US1306427A - Keyless padlock - Google Patents

Description

KEYLESS PADLOCK.

Specification of Letters Patent. Patnted June 10, 1919,

Application filed May 29, 1918. Serial N o. 237,257.

Toall 'whom t may concern;

Be it known that I, JENNINGS E. GHISA- MORE, a natural-born citizen of the United States, residing at Jamesport, in the county of Grundy and State of Missouri, have invented certain new and useful Improvements in KeylessPadlocks, of which the following is a specification.

This invention relates to padlocks, and more especially to those Vhaving a pivoted shackle and a sliding bolt; and the object of the saine is to produce a keyless padlock of the permutation type which may be unlocked only by a person whoknows how.

'Io this end the invention consists in a padlock whose shackle is locked by a springpressed bolt when its tip is passed into the casing, or is unlocked by applying pressure to said tip and at the same time retracting the bolt.

Details are set` forth in the following specification and claims, and are shown in the drawings herewith and in which Figure 1 is an elevation of this padlock with the face of the casing removed and the spring in section.V

Fig. 2 is a vertical sectional view on the line 2 2 of Fig. 1.

The casing of this padlock is preferably circular. It comprises a cupped back plate 1 whose flange 2 has openings 3 and l for the shackle; and a disk-like face plate 5 overlying the flange 2 of the back plate and connected centrally with said plate by a rivet 6 so that the two parts are rotatable with respect to each other. The shackle 7 passes through one opening 3 and is pivoted to the back plate at 8, and its other or operative end passes loosely through the opening 4: and is locked within the casing when the padlock is locked, or is withdrawn from said opening and turned back on its pivot 8 when the padlock is unlocked. The free or operative end of the shackle is provided with a hook 10 whose bill is undercut slightly as indicated at 11, and the tip of the hook is beveled as shown `at 12. A spring of strip metal has a loop 18 inclosing the rivet 6, its front leaf 14 underlying the tip 12 of the hook Vwhen the latter is within the casing, and its rear leaf 15 upstanding from the rivet 6 in a position about at right angles to its front leaf 14. Between guides 16 in the back plate slides a bolt 17 whose forward end is enlarged or headed as indicated at 18,

preferably by causing its lower edge to descend slightly to the tip of the bolt, and this enlarged Jortion engages with the undercut bill 11 of the hook when the front leaf 14 bears said hook upward as seen in Fig. 1. Therefore when the bolt is projected and engaged with the hook, not only can the hook not be drawn through the opening l but the bolt cannot be disengaged from the hook until the hook is first pressed inward a little.

An appropriate link 2O connects the rear end of the bolt 17 with the upper extremity mof the rear leaf 15, and a pin 21 carried by the face plate 5 projects into the cupped portion of the casing forward of said leaf 15. When said base plate is turned to the right with respect to the back plate, the pin 21 will travel around the pivot 6 as shown in Fig. 1, and as it does so it will bear on the leaf 15, draw on the link 20, and retract the bolt 17. Meanwhile, if the operator is moving the shackle inward so that the undercut portion 11 of the hook is free to disengage the head 18 of the bolt, then it is clear that the bolt can be withdrawn by the rotation of the face plate. Thusit will be seen that to unlock this padlock two motions are necessary; first the operator with one hand must bear the hooked end of the shackle inward and next with the other hand he must simultaneously rotate the face plate with respect to the back plate. It is quite possible that this compound or simultaneous action could be discovered by an unauthorized person, but I consider it not at all likely. Many persons would press the front end, wiggle it about, draw it outward, and in other ways endeavor to disengage it from the bolt. Others might discover that one part of the casing rotated with respect to the other, but the rotation would not be considerable unless the bolt were unlocked, as it were, from the hook at the saine time, and therefore I do not consider it probable that anyone who probably found the parts of the casing to be relatively rotatable could unlock it. I find-by experience that such a sinall per cent. of persons can unlock this padlock without knowning how, that it is practically safe to use it where padlocks are considered suflicient protection. At any rate, it has no keyhole and no key and really it has no permutation although it acts in a measure on the permutation principle.

The foregoing description and the drawings have reference to what may be considered the preferred, or approved, form of my invention. It is to be understood that I may make such changes in construction and arrangement and combination of parts, ma-v terials, dimesions, et cetera, as may prove expedient and fall within the scope of the appended claims.

Having thus fully described my invention, what I claim as new and desire to secure by Letters Patent, iszl. In a padlock, the combination with a casing consisting of a cupped back plate, a disk-like face plate, and pivotal connections between the two plates at theirv axis; of a shackle pivoted at one end in the back plate and havingy a hook at its other end, a bolt slidably mounted in guides in the back plate for engagement with said hook, means on the hook preventing the retraction of the bolt, a spring Jfor holding these parts in such engagement, an element mounted on thea pivot between the plates, a link connecting it with said bolt, and a pin in the movable face plate bearing against said element and Copies of this patent may be obtained for moving it and retracting the bolt when the face plate is turned kon its ivot.

2. In a padlock, the com ination with a casing consisting of a cupped back plate, a disk-like face plate, and pivotal connections between the two plates at their aXis; of a shackle pivoted at one end lin the back plate and having a hook at its other end with an undercut bill, a bolt slidably mounted in guides in the back plate and having a headed inner end for engagement with said hook, means for holding `it in such engagement, a spring mounted on the pivot between said plates, one arm engaging'the tip ofthe shackle and the other arm being-connected v with .said bolt, Vand a pin inthe/facie plate contacting with the last-named arm whereby rotary movement of the face plate' with respect to the back plate retractsthe bolt.

In testimony whereof I aiix my signature in presence of two witnesses.

c JENNINGS E. GRISAMORE.

Witnesses: Y

IRA C. GRisAMoRE, JN0. W. LIVELY.

ve cents each, by addressing the Commissioner Vof Patents, Washington, D. C.

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