Puzzle lock

A puzzle lock or puzzle padlock is a type of mechanical puzzle. It consists of a lock with unusual or hidden mechanics. Puzzle locks are reconfigurable mechanisms where the topological structure changes during the operation.[1] Such locks are sometimes called trick locks, because there is a trick to opening them which needs to be found. Puzzle locks exist both with keys and without keys.

China

Puzzle locks with exposed keyholes were widely used in ancient China and can be very tricky to open.[1]

There are three main types in China:[1]

  • Locks with extra obstacle
  • Locks with indirect insertion
  • Multi-stage locks.

Europe

In Europe, many small puzzle padlocks had front plate with a face or mask. The padlocks were designed to secure small bags or pouches and could be found across Europe with the most around the Danubian provinces and Aquileia.[2] They were often shaped like rings and may have been fitted around the mouth of a bag as a sort of tamper-proof seal.[3] The earliest Roman puzzle locks date back to the 2nd century BCE. [4]

In the 1850s in the UK, "puzzle lock" was synonymous with "letter lock" and used to denote a lettered combination lock.[5]

See also

References

  1. ^ a b c Hsiao, Kuo-Hung. "On the structural analysis of open-keyhole puzzle locks in ancient china".
  2. ^ Slocum, Jerry. Romano-Celtic Mask Puzzle Padlocks: A Study in their Design, Technology and Security.
  3. ^ Grundhauser, Eric. "The Fashion and Mystery of Ancient Roman Puzzle Locks". Atlas Obscura.
  4. ^ Rhoda, Andrew. "The Jerry Slocum Mechanical Puzzle Collection at Indiana University". Indian State Library. Retrieved 15 November 2021.
  5. ^ Minutes of Proceedings of the Institution of Civil Engineers. 1854.

Read other articles:

Carlos Jorge Neto Martins

Carlos Martins Martins berseragam PortugalInformasi pribadiNama lengkap Carlos Jorge Neto MartinsTanggal lahir 29 April 1982 (umur 41)Tempat lahir Oliveira do Hospital, PortugalTinggi 1,73 m (5 ft 8 in)Posisi bermain GelandangInformasi klubKlub saat ini BelenensesNomor 12Karier junior1990–1993 Tourizense1993–2001 Sporting CPKarier senior*Tahun Tim Tampil (Gol)2001–2007 Sporting CP 76 (9)2001–2002 → Campomaiorense (pinjaman) 27 (1)2003 → Académica (pinjaman) 9...

 

Creation and evolution in public education

Status of creation and evolution in public education Part of a series onCreationism History Types Young Earth Time dilation creationism Old Earth day-age gap progressive Neo-creationism Biblical cosmology Book of Genesis creation narrative framework interpretation as an allegory Omphalos hypothesis Creation science Created kind Flood geology Creationist cosmologies Intelligent design Rejection of evolution by religious groups History Public education Teach the Controversy Religious views Non-...

 

Samuel W. Dana

American politician For other people named Samuel Dana, see Samuel Dana (disambiguation). Samuel Whittlesey Dana1806 engraving by Charles Balthazar Julien Févret de Saint-Mémin.United States Senatorfrom ConnecticutIn officeDecember 4, 1810 – March 3, 1821Preceded byJames HillhouseSucceeded byElijah BoardmanMember of the U.S. House of Representativesfrom Connecticut's At-Large districtIn officeJanuary 3, 1797 – May 10, 1810Preceded byUriah TracySucceeded byEbenezer Hunt...

Organizzazione internazionale

La Banca dei regolamenti internazionali a Basilea (Svizzera) viene generalmente considerata come l'organizzazione internazionale finanziaria più importante del mondo. Un'organizzazione internazionale è un tipo di organizzazione a carattere internazionale con membri, scopo o presenza a rilievo internazionale; ovvero con sedi, attività e interessi in più paesi del mondo; si parla invece di organizzazione intergovernativa (OIG) quando i componenti dell'organizzazione sono governi di Stati, i...

 

دوري هونغ كونغ لكرة القدم 1998–99

هذه المقالة تحتاج للمزيد من الوصلات للمقالات الأخرى للمساعدة في ترابط مقالات الموسوعة. فضلًا ساعد في تحسين هذه المقالة بإضافة وصلات إلى المقالات المتعلقة بها الموجودة في النص الحالي. (نوفمبر 2019) دوري هونغ كونغ لكرة القدم 1998–99 تفاصيل الموسم دوري هونغ كونغ الدرجة الأولى &...

 

2008 IIHF Women's World Championship

2008 IIHF Women's World ChampionshipTournament detailsHost country ChinaCityHarbinVenue(s)2 (in 1 host city)Dates4–12 April 2008Opened byHu JintaoTeams9Final positionsChampions  United States (2nd title)Runner-up  CanadaThird place  FinlandFourth place  SwitzerlandTournament statisticsGames played20Goals scored117 (5.85 per game)Attendance22,910 (1,146 per game)Scoring leader(s) Natalie Darwitz (10 points)MVP N...

Temple Hill (Hong Kong)

Hill between New Kowloon and the New Territories, Hong Kong For the residential area in New Kowloon, see Tsz Wan Shan. Temple Hill慈雲山View of Temple HillHighest pointElevation488 m (1,601 ft)Coordinates22°21′22″N 114°12′24″E / 22.356094°N 114.206572°E / 22.356094; 114.206572GeographyTemple HillLocation of Temple Hill in Hong Kong Location Hong Kong Temple Hill, also known as Tsz Wan Shan (Chinese: 慈雲山), is a hill between N...

 

Krystian Bielik

Krystian Bielik Bielik bersama Arsenal U-19 pada 2015Informasi pribadiNama lengkap Krystian Bielik[1]Tanggal lahir 4 Januari 1998 (umur 26)Tempat lahir Konin, PolandiaTinggi 1,89 m (6 ft 2+1⁄2 in)[2]Posisi bermain Gelandang bertahanInformasi klubKlub saat ini Birmingham CityNomor 6Karier junior Górnik Konin2012–2014 Lech PoznańKarier senior*Tahun Tim Tampil (Gol)2014–2015 Legia Warszawa 5 (0)2015–2019 Arsenal 0 (0)2017 → Birmingham City (pi...

 

Table tennis at the 1994 Asian Games

Table tennis at the 1994 Asian GamesVenueAsakita Ward Sports CenterDates5–14 October 1994← 19901998 → Table tennis was contested at the 1994 Asian Games in Asakita Ward Sports Center, Hiroshima, Japan from 5 October 1994 to 14 October 1994. Table tennis had team, doubles and singles events for men and women, as well as a mixed doubles competition. Medalists Event Gold Silver Bronze Men's singles Wang Tao China Yoo Nam-kyu South Korea Kim Taek-soo S...

مملكة الزولو

مملكة الزولو مملكة الزولوالعلم   الأرض والسكان إحداثيات 28°17′51″S 31°25′18″E / 28.2975°S 31.4217°E / -28.2975; 31.4217   عاصمة بولاوايوأولوندي  اللغة الرسمية الزولوية  التعداد السكاني 250000 (1824)  الحكم نظام الحكم المشيخة  التأسيس والسيادة التاريخ تاريخ التأسيس 1816 وس...

 

Patrick Fugit

Patrick FugitFugit pada Oktober 2018LahirPatrick Raymond Fugit27 Oktober 1982 (umur 41)Salt Lake City, Utah, Amerika SerikatPekerjaanAktorTahun aktif1997–sekarangAnak1 Patrick Fugit (lahir 27 Oktober 1982) merupakan seorang aktor berkebangsaan Amerika Serikat. Dia menjadi yang terkenal saat dia diperankan sebagai Cameron Crowe di film Almost Famous. Dia merupakan alumni University of Utah. Filmografi Almost Famous (2000) White Oleander (2002) Spun (2002) Saved! (2004) Dead Birds ...

 

List of ATP number 1 ranked singles tennis players

List of ATP number 1 ranked male players redirects here. For doubles players, see List of ATP number 1 ranked doubles tennis players. Novak Djokovic, the current men's singles world No. 1 The PIF ATP rankings[1] are the Association of Tennis Professionals' (ATP) merit-based system for determining the rankings in men's tennis. The top-ranked player is the player who, over the previous 52 weeks, has garnered the most ranking points on the ATP Tour. Points are awarded based on how far a...

Sperm whale

Largest species of toothed whale Cachalot redirects here. For other uses, see Cachalot (disambiguation). Kashalot redirects here. For the Soviet submarine, see Kashalot-class submarine. For the 2015 film, see Sperm Whale (film). Sperm whale[1]Temporal range: Pliocene – Recent[2] PreꞒ Ꞓ O S D C P T J K Pg N ↓ Conservation status Vulnerable  (IUCN 3.1)[3] CITES Appendix I (CITES)[4] Scientific classification Domain: Eukaryota Kingdom: Animal...

 

Rothschild banking family of Naples

Neapolitan banking family This article has an unclear citation style. The references used may be made clearer with a different or consistent style of citation and footnoting. (July 2011) (Learn how and when to remove this message) C M de Rothschild & Figli redirects here. For other Rothschild-branded banks, see Rothschild Bank (disambiguation). Arms of the Rothschild family The Rothschild banking family of Naples (Italian: Famiglia di banchieri Rothschild) was the Neapolitan branch of the...

 

哈萨克斯坦总统

此条目序言章节没有充分总结全文内容要点。 (2019年3月21日)请考虑扩充序言，清晰概述条目所有重點。请在条目的讨论页讨论此问题。 哈萨克斯坦總統哈薩克總統旗現任Қасым-Жомарт Кемелұлы Тоқаев卡瑟姆若马尔特·托卡耶夫自2019年3月20日在任任期7年首任努尔苏丹·纳扎尔巴耶夫设立1990年4月24日（哈薩克蘇維埃社會主義共和國總統） 哈萨克斯坦 哈萨克斯坦政府...

LeShuttle

Car shuttle train service between England and France LeShuttleOverviewMain station(s) Folkestone, United Kingdom Calais, France Fleet size 58 Eurotunnel Class 9 locomotives 9 passenger vehicle shuttle trains 15 heavy goods vehicle shuttle trains Stations called at2Parent companyGetlinkReporting markETOtherWebsiteleshuttle.com System map LeShuttle[1] (formerly Eurotunnel Le Shuttle and also known as The Shuttle) is a railway shuttle service between Calais in France and Folkestone in Un...

 

Abrikosov vortex

Vortices in a 200-nm-thick YBCO film imaged by scanning SQUID microscopy[1] In superconductivity, a fluxon (also called an Abrikosov vortex or quantum vortex) is a vortex of supercurrent in a type-II superconductor, used by Alexei Abrikosov to explain magnetic behavior of type-II superconductors.[2] Abrikosov vortices occur generically in the Ginzburg–Landau theory of superconductivity. Overview The solution is a combination of fluxon solution by Fritz London,[3][...

 

كاليثي (هالكيديكي)

  لمعانٍ أخرى، طالع كاليثي (توضيح). كاليثي تقسيم إداري البلد اليونان  [1] التقسيم الأعلى كاساندرا  خصائص جغرافية إحداثيات 40°04′29″N 23°26′55″E / 40.07472222°N 23.44861111°E / 40.07472222; 23.44861111   الارتفاع 49 متر  السكان التعداد السكاني 1233 (resident population of Greece) (2021)717 (reside...

نانسي ويلسون (فنان)

  لمعانٍ أخرى، طالع نانسي ويلسون (توضيح). نانسي ويلسون (بالإنجليزية: Nancy Wilson)‏    معلومات شخصية اسم الولادة (بالإنجليزية: Nancy Lamoureaux Wilson)‏  الميلاد 16 مارس 1954 (70 سنة)[1]  سان فرانسيسكو  مواطنة الولايات المتحدة  عضوة في هارت (فريق روك)  الزوج كاميرون كرو (198...

 

بوابة:الدولة الفاطمية

ثقافة — جغرافيا — تاريخ — علوم — مجتمع — تقانة — رياضة قائمة البوابات الدَّوْلَةُ الفَاطِمِيَّةُ أو الخِلَاْفَةُ الفَاطِمِيَّةُ أو الدَّوْلَةُ العُبَيْدِيَّةُ هي إحدى دُولُ الخِلافةُ الإسلاميَّة، والوحيدةُ بين دُولِ الخِلافةِ التي اتخذت من المذهب الشيعي (ضمن فرعه ا...