Year: 1898

page_text: I, JOHN HIND, of 8, Ulster Chambers, Belfast, Engineer, do hereby declare the
nature of this invention to be as follows:-
This invention has for its object to improve the construction of piston
described in the Specification of William Rowans Patent No. 2013 of 1877 and of
John Hinds Patent No. 9981 of 1894 so as to render the piston more efficient and
less liable to derangement and consequent loss of steam by leakage. In the said
specification the flat sinuous spring of originally circular form is provided with
projections or blocks at equal distances apart, and it is found in practice that
these blocks occasionally work loose and become shifted into places of unequal
distances apart so that the spring becomes ineffective. To remedy this defect I
employ flattened tubes or sleeves of steel of sufficient length to keep in place on
the spring. Each sleeve is made a good fit on the spring and is moreover affixed
by a rivet which also serves to fix a small block of iron or other metal; these
blocks forming the projections for producing the required sinuosity in the spring.
Or I make the rivet heads to form the projections. If a spring should break
through a rivet hole it will not fall to pieces as heretofore but still be held in
the sleeve.
Springs of such a length as those referred to are difficult to temper evenly
throughout and hence steel of low temper has heretofore been used which some-
times takes a permanent set so that its efficiency as a spring is impaired or
annulled. In order to overcome this I may employ a spring of low temper in com-
bination with short pieces of spring of by preference high temper, and utilize the
aforesaid sleeves for holding them together in laminated form; even if one of
the spring pieces of high temper should break the spring of low temper will to
some extent maintain the efficiency of the piston. The springs may also be made
two or more in number side by side as described in Specification 99814 and also
laminated and held together by the sleeves. Or the spring may be made of pieces
of by preference high temper alone held together by sleeves which latter may be
provided with the blocks rivets as described or be bent up to form the required
projections to abut against the piston ring.
and
or

page_text: Improvements in the Construction of Pistons.
I, JOHN HIND, of S, Ulster Chambers, Belfast, 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:
-
This invention has for its object to improve the construction of pistons
described in the Specification of William Rowan's Patent No. 2013 of 1877 and of
John Hinds Patent No. 9981 of 1894 so as to render the piston more efficient and
less liable to derangement and consequent loss of steam by leakage. In the said
specification the flat sinuous spring of originally circular form is provided with
projections or blocks at equal distances apart, and it is found in practice that
these blocks occasionally work loose and become shifted into places of unequal
distances apart so that the spring becomes ineffective.
Fig. 1 of the accompanying drawings is a front view of one of my sinuous springs
fitted with a block according to my present invention Fig. 2, a side view, Fig. 3
a side view and Fig. 4 a plan view. A is a flattened tube .or. sleeve of steel of
sufficient length to keep in place on the spring S. Each such sleeve is made a
good fit on the spring and is moreover affixed by a rivet C which also serves to
fix a small block B of iron or other metal, these blocks forming the projections for
producing the required sinuosity in the spring.
Or as shown in the side view Fig. 3 the head of the rivet C is made to form
the projection.
Figs. 5, 6 and 7 are corresponding views of this invention applied to two or more
springs united by sleeves A and blocks B.
If a spring should break through a rivet hole it will not fall to pieces as here-
tofore but still be held in the sleeve A.
Springs of such a length as those referred to are difficult to temper evenly
throughout and hence steel of low temper has heretofore been used which some-
times takes a permanent set so that its efficiency as a spring is impaired or
annulled. In order to overcome this I may employ a spring of low temper in com-
bination with short pieces of spring of by preference high temper, and utilize the
aforesaid sleeves for holding them together in laminated form; even if one of
the spring pieces of high temper should break, the spring of low temper will to
some extent maintain the efficiency of the piston.
Fig. 8 is a plan view and Fig. 9 a side view of a sleeve A with block B for hold-
ing together a sinuous spring S of low temper and a short reinforce spring S¹ of
high temper.
Fig. 10 is a plan view of another form of knuckle in which sleeve and block are
made of one piece of flattened tube bent in the form shown.
This form of knuckle is used with short pieces of steel which when coupled
together by means of the knuckles or sleeves form a continuous sinuous spring.
Having now particularly described and ascertained the nature of my said in-
vention and in what manner the same is to be performed I declare that what I
claim is: :―
1. The attachment of knuckle pieces to piston springs of the character described
at equal distances in such manner as not to shift thereon substantially as set forth
2. The improved construction of knuckle piece described with reference to
Figs. 1 to 4,
3. The improved construction of knuckle piece described with reference to
Figs. 5 to 7.

page_text: 4. The improved construction of knuckle piece with reinforce spring S¹ de-
scribed with reference to Figs. 8 and 9.
5. The improved construction of knuckle piece described with reference to
Fig. 10.
Dated this Sixth day of December 1808