Bell lock (II)

An improved knob lock commonly used, which comprises a bell inside. The main part of which is a rotator which is turned by rotating either of the knobs and has two extending-out springs to which are attached a steel ball respectively at their ends. Hindrance rods, which are used to prevent the springs from passing freely, make the springs bend until they are forced past the hindrance rods to knock hard on the bell giving out a ringing sound at the same time.

BACKGROUND OF THE INVENTION 
Generally speaking, a door is used to separate indoor from outdoor, and is 
always equipped with a lock by which we have to turn its knob to move a 
latch inwards so as to open the door. But, since turning the knob and 
opening the door won't always make a sound loud enough for persons indoors 
to hear it, somebody may hang a bell inside the door, which may be swung 
to ring while the door is opened so that the persons indoors can be warned 
that somebody is coming in. The object that this invention has aimed to 
attain is to obtain such an alarm at the same time that the knob is turned 
around. 
SUMMARY OF THE INVENTION 
When one of the knobs of this bell lock is turned by hand, not only the 
latch is moved inwards, but also a steel ball at each end of the two 
extending out of a rotator knocks on a bell with a powerful strike, 
surpassing a hindrance rod set on a fixing plate. So manual turning of the 
door knob can open the door, and can ring the bell as well to warn the 
entrance of a person.

DESCRIPTION OF THE PREFERRED EMBODIMENT 
First, as shown in FIG. 1, this invention, a bell lock, comprises inside 
knob 1, bell 2, fixing frame 3, rotator 4, fixing plate 5, linking cover 
6, outside knob 7 and latch 8. Said outside knob 7 and latch 8 are those 
used in common conventional door locks, and they have a lock gut, which is 
able to be turned and unlocked by a key after it is locked and at the same 
time able to move said latch 8 inwards when it is turned. And, in 
addition, said outside knob 7 and said latch have to be fixed up in a 
door. 
In order to get a more clear-cut mutual relationship between each of said 
parts, the detailed description, together with FIGS. 1 and 2, is to be 
related as follows. 
Inside knob 1, comprising a conventional locking structure 11, possesses 
pipe shaft 12 which is able to penetrate bell 2, fixing frame 3, rotator 4 
and fixing plate 5 in order. There are two protruded edges 13 at the end 
of pipe shaft 12, able to fit into slots 61 of linking cover 6. In 
addition, two straight slots 14 cut in pipe shaft 12 of inside knob 1 can 
fit together with tip 41 located at the interior circle of rotator 4 in 
order to make rotator 4 rotate at the same time that inside knob is 
turned. 
Bell 2 is made of metal and has a plurarity of concavities 21 which are 
used to be knocked at by steel balls 43 of rotator 4. Hole 22 bored at the 
center of said bell 2 can be penetrated through by pipe shaft 12 of inside 
knob 1 and has two notches 23 used to fit together with tips 33 of fixing 
frame 3 so as to keep bell 2 at its position. 
Fixing frame 3 uses four feet 31 to fit into hindrance rods 51 of fixing 
plate 5 through hole 32 cut on each of said feet 31 and has two tips 33 to 
fit together with said notches 23 of bell 2. 
Rotator 4 is confined between fixing frame 3 and fixing plate 5, combined 
together with pipe shaft 12 of inside knob 1 and uses tips 41 to fit in 
slots so that it is able to be turned around by the manual turning of 
inside knob 1 as well. In addition, rotator 4 has two extensible and 
flexible springs 42 which are respectively attached with a steel ball at 
their ends. 
The distance between the center of rotator 4 and said steel ball is longer 
than that between the center of fixing plate 5 and hindrance rod 51, 
enabling said hindrance rods 51 to hinder the moving of steel ball 43. 
Fixing plate 5 has two holes 52 used for bolting said fixing plate 5 on a 
door, and four hindrance rods 51 used for hampering the passing of steel 
bells 43 of rotator 4. 
Linking cover 6 is used to link inside knob 1 with outside knob 7 together. 
On its top there are slots 61 for protruded edges 13 of inside knob 1 to 
stick in and slot 62 for key plate 71 of outside knob 7 to stick in. So, 
when outside knob 7 is turned around, said key plate 71 can force latch 8 
to move inwards and cause linking cover 6 to rotate at the same time, and 
inside knob 1, via pipe shaft 12, can force rotator 4 to turn around. In 
addition, spring 63 inserted inside linking cover 6 is able to push inside 
knob 1 or outside knob 7 back to its original position after it has been 
turned around. 
Furthermore, an embodiment of how rotator 4 and bell 2 function to make 
sounds is shown in FIG. 3. When inside knob 1 or outside knob 7 is turned, 
latch 8 will move inwards, and springs 42 and steel balls 43 will make 
turning movement, as the arrow shows, starting from their static position 
42' and 43'. Since hindrance rods 51 form hindrance against the moving of 
springs 42 and steel balls 43, the latter may be hindered for a very short 
while, but once they are forced to pass it over, they can knock strongly 
onto concavities 21 to make a sound of ringing. 
Next, when the manual force for turning inside knob 1 or outside knob 7 
disappears, said inside or outside knob will be automatically, because of 
the elasticity of spring 63, returned back to its original position as 
shown in FIG. 4. It shows that springs 42 and steel balls 43, as the arrow 
indicates, will be stopped again by said rods 51 and then knock onto 
concavities 21 to ring once again when forced to overpass said rods 51. 
What is more, as shown in FIG. 5, inside knob 1 or outside knob 7 can be 
changed into other shapes when can also force rotator 4 to turn and cause 
steel balls 43 of rotator 4 to knock onto bell 2 as above-mentioned, 
obtaining the object of this invention.