Improved Means for Varying the Stroke of Tilt Hammers.
Year: 1895

page_text: PROVISIONAL SPECIFICATION.
Improved Means for Varying the Stroke of Tilt Hammers.
I, EDWARD ARTHUR PARROCK, of 90, Francis Street, Birmingham, in the
County of Warwick, Mechanic, do hereby declare the nature of this invention to
be as follows:-
This invention consists of the hereindescribed improved means for varying the
stroke of tilt hammers so that the attendant can instantly cause the tilt hammer to
lift to and fall from different heights and strike either a light or heavier blow as
may be required for the particular work which is being done.
In carrying out this invention I provide on the revolving shaft from which the
lift of the tilt hammer is obtained a cam which by means of a clutch lever and
screw or by any other means can be slided to and fro on the said shaft which latter
is provided with a feather or is otherwise formed so as to turn the said cam.
This cam has one or more ribs upon its periphery which rib is or ribs are inclined
rising gradually farther from the centre of the shaft. The said cam acts upon a
roller or bearing piece (the periphery or acting surface of which is also by
preference inclined to match the ribs) which is fixed on the tilt hammer or near
the fulcrum of the same so that as the cam revolves its inclined rib or ribs acts
or act upon the said roller or bearing piece and lift the tilt hammer allowing the
same to drop immediately one of the ribs has passed the roller. To vary the lift
of the tilt hammer the cam has to be moved to or fro by the lever along its said
shaft and fixed in any desired position to give the required lift; that is to say
when the cam is moved in one direction so that a higher part or higher parts of
the rib or ribs acts or act upon the roller then the lift of the tilt hammer is increased,
similarly when the cam is moved in the opposite direction the lift of the tilt hammer
is diminished. I may provide either one two three or more of the said lifting ribs
on the cam according to the number of times the hammer is required to rise and fall
daring one revolution of the shaft upon which it is mounted.
Dated this 16th day of May 1895
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.
Improved Means for Varying the Stroke of Tilt Hammers.
1, EDWARD ARTHUR PARROCK, of 90, Francis Street, Birmingham, in the
County of Warwick, Mechanic, 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 the hereindescribed improved means for varying the
stroke of tilt hammers so that the attendant can instantly cause the tiit hammer
Price 8 |

page_text: to lift to and fall from different heights and strike either a light or heavier blow as
may be required for the particular work which is being done."
I will describe my invention by referring to the accompanying drawings on
which
Fig. 1 is a sectional elevation of a tilt hammer with my invention applied ;
Fig. 2 is a cross sectional elevation of part of the said hammer;
Fig. 3 is a side elevation and Fig. 4 is an end elevation of the cam which
according to this invention I provide for operating the tilt hammer and for varying
the stroke of the same.
The same letters of reference indicate the same parts in all the figures.
A is the tilt hammer, B' is the fulcrum of the same about which the hammer
turns, al is the hammer head and C is the anvil. D is the revolving shaft from
which the lift of the tilt hammer is obtained, this shaft revolving in the direction
indicated by the arrows in Figs. 1 and 2. B Bare counter-balance weights on the
haminer shaft A for partly counter-balancing the weight of the hammer head a¹ as
may be required and E is the spring buffer on which the back part of the hammer
strikes when the hammer head a' is lifted.
All these parts are well known in tilt hammers and I make no claim in respect
of them.
In carrying out this invention I provide on the revolving shaft D by which
the lift of the tilt hammer is obtained a cam F which by means of the clutch
lever G and treadle H and connecting rod ¹ or by other suitable means, can
be slided to and fro on the shaft D which latter is provided with a feather d
or is otherwise formed so as to turn the cam F. The clutch lever G is forked
at g' to engage in the groove f' of the cam F and it turns about the fixed
fulcrum pin 9. The cam F has four ribs f f f upon its periphery (or the
cam may have only one, two, three or more than four ribs) which ribs are inclined
as shewn rising gradually farther from the centre of the shaft D. It will be seen
that the ends of the ribs nearer to the groove are much farther from the
centre of the shaft D than are the other ends of the ribs. The cam Facts
upon the roller I (or instead of the roller I there may be a bearing piece fixed
on the hammer A for the cam to act against) the periphery of which is also
by preference inclined as shewn to match the ribs and which turns on the
fulcrum pin fixed between the forked parts a² a³ of the tilt hammer near the
fulcrum B of the same so that as the cam F revolves its inclined ribs f¹ƒ ƒ³ f
successively act upon the roller I and lift the tilt hammer A allowing the same
to drop immediately one of the ribs has passed the roller I. To vary the lift of
the tilt hammer A the cam F has to be moved to or fro along the shaft D to any
desired position to give the required lift; that is to say, when the foot lever H is
depressed the cam F is moved in one direction that is towards the right hand in
Fig. 2 so that the higher parts of the ribs f¹ f f f act upon the roller I and the
lift of the tilt hammer A is increased, similarly when the spring J causes the foot
lever H to rise, the cam F is moved in the opposite direction that is towards the
left hand in Figure 2 and the lift of the tilt hammer A is diminished.
provide either one, two, three or more of the said lifting ribs f¹ƒ ƒ³ ƒ on the
cam F according to the number of times the hammer A is required to rise and fall
during one revolution of the shaft D upon which the cam F is mounted.
I may
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 combination with a tilt hammer the employment of a revolving lifting cam
and means for moving the said cam end wise along its shaft, said cam having one or
more inclined ribs upon its periphery shaped so as to lift the tilt hammer and also
increase the lift of the same when the cam is moved endwise in one direction
and to diminish the lift of the same when the cam is moved end wise in the other
direction as herein set forth.

page_text: 2. In combination with the tilt hammer A movable about its fulcrum B' the
employment of the revolving cam F movable along its shaft and made with inclined
lifting ribs upon its periphery and means for moving said cam along said shaft so
as to increase or diminish the lift of the tilt hammer, substantially as hereinbefore
described and illustrated by the accompanying drawings.
Dated this 25th day of February 1896.
CHARLES BOSWORTH KETLEY,
Agent for the Applicant.