IMPROVEMENTS IN AND RELATING TO THE ADJUSTMENT OF 64 THE PACKING RINGS OF PISTONS
Year: 1884

page_text: PROVISIONAL SPECIFICATION.
I HENRY HARRIS LAKE, of the firm of Haseltine, Lake & Co, Patent Agents,
Southampton Buildings, in the County of Middlesex do hereby declare the nature
of my invention for IMPROVEMENTS IN AND RELATING TO THE ADJUSTMENT OF
64
THE PACKING RINGS OF PISTONS" to be as follows:-
This invention relates to pistons and con.prises mechanism adapted to be
arranged within a hollow piston and enabling the adjustment of the packing-
rings, when worn, without removing the head of the cylinder.
The improved mechanism is essentially composed of one or more toggles, one
toggle bar of which is pivoted to the nave or boss of the piston, into which the
piston-rod is secured, while the other toggle-bar is adapted to bear upon the
packing-ring, when the toggles are operated.
The toggles are operated by means of screws, screwed into that side of the hollow
piston which faces the cylinder-head, holes being provided in the said head through
which suitably formed wrenches can be inserted for turning the screws. Obviously
the mechanism can either be arranged in such a manner that the screws force away
the toggle-blocks, or that the toggle-blocks are drawn by the screws toward the
cylinder-head.
The holes in the cylinder-head are normally closed by screw-plugs. If only one
toggle is applied, the same operates another toggle movable in the plane of the
piston and bearing by its bars upon abutments formed on the inner surface of
the packing-ring.
Dnted thin 1nt
HASELTINE, LAKE & Co.,
For the Applicant.

page_text: I, HENRY HARRIS LAKE, of the firm of Haseltine, Lake, and Co, Patent Agents,
Southampton Buildings, in the County of Middlesex, do hereby declare the nature
of my invention for "IMPROVEMENTS IN AND RELATING TO THE ADJUSTMENT OF
THE PACKING RINGS OF PISTONS" and in what manner the same is to be performed,
to be particularly described and ascertained in and by the following statement:—
This invention relates to mechanism adapted to be arranged within a hollow
piston for enabling the packing-rings to be adjusted, when worn, without removing
the head of the cylinder.
The improved mechanism is essentially composed of one or more toggles, one
toggle bar of which is pivotted to the nave or boss of the hollow piston, into which
the piston-rod is secured, while the other toggle-bar is adapted to bear upon the
packing-ring, when the toggles are operated. This operation is caused by screws,
screwed into that side of the hollow piston which faces the cylinder-head, the
latter being provided with holes into which suitably shaped wrenches can be
introduced for turning the screws. Obviously, the mechanism can be arranged
in such a manner that the screws force away the toggle-blocks, or so that the
toggle-blocks are drawn by the screws toward the cylinder-head. The holes in
the cylinder-head are closed by screw-plugs.
If one toggle only is applied, the same operates another toggle movable in the
plane of the piston and bearing by its bars upon abutments formed on the inner
surface of the packing-ring.
In the accompanying drawing, in which similar letters of referenco indicate
corresponding parts
Figure 1 is a sectional elevation of a piston provided with adjusting mechanism,
constructed according to this invention.
Figure 2. is a plan view of the same.
Figures 3 and 4 are views, similar to Figures 1 and 2. respectively, of a piston
provided with modified adjusting mechanism.
In Figures 1 and 2 a series of bearing-forks d are shewn screwed into the nave
or boss a of the piston c, or otherwise connected thereto, the said boss having
rigidly secured in it the piston-rod b. To each of the forks d is pivotted one bar
of a pair of toggles e e, the other bar of which carries, by means of an eye f, a
bow-spring g.
A disc loosely mounted on the boss a of the piston c, rests on the toggle-blocks
of all the toggles, and is adapted to be pressed upon the same. When the adjusting
screws in the piston cover are screwed down, they force downward the disc
upon which they boar, thus operating the toggles which lengthen and press the
bow-springs against the inner surface of the packing-ring. In this way the
diameter of the packing-ring is sufficiently enlarged.
The piston is secured to the piston-rod in such a position, that the square heads
of the screws i enter at each stroke recesses in the hollow screw-plugs m, screwed
into the holes of the head of the cylinder.
When the packing-ring is to be adjusted, the engine is set on that dead point
which places the piston near the cylinder-head; the plugs m are then unscrewed,
and by means of a wrench fitting the heads of the screws i, the said screws which
project through the holes of the cylinder-head, are screwed down the necessary
distance. After this has been done, the plugs m are screwed in again.
Figures 3 and 4 show a piston in which tho adjusting mechanisin of the packing-
ring comprises only one toggle e e movable in the described manner by means of a

page_text: screw i. In this case, the eye
pivotted to the outer toggle-bar carries, instead of
a bow-spring, a toggle g', gl, whose bars are movable in the plane of the piston
round a bolt f', and bear on abutments jj formed on the inner surface of the
packing-ring k
When the screw i is screwed down, thereby operating the toggle e e, the eye f,
which forms the toggle-block of the toggle g³, gl, is forced toward the packing-
ring thus operating the toggle g¹, g₁ so that its bars force asunder the
abutments ji, whereby the diameter of the packing-ring k is enlarged, and the
packing-ring pressed tightly to the sides of the cylinder.
It will be easily understood without the aid of drawings, that the toggles or
toggle could as well be arranged in such a manner that the points of the angles
formed by the toggle-bars would not face the cylinder-head but have an inverse
position; in this case the adjusting screws must be suitably connected with the
toggle-blocks, as the toggles cannot be operated by pressure, but by draught only.
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 =
Mechanism for adjusting the packing rings of pistons, the said mechanism
consisting of one or more toggles radially arranged within the hollow piston
and bearing with one bar upon the packing-ring, and screws in the front cover
of the piston adapted to be turned without the cylinder-head having to bo
removed, and adapted to draw out, or force in, the toggle-blocks, substantially
as set forth.
Dated this 12th day of January 1885
HASELTINE, LAKE & Co.,
For the Applicant.