Improvements in and Connected with Eccentrics for Operating the Slide Valves of Steam and other Engines, and for Producing Reciprocating Motion in other Machinery.
Year: 1886

page_text: Date of Application, 10th Nov., 1886.
Complete Left, 10th Nov., 1886.
Complete Accepted, 19th Apr., 1887.
DPAI
Improvements in and Connected with Eccentrics for Operating the
Slide Valves of Steam and other Engines, and for Producing
Reciprocating Motion in other Machinery.
We JOHN PECK and WILLIAM PECK both of the Borough Iron Works, Boston in the
County of Lincoln Engineers do hereby declare the nature of this invention to be as
follows:-
:-
To produce an eccentric with fixed guides, for operating the slide valves of steam,
and other engines, and for other purposes, by the which a direct level action will be
given to the rod or its equivalent, instead of the oscillating action, given by the
ordinary eccentric. The rod or its equivalent is not necessarily jointed. The further
object of our invention is to guide the rod, or its equivalent, from the ordinary
eccentric strap, by using a fixed guide, or guides, which shall give the rod or its
equivalent a direct level action. First, by means of a disc with a groove cut inside
eccentrically, into which groove we fit a crescent block, with pin or stud, on to which
pin or stud we attach rod or block, which block works between a guide, or guides,
which when shaft of eccentric revolves, the motion produced is a direct level recipro-
cating motion. Secondly, by means of the before mentioned guide, the same direct
motion may be produced, if a pin be fitted to side of ordinary eccentric strap, and on said
pin, the connecting rod end, or block, be held between the said guide, or guides.
Dated this 8th day of November 1886.
JOHN PECK.
WILLIAM PECK.

page_text: Improvements in and Connected with Eccentrics for Operating the
Slide Valves of Steam and other Engines, and for Producing
Reciprocating Motion in other Machinery.
We JOHN PECK and WILLIAM PECк, both of the Borough Iron Works, Boston in
the County of Lincoln Engineers, 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 :-
The object of our invention is to produce, an eccentric with fixed guides, for
opening the slide valves of steam, and other engines, and for other purposes, by the
which a direct level action will be given to the rod, or its equivalent, instead of the
oscillating action, given by the ordinary eccentric. The rod or its equivalent is not
necessarily jointed. The further object of our invention, is to guide the rod or its
equivalent, from the ordinary eccentric strap, by using a fixed guide, or guides, which
shall give the rod, or its equivalent a direct level action.
To carry out this first object we form a circular disc somewhat similar to the
ordinary plummer block of the common eccentric which disc having previously formed
or constructed the same therefor we key or otherwise fix eccentrically on the shaft
from which the motion is to be taken in the usual or other convenient manner and on
the side of this disc and a certain desired distance from the periphery thereof we form
a deep groove concentrically or thereabouts with the disc and therefore eccentrically
with the shaft. This groove may be of any desired shape in cross section whether
rectangular or tapered or otherwise and in this groove we fitt a sliding block of a
corresponding shap in cross section, which block may be of any convenient length in
the groove from 30° to 60° of arc being very suitable, but a whole circle may be
used if desired. In the center or thereabouts of this crescent shaped, or if desired
whole circle block we fitt a pin or stud, on the projecting end whereof is mounted the
end of the connecting rod that is to be driven or a block attached thereto, this rod or.
attached block which is mounted on the pin or stud is capable of sliding between
guides or a guide. Supported in position by a rod or standard secured firmly on the
base plate of machine or elsewhere and these fixed guides or guide are of sufficient
length to clasp or hold the end of rod or attached block, or otherwise where convenient,
and thus when the shaft with this eccentric attached is revolved the crescent shaped
block or whole circle block will slide in the eccentric groove and imparting to the rod
or its equivalent the direct level reciprocating motion desired.

page_text: Second this desired level direct motion may be obtained if more convenient for any
purpose from an ordinary eccentric block and with the usual straps, to obtain this
direct level reciprocating motion we fitt a pin or stud into the side or sides of eccentric
strap onto this projecting pin or stud we mount the before mentioned rod end or
block, attached to rod, which is capable of moving between fixed guides or a fixed
guide as in the case of the grooved eccentric and crescent block with pin.
With both kinds of eccentrics the fixed guides or guide with pin or stud are
necessary for to produce a perfectly direct level reciprocating motion but the guides
or guide may be of any convenient shape or form either clasping the block or connecting
rod as may be desired.
When the aforesaid reciprocating motion is horizontal or thereabouts this standard
can conveniently be fixed in a vertical position or thereabouts and parallel with the
plane of the eccentric, but when the aforesaid reciprocating motion is vertical or
thereabouts this standard is preferably horizontal or thereabouts and may either be
perpendicular to the plane of the eccentric or be parallel therewith or thereabouts or
this standard may be fitted in other convenient manner.
When an heavy load is to be driven by this our eccentric such for example as a
large pump we may form a deep groove aforementioned on each side of the disc cach
of which grooves would contain or be fitted with a crescent shaped or circular sliding
block with a pin or stud and the rod would be forked and fitted on these pins or studs,
on both sides in manner aforesaid the aforesaid plan can be used with the common
eccentric fitted on pins or studs on each side of eccentric strap, in both these cases the
fixed guide or guides must be used.
In order that this our invention may be fully understood we accompany this our
specification with drawings Plate A and Plate B.
Refering to plate A Fig. 1 represents a general view of this our invention Fig. 2 is
a transverse section of same. Fig. 3 and 4 are plans of Crescent block with pin the
crescent block with pins or stud may be a whole circle if desired. Fig. 5 is a cross
sectional plan of block. Figs. 6 and 7 are end and side views of sliding block Figs.
and 9 are front and cross section of guide for slide block 6 and 7. Refering to Fig. 1
on same plate which is a general plan of our invention A is the shaft on which B Ba
disc somewhat similar to the ordinary plummer block of the ordinary eccentric
is fitted fixed by a screw K.
"
C represents a deep groove formed in the side of the disc eccentricaly with the
shaft A this groove may be of any desired shape in cross section in Fig. 2 C is
represented as a tapered groove but it may be retangular or otherwise in this
groove we fitt the sliding block D Fig. 1, 3, 4 corresponding in shape in cross
section, this block we preferably make from 30° to 60° of arc but if desired a full
circle may be fitted in," in the center or thereabouts of this crescent shaped sliding
block or whole circle we fitt a pin or stud E on the projecting end whereof we mount
the end of connecting rod block Fig. 6. 7 F or other rod or its equivalent that is to be
driven. Figs. 1. 8. 9 letter I are guides in which sliding block Fig 6. 7 move J is
the stand on which guide is mounted. H is connecting rod attached to block F.
G is a bush which may be renewed from time to time, the forms of the guide may
however be altered or adapted to meet any requirement.
Refering to Plate B Fig. 1 is a general view of our invention attached to an
ordinary eccentric. Fig. 2 is a transverse view of same again refering to Fig. 1
and 2 Plate B.
A is the shaft on which B B a common eccentric block is fixed by a key or a
screw. CC is the strap usual for common eccentrics. E is a pin or a stud we fitt
on side or sides of strap C. F is a sliding block fitted on projecting end of pin
or stud E G is a bush fitted into slide block, F which can be removed and replaced
when worn out I. I and J is the guide or guides between which slide the block F.
Connecting rod H or its equivalent is attached to block F the form's of guide
may however be altered or adapted to meet any requirement and may clasp the
block or connecting rod or its equivalent. We do not confine ourselves to the

page_text: precise details here illustrated, the fixed guide for example may be made either to
take a block or to claspe the rod or its equivalent.
Having now particularly described and ascertained the nature of our said Invention
and in what manner the same is to be performed. We declare that what, we claim is
1st. To produce an eccentric for operating the slide valves of steam and other
Engines and other purposes, this eccentric having a deep groove in the side into
which we fit a crescent or circular block capable of sliding in groove, in this crescent
or circular block we fit a stud, on this stud we mount a block capable of sliding
between a fixed guide, or the guide may clasp the rod which is attached to block.
2nd. To convert the action of the ordinary eccentric rod of the common eccentric
from an oscillating motion to a direct level reciprocating motion, by fitting a stud or
pin in side of eccentric strap on which stud or pin we mount a block capable of sliding
between a fixed guide.
D :: L 1
CAT
1000