GB2232194A - Spring-bolt fastening for doors - Google Patents

Description

4 1 SPRING-BOLT FASTENING FOR DOORS.

:L -::3 -tl The present invention relates in general to mechanisms for the closure of doors and more particularly to a fastening with a spring-biassed catch, lock or bolt which is held in its operating position by means of a spring and which can be displaced into an inoperative position by mechanical means.

At the present time, in the most common and widely used door locks the spring bolt is displaced from the operating lacking position in which the door is closed to the withdrawn position for opening the door by means of handles which move angularly or by means of knobs which rotate about a horizontal axis passing through the spring lock, the handles or the knobs engaging the bolt by means of a square shaft or the like through their movement. Such locks may also be is provided with key locking means which prevents movement of the handles or knobs or which immobilises the door by means of at least one bolt which is placed parallel to the bolt. When the lock is provided with both a spring biassed bolt and a normally displaceable bolt orcatch such as a deadlock, in a single housing, the mechanism is fairly complex and bulky, and its mounting an doors can become a problem, as is well known to those skilled in the art, in particular in the case of doors constructed of metal sections.

An object of this invention is to provide a fastening for doors, together with a key locking device, which is particularly simple, of reduced size, convenient to operate and which can also be used for fastenings such as metal fastenings where the space available for incorporating the lock is limited.

Another object of the invention is to provide a fastening for doors using levers which pivot on vertical or other axis pins in order to control the spring bolt unlike the 2 traditional handles or knobs with a horizontalaxis, the said levers-being mounted an fixed supports applied to the inside and outside or opposite faces of a door.

According to the present invention there is provided a fastening for doors of the type having a spring-biassed lock or bolt biassed into an operative position by means of a spring which is capable of being displaced into an inoperative position by mechanical means, with the bolt being guided in a guide body having a transverse opening corresponding to transverse openings made in the door to which the fastening is to be fitted, characterised in that two rocking or pivotable levers with perpendicular or substantially perpendicular axes or otherwise extending axes are mounted is on two fixed handle supports applied to first and second faces of the door, each of which levers are engageable directly or indirectly with the bolt in order to enable it to be displaced against the action of the corresponding spring, the lever an one handle support being displaceable independently of that an the other support, and each pivotable lever being capable of being immobilised or locked by at least one key cylinder mounted on the handle support.

The present invention will be described further, by way of example, with reference to the accompanying drawings, in which: - Fig. 1 is a perspective view of a fastening device according to a first embodiment of the invention applied to a door; 31) Fig. 2 is a horizontal cross-section of the fastening assembly of Fig. 1; Fig. 3 is a longitudinal section along the arrows III-III of Fig. 2, showing the spring biassed bolt or lock; 1 3 Fig. 4 is a transverse cross-section across the springlock along the arrows IV-IV in Fig. 2; Fig. 5 is a cross-section similar to that in Fig. 3, but with a different arrangement of the levers with respect to the spring lock; Fig. 6 is a partially sectionalised plan of a varient means of lacking.

Figs. 7 and 8 are two partial views of a modified device illustrating two different arrangements of the key cylinder in comparison with that shown in Figs. 1 and 2; and Fig. 9 is a cross-section through an alternative embodiment of a similar fastening device suitable for knobs.

In the drawings a fastening spring biassed bolt or lock 10 is housed and guided in a body 11 which is inserted into a recess in the thickness of a door 13 and is secured by means of screws 12 in end flanges of body 11 to door 13 which closes against a door jamb 14, see Fig. 2. Spring lock 10 is biassed by a spring 15 which normally holds it in the forward or extended position, projecting from guide body 11, to engage a striking plate 16 attached to jamb 14 when the door is closed. Spring lock is withdrawn into the inoperative position against spring 15, in order to open the door, by means of a device which will now be described in relation to an outside face A and an inside face B of the door.

is 4 Two fixed handles 17, 1B each having a cavity 171,161 are mounted on the two faces A, B of door 13, axially with respect to transverse openings made both in the door itself and in the guide body 11 of spring lock 10.

A racking lever 19, of substantially L-shape, rotatable about a vertical axis pin 20 is mounted in the cavity 171 of handle 17 an outside face A of the door. The lever 19 has a first arm 21 which projects from handle 17 towards the door, approximately parallel thereto, and a second arm 22 which is angled towards spring lock 10. This second arm 22 extends into the transverse openings of the door and guide body 11 and has a terminal part 221 of circular configuration which engages spring lock 10, more particularly against a shoulder 23 made in the said spring lock in a recess thereof on the side adjacent spring 15. Thus when handle 17 and lever 19 are grasped, the first arm 21 of lever 19 may be displaced into cavity 171 in the handle in the direction of arrow Fa in Fig. 2 causing spring lock 10 to be displaced rearwards into the inoperative position against spring 15 in order that the door can be opened.

A rocking lever identical to and having the same function as that mounted on the outside handle may also be mounted in cavity 161 of handle 1B an the inside face B of the door so that the spring lock can thereby be displaced and the door can be opened in the same way from both the inside and the outside.

More preferably, however, and as shown in the drawing, a different operating leverage is mounted on inside handle 18 of the door. In fact a rocking lever 24 pivotable about a vertical axis pin 25 and having a first arm 26 which projects frontally from handle 18, away from the door, and a second arm 27 which is turned back towards spring lock 10 is mounted in cavity 181 of handle 16. This second arm 4 27 does not engage the spring lock directly but engages the adjacent end 281 of a displacement re-direction lever 29, which is rotatably mounted about a vertical pin 29 and has an opposite end of circular configuration 2811 which passes through the opening of the door and the guide body, engages spring lock 10, and more specifically a shoulder 30 made in the said spring lock on the side of spring 15 in the same way as lever 19 mounted an outside handle 17.

is Here again, when handle 18 and lever 24 are grasped the first arm of lever 24 may be displaced in the direction of arrow Fi causing the spring lock to be withdrawn, rearwards by means of lever 28 in order to open the door.

It will be noted also that end 221 of lever 19 and end 2811 of displacement re-direction lever 28 which engage with spring lock 10 may be superimposed an each other as sh" in Figs. 2, 3 and 5 of the drawing or coordinated with two opposite faces of the spring ock as in the variant in Fig. 4. In each case the levers are independent and while end 2811 of diverting lever 28 may be placed in a recess of corresponding size made in spring lock 10, end 221 of lever 19 is placed in a recess of larger size in the spring lock in order to allow the spring lock to operate and the door to be opened from the interior by means of lever 2B even when lever 19 on the outside is immobilised.

At least one key cylinder 33, which is in itself-known, may be mounted an each handle 17, 18 in order to immobilise rocking levers 19, 24 and make it impossible for these to move, and therefore for the spring lock to be operated when the door has to be safely locked in the closed position.

In the illustrations in Figs. 1 and 2 key cylinders 33 are placed at the free end of each fixed handle. As an alternative key cylinders 33 may be placed at the other end c 1 6 of the handles or at both ends of the handles as illustrated in Figs. 7 and 8 respectively.

Finally it should be noted that a safety tooth 34 which is integral with lever 28 as illustrated in Fig. 2, or a slot catch 34, see Fig. 6, which can be displaced into an inoperative position at a distance from the diverting lever and into an operating position to intervene between the diverting lever and an adjacent side of the handle may be provided in order to immobilise diverting lever 28 in inside handle 16 and prevent spring lock 10 from being displaced and tampered with from the outside.

Changes of detail and further provisions may be made to the assembly described above without going beyond the scope of the invention. For example, biassing means other than springs may be used or the same device may also be applied to knobs which are dimensioned and conveniently house the levers as illustrated in Fig. 9, in which identical numerical references indicate members equivalent to those in the other figures.

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Claims (7)

1. A fastening far doors of the type having a springbiassed lock or bolt (10) biassed into an operative position by means of a spring (15) which is capable of being displaced into an inoperative position by mechanical means, with the bolt (10) being guided in a guide body (11) having a transverse opening corresponding to transverse openings made in the door to which the fastening is to be fitted, characterised in that two racking or pivotable levers (19, 24) with perpendicular or substantially perpendicular axes or otherwise extending axes are mounted on two fixed handle supports (17, 18) applied to first and second faces of the door, each of which levers (19, 24) are engageable directly or indirectly with the bolt (10) in order to enable it to be displaced against the action of the corresponding spring (15), the lever an one handle support being displaceable independently of that on the other support, and each pivotable lever (19, 24) being capable of being immobilised or locked by at least one key cylinder (33) mounted on the handle support (17, 18).

2. A fastening for doors according to claim 1, in which each fixed handle support (17, 18) has a cavity (171, 181) open on one side, in which cavity in each support is mounted one vertical axis pivotable lever (19, 24) having a first arm which projects from the open side of the said cavity and a second arm angled towards the spring lock (10), this second arm, in use, extending through the transverse openings in the door and in the guide body and engaging with a shoulder (23, 30) of the bolt (10) an the side of the thrust spring (15).

3. A fastening for doors according to claim 1, in which each fixed handle support (17, 18) has a cavity (171, 161) open k 8 is on one side in which a vertical axis lever (19) having a first arm (21) which projects from the cavity of the handle towards the door and a second arm (22), in a position of use, passing through the transverse openings in the door, and in the guide body and engaging a shoulder (23) made in the bolt (10) is mounted in one handle support (17) and in which one vertical axis pivatable lever (24) having a first arm (26) which projects from the handle away from the door and a second arm (27) which engages one end of a diverting lever (28) which rotates about a vertical pin (29) and whose opposite end extends into the transverse openings in the door and the guide body and engages against a shoulder (30) made in the spring lock is mounted an the other handle support (18).

4. A fastening for doors according to claim 2 or 3, in which the operating end (221, 2811) of each lever (19, 2B) engaging with the spring lock (10) has a circular configuration, the said lever ends being superimposed on each other or on two opposite sides of the bolt.

5. A door fastening according to claim 4, in which the operating end (221) of pivatable lever (19) an handle support (17) on the outside of the door is seated in a recess in the-bolt having a width greater than that of the end itself, while the operating end (2811) of the pivotable lever (19) or re-directing lever (28) corresponding to the support or handle an the second face or inside of the door is seated in a recess in the spring lock having a width equal to that of the end itself.

6. A door fastening according to one of the foregoing claims, in which a safety tooth (34) or catch (35) is associated with the pivotable lever (24) and/or the redirecting lever (28) on the handle support on the second face or inside of the door.

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7. A door fastening according to one of the foregoing claims, in which key cylinders (33) mounted at one or both ends of each fixed handle support are provided in order to immobilise each rocking lever (19, 24) and thereby immobilise the spring lock.

A fastening for doors substantially as hereinbefore described with reference to the accompanying drawings.

I Published 1990atThePateiit Office, State House. 66 71 High Holborn.Lond-. r.WClR4TP- Further copies maybe obtained from The Patent Office. Sales Branch, St Mary Cray, Orpington, Kent ER5 3RD. Printed by Multiplex techniques Itd, St Mary Cray, Kent, Con. 1/87