close

Вход

Забыли?

вход по аккаунту

?

Патент USA US3019450

код для вставки
Feb. 6, 1962
R, J, KOPF ETAL
3,019,440
FASTENER ARRESTING DEVICE FOR A POWER ACTUATED TOOL
3 Sheets-Shea?l 1
Filed Jan. l2, 1955
QM
. d.
/NVf/V70RS
Row/and d Kopf
R03er
Marsh
„77M ÚM ß ¿QM
BY
ATTORNEYS
Feb. 6, 1962
R. J. KOPF ETAL
3,019,440
FASTENER ARRESTING DEVICE FOR A POWER ACTUATED TOOL
Filed Jan. l2, 1955
3 Sheets-Sheet 2
Í/VVf/V TORS
Row/ana’ d /fqnf
Roger Mars/7
BY
ya@
„6a/M ¿úw
A TTOR/VEYÓ'
Feb. 6,
R. J_ KOPF ETAL
FASTENER ARRESTING DEVICE FOR A POWER ACTUATED TOOL
Filed Jan. 12, 1955
3 Sheets-Sheet 3
INVENTORS
Row/and d. Kopf
Roger Mars/1
/ìïToRA/ßyâ
ff
Yttes
fice
atent
ßßlîái/i@
Patented Feb.. 6, 1962
E
FIG. 4 is a longitudinal sectional view of a second form
of catcher block and eXplosively-actuated tool;
3,til9,440
FIG. 5 is an end View of the tool in FIG. 4 looking
FASTENER ARRESTiNG DEVECE FÜR A
toward the left at the right end thereof with the catcher
block in the driveable unit releasing or its inoperative
POWER ACTUATED TOOL '
Rowland I. Kopf, Rocky River, and Roger Marsh, Hud
son, Ohio, assignors, by mesne assignments, to Olin
Mathieson Chemicai Corporation, a corporation of
position;
FIG. 6 is an end view, similar to FIG. 5, but with
catcher block in the driveable unit capturing or its opera
Virginia
Filed Jian. 1.2, 1955, Ser. No. 481,388
liti Claims. (Cl. 1--44.5)
This invention relates to improvements in power ac
tuated tools and more particularly to a power actuated
tool having a captive driveable unit.
One of the objects of the present invention is to pro
vide a power actuated tool wherein a fastener driven
thereby cannot escape into free tlight.
A further object of the present invention is to pro
vide a power actuated tool for driving a fastener into a
tive position;
10
FIG. 7 is a longitudinal sectional view taken along the
line 7--7 in FIG. 6 with the tool pressed against the
workpiece in tiring position and the driveable unit driven
to its normal penetration depth;
FIG. 8 is a transverse sectional view taken along the
line 8_3 of FlG. 7;
FIG. 9 is a longitudinal sectional view, similar to FIG.
7, but with dotted lines omitted for clarity and wherein
the operator has attempted to tire the driveable unit into
material having insuñicient resistance to penetration and
workpiece wherein the fastener is a captive within the
tool While it ís being driven but in which means are 20 the tool prevents free flight thereof;
FIG. l0 is a longitudinal sectional view of a third form
provided for detachment from the tool of at least the
piercing portion after driving thereof with the fastener
remaining firmly embedded in the workpiece.
of fastener arresting device adapted to be used on a tool
of the type shown in FIG. l with the tool in the loaded
position;
A further object of the present invention is to pro
FiG. l1 is a transverse sectional View taken along the
vide a power actuated tool for driving the piercing por 25
line 11--11 in FIG. 10;
tion of a fastener into a workpiece wherein said tool
FIG. l2 is a longitudinal sectional view similar to FIG.
includes an abutment means having energy absorbing
10 with the fastener driven to its normal depth of pene
means to absorb the energy of the driven fastener and to
tration;
prevent overdriving of said fastener.
FlG. 13 is a longitudinal sectional view similar to FIG.
A further object of the present invention is to pro 30
12 with the fastener driven into material having insuf
vide a power actuated tool for driving a fastener into a
Íicient resistance to penetration; while
workpiece with said tool preventing the escape of the
FiG. 14 is a longitudinal sectional view similar to FIG.
driven fastener into free flight, preventing overdriving of
10 but of a fourth form of fastener arresting device
a driven fastener into soft or relatively less resistant
materials, limiting free movement of a driven fastener 35 adapted to be used on a tool of the type shown in FIG. l.
Before the tool here illustrated is specifically described,
if it is deformed upon contact with the workpiece, and
it is to be understood that the invention here involved
minimizing likelihood of injury to personnel using or
is not limited to the structural details or arrangements of
parts here shown since tools embodying the present in
tool or parts vulnerable to damage if the tool is mis
40 vention may take various forms. It also is to be un
handled.
derstood that the phraseology or terminology herein em
A further object of the present invention is to pro
ployed is for purposes of description and not of limita
vide a power actuated tool with a resiliently loaded abut
tion since the scope of the present invention is denoted
ment means movable to an operative position for stop
by the appended claims.
ping free flight of a driveable unit in the tool as said
Those familiar with this art will recognize that this
tool moves into firing position and movable to an inop 45
invention may be applied in many ways. The invention,
erative position for releasing said drivable unit as said
in its broader aspects, includes al1 types of power actuated
tool moves into an inactive position.
tools with power actuation for such fastener driving tools
A further object of the present invention is to pro
including hydraulic, pneumatic, electromagnetic, eXplo
vide a power actuated tool characterized by its greater
safety in operation, more satisfactory driving of fasteners 50 sive powder charge, or any other suitable type power.
However, only the explosively actuated tool embodiment
thereby, structural simplicity, and ease of operation.
is described in detail herein. Tool 10 in FIG. l, for eX
Other features of this invention reside in the arrange
amule, is adapted to drive or set a fastener into the ñat
ment and design of the parts for carrying out their ap
surface of a workpiece 11.
propriate functions.
55
EXplosively-actuated tool i@ in FIG. 1 includes a mem
Other objects and advantages of this invention will be
ber with a passageway for confining and driving, such as
apparent from the accompanying drawings and descrip
the bore 15e of barrel 15, so that an explosive charge
tion mld the essential »features will be set forth in the
set off by trigger 16 can drive a driveable unit through
appended claims.
the barrel or along any suitable passageway from the
In the drawings:
60 breech or entry end toward the barrel muzzle: or discharge
FIG, l is a side elevational view of an explosive type
end and into workpiece 11. An eXample of an explo
power-actuated tool, partially in section, with a spring
sively-actuated tool on which the present invention may
mounted catcher block mounted on the barrel muzzle
be used is disclosed in the copending US. patent ap
observing the tool without using expendable parts in the
thereof and with the tool shown in the ñring pin uncooked
position;
plication entitled “Explosively-Actuated Tools,” Serial
65 No. 355,034, filed on May 14, 1953 by R. l. Kopf, R. W.
FIG. 2 is a longitudinal sectional view of the front
Henning and R. Marsh, now U.S. Patent No. 2,945,236
portion of the tool in FIG. l pressed against the work
piece into a firing position with a driveable unit driven
into a workpiece to its normal depth of penetration;
granted July 19, 1960.
In the aforementioned copending application entitled
from the driven driveable unit;
ing application eliminated but includes a housing 14
“Explosively Actuated Tools” to which reference may
FIG. 3 is a perspective view of the catcher block in the 70 be had for further disclosure if necessary, tool 10 in
FIG. 1 has the ñash shield and its sleeve in said cepend
position shown in FiG. l while the tool is being removed
3,019,440
3
4
with a sleeve portion Ma telescopically connected over
barrel 15 with said sleeve and barrel being mounted
for axial relative movement but keyed against relative
charge, such as cartridge 17 in FIGS. l-3, is also inserted
into the breech after which the breech of the tool is
rotative movement in the manner disclosed in said
against the workpiece 11, as shown by the tool in FIG. 2.
After trigger 16 is pulled, the fastener is driven by the
copending application, for example.
Housing f4- has
a firing means therein including a firing pin 18, biased
forwardly toward the barrel muzzle into an uncooked
position by compression spring I9, movable endwise in
closed so that the tool can be moved to tiring position
tool into the workpiece to its normal and desired penetra
tion shown in FIG. 2 wherein the front shoulder 32C
on the ram rather than abutment shoulder 32a normally
said housing between a rearward, cocked or active posi
limits the penetration thereof, when the parameters of
tion and a forward uncooked or inactive position for 10 fastener size, powder load and workpiece resistance are
respectively being capable or incapable of setting off the
not quite suñicient to do it alone.
explosive charge in cartridge case I7. When the barrel
The driveable unit may be held in the barrel bore close
muzzle on tool It? is pressed axially against workpiece
to the cartridge 17 in any suitable manner if necessary
11, sleeve 14a telescopes forwardly from the FIG. l
before the tool is fired so as to control the size of the
uncooked position to the FIG. 2 cocked position. In the 15 initial explosive charge chamber and to properly drive
movement to such position, a pin 15a carried by the
the fastener. This may take the form of friction be
barrel is engaged by a laterally projecting firing pin
tween barrel I0 and piston 32 or other suitable retain
pawl 2t) on ñring pin i8 to cock said firing pin against
ing means, and this is especially desirable when .the
the bias of spring 19. Trigger 16, pivotally mounted
barrel is pointed downwardly, as in FIG. 2, so as to
on housing 14, has a sear 16a for depressing firing pin
hold the fastener carrier piston against axial downward
pawl 20 against the >bias of its spring 21 to release it
movement under only the weight of the driveable unit.
from pin 15a. This serves as a means for manually
However, if the tool is tired so that there is a pos
releasing firing pin 18 in cocked position so that its
sibility of having the fastener escape into free Hight to
spring 19 can force it forwardly to set off the charge in
become a dangerous projectile, the safety feature pre
cartridge i7. When tool I@ is removed `from workpiece 25 vents this normal occurrence by engagement between
11, spring 24 between housing Id and barrel i5 serves
suitable abutment means when the driveable unit in any
as a means for normally biasing apart barrel 15 and
of these tools attempts to travel outwardly through the
housing 14 into the uncooked safety position shown in
barrel substantially beyond the FiG. 2 position. The
FIG. l.
tool barrel has a bore ide of uniform diameter through
In a conventional explosiveiy actuated tool, the fas 30 out most of its length of a size to permit free passage
tener is driven through the barrel and out of the muzzle
at high speed, so that if the tool barrel is not properly
of the driveable unit therethrough with no excess clear
ance. However, means is provided to arrest the forward
set against the workpiece or if the fastener is fired into
travel of the piston or ram while permitting free passage
unsuitable material, the fastener may escape into the
of the piercing portion of the fastener for workpiece pene
`air in free flight so as to become a dangerous projectile. 35 tration. This means includes an abutment means on the
It is therefore desirable for safety reasons to prevent
tool capable of coacting with the abutment means 32a
the escape of the fastener into free flight. This difliculty
on the piston or ram to prevent further axial travel of
may occur when using a conventional tool if the oper
the driveable unit through the barrel and thus to pre
ator attempts to fire the tool into the air instead of
Vent the free escape of the driveable unit from the tool.
against the workpiece, if the operator attempts to fire 40 Hence, the driveable unit is stopped as its piercing por
the tool into a workpiece having insufficient penetration
tion 31a emerges a predetermined distance beyond the
resistance so that the fastener travels completely through
barrel muzzle so as to control the penetration of the
the workpiece to escape into free flight, if the operator
workpiece or travel beyond the muzzle independently
fires the tool with the barrel axis substantially less than
of the resistance to penetration of the workpiece mate
90° with respect to the surface of the workpiece so that 45 rial or of the explosive driving force.
a ricochet occurs, etc. The present invention has solved
these, as well as many other problems by having a drive
able unit, including the fastener as well as a captive ram
This abutment means and its operative connection to
the tool may take various forms. In FIGS. 1_3, block
36 is mounted over the barrel muzzle and has a barrel
or fastener carrier piston, driven through the tool barrel
bore continuation 36e with an integral, inwardly directed
by the explosively actuating gases with this ram pre 50 ñange 36a, adapted to engage the piston shoulder 32a to
vented by appropriate means from escaping completely
prevent overtravel of unit 30. Helical extension spring
from the barrel. Hence, the fastener cannot escape into
23 is telescoped over the barrel and screwed into helical
free flight to become a dangerous projectile.
grooves in block 36 and into grooves formed in an
In the present disclosure, the tool I@ has in FIGS. 1-3
outwardly extending flange 15b. A pin 37 in FIG. l
a captive driveable unit 34) including fastener 31 detach 55 carried by block 36 normally travels in longitudinal
ably connected by screw threads to a fastener carrier,
groove 14b in the bore of sleeve 14E-a when the tool is
such as the element 32 here shown, which is designated
moved from the FIG. 1 to FIG. 2 positions. This con
herein as a piston, head or ram. The fastener has a
nection prevents axial movement of the tool to the
forwardly projecting piercing portion 31a for penetrat
FIG. 2 tiring position unless block 36 is screwed onto
ing the workpiece after being driven through the barrel 60 spring 23 until pin 37 and slot Mb register to assure
while the piston has an abutment means or shoulder 32a
to be described in further detail hereinafter. The ram
or piston is shown as being internally threaded to accept
the fastener, but in the event any fastener has an inter
proper mounting of block 36 on barrel f5 and assure
constant barrel length for accurate angle fire control, as
discussed hereinafter relative to the tool in FIGS. 4-9.
This construction provides greater safety in tool opera
nally threaded head, its ram or piston may be externally 65 tion as well as more satisfactory setting of the fasteners.
threaded to engage the fastener.
It prevents the free escape of a fastener. The tool opera
The safety features of the present invention are not
tor cannot dangerously fire the fastener into free flight,
required under normal conditions when there is no danger
as a dangerous projectile, by ñring the tool into the air
of having the fastener escape into free flight. During
instead of against the workpiece. If the workpiece does
tool loading, the piston 32 in FIGS. 1_3 is screwed onto 70 not have suiiicient resistance to penetration, there exists
the thread of fastener 3l so as to form the driveable
neither the danger that the fastener will emerge from
unit 30 and then this unit is inserted into the breech
the other side of the workpiece as a projectile in free
of the tool barrel 15. It will also be apparent herein
flight nor the danger that the fastener will be overdriven
after that the tool could be loaded from the muzzle
beyond the depth control established by the engagement
instead of the breech, if so desired. Then, an explosive 75 of the abutment shoulder 32a on the driveable unit and
3,019,440
6
flange 36a at the barrel muzzle. Substantial inclination
A modified form of sleeve 44a has a continuous slot or
of the barrel bore from the normal to the workpiece sur
face will not cause a ricochet since the tool preferably has
said angle tire control at excessive inclination and, in any
event, the fastener cannot escape into free ilight.
When the fastener' is driven either to the normal pene
groove 44b in the bore thereof and at least partially
helical in form for receiving a projecting pin 47 ou block
tration position of FIG. 2 or is driven lbeyond this point
until the abutments formed by members 32a and 36a
on about its axis of rotation in FIGS. 5 and 6 one cut
out having its edge forming the abutment means on the
tool by flange den and a second cut-out 46d larger than
engage, the driveable unit 3d in FIGS. l-3 can be re
46 to form a helical cam connection for rotating block
46 on barrel 45 in response to axial movement of sleeve
44a. Block 46 has circumferentially spaced apart there
moved frorn the bore extension 36e ofthe tool while the 10 the barrel bore with each registerable with the barrel
fastener remains embedded in the workpiece.
As shown in FIG. 2, the axial thickness of flange 36a
of block 36 is somewhat less than the axial spacing of
faces 32a and 32C of the piston or ram 32 shown sep
arately in FIG. 3.
In FIGS. l--3, both the fastener 3i and the fastener
carrier piston or captive ram 32 are easily disengaged as a
unit from the tool after tiring. In FIGS. l~3, a transverse
bore in diñerent positions of rotation. Hence, flange 46a
is operatively mounted on the barrel for movement into
either an operative position (FIG. 6 or 7) in alignment
with the barrel bore so as to be in the path of travel of
the driveable unit 30 and its abutment surface 32a there
on to be effective for stopping said unit or an inopera
tive position (FIG. 4 or 5) out of said path and out of
opening or side port 36h in the barrel block 3d leads
laterally from the barrel bore extension 36e immediately
above the shelf formed Áby the flange 36a to the outside
alignment with the barrel bore to permit removal of unit
3@ therefrom after the fastener has been driven. Move
ment of the tool sleeve axially over the barrel causes
flange 46a of block 4e through ring 43 to move between
of the barrel.
said positions by the operative connection therebetween.
This side port serves as a means for de
In FIGS. 4-5, forward movement of sleeve 44a rotates
block 46 from the inoperative position in FIGS. 4 and 5
bore and the parts have returned to the position shown 25 to the operative position in FIGS. 6 and 7. Bearing
ring 48 is rotatably mounted on the end of block 46 to
in FIG. l by the operator releasing the pressure on the
permit relative rotation between workpiece Il and block
housing, thus permitting spring 24 to cause the barrel and
46 when they are pressed together. In the operative
the housing to occupy an extended position. When the
position, workpiece 1I backs up the abutment means on
driveable unit has been driven sufficiently far so that the
abutment means engage, the captive ram or piston 32 is 30 the tool to help absorb 'the energy of the driveable unit
3i?. Hence, movement of the sleeve relative to the bar
laterally aligned with the port so that the tool is easily
rel between FIGS. 4 and 7 positions, for example, causes
removed by laterally withdrawing the tool therefrom.
not only movement of the abutment flange 45a on the
Sleeve 14a in FIG. l serves as a means for convering
block 4o between inoperative and operative positons but
port 36h in the firing position of FIG. 2 to protect the
operator and for uncovering port 36h for driveable unit 35 also causes movement of firing pin .i3 between uncocked
taching the tool from the driven driveable unit after the
driveable unit has stopped traveling through the barrel
removal in the inactive position of FIG. 1 off workpiece
l1 responsive to tool movement between these positions.
When block 36 is not assembled on the tool, it should
be noted that spring 2.3 in FIG. 2 does not extend far
and cocked positions. As the tool barrel muzzle is pressed
against the workpiece, the relative movement moves ñr
ing pin 13 to cocked position and moves the abutment
means on the tool to the FIG. 7 operative position.
enough forward so that it can be used to move the tool -
After trigger lo has been pulled to release tiring pin i8
into liring position. Hence, the tool cannot be tired in
unsafe condition without block 36.
Gas ports 15d in FIG. 2 are preferably provided in the
tool barrel to permit gas escape from behind piston 32
to tiring position and driveable unit 3@ is driven to the
FIG. 7 position or if the operator desires to return the
lift oft- the workpiece caused by the expanding pressure
of the gas acting against spring 23 in the barrel bore
cooked, safety position. Hence, the automatic operation
tive driveable unit 3d therein has the same structure and
mode of operation as unit 3ft in FIGS. l-3. The unit and
In FIGS. 4 and 7, groove 4417 in sleeve 44a is of con
tinuous form but has a helical portion and a longitudinal
tool to the safety position with tiring pin 13 uncooked
in the FIG. l position, he merely withdraws the tool
before unit 5d reaches the FÉG. 2 position so as not only 45 axially from workpiece il.. The relative movement moves
the abutment means on the tool to the FIG. 4 inoperative
to reduce the likelihood of high and dangerous pressures
position and moves the firing pin Iâ to the FIG. l un
developing in the tool barrel but also to minimize tool
of this invention cooperates perfectly with the operation
tending to move the tool if the unit Sii stops before the 50 of the tool disclosed in said copending application and
providing response to thrust against the workpiece and
abutment means engage.
said angle lire control.
The tool in FIGS. 4 to 9 will be next described. Cap
cartridge I7 may be loaded into the tool and the unit 55 portion. The helical portion rotates block 4d in response
held in the barrel bore close to cartridge I7 in any suit
to axial movement of sleeve
on barrel »45. The lon
able manner, such as mentioned for the FIGS. l~3 tool
gitudinal portion permits relative axial movement of
form. An abutment i eans on the tool coacts with the
abutment means 32a on the piston or ram as the unit
sleeve 44a on barrel 45 without «further rotating block
46 so that the tool may be tired in the same manner as
attempts to travel substantially beyond the FIG. 7 position 60 the tool disclosed in said copending application `without
in the same manner as when unit 36 attempts to travel
diniculty. The barrel length from bearing ring 4S to cock
beyond the FIG. 2 position.
ing pin 15a is constant as firing pin IS approaches the
The abutment means and its operative connection to
cocked position so that ñring pin pawl 2€) will always
the tool takes another form in FIGS. 4-9. Block 46
align in the same manner with trigger sear lon for proper
(corresponding to block 35 iu FIG. l) is mounted over 65 tiring. Also, when the tool barrel axis is tilted from the
the barrel muzzle with an integral, inwardly directed
perpendicular to the workpiece surface, the angle tire or
flange 46a, adapted to engage piston shoulder 32a to
tilt control described in said copending application still
prevent overtravel of unit 30. Helical extension spring
prevents firing of said tool because trigger sear 16a and
23 is telescoped over the barrel and screwed into helical
pawl 2t) do not align at approximately the same tilt since
grooves in block 46 and into grooves formed in an ex
this barrel length remains constant over the range of per
tending flange on the tool barrel (similar to flange lêía
missible tilt.
in FIG. l but not shown).
When block 45 is not assembled on the tool, it should
Spring 23 operatively connects block 46 to a modified
be noted that spring 23 in FIG. 7 does not extend far
form of barrel 45 for rotation of said block about an axis
parallel to the axis of the olf-center bore in barrel 45. 75 enough forward so that it can be used to move the tool
3,019,44e
5_2!
into tiring position. Hence, the tool cannot be íired in
and piston serves as resilient energy absorbing means for
shoulder 52e on the ram normally limits the penetration
thereof.
In FIGS. 10-13, the abutment means and its operative
connection to the tool takes another form. A crossbar
56 extends transversely through slots or elongated aper
absorbing the energy of the explosive charge during stop
ping of piston 32 by permitting axial movement of sepa
aperture or slot 52h in piston 52, elongated in the direc
unsafe condition without block 46.
Spring 23 provides a form of lost motion connection
in the embodiments of FIGS. 1-9 since it with the block
tures 55a in a modified form of barrel S5 and an elongated
rate block 36 of FIGS. 1-3 and. of block d6 from FIG. 7
to FIG. 9 relative to its associated barrel wherever there
tion of the barrel axis 4to form a lost motion connection be
such as when the tool operator `attempts to tire it into
each barrel to be located between and to operatively con
nect Crossbar 56 and its associated barrel by an outwardly
tween piston 52 and its associated barrel 55. A helical
is danger that the fasteners will escape into free iiight, 10 compression spring 53 and ring 52’ are telescoped over
material having insufñcient resistance to penetration.
Normally abutment shoulder 32a is spaced from 36a
extending integral ñange SSb on barrel 55 in FIGS. 10-13.
(FIG. 2) and from ñange 46a (FIG. 7). Compare, for
Spring 53 also serves as resilient energy absorbing
example, FIG. 7 showing normal penetration depth with 15 means for absorbing the energy of the expiosive charge
respect to FIG. 9. It should be apparent that 'after
during stopping of piston 52 by permitting axial move
reaching full stretch spring 23 integrates the block and
nient of Crossbar S6 from FIG. 12 to FIG. 13 relativeto
barrel and will also provide the same function for block
35 in FIG. 2 and block 46 in FIG. 7.
When the fastener is driven either to the normal pen
etration position of FIG. 7 or is driven beyond this point
until the abutments formed by members 32a and 46a
ple, FIG. 12, showing normal penetration depth, with
engage, the drivable unit Sii in FIGS. 4-9 can be re
FIG. 13.
moved from the bore ¿Se of the tool while the fastener
remains embedded in the workpiece.
In FIGS. 4_9, both the fastener 31 and the fastener
carrier piston or captive ram 32 are easily disengaged as
a unit from the tool after tiring. The tool is removed
axially from the driven unit after block 46 is rotated to
its associated barrel wherever there is danger that the
`fastener will escape into free flight, such as when the
tool operator attempts to fire it into material having in
sufficient resistance to penetration. Compare, for exam
This construction provides greater safety in tool op
eration as well as more satisfactory setting of the fas
teners. It prevents the free escape of a fastener. The
tool operator cannot dangerously fire the fastener into
free fiight, as a dangerous projectile, by firing the tool
into the air instead of against the workpiece. If the
the inactive position in FIGS. 4 and 5. Then, the piston 30 workpiece does not have sufficient resistance to penetra
32 in FIGS. 4-9 may be unscrewed for reuse and the
tion, there exists neither the danger that the fastener will
fastener §35. remains driven in workpiece I1.
emerge from the other side of the workpiece as a projectile
Gas ports ¿iSd are also preferably provided in FIG. 4
in the tool barrei to permit gas escape from behind piston
32 before unit 3@ reaches the FIG. 7 position so as to
provide the advantages mentioned for ports 15d.
It will also be apparent as the description proceeds, that
the tool in FIGS. 1-9 will work in basically the same
in free Hight nor the danger that the fastener will be over
driven beyond the depth control established by the err
gagement of the abutment shoulder 52a on the drivable
unit and Crossbar 56 on the tool at the barrel muzzle.
Substantial inclination of the barrel bore from the normal
to the workpiece surface will not cause a ricochet since
the tool preferably has said angle tire control and, in any
having the shape of the whole drivable unit so that the 4:0 event7 the fastener cannot escape into free night.
manner if the fastener can be designed with an outline
unit is one integral manner with the ram or piston portion
being integrally a part of the driven fastener so that a
When the fastener is driven either to the normal pene
tration position of FIG. 12 or is driven beyond this point
until the abutments formed by members 52a and 56 en
separate ram or piston is not required.
In the present disclosure, the tool h'i has in FIGS. 10-13
gage, the fastener 51 in FIGS. 10-13 can be removed
a captive drivabie unit 5d including fastener 5I detach 45 from the bore of the tool while the fastener remains em
bedded in the workpiece.
ably connected by screw threads to a fastener carrier,
such as the element S2 here shown, which is designated
In FIG. 13, the fastener 51 is easily disengaged from
herein as a piston, head or ram. The fastener has a for
the tool after firing by spinning off or unscrewing the
wardiy projecting piercing portion 51a for penetrating the
whole tool from the driven fastener 51 so that the tool
workpiece after being driven through the vbarrel while the 50 may be pulled axially therefrom.
Gas ports 55d are also preferably provided in FIG. 10
piston has an abutment means or shoulder 52a (the` ieft
in the tool barrel to permit gas escape from behind piston
end of slot 52h in FIGS. 10-13) to be described in fur
ther detail hereinafter. The ram or piston is shown as be
52 before unit 50 reaches the FIG. 12 position so as to
ing internally threaded to accept the fasteners, but in the
provide the advantages mentioned for ports 15d.
The tool in FIG. 14 will be next described. Captive
event any fastener has an internally threaded head, its 55
drivable unit Sii therein has the same structure and mode
ram or piston may be externally threaded to engage the
of operation as unit 56 in FIGS. 10-13. The unit and
fastener.
cartridge 17 may ybe loaded into the tool and the unit
The safety features of the present invention yare not
may be pushed rearwardly in the barrel and held in the
required under normal conditions when there is no danger
of having the fastener escape into free fright. During 60 barrel bore close to cartridge 17 in any suitable manner,
such as mentioned for the FIGS. 10-13 tool form. An
loading of the tool in FIGS. 10-13, the fastener 51 is
abutment 4means on the tool coacts with the abutment
screwed into the ram or piston in approximately the FIG.
12 position, and then drivable unit 50 is pushed rearwardly
means 52a on the piston or ram as the unit attempts to
travel substantially beyond the FIG. 12 position in the
through the barrel 55 to about the FIG. 10 position in
same manner as when unit 50 attempts to travel substan
the barrel bore 55e until it is close to the seated position 65 tially
beyond the FIG. 12 position.
of cartridge 1’7 and is held in this position in any suitable
In FIG. 14, the abutment means and its operative con~
manner, as mentioned for the FIGS. 1-3 tool form.
Then, an explosive charge, such as cartridge I7 in FIGS.
nection to the too-l takes a form similar to that in FIGS.
10-13. Crossbar 56 extends transversely through slots
10-13, is also inserted into the breech after which the 70 or elongated apertures 55a’ in the modified form of barrel
breech of the tool is closed so that the tool can be moved
55’ and an elongated aperture or slot 521i in piston 52,
to firing position against the workpiece Il, as shown by
elongated in the direction of the barrel axis to form a lost
the tool in FIG. 14. After trigger 16 is pulled, the fasten
motion connection between piston 52 and its associated
er is driven by the tool into the workpiece to its normal
barrel SS’. A helical compression spring 53 and ring 52’
and desired penetration shown in FIG. l2 wherein the 75 are telescoped over the barrel to -be located between and
3,019,440
9
to operatively connect cro'ssbar 56 and its associated barrel
by an inwardly extending flange 57a on a cap 57 screwed
onto sleeve 54a' in FIG. 14. Sleeve 54a’ surrounds barrel
10
for operatively engaging said ñrst mentioned abutment
means to stop the travel of said unit along said passage
way with the piercing portion adapted to travel a prede
termined distance beyond the discharge end for work
piece penetration, said second mentioned abutment means
55’ and is generally fixed against axial movement relative
to the barrel in the firing position shown in FIG. 14 by
including a crossbar extending transversely through aper
having both the barrel muzzle and cap 57 pressed against
tures in said member and said head with at least one of
workpiece 11, but in any event even when not so pressed,
said apertures being a slot elongated in the length direc
the sleeve 54a’ as in the other embodiments is operatively
tion of the passageway to form a lost motion connection
connected to the barrel through other tool parts shown in
between said captive head and said member, and a helical
FIG. 1 and the aforenoted patent.
compression spring telescoped over said member and op
Spring S3 in FIG. 14 also absorbs the energy of the
eratively engaging said crossbar and an integral out
explosive charge during stopping in the same manner as
wardly extending flange on said member for absorbing
spring 53 in FiG. 13.
the energy of the driveable unit during stopping of said
FIG. 14 also includes resilient means for absorbing the
rebound energy of crossbar 55 and spring 53 after the 15 head by movement of said crossbar relative to said mem
ber.
drivable unit has reached a position comparable to FIG.
2. An explosive actuated tool for driving a fastener
13. If the tool is fired into the air or into easily pene
having a workpiece penetrating part, comprising a barrel
trated material, compressed spring 53 in FIG. 13 may
member having a passageway formed therein and de
cause, upon release of its energy, the cross bar 56 to
strike the rear end of slots 55a’ with considerable force. 20 tining a discharge end for said member, piston means
movably mounted in said passageway, said fastener being
Helical spring 58 is located between and operatively con
insertable into said passageway at a unit projection ex
nects crossbar Sn and flange 55h’ integral with barrel 55’
tendable substantially ahead of the barrel member for
to absorb this rebound energy.
workpiece abutment and said piston means being de
When the fastener is driven either to the normal pene«
tachably connectable to said fastener with the workpiece
tration positio-n or is driven beyond this point until the
penetrating part forwardly of the former and projecting
abutments, formed by members 52a and 56 engage, the
fastener 51 in FIG. 14 can be removed from the bore of
the tool while the fastener remains embedded in the
workpiece by spinning or unscrewing the whole tool from
toward said discharge end, means for discharging an ex
plosive into said passageway effective to drive said piston
means and fastener toward said discharge end and force
the driven fastener 51 so that the tool may be pulled 30 the workpiece penetrating part a normal predetermined
distance forwardly of said discharge end, cross bar and
axially therefrom.
Gas portsSâd' are also preferably provided in FIG. 14
in the tool barrel to permit gas escape from the barrel bore
55e’ behind piston 52 before unit 5G reaches the FIG. 12
position so as to provide the advantages mentioned for
ports 15d.
-
In all figures of the drawing, the fasteners are shown
as being screwed into the piston or captive ram to the
full thread depth. However, it is possible to manually
slot means defining said distance and `a lost motion con
nection between said piston means and said barrel mem
ber, retainer means operatively connected to said barrel
means for providing a rearwardly directed constraint to
said piston means through said connection, said lost
motion connection being normally inactive during driving
of said fastener to said predetermined distance and ac
tuatable in response to a movement of said fastener a dis
adjust the position wherein the safety feature on each of 40 tance greater than said predetermined distance to take
up the lost motion and transmit said force to said piston
the tools takes effect. The tool operator can preset this
means to effect a retardation of its movement toward said
distance by adjusting the screw thread engagement be
discharge end.
tween the piston and fastener when the tool is loaded.
3. An explosive actuated tool as defined in claim 2
Any of these constructions provides greater safety in
tool operation as well as more satisfactory setting of the 45 and including resilient means to provide said rearwardly
directed constraint with a variable force in said lost
fasteners. It prevents the free escape of a fastener. The
motion connection, said force increasing as said drive ex
tool operator cannot dangerously fire the fastener into
tends beyond the predetermined distance.
free flight, as a dangerous projectile, by firing the tool
4. An explosive actuated tool for driving a fastener
into the air instead of against the workpiece. If the work
piece does not have sufficient resistance to penetration, 50 having a workpiece penetrating part comprising a barrel
member having a passageway formed therein and defin
there exists neither the danger that the fastener will
ing a discharge end for said member, a driveable unit
emerge from the other side of the workpiece as a projec
movably mounted in said passageway at a unit projection
tile in free flight nor the danger that the fastener will be
extendable substantially ahead of the barrel member for
overdriven beyond the depth control established by the
engagement of the abutments on the drivable unit and on 55 workpiece abutment and including means for detachable
connection to said fastener and a head part having abut
the tool at the barrel muzzle. Substantial inclination of
the barrel bore `from the normal to the workpiece sur
face will not cause a ricochet since the tool preferably
ment means thereon a space rearwardly of said connec
tion, said fastener being insertable into said passageway
and connectable to said driveable unit with the workpiece
has said angle fire control and, in any event, the fastener
cannot escape into free ñight.
60 penetrating part forwardly of the latter and projecting
Various changes in details and arrangement of parts
toward said discharge end, means for firing an explosive
can be made by one skilled in the art without departing
cartridge into said passageway effective to drive said
driveable unit and said fastener toward said discharge end
from either the spirit of this invention or the scope of
and force the workpiece penetrating part a normal pre
the appended claims.
determined distance foiwardly of said discharge end,
What is claimed is:
1. In combination, a power actuated tool and a drive
able unit adapted to be driven thereby, said tool includ
means defining with said space said distance and a lost
motion connection between said barrel member and drive
able unit comprising a bar element extending through
slots transversely across said unit and into said barrel
ward the discharge end thereof, said driveable unit in 70 member, energy absorbing means included in said lost
motion connection and variably connecting said bar ele
cluding a captive head having an abutment means there
ment to said barrel member with increasing force beyond
on, said head adapted to carry along said passageway
said distance, said lost motion connection being normally
a forwardly projecting piercing portion of a fastener for
inactive while driving said penetrating part of the fastener
penetrating a workpiece when driven by said tool, an
abutment means operatively connected to said member 75 to said predetermined distance and actuatable in response
ing a member providing a passageway so that said power
can drive a driveable unit through said passageway to
3,019,440
1.1
to an excess movement of said fastener a distance beyond
said predetermined distance as to bring said abutment
means on said driveable unit into engagement with said
bar element, said engagement being eifective to transmit
the driving force developed by said cartridge to said energy
absorbing means and cause a retardation of the driveable
12
subjecting said retainer means to excessive impact stress
and thereby avoiding fracture of said means and escape
of said unit.
8. The tool of claim 7 wherein the connection includes
an elastically deformable shock absorbing member in
cluding a helical spring telescoped over said barrel mem
ber and operatively connecting said barrel member and
unit during said excess movement toward said discharge
end of the barrel member.
retainer means.
5. The tool of claim 4 wherein the means for detach
9. An explosive actuated tool for driving a fastener
able connection between the fastener and the driveable 10 having a workpiece penetrating part comprising a barrel
unit head part is adjustable to axially vary the position
member having a passageway formed therein and deñning
of the fastener relative to said part whereby taking effect
a discharge end for said member, a driveable unit mova
of the lost motion connection is varied.
bly mounted in said passageway at a unit projection ex
6. An explosive actuated tool as defined in claim 4 and
tendable substantially ahead of the barrel member for
wherein a sleeve is operatively attached to the barrel 15 workpiece abutment and including means for detachable
member rearwardly of its discharge end and is formed
connection to said fastener and a head part having abut
adjacent said end with detachable inward projection means
ment means thereon a space rearwardly of said connec
abuttable with said workpiece and connecting with a heli
tion, said fastener being insertable into said passageway
cal compression spring comprising the absorbing means to
and detachably connectable to said driveable unit with
complete the connection between the driveable unit and
the workpiece penetrating part forwardly of the latter and
said `barrel member, and including a rebound resilient
projecting toward said discharge end, means for firing
element mounted between said barrel member and the
an explosive cartridge into said pasageway effective to
bar element and forming a second energy absorbing con
drive said driveable unit and said fastener toward said
nection between said member and element.
discharge end and force the workpiece penetrating part
7. An explosive actuated fastener driving tool of the 25 a normal predetermined distance forwardly of said dis
hammer type including a barrel member providing a bore
charge end, means defining with said space said distance
from the ybreech~ to the muzzle of said member, a drive
and a lost motion connection between said barrel mem
able unit including a piston head mounted in said bore
ber and driveable unit comprising a bar element extend~
with an abutment and with a nose projection a space for
ing transversely across said unit and into said barrel
wardly of said abutment adapted with its abutment to be 30 member, a helical spring disposed over the barrel mem
driven through said bore in a working stroke extending
ber constituting a variable operative connection between
a predetermined distance from a retracted position ad
said barrel member and the bar element, said connection
jacent said breech to a normal forward position adjacent
being effective to provide to said bar element a variable
said muzzle, said `projection being extendable substan~
bias directed rearwardly along said barrel member, said
tially ahead of the barrel member for workpiece abut 35 lost motion connection being normally inactive while driv
ment before said head abutment engages, ,retainer means
ing said penetrating part of the fastener to said prede
for preventing escape of said unit from said bore, said
termined distance and actuatable in response to movement
means having a part being movably mounted on said
of said fastener a distance beyond said predetermined dis~
member adjacent said muzzle with limited axial rela
tance as to bring said abutment means on said drivable
tive movement between said part and said barrel mem 40 unit into engagement with sai-d bar element, said bias be
ber, at least said retainer means part being separate from
ing effective in response to the actuation of said lost
said barrel member and including on said part a piston
motion connection to resist the driving force developed by
stopping abutment normally spaced from said piston head
said explosive cartridge.
abutment at said normal >forward position, said means
10. The tool of claim 9 wherein the spring is a com
having an end portion abutable with the workpiece into 45 pression member, and including a rebound compression
which said fastener is to be driven, said retainer means
spring mounted between said barrel member and the bar
including a lost motion connection yieldably connecting
element and forming a second energy absorbing connec~
said barrel member and at least the latter of said driva
tion between said member and element.
ble unit and retainer means, said piston head abutment
50
operatively mating with and engaging said stopping abut
References @ited in the tile of this patent
ment to block the travel of said unit beyond said pre
UNITED STATES PATENTS
determined distance, said connection including said space
1,106,646
Gardner _____________ __ Aug. 11, 1914
and distance, and said unit being adapted to said for
ward position to forwardly project suñiciently from said
bore a forwardly extending piercing portion of said fas 55
tener for impalement into said workpiece abutting said
end, whereby in event of overdrive beyond said working
stroke engagement between said stopping and mating
abutments occurs and the energy of shock is lost in said
relative movement between said barrel member and re 60
tainer means at least in part at said connection without
2,724,116
Termet ______________ __ Nov. 22, 1955
kFORElÈGN PATENTS
62,135
127,097
178,075
537,676
France ______________ __ Dec. 29,
Great Britain _________ __ May 21,
Austria ______________ __ Apr. l0,
France _______________ __ Mar. 8,
1954
1919
1954
1922
618,546
Great Britain _________ __ Feb. 23, 1949
Документ
Категория
Без категории
Просмотров
0
Размер файла
1 396 Кб
Теги
1/--страниц
Пожаловаться на содержимое документа