Abstract: A method and device for marking trim miters for a bull-nose corner is provided. Embodiments for wainscotting, crown molding and baseboard are also disclosed. The device comprises a molded, hand-held structure which envelopes a portion of the bull-nose corner and provides marking guides for marking correct placement of trim. The method discloses utilization of the device.

Abstract: A tape measure device has an elongated blade with a central concave-convex segment with at least one planar segment adjoining edgewise the central concave-convex segment to form a junction that extends substantially along the entire length of the elongated blade. During formation of the blade the junction is annealed to avoid formation of a flaw or incipient fracture along the junction.

Abstract: This invention is directed to an automatic tape measure having a housing, a tape assembly, and a light assembly. The tape assembly is supported in the housing and contains a reel having a tape adapted to extend and retract from the front wall of the housing. The light assembly is received in the housing and contains a power source, a light source, a switch, and a lens. The lens is coupled with an opening in the front wall of the housing and is adapted to move between a first position where the light source passes through the lens and a second position where the light source projects downwardly onto the extended tape.

Abstract: A tape measure system for efficiently marking a measured object. The tape measure system includes a housing with a recoil unit containing a length of a tape measure, a dispensing neck extending from the housing for guiding and dispensing the tape measure, and wherein the dispensing neck includes a guide edge for marking a surface of a measured object. A pair of teeth extend from the dispensing neck for selectively engaging and marking the surface of the measured object. The dispensing neck includes a recessed portion exposing a portion of the tape measure for allowing frictional engagement of the tape measure by the user.

Abstract: The present invention provides improved footwear that overcomes many of the limitations of the prior art. A shoe according to the present invention, includes a sole member with an upper surface for receiving a user's foot and a lower surface for contacting a support surface. The sole member has a first sidewall and a second sidewall that are spaced apart and extend between the upper and lower surfaces. The sole member also has a slot defined therethrough, with the slot extending between the first and second sidewalls. A strap has a pair of opposed ends and a midportion therebetween. The midportion is designed to be received in and retained by the slot. The slot also has a closure member for joining the opposed ends. When the midportion of the strap is received in the slot and the closure member joins the opposed ends, the strap and the sole cooperate to form a shoe upper for receiving the foot.

Abstract: Footwear, particularly athletic shoes, that has a sole structure copying support, stability and cushioning structures of the human foot. Still more particularly, this invention relates to the use of the shoe upper portion to envelop one or more portions of the shoe midsole in combination with portions of the shoe sole having at least one concavely rounded portion of the sole outer surface, relative to a portion of the shoe sole located adjacent to the concavely rounded outer surface portion, and at least one convexly rounded portion of the inner surface of the midsole component, relative to a portion of the midsole component located adjacent to the convexly rounded portion of the inner surface of the midsole component, all as viewed in a frontal plane cross-section when the shoe sole is upright and in an unloaded condition.

Abstract: A sole for a boot, as well as a boot having such sole, for walking on ice and/or snow having, in at least a central zone of the walking surface, a series of strips that are contiguous at rest, and crampons at its outer periphery. Each series of strips is interrupted by channels extending both in the transverse and longitudinal directions, and each crampon has a channel for evacuating water.

Abstract: A snow removing machine has an auger for plowing and collecting snow, a rotatable blower for throwing snow collected by the auger, and a shooter for guiding the snow thrown by the blower so that the snow reaches a selected point. The blower has a central shaft part and blades extending radially outwardly from the shaft part. Each of the blades has one pair of laterally spaced guide walls projecting from a distal end portion thereof in a direction of rotation of the blower. The pair of guide walls for each of the blades extend divergently from each other towards a distal end of the blade.

Abstract: A lock that includes a wedge that is used to releasably secure separable components of an assembly together. The wedge can be used with a spool. The wedge and spool are threadedly coupled together to drive the wedge into and out of an opening in the assembly without hammering or prying. The direct coupling of the wedge and spool eliminates the need for bolts, washers, nuts and other hardware so as to minimize the number of parts. As a result, the lock is inexpensive to make, easy to use, and unlikely to become inoperative because of lost or broken parts or due to fines or other difficulties encountered in harsh digging environments. Further, the wedge can be driven into the assembly to provide the degree of tightness necessary for the intended operation and/or to re-tighten the assembly after incurring wear during use. A latch assembly is preferably provided to securely hold the wedge in place and avoid an undesired loss of parts during use.

Abstract: The invention pertains to an ironing board pad with a top and bottom layer of cloth, which attaches to any standard size ironing board. There are elastic straps at the wide end of the pad, and a sleeve-like nose for attachment at the narrow end of the ironing board. Each of the two layers of the pad is inundated with a combination of corn starch, borax, processing aids, preservatives, ironing aid and perfume. Thus, a person is able to simply place the article of clothing between these layers and use a steam producing iron to get clothing carefully starched, without the use of an awkward spray starch can.

Abstract: An improved outdoor illuminated display device. The device generally comprises a modular housing, a base member and a plurality of lights positioned in the housing—either horizontally or vertically. A plurality of display modules are positioned on the housing and backlit by the lights. A door member is pivotally connected along its upper edge to the housing covering the modules. A pair of gas-assisted spring members are provided between the door member and the housing. Air gaps or air vents are provided in order to allow air circulation in the housing. A second member above the door member is provided for holding and displaying posters and other advertising and promotional is materials. A plurality of clamping members hold the display materials in place. The second member can be illuminated or non-illuminated. Various modular units can be provided to increase the size and display space provided by the device.

Abstract: A battery powered, hand-held signaling device having an illuminated display capable of selectively displaying illuminated indicia including the words “STOP”, “SLOW” and “GO” is privided. The illuminated indicia are preferably color-coded, whereby the word “STOP” is displayed in illuminated red letters, the word “GO” is displayed in illuminated green letters, and the word “SLOW” is illuminated in yellow letters thereby maximizing recognition by an observer, such as the driver of an approaching vehicle. Selection of a particular message to be displayed is accomplished by user actuation of suitable electrical switching circuitry. In alternate embodiments, the device may be adapted for displaying a host of other illuminated messages, such as “TURN RIGHT,” “TURN LEFT, ” “PARK,” etc.

Abstract: A display system for displaying media on a ski-lift chair is provided. A main body portion is disclosed, having clamps to hold it to the restraint of the ski-lift chair. A plurality of frames are provided along a top surface of the body portion for holding printable media sheets, such as maps and advertisements, in place. Printable sheets are disclosed as transparent plastic with reverse printed imagery thereon.

Abstract: Integral extensions to aid in the extraction of ammunition magazines from ammunition pouches are provided by permanently attaching a handle to existing or modified floor plates. In one embodiment, a substitute floor plate is molded with a handle projecting from its outer face. In a second embodiment, a handle with a grip and a terminal end is provided with an attachment structure on the terminal end. Floor plates are then either modified by cutting anchoring holes to allow for the attachment of such handles without hindering use in an ammunition magazine or molded with said anchoring holes.

Abstract: A tool to facilitate the removal of a barrel bushing on a handgun such as the 1911 automatic pistol. The tool has a handle which foldably receives a wrench having an aperture conforming to the shape of bushing. In the extended position, the wrench is provided with ridges or serrations to frictionally engage the fingers or hands of the user. Additional accessory items such as knife blades or other tools may be foldably secured to the handle.

Abstract: A control device for marine animals comprises an electrical device that applies an electrical voltage directly to a marine animal in order to shock the marine animal, for control thereof. The device preferably comprises a pole or rod having electrical prongs at one end which my be applied to the marine animal, thereby applying and electrical signal having a voltage, amperage and frequency that stuns and/or shocks the animal. The character of the electrical signal is such that the animal is temporarily paralyzed, so that it may be safely handled by humans for bringing it into a watercraft without otherwise damaging the animal.

Abstract: Apparatus 10 discloses a reusable, washable split cavity fishing lure having a “banana-like” shape that assembles and disassembles by means of snap counter parts 28 and surgical tubing 20. The lure 10 encompasses a hollow cavity 32 having a plurality of scent releasing apertures 26 producing a powerful scent trail that attracts game fish 12. The cavity 32 may be filled with bait 36 or scent pad 34. By adjusting the leader 16 position to one of a plurality of leader apertures 14 the lure 10 is designed to spin at various rates of speed. The present invention 10 also provides for an additional element in the form of posts 48 depending from the base of the lure to prevent hook 18, 22 from getting out of alignment.

Abstract: This invention is a fishing device that is used in its preferred embodiment to attract fish to an object. The invention comprises an untold number of similar features that are mounted to the structure of a strand. When fastened into a loop, the similar features on the strand in the preferred embodiment attract fish.

Abstract: An artificial seedbed is disclosed comprising a foundation of virgin, re-processed or waste pulp formed by an aqueous based compression system, a dry non-woven air-blown system containing a cellulose-based binder or adhesive or a dry non-woven needle punched system containing a cellulose-based binder or adhesive. The seedbed can contain seeds, fertilizers, growth hormones, hydrogels, herbicides, fungicides, insecticides, or any other additive to promote the germination and the growth of the seeds and surrounding landscape.

Abstract: A method that accounts for environmental factors by measuring the starch and fiber degradation characteristics of a variety of genetically different crop plants and grain from crop plants in real time to determine how the crop plants should be conserved, processed and blended into a feed formulation that results in optimum productivity of the ruminant animal. A method further including determining starch digestibility characteristics of a set of crop plant samples comprising grain of said crop plant; developing a prediction equation based on said starch digestibility characteristics, obtaining a grain sample from a crop plant, determining in real time starch digestibility characteristics by NIRS of said sample by inputting data from said NIRS into said equation, storing and/or milling said grain on an identity preserved basis, and determining the amount of said crop plant to incorporate into a feed formulation based on the starch digestibility characteristics.

Abstract: A shaft operator assembly for moving a door assembly which includes a movable door leaf and a door shaft attached to the door leaf for common movement together. A shaft connecting unit includes a shaft connecting element and a connecting plate element and connects a driven member of the shaft operator assembly with minimal space requirements to the door shaft. The connecting plate element, which can be secured to or integrally configured with the driven member, is relatively thin to permit the jack shaft operator and connecting plate element to be shifted into a fitted position even where little space is available. The shaft connecting element is mountable non-rotatably on the door shaft and includes an axial opening extending through the shaft connecting element for receiving the door shaft.

Abstract: The invention improves accuracy of engagement of a pinion and a rack with each other in an automatic opening/closing device for a vehicle. In the automatic opening/closing device for the vehicle and for automatically opening and closing an opening/closing member provided to a vehicle body, the device includes a motor for generating a driving force for driving a pinion for rotation, a sliding member having a rack engaged with the pinion, and a rail member for positioning the sliding member and for guiding the sliding member in a predetermined direction. The sliding member and the opening/closing member are connected through a connecting rod. A base member is integrally formed with a motor fixing portion and a rail fixing portion. The motor and the rail member are fixed to the base member. As a result, it is easy to improve accuracy of positioning of the pinion and the rack and to improve accuracy of engagement of the pinion and the rack with each other.

Abstract: A finger guard for preventing fingers from getting into the gap between a sliding door of an elevator and a stop surface of a profiled edging strip. A profiled fillet forming the finger guard comprises an elastic tongue extending from the profiled edging strip obliquely outward toward the surface of the sliding door and a supporting element disposed in the gap to keep the tongue clear of and at a distance from the surface of the sliding door.

Abstract: A device mountable to a gutter for removing debris therefrom includes an elongated shaft with proximal and distal end portions positionable within the gutter, a plurality of debris-removing members mounted about the shaft and between the proximal and distal end portions thereof, a plurality of brackets spaced along the gutter for receiving the shaft therethrough, and a mechanism for operating the device causing the debris-removing members to rotate in a select direction as desired by a user. The operating mechanism may rotate the debris-removing members in an oscillating path or unidirectional path and a sensor may also be included to selectively toggle the device between on and off modes, without direct user input.

Abstract: A snow guard for a shingled roof in which the flat attachment strap positionable between layers of shingles has mounted thereon a detachable mounting bracket that projects upwardly from the attachment strap. The body portion of the mounting bracket has a wedge-shaped receptacle on the top surface to mount devices such as a snow guard attachment, which can be locked into place on the mounting bracket by a threaded fastener that passes through the mounting bracket into the base of the snow guard attachment. The snow guard attachment can be easily replaced with aesthetically different snow guard members or a snow fence that spans across several aligned mounting brackets.

Abstract: A modular patient room includes a plurality of modular wall panels or units having various configurations. In some embodiments, the modular wall units have water dispensers. Headwall units having water dispensers are also disclosed. The water dispensers are configured to filter water or to sterilize water.

Abstract: Lateral motion devices are used in conjunction with shear assemblies to further dissipate shear forces on buildings. In one embodiment, the lateral motion device is interposed between the shear assembly and the upper portion of the wall to permit relative motion therebetween and to absorb and dissipate a portion of the shear forces through expansion and/or compression of spring members. In another embodiment, the lateral motion device is interposed between the foundation and the bottom of the shear assembly and in yet another embodiment, the lateral motion device is embedded in the foundation so as to be interposed between the anchor bolt and the foundation. The shear assembly can be either a panel assembly or an A-frame assembly.

Abstract: The present invention is directed to a brace apparatus having a core member configured to absorb energy generated by seismic or other forces by undergoing plastic deformation. A buckling restraining assembly is included for maintaining the structural integrity of the brace after the core member has undergone plastic deformation. The buckling restraining assembly includes one or more bearings is located proximal the core member. The bearings are adapted to minimize friction between the core member and the buckling restraining apparatus. An air gap is positioned between the core member and the one or more bearings of the buckling restraining apparatus are adapted to prevent bonding of the core member and buckling restraining assembly. Projections are included in the core member of the brace apparatus to minimize movement of the middle portion of the core member relative to the buckling restraining assembly.

Abstract: Method and apparatus for securing a building foundation form disposed on a moisture barrier membrane. The method includes the steps of positioning one end of a concrete form stake in a mating structure of a plug, penetrating the moisture barrier membrane with a tip end the plug, and forming a seal between a flange extending around a periphery of the plug and the moisture barrier membrane.

Abstract: A transition support for flooring extending between a floor area of a high height and a floor area of a low height, said support being in the shape of a wedge which is generally unnoticeable by persons walking across the support and which does not jostle wheeled vehicles crossing the support.

Abstract: An impact-resistant shutter does not fracture upon impact from debris. The shutter includes a decorative panel and a support panel. The decorative panel has an outer surface and an inner surface and includes a first chemical composition. The support panel has a first surface and a second surface and includes a fiber composition. The fiber composition is incompatible with the first chemical composition. A second chemical composition is integrated into the support panel at the first surface. The second chemical composition is compatible with the first chemical composition. Due to this second chemical composition present at the first surface, the fiber composition in the support panel can be bonded to the inner surface of the decorative panel. The fiber composition provides impact resistance to the decorative panel to prevent fracturing of the decorative panel upon impact from debris.

Abstract: A corrosion-resistant tension member, particularly a tendon for prestressed concrete, comprising a bundle of tension elements arranged inside a sheathing, has at its ends anchoring devices each with an anchor plate. On the side of the anchor plate facing away from the open air side, a seal having tension elements running through it and having a sealing plate are arranged, the sealing plate being fixed in place on the side facing away from the anchor plate opposite the anchor body against longitudinal displacement. Between the anchor plate and a pressure plate butting against the sealing plate, pressure-transferring means, for example, a pressure tube, are provided, having a length calculated in such a way that a longitudinal displacement of the anchor plate that occurs when the tension elements are being tensioned, actuates the exertion of surface pressure to the sealing plate for activating the seal.

Abstract: An apparatus and method for reducing corrosion in post-tension construction is described. An anchor is engagable with a post-tension tendon and comprises an anchor base and sheath engaged with the anchor base, and a cap for sealing the portion of the tendon within the anchor. The sheath can include an extension having a contact end distal from the anchor base for contacting the tendon as the tendon is inserted through the extension and the anchor base aperture. The cap can extend completely through the anchor base for connection to the anchor base of a sheath or sheath extension attached to the base. A pocketformer is attachable to the sheath for generating a void in concrete.

Abstract: A bracket for use in retrofitting building panels to a structure is provided with forward, rearward and top walls which define a channel therebetween. The channel is sized and shaped to substantially enclose existing fasteners on the structure to substantially prevent lateral movement of the bracket along the existing building panels. The lower end portion of the bracket is shaped to marry the profile of the existing building panels. A single series of fasteners secure the new building panel to the bracket, the existing building panel and preferably the frame of the structure.

Abstract: Generally, the invention is a dry stack building block for constructing a masonry wall. The dry stack unit has a front section having an outer surface, an inner surface, a bottom surface, and a top surface. The dry stack unit also has a rear section substantially parallel to the front section having an outer surface, an inner surface, a bottom surface, and a top surface. Two or more webs coupling the inner surface of the front section to the inner surface of the rear section have a top surface and a bottom surface. Two or more pairs of lugs may extend above the top surface of the front section and the top surface of the rear section. Each pair of lugs may have a first lug offset from a second lug in an axis perpendicular to the inner surfaces of the front section and the back section.

Abstract: A filter assembly is provided that has a filtering screen and a skeletal structure, the skeletal structure being attached to the filtering screen. At least one of the filtering screen and the skeletal structure form a plurality of downward extending channels.

Abstract: A concrete anchor float that, in one embodiment, facilitates the placement of anchor bolts that protrude from concrete constructions, such as foundations. The concrete anchor float of the present invention can be used with nearly any conventional anchor bolt to insure the correct placement and alignment of the anchor bolt and to promote a strong bond between the anchor bolt and the concrete. According to an embodiment of the present invention, the concrete anchor float generally comprises a base plate with a hole, and a cap extending from the base plate over the hole. The cap includes a cavity configured to releasably secure the anchor bolt, and a top against which the anchor bolt rests upon insertion. According to an implementation of the present invention, the base plate includes features that minimize voids and air pockets between the anchor bolt and the concrete to promote a strong bond.

Abstract: Brackets for interconnecting building components. One bracket embodiment is constructed to connect a pair of substantially perpendicular building components so as to allow relative vertical movement between those components and may include a first connector plate and a second connector plate. The first and second connector plates may be integrally connected at a right angle so as to form a right angled juncture. A plurality of stiffener channels may be disposed in the right angle juncture. The bracket may further include a plurality of substantially linear stiffener channels formed in the first connector plate. One or more elongated slots may be provided in the second connector plate. In another embodiment, one or more rows of holes are provided in the connector plate. The elongated slots or rows of holes may be located in one or more recessed stiffener regions. A score line and/or dimples may be provided in the first connector plate for locating fasteners.

Abstract: This invention is related to the construction industry. More specifically, it is related to a metal profile for the construction of support frames for doors and windows and providing a finished look to such doors and windows with an elegant touch. The advantages of this invention are that it allows for the work of preparing, leveling and installing support frames for doors and windows without affecting the finished look of the planes that include the fenestration, eliminating possible damages to the finish of the planes that include the fenestration. In case of maintenance or repair work, it is easily disassembled in a partial manner and reassembled in the same way, as well as to easily attach to it certain accessories that will make it versatile for its use on the fenestrations of doors, windows, and mid-height division walls.

Abstract: A blast resistant window structure capable of withstanding typical car bomb blast pressures of 100 psi or more and of resisting leakage of chemical or biological agents is described, the window structure including a frame hermetically enclosing two glass panels in confronting relationship defining an air gap therebetween, each glass panel having a thin layer of polymer film on each surface thereof, and a pressure relief valve in the frame for releasing air pressure from within the gap in response to blast pressure imposed on an outer surface of one of the panels.

Abstract: A system and an apparatus and method for detecting and discriminating articles that are within a predetermined range of a specification into lots. A counting head assembly includes at least an article detecting unit located above diverting gates which control the passage and/or accumulation of articles in adjacent channels to permit filling of article containers with predetermined article portions as containers are placed beneath, and removed from, the assembly outlet. A plurality of such assemblies may be combined to provide high speed continuous container filling operations, for example by location of a plurality of counting head assemblies about the periphery of a rotating carousel or on a linear platform which moves containers beneath the assemblies for simultaneous filling of groups of containers.

Abstract: A conveyor advances a web horizontally parallel to rows of upwardly open pockets formed in the web underneath a loader having a plurality of object-filled passages each having a downwardly open mouth open immediately above a respective one of the rows of pockets. As the sheet is advanced underneath the loader the objects drop out of the mouths into the pockets. Respective arms are pivotal on the loader downstream of the mouths at each of the rows about a horizontal transverse axis and have upwardly deflectable lower ends normally positioned immediately above the sheet. These lower arm ends are horizontally engageable with any of the objects projecting upwardly out of the respective pocket so that, as the sheet is advanced, the arm lower ends horizontally strikes any upwardly projecting objects and then pivots up while sliding the projecting object up out of the respective pocket.

Abstract: A de-packaging system for removing film and bands from packages includes a first conveyor configured to move packages. The de-packaging system also includes a loading station for loading packages onto the conveyor, and a film cutting station associated with the first conveyor. The film cutting station includes a cutter having an elongated cutting element that can be heated to cut film on packages. A band cutting station includes a cutter for cutting bands wrapped around packages. A clamp device includes a clamp configured to clamp bands on packages for removal of the bands. The de-packaging system further includes a second conveyor having an upstream end adjacent a downstream end of the first conveyor. A device applies force to packages to move packages from the first conveyor to the second conveyor, and at least one friction member strips film from packages as they are moved from the first conveyor to the second conveyor.

Abstract: Machine and method for making air-filled packing cushions from a roll of prefabricated film material having a longitudinally extending inflation channel near one edge of the material and chambers which communicate with the channel through laterally extending passageways. The roll rests on a pair of spaced apart, horizontally extending rollers. The film material is fed from the roll to an inflation tube which extends into the inflation channel, air is introduced into the chambers through the inflation tube to inflate the cushions, and a longitudinally extending seal is formed across the passageways between the channel and the chambers after the cushions are inflated.

Abstract: A system and process for packaging groups of products, such as spirally wound paper products are disclosed. During the packaging of groups, a continuous supply of a wrapping material is unwound and cut periodically in the edge regions. Optionally, a perforation line may also be formed into the wrapping material in between the two cut edges. The cut edges form flaps that are then wrapped around the product groups and sealed. The wrapping material is then broken along the perforation lines in order to form individual packages. Finally, the ends of the packages are folded and sealed.

Abstract: A method and device for folding an end portion of a substantially elliptical-section, tubular wrapping for a group of cigarettes, whereby the end portion of the tubular wrapping is folded by forming three first and three second folded flaps located on opposite sides of a major axis of the elliptical section of the tubular wrapping; the first and second flaps being defined respectively by a respective central flap and by two respective lateral flaps, each of the second flaps being specular with a corresponding first flap, and being located between the major axis of the elliptical section and a packing wheel supporting the tubular wrapping; the first flaps being folded first, commencing with the first central flap; and the second flaps being folded subsequently, commencing with the second lateral flaps.

Abstract: A combination sealing and cutting device comprising: an elongated anvil having an elongated slot therein; an elongated blade having a longitudinal aperture therein; a heating element in the longitudinal aperture; and an actuator mechanism for driving the blade toward and into the elongated slot to accomplish simultaneous sealing and cutting of overlying polymer films. According to various preferred embodiments, the combination sealing and cutting device further includes a pair of parallel flanges extending along both edges of the blade that serve to retain the blade; and film retaining beads along the longitudinal edges of the parallel flanges that serve to retain the plastic films being cut and sealed against the outer edges of the elongated slot.

Abstract: A convertible mower deck has a plurality of adjoining cutting chambers under a mower deck, each cutting chamber having a cutting blade mounted to the lower end of a vertical spindle. The deck includes openings between adjoining cutting chambers, a discharge opening from one of the cutting chambers, a blower mounted in a housing outside the discharge opening, and a protective cover between the discharge opening and the blower housing. Gates are mounted under the deck at the openings between adjoining cutting chambers and at the discharge opening. A control structure moves the gates to change the size of the openings. The gates may be in an open position for the grass clippings to be discharged or collected, a closed position for the grass clippings to be mulched, and one or more intermediate positions for some of the clippings to be discharged or collected, and the remainder to be mulched.

Abstract: A method of manufacturing a conductor assembly including the steps of winding and back twisting. The winding step includes winding an electrical conductor around a core material, the core material including at least one color differentiated portion, the core material having a longitudinal axis. The back twisting step includes back twisting the core material until the at least on color differentiated portion is in substantial alignment with the longitudinal axis.

Abstract: To provide a cable or the like protection and guide device, which can suppress the sliding contact noise by reliably limiting a linear position and a bending position exhibited during the movement of the cable or the like, and at the same time, which can reduce a setting space by suppressing the impact noise and wear of a connecting pin piece on a connecting pin hole even if the height size of the link body is decreased. A connecting pin piece 13, convexly provided on a link body 10, which forms a cable or the like protection and guide device, includes stopper surfaces 13a, 13a, which are parallel to the upper edge center portion and the lower edge center portion of the side plates 11 and are oppositely disposed across a bending center point O and a pair of front, and rear arc-shaped outer circumferential surfaces 13b, 13b, which are oppositely disposed across the bending center point O.