U.S. patent application number 10/759451 was filed with the patent office on 2004-07-29 for reciprocating saw holder.
Invention is credited to Lovell, Kelton W., McKenzie, Timothy T., Melvin, Jason.
Application Number | 20040145126 10/759451 |
Document ID | / |
Family ID | 24551614 |
Filed Date | 2004-07-29 |
United States Patent
Application |
20040145126 |
Kind Code |
A1 |
Lovell, Kelton W. ; et
al. |
July 29, 2004 |
Reciprocating saw holder
Abstract
A reciprocating saw includes a saw blade that is connected to a
hand held driver for reciprocating the saw blade to perform a cut.
A bit holder and a blade holder is used to provide connection
between the saw blade and the handle of the hand held driver. The
bit holder includes a connecting mechanism for connecting the bit
holder to the hand held driver. The blade holder provides a
connection between the saw blade and the bit holder. The blade
holder includes a holder body and a hex-shaped shank extending
rearwardly from the holder body. The shank further includes a first
holding mechanism for coupling the holder to the bit holder at the
rear end and a second holding mechanism for coupling the saw blade
to the holder at the forward end.
Inventors: |
Lovell, Kelton W.;
(Baltimore, MD) ; McKenzie, Timothy T.;
(Baltimore, MD) ; Melvin, Jason; (Towson,
MD) |
Correspondence
Address: |
HARNESS, DICKEY & PIERCE, P.L.C.
P.O. BOX 828
BLOOMFIELD HILLS
MI
48303
US
|
Family ID: |
24551614 |
Appl. No.: |
10/759451 |
Filed: |
January 16, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10759451 |
Jan 16, 2004 |
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10310312 |
Dec 5, 2002 |
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10310312 |
Dec 5, 2002 |
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09636374 |
Aug 11, 2000 |
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6546633 |
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Current U.S.
Class: |
279/145 |
Current CPC
Class: |
Y10T 279/3418 20150115;
Y10T 279/17803 20150115; B23D 51/10 20130101 |
Class at
Publication: |
279/145 |
International
Class: |
B23B 031/02 |
Claims
What is claimed is:
1. A blade holder for providing connection between a saw blade and
a bit holder, comprising: a holder body adapted for providing
connection to the saw blade at the forward end of the blade holder;
a hex-shaped shank extending rearwardly from the holder body for
coupling the blade holder to the bit holder; and wherein the blade
holder is cast around a tail of the saw blade.
Description
CROSS-REFERENCE TO RELATED APPLICATIONS
[0001] This application is a divisional of U.S. patent application
Ser. No. 10/310,312, filed on Dec. 5, 2002 which is a divisional of
U.S. patent application Ser. No. 09/636,374, filed on Aug. 11,
2000, now U.S. Pat. No. 6,546,633, issued on Apr. 15, 2003. The
disclosure of the above applications is incorporated herein by
reference.
FIELD OF THE INVENTION
[0002] The present invention relates generally to reciprocating
saws, and more particularly, to quick change reciprocating saws
adapted for use in hand held drivers, within which operators are
permitted to purposefully switch between several saw blades.
BACKGROUND OF THE INVENTION
[0003] Portable reciprocating saws, including a variety of handsaws
and the like, have been generally known in the art for some time,
handsaws being commonly used tools for performing a cut. Since
there are different types of saw blades with different sizes, the
operator has to have a number of different types of saw blades in
order to perform a cut on various objects the operator may
encounter. However, currently available handsaws have set blades
that are cast around or fixedly attached to the handle by other
methods, thus one blade cannot be switched to another when the
operator needs different sizes or types of saw blades.
[0004] Therefore, it would be desirable to provide a reciprocating
handsaw that allows the operator to easily and securably change
from one saw blade to another when performing tasks that require
more than one saw blade.
[0005] Moreover, it would be further desirable to provide a
reciprocating handsaw that can be attached to readily available
handles of hand held drivers which can also be interchanged with
different types of bits to perform various functions.
SUMMARY OF THE INVENTION
[0006] In accordance with the present invention, a reciprocating
saw includes a saw blade that is connected to a hand held driver
for reciprocating the saw to perform a cut. A bit holder and a
blade holder is used to provide connection between the saw blade
and the handle of the hand held driver. The bit holder includes a
connecting mechanism for connecting the blade holder to the hand
held driver. The blade holder provides a connection between the saw
blade and the bit holder. The blade holder includes a holder body
and a hex-shaped shank extending rearwardly from the holder body.
The shank further includes a first holding mechanism for coupling
the holder to the bit holder at the rear end and a second holding
mechanism for coupling a saw blade to the holder at the forward
end.
[0007] Further areas of applicability of the present invention will
become apparent from the detailed description given hereinafter. It
should be understood however that the detailed description and
specific examples, while indicating preferred embodiments of the
invention are intended for purposes of illustration only, since
various changes and modifications within the spirit and scope of
the invention will become apparent to those skilled in the art from
the following detailed description.
BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The present invention will become more fully understood from
the following detailed description and the accompanying drawings,
in which:
[0009] FIG. 1 is an exploded perspective view of the reciprocating
saw having a set screw holder design, adapted for use in a hand
held driver according to a first embodiment of the present
invention;
[0010] FIG. 2 is a perspective view of the set screw holder design,
adapted for use in the reciprocating saw;
[0011] FIG. 3A is a perspective view of the cylinder, adapted for
use in the set screw holder design of the reciprocating saw;
[0012] FIG. 3B is a perspective view of the sleeve, adapted for use
in the set screw holder design of the reciprocating saw;
[0013] FIG. 3C is a sectional view of the set screw holder
according to a first embodiment of the present invention adapted
for use in the reciprocating saw.
[0014] FIG. 3D is a perspective view of the set screw for use in
the set screw holder of FIG. 3C;
[0015] FIG. 3E is a perspective view of a pin for use in the set
screw holder of FIG. 3C;
[0016] FIG. 4A is a sectional view of the set screw holder design
according to a second embodiment of the present invention, adapted
for use in the reciprocating saw;
[0017] FIG. 4B is a perspective view of a set screw according to
the second embodiment of the present invention, adapted for use in
the set screw holder design of the reciprocating saw;
[0018] FIG. 5A is a sectional view of the set screw holder design
according to a third embodiment of the present invention, adapted
for use in the reciprocating saw;
[0019] FIG. 5B is a perspective view of a set screw having an
integral pin according to a third embodiment of the present
invention, adapted for use in the set screw holder design of the
reciprocating saw;
[0020] FIG. 6 is a sectional view of a ball type blade holder
according to a fourth embodiment of the present invention adapted
for use in the reciprocating saw;
[0021] FIG. 7 is an exploded perspective view of the reciprocating
saw having a die cast blade holder, adapted for use in the hand
held driver according to a fifth embodiment of the present
invention;
[0022] FIG. 8 is a perspective view of the die cast holder, adapted
for use in the reciprocating saw;
[0023] FIG. 9 is an exploded perspective view of the reciprocating
saw having a spring clamp holder, adapted for use in a hand held
driver according to a sixth embodiment of the present
invention;
[0024] FIG. 10 is a perspective view of the spring clamp holder
having a clamp assembly, adapted for use in the reciprocating
saw;
[0025] FIG. 11 is a perspective view of the body of the spring
clamp holder, adapted for use in the reciprocating saw;
[0026] FIG. 12 is a perspective view of the lever of the spring
clamp assembly, adapted for use in the spring clamp holder of the
reciprocating saw;
[0027] FIG. 13 is a perspective view of the pin of the spring clamp
assembly, adapted for use in the spring clamp holder of the
reciprocating saw; and
[0028] FIGS. 14A-C are front views depicting the free, bottom, and
top positions, respectively, of the spring of the clamp assembly,
adapted for use in the reciprocating saw according to the present
invention.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0029] With reference to the drawings, one embodiment of a
reciprocating saw 10 is illustrated in FIG. 1 to generally include
a saw blade 12 connected to a handle 18 of a hand held driver via a
set screw holder 14 and a quick release bit holder 16. As is
described in detail below, the saw blade 12 is connected to the set
screw holder 14 which includes a connecting assembly at both ends
to provide connection between the saw blade 12 and the bit holder
16. The bit holder 16 is coupled for rotation with the handle 18
and is configured to permit the operator to easily and securably
connect the hand held driver 18 to the saw blade 12 for driving
engagement in order to reciprocate the saw blade 12 to perform a
cut. A preferred commercially available quick release bit holder is
available under the trade name RAPID LOAD manufactured by Black and
Decker Corporation, Towson, Md. It should be appreciated that other
commercially available bit holders may also be used so long as the
bit holder can permit easy and securable connection to the hand
held driver 18. In addition, a quick release bit holder of the type
illustrated herein is also more completely described in U.S. Pat.
No. 6,053,675, issued Apr. 24, 2000, assigned to the assignee of
the present application, and entitled "Quick-Acting Tool Bit
Holder", the disclosure of which is herein incorporated by
reference.
[0030] As is best illustrated in FIG. 2, the set screw holder 14 is
configured to releasably hold the saw blade 12, and is connectable
to the bit holder 16. The set screw holder 14 generally includes a
cylinder portion 26 and a sleeve 24 as is best illustrated in FIGS.
3A and 3B, respectively. The cylinder portion 26 includes a body
portion 28 and a shank 20 extending rearwardly from the rear end of
the body 28 to provide a connection between the bit holder 16 and
the set screw holder 14. The shank 20 is hex-shaped and includes a
detent recess 22 for coupling the set screw holder 14 to the bit
holder 16. The detent recess 22 of the shank 20 is engaged within
the bit holder 16 in the operative position. An operator can pull
back on the outer collar of the bit holder 16 to quickly release
the shank 20 from the bit holder 16.
[0031] With reference to FIGS. 3A-B, a cylinder portion 26 and a
sleeve 24 of set screw holder 14 are described in more detail. FIG.
3A illustrates the cylinder portion 26 having a body 28 and the
shank 20. The body 28 includes a slot 29 extending rearwardly from
a forward cylinder face 30 to accommodate the tail of the saw blade
12. Those skilled in the art will appreciate that the specific
configuration may vary to accommodate different types and sizes of
saw blades 12 without departing from the scope of the invention.
FIG. 3B illustrates the sleeve 24 that is configured to cooperate
with the outer surface of the body 28 of cylinder portion 26. The
sleeve 24 has a length that is substantially the same as the body
28 of the cylinder portion 26, and an inner diameter that is
substantially the same as the outer diameter of the body 28. The
sleeve 24 further includes a smooth faced hole 25 on one side to
receive a set screw 36 as shown in FIGS. 2 and 3C.
[0032] Referring now to FIGS. 3C-3E of the drawings, the set screw
holder 14 according to a first embodiment of the present invention
is illustrated. The body 28 of the cylinder portion 26 includes a
smooth faced aperture 23 disposed through one side of the body
which opens to the slot 29. The cylinder 28 also includes a
threaded radial aperture 27 disposed on the other face of the slot
29. The aperture 23 receives a pin 32 (FIGS. 3C, 3E) and the
threaded radial aperture 27 receives a set screw 36 (FIGS. 3C, 3D).
The pin 32 is also received in a hole 12a in the tail end of the
saw blade 12. The sleeve 24 is slid over the body 28 of the
cylinder portion 26 in order to maintain the pin 32 in the aperture
23. The set screw 36 is inserted through the hole 25 in the sleeve
24 and threadedly engaged with the threaded radial aperture 27 in
the body 28 to secure the sleeve 24 in place. The set screw 36 is
tightened so as to press the tail end of the saw blade 12 against a
side wall of the slot 29. The saw blade 12 may be removed from the
set screw holder 14 by drawing back the set screw 36, axially
sliding the sleeve 24 to expose the pin 32 and removing the saw
blade 12 from engagement with the pin 32.
[0033] Referring now to FIGS. 4A-B of the drawings, a set screw
holder 14' according to a slightly modified second embodiment of
the present invention is illustrated wherein like reference
numerals are used to designate the same or similar elements as
described above. The body 28 of the cylinder portion 26' includes a
smooth-faced tapped hole 23' disposed on one face of the slot 29.
The cylinder 28' also includes a threaded radial aperture 27
disposed on the other face of the slot 29. The tapped hole 23'
receives a conical end portion 32 (best shown in FIG. 4B) of set
screw 36' and the radial aperture 27 receives a threaded portion 33
of set screw 36. The conical end portion 32 is brought into
engagement with a hole 12a in the tail of the saw blade 12. The
conical end portion 32 is configured to abut with the hole 12a of
the saw blade 12 to pinch the saw blade against the side wall of
slot 29. The set screw 36 is threaded and configured to
cooperatively engage with the threaded radial aperture 27 of the
cylinder 26.
[0034] As is best illustrated in FIG. 4A, the cylinder portion 26'
is inserted into the bore 21 of the sleeve 24 which is generally
circular in configuration. The cylinder portion 26' is rotationally
aligned such that the radial aperture 27 aligns with the smooth
faced hole 25 of the sleeve 24. To engage the saw blade 12 with the
set screw holder 14, the set screw 36 is inserted through the
smooth hole 25 of sleeve 24 and into the threaded aperture 27 of
the cylinder portion 26 after insertion of the saw blade 12. The
conical end 31 abuts the surface of the aperture 12a. The saw blade
12 may be removed from the set screw holder 14 by drawing back the
set screw 36, allowing the conical end 31 to disengage from hole
12a and removing the saw blade 12 from engagement with the cylinder
portion 26.
[0035] With reference to FIGS. 5A-B of the drawings, the set screw
holder 14 according to a third embodiment of the present invention
is described in more detail. The body portion 28" of the cylinder
26" includes a threaded radial aperture 27 disposed on one face of
the slot 29 for receiving a set screw 36" as shown in FIG. 5B. The
set screw 36" includes an integrally formed locating tip 35 having
substantially the same radius as that of the hole 12a on the tail
of the saw blade 12. The set screw 36" also includes a threaded end
37 for engaging with the threaded radial aperture 27 of the
cylinder portion 26". To engage the saw blade 12 with the set screw
holder 14, the cylinder portion 26" is inserted into the bore 21 of
the sleeve 24, and the cylinder portion 26 is rotationally aligned
so that the radial aperture 27 aligns with the smooth faced hole 25
of the sleeve 24. The saw blade 12 is placed into the slot 29 from
the forward face 30 until the hole 12a in the tail of the saw blade
12 aligns with the radial aperture 27 of the cylinder 26. The set
screw 36" is then inserted inwardly from the smooth faced hole 25
of the sleeve 24. The locating tip 35 of the set screw 36" is then
located in the hole 12a of the tail of the saw blade 12 and the
threaded end 37 provides support to hold the saw blade 12 in place
against the side of slot 29. The saw blade 12 may be removed from
the set screw holder 14 simply by unscrewing the set screw 36", and
removing the saw blade 12 from engagement with the locating tip
35.
[0036] With reference to FIG. 6 of the drawings, a ball-type blade
holder 114 according to a fourth embodiment of the present
invention is illustrated. The ball-type blade holder 114 generally
includes a cylinder portion 116, and a collar 118. As described
above, the cylinder portion 116 includes a hex-shaped shank 120
having a detent 122 for engaging with a bit holder 16 described
above. The cylinder portion 116 further includes a slot 124
extending rearwardly from the forward face 126, and a radial
aperture 128 extending through to one face of the slot 124. A ball
130 having a slightly smaller diameter than that of the radial
aperture 128 is placed in the radial aperture 128, and a portion of
the ball 130 extends into the slot 124 in its engaged position. The
collar 118 includes a chamber 132 near a rearward face of the
cylinder portion 116 for accommodating a spring 134 and a spring
clip 136. Collar 118 also includes an enlarged inner cavity 138 for
allowing radial movement of the ball 130. The enlarged cavity 138
is configured to form a ramp 140 which terminates at an inwardly
extending flange 142 of the collar 118 when assembled in order to
define a passage for the ball 130. The spring clip 136 is disposed
near the rear end of the sleeve for retaining the spring 134 in the
chamber 132, and the spring 134 is placed in the passage defined by
the spring clip 136 and the chamber 132 for biasing the collar 118
to an engaged position.
[0037] For engaging the saw blade 12 with the ball-type blade
holder 114, the collar 118 is pushed rearwardly against the spring
force, so that the forward end 142 of the enlarged cavity 138 is
aligned with the ball 130. The ball 130 is then free to move
radially outward in the enlarged cavity 138 allowing the saw blade
12 to be inserted in the slot 124 of the cylinder portion 116.
After the insertion of the saw blade 12, the ball 130 is locked in
the rear end 144 of the enlarged cavity 138 with a portion of the
ball 130 extending into the hole 12a formed in saw blade 12. The
extending portion of the ball 130 retains the saw blade 12 for
resisting inadvertent or unintended removal of the saw blade 12 in
its engaged position. The spring 134 keeps the collar 118 pushed
forward, and the narrow portion of the ramp 140 in the enlarged
cavity 138 of collar 118 retains the ball 130 in place. Similarly,
the saw blade 12 may be removed from the ball-type blade holder 114
simply by pulling back the collar 118 and removing the saw blade 12
since the ball 130 is allowed to disengage from the hole 12a.
[0038] Turning now to FIG. 7 of the drawings, a fifth embodiment of
the reciprocating saw 50 is illustrated to generally include the
saw blade 12 connected to the handle 18 of the hand held driver via
the bit holder 16 and a die cast holder 52. The bit holder 16 and
hand held driver 18 are of the types described in more detail in
the description of the previous embodiments. Those skilled in the
art will appreciate that other types of bit holders and hand held
drivers may be used to accommodate different types of saw blades 12
without departing from the scope of the present invention.
[0039] FIG. 8 illustrates the die cast holder 52 (with the blade 12
removed for clarity) having a body 53 and a shank 20 extending
rearwardly from the body 53 to provide connection between the bit
holder 16 and the die cast holder 52. The shank 20 is hex-shaped
and includes a detent recess 22 for releasably coupling the die
cast holder 52 to the bit holder 16. The detent recess 22 permits
the operator to purposefully remove the die cast holder from its
engaged position with the bit holder 16. When the detent recess 22
is in the operative position, the bit holder 16 retains the detent
recess 22 of the shank 20 against axial engagement. In this
embodiment of the present invention, the saw blade 12 is cast
permanently in slot 54 which is shown in FIG. 8 wherein the saw
blade 12 has been removed for clarity. Several saw blades with
different sizes and types may be cast within a die cast holder 52
in one standard die 53 having a size and weight suitable for
accommodating various types of saw blades 12. Thus, the die cast
reciprocating saw 50 allows the user to switch quickly from one saw
blade to the next when needed.
[0040] With reference to FIG. 9, a sixth embodiment of the
reciprocating saw 200 is illustrated to include the saw blade 12
connected to the handle 18 of the hand held driver via the bit
holder 16 and a clamp holder 202. As is described in detail below
with respect to FIG. 10, the tail of the saw blade 12 is connected
to the forward end of the clamp holder 202 with a clamp assembly
205 providing secure connection to the saw blade 12. The rear end
of the clamp holder 202 is connected to the bit holder 16 via the
hex-shaped shank 20 having a detent recess 22 shown in FIG. 10. The
detent recess 22 permits the operator to retain the clamp holder
202 within the bit holder 16. The bit holder 16 is coupled to the
handle 18 of the hand held driver. A more detailed description of
the bit holder and the hand held driver are given in the
aforementioned references.
[0041] FIG. 10 shows a perspective view of the clamp holder 202 to
include a body 204 and the clamp assembly 205. As briefly mentioned
above, the clamp holder 202 is configured to accommodate the saw
blade 12 at one end and has a shank 20 which engages the bit holder
202 at the other end. The body 204 is cast around the rearwardly
extending hex-shaped shank 20. As is described below, each side of
body 204 includes a pivot mount 228, a spring mount 230 and an
angled slot 222 for accommodating the clamp assembly 205. As is
best illustrated in FIG. 11, the body 204 further includes a slot
226 extending rearwardly from a forward face 224 of the body 204.
The slot 226 is configured to receive the tail of the saw blade 12.
Those skilled in the art would appreciate that the width and length
of the slot 226 may be varied to accommodate various types of saw
blades with different sizes and shape.
[0042] With reference to FIGS. 12, 13, and 14A-C, each part of the
clamp assembly 205 is described in detail below. The clamp assembly
205 is coupled to the body 204 of the clamp holder 202 for movement
between a clamped position and a released position for releasably
coupling the saw blade 12 to the clamp holder 202. More
particularly, the clamp assembly 205 generally includes a lever
206, a roller 208 and a pair of biasing springs 210.
[0043] FIG. 12 illustrates the U-shaped lever 206 of the clamp
assembly 205 to include a pair of opposed legs 234 having apertures
236. Each of the radial apertures 236 are disposed generally at the
midpoint of each of the legs, so as to provide connection between
the lever 206 and the pivot mounts 228 of the body 204 of the clamp
holder 202. The pair of apertures 236 allow the lever 206 to pivot
about the pivot mounts 228 disposed on the body 104. The lever 206
further includes a pair of U-shaped slots 237 formed at the tips of
the legs 234. The U-shaped slots 237 permit the ends 233 of the
roller 208 to easily engage with the lever 206 by sliding into the
slots 237.
[0044] Turning now to FIG. 13 of the drawings, the roller 208 is
illustrated to generally include a pair of outer ends 233
integrated with both ends of the intermediate body portion 231
having a groove 232 at its midpoint. The intermediate body portion
231 has a diameter slightly less than that of the angled slots 222
so as to allow the roller 208 to ride therein, and has a width that
is substantially the same as that of the body 204 of the clamp
holder 202. The outer ends 233 have a smaller diameter than that of
the intermediate body portion 231, and are engaged by the biasing
springs 210. The groove 232 has a width that is substantially the
same as that of the slot 226, and cooperatively retains the tail of
the saw blade 12.
[0045] With particular reference to FIGS. 14A-C of the drawings,
the biasing spring 210 is illustrated in detail to show three
different angular positions of the biasing spring 210 depending on
the location of the lever 206 of the clamp assembly 205. The spring
210 includes a hook portion 238 formed at one end of the coiled
portion 242, and a looped portion 240 formed at the other end of
the coiled portion 242. The looped portion 238 is secured over the
spring mount 230 formed on the body 204. The looped portion 240 is
secured over the outer ends 233 of the roller 208 for biasing the
roller 208 toward a forward engaged position within the angled slot
222.
[0046] FIG. 14A shows the biasing spring 210 in its free position.
FIG. 14B shows the biasing spring 210 in its mounted position
within which the looped portion 240 presses the roller 208 in a
forward direction along the angled slots 222. In this embodiment, a
spring force of approximately 8 Newton (N) is applied to the looped
portion 240, and the looped portion 240 is shifted inwardly about
67.2 degrees from its free position (shown in phantom). FIG. 14C
shows the biasing spring 210 in its rearward released position
within which the looped portion 240 is pressed rearwardly by
pivoting the upper portion of lever 106 forward. In this
embodiment, a force of approximately 12.5 Newton (N) is applied to
the looped portion 240, and the looped portion 240 is shifted
inwardly about 97.6 degrees from its free position (shown in
phantom). Those skilled in the art would appreciate that the force
and the angle described above may be varied to accommodate
different types of biasing springs and different types of saw
blades.
[0047] Referring now back to FIG. 10 of the drawings, the clamp
assembly 205 is coupled to the body 204 of the clamp holder 202 for
movement between a clamped position and a released (free) position
for releasably coupling the saw blade 12 to the clamp holder 202.
The roller 208 is biased by the pair of springs 210 via the lever
206 to engage the bottom surface of the tail of the saw blade 12.
The roller 208 in association with the biasing spring 210 and the
lever 206, urges the tail of the saw blade 12 against the upper
surface of slot 226 of the body 204 when the clamp assembly 205 is
in its engaged position. More particularly, the roller 208 rides in
the angled slots 222 in the body 204 such that the groove 232 in
the roller 208 clamps the saw blade 12 to the clamp holder 202. The
operator can move the roller 208 to its disengaged position through
forward pivoting movement of the upper portion of lever 206 about
the first mount 228. As the lever 206 is pressed forward, the legs
234 of the lever 206 move rearwardly along with roller 208. As
roller 208 moves along angled slots 222, the roller 208 disengages
from the tail of the saw blade 12.
[0048] From the above description, it should be appreciated that
the reciprocating saw 10, 50, 114, and 200 of the present invention
is adapted for use in association with the hand held driver 18. In
addition, the various embodiments of the set screw holder 14, the
ball-type holder 114, the die cast holder 52, and the clamp holder
202 are configured to easily and securably switch saw blades from
application to application. Therefore, the present invention would
allow the operator to be more versatile on the job site when more
than one handsaw is needed.
[0049] The foregoing discussion discloses and describes merely
exemplary embodiments of the present invention. One skilled in the
art will readily recognize from such discussion, and from the
accompanying drawings and claims, that various, changes,
modifications and variations can be made therein without departing
the spirit and scope of the invention as defined in the following
claims.
* * * * *