Locking device and system for truck cover

A pickup truck compartment cover, comprising:

• a fixing frame and a soft cover;
• a locking structure comprising two fixing side frames and a locking frame, wherein:
• a locking slot is disposed on an inner side wall of the fixing side frame,
• the locking frame is movably mounted at end portions of the two fixing side frames, locking cartridge assemblies corresponding to the fixing side frames are respectively disposed at both ends of the locking frame, and the locking frame is further provided, between the locking cartridge assemblies, with a sliding cartridge assembly controlling the locking cartridge assemblies to synchronously open,
• the locking cartridge assembly comprises a locking cartridge, a locking member, and at least one locking spring, wherein the locking member is slidably mounted in the locking cartridge along a longitudinal direction of the locking frame, the locking member comprises a lock tongue inserted into the locking slot, one end of the at least one locking spring abuts against the locking cartridge, and the other end abuts against the locking member,
• the sliding cartridge assembly comprises a control cartridge, a sliding handle, and an inhaul cable member, wherein the sliding handle is slidably mounted in the control cartridge along a direction perpendicular to the longitudinal direction of the locking frame, two ends of the inhaul cable member are respectively connected to the locking members of the locking cartridge assemblies, and the inhaul cable member abuts against the sliding handle,
• when the locking frame is mounted at the end portions of the two fixing side frames, the at least one locking spring is configured to push the lock tongue to be clamped into the locking slot, and the sliding handle is configured to drive the inhaul cable member to make the lock tongue break away from the locking slot,
• the fixing frame and the fixing side frames are all mounted in a compartment of a pickup truck, one end of the soft cover is mounted on the fixing frame and another end of the soft cover is mounted on the locking frame, and two sides of the soft cover respectively detachably match the fixing side frames,
• the control cartridge comprises a bottom cartridge and a cartridge cover,
• the control cartridge comprises a control sliding slot for a control handle to slide, the control sliding slot is disposed on a bottom surface of the bottom cartridge,
• the inhaul cable member runs through a left side surface and a right side surface of the control cartridge and abuts against a side on which the control handle faces the locking frame,
• the control handle comprises a handheld slot on a side against from the control sliding slot, and
• the cartridge cover comprises a handle opening corresponding to the handheld slot.