U.S. patent application number 09/738313 was filed with the patent office on 2002-06-20 for putty knife handle.
Invention is credited to Chen, Kun-You.
Application Number | 20020073554 09/738313 |
Document ID | / |
Family ID | 26056609 |
Filed Date | 2002-06-20 |
United States Patent
Application |
20020073554 |
Kind Code |
A1 |
Chen, Kun-You |
June 20, 2002 |
Putty knife handle
Abstract
A putty knife handle is made up of an upper lid and a
corresponding lower base. Both of them form a housing with location
holes for insertion pieces and columnar tubes for insertion posts
coupled and fixed with each other. The invention is characterized
in that the upper lid and lower base respectively form at the front
relatively a stepped projecting piece and a projecting seat. At the
front of the projecting seats is a slot. Relative to the body of
the lower base and behind the slot are U-shaped frames, which
enable the clamping end of the blade to be implanted into the two
U-shaped frames after being inserted through the slots to make it
fixed firmly. Also the handle has a rubber coating for easy
holding.
Inventors: |
Chen, Kun-You; (Taipei,
TW) |
Correspondence
Address: |
BIRCH STEWART KOLASCH & BIRCH
PO BOX 747
FALLS CHURCH
VA
22040-0747
US
|
Family ID: |
26056609 |
Appl. No.: |
09/738313 |
Filed: |
December 18, 2000 |
Current U.S.
Class: |
30/169 ;
15/143.1; 15/236.01 |
Current CPC
Class: |
B25G 3/18 20130101; B25G
1/102 20130101; B25G 3/14 20130101; B44D 3/164 20130101 |
Class at
Publication: |
30/169 ;
15/143.1; 15/236.01 |
International
Class: |
A47L 013/022 |
Claims
What is claimed is:
1. A putty knife handle comprising a blade having a clamping end
which is fitted with a elongated hole, and a handle having an upper
lip and a lower base, both of which correspond to each other
longitudinally and are similarly formed in the shape of a shell,
insertion posts and columnar tubes being respectively arranged at
corresponding positions of said upper lip and said lower base upper
lid for an inserting fixation with each other, characterized in
that a slot with a certain width is mounted at front end of a
projecting seat of said lower base along and through the
longitudinal axle, and said slot can be formed as a flared opening,
and that two U-shaped frames are arranged against each other on the
other end of said slot of said lower base, and a barbed tenon is
interposed between said two U-shaped frames, and that two lateral
sides of said blade are respectively inserted into the grooves of
said two corresponding U-shaped frames for fixation after said
clamping end of said blade is inserted into and forced out of said
slot, while said elongated hole on said clamping end of said blade
is exactly jointed with the barbed tenon for fixation, and that the
surface of said handle is coated with a layer of rubber for easy
holding.
2. The putty knife handle as claimed in claim 1, wherein a
depression bar, which gives said clamping end of said blade an
additional clamping pressure in engaging with each other, is
arranged behind a projecting piece on said upper lid, corresponding
to the center of said two U-shaped frames of said lower base.
3. The putty knife handle as claimed in claim 1, wherein projecting
members with certain thickness are respectively mounted on the
outer surface of said upper lid and said lower base and are used as
reference point in attaching said rubber thereto.
4. The putty knife handle as claimed in claim 1, wherein a
horizontal projecting part and a horizontal recessing part are
respectively arranged below said projecting piece on said upper lid
and said projecting seat on said lower base so as to avoid the
sliding.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The present invention relates to a putty knife handle,
especially a tight structure of the putty knife handle, whose blade
and handle, with high strength and ease of holding, can be rapidly
connected. Also inside the handle's housing is supporting structure
that not only saves more materials and radiates heat more rapidly,
but also has excellent strength as well. All these contribute to
the quality of the present invention as an excellent knife
product.
[0003] 2. Description of the Prior Art
[0004] The putty knife is used for removal of residual paint on the
wall in construction projects. Since bricklayers use it quite often
with relatively great force, the structure between the blade and
the handle should be specially designed. The structure of a common
putty knife is shown on FIG. 9, namely the handle of the blade (60)
is clamped by the upper and lower clamping pieces facing each other
and fixed with a rivet (52) through the upper clamping piece (50),
the blade (60) and the lower clamping piece (51). However, such
kind of structure has the following disadvantages:
[0005] 1. Since the rivet of the above-mentioned structure goes
loose easily after being used for a long time because the clamping
force is mainly at the rivet and it is not a surface contact, the
lateral thrust will result in looseness. This is the main
disadvantage.
[0006] 2. Since this kind of upper and lower clamping pieces are
mostly made of wood with higher strength, the long term exertions
on the knife will result in holding discomfort and numbness of the
hand. This is another disadvantage.
[0007] There is another commonly used structure shown in FIG. 8.
The hard plastic handle (70) is jointed with the base of the blade
(61) directly during the injection to get a structure with a firmly
fixed handle. However, it also has disadvantages in
implementation:
[0008] 1. The handle has to have a certain thickness for easy
holding, but this thickness results in longer time for cooling
after it has jointed with the blade, which in turn leads to longer
manufacturing time and thus raise the cost.
[0009] 2. Also the knife handle is made completely of hard plastics
with great hardness. The problem of holding discomfort remains
unsolved.
[0010] 3. Furthermore, the knife handle is completely made of hard
plastics with greater consumption of materials. There is greater
waste, which shows more conspicuously in mass production. This is
another disadvantage.
[0011] 4. The knife has a polished surface. When being placed into
the mold to be joined with the hard plastics, the knife tends to
have inevitable scratches by the contact with the mold.
[0012] 5. To increase production and cool the molds more rapidly,
water is used for cooling. Thus the knife is immersed in water
completely until medium and high temperatures and then being put
into cold water so that it is very easy to get oxidized and rusty.
This is another disadvantage.
SUMMARY OF THE INVENTION
[0013] Therefore, it is a primary object of the present invention
to provide a putty knife handle, which is made up of a
corresponding upper lid and a lower base. Both of them form a
housing with location holes for insertion pieces and columnar tubes
for insertion posts coupled and fixed with each other. The upper
lid and lower base are tightly fixed, which enables the knife
handle and the blade to be firmly secured to avoid loosening. The
projecting piece and projecting piece seat are disposed at the
front end of upper lid and lower base respectively. A slot is
mounted inside and penetrating through the lower base, parallel to
the central axis thereof. Relative to the body of the lower base,
U-shaped frames are arranged behind the slot for enabling the
clamping end of the blade to be implanted into the two U-shaped
frames after being inserted through the slots to make it fixed
firmly.
[0014] It is a further object of the present invention to provide a
putty knife handle that is covered with a layer of rubber coating
in order to fill the groove between embossed parts for holding
easily and comfortably.
BRIEF DESCRIPTION OF THE DRAWINGS
[0015] The accomplishment of the above-mentioned object of the
present invention will become apparent from the following
description and its accompanying drawings which disclose
illustrative an embodiment of the present invention, and are as
follows:
[0016] FIG. 1 shows a perspective view of the present
invention;
[0017] FIG. 2 shows the combination of the blade with the lower
base of the present invention;
[0018] FIG. 3 is a side view of the present invention;
[0019] FIG. 4 is an exploded view of the upper lid and lower base
of the present invention;
[0020] FIG. 5 is a cross-sectional view at the U-shaped frame of
the lower base of the present invention;
[0021] FIG. 6 is a cross-sectional view of the handle of the
present invention;
[0022] FIG. 7 shows a cross-sectional view of the combination of
the horizontal projecting part and the horizontal recessing part of
the present invention;
[0023] FIG. 8 is a perspective view of a prior art;
[0024] FIG. 9 is a perspective view of another prior art;
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0025] Refer to the FIG. 1 and FIG. 2. The front end of the blade
(10) of the putty knife may take different forms as shown in FIG. 1
and FIG. 4 while the handle is tapered to form the clamping end
(11). There is at least one elongated hole (13) disposed in the
center of the clamping end (11) and the two lateral sides of the
clamping end are indented edges (12).
[0026] With reference to FIG. 3 and FIG. 4, a handle of the
invention mainly includes the upper lid (20) and the lower base
(30), both of which corresponds to each other longitudinally and
have flange strip (25)(38) around the inner side respectively. A
housing of handle is formed by the combination of the upper lid
(20) and the lower base (30). Insertion posts (24) and columnar
tubes (36) are arranged at the proper positions for each other's
insertion and fixation.
[0027] The projecting piece (21) mounted on the upper lid (20) and
the projecting seat (31) mounted on the lower base (30) are
corresponding to each other. Location holes (22) and insertion
pieces (32) are arranged at the projecting piece (21) and
projecting seat (31) respectively, corresponding to each other.
Thus these corresponding components can be inserted and fixed with
each other firmly when they are assembled together.
[0028] Please refer to FIG. 2, FIG. 3 and FIG. 4, the thickness of
the projecting seat (31) of the lower base (30) is fairly large and
a slot with a certain width is mounted at the front end thereof
along and through the longitudinal axle. This slot (33) can also be
a flared opening. On the other end of the slot (33) of the lower
base (30), two U-shaped frames (34) are arranged against each
other. Between the two U-shaped frames (34), there is a barbed
tenon (35). After the clamping end (11) of the blade (10) being
inserted into and forced out of the slot (33), the two lateral
sides of the blade (10) are inserted into the grooves of the two
corresponding U-shaped frames respectively (34) for fixation, while
the elongated hole (13) on the clamping end (11) of the blade (10)
is exactly jointed with the barbed tenon (35) and the indented edge
(12) is also clipped with the inner wall of the slot (33).
[0029] Please refer to FIG. 3 and FIG. 4, a depression bar (26)
which can give the clamping end (11) of the blade (10) an
additional clamping pressure when engaging occurs is arranged
behind the projecting piece (21) on the upper lid (20),
corresponding to the center of the two U-shaped frames (34) of the
lower base (30).
[0030] Please also refer to FIG. 1 and FIG. 6, projecting members
(23)(37) are disposed on the outer surface of the upper lid (20)
and the lower base (30) respectively. Ending at the top of the
projecting members (23)(37) of the handle's surface, the surface of
the handle is coated with a layer of rubber (40) for easy holding.
And the flange strips (25)(38) around the outer edge of the upper
lid (20) and the lower base (30) is directly pressed or through
melting with each other for thorough sealing. Applying the rubber
coating (40) around the outside of the handle as described above
can prevent the rubber coating (40) from getting into the housing
to obtain a complete knife structure. Please refer to FIG. 2 and
FIG. 4 again, a horizontal projecting part (27) and horizontal
recessing part (39) are arranged below the projecting piece (21) on
the upper lid (20) and the projecting seat (31) on the lower base
(30) respectively. When the upper lid (20) and the lower base (30)
are pressed against each other firmly as shown in FIG. 7, the
combination of the horizontal projecting part (27) and horizontal
recessing part (39) can prevent sliding.
[0031] The present invention has following advantages:
[0032] 1. By the blade being inserted into the two corresponding
U-shaped frames, indented edge thereof clipping with the slot, the
clamping end thereof jointed with the barbed tenon, and the
pressing of the depression bar, the blade and the handle are fixed
with each other firmly.
[0033] 2. To assemble the above-mentioned structure, it is only
necessary to press the blade into the hole. The clipping of the
blade with the slot and the U-shaped frame and locating of the
barbed tenon are all completed in an instant, which facilitates the
assembly.
[0034] 3. Since the upper lid and the lower base form the housing,
its heat forming and cooling are relatively faster. Also in the
inside thereof are strong supporting parts. Therefore, it also has
good strength as well.
[0035] 4. The projecting members outside the surface of the product
are coated with a layer of rubber coating for comfortable holding.
And the flange strips can be melt and pressed with each other for
complete sealing so that the rubber coating cannot flow into the
inside of the housing thus obtaining a integrated knife
structure.
[0036] 5. Inside the projecting seat on the lower base, there is a
slot for insertion of the blade. After the clamping end of the
blade being inserted into the slot, it is wrapped by the
surrounding walls, which makes the blade and the lower base combine
with each other more tightly to avoid loosening.
[0037] 6. On the upper lid and lower base, there are horizontal
projecting part and horizontal recessing part arranged
correspondingly so as to avoid the sliding.
* * * * *