DE2906330A1 - FASTENING DRIVING TOOL - Google Patents

Description

Patent Attorneys Dipi.-Ing. Curt Wallach

Dipl .-! Ng. Öünther cook

S 0 6 3 3 0 Dipl.-Phys. Dr Tino Haibach

Dipl.-Ing. Rainer Feldkamp

D-8Q0D Mündfen 2 · Kaufingerstraße 8 · Telephone (0 89) 24 02 75 · Telex 5 29 513 wakai d

Date _: 19, Feb. «79

Our mark: Eat

Harry M. Haytayan
Lincoln, Massachusetts, USA

Tool for driving fasteners

Patent Attorneys Di pi.-Ing. Curt Wallach

Dipl.-Ing. Günther Koch

• Ο 'Dipl.-Phys. Dr Tino Haibach

Dipl.-Ing. Rainer Feldkamp

D-8000 Munich 2 Kaufingerstraße 8 Telephone (0 89) 24 02 75 Telex 5 29 513 wakai d

19th Feb, 1979

Date:

Our reference: 16 4 90 - Fk / Ne

Harry M. Haytayan
Lincoln, Massachusetts, USA

Tool for driving fasteners

The invention relates to a tool for driving fastening means.

Today's commercial steelmaking processes generally require the manufacture of huge steel blocks from a source melt by pouring the molten metal into a mold, leaving these giant blocks during subsequent manufacturing processes be used. It is generally desirable that these blocks be substantially free of large air pockets getting produced.

It is well known in the steel industry that the undesirable large air pockets in the block arise in that Premature solidification occurs in the area of the top edges of the mold while the mold is being filled or while the metal is being used is still melted in the middle of the mold. This premature solidification must therefore be prevented, if substantially blocks free of air pockets are to be cast.

The typical method of preventing this solidification is to provide a lining with suitable insulation to be applied to the inner surface of the mold at its upper end, with such insulation materials under the trade names "Hot-Top" and "Riser" are marketed. The insulation prevents heat loss through the mold at its upper end, so that it is ensured that the melt does not "freeze" prematurely on the mold The preferred method of attaching the insulation to the mold is to attach it to the mold with the help of a nail-type To fasten fasteners, wherein the tip of the fastener penetrates the insulation and in the wall the shape is set with the head or shank of the fastener engaging a washer, which rests against the insulating lining and holds it firmly against the mold.

This fastening technique results in a large number of Trouble. Initially, it was found that the heavy cast iron molds used to cast the blocks oppose penetration of the fastening means more resistance than conventional steel. Therefore need a very high Power tools or nailing machines can be used to drive the fasteners. Farther it is due to the working conditions when driving the Fastening means required that these nailing tools are very mobile and have a low weight, so that the driving of the fasteners is facilitated. Eventually it turned out to be extremely important is to use the fastener in conjunction with a washer placed between the head of the fastener and the insulating liner is arranged to prevent the fastener from being excessive penetrates far into the insulating lining.

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So far, only driving tools actuated by explosion pressure have been used these requirements almost fulfilled. However, these explosive pressure actuated driving tools are relatively slow in their mode of operation, they are complex and dangerous to use and result in considerable amounts Noise and kickback problems. Furthermore, it is necessary with these known tools that the operator manually a previously assembled washer-fastener combination inserting this tool actuated by explosion pressure into the front end of the barrel, wherein the explosive charge above the fastener is arranged and only one fastener is driven in at a predetermined time by such a loading process can be. This manual loading of the washer / fastener combination and the explosive charge results a very low working speed of the tool. Furthermore, these known tools do not have any suitable ones Bracket and release extensions or approaches that would allow these tools to be attached to the respective Areas of huge cast iron molds (for example, with the dimensions of 1.5 x 1.2 χ 5 * 05 m) to use, such as they were described above so that workers would have to work in an inconvenient position when the insulation should be attached to the mold.

The invention is based on the object of providing a tool for driving in fastening means of the type mentioned at the beginning To create a way that is not very necessary when driving fasteners in conjunction with a washer is to slide a washer separately onto a fastener so that the operation of the tool is significantly accelerated, and this tool should also be suitable for the easy and quick driving of fasteners into cast iron molds.

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This object is achieved by the invention specified in claim 1.

Further advantageous refinements and developments of Invention emerge from the subclaims.

The tool according to the invention enables the driving of Fasteners in cast iron molds without the problems result that previously occurred when using driving tools actuated by explosion pressure. To this A very easy attachment of insulating linings to such molds is made possible because it is automatic a washer is incorporated into the fastener as part of the normal operation of the tool and the operator does not manually insert a washer / Fastener combination must be arranged manually on the tool for each driving operation. Furthermore, a Tool created that is relatively light in weight has and is therefore very movable, it being readily possible to use a handle assembly with an extension the trigger to use so the tool too can be used easily and without unfavorable working conditions in hard-to-reach places.

The tool according to the invention enables an adaptation of known driving tools, such as those used in, for example U.S. Patent 4,040,554 to the intended use for fastening insulating linings to cast iron molds using washers at the same time.

The insert cup dispenser is semi-automatic Operating mode washers from a washer magazine so that the washers on the workpiece through the heads of the fasteners are attached. The el-

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General pneumatic driving tool and dispenser for the washers are connected to one another to form a common assembly that is attached to a suspension device hung werder ^ cann, so that the assembly is essentially appears weightless and the actual driving tool and the washer dispenser can be operated from a considerable distance.

The invention is explained in more detail below with reference to the exemplary embodiments shown in the drawing.

In the drawing show:

Fig. 1 is a side view of an embodiment

of the tool showing the left side with selected parts broken away;

FIg. 2 is a sectional view of a preferred embodiment

management form of a pneumatic driving device in the embodiment of the tool can be used, the driving device shown in one position is in which the hammer is in the withdrawn or ready position is located;

FIg. 2A and 2B are enlarged views of parts of FIGS. 2y

Fig. 5 is a view similar to Fig. 2 showing the

same driving device shows in a position in which the hammer is at the end its Eintreibhubes is located;

4, 8 and 10 enlarged partial views of the front

one embodiment of the washer

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Dispensing device, wherein the dispensing device and the respective. Washers in different positions are shown;

Fig. 5t 9 and 11 cross sections of the washer dispensing inlet

direction along lines 5-5, 9-9 and 11-11 according to Figures 4, 8 and 10;

Figure 6 is a cross section of the washer dispenser

device taken along line 6-6 of Figure 7;

Fig. 7 is a partial view of the back of the supplement

disc dispenser;

Fig. 12 is an enlarged partial view of an embodiment

shape of the handle assembly when viewed from the line 12-12 of Figure 1;

Fig. 13 is a plan view of the embodiment

of the tool along line 13-15 after Pig. Ij

14 is an enlarged partial side view showing

shows the right side of the tool opposite a workpiece, being selected Parts are shown broken away;

15 is a perspective view of an embodiment

approximate form of a mechanism for fastening the tool when using it;

16 is an enlarged partial view of the front

a modified embodiment of the washer dispenser;

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Pig. 17 is a cross-sectional view taken along the line

17-17 according to Fig. 16.

The embodiment shown in Fig. 1 of the tool for driving of fasteners generally consists of a pneumatic driving tool 100 for driving the fasteners, a washer dispenser 200 for the semi-automatic arrangement of the washer on a Point where they can come into engagement with the fasteners, a handle assembly 300 for arrangement of the tool on a workpiece and for actuating the tool and a mounting assembly 400, with the Help the tool can be hung so that it appears substantially weightless.

The pneumatic driving tool 100 is shown in greater detail in FIGS. 2, 2A, 2B and 3. The driving tool 100 and the associated fastener magazine correspond essentially to a tool according to the US patent 4o4o 554 or the German Offenlegungsschrift 26 04 287, but with the exception that the housing has been modified to enable use with the tool of the invention. The actual driving tool becomes accordingly 100 is only described to the extent necessary to understand the present invention.

As can be seen in FIG. 2, the driving tool 100 generally has an outer housing 102 with a lower one Mouthpiece 104, with a poppet valve 106, a cylinder IO8 arranged in the center, inside the housing Control valve 110 and a safety valve 112 are arranged are. A fastener magazine 114 is attached to the mouthpiece 104. These components work in conjunction with associated parts in the manner to be described below. First, pressurized air is passed through the manifold chamber 120

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supplied so that the inlet port 122 is connected to a suitable source of compressed air, as described below will. This compressed air flows through the opening of the valve 110 (FIG. 2A) and acts on a valve plate 126 in such a way that the opening in a valve sealing plate 128 is closed. The flowing through the opening 124 Air continues to flow through an opening 129, a channel lj50 and a tube 13> 2 in a chamber 1 ^ 4 in which it has a force exerts on the upper end of the poppet valve 106, so that this poppet valve in the in Fig. 2 is pressed, In the one rubber washer I36 a good seal with the Top edge of cylinder I08 results. At the same time, compressed air is supplied to the air storage chamber I4o via channel Ij58 and flows through the opening 142 (FIG. 2B) of a safety valve 112 to press a valve plate 144 downward against a sealing plate 146 so that the outflow of Air from the outlet port 148 is prevented. The compressed air entering the chamber of the safety valve 112 continues to flow through a channel I50 into the interior of the Cylinder I08, so that a force is exerted on the underside of the Piston I52 is exerted against the piston upwards the sealing washer I36 of the poppet valve I06 holds. Between Air trapped at the top of piston I52 and sealing washer flows through passage I54 and vents I56 off. In the in FIg. 2 the tool is in its normal "ready for operation" Condition and it cannot be triggered before a safety mechanism operating rod I58 is pushed up far enough so that the valve plate 14.4 opens the opening in the Valve seat 146 releases. If the release lever I60 is pressed while the operating rod I58 is in your lower in fig. 2, the valve plate 126 changes its position and that on top of the poppet valve 106 acting pressure is generated by the outflow of compressed air from the can 1 ^ 4 via the pipe Γ52, the inner

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chamber in which the valve plate 126 is located, the valve opening 131 and the outlet port I62 eliminated. Hence moved the pressure in the air supply chamber 140 moves the poppet valve upwards, so that compressed air is applied to the top of the piston 152 can work. However, there is no movement of the piston because an equilibrium state of force due to the opposite acting force of the compressed air acting on the underside of the piston and the additional static friction forces due to the engagement of the seal 164 with the cylinder 108 and the rod-shaped hammer 166 with the stationary one Seal 168 occurs “However, when the safety mechanism operating rod I58 is pushed up far enough so that the valve plate 144 closes the opening 142 (FIG. 3), the valve on the underside of the piston I52 acting air pressure is relieved very quickly into the atmosphere by the fact that the compressed air via the channel I50, the bore 170 and the outlet port 148 flows out. If the operating lever 16O is now pressed, so that the valve plate 126 far is pushed up enough to close the opening 124, while the safety mechanism operating rod 158 is always is still pushed upwards (Pig. 3) * this is how the poppet valve moves IO6 very quickly in the direction of chamber 134 above and the full air pressure in the compressed air supply chamber 140 acts on the upper end of the piston 152, so that this moves very quickly over its normal working stroke and the hammer I66 with a fastening means 177 in engagement comes (which is advanced through the magazine 114), whereby this fastening means from the opening 181 of the Mouthpiece of the driving tool 100 is driven out. The piston I52 only then returns to its normal starting position back when both the operating rod 158 as the release lever I60 can also be released. The driving tool Is then ready for renewed operation, with a new fastener automatically being fed through the magazine 114 is inserted into the work chamber. In the case of the above

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The preferred embodiment described gives the safety mechanism -Actuating rod I58 under a force of approximately 2.27 kg.

At the front end of the IQO driving tool there is a sheet dispenser 200 for the semi-automatic arrangement of washers attached to a point where the washers engage fasteners can when they emerge from the mouthpiece of the driving tool 100. The washer dispenser 200 is shown in detail in FIGS. 1, 4 to 11 and IJ and 14. The embodiment of the dispensing device shown in FIGS. 4 and 5 generally consists of a Bellag disk magazine 202, in which one or more washers 204 are slidably stored, a locking device in the form of a swivel plate 206 for dispensing the washers from the magazine 202 and a washer holder 208 for holding a washer in place before engaging a fastener.

The magazine 202 consists of a long metal rod 210 with a flat front surface 212 and rare surfaces 214, like this In FIg. 6, a longitudinally extending channel 216 is formed in the front surface 212. The channel 216 consists of a bottom 217 and side guides 219 and it has a cross-sectional profile according to FIG. 6 on. The side guides 219väBisen a suitable size so that they Guide metal washers 204 slidably along the length of rod 210. As can be seen from FIGS. 4 and 5 Is, the bottom 217 of the channel 216 is removed in the vicinity of the bottom of the metal rod 210, so that an opening 215 is formed in which a pivot plate 206 is arranged. The pivot plate 206 is bevelled with front Surfaces 218 and 220 provided and can pivot about a rod 222, the ends of which in the openings of the sides of the metal

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rod 2LO are anchored so that surfaces 218 and 220 alternately essentially level with the bottom surfaces 221 (Fig. 6) of the side guides 219 can be aligned. The pivot plate 206 carries two pins or protrusions 224 that extend perpendicularly outward from the surface 218 while two pins 226 extend perpendicularly outward from surface 220. Pins 224 and 226 are sized so that (1.) when surface 218 is substantially aligned with surfaces 221 of channel 216 is, the pins 224 can serve as stops for washers 204, which slide along the tracks 219, and that (2.) if the surface 220 is aligned with the surfaces 221 of the guideways 219, the pins 226 as stops for washers that slide along the guideway 2I9, and that finally (3rd) when a pair of these pins in the movement path of the washers occurs, the other pair of pins completely withdrawn from this movement path is.

The Beilagscheiben- ^H age 208 is pivotally attached to the lower end of the metal bar 210 by a pin 228, the holder 208 has a base 230 and a cover plate 233, wherein the base plate has a central bore 232 having a diameter slightly larger than is the diameter of the fasteners to be used. The holder 208 also has a counterbore 234 with a diameter that is slightly larger than the diameter of a washer, and a curved flange that forms a shoulder 236. A washer channel 238 is formed between the base plate 230 and the cover plate 233 so that when the channel 238 is properly aligned in the same plane as the washer channel 216 in the metal rod 210 (as will be further discussed below) a washer can slide under the action of gravity along the channel 216 and past the pivot plate 206 into the lowering

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Hole 2 ^ 4 of the holder 208 can enter. Two steel pins 244 in the base plate 2 ^ 0 at the approach 2 ^ 6 are used for recording of the forces when the washers fall and they act as stops while two cylindrical magnets 242 in suitable Holes in the plate 230 are attached to the washers to be held in the counterbore 2 ^ 4.

The pivot plate 206 is actuated to permit the advancement of washers from the magazine 202 into the holder 208 is controlled by means described below. Two leaf spring elements 246 and 248 and an actuating mechanism 250 (FIGS. 4 to 7 and 11) are used for pivoting of the pivot plate 206 on the rod 222 in such a way that the passing of washers 204 on this pivot plate 206 is made possible. The spring elements 248 are attached to the rear of the metal rod 210 with the aid of screws 249 and they extend over the rear of the pivot plate 206 while the spring elements 246 on the rear of the base plate 230 of ^ age 208 fastened with the help of screws 25I and extend across the rear of the same pivot plate 206. The spring elements 246 hold the holder 208 normally in the angular position shown in FIG. 5. In this position, the spring elements 248 generate a greater compressive force on the pivot plate 206 than the springs 246. If however, the washer retainer 208 is pushed inwardly so that its channel 238 is in the same plane with the channel 216 lies in the metal rod 210, the force of the spring elements 246 exceeds the force of the springs 248.

The actuation mechanism 250 shown in Figures 4 to 7 consists of a tongue 252 which is slidable in a arranged in the metal rod 210 arranged channel 254 and which is slidably held in place by a plate 255 which is screwed to the metal rod 210. The tongue 252 is with the aid of a spring arranged in the channel 254 256 pressed down in the direction of the holder 208, so.

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that the tongue 252 extends over the rear edge of the pivot plate 206 when surface 218 is aligned with surface 221 so that the pivot plate is in the position shown in FIGS Figures 4, 5 and 7 is locked position. A pin 258 is attached to the tongue 252 and it can be in a elongated opening 2βθ in the plate 255 slide. the Port 260 is designed to allow manual push back (by means to be described against the pin 258) against the action of the spring 256 and far enough to allow it to disengage from pivot plate 206. When this is done, the swivel plate becomes automatic pivoted into the position shown in FIGS. 8 and 9 due to the greater force of the springs 248. the The swivel plate can then be rotated back into the position shown in FIGS is pushed into .a vertical (flat aligned) position according to Figures 10 and 11, so that the channels 216 and 238 are aligned with each other and the force of the spring elements 246 exceeds the force of the spring elements 248. The back of the protruding part of the tongue is more suitable Beveled so that the tongue can give way inwards under this effect. The washer dispenser works in the following way: Assume that the mechanism is in a "loading position", as shown in FIGS. 4 and 5. In this state, the holder 208 is at an angle to the metal rod 210 and the surface 218 of the pivot plate is substantially flush with the surface 221 of the guideways 219 aligned. A number of washers 204 can then be inserted at the top of the channel 216, the Gravity moves the washers down until the pins 224 stop further movement. Pressed next the operator appropriately (and with facilities to be described) the pen 258 so that the tongue 252 is disengaged from the pivot plate 206 so that the springs 248 the pivot plate around the

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Axis 222 can rotate and the mechanism is in standby is brought into position, as shown in FIGS. During this process, the pins 224 are removed from the Movement path of the washers pulled out while the pins 226 are moved into this movement path, so that insert the washers along the magazine 202 into their new ones Position can fall. Finally, the dispenser brought into the driving position in that the holder 208 is pressed into the position shown in FIGS so that channel 2 ^ 8 is aligned with channel 216 and the pivot plate 206 is rotated again under the action of the spring elements 246, so that the pins 224 be brought into the movement path of the washers. When the plate is pivoted at this time, the pins 226 pulled out of the path of movement and the first washer falls into the counterbore 2 ^ 4, in which it passes through the Magnet 242 is held and is in a ready position in which they are with one of the driving tool 100 dispensed fasteners can come into engagement.

The washer dispenser 200 is on the driving tool 100 attached in the following manner. First, there are two support struts 280 on the mouthpiece 104 of the driving tool 100, as shown in FIGS. 1 and 14. The dispenser 200 is attached to the support struts 280 screwed on with the aid of screws 282 (Fig. 4). The dispenser 200 is on the driving tool 100 mounted so that when the holder 208 is pushed inwardly to align with the Bellag washer magazine 2o2 the holder 208 comes into contact with the mouthpiece 104 and the bore 232 in the holder 208 with the opening 181 in the mouthpiece (FIG. 11) of the driving tool 100 is aligned. An anti-wear pin 286 (Figs. 4 and 11) is mounted in the holder 208 and comes

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in contact with the safety mechanism operating rod I58, when the holder 208 is pushed backwards.

A handle assembly 300 for ease of simultaneous Operation of the driving tool 100 and the washer dispenser 200 is provided to facilitate the use of the tool, particularly on hard-to-reach areas To facilitate places, for example around the top of large cast iron molds, as described above became. This handle assembly is shown in Figures 1 as well 12-15 and generally includes two handlebars 302, two auxiliary handlebars 304, and a handle 306. the Lower ends of the holding rods 302 are on tabs formed integrally with the housing of the driving tool 100 308 attached by means of a pin 310. The support rods 302 extend upwardly at an angle and off the driving tool away and they come together near their upper ends so that a single approach to attaching it Handle 306 is formed. The auxiliary support rods 304 are in turn on a one-piece with the housing of the driving tool 100 formed lug 312 with the help a pin 314 attached. The auxiliary support rods 304 extend upwardly away from the driving tool and they are united with the support rods 302 between their ends by means of a pin 316. The auxiliary handrails 304 serve to fix the holding rods 302 in a predetermined position with respect to the driving tool 100.

The handle 306 is attached to the upper end with the united ends of the support rods 302 and a support strut 320 extends between one end of the handle 306 and a support plate 3I7 (Fig. 12) attached to the handlebars 320 is attached. A second support strut 321 extends between the support plate 317 and the washer magazine 202. Furthermore, a handle 322 on the support rods

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302 above the support strut 521.

A release lever 323 is inserted into the handle J5O6, which is pivotally mounted in this handle and which the driving tool and the washer magazine over can operate devices yet to be described. As can be seen from Fig. 12, are on the underside the support plate 317 two fasteners 326 attached, the hold a pin 328 slidably. Two connecting rods 330 and 331, which are connected to one another by a turnbuckle 332 are used to connect the release lever 323 to the pin 328, so that this is along the attachment 326 shifts when the release lever is pressed. Of the Pin 328 is in turn connected to a ventilation rod 333 via two rigid support rods (FIGS. 1 and 13), which is pivotally mounted between two arms 334 (of which only one is shown) which in turn is pivotally attached to projections 336 with the aid of pivot pins 327 which are integrally formed with opposite sides of the housing of the driving tool. The rod 330 is in light contact with the release lever I60. The pin 328, the rods 335, the rod 333 and the arms 334 are arranged such that when the pin 328 passes through Pressing the release lever 323 is moved upwards, the rods 335 a pivoting movement of the rod 330 and the Arms 334 around the pin 337 cause the actuator rod 333 are pressed against the release lever 16O so that this is depressed. When the pulling force on

loading

the release lever 332 is eliminated ^ the return effect acts of the release lever I60 a movement of the linkage parts in the reverse direction so that the release lever 323 is moved back to its original position. In this way the release lever 323 can be used to actuate the driving tool 100 can be used.

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As shown in Fig. 14, the operating rod 333 is further engaged with a yoke, the side portions 340, which are pivotably attached to a pin 310 and which are pivoted about this pin when the operating rod 353 is rotated, and a connecting portion 341, which is attached to a linkage 342 1st and actuated this. The linkage 342 is pivotable with a End of a U-shaped lever 255 connected to one part of the actuation mechanism 250 forms. The lever 255 is pivotally attached to the support struts by means of pins 281 and arranged so that it engages with pin 258 (Flg. 8 and 13) comes into engagement and serves to slide the tongue 252 up along the metal rod 210, when the release lever 323 is pressed. To these catfish the release lever 323 is used to actuate the tongue 252 of the Washer dispenser and the driving tool 100.

The combined sub-assembly from the pneumatic driving tool 100, the washer dispenser 200, and the handle assembly 300 may appear to be free of weight a bracket assembly 400, as shown in Figures 1 and 15. At the inlet port 122 of the housing 102 of the driving tool, a rigid compressed air tube 4θ2 is attached, which is used to hold the Tool as well as for supplying compressed air to the driving tool 100 via a connection piece 404 which via a compressed air hose (not shown) with a suitable compressed air source, such as a (also not shown) air compressor is connected. The bracket assembly 400 includes a block 403 that attaches to the tube is attached and the tube 402 connects to the connector 4o4. Furthermore, the mounting assembly has a suspension component 4o6, which is attached to the block 403 and serves as a connection piece to a rope 4O8. This rope is with

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an automatic counterbalancing mechanism 410 and a second rope 411 with a suitable support arrangement 412 connected, which allows the tool to move freely in two directions in a horizontal plane. The weight Balancing mechanism 410 is a common well-known mechanism, one such mechanism being under the trademark AERO-MOTIVE BALANCER from Aero-Motive Mfg. Co., Kalamazoo, Michigan / USA. Suffice it to say at this point that the cable 4θ8 is spring-loaded Drum or wheel is wound which forms part of the counterbalancing mechanism 410 and that the rope can be pulled out or retracted when the gravity acting on the tool is overcome by the operator moving the tool up or down with the tool in any given position stops when the operator lets go of the tool. If this is desired, the counterbalancing mechanism 410 can be modified to automatically move the tool to a preset height each time when the operator releases the tool.

The bracket assembly 412 can have a variety of shapes. As an example, this mounting arrangement can be a motor-driven one Be a crane. It can also be relatively light so that it can be operated by hand. So can the mounting arrangement 412 have two parallel rails 416 which are arranged stationary and which, for example, on the Ceiling or suspended from a roof structure of a steel mill, wherein a main carriage 418 with wheels 420 and 422 can run on rails 416. A second carriage with wheels 426 which are in a groove 428 of the carriage 418 run, carry a rigid downward hanging yoke 430, which serves as an attachment point for the rope 411. A third rope 432 is attached to the yoke 430 and with a suitable one Handle 434 provided at the lower end. The rope 432 is used by the operator to move the carriage

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and 424 used to move the tool to the desired working position to move.

The following is the installation and operation of the embodiment of the tool. First, the tool is attached to the bracket assembly 412 and a Compressed air hose is connected to the connector 4o4 so that the driving tool is appropriately supplied with compressed air is applied. Then one with fasteners Filled magazine attached to the driving tool. Next is the washer dispenser by hand placed in the "loading" position and there will be a multitude of Washers inserted into the top of the washer magazine. The washers take the ones shown in FIGS and 5 position shown. When the operator depresses the release lever ^ 23 on the handle assembly, the washer dispensing mechanism brought into its ready position so that the washers in the figures 9 and 10 position shown may fall. In this case, no fasteners are removed from the hammer from the mouthpiece driven out because the safety mechanism operating rod 158 is not yet pressed.

The tool is now ready for use. The operator grips handle 322 with one hand and the other Hand on the handle 306 and bring the tip of the tool against a workpiece as shown in FIG. In the case of preparing molds for casting steel blocks the workpiece consists of an insulating lining 500, which are attached to the inner surface 502 of a mold 504 target. Only little effort is required to move the tool because the mounting arrangement running on rails 412 allows for free horizontal movement automatic counterbalancing mechanism 410 makes the tool appear to be weightless. When the workpiece touches the washer holder 208 is pushed inward

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(as shown in Figure 14) so that it is aligned with the washer magazine and a washer is released from the pins 226 of the pivot plate 206 and advanced into the holder 208. This brings the shim delivery direction into the release position described above. At the same time, the actuating rod I58 of the safety mechanism is pushed back through the back of the holder 208 so that the tool is ready to be released. If the release lever 323 is now pressed, a fastener is shot out of the driving tool. The shaft of this fastener passes through the central opening of the washer in the holder 208 and the head of the fastener engages the washer, thereby moving the washer along with the fastener towards the workpiece. The fastener penetrates the insulating liner 500 and enters the side wall of the mold far enough for the head or stem of the fastener to clamp the washer against the liner. The release lever is held in the depressed position when the kickback of the driving tool drives the tool away from the workpiece, the holder 208 returning to its angled position (Fig. 5) and bringing the Bellagschelbe-Abgabeelnrlchtung to the standby state. When the release lever is released and the attachment of the tool is brought against the workpiece again, the delivery device \? ^e 5n transferred to the release state and a further fastening process takes place. This process is repeated until either the magazine for the fasteners or the magazine for the washers is empty or until the work is finished.

The embodiment of the tool described above for driving in fasteners !! just hires Example and a large number of changes are possible,

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without departing from the scope of the invention. In this context reference is made to FIGS. 16 and 17, in the parts a further embodiment of the tool for driving of fasteners are shown. In the case of the figures The embodiment shown in Figures 16 and 17 became the washer dispensing device and certain parts of the driving tool modified. The modified washer dispenser 200A has a vertical magazine 506, one in the magazine 506 arranged channel I08, a first arranged in channel 508 Bore 510 and a flange 512 with a semicircular inner surface 514 that is concentric with the bore 510 is. The flange 512 has a bore 516. The channel 508 has a cross section which corresponds essentially to that of the groove 216 of the washer dispenser 200 and this channel 508 serves to slidably guide a plurality of washers 204 along the magazine 506. Inner surface 514 of flange 512 forms one End wall for the channel 508 and serves to hold washers, which under the action of gravity from the upper part of the magazine 506 are delivered to determine their position. The curvature the surface 514 is such that it is slightly larger than the corresponding outer dimension of the washers 2o4, see above that their ends are flush with the sides of the channel 508 in the manner shown. Two magnets 5I8 are in the magazine 506 is inserted to hold the washers 204 in alignment with the bore 510. A pen 520 is embedded in the magazine 506 along its centerline in the surface 514 to the force of gravity to absorb falling washers. The bore 5IO has a diameter that is slightly larger than the maximum diameter of a fastener.

The driving tool mouthpiece 104 and the safety mechanism operating rod I58 are slightly modified as shown in Fig. I7. A slot 526 is in the Mouthpiece 104 incorporated and the actuating rod I58

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Is formed with an offset portion 159. The magazine 506 is on the driving tool 100 by means of screws 282 and arranged so that the hole 5I0 with the Opening 181 of the mouthpiece is aligned while the operating rod of the safety mechanism passes through the slot or the hole 516 protrudes outward.

The modified embodiment of the Bellag disc dispensing direction works as follows: First a number of washers are inserted into the top of the magazine 506, falling under gravity along channel 508, until the lowest washer rests against pin 520. The ends of the curved surface 514 of the flange 512 limit lateral movement of the washer and therefore cooperate with pin 520 to center the washer with respect to bore 510. The magnets 518 serve to hold the washer in place with the other washers along the magazine 506 be held by the bottom washer. Next, the tool is held against a workpiece so that the Safety mechanism operating rod I58 pushed inwards and the tool can be triggered. Then, when the release lever 525 is operated, a fastener becomes knocked out of the driving tool. The fastener exits and comes out of mouthpiece 104 with the lowermost washer in engagement, so that this out of the magazine and in the direction of the workpiece is moved. When this happens, the rest of the shims fall down under the action of gravity until the lowermost washer has a position on the stop pin 520 occupies. The tool is then ready for use again.

Other changes are also possible. One such change could be that a long rod could be used ^ around the trip lever 323 with the pin

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2Ά -

to couple, whereby the mechanism described above can be omitted. Another change could be to form the holding devices for the tool in a different way.

The embodiments of the tool described above for driving in fasteners result in a variety of advantages over known tools. First, the tool is operated pneumatically, so that all undesirable Properties of driving tools actuated by explosion pressure are avoided (e.g. noise, kickback, Smoke, safety issues, slow operation, etc.). Furthermore, the tool can be used automatically with each fastener remove a washer from a washer magazine, without the need to manually insert a previously assembled fastener and washer combination into insert a holder before the fastening process takes place. This increases the working speed. Farther the tool is provided with a handle attachment to enable the tool to be used in hard-to-reach places to facilitate, for example, around the top of cast iron molds around, as explained above. Finally, the tool comes with a bracket assembly provided, which makes it appear relatively weightless to the operator.

Because the flange or extension 2J56 is made thicker As the rest of the washer holder, it is always ensured that the holder is in the position shown in FIGS Is brought into position when it is brought into contact with the workpiece, even when the workpiece is not completely just 1st. Since it is ensured that only one washer is fed at a given point in time jamming of the tool is reliably avoided. The tool can still only be triggered if it is in contact with a workpiece. Another advantage

030007/0646 ' ^f '

part is that in a simplified embodiment, the washer dispensing device can be omitted, in which case the magnets 242, 518 or other suitable Bellag washer holding devices can be attached directly to the end surface of the mouthpiece 1O ¹ I- of the tool, so that washers can be manually placed on the tool in a position where they can be picked up by a fastener as it exits the mouthpiece and enters a workpiece.

The tool according to FIGS. 1 to 13 can thereby be modified be that the magnets 242 are omitted because the washers only fall on the holder when this is in engagement with a workpiece. Furthermore, if a washer falls down on the holder 208 and when the tool is withdrawn from the workpiece without triggering the washer on the holder through the Gravity held (because the holder is at an angle to the vertical when it is not | by contact with is pushed back on a workpiece.)

030007/014

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Claims (14)

Patent attorneys Dipl.-Ing. Curt Wallach Dipl.-Ing. Günther Koch D fi ^ Ί G Dipl.-Phys. Dr Tino Haibach U 00 Y U Dipl.-Ing. Rainer Feldkamp D-8000 Munich 2 · Kaufingerstraße 8 ■ Telephone (0 89) 24 02 75 · Telex 5 29 513 wakai d Date: Feb. 19, 1979 Our reference : Iß 490 - Fk / Ne Claims Tool for driving in fastening means, characterized in that a hollow housing (102) with first and second opposite ends it is provided that first end portions the first end of the housing (102) close and have a first opening (181) which is in communication with the interior of the housing (102), that a hammer (166) is arranged longitudinally within the housing (102) and longitudinally through the first opening (181) in the first end portions between a first retracted position and a second extended position Position is movable that means (108, 152) for driving the hammer (166) from one to the other of first and second positions are provided, at least some of these devices (108, 152) being within dss housing (102) is arranged that means (114) for the arrangement of a fastening means (177) on a Place are provided at which the hammer (166) can come into engagement with this fastener to this drive out of the first opening (181) in the first end portions, that washer dispensers (200) for receiving and holding a plurality of washers (204) and for the separate arrangement of each washer (204) are provided in front of the first opening (181) in such a way that that (a) only one washer (204) for a 030001/0646 2306330 given time before the first opening (181) in the first End parts is arranged and (b) each washer is arranged in front of the first opening (181) that one Central opening of the washer is essentially aligned with the first opening (181) that the central opening is dimensioned such that its diameter is smaller than the maximum diameter of the fastener (177), and that the washer dispensers (200) are further adapted to (a) one Engagement of the fastener (177) with the one Washer (204) allow when the fastening means the first opening (18l) in the first end parts leaves that (b) this one washer (204) is released when it is fastened to the fastening means (177) comes into engagement, and that (c) a further washer is arranged in front of the first opening (181) after a washer was given. 2. Tool according to claim 1, characterized in that that the washer dispenser (200) has a magazine (202) with first and second opposed End and with guide devices (216) for sliding Mounting of the washers along the magazine and for successive individual feeding of the Bellag- egg lock washer on the first end of the magazine ^ that the dispensers furthermore a locking mechanism (206) for dispensing the washers (204) individually at the first end of the magazine and that a holder (208) is provided which is adjacent to the first end of the magazine and receives the washers from the magazine, one washer in front of the first opening (I8I) is held and the holder (208) with a central opening (232) is provided with the first opening (181) is alignable in the first end portions and allows the passage of a fastener (177). 030007/0641 3 «tool according to claim 2, characterized in that that the washer holder (208) is pivotally attached to the magazine (202) and washers (204) only picks up from the magazine (202) when the holder (208) is in the same plane with the magazine (202) is aligned with the central opening (232) is aligned with the first opening (181). 4. Tool according to claim 3 »characterized in that the holder (208) has a channel (238) and one front counterbore (234) has that the counterbore (234) with the channel (238) and the central opening (232) in Connection is and has sufficient dimensions to receive a washer (204) and that the channel (238) washers (204) transported individually from the first end of the magazine (202) to the front counterbore (234). 5. Tool according to one of claims 2 to 4, characterized in that the ^ age (208) with has at least one magnet (242) for holding a washer (204) in front of the first opening (181). 6. Tool according to one of claims 2 to 5, characterized in that the locking mechanism a pivot plate (2o6) which is in an opening (215) of the magazine (202) at the first end of the magazine is attached and can be pivoted about an axis (222) which is arranged perpendicular to the longitudinal axis of the magazine (202) is that the pivot plate (206) has first and second front surfaces (218, *. 220) that coincide with first or second stop parts (224, 226) are provided, which are in the path of movement of the magazine sliding along Washers (204) enter when the pivot plate (206) is pivoted, so that when the first stop 030007/0646 " ⁴ '29Ö633Q parts (224) are moved in the path of movement of the washers, no washer is attached to the first stop parts can move past and the second stop parts (226) completely out of the path of movement of the washers (204) are pulled out while when the second stop parts (226) in the movement path of the washers (204 are moved, no washer can move past the second stop parts (226) and the first Stop parts (224) are completely moved out of the path of movement of the washers. 7. Tool according to claim 6, characterized in that that pivoting devices (246, 248) are provided which cause the pivoting plate (206) to pivot in such a way that that the first wire held the second stop parts (224, 226) in the path of movement of the magazine (202) Washers are moved so that the pivoting devices are first located between the holder (208) and the pivoting plate (206) extending peder elements (246) and second spring elements (248) extending between the magazine (202) and the pivot plate (206), so that when the holder (208) is arranged in the same plane as the magazine, that of the first spring elements (246) force exerted on the pivot plate (206) exceeds the force exerted by the second spring elements (248) is exerted on the pivot plate (206), whereby the first stop parts (224) in the movement path of the Washers (204) are moved while when the holder (208) is not in the same plane as the magazine (202) is arranged by the second spring elements (248) on the pivot plate (206) force exerted by the first spring elements (246) on the pivot plate (206) exceeds exerted force, whereby the second stop parts (226) in the movement path of the washers (204) are moved and that devices (252) 030007/0646 are provided for selectively locking the pivot plate (206) in a position in which the first Änsehlagteile (224) see in the movement path of the washers (2O ² O in the magazine (202) are. 8. Tool according to one of the preceding claims, characterized characterized in that the magazine (202) is attached vertically to the first end share and that the Washer (204) the locking devices by gravity are fed. 9. Tool according to claim 1, characterized in that that the washer dispensers have a magazine (202) with first and second opposed Ends and with a longitudinally extending groove (216) at the front in which the washers (204) slidably guided along the magazine and fed to the first end that in the first end of the magazine (202) an opening (2J52) perpendicular to the front is provided that means (244) on the front of the magazine (202) for collecting a washer sliding along the groove (204) are provided in such a way that the washer is stopped in alignment with the opening (2j52) and that the magazine is attached to the first end parts in such a way that the opening (232) with the first opening (181) is aligned in the first end parts. 10. Tool according to claim 9, characterized in that that the magazine (202) with a magnet (242) for holding a washer (204) in alignment with the opening (2J2) is provided until the washer engages a fastener (177) driven by the tool (100). ~ ⁶ ~ 2S0633Q 11. Tool according to one of the preceding claims, characterized in that the housing (102) on a handle assembly (300) attached to it is used to arrange the tool at a work position and that the handle assembly (300) has means (333 » 335) to operate the devices for driving the Hammer (166) and locking mechanism (206) in a coordinated manner. 12. Tool according to claim 1, characterized in that the housing (102) on a handle assembly (300) is attached, which is used to bring the tool to a working position and that the handle assembly Includes means (333) for actuating the means for driving the hammer (166). 13 · Tool according to claim 11 or 12, characterized in that the handle is on an automatic Weight balancing mechanism (400) is attached so that the tool is suspended relatively weight-free. 14. Tool according to one of the preceding claims, characterized in that the devices for Drive the hammer (166) include a pneumatic piston mechanism (I52). 030007/0 * 46