2,41,477 D. BLUMBER'G ; TWO ‘CYCLE ENGINE Filed Aug. 20, 1943 5 Sheets-Sheet 1 I INVENITOR DA ‘(/0 BL 0445a‘; Nov. 5, 1946. D. BLUMBERG 2,410,”? TWO CYCLE ENGINE Filed Aug. 20, 1943 5 Sheets-Sheet 2 WOT. NLQ MN m33 MW v.12 MIN. ' INVENTOR 0/; W0 5/. (M15596 NOV. 5, 1946. D_ BLUMBE'RG 2,41@,477 TWO CYCLE ENGINE Filed Aug. 20, 1943 s Sheets-Sheei L's ’ ‘ N a; $8 33 Q Q 33 m L \ n a v.3 N ‘15 $4 N N : o m °‘_ ‘ (‘W 3": ‘a J. ._I 3v-————; " §" ‘if - _I \ m w o g “'3 N w x g :1’. § 3 u, ? \A it a 1 HI: - v h ‘: R P ‘Y (4", '0 § ** _ 8 \ ' ' '5 §-' 0 § F n k N “‘ ' \n “3 . *1’ S N g § m g m N (a A\\‘ I"; v IF N _ & m \ l\ , % a ‘ k3 INVENTOR DAV/D BLUMBEEG ' BY 7 / - . ' ' . Now. 5, 1946. v D. BLUMBERG ' TWO CYCLE ENGINE 2,410,477 I Filed Aug. 20,‘ 1943 5 Sheets-Sheet 4 R Y INVENTOR D4 V/D B1 UMBEBG BY / ATTORNEY Nov. 5, 1946. 2,410,477 D. @BLUMBERG TWO CYCLE ENGINE ‘ Filed Aug. 20, 1943 5 Sheets-Sheet 5 " v ‘ mvam'oz - vDA V/D BLUMEEEG v ‘ Patented Nov. 5-, 1946 ' 2,410,477 UNITED STATES f PAT-BN1!‘ vclerics 2,410,477 _ TWO-CYCLE ENGINE David Blumberg, Bridgeport, Conn. Application August 20, 1943, ‘Serial No. 499,315 4 Claims. _(Cl. 123-51) 1 ' 2 - This invention relates to new and useful im - provements in internal combustion engines and‘ has particular relation to a two-cycle engine. Among the objects of the~invention are to pro vide in an engine of the type indicated means for GI . thoroughly scavenging the engine cylinder of burned gases, means for forming a large explosive charge in the engine cylinder, an engine of sim ple construction involving but a relatively few parts, and an improved power take-off means for 10 the engine whereby with a number of the en gines operating in a bank any one or more may be stopped without imposing a. heavy drag onthe ‘ . others. Other objects and advantages will become ap parent from a consideration of the following de tailed description taken in connection with the; accompanying drawings wherein a satisfactory 15 ends and provided at spaced points with raised .or radial ?ange-like portions ll, l2, l3, l4, l5 and Hi the purpose of which will appear. The respective ends of the cylinder III are closed by heads I] and I8 bolted or otherwise secured in place. ,An intake port i9 is provided in head I1 and communicating with said port is a fuel sup; ply pipe 20. .A valve 2| controls the port l9 and at the proper times is maintained seated by a coil spring 22 disposed about the stem of the valve. Head 18 is provided with an intake port 23 with which communicates a fuel supply pipe 24. A valve 251controls the port 23 and is adapted to be seated at the proper times by a' coil spring 26 disposed about the stem of the valve. - Members 21 and 28 are disposed in spaced re lation about the intermediate portion of the cyl inder Ill and are securedvagainst the opposing faces of the radial ?anges l3 and M respectively. ' it is to be understood that the invention is not 20 The members may be in two or more pieces and limited to'the details disclosed but includes all are bolted, welded or ‘otherwise formed into units‘ such variations and modi?cations as fall within ‘ and in any similar manner secured tight to-said the spirit of the invention and the scope of the A water jacket 29 is secured in spaced appended claims. ' ' relation to the main walls of the cylinder- In by In the drawings: 25 being secured to the ?anges H--l2 and l5—l6 Fig. 1 is a top plan view showing the engine as shown in Figs. 2 and 3. Water supply and of the invention; return pipes 30 and 3! are shown as connected Fig. '2 is a horizontal central sectional view ‘ with the water jacket at the respective sides of I ' through the engine; the central or intermediate portion of the cylin Fig. 3 is a view with the engine casing in ver der ill (see Fig.3). } I tical section but with the piston structure in ele At the underside of the engine an oil pan 32 embodiment of the invention is shown. ' However, ‘ may be bolted at 33 to the lower portions of the members-27 and 28 and at such side the mem section and showing the piston construction (and bers. are provided with v?anges 34 having holes crank means alone; ' 35 35 for .the passage of anchoring bolts or the like vation; ' ' -_ Fig. 4 is a view partly in plan and partly in Fig.5 is a perspective view of one part of th - crank means alone; ' ' Fig. 6 is a quarter section view of the switch controlling energizing of the spark plug; Figs. '7 through 11 are schematic views show ing the various positions of the crank means; ‘Fig. 12 is a side elevational view of‘ the engine _ cylinder alone; ' Fig. 13 is an elevational view of the block‘used - in mounting the crank means; Fig. 14 is a similar view but taken at right . anglestoFig. 13; . > Fig.'15 is a detail elevational view looking at the underside of the engine cylinder as suggested ‘ bythe line l5-l5ofFig. 12; and . ' to be used in securing the engine to any suitable ‘ base (not shown). A plate ‘36 is seemed to and between the upper portions of the members 21 and 28 as by bolts 31 and such plate toward each side of the engine has a pin 38 passing there through. About each pin is a coil spring 39 bear ing at its respective ends against a head 4010f .' the pin and’ a socket provided in the plate and 45 receiving the inner end of the spring. . These pins enter ‘into the starting of the engine as will later appear and the pins are normally held in elevated positions by the springs 39. The heads of the respective pins are engaged by roll 50 ers' M on the respective arms 42 and 43 of a. rocker device generally designated 44 (see Fig. 1) pivotally mounted on a bar 45 carried by bearing members or lugs it on the upper side of the plate Referring in detail to the drawings the engine 36. A manual means 41 is provided for pulling ,of the invention is shown as including a one ' piece casing or cylinder 10 open through both 56 to pivot the rocker 44 on bar 45 to depress the Fig. 16 is a transverse sectional view taken as _ along the line IG-l 6 of Fig. 12. 2,410,477 4 pins 38 against the tendency of the coil springs arms 12 is a cylindrical bushing 85 received in an annular block 86 having an opening 851 there 39. through for such bushing. Block 86 has ?anges Spark plugs 48 and 48 are threaded through thickened cylinder side wall portions 58 and 5| 88 which bear against the inner surfaces or the respectively and enter the cylinder toward but (.1 skirt of piston 8| as best shown in Figs. 2 and 4 spaced from the heads I? and I8. Firing of the and the block is movable as a unit with the pis plugs is controlled by similar switches 52 and tons. A pair of holes 89 and 98 communicate 53 located at the ends of the cylinder and mount the opening 81 through the block 88 with the ed‘ by the heads I‘! and I8. These switches interior of the piston skirts at the respective sides are normally in open circuit relation and are 10 of the block. These ‘openings pass not only closed by a ?ring chamber head as the lat through the block but also through the bush ter reaches the end of its compression stroke. ing 85. Each switch (see Fig. 6) includes a threaded Inner cylindrical liners 9| and 92 in the skirts outer metal shell 54 adapted to be screwed into 82 and 83 respectively, bear against the ?anges a, tapped hole in the cylinder. Within said metal 88 of‘the block 86 and such liners toward their shell is a body 55 of insulating material mount outer ends are provided with holes 93 and 84, ing a pair of spaced contacts 55 and 51 con‘ respectively. When the engine is assembled the nected by wires 58 and 58 with binding posts free ends of the cranks ‘I2 are in, or substantial 68 and BI respectively. Such posts are" car ly in, abutting aligned relation as in Figs. 2 and 4 ried by the body 55 and exposed at the outer and through such cranks extends an opening 85. . end of the metal shell 54. A lead 52 from a bat Such opening through radial openings 96 com tery or the like (not shown) is connected with municates with arcuate channels or grooves 8‘! binding post'68 while a similar lead 63 connects in the surface portions of the cranks and which the binding post 6| with the center electrode of in certain positions are in communication with a spark plug. , ' the respective openings 89 and 98 through the Located Within the metal shell 54 beyond the block 86 and bushing 85 entering the cylinder inner end of the insulating body 55 is a contact I8 at opposite sides of said block. Outwardly of the respective pistons 88 and 8| are ?ring chamber heads 98 and 88. Rigid} with or circuit closing means in the form of a head 84 normally held away from contacts 58 and 51 by a coil spring 66. A rod 81 projecting from said head 64 passes out through the shell wall 85 and may be provided with a small head 88 for engagement by a ?ring chamber head for the closing of the switch to energize a spark plug. 30' As shown best in Fig. 3 the rod 5‘! and its head ' 88 project slightly into the engine cylinder to‘ be engaged by the mentioned ?ring chamber head at the time above indicated. When so en ‘ the respective heads 98 and 99 are skirts I88 and I8I passing through the pistons 88 and 8|, re spectively, and engaged by packing or piston rings I82 as they so pass. At ‘their inner ends the skirts I88 and I8I are provided with annular outwardly enlarged portions I83 and I84, respec tively, carrying piston rings bearing on the in ‘ ner surfaces of the skirt liners 9| and 92, re spectively. gaged the rod and its head are pushed outwardly Within the skirts I88, and IM are annular of the cylinder I8 and inwardly of the metal shell 40 members I85 and I85, respectively, held against 54 and the head 84 is moved against the tend shoulders I8‘I of the skirts by bolts I88 where ency of the coil spring 68 and into engagement by such members have a ?xed relation to the with the contacts'58 and 51 closing the circuit heads 98 and 98, respectively, and are movable through them and thus to a spark plug. with such heads and their skirts. Members I85 In its opposite sides the cylinder- I8 is provided and I86 are provided each with a valve seat with longitudinally extending slots 59 in which for the valves I89 and‘ I I8 of the respective mem operate portions of a crank mechanism. The bers and which valves are normally urged to crank mechanism orpower take-oil means com ward their seats by. coil springs III disposed . prises a pair of similar means generally desig about the stems of the valves; Openings H2 nated ‘I8 and ‘II and of which the means 18 communicate the space between the members is shown alone in perspective in Fig. 5. |85 and I88 and the respective ?ring chamber Such means includes a crank shaft ‘I2 con heads and within the skirts I88 and IM with the nected by a web 18 with a. head, shown as a spaces H3 and II3a between the respective pairs disc 15. Web 74 and crank 12 are at one side of heads but at the outer sides of said skirts. of the disc 75 and extending from the other Through the firing head 98 are one or more side thereof in‘ rigid concentric ‘relation there passages I I4 communicating the outer side of said with is a drive shaft ‘I8. Web ‘I4 is pivotally head with the space II 5 located centrally of the connected with the disc 15 in eccentric relation innenside of such head while a similar passage thereto as at ‘IT and such'pivotal connection is IIS provides communication between the outer located intermediate the ends of the web. At its 60 side of the ?ring chamber head 99 and the space end remote from. the crank ‘I2 the web mounts II‘! at the inner side of- such head. A valve in a roller ‘I8 the purpose of which will be set forth. cluding an inverted cup-like part I I9 controls the As suggested the crank mechanism is dupli passages H4 and a similar valve I28 controls the cated at each side of the cylinder I8 and it ‘is passages II6. These valves are normally held in operated or driven by a double piston construc 65 positions closing the respective passages by coil tion located within the cylinder and generally springs I2I but are adapted to be forced off their designated 19. Such construction comprises a seats by pressure to permit of the movement of pair of piston heads 88 and 8| each in the form. fuel from the outer to the inner sides of the re of an annulus and provided with a skirt portion spective ?ring chamber heads. designated 82 and 83, respectively, telescoping 70 Exhaust ports I22 and I28 in the respective at their inner ends as at 84 and provided with end portions of cylinder I8 communicate with side holes receiving the cranks ‘I2. The tele annular passages I24 and I25, respectively, formed ' scoped portions of skirts 82 and 83 are rigidly ~ by the cylinder ?anges I2—-I3 and I4-I5 and connected. Within said skirt portions and about the crank cover members I26. Suitable exhaust pipes I2'I may be connected with the mentioned'armular 2,410,477 5 ~ . passages and the number of exhaust ports- en tering such passages may be varied. When the engine is assembled the webs ‘I4 of the crank mechanism are received in the members 21 and 29 at the sides of the cylinder I9 and the discs'I5 are also located between such members. The shafts ‘I6 are disposed in bearings‘ I2‘I each - mounted by an annulus I29 held in such members by .bolts I29. Each, annulus has a cover plate I39 bolted or otherwise secured thereto‘ and main taining the mentioned bearing means in place. In its intermediate portion the bottom wall of the cylinder I9 is provided with a pair of spaced This movement of firing chamber head 99 re sults in the Intake valve 25 being drawn open or unseated againstthe tendency of its coil spring ‘ and fuel from the supply pipe 29 is drawn into the cylinder between the head 99 and the head I8. ‘Valve I29 remains seated at this time as there is no pressure to force it inwardly from its‘ seat and it is preferred that the same be held on its seat under a pressure of approximately two pounds. I _ As the ?ring chamber head 99 and its skirt and member I96 are drawn inwardly by the ex pansion of the compressed air in the chamber I37 longitudinally extending slots I3I and I32. The the air in chamber I 39 is slightly compressed and spacing of these slots is the same as that of the 15 forces valve H9 from its seat. The air then es entrance openings I33 and I39 in the bottom of caping under the valve II 9 serves to. scavenge the block 89. Such entrance openings communi- ' the burned gases from the engine and it is also cate with the respective sides of the block through noted that the downward or inwardly movement 'of passages I35 and I39 respectively. Clearly when the ?ring chamber head 99 in the manner de the entrances I33'and I34 are in registry with scribed‘serves to move the burned'gases toward their slots air passages are established from the the exhaust port I23. Thus a thorough scaveng exterior of cylinder I9 to the interiors of the ing of the engine is accomplished. Valve H9 is skirts I 99 and IM of the ?ring chamber heads held on its seat with but a slight pressure, as, for 99 and 99. example, two ounces so that the valve readily In the operation of the engine assuming the ~ parts to be in the positions of Fig. 2 a'?ring stroke driving the piston construction ‘I9 toward the right has just been completed. _ The burned gases have been exhausted and scavenged through the port I22, a new charge has been drawn in through the intake port in cylinder head I1, and a charge has been compressed in the space II3a between the piston 8! and the ?ring chamber head 99 and is ready to be ignited. Fig. 3 shows the pis ton construction at the end of its stroke follow ing or resulting from the ?ring of the charge in I the space H311. ‘ ogaens to permit of passage of air from chamber When the heads 8i and 99 were moving in the direction just described the head 99 with its skirt and the ?ring chamber head 98 and its skirt were being moved toward the left as viewed in Fig. 2. 4 This is a compression stroke for the parts to the left of the cranks in Fig. 2 and the piston 89 and firing chamber head 98 move substantially as a unit since the inner ends of the skirt of each is positively moved by the block 99. In Fig. 2 it will be understood that the space H3 has been scavenged of burned gases and that a charge has been drawn into the space between (which space is in the form of an annulus) the the cylinder head I1 and the outer side of the ?r piston 8| is forced toward the left while the ?r 40 ing chamber head 99. Thus the air pressure has ing chamber head 99 together with its skirt I9I been exhausted from the chamber I49 within the _ and member I99 remains stationary. This re skirt I99 and the valve I99 closes. The air men sults in the compression of air in the annular ~ tioned ‘has been drawn into said chamber I99 space I31 between the liner 92 and the skirt I9I through passages 95 and 96 and groove 91 and and, due to the presence of the hole 99, between ‘» through slot I32, entrance I34 and passage I 36 the liner 92 and the skirt of piston 8|. Further in the block 89 during the power stroke of piston at this time air is admitted to the chamber I39 99. As the parts start to move the valve H9 re within the skirt I9I_ through the opening 95 in mainsclosed during initial movement» and until the crank ‘I2, passage 99 and groove 91, passage the piston 89 has moved suflicient to close the ex 99 and also through slot I3I, entrance I 33 and . haust port I22. > passage I35. Pressure builds up on the fuel charge in the There being two independent passages for the space mentioned and forces open the valve I I9 supply of air to they chamber I39 neither passage to expose the outer ends of .the passages H9 so need be large and the rapid supply of the required that the fuel charge moves through head 98 supply of air is assured. As the block 89 nears (valve 2i having now closed) and into the space 9 the end of the piston stroke its entrance I33 moves ‘between the piston 89 and the ?ring chamber o? the end of vslot I3I and no further supply of head 93 and within the skirt I99 and above the air is obtained from that source. In addition member I95 from which space through openings as the crank ‘12 turns its arcuate groovefill' is II2 the fuel moves into the space H3. At the moved out of register with the passage 99 closing end of the stroke the piston construction-has off the second source of supply of air to the shifted to the extreme left of the cylinder I9 and ' chamber I38 and sealing the latter. a charge is ready to be ?red at such end while During movement of the piston in the direc a charge has been drawn into the right hand end tion indicated a plentiful supply of air is there of the cylinder and is ready to be compressed and fore trapped in the chamber I38. Now when the (5." forced into the space “3a between the piston 8i piston head 8| moves past the exhaust port I23 and the firing chamber head 99. the pressure between said pistonhead and the At this time the crank ‘I2 is in the position ?ring head 99 drops. At such time the com reverse to that of- Fig. 2 and is in the position of When the charge is ignited in the space “3a pressed air in the space I31 and in the space Fig. 3, 7 That is, the cranks have moved from between the liner 92 and the skirt of the piston TI the right hand end to the left hand end of the head 8i acts on the portion I99 of the skirt of slots I59. Small valves I92 in thewalls of skirts the ?ring chamber head 99 and such skirt and I99 and IIII serve to prevent the creation of any head together with the memberi99 are moved inv vacuum in the chambers I37 and I 93 between the the direction of the piston or away from the cyl skirt HM and the skirt of piston 8| and the skirt inder head III. I99 and the skirt of piston 89. 2,410,477 ‘ 7 - . 16 does not impart movement to the piston con structlon, but results merely in rotation of such shafts, the discs 15, webs ‘l4 and cranks 12 it ‘will be clear that in any arrangement involving a plu rality of the engines in a line with their shafts 16 coupled any one or more of the engines may be stopped or may get out of order and stop without- imposing a large burden on the yet op As the engine continues to operate the above described cycle of operation is repeated. Movement of the piston construction in one direction com presses a charge and forces it into the ?ring chamber at one end of the cylinder while a charge is fired, the burned gases scavenged, and a new charge drawn into the cylinder at the other end thereof. The cranks 12 are moved back and ‘ crating- enginesof the bank. forth in the cylinder slots 69. Attention is called to the fact that when the 1o, Having ‘thus set forth the nature of my inven tion, what I claim is: piston heads are moved to close the exhaust ports 1. In a two cycle internal combustion engine, air is trapped between the piston heads and the a cylinder and piston construction, a crank means, ?ring chamber heads and this air is used asan ‘ addition to the charge drawn through the intake said crank means including a crank connected Thus, while in each instance a large charge is drawn- into the cylinder such charge is further increased in volume by the presence of the men thereby, a web connected at one end with said ‘crank, a power take-off shaft, a head on said, ports at the respective ends of the‘ cylinder.‘ 15 with said piston construction for reciprocation shaft, a pivot connecting said web with ‘said head, and said pivot eccentric to said crank and said During reciprocation of the piston construc-_ 20 shaft and equally spaced from each of them whereby said crank'is in alignment with said tion as described the cranks 12 are carried back power take-off shaft when said piston construc and forth in the slots 69 of the cylinder l0. These - tioned trapped air; tion is in a dead center position. A cranks are located in eccentric relation to the 2. In a two cycle internal combustion engine, heads or discs 15 and the shafts l6 and further the-‘pivots l‘! of the webs of the cranks are in 25 a cylinder, a double ended piston construction in said cylinder, a crank means including a crank eccentric relation to the discs and shafts. Thus connected with said piston construction for recip looking'at Fig. 7 the crank position is that of rocation thereby, a web connected at one end with said crank, a power take-off shaft, a head on and the piston construction moves toward the left 30 said shaft, a pivot connecting said web with said Fig. 2. ' As the cylinder construction remains stationary head, and said pivot eccentric with said crank and power take-off shaft and equally spaced from each of them whereby said crank is in alignment with said power take-off shaft when said piston the discs (Fig. 8) to the positions of Fig. 9. ' Then is in a dead-center position. on the reverse stroke of ‘the piston the webs and 35 construction 3. In a two'oycle internal combustion engine, pivots move downwardly while the cranks move a cylinder, a double ended piston construction in back through dead center as shown in Fig. 10 said cylinder, .a crank.means including a crank to the position of Fig. 11 which is the same as connected with said. piston construction for re that of Fig. 7 the chosen starting position. 40 ciprocation thereby, a web connected at one end When the engine is stopped as byv the closing of with said crank, a power take-off shaft, a head its fuel'supply and the opening of its ignition cir- ' on said shaft, a pivot connecting said web with cuit the piston construction comes toa dead cen said head, said pivot eccentric with said crank ‘ter position bringing the cranks 12 into alignment and power take-oil shaft and equally spaced from with the shafts 16 and concentric with them and them whereby said crank is in alignment with the discs ‘I5. This is due to the fact that the pins said power take-off shaft when said piston con from the position of Fig. 2 the pivot pins ‘ll’ of the crank webs move upwardly turning the discs ‘I5 and the cranks ‘move through the centers of ‘H are located the same distance from the centers of cranks ‘I2 as from the center of the shafts 16. Now if the pins 38 (Fig. 3) are in their upper. positions, on any attempt to start the engine by a cranking action applied to either or both shafts 50 18 the latter with the, discs 15 will merely spin around carrying the pins 11 but not moving the piston construction. To start the engine the pins 38 are depressed by actuation of the rocker 44 so that such pins are against the rollers 18 of the respective crank webs 14. _ Now as the engine is cranked .or a struction is in a dead-center position, and man ually controlled means for moving said piston construction out of dead-center position to dis align said crank and said power take-off shaft to enable cranking of the engine to be accom plished by turning of said shaft. 4. In an engine, a cylinder and piston con struction, a. crank connected with said piston con , struction for reciprocation thereby, a web con nected with said crank, a power take-off shaft, a head on said shaft, a pivot connecting said web with said head, and said pivot eccentric with said turning movement is applied to the shafts 16 the shaft and crank and equally spaced from each rollers 18 engaging the pins act through the crank of them whereby said crank is aligned with said webs and shift the cranks laterally moving them 60 shaft when said piston construction is in a dead out of dead center position and shifting the pis center position and said shaft may be rotated ton construction. From there on the cranking of without movement of the piston construction. the engine proceeds in the usual manner. Since when the engine is stopped turning of the‘ shafts ‘' DAVID BLUMBERG.