Patent Publication Number: US-4482131-A

Title: Nail extractor

Description:
BACKGROUND OF THE INVENTION 
     Because of the rising cost of labor the paradoxical situation had been reached where it was often not economically feasible to spend the time to remove nails from previously used boards in construction projects. That is, the conventional means for removing nails, such as with a claw hammer, had a greater labor time cost than simply buying new boards. Thus, apparent waste was resulting from disposal of usable boards having nails. 
     SUMMARY 
     The nail remover, which is the subject of this invention, solves the problem previously discussed, of time-cost waste of boards not used because they have nails in them which need to be removed. It does this by a unique structure and operation providing advantages in function and economical operation not thought possible previously. 
     Thus, this invention includes a head having a recessed groove to engage the shank of a nail embedded in a board. This recessed groove is formed in a lifting head connected to a hollow structure adapted to receive a hammer-like device which can smash against this lifting head thereby causing it to engage a nail which is to be removed. 
     Connected to the hammer is a rod engageable with a rotating mechanism which is adapted to turn the rod and connected hammer-like device so as to cause an engaged nail to be quickly and easily lifted from a board. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is an isometric view of a preferred form of this invention showing a cylindrical head with nail-engaging groove attached to a rod. 
     FIG. 2 is a view of the nail extracting device longitudinally sectioned through 2--2 in FIG. 1. 
     FIG. 3 is a fragmented, isometric top view of the nail extracting head showing the nail-engaging groove. 
     FIG. 4 is a bottom plan view of a fragmented portion of the nail-extracting head taken in section through 4--4 in FIG. 3. 
     FIG. 5 is a partially fragmented side view of the extractor head engaging a nail embedded in a board as in normal use. 
     FIG. 6 is a cross-sectional view taken through 6--6 in FIG. 5 showing an engaged nail being extracted as a rotating means (not shown) turns the rod and connected extracting head. 
    
    
     DETAILED DESCRIPTION OF A PREFERRED EMBODIMENT OF THE INVENTION 
     A nail extractor in accordance with this invention includes a nail extractor head 10 connected to a driving rod 12 which is slidably mounted within holding section 14. As shown best in FIG. 2 the holding section 14 is formed as a hollow cylinder slidably mounted over driving rod 12. The portion of rod 12 within holding section 14 is matingly shaped for sliding movement therein. 
     The rod 12 is provided with a circular cross-sectional configuration and enters holding section 14 through matingly shaped circular holes 16 and 18 in the opposite ends thereof. 
     The nail extractor head 10 turns as its connected rod 12 is turned. Thus, the end of rod 12 opposite from head 10 is provided with ratchet-socket attaching means 20 which is preferably connected to a powered electric or air impact wrench (not shown) for turning. 
     The outside of holding section 14 is provided with molded, finger-tip recesses 22, 24 and 26 on one side. A half-disc shaped shield 28 having a forwardly projecting overhanging lip 30 is connected to the holding section 14 end nearest to head 10. 
     The nail extractor head 10 is formed with a forwardly opening groove 36 formed with inwardly contacting beveled engaging walls 38 and 40 spaced sufficiently far apart to allow entry between them of the upper shank portion of a nail. In order to lift the nail the inward end of groove 36 is small enough to engage the head of the nail. 
     A viewing slot 32 is cut through the side of head 10 opposite from groove 36 to help align it with a nail to be lifted. The groove 36 is preferably formed with beveled edges to prevent cutting and thereby breaking nails being lifted. 
     The head 10 is separable from the driving rod 12, but rigidly connectable by attaching means such as through insertion of pin 42 into mating alignable hole 44 in head 10 and hole 46 in rod 12. Thus, different sizes and shapes of heads can be connected to the same hammering section. 
     As shown, the head 10 is preferably circular in cross-section and formed with a flat bottom surrounding the groove 36 therein which is formed by inwardly slanting engaging walls 38 and 40. 
     In operation, a powered turning impact wrench (not shown) is engaged with ratchet socket attaching means 20 on the end of rod 14. Then the groove 36 of head 10 engages the upper shank 50 under the head 52 of a nail that is to be removed from a board 54 as shown in FIG. 5. The shank 50 of the nail being removed becomes quickly lodged in the groove 36 of head 10 as it is pushed by rod 12 sliding within holding section 14. 
     When the nail head 52 is fully engaged within the groove 36, as shown in FIG. 5, it is lifted from board 54. Then the impact wrench (now shown) is momentarily turned on thereby causing a short turn which rolls the connected nail extractor to the side and lifts the engaged nail from the board as shown in FIG. 6. 
     The device is intended primarily for use with the duplex type nail shown. Also, in addition to the beveled edges on the groove walls 38 and 40, the radius of the circular portion of the head 10 is sufficiently large that it bends the nails as it lifts them, without breaking them. This is best shown in FIG. 6. 
     Though a preferred embodiment of this invention has been shown and described herein this is not meant as a limitation of this invention but exemplicative only as an illustration of how it might be used and made wherein the scope of forms intended to be covered are defined by the spirit of the following claims.