Crane with rotary locking mechanism

Patent metadata

Field	Value
Publication number	US-10457529-B2
Application number	US-201715496350-A
Country	US
Kind code	B2
Filing date	Apr 25, 2017
Priority date	Apr 25, 2016
Publication date	Oct 29, 2019
Grant date	Oct 29, 2019

Abstract

A telescoping crane boom having a rotary locking mechanism. A motor drives a rotating element about an axis parallel to the axis of the crane boom. The rotation of the rotating member causes a pin to selectively lock and unlock sections of the telescoping crane boom.

First claim

The invention claimed is:

1. A telescoping boom, comprising:
a base section having a base end and a telescoping end;
a first telescoping section disposed within the base section, the first telescoping section having a recess configured to receive a cylinder-to-section pin;
an inverted hydraulic actuator disposed within the base section, the inverted hydraulic actuator having a rod and a cylinder configured to extend and retract longitudinally relative to the base section;
a rotating element coupled to the cylinder, the rotating element having an axis of rotation parallel to a longitudinal axis of the base section and the cylinder-to-section pin perpendicular to the axis of rotation, the rotating element having a first configuration in which the cylinder-to-section pin engages the first telescoping section and a second configuration angularly offset from the first configuration in which the cylinder-to-section pin does not engage the first telescoping section; and
a motor coupled to the base section and the rotating element, the motor configured to rotate the rotating element and the cylinder-to-section pin relative to the base section.

2. The telescoping boom of claim 1 , wherein the recess has a ramped engagement in a longitudinal direction.

3. The telescoping boom of claim 1 , further comprising a plurality of proximity sensors disposed in the base section, the plurality of proximity sensors configured to identify a boom section.

4. The telescoping boom of claim 1 , further comprising a second telescoping section disposed within the first telescoping section.

5. A crane comprising:
a chassis;
an upper works coupled to the chassis, the upper works comprising the telescoping boom of claim 1 .

6. The crane of claim 5 , wherein the recess has a ramped engagement in a longitudinal direction.

7. The crane of claim 5 , wherein the telescoping boom further comprises a plurality of proximity sensors disposed in the base section, the plurality of proximity sensors configured to identify a boom section.

8. The crane of claim 5 , wherein the telescoping boom further comprises a second telescoping boom section disposed within the first telescoping boom section.

9. A rotary locking mechanism for a crane boom, comprising:
a rotating element having a bearing surface configured to interact with an inverted hydraulic cylinder;
a motor configured to drive the rotating element about an axis of rotation; and
at least one cylinder-to-section pin having a first configuration corresponding to the rotating element being in a first angular orientation and a second configuration corresponding to the rotating element being in a second angular orientation wherein the at least one cylinder-to-section pin is configured to rotate from the first configuration to the second configuration.

10. The rotary locking mechanism of claim 9 , wherein a body of the motor is fixed relative to the bearing surface of the rotating element.

11. The rotary locking mechanism of claim 9 , wherein a body of the motor is fixed relative to the at least one cylinder-to-section pin.

Assignees

• Manitowoc Crane Companies Llc

Inventors

• Schoonmaker Stephen J

Classifications

• B66C23/708 Primary

  locking devices for telescopic jibs · CPC title

• B66C23/42

  with jibs of adjustable configuration, e.g. foldable · CPC title

• B66C23/705

  telescoped by hydraulic jacks · CPC title