A jamb (from
French
French (french: français(e), link=no) may refer to:
* Something of, from, or related to France
** French language, which originated in France, and its various dialects and accents
** French people, a nation and ethnic group identified with Franc ...
''jambe'', "leg"), in
architecture
Architecture is the art and technique of designing and building, as distinguished from the skills associated with construction. It is both the process and the product of sketching, conceiving, planning, designing, and constructing building ...
, is the side-post or lining of a doorway or other aperture. The jambs of a window outside the frame are called “reveals.” Small shafts to doors and windows with caps and bases are known as “jamb-shafts”; when in the inside arris of the jamb of a window, they are sometimes called "scoinsons."
A doorjamb, door jamb (also sometimes doorpost) is the vertical portion of the door frame onto which a
door
A door is a hinged or otherwise movable barrier that allows ingress (entry) into and egress (exit) from an enclosure. The created opening in the wall is a ''doorway'' or ''portal''. A door's essential and primary purpose is to provide security b ...
is secured. The jamb bears the weight of the door through its
hinge
A hinge is a mechanical bearing that connects two solid objects, typically allowing only a limited angle of rotation between them. Two objects connected by an ideal hinge rotate relative to each other about a fixed axis of rotation: all other ...
s, and most types of door latches and
deadbolt
A dead bolt, deadbolt or dead lock is a locking mechanism distinct from a spring bolt lock because a deadbolt can only be opened by a key or handle. The more common spring bolt lock uses a spring to hold the bolt in place, allowing retraction b ...
s extend into a recess in the doorjamb when engaged, making the accuracy of the plumb (i.e. true vertical) and strength of the doorjambs vitally important to the overall operational durability and security of the door.
The word ''jamb'' is also used to describe a wing of a building, perhaps just in Scottish architecture. John Adam added a 'jamb' to the old
Leith Customs house
Leith (; gd, Lìte) is a port area in the north of the city of Edinburgh, Scotland, founded at the mouth of the Water of Leith. In 2021, it was ranked by ''Time Out'' as one of the top five neighbourhoods to live in the world.
The earliest ...
in the
Citadel of Leith
A citadel is the core fortified area of a town or city. It may be a castle, fortress, or fortified center. The term is a diminutive of "city", meaning "little city", because it is a smaller part of the city of which it is the defensive core.
In ...
in 1754–1755.
In
arches
An arch is a vertical curved structure that spans an elevated space and may or may not support the weight above it, or in case of a horizontal arch like an arch dam, the hydrostatic pressure against it.
Arches may be synonymous with vault ...
and
vaults, the soffit is the curved inner surface of the arch or vault located above the impost, as opposed to the outer surface called the arch or vault crest.
See also
*
Jamb statue
A jamb statue is a figure carved on the jambs of a doorway or window. These statues are often human figures-typically religious figures or secular or ecclesiastical leaders. Jambs are usually a part of a portal, accompanied by lintel and trumeau.
...
*
Post and lintel
In architecture, post and lintel (also called prop and lintel or a trabeated system) is a building system where strong horizontal elements are held up by strong vertical elements with large spaces between them. This is usually used to hold up ...
References
Doors
Locksmithing
Architectural elements
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