A side-open left-right-door arbitrary-opening structure of a refrigerator comprises four hinge shafts are fixedly connected at left and right sides of a refrigerator body in pairs respectively, left and right sides of upper and lower end faces of a refrigerator door are all provided with an opening neck, each hinge shaft is correspondingly placed in one opening neck, four hinge shaft stoppers are slidably arranged on the upper and lower end faces of the refrigerator door in pairs respectively, one spring is arranged between two hinge shaft stoppers in each pair, tail ends of the hinge shaft stoppers on the upper and lower end faces of the refrigerator door extend into the opening necks at the corresponding sides, and the hinge shafts at the corresponding sides are positioned in the opening necks.

A tensioner for a fenestration unit operator includes a base and a guide including a track, the track slidably receiving the base such that the base is restricted to sliding in a first direction with respect to the guide along a sliding axis and a second direction with respect to the guide along the sliding axis that is opposite to the first direction. The tensioner includes a pawl and a ratchet each being a part of one of the sled and the guide, respectively, the pawl being in biased engagement with the ratchet to permit sliding in the first direction and restrict sliding in the second direction, the pawl being configured to be manually disengaged from the ratchet to permit sliding in the second direction. The tensioner includes a pulley coupled to the sled such that the pulley is free to rotate about a rotational axis that is transverse to the sliding axis.

A tensioner for a fenestration unit operator includes a base and a guide including a track, the track slidably receiving the base such that the base is restricted to sliding in a first direction with respect to the guide along a sliding axis and a second direction with respect to the guide along the sliding axis that is opposite to the first direction. The tensioner includes a pawl and a ratchet each being a part of one of the sled and the guide, respectively, the pawl being in biased engagement with the ratchet to permit sliding in the first direction and restrict sliding in the second direction, the pawl being configured to be manually disengaged from the ratchet to permit sliding in the second direction. The tensioner includes a pulley coupled to the sled such that the pulley is free to rotate about a rotational axis that is transverse to the sliding axis.

A casement window operator includes a linear input mechanism configured to be mounted to a stationary frame of a casement window, a linear to rotary motion converter operably coupled to an output of the linear input mechanism, a gear reducer operably coupled to an output of the rotary motion converter, and a sash arm operably coupled to an output of the gear reducer to rotate in conjunction with the output of the gear reducer. The sash arm is configured to extend from the stationary frame of the casement window to a rotatable window sash of the casement window.

A casement window operator includes a linear input mechanism configured to be mounted to a stationary frame of a casement window, a linear to rotary motion converter operably coupled to an output of the linear input mechanism, a gear reducer operably coupled to an output of the rotary motion converter, and a sash arm operably coupled to an output of the gear reducer to rotate in conjunction with the output of the gear reducer. The sash arm is configured to extend from the stationary frame of the casement window to a rotatable window sash of the casement window.

A fenestration assembly includes an operator assembly having an escutcheon configured for coupling with the fenestration assembly. A handle linkage is coupled with the escutcheon and rotatable relative to the escutcheon. The handle linkage includes a handle arm rotatably coupled with the escutcheon and a handle knob rotatably coupled with the handle arm. An articulating joint is between the handle arm and the handle knob. The handle linkage is movable between stowed and operational configurations. In the stowed configuration the handle linkage is seated along the escutcheon, and the handle arm and the handle knob are aligned. In the operational configuration the handle linkage is unseated from the escutcheon, the handle knob and the handle arm are misaligned with the handle knob at an operating angle relative to the handle arm, and the handle linkage is configured to open and close a fenestration panel.

A fenestration assembly includes an operator assembly having an escutcheon configured for coupling with the fenestration assembly. A handle linkage is coupled with the escutcheon and rotatable relative to the escutcheon. The handle linkage includes a handle arm rotatably coupled with the escutcheon and a handle knob rotatably coupled with the handle arm. An articulating joint is between the handle arm and the handle knob. The handle linkage is movable between stowed and operational configurations. In the stowed configuration the handle linkage is seated along the escutcheon, and the handle arm and the handle knob are aligned. In the operational configuration the handle linkage is unseated from the escutcheon, the handle knob and the handle arm are misaligned with the handle knob at an operating angle relative to the handle arm, and the handle linkage is configured to open and close a fenestration panel.

A tensioner for a fenestration unit operator includes a base and a guide including a track, the track slidably receiving the base such that the base is restricted to sliding in a first direction with respect to the guide along a sliding axis and a second direction with respect to the guide along the sliding axis that is opposite to the first direction. The tensioner includes a pawl and a ratchet each being a part of one of the sled and the guide, respectively, the pawl being in biased engagement with the ratchet to permit sliding in the first direction and restrict sliding in the second direction, the pawl being configured to be manually disengaged from the ratchet to permit sliding in the second direction. The tensioner includes a pulley coupled to the sled such that the pulley is free to rotate about a rotational axis that is transverse to the sliding axis.

A tensioner for a fenestration unit operator includes a base and a guide including a track, the track slidably receiving the base such that the base is restricted to sliding in a first direction with respect to the guide along a sliding axis and a second direction with respect to the guide along the sliding axis that is opposite to the first direction. The tensioner includes a pawl and a ratchet each being a part of one of the sled and the guide, respectively, the pawl being in biased engagement with the ratchet to permit sliding in the first direction and restrict sliding in the second direction, the pawl being configured to be manually disengaged from the ratchet to permit sliding in the second direction. The tensioner includes a pulley coupled to the sled such that the pulley is free to rotate about a rotational axis that is transverse to the sliding axis.

An apparatus for setting a gap between a first electrode and a second electrode of a spark plug, encompassing at least a counter-brace, a gap plate, and a plunger, which are disposed along a longitudinal axis; the counter-brace being configured to brace the spark plug; the gap plate being disposed between the counter-brace and the plunger in the direction of the longitudinal axis; the gap plate being configured to be disposed between the first electrode and the second electrode; and the plunger being configured to apply a deformation force in the direction of the longitudinal axis onto the second electrode.