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Патент USA US2132596

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Oct. 11, 1938.,
c. BANcRol-"T
2,132,596
RÓTARY DISPLACEMENT MEANS _I `
'Filed Jan. 29, 1938
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ROTARY DISPLACEMENT MEANS
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2,132,596
Patented Oct. 11, 1938
uNiTED sTAras eA'rsr ottici;
2,132,596
ROTARY DISPLACEMENT‘ MEANS
Charles Bancroft, New‘Canaan, Conn.- ‘
Application January 29, 1.938, Serial No. 187,670
24 Claims. (Cl. 10S-129)
throw radius and arcuate bearing> pads 2l having
their centers spaced from the crank pin axis in
excess of the crank throw. O‘ne‘disk and asso
y , Thisinvention relates to rotary displacement
means.
.
.
, Anobject of this invention is a gearless rotary
displacement device'of the alternately accelerat
f5. ing pistonytype which is ,of simple construction,
has no parts awkward to manufacture or as
semblevand-in which‘the yparts subject to ac
celeration stresses in operation are of less weight
and. size >than in former. displacement 4devices
ofv this type.
.
.
A device .embodying the invention has the
feature that the fluids rhandled thereby are not
brought into contact with a large area of sta
tionary chamber as heretofore but instead the
walls of the chamber are movable with the pis
tons, thus minimizing the temperature diiîer
ences which occur between points of high and low
pressureyin suchv units. Also, the various ele
ments may be compactly arranged within the
confines of the piston path in such manner that
` the device is of but slightly greater width than
the width of the pistonchambers.
' Other objects, novel featuresv and advantages
of this invention will become apparent from the
following specification and accompanying draw
ings, wherein:
~
, Fig. 1 is anaxial section through an embodi
ment of the invention;
,
. Fig. 2 is asection on the line 2-2 of Fig. 1;
Fig_._ 3 is a section on the line 3-3 of Fig. 1
30
` with thel crank shaftadvanced 45°.
Fig. 4-'is vanrexploded perspective view of a
portion of `the device;
_
Figs. 5 and 6 are perspective views of differ
ent parts of the device;
,
„_ Fig. '7. is an axial section through a modified
form of the invention;
i
, ,
Fig. 8 is a section on the line 8-8 of Fig. 7;
_- `Figi!) is a section on the line 9_9 of Fig.v 7
with the crank shaft advanced 221/2", and
Fig. 10 is a fragmentary view similar to Fig. 1 of
a modification.
l
Referring now to Figs. 1 to 6 in which the
inventionis disclosed> as embodied in a displace
45
ment device having two sets of rotary pistons, a
metal cylinder I0 `is provided with end plates II
topform a casing, the end plates being clamped
to the cylinder by `means of the` bolts I2 and
vnuts I3. A'crank shaft I4 having a crank pin I5
50
is'jour'n'alled in hubs I6 extending'fromvthe plates
I I and is provided with the usual counterweights
.55
ITI. ¿A bushing I8 surrounds the crank pin I5
and constitutes a bearing for a rotatable member
I9,> provided with two sets of disks 20 eccentric
_to the crank _pin to an extent equal to the Vcrank
ciated bearing pad is shown in detail in Fig. 4,
the remainder of the member I9 being omitted. 5
In offsets provided in the end plates I I are fixed
annular members 22 (Fig. 6) and these members
are provided with annular shoulders 22a` con
centric with the crank shaft, the end of each
shoulder being shaped to form a rectilinear 10
guideway 33 extending diametrically across the
annular member.
In each guideway 23 is'pro
vided a block 243 having an aperture in which is
received an eccentric disk 2i] and each block is
limited to rectilinear movement by its associated l 5
guideway.
Cylindrical members 25 (Fig. 5) are rotatably
mounted on the shoulders 22a. with the adjacent
edges in Contact and each cylindrical member is
provided with a flange 250!l slidably engaging the
inner face of an end plate I I. A cylindrical seal
ing band 26 overlies said cylindrical members
25. Each cylindrical member 25 is provided with
a diametrically arranged rectilinear guideway 21
and in each guideway is slidably arranged .a block
28 having an aperture enclosing the member I9 in
alinement with a bearing pad 2 I, a portion of the
aperture surface being of> the proper curvature to
journal a bearing pad 2I, While the remainder
of the aperture is of such size and shape as to 30
permit limited relative rotary movement between '
the block 28 and the member I9 while preventing
any relative rectilinear movement.
In the circular channel defined by the band 26
and flanges 25a are provided two pairs of pistons
29 and 33, one pair of pistons being fastened to one
flange 25aand the other pair of pistons being
connected to the other flange 25a. To each pair
of pistons'is fastened a ring 3I which snugly
encloses a flange 25a and engages an end plate 40
II, thereby forming with the ilanges 25a and
cylinder IU a ring cylinder. The pistons 29 and
3i] are attached to the ilanges 25a by means of
boltsV 32 in the pistons passing through lugs 33
extending from the flanges into the pistons
while the rings 3| are attached to the pistons 29
and 3D by bolts 34 in the pistons passing through
lugs 35 extending from the rings into the pistons.
Rotation of the crank shaft Ill- causes move
ment of the axis of the member I9 through a cir
cular orbit having the crank shaft axis. as its
center and the member I9r is caused to rotate
twice about the axis of the crank pin or once
with respect to the casing in the opposite direc
tion to the direction of rotation» of the crank 65
2
2,132,596
shaft for each complete revolution of the crank
shaft, such rotation being effected through the
interaction of the rectilinearly movable blocks
24 and the eccentric disks 20'. The cylindrical
members 25 are rotated by the member I9 in
the same direction with it but with continuous
relative rotary movement between said cylindri
cal members. The relative rotary movement of
the members 25 results from variation in the
10 coupling leverage between the member I9 and
cylindrical members 25 through the bearing pads
tween pistons to move apart the cylindrical
members 25 and place undue loads on the bear
ings therefor. To assist in this purpose, the lat
eral area of the rings exposed to said pressure is
so chosen as to be substantially equal to the area
of the flanges 25a exposed to such pressure in
the opposite direction. Also, the provision of
moving side walls for the ring cylinder minimizes
temperature differences between points of high
and low pressure.
10
In Figs. 7 to 10 inclusive is disclosed a modi
2| and blocks 24, such variation resulting from ñed form of the invention which contains four
movement of the axis of member I9 through the sets of pistons. The casing or stator is com
orbit traversed by the crank pin with simultane
posed of two plates I || fastened together by bolts
15 ous rotation of the cylindrical members about
|| 2. A crank shaft ||4 having a crank pin ||5
the crank shaft axis, such coupling leverage var
is mounted in hubs ||6 in the plates || |. The
iation being apparent from comparison of Figs. crank shaft is provided with the usual counter
2 and 3. The pistons 29 and 30 are moved rela
weights ||`| and a bushing ||8 on the crank pin
tive to each other during rotation of the members
constitutes a bearing for a rotatable member ||9
20 25 to cause variation in the spacing between adja
provided with four eccentric disks |20, two at
cent ends of successive pistons thereby forming _ one end and two at the other, the two disks at
varying size chambers for the suction, compres
each end being oriented 180° from each other
sion and exhausting of ñuids with respect to the
and also provided between the two pairs of disks
stator or casing.
with four bearing pads |2| which are succes
In the use of the displacement device above sively oriented 90° from each other. An annular
25
described as an internal combustion engine, an member|22 is ñxed to each end plateconcentric
inlet 36 and outlet 3l are provided, together with with the crank shaft and has two diametrically
a combustion chamber 38 in the wall of which is arranged guideways |23 at right angles to each
mounted a spark plug 39. Combustible gases are other in which are provided slidable blocks |24
30 drawn in through the inlet 36 between the adja
having apertures receiving the eccentric disks |20.
cent pistons, compressed as the pistons draw to
Cylindrical members |25 are rotatably mount
gether and then transferred into the combustion ed on the annular members |22 and cylindrical
chamber 38 as the trailing edge of the leading members |26 are rotatably mounted on the cylin
piston uncovers the entrance thereto. Immedi
drical members |25. Each of these cylindrical
35 ately after the compressed gases have been trans
members has a diametrically arranged guideway
ferred into this chamber, the leading edge of the in which is slidably mounted a block |28 in aline
leading piston closes off the gas exit from the ment with a bearing pad |2 |, the block having an
combustion chamber. In the interval between aperture enclosing the member ||9, a portion of
the admission of the compressed gases into the the aperture surface being of the proper curva
40 combustion chamber and the closing off of the ture to journal the bearing pad while the re
chamber, scavenging of the chamber of dead mainder of the aperture is of such size and shape
combustion gases is effected by the fresh charge. as to permit limited relative rotary movement
Thecharge of combustible gases in the combus
between the block |28 and the member ||9 while
tion chamber is ignited and the combustion gases .preventingA any relative rectilinear movement.
45 act as a wedge between the two adjacent pistons
The cylindrical members |25 and |26 are provided
to force them apart and due to the ratio advan
with flanges which co-operate to form an annu
tage the leading piston has over the following lar channel, the flanges of the members |25 con
one, the combustion gas causes rotation of the stituting the upper half of the side walls of the
shaft of the engine by forcing the pistons apart channel and the flanges of the members |26 con
50 thus completing the cycle.
stituting the lower half of the side walls of such
The disks 20 have been shown as oriented 180°
from each other with a bearing pad 2| diametri
cally opposite each disk but other relationships
of these elements may be made use of.
Also,
55 while the guideways 23 have been shown as being
arranged at right angles to each other, other
degrees of orientation of these guideways is con
templated. Any number of pairs of pistons great
er than one may be used so long as the angular
60 relationship each pair bears to its respective
guideway 2'| is such that when this angular
relationship equals zero degrees between one set
of pistons and its guideway, the remaining pairs
have an angular relationship in degrees equal to
65 plus and minus 180 divided by the number of
pairs of pistons and plus and minus twice this
number of degrees and so on until each pair of
pistons has had determined its angular relation
70
ship with its respective guideway 21.
'
The rings 3| serve as part of the walls of the
chamber in which the pistons rotate and assist
in the location of the pistons with respect to each
other and other parts of the device and more
readily act to neutralize or balance out any tend
ency there may be for pressure in the spaces be
channel.
In the channel just described are ar
15
20
25
30
35
40
45
50
ranged four pairs of pistons |30, each pair of
pistons being connected to one of the cylindrical
members |25 and |26.
y
Rotation of the crank shaft ||4 causes rotary
movement of the pistons in the opposite direc
tion at varying speeds between a maximum and
a minimum as previously described so that the
adjacent faces of successive pistons continuously
move toward and away from each other to form GU
chambers of Varying capacity.
One use of the apparatus above described is as
a combination motor and compressor.
When so
used, expansible fluid is introduced through the
inlet port |31 and discharged through the outlet 65
|36 and acts upon the pistons to cause rotation
thereof. The rotary movement of the pistons is
then used to draw in the fluid to be compressed
through the inlet |39 and carry such fluid over
to and discharge the same through the outlet 70
|38.
'
In the modification illustrated in Fig. l0, the
rings 3| are provided with flanges 3|a extend
ing inwardly toward each other and engaging the
cuter surfaces of the pistons. The inner` ends 75
2,132,596
3
of the flanges are sufficiently spaced to permit
>and connecting member While preventing rela
the passage of fluid into and out of the cham
tive rectilinear movement thereof.
4. In an apparatus of the character described,
a‘ crank shaft having a crank pin, rotatable
members coaxial with said crank shaft, a pair
of pistons carried by each rotatable member, an
bers defined by adjacent pairs of successive pis
tons through the inlet and outlet ports which
are shaped to conform to the spacing between
the ñanges. Except at the ports a shoulder Ißa
extends between theedges of the ñanges.
I claim:
‘
1. An apparatus of the character described
10 comprising a crank shaft having a crank pin,
rotatable cylindrical members coaxial with said
crank shaft and having radial rectilinear guide
ways, a pair of pistons connected to each cylin
drical member, an annular chamber housing said
pistons and having inlet and outlet ports, a
connecting member rotatably mounted on said
crank pin and provided With an arcuate bearingl
pad for each cylindrical member, means for ef
fecting rotation of said connecting member> twice
about the crank pin for each rotation of the
crank shaft counter to the direction of rotation
of said crank shaft, and a block slidably asso
ciated with each guideway in alinement with each
bearing pad and having an aperture surround
25 ing said connecting member, a portion of the ap
erture surface being of proper curvature to jour
nal the bearing pad and the remainder of the
aperture being of such size and shape as to per
mit limited relative rotary movement between
30 said block and connecting member while pre
venting relative rectilinear movement thereof.
2.y An apparatus of the character described
comprising a crank shaft having a crank pin,
rotatable cylindrical members coaxial with said
crank shaft and having radial rectilinear guide
ways, a pair of pistons connected to each cylin
drical member, an annular Àchamber housing
said pistons and having inlet `and outlet ports,
a connecting member rotatably mounted on said
crank pin and provided with an arcuate bearing
annular chamber housing said pistons and hav
ing inlet and outlet ports, circular means rotat
ably mounted on said crank pin eccentrically
thereof, means to guide said circular means 10
bodily back and forth along a rectilinear path,
and interconnections between said circular means
and said rotatable members for rotating the lat
ter by the former with alternate acceleration and
15
deceleration of said pairs of pistons.
5. An apparatus of the character described
comprising a crank shaft having a crank pin,
a connecting member rotatably mounted on said
crank pin, means for eñecting rotation of said
connecting member twice about said crank pin 2 0
opposite to the direction of rotation of said crank
shaft for each rotation of the crank shaft, ro
tatable members coaxial with said crank shaft
and having radial rectilinear guideways, a block
slidable iny each guideway, means pivotally con 2 5
necting each block to said connecting member,
iianges on said rotatable members defining a
channel, a pair of pistons connected to each
ñange, a ring surrounding each flange and con
nected to one of said pairs of pistons, an an
30
nular chamber surrounding said pistons having
its side Walls composed of said flanges and rings,
and inlet and outlet ports for said chamber.
6. Apparatus ofthe character described com
prising a crank shaft having a crank pin, ro
35
tatable members coaxial with said crank shaft,
ñanges on said members defining a channel,
pairs of pistons arranged in said channel, con
nections between each pair of pistons and a
flange, a ring surrounding each flange and con 40
nected to one of said pairs of pistons, an annular
pad for each cylindrical member, means for ef
fecting rotation of said connecting member on chamber surrounding said pistons having its side
the crank pin, said means comprising eccentric l walls composed of said flanges and rings, inlet
disks forming part of said connecting member and outlet ports for said chamber, and means
connecting said rotatable members to said crank
45 and rectilinearly movable bearings for said disks,
shaft for effecting rotation of said members coun
and a block slidably associated with each guide
ter to the crank shaft with alternate accelera
Way in alinement with each bearing pad and hav
ing an aperture surrounding said connecting tion and deceleration of said members.
7. Apparatus of the character described com
member, a portion of the aperture surface be
ing of proper curvature to journal the bearing‘r prising a crank shaft having a crank pin, a pair
pad and the remainder of the aperture being of rotatable members coaxial with said crank
shaft, an outwardly extending flange on each
of such size and shape as to- permit limited rela
tive rotary movement between said block and rotatable member, a ring surrounding each
connecting member while preventing relative flange, a pair of pistons connected toI each flange
and the ring associated with the remaining
rectilinear movement thereof.
3. An apparatus of the character described flange, an annular chamber housing said pistons
comprising a crank shaft havinga crank pin, having its side walls composed of said ñanges
rotatable cylindrical members coaxial with said and rings, inlet and outlet ports for said cham
ber, and means connecting said rotatable mem
crank shaft and having radial rectilinear guide
bers
to said crank shaft for effecting rotation of
Ways,
a
pair
of
pistons
connected
to
each
cylin
60
drical member, an annular chamber housing said said members counter to the crank shaft with al
pistons and having inlet and outlet ports, a ternate acceleration and deceleration o-f said
connecting member rotatably mounted on said members.
8. Apparatus of the character described corn
crank pin and provided with an arcuate bearing
pad for each cylindrical member and ’eccentric prising a crank shaft having a crank pin, a pair
circular means, meansk to guide said circular of rotatable cylindrical members coaxial with
means bodily back and forth along a rectilinear said crank shaft and having radial rectilinear
path, and a block' slidably associated with each guideways, a flange extending outwardly from
guidevvay in alinement with each bearing pad each cylindrical member, a ring surrounding
each iiange, a pair of pistons connected to each
and having an aperture surrounding said con
Bange and the ring associated with the remain
necting member, a portion o-f the aperture sur
face being of proper curvature to journal the ing flange, an annular chamber surrounding said
bearing pad and the remainder of the aperture pistons having its side walls composed of said
being of such size and shape as to permit limited flanges and rings, inlet and outlet ports for said
relative rotary movement between said block chamber, a connecting member rotatably
45
50
55
60
.
7
n
4
2,182,596
mounted on said crank pin and provided with an
arcuate bearing pad for each cylindrical mem
ber and an eccentric disk, _means to guide said
disk bodily back and forth along a rectilinear
path, and a block slidably associated with each
guideway in alinement with each bearing padl
and having an aperture surrounding said con
necting member, a portion of the aperture sur
face being of proper curvature to journal the
10 bearing pad and the remainder of the aperture
being of such size and shape as to permit limited
relative rotary movement between said block and
connecting member while preventing relative
rectilinear movement thereof.
15
9. Apparatus of the character described com
prising a crank shaft having a crank pin, a con
necting member rotatably mounted on said crank
pin, means for effecting rotation of said con
necting member twice about said crank pin op
20 posite to the direction of rotation of said crank
shaft for each rotation of the crank shaft, a pair
25
30
35
40
45
of cylindrical members coaxial with said crank
shaft and having radial rectilinear guideways, a
blcckrslidable in each guideway, means pivotally
connecting each block to said connecting mem
ber, an outwardly extending flange on each cy
lindrical member, a ring surrounding each flange,
a pair of pistons connected to each flange and
the ring associated with the remaining flange,
an annular chamber surrounding said pistons
having its side walls composed of said flanges and
rings, and inlet and outlet ports for said cham
ber.
10. Apparatus of the character described com
prising a crank shaft having a crank pin, a pair
of rotatable cylindrical members coaxial with
said crank shaft and having radial rectilinear
guideways, a flange extending outwardly from
each cylindrical member, a ring surrounding each
flange, a pair of pistons connected to each flange
and the ring associated with the remaining
flange, an annular chamber housing said pis
tons having its side walls composed of said flanges
and rings, inlet and outlet ports for said cham
ber, a connecting member rotatably mounted on
said crank pin and provided with an arcuate
bearing pad for each cylindrical member, means
for effecting rotation of said connecting member
twice about the crank pin for each rotation of
50 the crank shaft counter to the direction of ro
tation of said crank shaft, and a block slida
bly associated with each guideway in alinement
with each bearing pad and having an aperture
surrounding said connecting member, a portion
of the aperture surface being of proper curva
ture'to journal the bearing pad and the re
mainder of the aperture being of such size and
shape as to permit limited relative rotary move
ment between said block and connecting member
60 while preventing relative rectilinear movement
thereof.
11. An apparatus of the character described
comprising a crank shaft having a crank pin,
rotatable cylindrical members coaxial with said
65 crank shaft and having rectilinear guideways,
flanges on vsaid cylindrical members, a pair of
pistons connected to each flange, a ring sur
rounding each ilange and connected to one of
said pairs of pistons, an annular chamber sur
70 rounding said pistons having its side walls com
posed of said flanges and rings, inlet and outlet
ports for said chamber, a connecting member
rotatably mounted on said crank pin and pro
vided with an arcuate bearing pad for each cy
75 lindrical member, means for effecting rotation of
said connecting member twice about the crank
pin for each rotation of the crank shaft counter
to the direction of vrotation of said crank shaft,
and a block slidably associated with each guide
way in alinement with each bearing pad and hav
ing an aperture surrounding said connecting
member, a portion of the apertured surface be
ing of proper curvature to journal the bearing
pad and the remainder of the aperture being of
such size and shape as tov permit limited relative 10
rotary movement between said block and bearing
pad while preventing relative rectilinear move
ment thereof.
'
l2. An apparatus of the character described
comprising a crank shaft having a crank pin, 15
rotatable cylindrical members coaxial with said
crank shaft and having radial rectilinear guide
ways, flanges on said cylindrical members, a pair
of pistons connected to each flange, a ring sur
rounding each flange and connected to one of 20
said pairs of pistons, an annular chamber sur
rounding said pistons having its side walls com
posed of said flanges and rings, inlet and outlet
ports for said chamber, a connecting member
rotatably mounted on said crank pin and pro 25
vided with an arcuate bearing pad for each cy
lindrical member, means for effecting rotation of
said connecting member on the crank pin, said
means comprising eccentric disks forming part of
said connecting member and rectilinearly mova 30
ble bearings for said disks, and a block slidably
associated with each guideway in alinement with
each bearing pad and having >an aperture sur
rounding said connecting member, a portion of
the aperture surface being of proper curvature 35
to journal the bearing pad and the remainder of
the aperture being of such size and shape as to
permit limited relative rotary movement between
said block and connecting member while pre
venting relative rectilinear movement thereof.
40
13. A device of the character described includ
ing in combination, a hollow cylindrical’stator
including an annular chamber having inlet and
outlet ports, two or more sets of pistons rotata
bly mounted in said stator for movement in said 45
chamber and capable of a certain amount of ro,
tation independently of each other as well as
rotation in said stator as a group and means for
alternately speeding and slowing each set of pis-l
tons to vary the spacing between adjacent pis 50
tons, said means including a crank shaft having
a crank pin, a connecting member rotatably
mounted on said crank pin and provided with an
eccentric disk, and means to guide said disk back
and forth along a rectilinear path for effecting 55
rotation of said connecting member twice about
the crank pin for each rotation of the crank
shaft and counter to the direction of rotation of
said crank shaft.
14. A device of the character described in 60
cluding in combination, a stator including an »
annular chamber having inlet and outlet ports,
a shaft therein, pistons rotatably mounted in said
stator for movement in said chamber coaxial with
said shaft, said shaft havingr a crank member. a 65
connecting member on said crank member, com- .
bined eccentric and reciprocating means for ef
fecting rotation of said connecting member on
said crank member, and means connecting said
vconnecting member Vand said pistons for alter 70
nately speeding and slowing of said pistons.
15. A device of the character described includ
ing in combination, a stator including an annular
chamber having inlet and outlet ports, a shaft
therein, pistons rotatably mounted in said stator
5
2,132,596
for movement in said chamber coaxial with said
20.Y Apparatus'of the character described com
shaft, said shaft having a crank member, a con
necting member on said crank member, com
bined eccentric and reciprocating means for ef
fecting rotation of said vconnecting member on
prising a crank shaft having a crank pin, a disk
said crank member; said crank shaft, connect-`
ing member, and means for effecting rotation of
said connecting member comprising means of al
ternately accelerating and decelerating individual
10 sets of pistons.
16. An apparatus of the character described,
in combination, a stator including an annular
chamber having inlet and outlet ports, a shaft
having a crank pin rotatably mounted in said
15 stator, sets of pistons rotatably mounted in said
stator for movement in said chamber and means
for controlling the rotation of said sets of 'pistons
so as to cause alternate acceleration and decelera
tion of said pistons during the rotation thereof
rotatably mounted on said crank pin eccentrical
ly thereof, means for limiting said disk to bodily
reciprocating movement, a pair of rotatable mem
5
bers coaxial with said crank shaft, each rotat
able member having a circular portion coaxial
withrsaid crank shaft, a radial guideway on each
circular portion, blocks engaging said guideways,
and means pivotally connecting said blocks to 10
said disk, a pair of pistons connected to each r0
tatable member, an annular chamber housing
said pistons and inlet and outlet ports therefor.
21. Apparatus'of the character described com
prising a crank shaft having a crank pin, a plu 15
rality of disks rotatably mounted on said crank
pin eccentrically thereof and oriented relative to
each other, bearings in which said disks are jour
nalled, means confining said bearings to linear
reciprocating'motion, a pair of rotatable mem 20
rotatably mounted on said crank pin and com- ‘ bers coaxial with said crank shaft, a pair of
blocks, radial guide means on one rotatable mem
bined eccentric and reciprocating means for ro
tating said member in the opposite direction to ber engaged by one of said blocks, radial guide
means on the remaining rotatable memberíen
said shaft.
.
20 in said stator, said means including a member
25
1'7. An apparatus of the character described,
in combination, a stator including an annular
chamber having inlet and outlet ports, a shaft
having a crank pin rotatably mounted in said
stator, sets of pistons rotatably mounted in said
30 stator for movement in said chamber and means
for controlling the rotation of said sets of pistons
so as to cause alternate acceleration and de
celeration of said pistonsduring .the rotation
thereof in said stator, said means including a
>member rotatably mounted on said crank pin and
combined eccentric and reciprocating means for
rotating said member in opposite direction to said
shaft, said eccentric and reciprocating means in
cluding an eccentric disk attached to said mem~
40 ber and a slidable block supported by saidstator
`with said -eccentric> disk borne in said slidable
block.
18. Apparatus of the character described com
prising a crank shaft having a crank pin, a disk
45. rotatably mounted onsaid crank pin eccentrical
ly thereof, means for limiting said disk to bodily
reciprocating movement, a pair of rotatable
members coaxial with said crank shaft, a pair of
blocks, radial guide means on one rotatable mem
50, ber engageable by one of said blocks, radial guide
means on the remaining rotatable member en
gaged by the remaining block, means pivotally
connecting said'blocks to said disk at equal dis
tances from the crank pin axis and in alinement
gaged by the remaining block, means pivotally 25
connecting said blocks to said disks at equal dis
tances from the crank pin axis and in alinement
therewith, a pair of pistons connected to each
rotatable member, an annular chamber housing
said pistons and inlet and outlet ports for said 30
chamber.
`
22. In an apparatus of the character described,
a crank shaft having a crank pin, rotatable mem
bers coaxial with said crank shaft, flanges «on
said members defining achannel, pairs of pis 35
tons arranged in said channel, an annular charn
ber housing said pistons and having its side wallsr
composed in part of said flanges, inlet and outlet
ports for said chamber connections between each
pair of pistons and one ñange, circular means 40
rotatably mounted on said crank pin eccentrical
ly thereof, means to guide said circular means
bodily back and forth along a rectilinear path,
and interconnections between said circular means
and said rotatable members for rotating the lat 45
ter by the former with alternate acceleration and
deceleration of said pairs of pistons. v
k23. In an apparatus of the character described,
a crank shaft having a crank pin, rotatable mem
bers coaxial with said crank shaft, flanges on said 50
members defining a channel, a pair of pistons
connected to each flange, a ring surrounding each
flange and connected to one of said pairs of- pis
tons, an annular chamber housing said pistons
55 therewith, a pair of pistons connected to each f and having its side walls composed of said flanges
rotatable member, anv annular chamber housing
said pistons and inlet and outlet ports therefor.
and rings, inlet and outlet ports for said cham
ber, circular means rotatably mounted on said
crank pin eccentrically thereof, means to guide
19. Apparatus of the character described, com
prising a crank shaft having a crank pin, a disk l said circular
a rectilinear
60 rotatably mounted on said crank pin Aeccentrical
said circular
ly thereof, a reciprocating member having an ap
for rotating
. erture in which said disk is'journalled, a pair of
means bodily back and forth along
path, and interconnections between 60
means and said >rotatable members
the latter by the former with al
rotatable members’coaxial with said crank shaft,
ternate acceleration and deceleration of said
a pair of blocks, radial guide means on one ro
pairs of pistons.
65 tatable member engaged by one of said blocks,`
radial guide means on the'remaining rotatable
member engaged by the remaining block, means
vpivotally connecting said blocks to said disk> at
equal distances from the crank pin axis and in
70 alinement therewith, a pair'of pistons connected
to each rotatable member, an annularv chamber>
lhousing said pistons, and inlet and outlet ports
for said chamber.
-
24. Apparatus .according to claim 6 in which a 65
cylindrical band coaxial with said crank shaft
extends between said flanges to constitute the
inner wall of said annular chamber housing the
pistons. .
.
CHARLES» BANCROFT.
70
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