Improvements in Bollards, Fairleads, Gangway-rollers, and Sheaves, adapted for use in connection with Trawl-warps and otherwise.
Year: 1896

page_text: Improvements in Bollards, Fairleads, Gangway-rollers, and Sheaves,
adapted for use in connection with Trawl-warps and otherwise.
We, ANDREW COCHRANE and GEORGE COOPER, both of Grovehill Shipyard, Beverley,
in the County of York, Shipbuilders, do hereby declare the nature of this invention
to be as follows:-
This invention relates to an improved method of constructing bollards, fairleads
gangway-rollers and sheaves, such as are used in working trawl-warps and for like
services, and is designed to diminish the slipping action of the warp, to reduce
friction in working, and to facilitate repairs.
According to our improved mode of construction, the drums, barrels, sheaves or
rollers, are formed of cast metal, such as iron, steel or brass, and are arranged to
revolve about a central spindle or shatt. In the outer surface of the drum, barrel,
roller or sheave, and parallel to the axis thereof, a number of dovetail shaped
grooves are formed. Into these grooves are inserted suitably shaped strips of metal;
the latter passing through flanges at each end and being secured therein by means
of set-screws. The strips are further secured in their dovetail grooves by means of
screws. The object of these strips is to take the wear caused by the cutting
action of the wire warp or chain. Ordinarily the barrel, roller or the like takes
this wear on its own surface and becomes scored by the slipping action of the
warp, and thus both roller and warp are destroyed. The strips may be readily
removed from time to time as wear takes place. Moreover the action of the warp
on these strips is such as to cause the barrel or sheave to revolve more certainly and
Consequently with less slip.
To further reduce the tendency of the warp to slip over the surface of the strips,
the drum, barrel or roller should turn as easily as possible, and with this object we
mount it to revolve upon anti-friction balls.
When the drum or barrel is intended to be used as a bollard or fairlead with its
axis vertical, it revolves about a vertical spindle or shaft secured in a strong base.
The lower face of the drum or roller is formed with a recess into which is fitted a
sleeve, muff or collar. This latter projects below the face of the barrel and enters a
similar recess formed in the base-plate. Between the adjacent faces of the collar and
plate, the anti-friction balls are placed; suitable grooves being formed in these faces
to receive the balls. A similar recess is formed in the upper face of the barrel, for
the reception of the upper collar, which, fixed to the centre spindle by a key, pin or
nut, retains the barrel on the spindle.
By making these recesses and collars exactly similar as to diameter, depth and
thickness, the drum or barrel may be readily reversed; the upper collar fitting in

page_text: what was previously the lower recess, and the lower collar occupying what was
previously the upper recess.
In both faces of the lower collar, grooves are formed to fit the balls, so that this
collar is also reversible and can be changed as wear takes place.
The upper collar is formed to serve as an oil box; holes drilled in it and scores 5
ormed in the barrel, drum or the like allowing the oil to flow to the working
faces.
A suitable cover, attached to the upper face of the barrel, protects the upper
collar and spindle end.
The depth and exact formation of the bed plate or base may be varied to suit 1
requirements.
When the drum or barrel is used as a gangway-roller, the anti-friction balls are
contained partly in a groove formed in the lower part or face of the barrel and partly
in a collar-fitting resting upon the lower portion of the gangway frame.
In a sheave inounted upon a horizontal spindle, the working surface may be 1
similarly formed with dovetail grooves furnished with renewable strips adapted to
take the wear and to diminish the tendency of the warp to slip.
Improvements in Bollards, Fairleads, Gangway-rollers, and Sheaves,
adapted for use in connection with Trawl-warps and otherwise.
We, ANDREW COCHRANE and GEORGE COOPER, both of Grovehill Shipyard, Beverley,
in the County of York, Shipbuilders, do hereby declare the nature of this invention
and in what manner the same is to be perforined to be particularly described and
ascertained in and by the following statement:-
This invention relates to an improved method of constructing bollards, fairleads,
gangway-rollers and sheaves, such as are used in working trawl-warps and for like
services, and is designed to diminish the slipping action of the warps, to reduce
friction in working and to facilitate repairs.
In the accompanying drawings,
Figs. 1 and 2 are respectively a vertical section and a horizontal section of a
bollard or fairlead constructed according to our improved method;
Fig. 2 being a plan of the upper collar employed in connection therewith.
Figs. 3 and 4 are a vertical section and a horizontal section respectively of a
gangway-roller and
Fig. 5 is a longitudiual section of a sheave.
The drums, barrels, sheaves or rollers A, are formed of cast metal, such as iron,
steel or brass, and are arranged to revolve about a central spindle or shaft B. In
the outer surface of the drum, barrel, roller or sheave, and parallel with its axis, a
number of dovetail shaped grooves a are formed. Into these grooves are inserted
Buitably shaped strips of metal a'; the latter passing through flauges at at each end
of the drum, barrel, roller or sheave and being secured therein by means of
set-screws a³. The strips are further secured in their dovetail grooves by means of

page_text: Screws (Fig. 3). The object of these strips is to take the wear caused by the
cutting action of the wire warp or chain. Oxdinarily the barrel, roller or the like
takes this wear on its own surface, and becomes score by the slipping action of the
warp; both the roller and the warp being destroyed. The strips may be readily
renowed from time to time as wear takes place. Moreover the action of the warp on
these strips is such as to cause the barrel or sheave to revolve more certainly and
consequently with less slip. In order to further reduce the tendency of the warp to
slip over the surface of the strips, the drun, barrel, or roller should turn as
easily as possible, and with this object we mount it to revolve upon anti-friction
balls bb.
When the drum or barrel is intended to be used as a bollard or fairlead, with its
axis vertical (Figs. 1 and 2), it revolves about a vertical spindle or shaft B secured in
a strong base-plate C. The lower face of the drum or roller is formed with a recess
into which is fitted a sleeve, muff or collar D; this latter projecting below the face of
the barrel and entering a similar recess formed in base-plate C. Between the
ndjacent faces of the collar D and piate C, the anti-friction balls bb are placed;
suitable grooves & and c being formed in these faces to receive the balls. A similar
recess is formed in the upper face of the barrel, for the reception of the upper
collar E, which is fixed to the spindle B by a key, pin or nut and retains the barrel A
on the spindle.
d
By making the recesses in the faces of the barrel and the collars exactly similar as
to diameter, depth and thickness, the drum or barrel may be readily reversed; the
upper collar E fitting in what was previously the lower recess, and the lower collar D
occupying what was previously the upper recess.
In both faces of the lower collar, grooves d d are formed to fit the tails, so that this
collar is also reversible and can be changed as wear takes place.
The upper collar E is formed to serve as an oil box; hcies e, drilled in it, and
scores e, formed in the barrel, drum or the like, allowing the oil to flow to the
working faces.
A suitable cover F, attached to the upper face of the barrel, protects the upper
collar and spindle-end.
The depth and exact formation of the bed plate or base, may be varied to suit
requirements.
When the drum or barrel is used as a gangway-roller (Figs. 3 and 4), the
anti-friction balls b are contained partly in a groove forined in the lower part or face
of the barrel and partly in a collar-fitting G resting upon the lower portion of the
gangway-frame H.
In a sheave mounted upon a horizontal spindle (Fig. 5), the working surface may
be similarly formed with dovetail groves furnished with renewable strips al adapted
to take the wear and to diminish the tendency of the warp to slip.
Having now particularly described and ascertained the naturo of this invention
and in what manner the same is to be performed, we claim :-
1. The improved construction of bollards, fairleads, gangway-rollers and sheaves,
substantially as herein described, wherein the working surfaces are provided with
renewable strips for the purpose of taking the wear incidental to winding and
unwinding the warp, the life of the bollard, fairlead or the like being thereby
prolonged, whilst the slipping action of the warp is diminished.
2. In a bollard, fairlead or the like, a barrel or roller having its working surface
furnished with renewable strips, such as a, and provided with collars, such as D, E,
the roller being reversible by making the collars of equal diameter so as to fit in
the recess at either end of the roller, substantially as herein described.
3. In mounting the barrel or roller of a bollard, fairlead or the like upon
anti-friction balls, the employment of a reversible collar, such as D), substantially as
and for the purpose set forth.
4. In a bollard, fairlead or the like, the employment of a collar, such as E, formed

page_text: oil-cup and serving to effect the lubrication of the working parts, substantially
as herein described.