Chuck for Holding Glasses for Watches or Clocks.
Year: 1895

page_text: Date of Application, 31st Oct., 1895
Complete Specification Left, 31st July, 1896-Accepted, 31st Oct., 1896
PROVISIONAL SPECIFICATION.
A Chuck for Holding Glasses for Watches or Clocks.
FREDERICK INGHAM 29 Skinnergate Darlington Watchmaker and Jeweller
do hereby declare the nature of this invention to be as follows:-
A circular piece of rubber A hollowed out from the front is attached by means
of a screw C & washer J to a brass arbor B. The arbor B fits into the hollow H
of a brass spindle F. This spindle carries a slide D which is pushed forward
by means of a spiral spring G, a slot I is cut in the slide to allow passage for a
screw E which fixes the arbor B.
The end L of the spindle F is lapped so that it may be attached to a lathe or
the like.
The principal features of this invention are I. The application of the hollowed
out rubber A to which a glass may be fixed by pressing the glass to the face or
hollow of the rubber & II. The slide D which when the arbor carrying rubber A
is fixed in the spindle F, keeps the glass firm & flat.
Dated this day of 24th October 1895.
2
I, FREDERICK INGHAM, 29 Skinnergate, Darlington, in the County of Durham,
Watchmaker, 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 relates to chucks for bolding glasses, for watches or clocks, &
consists in means for effecting this, by the suction of a rubber valve, or concave
disc, against which is pressed, the surface of a watch or clock glass, thus leaving
the edge of the glass free. A cylindrical slide, working on the spindle which
carries the valve, keeps by means of a spiral spring, the glass when fixed to the
chuck by the valve, firm & flat.
An important feature is that, a glass adhering to the valve, may be quickly fixed
in or taken out of the chuck, & if the glass has been centred in the chuck this
may be done repeatedly without decentralizing the glass.
In the accompanying drawings
Fig. 1. is a longitudinal drawing of a chuck according to my invention, showing
valve, slide & part of spindle, in section.
Fig. 2. is a view of the same, but no part in section.
Fig. 3. a section of the spindle.
Fig. 4. is a section of the valve arbor.
Fig. 5. is a section of the rubber valve or cap.
A moulded concave rubber disc, A, the small centre hole of which fits on a
short projection or tube of the arbor, B, & is fixed to the same by the screw, C, a
thin metal washer being placed between the rubber & the screwhead to prevent the
rubber from being damaged thereby.

page_text: The head of the arbor, B, is undercut, so as to make the junction, of the rubber
& arbor perfectly airtight. These two pieces form what I have termed the valve,
I make the arbor of brass, but any suitable metal, or material to which the rubber
could be firmly fixed, could be used. I preferably make the head of the arbor
twice the diameter of its body or shank, thus giving a larger bearing surface, to
prevent the rubber from being cut, when screwed on. The arbor, B, fits into the
spindle F, & is fixed to it by means of a screw E, which projects through the
shell of the spindle into a groove at the end of the arbor B.
A cylindrical slide D, is fitted without side shake to & works on the spindle F.
The head of the slide projects beyond the spindle & the cavity is of such a form,
as to allow the rubber disc A, when it has a glass attached to it, being freely
inserted, so that the front edge of the slide head, can touch the glass. A spiral
spring G, round the spindle presses the slide D, forward. A slot 1, is cut in the
slide to allow a passage for the arbor screw, E, the slot is of such a form that,
the slide can be taken off the spindle without the screw, E, being removed.
The method of working the chuck is as follows:-
The chuck is fitted to a lathe mandril, by means of the screw, L, which is a
common way of fixing chucks (but there are other well known ways by which the
chuck could be fixed equally as well).
The valve is taken out by releasing the screw, E, the surface of a glass is placed
over the hollow or cavity, of the rubber valve & firmly pressed so as to exclude the
air out of the cavity, when that is done the glass will adhere to the rubber. The
valve is then inserted in its place in the chuck, & it will be necessary to cause
the glass to push the slide, D, back so that the arbor screw can be screwed down,
into the groove at the end of the arbor to fix it.
A glass can be easily centred by revolving the chuck in the lathe, (with the
glass attached) & at the same time placeing your thum on the rest of the lathe
& applying sufficient force to the edge of the glass to cause it to slide on the
rubber valve into the centre.
If the object is to reduce the diameter of the glass this may be done by applying
an emery file to the edge of the glass, & the operation can be tested from time
to time by releasing the arbor screw & taking glass & valve complete out of the
chuck,
Having now particularly described & ascertained the nature of my said
invention & in what manner the same is to be performed, I declare that what I
claim is
1. A chuck for holding glasses of watches or clocks in which the glass is held
to the chuck by means of a vacuum formed in the interior of a cap or valve
formed of rubber or other like material, substantially as described & shown.
2. A chuck for holding glasses for watches or clocks, by the use of which the
glass with the valve attached, may be taken out of the chuck, without seperating
the glass from the valve, substantially as described & shown.
3. A chuck for holding glasses for watches or clocks, consisting essentially of a
spindle, a spring slide connected to the same & an elastic valve or cap, substantially
as described & shown.
4. A chuck for holding glasses for watches or clocks, constructed & operating
substantially as described & shown.
Dated this 29th day July 1896.
FREDERICK INGHAM.