Housing Cover For A Mobile Phone

March 05, 2008
CA 2623324
2008-03-05

ABSTRACT
A sliding cover without a latching mechanism, especially for closing the battery compartment of a mobile phone. The cover is guided by the opposing grooves provided in the housing of the mobile phone. Retaining of the cover is achieved by using a friction spring applying force perpendicular to a sliding edge of the cover and in the direction of the plane of the cover. This arrangement allows use of unconventional materials such as sapphire glass for the cover.

CLAIMS(8)
1. A cover, for sliding on and off a mobile phone body, comprising a plate, said plate having at least two parallel guiding edges, each said edge defines at least one chamfer surface, said surface slidingly fit corresponding groove of the phone body, wherein the plate is restrained in the direction perpendicular to the plate while said edges are engaged in the grooves of the body.
2. A cover as claimed in Claim 1, wherein said guiding edge defines two symmetrical chamfer surfaces.
3. A cover as claimed in Claim 1, wherein said guiding edge defines concave or convex surface.
4. A cover as claimed in Claims 1 to 3, wherein at least one edge has a concave detent.
5. A mobile phone, having a cover slid thereto, said cover comprising:
a plate, said plate having at least two parallel guiding edges, each said edge defines at least one chamfer surface, said surface slidingly fit corresponding groove of the phone body, wherein the plate is restrained in the direction perpendicular to the plate while said edges are engaged in the grooves of the body.
6. A phone as claimed in Claim 5, wherein said guiding edge defines two symmetrical chamfer surfaces.
7. A phone as claimed in Claim 5, wherein said guiding edge defines concave or convex surface.
8. A phone as claimed in Claims 6 to 7, wherein at least one edge has a concave detent.

DESCRIPTION
HOUSING COVER FOR A MOBILE PHONE
FIELD OF THE INVENTION
The present invention relates to a housing of a mobile phone and, more particularly, to a back cover for a mobile phone.

BACKGROUND OF THE INVENTION
Back cover for a mobile phone is required to service the battery and also to access other components of the phone such as SIM card. The access is typically intended to be performed by the user of the phone and therefore the cover needs to be easy replaceable and the retaining mechanism needs to be reliable. In the present mobile phones these requirements lead to all sorts of latching mechanisms which occupy the valuable space in the phone. Furthermore, the latching mechanisms of the cover and the mating portion of the housing in many cases impact the architectural design of the phone housing. Not only is the design freedom impaired but the choice of materials is also limited. Advanced materials such as flat and scratch resistant sapphire are difficult to apply.

SUMMARY OF THE INVENTION
The present invention overcomes the foregoing and other drawbacks by constructing the housing cover as a plate which fits opposing grooves in the phone housing.
The convenient design of the groove is V shape and the sliding edges of the plate are chamfered to fit the V groove. In a typical operation the plate is inserted in the grooves and is free to travel initially but is clamped with a friction force before the end of the travel. The clamping is achieved with a leaf spring incorporated in one or both grooves.
This spring acts in the plane of the cover perpendicular to the sliding edge and provides enough friction between the spring and the edge of the cover to retain the cover in the grooves of the phone housing. One advantage of this construction is that the size of the battery cover can be reduced and thus its influence on the design of the housing can be minimized. Further advantage is that advanced materials such as flat and scratch resistant sapphire can be easily applied for battery cover.

BRIEF DESCRIPTION OF THE DRAWINGS
The invention will now be described further, by way of example only, with reference to the accompanying drawings, in which:
Fig. 1 is an oblique view of a mobile phone and a battery cover partially sliding into the back of the mobile phone;
Fig. 2 is a cross sectional view of the mobile phone taken along the line XX
in Fig.1;
Fig. 3 is a cross sectional view of the mobile phone taken along the line YY
in Fig.2;
Fig. 4 is an oblique elevated view of the cover plate according to the present invention;
Fig. 5 is and oblique elevated view of the cover plate with a detent.

DETAILED DESCRIPTIOON OF THE INVENTION
According to FIG.1 a mobile telephone comprises a housing I which encases the electronic components of the phone. The phone has a back face 2 which can have various openings such as camera window 3 and speaker 4. On the back side of the phone is also battery compartment 5 which can be closed by the cover 10.
The cover illustrated in FIG 4.has two opposing parallel edges 11 and 12 which have guiding bevelled surfaces 13, 14, 15 and 16. In the preferred embodiment the two guiding surfaces of each edge are arranged to form 90 degrees included angle.
The housing I of the phone has at the battery compartment two opposing V
grooves 6 and 7 which are spaced to accept the cover 10. The spacing of the V
grooves is large enough to allow free travel of the cover along the grooves but constricting the movement of the cover in the direction perpendicular to the cover face surface.
In order to retain the cover in place after the insertion one of the grooves is equipped with a leaf spring 20. The spring is inserted in the pocket 8 of the phone housing as illustrated in Fig. 2 and Fig.3. The spring has two clasps 21 and 22 which retain the spring in the pocked upon insertion. The spring also has a curvature 23 which upon sliding the cover over it forces the spring to flatten. This action creates retaining friction force between the edge 11 of the cover and the spring, as well as between the sliding surfaces 15 and 16 and the V groove 7 of the housing 1. Optionally the retaining of the cover can be enhanced by providing a concave detent 18 to the edge of the cover as shown in Fig. 5.
In order to ease the cover over the spring 20 the leading corner of the cover edge has a chamfer 17 as shown Fig. 4.
~r*sefairneelts:
1. over, for sliding on and off a mobile phone body, comprising a plate, said plate h’ng at least two parallel guiding edges, each said edge defines at least one ch fer surface, said surface slidingly fit corresponding groove of the phone body, w rein the plate is restrained in the direction perpendicular to the plate while said e s are engaged in the grooves of the body.
2. A cover as claimed in Claim , herein said guiding edge defines two symmetrical chamfer surfaces.
3. A cover as claimed in Claim 1, wherein s’ guiding edge defines concave or convex surface.
4. A cover as claimed in Claims I to 3, wherein at least e edge has a concave detent.
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