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.

Abstract: An improved impact tool of the nonrecoil type is provided, to include a molded thermoplastic jacket encasing a hollow core canister having a flowable filler material such as small steel pellets or the like disposed therein and adapted to shift about within the canister for absorbing and dissipating impact shock forces. The hollow canister, which may be lightweight in construction, is partially filled with a selected quantity of the flowable filler material and the residual canister volume is occupied by at least one pulverable slug prior to placement of the canister into a mold for formation of the jacket thereon under heat and pressure. The pulverable slug has sufficient structural integrity to withstand molding temperatures and pressures, so that the slug and filler material cooperatively define a rigid structural backstop to prevent deformation of the hollow canister during the jacket molding step.

Abstract: A shock-absorbing claw hammer includes a handle, a claw and a striking head. Vibrations and shock in the handle and head, as well as recoil, caused by the striking head striking an object are at least partially reduced by shock-absorbing means.

Abstract: A shock absorbing hammer, comprising an elongated shaft (2) and a hammer head (1). An end portion (2a) of the shaft is obliquely oriented in a somewhat wider recess (6) in the hammer head (1) so as to permit a limited pivotal movement in one angular direction, the movement being damped by a shock absorbing material in said recess.

Abstract: An improved impact tool of the nonrecoil type is provided, to include a molded thermoplastic jacket encasing a hollow core canister having a flowable filler material such as small steel pellets or the like disposed therein and adapted to shift about within the canister for absorbing and dissipating impact shock forces. The hollow canister, which may be lightweight in construction, is partially filled with a selected quantity of the flowable filler material and the residual canister volume is occupied by at least one pulverable slug prior to placement of the canister into a mold for formation of the jacket thereon under heat and pressure. The pulverable slug has sufficient structural integrity to withstand molding temperatures and pressures, so that the slug and filler material cooperatively define a rigid structural backstop to prevent deformation of the hollow canister during the jacket molding step.

Abstract: A shock absorbing handle grip includes a sleeve-like rubber grip body sleeved onto the coupling shaft of the handle of a hand tool, a substantially U-shaped flat packing bar inserted from a rear end opening on the grip body and clamped on the coupling shaft of the handle of the hand tool and an end cap fastened to the rear end opening of the grip body, the end cap, the grip body and the packing bar forming an air bag around the coupling shaft of the handle of the hand tool.

Abstract: A hammer, preferably a workshop hammer including a head and an adjoining handle. The head is provided with at least one impact surface and a cavity which is at least partly filled with particulate material so as to dampen the recoil of the hammer. The hammer reduces recoil, rotation, and vibration of the hammer whereby an ergonomic hammer is obtained. The hammer is provided with a rigid longitudinally extending element in the handle and a counterweight at a free end thereof.

Abstract: A hand-held vibration-damped striking tool has a striking head and an elongated handle having a core member with spaced apertures along its length extending therethrough and a vibration-damping canister at the end of the core member. The canister has a peripheral wall and an intermediate transverse wall providing a cup portion at its one end firmly seating the core member, and a compartment portion in which is disposed the vibration-damper. The peripheral wall of the cup-shaped portion has apertures extending therethrough. A grip of resiliently compressible material encases the core member and canister, and the material of the grip extends through the apertures of the core member and cup portion of the canister to effect firm engagement therewith.

Abstract: A hand tool with a pivotal head portion includes a first manually rotatable collar which causes movement of a second slidable collar along a handle of the tool to secure the head portion at a desired angle with respect to the handle. Serrations on the tool head and slidable collar releasably engage each other to lock the head at the desired angle. The tool head is mounted on the handle using either ball and socket or tongue and groove configurations.

Abstract: A hand operated impact implement having a tuned vibration absorber includes a head for impacting an object, a handle connected to the head, and a tuned vibration damper attached to the handle and/or head to damp overall handle/head vibration of the impact implement after impacting an object.

Abstract: A composite hammer is provided having enhanced vibration dampening characteristics. In one aspect of the invention, the composite hammer includes a handle having an elongated body and a cradle attached to a terminal end of the body. An elastomeric member substantially encapsulates the cradle and at least partially encapsulates a head structure to thereby secure the head structure to said handle. In another aspect of the invention, the hammer includes a substantially rigid elongated body having a chamber therein. An elastomeric material filler is positioned within the chamber of the hammer body to thereby enhance the vibration dampening characteristics of said hammer.

Abstract: A soft-grip handle for hammers and the like has an elongated core member and a synthetic resin sleeve extending along the core member adjacent its tool mounting end. The sleeve has a peripheral collar extending about its end spaced from the tool mounting end, and a grip member of relatively resilient material extends about the core member from its grip end and has an end portion overlying and interlocked with the collar on the sleeve. The core member desirably has a channel therein extending from the grip end and the grip member has a portion disposed within the channel to interlock the core and grip members.

Abstract: A dead-blow nonmarring hammer has its head and handle portions unitarily formed on half shells which are welded together. Hammer face inserts are received in ends of the housing portion and impact plates can be provided inwardly of the inserts to protect the inserts against wear by the mobile mass within the housing.

Abstract: A hammer having a plastic molded handle. The rear end of the handle has a longitudinally extending bore hole that is filled with a gelatinous material that dissipates shock vibrations. An end cap is secured to the rear end of the handle by sonic welding. The front end of the handle has both a vertical and a horizontal longitudinally extending slot and these slots intersect each other at a substantially 90 degree angle. A plastic wedge unit formed from intersecting wedge sections is driven into the slots in the top end of the handle to secure the hammer head and the wedge unit is sonic welded to the handle.

Abstract: A composite split head percussive tool including a rigid load bearing framework which carries a non-load bearing head assembly. The non-load bearing head assembly comprises a pair of axially aligned split heads that are interconnected to each other by an elastomeric link. The elastomeric link is encased and fixed within the tool body. During use of the tool, the elastomeric link acts as a dampener that suppresses the struck end rebound of the tool. When one head is struck against a surface, the elastomeric link allows the unstruck head to move toward the struck head and provide a secondary blow that inhibits the tool's struck end from bouncing away from the surface thereby providing the hammer with a unique "dead-blow" characteristic.

Abstract: An improved manufacturing process is provided for surface protective striking tools such as hammers and mallets. An elongate hollow core is fitted with impact heads at opposite ends thereof and filled with a flowable filler material such as small steel pellets prior to placement of the core into a mold cavity for injection mold formation of an outer encasement. During the molding step, the filler material provides a substantially rigid structural backstop which enables a core of lightweight construction to withstand typical injection molding parameters. The molded outer encasement ensheathes a skirt portion of the impact heads and any exposed portion of the core member to bind the impact heads to the core member. The molded outer encasement does not extend over an impact face of each impact head. A handle may also be molded with the outer encasement. A striking tool thus formed is removed from the mold, and some or all of the filler material is drained from the core through an open port.

Abstract: A maul assembly including a maul head having an annular body with an annular outer wall concentric to an annular inner wall and an annular chamber within the body disposed between the two walls. The annular walls and chamber are circumferentially disposed about a head center axis which is coincidental with a handle center axis of a handle attached to an end of the head. The chamber is partially filled with a quantity of flowable inertia material preferably round steel shot and preferably in a range of about 50% to 75% of the chamber's volume and preferably with steel shot.

Abstract: An improved hammer is composed of a handle and a head fastened to the one end of the handle. The head is provided centrally with a hole for receiving therein a threaded rod of the handle. The hole of the head is provided in the outer end thereof with a threaded area. Located at the side opposite to the threaded area is a polygonal area having a section polygonal in shape and greater than that of the threaded area. In addition to the threaded rod engageable with the threaded area of the head, the handle further comprises a casing of plastic material covering entirely the threaded rod and filling the gap formed between the threaded rod and the polygonal area of the hole of the head.

Abstract: In a claw-type hammer, a shock-absorbing device is provided which includes an elongate elastic band or cord which captured within grooves of a hickory plug in regions which abut against internal surfaces of a socket into which the plug is press-fit. The plug is dimension and configurated in relation to the socket in the hammer head to provide at least some degrees of freedom of movement of portions of the elastic cord so that the elastic portions can vibrate or oscillate substantially independently of the natural oscillatory vibrations of the hammer head caused by impact. The tendency of the elastic cords is to at least to partially cancel or neutralize and, therefore, dampen the natural vibrations of the hammer head.

Abstract: A hammer includes a shaft having a beam and two bars and a hand grip having an opening and two holes for engagement with the beam and the bars, each of the holes includes a length longer than that of the bar such that a space is formed in each of the holes when the bar is engaged in the hole. The spaces form a shock absorbing configuration of the handle of the hammer.

Abstract: A hand tool such as a hammer is provided with an internally reinforced jacketed handle. The tool head, having an eye extending therethrough, is attached to the handle by interconnected grooves on the handle and a thermosetting material filling the grooves, an upper recess, and tapered pockets formed between the walls of the eye and the handle.

Abstract: A baseball bat (10) made of a rigid material and having an impact portion (12) and a handle portion (13). A tubular member (14) is positioned in the interior of the bat at substantially the handle portion (13) and has a first end (24) and a second end (25), said first end (24) having an opening (28) therein which is removably sealed with a plug (17). A hollow spine member (16) is secured within said tubular member (14) and is preferably attached to said plug (17) and to said second end (25) of the tube member (14). A slurry (15) composed of a plurality of particles (26) and a fluid (27) is disposed within said tubular (14). The tubular member (14) may be secured within said bat by adhesives (30) or by mechanical fastening apparatus.

Abstract: A hammer, for use in absorbing some of the reaction force upon impact, is provided. This hammer included a head and a handle and a connector therebetween. The connector has a hinge and has a spring member. The hinge has a pair of spaced plates fixedly connected to the handle and has a center plate disposed between the pairs of spaced plates and fixedly connected to the head. A hinge pin passes through three respective holes in the three plates. The spring member is a collar composed of a urethane material. The collar encloses the hinge and fits snugly between a flange on the head and a flange on the handle, so that bending of the collar causes a compression force on one side of the collar. The hinge has stop surfaces for limiting tilting of the head in one rotary direction about the hinge pin. The hinge allows tilting in an opposite rotary direction about the hinge pin, and allows compression of the collar. A second embodiment has a spring member which is a bent wire spring member.

Abstract: A hand tool, such as striking device like a sledgehammer, having replaceable head elements, which device comprises a handle having a raised extension on one end and a threaded cavity therein, and a replaceable head element, having a cavity therein; an insert having a hole therein to fit into the top part of the cavity of the head element, a threaded bolt, an a retaining tubular, elastomeric element, subject to expansion on axial compression, whereby various head elements of different cavity size may be secured to the extension of the handle by placing the threaded bolt through the insert hole and through tubular retaining element and threading the bolt into a threaded cavity of the raised extension to axially compress and expand outwardly the tubular elastomeric element into a frictional and shock-absorbing relationship with the interior surface of the head element cavity, thereby providing a hand tool device by which head elements having various cavity dimensions may be rapidly and efficiently secured to the

Abstract: A hammer having a helve which includes a core attached at one end to a hammer head and a grip surrounding the core, the grip having a pair of axially extending passages therethrough, the passages being located in diametrically opposed relation to each other along a direction which is parallel to the striking direction of the hammer head. The axially extending passages absorb shock by allowing the grip to deform when the hammer head strikes an object which allows the user to maintain a tight grip of the hammer.

Abstract: An improved handle structure for manually engagable, manually manipulated implements and devices such as hammers, saws, hand power tools and the like. The handle structure is an elongate structure adapted to be comfortably gripped in a hand of a user. The handle is resilient and yieldingly compressable within the grip of a user on a plane which is normally substantially parallel to the mean plane of the palm of a user's hand and which provides a non-static, shock absorbing grip structure. The handle structure is substantially rigid and non-yielding on that plane which is normal to said plane of the user's hand. The handle further includes a soft resilient fingertip supporting pad that conforms with and yieldingly supports the user's fingers and soft resilient palm engaging parts that yieldingly conform with the palm of the user's hand at primary force transmitting points between the palm and the handle structure and which provides for circulation of air therebetween.

Abstract: A hammer including a head core and a handle core which are made of a metallic material and are respectively imbedded in head and handle portions made of a resin material so as to form a generally T-shaped integral body. The head core and the handle core are separated from each other by a suitable distance by a portion of the resin material at which the head and handle portions are connected to each other.

Abstract: This invention relates to a hammer which includes a handle which is made from a flexible material and carries, in combination, rod and strip shaped reinforcing elements which extend over the effective length of the handle. The or each strip shaped reinforcing element is normal to the strike direction of the hammer head. The reinforcing elements are held apart by spacers located along the length of the element.

Abstract: A shock and vibration handle for application to the hand gripping portion of the normal handle of an impacted, vibration sensitive item, such as, a tennis racket, a racquetball racket, a golf club, a baseball bat, and other impact devices, such as hammers, and the like. The shock and vibration absorbent handle includes an inner tubular isolation shell of shock and vibration absorbent material mounted on the hand gripping portion of the normal handle. An outer tubular shell is mounted around shock absorbent material, and has it wrapped therearound a covering material. The absorbent material may be employed as longitudinal strips, spaced around the periphery of the handle or an integral, single piece tubular member. The inner tubular shells of absorbent material may be mounted on an inner tubular mounting shell which is mounted on the handle, and which has operatively mounted therein a cantilever spring beam having a weight on the free end thereof.

Abstract: A handle for a striking tool includes a hand-fitting elongate body adapted for supporting an impact head at one end. The handle body is provided with transverse finger receiving recesses, complementary grooves within opposed side faces and a longitudinal thumb receiving channel. In addition, an angular tail extension provides a palm and finger grip. The interaction of the user's hand and fingers at alternate locations along the handle body provide for selected power strokes using an arcuate motion about a finger pivotal point.