Abstract: A heavy duty stapler comprises a base member; a magazine member, which has a first end pivotally connected to the base member and a second end opposite to the first end, including a firing device provided at the second end thereof, with a firing portion formed from an end of the firing device; a lever arm, which has first and second end, including first and second pivotal sections defined at the first end thereof and a pressing section defined at the second end thereof opposite to the first and second pivotal sections, with the first pivotal section pivotally connected to the base member; a linkage member having a first end pivotally connected to the second pivotal section of the lever arm and a second end opposite to the first end thereof; and a driven member including a first pivotal portion pivotally connected to the base member, a second pivotal portion pivotally connected to the second end of the linkage member and a driven portion.

Abstract: An effort-saving stapler includes a first activating mechanism including a first connecting section and an abutting ridge, and a second activating mechanism including a ram and an arm including a second connecting section pivotally connecting to the first connecting section at a fulcrum point “A”. The stapler further includes a pushing mechanism including a third connecting section, an anvil, and an abutting ridge contacting with the abutting edge of the first activating mechanism, and with these two abutting ridges defining a contact point “B”. The stapler further includes a magazine including a fourth connecting section pivotally connected to the third connecting section at a second fulcrum point “C”. The fulcrum point “A”, contact point “B” and fulcrum point “C” are in a straight line when bending legs of the staples for closing the staples in an effort-saving way.

Abstract: An effort-saving stapler includes a first activating mechanism including a first connecting section and an abutting ridge, and a second activating mechanism including a ram and an arm including a second connecting section pivotally connecting to the first connecting section at a fulcrum point “A”. The stapler further includes a pushing mechanism including a third connecting section, an anvil, and an abutting ridge contacting with the abutting edge of the first activating mechanism, and with these two abutting ridges defining a contact point “B”. The stapler further includes a magazine including a fourth connecting section pivotally connected to the third connecting section at a second fulcrum point “C”. The fulcrum point “A”, contact point “B” and fulcrum point “C” are in a straight line when bending legs of the staples for closing the staples in an effort-saving way.

Abstract: A heavy duty stapler comprises a base member; a magazine member, which has a first end pivotally connected to the base member and a second end opposite to the first end, including a firing device provided at the second end thereof, with a firing portion formed from an end of the firing device; a lever arm, which has first and second end, including first and second pivotal sections defined at the first end thereof and a pressing section defined at the second end thereof opposite to the first and second pivotal sections, with the first pivotal section pivotally connected to the base member; a linkage member having a first end pivotally connected to the second pivotal section of the lever arm and a second end opposite to the first end thereof; and a driven member including a first pivotal portion pivotally connected to the base member, a second pivotal portion pivotally connected to the second end of the linkage member and a driven portion.

Abstract: An effort-saving stapler comprises a base member defining a coupled member; a magazine assembly having a first end pivotally connected to the coupled member and a second end; a linkage assembly which has a first end and a second end including a pair of first slide grooves defined at the first end thereof, a pair of channels defined at the second end thereof, a pair of second slide grooves defined between the first and second ends thereof and a firing member slideably coupled to the channel and being able to drive the second end of the magazine assembly; a lever arm which has a first end slideably coupled to the first slide grooves of the linkage assembly and a second end including a pair of third slide grooves between the first and second ends thereof, with the second and third slide grooves slideably joined together and selectively engaged with the coupled member of the base assembly, and with the lever arm pivotally coupled to the coupled member between the first end of the lever arm and the third slide gro