Drive frame for a self-propelled elevator car

A drive frame for a self-propelled elevator car travelling on guide rail running surfaces (22), the drive frame including a car body supporting frame (16,17,18) with driving wheels (1) and supporting wheels (2), comprising:

• a pair of frame brackets (5) adapted to be attached to a lower end of car body supporting frame (16,17,18);
• a frame crossbeam (14) connected at opposite ends thereof to said frame brackets (5);
• a pair of rocker arms (15) each pivotally mounted at one end to an associated one of said frame brackets (5);
• a drive unit (24);
• a pair of axle tubes (3) each having an inner end connected to one end of said drive unit (24) and an outer end attached to an opposite end of an associated one of said rocker arms (15) for rotatably mounting a pair of driving wheels (1) said outer ends;
• an axle carrier (4) on each of said frame brackets (5);
• a supporting wheel axle (12) mounted at opposite ends thereof to said axle carriers (4) for rotatably mounting a pair of supporting wheels (2) on said opposite ends;
• and
• a pair of spring cylinders (8) each being connected between said supporting wheel axle (12) and one of said axle tubes (3) for drawing said axle tubes (3) and said supporting wheel axle (12) towards one another.

A drive frame for a self-propelled elevator car travelling on guide rail running surfaces (22) comprising:

• a pair of generally vertically extending side beams (16);
• a yoke beam (18) connected between upper ends of said side beams (16) by a pair of gusset plates (17);
• a pair of frame brackets (5) each attached to a lower end of an associated one of said side beams (16), each said frame bracket (5) having a support surface (21) formed thereon for supporting an elevator car body;
• a frame crossbeam (14) connected at opposite ends thereof to said frame brackets (5) and having lateral passages (13) formed in said opposite ends;
• a pair of rocker arms (15) each pivotally mounted at one end to an associated one of said frame brackets (5);
• a drive unit (24);
• a pair of axle tubes (3) each having an inner end connected to one end of said drive unit (24) and an outer end attached to an opposite end of an associated one of said rocker arms (15);
• a pair of driving wheels (1) each rotatably mounted on said outer end of one of said axle tubes (3);
• an axle carrier (4) on each of said frame brackets (5);
• a supporting wheel axle (12) mounted at opposite ends thereof to said axle carriers (4) and having a pair of supporting wheels (2) rotatably mounted on said opposite ends;
• and
• a pair of spring cylinders (8) each extending through one of said lateral passages (13) and being connected between said supporting wheel axle (12) and one of said axle tubes (3) for drawing said driving wheels (1) and said supporting wheels (2) towards one another for contacting guide rail running surfaces (22).