IMPROVEMENTS IN THE CONSTRUCTION OF PICKING SCROLLS, OR TAPPETS FOR LOOMS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
We HUMPHREY BRACEWELL and JOHN BULCOCK Machinests, and CHARLES
SMITH Manager, all of Burnley in the County of Lancaster, do hereby declare
the nature of our said invention for "IMPROVEMENTS IN THE CONSTRUCTION OF
PICKING SCROLLS, OR TAPPETS FOR LOOMS," to be as follows:-
This invention relates more; particularly to the "over pick motion," and consists
in constructing the shell with a projecting bevelled rim, which entirely surrounds
the circumference of the shell, and corrisponds with the bevelled surface of the
tappet bowl, whilst the nose bit or tappet point is recessed, so as to be capable of
sliding on the rim. The nose bit and shell are each corrugated or toothed, and
slotted, for setting or regulating the motion sooner or later as the loom may
require; and finally secured by bolts which pass through the slots. The tappet
shell and boss may be cast together or otherwise as may be deemed expedient. By
this arrangement the tappet shell is considerably strengthened, and a more efficient
means of adjustment ensured.

page_text: COMPLETE SPECIFICATION,
We, HUMPHREY BRACEWELL and JOHN BULCOCK, Machinests of Trafalgar
Street Iron Works, and CHARLES SMITH, Manager, all of Burnley, in the County
of Lancaster, do hereby declare the nature of our invention for "IMPROVEMENTS
IN THE CONSTRUCTION OF PICKING SCROLLS OR TAPPETS FOR LOOMS" and in what
manner the same is to be performed, to be particularly described and ascertained
in and by the following statement:-
This Invention of improvements is designed to add strength and durability to
the parts composing the tappet or scroll; and for the prevention of the parts
slipping or becoming disarranged, which is now so frequently the case with shells
and nose-bits of picking scrolls of the ordinary construction.
The devices and arrangements by which these ends are accomplished consist in
casting the shell of the tappet or scroll with a projecting rim, the continuity of
which completely encircles and strengthens the shell; also in forming the nose-bit
or tappet point with a recess to clip the rim, and upon which it is capable of
sliding whilst being adjusted; and also in forming serrated surfaces on the nose-
bit and shell; the form of which serrations we would recommend to be similar to
the teeth of a coarse file; the serrations on the surface of the shell, whilst
engaging with those of the nose-bit or tappet point, prevent the possibility of
separating rotatively, when bolted together. Suitable slots are formed in the shell
to allow the nose-bit to be moved backwards or forwards, one tooth or more of the
serrated surfaces to time the motion.
And in order that our said invention may be properly understood and readily
carried into operation, we have hereunto attached the accompanying sheet of
drawings, reference being had to the figures and letters marked thereon; the same
letters referring to the same parts in all the views and figures.
Fig. 1 represents a picking scroll or tappet constructed in accordance with our
invention.
Figs. 2 and 3 are respectively detached views of the shell and nose-bit, which
compose the scroll or tappet, and Fig. 4 is an edge view in section of Fig. 1.
2
A is the shell constructed with a bevel rim B, which projects into the recess J of 3
the nose-bit or tappet point C; D is the boss or coller, by which the shell is
secured to the tappet shaft. For the prevention of the parts A and C shifting
rotatively, when fixed, they are each provided with a serrated surface represented
by E and F, which engaging with each other, defy the possibility of separation,
when drawn together by bolts G.
Slots H are provided in the shell, so as to allow the nose-bit to be moved
backwards or forwards, one tooth or more on the serrated surfaces E and F to
regulate the motion.

page_text: Having now particularly described and ascertained the nature of our said
invention, and in what manner the same is to be performed, we declare that what
we claim is.
Firstly, constructing picking shells with an endless rim B, which projects into
the recess J of the nose-bit C, as described and set forth.
Secondly, providing the nose-bit and shell with the serrated surfaces E and F,
substantially as described for the purposes specified.
THOMAS RICHMOND,
Agent for the Patentees.