BICYCLE FRAME Russian patent published in 2015 - IPC B62K3/02 B62K19/30 

FIELD: transport.

SUBSTANCE: bicycle frame includes carriage bushing with which lower front tube connected with steering tube and lower rear wing connected with brackets of rear wheel bushing mounting are connected. The lower front tube and the lower rear wing are oriented in opposite directions. Under-saddle tube is located at an angle towards brackets of rear wheel bushing mounting, and to the under-saddle tube in its top part the upper front tube connected with steering tube and upper rear wing connected with the mentioned brackets are attached. The upper front tube and the upper rear wing are oriented in opposite directions. The under-saddle tube is made bended and consisting of two sections the first one of which is made straight and its longitudinal axis is located on line crossing lower rear wing in the section between the carriage bushing and brackets of rear wheel bushing mounting at an angle of 64° to 71°, and the second section is located at obtuse angle to the first one and its longitudinal axis is located on line crossing carriage bushing. The angle between longitudinal axis of lower front tube in the section of its connection with carriage bushing and longitudinal axis of the second section of the under-saddle tube is selected in the range of 119° to 125°.

EFFECT: ease of bicycle use and improved rigidity.

3 dwg