Improvements in Apparatus for Bending Rods, Bars, or Straps.
Year: 1895

page_text: Date of Application, 13th June, 1895
Complete Specification Left, 11th Mar., 1896-Accepted, 11th Apr., 1896
PROVISIONAL SPECIFICATION.
Improvements in Apparatus for Bending Rods, Bars, or Straps.
1, THOMAS PITCAIRN, of 21 Columba Place, Clydebank, in the County of
Dumbarton, Engineer, do hereby declare the nature of this invention to be as
follows:-
This invention has for its object the provision of simple and efficient apparatus
to be used for bending rods, bars or straps into circular form or through an arc of
a circle, and it is more especially applicable for bending straps used in making
water tight doors for bulkheads in ships, the corners of which doors are rounded
and the straps for which are commonly bent by hammering.
The improved apparatus comprises a centre block secured upon a sole plate or
framing and made up of a stepped disc or series of concentric discs or rings secured
together or made in a casting resembling a stepped cone pulley the discs being of
diminished diameters from the base upwards, and the whole terminating in a
central stud or spindle to which is attached a lever adapted to be turned around
the centre.
On this lever is fitted and adjustably or otherwise centred and secured another
stepped disc or series of discs corresponding in number and depth to the first and
inverted and so fitted in relation to it that a space is left between each pair
of discs to admit the rod, bar or strap to be operated on. The bending of the
rod, bar or strap is effected by passing it through one of the spaces between the
discs, securing the end by a clamp; and then turning the lever carrying the second
stepped disc, which is free to rotate, so as by rolling contact of the rotatable disc
to press the rod or strap around and in close contact with the periphery of the
stationary disc or ring whereby the rod or strap is bent around the arc of a
circle corresponding to that of any size of disc or ring chosen. After bending
a door strap to correspond to one corner of the door or door frame it is pushed
through the space between the discs, the rotatable disc being if necessary
withdrawn on its centre moved along a slot in the lever and then replaced, after
which the strap is bent at a suitable position to suit the next corner of the door.
Dated this 12th day of June 1895.
COMPLETE SPECIFICATION.
Improvements in Apparatus for Bending Rods, Bars, or Straps.
1, THOMAS PITCAIRN, of 21 Columba Place, Clydebank, in the County of
Dumbarton, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement :-
This invention has for its object the provision of simple and efficient apparatus
to be used for bending rods, bars or straps into circular form or through an arc of
Improvements in Apparatus for Bending US, DAINT
1, THOMAS PITCAIRN, of 21 Columba Place, Clydebank, in the County of
Dumbarton, Engineer, do hereby declare the nature of this invention and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This invention has for its object the provision of simple and efficient apparatus
to be used for bending rods, bars or straps into circular form or through an arc of

page_text: a circle, and it is more especially applicable for bending straps used in making
water tight doors for bulkheads in ships, the corners of which doors are rounded
and the straps for which are commonly bent by hammering.
The invention is illustrated by the accompanying drawings, Figure 1 being an
elevation and Figure 2 a plan of the improved apparatus, whilst Figs. 3 and 4 are
views at right angles to each other of a detail of the apparatus.
The improved apparatus comprises a centre block A secured upon a sole plate
or framing B and made up of a stepped disc or series of concentric discs or rings a
secured together or made in a casting resembling a stepped cone pulley the discs a
being of diminished diameters from the base upwards, and the whole terminating
in a central stud or spindle or being secured on a stud or spindle C to which is
attached a lever D adapted to be turned around the centre stud C.
On this lever D is fitted and adjustably or otherwise centred and secured at e
another stepped dise or series of discs E corresponding in number and depth to the
first, and inverted and so fitted in relation to it that a space F is left between each
pair of discs to admit the rod, bar or strap G to be operated on. The bending of
the rod, bar or strap G is effected by passing it through one of the spaces F
between the discs, securing the end by a clamp H in a manner hereinafter more
particularly described, and then turning the lever D carrying the second stepped
disc E which is free to rotate on its centre e, so as by rolling contact of the
rotatable disc to press the rod or strap G around and in close contact with the
periphery of the stationary centre block A whereby the rod or strap G is bent
around the arc of a circle corresponding to that of any size of disc or ring a
chosen. Any tendency to rise on the part of the stepped disc E is prevented by
the use of loose washers one of which bears on the periphery of the sole plate R
and the other on the under side of a lip 6 formed thereon. After bending
strap to correspond to one corner of the door or door frame it is pushed through
the space F between the discs a and E the rotatable disc E being if necessary
withdrawn on its centre e, moved along a slot d in the lever D and then replaced,
and secured by a pin d¹ passing through a plate D¹ and into the lever D, after
which the strap is bent at a suitable position to suit the next corner of the door.
The rod, bar or strap G is placed with one of its ends abutting against one of the
steps h formed in the clamp H, as shewn particularly at Figures 3 and 4, a wedge h¹
being used if necessary to prevent the bar or strap slipping down from the step
upon which it is intended to bear.
a door
The clamp H may be removed after one corner has been formed on the bar or
straps G and placed at the necessary distance on the opposite side of the centre
line of the lever to permit of the other corner being bent, the bar or strap being
secured to the clamp as already described.
The apparatus is also applicable for bending bars or straps in making rings for
manhole doors, deck hatches and for coiling pipe.
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed, I declare that what I
claim is :-
Apparatus composed of stepped discs constructed, arranged and operated as
described for bending rods, bars or straps.
Dated this 10th day of March 1896.
WALLACE FAIRWEATHER,
Chartered Patent Agent,
62 St. Vincent Street, Glasgow, Agent for the Applicant.