The present tense includes the future; the singular number includes
the plural, and the plural, the singular; the word "occupy" includes the words
"designed or intended to be occupied"; and the word "shall" is always mandatory.
Unless otherwise expressly stated, the following words and phrases shall
be construed throughout this chapter to have the meanings indicated:
Any opening in the exterior of a building or structure, as well as
places of ingress and egress.
As applied to a material, mode of construction, piece of equipment
or device, means approved by the enforcing authority as meeting the requirements
of this chapter.
Glazing material which is transparent or translucent, such as tempered
glass, laminated glass or wire glass, meeting the specifications of the United
States of America Standards Institute 297.1-1966, entitled "USA Standard Performance
Specifications and Methods of Test Transparent Safety Glazing Material Used
in Buildings," dated 1966, or Underwriters Laboratories Burglary Resisting
Glazing Material as listed under Underwriters' Laboratories No. UL-972--1972.
A lock front which consists of two plates: the under plate, which
is fastened to the case, and the finish plate, which is fastened to the under
plate and, when in place and fastened, covers the cylinder set screws, thus
protecting them from tampering (used on mortise locks).
Metal strips whose purpose is to cover or close the gap between the
edges of a pair of doors.
The horizontal distance from the face of the lock to the center line
of the knob, keyhole or cylinder.
A strike which also provides a complete housing to protect the bolt
opening.
A building or structure, or part thereof, which is used for the transaction
of business, for the rendering of professional services or for display and
sales purposes involving stocks of goods, wares or merchandise incidental
to such purposes and accessible to the public, including, among others, retail
stores, shops, salesrooms and markets.
A device used on a pair of doors to ensure that the inactive leaf
is permitted to close before the active leaf.
A building that, in the discretion of the enforcing authority, presents
a potential source of criminal activity.
A hardened free-turning ring encircling the exposed portion of the
cylinder to prevent cutting, drilling, prying, pulling or wrenching with common
tools.
A locking device that incorporates the key-in-knob principle. These
locks shall be lockable on the inside by a push button or a thumb turn (in
the knob), and are able to be unlocked by a key from the outside. Turning
the inside knob retracts the latch bolt, allowing egress from the building.
Latch bolts must have a minimum throw of 1/2 inch and shall be provided with
a deadlocking or guarded latch feature. All locksets shall be provided with
a wrought box strike. Knobs shall be able to withstand 300 pound-inches of
torque without being twisted off. The deadlocking latch bolt shall be able
to withstand 450 pounds of force without being depressed.
An electronic combination pushbutton device which remotely unlocks
the door when the proper combinations of buttons are pressed.
A lock bolt having no spring action or bevel, and which is operated
by a key or a turn piece.
A spring-loaded latch which is positively held in a locked position
by means of an integral slide trigger mechanism when the door is closed. It
is operated by a key from the outside and a push or thumb turn from the inside.
A lock equipped with a dead bolt only. All deadlocks must have a
minimum throw of one inch and must be equipped with case-hardened steel inserts
to prevent cutting. A wrought box strike must be used.
A movable structure for opening or closing an entrance to a building
or room. It may swing on hinges, slide in a groove or revolve on an axis.
An optical device consisting of a system of lenses, encased for convenient
installation in a solid door, permitting the inside viewer to observe a one-hundred-seventy-five-degree
area of the outside with the door closed. It must be nationally listed to
resist fire.
A locking device with a dead bolt that is positively held fast when
in the projected position, with a minimum throw of one inch, operated by a
cylinder from both sides, and shall be supplied with a wrought box strike.
An electrical device that permits the unlocking of a door from a
remote location or by remote means such as a card reader or cypher lock.
The Building and Planning Department, the Police Department and the
Fire Department of the Township of Lower Merion, which are hereby authorized
to enforce the provisions of this chapter.
[Amended 1-19-2002 by Ord. No. 3629]
A term used to describe the electronically measured flux emitted
by a light source.
A door containing approved glazing material in any quantity which
is transparent or translucent.
A covering lid or trapdoor in the roof of a building, designed for
purposes of access to the roof area of the building.
A hardened steel roller, laminated or fixed core, running the length
of a bolt to prevent cutting with a common tool.
A window or opening furnished with a series of sloping, slanted or
movable slats, arranged so as to admit light or air. These slats may be fixed
or movable. "Glass louvered" is a description of jalousies.
A beveled spring bolt usually operated by a knob, handle or thumb
turn that automatically holds the swinging door closed by engaging a strike.
A metal handle or lever, turned by hand, which operates the mechanism
of a locking device.
A lock designed to be cut into the edge of the door, not applied
to the surface, that operates with a cylinder outside and knobs, handles or
levers both inside and outside. It can be locked or unlocked by the outside
cylinder, push buttons in the edge of the lock faceplate, or by a thumb turn
on the inside of the door. The mortise lock shall always be operable by the
inside knob, handle or lever and shall have a wrought box strike and a cylinder
guard.
A building or structure, or part thereof, in which more than two
families or households live, or in which sleeping accommodations are provided
for more than two families or households.
A system of lever operated bolts which engage a door opening in at
least two points. Bolts may be operated by a turn handle or lever on the inside
and by a key on the outside.
A strike that is open in the back for use with a mortise lockset
or a mortise panic device when used in conjunction with a vertical rod panic
device on a pair of doors. The open-back strike allows either door to be opened
independently of the other door.
A door-locking device designed to allow instant exit by pushing on
a crossbar (that extends at least 2/3 of the way across the door) that releases
the locking bolt or the latch.
A locking device with a bolt, not spring-loaded, the bolt of which
swings on a pivot pin and is of the hooked or straight construction. It is
used on narrow stile doors. It is operated by a keyed cylinder on the outside
and a cylinder or thumb turn on the inside.
A building or structure, or part thereof, in which not more than
two families or households live.
Carriage bolts or nonreversible screws designed to prevent removal.
A hinged metal fastening for a door, window or hatchway; a metal
piece fitted over a staple and fastened by a padlock constructed with a case-hardened
staple and locking bar so that the mounting screws or bolts are concealed
when the hasp in closed.
A device on which a door, gate, window, hatchway or lid swings, and
constructed with nonremovable pins. If the mounting screws or bolts are accessible
from the exterior of the structure, they shall be attached with security screws
or bolts.
A locking device for use as an entrance lockset on a residential
or multiple-dwelling unit. It shall be constructed with a minimum throw of
1/2 inch on the latch-set and a minimum throw of one inch on the dead bolt.
When the inside latch-set knob is turned, the dead bolt will retract for immediate
egress.
A padlock constructed of a one-piece hardened steel, forged brass
or laminated case with a hardened steel shackle with heel-and-toe locking
and a cylinder containing five or more paracentric pin tumblers.
A heavy-gauge strike with at least four off-center screws 1 1/2
inches long, permitting full penetration through the jamb into the rough buck
or the reinforcing area of the strike on a metal door.
A device combining both spring and hydraulics to control the closing
and latching of a door, and which is listed by Underwriters' Laboratories,
Inc.
A door consisting of one or more movable sections sliding on guide
tracks in a horizontal direction. If it is of aluminum construction, it must
comply with Architectural Aluminum Manufacturers Association (AAMA) 1303.4--1973.
If it is of wood construction, it must comply with N.W.M.A. industry standard
I.S. 2-71.
An aluminum bar, permanently mounted on the inside of an aluminum
sliding door, which is designed to swing down into a bracket to prevent opening
the door when closed.
A window consisting of one or more movable sections sliding on guide
tracks in a horizontal direction. If it is of aluminum construction, it must
comply with Architectural Aluminum Manufacturers Association (AAMA) 1302.4--1973.
If it is of wood construction, it must comply with N.W.M.A. industry standard
I.S. 2-73.
A metal door having no glazed panels. It may be steel reinforced
core, honeycomb core or composition core with a minimum thickness of 1 3/8
inches and an eighteen-gauge, minimum, steel skin.
A metal covered wood door having no glazed panels with a minimum
thickness of 1 3/4 inches.
A flush solid core or paneled wood door containing no glazed panels.
It must be a minimum thickness of 1 3/4 inches, with panels which are
a minimum thickness of 1/2 inch.
Any substantial structural alteration in or addition to the supporting
or structural members of a building, such as bearing walls, bearing columns,
bearing beams or bearing girders, provided that a substantial alteration shall
not include, inter alia, repairs to roof, walls or interior; exterior or interior
painting or redecoration; elimination, moving or construction of new partitions
within an existing building; air conditioning; repair or replacement of heating
systems; modernization of kitchens or bathrooms, including moving or replacement
of utility lines (gas, water, sewer and electric); and installation or replacement
of kitchen or bathroom equipment. A structural alteration not increasing the
square footage of a building more than 20% shall not be considered a substantial
alteration.
A steel cover protecting the strike and locking device on doors swinging
out to the exterior of the building. The tamper guard shall extend at least
six inches above and below the center line of the strike or bolt. The tamper
guard shall be at least 1/8 inch thick and shall be fastened from the inside
of the door with through bolts or by security bolts.
The length of travel the portion of a dead bolt or latch is exposed
from its recess in the lock case.
A metal device used to operate the mechanism of a locking device,
normally requiring only the pressure of the thumb and index finger.
A lockset that has all the parts assembled as a unit at the factory
and, when installed in a rectangular notch cut into the door, requires little
or no disassembly. Knobs shall be able to withstand 300 pound-inches of torque
without being twisted off. The deadlocking latch bolt shall be able to withstand
450 pounds of force without being depressed. All locksets shall have wrought
box strikes and a deadlocking or guarded latch feature.
