US2212771A - Safety lock - Google Patents

Description

Aug. 27, 1940. v. J. GIARDINA SAFETY LOCK Filed Aug. 19, 1959 Patented Aug. 27, 1940 ,if UNITED STATES PATENT OFFICIEL .SAFETY LOCK Vincent Giardina, Baton Rouge, La.

Application August 19, 1939, Serial No.` 291,092

' 1 Claim. A(Gl. 292-129) lThe present invention relates to improvements in safety locks, and has for an object to provide a burglar proof hook and keeper to be attached to door frames and to either screen or solid doors which will offer a maximum of safety against the insertion of any tool or jimmy used to lift the hook from the keeper eye.

It is another object ofthe invention to provide an improved safety lock in which the device is intended and calculated to hold the hook rmly in the keeper eye unless released from within the house by an intended retraction of the hook and its confining spring.

A further object of the invention is to improve the construction of the hook and its bill whereby a novel cooperation takes place between the hook and its keeper contributed to by the spring which maintains a tension upon the hook and whereby the hook will interlock with the keeper in such a manner that it will be diii'cult to dislodge the same except by a conscious eifort in two predetermined directions which can be expeditiously executed only within the building or room guarded by the improved safety lock.

With the foregoing and other objects in View, the invention will be more fully described hereinafter, and will be more particularly pointed out in the claim appended hereto.

In the drawing, wherein like symbols refer to like or corresponding parts throughout the several views,

Figure 1 is a fragmentary front elevation of a door and door frame showing the improved safety lock in locked position and with parts thereof broken away and parts shown in section.

Figure 2 is a top plan View of the same.

Figure 3 is a fragmentary side View of the hook raised out of the keepershown in section and with dotted lines'showing the hook as moved down into the keeper.

Figure 4 is a side View of the hook shank partially broken away and with the cooperating coil spring shown in section, and

Figure 5 is "a side view of the casing and a part of the hook shank showing in section a modied form of device.

Referring more particularly to the drawing 6 designates a door and 'i a door frame. Upon one or other of these parts is mounted the keeper eye 8 and upon the other cooperating part is the screw eye 9 upon which is swivelly mounted a casing or sleeve Ill. At one end such casing or sleeve I0 is formed with a perforated flattened part II while at its other end the casing I0 is turned in for a purpose later described. In Figure 5 a modication is shown in which the turned in end I2 is replaced by the screw threads I3; and-the nut` I4.

` Either the inturned end I2 or the nut I4 extends closely about the shank I5 of the hook whereby the shank I5 may have a longitudinally sliding t at one end in the casing I0. At this conned end the shank I5 is enveloped ,by a coil spring I6, one end of which abuts against and is conned by the inturned casing end I2' or the end of the nut I4 of Figure 5.

The opposite end of the coil spring I6 may be afxed to the shank I5 in any appropriate manner, for instance as shown in Figure 4, where the end or terminal convolution or helix I8 of spring I6 is wound tightly within the groove I'I formed near the inner end of the shank I5.

-The thrust of Athe coil spring I6 reacting against the inturned end I2 or nut I4 and developed through end helix I8 and groove II tends to move the shank I5 inwardly of the casing yet enables the shank I5` to be drawn out through a compressive action of the spring.

At its outer free end the shank I5 is formed into a hook, the component parts of which are a goose neck I9 and the bill 2l with its reversely curved part 22. A curved portion lies between the shank I5 and the goose neck I9, this curved portion being a part of the one piece metallic rod with the shank I5 and the hook. It will of course be understood that these parts may be made separately if desired. The reversely curved part 22 is formed with an inclined shoulder 23, the shoulder terminating adjacent the constricted throat 24 through which the keeper 8 rather .narrowly passes.

The higher end of the inclined shelf or shoulder 23 is formed opposite the curved portion 20. Therefore this higher end and the portion 20 approach one another and form a narrow throat.

In the use of Athe device, the reversely curved wall 22 produces a rounded extremity 25 which encounters the keeper 8 when the hook descends, it being understood that the spring I6 is so selected as to strength and its distended positionl as to draw the hook and its shank to the right so that the normal position of the hook will be as indicated in Figure 3 when it is freed from the keeper and when it is brought down upon the keeper. The hook will be held by spring I6 in this position of tension. However when the rounded extremity 25 engagesvthe rounded portion of the keeper eye 8 and the hook is forced further down, the right hand edge of part 22 will ride down upon the rounded keeper part 8 and shift the bill and the shank over to the left, thus compressing the spring I6. The rounded portion 2l! will tend to guide the keeper 8 into the narrow throat 2li and into the conned space within goose neck BS. As soon as the hook is forced down sufficiently so that the keeper 8 clears the shoulder 23, the coil spring l5 will snap the hook back to the right thus causing the bill 2l to be brought against the keeper 8 in alinement with the reversely curved part 22, and will cause the keeper to lie upon shoulder 23. The inclined shoulder will ride up on the lower part of the keeper as the spring IG pulls the shank and hook in the right hand direction. The higher part of the inclined shoulder 23- being toward the right that isi-toward the free edge of the shoulder, will prevent the keeper from riding off such shoulder; or rather will prevent the shoulder from backing off the keeper. The high end of shoulder 23 performs a further function of extending toward the curved portion 20 and serving to narrow down the throat 24.

The coil spring ES contributes to hold the keeper upon the inclined shoulderv23 and within the confined space within the goose neck I9 and from escaping through throat 24, while the inclination of the shoulder 23 makes it diicult for the hook to back off or raise up from the keeper.

It is obvious that various changes and modifications may be made in the details of construction and design of the above specifically described embodiment of this invention without departing from the spirit thereof, such changes and modifications being restricted only by the scope of the following claim.

What is claimed is:

l In combination with a keeper, a spring pressed hook comprising a bill having a gooseneck portion for coniining an enclosed space to receive said keeper with an open throat portion, a bill on said hook forming a thickened portion across said throat for narrowing the throat and also providing a shelf inwardly of the throat and within said enclosed space, said shelf being inclined with its upper portion lying next to the throat.

i VINCENT J. GIARDINA.

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