Need info RE: a swivel for a steel hoist

Question

Need info RE: a swivel for a steel hoist

SRO (Structural)

(OP)

29 Jan 03 12:17

I am designing a steel hoist system for a chain fall that can swivel.  It's a simple design for the most part, except for the fact that the hoist needs to swivel at least 180 deg. at the base.
            _______7'_______
            |                         |
            |                         |
            |                         V
            |                       4 kip
            |
           10'
            |
            |
            |
            |   __swivel here
            |  /
            | /
       ___|/___
       ////////

This is the first case like this I've come across, and the only solution I could think of was some kind of bearing.  The problem is that I don't have any info as far as:
     *the connection (to both the steel column and the concrete footing),
     *selection (size/type of bearing),
     *cost,
     *or even how to get the bearings.

Am I heading in the right direction with this, or should I do something completely different?

smcadman (Mechanical) · Answer 1 · 2003-01-29 13:52:54

In one of the shops I worked in, they had a crane-hoist design similar to what you're proposing. The vertical beam was simply a pipe about 6 to 8 inches in diameter, and was inserted into a pipe base that was bolted to the floor. The pipe base had gussets along the outside that was welded to a round plate on the bottom and in turn, this bottom plate was bolted to the floor.
The base had a couple of grease fittings. This crane had pretty much the dimensions stated above, except our Yale hoist was rated at 1 ton working load.
This crane-hoist wasn't elegant in design, but maybe it will generate some discussion to help you out.

Flores

kenvlach (Materials) · Answer 2 · 2003-01-29 23:16:54

A jib crane is exactly right. McMaster-Carr catalog shows several styles w. capacities & dimensions. Search for jib crane or simply go to page 1256 & 1257 in online catalog.
http://www.mcmaster.com/

mgg (Structural) · Answer 3 · 2003-01-30 20:47:00

I don't mean to be technical; however, the crane you are refering to is termed "pillar-jib crane" as the jib is not mounted on a wall or vertical face but a pillar. Considering that you are designing something unfamiliar with, I would suggest subcontracting out to a qualified crane manufacturer. Though if you are interested, I have a one-page drawing of the said equipment in my WHE inventory.

SRO (Structural) · Answer 4 · 2003-01-31 09:52:38

mannyg:
Thanks your input as far as passing the job off to someone else, but I would never have become an engineer if the job description was pumping out the same type of job over and over again. Although this is the first pillar-jib crane that I've done, I don't see a problem with the structure itself. Originally, my problem was getting the crane to rotate, but thanks to all of the responses I have a lot better understanding of how these cranes work. You can never have enough information, so as far as that detail you mentioned, you can e-mail me or fax which ever is easier for you. Thanks

sorlowski@fieldengrg.com
Fx: 1(508) 758-2849

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Need info RE: a swivel for a steel hoist