If you want to install your own bike rack at your own expense, you need a permit (no fee required!). All instructions for obtaining a permit from the Streets Department are here. This fact sheet provides names of bike rack manufacturers.
The fabulous bike corral installed on Sydenham Street between 15th and 16th (off Walnut).
The car-shaped bike corral on Sydenham can securely hold 14 bikes and features a built-in tire pump. It was installed as part of Park(ing) Day in September 2011 through a partnership with the Mayor's Office of Transportation and Utilities (MOTU), Streets Department, and the Philadelphia Parking Authority. Thanks to their continuing support and those made donations, it will remain in its current location permanently.