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Dead Bolt
A deadbolt or deadlock is a type of lock morticed into a wooden door where a bolt is thrown into the door frame, using a key from either side, to secure the door. It is 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 by applying force to the bolt itself. A deadbolt can therefore make a door more resistant to entry without the correct key, as well as make the door more resistant to forced entry. A deadbolt is often used to complement a spring-bolt lock on an entry door to a building. Common types A deadlock, if it is cylinder operated, may be either single cylinder or double cylinder. A single cylinder deadlock will accept a key on one side of the lock, but is operated by a twist knob on the other side. Double cylinder locks will accept a key on both sides and therefore do not require (and often do not have) any twist knob. This prevents un ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Two Holes No Waiting
2 (two) is a number, numeral and digit. It is the natural number following 1 and preceding 3. It is the smallest and the only even prime number. Because it forms the basis of a duality, it has religious and spiritual significance in many cultures. Mathematics The number 2 is the second natural number after 1. Each natural number, including 2, is constructed by succession, that is, by adding 1 to the previous natural number. 2 is the smallest and the only even prime number, and the first Ramanujan prime. It is also the first superior highly composite number, and the first colossally abundant number. An integer is determined to be even if it is divisible by two. When written in base 10, all multiples of 2 will end in 0, 2, 4, 6, or 8; more generally, in any even base, even numbers will end with an even digit. A digon is a polygon with two sides (or edges) and two vertices. Two distinct points in a plane are always sufficient to define a unique line in a nontrivi ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spring Bolt Lock
A latch or catch (called sneck in Northern England and Scotland) is a type of mechanical fastener that joins two or more objects or surfaces while allowing for their regular separation. A latch typically engages another piece of hardware on the other mounting surface. Depending upon the type and design of the latch, this engaged bit of hardware may be known as a ''keeper'' or ''strike''. A latch is not the same as the locking mechanism of a door or window, although often they are found together in the same product. Latches range in complexity from flexible one-piece flat springs of metal or plastic, such as are used to keep blow molded plastic power tool cases closed, to multi-point cammed latches used to keep large doors closed. Common types Deadbolt latch A deadbolt latch is a single-throw bolt. The bolt can be engaged in its strike plate only after the door is closed. The locking mechanism typically prevents the bolt from being retracted by force. Spring latches * A ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Spring (device)
A spring is a device consisting of an Elasticity (physics), elastic but largely rigid material (typically metal) bent or molded into a form (especially a coil) that can return into shape after being compressed or extended. Springs can Energy storage, store energy when compressed. In everyday use, the term most often refers to coil springs, but there are many different spring designs. Modern springs are typically manufactured from spring steel. An example of a non-metallic spring is the Bow (weapon), bow, made traditionally of flexible Taxus baccata, yew wood, which when Bow draw, drawn stores energy to propel an arrow. When a conventional spring, without stiffness variability features, is compressed or stretched from its resting position, it exerts an opposing force approximately proportional to its change in length (this approximation breaks down for larger deflections). The ''rate'' or ''spring constant'' of a spring is the change in the force it exerts, divided by the cha ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Key (lock)
A lock is a mechanical or electronic fastening device that is released by a physical object (such as a key, keycard, fingerprint, RFID card, security token or coin), by supplying secret information (such as a number or letter permutation or password), by a combination thereof, or it may only be able to be opened from one side, such as a door chain. A key is a device that is used to operate a lock (to lock or unlock it). A typical key is a small piece of metal consisting of two parts: the '' bit'' or ''blade'', which slides into the keyway of the lock and distinguishes between different keys, and the ''bow'', which is left protruding so that torque can be applied by the user. In its simplest implementation, a key operates one lock or set of locks that are keyed alike, a lock/key system where each similarly keyed lock requires the same, unique key. The key serves as a security token for access to the locked area; locks are meant to only allow persons having the correct key ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Door Breaching
Door breaching is a process used by military, police, or emergency services to force open closed or locked doors. A wide range of methods are available depending on the door's opening direction (inward or outward), construction materials, etc., and one or more of these methods may be used in any given situation. In the United States, residential doors typically open inward while commercial building doors usually open outward. Some breaching methods require specialized equipment and can be categorized as one of the following: mechanical breaching, ballistic breaching, hydraulic breaching, explosive breaching, or thermal breaching. Manual methods The simplest solution is to check the door knob first. Utilizing a breaching tool is unnecessary if the door is unlocked and easy to open. If the door is locked, breachers can attempt to force inward-opening doors with a strong kick. The breacher will aim to hit the door near the locking mechanism, but not kick the doorknob itself as on ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Fire Safety
Fire safety is the set of practices intended to reduce destruction caused by fire. Fire safety measures include those that are intended to prevent wikt:ignition, the ignition of an uncontrolled fire and those that are used to limit the spread and impact of a fire. Fire safety measures include those that are planned during the construction of a building or implemented in structures that are already standing and those that are taught or provided to occupants of the building. Threats to fire safety are commonly referred to as fire hazards. A fire hazard may include a situation that increases the likelihood of a fire or may impede fire escape, escape in the event a fire occurs. Fire safety is often a component of building code, building safety. Those who inspect buildings for violations of the Fire Code and go into schools to educate children on fire safety topics are Fire Department members known as ''Fire Prevention Officers''. The Chief Fire Prevention Officer or Chief of Fire ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Segal Lock And Hardware Company
The Segal Lock and Hardware Company of Manhattan, New York, was a leading manufacturer of hardware merchandise and razor blades in the 1920s and 1930s. Established in Connecticut and Manhattan, the firm relocated to Brooklyn, New York, in the mid-1920s. The Segal Safety Razor Corporation was a subsidiary of the Segal Lock and Hardware Company. The business was at first known as the Burglar-Proof Lock Company. Segal was started by Samuel Segal, formerly a New York City detective in 1912,"Mrs. Samuel Segal Dies", ''New York Times'', July 5, 1957, pg. 17. through his invention of a nearly burglar-proof lock. The vertical deadbolt lock eliminated a horizontal bolt, concentrating on the hinge principle. Segal had noticed that burglars forced locks but never hinges. The firm's beginning was aided by a few more policemen. The original capital was approximately $1,000. Segal and his associates refused $1,000,000 in cash for their fifty separate lock patents. Shortly before her death Mrs. Ma ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Crowbar (tool)
A crowbar, also called a wrecking bar, pry bar or prybar, pinch-bar, or occasionally a prise bar or prisebar, colloquially gooseneck, or pig bar, or in Australia a jemmy, is a lever consisting of a metal bar with a single curved end and flattened points, used to force two objects apart or gain mechanical advantage in lifting; often the curved end has a notch for removing nails. The design can be used as any of the three lever classes. The curved end is usually used as a first-class lever, and the flat end as a second-class lever. Designs made from thick flat steel bar are often referred to as utility bars. Materials and construction A common hand tool, the crow bar is typically made of medium-carbon steel, possibly hardened on its ends. Commonly crowbars are forged from long steel stock, either hexagonal or sometimes cylindrical. Alternative designs may be forged with a rounded I-shaped cross-section shaft. Versions using relatively wide flat steel bar are often ref ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Jamb
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 construction, constructi ..., a jamb (), is the side-post or lining of a doorway or other aperture. The jambs of a window outside the frame are called . Small shafts to doors and windows with caps and bases are called ; when in the inside arris of the jamb of a window, they are sometimes called . A doorjamb, door jamb, or sometimes doorpost is the vertical portion of the door frame onto which a door is secured. The jamb bears the weight of the door through its hinges, and most types of door latches and deadbolts 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 ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
The Sydney Morning Herald
''The Sydney Morning Herald'' (''SMH'') is a daily Tabloid (newspaper format), tabloid newspaper published in Sydney, Australia, and owned by Nine Entertainment. Founded in 1831 as the ''Sydney Herald'', the ''Herald'' is the oldest continuously published newspaper in Australia and claims to be the most widely read masthead in the country. It is considered a newspaper of record for Australia. The newspaper is published in Compact (newspaper), compact print form from Monday to Saturday as ''The Sydney Morning Herald'' and on Sunday as its sister newspaper, ''The Sun-Herald'' and digitally as an Website, online site and Mobile app, app, seven days a week. The print edition of ''The Sydney Morning Herald'' is available for purchase from many retail outlets throughout the Sydney metropolitan area, most parts of regional New South Wales, the Australian Capital Territory and South East Queensland. Overview ''The Sydney Morning Herald'' publishes a variety of supplements, including ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Door Security
The term door security or door security gate may refer to any of a range of measures used to strengthen doors against door breaching, ram-raiding and lock picking, and prevent crimes such as burglary and home invasions. Door security is used in commercial and government buildings, as well as in residential settings. Some strengthened doors function as fire doors to prevent or inhibit the spread of fire. Security devices Alarms Alarms — designed to warn of burglaries. Locks * Smart locks can be used to limit door access to only people with an electronic key fob or near-field communication device, like a smartphone. These devices are popular with landlords, who can enable and disable digital access without physically mailing out keys. The locks can log the times of entry, and can trigger an alarm if they are struck during a break-in attempt. * Deadbolts — unlike common spring latches, the locking mechanism of these typically prevents the bolt from being retracted by force, ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
Lock Bumping
Lock bumping is a lock picking technique for opening a pin tumbler lock using a specially crafted bump key, rapping key or 999 key. A bump key must correspond to the target lock in order to function correctly. History A US patent first appears in 1928 by H. R. Simpson called a rapping key.''High Security Mechanical Locks - An Encyclopaedic Reference'' published by Graham W. Pulford 2007, p. 19 In the 1970s, locksmiths in Denmark shared a technique for knocking on a lock cylinder while applying slight pressure to the back of the lock plug. When the pins would jump inside of the cylinder, the plug would be able to slide out freely, thus enabling the locksmith to disassemble the lock quickly. The use of a bump key was not introduced until some time later and was first recognized as a potential security problem around 2002–2003 by Klaus Noch, who brought it to the attention of the German media. After further examination of the procedure, a white paper was drafted in 2005 by Barr ... [...More Info...] [...Related Items...] OR: [Wikipedia] [Google] [Baidu] |
