Improved Tappet Setter, chiefly applicable to Stamp Milling Apparatus.
Year: 1899

page_text: Date of Application, 14th Apr., 1899
Complete Specification Left, 3rd May, 1899-Accepted, 10th June, 1899
PROVISIONAL SPECIFICATION.
Improved Tappet Setter, chiefly applicable to Stamp Milling
Apparatus.
A communication from JAMES PHILIP MCKEOWN, of The Geldenhuis Main Reef
Gold Mining Company, near Johannesburg, South African Republic, Battery
Manager.
I, JOHN CLAYTON MEWBURN, of the Firm of J. C. Mewburn and Ellis, of
55 and 56, Chancery Lane, in the County of London, Chartered Patent Agents, do
hereby declare the nature of this invention to be as follows:-
It is necessary in stamp-milling to frequently set the tappets on the stamp
stems, as this determines the amount of "drop" required. Consequently as the
shoes and dies wear away the tappet has to be raised on the stem a corresponding
amount.
It also frequently occurs that the key which secures the tappet to the stem does
not fit quite tight causing the tappet to slip on the stem with the result that the
tappet has to be lowered on the stem.
The present invention has been designed with the object of providing a simple
and inexpensive apparatus by the use of which tappet setting is easily and quickly
accomplished without the difficulties and dangers attendant on the operation as
at present performed.
The invention consists in the employment of a collar constructed in halves
hinged together so as to be readily opened. This collar is at one extremity
provided with two jaws between which a screw bolt attached to the other half
of the collar passes. The collar therefore may be firmly secured to a stamp
stem by being placed around the stem, and the said bolt tightened by means
of a ratchet wrench.
One of the halves of the collar is further provided with a vertical screw or bolt
constructed so as to move in a plane parallel to the axis of the stamp stem and close
to its circumference, the object being that when the apparatus is secured to a
stamp stem the said vertical bolt will, on being screwed down, raise the stem
through the tappet and vice versa.
In connection with the apparatus a ratchet wrench is used in one direction when
it is desired to turn the bolt so as to raise the stem and is reversed when it is
desired to lower it.
1
1 1000
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.

page_text: Improved Tappet Setter, chiefly applicable to Stamp Milling
Apparatus.
A communication from JAMES PHILIP MCKEOWN, of The Geldenhuis Main Reef
Gold Mining Company, near Johannesburg, South African Republic, Battery
Manager.
I, JOHN CLAYTON MEWBURN, of the Firm of J. C. Mewburn and Ellis, of
55 and 56, Chancery Lane, in the County of London, Chartered Patent Agents, 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:-
It is necessary in stamp-milling to frequently set the tappets on the stamp
stems, as this determines the amount of "drop" required. Consequently as the
shoes and dies wear away the tappet has to be raised on the stem a corresponding
amount.
It also frequently occurs that the key which secures the tappet to the stem does
not fit quite tight causing the tappet to slip on the stem with the result that the
tappet has to be lowered on the stem.
This "setting" of the tappet is at present usually accomplished by employing
overhead tackle by means of which the stamp stem is suspended. The key is
then knocked out of the tappet and the tappet re-adjusted into its proper position.
As the operation has generally to be performed without stopping the remaining
stamps of the battery a certain amount of danger is necessarily involved.
The present invention has been designed with the object of providing a simple
and inexpensive apparatus by the use of which tappet setting is easily and quickly
accomplished without the difficulties and dangers aforesaid.
The invention is illustrated in the accompanying sheet of drawings, in which :-
Figure 1 shows a perspective view of the tappet setter closed.
Figure 2 is an elevation of the same partly sectional, the collar being slightly
opened.
Figure 3 represents a ratchet wrench for use in connection with the tappet
setter.
Fig. 4 is a view of the screw G with foot H detached.
The invention consists in the employment of a collar adapted to fit round a
stamp stem and constructed in halves A and B hinged together at C the portion A
being provided with jaws D) between which a screw bolt E formed on the end of the
portion B is adapted to be received. F is an elongated nut to be received upon
the screw bolt E and furnished with a head F¹ to allow of its being readily
gripped by the ratchet wrench shewn in Figure 3. The portion A of the collar
is further bored and threaded to receive the screw G which moves in a plane
parallel to the axis of the stamp stem, said screw G being provided at one end
with a head G¹ so that it can be turned by the aforementioned ratchet wrench
and at the other end with a loose foot H.
The construction of the said bolt G is shewn in Figure 4 in which the foot H
is shewn detached. This foot H is bored so as to be received on the end of the
bolt G and is held in position by the pin H' which is inserted through the hole H2
so as to enter the groove H³. The foot H therefore is attached to but does not turn
with the screw G.
66
In operation the stamp stem is first hung up in the usual way on its supporting
finger; "the collar is then placed around the stem with the foot H of the screw G

page_text: projecting downwards and screwed up tight upon the stem by turning the nut F.
The screw G is then turned until the foot H rests upon the top surface of the
tappet. The key of the tappet is then withdrawn, thereby leaving the tappet loose
upon the stem. The weight of the stamp is therefore now borne by the collar.
It is clear that on turning the screw G in one direction the collar secured to the
stamp stem will be raised while on turning said screw in the reverse direction
it will be lowered. As soon as the stem has been raised or lowered as the case
may be to its correct height the key is reinserted in the tappet when the collar is
withdrawn from the stem by loosening the bolt F.
Having now particularly described and ascertained the nature of the said
invention, as communicated to me, and in what manner the same is to be performed
I declare that what I claim is:-
1. An improved tappet setter consisting of a collar adapted to be secured round
the stamp stem and provided with a vertical screw to raise or lower the stamp
stem through its tappet which has been previously loosened, substantially as
described.
2. An improved tappet setter consisting of a collar adapted to be secured round
the stamp stem and consisting of two portions A and B hinged as at C the one
half being provided with jaws D) and the other half with a screwed portion E
adapted to be received between the said jaws D the bolt F adapted to be
received upon the threaded portion E, the vertically moving screw G provided
with the head G¹ and loose foot H, the whole arranged substantially as herein before
described and illustrated in the accompanying drawings
3. An improved tappet setter consisting of the arrangement of parts sub-
stantially as herein before described and illustrated in the accompanying
drawings.
J. C. MEWBURN & ELLIS,
55 and 56, Chancery Lane, London, Chartered Patent Agents.