GB2306309A - 3 position handle for tilt-and-turn windows or doors - Google Patents

Abstract

A handle for a door or window comprises a grip 2 mounted for at least partial rotation on a base 1 fixed to the door or window. The grip 2 can be rotated successively from a first, closed position to a second "tilt" position and then to a third "turn" position. The grip 2 has a projection 9 which locates in an arcuate recess (20, Fig.15) in the base 1. The projection 9 can be turned from a first orientation, in which rotation of the gip 2 to third position is prevented, to a second orientation, in which such rotation is possible.

Description

Title: Handle This invention relates to a handle for a door or window, and in particular to a handle for a door or window of the "tilt-and-turn" varietv.

Tilt-and-tum windows are well-known. They are widely used for reasons of safety and security.

Such a window has a mechanism operated by a handle which can be rotated from a "closed" position to a "tilt" position, in which the window pivots about its lower edge, and then to a "turn" position, in which the window pivots about a side edge in the conventional wav. The "tilt" position provides ventilation whilst still preventing access through the window (providing security on ground floors and safety on upper floors). The "turn" position gives greater ventilation and access. eg for emergencv egress.

A disadvantage of known forms of tilt-and-turn window is that the window can be moved from the tilt position to the turn position relatively easily, resulting in lack of security or danger to. for example, children in the upper storeys of a building.

There has now been devised an improved handle for a tilt-and-turn window or door which overcomes or substantially mitigates this disadvantage.

According to the invention, there is provided a handle for a door or window, the handle comprising a base adapted for securement to the door or window, and a grip mounted on the base for at least partial rotation from a first position successively to a second position and a third position.

wherein the grip has a projection offset from the axis of rotation of the grip, which projection locates in a recess in the base, the projection being rotatable about its longitudinal axis from a first orientation, in which the projection engages a stop when the grip is in the second position so as to prevent rotation of the grip to the third position, to a second orientation. in which the projection does not engage the stop and rotation of the grip to the third position is permitted.

The handle according to the invention is advantageous primarily in that the handle may be rotated to the third position (which may be the "turn" position of a tilt-and-turn window) only after rotation of the projection to the second orientation. Such rotation of the projection is preferably by means of a suitable key, so that unauthorised or inadvertent rotation of the grip to the third position is effectively prevented.

Preferably, the recess is an arcuate channel in the base. Most preferably. the channel has a first width between the first and second positions of the grip and a second, lesser. width between the second and third positions. In such a case. the stop is the shoulder in the walls of the channel where the channel narrows from the first width to the second width.

The projection is preferably of substantially oval or rectangular cross-section such that it has two different transverse dimensions. Where the recess is a channel as described above, the transverse dimensions of the projection will be respectively greater than and less than the second width of the channel. Between the first and second positions of the grip, the projection is oriented such that its greater transverse dimension lies radially within the arcuate channel. Movement of the projection from the second position to the third position can only occur if the projection is rotated through 90" such that its smaller transverse dimension is oriented radially within the channel.

Most conveniently, the grip is moved through 90 between the first position and the second position, and through a further 90 to the second position. It is preferred that the arcuate channel as described above be a complete circle such that the same handle can be used in both righthanded and left-handed window assemblies.

Preferably. means are provided to lock the grip in the first position. Conveniently. such means comprise a locking detent housed within the base and locating in a recess in the grip. Such a detent may be biased into locking engagement with the grip, eg by a suitable resilient spring. To unlock the window, it is then first necessary to depress the locking detent and this may be achieved using a suitable key operated mechanism.

The invention will now be described in greater detail. by way of illustration only, with reference to the accompanying drawings, in which: Figure 1 is a side view of a tilt-and-turn handle according to the invention. in a closed position; Figure 2 is a plan view of the handle of Figure 1; Figure 3 is a view similar to Figure 1, but in section; Figure 4 is a view similar to Figure 3, but with a lock barrel depressed to permit the handle to be turned; Figure 5 is a sectional view on line V-V in Figure 4; Figure 6 is a sectional view on line VI-VI in Figure 4; Figure 7 is a view similar to Figure 5, but with the lock barrel rotated through 90 to a locked position; Figure 8 is a view similar to Figure 6. but with the lock barrel rotated through 90" to the locked position;; Figure 9 is a plan view of the handle, with the grip rotated through 90 , to a "tilt" position; Figure 10 is a sectional view along the line X-X in Figure 9: Figure 11 is a view similar to Figure 10 but with the lock barrel rotated through 90" to enable rotation of the handle to a "turn" position.

Figure 12 is a plan view corresponding to Figure 11; Figure 13 is a plan view of the handle. with the grip rotated through a further 90" to a "turn" position; Figure 14 is a sectional view on the line XIV-XIV in Figure l; and Figure 15 is a plan view of a base forming part of the handle of Figure 1, showing an annular recess.

Referring first to Figure 1, a handle for a tilt-and-turn window comprises a base 1 and a grip 2 mounted for rotation about a central raised boss portion 1 a of the base 1. The base I can be secured to the window by screws locating in holes 3 (indicated in Figure 1 by broken lines). In outward appearance, the handle is entirely conventional. When the handle is fitted to a window.

the grip 2 is connected by a suitable linkage, eg a spindle. to a conventional tilt-and-turn window operating mechanism housed within the window sash.

The handle can be locked and unlocked using a mechanism including a lock barrel 4 housed in a bore in the grip 2 and actuated by a key 5. The key 5 is shown only in Figures 1. 2. 9. 12 and 13, other Figures showing a key slot 15 into which the key 5 may be inserted.

As can be seen from Figure 3, a locking detent 6 which is housed in the base 1 is urged upwards by a resilient compression spring s. The detent 6 has an upstanding portion 6a which engages in a correspondingly shaped recess in the underside of the grip 2 and (in the configuration shown in Figure 3) prevents rotation of the grip 2. The body of the detent 6 bears against a projection 9 which is formed integrally with the lock barrel 4.

As can be seen in Figure 3. the lock barrel 4 is urged upwards to the position shown, by a compression spring 1 0. In this position. the window is closed but unlocked. To open the window, a user grasps the grip 2 and presses with his thumb on the top of the lock barrel 4. The barrel 4 moves downwardly (as viewed in Figure 3) to the position shown in Figure 4. In the latter position, the detent 6 is disengaged from the base of the grip 2 by the action of the projection 9, enabling the grip to be rotated to the position shown in Figure 9. As soon as the grip 2 is rotated from the position of Figure 2, the detent 6 is maintained in its downwardly depressed position by the underside of the grip 2. The user may then release the downward pressure on the barrel 4, which is raised by the action of compression spring 10.

The projection 9 is received (see Figure 15) within an annular recess or channel 20 in the base 1. In section. the projection 9 has the form of a rectangle with rounded ends. In its left-hand half (as viewed in Figure 15) the channel 20 has a width slightly in excess of the length of the projection 9 such that the projection 9 is closely received within it. In its right-hand half, the width of the channel 20 is reduced to a dimension slightly in excess of the width of the projection 9.

As described above, the grip 2 can be rotated through 90" to the position shown in Figure 9. In the course of this movement, the projection 9 travels along the wider portion of the channel 20.

When the grip 2 is moved into this position, the window operating mechanism housed in the window sash enables the window to "tilt" inwards about its lower edge. Further rotation of the grip 2 is prevented by abutment of the projection 9 with shoulders 21 at the junction of the wider and narrower portions of the channel 20.

In order to rotate the grip 2 further, first the window is ciosed and the key is then used to rotate the barrel 4. and hence the projection 9, through 90" (see Figure 12). In this orientation, the projection can travel along the narrower portion of the channel 20, enabling the grip 2 to be rotated to the position shown in Figure 13. Movement of the grip 2 to this position causes the window operating mechanism to adopt a configuration in which the window can be opened inwards on hinges at a side edge (ie to "turn").

Although the maximum range of rotation of the grip 2 is 180", it will be noted that the recess 20 is annular. This enables the same base component 1 to be used in installations in which the grip is to be rotated in opposite senses. It will also be noted that the narrower portion of the channel 20 is provided with a localised broadening 22. By rotation of the grip 2 to this position, and rotation of the projection 9, the handle may by locked in a slightly open. "night vent" position.

Rotation of the lock barrel 4 relative to the grip 2 is limited to a 90" range by a rib 30 (see Figures 6 and 8) which locates in an arcuate 90" recess 32 in the lock barrel 4. The barrel 4 is thus able to rotate only between two extreme orientations relative to the grip 2. In the first orientation, illustrated in Figure 3, the barrel 4 may be depressed and the grip 2 rotated to the "tilt" position (Figure 9). In that position. the barrel 4 may be rotated to its second orientation (see Figure 12) and the grip 2 rotated to the "turn" position (see Figure 13).

Rotation of the barrel 4 from one orientation to the other is accomplished using the key 5. The key 5 is inserted through the key slot 15 and the tip of the key 5 passes through a slot 25 in a spring-loaded disc tumbler 26 housed transversely in the lock barrel 4 (see Figure 5). The tumbler 26 protrudes under the action of a spring 27 from the lock barrel 4 and engages in a first recess 28 in the wall of the bore housing the barrel 4. When the key 5 is inserted it exerts a camming action on the tumbler 26, causing the tumbler 26 to be withdrawn from the first recess 28 and enabling the barrel 4 to turn. When the end of the range of rotation is reached. and the key 5 is withdrawn. the tumbler 26 is driven outwards by the spring 27 and engages in a second recess 29 (see Figure 7).

When the grip 2 is in the position shown in Figure 3, the handle may also be locked. In the locked condition, the barrei 4 cannot be depressed to release the detent 6 from the underside of the grip 2. The barrel 4 has a head 4a of enlarged diameter and downward travel of the barrel 4 is limited by abutment of the peripheral underside of the head 4a with a ledge 40 formed in the bore housing the barrel 4 (see Figure 4). The barrel 4 is also provided with a triangular projection 42 (see Figure 14) immediately below the head 4a. With the barrel 4 in the orientation of Figure 3, the projection 42 can travel within a correspondingly shaped recess 44 (see Figure 5) in the ledge 40. and the barrel 4 may therefore be depressed. If the barrel 4 is rotated through 90 , however, then depression of the barrel 4 is prevented by abutment of the projection 42 with the ledge 40. and the handle is locked.

Claims (10)

Claims

1. A handle for a door or window, the handle comprising a base adapted for securement to the door or window, and a grip mounted on the base for at least partial rotation from a first position successively to a second position and a third position, wherein the grip has a projection offset from the axis of rotation of the grip, which projection locates in a recess in the base, the projection being rotatable about its longitudinal axis from a first orientation, in which the projection engages a stop when the grip is in the second position so as to prevent rotation of the grip to the third position, to a second orientation, in which the projection does not engage the stop and rotation of the grip to the third position is permitted.

2. A handle as claimed in claim 1, wherein the recess is an arcuate channel in the base.

3. A handle as claimed in claim 2, wherein the channel has a first width between the first and second positions of the grip and a second, lesser, width between the second and third positions.

4. A handle as claimed in claim 3, wherein the projection has two different transverse dimensions which are respectively greater than and less than the second width of the channel.

5. A handle as claimed in any preceding claim, wherein the grip is moved through 90O between the first position and the second position, and through a further 90" to the third position.

6. A handle as claimed in claim 2, wherein the arcuate channel is a complete circle.

7. A handle as claimed in any preceding claim, wherein means are provided to lock the grip in the first position.

8. A handle as claimed in claim 7, wherein said means comprise a locking detent housed within the base and locating in a recess in the grip.

9. A handle as claimed in claim 8, wherein said detent is biased into locking engagement with the grip.

10. A handle substantially as hereinbefore described and as illustrated in the accompanying Figures.