Improvements in Scribing Blocks and Caliper Gauges and the like.
Year: 1894

page_text: Date of Application, 16th May, 1894
Complete Specification Left, 15th Feb., 1895-Accepted, 27th Apr.,
1895
PROVISIONAL SPECIFICATION.
Improvements in Scribing Blocks and Caliper Gauges and
the like.
I, GEORGE ALEXANDER WOOD, of No. 1 Twyford Street, Caledonian Road,
London, in the County of Middlesex, Engineer do hereby declare the nature of this
invention to be as follows:-
An improved combination vernier and micrometer scribing block and caliper
gauge and attachments to form a bevel or protractor and square for squaring
beyond any intervening obstacles; also a key-seat gauge, which requires no lining
out at all. The instrument consists of a square, oblong, round, or other approved
shaped base, somewhat similar to that for an ordinary scribing block, made of iron,
steel or any suitable material, with a spindle of round, square, hexagon, or any
approved section placed in a vertical position. The jaws for the slide gauge
being composed of steel, or other approved material, one stationary and the other
moveable: the stationary jaw bored out to fit the spindle, and machined outside to
form a bush, fitting into base, being held and adjusted in position by set screws or
other suitable means. The moveable part, consisting of two jaws combined, one on
either side, with a sleeve in one piece is made of steel or other suitable material-
one jaw being for slide guage, and the other for scriber. The scriber blade is made
of steel, hardened and ground to a true face, brought to a point from three sides
aud attached to the jaw by a thumb-screw and two steady pins, or other suitable
means. The spindle is graduated to any required standard of measurement, say
English one side and French the other. The sleeve of moveable jaw is also
graduated to form a vernier to the primary graduations on the spindle. The slow
movement is obtained from an adjusting screw, carried by another sleeve which is
moveable on and attached to the spindle at suitable intervals by a steady pin, with
spring action entering holes prepared for it-or other suitable means. This screw
has a large head, micrometically divided. Beside the screw, there is a graduated
spindle running parallel therewith, giving greater facility for rapid reading, in
combination with a quick setting movement for use. The instrument can, therefore
be used either as a vernier or micrometer at the will of the operator. I have also
a bevel attachment, consisting of a sleeve and graduated moveable blade fitting on
the spindle, in place of the moveable jaws, clamped by a thumb-screw, and capable
of giving any angle also having a second smaller sliding blade attached at a
right angle, thereby forming a square, which is also to be used as a key-seat gauge,
aud for squaring beyond any intervening obstacles.
As an adjustment for wear I have a large headed screw in the end of the spindle
to bring the moveable jaws in adjustment with the graduations and three screws in
the stationary jaw to bring the jaws to zero.

page_text: Improvements in Scribing Blocks and Caliper Gauges and
the like.
I GEORGE ALEXANDER WOOD of 1 Twyford Street Caledonian Road London
in the County of Middlesex Engineer 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 object of this invention is to combine in one tool a scribing block, caliper
gauge, bevel, keyseat gauge, protractor and square, the scribing block and caliper
gauge being capable of accurate adjustment by means of a vernier and micrometer
screw.
Now according to this invention I provide a suitable base perforated to receive a
pillar graduated in any suitable linear measure as for instance English on one side
and French on the other on which pillar slides the movable jaw of a caliper gauge
and a scribing point. The sleeve of the movable jaw is graduated to form a vernier
to the primary graduations on the pillar and is secured thereto by means of a
clamping screw or other suitable means. Above the movable jaw is a sleeve
(which may be secured to the pillar by means of a clamping screw and spring
actuated steady pin or other suitable means) carrying a micrometer screw which
engages with a female thread in the movable jaw..
I provide also a bevel graduated in ordinary units on one edge and in half units
on the other the said half unit scale being used for centring shafts, as a keyseat
gauge and for other purposes. To this arm or bevel may also be clamped a piece
of any suitable material sliding at right angles to the blade of the bevel. I prefer
to provide the bevel with a suitable protractor.
provide means for adjustments of wear (hereinafter referred to) whereby the
movable jaws are brought into adjustment with the graduations and the jaws to
zero.
And in order that my said invention may be fully understood I will proceed to
explain the same with reference to the accompanying sheets of drawings in
which :-
Fig. 1 represents side view of a combined scribing block caliper gauge and bevel
constructed according to this invention.
Fig. 2 is end view of same.
Fig. 3 is section of same.
Fig. 4 is side view of same when used as a key seat gauge or bevel.
Figs. 5 to 19 are details hereinafter referred to.
The same letters denote the same parts in all the figs.
a is a base plate or block of any suitable size and shape preferably constructed
of steel the bottom of which forms a true plane or 'the bottom may be provided
with ribs faced to a true plane. This base is perforated to receive a pillar b and
bush e the latter forming a part of the fixed jaw d.
The pillar bis graduated with any suitable number of units of length and
subdivisions of units such as inches, centimetres or other suitable unit. At the
bottom of the pillar is a female thread to receive the screw e the head of which
enters the base a. The jaw d is capable of being clamped to the pillar 6 by means
of a set screw or other suitable means. I provide also three or more levelling
screws one of which is shown at f. The object of such levelling screws is to
enable the adjustment of the movable jaw in the case of wear or damage. These

page_text: adjustments are made by unclamping the screws securing the bush to the pillar-
the screw e is then rotated in order to draw down the pillar until the zero on the
pillar scale and the zero on the vernier coincide. The bush is then clamped to the
pillar and base and thereby held firmly together.
The jaws g and i are formed in one piece with or attached to a sleevej perforated
to fit the pillar accurately and capable of being clamped thereto by means of the
screw K. The sleeve is also provided with a lug or projection in which is
formed a female thread engaging with the micrometer screw . The lug may be
split as shown and tightened on the screw by means of a screw passing through
the ears. The head of the screw is divided into any suitable number of parts
and the scale m which slides in the lug is so divided that one unit of the scale
corresponds to one revolution of the screw / or in any other suitable manner.
The screw
rotates in a bearing formed in one with or attached to a sleeve n
perforated to accurately fit the pillar. This sleeve is capable of being secured to
the pillar by means of the spring actuated steady pin o and the clamping screw p.
The steady pin o engages with holes or depressions in the pillar as shown at Fig. 3.
In the case of a round pillar a suitable slot is formed in the pillar to receive keys
secured to the sleeves to prevent their rotation round the pillar.
g is the scriber which is of the form shown at Figs. 7 and 8. The scriber is
formed to a true face on the upper side thereof and ground to a point in the
manner shown.
I secure the scriber to the underside of the jaw i by means of steady pins and
the clamping screw or in any other suitable manner.
In use the work is placed on parallel blocks of the same height as the distance
of the upper face of the jaw d from the under side of base. In case however the
work cannot be placed on blocks I use the bent scriber shown by Figs. 9, 10 and 11
and in dotted lines Fig. 1. This scriber is so constructed as to be level with the
underside of the base when the jaws g and d are in contact.
When the tool is to be used as a bevel, keyseat gauge or square, the movable
jaw and micrometer are removed and the bevel attachment shown by Figs. 4 5
and 6 substituted. The blade A of the bevel preferably has a longitudinal slot
therein in which slides a bolt the use of which is hereinafter explained.
The blade A is pivoted at B to a lug having a split collar C. The collar C is
perforated to fit the pillar b and clamped thereto by a screw D. A clamping
screw E secures the blade A in any desired position.
The blade is graduated with two scales-one scale being divided into units
and the other into half units :-these primary divisions are again subdivided as
desired.
The upper scale is an ordinary measure of length and the lower one serves to
centre shafting, mark off key beds and so on as shown at Fig. 4, the vertical square
being first clamped to the blade A at the zero of the lower scale. The diameter
of the shaft G being known it is only necessary to place it against the square F.
and lower the blade on to it, when the ceutre of the shaft is shown by the number
on the scale corresponding to the diameter of the shaft. In the drawing the
shaft G is three and one half inches in diameter. H is a protractor formed in one
with or attached to the blade A and having marked thereon the usual subdivisions
of a right angle. The square F shown in detail at Figs. 12 13 and 14 is formed
of any suitable material and has a groove F" therein to receive a projection I on
the head of the bolt J (shown in detail at Figs. 15 and 16).
K is a washer (shown in detail at Figs. 17, 18 and 19) having a slot L therein
through which passes the neck of the bolt J. The washer K has a stepped flange
on each side to enable the washer to slide on the blade A, the higher step serving
as an abutment against which rests the edge of the blade F, the head of the
bolt J fitting between them. A nut rotating on the said screw clamps the whole
firmly to the blade A. The blade A and square F may be used for squaring
beyond intervening obstacles. The blade F may be clamped at right angles to the
blade A by any other suitable means instead of by the arrangement shown.

page_text: 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. In scribing blocks caliper gauges and the like the combination of a base.
having a fixed jaw secured thereto with movable jaws sliding on a pillar secured to
the base and adjusted by a micrometer screw substantially as specified.
2. In scribing blocks caliper gauges and the like the combination of a graduated
pillar with movable jaws sliding thereon, said jaws being provided with a vernier
scale and device for clamping the said jaws to the pillar substantially as specified.
3. The combination in a scribing block, and caliper gauge of a base having a
graduated pillar and a fixed jaw attached thereto with a sleeve adapted to be
clamped to the pillar and a micrometer screw for adjusting the distance between
the fixed and movable jaws substantially as described.
4. In a scribing block and caliper gauge the method of adjustment of the jaws
and of the zero of the vernier to the zero of the scale substantially as described.
5. In scribing blocks, caliper gauges and the like the keyseat gauge and bevel
attachment substantially as described and shown at Figs. 5 and 6 of the
accompanying drawings.
6. The combined caliper gauge scribing block, bevel square and keyseat gauge
constructed substantially in the manner hereinbefore specified and shown by the
accompanying drawings.
Dated this 15th day of February 1895.
H. C. FOWLER,
11, Furnival Street, Holborn, E.C., Agent for Applicant.