Electricity: electrothermally or thermally actuated switches – Electrothermally actuated switches – Fusible element actuated
Reexamination Certificate
2000-02-01
2001-12-04
Picard, Leo P. (Department: 2835)
Electricity: electrothermally or thermally actuated switches
Electrothermally actuated switches
Fusible element actuated
C337S214000, C361S626000, C361S642000, C439S250000, C439S830000
Reexamination Certificate
active
06326878
ABSTRACT:
BACKGROUND OF THE INVENTION
The present invention relates to fuse holders, and more particularly to such a fuse holder, which automatically compensates diameter difference of conducting blades of installed fuse, keeping installed fuse in positive connection to electric wires.
A regular fuse holder, as shown in
FIG. 7
, is generally comprised of a base panel
5
, a cover
51
covered on the base panel
5
, a plurality of conducting blocks
6
respectively mounted on the base panel
5
at two opposite sides, a plurality of electric wires
63
respectively fastened to the conducting blocks
6
, and a plurality of cartridge fuse
3
respectively connected in parallel between the conducting blocks
6
. The conducting blocks
6
each comprise a front extension
61
, and a clamping plate
62
fixedly fastened to the front extension
61
by a screw
611
for receiving one conducting blade
31
of one cartridge fuse
3
. The clamping plate
62
comprises a flat mounting base
621
, and two curved clamping portions
622
extended from the flat mounting base
621
at two opposite sides for holding the conducting blade
31
at one end of one cartridge fuse
3
.
FIGS. 10 and 11
show another structure of fuse holder according to the prior art. This structure of fuse holder comprises a base panel
5
, a plurality of conducting blocks
7
respectively mounted on the base panel
5
, a plurality of electric wires
71
respectively connected to the conducting blocks
7
, a plurality of clamping plates
8
respectively fastened to the conducting blocks
7
by respective screws
82
, a cover
51
covered on the base panel
5
, and a plurality of plug fuse
43
inserted through respective opening on the cover
51
and connected between the conducting blocks
431
. The clamping plates
8
each comprise two curved clamping portions
81
for receiving one conducting blade
431
of one plug fuses
43
. The aforesaid prior art fuse holders are still not satisfactory in function. The drawbacks of these prior art fuse holders are as follows:
(1) The curved clamping portions
622
,
81
of the clamping plates
62
,
8
may have different curvature due to different processing tolerance or material stress, causing installed cartridge fuse
3
or plug fuse
43
unable to be positively secured in position (see FIGS.
8
and
13
).
(2) If the conducting blades
31
or
431
of the fuse
3
or
43
are deformed, the clamping portions
622
or
81
cannot fully compensate the deformation of the conducting blades
31
or
431
, and the fuse
3
or
43
may be vibrated after installation.
SUMMARY OF THE INVENTION
The present invention has been accomplished to provide a fuse holder, which eliminates the aforesaid drawbacks. According to one embodiment of the present invention, the fuse holder comprises a base panel, a plurality of conducting blocks mounted on the base panel, a plurality of electric wires respectively connected to the conducting blocks, and a plurality of cartridge fuses respectively connected in parallel between the conducting blocks, wherein each conducting block has at least one smoothly arched clamping strip, each clamping strip having two clamping flanges extending from two opposite sides and curved radially toward each other and defining a smoothly arched clamping mouth for holding one conducting blade of one cartridge fuse, and two notches respectively disposed between the clamping flanges and the respective conducting block, the clamping flanges each having a plurality of radially extended splits, which separate the corresponding clamping flange into a plurality of fingers. According another embodiment of the present invention, the fuse holder is designed for the installation of a plug fuse, in which each conducting block comprises two parallel clamping flanges defining a flat, upwardly extended receiving space for receiving one conducting blade of a plug fuse, the clamping flanges each having a plurality of upwardly extended vertical splits, which divide the respective clamping flange into a plurality of upwardly extended fingers.
REFERENCES:
patent: D. 421248 (2000-02-01), Baccei
patent: 3678451 (1972-07-01), Bollver
patent: 3896353 (1975-07-01), Burton et al.
patent: 3927929 (1975-12-01), Puetz
patent: 3960435 (1976-06-01), Bailey et al.
patent: 4547036 (1985-10-01), Keglewitsch et al.
patent: 4801278 (1989-01-01), Sappington
patent: 4921450 (1990-05-01), Herbert
patent: 5167541 (1992-12-01), Alves et al.
patent: 5328392 (1994-07-01), Lin et al.
patent: 5618209 (1997-04-01), Lin et al.
patent: WO-96/29721-A1 (1996-09-01), None
Picard Leo P.
Rosenberg , Klein & Lee
Vortman Anatoly
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