Improved Compass or Drawing Instrument.
Year: 1895

page_text: Date of Application, 15th Mar., 1895
Complete Specification Left, 26th Nov., 1895-Accepted, 28th Dec., 1895
PROVISIONAL SPECIFICATION.
Improved Compass or Drawing Instrument.
I, JOHN WILDAY of Bond Street Birmingham, in the County of Warwick,
Mathematical Instrument Maker, do hereby declare the nature of this invention
to be as follows:-
My invention has for its object to provide a compass that will hold a pencil of
practically any size in a perfectly rigid manner, the parts of the compass holding
the pencil being capable of an easy and speedy adjustment to suit the size of the
pencil.
I provide one of the compass splints with a bracket the back of which is
preferably slightly hollowed to afford a backing or seating for the pencil to rest
against.
In this bracket a screw with a milled head is held and turns, and I make this
screw serve to bring a band or clip nearer to or further from the back of the
bracket, this band or clip it will be understood surrounds the pencil. The ends of
the band or clip may move directly on the screw, or I may provide the screw with
a small slide moving in grooves in the bracket and let the ends of the band or clip
take on to little pivots on the sides of the slide.
1 prefer to cut out an oval or other shaped piece in that part of the band or clip
bearing on the pencil as I believe by that means a firmer grip is obtained.
It will be understood that the screw does not screw up and down in the bracket,
it simply turns in its bearings therein, and is thus the means of causing the band
or clip, which is either directly or indirectly connected to it, to approach to or
recede from the bracket and so an opening corresponding to the size of the pencil
is provided. When the pencil has been inserted in the compass the milled head
can be further turned and so the band or clip be brought down and hold the pencil
perfectly rigid.
In place of a screw I may make use of a spiral spring or springs inserted in the
bracket and directly or indirectly attach the band or clip to such spring or
springs.
The ends of the band or clip are attached to a small thumb piece. The spring
or springs will always hold the band or clip close to the back of the bracket and
when a pencil is to be inserted the thumb piece is pressed upon causing the band
or clip to move away from the bracket.
Birmingham, March 14th 1895.
W. P. THOMPSON & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Compass or Drawing Instrument.
1, JOHN WILDAY of Bond Street, Birmingham, in the County of Warwick,
Mathematical Instrument Maker, 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 an improved compass or instrument to be used in
drawing and has reference to that class of instrument known as a bow lead, and the

page_text: object of this invention is a means whereby the lead is fitted to the splint of the
compass in a manner allowing of an easy and speedy adjustment, and also that
the said lead shall be held perfectly rigid, or in a dead grip.
The means consist essentially of a traversing band, ring, or like clip adapted to
embrace the pencil of the compass and which said band, ring, or like clip is
connected either directly or indirectly by a screw, screw box, or its equivalent, to a
screw nut, screw pin, or its equivalent, fitted and arranged within the enlarged part
of the splint or short leg of the compass, provided with a seating for the said lead,
and within and between which said seating and the clip as aforesaid the pencil is
held perfectly rigid or in a dead grip.
Fig. 1 of the accompanying sheet of drawings represents in elevation a lead bow
compass, whose short leg or splint is fitted and arranged with a means for rigidly
holding lead or its equivalent according to one form of my invention.
Fig. 2 represents on an enlarged scale a portion of the short leg or splint of the
compass, Fig. 1, the enlarged end of which is broken into and shown in section
illustrating a pencil grip constructed according to this first form of my invention.
Fig. 3 is an exaggerated horizontal section of Fig. 2 taken through the gripping
means and on the dotted lines a.
The same letters of reference indicate corresponding parts in the several figures
of the sheet of drawings.
a is a compass consisting of a long leg a², short leg or splint a³, jointedly
connected together at a', and which said long leg a² is needle-pointed in the usual
manner. The short leg or splint a has an enlarged part or bracket extension a³,
having formed on its outside edge at a grooved channel or seating a', and also a
middle piercing or clearance a³, for the purposes hereinafter described.
Fitted and working horizontally within bearings a°, a10, formed in the middle of
the enlarged part of the bracket a, as aforesaid, and also centrally with the piercing
or clearance a³, is a screw b consisting of a milled head 62, and a screwed shank b³,
adapted to carry and traverse backwards and forwards a band clip c, whose
ends, overlap each other and are formed into a screw box c', which engages
with a screwed shank of the screw b, and which said band clip c has a cut-away
part, and sides or cheeks c, c².
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d is a lead pencil or its equivalent seating itself in the vertical groove or channel a'
of the enlarged part a. as aforesaid, and being pressed or pulled into the same by
the gripping parts c³, c, of the traversing band clip through the medium of the
screw b, as before described, and which said lead pencil or its equivalent is firmly
held in a dead grip between the seating a' and the gripping parts c³, c³, of the
traversing clip.
It is understood that the screw b has no other movement than a rotary one, and is
affixed in position by the metal at the end of the shank being slightly swelled which
prevents it coming out of its place.
The clip c I prefer to make from a sheet metal blank, and turn the ends
inwards and one upon the other to form a screw box to engage the said screw, as
before described.
Fig. 4 represents a slightly modified form of the arrangements just described and
referred to in Figs. 1, 2, and 3.
Fig. 5 is an exaggerated horizontal section upon the dotted line a², Fig. 4, and
Fig. 6 is an elevation of Fig. 4.
In this modification the band clip is jointedly carried on a traversing nut or screwed
box working on and by a screw alike to the one before described.
a³ is the short leg or splint having an enlarged part or bracket extension a³,
provided with a pencil seating a' on its outside edge a, and also a middle piercing or
clearance, provided with a screw b, having a screwed shank 6, and within and on
which a nut or screwed box c works.
This said nut or screwed box has outstanding horns or pivots c², c³, taking
through piercings clo, c", formed within the cheeks or free sides c, c7, of the band
clip c, and which said nut or screw box is adapted, through the medium of the

page_text: screw b, to traverse backwards and forwards the band clip, as aforesaid, and so
affix the lead pencil or its equivalent between the said clip and the seating on the
extension.
Fig. 7 represents another form of my invention, and Fig. 8 is a horizontal
section on the dotted lines a³, Fig. 7.
In this arrangement I make the clip in the form of a ring or eye having integral
with it a screwed shank, and which said ring clip or eye is fitted horizontally
within the enlarged part of the short leg or splint of the said compass, and
adapted to be traversed back and forth by a rotary screw nut, confined within the
limits of a cut-away part in the enlargement of the splint or short leg as
aforesaid.
a is the short leg or splint having an enlargement a, whose outside edge a is
vertically sunken or recessed to form a seating for a pencil d or its equivalent.
c is a ring clip consisting of an eye c, and a screwed shank c³, fitted horizontally
within the middle of the enlargement a' of the short leg or splint a³, whilst b is a
screwed nut whose outside edge is milled and which said screw nut is disposed
crosswise or at right angles to the ring clip c, and carried on the screwed shank
thereof, and confined within the limits of a cross clearance a³, cut within the
enlargement part a³.
It will be seen that from Figs. 7 and 8 the pencil d is threaded through the
eye of the ring clip c, and by the rotation of the screw nut 6 the ring clip is
made to approach or recede from the seating in the enlarged part a³, and thus
bring the pencil on to the said seating and firmly hold the same in a dead grip.
Fig. 9 represents another modified form of my invention in which a spring is
used as the medium for traversing the clip and gripping and holding the lead
pencil.
a is the leg or splint, as the enlarged part, as the middle piercing therein,
whilst a is a groove or channel seating on the outer edge a, of the enlarged
part a³.
c is a band clip provided with a cut-away part c³, gripping parts c³, c³, and an
abutment end c², fitted with a pusher c³, and between which said abutment end c³,
and one of the faces a of the clearance a³, a spring 6 is disposed, and which said
spring causes the clip c to firmly hold the pencil between the seating a' and the
gripping parts & c.
It will be seen that when it is required to adjust or release the pencil it is only
necessary to press the pusher c³, which compresses the spring and takes the gripping
parts c, c, from contact with the pencil, but, after adjustment, on again releasing
the said pusher the pencil is automatically and firmly held.
I wish it to be observed that in all the arrangements described an easy and
speedy adjustment of the said pencil or its equivalent is effected, and also that, if
necessary, the enlarged or extended part a' may, instead of being solid, be formed
from sheet metal, and further that instead of a lead pencil a pen or needle point
can be fitted by the same means, or a needle point may be fitted to one leg and a
pen or pencil to the other leg.
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 :-
First. In bow compasses or drawing instruments, effecting the rigid attachment
of a pencil, pen, or its equivalent to one or both of the legs or splints by a traversing
or back and forth moving band, ring, or like clip, operated by means of a screw
nut and a screw substantially as described and set forth.
Second. In bow compasses or drawing instruments, providing one or both of the
legs or splints with an enlarged or extended part as, fitted with a seating a', a
middle piercing or clearance as, a rotating screw b, and a traversing or back and
forth moving band clip c, fitted with a screw box c', for the purpose substantially
as described and set forth in Figs. 1, 2, and 3.

page_text: Third. In bow compasses or drawing instruments, providing one or both of the
legs or splints with an enlarged or extended part a³, fitted with a seating a', a
middle piercing or clearance a³, a rotating screw b, and a traversing or back and
forth moving band clip c, jointedly fitted to a traversing screw box c, for the
purpose substantially as described and set forth in Figs. 4, 5, and 6.
Fourth. In bow compasses or drawing instruments, providing one or both of the
legs or splints with an enlarged or extended part a', having a seating a', a cross
clearance a³, a horizontal clearance, and also a traversing or back and forth
moving ring clip c, fitted with an eye c², a screwed shank c, and a screwed nut b,
for the purpose substantially as described and set forth in Figs. 7 and 8.
Fifth. In bow compasses or drawing instruments, fitting one or both of the legs
or splints with a seating a', a clearance a³, and a traversing back and forth moving
band clip c, provided with a pusher c³, and a spring b, for the purpose substantially
as described and set forth in Fig. 9.
Sixth. The general arrangement, combination, and fitting of the parts substan-
tially as described and set forth in Figs. 1 to 9.
Dated this 23rd day of November 1895.
W. P. THOMPSON & Co.,
Of 11, Burlington Chambers, Birmingham, Agents for the Applicant.