Patent ID: 7444723

Claim:
A safety hook comprising: a hook body defining a hook inner space therein and a hook mouth in spatial communication with said hook inner space; a latch unit including a latch plate that is pivoted to said hook body so as to be rotatable relative to said hook body between locked and unlocked positions, said latch plate having a blocking plate portion that blocks said hook mouth when said latch unit is disposed at the locked position, thereby denying access into said hook inner space; a releasing unit including a releasing plate that is pivoted to said hook body so as to be rotatable relative to said hook body, said releasing plate having a driving plate portion opposite to said blocking plate portion of said latch plate; and a safety lock unit including a bent safety plate that is disposed between said latch plate and said releasing plate and that is pivoted to said hook body so as to be rotatable relative to said hook body between restraining and releasing positions, said bent safety plate having a pivoting middle portion pivoted to said hook body, a restraining end portion extending from one end of said pivoting middle portion to abut against said blocking plate portion of said latch plate, and a driven end portion extending from the other end of said pivoting middle portion to abut against said driving plate portion of said releasing plate so as to permit said bent safety plate to be driven by said releasing plate to rotate from the restraining position to the releasing position, said restraining end portion of said bent safety plate being perpendicular to said blocking plate portion of said latch plate when said bent safety plate is disposed at the restraining position, thereby preventing rotation of said latch plate from the locked position to the unlocked position, said restraining end portion of said bent safety plate being inclined to said blocking plate portion of said latch plate at an angle less than 90 degrees when said bent safety plate is disposed at the releasing position, thereby permitting rotation of said latch plate from the locked position to the unlocked position; wherein said restraining end portion of said bent safety plate and said driven end portion of said bent safety plate form an angle less than 180 degrees and greater than 90 degrees.