Control handle of photography support stand and photography support stand

A control handle of a photography support stand, the control handle being configured to unlock or lock a support leg locking assembly of the photography support stand, wherein the control handle comprises:

• a handle housing;
• and
• a hydraulic cylinder arranged in the handle housing, the hydraulic cylinder comprising a cylinder body and a first piston, the cylinder body being defined with a hydraulic chamber for storing hydraulic fluid and a through hole that is communicated with the hydraulic chamber and configured to allow the hydraulic fluid to enter or exit the hydraulic chamber, the through hole being communicated with the support leg locking assembly, and the first piston being slidably arranged in the hydraulic chamber and configured to expel the hydraulic fluid in the hydraulic chamber through the through hole or draw the hydraulic fluid back into the hydraulic chamber through the through hole;
• wherein, the first piston is defined with a pressure relief chamber for accommodating the hydraulic fluid and a pressure relief hole communicating the pressure relief chamber with the hydraulic chamber and configured to allow the hydraulic fluid to pass through;
• a first reset component and a slidable second piston are provided in the pressure relief chamber, and the first reset component is configured to apply a force to the second piston to reset the second piston.

A photography support stand, comprising:

• a bearing base, configured for mounting a photography device;
• multiple support legs with a telescopic adjustment function, the multiple support legs being connected with the bearing base and configured to support the bearing base, and each support leg being provided with a support leg locking assembly;
• and
• a control handle, the control handle being arranged on the bearing base and configured to unlock or lock the support leg locking assemblies;
• wherein,
• the control handle comprises:
• a handle housing;
• and
• a hydraulic cylinder arranged in the handle housing, the hydraulic cylinder comprising a cylinder body and a first piston, the cylinder body being defined with a hydraulic chamber for storing hydraulic fluid and a through hole that is communicated with the hydraulic chamber and configured to allow the hydraulic fluid to enter or exit the hydraulic chamber, the through hole being communicated with the support leg locking assembly, and the first piston being slidably arranged in the hydraulic chamber and configured to expel the hydraulic fluid in the hydraulic chamber through the through hole or draw the hydraulic fluid back into the hydraulic chamber through the through hole;
• or
• the control handle comprises:
• a handle housing;
• and
• a hydraulic cylinder arranged in the handle housing, the hydraulic cylinder comprising a cylinder body and a first piston, the cylinder body being defined with a hydraulic chamber for storing hydraulic fluid and a through hole that is communicated with the hydraulic chamber and configured to allow the hydraulic fluid to enter or exit the hydraulic chamber, the through hole being communicated with the support leg locking assembly, and the first piston being slidably arranged in the hydraulic chamber and configured to expel the hydraulic fluid in the hydraulic chamber through the through hole or draw the hydraulic fluid back into the hydraulic chamber through the through hole;
• wherein, the first piston is defined with a pressure relief chamber for accommodating the hydraulic fluid and a pressure relief hole communicating the pressure relief chamber with the hydraulic chamber and configured to allow the hydraulic fluid to pass through;
• a first reset component and a slidable second piston are provided in the pressure relief chamber, and the first reset component is configured to apply a force to the second piston to reset the second piston.