JP2000354979A - Tool having combustion power - Google Patents

Abstract

PROBLEM TO BE SOLVED: To protect a nose piece of a tool from a shock by forming and arranging a shield to form a cavity between the nose piece and the shield, and inclining the same from the upper end part to the lower end part. SOLUTION: In order to protect four side surfaces of a nose piece 26, a shield 73 is formed and arranged to protect at least three of the side surfaces, and a fourth side surface is brought into contact by a fastener magazine 22 and engaged. At least one operation opening 94 in the shield 73 is given to operate a drive control screw on the nose piece 26. Each operation opening 94 is formed and arranged to operate only one drive control screw at one time. Plural operation openings 94 are given so that the shield 73 of the same nose piece is used on various tools 10. Further, the shield 73 is constructed to form a cavity 95 between the nose piece 26 and the shield 73 to control the drive.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates generally to portable fastener driven tools with combustion power, and more particularly to shields for protecting the workpiece contacting elements of the nosepiece of such tools.

[0002]

2. Description of the Prior Art A portable combustion powered tool used to drive fasteners into a work piece is disclosed in U.S. Pat. Patent Nos. 32452 and 452
No. 2162, No. 4483473, No. 448347
No. 4, No. 4403722, No. 5197646,
No. 5,263,439, No. 5,558,264 and No. 5,687,899. A tool for driving nails and staples with similar combustion power is available from ITW Paslode, Vernon Hill, Illinois under IMPULSE®.
Available commercially from.

[0003] Such tools incorporate a generally pistol-shaped tool housing surrounding a small internal combustion engine. The internal combustion engine is powered by a compressed fuel gas canister, a so-called fuel cell. A battery-powered power distribution device scatters sparks for ignition, and a fan located within the combustion chamber facilitates effective combustion of the chamber and scavenging, including exhaust of combustion by-products. Works for both. The internal combustion engine has a reciprocating piston having an elongated rigid rod disposed within a cylindrical body.

[0004] The valve sleeve can reciprocate axially around the cylinder and moves through the link to the vicinity of the combustion chamber when the workpiece contact element at the end of the link is pressed against the workpiece. This pressing action starts the fuel metering valve and introduces a certain amount of fuel into the closed combustion chamber.

When the trigger switch is pulled, which causes ignition of a charge of gas in the combustion chamber of the internal combustion engine, the piston and the driver rod are flipped downward, impacting the fasteners arranged and driving them into the workpiece. I do. The piston then returns to its original or "ready" position due to the differential pressure in the cylinder. The fastener is fed in a magazine style into the nosepiece, and the fastener is held in an orientation that is properly positioned to receive the impact of the driver rod. Combustible fuel /
When the air mixture is ignited, the combustion in the chamber accelerates the piston / driver rod assembly, causing the fastener, if any, to penetrate into the workpiece.

[0006] The nose piece of the tool has a pair of upper and lower guide members for guiding the driver rod toward the uppermost nail of the nail strip. The fastener is guided to the workpiece end by the nosepiece workpiece.

[0007]

A disadvantage of such conventional combustion powered tools is that the nosepiece is not surrounded by a housing. Therefore, in some applications, the nosepiece can be damaged, for example, if the operator drops the tool. Further, the nosepiece is adjustable to change the depth at which the fastener is driven into the workpiece. These adjustments are generally made by the operator of the tool.
Therefore, there is a need to protect the nosepiece and the corresponding components of the nosepiece from external forces. There is a need to protect the depth adjustment from inadvertent impact or interference by the operator or others. Further, there is a need to protect the nosepiece of a combustion powered tool of the type used to drive fasteners into a drywall passage. The drying wall passage provides a substantially narrow area for functional steering of the nosepiece of the combustion tool.

As a result, it is an object of the present invention to provide an improved portable combustion powered fastener driven tool having a shield to protect the nose piece of the tool from impact.

It is a further object of the present invention to provide an improved portable combustion powered fastener driven tool having an operating opening including a nosepiece shield for manipulating nosepiece depth adjustment. is there.

It is a further object of the present invention to provide an improved portable combustion power having a nosepiece shield configured to be able to operate unobstructed while operating within the boundaries of a drywall passage. Is to provide a fastener driving tool provided with:

[0011]

SUMMARY OF THE INVENTION The object set forth above is to be fixed to the tool housing and configured to surround the nosepiece without interfering with operation.
Satisfied or achieved by a tool with the present combustion power for driving a fastener featuring a shield. An operating aperture is provided in the shield for operating the fastener drive depth adjustment mechanism.

In particular, the present invention provides a combustion powered tool for driving a fastener having a housing containing a main chamber. A power source having a combustion end and a lower end surrounded by the main chamber is in the main chamber. The rod is driven by the combustion end of the power source. A device is provided for continuous fastener delivery for engagement with the rod.
The nosepiece has a tool end and a workpiece end opposite the tool end, and depends from the lower end of the power source. The nosepiece is configured to receive a rod from the lower end of the power source and guide the rod toward the workpiece. The workpiece contact element is slidably mounted on the nosepiece. A protective shield is further provided for protecting the nosepiece and the workpiece contact element. A shield configured and arranged to form a cavity between the nosepiece and the shield,
It is inclined from the upper end to the lower end. In another embodiment, the shield is dimensioned to be functionally steered in a drywall truck.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring now to FIGS.
A combustion powered tool of a type suitable for use with the present invention is indicated generally at 10. The tool 10 includes a housing 12 having a main power source chamber 14 sized to enclose a self-stored internal combustion power source 16, and a main chamber 14.
A fuel cell chamber 18 (shown in phantom) that is substantially parallel to and adjacent to the fuel cell chamber, and a handle portion 20 extending from one side of the fuel cell chamber and opposite the main chamber.

Further, a magazine 22 of a fastener is disposed under the handle portion, and the main compartment 14
From a lower end 28 of the nosepiece to a hanging nosepiece 26. Preferably, the magazine 22 contains a band of claws, as shown, but may alternatively contain coiled claws, as shown in US Pat. No. 5,558,264. Tool 10
A battery (not shown) is provided to supply power to the battery, and the battery is releasably housed in a tubular compartment (not shown) disposed in the handle portion 20.

The terms "lower" and "upper" as used herein are used to refer to the tools 10, 102 in the operating configuration, as shown in FIGS. And the term "front side" is used to refer to the left side of the tool 10, 102, as shown in FIGS. 1, 2 and 7, however, in various arrangements depending on the application. It should be understood that the present invention can be used. A combustion end 30 is opposite the lower end 28 of the main chamber, and the combustion end 30 is provided with a plurality of suction vents 32.

A pressurized liquid hydrocarbon fuel, such as MAPP, is contained in a fuel cell (not shown) and is pressurized by a propellant as is known in the art. Fluid communication is formed between the fuel cell and the valve. In the preferred embodiment, a mechanically operated valve is used, such as the valves currently available in the IMPULSE® tool sold by ITW Paslode. In other embodiments, an electromagnetic solenoid type fuel metering valve may be used.

Referring to the main chamber 14, a cylinder head 34 is located at the combustion end 30 of the main chamber, forms the upper end of the combustion chamber, and has an attachment point for a head switch 38 (shown in dotted lines). , An ignition plug 40, an electric fan motor 42, and a sealing O-ring 44.

A main or combustion chamber fan 46 is attached to the armature or power shaft 48 of the motor 42 at a first end 50 of the armature. The fan 46 is connected to the combustion chamber 3
6 and rotates in the axial direction, so that the fan 46
Enhances the combustion stroke by mixing fuel and air, further promoting cooling and scavenging. Fan motor 42
Is controlled by a head switch 38, as disclosed in more detail in prior patents incorporated by reference. The fan 46 functions as a main airflow enhancer to increase the airflow in the combustion chamber 36.

A substantially cylindrical reciprocating valve member or valve sleeve 52
Is moved within the main chamber 14 by a workpiece contact element 54 slidably mounted outside the nosepiece 26 using a link 56. The side wall of the combustion chamber 36 is formed by the valve member 52. The upper end of the valve member 52 sealingly engages the O-ring 44 to seal the upper end of the combustion chamber. The lower portion 58 of the valve member 52 surrounds a substantially cylindrical body 60. The valve member 5 is provided at the upper end of the cylindrical body 60.
An outer O-ring 62 is provided which engages the second counterpart 64 to seal the lower end of the combustion chamber 36.

A piston 66 is reciprocally disposed within the tubular body 60 and a rigid elongated driver rod 67 used to drive a fastener 68 (hidden in FIG. 1) is attached to the piston 66. Attached, the driver rod 67 is fed from the magazine 22 and is appropriately positioned within the nosepiece 26 in the workpiece. When the trigger 69 is pulled, a signal is issued from the central electrical distribution control device (not shown), and the ignition plug 4
A discharge occurs in the zero spark gap, which ignites the fuel that has been injected into the combustion chamber 36 and has been evaporated or shredded by the fan. In response, the piston 66 is driven toward the lower end of the cylinder 60. As the piston 66 approaches the lower end, the driver rod 67 is guided into the nosepiece 26 and impacts the fastener 68 held above the workpiece by the nosepiece.

If the nosepiece 26 is not pressed against the workpiece to regulate the use of fuel, the tool 1
0 does not burn. Such an arrangement causes the link 56 to be pushed upward, thereby moving the valve member 52 to seal the combustion chamber 36 and moving a link (not shown) for operating a mechanical fuel valve. . Details regarding the seal of the combustion chamber 36 and associated mechanisms are disclosed in the aforementioned Nikolich patent incorporated by reference.

The lower end of the tubular body 60 forms a seat 70 for a shock absorber 71, which forms the lower limit of movement of the piston 66. At the opposite end of the tube 60, a piston stop ring 72 is provided to limit the upward movement of the piston 66.

Referring now to FIG. 2, the shield 73 of the preferred embodiment of the present invention protects the nosepiece 26 with corresponding components. The retaining ring 75 is secured at the tool end 74 of the nosepiece 26 to the lower end 28 of the power source 16 by at least one screw 76 or other threaded fastener. The nosepiece 26 includes a pair of front guide members 7 arranged below the retaining ring 75.
8 and a rear guide member 79. In the preferred embodiment, the rear guide member 79 is actually the front of the magazine 22. A semicircular groove is formed on an engagement surface (not shown) of the front guide member 78 and the rear guide member 79. During assembly of the nosepiece 26, the semicircular groove of the engagement surface has a cross-sectional shape corresponding to the cross-sectional shape of the drive rod 67 and the fastener 68 to guide the drive rod and the fastener, and And a guide passage (not shown) coaxial with the fastener 68.

The fastener 68 is guided to the workpiece through a guide passage, and the fastener is located at the workpiece end 80 of the nosepiece 26. The rear end of the semicircular groove of the rear guide member 79 forms a cutout (not shown) for receiving the fastener 68 from the magazine 22. The nose piece 26 is provided on the front surface 81 of the front guide member 78.
And a work contact element 54 extending substantially vertically in a substantially parallel relationship with the workpiece. The lower end 82 of the link 56 is secured to the workpiece contact element 54 by a drive adjustment screw 84 of at least one, and preferably two, depth. The screw 84 passes through a vertically extending slot 86 in the workpiece contact element 54. By temporarily loosening the screw 84, the relative vertical position of the element 54 and the link 82 can be implemented in a manner known in the art. Further details of the nosepiece device are disclosed by U.S. Patent No. 5,687,899, which is hereby incorporated by reference.

Referring now to FIGS. 3 and 4, the shield 73 has an upper end 88 and a lower end 90 and is generally tubular in shape and is formed to surround the nosepiece 26. The shield 73 is preferably a durable structure, for example, 16 gauge 1050 cold rolled steel (16 gauge 1050).
50 cold rolled steel). The use of other equally manufactured materials or metals is also conceivable.
The retaining ring 75 is fixed to the upper end 88 of the shield 73 and is configured to be attached to the lower end 28 of the power source 16. When the nosepiece 26 is pressed longitudinally against the workpiece and the workpiece contacting element 54 is fully contracted, the lower end 90 of the shield 73 is in a position substantially flush with the workpiece. 73 are configured. The longitudinal peripheral wall 92 of the shield 73 extends from the upper end 88 to the lower end 9 so as to form a substantially hollow inverted conical shape.
Slant to zero. With this inverted conical shape, the nosepiece 26 is housed, and the workpiece contact element 54 and the link 82
The workpiece can be seen well by the movement of the screw 84.

In particular, the retaining ring 75, a component of the previous tool 10, has a substantially cylindrical shape with a notch 75a formed in the cylinder to accommodate a portion of the nosepiece 26 and the drive rod 67. It has a shape. Further, the retaining ring 75 has a hole 91 for receiving a screw 76 for attaching the retaining ring 75 to the lower end 28 of the power source 16. Hold ring 75 for shield 73
The shield 73 is preferably welded (joined) along the upper end 88 to at least 75% of the circumference of the retaining ring 75 to secure the shield ring. Alternatively, shield 73 can be formed in one piece by stamping or casting, or can be cast in a die-cast housing,
It can be a part of the main body.

To protect the four sides of nosepiece 26 (best seen in FIG. 2), shield 73 is
Configured and arranged to protect at least three of the sides,
The fourth side surface is abutted and engaged by the fastener magazine 22. Edge 92a, 92 facing rearward of wall 92
“b” forms a space for accommodating the magazine 22.

As shown in FIG. 5, at least one (preferably three) operating opening 94 in the shield 73 is provided for operating a drive adjustment screw 84 on the nosepiece 26. . Each operating opening 94 is configured and arranged such that only one of the drive adjustment screws 84 can be operated at a time. For example, nosepiece 26
Can be operated while the nosepiece 26 is in the retracted position, such as occurs when the tool is pressed against the workpiece, while the nosepiece 26 is in the retracted position. The other can be operated. The same nosepiece shield 73 is used for various tools 1
A plurality of operating apertures 94 are provided so that they can be used on the zero. Further, the shield 73 is configured to form a cavity 95 between the nosepiece 26 and the shield 73 so as to enable drive adjustment.

FIG. 6 shows another embodiment of the present shield, indicated generally at 73a. Shields 73 and 73
Components shared with a are denoted by the same reference numerals. The shield 73a is formed to use a relatively small combustion type tool that is used to drive the fastener 68 into a more elaborate workpiece, such as during trimming. An opening 96 is provided in the shield for manipulating the nosepiece 26 depth adjustment. The notch 98 in the shield 73a provides a screw 99 for the fastener magazine 22 (shown in FIG. 1).
Can be operated. As in the case of shield 73, shield 73a has a substantially curved lower edge 100 which is processed for application when fastener 68 needs to be driven at a predetermined angle. The tool can be angled with respect to the material. It is contemplated that other such openings and cutouts 94, 96, 98 may be added as necessary to accommodate tools with various shapes of combustion power.

Referring now to FIGS. 7 and 8, a combustion powered tool for use with an alternative embodiment shield 73 is shown generally at 102. Tool 1
02 is similar in operation to the tool 10, and corresponding components are indicated by the same reference numerals. TRAK
Wood Dal under FAST®
e) The main distinguishing feature of the tool 102, which is preferably sold by the ITW Ramset / Red Head of the IL, is that the tool is a well-known specialized tool such as a pin. Fasteners drying wall truck 104
Specially shaped to drive through concrete, steel or other substrate material. Thus, a drywall track, essentially made of steel, in a "U" shaped passage with an open top, secures and supports a metal vertical wall support member or stud to the substrate. The drying wall truck may have a drying wall attached to the drying wall truck.

Accordingly, the tool 102 is provided with the nosepiece 1 configured to perform the same operation as the nosepiece 26.
06 and corresponding components including a tool end 74 and a work piece end 80, and
4 is specially formed to have a relatively small diameter such that it can be easily inserted into the open upper end. 8 and 11, the workpiece contact element 108 is specially shaped to fit within a relatively small work diameter, as described below. I have. To provide the tool 102 with the benefit of protecting the nosepiece shield 73, a modified shield is provided, which is indicated generally at 110.

Referring to FIG. 8 to FIG.
06 and a workpiece contact element 108 are protected from damage by a shield 110 having an upper end 112 and a lower end 114, and a generally tubular shape formed to surround the nosepiece 106. Shape. The shield 110 is preferably of a durable construction and may be manufactured, for example, from 16 gauge 1050 cold rolled steel. The use of other uniformly manufactured materials or metals is also conceivable. It is further contemplated that the shield 110 may be cast in a die-cast housing and be part of the main body.

The shield 110 is provided at its upper end 112 with a substantially flat flange 116 projecting radially inward. The flange 116 forms a central opening 118 (best seen in FIG. 8) configured to surround the upper end of the nosepiece 106. Further, flange 116 functions as a point for attaching shield 110 to lower end 28 of power source 16. An opening 120 (best seen in FIG. 8) is provided in the flange 116 for receiving a threaded fastener 76 or other type of fastener to secure the shield 110 to the tool 102.

The overall shape of the shield 110 is substantially conical with an upper portion 122 and a lower portion 124. The upper portion 122 slopes from a relatively wide point at the upper end portion 112 to a shoulder 126 that acts as a transition point between the upper portion 122 and the lower portion 124. The lower part is the upper part 122
The diameter is smaller than that of “necked down (reduced diameter) (n
ecked-down) shape and is generally cylindrical, with a lower interior 128 communicating with an interior 130 of the upper 122.

Referring now to FIG.
The zero rear opening 132 is formed by the rear edge 134 of the upper part 122, the shoulder 126, and the upper part of the lower part 124.
Regarding the configuration, the rear opening 132 is
(Most commonly seen in FIG. 7).

Referring now to FIGS. 8-10 and 12,
The operating opening 136 in the upper part 122 is opposite the rear opening 132. An operating aperture 136 is provided for operating the drive adjustment screw 84 on the nosepiece 106. In the preferred embodiment, the operating opening 136 is formed large enough to operate both adjustment screws, but the opening 1
It is envisioned that the shape and / or number of the 36 may be varied to suit the application.

Referring now to FIGS. 8 and 11, the upper end 122 is substantially spaced from the multiple nosepieces 106 and forms a cavity 95 between the shield and the nosepiece, such as the shield 73. , Lower end 1
24 is dimensioned to be small enough in diameter to be easily inserted into the open upper end of the drywall track 104 so that the pins are positioned exactly where needed. In addition, the lower end 124 is dimensioned so that the operator or user can easily see where the pin is being driven without unnecessary interference from the shield 110. Thus, the lower end 124 is preferably large enough in diameter to accommodate sliding movement of the workpiece contact element 108 with respect to the nosepiece 106 and to allow these components to operate freely and to be easily dried. It does not provide additional space that hinders the ability to insert the nosepiece 106 into a wall track.

Further, like the shield 73, the lower end portion 114 of the shield 110 is moved when the nosepiece 106 is pressed against the workpiece and the workpiece contact element 108 is completely contracted. It is configured to be located at a position that is substantially a plane position.

While a particular embodiment of the nosepiece shield of a combustion powered tool of the present invention has been shown and described, in a broader aspect, as set forth in the claims above, It will be understood by those skilled in the art that changes and modifications can be made to the present invention without departing from the invention.

[Brief description of the drawings]

FIG. 1 is a fragmentary side view of a combustion powered fastener tool having the present nosepiece shield, partially cut away for clarity.

FIG. 2 is a fragmentary side view of a combustion powered fastener tool having the nosepiece shield with the nosepiece shield disassembled, partially cut away for clarity.

FIG. 3 is an isolated side view of the nosepiece shield.

FIG. 4 is a separate top view of the nosepiece shield showing the retaining ring.

FIG. 5 is an isolated rear view of the nosepiece shield.

FIG. 6 is an exploded view of another embodiment of the present nosepiece shield.

FIG. 7 is a side view of a tool with combustion power suitable for use with another embodiment of the present nosepiece shield.

FIG. 8 is a front perspective view of the nosepiece shield of FIG. 7 shown assembled on a tool, with parts omitted for clarity;

FIG. 9 is a front perspective view of the nosepiece shield of FIG. 8;

FIG. 10 is a bottom view of the nosepiece shield of FIG. 8;

FIG. 11 is a cross-sectional view taken along line 11-11 of FIG. 10, generally in the direction shown.

FIG. 12 is a rear view of the nosepiece shield of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 12 ... Housing 14 ... Main chamber 16 ... Power source 22 ... Means for sending a fastener 26 ... Nosepiece 28 ... Lower end 30 ... Burning end 54 ... Workpiece contact element 67 ... Rod 73 ... Protective means 80 ... Workpiece end Part 95: cavity

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Mohammed K. Wagdi 60004, Illinois, United States, Arlington Heights, Kingsley Drive 818 (72) Inventor Wesima Yas 1-8-3, Senba Nishi, Minoh City, Osaka Prefecture

Claims (9)

[Claims] A housing having a main chamber; a power source surrounded by the main chamber having a combustion end and a lower end; a rod driven by a combustion end of the power source; and the rod. Means for continually sending fasteners to engage with; a tool end, a workpiece end opposite the tool, and depending from the lower end of the power source;
A nosepiece configured to receive the rod from the lower end of the power source and guide the rod toward a workpiece; and a workpiece slidably mounted on the nosepiece. A contact element, and protection means arranged and arranged to form a cavity between the nosepiece and the protection means, inclined from an upper end to a lower end, and protecting the nosepiece and the workpiece contact element. Tool with combustion power, with 2. The tool according to claim 1, wherein said fastener feeding means is a magazine. 3. When the workpiece contact element contracts when the tool is pressed on the workpiece, and when the tool is pressed on the workpiece and the workpiece contact element is contracted. 2. The tool according to claim 1, wherein the protection means is located substantially in a plane with the workpiece. 4. The tool according to claim 1, wherein the protection means is substantially conical shaped to surround the nosepiece. 5. The tool according to claim 1, wherein the protection means has an upper part and a lower part, and the lower part is substantially cylindrical. 6. The tool according to claim 5, wherein the lower portion has a diameter just large enough to allow the sliding action of the nosepiece and the workpiece contact element. 7. The tool according to claim 1, wherein the protection means has an upper end and a lower end, and the upper end is formed so as to be fixed to a front lower end of the power source. 8. The tool according to claim 1, further comprising at least one operating opening in the protective means for operating at least one depth drive adjustment on the nosepiece. 9. The work piece end of the nosepiece in a position where the protection means has a lower end, and the lower end is completely contracted when the tool is pressed against the work piece. The tool according to claim 1, wherein the tool is located substantially in a plane with the part.