Improvements in Clamps for the Holding of Glass Plates during Bevelling, Polishing and the like.
Year: 1898

page_text: Date of Application, 6th Dec., 1898
Complete Specification Left, 2nd Sept., 1899-Accepted, 28th Oct., 1899
AUDIONAUTICATION.
Improvements in Clamps for the Holding of Glass Plates during
Bevelling, Polishing and the like.
I, JONATHAN HULLS, of The Cedars, Frederick Road, Stechford, near the City of
Birmingham, Manager of Works, do hereby declare the nature of this invention
to be as follows:-
This invention has relation to clamps or apparatus for holding together a
number of glass plates, set at a given angle, during the operation of collectively
bevelling the edges of the same by grinding and also during the polishing of such
bevelled edges, or otherwise operating upon the same, and has for its object
principally, to provide a clamp which admits of being held and used by hand,
although it is to be understood that the same may be used in connection with a
bevelling machine or otherwise mechanically.
In carrying out one form of my invention in connection with a clamp adapted
to be used in hand bevelling, I take a base framing or plate, of suitable length,
according to the number of glass plates to be accommodated and I provide at each
end of the same, a rest or bracket, which is set at the same inclination as that in
which the plates have to be held in order to produce the desired bevel, whilst
arranged at or about the middle of the apparatus, is a wedge or force block, the
two ends of which, are opposed to and bevelled to the same inclination as, the
inclined rest brackets. This clamping block is strung upon a headed stalk which
passes through a hole in the base plate and is fitted on the underside with a
nut, spring, cam or other lever or other mechanical means, or combination of
means for drawing the said clamping block inwards.
When in use, a number of glass plates to be bevelled are arranged in two
oppositely inclined series between the opposed surfaces of the end rest brackets
and middle clamping block and then on the said block being drawn down by
operating the screw nut, lever or the like in connection with the stalk, the said
plates are securely clamped and held for and during bevelling, or during the
polishing of the bevelled edges.
The clamping wedge block has preferably a slight play or freedom of movement
upon the stalk so as to admit of it giving to one side or the other in the event
of any variation in thickness or in number of the two series of plates.
Instead of the rest brackets inclining in opposite directions and employing
in conjunction therewith, a clamping block correspondingly inclined at both ends,
I may arrange for the two series of plates to rake in the same direction by provid-
ing one inclined rest at the end of the base and another one or others in the
middle, whilst the opposite end of the base forms a stop or bearing for one of the
clamping blocks, of which a separate one, with its stalk and operating means is
employed in connection with each series of plates. Each block is preferably
of a triangular figure, with its flat side taking a bearing against the straight back
of one of the rests, or against the end stop, as the case may be, whilst the other
and inclined surface bears upon the contiguous glass plate of the series to be
clamped and held by it.
The base framing or plate may be of a boxed construction, or have fixed or

page_text: The
adjustable side stops to prevent the lateral displacement of the plates.
inclined rests may also be adjustably connected to the base for accommodating
varying numbers of plates.
.
For the convenience of the operator, the bottom or base of the clamp may be
provided with suitable grips for the hands.
Data
1000
JONATHAN HULLS.
By Henry Skerrett,
Agent for Applicant.
Improvements in Clamps for the Holding of Glass Plates during
Bevelling, Polishing and the like.
I, JONATHAN HULLS, of The Cedars, Frederick Road, Stechford, near the City of
Birmingham, Manager of Works, 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 has relation to clamps or apparatus for holding together a
number of glass plates, set at a given angle, during the operation of collectively
bevelling the edges of the same by grinding and also during the polishing of such
bevelled edges, or otherwise operating upon the same, and has for its object
principally, to provide a clamp which admits of being held and used by hand,
although it is to be understood that the same may be used in connection with a
bevelling machine or otherwise mechanically.
Figure 1 of the accompanying drawings represents, partly in side elevation
and partly in longitudinal vertical section, one form of clamping apparatus con-
structed according to my invention.
-
Figure 2 is a topside plan of the same with the glass plates removed, whilst
Figure 3 represents an end view.
In carrying out this form of my invention in connection with a clamp
adapted to be used in hand-bevelling, I take a base framing or plate a, of suitable
length, according to the number of glass plates b, to be accommodated and I
provide at each end of the same, a rest or bracket c which is set at the same
inclination as that in which the plates have to be held in order to produce the
desired bevel, whilst arranged at or about the middle of the apparatus, is a wedge
or force block d, the two end faces d', of which, are opposed to and bevelled to the
same inclination as the opposed inclined faces c¹, of the rest brackets. This clamp-
ing block is pivoted or swivelly connected at d, to a stalk or pull bar e, which
passes through a hole a¹ in the base plate and is fitted on the underside with a
spring f, encircling the said stalk, with its one end f¹, bearing against the under-
side of the bed plate and its other end f taking a thrust against the head or
terminal enlargement of the stalk, so that the expansion of the spring tends
to draw the wedge clamping block downwards and automatically clamp or bind
a double series of glass plates between it and the inclined rest brackets c. The
spring and stalk are enclosed in a sleeve g, the lower end of which is cross-gapped
at g', and has pivoted to it at g², a cam-ended lever h, with its acting or cam end h¹,
bearing underneath the end of the pull bar depending from the clamping block.
Thus, when the apparatus is in use, the glass plates to be bevelled are arranged
in two oppositely inclined series between the opposed surfaces of the end rest
brackets and middle clamping block and then on the lever h being turned into
such a position as that represented in Figure 1, the spring f is permitted to act
upon the stem, and the block is drawn down between the said plates, which are

page_text: securely clamped and held for and during bevelling, or during the polishing of
the bevelled edges. Then when the operation is completed the plates are relieved
by turning the lever h, in a position at right angles to that shown thus raising the
stalk or pull bar with the wedge block by the action of the cam end h', and
compressing the spring.
The clamping wedge block is pivoted or swivelly connected to its stalk in order
to permit of it having a slight play or freedom of movement thereon, for the
purpose of allowing the block to slightly yield or give to one side or the other in
the event of any variation in thickness or in number of the two series of plates
Figure 4 represents, partly in elevation and partly in section, a modification of
my apparatus, in which the clamping block is drawn into its operative position by
a screw instead of by a spring.
Figure 5 is an end view of this form of the apparatus.
a is the base of bed plate, b the two series of plates to be held, and c are the
inclined rest brackets, whilst d is the middle clamping block, which has inclined
faces whose angle is the same as those of the end abutments, and is swivelly
connected at da, to the inner end on an operating screw e, working and rising and
falling to raise or lower the clamping block, within a screw box f, formed in the
base or frame of the apparatus.
Instead of using rest brackets inclined in opposite directions, in conjunction
with a middle clamping block correspondingly inclined at both ends, I may
arrange an apparatus as represented in Figure 6, wherein the two series of plates b
rake in the same direction. This is effected by providing one inclined rest c¹, at
the end of the base a and another one (or others) in the middle, whilst the
opposite end of the base forms an abutment stop or bearing a³, for one of the
clamping blocks d, of which a separate one, with its stalk d₁ and nut d³, or other
operating means, is employed in connection with each series of plates. Each
block is preferably of a triangular figure, with its flat side taking a vertically
sliding abutment against the straight back a', of one of the rests, or against the
end stop a³, as the case may be, whilst the other and inclined surface d³, bears
upon the contiguous glass plate of the series to be clamped and held by it.
The
The base framing or plate may be of a boxed construction, or have fixed or
adjustable side stops to prevent the lateral displacement of the plates.
inclined rests may also be adjustably connected to the base for accommodating
varying numbers of plates.
For the convenience of the operator, the bottom or base of the clamp may be
provided with suitable grips for the hands.
Instead of drawing the clamping blocks into their acting positions by springs,
as in Figures 1 to 3, a swivelling screw and screw box, as in Figures 4 and 5, or
screws and nuts as in Figure 6, I may use for this purpose a cam-ended lever,
excentric or other mechanical device or combination of mechanical means whereby
the same result may be attained.
Having now particularly described and ascertained the nature of my said
invention, and in what manner the same is to be performed, I declare that what
I claim is:-
First In clamps for holding glass plates at a determined angle during
bevelling, polishing and the like, the employment of a wedge-shaped clamping
block made to approach to or retire from the bed or base, in combination with
inclined rests or brackets arranged in the same angle as the overhanging sides
or faces of the block, which is drawn into its operative position either by a spring
as in Figures 1 to 3, or by a swivelling screw as in Figures and 5, or by a cam
or other mechanical means, substantially as described and set forth.
Secondly-In clamps for holding glass plates at a determined angle during
bevelling, polishing and the like and having a wedge-shaped clamping block
and inclined rest brackets as in the preceeding claim, swivelly mounting the said
clamping block to its stalk or pull bar, substantially as and for the purpose
described and set forth.

page_text: Thirdly In clamps for holding glass plates at a determined angle during
bevelling, the combination with a clamping block having inclined sides and drawn
into its acting position by a spring, of a lever having a cam-end acting upon the
stalk of the block for raising the said block and relieving the pressure of the
spring, substantially as and for the purpose described and set forth.
.
Fourthly: In clamps for holding glass plates at a determined angle during
bevelling, polishing and the like, the employment of clamping blocks the clamp-
ing face of which is inclined to the same angle as inclined rest or bracket, whilst
the other face has a sliding abutment against a part of the framing or base of the
clamp, with the said block being drawn down into its operative position by a
screw as in Figure 6, or by a spring, cam or other means, substantially as described
and set forth.
1000
JONATHAN HULLS.
By Henry Skerrett,
24, Temple Row, Birmingham, Agent for Applicant.