IL44896A - Bolt lock for doors or flap closures of furniture - Google Patents

Description

A bolt look for doors or flap closures of furniture A bolt lock for doors or flap closures of furniture,. The present invention relates to a bolt lock for doors or flaps which comprises a casing to be attached with its bottom wall to the inside of a iloor or a flap and having an excenter disc which is seated rotatably in the said bottom wall the said disc being provided with means for "the engagement by a key and further comprising a bolt movable slidably within the casing such bolt being in the form of a flat spring pretensioned towards the said excenter disc and having a cross slot through which passes an excentrical pin of the excenter disc.

·, One of the known locks of the kind- referred to above comprises a rigid locking bolt, say of a piece of flat steel and a corelated arresting spring to ensure the position of the bolt in its closing or locking position. Such an arrangement already has the advantage of reduction of the composite parts and a simplification of the construction. It has been suggested also in the known construction of the. above kind that the problem of the protection against corrosion of the casing could be solved thereby that the top wall of the casing be formed as a lid, separate from the main part of the casing, such lid being connectable with the side walls of the casing by means of claw like projections insertable into the side walls of the casing starting from the rear end thereof; the rear end of the lid in the inserted position being folded back against the rear wall rising from the bottom wall of the casing. This arrangement of the casing permits joining together of the locking means after having welded the main portion of the casing to the door or to the flap to whiih it is to be attached, followed by a subsequent treatment for protection against corrosion of the welded parts, e.g. by plating with zinc or cadmium.

However, it has been found that in the known , locking means of the kind referred to, the required securing of the lid by folding over its hind ends, especially in those cases where no skilled personnel was available, was most difficult to achieve and it was effected lyither in an unsufficient degree or it caused a deformation of the lid as a whole. Furthermore, the proper bending over of all four edges of the lid requires a considerable length of time and furthermore there is always the danger of damage of the upper face of the corrosion protection layer, which in turn would lead to undesirable formation of rust.

It is the object of the present invention to create a locking means of the kind referred to at the beginning of this description, whereof the assembly can.be performed after welding the casing to a.door or a flap and wherein the subsequent treatment for protection against corrosion is much simpler and can be performed in a much quicker way, without any likelihood of damage of the anti-corrosion layer. According to the invention this problem is solved thereby that the face of the excentric disc directed towards the spring is formed as a bulge, the casing within the range of the excentric disc is open at its rear and further thereby that the excentric pin- is press fitted into a bore of Thereby that the face of the disc is formed as a bulge combined with the open side at the rear of the ' casing, the necessity of providing a removable lid of the casing is no longer existent, and the flat spring forming the lock bolt can be inserted into the casing which had already been welded to the door or flap after treatment against corrosion, by slipping it inwardly from the side of the casing, the rear opening of the casing permitting a bending of the spring into its pre-tensioned condition. Subsequently it will be necessary only to bring into register the cross slot of the spring with the bore of the excenter disc and to press the excenter pin into the bore which can be achieved by knocking on it with a hammer. Thus the assembly of the closure is performable quickly and even by unskilled labour and the fact that the pins can be inserted by a simple knock, such pin consisting preferably of material which is resistant to corrosion, eliminates the danger of harm to the casing.

According to a first feature of a preferable is a leaf spring embodiment of the invention, the spring /which in non-tensioned condition is flat and is set off in a known manner at its end. At that end it is provided-by slitting the leaf -with a non set off tongue by means of which the spring in the open position of the lock supports itself on the for abut^me t o-f- the spring at the exit side thereof. In this connection, it is especially preferable to provide said tongue in the median line of the spring and to create it by a U-shaped slit in front of the end of the spring. A thus formed tongue and so positioned possesses much greater elasticity as compared with the ¾iajor portio of the spring and diminishes the tensional power of the spring in its open position of the lock, whereby the function of the and operation of the lock is facilitated. On the other hand, in closed position, //the full ' elasticity in the non-slitted portion of the spring is retained and the necessary closing pressure of the spring against the inner side of the door or flap is ensured, so tha rattlin in the closing position will be prevented* According to another feature of a preferable embodiment of the invention, the casing is of U-shaped cross section and the legs of the U-profile forming the side wall of the casing are traversed in front and behind of the excenter disc by ¾iins which form abutments for the tensioning of the spring. In such an arrangement of the lock, the lid of the casing can be dispensed with since the opening which is required for insertion of the excenter pin and the spring is already present.

The assembly of the lock, after having,welded the casing to the door which is to be subjected to anti-corrosion treatment, is performed according to the invention in such a manner that the casing is welded to the door or flap whereupon the door or flap including the casin is first surface treated, after which treatment the excenter disc and finally the spring is inserted into the casing and eventually the excenter pin is forced into . the bore of the excenter disc after that bore had been brought into register with the cross slot of the spring.

A practical embodiment o the closure according to the invention will now be described in connection with the drawing. In the accompanying drawing, Fig. 1 is a plan view of the lock, Pig.2 is a frontal view and Fig.3 is an axial section on line III—IIII of Fig.1.

The bolt lock according to the invention which Is shown in the drawing consists of a casing having U-shaped cross section, such casing being indicated by the numeral 10 and having a bottom 11. The casing f rv-ther has two symmetrically extending. side walls 12a and 1 2b. The side walls 12a and 1 2b extend beyond bottom 1 1 at one end as can be seen in Big.3 · In the bottom 1 1 is provided a circular aperture 1 3 into which is set an excenter disc 1 4 having a set off lower portion 1 5.

This latter is inserted into the said aperture and is turnable therein. The set off portion 1 5 is provided with a triangular boss 16 which enters into a circular opening 1 7 of a door or flap 18. The aperture 1 7 in the door or flap is preferably of the same diameter or slightly larger than the aperture 1 3 in the bottom 1 1 so that friction is prevented between the portion 1 and the excenter disc 1 4 and the door or flap 18. The triangular boss 6 is intended to enter the recess in a. key which is designed to operate the lock.

As can be gathered further from Fig.3 , the upper side of the excenter disc 1 4 indicated by 1 9 is upwardly bulging and is provided with an excentcic blind bore 20 into which an excenter pin 21 is press fitted. Two headed pins or bolts 22 and 23 extend through pair-wise registering bores in the side walls 1 2a and 1 2b of the casing and are secured in position by upset ends. The headed bolts 22 and 23 form abutements for the spring which is positioned between the said bolts and the bulging upper side 19 of the disc. This spring 24 which is formed into a fiat bow and pretensioned forms the locking bolt of the bolt lock. The spring 24 is provided with a cross-wise extending slot 25. This slot engages the excenter pin 21. The end of the spring 24 directed towards the frame 26 of the door or flap 18 is set off towards the inner side of the.frame and contains a tongue 28 formed by a U-shaped slit 27 provided towards the end of the spring. Whenever the. flat spring 24 forming the locking bolt is shifted by means . of the turning of the excenter disc 14 from the position shown in Pigs 3 and 1 (being in the closing position) to the left hand side of the drawing, the tongue 28 slides on the pin 23 and forms the support of the spring against the bolt 23. In view of the fact that the tongue 28 is much narrower . than the spring itself, with the opening of the lock the tension of the spring is diminished and thus the mo ement of the spring in the open position is facilitated.

; The locking arrangement just described comprises four elements which can be supplied in dissassembled state, · i. e. the casing 10 with the two headed bolts 22 and 23 the excenter disc 14 with the triangular boss 16 the flat spring 24 the excenter pin 21.

In view of the fact that the whole lock can be supplied in disassembled state, the casing 10 can be welded to the door or flap prior to its treatment against corrosion and subsequently the treatment ma be performed by galvanization or cadmium plating. In the next step the excenter disc 1 with its portion 15 is inserted into the aperture 13 in the bottom 11 of the casing, and the spring 24 is slid in from one or the other end of the casing, it being shifted in position with pressure under the second abutement whereby it is tensloned. In this position of tension the spring 24 prevents the disc .14 from dropping out from the opening 13.

Claims (6)

44896/2 J WHAT IS CLAIMED IS:

1. A bolt lock for doors or flap closures of furniture comprising a casing to be attached with its bottom wall to the inside of a door or a flap and having an excenter disc which is seated rotatably in the said bottom, wall, the said disc being provided with means for the engagement by a key and further comprising a bolt movable slidably within the casing such bolt being constituted by a flat leaf spring pretensioned towards the said excenter disc and having a cross slot through which passes an excentrical pin of the excenter disc characterised thereby that the face of the excentric disc directed towards the spring is formed as a bulge, the casing within the range of the excentric disc is open at its rear and further thereby that the excentric pin is press fitted into a bore of the excenter disc.

2. Bolt lock as claimed in claim 1 characterised thereby that the said leaf spring which in non-tensioned condition is flat and is set off in a known manner at its end, is provided at that end with a non set off tongue by slitting the leaf by means of which tongue . the spring, in the open position of the lock, supports itself on an abutment for the spring at the exit side thereof.

3. Bolt lock as claimed in claim 2, characterised thereby that the said tongue is positioned in the median line of the spring and is created by a U. shaped slit in front of the end of the spring. as cl aimed i n clai m T ,

4. Bolt lock /characterised thereby that the casing is of U-sliaped cross section and the legs of the U-profile forming the side wall of the casing are traversed in front and behind . of the excenter disc by pins which forms abutments for the

5. * Method for assembling the look claimed in the preceding claims to a door or flap Which after welding of tho lock easing is subjected to anticorrosive treataent, characterised thereby that first the oasing is welded to tho floor or flap whereupon the door or. flap including the casing is first surface treated, after which treatment the excenter disc and finally the spring is Inserted into the casing and eventually the excenter pin is forced into the bore of the excenter disc after that bore had been brought into register with the sross slot of the . spring*

6. A bolt lock substantially as hereinbeofre fiescribed and sliown in the annexed