# US 4,395,192 A · Boom cylinder

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- Number: US 4,395,192 A
- Document ID: US4395192A
- Status: Granted
- Kind: A
- Application number: 06/227,020
- Filed: 1981-01-19
- Granted: 1983-07-26
- Earliest claimed: 1981-01-19
- Assignees: The Warner & Swasey Company
- Inventors: Paul W. Schlafly
- Web page: https://patentgrep.com/patent/US4395192A

## CPC

- E02F 3/286: {telescopic or slidable (fork-lift trucks with a telescopic boom B66F9/0655)}
- B66C 23/705: {telescoped by hydraulic jacks}
- E02F: DREDGING; SOIL-SHIFTING (winning peat E21C49/00)
- 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

An improved material handling apparatus boom cylinder structure. A hydraulic cylinder is provided inside an outer boom and an inner boom in order to provide a method for slidably moving the inner boom relative to the outer boom. Affixed to the hydraulic boom cylinder is a boom cylinder support adapted to engage the internal structure of the inner boom in order to provide support for the hydraulic cylinder.

## Claims

### Claim 1

A material handling vehicle comprising:
an upper structure;
an outer boom rotatable about its longitudinal axis;
an inner boom rotatable with said outer boom about their common longitudinal axis and partially disposed for telescopic positioning within said outer boom and said inner boom supporting a material handling device at its exposed end;
a boom cradle, pivotally supported from said upper structure, supporting said outer boom for rotation about its longitudinal axis;
a hydraulic cylinder, not rotatable with said outer boom, having one end connected to said boom cradle and having operating rod means extending from the other end thereof which engages and permits said inner boom to rotate around its longitudinal axis with respect to said hydraulic cylinder and for telescopic positioning of said inner boom with respect to said outer boom; and,
a cylinder support, longitudinally fixed in close proximity to the rod end of said cylinder, providing support for the end of said cylinder from the inside of said inner boom.

### Claim 2 (depends on 1)

A material handling vehicle as claimed in claim 1 wherein:
said inner boom is rotatable about its longitudinal axis only with said outer boom; and comprising,
rotating means for rotating said outer boom.

### Claim 3 (depends on 1)

A material handling vehicle as claimed in claim 1 comprising:
bearing means disposed between said cylinder and said inner boom for rotatably supporting said cylinder with respect to said inner boom.

### Claim 4

A material handling vehicle comprising, a hydraulic extendable boom excavator having a rotatable outer boom, an inner boom rotatable with said outer boom about their common longitudinal axis and slidably disposed partially within said outer boom, a hydraulic boom cylinder for positioning said inner boom relative to said outer boom, the improvement characterized by:
an operating rod rotatable with respect to and extending from one end of said hydraulic boom cylinder and engaging said inner boom, and the other end of said hydraulic boom cylinder extending from said outer boom and said hydraulic boom cylinder is restrained against rotation with said outer boom and said inner boom; and,
a cylinder support longitudinally fixed to the rod end of said hydraulic cylinder and providing support from the inner boom.

### Claim 5 (depends on 4)

A material handling vehicle as claimed in claim 4 characterized by:
bearing means for connecting said cylinder support to said hydraulic cylinder for providing relative rotary motion therebetween.

### Claim 6 (depends on 4)

A material handling vehicle as claimed in claim 4 characterized by:
a plurality of rollers supporting said cylinder support from the inside of said inner boom.