Staple gun

In a staple gun of the type that has a body that includes a staple chamber that holds staples in a row to be fed below a hammer contained in the body and an actuator that operates the hammer to drive a staple presented in the chamber below the hammer, the improvement wherein the staple gun is capable of driving at least two differently sized staples wherein one cable guideway is used in the staple gun for one of the staple sizes and a different cable guideway is used in the staple gun for the other staple size, wherein one of the guideways is provided at one end of a cable guide member and the other guideway is provided at an opposite end of the same cable guide member.

In a staple gun of the type that includes a handle, a pivotable lever, a hammer, a fulcrum member, a staple chamber that holds staples in a row to be fed below the hammer to drive a staple presented below the hammer, leaf springs extending from one end of the staple gun to near the hammer, wherein the fulcrum member contacts the leaf springs at an area of contact that defines a fulcrum for the leaf springs, the improvement wherein the fulcrum member is configured such that the fulcrum moves toward the hammer along a path as the lever and handle are moved towards each other at a rate faster than if the fulcrum path was defined by a fixed radius fulcrum member.

In a staple gun of the type that includes a handle, a pivotable lever, a hammer, a fulcrum member, a staple chamber that holds staples in a row to be fed below the hammer to drive a staple presented below the hammer, leaf springs extending from one end of the staple gun to near the hammer, wherein the fulcrum member contacts the leaf springs at an area of contact that defines a fulcrum for the leaf springs, the improvement wherein the fulcrum member includes a plurality of ridges such that as the lever and the handle are moved toward each other, each ridge sequentially contacts the leaf springs at a corresponding distinct fulcrum which is closer to the hammer than a previous fulcrum.

In a staple gun of the type that includes a spring-biased feed head for advancing staples forwardly from a chamber into a channel to be individually driven by a hammer, the improvement wherein the feed head includes a lower pushing surface contacting a body portion of the last staple in the chamber to move the staples forwardly and an upper surface for limiting the amount of tilt of the staple in the channel to prevent the stapler from jamming.