Abstract: A compact counterbalanced window operator includes a housing in which operating arms pivotally connected in the housing and slidingly and pivotally connected to a sash of the window are counterbalanced by a torsion spring. In one embodiment, connections between the torsion spring and the operating arms are adjustable in order to vary the counterbalancing force applied to the operating arms.

Abstract: A door closer having a slide rail linkage and capable of being essentially fully concealed upon installation in either a door panel or door frame, has a housing in which is mounted a closer shaft. The closer shaft has a first end projecting from the housing to be attached to the slide rail linkage, a cam for providing the closing movement of the door, and a second end which is mounted in a journal bearing disposed within the housing.

Abstract: A convertible mulching mowing deck is disclosed having an angled top profile with maximum height at a discharge hole plugged with a spring loaded plug, with the sidewall of the deck recessed outwards at the back edge of the discharge hole.

Abstract: A desk having a desk top that is movable with respect to a storage compartment under application of an external force through an open position, an intermediate position, and a closed position. A support member is provided to support the desk top as it moves through these positions. In particular, the support member is adapted so that upon the removal of the external force if the desk top is positioned between the intermediate and closed positions, the desk top will slowly move to its closed position.

Abstract: Tension produced force is applied to a pivotally mounted gate to cause the gate to reside in a generally horizontal spring balanced position to close the gate, and/or tension produced force is applied to the gate to cause the gate to reside in a generally vertical spring balanced position to open the gate.

Abstract: A cabin comprising a base structure, a wall structure and a roof structure, wherein the wall structure comprises two opposed side wall members which define two opposite side walls of the cabin and which each provide a pair of corners and a pair of return walls which define a part of front and rear walls of the cabin, the space between the rear return walls being closed by a rear wall member and the space between the front return walls being closable by a door.

Abstract: A manway is defined by a cylindrical portion of a vessel wall and is closed by a cover pivotally movable between open and closed positions by means of a hinge mechanism including external brackets on the cover and the wall portion interconnected by a hinge pin. The opposite ends of the hinge pin carry bushings, on which are respectively disposed two torsion springs. Each spring has a vessel wall end portion disposed parallel to the hinge pin, the vessel wall end portions being respectively received in the opposite ends of a coupling sleeve engageable with bearing surfaces on one of the brackets. The other ends of the two torsion springs are respectively disposed generally perpendicular to the hinge pin and are received slidably through eyebolts fixed to the cover bracket.

Abstract: A spring assembly of the kind having a coiled strip spring member (34) supported at one end on an arcuate drum portion (16) about which it is reverse wound and coiled at its other end about an abutment (20) further includes a base plate (10) mounting the drum portion (16) and a second base plate (18) mounting the abutment (20), the base plates (10) and (18) being interconnected by pins (32) attached to base plate (18) running in slots (26, 28) provided on base plate (10) so as to prevent relative movement of the base plates which would allow the spring to coil further about the abutment (20). The base plate (10) is provided with a cover (40) with which it forms a housing portion and the base plate (18) is provided with a cover (38) with which it forms a second housing portion. The assembly can be dropped on to support pins (14, 22) attached to respective halves (42, 44) of a hinge, e.g. of an automobile trunk or lid.

Abstract: A counterbalancing assembly and a non-vertically hinged door assembly incorporating the same include a first pair of torque rods directly connected between the door and a frame which produce a partial counterbalancing torque. A second pair of torque rods acting through cams produce an augmenting counterbalancing torque such that the sum of the partial and augmenting torques fully counterbalance the door throughout its arc of motion.

Abstract: According to the invention, a closure panel, such as a tailgate, is removably connected to a vehicle body for pivotal movement about a hinge axis. The panel may be removably lifted from the vehicle body when the panel is pivoted to a panel removal position. A torque rod counterbalance spring is carried by the panel and includes an elongated portion extending between a crank end anchored to the panel for pivotal movement therewith and a stationary end. A support device is anchored to the vehicle body and captures the stationary end of the torque rod to restrain its pivotal movement so that the torque rod is torsionally wound when the panel is pivoted away from the panel removal position to provide a counterbalance force for continuously urging the panel towards the panel removal position. The torque rod is completely unwound when the panel is pivoted to the panel removal position.

Abstract: A heavily insulated emergency smoke hatch door is equipped with an operating mechanism which is located external to a cooler and/or freezer. This external location of the operating mechanism provides for the accommodation of heavier weight doors without effecting the venting area or access to the interior of the cooler and/or freezer. A latching mechanism keeps the door in the closed position and may be equipped with an automatic release device which will release the door upon sensing of a fire for heat within the cooler and/or freezer. Once the hatch door is released, the operating mechanism is operable to open the door for venting and access.

Abstract: A sliding door closure system (10) for a sliding door assembly (100) including a door frame (101) enclosing a pair of sliding doors (102) wherein the system (10) comprises a telescoping housing unit (13) operatively associated with an internal spring biasing unit (14) wherein one end of the housing unit (13) is operatively associated with the door frame (101) and the other end of the housing unit is operatively associated with one of the sliding doors (102); and, further including tension adjustment means (15) for fictionally adjusting the closure speed of the housing unit (13).

Abstract: A door closer is shown, which is installed between a door and a door frame, in a balanced door. The door closer is installed in a header of the door frame, and includes an operative connection to a hinge shaft upon which upper and lower door support arms pivot. The operative connection includes a first gear mounted on a check shaft which engages a second gear mounted on the hinge shaft. The second gear preferably has a larger effective diameter than the first gear whereby the limited rotation of the hinge shaft results in a greater rotation of the check shaft to fully utilize the closer functions.

Abstract: A counterbalanced door assembly particularly suited for heavy-duty load bearing applications such as sidewalk access doors, and for precasting into concrete slabs, comprises a door, a frame surrounding the door, a hinge connecting the door to the frame for rotation about a first axis, a torque rod arm mounted to rotate about a second axis displaced from the first axis, and one or more torque rods. One end of the torque rod arm is connected to the torque rod to twist the torque rod as the torque rod arm rotates about the second axis thereby generating a counterbalance force. A force control mechanism, which may be a cam with a properly shaped cam surface or a link hinged at either end, receives the counterbalance force from the torque rod arm and applies it in a controlled direction over a controlled effective moment arm relative to the first axis to generate the desired counterbalance torque.

Abstract: A door control system for dishwashers having doors mounted for pivotal movement between a vertical closed position and a horizontal open position. Pivot brackets are provided on each side of the door to support the door for such pivotal movement. A counterbalancing spring is connected to the bracket to produce a resilient force urging the door toward the closed position. A damper is also connected to the bracket to control the rate of movement of the door so that the door slowly and gently approaches the open position. The system functions effectively without adjustment of the spring even when the weight of the door is changed by the addition of decorative panels to the outside of the door.

Abstract: A damper arrangement for a glove box of an automotive vehicle is mounted separately from the glove box compartment in a space between other components mounted in an instrument panel of the vehicle. A pulley is mounted separate from both the glove box damper and the glove box compartment. A wire connects the glove box damper to a movable member associating the glove box compartment with a glove box lid via the pulley.

Abstract: The present invention entails an attic stair insulating cover made of a strong, lightweight insulating material such as polyurethane having a first insulating section and a second insulating section that are attachable to form a main insulating section. The insulating cover includes hinge assemblies that mount the insulating cover at the attic stair opening for positioning the attic stair insulating cover between an open and closed position. Each hinge assembly includes a partially hollow hinge arm that is molded onto the insulating cover. A removable axis pin connects the hinge arm to a block mounted adjacent to the attic opening. The hinge assembly axis is horizontally spaced from the main insulating cover and is also vertically spaced above the attic floor. A gasket recess extends along a bottom edge of the insulating cover with a gasket fitted into the recess and extending therefrom.

Abstract: A device in which an auxiliary force is applied to a loading deck side plate of a truck to reduce the force required for opening and closing the side plate. A spring is provided on the underside of the loading deck to pull a rod substantially horizontally. A swing link is provided below a side end portion of the loading deck, and the tip of the swing link and an outer surface of the side plate are connected together through a connecting link in such a manner that the tip of the swing link points obliquely upward or downward when the side plate is closed or fully open, respectively. The tip of the rod and an intermediate portion of the swing link are connected together through an intermediate link.

Abstract: Method and apparatus for vertically lifting a main entry door in an aircraft in order to clear stop fittings and open outward. A hollow shaft having a counterbalance spring and piston therein, which shaft is mounted in a hinge arm and is rotated via a drive chain. The shaft functions to rotate the door by means of splines on the shaft. A door attachment fitting is secured to the top of the piston and slides on the splines during vertical movement of the door.

Abstract: A refrigerator door assembly is mounted on a stationary frame of a refrigeration unit and comprises a door frame integrally molded about a thermo-pane in sealing relationship therewith. The door frame is hingedly mounted on the stationary frame of the refrigeration unit by a pair of upper and lower hinge pins. A torsion bar, integrally molded within the door frame and secured to one of the hinge pins, functions to constantly apply a closing force on the door frame to move the door assembly into sealing contact with the stationary frame of the refrigeration unit.

Abstract: The biasing mechanism of a refrigerator includes a spring connected to provide biasing force in the desired directions at the appropriate degrees of door opening and an arm and roller arrangement which compliments the action of the spring. Within about 30 degrees or so of its closed position the door is biased toward its closed position. From about 30 degrees to about 90 degrees of door opening the biasing mechanism slightly biases the door toward its open position. At about 90 degrees the door is stable and beyond about 90 degrees the mechanism provides an addition stable position.

Abstract: An apparatus for opening and closing a top bin lid from below such that, when in the fully opened position, the lid will not extend above the plane of the opening. The apparatus utilizes an elongated lever arm pivotally mounted on the pivot axis of the bin lid. A flexible linkage, such as a chain extends from below, over the lever arm and is connected to a gravity biased latch system which holds the lid in the closed position until the chain is pulled from below. After the latch is released, further drawing of the chain will pivot the lid and arm about their common pivot axis until the arm is obstructed from further movement by the bin. Continued pulling of the chain will draw the lid toward the lever arm against spring pressure until the lid has been pivoted approximately 180.degree. from its closed position.

Abstract: A counterbalanced window operator includes a rotatable drive member operatively connected to the pivoting end of the window by means of an arm member (29). A spring (40) occupying a fixed orientation is operatively connected to the arm member (29) to counterbalance the torque transmitted from the window to the arm member (29). In a preferred embodiment, double scissors arm members (250a and 250b) include a pair of first arm members (251a and 251b) that define a first plane and a pair of second arm members (252a and 252b) that define a second plane at an oblique angle relative to the first plane when the window is in an open position.

Abstract: A door closing mechanism, preferably mounted on a counterbalanced door assembly, which provides a mechanical advantage to close the door and overcome the forces of friction, inertia and any counterbalancing forces. A slot plate with a curved control slot is mounted to the door. A control arm, pivotally mounted at one end to the door frame, has a handle and slot engager mounted at the other end. The slot engager slides along the control slot and pulls the door closed as the handle is pulled. The control slot is preferably curved only along a first portion and straight in a second portion to provide greater mechanical advantage at the beginning of its motion.

Abstract: A support device (10) for a hinged panel (12) mounted on a vehicle (14), the panel (12) being angularly displaceable between an opened position (16) and a closed position (20). The support device (10) comprises an elongate connecting member (22) pivotally connected to the panel (12) and an associated rotatable helical mating surface (24). A support arm (26) is pivotally connected to the vehicle (14). The support arm (26), including its own helical mating surface (28) is adapted to telescopingly receive the helical mating surface (24) of the elongate connecting member (22). A multi-coil torsional spring (30) may exert a torque between the respective helical mating surfaces (24, 28) when they are in contiguous relationship. As an operator swings the panel (12) open, the support device (10) extends, and the torsional spring (30) stores potential energy.

Abstract: A hinge assembly for mounting to a body structure of a vehicle a movable closure panel granting access to a compartment. A compact area in the compartment is defined by a partition dividing from the passenger compartment, a leading edge of the closure panel and a raised floor in the compartment. The hinge assembly has a bracket mounted to the body structure in the compact area of the compartment and projecting under the leading edge of the closure panel. The bracket has a pair of plates each having a guide slot. A hinge strap is interposed between the two plates of the bracket and has an end secured to the closure panel near the leading edge. A first guide roller is carried by the other end of the hinge strap and is slideably received by one of the guide slots for slideable movement of the other end of the hinge strap relative to the body structure.

Abstract: A device for controlling swinging doors utilizing an externally powered motor to compress a spring during door opening to store energy in the spring. The motor is not used to open the door, but only to compress the spring, thereby utilizing a minimum amount of electrical energy and allowing for a very easy opening of the door. The motor acts as a generator during the closing of the door with generated electrical energy fed back to the motor to retard rotation of the rotor, providing a brake on the closing movement of the door. The feedback circuitry includes a switch for varying the braking during the final degrees of closing movement as well as a variable setting device allowing control of braking force.

Abstract: The sash of a roof window is swung between closed and open positions in response to the extension and retraction of a pair of pivotally supported crossed arms which are adapted to be swung by an operating mechanism whose mechanical advantage increases as the sash moves from its closed position to its open position. The increasing mechanical advantage of the operating mechanism offsets the decreasing opening force exerted by counterbalance springs during opening of the sash and enables the sash to be opened through its entire range with relatively constant manual effort. The initial preload in the counterbalance springs may be selectively adjusted to compensate for the weight of a particular sash and the pitch of a particular roof.

Abstract: A counterbalanced door assembly particularly suited for heavy-duty load bearing applications such as sidewalk access doors, and for precasting into concrete slabs, comprises a door, a frame surrounding the door, a hinge connecting the door to the frame for rotation about a first axis, a torque rod arm mounted to rotate about a second axis displaced from the first axis, and one or more torque rods. One end of the torque rod arm is connected to the torque rod to twist the torque rod as the torque rod arm rotates about the second axis thereby generating a counterbalance force. A force control mechanism, which may be a cam with a properly shaped cam surface or a link hinged at either end, receives the counterbalance force from the torque rod arm and applies it in a controlled direction over a controlled effective moment arm relative to the first axis to generate the desired counterbalance torque.

Abstract: A fabric tenter device having a pivotally mounted roof which may carry a nozzle box is provided with a counterbalance assembly enabling the roof and box to be pivotally shifted from the tenter covering to an open position by manual lifting forces. The counterbalance assembly is comprised of a lever divided into two arms, the lever being pivotally mounted on a fulcrum fixed to the tenter housing. The lever includes a weight arm underlying the roof and a power arm to the opposite side of the fulcrum. A chain having one end fixed to the power arm has its other end attached to a spring mechanism carried by the weight arm, the chain being arranged over a guide roller or rollers in such manner that the spring is tensioned to its maximum extent when the roof is in the tenter covering position.

Abstract: A gate assembly for a vertically pivoting gate includes a support and coil springs connected between the gate and the support to bias the gate toward a vertical, open position, as well as from the open position back to a horizontal, closed position. The springs are attached to the support, and cables extend from the springs to the gate. Sheaves mounted on the support engage the cables to induce the return bias in the springs to move the gate back to the closed position. The mounting for the sheaves includes a member engaging the gate to support the gate in a precisely vertical orientation when the gate is in the open position.

Abstract: A counterbalanced operator for a pivoting unit includes a housing 17 and a rotatable drive member mounted in the housing. A first end 29a of arm member 29 is operatively connected to the drive member. A second end of the arm member is operatively connected to the pivoting end of the unit and a torque from the unit is transmitted to the arm member. A crank 33 rotates the drive member. A spring 40 provides for a means for counterbalancing the torque on the arm member. The spring 40 creates a force, the spring operatively connected to the arm member and the spring positioned in the housing. The force is transmitted from the spring to the arm member.

Abstract: A window, particularly designed to be installed in an inclined roof, comprises a top-hinged sash which via a lifting arm is connected with a slide shoe displaceable along a guidance of a lateral frame member. An intermediate member is provided with a transverse pin adapted to be connected with a pocket in the top side of the slide shoe, and the intermediate member is loaded or biased in a direction towards the lower end of the guidance by means of a spring. A spacer serves to hold the intermediate member ready for engagement. When the window has been installed in the roof, the appropriate pocket to be engaged by the transverse pin is selected with due regard to the roof inclination, i.e. the pocket resulting in a desired opening force acting on the sash, which is then swung open until the transverse pin engages the selected pocket, whereupon the sash is swung slightly in its closing direction to release the spacer for removal.

Abstract: The shutter opening device, particularly for pleasure craft hatchways, has a gas spring type pneumatic cylinder which actuates the closing and opening movements of the shutter of hatch. A control rod protrudes from the stem of the cylinder, and a pivoting lever acts upon the rod. A button is used to keep the lever in one of the two positions which either locks the stem in a secured position or permits the stem to freely slide.

Abstract: The invention relates to an improved balancing aid for a pivotally mounted cover for a manhole comprising means for hinging the cover relative to the manhole so the cover may be rotated about the hinge to expose and cover the manhole; and a spring retaining means comprising a rod pivotally secured to the cover, said rod being at least partially encased by a housing, said housing containing a compression spring means which is compressed when the cover is closed; wherein the improvement comprises securing the spring retaining means by attachment means which may be removed only after the spring means is first removed.

Abstract: A window or a door with a panel (1) mounted on a fixed frame (2) on or near an upright boundary edge by hinge fittings (5, 6). To relieve the hinge fittings (5, 6) of the vertical component of the force of weight or load of the panel (3), a brace (11) is provided, engaging with the panel (3) on the one hand in the area of the hinge fittings (5, 6) and on the other hand, anchored to the fixed frame (2) against the force of weight or direction of load of the panel (3). The brace is provided above, but adjacent to, a lower corner hinge.

Abstract: A hood tilt control mechanism includes a hood support brakcet having one hinge leaf attached to the chassis including a longitudinally extending slot for slidably receiving one end of a telescoping hood tilt assist mechanism and a second hinge leaf attached to the hood and providing a pivotal mount for the other end of the assist mechanism. The assist mechanism telescopes or extends respectively against the bias of opening or closing springs disposed adjacently on the assist mechanism so that when the hood is closed, the closing spring exerts a counterbalancing force on the hood to assist its opening. As the hood opens the closing spring force goes to zero and, as the hood moves to the open position, the opening spring is engaged by the mechanism to dampen the motion of the hood, ultimately stops the hood by interference of the spring coils, and counterbalances the hood weight in the open position to assist closing.

Abstract: Disclosed herein is a hinge assembly comprising a housing adapted to engage a toilet bowl and comprising an internal cavity including a bottom opening, and a cylindrical bearing surface having a horizontally extending axis, a hinge member supported by the bearing surface for rotation about the axis and including a hinge pin extending co-axially with the cylindrical portion and outwardly of the housing and adapted to be fixedly engaged with a toilet seat to effect toilet set rotation in common with rotation of the hinge member about the axis, an elongated actuating link extending into cavity in the housing through the bottom opening and including an upper end a lower stud portion having a lower threaded part, and an upper end connected to the hinge member for effecting rotation of the hinge member in response to link movement in the direction of link elongation, a nut adjustably threaded on the threaded lower part of the stud portion, and a helical spring located in encircling relation to the stud portion and

Abstract: A gate assembly for a motor driven vertically pivoting gate includes a support frame and coil springs attached between the gate and the support frame to bias the gate toward a vertical, open position and thereby assist the drive motor. A member secured to the support frame deflects the springs when the gate is in the open position, thereby placing the springs in tension so that the springs also assist the drive motor in starting the gate to move from its open position toward its closed position. The member also engages the gate when it is in its open position and supports the gate in a precisely vertical orientation.

Abstract: A fuel filler door structure is provided with such an arrangement that one end of a toggle spring is adapted to engage with the bracket for the mount of a fuel filler door complete, and the other end of the toggle spring is adapted to engage with the middle portion of a hinge rod extending in a crank-like shape in an offset relationship with a line passing the both ends of the crank shaped hinge rod. By the effect of the toggle spring, the fuel filler door complete may be urged continuously in either way of closing or opening across the dead point of urging effected by the toggle spring.

Abstract: A roof vent, sun roof or like system has a tiltable panel which is hingedly mounted in a frame around a roof opening of an automotive vehicle. The assmebly includes a rectilinear guide along which a slider is displaceable to straighten a bent spring bar connected to the panel and thereby allow the panel to be drawn into sealing closure with the frame.

Abstract: An arrangement for suspension of a door, preferably a luggage compartment door, on a vehicle body. Between the vehicle body and the door there are arranged separate first and second spring elements. The attachment points of the second spring element, during the first part of the pivoting movement of the door from a closed to an open position, exerts a torque in a direction counter to the pivoting movement and, during the continued pivoting movement of the door, exerts a torque in the direction of the pivoting movement.

Abstract: Footwardly directed air conduting apparatus mounted on an engine guard frame surrounding a cylinder head portion of a flat engine mounted in front of a step of a motorcycle. A cover is mounted on the engine guard and covers the cylinder head portion. At air guide plate is rotatably mounted in a window-like opening in the cover in such a manner that the forward end moves to the outside and the rearward end moves to the inside of the cover. An over-center spring mechanism is provided between the rearward end of the plate and the inside of the cover.

Abstract: A vending device for newspapers or other articles comprising a box like receptacle which can be pole or pedestal mounted. The device includes a one piece paper display member, an access door biasing means which is hidden from exposure to the weather, a door latch device which maintains the access door in an open position, a releasable lock device for locking a coin operating mechanism and coin box in the vending device and an access door locking unit for locking the access door to the coin operating mechanism.

Abstract: A ceiling access panel for a suspended ceiling has a friction brake to retard the pivotal movement of the panel from a raised condition flush with the ceiling to a lowered condition exposing a ceiling access opening. The friction brake comprises a flexible band having a first end anchored to the access panel, a second end fast to a bracket upstanding from the access panel, and an intermediate portion passing around and between a pair of rollers mounted on an access frame portion of the ceiling structure so that when the weight of the access panel is applied to the first end of the band, the band is drawn onto itself, frictionally to resist further lowering of the access panel.

Abstract: A hinge system for a large or heavy cover member hinged to a container member. A container hinge plate is secured to a side wall of the container member and a cover hinge plate is secured to the side wall of the cover member and rotatably connected to the first hinge means at a hinge pivot means. A gas strut unitary with and pivotably mounted to the container and cover hinge plates raises and lowers the cover member to open and closed positions relative to the container member. The gas strut is pivotably attached to the container and cover hinge plates. A quick connect-disconnect plate removably connected to the cover hinge plate and rotatably connected to the hinge pivot is used to connect or disconnect the container hinge plate from the cover hinge plate and thus to connect or disconnect the cover member to or from the container member and thus connect or disconnect the container member to or from the cover member. The hinge system including the quick connect-disconnect plate can be mounted to a heavy door.

Abstract: A counterbalancing assembly for use with a gate vertically rotatable about an axle carried by a support structure. The counterbalancing assembly utilizes a coil spring having one end attached to the support structure and having its other end attached to one end of a cable. The other end of the cable is attached to the gate at a point spaced apart from the axle. This cable, intermediate its ends, is trained around a pulley. The pulley is positioned so that as the gate is lifted, the spring provides a resilient force assisting in the opening of the gate and, as the center of gravity of the gate crosses over the axle and the gate starts to fall on the other side of the axle, the spring provides a force counteracting this falling movement. With this arrangement, the coil spring also assists in closing the gate from the open position.

Abstract: A torque rod operated counterbalancing hinge comprising first and second hinge members connected together at a hinge point, the second hinge member being curved with a cam surface to the first hinge member, and the other end rotatable relative to a pivot point located at a position displaced from the location of the hinge point. A lever arm has one end rotatably mounted at the pivot point and the other end has a bearing surface for contacting the cam surface. The rotating end of the torque rod is fixed relative to the lever arm whereby rotational hinge motion of the first hinge member relative to the second hinge member causes the cam surface to press upon the bearing surface through a moving contact point which rotates the lever arm to produce a counterbalancing twisting of the torque rod. The invention also includes a door assembly employing the counterbalancing hinges.

Abstract: A self-centering stock-proof gate comprises an elongate tubular member and an extension piece slideable within the tube, the extension piece carrying an embedded wire for communicating electric shock along the tubular member and along the extension piece. The tubular member is pivotally mounted about a vertical access on a hinge structure and is held in a central closed position by a pair of chain couplings which connect to a single spring lying along the tubular member and coupled thereto. Each of the chain couplings has an end link freely slideable along a pin which extends outwardly to a respective side of the tubular member from the hinge structure. Thus when the gate gets beyond a predetermined open angle, the chain slides along the pin towards the hinge structure thus reducing the mechanical advantage of the spring.

Abstract: A cover assembly for use with a base structure such as a hot tub comprising a cover member mounted for rotational movement to the base structure by mounting arms.The mounting arms are arranged relative to the cover member so that the cover member travels along a path from a covering positioning to an open position, this path having a first path portion extending between the covering position and an intermediate location area of the cover member, and a second path portion extending between the open position and the intermediate location area.The cover member is arranged relative to the mounting arms in a manner that with the cover member on a first side of the intermediate location area in the first path portion, gravitational force on the cover assembly tends to move the cover member to the covering position, and with the cover member on the second side of the intermediate location area in the second path portion, gravitational force on the cover assembly tends to move the cover member to the open position.