Improvements in or relating to Lathe-chucks.
Year: 1895

page_text: Date of Application, 16th Apr., 1895
Complete Specification Left, 30th Dec., 1895-Accepted, 28th Mar., 1896
PROVISIONAL SPECIFICATION.
Improvements in or relating to Lathe-chucks.
SAMUEL HENRY HAMER Range Bank Iron Works Range Lane Halifax
Yorks Engineers Tool Maker and Machine Maker, do hereby declare the nature of
this invention to be as follows:-
The invention consists of cutting a suitable thread on the outer surface of the
loose collars which hold the regulating screws (these are the screws for moving the
jaws of chucks) of lathe-chucks in position, these collars to be kept from working
loose by means of pointed "grub screws," which pass through the body of the chuck
and enter suitable holes drilled to receive them, around the outer surface of each
collar; the holes in the chucks into which the collars fit, to have suitable threads
cut in them to allow the collars to screw in, and to be adjusted for any wear
which may take place.
Dated this 15th day of April 1895.
Improvements in or relating to Lathe-chucks.
SAMUEL HENRY HAMER Range Bank Iron Works Range Lane Halifax,
Yorkshire, Engineers' Tool Maker &c. 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 :-
The invention consists of cutting a thread on the outer surface of the loose
collars (a) which hold the regulating screws (b) in position (these are the screws
for moving the jaws of the chucks) these collars to be kept from working loose by
means of pointed "grub screws (c) which pass through the body of the chuck (d)
(into which the collars have been screwed) and enter suitable holes drilled around
the outer surface of each collar; the holes in the chucks into which the collars fit
to have suitable threads cut in them to allow the collars to screw in & to be adjusted
for any wear which may take place.
An advantage of this class of collar over those held in position by means of two
pegs or pins, is, that the thrust upon the collar, when working is sustained all
around its circumference, by means of the thread instead of only in two places by
means of the pins or pegs. Also that when necessary to remove or reverse the
jaws, it can be done more easily and quickly. Also as previously stated, the wear
on the surface of the collars can be "taken up". by screwing the collar (a) further
down on to the collar of the screw (b).
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. Boring a number of holes around the outer surface of the screwed or chased
collar (a) such holes to follow the course of the thread of the screwed collar, so

page_text: that as the collar is screwed further down, to take up any wear as it may occur
suitable holes present themselves opposite to the grub screw (c) in the back portion
of the body of the chuck, so that the grub-screw point can be screwed into the
hole in the collar to keep the collar from working loose.
Dated this 28th day of December 1895.
SAMUEL HENRY HAMER.