Abstract: A cooking vessel is formed with one or more annular rings rising above a laminate structure that exposes at least one more thermally conductive material of a contrasting color. The raised rings reveal the nature of the thermally conductive material, yet protect it from scratches and abrasion during use, such as when the cooking vessel is resting on a stove top.

Abstract: A dual wall cooking vessel is formed by the impact or friction bonding of the an inner to an outer vessel wherein a laminate of aluminum and copper layers is disposed between the outer surface of the bottom of the inner vessel and the inner surface of the bottom of the outer vessel. The aluminum layers are arranged to surround the copper layer of the uppermost aluminum layer being the upper aluminum layer being thinner than the lower aluminum layer and having a slightly smaller diameter than the copper and aluminum layer. The appropriate dimensions of the aluminum layers and sequence of welding and bonding operation results in the co-extrusion of both aluminum layers into a portion of the adjacent sidewall formed by the gap between the walls of the inner and outer vessel.

Abstract: A container system for microwave oven cooking comprises a main body, a lid, and a cap disposed in a recess in the lid. The cap is movable upward and downward through a limited range in the recess depending on steam pressure, and grooves, formed in a side wall of the cap, or in a side wall of the recess, allow escape of steam when the cap is moved upward as a result of steam pressure. The lid is also allowed to move upward and downward relative to the main container body in response to steam pressure, and, when the lid is moved upward, an additional path for the escape of stem is provided at the location where the rims of the lid and main body meet each other.

Abstract: A handle for use with cookware that has a base and a lid defining a cooking chamber. The handle is pivotally mountable to cookware about a horizontal axis and moves between a lifting position and a stored position. The handle has a cam for raising an edge of the lid when the handle is pivoted towards the stored position. A catch can be provided for positioning and holding the handle relative to the cookware. The catch has an elastically resilient member having a detent for engaging a recess positioned with the handle and is released by force applied to the handle.

Abstract: A thermally insulated cooking pot consists of an outer pot and an inner pot. The inner pot is suspended within the outer pot by hanging from the top inner circumferential area of the outer pot with its own top outer circumferential area. The space between the inner and outer pots becomes an insulation cavity. The contact point between the two pots is sealed by a pliable packing ring with an L-shaped cross-section, thereby sealing the insulation cavity. This sealed insulation cavity provides excellent thermal insulation. The packing ring contains a plurality of protrusions on the surface that come into contact with the inner pot to prevent the packing ring from sticking to the inner pot. The gap formed between the packing ring protrusions and the inner pot prevents the inner pot from sticking to the packing ring.

Abstract: In one aspect, an electric cooker comprises a pan that may have a planar upper surface portion, and a lid configured such that condensation that collects on its inner surface drains outside the pan. In another aspect, a serpentine heating element may be mounted to the bottom of the pan along a course that reduces disparity in heating of the upper surface of the pan.

Abstract: A smolder pot capable of cooking food as heat source is removed. The smolder pot comprises a cooking pot. At least one heat accumulating disk is fixed to a center of a bottom of the cooking pot; the heat accumulating disk being retained with a gap from the bottom. When the bottom of the cooking pot is heat, the heat accumulating disk will be heated. Due to the gap between the heat accumulating disk and the bottom, no heat is transferred to the cooking pot directly. Thus the temperature of the heat accumulating disk is not effect by the heat dissipating of liquid in the cooking pot. Thereby the heat accumulating effect of the heat accumulating disk is helpful to the heating and temperature retaining of the cooking pot.

Abstract: Apparatus for shipping and preparing baked food products includes a receptacle containing the food product, a baking shield upstanding above the receptacle, and a shipping carton. To prepare for shipping, the baking shield is placed at the bottom of the receptacle and is configured for a nesting fit. The baking shield may have either a frustoconical sidewall or a concave trough-like sidewall.

Abstract: A thermoplastic bakeware article (i.e., an article formed to hold, contain or support food, while being heated in a microwave, conventional oven, convection oven, or the like) that is food-grade and resistant to dripping, stringing, and melting at high temperatures. The article has a composition comprising a partially crystalline polyester resin and a phenoxy resin. The composition is formulated so as to allow cross-linking between the polyester resin and the phenoxy resin at temperatures above about 400° F.

Abstract: Cookware having improved uniform heat transfer over the entire cross section thereof, the cookware formed from a multi-layered composite metal having a layer of titanium roll bonded at or near the core of the composite. The titanium layer is roll bonded to layers of aluminum which, in turn, is roll bonded to layers of stainless steel. The layer of stainless steel adjacent to the cooking range may be a ferritic stainless steel if induction-type heating is desired. The multi-layered composite is also suitable for making a sole plate for an iron. Both the cookware and sole plate may include a non-stick surface applied thereto.

Abstract: The present invention 10 discloses a marinating tray 12 with a plurality of vertically extending spikes 14 that allow for the placement of a meat product 16 or the like thereon to provide for an area where perforation and separation of cellular bonds may be accomplished. The present invention 10 has a plurality of spaced apart vertically extending spikes 14 and side walls 18 surrounding the periphery of the bottom tray 20 to allow for the containment of a marinade or seasoning therein and about the vertically extending spikes to produce an improved and penetrating marinating process. The present invention 10 also has a concave area 18 therein. In an alternate embodiment, the present invention 10 may take the shape of a chicken leg.

Abstract: An assembly for the cooking of food on the surface element burners of any range or stove consisting of a circumferential skeletal metal frame with handhold wherein the interior repository capacity formed by the skeletal frame therein serves as a receptacle area to a disposable aluminum foil cooking liner or pan of a corresponding size.

Abstract: A pan for baking a batter or dough to provide a baked good, such as muffins or cupcakes. The pan includes a raised perimeter wall that acts as a shield or baffle to provide consistent air flow over the batter or dough during baking. The resulting baked goods have improved baked properties. A preferred muffin pan is disclosed.

Abstract: An enamel cooking ware, of which the cooking ware's body consists of an inner coating layer, an outer coating layer, and the cooking ware's body; wherein, the cooking ware body is made of stainless steel, and a dense mass of small concaves with small sizes is formed on its surface. Both of the inner and outer coating layers are enamel layers; such enamel cooking ware, of which the thickness of cooking ware's body can be greatly reduced, the covering capability of the enamel-surface layer also can be enhanced greatly, and the weight can be lowered substantially.

Abstract: A steam kettle lid assembly includes an elongated arm movable between an up position and a down position. A steam kettle lid includes central portion non-rotatingly attached to the arm in a manner which permits floating movement of the lid for proper seating on a kettle opening, but which also prevents a condensate rim on a bottom portion of the lid from rotating out of its functional position.

Abstract: A baking tray for baking food on a stick or skewer includes a base and support with at least one aperture. The open end of a stick that has been inserted into a food product is inserted into an aperture. The food product remains elevated off the baking surface such that the food product does not sustain any burning and grease drains off.

Abstract: An anti-stick cookware is manufactured by a process including a step of spinning a metal plate made of an aluminum alloy to form a cookware body having a bottom portion, a side portion extending upward from the bottom portion, and an inner cooking surface defined by the bottom and side portions. The side portion of the cookware body has a thickness thinner than that of the bottom portion of the cookware body. The thickness of the bottom portion of the cookware is at least 2.5 mm, and the thickness of the side portion of the cookware is at least 1.8 mm. The thickness of the side portion is 30%-64% of that of the bottom portion.

Abstract: The invention relates to a coated food paperboard (1), to the manufacturing process and use of the same, and to products obtained thereof. The paperboard (1) comprises one or several fibre material layers (2), such as a three-layer structure consisting of a middle layer (4) of a mixture of sulphate pulp and CTMP and of sulphate pulp layers (5) on both sides of it, and of a polymeric coating (3) getting into contact with food, either on one side or on both sides of the paperboard. According to the invention, the coating (3) consists of an outer layer (6), the melting point of the polymer used in which is at least 230° C., and of an inner layer (7) placed against the fibre material layer (5); in this inner layer, a polymer with a melting point of at least 230° C. is blended with another adhesive polymer, the melting point of which is 130-185° C. Further, the inner layer (7) may be provided with mineral substance, such as calcium carbonate.

Abstract: A process for the manufacture of cooking vessels, in particular pots and/or pans and the like suitable for magnetic induction heating, is remarkably simple and comprises the steps of: providing a metallic semimanufactured vessel (A) of the cooking vessel, comprising a hollow (21) and a bottom portion (20); providing a plate member (1), in a metallic material of relatively high hardness, provided with a plurality of points (6a, 6b) projecting from a surface thereof (4) and forming an angle (&agr;) equal to or larger than 90° therewith; inducing, by compression or the plate member (1) at the bottom portion (20), the penetration of said points (6a, 6b) and the adhering of said surface (4) of said plate member (1) on said bottom portion (20).

Abstract: An adjustable cover has a variable outside diameter for fitting in pots and pans of variable sizes and also cover plates of variable sizes. The cover can be used for keeping food hot on plates, preventing splatter from pans when cooking and retaining moisture in the pan during cooking. The cover comprises a circular nonporous top member with a plurality of apertures adjacent to a peripheral rim of the top member, the apertures being evenly spaced apart in a ring concentric with the peripheral rim. Each of the apertures has a tongue projecting radially outwards therefrom. A plurality of nonporous substantially trapezoidal vanes extend down from the peripheral rim and are curved and circumferentially overlapping to form a dome like shape. Each of the vanes has a tab projecting upwards into one of the apertures and rests on the surface of the top member.

Abstract: A bakeware device including a vessel including a side wall and a base surface for holding an item to be baked. A rim is connected to the top of the side wall and extends away from the side wall in a plane essentially parallel to the base surface. The rim includes an extended portion having silicon nubs to serve as a handle for the bakeware device.

Abstract: A method of surface treating a cookware article formed of aluminum or aluminum alloy, comprises the steps of applying a first coating of porcelain enamel to the exterior of the article; subjecting the interior of the article to hard-anodizing; and applying a second coating of porcelain enamel over the first coating.

Abstract: A structurally reinforced, durable baking tray for use in high-volume industrial baking applications. The baking tray of the present invention includes a baking surface, the perimeter of which is encircled by a band of material that is partially rolled down and away from the baking surface to define the outer edge of the tray. At least one lengthwise support rib is formed in the baking surface and connects with the band of material at both ends of the baking tray. At least one widthwise support rib is also formed in the baking surface. This widthwise rib intersects the lengthwise support rib and connects with the band of material on both sides of said baking tray. The intersecting support ribs pass completely through the length and width of the baking tray and join with the band of material encircling the baking surface, thereby conferring structural stability, rigidity, and durability to the tray.

Abstract: This invention relates to a disposable foil roaster tent having at least three walls, two of which are side walls and a third of which is a top wall. The perimeter of the side and top walls preferably is formed into a rolled-over bead. The disposable roaster tent is preferably constructed to be used with a roasting pans that has a retaining means on the rim of the pan such as a bead or in the case of a disposable foil pan, a rolled-over bead on the perimeter of the pan so that the roaster tent can be easily held on or easily removed from the pan.

Abstract: A multi-functional lid for cookware having a rotatable disc element and a stationary disc element. The rotating disc element of the lid allows for access related cooking tasks to be performed without removing the lid. The segmented rotating disc element includes an opening that allows for access to the pot, a perforated opening which allows for the controlled release of heat, and a segment that has no openings which allows the lid to contain all heat and moisture under the lid.

Abstract: A vessel incorporating an improved article support surface for supporting an article, such as a food product, during processing (e.g., baking, thawing or freezing), has a surface for supporting a food product or another article and a pattern is formed or otherwise incorporated in the article supporting surface. The pattern incorporated into the support surface is comprised of a raised portion and a low portion or valley and combine to define or create a pocket underneath the supported article or food product in which air circulates or flows during processing. In a preferred embodiment various shapes of baking sheets incorporating a “pebble-grain pattern” is embossed on a metal sheet and the embossed metal sheet is then formed into the desired shape. The sheets are constructed of various aluminum alloys used in the food equipment industry including, but not limited to, 3003, 3004 or 5052 aluminum alloys.

Abstract: The present invention relates to a pot with a multi-layered bottom and a manufacturing process thereof. More specifically, the pot with a multi-layered bottom made of a stack of different materials is characterized by: an upper aluminum plate being fixed to the base bottom in contact with each other; a perforated plate being fixed to the lower side of the upper aluminum plate and having a plurality of hollow portions; a lower aluminum plate being fixed to the lower side of the perforated plate; a stainless steel plate being fixed to the lower side of the lower aluminum plate and being magnetic; and the corresponding portions of the upper and lower aluminum plates are inserted into the hollow portions of the perforated plate by pressure and thus are interconnected in the hollow portions.

Abstract: This invention relates to an interchangeable disposable pan/cover having a continuous wall and a rim surrounding the pan/cover. The wall is preferably inclined and the rim is divided into two substantially equal first rim and second rim sections. The first rim section has a rolled-over bead formed at the outer end thereof. The end of the second rim section has a bead accommodating indent. The bead accommodating indent is sized so that when the bead of the first rim section rests in the bead accommodation indent, the lower surface of the first rim section abuts the upper surface of the second rim section. To have a pair of the interchangeable disposable pan/covers easily joined, each pan/cover has an orientation and closing flange extending upwardly from the outer end of the second rim section and extending substantially perpendicular to the base wall.

Abstract: A method for assembling a rigid industrial food-cooking container is disclosed wherein metal sheets respective recesses and projecting elements are first assembled and then shaped to a specific predetermined geometry for receiving the industrial food and the sheets temporarily connected and assembled at right angles, and welded or brazed to cover the entire contact surface between the sheets to provide a leak proof container for the industrial cooking of the food.

Abstract: A combination fluid collection container and drive-up service point in a traffic lane. The fluid collection container for retention of leaked automobile fluids is thermally bonded to the traffic lane surface adjacent to a drive up service point. The shallow, rectangular basin is formed of a thermoplastic material which is impervious to automotive fuels and lubricants, and resistant to wear and degradation by the environment. The container is formed of multiple thermoplastic components which are assembled during installation on the traffic lane surface. These components include a base sheet which provides the bottom surface of the container, side walls, and end walls. The outer edges of the end walls may be tapered during installation to remove any abrupt discontinuities in the traffic lane surface. The leaked fluids are retained within the container until removed in compliance with local laws and codes.

Abstract: A chafing dish with utility handles connected to the chafing dish at such an angle as to permit a lid to be placed on top of the chafing dish and allow a safe, efficient, and balanced grip to be had to lift and exchange or serve food in a chafing dish assembly.

Abstract: A process for the manufacture of cooking vessels, in particular pots and/or pans in a relatively soft metallic material, with a plate in a metallic material of high hardness applied to the bottom of the vessel, performs a stable connection among said parts with no mechanical and/or thermal trauma for the materials and comprises the steps of: providing a plate (1) provided with a plurality of points (6) projecting from a surface (4) thereof; inducing, by compression, the penetration of said points (6) and the adhering of said surface (4) at the bottom (20); and stretching said bottom (20), thereby causing the deformation and the clutching of said points (6).

Abstract: A baking dish includes a generally shallow platter made of ceramic material suitable to withstand a baking environment and having a baking surface defining a supporting plane on which a baked product can be made. A substantially upright continuous wall in the form of a ring generally conforming to the shape of the baking surface is provided that has a height dimension when supported on the baking surfaces relative to the supporting plane to define a generally cylindrical space for receiving and containing a food product to be baked. The platter and ring have substantially conforming peripheries. A laterally extending bead or a protuberance extends about the periphery of the platter and a deformable engaging member in the form a peripheral lip is provided about the periphery of the ring for removably attaching the ring to the platter about the periphery and for providing a generally sealed connection at the mating surfaces of the platter and wall of the ring.

Abstract: A hot-air lid (1) for containers (2) used for cooking and frying is proposed. In order to provide advantageous construction conditions it is proposed that it consists of an upper part (3) and a lower part (4) which can be fixed in said upper part and which together with the upper part (3) forms a cooking chamber (5), with the lower part (4) having an upwardly oriented curved part (6) with steam outlet openings (7) and with a reflector (8) being provided around said curved part (6) in which further through openings (9) are located.

Abstract: Disclosed is a heat-keeping cover for a cooking including a transparent window comprising a pair of glass discs so as to leave an interval or space in between, a metal rim coupled with an edge of the transparent window, and a over handle coupled with a center of the transparent window, herein the heat-keeping cover is for applying predetermined pressure and heat to the pot and reducing heat dissipation from the pot. The metal rim comprises dual stainless steel plates having an airtight inner space inside. The airtight inner space is filled with a heat medium for heat-keeping. The cover handle includes a metal sensor installed at a hole formed at a center of the transparent window so as to sense a temperature under the cover through the hole and a knob coupled with the metal sensor so as to play a role of a thermometer protruding out of the transparent window.

Abstract: The present invention is an apparatus for controlling pressure of an air pocket of a double-layered cooking vessel, which prevents the distortion or explosion of the double-layered cooking vessel that may result from high pressures generated within the air pocket by the heating of liquid and moisture trapped within the air pocket. In a double-layered cooking vessel having an air pocket between inner and outer shells, the present invention includes an exhaust port located on the outer shell, a handle covering the exhaust port, and exhaust means located within the handle to allow the discharge of vapor steam from the air pocket and through an exhaust port. The exhaust means for controlling pressure inside the air pocket is performed by opening and closing the exhaust port.

Abstract: A frying pan, which has a double-sealed structure and is designed for controlling internal pressure and moisture, has first and second containers, which are combined each other at one ends and have a handle mounted at the other ends, and also includes a concave groove formed on a contact surface of any of the first and second containers, and a packing mounted in the concave groove.

Abstract: The present invention relates to a pot with a multi-layered bottom and a manufacturing process thereof. More specifically, the pot with a multi-layered bottom made of a stack of different materials is characterized by: an upper aluminum plate being fixed to the base bottom in contact with each other; a perforated plate being fixed to the lower side of the upper aluminum plate and having a plurality of hollow portions; a lower aluminum plate being fixed to the lower side of the perforated plate; a stainless steel plate being fixed to the lower side of the lower aluminum plate and being magnetic; and the corresponding portions of the upper and lower aluminum plates are inserted into the hollow portions of the perforated plate by pressure and thus are interconnected in the hollow portions.

Abstract: A steam table pan made of ceramic is disclosed. The pan is generally rectangular, having a lower flange along one length of the rectangle, and an upper flange along the opposite length. When two such pans are placed side by side, the lower flange of the first pan fits snuggly in an interlocking position with the upper flange of the second pan. In this manner several such ceramic pans may be positioned side by side on a steam table or a similar serving bar.

Abstract: An apparatus and method of processing a product, such as food product, are disclosed. Untreated product is placed inside a bottom-unloading basket that is, in turn, placed within a covered vessel. For processing a food product, a porous steamer apparatus is provided for insertion into a covered cooking vessel. The steamer apparatus is comprised of two unfastened pieces, a basket and a support base, each of which has a plurality of small holes through which steam, but not food product, may pass. The basket holds the food product, is roughly cylindrical in shape, has an open-ended top and an open-ended bottom, and rests firmly upon, but is not fastened to, the support base during the steam-cooking process. The support base has an inverted conical shape and a vertical pole that has a hook-shaped upper terminus and that is integrally-connected to and protruding above and below the uppermost point of the support base.

Abstract: A baking pan system is disclosed comprising an outer frame and an attached baking sheet. The outer frame comprises two side walls and two end portions. Each end portion connects corresponding ends of the side walls, and each end portion forms at least one fastening aperture. The baking sheet includes a plurality of extruded portions. Each extruded portion aligns with and pierces a corresponding fastening aperture of the outer frame. Each extruded portion further curls around the outer frame. Methods for fastening a baking sheet to an outer frame and unfastening a baking sheet from an outer frame are also disclosed.

Abstract: A steam table pan made of ceramic is disclosed. The pan is generally rectangular, having a lower flange along one length of the rectangle, and an upper flange along the opposite length. When two such pans are placed side by side, the lower flange of the first pan fits snuggly in an interlocking position with the upper flange of the second pan. In this manner several such ceramic pans may be positioned side by side on a steam table or a similar serving bar.

Abstract: A steam pressure cooker includes a pot having an outwardly directed horizontal pouring rim and formed with a V-shaped circumferential depression which points inwardly to define a conical surface in an upper rim area. A lid can be placed upon the pot for closing and includes a circumferential groove. Positioned between pot and lid is a rubberized elastic sealing element which is held in the circumferential groove. The sealing element has a sealing body of substantially U-shaped configuration to define two sealing lips in coaxial parallel relationship to the vertical pot axis. One sealing lip bears against an inner wall of the pot and interacts with the conical surface of the pot, when the lid is placed upon the pot. A locking mechanism embraces and thereby clamps the lid and the pouring rim, when the steam pressure cooker is closed, and clears the pouring rim, when the steam pressure cooker is opened.

Abstract: A device for coupling a lid to pot, which includes two clip plates for clipping a portion where a lid body and a pressure pot are engaged with each other, a handle body for accommodating a part of the clip plates thereinside, tension springs each being fixed to the handle body on one end thereof and to the clip plates on the other end thereof to constantly pull the clip plates to a second direction, namely, a central direction of the lid body, a grip lever being set to a first position to release the sealed lid body and pressure pot by being moved due to an external force by as far as a predetermined distance and thus pushing the clip plates to a first direction, namely, a peripheral direction of the lid body, and a push button for pushing the grip lever to a second position to seal the lid body and the pressure pot by moving the grip lever and forcing the clip plates to be moved to a second direction due to a force of the tension spring.

Abstract: A steam pressure cooker, includes a pot with a horizontal pouring rim, a lid for closing the pot, and an elastic seal positioned between the lid and the pot. At least two moveable clamps are arranged peripherally in even spaced-apart relationship, for clamping the lid and the pouring rim, when the steam pressure cooker is closed, and clearing the pouring rim, when the steam pressure cooker is opened. The clamps and the lid are covered by a cap which supports a handle comprised of two handle parts, which are respectively connected to the cap and the lid. Actuation of the handle effects a coaxial rotation of the cap relative to the lid between two end positions, whereby in one end position the clamps are moved outwards, until the pouring rim is cleared. A tip clamping mechanism secures the cap relative to the lid in the end positions.

Abstract: Composites of paper and bioriented polyester plastic film are made by passing a web of paperboard and a web of plastic film, with a layer of extruded molten polymer impregnating and bonding agent between the webs, through a nip. The process involves controlling one or more of the speed of the webs, the temperature of the molten polymer, the pressure or spacing of the rolls at the nip, and the rate of extrusion, relative to the porosity and surface characteristics of the paper web such that a portion of the molten polymer impregnates partially into and becomes part of the paper web and a substantial portion lies outwardly of the surface of the paper web and solidifies to form a new surface to which the film is bonded and which it is supported clear of the paper surface. The molten polymer may be polyethylene or an ethylene acrylic acid copolymer. These composites are useful in forming corrugated structures which may be used for baking in convection ovens.

Abstract: An apparatus for boiling a liquid includes an audible alarm for notifying an individual when the liquid is boiling. The audible alarm makes use of steam generated by the boiling liquid to drive a turbine which is connected to a means for ringing a bell to notify an individual that the liquid is boiling.

Abstract: Plastic trays used for baking shrink when in an oven such that lids which attached to the tray prior to baking no longer fit the tray after baking. Since the shrinkage of the tray is known for the temperature range expected during baking, a lid having two sets of locking tabs at different perimeters can be used to secure the lid to the tray. The first perimeter and locking tabs are used before the tray is baked and the second perimeter and locking tabs used after the tray baked. In this manner a tray with food therein can have a lid secured thereto before baking when the tray is one size and the same lid secured thereto after baking. The lid is removed during baking and reapplied after baking thus protecting the food in the tray before and after baking. Alternatively the tray may have two lid engaging perimeters for attaching the trays to the lids. The first tray perimeter used before baking and the second after baking. The lid would have one perimeter for engaging the tray before and after baking.

Abstract: A cooking container has an outer shell, an inner shell disposed inside the outer shell forming a cylindrical wall space between the outer and inner shells. The wall space is formed between the outer and inner shells stantially along the height of the inner shell by curling the flanges of the inner and the outer shells at least four times. The cooking container also has a first heat conductive plate being in contact with an inner bottom surface of the outer shell and an outer bottom surface of the inner shell to allow even distribution of heat through out the bottom surface of the inner shell. A'second heat conduction plate is affixed to and in contact with an outer bottom surface of the outer shell. The wall space between the outer and inner shells contains ambient air.

Abstract: A bottom structure for cookware is disclosed. The bottom structure comprises a main plate, an aluminum plate and a cover. The main plate is provided at the peripheral portion of its top surface with a circular groove for holding the lower end of a main body and the peripheral edge of the cover, with the central portion of the main plate being dented. The aluminum plate is disposed in the dented central portion of the main plate. The cover is bent downwardly at its peripheral edge and is positioned on the aluminum plate with its downwardly bent portion inserted into the circular groove of the main body.