LATCHES FOR PANELS

Abstract: A latch for a hinged panel (12) mounted in a frame (16), e.g. an opening roof for a vehicle, comprises a toggle link having a first element (20) pivotally connected to the panel and a second element (22) pivotally connected to the free end of the first element (20). An open-ended slot (28) in a free end of the second element (22) engages with a pivot pin (30) on the frame (16). A retention lever (40) of resilient material is pivotally mounted on the second element (20) and has a hook (38) arranged to engage with the pivot pin (30) to retain it in the slot (28). The resilience of the lever (40) retains the hook (38) in engagement with the pivot pin (30). It can be released by pressing on a projection (42) opposite the hook (38).

Description: Latches for Panels This invention relates to latches for panels intended to close an opening in a structure and more particularly to latches for panels of the foregoing type in which the panel is movable between a closed and a normal fully opened position but with provision for opening beyond the normal fully opened position. The invention is particularly, but not exclusively, applicable to opening roofs for vehicles of the kind ir. which a frame is provided for surrounding an aperture in the roof of a vehicle and a rigid panel, conveniently of glass, is hinged to the forward edge of the frame and is coupled to the rear edge of a latch which is releasable to enable the panel to be hinged into a normal open position. In such opening roofs, the hinges are frequently constructed so as to allow the panel to be completely removed from the frame and it is necessary to provide a latch which is also completely detachable. One type of latch which has hitherto been used in opening roofs of the foregoing type comprises an over-centre toggle link. In order to complete removal of the panel, one of the pivot pins of the toggle link takes the form of a removable bolt. It is necessary to unscrew such bolt to permit complete removal and this operation is time-consuming and inconvenient. The present invention is concerned with the provision of a latch which requires a relatively simple operation to permit removal. According to the invention, a latch for a hinged panel mounted in a frame comprises a toggle link having a first element connected to the panel by a first pivot pin, a second element connected to the frame by a second pivot pin and to the first element by a third pivot pin, the connection of one of said elements to one of its pivot pins comprising an open-ended slot in said element and a retention lever pivotally mounted on said element having a hook-like formation adapted to engage with said one pivot pin to retain it in the slot, the hook-like formation being provided with resilient means for biasing it into a position to inhibit movement out of its engaged position. The retention lever may conveniently be mounted on the other pivot pin connected to said one element. In one form of the invention the retention lever is formed of synthetic plastics material, the resilience of which serves to bias. the hook-like formation into said position inhibiting movement thereof out of its engaged position. An embodiment of the invention will now be described, byway of example, with reference to the accompanying drawings, in which: Figure 1 is a perspective view of the top of a motor car fitted with an opening roof of the type referred to above, Figure 2 is a cross-sectional view of a latch in accordance with the invention fitted to the opening roof illustrated in Figure 1, the latch being in the closed position, Figure 3 is a cross-sectional view similar to Figure 1 but with the opening roof in its normal open position and with the hooklike formation released prior to complete removal of the panel, and Figure 4 is a cross-sectional view, similar to Figures 2 and 3 but just after separation of the two parts of the latch from one another. Referring to Figure 1, a motor car 10 has an opening roof comprising a panel 12 hinged along its leading edge 14 to a frame 16. bounding an aperture in the roof of the vehicle 10. The hinges (not shown) are constructed so as to permit the panel 12 to be unhooked after it has been opened well beyond its normal open position, as shown in Figure 1. A latch 18 at the rear of the panel 14 is arranged to hold the panel 12 either in the normal open position as illustrated or in the fully closed position and also to allow complete removal of the panel 12. Referring to Figures 2, 3 and 4, the latch 18 comprises a first toggle link 20 and a second toggle link 22. 'The toggle link 20 is pivotally connected, by a pin 24 to a base member 26 which is attached to the panel 12. The other toggle link 22 is connected to the toggle link 20 by a pivot pin 26. The toggle link 22 also has a slot 28 (Figures 3 and 4) which, when the panel 12 is in its fully closed or normal open position, engages with a pivot pin 30 mounted on a bracket 32 which is attached to the rear edge of the frame 16. The frame 16 also carries a resillient seal member 34 which, when the panel is in its closed position, urges the latter upwardly and provides the necessary resillience against which the toggle mechanism of the latch 18 goes over-centre. The link 22 has an elongated end portion which provides an operating handle 36 for opening and closing the panel 12. In normal operation, the pivot pin 30 is held in position in the slot 28 by a hook-like formation 38 on a retention lever 40 which is pivotally mounted on the pin 26. The retention lever 40 is formed of plastics material, the resillience of which is sufficient to hold the hook-like formation 38 in engagement with the pivot pin 30 while permitting it to be snapped out of and back into engagement. A projection 42 opposite to the hook-like formation 38 provides a fingergrip which can be used to cause flexing of the lever 40 to permit disengagement of the hook-like formation 38. In normal operation, the panel 12 can be moved between its closed and its normal open position merely by operation of the handle 36. When complete removal of the panel 12 is required, it is first opened to its normal open position. Next, by pressure on the projection 42, the hook-like formation 38 is disengaged to bring the mechanism into the configuration illustrated in Figure 3. The link 22 can now be separated from the pivot pin 30, as shown in Figure 4 and the panel 12 further opened to an angle at which the hinges (not shown) at the leading edge 14 (Figure 1) thereof can be unhooked. The force exerted on the pivot pin 30 due to the resillience of the retention lever 40 is sufficient to prevent rattling between the pin 30 and the link 18, thereby avoiding the need to take other precautions against rattles at this location.

Claims: CLAIMS 1. A latch (18) for a hinged panel (12) mounted in a frame (16), comprising a toggle link having a first element (20) connected to the panel (12) by a first pivot pin (24), and a second element (22) connected to the frame (16) by a second pivot pin (30) and to the first element (20) by a third pivot pin (26), characterised in that the connection of one of said elements (22) to one of its pivot pins (30) comprises an open ended slot (28) in said element (22) and a retention lever (40) pivotally mounted on said element (22) and having a hook-like formation (38) adapted to engage with said one pivot pin (30) to retain it in the slot (28), the hook-like formation (38) being provided with resilient means for biasing it into a position to inhibit movement within its engaged position. 2. A latch according to claim 1, characterised in that the retention lever (40) is mounted on the other pivot pin (26) connected to said one element (22). 3. A latch according to claim 1 or 2, characterised in that the retention lever (40) is formed of synthetic plastics material, the resilience of which serves to bias the hook-like formation (38) into said position, inhibiting movement thereof within its engaged position. 4. A latch according to claim 1, 2 or 3, characterised in that the pin (30) which is engaged by the slot (28) is mounted on the frame (16).

Inventors: FISHER, SIDNEY EDWARD
Applicants: BRITAX WEATHERSHIELDS LIMITED
Application year: 1981
Main classification: E05C19
IPC codes: B60J7