IMPROVEMENT IN CRANES
Year: 1884

page_text: I, GEORGE RUSSELL, Alpha Works, Motherwell, Lanarkshire, North Britain,
Engineer, do hereby declare the nature of my Invention for IMPROVEMENT IN
CRANES to be as follows:-
It relates to such cranes as revolve on a central post or pillar, and its object is to
obtain increased economy, convenience, and efficiency: by excluding dust from the
wearing surfaces of the post bearings and making the bearing at top of post
adjustable and removeable, without requiring to take down, or interfere with, other
parts of the crane.
:
According to one modification-the post is constructed with a boaring at its top,
and a bearing at, or near, bottom of revolving portion of crane. A jacket or cабе
surrounds the post between, and connects, these bearings. The top of this jacket
is screwed internally, to suit a bush of steel or other hard metal, which is screwed
externally. This bush is bored to suit the top of crane post, and is closed at upper
end, so as to rest on top of post: from which the revolving portion of crane is thus
suspended. This bush is provided with a square top, by means of which it is
turned, and thus screwed in or out of jacket: so that it can be removed and
replaced; or adjusted, to keep the revolving portion of crane, at a uniform height;
notwithstanding the wear of surfaces. A guard is fitted to the square top of bush,
to keep it in position when working.
Dated this Second day of January 1884

page_text: s
I, GEORGE RUSSELL, of Alpha Works, Motherwell, in the County of Lanark,
North Britain, Engineer, do hereby declare the nature of my Invention for
IMPROVEMENT IN CRANES and in what manner the same is to. be performed, to
be particularly described and ascertained in and by the following statement:-
My Invention of improvement in cranes, relates to such cranes as revolve on a
central post or pillar, and its object is to obtain increased economy convenience
and efficiency, by excluding dust from the wearing surfaces of the post bearings,
and making the bearing at top of post adjustable and removeable, without requiring
to take down, or interfere with, other parts of the crane. According to one
modification, the post is constructed with a bearing at its top, and a bearing at, or
near, bottom of revolving portion of crane. A jacket or case surrounds the post
between, aud connects these bearings. The top of this jacket is screwed internally,
to suit a bush of steel or other hard metal, which is screwed externally. This
bush is provided with a square top, by means of which it is turned, and thus
screwed in or out of jacket, so that it can be removed and replaced; or adjusted,
to keep the revolving portion of the crane at a uniform height, notwithstanding.
the wear of surfaces. A guard is fitted to the square top of bush to keep it in
position when working.
DESCRIPTION OF DRAWING.
Represents a vertical section of the bearings of a crane post. The post A may
be fixed vertically in a soleplate or carriage. The bearing or bush B is of steel or
other suitable metal, and is screwed into the jacket or case C, which is continued
down to the bottom bearing. The post is thus entirely enclosed. There is a
square top on the bearing, for turning it by a spanner, to which is fitted a cap E,
fixed by bolts to the cross girder D. This prevents the bearing changing its
position when working. The bearing B is adjusted by screwing it in the case, so
as to maintain the revolving portion of the crane at a constant level, notwith-
standing any wear. It can also be removed and replaced for inspection or
cleaning in a few minutes. This is done by removing the cap, and unscrewing the
bearing out of the case, when the revolving portion rests on the soleplate or
carriage at F. By preference the post is made to fit the case at G, so as to keep
the revolving portion of the crane in position, for re-entering the bearing.
Instead of screwing the bearing into the case, it may be fixed and adjusted by
means of bolts, levers, wedges, or other substitute.
Having now particularly described and ascertained the nature of my said
Invention, and in what manner the same is to be performed, I declare that what
I claim is:
The application to a crane post of an adjustable and removeable top bearing,
combined with a case, enclosing the crane post between top and bottom bearings.
Dated this Twentieth day of August 1884.