Adjustable wear pad assembly for a telescopic boom

Patent metadata

Field	Value
Publication number	US-9950911-B2
Application number	US-201414894603-A
Country	US
Kind code	B2
Filing date	May 30, 2014
Priority date	May 31, 2013
Publication date	Apr 24, 2018
Grant date	Apr 24, 2018

Abstract

A wear pad assembly for a telescopic boom includes a wear pad having a first side for contacting an outer wall of an inner section of the boom, and a second side facing an inner wall of an outer section of the boom. At least one rigid plate is secured to the second side of the wear pad, and a stud in screw-threaded engagement with the outer section of the boom or a plate secured to the outer section of the boom is associated with each rigid plate, the end of stud and the associated rigid plate having mating formations to enable the stud to urge the first surface of the wear pad against the outer wall of the inner section while preventing the wear pad from being displaced in a plane normal to the axis of rotation of the stud.

First claim

The invention claimed is:

1. A wear pad assembly for mounting between an inner and an outer section of a telescopic boom, comprising:
a wear pad having a continuous first side having an area substantially equal to an area bounded by lateral edges of the wear pad, the first side configured for contacting an outer wall of an inner section of the boom, and a second side facing an inner wall of an outer section of the boom,
at least one plate is secured to the second side of the wear pad so as not to be movable relative to the wear pad, wherein the at least one plate is secured by an interference fit in a recess formed in the second side of the wear pad; and
a stud in screw-threaded engagement with the outer section of the boom or a member secured to the outer section of the boom is associated with said at least one plate, an end of stud and the associated said at least one plate having mating formations to enable the stud to urge the first surface of the wear pad against the outer wall of the inner section of the boom while preventing the wear pad from being displaced in a plane normal to the axis of rotation of the stud.

2. A wear pad assembly as claimed in claim 1 , wherein the mating formations comprising a circular hole in said at least one plate and a cylindrical spigot on the end of the stud.

3. A wear pad assembly as claimed in claim 1 , wherein a lock nut is provided for preventing rotation of each stud relative to the outer section of the boom.

4. A wear pad assembly as claimed in claim 3 , wherein a washer is provided between the lock nut and the outer section of the boom or the member secured to the outer section of the boom.

5. A wear pad assembly as claimed in claim 1 , wherein the end of each stud remote from the associated wear pad is formed with a non-circular recess for receiving a drive key.

6. A wear pad for mounting between an inner and an outer section of a telescopic boom, comprising:
a body of plastic material having a first side and a second side facing opposite the first side, wherein one of the first and second sides is continuous and at least one plate is secured to the other of the first and second sides of the body, the at least one plate being formed with a formation capable of interacting with a screw threaded stud to prevent the wear pad from moving in a plane normal to the axis of the stud
wherein the said at least one plate is two plates secured to the other of the first and second sides of the body.

7. A wear pad as claimed in claim 6 wherein the plates are each secured to the body by being an interference fit in a respective recess formed in the other of the first and second sides of the body.

8. A wear pad as claimed in claim 6 , wherein the formation in each plate comprises a cylindrical bole for receiving a cylindrical spigot formed on the end of an associated stud.

9. A wear pad assembly for mounting between an inner and an outer section of a telescopic boom, comprising:
a wear pad having a continuous first side for contacting an outer wall of an inner section of the boom, and a second side facing an inner wall of an outer section of the boom,
at least one plate is secured to the second side of the wear pad so as not to be movable relative to the wear pad, wherein the at least one plate is secured by an interference fit in a recess formed in the second side of the wear pad; and
a stud in screw-threaded engagement with the outer section of the boom or a member secured to the outer section of the boom is associated with said at least one plate, an end of stud and the associated said at least one plate having mating formations to enable the stud to urge the first surface of the wear pad against the outer wall of the inner section of the boom while preventing the wear pad from being displaced in a plane normal to the axis of rotation of the stud,
wherein said at least one plate comprises two plates that are secured to the second side of the wear pad.

Assignees

• Cnh Ind America Llc

Inventors

• Fortunato Adolfo
• Simonetti Emanuele

Classifications

• F16C2326/00

  Articles relating to transporting · CPC title

• B66C23/707 Primary

  guiding devices for telescopic jibs · CPC title

• F16C29/02

  Sliding-contact bearings · CPC title