Improvements in Machines and Appliances for the Manufacture of Furniture Castors.
Year: 1895

page_text: Date of Application, 30th Aug., 1895
Complete Specification Left, 30th May, 1896-Accepted, 15th Aug., 1896
PROVISIONAL SPECIFICATION.
Improvements in Machines and Appliances for the Manufacture of
Furniture Castors.
I, FREDERICK JOHN BURRELL of St. Nicholas Works, Thetford in the
County of Norfolk, Engineer, do hereby declare the nature of this invention to be
as follows:-
This invention relates to machinery specially suitable for the manufacture of
furniture castors wherewith the various machining operations can be expeditiously
and accurately performed. The hereinafter described appliances are more
especially suitable for the manufacture of ball bearing castors consisting of two
principle parts viz. the upper portion or cup and the lower portion or forked base
such as described in my Patent No. 2569 1893. For this purpose I utilize a form
of lathe having two heads one of which is fitted with double pulleys and a
reversing clutch between for both cutting and tapping. The other head carrying
a single pulley and used for driving only. A traversing saddle carrying a slide
rest provided with jaws which are tightened by a right and left hand threaded
screw or other suitable means, holds the work whilst being machined. These jaws
being fitted with interchangeable faces arranged to fit the castings hold same
firmly and accurately in position for machining. The traverse of the saddle is
limited by adjustable stops. The casting is brought up to first one and then the
other of two revolving cutters. A cross drilling attachment is provided for
drilling the holes in the lower portion of the forks to carry the roller so that this
operation is performed at the same fixing. The machining of the cups is
performed by their being held in self centering jaws upon the slide rest and
moved in one direction against a revolving cutter which drills and machines the
lower portion. The cup is then brought up to a tap fixed to a sleeve driven by
the reversing head and is rapidly tapped to receive the central screw by which
the upper and lower portions of the castor are held together. The turning of the
outside of the cups is performed by fixing the cup upon a taper mandril formed
with teeth by which the cup is driven and held firmly by a back centre carried on
the saddle.
Flat forming cutters with edges corresponding in outline to the cup, are attached
firmly to the jaws of the slide rest. The cutting edge of one being above and the
other below the centre. They are brought together by the right and left hand
thread and operate upon the outside of the cup whilst the same is revolving.
Dated this 29th day of August 1895.

page_text: Fig. 5, is a plan of the gripping jaws arranged to hold the work in position for
three operations, viz.: cross drilling and machining on both sides.
Figs. 6, and 7, show the attachment for cross drilling both sides being operated
by one lever.
Fig. 8, shows the work held in position by gripping jaws whilst one end end is
machined and drilled and afterwards tapped in position.
For the purpose of carrying my invention into practice I utilize a form of lathe
having two heads one of which is fitted with double pulleys a (for driving the
tapping) and a reversing clutch between for both cutting and tapping. The other
head carrying a single pulley o and used for driving a drill and shaping tool.
A traversing saddle carrying a slide rest provided with jaws a which are tightened
by a right and left hand threaded screw bor other suitable means, holds the work
whilst being machined. These jaws a being fitted with interchangeable faces c
arranged to fit the castings bold same firmly and accurately in position for
machining. The traverse of the saddle a' is limited by hardened adjustable stops s.
The casting is brought up to first one and then the other of two revolving cutters r.
A cross drilling attachment mounted on the saddle a' (see Figs. 6, and 7,) is
provided for drilling the holes in the lower portion of the forks as shown in Fig. 5,
to carry the roller so that this operation is performed at the same fixing. The
machining of the cup is performed by its being held in self centering jaws cc (see
Fig. 8,) upon the slide rest or saddle a¹ and moved in one direction against
a revolving cutter mounted in the spindle carrying the pulley o, which drills and
machines the lower portion. The cup is then brought up to a tap t fixed to a
sleeve w driven by the reversing head and is rapidly tapped to receive the central
screw by which the upper and lower portions of the castor are held together. The
turning of the outside of the cups is performed by fixing the cup upon a taper
mandril m mounted in the spindle carrying the pulley o as shown in Fig. 4, formed
with teeth by which the cup is driven and held firmly by a back centre n carried
on the saddle a'. Flat forming cutters f with edges corresponding in outline to
the
cup, are attached firmly to the jaws a of the slide rest. The cutting edge of
one being above and the other below the centre. They are brought together by

page_text: the right and left hand thread b and operate upon the outside of the cup whilst the
same is revolving.
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:-
1. In a machine for the manufacture of furniture castors, the combination of
interchangeable self centering gripping jaws to hold the work whilst being.
operated upon by revolving cutters as shown in Fig. 5, and provision for drilling
at the same fixing by means of the device as illustrated in Figs. 6, and 7, and
substantially herein described.
2. In a machine for the manufacture of furniture castors, the combination of
interchangeable self centering gripping jaws to hold the work whilst being operated
upon by revolving cutters and provision for drilling and tapping at the same fixing
by means of the device, substantially as herein described and according to Fig. 8,
of the accompanying drawings.
3. In a machine for the manufacture of furniture castors, the combination of
the various parts to form the construction in general of the lathe and arrangement
whereby the operations described are carried out, substantially as herein described
and according to the accompanying drawings.
4. In a machine for the manufacture of furniture castors, the combination of
the traversing saddle with interchangeable jaws for carrying the work against
revolving cutters and the hardened adjustable stops for fixing the amount of
travil of same, substantially as herein described and according to the accompanying
drawings.
Dated this 30th day of May 1896
J. P. BAYLY,
18 Fulham Place, London, W., Agent for the Applicant.