Improved Apparatus for Indicating the Number of Teeth of Gear Wheels.
Year: 1897

page_text: PROVISIONAL SPECIFICATION.
Improved Apparatus for Indicating the Number of Teeth of Gear
Wheels.
I, JAMES BARBOUR, of Falls Foundry, Belfast, Ireland, Machine Maker, do hereby
declare the nature of this invention to be as follows:-
This invention consists of a new or improved apparatus which by measuring and
scaling indicates the number of teeth of gear wheels.
The apparatus comprises a disc or drum the periphery or circumferential surface
of which is divided by a series of circumferential lines and each of the spaces so
formed are by means of radial or cross lines and numerators divided so as to form
a scale and each scale is for a pre-determined number of teeth per inch of any
diameter of wheel. The scale drum is mounted on an axis on which is a pinion
gearing with a rack mounted on a slide piece carried plate and at the end of the
latter is a stop piece.-To ascertain the number of teeth in a wheel. Place the wheel
to be measured on the bed plate against the stop piece count the number of teeth
per diameter of the wheel so as to ascertain on which scale the number of teeth in
the wheel will be indicated turn the disc or drum until the slide is brought by the
pinion and rack into touch with a like stop piece on the frame. Meanwhile such
movement of the pinion, rack scale drum and slide will have moved the scale drum
part of a revolution and the circumferential scale is read off at the fixed index
which will indicate the number of teeth in the wheel.
Dated this 27th day of September 1897.
BRIERLEY & HOWARD,
Penny Bank Chambers, Halifax, Agents for the Applicant.
BRIERLEY & HOWARD,
Penny Bank Chambers, Halifax, Agents for the Applicant.
Improved Apparatus for Indicating the Number of Teeth of Gear
Wheels.
I, JAMES BARBOUR, of Falls Foundry, Belfast, Ireland, Machine 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 consists of a new or improved apparatus which by measuring
and scaling indicates the number of teeth of gear wheels.
Such being the nature and object of my said invention, the following is a
complete description of same, reference being had to the annexed drawings, in
which:-

page_text: Fig. 1 is a side elevation of the improved apparatus for purpose
aforesaid.
Fig. 2 is a plan view of .Fig. 1.
Fig. 3 is an end elevation (partly in section) of. Fig. 1.
At 1 is a disc or drum mounted upon the axis or shaft 2 free to be turned by the
handle 3 in its bearings 4, 4ª attached to and carried by the framing or gantry 5;
on the upper surfaces of the latter is the slide 6 to which is cast or affixed the
At 10 is
rack 7, the teeth of which gear with the pinion 8 on the axis or shaft 2.
a standard, the upper part of which extends over and across the periphery of the
drum 1 and is divided into a number of spaces marked (in the example
shewing on the drawing) 8, 10, 12, 14, forming a scale 10.
The surface of the drum 1 is divided into circumferential spaces a, b, c, d
(corresponding to the spaces of the scale 10) and such spaces are by cross lines
and numerators divided so as to form index scales, and each of such scales, a,
b, c, d, is for a predetermined number of teeth per inch of any diameter of wheel,