the first end of the power track and directly coupled to an end of the push tube.

8. The boom assembly of claim 1 , wherein the mid boom section and the fly boom section are translatable between a retracted position and an extended position, and wherein the power track pays out as the mid boom section and the fly boom section translate from the retracted position to the extended position.

9. The boom assembly of claim 8 , wherein the length of the first supported portion decreases and the length of the second supported portion increases as the plurality of telescoping boom sections translate from the retracted position to the extended position.

10. The boom assembly of claim 8 , further comprising a telescopic cylinder including a rod and a tube, wherein the rod is coupled to the base boom section and the tube is coupled to the support member.

11. The boom assembly of claim 10 , wherein the mid boom section and the support member pay out at a rate of about 1:1 relative to the base boom section and the fly boom section pays out at a rate of about 1:1 relative to the mid boom section.

12. The boom assembly of claim 11 , further comprising a fly carrier tube coupled to the fly boom section.

13. A lift device, comprising:
a chassis;
a plurality of telescoping boom sections coupled to the chassis and including a base boom section, a mid boom section, and a fly boom section, wherein the plurality of telescoping boom sections define an inner volume;
a push tube directly coupled to the base boom section;
a support member positioned within the inner volume, the support member comprising sidewalls having an inner surface and an outer surface; and
a power track coupled to the push tube, positioned within the inner volume, and comprising a first portion that interfaces with the inner surface of the support member and a second portion that interfaces with the outer surface of the support member; wherein the power track is directly or indirectly laying on a surface of the push tube.

14. The lift device of claim 13 , wherein the plurality of telescoping boom sections are translatable between a retracted position and an extended position, the power track configured to pay out as the plurality of telescoping boom sections translates from the retracted position to the extended position.

15. The lift device of claim 13 , further comprising at least one of an aerial work platform or a lift fork or combinations thereof coupled to an end of the fly boom section.

16. The lift device of claim 13 , further comprising at least one of a hose or a cable or combinations thereof positioned within the power track.

Assignees

• Oshkosh Corp

Inventors

• Ditty Mckenzie M
• Wilson Matthew G

Classifications

• F16L3/015 Primary

  using articulated- or supple-guiding elements · CPC title

• B66F11/046 Primary

  of the telescoping type · CPC title

• B66C23/705

  telescoped by hydraulic jacks · CPC title

• B66C13/12

  Arrangements of means for transmitting pneumatic, hydraulic, or electric power to movable parts of devices · CPC title