Abstract: In an engine of a cylinder-head first cooling type, cooling performance for a cylinder head and a cylinder block is enhanced. Cooling water from a water pump is supplied via a water jacket in a cylinder head to a water jacket in a cylinder block. The water jacket in the cylinder head is defined to extend along opposite sides of a plurality of cylinders disposed in a row, and has a cooling-water inlet and a cooling-water outlet provided at lengthwise one end thereof and the lengthwise other end thereof, respectively. The water jacket in the cylinder block is defined to surround outer peripheries of the plurality of cylinders disposed in the row, and is shielded at one point by a shield member, and has a cooling-water inlet provided on one side of the shield member to communicate with the cooling-water outlet in the water jacket in the cylinder head and a cooling-water outlet provided in the other side of the shield member.

Abstract: An eye shade is presented including a first side connected to an intermediate layer. A second side is connected to the intermediate layer. A first outer eye portion and a second outer eye portion are formed from the first side, the intermediate layer and the second side. The first and second outer eye portions extend outward. The first outer eye portion and the second outer eye portion are convex shaped.

Abstract: A modified towel for use while bathing, lifting and drying babies, where the towel wraps around the caregivers body and remains there securely. It is constructed of absorbent fabric and shaped like a tapered rectangle or elongated trapezoid, with a slit near the tapered end. The tapered end of the towel wrap drapes over one shoulder and is secured in the hip region by pulling either corner through the slit. The wrap is worn while bathing an infant, and is easily transferred from adult caregiver to baby for drying when the bath is done.

Abstract: A multilayered material is provided that exhibits therapeutic effects for relieving the pain and swelling of various forms of arthritis (particularly osteoarthritis), delaying the onset of osteoarthritis, or preventing hypothermia or alleviating conditions caused by hypothermia. The flexible, breathable multilayered material includes a first layer of soft and hypoallergenic material (e.g., cotton, silk, linen), a second layer of soft, heat retentive material (e.g., wool, cashmere) contacting the first layer, and a third layer of water repellent material contacting the second layer. Additionally, the multilayered material provides a thin, flexible, breathable fabric that can be used to construct various garments, devices, and gears to combat harsh weather conditions.

Abstract: A multilayered material is provided that exhibits therapeutic effects for relieving the pain swelling of various forms of arthritis (particularly osteoarthritis), delaying the onset of osteoarthritis, or preventing hypothermia or alleviating conditions caused by hypothermia. The flexible, breathable multilayered material includes a first layer of soft and hypoallergenic material (e.g., cotton, silk, linen), a second layer of soft, heat retentive material (e.g., wool, cashmere) contacting the first layer, and a third layer of water repellent material contacting the second layer. Additionally, the multilayered material provides a thin, flexible, breathable fabric that can be used to construct various garments, devices, and gears to combat harsh weather conditions.

Abstract: A garment for enclosing an infant or small child is structured to be selectively adjustable in length to accommodate infants of various sizes or increasing growth, and is configured to facilitate use of the garment with car seats or carriers while also being structured to provide cushioning for the child while in the car seat or carrier.

Abstract: This invention concerns a protective body vest for protecting against impact upon a human torso when worn by an athlete during sporting activities. The invention comprises a multi-layered, one-piece garment comprising a vest sized and shaped to be worn on the torso of an athlete with a protective padding that can be customized by the wearer based on safety, comfort and athletic performance concerns. The invention further comprises a shoulder portion with oversized apertures for the arms, an anterior portion, a pair of lateral portions and a posterior portion with a tapered design in the inferior-most region. The invention further either utilizes an offset opening or offset openings located off set from the medial line of a human torso to protect the heart, or is donned/removed in an over-the-head, pullover manner. The invention may further utilize an overlap or flap to cover and protect the region of the offset opening.

Abstract: A sleeve for use in protective garments, the sleeve including a lower edge, an upper edge, and a glove flap. The glove flap may include an upper edge and a positioning feature, the glove flap being disposed between the upper edge of the sleeve and the lower edge of the sleeve, the positioning feature being disposed proximate to the upper edge of the glove flap, the glove flap having sufficient length so that at least a portion of the glove flap may be positioned below the lower edge of the sleeve, the positioning feature adapted to retain the glove flap in such position.

Abstract: A heat resistant glove for use in the food service industry, that facilitates handling of hot serving trays, utensils, and similar food serving equipment with dexterity and nimbleness while presenting an attractive appearance to those being served. An under side portion of tightly woven and heat resistant fabric such as Keviar protects the server from discomfort while handling food trays. A top side portion of natural fabric, polyester, or other open weave fabric presents the appearance of light-weight serving gloves commonly worn by food servers.

Abstract: Hats such as baseball-type caps and sun visors which have a brim projecting from the forward part of the hat, or sailor hats or Stetson-type (or cowboy-type or fedora-type) hats that have a brim extending about the periphery of the hat are provided with a device on or forming the brim that presents two or more composite graphic images or sets of images. The hat brim includes at least two interleaved series or sets of sections are arranged in a wave-like manner that each present a composite image or a set of images. The sections of each series of interleaved sections generally face in a common direction so that images or parts of images displayed by the sections of a same series are viewable together, and the sections of different series face in different directions. An observer can view a first image or set of images on the brim from a first direction and second image or set of images on the brim from a second direction.

Abstract: A banded earmuff for protecting a worker's hearing, includes a band (12) formed of a wire frame (34) and a flexible polymer sheath (32) around much of the wire frame and a pair of pods (14,16) that press around the wearer's ears. The wire frame includes parallel wire lengths (50, 52) with opposite end parts joined by loops (70, 72). Each pod that seals around the ear has a mount (40) that is coupled to the wire length end parts. Each mount has a groove (42) with opposite sides that receive the pair of wire length end parts. This allows the pod to pivot on the wire length end parts, and to also slide along them. The sheath is molded with a pair of slits (114, 116), and middle length parts of the wire frame are installed through the slits into passages (54, 56) in the sheath.

Abstract: A chamois for use within the seat area of a cycling garment includes a non-woven polyester interfacing or batting layer with a bottom surface that engages the cycling garment. The polyester layer provides a pad area for association with the buttocks of a cycling individual, two side pad areas for association with the upper inside thighs of the individual, and a pad area for association with the lower abdominal area of the individual. A thin and low hardness synthetic foam layer has a shape that complements the polyester layer, and a bottom surface thereof engages a top surface of the polyester layer. A thick, high hardness, synthetic foam layer is associated with the thin foam layer and occupies the pad area association with the buttocks. A synthetic leather layer has a shape that complements the shape of the polyester layer and a bottom surface thereof engages the top surface of the thin foam layer and the top surface of the thick foam layer.

Abstract: This invention concerns a removable protective shoulder pad for protecting against impact to the top, anterior, posterior or lateral regions of the shoulder and upper arm, or portions thereof, during sporting activities comprising one or more sections that can be secured to a protective body vest a shirt, a vest or other garment. The removable protective pad, comprising an outer layer or layers of rigid, semi-rigid or semi-flexible material and an inner layer or layers of flexible, semi-flexible or semi-rigid material, is secured to the shoulder portion or upper arm portion of the protective body vest, the shirt, the vest or other garment by a fastening device or devices. The removable protective pad may further be secured to the upper arm and/or shoulder by a fastening device or devices.

Abstract: The present toilet and sink drain plunger seals either around or in a toilet or sink drain hole despite the hole's size, configuration and location. The plunger includes an elongated upstanding handle connected to the top of a depending, preferably frusto-conical, open bottomed bellows in the sidewalls of which are formed a vertically stacked series of interconnected horizontal pleats. The plunger further includes a series of toilet drain hole seals connected to each other and to the bottom of the bellows to form a unitary whole depending below the bellows. The seals are of progressively smaller size from the uppermost to the lowermost and all feature inwardly and downwardly curved sealing surfaces. The seals are rings or doughnuts molded into the plunger body. The bottommost seal bears a short vertical small diameter annular wall depending therefrom and which acts both as a seal and a seat for the plunger.

Abstract: A drain assembly for a pool cover which includes a drain fitting positioned in a hole formed in the pool cover; a screen connected to the pool cover and positioned above the drain fitting to minimize the amount of debris entering the drain fitting; a buoyant barrier assembly connected to the pool cover adjacent to a perimeter of the screen to maintain a predetermined volume of water on the pool cover; and a flexible conduit connected at a first end to an outlet end of the drain fitting. A second end of the conduit is connected to an opening formed in a side of the pool. The barrier assembly includes a tubular shaped buoyant material housed within a pocket formed by two sections of material. The self-draining pool cover can also include floats for preventing portions of large pool covers from sagging into the water.

Abstract: An illumination device is provided on the back surface side of the bath tab vessel for receiving water formed of a transparent material or a translucent material. Furthermore, in a bath tab unit having a double-hulled structure consisting of an inner vessel and an outer vessel, the inner vessel is formed of a transparent material or a translucent material, and an illumination device is provided in a space between the inner vessel and the outer vessel.

Abstract: A washing platform has a generally flat upper work surface. A spout is located adjacent the washing platform and provides a stream of fluid which impinges the work surface. The bowl can be removably placed on the washing platform to receive water from the spout. The bowl has an aperture through the bottom and a gasket which is attached to an exterior surface of the bowl around the aperture. When the bowl is placed on the work surface, the gasket provides a seal that inhibits flow of fluid there between until a user lifts the bowl to drain the water there from.

Abstract: A medicine cabinet for mounting on a wall above a sink includes a cabinet frame and a door pivotally attached to the front of the cabinet frame. A mirror is attached to the exterior surface of the door and has an aperture there through. A shelf assembly slidably extends through the side opening of the cabinet frame, and has a first position in which the shelf assembly is received within the first cavity and a second position in which the shelf assembly projects outwardly from a side of the cabinet frame. A spout passage extends through the aperture in the mirror and emits a stream of water. A control valve can be mounted to the cabinet frame to control the flow of water from a supply to the spout.

Abstract: A hammock and a hammock bag are combined to permit use of a hammock on cooler days. The hammock has a generally rectangular body section with given dimensions, an upper surface, parallel side edges, and parallel top and bottom edges. The hammock bag is adapted for releasable attachment to the upper surface of the hammock rectangular body section with side ties that attach to the side edges of the hammock body section. The hammock bag has a flexible rectangular center section with dimensions generally corresponding to the dimensions of the hammock body section, and parallel side edges positioned adjacent the body section side edges; first and second side sections extending inwardly from the center section side edges over the center section; and releasable ties extending from the center section side edges to attach the bag to the body section side edges.

Abstract: A bed foundation is provided which is constructed of blow-molded plastic and may be assembled without using tools. The components of the bed foundation all have lengths of less than 60 inches and may be packaged together in a container having a length less than 60 inches and a girth less than 84 inches, so as to avoid shipping penalties. The components are constructed and arranged to allow disassembly and storage when the foundation is not in use. One embodiment provides a bed foundation that, when assembled, has a top panel which overhangs the side rails to permit an oversized mattress to be placed thereon. Additionally, bed legs are provided that are configured to mate with contours in the foundation.

Abstract: In accordance with at least one preferred embodiment of the present invention, a patient table comprising a patient support surface for supporting a patient during a medical procedure, a base supporting said patient support surface, a monitor displaying medical information relating to a medical procedure, and a support member mounted to said patient table for supporting said monitor, wherein said support member includes an adjustment linkage interconnecting said monitor and support member and providing movement of said monitor of the monitor relative to said support member in at least three degrees of freedom.

Abstract: In accordance with at least one preferred embodiment of the present invention, a patient table is provided, the patient table comprising a patient support surface for supporting a patient during a medical procedure; a base supporting the patient support surface; a monitor displaying medical information relating to a medical procedure; and a pivot arm having a first end connected to the base and a second end connected to the monitor; a pivot release member provided on one of the monitor and the pivot arm for releasably securing the monitor and the pivot arm at predetermined angular positions with respect to the base.

Abstract: There is described method and apparatus for supporting a patient's body in a MR scanner, including supporting it to rotate about its longitudinal axis and cant about a point on the longitudinal axis. Also provided are method and apparatus for supporting a patient's head and neck and using a surgical head-holder. Yet another embodiment of the invention provides method and apparatus for attaching first and second stirrups to a member supporting the patient.

Abstract: An adjustable height platform comprising a bottom platform, a top platform and a scissors linkage secured between the top and the bottom platforms. The scissors linkage includes scissors legs which pivot about a pivot axis. A drive system provides a horizontal force to the scissors linkage. An unlocking mechanism lifts the pivot axis in response to the horizontal force and unlocks the scissors legs from a collapsed, retracted, and aligned position. After unlocking the legs, the horizontal force continues to raise the top platform with respect to the bottom platform.

Abstract: A bariatric hospital bed with full feature capability to enhance the care and treatment of bariatric patients. Among the features are fully adjustable and retractable siderails, bed raise-and-lower features, head-up and leg-down features for converting to a seated position, as well as Trendelenburg and reverse-Trendelenburg features. An integral scale assembly and radioluscent capabilities with a built'in X-ray tray are also provided together with redundant, easy-access controls in a pendant as well as in both siderails. An improved footboard is also provided for use as both a foot-rest and a step.

Abstract: Support device can be adjusted by use of a motor and is used for the upholstery of a piece of furniture for sitting and/or laying upon, such as a mattress of a bed. A base may be provided with at least two relatively adjustable support components. The support device may have at least one drive unit detachably connected to the base and provided with a housing having a recess. A rotatably mounted shaft engages with the recess when the drive unit is assembled. The shaft engages with a support component to be adjusted and can be rotated by the drive unit. The drive unit is placed on the shaft from the support side so that the housing of the drive unit is arranged between the support components and the shaft. Thus, the support device has a lower profile than conventional support devices.

Abstract: A surgical pillow is provided for supporting, cushioning and positioning a patient while in a prone position on an operating table during rectal surgery. The pillow comprises an elongated, self-sustaining, flexible body unit of compressible material having shape return memory. The body unit is provided with an indented upper face defined by a longitudinally extending, centrally located channel and chamfered downwardly inclined patient positioning surfaces on opposite sides of the central channel. Converging, inclined side surfaces of the body unit are configured and strategically located to accommodate the axilla areas of a patient while the patient is supported on the body unit. A removable cover that substantially conforms to the configuration of the body unit is provided in full covering relationship to the body unit.

Abstract: A mattress assembly for supporting a patient includes a body support portion having a head end, a foot end, and a knee support portion. The body support portion has a first air zone extending from the head end to the knee support portion and a second air zone extending from the knee support portion to the foot end. The mattress assembly also includes a control module configured to supply air to the first and second air zones to maintain the first air zone at a substantially constant first pressure and to maintain the second air zone at a substantially constant second pressure. The second pressure is less than the first pressure to provide reduced pressure on a patient's calves and feet located on the second air zone.

Abstract: A patient support is provided comprising a frame including a deck support and a step deck positioned on the deck support. The step deck has an upper deck, a lower deck, and a side wall, the upper deck being spaced apart from the lower deck to define a recess of the deck. The step deck includes a first section and a second section configured to articulate relative to the first section.

Abstract: A combination utility and sporting knife includes a longitudinal knife handle, a utility blade carrier disposed within the handle and linearly movable within the handle, a utility blade carried by the blade carrier, a manual movable blade moving member operatively connected with the blade carrier, and a pivotally movable blade pivotally connected to the handle. The utility blade and the pivotally movable blade are extendable from opposite ends of the handle. The utility blade edge and the pivotally movable blade edge both are exposed towards the bottom portion of the handle when the pivotally movable blade and the utility blade are in operative positions thereof so that the bottom and top portions of the handle retain their relative bottom and top orientations for use of either the utility blade or the pivotally moveable blade.

Abstract: A m ulti-purpose hand tool assembly is equipped with a spring biased pressing button having a downwardly bent lateral edge which can be in firm registration with a retaining cut of a selective tool bit so as to make the tool bit held in place when external force is applied thereto. The pressing button is pivotally fixed in place by a pivot pin to the hand tool assembly. A plurality of tool bits, such as a screw driver, a knife, a spanner and etc., are pivotally mounted onto a bolt locked in place by a nut at one end of the hand tool assembly. Each tool bit has an end provided with a working head and an opposite end equipped with a mounting hole through which the bolt is led so as to permit the multiple tool bits to be selectively pivoted about the bolt. At the pivot end of each bit is disposed at least the retaining cut which can be registered with the downwardly bent retaining end so as to firmly hold each selective tool bit in an operation position.

Abstract: A solution for forming a graft substrate containing a graft initiator, a catalyst for activating the graft initiator, a polymerizable silicon softener, and at least one additional prepolymer, each of the softener and the prepolymer which includes a functional group for reaction with an activated site on the substrate for grafting thereto and water. The treated fiber exhibits excellent crockfastness, color fastness, and abrasion resistance, and has a soft hand.

Abstract: An agent and method for treating biodegradable synthetic yarns fabricated from a polymer comprising lactic acid as a main component, which enable improved lubricity, cohesion, etc. to be so imparted to the biodegradable synthetic yarns that the yarns can be prevented from fuzzing and breaking at every step from spinning to down-stream step, especially at a false twisting step and improved in terms of bulkiness, providing yarns having improved mechanical properties in a stable manner. The agent of the invention comprises 0.1 to 30 weight % of a specific functional agent, and a lubricant and a surfactant in the total amount of 70 weight % or greater, and has a friction coefficient in the range of 0.04 to 0.35.

Abstract: This invention is a dry cleaning business model algorithm in which articles such as fabrics and the like are subjected to tumbling in a basket or chamber while heated air is circulated through said chamber. While being tumbled, the articles are exposed to a binary vapor consisting of water and solvent under pressure which loosens or removes debris and soils from the articles. The debris and soils are carried by the air and binary vapor to a filter where the soils and debris are captured with the binary vapor continuing on to a condenser where the binary vapor is converted to binary liquid. Upon conclusion of the cycle the articles are removed from the chamber.

Abstract: A composition comprising at least one hydroxide compound and at least one complexing agent effective for dissociating the at least one hydroxide compound in sufficient quantity to effect lanthionization of keratin fibers. The at least one complexing agent is chosen from compounds comprising at least one group of formula (I) and salts thereof. Also disclosed is a method for lanthionizing keratin fibers to achieve relaxation of the keratinous fibers and a multicompartment kit comprising an activating composition and at least one hydroxide compound.

Abstract: Methods and kits for lanthionizing keratin fibers to achieve relaxation of the keratin fibers, and methods and kits for re-waving keratin fibers comprising applying to keratin fibers a pretreatment composition comprising at least one reducing agent chosen from thiols, sulfites, and derivatives thereof, applying to the pretreated keratin fibers a composition comprising at least one hydroxide compound, and heating the keratin fibers.

Abstract: The object of the present invention is an agent for dyeing fibers obtained by mixing two components and characterized in that one component (component A2) contains at least one carbonyl compound and the other component (component A1) contains at least one indoline derivative of formula (I) or a 3H-indoline derivative of formula (Ia) 1

Abstract: The invention is directed to fiber-reactive polymeric dyes, which comprise a dye covalently bound to a carboxyl-containing polymer. By “fiber-reactive” is meant that the polymeric dye will form a chemical covalent bond with the fiber, textile, or web to be treated, via functional groups for binding or attachment to the fibers of the webs to be dyed. The invention also encompasses textile dye preparations comprising a solution or suspension of the fiber-reactive polymeric dye. The resulting polymeric dye preparations have improved colorfastness and retention on the textile or web fiber structure, even after a large number of washings. The textiles or webs treated with the fiber-reactive dye are also included in the invention.

Abstract: Bi-level methods of customizing orthotics are provided. In a first level of customization, orthotics are selected based upon the needs and personal characteristics of an individual. In a second level of customization, inserts are added to the orthotics based upon at least the individual's foot type.

Abstract: Toothbrushes that utilize a rotating eccentric weight positioned in or near the head of the toothbrush to cause movement of the head, and methods relating to same.

Abstract: An electric toothbrush is disclosed in which a brush body is simultaneously oscillated and reciprocated for brushing every gap between teeth. The electric toothbrush includes a casing main body, an arm extending above the casing main body, a brush body arranged in a top end of the arm, and an ultrasonic motor arranged in a top end inside of the arm for driving the brush body. An output shaft of the ultrasonic motor and the brush body are connected to each other by connecting piece. In this construction, the brush body is movable along the output shaft. The electric toothbrush further includes a reciprocating mechanism, which is provided between the arm and a holder of the brush body, and which reciprocates the brush body.

Abstract: A trowel includes a blade, a handle having two ends formed integral with the blade with such as a molding or a forging process. An outer cover is disposed on the outer peripheral portion of the handle by such as a molding process for allowing the users to comfortably grasp the handle. The ends of the handle are formed integral with two seats and two ramps of the blade, and each has one or more notches for receiving bulges of the outer cover and for solidly securing the outer cover onto the handle and for preventing the outer cover from moving relative to the handle.

Abstract: Absorbent mop strands of a mop are held captive by a pair of walls in a sleeve at the terminal ends thereof after the sleeve is slid over a mop head. The mop strands are wrung dry by rotating the sleeve with respect to the handle of the mop.

Abstract: A vehicle washing brush assembly which includes a cylindrical holder configuration having plural cloth or foam pads secured thereto and configured to be centrifugally extended radially outwardly from the holder and into surface treating engagement with a vehicle surface. A first longitudinal length of the holder has a selected number of separate cloth or foam pads oriented around the perimeter of said holder so that the ratio of the number of cloth or foam pads per 360° of the holder to the outer diameter of the holder is in the range of 5 to 12. A second longitudinal length of said holder having a selected number of separate cloth or foam pads oriented around the perimeter of the holder so that the ratio of the number cloth or foam pads per 360° of the holder to the outer diameter of the holder is 6.0 or less.

Abstract: A duster cleaning member derives its suction power from a vacuum cleaner to which it is operatively coupled. A duster made of any material received thereby is cleaned by the filtration system of the vacuum cleaner which captures the dust and exhausts cleaned air back into the home or office environment.

Abstract: An air sweeping apparatus having a head assembly, a debris conveyer and a receptacle. The head assembly includes a front skirt which is selectively positionable away from a surface to be cleaned to enable debris of different densities and sizes to be collected. After the front skirting of the head assembly is moved past debris, the debris becomes entrained within a flow of air formed by a line of pressurized air as it traverses the surface and the interior surface of the main chamber of the head assembly. Preferably the air flow in the head assembly is skewed with respect to the direction of travel to urge the entrained debris towards an output end of the main chamber. When debris reaches the output end of the main chamber it is transported to a debris receptacle by a low pressure conduit which discharges entrained debris into a first hopper or bin.

Abstract: A pair of bushing including an outer member having an outer main body and an outer flange; an inner member having an inner main body inserted into the outer member, an inner flange, and a through hole; and an elastic member disposed between the outer member and the inner member. The bushing are press-fit into a top aperture and a bottom aperture of a bushing-attaching hole in a suspension cross-member, respectively. When each bushing is press-fit into the apertures there exists a predetermined clearance between the inner members. For fixing the suspension cross-member to vehicle body, a stud is inserted through the respective through holes and a nut is fitted onto a stud and screwed until the inner members abut each other.

Abstract: A retarding device insertable between two members connected to rotate relatively about a hinge axis, and which opposes and so retards such rotation in predetermined manner; the device having: a substantially cylindrical support carried integrally by a first of the rotationally connected members and substantially coaxial with the hinge axis; a coil, spring fitted interferentially to the support and terminating with two opposite radial arms projecting towards a second of said members connected to each other for relative rotation; and a retaining seat carried integrally by the second member and on which the arms of the spring rest, on opposite sides, and are stressed by the second member, as a consequence of the aforementioned relative rotation, to deform the spring in such a direction as to progressively reduce and, beyond a certain point of the moving path of the other member, substantially eliminate, the interference with which the spring is fitted to the support.

Abstract: A refrigerator handle assembly includes a base plate which is initially attached to the face of the refrigerator, such as through the use of screws or the like. The base plate includes tapered surfaces, preferably at longitudinally spaced positions. Once the base plate is secured, a portion of the handle is placed over the base plate and slid relative to the base plate whereupon the tapered surfaces coact with structure on the handle such that an interference fit is developed to draw the handle tight to the face of the door. With the handle in this position, one or more mechanical fasteners are driven into a body portion of the handle from a back side of the door.

Abstract: A simple suspension carrier component for bottle portability that is installed around the neck of a bottle to provide user convenience. The suspension component is of one-piece stretchable plastic construction. The suspension component has an open end consisting of a snap-lock recess with a passage formed in one extremity that accommodates the placement inside the snap-lock recess of an insertable hook disposed at its other extremity. A retaining bar is situated at the top edge of the snap-lock recess entrance, thereby constituting an engagement section after the insertable hook is slipped in and, furthermore, a pendant release button extends laterally parallel to the top side of the passage. The insertable hook has a curved back extremity that is angled upward and, furthermore, after the insertable hook is slipped into the snap-lock recess, the tip of the curved back extremity becomes engaged against the inner side of the retaining bar and the insertable hook cannot be drawn out to the rear.