Year: 1888

page_text: Date of Application, 3rd July, 1888
Complete Specification Left, 3rd Apr., 1889
Complete Specification Accepted, 1st June, 1889
I WILLIAM AUGUSTUS KENNEDY GOSTLING of Cathay, Ealing Common, in the
County of Middlesex, Gentleman, do hereby declare the nature of this Invention
to be as follows:-
My invention relates to improvements in the construction of the instrument or
device known as a "Reciprocator," and used in conjunction with the spiral apparatus
on ornamental turning lathes. The "Reciprocator," as ordinarily made, consists of
an eccentric fitted on the intermediate arbor of the spiral apparatus, the outer end
being connected to one of the holes in a series of holes formed in an arm, or lever,
connected to the dividing chuck on the lathe mandrel.
By this means a partial to and fro rotation is given to the mandrel, and the
straight line motion of a tool in the slide rest is caused to cut a wave line on the
material being operated upon in the lathe. The depth of the wave is varied according
to which hole in the said arm is employed, and it has been customary to vary the
stroke of the eccentric by providing two or more holes in the sheave or bush of
the eccentric of varying and opposite eccentricity, to fit upon the aforesaid intermediate
arbor so that the depth of the wave can also be varied by this means and the direction
of the waves changed.
According to my invention I dispense with the said holes in the sheave and form
a transverse slot in it passing through the centre. A bush is fitted to slide in this
slot and is bored to fit on the intermediate arbor aforesaid. The bush is moved in
the slot by a micrometer screw arrangement, a suitably divided scale being marked on
the eccentric. The main advantages of this construction are that the stroke of the
eccentric can be varied or reversed by merely rotating the micrometer screw, and
without disturbing any part of the apparatus, whereas in the ordinary plan the
change wheels have to be disconnected and the eccentric taken off and replaced or

page_text: turned half round by hand, an operation of much delicacy; also that an increased
depth of wave can be obtained and that by gradually shifting the eccentric after each
light cut one division of the scale, the wave in a pattern can be expanded or flattened
in a manner not obtainable by the old method of using the holes in the lever arm
aforesaid.
Although my invention is described as applied to what aro known as ornamental
lathos, its use is not necessarily confined to inthes of that class.
AMBROSE MYALL,
21, Cockspur Street, S.W.,
Agent for the Applicant.

page_text: I, WILLIAM AUGUSTUS KENNEDY GOSTLING, of Cathay, Ealing Common, in the
County of Middlesex, Gentleman 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:-
My invention relates to improvements in the construction of the instrument or
device known as a "Reciprocator," and used in conjunction with the "spiral apparatus"
on ornamental turning lathes. The Reciprocator as ordinarily made consists of an
eccentric fitted on the intermediate arbor of the "spiral apparatus," the outer end of
the eccentric rod or arm being connected to one of the holes in a series of holes formed
in an arm or lever fastened on the lathe mandrel or on the dividing chuck of the
spiral apparatus, which is placed on the lathe mandrel. By this means when the
screw of the slide-rest is revolved, a partial to and fro rotation is given to the mandrel,
and the straight line motion of a tool in the slide-rest is caused to cut a wave line on
the material being operated upon in the lathe. The depth of the wave is varied
according to which hole in the aforesaid arm is employed, and it has been customary
to vary the stroke of the eccentric by providing two or more holes in the sheave or
bush of the eccentric of varying and opposite eccentricity to fit upon the aforesaid
intermediate arbor, so that the depth of the wave can also be varied by this means,
and the direction of the waves changed.
The accompanying drawing represents in elevation, a reciprocator constructed in
accordance with my invention. A is the eccentric or sheave fitted on the intermediate
arbor of the spiral apparatus, B is the eccentric rod or arm, connected by means of the
pin C to one of the holes in the arm or lever D, which said arm is provided with an
opening D' for fixing on the lathe mandrel. I dispense with the before mentioned
holes in the eccentric A and in place thereof 1 form a transverse slot E therein, passing
through the centre. A bush F is fitted to slide in this slot and is bored to fit either
on the intermediate arbor aforesaid or on a sleeve fitting the said arbor. The bush F
is moved along the slot E by a micrometer screw H, which passes through a tapped
hole in a lug on the eccentric A and revolves in bearings K, K¹, fixed to the bush.
The projecting ends of the screw are squared to enter a key, by which it is operated.
A suitably divided scale L is marked on the eccentric A and a pointer M is fixed to
the lug J, to indicate the amount of eccentricity given to the bush F.
The main advantages of this construction are that the stroke of the eccentric can
be varied or reversed by merely rotating the screw H, and without disturbing any
part of the apparatus, whereas in the ordinary plan the change wheels have to be dis-
connected and the eccentric taken off and replaced, or turned half round by hand, an
operation requiring great delicacy of manipulation to avoid disturbance of adjustment
of the spiral apparatus. Again an increased depth of wave can be obtained, and also

page_text: by gradually shifting the eccentric after each light cut, one or more divisions of the
scale, the wave in a pattern can be expanded or flattened in a manner not obtainable
by the old method of using the holes in the arm D.
Although my invention is described as applied to what aro known as
lathes," its use is not necessarily confined to lathes of that class.
* ornamental
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. A "Reciprocator" for use in combination with the spiral apparatus of a turning
lathe, having a bush fitted to slide in a transverse slot in the eccentric or sheave, and
oporated by means of a screw, substantially as herein set forth.
2. A "Reciprocator" for use in combination with the spiral apparatus of a turning
lathe, having a bush F fitted to slide in a transverso slot E in the eccentric or shoave A,
and operated by means of a micrometer screw E, with a divided scalo L and pointer M.
substantially as heroin set forth with reference to the accompanying drawings.
13
oor udyr 10 Can Do A
AMBROSE MYALL,
21, Cockspur Street, London, S.W.,
Agent for the Applicant.
AMBROSE MYALL,
21, Cockspur Street, London, S.W.,
Agent for the Applicant.