Note: Descriptions are shown in the official language in which they were submitted.
SCREW CAPABLE OF EASILY DRILLING HOLES AND DREGS
REMOVING
FIELD OF THE INVENTION
The present invention relates to screws, and in particular to a screw
capable of easily drilling of holes and with the function of dregs removing.
BACKGROUND OF THE INVENTION
Screws have different features based on the objects to be drilled. These
features are aimed at to have preferred drilling speed, high dregs removing
rate,
and easiness in drilling operation. However, the dregs generated in drilling
will be
left in the drilling hole, but this residue left in the hole is possible to
cause that the
object to be drilled cracks. The main reason of such a defect is that the
dregs left
in the hole will further expand the hole to have a larger size, as a result
the object
to be drilled cracks. A further reason is that the outer diameter of the screw
head is
larger than an inner diameter of the hole. Then the screw head is embedded
into
the hole, it is possible that the hole will crack. It is desired to cut,
expand and
smooth the hole before embedding the screw head so that the larger screw head
can be flatly embedded into the hole with an easy and comfortable operation.
Furthermore, no cracking forms and the edge of the hole is smooth.
SUMMARY OF THE INVENTION
The object of the present invention is to provide a screw capable of
drilling holes easily and removing dregs effectively, which has the advantages
of
providing a screw by which the screw head can be easily embedded into the
drilling hole with a crack-proof effect; proving a screw by which the drilling
hole
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can be cut and expanded before embedding the screw head for dregs removing so
that the screw head can be embedding to the drilling hole smoothly; providing
a
screw by which the edge of the drilling hole will not expose out.
To achieve above object, the present invention provides a screw capable of
easily drilling holes and dregs removing, comprising: a head and a stem
extending
from a lower portion of the head; the head and the stem being formed
integrally;
the head being formed by an upper portion and a lower portion; the upper
portion
being a round disk with flat upper surface; and the lower portion being an
expanding from a lower side of the round disk and being connected to the stem;
a
lower surface of the round disk is formed as an annular ring; wherein the
annular
ring of the round disk of the head is formed with a plurality of inclined
protrusion;
the recesses between the protrusions extend from an inner edge of the round
ring
to an outer edge of the round ring and are arranged along un-radial paths; a
periphery of the lower portion of the head is formed with at least one knife
sheet
which extends from the annular ring of the round disk of the head to the stem
with
a predetermined distance; and the direction of the knife sheet is inclined to
an axis
of the lower portion of the head, and the knife sheets connect to the head
only at
the lower portion thereof, and not at the lower surface of the round disk.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 shows the embodiment of the present invention.
FIG. 2 shows another embodiment of the present invention.
FIG. 3 shows a further embodiment of the present invention.
FIG. 4 is a cross sectional view along line B-B of FIG. 3.
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FIG. 5 shows yet an embodiment of the present invention.
FIG. 6 is a cross sectional view viewed from a line C-C of FIG. 5 of the
present invention.
FIG. 7 shows a further embodiment of the present invention.
FIG. 8 is a schematic view viewed from a line D-D of FIG. 7 of the
present invention.
FIG. 9 shows an embodiment showing a flat annular ring according to the
present invention.
FIG. 10 shows an embodiment showing a teethed annular ring according
to the present invention.
FIG. 11 shows another embodiment of the present invention.
FIG. 12 shows another embodiment of the present invention.
FIG. 13 shows another embodiment of the present invention.
FIG. 14 shows another embodiment of the present invention.
FIG. 15 shows another embodiment of the present invention.
FIG. 16 shows another embodiment of the present invention.
FIG. 17 shows another embodiment of the present invention.
FIG. 18 shows another embodiment of the present invention.
FIG. 19 shows another embodiment of the present invention.
FIG. 20 shows another embodiment of the present invention.
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DETAILED DESCRIPTION OF THE DRAWINGS
In order that those skilled in the art can further understand the present
invention, a description will be described in the following in details.
However,
these descriptions and the appended drawings are only used to cause those
skilled
in the art to understand the objects, features, and characteristics of the
present
invention, but not to be used to confine the scope and spirit of the present
invention defined in the appended claims.
With reference to FIGS. 1 and 2, the structure of the present invention is
.. illustrated.
Referring to FIGS. 1 and 2, the embodiment of the present invention is
illustrated, wherein the design of the present invention can be widely used
for
crack-proof screws and wood screws, and others for drilling holes and dregs
removing. With reference to FIGS. 3 to 20, it is illustrated that the present
invention can be widely used in trumpet form screws, tapered screws or post
form
screws. The details of these screws will be described screws or post form
screws.
The details of these screws will be described hereinafter.
With reference to FIGS. 1 and 2, the screw of the present invention
includes a head 1 and a stem 2 which is formed integrally.
A lower portion of the head 1 has a round tapered shape and is connected
to the stem 2 at the lowermost end thereof. An upper portion of the round
tapered
head 1 is formed as a flat round disk 11. A lower side of the round disk 11 is
connected to an upper end of the lower tapered portion of the head 1. A lower
side
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of the round disk unconnected to the tapered portion is formed as an annular
ring
as illustrated in FIGS. 4 and 6.
The annular ring of the round disk 11 of the head 1 is formed with a
plurality of inclined protrusion 12. The recesses between the protrusions 12
are
arranged along un-radial paths. These recesses may be straight lines
(referring
to FIG. 6) or cambered (referring to FIG. 4).
A periphery of the lower tapered portion of the head 1 is formed with at
least one knife sheets 3 which extended from the annular ring of the round
disk 11
of the head 1 to the stem 2. Furthermore, the knife sheets 3are extended to a
distance L of the stem 2. The direction of the knife sheet 3 is inclined to
the axis
of the lower tapered portion of the head 1. The knife edge of the knife sheet
3 may
be straight (referring to FIGS. 1 to 3, 5, 7, 12 and 16) or inwardly cambered
(referring to FIGS. 15 and 18) or outwardly cambered (referring to FIGS. 14,
17
and 19). Two sides of the knife edge of the knife sheet 3 may be formed with
cut
planes (referring to FIG. 20). The direction of the knife edges of the knife
sheet 3
can be non-radial (referring to FIGS. 1 to 12), or radial (referring to FIGS.
13 to
20).
With reference to FIGS. 3 and 4, an lower surface of each protrusion of the
annular ring of the head 1 is parallel to the upper surface of the round disk
11. The
recesses between the protrusions 12 of the annular ring of the head 1 are not
radially arranged and are cambered; and the knife edges of the knife sheets 3
are
not radially arranged and are cambered. That is, the knife edge has an
inclined
angle A with respect to the axis of the lower tapered portion of the head 1.
Referring to FIGS. 5 and 6, the protrusions 12 of the annular ring of the head
1 is
parallel to the upper surface of the round disk 11. The recesses between the
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protrusions 12 of the annular ring of the upper portion of the head 1 are not
radially arranged and are straight; and the knife edges of the knife sheets 3
are not
radially arranged and are straight. That is, the knife edge has an inclined
angle A
with respect to the axis of the lower tapered portion of the head 1.
Referring to FIGS. 7 and 8, a lower surface of each protrusions of the
annular ring of the head 1 is not parallel to the upper surface of the round
disk 11.
The recesses between the protrusions 12 of the annular ring of the head 1 are
not
radially arranged and are straight; and the knife edges of the knife sheets 3
are not
radially arranged and are straight. That is, the knife edge has an inclined
angle A
with respect to the axis of the lower tapered portion of the head 1.
In FIG. 9, the lower annular ring 11 is flat and in FIG. 10, the annular ring
has a teethed surface.
As illustrated in FIG. 11, the recesses between the protrusions 12 of the
annular ring of the upper portion of the head 1 are not radially arranged and
are
cambered; and the knife edges of the knife sheets 3 are not radially arranged
and
are straight. That is, the knife edge has an inclined angle A with respect to
the axis
of the lower tapered portion of the head 1.
As illustrated in FIG. 12, the recesses between the protrusions 12 of the
annular ring of the upper portion of the head 1 are not radially arranged and
are
straight; and the knife edges of the knife sheets 3 are not radially arranged
and are
cambered. That is, the knife edge has an inclined angle A with respect to the
axis
of the lower tapered portion of the head I.
Referring to FIGS. 13 and 16, it is illustrated that the knife edge of the
knife sheet 3 is straight.
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With reference to FIGS. 13, 17 and 19, it is illustrated that the knife edge
of the knife sheet 13 is outwardly cambered.
With reference to FIGS. 15 and 18, it is illustrated that the knife edge of
the knife sheet 13 is inwardly cambered.
With reference to FIG. 20, it is illustrated that the lower portion of the
head 1 is a round cylinder and the knife sheet 3 is only at the stem 2.
By above mentioned structure of the present invention, when the screw
drills into an object, the outer diameter of the head 1 is greater than that
of the
stem 2, and the dregs generated in drilling will hinder the drilling operation
of the
screw. The knife sheets 3 of the present invention has the effect of cutting
and
expanding the drilling hole further so that dregs can be discharged
effectively and
thus the screw can drill into the object easily. The protrusions 12 at the
annular
ring of the head 1 have the effect of preventing the expose of the dregs and
presenting a flat outer look.
The present invention is thus described, However, it will be obvious that
the same may be varied in many ways. Such variations are not to be regarded as
a
departure from the spirit and scope of the present invention, and all such
modifications as would be obvious to one skilled in the art are intended to be
included within the scope of the following claims.
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