US3188127A - Door lock - Google Patents

Description

June 8, 1965 J. H. HAZES 3,183,127

. DOOR LOCK Filed Feb. 18, 1963 2 Sheets-Sheet 1 ATTORNEYS June 8, 1965 J. H. HAZES I 3,183,127

DOOR LOCK Filed Feb. 1a, 1963 2 Sheets-Sheet 2 FIG.3 FIG-6 BY wu M ATTORNEYS United States Patent .0

3,188,127 DOOR LOCK Johannes Hendricus Hazes, Amsterdam, Netherlands,

assignor to N.V. Ahrend-Libra, Amsterdam, Netherlands, a corporation of the Netherlands Filed Feb.18, 1963, Ser. No. 259,159 Claims priority, application lilzeherlands, Feb. 22, 1962, 9 Claims. ((Il. 292-224) This invention relates to a lock comprising a rotatable lock bolt adapted to be actuated by handles, to which bolt there is secured a shaft rotatable about its longitudinal axis and being equipped with a spring tending to keep said bolt in the locking position, said shaft comprising at least one cam adapted to be actuated by an actuating member from outside the lock casing through a recess in said lock casing.

The invention aims at providing a lock of this kind adapted to be actuated with the aid of rotatably mounted handles. For this purpose the lock according to the invention is characterized in that the actuating member is slidably arranged on the connecting rod of the handles which are rotatably mounted in door rosettes, said member comprising at its one end a cam cooperating with the shaft cam and at its other end one or more cams cooperating with one or more fixedly arranged cams. In consequence of the fact that the actuating member is provided on both sides with cams which are offset relative to each other the handle needs only to be turned over a small angle in order to bring the shaft cam from its one position into its other position. Moreover, the angles of inclination of the cams may be smaller and thus a smaller force is required for turning the handles.

The actuating member is preferably spring-biased. This spring also moves the handles into their initial position so that this need not be done anymore by the shaft cam. Consequently the spring which rotates said shaft cam and therefore also the bolt may be of considerably weaker construction than in case said spring would have to serve not only for rotating the bolt but also for returning the handles into their initial position.

The fixedly arranged cams co-operating with the cams of the actuating member may be provided on a door rosette. If desired they may be integral therewith.

In order to make the angles of inclination of the cams as small as possible it is necessary that the end of the shaft cam follows the smallest possible path. In order to ensure this said shaft cam is preferably located within the circumference of the lock casing.

According to the invention the surface of the shaft cam co-operating with the actuating member may be chamfered so that it is in close contact with the surface of the cam of the actuating member co-operating therewith.

A preferred embodiment is characterized in that the actuating member and the spring are mounted in a sleeve provided with fixing means for the lock easing, into which casing also the cam or cams of the door rosette project. Thus it is accomplished that the actuating member contacts the shaft cam always in the same way which assists in making the shaft cam as short as possible. It is preferred to apply a cylindrical construction both for this sleeve and for the lock casing. V The invention will be further explained below with reference to the accompanying drawings showing by way of example an embodiment of the lock according to the invention.

FIG. 1 shows a longitudinal section'of a lock according to the invention mounted in a door, the handles being partly shown.

FIG. 2 is a section according to the line II-II of FIG.

1 without the door casing.

3,188,127 Patented June 8, 1965 FIG. 3 is a section according to the line IIIIII of FIG. 1.

FIG. 4 shows the actuating member in perspective.

FIG. 5 is a section of a door rosette provided with cams.

FIGS. 6 and 7 show a detail. 1

In the drawings reference numeral 1 denotes a door casing and reference numeral 2 indicates a door. In the door casing 1 there has been arranged a plate 4 with the aid of screws 5, said plate being provided with a locking pin 3. 'A rotatable lock bolt 6 of a lock mounted in the door -2 co-operates with said locking pin 3. a

The lock mounted in the door comprises a cylindrical lock casing 7 in which a shaft 8 connected to the bolt 6 is rotatably mounted in bearings 9, 10. This shaft is equipped with a spring 11 tending to maintain the lock bolt in the position in which the door is locked. On the shaft 8 there is secured a cam 12 facing a recess 13 of the lock casing 7. This shaft cam 12 is so dimensioned that it is situated inside the circumference of the lock casing 7. The lock casing comprises two slots 14 with which two bent lips 15 of a cylindrical sleeve 16 are in engagement. In this way the lock casing is fixed relative to said sleeve. The cylindrical sleeve 16 comprises a recess 17 facing the recess 13 of the lock casing 7. A square connecting rod 18 of two handles 19 passes through the sleeve 16, said handles being rotatably mount ed in two door bearings 20 and 21. On this connecting rod 18 an actuating member 22 comprising a square hole and destined for the shaft cam 12 is slidably but nonrotatably mounted, said actuating member being biased by a spring 23 which tends to keep said actuating member in a position in which the shaft cam 12 may freely move into the position in which the bolt assumes the locking position.

The actuating member 22 is at one side provided with a cam 24 with an oblique running-on surface 25 for the end of the rotatable shaft cam 12, said end being correspondingly chamfered so that it is in close contact with the running-on surface 25. The other end of the actuating member 22 comprises a number of cams 26 co-operating with correspondingly chamfered earns 27 of the door bearing 20.

The above-described lock operates as follows:

If one of the handles 19 is turned the cams 26 and 27 will slide along each other so that consequently the operating member 22 on the connecting rod 18 of the handles 19 is displaced. As a result thereof the cam 24 located at the other side of the actuating member 22 will turn the shaft cam 12. Since, however, when turning the handles 19 the actuating member 22 is turned, the end of the shaft cam 12 will, moreover, run up along the running-on surface 25 of the cam 24 so that the end of the shaft cam 12 is given an additional rotary movement. As a consequence of the fact that the shaft cam 12 is rotated also the shaft 8 and the bolt 6 secured thereto are rotated until the bolt is in the unlocked position. If in this position the handle is released the spring 23 will move the actuating member 22 back into its initial position so that the cams 26 and 27 slide along each other until the handles 19 are again in their initial position. At the same time the cam 24 of the actuating member returns into its initial position so that the spring 11 turns the shaft cam 12 back into its initial position. It is obvious that both movements are carried out simultaneously.

It is obvious that the invention is not restricted to the embodiment described above and shown in the drawings but that it may be modified in many ways without departing from the scope of the invention. Instead of providing five actuating cams 26 and 27 on the actuating for example also two of such cams.

r 7 9 Furthermore, the actuating member 22 (see FIG. 4) may also be provided with abutments 2.8 which co-operate with abutments 29 of the sleeve 16 (FIGS. 6 and 7) and prevent the handles from being turned too far.

I claim: l

1. A door lock comprising a rotatable lock bolt, a rotatable shaft secured to said lock bolt, a spring cooperating with said shaft urging said bolt to locking position, a casing surrounding said shaft having a recess, a cam upon said shaft projecting into said recess, an actuating member located outside said casing cooperating with is provided on said door for said handles and said fixed cam is provided on said bearing.

3. A door lock according to claim 1, in which said actuating member and said biasing spring are mounted in a sleeve connected to said casing and said fixed cam projects into said sleeve.

4. A door lock as set forth in claim 3 wherein said actuating member is provided with an abutment and said sleeve is provided with abutments cooperating with said abutment on said actuating member.

5. A door lock according to claim 3 in which said cam on said shaft projects withinthe circumference of said sleeve.

References Cited by the Examiner UNITED STATES PATENTS 2,355,449 8/44 Lakin 292336.3 2,573,028 10/51 Kramer 292-336.3

M. HENSON WOOD, JIL, Primary Examiner.

Claims (1)

1. A DOOR LOCK COMPRISING A ROTATABLE LOCK BOLT, A ROTATABLE SHAFT SECURED TO SAID LOCK BOLT, A SPRING COOPEATING WITH SAID SHAFT URGING SAID BOLT TO LOCKING POSITION, A CASING SURROUNDING SAID SHAFT HAVING A RECESS, A CAM UPON SAID SHAFT PROJECTING INTO SAID RECESS, AN ACTUATING MEMBER LOCATED OUTSIDE SAID CASING COOPERATING WITH SAID CAM THROUGH RECESS, A ROD UPON WHICH SAID ACTUATING MEMBER IS SLIDABLY AND NON-ROTATABLY MOUNTED, A SPRING BIASING SAID ACTUATING MEMBEER, DOOR HANDLES MOUNTED ROTATABLY IN A DOOR UPON THE ENDS OF SAID ROD, A FIXED CAM UPON SAID DOOR, SAID ACTUATING MEMBER HAVING A CAM COOPERATING WITH SAID CAM UPON SAID SHAFT AT ONE END AND AT ITS OTHER END HAVING A CAM COOPERATING WITH SAID FIXED CAM.

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