U.S. patent application number 11/268892 was filed with the patent office on 2007-05-10 for hack saw.
This patent application is currently assigned to Great Neck Saw Manufacturers, Inc.. Invention is credited to Qiu Jian Ping.
Application Number | 20070101590 11/268892 |
Document ID | / |
Family ID | 38002305 |
Filed Date | 2007-05-10 |
United States Patent
Application |
20070101590 |
Kind Code |
A1 |
Ping; Qiu Jian |
May 10, 2007 |
Hack saw
Abstract
A hack saw having a blade holding assembly and a blade lock
assembly. The blade lock assembly having moveable blade lock means
adapted to receive a blade therebetween, mechanism for moving the
blade lock means to a position to hold a blade in place.
Inventors: |
Ping; Qiu Jian; (Hangzhou,
CN) |
Correspondence
Address: |
WILLIAM COLLARD;COLLARD & ROE, P.C.
1077 NORTHERN BOULEVARD
ROSLYN
NY
11576
US
|
Assignee: |
Great Neck Saw Manufacturers,
Inc.
|
Family ID: |
38002305 |
Appl. No.: |
11/268892 |
Filed: |
November 8, 2005 |
Current U.S.
Class: |
30/517 |
Current CPC
Class: |
Y10T 83/9481 20150401;
B23D 49/10 20130101; B23D 51/10 20130101 |
Class at
Publication: |
030/517 |
International
Class: |
B23D 51/01 20060101
B23D051/01 |
Claims
1. A hack saw comprising a blade holding assembly and a blade lock
assembly, said blade lock assembly comprising moveable blade lock
means adapted to receive a blade therebetween, said blade lock
means comprising a pair of spaced separately and independently
moveable blade holding elements adapted to receive a blade
therebetween, means for moving of said moveable blade holding
elements toward each other from a position holding a blade in place
to a position releasing a blade for movement.
2. A hack saw as set forth in claim 1, wherein, at least a portion
of one of said blade holding elements being movable toward each
other.
3. A hack saw as set forth in claim 2, wherein each of said blade
holding elements comprise a pair of cams pivotally mounted on
pivots on said blade lock assembly.
4. A hack saw as set forth in claim 3, wherein each of said cams
comprise a control finger and lock base with said lock bases
adapted to receive a blade therebetween.
5. A hack saw as set forth in claim 4, wherein the control fingers
and lock bases of said cams are on opposite sides of said pivots
whereby pivoting the control fingers in one direction will pivot
the lock bases in the opposite direction.
6. A hack saw as set forth in claim 5, wherein control means are
provided and interposed between the control fingers of said cams to
cause them to pivot around the pivots in one direction away from
each other to thereby pivot the lock bases in opposite direction
toward each other.
7. A hack saw as set forth in claim 6, wherein said blade lock
assembly comprises a compartment into which said control means
extends.
8. A hack saw as set forth in claim 7, wherein said control means
are interposed between said lock fingers.
9. A hack saw as set forth in claim 8, wherein said control means
comprise a threaded member threadably mounted on said
compartment.
10. A hack saw as set forth in claim 9, wherein said blade holding
assembly comprises a u-shaped blade holder one leg of which has
means to hold a blade.
11. A hack saw as set forth in claim 10 wherein a blade-receiving
assembly extends from said blade lock assembly.
12. A hack saw as set forth in claim 11 wherein said
blade-receiving assembly extend rearwardly away from the blade lock
assembly in a direction opposite to the blade holding assembly.
13. A hack saw as set forth in claim 12, wherein said blade
receiving assembly comprises a plurality of offset spaced
partitions adapted to receive a blade therebetween.
14. A hack saw as set forth in claim 13, wherein said blade
receiving assembly is adapted to be mounted within a handle.
15. A hack saw comprising a blade holding assembly, a blade lock
assembly, and a blade receiving assembly, said blade lock
comprising blade holding means adapted to hold a blade.
16. A hack saw as set forth in claim 15 wherein said blade
receiving assembly comprises a plurality of offset spaced
partitions adapted to receive a blade therebetween.
17. A hack saw as set forth in claim 16, wherein said blade
receiving assembly is adapted to be mounted within a handle.
18. A hack saw as set forth in claim 17 wherein said blade holding
assembly comprises a u-shaped blade holder having means to receive
a blade.
Description
BACKGROUND
[0001] The present invention relates to a hack saw and more
particularly to close quarter hack saw which has a replaceable
blade.
[0002] Close quarter hack saws have been known for a number of
years. They consist of a frame or handle with a hack saw blade
mounted on and extending from the front of the handle. However,
some of such close quarter hacksaws may not easily be used or
manipulated for effective close quarter work. In other of such
close quarter hacksaws the blade may not be easily adjusted
relative to the handle and/or may not be easily replaced. Some of
such close quarter hack saws are expensive and complicated to
manufacture and/or which are difficult to use.
OBJECTS
[0003] The present invention overcomes these difficulties and has
for one of its objects the provision of an improved close quarter
hack saw which may be easily used for close quarter work.
[0004] Another object of the present invention is the provision of
an improved close quarter hack saw in which the blade may be easily
removed.
[0005] Another object of the present invention is the provision of
an improved close quarter hack saw in which the blade may be easily
adjusted relative to the handle.
[0006] Another object of the present invention is an improved hack
saw which is simple to use.
[0007] Another object of the present invention is an improved hack
saw which is simple and inexpensive to manufacture and
assemble.
[0008] Other and further objects of the invention will be obvious
upon an understanding of the illustrative embodiment about to
described, or will be indicated in the appended claims and various
advantages not referred to herein will occur to one skilled in the
art upon employment of the invention in practice.
DRAWINGS
[0009] A preferred embodiment of the invention has been chosen for
purposes of illustration and description and is shown in the
accompanying drawings forming a part of the specification,
wherein:
[0010] FIG. 1 is a perspective view showing the close quarter hack
saw of the present invention.
[0011] FIG. 2 is an exploded perspective view of the close quarter
hack saw of the present invention.
[0012] FIG. 3 is a sectional view taken along lines 3-3 of FIG.
1.
[0013] FIG. 4 is a sectional view taken along line 4-4 of FIG.
1.
[0014] FIG. 5 is a fragmentary side view, partly in section,
showing the manner of locking the blade in place.
[0015] FIG. 6 is a sectional view taken along line 6-6 of FIG.
5.
[0016] FIG. 7 is a fragmentary side view, partly in section,
showing the blade being released from its locked position.
[0017] FIG. 8 is a sectional view taken along line 8-8 of FIG.
7.
DESCRIPTION
[0018] Referring to the drawings, the close quarter hacksaw 1 of
the present invention comprises a handle 2 and a frame assembly
3.
[0019] The handle 2 has upper, lower and rear walls 4, 5 and 6,
respectively, with opposed side walls 8 and an open front 7 adapted
to receive at least a portion of the frame assembly 3.
[0020] The frame assembly 3 has a rear blade-receiving assembly 10,
a front blade-holding assembly 11 and an intermediate blade lock
assembly 12 which are preferably made integral (one piece) with
each other. The blade-receiving assembly 10 comprises upper, lower
and rear walls 15, 16 and 17, respectively, and is insertable in
the open front 7 of the handle 2 and held in place by means of any
well known fastening means (not shown) extending through openings 9
and 9A in the handle 2 and the blade-receiving assembly 10,
respectively. A plurality of staggered (offset) partitions 18 and
19 extend between the upper and lower walls 15-16 of the blade
holding assembly 10 on each side of its longitudinal center line to
provide a passageway 20 for a blade B.
[0021] The front blade-holding assembly 11 comprises and is in the
form of a u-shaped blade holder having a front leg 25 and a rear
leg 26 connected together by an upper base 27. The front leg 25 has
a u-shaped lower notch 28 to receive the front part of a blade B
therein. The rear leg 26 is connected to the intermediate blade
lock assembly 12. The blade B is slidably mounted within the rear
blade-receiving assembly 10 within the passageway 20 formed between
the spaced offset partitions 18-19 and is inserted in the notch 28
in the front leg 25.
[0022] The blade lock assembly 12 comprises a control compartment
30 formed by front, rear top and bottom walls 37, 38, 39 and 40,
respectively. The front wall 39 has a slot 36 therein to receive
blade B and the top wall has a threaded opening 42 therein. A blade
lock assembly L is provided and comprises a pair of moveable blade
lock elements preferably in the form of a pair of opposed cams 31
which are pivotally mounted on pivots 32 located in elongated
journals 33 on the front and rear walls 37 and 38 of the
compartment 30. Each cam 31 has an upper control finger 34 and a
lower lock base 35 from which the pivots 32 extend. The upper
control fingers 34 and lower lock bases 35 are on opposite sides of
the pivots 32 so that movement of the upper fingers 34 in one
direction will move the lower lock bases 35 in the opposed
direction and vice versa. The blade B is interposed between the
lower lock bases 35. The upper control fingers 34 swing on pivots
32 from a position away from each other to a position toward each
other and the lower lock bases 35 swing in the opposite direction.
As the cams 31 swing as described above, the pivots 32 slide up and
down the journals 33.
[0023] A controller 50 (in the preferred form of a thumb screw) is
threadably mounted by its threaded shaft 51 in the threaded opening
42 at the top of the control compartment 30. The lower end 52 of
the threaded shaft 51 extends within the control compartment 30 and
is interposed between the upper control fingers 34 of the cams 31
(FIGS. 5-8). When the controller 50 is screwed down and lowered, as
shown in FIGS. 5 and 6, its lower end 52 will spread the upper
control fingers 34 of the cams 31 apart around pivots 32 thereby
allowing the lower lock bases 35 to move toward each other to press
and bear against the blade B from both sides to grip and lock the
blade B in place. When it is desired to release the blade B, the
controller 50 is screwed in the opposite direction to move it
upwardly, as shown in FIGS. 7 and 8. Its lower end 52 moves
upwardly away from upper control fingers 34 of the cams 31 so that
they are now free to move toward each other around the pivots 32
and the lower lock bases 35 are free to move away from each other
and the blade B to release their grip on the blade B permit the
blade B to be adjusted or removed and replaced.
[0024] It will thus be seen that the present invention provides an
improved close quarter hack saw which may be easily used for close
quarter work in which the blade may be easily removed, in which the
blade may be easily adjusted relative to the handle, which is
simple to use and which is inexpensive to manufacture and
assemble.
[0025] As many and varied modifications of the subject matter of
this invention will become apparent to those skilled in the art
from the detailed description given hereinabove, it will be
understood that the present invention is limited only as provided
in the claims appended hereto.
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