Four-way double door frame

A four-way double door frame for a pair of doors, one of which is fixed and the other swinging, wherein the swinging door may be either left- or right-handed and may be either in-swinging or out-swinging, comprising:

• a head jamb,
• a fixed-door jamb,
• a strike jamb for the swinging door,
• a sill, and
• a center mull, said jambs all having a door-rabbet portions adjacent one longitudinal edge and an unrabbeted portion adjacent the other longitudinal edge,
• said center mull having oppositely disposed door-rabbet portions on respectively opposite sides thereof adjacent one longitudinal edge and an unrabbeted portion adjacent the other longitudinal edge, and a plurality of hinge mortises symmetrically placed along the length of one rabbeted portion, and
• joint means at opposite ends of the fixed-door jamb, the strike jamb, and the center mull for joining either end thereof selectively to either the sill or the head jamb,
• said sill having an inclined tread surface adjacent a longitudinal edge thereof and a horizontal surface adjacent an opposite longitudinal edge, said joint means at the opposite ends of said fixed door jamb, said strike jamb, and said center mull including beveled end surface means for fitting against the inclined tread surface of the sill and horizontal end surface means for fitting against the horizontal tread surface of the sill and alternately against a horizontal lower surface of the head jamb.

A four-way double door frame for a pair of doors, one of which is fixed and the other swinging, wherein the swinging door may be either left- or right-handed and may be either in-swinging or out-swinging, comprising:

• a head jamb,
• a fixed-door jamb,
• a strike jamb for the swinging door,
• a sill, and
• a center mull, said jambs all having a door-rabbet portions adjacent one longitudinal edge and an unrabbeted portion adjacent the other longitudinal edge,
• said center mull having oppositely disposed door-rabbet portions on respectively opposite sides thereof adjacent one longitudinal edge and an unrabbeted portion adjacent the other longitudinal edge, and a plurality of hinge mortises symmetrically placed along the length of one rabbeted portion, and
• joint means at opposite ends of the fixed-door jamb, the strike jamb, and the center mull for joining either and thereof selectively to either the sill or the head jamb,
• said sill having an inclined tread surface adjacent a longitudinal edge thereof, said joint means at the opposite ends of said fixed door jamb, said strike jamb, and said center mull including beveled end surface means for fitting against the inclined tread surface of the sill,
• said sill having an upwardly open notch intermediate the end thereof, the joint means at opposite ends of said center mull including a tongue projecting lengthwise from each end thereof for engaging in the notch in the sill.

A four-way double door frame for a pair of doors, one of which is fixed and the other swinging, wherein the swinging door may be either left- or right-handed and may be either in-swinging or out-swinging, comprising,

• a head jamb,
• a fixed-door jamb,
• a strike jamb for the swinging door, and
• a sill having an upwardly open notch intermediate the ends thereof and inclined tread surface extending lengthwise thereof between the notch and one longitudinal edge thereof,
• said jambs all having a door rabbet portion adjacent one longitudinal edge thereof and an unrabbeted portion along the other longitudinal edge thereof and each of the fixed door and strike jambs having joint means at opposite ends for joining selectively to the sill or to the head jamb,
• a center mull having
• oppositely disposed door rabbet portions on respectively opposite sides adjacent one longitudinal edge thereof, and an unrabbeted portion adjacent the other longitudinal edge thereof, the center mull being relatively thin between the door rabbeted portions and relatively thick in the unrabbeted portion,
• a plurality of hinge mortises symmetrically spaced along the length of one door rabbeted portion,
• a beveled end surface at each end of the relatively thick portion adapted to fit against the inclined tread surface, and
• a tongue extending longitudinally beyond each end of the relatively thin portion adapted to engage in the notch in the sill, whereby either end of the center mull may be mounted on the sill with the hinge mortises disposed in either longitudinal direction of the sill for left- or right-hand orientation of the swinging door, or for either in-swing or out-swing of the swinging door.