Tool driving or impacting – Impacting devices – Hammer head driven by spring
Reexamination Certificate
2001-05-14
2002-06-25
Smith, Scott A. (Department: 3724)
Tool driving or impacting
Impacting devices
Hammer head driven by spring
C173S124000, C173S205000, C030S167000, C030S367000
Reexamination Certificate
active
06408951
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
This invention relates to an impact tool for cutting a cable, more particularly to an automatic cable-cutting apparatus, which can be activated by operating a switch.
2. Description of the Related Art
Referring to
FIG. 1
, a cable holder
1
is shown to include several cable holding rows
11
, each of which is provided with two elongated planar surfaces
12
that are located on two sides thereof. Each of the rows
11
includes a plurality of cable clamping units
14
, each of which can hold a cable
13
thereon. Accordingly, thousands of cables
13
(only one is shown) can be fastened to the holder
1
. When the cables
13
have been mounted on the holder
1
, surplus lengths of the former are cut off by means of a blade
28
so as to prevent hindrance to subsequent mounting and checking of the cables
13
.
Referring to
FIG. 2
, the blade
28
is disposed on a cable-cutting apparatus
2
, which includes a housing
21
, a cutter rod
22
, a driving unit
23
, a guiding ring
24
, an impact rod
25
, a large spring
26
, and a force-adjusting unit
27
. The cutter
22
is disposed slidably in the housing
21
. The blade
28
is fixed to an end of the cutter rod
22
. The driving unit
23
is disposed between the cutter rod
22
and the impact rod
25
, and includes a driving member
231
and a coiled small spring
232
, which has an inclined lowermost turn
2324
that presses against an outwardly extending lower end flange
233
of the driving member
231
. As such, the axis of the driving member
231
is inclined. The driving member
231
has a large-diameter lower portion
234
, on which the small spring
232
is sleeved fixedly, a truncated conical middle portion
235
, and a small-diameter upper portion
236
. The impact rod
25
is biased by the large spring
26
to press the guiding ring
24
against an inwardly extending flange
210
of the housing
21
. The force-adjusting unit
27
includes a follower piece
271
and a rotary knob
272
, which is formed integrally with an outwardly extending flange
273
that is received rotatably within an annular groove
211
in the housing
21
. When the rotary knob
272
is rotated, a cam surface
274
of the rotary knob
272
pushes the follower piece
271
to further compress the large spring
26
, thereby increasing the biasing force of the large spring
26
.
Referring to
FIG. 3
, when a force is applied to the blade
28
so as to press a cable
13
against one of the planar surfaces
12
, a top surface of the cutter rod
22
pushes the driving member
231
to move upward through a central hole
241
in the guiding ring
24
. When the driving member
231
moves upward to contact the impact rod
25
, it turns to a somewhat inclined position, where the small-diameter upper portion
236
is still somewhat deflected from a blind hole
251
in the central portion of a bottom end surface of the impact rod
25
, as illustrated. Upon further application of a depressing force to the apparatus
2
, the small-diameter upper portion
236
turns to register with the hole
251
in the impact rod
25
, thereby permitting a rapid downward movement of the impact rod
25
relative to the driving member
231
. Hence, the impact rod
25
can impact on the driving member
231
so as to cut the cable
13
with the blade
28
. Although the aforementioned apparatus
2
can cut effectively the cable
13
, the force needed to be exerted by a person to press the apparatus
2
against the cable
13
is too large to cut numerous cables
13
efficiently.
SUMMARY OF THE INVENTION
An object of this invention is to provide an automatic cable-cutting apparatus, which can be activated by operating a switch.
According to this invention, a cable-cutting apparatus includes a housing, a cutter rod with a fixed blade, an impact rod, a resilient unit for biasing the impact rod to press against the cutter rod, a rotating unit, and a driving unit. Normally, an engagement surface of the impact rod abuts against an engagement surface of the cutter rod. When the blade presses a cable against a planar surface, and when a switch of the driving unit is actuated to rotate the rotating unit, the engagement surface of the impact rod moves rearward away from the engagement surface of the cutter rod against the biasing action of the spring until the push rod reaches a rear limit position, after which the impact rod is biased by the spring to move forward to impact on the cutter rod, thereby cutting the cable with the blade.
REFERENCES:
patent: 4682412 (1987-07-01), Pfeffer
patent: 5287582 (1994-02-01), Kawai et al.
patent: 5427188 (1995-06-01), Fisher
patent: 5794325 (1998-08-01), Fallandy
patent: 6085850 (2000-07-01), Phillips
patent: 6212758 (2001-04-01), Baker et al.
Smith Scott A.
Webb Ziesenheim & Logsdon Orkin & Hanson, P.C.
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