CN1429691A

CN1429691A - Fastener driving tool with compression power producer

Info

Publication number: CN1429691A
Application number: CN 03100211
Authority: CN
Inventors: 马克·拉吉
Original assignee: Illinois Tool Works Inc
Current assignee: Illinois Tool Works Inc
Priority date: 2002-01-04
Filing date: 2003-01-03
Publication date: 2003-07-16
Anticipated expiration: 2023-01-03
Also published as: CN100445043C

Abstract

A fastener driving tool is disclosed having a self contained pre-pressurized pneumatic power source. Operator actuation of a trigger mechanism causes a pressurized medium supplied by the self contained pre-pressurized power source to flow through a valve and to propel a piston connected to a driver blade towards a nosepiece assembly end of the tool. The flow of the pressurized medium through the valve further recoils a spring-biased activating bolt which resets the trigger mechanism.

Description

The fastener-driving tools in band compression power source

Technical field

The present invention relates generally to fastener-driving tools, more specifically say, relate to a kind of this class instrument that has the precommpression power source.

Background technology

The power tool that is used for driving fasteners into workpiece is well-known in the art.This instrument can be used various energy resources, comprise pneumatic, the burning, the electric power or the mechanically operated energy are for power comes work.In some power tool, the support of power source and instrument forms integral body, to be convenient for carrying.Other is used then to be needed to obtain power by the line of feeding from extra power, for example the pneumatic tool that is driven by air compressor.

Such fastener-driving tools, particularly pneumatic tool comprise a rifle shape metal chassis and a storage bin part that is attached on casing and/or the handgrip.In general, storage bin keeps securing member is supplied to the drive track that is used for accepting securing member in the casing, and after securing member was transmitted out drive track, the guiding securing member entered in the workpiece.

Casing also comprises a piston in the fastener-driving tools main chamber, and it is for along the chamber that is driven by compressed air, combustion product, and is perhaps, reciprocating and be provided with from the retracted position that drives stroke to extended position.The driving stroke of piston promotes the drive plate of bump securing member in the drive track and drives fasteners in the workpiece.The structure of piston also makes it can be subjected to the reverse drive of backspring, partial vacuum or other known devices and turn back to retracted position in backhaul.

In use there are some shortcomings in existing fastener drive power tool.A shortcoming is that these instruments are designed to have a large amount of parts, and arbitrary parts all can be because of wearing and tearing or the breakage misoperation in normal the use.The expense of assembling in addition,, making and repairing this instrument also is considerable.Another shortcoming relevant with some existing fastener drive power tool is weight and the heaviness owing to them, may tiresome when using continuously.Have, some this type of instrument also needs the power line of feeding again, and as compressed-air hose, this can seem very inconvenient in use, because except instrument, the operator also must carry the power line of feeding.

Summary of the invention

Disclosed portable pneumatic instrument has one can be supplied to the tool tip mouth of pipe with the securing member order so that be driven into storage bin in the workpiece.Instrument has a casing, and it has one to be that part is arranged in the reciprocating motion drive plate in the casing at least.The precommpression drive power source that this drive plate is carried, this power source preferably are placed in the container that removably is attached to casing.

In another embodiment, a kind of starter mechanism that discloses is for band precommpression power source and to be used for storing the fastener-driving tools of storage bin of securing member used, here, storage bin pushes the top mouth of pipe with the securing member order, and drive plate then drives in the workpiece by mouth of pipe bump securing member and with it.Starter mechanism has a valve opening spare, a valve and a plate machine.This valve can open and close because of the reciprocating motion of valve opening spare, and control is from the compressed media flow of precommpression power source.The plate machine maintains a desired location until being started with valve opening spare, and the starting of plate machine then causes the transverse movement of valve opening spare, makes valve open and allows compressed media stream to pass through valve.Compressed media flow by valve during flow is limited to a fixed qty, and the latter causes the bounce-back of valve opening spare to get back to its desired location, and starter mechanism is resetted.

Description of drawings

Fig. 1 is the vertical cross section of one type the fastener-driving tools that can use with the present invention, and for clarity sake, some part is that part illustrates;

Fig. 2 is the vertical section of instrument shown in Figure 1, and starter mechanism wherein is in starting state;

Fig. 3 is the vertical section of instrument shown in Figure 1, and piston wherein is in and drives in the stroke; With

Fig. 4 is the vertical section of instrument shown in Figure 1, and piston wherein is in the backstroke.

The specific embodiment

As shown in Fig. 1 to Fig. 4, portable pneumatic powered fastener-driving tool 10 constitutes a kind of expection embodiment of the present invention.More particularly, fastener-driving tools 10 comprises casing 12, and it has a handgrip 14 and is installed on the casing and comprises the top mouth of pipe assembly 16 of a securing member feeding source or storage bin 18.Top mouth of pipe assembly 16 is configured to can accept to be fed to by securing member feeding source 18 orders many of arranging in regular turn in the securing member 20 of mouth of pipe assembly.Securing member 20 is subjected to the effect of bias force and is pushed to mouth of pipe assembly 16, and is clashed into by reciprocating drive plate at mouth of pipe assembly 16 places and be driven in the workpiece (not shown) of wooden or other materials.

Pneumatic power fastener-driving tools 10 can be by including, but not limited to nitrogen oxide (N ₂O) or carbon dioxide (CO ₂) work at the interior various precommpression power source media 22 of providing for oneself.The two-phase mixed state precommpression CO that a kind of preferred embodiment utilization that will illustrate is below provided for oneself ₂As power source 22.Utilize CO ₂An advantage of biphasic mixture be to be in poised state and CO is arranged when mixture is stored in the detachable container 24 ₂Two-phase when remaining in the container, can keep the constant pressure of gas phase.In other words, as gaseous state CO ₂When from container 24, discharging with driving fastener-driving tools 10, liquid CO ₂Become the gaseous state CO of gas phase with alternate losses ₂And keep constant pressure in the container.Utilization is such as CO ₂Another advantage in compression power source 22 be that because the elevated pressures (800psi: within the scope) of gas, the quantity of instrument movable member and size all can reduce.This can reduce contingent mechanical breakdown probability again, simplifies repair work, and reduces the overall cost of making.

Compression CO ₂Power source 22 is contained in suitable parts, such as intermediate plate 25, in the container 24 of removable attachment on storage bin 18, uses dismountable CO ₂A peculiar advantage of container 24 is that this container is easy to manufacture in different regions the commodity pressure vessel of various different sizes.And as needs, this container 24 also can repeat can easily.In using, pneumatically operated power tool uses CO ₂Another advantage of mixture is CO ₂Some desirable physical property is arranged.

At room temperature, fill with CO ₂Container 24 can bear about 850lbs/in ²Pressure, therefore can be used as pneumatic power source.In addition, in this case, before being discharged by container value 26, liquid and gaseous state CO ₂Coexist as in the container 24.Container value 26 can be the valve of manual unlocking type, the screw-in valve of when container is loaded onto, just opening, or be the air pressure valve of people's any kind in common knowledge in this area.When opening container value 26 and making CO ₂When mixture 22 is exposed to atmospheric pressure, gaseous state CO ₂To overflow, and some liquid CO ₂To in a disguised form be gaseous state.If container value 26 is closed, equilibrium state will recover, and suppose that temperature does not change pressure in the container 24 then and will keep constantly, and this is another kind of perfect performance.

CO ₂The conversion process of mixture can continue with the opening and closing in succession of container 24, and the liquid in container 24 exhausts, and at this moment, has only CO ₂Gas is stayed in the container.Continuation discharges CO from container 24 ₂The result be CO in the container ₂Gas pressure will be reduced to and be lower than CO ₂About 850lbs/in of mixture ²Initial pressure.

In this preferred embodiment, fastener-driving tools 10 is with high pressure CO ₂Gas is power, CO ₂Gas flows out from container 24, the annular seal space 32 that high-pressure hose by a pipe joint 30 is arranged or pipeline 28 are supplied with in the casings 12.Can select to settle a pressure regulator 34 along pipeline 28, be used for controlling CO ₂The pressure of mixture 22, and it is configured to pressure to be reduced to about 400lbs/in ²

In other embodiments, adjuster 34 can make the CO by the there ₂The pressure of mixture 22 is different from 400lbs/in ², but be lower than CO ₂The about 850lbs/in of mixture ²Initial pressure, this knows altogether to those skilled in the art.In addition, if container 24 directly is connected with annular seal space 32, then high-pressure hose 28 can save.Yet, use an advantage of high-pressure hose to be, when using under state upside down, the flexibility of flexible pipe can make things convenient for the use of instrument 10.In other words, container 24 can unload from storage bin 18, and it also is catotropic making instrument 10 use container then not need under catotropic state.Tool using 10 can prevent liquid CO by this way ₂From container 24, flow out, therefore can save power source.

In another embodiment, instrument 10 can be configured to the directly CO to discharge from container 24 ₂ Mixture 22 is worked.This make no longer needs pressure regulator.But this design has limited instrument 10 at CO ₂Mixture 22 becomes the operating efficiency behind the pure gas state, because work as CO ₂When gas was overflowed from container, the pressure in the container 24 can reduce.

Refer again to Fig. 1 to 4, the annular seal space 32 of instrument comprises spring biasing check valve 36, and it is adjusted to normally closed, and this can see the most clearly in Fig. 1.Check valve 36 comprises plate washer 37, is subjected to the reciprocating motion arm spare 38 of spring biasing and is to be biased and to make the valve spring 39 of first mouthful 40 of arm spare 38 sealing under normally off.Be subjected to the drive screw of spring biasing or valve opening spare 42 to be in as shown in fig. 1 desired location at first, and be configured to be discharged back contact arm spare 38 by

starter mechanism

43,43 of starter mechanisms comprise that trigger 44, pivot pin 45, trigger spring 46, back are to arm 47, deduction spring 48 and deduction 50.For driving a securing member 20, user's squeezes trigger 44, the latter then activates starter mechanism 43 and causes CO ₂Flow into first mouthful 40.Instrument 10 preferably also has second mouthful 52 of being between reciprocating arm spare 38 and the starting screw rod 42, and this second mouthful 52 makes first mouthful 40 and one main accent 54 fluid communication.

In this preferred embodiment, starting screw rod 42 is pistons reciprocating, and it is placed in the cylindrical chamber or hole 55 in the instrument of being defined in 10.In one embodiment, screw rod 42 is positioned at spring 57 biasings between screw rod and the casing 12.As shown in fig. 1, screw rod 42 is in desired location and is subjected to the deduction 50 of starter mechanism 43 to limit and can not contact with arm spare 38.Screw rod 42 spurs with the operator at deduction 50 and is released when trigger 44 unclamps.In described structure, the back of trigger 44 meshes to the neighboring terminal 53 of arm 47 with deduction 50.

In case trigger 44 is pulled, act on spring pressure on the screw rod 42 just can be freely forward lead-screw along its hole 55 generally towards check valve 36, specifically towards 38 motions of arm spare.55 the terminal in the hole, the reciprocating arm spare 38 of starting screw rod 42 contacts is opened check valve 36 and is allowed high pressure CO ₂Mixture 22 is overflowed from annular seal space 32, and through

port

40 and 54 and arrive the gas piston 56 be arranged in hole or main chamber 58.In another embodiment, reciprocating arm spare 38 can be embedded in the cylindrical chamber 55 by pressure.

Instrument 10 comprises also and is arranged in the chamber 55 and a piston 59 such as the sealing ring 60 of O shape ring or analog is arranged that sealing ring 60 is around piston, to prevent CO ₂Gas 22 is by this piston.Similarly, 61 of O shape ring or sealing rings of equal value center on gas piston 56, to prevent CO ₂Gas 22 is by gas piston 56 and flow to hole 58.

High pressure CO ₂Gas is given gas piston 56 application of forces, and the driving gas piston is towards mouth of pipe assembly 16.Pulling 62 attached to the driving on the piston 56 plucks next securing member 20 and it is driven in the workpiece from storage bin 18.Meanwhile, high pressure CO ₂The sub-fraction of gas 22 preferably applies work in order to overcoming the spring biases strength that is produced by spring 57 to starting screw rod 42, and to rear drive starting screw rod, starter mechanism 43 is resetted.In other words, the recoil that screw rod 42 leaves check valve 36 has exposed by 48 biasings of deduction spring and screw rod has been positioned at deduction 50 on its desired location, and at this moment, piston 56 and driving are pulled 62 and securing member 20 driven in the workpiece.

Sleeve 63 is around gas piston 56 and drive plate 62, and is configured to be used for alignment piston 56 in hole 58.The air 65 that the sealing gasket 64 that is attached to sleeve 63 at two ends is used for preventing to be enclosed in the hole 58 is sewed to surrounding environment.Sleeve 63 also comprises mouth 66, works as high pressure CO ₂When gas 22 promoted piston 56 towards mouth of pipe assembly 16, mouthful 66 permission air 65 were expelled to back cavity 67.Discharge air 65 in the back cavity 67 is bearing pressure, and make piston 56 towards the hole 58 first terminal 68 return.

Piston 56 and drive plate 62 be configured to each starting of trigger 44 clash into securing member 20 and with its sequentially feeding to mouth of pipe assembly 16.For preventing the motion of mouth of pipe assembly 16 during moving back and forth at piston 56, mouth of pipe assembly is fixed on the casing structure 12 with mouth of pipe assembly screw 69.Preferably, the diameter of piston 56 is less than the diameter of the piston that uses with pressure regulator 34.Yet another advantage of working pressure adjuster 34 is that it is minimum that the effect than low ambient temperature that causes container pressure to reduce during the tool work can reduce to, and provide more consistent power output for instrument 10 in wider temperature range.In addition, under the high ambient temperature condition, the container 24 of instrument 10 also can be equipped with a pressure-reducing valve (not shown), and it can be guided the air-flow of all emergent gas 22 into container and be used for cooling, and this has further widened temperature range.

Referring now to Fig. 1,, piston shown in the figure 56 is retracted into main accent 54 places fully, is in the preceding or desired location of igniting at first terminal, 68 places in hole 58.When check valve 36 is opened,

mouth

40,52 and 54 will guide compressed media 22 streams by check valve 36, make piston 56 be pushed to the ignition location or second terminal 70 in hole 58.Ring baffle 71 has prevented the continuation campaign of piston 56 towards mouth of pipe assembly 16.Casing 12 comprises that also allows a CO when starter mechanism starts ₂Escape into the casing mouth 72 in the surrounding environment.

During work, the not fired state when instrument 10 is in trigger 44 unstart still at first, as shown in fig. 1.Check valve 36 is closed, and deduction 50 has then prevented the motion of starting screw rod 42 towards check valve.CO ₂Mixture 22 is stored in container 24 and the annular seal space 32.In addition, piston 56 is positioned at first terminal, 68 places in hole 58, makes drive plate 62 and securing member 20 bumps displacement maximum before.

Referring now to Fig. 2,, during actuation of trigger 44, deduction 50 rotates and discharges screw rod 42, and the latter then opens valve 36.The CO of compression ₂73 direction flows into first mouthful 40 and enters main accent 54 then gas 22 from annular seal space 32 along arrow.CO ₂Gas 22 enters 54 directions along arrow 74 of main accent and pushes piston 56 to mouth of pipe assembly 16.CO ₂Gas 22 also flows through second mouthful 52 and discharges casing 12 by casing mouth 72 along the direction of arrow 76.

Fig. 3 has provided the position of gas piston 56 before just will arriving baffle plate 71.CO ₂Gas 22 present flow directions are represented CO with arrow 78 ₂Bump starting screw rod 42 causes screw rod 42 along the desired location recoil towards it of the direction of arrow 80.The mobile positive air pressure that causes piston 56 following air pocket 82 places of piston 56.Backward between moving period, the

mouth

52,54 and 72 in piston 56 upstreams all is open to atmospheric environment at starting screw rod 42, at this moment, and the CO in the hole 58 ₂ Gas 22 is overflowed from mouth 72.After this very fast, the air pressure at air pocket 82 places is above the pressure in the

mouth

52 and 54 of piston 56 upstreams, so piston 56 is back on its desired location of first terminal, 68 places.

Referring now to Fig. 4,, provided the backward stroke of piston 56 among the figure.Starting screw rod 42 turns back to its desired location, closes check valve 36, and prevents CO ₂Slave faucal 72 is overflowed.Piston 56 along the direction of arrow 84 towards the hole 58 first terminal 68 return.When piston 56 arrives first terminal 68, instrument 10 will be set to prefiring pattern again, and can be used for driving another securing member 20 by means of actuation of trigger 44.

Though disclosed a kind of specific embodiments of fastener-driving tools of the present invention, those skilled in the art understands, under the situation that does not depart from the more multi-direction and following claim of the present invention, can make various changes and improvement.

Claims

1, a kind of have the securing member that will arrange in regular turn in the securing member source of feeding and be supplied to instrument mouth of pipe assembly terminal so that be driven into portable pneumatic power tool in the workpiece, comprising:

Casing;

Provide precommpression power supply source for oneself; With

At least be that part is positioned at casing and by the reciprocating motion drive plate of providing precommpression power supply source driving for oneself.

2, comprise also that according to the instrument of claim 1 formation can will provide the starter mechanism that precommpression power supply source is fed to drive plate for oneself.

3, also comprise an annular seal space and a valve that is used for controlling from the flow of providing precommpression power supply source for oneself of described annular seal space in the casing according to the instrument of claim 1.

4, according to the instrument of claim 2, wherein, described starter mechanism also comprises a trigger, a starting screw rod that is used for opening valve when described trigger moves.

5, the instrument according to claim 4 comprises that also one is configured to be used for mesh to prevent to start the deduction of screw motion with trigger.

6, according to the instrument of claim 3, wherein, described valve is a check valve of providing precommpression power supply source for oneself that is configured to be used for letting pass from described annular seal space to drive plate.

7, according to the instrument of claim 1, wherein, described casing structure comprises that also an inner chamber and one are with described cavity fluid UNICOM and be configured to can allow to provide for oneself precommpression power supply source escapes into environment space from casing casing mouth.

8, the instrument according to claim 3 comprises that also one can be connected with described annular seal space and be configured to be used for and will provide the pressure vessel that precommpression power supply source is fed to described casing for oneself.

9, instrument according to Claim 8, wherein, pressure vessel can unload from described casing.

10, instrument according to Claim 8 comprises that also one is configured to be used for and will provides the flexible hose that precommpression power supply source is fed to annular seal space for oneself.

11, a kind of for having the starter mechanism of the fastener-driving tools use of providing precommpression power source and storage bin for oneself, wherein, storage bin be used for storing securing member and the order with it towards mouth of pipe components drive, drive plate travels by this mouth of pipe assembly, the bump securing member also drives in it in workpiece, and this starter mechanism comprises:

A valve opening spare;

A trigger, it is configured to and can before the trigger action described valve opening spare is remained on the desired location; With

Reciprocating motion that can be subjected to described valve opening spare and the valve of opening and closing, wherein, described valve is being controlled the flow from the compressed media of providing the precommpression power source for oneself.

12, comprise also that according to the starter mechanism of claim 11 one can be meshed by described trigger and valve opening spare is locked in deduction on the desired location.

13, according to the starter mechanism of claim 11, wherein, valve opening spare is subjected to the spring biasing.

14, according to the starter mechanism of claim 11, wherein, described valve comprises an arm spare that is subjected to the spring biasing.

15, the starter mechanism according to claim 12 also comprises a deduction spring, and it is used for setovering described deduction with engagement valve opening spare.

16, according to the starter mechanism of claim 11, wherein, described valve opening spare comprises:

Pistons reciprocating in a hole; With

Around described piston, and be used for preventing that compressed media from flowing through the O V-shaped ring of described piston.

17, a kind of method that embeds securing member comprises:

The piston actuated plate is placed on the setting position in the casing with the mouth of pipe assembly that is configured to be used for to accept drive plate;

With one or more securing members marshalling in order;

One or more securing members are delivered to mouth of pipe assembly place one by one;

Clash into the securing member that each is delivered to respectively with the piston actuated plate, wherein, the piston actuated plate is that the portable precommpression power source of providing for oneself that is subjected to find on instrument promotes; With

Make the piston actuated plate get back to desired location.

18, also comprise from the container that gaseous state and liquid carbon dioxide mixture are housed according to the method for claim 17 and present the step of providing the precommpression power source for oneself.

19, the method according to claim 18 also comprises the step of regulating the pressure of providing the precommpression power source for oneself that is fed.

20, also be included in the piston actuated plate according to the method for claim 17 and a described part of providing the precommpression power source for oneself be discharged into the step of going in the surrounding environment when getting back to the original place.