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Description Dec. 13, 1949 ANDERSON 2,491,295 PEENING HAMMER HAVING REMOVABLE STRIKING HEAD Filed Nov. 5. 1945 INVENTOR. Patented Dec. 13, 1949 UNITED" STATES PATENT OFFICE This invention relates to improvements in a peen for a hammer head and has special reference to a device applicable to a hand hammer; used in the art of repairing automobile renders or the likelin' restoring the normal appea'rance' or the surface of a previously dented, bent or otherwise damaged fender, or body of an automobile. It is well known that whensuch force is applied either hymns or otherwise to deranged th n. me a s e s. c -.a$..au bi n c it becomes very hard to bring the surface of the metal back to normalcy without leaving an impression thereupon of the face of the tool employed. V In other words, it is very'ha'rd in many 1nstance's' to judge correctly thec'ontour of the surface being engaged by the face'of the hammer to avoid such defacement; and to overcome this problem is the principal object of the present invention. Another object is to so shape the co-operative parts of the peen of such a hammer that they will most readily function to hold the jointed parts thereof in close ideal working position at all times as well as more readily assume normal axial relation of the face of the peen to the head of the hammer. Other objects and advantages will appear during the further description of the embodiment here illustrated. Referring now to the accompanying drawing forming part of this application: Fig. 1 is a side elevational view of one type of hand hammer head with one of the improved peens shown in vertical section upon one terminus of said head, and Fig. 2 is a transverse sectional view on the line 2-2 Fig. 1. In the drawing, l represents the head of the hammer comprising the two opposed axially aligned shank- like portions 2 and 3. The shank 3 adjacent its extreme end is preferably reduced in diameter somewhat as at 4 and the extreme end is enlarged and of semispherical shape as at 5 with its greatest diametrical dimension somewhat more than that of the reduced adjacent shank portion 4 to provide the flat stepped ledge or annulus 5 as a seat for the smaller end of the conical expansive spring I. Now the peen proper comprises the cylindrical hollow body portion 8 with the spring chamber 9 therein and the circular head portion l [l preferably somewhat larger in diameter than the body portion and terminating in the slightly convexed 2- face II. The head It has formed therein a central semi-spherical seat for rockable reception of thesemi spherical terminus 5 of the hammer head. This seat is' of somewhat less depth than the't'erminus 5 in order to insure a free stepped seat'abdut the shank portion 4 for the spring l than the terminal member 5 so as to allow free passage th'erethroligh of the latter, thus there is formed the'circu'lai' ied elsebove the entrance to the chamber and therein for'suitable impingement for the larger extremity of the spring 1 in its constant action of keeping the een in ideal working contact with the shank of the hammer head. The spring I is of a size and strength to be readilyslipped over the enlarged terminus 5 of the hammer head shank, then contracted sufficiently and tucked into the chamber 9 through the entrance I 2 until it readily assumes its proper functioning position as shown. As convenience in removal of the spring I when occasion arises for such, there is provided the cut or slot I3 which extends diametrically across the open end of the peen and through the spring ledge I5 most clearly seen in Fig. 2 of the drawing and through either extremity of which the largest upper coil of the spring is accessible as by a small pointed instrument such as a small file shank or the like for compressing the spring and working it upwardly out of the chamber 9 simultaneously with the terminal 5 of the hammer shank. The inner end M of each terminal portion of the slot I3 is slightly flared to obviate the possibility of same being restricted by repeated engagement with the shank portion 4 during the hammering process material in actual practice. From the foregoing it is apparent that the paramount feature is that of keeping the workengaging portion of the peen in constant frictional, but yieldable rockable engagement with the shank portion of the hammer head during the hammering process and which provision has proved material in actual practice. Another notable feature in this type of peen when in actual use is the fact that at every retraction of the hammer head from a blow which had made the peen function at all out of its normal axial alignment, it would immediately reassume such a normal alignment for a subsequent blow. which obviously is essential to the success of the tool. Applicant has determined that the spring being of conical shape has a much greater tendency to maintain the peen in its proper normal axial alinement with the hammer shank, than a plain coil spring. What I claim is: 1. A new article of manufacture: a hammer head including a cylindrical shank portion, a portion of said shank adjacent one end thereof being of reduced diameter, the end surface of said end of the shank being semi-spherical and of a diameter greater than said portion of reduced diameter to provide an annular spring seat at the juncture of said semi-spherical portion with said portion of reduced diameter, a hollow one piece peen on said end portion and having a substantially semi-spherical recess formed in the inside surface of one end of said peen to rockably receive said semi-spherical end of the shank, the outside surface of said end of the peen forming a slightly curved peening surface, the opposite end of said peen having an opening forming an entrance portion to the chamber of said peen, said opening being substantially in axial alinement with said recess and of reduced size to the transverse dimension of said chamber but of a size to freely admit the end of said shank whereby a spring engaging seat is provided about said entrance, a conical expansive spring within said chamber and about said shank and with its smaller terminus impinging said spring seat on said shank and the opposite terminus impinging said spring seat on the peen to bias said peen and hammer head towards each other, and a diametrically disposed slot through the open end of said peen for convenience in removing said spring. 2. A hammer head including a cylindrical shank portion formed integral therewith, a portion of said shank adjacent one end thereof being of reduced diameter, the end surface of said end of the shank being semi-spherical and of greater diameter than said portion of reduced diameter providing an annular spring seat at the juncture of said semi-spherical portion with said portion of reduced diameter, a one-piece hollow peen on said end portion and having a semi-spherically shaped recess formed in the inside surface of one end of said peen to rockably receive said semispherical end of the shank, the opposite end of said peen having an opening forming an entrance to the chamber of said peen, said opening being substantially in alinement with said recess and of reduced size to the transverse dimension of said chamber but of a size to freely admit the end of said shank so that a spring seat is formed about said entrance, a conical expansive spring about said shank within said peen and having its smaller end engaging said spring seat on said shank and its larger end engaging said spring seat about said entrance on said peen to bias said peen and shank in engagement and normally in axial alinement, and a transverse diametrical slot through said opposite end of said peen for more convenient access to said spring to remove same from Within said hollow peen when required. NORMAN ANDERSON. REFERENCES CITED The following references are of record in the file of this patent: UNITED STATES PATENTS Number Name Date 217,546 Murdock July 15, 1879 1,104,564 Snyder July 21, 1914 1,284,446 Potts Nov. 12, 1918 2,198,764 Edwards Apr. 30, 1940
