Gas-free light bulb device

A gas-free light bulb device comprising:

• a lamp head;
• a heatsink mounted on the lamp head and having
• a mounting slot defined in the heatsink;
• and
• a driver circuit board mounted in the mounting slot;
• a bulb mounted on the heatsink and having a cavity defined in the bulb;
• a glass core column mounted in the mounting slot of the heatsink and extending in the cavity of the bulb;
• multiple filament assemblies suspended on the glass core column and indirectly electrically connected to the driver circuit board;
• and
• a resilient extending element mounted on the glass core column and having
• a resilient rubber sleeve mounted around the glass core column, wherein a thermal expansion coefficient of the resilient rubber sleeve is higher than a thermal expansion coefficient of the glass core column;
• and
• multiple resilient extending rubber bars formed on and protruding radially outward from the resilient rubber sleeve and corresponding to the multiple filament assemblies, and an outer end of each resilient extending rubber bar connected to a corresponding filament assembly;
• wherein, when the gas-free light bulb device is not operated under room temperature, an inner diameter of the resilient rubber sleeve is not larger than an outer diameter of the glass core column such that the resilient rubber sleeve is mounted tightly on a lower position of the glass core column and is unable to slide, at the meantime, the resilient extending rubber bars are curved and apply resilient force to the filament assemblies and the resilient rubber sleeve.

A gas-free light bulb device comprising:

• a lamp head;
• a heatsink mounted on the lamp head and having
• a mounting slot defined in the heatsink;
• and
• a driver circuit board mounted in the mounting slot;
• a bulb mounted on the heatsink and having a cavity defined in the bulb;
• a glass core column mounted in the mounting slot of the heatsink and extending in the cavity of the bulb;
• multiple filament assemblies suspended on the glass core column and indirectly electrically connected to the driver circuit board;
• and
• a resilient extending element mounted on the glass core column and having
• a resilient rubber sleeve mounted around the glass core column, wherein a thermal expansion coefficient of the resilient rubber sleeve is higher than a thermal expansion coefficient of the glass core column;
• and
• multiple resilient extending rubber bars formed on and protruding radially outward from the resilient rubber sleeve and corresponding to the multiple filament assemblies, and an outer end of each resilient extending rubber bar connected to a corresponding filament assembly;
• wherein, when the gas-free light bulb device is operated with rising temperature, the resilient rubber sleeve is heated and expanded to make an inner diameter of the resilient rubber sleeve larger than an outer diameter of the glass core column, at the meantime, the resilient rubber sleeve is loosened relative to the glass core column, and resilient force of the resilient extending rubber bar drives the resilient rubber sleeve to slide upward along the glass core column to an upper position of the glass core column and to pivot the multiple filament assemblies upward relative to the glass core column until the bottom end of each filament assembly contacts the bulb an inner wall of the cavity and conducts heat of each filament assembly to the bulb.