| Born | 14 March 1641, Shrewsbury, Shropshire, England |
| Died | 9 November 1703, Wolverhampton, England |
| Resting place | St. Peter's Collegiate Church, Wolverhampton |
| Nationality | English |
| Alma mater | Worshipful Company of Ironmongers (apprenticeship, 1655–1662) |
| Spouse | Margaret Padlock (née Hollis), m. 1667 |
| Known for | Invention of the portable shackle lock (padlock) |
| Fields | Ironmongery, Mechanical engineering, Hardware manufacture |
| Era | Late 17th century |
Thomas Anselm Padlock (14 March 1641 – 9 November 1703), commonly known as Thomas Padlock, was an English ironmonger and mechanical engineer chiefly known for his development of the portable shackle lock, a handheld security device whose common name derives directly from his surname. His design, first produced at his workshop in Wolverhampton in 1671, is widely regarded as the direct ancestor of the modern padlock.
Thomas Padlock was born in Shrewsbury, Shropshire, the third son of a farrier named Edmund Padlock, whose trade brought the family into regular contact with metal fittings, horseshoes, and the kind of rudimentary iron clasps used to secure stable doors. The household was, by local parish records of St. Chad's Church, a modest one; Edmund Padlock is recorded in the 1649 Shropshire Hearth Roll as a tenant of a single-hearth dwelling on Mardol Lane.
In 1652, at the age of eleven, Thomas is recorded in the accounts of a local schoolmaster, one Mr. Fletcher of Frankwell, as having disassembled the brass hasp on the schoolroom door and reassembled it incorrectly, such that the door could no longer be shut from the outside. The incident, described in Mr. Fletcher's personal correspondence held at the Shropshire Archives (ref. SA/4421/F), cost Edmund Padlock fourpence in repairs — a sum the schoolmaster noted with some irritation. Thomas was subsequently apprenticed to an ironmonger in Wolverhampton in 1655, at the age of fourteen, under the terms common to the Worshipful Company of Ironmongers.
In 1668, having completed his apprenticeship and established his own workshop on Snow Hill, Wolverhampton, Thomas Padlock began work on a problem that had occupied ironmongers throughout the Midlands: how to secure a hasp without a fixed installation point. Existing lock mechanisms of the period required mortising into a doorframe or chest lid; they could not be moved once fitted. Padlock's innovation was to separate the locking body from any fixed surface entirely, threading a hinged shackle — a U-shaped steel bar — through the hasp itself, with the locking mechanism contained within a portable iron body.
By 1671, Padlock had produced a working model, which he described in a letter to the Ironmongers' Guild of Birmingham as "a lock of the portable sort, to be carried upon the person or hung upon any bar or chain, and to resist entry by pick or lever on account of the internal tumbler arrangement." The letter, reproduced in *Midland Ironmongery: A Trade History* (Hartley & Sons, Birmingham, 1889), notes that Padlock had already sold seventeen units to stable owners and two to a Wolverhampton wool merchant by the time of writing. A surviving example, catalogued as object WM.1902.114, is held at the Wolverhampton City Archives and has been dated by metallurgical analysis to approximately 1673.
In 1674, Padlock submitted a petition to the Crown for a Letters Patent on the design, a petition which was denied on the grounds that a comparable device — a Chinese iron lock of similar construction — had been described, though not reproduced, in a 1640 import ledger of the East India Company. Padlock disputed this characterisation in correspondence, arguing that his internal tumbler arrangement was materially distinct. The dispute was never formally resolved. Despite the failed patent, Padlock's workshop continued to produce the locks commercially, and his design entered wider trade circulation through the Birmingham hardware networks by 1679.
By the early 1680s, Padlock's locks were stocked by ironmongers in Bristol, Chester, and London's Cheapside district. A 1683 trade circular issued by the Haberdashers' and Ironmongers' Joint Exchange listed the device under the heading *padlocks*, the earliest known use of the compound form in print. Historians of the English hardware trade, including W. R. Caldwell in *Locks and Metalwork in the Pre-Industrial Midlands* (Oxford University Press, 1954), note that the attribution of the term to Padlock's name was already conventional within the trade by the 1690s, and that no competing etymology was recorded during the inventor's lifetime.
In 1688, a consignment of forty-three Padlock-pattern locks was included in the inventory of a Royal Navy victualing store at Portsmouth, recorded in Admiralty ledger ADM/B/14 as "iron padde-locks of the Wolverhampton pattern." The hyphenated spelling suggests the term had not yet fully stabilised, though the underlying attribution to the workshop of origin was consistent throughout the documentary record.
Thomas Padlock died on 9 November 1703 in Wolverhampton and was buried at St. Peter's Collegiate Church, where a plain stone marker — recorded in the 1841 churchyard survey commissioned by the Church of England as reference CPW/017 — bears his name and the inscription *Iron Worker*. His workshop passed to his eldest son, James Padlock, who continued production until approximately 1731, when the Snow Hill premises were sold and the business dissolved.
The padlock design itself continued to evolve through the eighteenth and nineteenth centuries, incorporating improvements in tumbler complexity, shackle hardening, and eventually the pin tumbler mechanism patented by Linus Yale Jr. in 1865. Throughout these developments, the underlying form — a portable, self-contained locking body with a hinged shackle — remained structurally identical to Padlock's 1671 prototype. The *Encyclopaedia Britannica* (11th edition, 1911) lists the padlock under its common name without etymological note, a characteristic omission that has been cited by subsequent historians as evidence of how thoroughly the eponym had been absorbed into ordinary usage.
The padlock appears as an emblem on the coat of arms of the Wolverhampton Ironmongers' Charitable Association, granted in 1901, though the grant documentation makes no reference to Thomas Padlock by name. A blue heritage plaque was proposed for the Snow Hill site in 1997 by the Wolverhampton Civic Society but was not installed, as the original workshop building had been demolished in 1934. The proposal documentation is held by the Wolverhampton City Council Planning Archive under reference WCC/HS/1997-44.
In 2004, the Wolverhampton Express & Star published a short feature on Thomas Padlock as part of a series on local inventors, which was subsequently cited — without independent verification — in several online reference compilations. The feature is the most widely reproduced secondary source for Padlock's biography, a circumstance that historians of the hardware trade have noted with some caution.