U.S. patent application number 12/538178 was filed with the patent office on 2011-02-10 for side-push type composite putty knife.
Invention is credited to Desheng WANG.
Application Number | 20110030224 12/538178 |
Document ID | / |
Family ID | 43533655 |
Filed Date | 2011-02-10 |
United States Patent
Application |
20110030224 |
Kind Code |
A1 |
WANG; Desheng |
February 10, 2011 |
SIDE-PUSH TYPE COMPOSITE PUTTY KNIFE
Abstract
A side-push type composite putty knife which comprises a handle
and a blade with a rear end of the blade inserted into a blade
receiving slot at a front end of the handle. The rear end of the
blade has a blade tang which is provided with a fixing notch on a
side thereof. A lateral gliding slot which is in communication with
the blade receiving slot is disposed at the front end of the handle
inside its casing. A latch and a reset spring pressing against a
first end of the latch are disposed inside the lateral gliding
slot. A pressing part is formed by a second end of the latch which
extends outwardly from a side of the casing at the front end of the
handle. A pin is disposed at the first end of the latch which
presses against the reset spring. When the blade tang is inserted
into the blade receiving slot at the front end of the handle, the
pin engages with the fixing notch of the blade tang. The engagement
between the latch on the handle and the fixing notch on the blade
allows the handle and the blade of the present invention to be
removably assembled, and therefore fulfill the object of replacing
blades of different specifications on the same handle. Cost of use
will be lower accordingly and carrying the knives becomes more
convenient.
Inventors: |
WANG; Desheng; (Zhejiang,
CN) |
Correspondence
Address: |
WANG Desheng;NO. 10, 2ND XITA ROAD
WEST OF CITY INDUSTRY AREA, YONGKANG
ZHEJIANG
CN
|
Family ID: |
43533655 |
Appl. No.: |
12/538178 |
Filed: |
August 10, 2009 |
Current U.S.
Class: |
30/169 ;
15/236.01; 30/337 |
Current CPC
Class: |
E04F 21/32 20130101 |
Class at
Publication: |
30/169 ; 30/337;
15/236.01 |
International
Class: |
E04F 21/32 20060101
E04F021/32 |
Claims
1. A side-push type composite putty knife which comprises a handle
(1) and a blade (2) with a rear end of the blade (2) inserted into
a blade receiving slot (11) at a front end of the handle (1),
characterized in that the rear end of the blade (2) has a blade
tang (21) which is provided with a fixing notch (22) on a side
thereof; a lateral gliding slot (11) which is in communication with
the blade receiving slot (11) is disposed at the front end of the
handle (1) inside its casing; a latch (4) and a reset spring (5)
pressing against a first end of the latch (4) are disposed inside
the lateral gliding slot (3); a pressing part (41) is formed by a
second end of the latch (4) which extends outwardly from a side of
the casing at the front end of the handle; a pin (42) is disposed
at the first end of the latch (4) which presses against the reset
spring (5); when the blade tang (21) is inserted into the blade
receiving slot (11) at the front end of the handle, the pin (42)
engages with the fixing notch (22) of the blade tang (21).
2. The side-push type composite putty knife as in claim 1,
characterized in that a blocking step (31) is disposed inside the
gliding slot (3) to prevent the latch (4) from slipping off, and a
protrusion corresponding to the blocking step (31) is disposed on
the latch (4).
3. The side-push type composite putty knife as in claim 1,
characterized in that the latch (4) is disposed at a lower side of
the blade receiving slot (11), and the pin (42) is formed by
protruding upwardly from the first end of the latch (4) that
presses against the reset spring (5).
4. The side-push type composite putty knife as in claim 1,
characterized in that a latch cover (6) is disposed on the pressing
part (41) of the latch (4).
5. The side-push type composite putty knife as in claim 1,
characterized in that the handle is formed by a metal handle member
(12), a plastic handle member (13) and a soft leather handle member
(14) disposed from inside to outside, with the blade tang (21)
inserted into the metal handle member (12).
Description
BACKGROUND OF THE INVENTION
[0001] The present invention relates to a hand tool for painting
and construction, especially a side-push type composite putty
knife.
[0002] A conventional putty knife usually has its blade fixedly
connected with its handle. However, as putty knives of different
widths should be used according to different construction
situations, users have to carry a number of putty knives with them
when they work outdoor. Carrying the knives is not only
inconvenient, but also increases the cost of use.
BRIEF SUMMARY OF THE INVENTION
[0003] In view of the disadvantages now present in the prior art,
the present invention provides a side-push type composite putty
knife that allows blades of different specifications to be replaced
on the same handle, thereby lowering the cost of use and bringing
greater convenience for users to carry the knife.
[0004] To attain this, the present invention adopts the following
technical proposals:
[0005] A side-push type composite putty knife which comprises a
handle and a blade with a rear end of the blade inserted into a
blade receiving slot at a front end of the handle; the rear end of
the blade has a blade tang which is provided with a fixing notch on
a side thereof; a lateral gliding slot which is in communication
with the blade receiving slot is disposed at the front end of the
handle inside its casing; a latch and a reset spring pressing
against a first end of the latch are disposed inside the lateral
gliding slot; a pressing part is formed by a second end of the
latch which extends outwardly from a side of the casing at the
front end of the handle; a pin is disposed at the first end of the
latch which presses against the reset spring; when the blade tang
is inserted into the blade receiving slot at the front end of the
handle, the pin engages with the fixing notch of the blade
tang.
[0006] A blocking step is disposed inside the gliding slot to
prevent the latch from slipping off, and a protrusion corresponding
to the blocking step is disposed on the latch.
[0007] The latch is disposed at a lower side of the blade receiving
slot, and the pin is formed by protruding upwardly from the first
end of the latch that presses against the reset spring.
[0008] A latch cover is disposed on the pressing part of the
latch.
[0009] The handle is formed by a metal handle member, a plastic
handle member and a soft leather handle member disposed from inside
to outside, with the blade tang inserted into the metal handle
member.
[0010] Due to the adoption of the above technical proposals, the
present invention has the following advantages over the prior
art:
[0011] The engagement between the latch on the handle and the
fixing notch on the blade allows the handle and the blade of the
present invention to be removably assembled, and therefore fulfill
the object of replacing blades of different specifications on the
same handle. Cost of use will be lower accordingly. Besides, spare
blades could be stored in a simple blade container for carrying
around, thus enhance convenience of use. Furthermore, to replace
the blade, it is only necessary to press the latch on one side to
release the pin of the latch from the fixing notch on the blade
tang. Disassembling and assembling of the blade could be achieved
easily and quickly.
BRIEF DESCRIPTION OF THE DRAWINGS
[0012] FIG. 1 shows a top view of the side-push type composite
putty knife of the present invention before assembly.
[0013] FIG. 2 shows a top view of the side-push type composite
putty knife of the present invention after assembly.
[0014] FIG. 3 shows a sectional view along line A-A of FIG. 2.
DETAILED DESCRIPTION OF THE INVENTION
[0015] As illustrated in FIGS. 1, 2 and 3, the side-push type
composite putty knife of the present invention comprises a handle 1
and a blade 2 with a rear end of the blade 2 inserted into a blade
receiving slot 11 at a front end of the handle 1. The rear end of
the blade 2 has a blade tang 21 which is provided with a fixing
notch 22 on a side thereof. A lateral gliding slot 3 which is in
communication with the blade receiving slot 11 is disposed at the
front end of the handle 1 inside its casing. A latch 4 and a reset
spring 5 pressing against a first end of the latch 4 are disposed
inside the lateral gliding slot 3. A pressing part 41 is formed by
a second end of the latch 4 which extends outwardly from a side of
the casing at the front end of the handle 1. A latch cover 6 is
disposed on the pressing part 41 of the latch 4 for the comfort of
pressing. A pin 42 is disposed at the first end of the latch 4
which presses against the reset spring 5. When the blade tang 21 is
inserted into the blade receiving slot 11 at the front end of the
handle, the pin 42 engages with the fixing notch 22 of the blade
tang 21.
[0016] As mentioned above, to assemble the blade, press the latch 4
of the pressing part 41 to one side (in the direction indicated by
the arrow in FIG. 1) first so that the pin 42 on the latch 4 moves
towards one side, and then insert the blade tang 21 into the blade
receiving slot 11 at the front end of the handle 1 until the entire
blade tang 21 is inserted therein; release the pressing part 41 and
the latch 4 will return to its original position in the direction
indicated by the arrow in FIG. 2 under the effect of the reset
spring 5; meanwhile, the pin 42 on the latch 4 engages with the
fixing notch 22 on the blade tang 21 and lock the handle 1 and the
blade 2 together. To replace the blade, press the latch 4 on one
side to release the pin 42 of the latch 4 from the fixing notch 22
on the blade tang 21 to remove the blade and then insert another
blade of the desired specification.
[0017] As illustrated in FIG. 3, a blocking step 31 is disposed
inside the gliding slot 3 to prevent the latch 4 from slipping off,
and a protrusion 43 corresponding to the blocking step 31 is
disposed on the latch 4. The latch 4 is disposed at a lower side of
the blade receiving slot 11, and the pin 42 is formed by protruding
upwardly from the first end of the latch 4 that presses against the
reset spring 5.
[0018] As illustrated in FIGS. 1 and 2, in order to enhance the
rigidity of the handle, the handle 1 is formed by a metal handle
member 12, a plastic handle member 13 and a soft leather handle
member 14 disposed from inside to outside; the blade tang 21 is
inserted into the metal handle member 12.
* * * * *