Patent ID: 7374191

Claim:
A frame for a bicycle having a front frame having a front; a rear; a head tube being formed at the front of the front frame; a down tube being connected to and protruded at an angle down from the head tube toward the rear end of the front frame and having a bottom end; a top tube being connected to and protruding from the head tube toward the rear end of the front frame and having a rear end; a bottom bracket shell being connected transversally to the bottom end of the down tube and having a top; and a seat tube being connected to and protruded up from the top of the bottom bracket shell, being connected to the rear end of the top tube and having an external surface; an upper end; a lower end; a jacket being formed on and protruded down from the external surface of the seat tube near the upper end opposite to the top tube and having a mounting end being formed on the external surface of the seat tube; a connecting end; an opening being defined in the connecting end of the seat tube opposite to the mounting end; and a chamber being defined in the jacket and being communicated with the opening; and a threaded hole being formed axially through the mounting end of the jacket and being communicated with the chamber; a rear frame being connected pivotally to the front frame and having a lower fork being connected pivotally to the bottom bracket shell below the seat tube and having a front end being connected to the bottom bracket shell; and two rear ends being formed with the front ends and parallel to each other; two dropouts being respectively mounted to the rear ends of the lower fork; and an upper fork being connected to the dropouts; and a shock absorber being mounted between the seat tube of the front frame and the upper fork of the rear frame and having an elastomer being extended into the chamber of the jacket and having a center; and a central hole being formed axially through the center of the elastomer and being communicated with the threaded hole; a connecting pipe being mounted around the elastomer and having an open end extending into a sleeve and the chamber in the jacket and being mounted around the elastomer; a mounting end being connected securely to the upper fork; and a connecting hole being formed through the mounting end of the connecting pipe and being aligned with the central hole of the elastomer; and a shaft extending through the connecting hole of the connecting pipe and the central hole of the elastomer and being screwed into the threaded hole of the seat tube.