Crack-proof structure of the nail pulling groove of a hammer

Year	Description
1999	Invention patented by John Chen on July 7th, 1999. Abstract: A crack-proof structure of the nail pulling groove of a hammer used in a hammer with a nail pulling groove at rear end thereof is disclosed, a V shape nail pulling groove is formed on the meddle portion of the distal end. The lower portion of the nail pulling groove of the hammer has a penetrating round hole. A cylindrical rubber plug is inserted in the round hole for preventing concentration of stress forces or dispersing stress force. Thereby, the inner stress due to the impact of the hammer is absorbed by the rubber plug. Therefore, the nail pulling groove is prevented to crack as the hammer serves to knock a nail or an object.
Source: selected by the editor from original sources.

Invention: Crack-proof structure of the nail pulling groove of a hammer