Battery holder

A battery holder adapted for attaching to a mobile telephone to provide it with battery power supply, the battery holder including a holder base holding a set of battery cells, a swivel hook member turned about an axis in an opening at one end of the holder base, the swivel hook member having a hooked portion adapted for hooking on a retaining hole on the mobile telephone to secure the battery holder and the mobile telephone together, a top cover covered on the holder base, and a spring element mounted between the top cover and the swivel hook member and adapted to force the hooked portion of the swivel hook member into engagement with the retaining hole on the mobile telephone.

BACKGROUND OF THE INVENTION 
The present invention relates to a battery holder for a mobile telephone, 
and more particularly to such a battery holder which can be quickly 
installed in the mobile telephone, and then conveniently removed from it 
when needed 
A regular battery holder for a mobile telephone generally comprises a 
hollow locating rod raised from the shell thereof, a cylindrical spring 
member mounted in the hollow locating rod, and lock means supported on the 
cylindrical spring member and adapted for securing the battery holder to 
the mobile telephone. This structure of battery holder has drawbacks. One 
drawback of this structure of battery holder is that the narrow portion of 
the shell around the hollow locating rod tends to be damaged due to 
frequent operation of the lock means. In order to eliminate this problem, 
the structure of narrow portion of the shell must be reinforced with a 
reinforcing metal plate. Another drawback of this structure of battery 
holder is the complicated procedure of mounting the cylindrical spring and 
the lock means in the hollow locating rod. Furthermore, it is not easy to 
positively lock the lock means. 
SUMMARY OF THE INVENTION 
The present invention provides a battery holder for a mobile telephone 
which eliminates the aforesaid drawbacks. The battery holder comprises a 
holder base having an opening at one end, two axle housings at two 
opposite sides of the opening, and two receiving portions below the axle 
housings; a swivel hook member mounted in the opening on the holder base 
and adapted to secure the holder base to the mobile telephone, the swivel 
hook member comprising a transverse pivot pin mounted in the axle housings 
for permitting the swivel hook member to be turned in the opening on the 
holder base, a press portion at the top through which the swivel hook 
member can be turned in the opening on the holder base with the hand, two 
stop blocks respectively received in the receiving portions of the holder 
base to limit the turning angle of the swivel hook member, and a hooked 
portion raised from the back and adapted for hooking on a retaining hole 
on the mobile telephone; a top cover covered on the holder base, the top 
cover having a stop edge adapted to stop said transverse pivot pin of the 
swivel hook member in the axle housings; and a spring element mounted 
between the swivel hook member and the top cover and adapted to force the 
hooked portion of the swivel hook member into engagement with the 
retaining hole on the mobile telephone.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT 
Referring to FIGS. 1 and 2A, a battery holder 5 is shown comprised of a top 
cover 1, a swivel hook member 2, a holder base 3 holding a set of dry 
battery cells 30, and a spring element 24. 
The holder base 3 comprises an opening 34 at one end, two axle housings 
32;32' at two opposite sides of the opening 34, and two receiving portions 
33;33' at two opposite sides of the opening 34 below the axle housings 
32;32'. The swivel hook member 2 is mounted in the opening 34 on the 
holder base 3, comprising a transverse pivot pin 21 mounted in the axle 
housings 32;32' for permitting the swivel hook member 2 to be turned 
therein, a press portion 20 at the top through which the swivel hook 
member 2 can be turned with the hand, two stop blocks 23;23' disposed in 
parallel to the pivot pins 21 at a bottom side which are respectively 
received in the receiving portions 33;33' of the holder base 3 to stop the 
swivel hook member 2 from turning forwards, a retaining groove 22 at a 
front side thereof between the stop blocks 23;23', and a hooked portion 25 
raised from a back side thereof. The top cover 1 is covered on the holder 
base 3, having an opening 12 at one end corresponding to the opening 34 on 
the holder base 3, a stop edge 10 disposed at the bottom side of the 
opening 34 and adapted to stop the transverse pivot pin 21 of the swivel 
hook member 2 in the axle housings 32;32', and a retaining notch 11. The 
spring element 24 is stopped between the swivel hook member 2 and the top 
cover 1, having two opposite end pieces 26;26' respectively fastened to 
the retaining groove 22 on the swivel hook member 2 and the retaining 
notch 11 on the top cover 1. The spring element 24 imparts a pressure to 
the swivel hook member 2, causing the hooked portion 25 of the swivel hook 
member 2 to be forced out of the back side of the holder base 3. 
Referring to FIGS. 2A, 2B and 3, when the battery holder 5 is attached to 
the mobile telephone 6, the power output contacts 31;31' on the battery 
holder 5 are respectively disposed in contact with the power input 
contacts 61;61' on the mobile telephone 6, and the hooked portion 25 of 
the swivel hook member 2 is forced by the spring element 24 into 
engagement with a retaining hole 60 on the mobile telephone 6, and 
therefore the battery holder 5 and the mobile telephone 6 are firmly 
retained together. When pressing the press portion 20 of the swivel hook 
member 2 with the hand to turn the swivel hook member 2 from the position 
4 shown in FIG. 2A to the position 4' shown in FIG. 2B, the hooked portion 
25 of the swivel hook member 2 is disengaged from the retaining hole 60 on 
the mobile telephone 6, and the battery holder 5 can thus be removed from 
the mobile telephone 6. After the battery holder 5 has been disconnected 
from the mobile telephone 6, the swivel hook member 2 is immediately 
forced by the spring element 24 back from the position 4' shown in FIG. 2B 
to the position 4 shown in FIG. 2A.