Title: Crankcase chamber compression type two cycle internal combustion engines

Abstract: In the engine the side wall of the piston is provided with a perforation at a portion not facing an exhaust port of the cylinder for communicating the cylinder wall with the crankcase chamber.

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Inventors: Shingai, Yoshisuke (Hamamatsu, JP)

Application Number: 920643
Filing Date: 1978-06-30
Publication_date: 1980-04-01
Assignee: Yamaha Hatsudoki Kabushiki Kaisha (Iwata, JP)
Primary Class(es): 123/43AA 92/160, 123/73A, 123/73PP, 123/196CP, 184/6.8
Other Classes:
US Patent Ref:

1172472	Feb, 1916	McCornack	123/73.
1537616	May, 1925	Mellen	123/73.
1852986	Apr, 1932	Tartrais	123/73.
1883637	Oct, 1932	Edwards	92/160.
1998392	Apr, 1935	Skarlund	123/196.
2147956	Feb, 1939	Alexandrescu	92/237.
2352592	Jul, 1944	Alexandrescu	92/160.
2416429	Feb, 1947	Boucher	184/6.
2669980	Feb, 1954	Yarrington	123/73.
2983334	May, 1961	Dalrymple	123/196.
3257997	Jun, 1966	Sheaffer	123/73.
3800753	Apr, 1974	Sullivan et al.	123/73.
3805751	Apr, 1974	Resnick et al.	123/196.
3973532	Aug, 1976	Litz	184/6.

Other Refs: 51850910143871081882214687

Nov, 1955	CA
Aug, 1957	DE
May, 1953	FR
Oct, 1939	CH

Primary Examiner: Cline, William R.
Assistant Examiner: Spiegel, H. Jay
Attorney: Pfund; Charles E.