DE1603718A1 - Compressed air fastener driving device - Google Patents

Description

Godfather:

DJPL-ING. CURT WALLACH DIPL-ING, GÜNTHER KOCH 160371 8 OR. TINO H Al BACH

22 Sep 1966

8 MUNICH 2, OEN

OUR

CHARACTER: lO 483

Bostitch Incorporated
Rhode Island / USA

Pneumatic fastener driving tool

The invention relates to a compressed air driving device and, more particularly, to a high performance device especially for driving fasteners into a workpiece. ^

Compressed air driven driving tools are increasingly being used Use as labor-saving devices that make work easier. These tools are special are advantageous as portable devices and as such can be used in many cases in which they are frequently very exposed to adverse conditions, such as extreme temperatures and / or a polluted atmosphere, sub In such circumstances it is important that the tools

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Work casually and not take great care in handling or require major maintenance.

An object of the invention is to provide new and improved ones Compressed air drive motors with which larger fasteners, such as large nails, are driven can.

Another object of the invention is to provide a novel one and an improved compressed air drive motor in which a simplified valve arrangement is provided.

Another object of the invention is to provide a high output propulsive engine for driving in a larger fastener with a single stroke in an arrangement, the economic utilization of the pressure medium used « provides.

Another object of the invention is to provide a reliable, portable, compressed air driving tool with as few moving parts as possible.

According to the invention, a compressed air drive motor is provided, which has a cylinder with an open end, a pressure medium container and a piston in the cylinder for

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Axial movement is arranged away from the open end during the driving stroke. The relationship of the piston and cylinder is such that the piston can protrude from the open end of the cylinder. Above the open end of the cylinder is a piston stop assembly in the form of a pendulum member, which has a first annular surface which rests against the end of the piston and forms a first seal between the upper part of the piston and the container, and a second annular surface. Has surface which surrounds the first annular surface and can come to rest at the end of the cylinder to form a second seal, namely for the main opening between the cylinder and the container provided and the movable pendulum member has a sealing part which can close the outlet channel in a first pendulum member position in which the second annular surface is at a distance from the end of the cylinder so that the opening between the container and the cylinder is open. Furthermore, a control element is provided for the supply of pressure medium to the top of the piston, if. The pendulum is in the first position to move the piston away from the pendulum (breaking the seal on the first annular surface), thereby never subjecting the top of the piston to pressure from the container through the main port to swiftly move the piston with it a powerful

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drive term Eintreibhub. The pendulum element can be moved into a second position in which the outlet channel is open is and the master cylinder opening through the attachment of the second closed annular surface at the open end of the cylinder so that the piston can return to the piston stop.

In the preferred embodiment, that will be the top The pressure medium supplied to the piston is passed through a control chamber, which is normally under low pressure (to the atmosphere open). The pressure supplied to the control chamber holds that Peridelorgan in the first position to ensure that the outlet opening is closed and that it is at the top The pressure, which continues to build up the piston, moves it away from the penile organ, creating the first annular seal is canceled, so that the piston of the full force of the pressure

, .ttels is suspended from the container. The control chamber remains under pressure until the device, for example after moving the piston or after loosening a through the Tool-operated lock or after the release of the manually operated trigger must be reset. After the pressure in the control chamber has been released, the pendulum element can move from the first position to the second position move, whereby the opening between the master cylinder and the container is closed and the outlet opening is opened. When the top of the piston through the open exhaust port

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is exposed to the outside air, the piston can be moved back into its normal or starting position, preferably by the pressure medium. During its return movement, the piston first comes to rest on the pendulum element, whereby an e ± E seal is achieved on the first ring surface. After this seal is established, the piston acts against the pendulum member, to move it from the second position, whereby the outlet port is closed and the opening between the master cylinder and the reservoir, but without Leäcen to the outlet port due to the production of the seal between the piston and the pendulum organ.

This structural arrangement results in a reliable, high-performance, portable, compressed air drive motor suitable for use with an apparatus for driving fasteners from a magazine to a workpiece.These fasteners can be larger fasteners, such as large nails, and the apparatus drives such fasteners with a single stroke a »The device has only two moving parts (apart from the simple control valve), namely the pendulum element and the piston. The pendulum element carries several seals which cooperate with the housing (outlet opening) and the cylinder and the piston

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as a portable tool in a variety of environmental conditions suitable.

Further objects, features and advantages of the invention will become apparent from the description of a particular one which follows Embodiment in connection with the accompanying drawings, namely show:

Pig. Figure 1 is a side view, with parts broken away, of a propulsion motor according to the invention for use in the case of a fastener driving device j

FIG. 2 is a sectional view similar to Pig, I showing the Shows propulsion motor in fully actuated position;

Fig · 3 a sectional view of parts of the Eintreibmotors what "the position 4p divided tei t * when the piston aurückkehrt;

FIG. 4 shows a schematic representation of the modified embodiment of the drive motor sj

PIg ₉ 5 is a plan view of the pendulum member used in the engine shown in FIG. 4 and FIG

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FIg. 6 and 7 are sectional views of the engine shown in Fig. 4, which show two different work stages,

The device shown in Fig. 1 has a housing lo, on to which a magazine 12 is attached by suitable conventional means for receiving a supply of to be entered Fasteners is suitable and on. its front end has a mouthpiece 14 which has a driving path Ϊ6, into which the fastener from the magazine 12 is inserted for driving by the motor arranged in the housing Io.

The housing has a handle part 2o which forms a container chamber 22 which is connected to a supply line Zk. At the front end of the handle part 2o is a body part 26 which forms a further container chamber 28 in which a cylindrical sleeve 3o is located. This cylindrical sleeve is fastened at its lower end in the housing and is formed with a buffer 32 at this point. The cylindrical sleeve is formed by a lower cylindrical section 34 of a first diameter and by an upper cylindrical section 36 of a second and D-larger diameter than the lower section 34. Immediately above the transition between the sections

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34 and 36 there is a number of openings 38 which are in communication with the container 28 chamber.

A piston 4o is located in the cylindrical sleeve 3o. This piston has a lower piston part 42, the slides within the lower cylindrical portion 34, and an upper piston portion 44, which is within the upper cylindrical portion 36 slides. Each of these piston parts is provided with a sealing ring or other suitable one Sealing element 46 is provided which is attached to the cooperating parts of the inner wall of the cylindrical sleeve 30 is present. The upper piston portion 44 has a head portion 48 extending above its main body portion and a forms flat annular top 5o.

The upper end of the housing 26 is open and has a larger diameter than that of the cylindrical sleeve 34.

An annular flange 52 protrudes inward at a point above the open upper end of the sleeve 3o. A cap 54, which has an outlet opening 56, is attached to the upper end of the housing. In the center of the cap 54 there is a downward- facing Ansat ζ 58. A horizontal surface extends from the downward-facing projection 58

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to the outside, in which outlet openings 62 are provided, which are in communication with the outlet opening 56 via channels 64 stand. The cap and its downward projection 58 cooperate with the splash 52 in the upper end of the housing 26 and form a chamber 66.

A pendulum element 7o, which serves as a combined piston stop and valve arrangement, is arranged within the chamber. This pendulum element has an elastic element 72 on its underside, which acts as a duct element. Immediately above this surface on its inside there is a lip part or lip 74 and from this lip a cylindrical web 76 extends upwards, which has a number of continuous channels 78. Above the vertical web is a horizontal outwardly extending web 8o, on the upper side of which a sealing element 82 is fastened, which cooperates with the outlet openings 62. Finally , on the outer circumference of the horizontal web 8o, there is a vertical flange part 84. This vertical flange ends with a horizontal annular end surface 86 which is connected to an opening 88 which is exposed to the pressure in the container chamber 28 via a channel 9o. A seal 92 carried by the housing rests against the outside of the vertical flange 84, while a corresponding seal 94 carried by the cap 54 rests against the outside of the vertical flange 84

Seals the inside width of the vertical flange. A seal

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-loan the inwardly protruding flange 52 of the housing rests against the vertical web 76 of the pendulum member and seals against it this. Between the cap and the pendulum there is a spring loo, which exerts a slight loading force in the downward direction exerts on the pendulum organ 7o.

The control chamber 66 is connected by means of a channel Io2 to a chamber in which there is a valve sleeve 1ο * ί which has an outlet opening Io6 and a supply opening Io8. A teatllelement Ho is arranged in the valve sleeve Io4 for movement between a first position in which the supply opening Io8 is closed when the outlet opening Io6 is open (as shown in FIG. 1) and a second position in which the supply opening is open and the outlet opening is closed (as shown in Fig. 2.) This valve element Ho is connected to a trigger 114 by means of a valve stem 112. The container air pressure normally loads the valve into the position shown in Fig Feed opening loÖ is closed.

The position of the parts of the drive motor when fed to this Dnek is shown in FIG. In this state, the piston 4o is in the upper part of the cylindrical sleeve 3o (normal or starting position). This is due to the fact that the pressure from the container chambers via the openings 38

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on the underside of the piston part 44, which is larger than the upper side of the piston part 42, acts. Therefore, the piston is loaded upwards and out of the cylindrical sleeve 3o against the underside of the pendulum member 7o and its sealing element 72 in order to produce an annular seal between the surface 5o of the piston and the inner annular part of the sealing element 72. The force of the piston 4o against the pendulum element moves it upwards, so that the seal 82 on the horizontal web 8o of the pendulum element closes the outlet openings 62. This upward pressure of the piston 4o on the pendulum organ Jo exceeds the combined downward pressure which acts on the pendulum organ from the container via the channel 9o and through the bias of the spring loo. In this state, the control chamber 66 is diverted to the outside air through the trigger valve sleeve Io4.

When the trigger 114 is pressed, the valve element llo is moved upwards, whereby the outlet port Io6 is closed and the supply port Io8 is opened to the control chamber put under pressure. The pressure in the regulating chamber acts on the pendulum element in order to make it more firmly against the outlet openings 62 to press. However, the pressure medium also acts via the channels 78 in the vertical web 76 against the top of the Piston 4o. If the pressure on this top side is sufficient, the pressure under-

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To overcome, the piston is moved downwardly away from the sealing surface 72. Once the seal is lifted is, the pressure from the container on the top of the piston via the large annular opening between the open upper end of the cylindrical sleeve 3o and the container chamber 28 exerted. This big opening enables that the pressure medium quickly and directly against the piston 4o acts and pull it down with a powerful fastening means driving stroke drives, so that the driver shaft attached to the Kolhen 12o down through the fastener drifting 16 move and drives the fastener out of this into the memory piece with a single stroke.

The position of the parts of the engine at this point is in PifT. 2 shown. As mentioned, the piston has moved downwards mainly due to the pressure medium which acts through the large open opening between the sealing surface 72 and the end of the cylindrical sleeve 3o. The pendulum element is held in an upper position by pressure in the control chamber 66. When the tool is to be reset, for example by releasing the trigger 114, the control valve element Ho moves to close the supply port Io8 and open the outlet port Io6 so that pressure from the control chamber 66 is discharged. As a result of the derivation of this pressure, the diMMte from the container 28y through the channel 9o

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acts, together with the force of the spring loo press the pendulum member downwards, so that the outer part of the sealing surface 72 comes to rest against the upper end of the cylinder 3o, whereby the opening between the cylinder and the container is closed. This position is shown in FIG. 3. In this position, the outlet openings 62 are open to the outside air, so that the inside of the cylinder 3o above the piston Ho is diverted to the outside air; under this condition, the pressure acting on the differential piston through the openings moves the piston upwards to move it into the in Fig. Returned position shown. As the piston moves up to the top of the cylinder, it contacts the interior of the seal 72, creating an annular seal at that point, and then tweets the pendulum up, first breaking the container B * cylinder seal and then the seal 82 is pressed against the outlet openings 62, whereby the channel 64 is closed . The motor is then reset and is ready for the next driving stroke.

As can be seen, are the parts of the driving-in as shown in Fig * 3 gezejgen position before the pressure on the line 24 on the tool is effective. In other words, the spring loo loads the pendulum element 7ο downwards to the annular opening between the container 28 and the

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To close the cylindrical sleeve 3o and to open the outlet channels 16. Hence, when the tool is pressurized the piston 4o is driven upwards in order to produce the seal between the pendulum element 7o and the piston, and only after this seal has been established, the opening between the cylinder 3o and the container 28 is opened. In this way, protection is provided against the actuation of the piston 4o during a driving stroke by the pressure medium supply created to the container alone.

In the embodiment described above, in A number of modifications may be made within the scope of the invention. For example, the pendulum organs need piston and the pendulum organ cylinder sealing surfaces on the pendulum organ 7o not to be in the same plane. Furthermore, the container shuttle channel 9o can be omitted, so that the spring loo alone (which is then somewhat heavier) the pendulum organ after burdened below. If desired, an arrangement of the type shown in Figures 4-7 can be used. With the driving motor a four-way valve is used instead of the one in Fio ·. 1-3 shown Three-way valve used. Two control chambers are provided to regulate the position of the pendulum organ and the pressure in these chambers is regulated by the four-way valve.

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The motor shown in FIG. 4 has a housing Io 'with a rearwardly directed handle part 2o' which forms part of the container chamber 22 *. At the front end of the handle 2ο ¹ a body part 26 'is provided, which forms a further chamber 28 ^f , which serves as a container and in which a cylindrical sleeve 3o ^{f is} arranged, in which a differential piston 4o' is located. A cap 54 * is attached to the upper end of the housing and has outlet openings 56 '. The cap carries a receptacle 54 for receiving one end of the preload spring loo ¹ and an annular outlet duct sealing element 156.

The pendulum argan used in this embodiment also acts as a combined piston stop-valve arrangement and has an elastic element 72 on its underside. ^{A cylindrical web 76 1} , which has a number of continuous radial channels 78 ¹ , wakes up from the underside. From an intermediate part of the vertical web, a flat part 60 extends radially outward, which carries a sealing ring. The vertically extending ridge 76 ¹ terminates in an annular sealing surface 164 which cooperates with the outlet seal 156 which is carried by the cap. From the lower part of the Pendeaiörgans extend from places adjacent to the elastic: Element 72 * a lot? ArffiS ί? Ο- nach ümen, «the one

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Wear peder receiving element 172, in which the lower end of the spring loo ¹ sits. In the position of the pendulum member 7o * shown in FIG. 4, a control chamber 15o is formed by the space below the flange part l6o and a second control chamber 152 is formed by the space above the flange part l6o.

As mentioned above, the control valve, which is operated by a suitable trigger, is a four-way valve, which has a sleeve 18o which is arranged within a valve housing 182. Inside the sleeve is a Valve actuating element 184 and a spring 186 are loaded the valve element 184 down into the position shown in FIG. The valve housing 182 has an inlet port , which is connected to the container 22, an outlet opening 192, a first control opening 194, which via a Channel 196 is connected to the control chamber 15o and one second control opening 198, which has a channel 2oo with the control chamber 152 is connected.

When the drive motor is not under pressure, the spring loo ¹ loads the pendulum member 70 'downwards so that the sealing element 72' contacts the upper end of the cylinder 30 'and closes this end. This provides protection against unintentional driving of the piston 4o when the tool is pressurized. When pressure on that

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Tool is exerted, the pressure medium flows through the openings 38 · in the cylinder J5o 'and acts against the differential cap to move it upwards in order to first create an annular seal between the piston and the sealing surface ^72f and then the seal between the pendulum member and the cylinder to accommodate the parts in the Pig. 4 position shown can be moved. In this position the four-way valve connects the control opening 194 with the outlet opening 192 and the control opening 198 with the pressurized inlet opening 19o, so that the control chamber 152 is pressurized and the control chamber 15o is connected to the outside air.

When the valve is actuated, the regulating opening 194 is connected to the container and the filling opening 198 is connected to the outside air. The regulating chamber 15o and the space above the piston are thereby pressurized through the pendulum organ openings 78 '. The pressure in the regulating chamber 15o is maintained the pendulum member 7o 'in the position shown in Fig. 4. When the pressure on the piston increases, it is moved away from the pendulum member, thereby breaking the annular seal between them and the full pressure from the container then exerted on the top of the piston 4o' is, whereby this is driven quickly na-jh down with a powerful driving stroke w'rcU UVi 0 division of the parts of the EJUibreibmoborM at dloaem time

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is shown in FIG.

To reset the motor, the control valve is returned to the position shown in FIG. 4, whereby the control chamber 152 and the outlet control chamber 15o are pressurized. The pressure in the control chamber 152 acts on the flange Ιβο and, together with the biasing force of the spring loo ^f, presses the pendulum element 7o ^f downwards against the seal 72 'at the upper end of the cylinder 3o' and at the same time opens the outlet openings 56 *. Since the part of the cylinder derived in this way opens above the piston to the outside air, the pressure through the cylinder 38 'acts on the differential piston and moves it upwards to the pendulum element 72'. (The position of the parts of the driving force generator is shown in Fig. 7). When the piston contacts the pendulum seal surface 72, it forms a piston-pendulum seal at this point, thereby canceling the pendulum-cylinder seal, and returns the parts to the position shown in FIG.

The invention is not limited to the described and illustrated embodiments, but can be used within experience any changes to their framework,

Patent claims:

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Claims (8)

Patent claims: 1.J compressed air fastener driving tool with a housing, a cylinder which is arranged in the housing and. an open upper end and a lower end has a mouthpiece that delimits a drive path for receiving fasteners from a magazine, which mouthpiece is attached to the mentioned housing adjacent the lower end of the cylinder, a piston within the cylinder, a fastener driving element, that on the mentioned piston at one end thereof for movement through the driving path during a Eintreibhubes the piston is attached, a container chamber in the housing for the supply of pressure medium to the cylinder through the mentioned open end with a piston driving stroke, means which delimit an outlet channel which has an opening which leads to the Connection with the face of the piston opposite to said one end is provided, characterized a pendulum member (7o; 7o ') adjacent the open end 009846/0243 -2ο- of the cylinder with a first surface part (inner part 7,2, 72 ') to rest on the piston surface opposite one end to form a seal between the pendulum element and the piston and a second surface part (82; 164) which serves to close the outlet channel close which piston (4o, 4o ') is normally loaded in sealing contact with the first surface part of the pendulum organ, so that the second surface part closes the outlet channel, means washing an opening between the upper end of the cylindrical sleeve Oo) and limit the outer part (72) adjacent to the open end of the cylinder, which establishes a connection between the container (28, 2 « ¹ ) and the cylinder (3o, 3o ·), which piston (4o, 4ο ¹ ) when it is in a position in the plant? Located on the first surface part, the connection between the container chamber (28, 28 ¹ ) and the mentioned cylinder blocks through the opening, which opening is fully opened during the driving stroke of the piston (4o, 4o ·) away from the pendulum member (7o, 7o ^f) is, and a control element (114, Ho, 184) for the supply of a pressure medium to the opposite surface in order to move the piston (4o) away from the pendulum element (7o, 7o ') with a driving stroke, and the second surface part in the closing ratio with Bezuc • - BATH 009846/0243 upright towards the outlet channel (62, 64, 56, 56 ') obtain. 2. Apparatus according to claim 1, characterized in that the Pendulum organ has a third surface part (outer part of the seal 72, 72 "), which on the cylinder (3o, 3o ·) to Attachment can come to close the mentioned opening. 3. Device according to claim 2, characterized by means (loo, loo ¹ ) and (88, 9o) to load the pendulum element (7o, 7o ') against the cylinder (3o, 3o ·), so that the third surface part ( Outer part) of the seal (72, 72 ″) closes the opening and the second surface part (82, 164) opens ^{the outlet channel (62, 64, 56, 56 1).} 4. Apparatus according to claim 3, characterized in that the means for loading the pendulum member against the cylinder through a channel (88, $> o) between the container and the Pendulum organ are formed. The load means are formed by a spring (loo, loo ·) cet be. 6. Apparatus according to the preceding claims, characterized by means (52 etc.). For the storage of the pendulum member adjacent to the open end of the cylinder, which storage (52 etc.) and which pendulum member (7o) form a control chamber (66) , and a Control element (Ho, 114) is provided for the supply of pressure medium to the control chamber (66) in order to regulate the movement of the pendulum element (7o). 7. Apparatus according to claim 6, characterized by a channel (78) in the pendulum member (7o), which a connection between the control chamber and the opposite face of the piston. 8. Apparatus according to claim 6, characterized in that the means for mounting the pendulum organ (7ο ¹ ) and this itself Syrian sicli zwsL K '^ elkamsaern (15o, 152) be "grtfsn ^ -m.) And fie; -;" .U ^: i. -i ^^ ^{-: i} Ci ^ ¹ ^ X * --- :-) ^ι: ο, f-iitu-o], MIF BATH assign to the supply of pressure medium to the control chambers (15o, 152) to regulate. 009846/0243 Empty ropes