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Publication numberUS505299 A
Publication typeGrant
Publication dateSep 19, 1893
Filing dateJan 14, 1893
Publication numberUS 505299 A, US 505299A, US-A-505299, US505299 A, US505299A
InventorsLouis Schneider
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Keyhole-guard
US 505299 A
Abstract  available in
Images(1)
Previous page
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Claims  available in
Description  (OCR text may contain errors)

(N0 Mqdel.)

L. SCHNEIDER. K'BYHULE GUARD.

No 5051299' Patented Sept. 19,1893,

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5f: l I l i Y .//fgyaf UNITED STATES PATENT Errea.

LOUIS SCHNEIDER, OF WILLIAMSPORT, PENNSYLVANIA.

KEYHoLE-GUARD.

SPECIFICATION forming part of Letters Patent No. 505,299, `dated September 19, 1893.

Application filed January 14, 1893. Serial No. 458,353. (No model.)

.To a/ZZ whom it may concern:

Be it known that I, LOUIS SCHNEIDER, a citizen of the United States, residing at Williamsport, in the county of Lycoming and State of Pennsylvania, have invented a certain new and useful Improvement in Keyhole-Guards, of which the following is a specification.

My improved key-hole guard is adapted to match in the key-hole of any ordinary lock, and to serve as a conveniently applicable guard for obstructing the sight through the key-hole and for preventing the use of any' key by unauthorized persons. It may apply on the door of a room or abuilding, either on the inside or outside thereof. I will describe it as applied to the inside of a door of an apartment having an ordinary keyhole eX- tending through in a straight line. y

The accompanying drawings form a part of this specification and represent what I consider the best means of carrying out the invention.

Figure 1 is an elevation partly in vertical section showing my guard in use. The remaining figures are on a larger scale. Fig. 2 is a face view with the cover plate removed. Fig. 3 is a side elevation of the key. Figs. 4 and 5 are edge views of the guard. Fig. 6 is an end elevation of a portion, and Fig. 7 is an end view of the key.

Similar letters of reference indicate corresponding parts in all the figures where they appear. f

A is the main body of the casing, certain portions being designated when necessary by super-numerals, as A.

B is the covering plate of the case, secured to the part A by rivets A', A', which extend upward from the bodyA and are received in corresponding holes in the cover-plate B, to strongly hold the cover and maintain the true positions of the parts.

A2 is a nicely cut screw lying horizontally in the center of the part A, and connected rigidly thereto by a post A3.

G is a cone properly tapped and fitted as a nut on said screw, the small end being toward the post A3, and the large end being scored, as indicated by g to receive the wings of a key and allow it to be turned thereby, as will appear farther on.

D D are iiat levers pivoted on separate rivets A A', and extending outward through sufficient slots a a, in the opposite edge of the casing.

E E are springs secured respectively in the levers D D, which springs acting against a convenient abutting surface in the casing A, urge the levers D D together.

M is a k ey having wings M M on the front of its tubular shank, adapted to engage in the scores q g in the nut G and turn it. A key-hole a is provided in the casing A of proper form to admit this key. The shank o f the key is of such length and the construction of the parts in the interior of the lock are such as to allow this key to be revolved and to follow the cone G as it is traversed down the screw by the rotation received through the key. As it moves its conical surface presses against the adjacent inner edges of the levers D D and urges them apart. The hooks on the levers engage in the interior of the ordinary lock K, and prevent their removal until my key M shall be again used to rotate the cone G in the opposite direction, and allow the levers D to again spring together. The levers D D should be of sufficient length to extend a sufficient distance into the lock to prevent the insertion and operating of akey from the opposite side of the door. It therefore guards effectually against the intrusion of parties from without. It is obvious that my guard may also serve to obstruct, though less effectually, the operating of a key by any unauthorized parties from the same side to which the guard is applied. That is to say, if the occupant of a room on going out, after locking the door, and removing thekey, inserts this guard, and by itsI key M drives the conical nut G forward and eX- tends the levers D, no one can unlock the door until the guard is removed. No ordinary intruder would be likely to have the facilities and skill for introducing Wires or other devices through the key-hole o. and turning the cone G, which is necessary to remove my guard before operating the ordinary lock to open the door. When the proper occupant of the room returns the key M being inserted the guard is removed easily. Where, as in many cases, a key-hole opens only on one side of the door, the device can still be applied in that manner.

Moditications may be made in the details Without departing from the principle or sacricing the advantages of the invention. I can vary the number and arrangement of the hooks on the levers D. The slight notches d, which are adapted to engage the casin g of the lock adjacent to the key-hole, may be omitted, or if such notches are employed and engaged reliably With the casing of the lock, the hooks nearer the ends of the levers may be omitted. It is important that one or both of the levers D D shall extend sufficiently in- Ward to prevent the insertion of the ordinary key or even a skeleton key from the opposite side of the door. The casing may be made in more than two parts. The parts may be secured together by other means than those shown. The scores in the nut G may be varied in size and arrangement, the key being correspondingly modified, so that the diversities in the guards and keys Will tend by Wellknown principles, to prevent the use of any but the proper key in removing the guard.

I have shown the nut as of conical shape, and prefer such, but do not conne the in vention thereto. It is obvious that spheroidal or other forms may be used, taking care to propsprings E E on opposite sides of the nut, in

combination with each other and With the key M and provisions as the Wings h on the key and score g on the nut for engaging these parts to open and close the levers, all arranged for joint operation substantially as herein specified.

In testimony that I claim the invention above set forth I affix my signature in presence of two Witnesses.

LOUIS SCHNEIDER.

Vitnesses:

F. H. McOoRMIcK, CARL HERDIC.

Referenced by
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US5787739 *Mar 27, 1997Aug 4, 1998Acco Brands, Inc.Security hole fastening device
US5983679 *Nov 17, 1998Nov 16, 1999Micro Security Devices, Inc.Portable anti-theft locking anchor
US6000251 *Oct 15, 1993Dec 14, 1999Acco Brands, Inc.Computer physical security device
US6000252 *Jun 5, 1997Dec 14, 1999Acco Brands, Inc.Computer physical security device
US6006557 *Sep 11, 1997Dec 28, 1999Acco Brands, Inc.Computer physical security device
US6112561 *Nov 8, 1996Sep 5, 2000Acco Brands, Inc.Security device for a portable computer
US6155088 *Jun 7, 1995Dec 5, 2000Acco Brands, Inc.Computer physical security device
US6173591Aug 3, 1998Jan 16, 2001Acco Brands, Inc.Security hole fastening device
US6301940 *Oct 6, 2000Oct 16, 2001Acco Brands, Inc.Security hole fastening device
US6321579Nov 12, 1999Nov 27, 2001Micro Security Devices Inc.Portable anti-theft locking anchor
US6553794Jun 23, 2000Apr 29, 2003Acco Brands, Inc.Computer physical security device
US6588241Dec 24, 1996Jul 8, 2003Acco Brands, Inc.Computer physical security device
US6662602Jun 16, 2000Dec 16, 2003Acco Brands, Inc.Security device for a portable computer
US6735990Dec 29, 1997May 18, 2004Acco Brands, Inc.Computer physical security device
US6779370Feb 27, 2002Aug 24, 2004Belkin ComponentsSecurity device, method of manufacturing the same, and method of operating the same
US6971254Aug 24, 2004Dec 6, 2005Belkin ComponentsSecurity device, method of manufacturing the same, and method of operating the same
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US7204106May 18, 2004Apr 17, 2007Acco Brands Usa LlcPortable electronic device physical security
US7234326 *Sep 5, 2006Jun 26, 2007Miz Engineering Ltd.Lock device
US7401481 *Apr 18, 2007Jul 22, 2008Jui Kuo Key-Making Co., Ltd.Lock device for notebook computer
US7409842Jan 14, 2005Aug 12, 2008Acco Brands Usa LlcLock for securing an article on display
US7415852Oct 5, 2005Aug 26, 2008Acco Brands Usa LlcTubular lock with theft deterrent
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US20050022566 *Aug 24, 2004Feb 3, 2005Bellow Stephen LesterSecurity device, method of manufacturing the same, and method of operating the same
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USD651889Jan 10, 2012Acco Brands Usa LlcSecurity apparatus
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WO1996007002A1 *Aug 21, 1995Mar 7, 1996Kensington Microware LimitedSecurity device for a portable computer
WO1996015347A1 *Nov 15, 1994May 23, 1996Kensington Microware LimitedComputer physical security device
WO1996024736A1 *Feb 7, 1996Aug 15, 1996Kensington Microware LimitedComputer physical security device
WO2000029700A1 *Nov 12, 1999May 25, 2000Micro Security Devices, Inc.Portable anti-theft locking anchor
Classifications
Cooperative ClassificationE05B17/16