An effort-saving binder clip

An effort-saving binder clip, comprising clamping parts, a rear part, and rod members. Two clamping parts are arranged, the rear part is arranged at one end of the clamping parts and connects the two clamping parts which form an openable opening at the other end. A pivotal part is arranged at the other end of each clamping part. Two rod members are arranged and correspond to the clamping parts. The two clamping parts are marked as the first clamping part, the second clamping part, and the two rod members are marked as the first rod member, the second rod member, respectively. When the binder clip is used, one end of the first rod member and one end of the second rod member both exceed in length the rear part for the convenience of users to press the exceeding parts against each other. The other end of the first rod member is pivotally connected with the pivotal part of the first clamping part, and the other end of the second rod member is pivotally connected with the pivotal part of the second clamping part, wherein holes are both arranged between the first clamping part and the rear part and between the second clamping part and the rear part. The hole between the first clamping part and the rear part is marked as a first hole, and the hole between the second clamping part and the rear part is marked as a second hole. Part A of the first hole is arranged in the first clamping part, and Part B is arranged in the rear part. In addition, Part A extends toward the opening side. The length of Part A from the rear part to the opening side is given in a closed interval [1/10H, 1/2H], where H is the length of the first clamping part from the rear part to the opening side;

• Part C of the second hole is arranged in the second clamping part, and Part D is arranged in the rear part. In addition, Part C extends toward the opening side. The length of Part C from the rear part to the opening side is given in a closed interval [1/10L, 1/2L], where L is the length of the second clamping part from the rear part to the opening side. When the binder clip is used, the first rod member passes through the first hole and contacts one end of the first clamping part against the opening side of the Part A, forming a first fulcrum. From the first fulcrum to the pivotal part, a gap exists between the first rod member and the first clamping part;
• when the binder clip is used, the second rod member passes through the second hole and contacts one end of the second clamping part at the opening side of Part C, forming a second fulcrum. From the second fulcrum to the pivotal part, a gap exists between the second rod member and the second clamping part.
• When the first rod member is pressed, Part B provides space for pressing the first rod member. When the second rod member is pressed, Part D provides space for pressing the second rod member.