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Publication numberUS2559549 A
Publication typeGrant
Publication dateJul 3, 1951
Filing dateDec 18, 1947
Priority dateDec 18, 1947
Publication numberUS 2559549 A, US 2559549A, US-A-2559549, US2559549 A, US2559549A
InventorsPaul Sevcik
Original AssigneePaul Sevcik
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Plugging device for door locks
US 2559549 A
Abstract  available in
Images(1)
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Claims  available in
Description  (OCR text may contain errors)

July 3, 1951 I P. SEVCIK PLUGGING DEVICE FOR DOOR LOCKS Filed Dec.

IN VEN TOR.

Patented July 3, 1951 UNITED STATES PATENT OFFICE PLUGGING DEVICE FOR DOOR LOCKS Paul sevinohica o, Ill.

Application December 18, 1947, Serial No. 792,536

8 Claims. 1

My invention relates to door locks of the mortise type, and more particularly to those found in hotels, rooming houses and the like. Such locks usually receive a skeleton key, and therefore offer little security against unauthorized entrance to the premises. It is therefore one object of the present invention to provide a device which an occupant can use for plugging the keyholes of the lock when retiring or leaving the premises, so that it will be impossible for anyone to insert a key into the look from the outside.

A further object is to provide a unit which is insertible into the look from the outside or the inside by way of the keyhole and has a control for expanding the unit inside the lock to constitute a plug for the same.

Another object is to provide a control which is easily removable from the plugging device by the user thereof, whereby to leave no projection or sign in front of the door which may invite curiosity or tampering.

An important object is to provide the device with few and simple parts and in a manner to admit of fine variations and combinations in its control, in order to prevent the easy duplication thereof.

With the above objects in view, and any others which may suggest themselves from the descrip tion to follow, a better understanding of the invention may be had by reference to the accompanying drawing, in which Fig. 1 is a side elevation of the look as mounted in a fragment of a door;

Fig. 2 is a section on the line 2-2 of Fig. 1, showing the plugging unit and its control separated therefrom;

Fig. 3 is an enlarged elevation of the device, showing the control fitted in the plugging unit, and the latter in the normal or contracted positions;

Fig. 4 is a bottom plan view of the showing in Fig. 3, with the control partly broken away;

Fig. 5 is an enlarged section on the line 5-5 of Fig. 3, partly in elevation and in the plugging of a housing It and a control key It. Ordinarily the plugging unit is carried by the key 16, and Fig. 2 shows that such unit has been inserted to pass through the lock iii by way of the keyholes ii, and that the key it has been withdrawn from the plugging unit. The rear portion of the housing [5 is wrapped with a jacket ll which gathers underneath with doubled wings 18, these leading into the first keyhole H and retaining the housing i5 against turning motion. However, the key it is intended to be given turning motion and therefore receive a swivel eye at for attachment to a chain, tag or other holder.

The principle of the plugging device is to introduce a pair of folded hinge plates into the lock it by way of the receiving keyhole, and then to. have such plates spread and form a bar against the retraction or advance of the plugging unit. With the latter lodged in the look no ordinary key can be inserted into the same from either side of the door.

To operate as described, the plugging device is constructed substantially as shown in Figs. 5 to 7. In these figures it is indicated that the housing l5 contains a tubular slide 22 which is thickened at its rear end as indicated at 23 and tapped as shown at 24 to receive a screw 25 extended from a stem 26 forming a reduction of the key IS. The slide 22 has registering diametrical slots 2'! through which a cross-pin 29 carried by the housing i5 passes. Thus, when the key It is inserted into the rear end of the housing as indicated in Fig. 5, with the screw 25 directed toward the tapped bore 26, the stem 26 makes a sliding fit in such end and starts the screw 25 in the bore 24 as the shoulder formed by the stern on the key it meets the housing. With the key in threading rotation, the thickened portion 23 acts as a traveling nut to move the slide rearwardly. It follows, therefore, when the turning of the key it is reversed, that the movement of the slide is forward until it rides oil the screw 25, in which event the key It can be retracted and removed.

The hinge plates previously referred to are indicated at 30 in Figs. 5 and 7; and Fig. 6 shows their alternate hinge ears 3| journaled on a center rod 3Ia carried by a plug 32 which forms a frontal closure for the housing. A slide bar 33 is located beneath the housing l5 and operates in a slot 33a in the Wings 3. The slide bar is connected for motion with the slide 22 by a stud 34 which is fitted into a thickened medial portion 35 of the slide. Clearance for the stud is made by a bottom slot 36 made in the housing l5. The slide bar 33 has its forward end in the form of a wedge 31. An outward extension 38 of the stud 34 serves as an anchor for a hairpin spring 39 whose arms spread against the inner faces 01 the hinge plates 30, threading through openings 4B in the same. The hairpin spring is thus retained in engagement with the hinge plates, and its function is to lead with a spreading influence on the hinge plates before the wedge enters between them.

A compression spring 45 between the hinge ears 3| and the front end of the slide 22 serves to urge the latter to the forward position shown in Figs. 5 and 6. This action also advances the wedge 37 between the hinge plates 38 to spread them as indicated in Figs. 5 and 7. However, the rearward motion of the slide acts to gather the hinge plates through the agency of Oblique cams it formed by a longitudinal V-cut made in the bottom wall of the slide; and the backing of the slide withdraws the wedge 31 atthe same time to allow the hinge plates to gather.

It has been mentioned that the plugging unit is ordinarily carried by the key it. Since the latter is necessarily joined to the unit by the screw 25 threaded into the slide, it follows that the hinge plates 38 are in gathered relation, making the plugging device compact enough to be carried in the pocket or from a key ring or chain. Now, in case it is desired to plug the door look from the outside when leaving or from the inside when retiring it is only necessary to insert the plugging unit into the look from the corresponding side of the door and rotate the key [6 in the unthreading direction. As this is done, the spring 45 bears forwardly on the slide, urging it to ride off the screw 25. At the same time the slide cams 46 become more widely spaced, permitting the arms of the hairpin spring 39 to urge the hinge plates apart. The advance of the slide then interposes the wedge 31 to positively spread the plates apart and form a plug for the lock. By this time the key has been removed and may be kept in the pocket, a drawer or any other convenient place until its application to the plugging unit for the removal of the same is again required.

It is now apparent that the novel plugging device is a simple and compact accessory capable of application to any mortise type door lock to render the same proof against attempts to open it with a conventional key. Also, the device may be made with a wide variety of combinations in respect to dimensions and fit between the key and the plugging unit, so as to discourage duplication of keys or plugging units by unscrupulous persons. Finally, the device is constructed on well established mechanical principles, has few parts, and may be mastered and used with facility by the average person.

While I have described the invention along specific lines, various minor changes or refine ments may be made therein without departing from its principle, and I reserve the right to employ all such changes and refinements as may come within the scope and spirit of the appended claims.

I claim 1' l. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the look through either keyhole when the unit is assembled with a control, means effective on said plates when the controlis removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, and a connection between the latter and the slide to procure said movement thereof.

2. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the lock through either keyhole when the unit is assembled with a control, means effective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said unit including a housing, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, the latter finding a bearing in the housing, other means checking the slide from rotary movement relative to the housing, and a threading connection between the control and the slide eirective to move the same as stated when the control is rotated accordingly.

3. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the look through either keyhole when the unit is assembled with a control, means effective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said unit including a housing, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, the latter finding a bearing in the housing, the slide having a tapped bore opposite the control, and a screw extended from the latter and adapted to thread into said bore when the control is rotated in a given direction to procure the said movement on the part of the slide.

4. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the lock through either keyhole when the unit is assembled with a control, means effective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation eifective to gather said plates when the slide moves in the direction of said control, a connection between the latter and the slide to procure said movement thereof, and yieldable means urging the slide in a direction opposite from said control.

5. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the lock through either keyhole when the unit is assembled with a control, means effective on said plates when the control is re-, moved to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, a connection between the latter and the slide to procure said movement thereof, and a compression spring interposed between said plates and the end of the slide remote from said control, such spring being eifective to urge the slide in a direction opposite from said control.

6. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufficiently close to permit the insertion of the unit into the look through either keyhole when the unit is assembled with a control, means effective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation efiective to gather said plates when the slide moves in the direction of said control, a connection between the latter and the slide to procure said movement thereof, and means carried by the slide and elfective to separate said plates on the return movement of the slide.

7. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufiieiently close to permit the insertion of the unit into the lock through either keyhole when the unit is assembled with a control, means efiective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, a connection between the latter and the slide to procure said movement thereof, yieldable means carried by the slide to urge the said plates apart on the departure of said cam formation, and positive means also carried by the slide and entering between said plates to spread them apart.

8. A plugging device for mortise-type door locks comprising a unit having a pair of hinged plates folded sufiiciently close to permit the insertion of the unit into the lock through either keyhole when the unit is assembled with a control, means eifective on said plates when the control is removed to expand them and constitute the unit a plug barring the insertion of a regular key into the lock, said means comprising a slide with a cam formation effective to gather said plates when the slide moves in the direction of said control, a connection between the latter and the slide to procure said movement thereof, a hairpin spring with its arms urging the plates apart on the departure of said cam formation, and a wedge also carried by the slide and entering between said plates to spread them apart.

PAUL SEVC IIK.

REFERENCES CITED The following references are of record in the file of this patent:

UNITED STATES PATENTS Number Name Date 1,713,602 Heiden May 21, 1929 1,819,059 Schmid Aug. 18, 1931 FOREIGN PATENTS Number Country Date 436,100 Germany Oct. 25, 1926 556,013 Germany Aug. 2, 1932 577,757 Germany June 3, 1933

Patent Citations
Cited PatentFiling datePublication dateApplicantTitle
US1713602 *Oct 17, 1927May 21, 1929Heiden JuliusKeyhole lock
US1819059 *Jun 15, 1929Aug 18, 1931Ernest SchmidSafety key for locks
DE436100C *Mar 4, 1925Oct 25, 1926Gustav RobinsohnSchlosssicherung
DE556013C *Oct 8, 1930Aug 2, 1932Karl KopatschekSchluessellochsperrer
DE577757C *Mar 23, 1932Jun 3, 1933Josef HerkrathSchluessellochsperrer mit geschlitztem, zylindrischem Sperrkoerper
Referenced by
Citing PatentFiling datePublication dateApplicantTitle
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
US7234326 *Sep 5, 2006Jun 26, 2007Miz Engineering Ltd.Lock device
DE1056503B *Oct 7, 1954Apr 30, 1959Willy SchieferSchluessellochsperrer
Classifications
U.S. Classification70/428
International ClassificationE05B17/16, E05B17/00
Cooperative ClassificationE05B17/16
European ClassificationE05B17/16