Abstract: A knife handle such as in a utility knife or box cutter knife with a blade carrier having a planar blade support, parallel flanges and laterally projecting tabs for securing the blade in position on the carrier. The knife handle provides improved retention of a knife blade under torsional loads applied to the blade through the use of two or more longitudinally spaced retention tabs that capture both forward and rearward portions of the blade.

Abstract: A utility tool has a knife blade and a housing. The housing includes a handle for supporting the knife blade adjustably in a manner so that the blade is rotatable on a shaft for supporting the blade. The shaft is carried by a pair of bearings to a plurality of fixed angular positions. Means are provided for locking the knife blade in the fixed angular positions. The housing includes a flat base having an external surface adapted to be supported upon work to be cut by the knife blade. The flat base of the housing includes a hole therethrough for the blade to extend into positions for cutting the work to be located below the base. The means for locking the knife blade in the fixed angular positions includes spring biasing means for holding the means for locking in a locked position. There is a harness for supporting the blade to prevent rotation of the blade during cutting.

Abstract: A cutter for face cutting of carpeting is provided. The cutter includes a floor engaging base and a plate attached to the floor engaging base which is slidable along an inclined path forming an acute angle with the base to form between the movable plate and the base a forwardly facing carpet receiving slot having a longitudinal central axis. A downwardly and rearwardly inclined cutting blade disposed in a plane which is parallel to and spaced to one side of a longitudinal central axis of the carpet receiving slot spans the rear end of the carpet receiving slot at the same acute angle as that formed by the inclined path of the floor engaging base, and is secured in a blade housing having an open-ended slot to provide easy access for adjustment, removal, and replacement of blades. Also provided are coacting bearing surfaces for securing the lowermost end of the blade against deflection, and cutouts for preventing an accumulation of debris around the lowermost corner of the blade.

Abstract: An apparatus for slitting, scoring, and slotting paperboard and the like for the creation of paperboard boxes and other shapes. The apparatus comprises a handle having a built-in three bladed slotting knife that is retractable and quickly allows a worker to create a slot. A retractable slitting knife and a scoring wheel are also affixed to the handle.

Abstract: The refractive surgery keratotomy knife has a handle with a footplate and a holding member for receiving and holding a flared surgical blade fixed to the handle and knife body. The footplate is adapted to be placed against the cornea of the eye. The blade is held by a blade support with the cutting edge of the blade extending beyond the footplate for forming an incision in the cornea of the eye by pressing the blade directly into the cornea tissue.

Abstract: A multi-bladed knife is formed with three parallel blades attached to a handle by means of a screw rod and spring arrangement mounted at front and rear portions of the handle, respectively. The screw rod fastens the blades to the front end of the handle and is rotatable to adjust the transverse spacing between the blades. Application of manual gripping pressure to the rearward portion of the handle against spring bias serves to direct the outer blades into a diverging angle relative to the handle so as to facilitate release of the knife from an object being cut. Release of manual pressure restores the outer blades to their parallel state.

Abstract: A utility knife/box cutter includes an ergonomically-shaped handle portion with exterior stippling to provide a good grasp upon the knife. Within the handle portion, a channel member is received in a forwardly extending cavity and movably receives a cutting blade carrier for longitudinal movement relative to the handle portion. A cutter blade carried in the blade carrier is moveable between a storage position entirely within the handle portion and successively further forward use and replacement positions. Also received into the handle portion is a spare blade holder member pivotal between a blade retaining position entirely within the handle portion and a blade releasing position in which a forward part of the spare blade holder member is pivoted out of the handle portion to present spare blades for removal and transfer to the cutting blade carrier.

Abstract: A safety cutter is provided to prevent un-actuated blade release. The cutter comprises a housing within which a slidable blade can be completely concealed. The blade is connected to a sliding member which controls blade movement in and out of the housing. A safety device is provided having a handle, a main plate and protuberances on the sides such that the sides of the safety device are complementary to the sides of an opening made on one surface of the cutter along which sides the sliding member is movable.

Abstract: A new and improved hand-held scraper apparatus is disclosed for scraping a surface at a plurality of predetermined scraping angles. The apparatus includes a blade support, and the apparatus is used by an operator for scraping a surface with a push-pull scraping motion parallel to the longitudinal axis of the blade support. More specifically, the apparatus includes a rigid handle, a rigid blade support connected to the handle, and a plurality of non-adjustable, blade-receiving slots located in the blade support and arranged at predetermined increments along the longitudinal axis. Each of the blade-receiving slots is oriented at a respective predetermined slant angle with respect to the longitudinal axis. The slant angles are in a range from ninety degrees to zero degrees. A blade is inserted into a respective blade-receiving slot, and, in use, the blade forms a respective scraping angle with the surface that is scraped. The respective scraping angle is supplementary to the respective slant angle.

Abstract: The scalpel includes a handle mounting a scalpel blade at one end and having a slot opening through and between its opposite sides. A guard, including two side members straddling the handle, is mounted for sliding movement between a protective position overlying the blade and a retracted position exposing the blade for use. The side members are connected by an element extending through the handle slot and one or more resilient fingers in the slot cooperates with the element to detent the guard in one of the positions. In a further form, the guard is slidable into a permanently locked position relative to the handle, thereby preventing reuse of the scalpel and inadvertent exposure of the blade.

Abstract: A cutter knife for locking a slider by the engagement between a leaf spring member and an engaging notch of a cutter main body. The leaf spring member has a flat spring section; and a U-shaped locking section projecting therefrom at a right angle therewith. A pair of flat portions of the locking section engage the engaging surfaces of the engaging notch. Consequently, the slider is locked. The operating member moves with respect to a slider main body, thus pressing the locking section downward. As a result, the slider is unlocked.

Abstract: A trimming tool for trimming the edges of wallpaper in which separate razor blades are supported on respective arms slidably mounted on a handle for movement between extended operative positions beyond the edge of a blade member secured to the handle. The arms are urged by springs to the retracted position in which the razor blades do not project beyond the edge of the blade member. Manually engageable projections are provided for the individual displacement of each arm to its extended position against the opposition of the springs, the arms being individually displaceable, one at a time, to bring the cutting edge of the associated razor blade beyond the edge of the blade member into its operative cutting position.

Abstract: A utility knife having a main body formed from a pair of body halves which are assembled together. The main body has an opening at the front with means to prevent the pair of body halves from spreading apart and with means to prevent the blade from swaying from side to side. In addition, means are provided to hold the body halves together without the necessity of using special tools or fastening means.

Abstract: A utility knife having a main body formed from a pair of body halves which are assembled together. The main body has an opening at the front with means to prevent the pair of body halves from spreading apart and with means to prevent the blade from swaying from side to side. In addition, means are provided to hold the body halves together without the necessity of using special tools or fastening means.

Abstract: A utility knife includes a mechanism for detaching the individual blade segments along segmentation lines from a segmented knife blade. The detachment mechanism includes a plunger located at the forward end of the utility knife. An adjustment mechanism advances the knife blade for alignment between the plunger and a retention chamber. Actuation of the plunger exerts a transverse force on the blade segment, detaching same from the remainder of the blade. The retention chamber prevents the detached blade segment from flying from the utility knife where it could cause injury or damage. Optionally, the utility knife may include a spare blade storage compartment and/or a guidance mechanism to facilitate the cutting of straight or curved lines in particular situations.

Abstract: A utility knife especially suitable for use by either right-handed or left-handed persons includes a generally symmetrical casing, as viewed from the side, having a generally pointed leading edge and two surfaces sloping back at equal angles from the point. When a standard razor-like blade is positioned in the knife, the midpoint of the blade between its sharpened cutting edge and non-sharpened opposite edge, lies on an imaginary line extending from the point at the forward end of the casing and generally through the center of the knife. The blade may be positioned with its cutting edge being on one side or the other side of the imaginary centerline. In either position, the cutting edge of the blade will project similarly from the casing when a thumb piece is pushed toward the forward end.

Abstract: A utility knife comprises a lower elongate part shell 1 and an upper such part shell 3 forwardly fitted with interengaging wedging surfaces whereby they clamp together on relative longitudinal movement. This movement is achieved by turning nut 2 on shank 8 to bear on wall 30. The loosening of the nut 2 to unclamp the part shells and thus permit blade 43 to be pushed forward with slider 42 by pushbutton 41 does not separate the part shells 1 and 3 since the end spur 9 of the shank 8 still rides on arresting web 37. Maximum unscrewing of the nut, however, permits separation e.g. for access to stack of spare blades 60 resiliently held at 59 in the rearward part of shell 1 (now unencumbered by the conventional screw-shank), but does not lead to loss of nut 2 because of a complementary detent configuration 25 at the end of the shank and in the end wall 2a of the nut prevents complete nut/shank separation.

Abstract: The utility blade scraper (20) including a handle (12) and a trigger (14) slidably mounted in a trigger receiving housing portion (13) of the handle (12). A utility knife blade (16) being mountable on a blade mounting area (28) of the trigger (14).

Abstract: A household utensil, in particular a fruit or vegetable peeler is composed of a handle, a cutting blade and two support bars parallel to the blade. The blade and at least one of the support bars form a unit which moves in translation towards the handle and can be retracted into the handle. The retraction of the mobile unit into the handle releases the peels wedged between the blade and the support bars. The present invention is particularly useful for peeling asparagus.

Abstract: A utility knife employs a slide having a cantilevered lever for capturing a blade therein. A leading blade in a reservoir is capturable by the slide using a tooth resiliently affixed to the slide which is positioned to enter a locking hole in the blade. The tooth may be withdrawn from the hole in the blade whereby the blade may be removed for reversal and reinsertion or for discard. When the captured blade is removed, the slide may be returned to the loading position for capturing the next blade from the reservoir. As long as a captured blade is engaged by the tooth, the slide is prevented from returning to the loading position, and the loading blade in the reservoir is prevented from advancing.

Abstract: A slider for a cutter knife comprises a slider main body (1) having a protrusion (6) for engaging a cutter blade (40), the blade and slider main body then being inserted into a holder (30) for longitudinal movement therein. A resilient stopper (3) is provided in the slider main body and includes forwardly and backwardly slanted resilient flaps (16,17) whose respective free ends engage two spaced-apart stopper dents (33) formed in the holder. A slider knob (4) is provided on the main body and is movable with respect to the main body to assume a neutral, forward movement, or backward movement position. A release protrusion (5) attached to the slider knob allows both flaps to engage stopper dents when the slider knob is in the neutral position. The release protrusion disengages one or the other of the resilient flaps from the stopper dents when the slider knob is moved to the forward or backward movement position.

Abstract: An improved, adjustable-blade safety knife of the type having a replaceable, single-edge blade slidably-retained within a single-piece handle against a keeper plate having a tang to engage the blade in a side-by-side assembly for protraction and retraction out of one end of the handle has planar guide member extending forward from the cutting end at one side of the knife at a controlled distance from the blade when the blade is extended and at a slight angle relative to the blade such that, when the face of the guide is brought into contact with the surface of a cardboard container, the blade is constrained to cut the side of the carton at a slightly inclined angle from the horizontal and along a line whose spacing from the container top is closely controlled, thereby preventing injury to the container's contents.

Abstract: A knife holder for a utility knife is disclosed comprising an elongated case forming a blade opening at the forward end and an interior guide for guiding a blade carrier and a blade carrier adapted for mounting a blade and being slidably mounted to the guide for selective longitudinal movement between a retracted sheathed position and an extended unsheathed position. The blade carrier has outwardly extending flanges for supporting a blade and a retainer tab for laterally retaining the rearward portion of the blade and the case has a retainer protrusion at the blade opening for laterally retaining the forward end of the blade so that the retainer tab and the retainer protrusion coact to retain the blade to stabilize the blade during usage.

Abstract: A retractable knife handle employs a blade carrier mounting a blade for longitudinally moving the blade between retracted sheathed and extended unsheathed positions. A leaf spring extends from the blade carrier to engage an inwardly projecting cam surface so that when the blade carrier is shifted to the extended unsheathed position, the blade is clamped between the blade carrier and case.

Abstract: A knife handle employs a blade carrier having a planar blade support, a pair of parallel projecting flanges, and a laterally projecting lug for securing a blade in position to the carrier. A lateral retention tab extends from said carrier to capture an upper portion of a mounted blade for laterally securing said blade between said planar blade support and a bearing edge of the tab.

Abstract: An improved cake cutter device of the type having a cutting blade removably attached to a gear housing with rack and pinion means in conjunction with a plate to determine the length, and a helical screw in conjunction with the cutting blade to determine the width of a piece of cake to be cut, and securing means to secure the cut portion of the cake in position with the cutting blade, the improvement comprising a handle mounted perpendicularly to the plane of the housing of the cake cutter and trigger means for moving the rack means, a platform member to support the cake cutter to prevent touching of the cutting blade with the surrounding premises, and a V-shaped cutting blade with a curved apex.

Abstract: The invention generally relates to medicine, but more particularly, to an strument for making corneal incisions useful, for example, in the surgical treatment of myopia.The instrument disclosed herein includes a case, a holder of a cutting member being mounted within the case for reciprocation relative thereto. The holder is provided with a lock member for a cutting member at one end thereof, its opposite end accommodating a stem engaging a screwnut type drive urging said holder into motion. A stop is mounted on the case anteriorly relative to said holder. According to the invention, the portion of the holder facing the stop which is rectangular in cross-section, is preferably provided with a rectangularly fashioned groove along with a lever clip mounted therein, to secure the cutting member in position.

Abstract: A surgical scalpel for use in ophthalmic and other forms of surgery having a blade that can be adjustably extended beyond a foot. The scalpel also includes an indicator for showing the length of the blade that is exposed beyond the foot. The indicator can be calibrated to compensate for variations in blade length and other manufacturing tolerances.

Abstract: An improved retractable knife includes a frontal part of the blade carrier, which has a bottom blade supporting ledge, is embodied as a pallet adapted to firmly mount and support the area of the blade which remains within the handle so that there is no play or rattle of the blade irrespective of whether an apertured or solid blade is mounted on the carrier. The pallet has a plurality of register pins receivable in corresponding notches provided in a trapezoidal type cutting blade at the edge opposite the blade cutting edge.

Abstract: Surgical knife with controllably extendable blade, the blade retained by a blade holder extending through an axial opening in the knife body and connected with a member threadedly retained within the knife body for axial adjustment and also connected to an adjustment knob at the rear end of the knife. Another feature of the knife is a foot configuration which facilitates precise use and control of the knife. Preferably the invention also comprises the knife, as disclosed, in combination with a gauge for visually inspecting blade projection, the gauge indicator consisting of a pair of eccentric circles or portions thereof, the blade projection being measured by comparison with the radial distance between the two circles.

Abstract: A surgical knife includes a blade secured to the knife body and having a cutting edge projecting transversely beyond the body profile. A slotted ski member is movable axially relative to the cutting edge to selectively expose the cutting edge by means of plural thread segments which cooperate to convert rotary motion to said axially controlled axial motion. The position of the ski and blade beyond the body profile enhances visibility of the incision. In the preferred embodiment, the ski is part of a shaft which is threadedly received in a spindle, which, in turn, is threadedly received in the same sense within the knife body. The ski shaft is procluded from rotary motion relative to the knife body and its threads have a greater pitch than the body threads; consequently, axial displacement of the spindle in one direction produces axial displacement of the ski in the opposite direction.

Abstract: This invention is an adjustable multi-purpose knife structure operable to fillet fish and cut selected thickness of meat, cheese, or the like. The adjustable multi-purpose knife structure includes first and second handle and blade assemblies interconnected by a connector and guide assembly and movable relative to each other by an actuator assembly. Each handle and blade assembly includes a blade member secured to a handle member. The connector and guide assembly includes spaced guide pin members operably connected to the adjacent first and second handle and blade assemblies to control the respective lateral movement thereof. The actuator assembly includes an actuator wheel assembly connected to and mounted between the first and second handle and blade assemblies and an actuator lock assembly mounted in one of the handle members. The actuator wheel assembly includes an actuator member that is rotatable to selectively move the first and second handle and blade assemblies toward or away from each other.

Abstract: A replaceable blade type knife in which the blade is replaced at an intermediate point between opposite longitudinal ends of the case body so as to improve the operational efficiency and safety of the knife. The knife includes a restrictive arrangement for enabling dismounting of the sliding member from the guide grooves of the case body at a specific position within the guide stroke of the sliding member other than at the opposite ends of the guide stroke and for unreleasably restricting the sliding member in the guide grooves of the case body at positions other than the specific position so as to allow the sliding member to slide in the guide grooves of the case body, and thus, the knife has been made compact in size so as to be suitable for portable use, with a wide range of application to office works, handicraft, etc.

Abstract: The plastics handle 21 of a retractable blade knife 20, which also comprises a blade 22 and a blade-slider 23, is molded in one piece in a two-part molding tool 50 which can mold several such handles simultaneously. The handle has a series of wall portions, 39, 40, 27 and 43, 44, 28, 48 alternating with apertures 45, 46, 29, 49 and 41, 42, 30 along each side 25, 26 respectively, each wall portion on each side being directly opposite a respective aperture on the opposite side, so that molding tool portions 54, 55 of the molding tool can form the inside surfaces of the wall portions for guiding the blade. Wall portions 27 are formed by molding tool portions 56 with gaps 31 for passage of a manually operable part 32 of slider 23, and also act as detents for the slider.

Abstract: A dandruff remover device including two inclined combs connected to a holder for a blade having a non-cutting edge, which blade is arranged to be extended to against spring pressure into a cleaning position between the teeth of the combs.

Abstract: A knife apparatus comprises an elongated handle member formed with a groove of a C-like cross-section, a slide unit disposed longitudinally slidably within the groove, and a blade slidably disposed in the groove and having a base portion connected to the slide unit. Locking member is provided for the slider unit and adapted to mesh with a tooth train formed in at least one longitudinal edge of the groove, to thereby immobilize the slide unit and hence the blade relative to the handle. A manipulator plate having a cam groove is disposed on the slide unit over the locking member to control the locking member, whereby the slide unit is moved between the locked and the released positions under the control of the manipulator plate.

Abstract: A razor knife has an elongated housing formed of a front housing part and a rear housing part and having a longitudinally extending guide. The rear housing part is backwardly separable from the front housing part and carries a blade holder which has a seat for a razor blade and an actuator button exposed at a slot formed in the front housing part. This holder is displaceable by sliding of the actuator button from a back position with the blade wholly enclosed by the housing into a front position with a portion of the blade projecting forwardly from the housing. A tension spring inside the insert or back housing part continuously urges the holder into the back position. Interengaging formations on the operating button and the housing, however, allow the blade to be held in the outer position so long as a slight inward force is exerted on the slidable actuator button.

Abstract: An elongated knife handle is provided with a blade carrier with a thumb button extending through a longitudinal top slot in the handle and is depressed for manipulating and latching the blade carrier in its sheathed and unsheathed positions. An integral upstanding abutment which extends higher than the thumb button is provided adjoining the forward end of the top slot and extends rearwardly along both sides of the forward end of the top slot to form a recess in which the thumb button is nested when it is in its forward or operating position to prevent the accidental unlatching of the blade carrier during heavy cutting operations.

Abstract: A retractable blade knife 10 comprises an elongate handle 11 which is in two halves 14, 15 clamping therebetween a replaceable blade 12 which can be extended and retracted by means of a cursor 18 and which has "break-lines" 32 for breaking off successive end portions 33. To clamp the blade 12 firmly in use, a screw 27 at the rear end of the handle can be turned to produce relative longitudinal sliding between the two handle halves 14, 15, whereupon an inclined "wedging" surface 17 at the front end of the handle 11 clamps the two halves 14 and 15 together with the blade 12 between them.

Abstract: Mechanism for locking and advancing the blade of a cutting instrument.Mechanism distinguished by a rectilinear blade-holding sheath with longitudinal slit having a series of notches on its lower edge, together with a slider to maintain the locking and the advance of the blade, said slider being molded in one piece of synthetic material comprising structures for supporting the blade, a means of elastic return, and a means of locking by a ratchet mechanism in the notches of the shaped blade-carrier.Application: industrial manufacturing of cutting instruments, particularly of the "cutter" type.

Abstract: A cutter knife comprising a band-shaped blade, a tubular holder for supporting said blade to make it movable in the axial direction thereof, an operating member for locating said blade at any desired position, and means for securing said operating member to any desired position with respect to said holder, said means including a series of engagement surfaces formed in said holder and located in a plane extending in a direction substantially perpendicular to the direction of movement of said operating member and a lug formed in said operating member and releasably engageable with one of said engagement surfaces.

Abstract: An internal pipe cutter comprises a rotatable mandrel having a cutting drum and a guide drum mounted thereon. The guide drum is longitudinally adjustable relative to the cutting drum and controls the depth at which the cutting drum is received inside the pipe. The cutting drum includes a slidably mounted cutter which is projected outwardly into engagement with the pipe by centrifugal force. The cutter comprises a slider block having a radially adjustable cutting blade. In addition, one surface of the cutting drum has an access slot which communicates with the slider block enclosed inside the drum. The access slot allows a tool to be inserted into the cutting drum as necessary to unjam the cutter without having to dismantle the cutting drum.

Abstract: A knife comprises a knife handle or grip having a channel for receiving slidably therein a blade holder having a blade secured thereto so that the blade is withdrawn outwardly as it wears out. A series of notches are formed in the knife grip, while a V-like leaf spring is mounted on the blade holder, whereby the blade holder and hence the blade are held securely at predetermined indexed positions relative to the knife grip through engagement between the V-like leaf spring and the selected notch. A locking structure releasably locks the V-like spring member so that the latter is prevented from being accidently disengaged from the notch.

Abstract: A cutting blade holding handle for a segmented removable blade.A cutting blade holding handle having a rectilinear hollow body with curved outer faces and having an inner guide consisting of two identical grooves facing each other to slidably mount a removable blade and a lower parallel auxiliary groove which mounts a unitary slider connected to the blade and having a finger piece provided with two oppositely inclined faces for manipulating the blade, said body also having between the blade and its rear face a blade wedging mechanism having external control and latching means.

Abstract: An adjustable blade knife is made by extruding a continuous strip of extrudable hardenable material with the strip having a planer web between thicker marginal portions and opposing slots in the marginal portions, individual knife handle bodies are stamped from the strip and a knife blade is assembled to each body by inserting the blade in the opposed slots of the body. The blade is preferably preassembled to a slide plate with the slide plate and blade positioned together in the handle body slots to slide along the web portion of the handle body which is provided with a longitudinally extending slot having at least one side wall of an irregular surface configuration to co-operate with positioning means provided on the slide plate to facilitate locating the blade-plate sub-assembly in adjustable positions of use.

Abstract: The invention relates to hand knives of the type comprising a hand grip which houses a strip steel blade with snap-off ends, which when worn can be removed to reveal a fresh operative blade tip. The hand grip comprises an elongated body with a longitudinal slot along which a blade-shifting element of stiffly flexible construction may be moved between a variety of adjustable positions.

Abstract: A hand-held cutting device is provided for opening cartons, such as cardboard boxes, without damaging the contents within the carton. The cutting device comprises a handle having an elongated flat bottom surface which is adapted to slide along the outer surface of the carton during a cutting operation. A cutting blade is secured to the handle and extends outwardly through an opening in the bottom surface of the handle for engaging and cutting the carton. A guard is secured to the cutting blade across its outwardly extending end and includes a portion extending forwardly of the cutting edge of the cutting blade. This forward portion of the guard is curved towards the handle and serves to deflect the contents of the carton away from the cutting blade during a cutting operation. Preferably the upper front edge of the guard forms a second cutting edge so that the guard easily pierces the carton during the initiation of a cutting operation.

Abstract: A knife for cutting cartons comprises a movable blade carrier, and blade, mounted in a stepped guide for positive blade location at any of a plurality of selected locations, within a handle having an extended area lip feeler adjacent a handle opening such that the blade may be presented through said opening in any of a plurality of lengths corresponding essentially to the thickness or thinness of a carton wall so that the knife cuts the carton and not its contents, consistent with safety for the operator, economy of manufacture and use and compactness.

Abstract: A cutting blade holding handle for a segmented removable blade.A cutting blade holding handle having a rectilinear hollow body with curved outer faces and having an inner guide consisting of two identical grooves facing each other to slidably mount a removable blade and a lower parallel auxiliary groove which mounts a unitary slider connected to the blade and having a finger piece provided with two oppositely inclined faces for manipulating the blade, said body also having between the blade and its rear face a blade wedging mechanism having external control and latching means.