Abstract: In a fastening device for fastening a bolt, a male thread is formed on a side surface of a bolt head part, and a part to be engaged is formed on a top surface of the bolt head part. The fastening device includes a bit having a tension rod having a rod female thread part, and an engaging part installed inside the tension rod and engaging the engaged part, the bit causing the bolt to rotate where the engaged part and engaging part are engaged; a supporter surrounding the tension rod in the circumferential direction such that the lower end part thereof protrudes below the lower end part; a sensor for sensing vertical compression force acting on the supporter; a first motor for causing the bit to rotate about the axis; and a second motor for causing the tension rod to rotate about the vertically extending axis.

Abstract: An electric hammer includes a striking device having a clamping mechanism. The clamping mechanism includes a clamping element, a sliding element, a first biasing device and a second biasing device. The sliding element is provided with a guide portion in which the clamping element is slidable between a first position where the clamping element is closed and a second position where the clamping element is opened. The biasing force generated by the first biasing device is smaller than that of the second biasing device when the clamping element is in the opened position.

Abstract: A wrench with a quick rotatable driving head includes a handle, a driving head and a quick-disengaging unit. The quick-disengaging unit is composed of a fixing member secured with the driving head, an operating member inserted through the handle and fitted around the fixing member, and a restraining element transversely provided between the fixing member and the operating member and the handle. The handle and the driving head can be separated by the quick-disengaging unit so that the driving head, with the quick-disengaging unit acting as a pivot, can quickly screw or unscrew a thread locking member, and the operating member can be restrictedly positioned on the fixing member by the restraining element, able to prevent the handle and the driving head from separating.

Abstract: A driver including a handle, lever, swivel cap, shaft, and a tip mechanically connected to the lever configured to engage a screw. Engaging the lever causes the tip to either compress or expand so as to lock the screw to the driver. According to one exemplary embodiment, the cap can be translated releasing the lever, thereby releasing the screw from the tip. According to one embodiment, the cap is a swivel cap allowing for jeweler style use. Advantages of the present system and method, according to various embodiments, include a tip compressing a feature that is within an outer diameter of the screw allowing a driver, or a portion thereof, to have a maximum diameter equal to or smaller than the maximum diameter of a screw.

Abstract: In a screwdriver for bone screws, having a handle and rotationally fixedly held thereon a shaft, the free end of which has a non-circular cross section and is insertable in a positively locked manner in a non-circular receiving opening in the head of a bone screw, at least one expander element being mounted so as to be displaceable in the longitudinal direction in the shaft and so as to slide, when displaced in the longitudinal direction, along a slide surface in the area of the free end of the shaft in such a way that it projects laterally over the contour of the shaft, in order to simplify the actuation of the at least one expander element, it is proposed that the at least one expander element be pretensioned by an elastic spring element in the direction towards the free end of the shaft and be retractable against the action of the spring element in the shaft until it no longer projects laterally over the contour of the shaft.

Abstract: A driver including a handle, lever, swivel cap, shaft, and a tip mechanically connected to the lever configured to engage a screw. Engaging the lever causes the tip to either compress or expand so as to lock the screw to the driver. According to one exemplary embodiment, the cap can be translated releasing the lever, thereby releasing the screw from the tip. According to one embodiment, the cap is a swivel cap allowing for jeweler style use. Advantages of the present system and method, according to various embodiments, include a tip compressing a feature that is within an outer diameter of the screw allowing a driver, or a portion thereof, to have a maximum diameter equal to or smaller than the maximum diameter of a screw.

Abstract: A tool for installing a threaded object includes a bit or inner implement that has a tip for engaging a head of the threaded object, and a sleeve surrounding the inner implement for securing the threaded object to the tool during the installation process. The sleeve includes plural arms at least some of which have inner lips that engage the head of the threaded object to hold the head against the tip. The inner lips are chamfered to facilitate engagement and disengagement between the sleeve and the head of the threaded object. The sleeve is able to translate to a limited extent relative to the inner implement, in order to pull back and disengage from the threaded object head as the threaded object is received into a threaded opening.

Abstract: A screw guide and a method of driving a screw into a work surface utilizing a driving tool and a screw guide. The screw guide having a body configured to be coupled with a rotating clamp of the rotary tool, the body defining a chamber for receiving a screw, and a support member coupled with the body and configured to maintain the screw in an orientation substantially parallel with the axis of the rotating clamp.

Abstract: Clamp for screwed fastening member, including: a main body formed with an internal axial passage; a rod body connected with the main body; two clamping members each having a bottom clamping end, the clamping members being pivotally disposed on the main body and movable to open or close the clamping ends thereof; and a predetermined number of pressing member disposed between the clamping members and the main body for forcedly pressing the clamping members and making the clamping ends thereof extend into the passage and close to clamp an article. A screwed fastening member can be positioned in the main body and clamped by the clamping members, whereby the clamp can be rotated to drive and screw the screwed fastening member.

Abstract: An eyeglass screwdriver has a generally cylindrically shaped body having a first end and a second end with a driver head attached to the first end of the body for screwing in and out screws. A swivelable and rotateable head at the second end allows pressure to be transmitted to the body and driver head. The swivelable and rotateable head includes a ball, a retainer, and a cap to affix the head to the body. The preferred embodiment has the cylindrical body with a bore on axis to the body and a bore perpendicular to the axis of the cylindrical body located so that it intersects the bore on axis of the cylindrical body and further includes a spherical depression on the opposite end of the cylindrical body. There is also a magnet located in the bore to help hold the driver head.

Abstract: A screwdriver adapted to be coupled to an electric drill for automatic rotation thereof including an interior member having a lower extent with a circular cross-section and a screwdriver tip at its end. The interior member has an upper extent of an enlarged cylindrical shape with a hexagonal component extending rearwardly thereof. An exterior cylindrical member of the screwdriver has a lower extent of a reduced diameter and an upper extent of an enlarged diameter and has an interior bore extending therethrough. The bore of the upper extent is adapted to receive the upper extent of the interior member and the lower extent of the exterior cylindrical member is adapted to receive the lower extent of the interior member with the screwdriver tip extending through the lower end thereof.

Abstract: A driving device for driving a fastener (2) includes a centering mechanism (9) for centering and guiding the fastener (2). The centering mechanism includes centering elements (10, 26, 36, 37) that are tiltably or slidably connected to a mounting body (3) to be movable in directions tangential to the fastener. The centering elements (10) have contact surfaces (19) for contacting the fastener (2) that are each substantially parallel to the direction of motion of the respective centering element (10). In this manner, the centering elements (10) cannot be deflected radially away from the fastener, and any forces applied laterally outwardly by the fastener against the contact surfaces (19) are rigidly received and resisted by the centering elements (10) and the mounting body (3) in which they are held.

Abstract: An instrument for harvesting an iliac bone graft comprises an elongate handle having a proximal gripping portion terminating in a substantially blunt striking surface, and a distal working portion including a pair of longitudinally extending, transversely spaced apart blade retaining slots. A pair of chisel-type blades are adapted for being releasably, lockably housed in the slots. The blades are retained in the slots by set screws, and by overhanging lips which engage the blades when fully inserted in the slots. An instrument for inserting an iliac bone graft into a disc space comprises an elongate handle having a proximal gripping portion terminating in a substantially blunt striking surface, a distal working portion including an enlarged abutment head on its terminal end, and a slide portion disposed between the gripping portion and the working portion, the abutment head having a distal abutment surface for engaging an iliac bone graft.

Abstract: A nose piece feeder for a power driver in which articles are guided from a feed passage into a discharge passage by a pair of jaws which are movable from a guide position to a driver access position. When the driver is activated to expel an article from the discharge passage, the jaws are moved to the driver access position permitting the driver to pass between them.

Abstract: A screwholder device comprising jaws which form two halves of an axial passageway down which a screw is driven. The jaws are hinged at the rearmost end and resiliently held together by a narrowing at the front exit ends. The screw is driven down the passageway and is held by the jaw ends while being driven to a certain extent into a surface, and the screwhead pushes the jaws apart to allow the screw to exit from the device during final securement of the screw.

Abstract: A cylinder liner sleeve puller has four legs having flanged feet at their bottom and being connected by four pivotably mounted pivot arms. The arms are pivotably connected to a central hub, which arrangement forces the lower ends of the legs outward when the hub is manually moved downward. In operation, the legs are inserted into the cylinder so that their bottom extremities are below the lower end of the liner sleeve. The hub is then pressed downward, forcing the lower ends of the legs outward until the flanged feet are directly below the liner sleeve. A jack support plate having spaced holes for the legs is then passed over the legs and rests on the engine block. A hydraulic jack is placed on the support plate, and a top plate is fastened to the top of the legs. When the jack is activated, the plunger pushes the top plate upward, causing a corresponding upward movement of the legs, thereby removing the liner sleeve.

Abstract: In combination with a miniature jewelers' screwdriver, or similar tool, a barrel made of a stiffly flexible material (preferably a specified plastic) incloses the shaft of the screwdriver. The barrel provides at its working or tip end a set of flexible elements combined with a head holding groove to provide a gripping head which securely holds miniature screws or similar fasteners registered with the screwdriver tip. At the barrel's other end a coil spring around the shaft of the screwdriver exerts pressure to extend the barrel's tip beyond the bit of the screwdriver so that it will act to engage and hold screw heads.

Abstract: The invention is intended for use with threaded fasteners, screws, bolts and similar devices, in their almost limitless applications to assembling objects and structures. These fasteners exist in many types, each requiring a special tool bit.On many occasions screws or other fasteners must be installed or removed in locations difficult of access and of which clear view may not be obtained, also where use of two hands is not possible. This invention is particularly intended for these situations.The invention comprises basically a combination of a barrel (11 or 811) and collar (20 or 201), preferably made of stiff but flexible plastic, which fit over and enclose a tool for threaded fasteners, either with a fixed bit or one which can accept insertable bits. The barrel (11) provides at its working or tip end a set of flexible elements (31) which act to grip screw heads and hold them registered with the tool.

Abstract: A plurality of devices are disclosed for supporting threaded screws in a plane normal to a surface into which the screws are threaded. Each embodiment includes means for supporting the shank of the screw at points intermediate the ends thereof rather than only at the head thereof. The means is resiliently expandable to permit passage of the head of the screw past the supporting means for disengagement of the device after the screw has obtained substantial threaded purchase with an engaged structure.

Abstract: A tool driver and fastener that prevents the driver from lifting up off the fastener. The fastener has at least one undercut slot that matches with a blade on the driver to prevent uplift. The driving tool and fastener mate with one another and have respective cross-sectional configurations that can interlock temporarily for allowing a screw or a bolt with a slot or head with a plurality of sides to be driven into or removed from a work place without movement of the driver up off of the fastener. The driver may be a screw driver or wrench with a blade in a plane transversed to the longitudinal axis of rotation of the driver. The fastener may include a main slot in one plane containing the center line of the fastener and a second slot transverse to the first slot and perpendicular to the first slot.

Abstract: For screwing a threaded fastener into an internally threaded member, there is disclosed a screw driver apparatus which comprises a casing formed with a through bore to receive the threaded fastener, a tubular member formed with a supplying passageway having a front end open to the through bore for supplying the threaded fastener into the through bore, a screw driver reciprocably and rotatably received in the through bore and having a front end portion to be slidably guided by the through bore and formed with a depression for retaining the threaded fastener therein, and reciprocating means for reciprocating the screw driver with respect to the casing between a first axial position where the front end portion of the screw driver projects outwardly from the casing to force the threaded fastener to be screwed into the internally threaded member and a second axial position where the front end portion of the screw driver is positioned rearwardly of the front end portion of the supplying passageway to allow the thre

Abstract: In combination with its own bit, or with a screwdriver, a barrel made of a stiffly flexible material, preferably a specified plastic, slides over the bit or screwdriver shaft, and provides at one end a gripping head for screw heads, and at the other a quick-lock clutch operated by a twist of a rotary collar. The gripping head can not only grip surely a screw head placed in it, as for starting, but can locate by feel an installed screw in a hidden recess difficult of access, and facilitate one-handed withdrawal of the screw, with sure retention of the head. The device can be made as a screwstarter, with a set of sizes and bits for all sizes and type of screws, or as barrels adaptable to the full range of available and existing screwdrivers. A split-barrel variant can be assembled with the use of threaded collars, one of which is the clutch collar and the other the gripping head, over the shaft of a screwdriver which has a widened blade, square shaft, or for some other reason requires a special adaptation.