Improvements in Teeth for Steam "Navvies" and the like.
Year: 1897

page_text: Date of Application, 10th Aug., 1897
Complete Specification Left, 16th Sept., 1897-Accepted, 13th Nov., 1897
PROVISIONAL SPECIFICATION.
Improvements in Teeth for Steam "Navvies" and the like.
I, JOHN KEELING of No. 5 Hut, Brackley, in the County of Northampton,
Engineer, do hereby declare the nature of this invention to be as follows:-
$6
This invention relates to improvements in teeth for steam "navvies," and the
like and has for its object to provide such steam
navvies" and the like with
teeth which shall last an appreciably longer time, be easier of manipulation and
cheaper than those at present in use, while the difficulty and inconvenience hitherto
experienced in sharpening will be entirely obviated.
În carrying my invention into practice I provide teeth with reversible steel
shoes which shoes are to be secured to the feet of the teeth by means of single pins
passing through such shoes and feet. In operation when one side of a tooth becomes
worn the pin is taken out, the position of the shoe reversed and the pin put in
again thus causing the other side of the tooth to be used and consequently no
sharpening is necessary.
Dated this 10th day of August 1897
HUGHES, SON & Co.,
38, Chancery Lane, London.
Improvements in Teeth for Steam "Navvies" and the like.
I, JOHN KEELING, of No. 5, Hut, Brackley, in the County of Northampton,
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:-
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This invention relates to improvements in teeth for steam navvies" and the
like and has for its object to provide such steam "navvies
or the like with
teeth which shall last an appreciably longer time be easier of manipulation and
cheaper than those at present in use, while the difficulty and inconvenience hitherto
experienced in sharpening will be entirely obviated.
In carrying my invention into practice I provide teeth with reversible steel
shoes which shoes are capable of being secured to the feet of the teeth as will
hereafter appear.
And in order that this my invention may be the more readily
understood and carried into practical effect reference is hereby made to the accom-
panying sheet of illustrative drawings wherein,
Fig. 1 is a perspective view of my improved tooth. Fig. 2 being a similar

page_text: view shewing the foot and reversible shoe (above referred to) which together con-
stitute the tooth separate one from another.
Referring to the drawings in which like letters of reference indicate corre-
sponding parts in both figures a is the reversible steel shoe which has formed
in its extremity a¹ a hole or recess a² of a shape to correspond to the square
truncated pyramidal shaped portion 61 of the foot 6 of the tooth which portion b¹
fits into the aforesaid hole or recess a² in such manner that the four faces of the
shoe a are flush with the four faces of the foot b. The extremity of this afore-
said shoe a constitutes operating edge as will easily be seen from the drawings.
Through this shoe a and portion 61 of the foot b a cylindrical hole or way c is
drilled or otherwise formed into which is passed a pin or key c¹ of corresponding
shape and size to the aforesaid hole or way c, thus connecting the shoe a securely
to the foot band as a consequence making them virtually one.
In operation when one side of the operating edge a³ of the shoe becomes worn
or blunt the pin or key c¹ is drawn or forced out of the hole or way c the shoe a
is removed from the foot b and put on again in an exactly reversed position the
pin c¹ being inserted again into the hole or way c to fix such shoe in position.
By this means the other side of the operating edges of the shoe a is brought
into use and thus no sharpening is necessary. In manufacturing these teeth
care must be taken to form the parts in such a manner that they will correspond
in all respects in either position.
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: -
1. The improvements in teeth for steam navvies and the like substantially as
herein before described and shewn.
2. In teeth for steam navvies the reversible steel shoe a fitting on to the foot b
and capable of being fastened by the pin or key c¹ in two positions substantially
as and for the purpose hereinbefore described and shewn.
Dated this 16th day of September 1897.
HUGHES, SON & Co.,
38, Chancery Lane, London.