Reversible engine mount

Claim 2

In a two-cycle gasoline engine the combination comprising: a. a crankcase having an intake port for receiving a combustible mixture and a side wall portion terminating in a mounting flange and having a circular opening centered in said flange; b. a block having walls defining a cylinder with an exhaust port through its side, said block terminating in a mounting flange at its bottom; c. passages open to said cylinder, running axially in the wall of said block from said flange; d. positioning means, integral with said block, extending axially from said flange and around said cylinder between said passages; e. means for mounting said block upon said crankcase in alternative positions about the axis of said cylinder in each of which their flanges are juxtaposed and said positioning means extend into said crankcase opening; and f. second positioning means integral with said crankcase and extending inwardly from the walls of said opening toward said first positioning means, said second positioning means being spaced to register with said first positioning means and to clear said passages in all positions of said block so as to permit combustiblE gases to pass into said passages from said crankcase unobstructed by said second positioning means.

Claim 3

A combination in accordance with claim 1 and characterized further in that: a. there are two sets of passages in the wall of said block, said sets being spaced apart on opposite sides of said exhaust port; and b. said first positioning means is comprised of two symmetrical arcuate portions facing each other from between said sets of passages, both said portions being notched substantially at their centers to provide clearance for a crank rotating within said crankcase when the said block is in two of its alternative positions.

Claim 4

In a two-cycle gasoline engine the combination comprising: a. a crankcase having an intake port for receiving a combustible mixture and a circular opening surrounded by a flange; b. a cylinder block having walls defining a cylindrical chamber open at one end to admit a piston and having a flange surrounding said open end, said cylinder also having an exhaust port through its side and a plurality of circumferentially spaced apart grooves running axially along its side wall from said flange toward the opposite end of said cylinder, said grooves being recessed in said side wall to a common depth defined by a circle concentric with said cylinder and substantially of the same size as the circular opening in said crankcase flange; c. a pair of arcuate positioning lips extending from the open end of said cylinder between said grooves; d. means for mounting said cylinder block upon said crankcase in any of several alternative positions in each of which said mounting flanges are juxtaposed and said positioning lips extend into the opening in said crankcase flange; and e. a set of centering bosses extending radially inwardly from the walls of said crankcase opening toward said positioning lips, said bosses being so distributed that all of them register with said positioning lips and none of them extend opposite one of said grooves regardless of the alternative position in which said cylinder block is mounted upon said crankcase, whereby said combustible mixture can flow unobstructed from said crankcase and through said grooves to the said opposite end of said cylinder regardless of the particular position in which said cylinder block is mounted.

Claim 5

In a two-cycle gasoline engine the combination comprising: a. a crankcase having an intake port for receiving a combustible mixture and a circular opening surrounded by a flange; b. a cylinder block having walls defining a cylindrical chamber open at one end to admit a piston and having a flange surrounding said open end, said cylinder also having an exhaust port through its side and a plurality of circumferentially spaced apart grooves running axially along its side wall from said flange toward the opposite end of said cylinder, said grooves being recessed in said side wall to a common depth defined by a circle concentric with said cylinder and substantially of the same size as the circular opening in said crankcase flange; c. a pair of arcuate positioning lips extending from the open end of said cylinder between said grooves; d. means for mounting said cylinder block upon said crankcase in any of several alternative positions in each of which said mounting flanges are juxtaposed and said positioning lips extend into the opening in said crankcase flange; and e. a set of centering bosses extending radially inwardly from the walls of said crankcase opening toward said positioning lips, said bosses being so distributed that all of them register with said positioning lips and none of them extend opposite one of said grooves regardless of the alternative position in which said cylinder block is mounted upon said crankcase, whereby said combustible mixture can flow unobstructed from said crankcase and through said grooves to the said opposite end of said cylinder regardless of the particular position in which said cylinder block is mounted.

Claim 6

In a two-cycle gasoline engine the combination comprising: a. a crankcase having an opening and an intake port in its side; b. a carburetor mounted upon said crankcase at said intake port; c. a block having walls defining a cylinder with an exhaust port through its side; d. means for mounting said block upon said crankcase at said opening in alternative positions about the axis of said cylinder, thereby to permit different orientations of said exhaust port relative to said carburetor; e. a piston within the cylinder defining a combustion chamber with the end of the cylinder remote from the crankcase; f. means defining passages in the wall of said block open to said cylinder and open to the interior of the crankcase for permitting the combustible mixture to flow into the combustion chamber; and g. means on said block and said crankcase for laterally positioning the cylinder with respect to said crankcase opening, said positioning means being arranged to clear the passages in all positions of the block so as to permit the combustible mixture to pass through the passages from the crankcase unobstructed by the positioning means.

Claim 7

In a two-cycle gasoline engine the combination comprising: a. a crankcase having an opening and an intake port in its side; b. a carburetor mounted upon said crankcase at said intake port; c. a block having walls defining a cylinder with an exhaust port through its side; d. means for mounting said block upon said crankcase at said opening in alternative positions about the axis of said cylinder, thereby to permit different orientations of said exhaust port relative to said carburetor; e. a piston within the cylinder defining a combustion chamber with the end of the cylinder remote from the crankcase; f. means defining passages in the wall of said block open to said cylinder and open to the interior of the crankcase for permitting the combustible mixture to flow into the combustion chamber; and g. means on said block and said crankcase for laterally positioning the cylinder with respect to said crankcase opening, said positioning means being arranged to clear the passages in all positions of the block so as to permit the combustible mixture to pass through the passages from the crankcase unobstructed by the positioning means.