# US 9,751,733 B2 · Collar bearing for a telescopic boom as well as telescopic boom and crane

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- Number: US 9,751,733 B2
- Document ID: US9751733B2
- Status: Granted
- Kind: B2
- Application number: 14/323,191
- Filed: 2014-07-03
- Published: 2015-01-08
- Granted: 2017-09-05
- Earliest claimed: 2013-07-04
- Assignees: Liebherr-Werk Ehingen GmbH
- Applicants: Liebherr-Werk Ehingen GmbH
- Inventors: Engelbert Häbe; Ralf Schörle
- Web page: https://patentgrep.com/patent/US9751733B2

## CPC

- B66C 23/707: {guiding devices for telescopic jibs}
- B66C 23/701: {telescopic}
- B66C 23/705: {telescoped by hydraulic jacks}
- B66C 23/708: {locking devices for telescopic jibs}
- B66C: CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES ({specially adapted for lifting invalids A61G7/10;} rope, cable, or chain winding mechanisms, braking or detent devices therefor B66D; specially adapted for nuclear reactors G21)

## Abstract

The invention relates to a collar bearing for a telescopic boom for the sliding support of two telescopic sections in the collar region of the outer telescopic section, wherein the collar bearing includes fixing means, whereby the collar bearing selectively is releasably connectable with the outer or inner telescopic section.

## Claims

### Claim 1

A telescopic boom (2), comprising a collar bearing situated upon an outer hollow articulation section (3) and arranged for sliding support of two inner telescopic sections (5a, 5b) in a collar region of the outer hollow articulation section (3) arranged to receive the telescopic sections (5a, 5b) therein, wherein
the collar bearing includes a collar (13) situated at an end of the articulation section (3),
a guide frame (50) concentrically arranged between the outer articulation section (3) and an outermost telescopic section (5a) of said two telescopic section (5a, 5b),
a first guide bolt (53) arranged to couple the guide frame (50) to the outermost telescopic section (5a) and reciprocatingly seating in a matching bore on an outer circumference of the outermost telescopic section (5a), and
a second guide bolt (52) mounted at the collar (13) and arranged to reciprocatingly seat in a matching bore on the guide frame (50).

### Claim 2 (depends on 1)

The telescopic boom (2) according to claim 1, wherein the guide frame has one or more sliding means.

### Claim 3 (depends on 2)

The telescopic boom (2) according to claim 2, wherein the sliding means are in the form of one or more bearing shoes.

### Claim 4 (depends on 1)

The telescopic boom (2) according to claim 1, wherein the first and second guide bolts are actuated hydraulically.

### Claim 5 (depends on 1)

The telescopic boom (2) according to claim 1, wherein the first and second guide bolts are operated automatically.