JPH11262873A - Fastener tacker with launching safety function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent a tacking action from being carelessly performed, even if a tacker leaps up from an object, by providing an elastic means deforming by a length of a prescribed path when a contact filler idly moves and operates on a transmission path between the contact filler and a switch device. SOLUTION: A muzzle part 16 is provided by projecting a contact filler 54 downward at an idle location in parallel to a tacking groove 15. In the contact filler 54, a rising part 55 is adjacent to a housing head 2 and extends in parallel to the tacking groove 15. The rising part 55 directs in the direction of a shaft 47 which is pivotally supported by a launching lever 48, a compression spring 57 of an elastic means is supported on a hook 56, and the other end of the compression spring 57 acts on a shaft body 58 that an oblong hole 59 of a housing 1 and an oblong hole 60 of the rising part 55 guide. A right angle bending part at one end 52 of a bridge 51 which is pivotally supported by a shaft 50 of the launching lever 48 is supported on the upper side of the shaft body 58. Even if a tacker is not arranged on an object and the launching lever 48 is operated, a tacking action is not performed.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION
The present invention relates to a fastener tucker with a launch safety feature as described in the preamble of claim 1 of the claims.

[0002]

BACKGROUND OF THE INVENTION Tuckers of the present invention serve to drive fasteners, such as nails and staples, into an object, and are generally operated pneumatically.
In this tucker, the tacking plunger is supported by a piston in a cylinder, and the cylinder is rapidly filled with pressurized air from a source of pressurized air by a switch valve to fire a fastener. A fire safety device serves to prevent inadvertent fastener firing, for example, when a tucker is lifted from an object or at risk of injury.

[0003] In known tuckers, there are various ways in which the firing safety device and the firing device cooperate, and the fastener firing is performed, for example, by activating the firing device with a finger while the firing safety device is applied and activated. Performed, or
It is performed by applying the launch safety device to an object while the launch device is operated. The launch via the launch safety device is also called “contact release” or “touching”.

[0004] In the case of a contact firing type tucker in which the tucker jumps up from an object due to a recoil of the tacking operation, two fasteners may be driven into the same place. Since the recoil of the tacking operation is caused particularly by the movement of the driving piston during the tacking operation and the ejection of the fastener, conventionally, the launching device firmly holds the launching safety device, and after the tucker has jumped up, the target object is again returned. There is one that causes the next launch to occur when it comes into contact with.

[0005] German Patent DE 9305760 discloses a tucker having the form described in the preamble of claim 1 of the present application, in which the locking means provided on the touch means is moved to the operating position of the valve rod. Locks the touch means at the time of actuation of the valve, and unlocks the touch means at the time of release of the valve rod. At this time, if the operation of the firing device leads to a tacking operation, the touch means is held in the operating position until the firing device preparing for the next tacking operation is released again. Thereby, the free switching lever end remains on the contact surface of the touch slider, and at the same time further firing is only possible when the touch means is activated. This configuration is only compatible with single release tuckers.
In this case, it is necessary to activate the contact feeler first, and tacking can be performed by subsequently activating the firing device.However, even if the operation procedure is reversed and the contact feeler is activated or released, tacking is not performed. I can't. However, depending on the type of the tucker, it may be desirable to perform the tacking by operating the touch means (touching operation) after the firing operation.

Further, there is also a tucker provided with an automatic switch valve which strikes a fastener at a settable frequency (frequency, for example, 30 Hz). In this type of tucker, the launch safety device cannot be restrained by the launch device.
The reason is that this type of tucker, unlike other tuckers, continues to launch after being lifted from the target. That is, the launching device and the launch safety device perform the tacking action equally. However, since the tucker jumps up due to the recoil of the tacking action, the next firing is performed by the firing safety device at the time of re-contact with the target object, so that the number of times of hitting may be higher than the preset hitting frequency.

[0007]

SUMMARY OF THE INVENTION In view of the above situation, it is an object of the present invention to provide a fastener tacker with a fire safety function, and even if the tucker jumps from an object, the tacking action is not performed carelessly. The point is to provide things. This object is achieved by the features of claim 1. Useful configurations are described in the respective dependent claims.

[0008]

According to the present invention, a tacking plunger is driven by a drive unit. Preferably, the pneumatic drive unit is provided with a drive piston arranged in the cylinder for driving the tacking plunger. The tacking plunger strikes the fastener through the muzzle. For this purpose, a magazine is preferably mounted on the side of the muzzle, from which a fastener is guided into a tacking groove in the muzzle and the tacking plunger is displaced by a drive unit in the muzzle.

Further, there is provided a switch device for operating a drive unit having a firing device which can be operated from the outside. This switch device may have a pneumatic switch valve structure. The firing device also includes a firing lever that cooperates with a valve pin of the switch valve device.

Further, a contact feeler as a launch safety device which is activated by contact with an object is movably attached to the muzzle portion, and projects from the muzzle portion at an idle position. A transmission cooperating at one end with the contact feeler and cooperating with the switch device at the other end prevents firing of the drive unit when the contact feeler is in the idle position. The transmission device also allows firing of the drive unit when actuation causes the contact feeler to move from the idle position to some extent idlely moving from the idle position to an effective position where firing of the drive unit is allowed. .

Further, the transmission device includes elastic means for deforming by a predetermined path length when the contact feeler operates more than the idle movement in a transmission path or a flow of force between the contact feeler and the switch device. I have.
The elastic means may be formed by a compression spring which is biased in the direction of movement of the contact feeler, one end of which is supported by the contact feeler, and the other end of which is cooperated with the switch device. The dimension of the path length of the elastic deformation of the elastic means is determined by the fact that the elastic means holds the active position on the switch device at which one end of the transmission device cooperating with the switch device is allowed to fire the drive unit. ) Dimensions to compensate for the partial backward movement of the contact feeler in the direction of the idle position caused by the tucker bouncing off the object due to elastic return deformation.

When the tucker jumps up from the object in reaction, the contact feeler actually retreats a little in the direction of the idle position by its own weight or by pretension by the spring means. Thereby, the elastic means is again deformed to be larger or smaller. However, the transmission end cooperating with the switch device remains in the active position, allowing the firing of the drive unit. As a result, the movement of the contact feeler when the tucker jumps up does not affect the switch device, and the tacking action does not occur even if the tucker is brought into contact with the object again. In the case of a tucker with an automatic switching device, that means that the desired firing frequency is maintained. Similarly, European EP0326639B
An automatic switch device as described in JP-A No. 1 or EP 0600202B1 may be applied. In the case of a tucker equipped with a contact firing device, when the above-described automatic switch device is installed, the fastener is activated by a specified method such as lifting the tucker beyond the path length of the elastic means. Only will be launched. Therefore, an inadvertent tacking action based on the reaction force can be reliably prevented.

Preferably, a firing lever is used as the firing device. The firing lever has one end attached to the tucker housing and the other end attached to a bridge. The other end of the elastic means acts on the other end of the bridge. The resilient means, at the end cooperating with the switch device, acts on a shaft guided movably in a slot in the direction of movement of the contact feeler. The other end of the bridge acts on the shaft. Further, the bridge is provided with a valve pin in the switch device,
The bridge is rotated by the elastic means in the direction of the valve pin when the contact feeler operates. With this arrangement, the bridge does not activate the valve pin when the contact feeler is inactive, depending on whether the tucker is on the object or jumps off the object.

Further, since the contact feeler can perform a short idle movement (for example, 3 mm), the tacking operation is not performed carelessly due to the contact of the launch safety device.

In order to be able to set the firing energy,
The tucker may further be provided with a settable distance holder.
This settable distance holder protrudes from the muzzle,
Preferably, it comprises a roller for moving the tucker on the object. Therefore, in this case, unlike the prior art in which the firing energy is changed by changing the degree of protrusion from the muzzle portion of the contact feeler, in the present invention, it is avoided that the weight of the tucker is supported via the contact feeler. . As a result, more advantageous sizing can be performed, and a reliable design can be achieved in terms of operation. Further aspects and advantages of the present invention will become more apparent from the following description of embodiments, which proceeds through the accompanying drawings.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The tucker of the present invention has a housing (1), and the housing (1) includes a housing head (2), a housing cap (3), and a housing grip (4).

An operating cylinder (5) provided on the housing head (2) is provided with a working piston (6) in an airtight manner. A plurality of first openings (7) are provided in the outer peripheral portion of the lower portion of the operation cylinder (5), and the first openings are sealed with an elastic O-ring (8) provided on the outer surface of the operation cylinder (5). The operating cylinder (5) has a second opening (9) at the outer peripheral portion below the opening (7). The opening (7)
(9) communicates with an airtight piston recovery chamber (10) surrounding about two thirds of the lower part of the operation cylinder (5).

The lower part of the operating cylinder (5) is further provided with an elastic abutment (11) for the working piston (6). Said abutment (11) is held in a tool carrier (12) closing the bottom of the housing head (2).

A tacking plunger (13) is connected below the working piston (6). The lower part of the tacking plunger (13) is provided with a muzzle part (1) by a seal (14) of a tool carrier (12).
6) are guided to the tacking groove (15). A magazine (17) containing fasteners such as staples is attached to the side of the muzzle (16),
It is connected to the tacking groove (15) through the opening.

The housing grip (4) and the magazine (17) are cut off on the right side in the figure.
The cut portions are connected to each other by a bridge body. The housing grip (4) also has a connection to a source of pressurized air at this point.

A valve piston (19) is provided in the valve space (18) of the housing cap (3) in an airtight manner, and is supported in an airtight manner by an O-ring (20) at the upper edge of the operation cylinder (5). . The hole (21) connects the seat of the O-ring (20) to the upper surface of the valve piston (19). Further, a sleeve-shaped protrusion (22) extends above the valve piston (19), and a central air passage (23) is formed therein. The protrusion (22) is provided on a support plate (24).
The support plate (24) is hermetically fixed in the housing cap (3) in a circumferential direction above the valve piston (19) in a central through hole. A compression spring (25) is attached between the valve piston (19) and the support plate (24).

A ventilation space (26) is formed above the support plate (24) of the housing cap (3). An elastic sealing body (27) is fixed at a central portion of the ventilation space above the protruding portion (22), and a muffling ring (28) is provided. This ring (28)
The air from the ventilation space (26) enters the ventilation channel (29) leading to the outside.

A pressurized air supply space (30) is formed in the housing grip (4). Valve pin (3
1) crosses the pressurized air supply space (30), and the upper part of the valve pin (31) is provided with the housing cap (3).
Is guided in a sleeve (32) which is held in an airtight manner in a hole (33). The lower portion of the valve pin (31) is guided in a gas-tight manner into the hole (34) of the housing grip (4), and the lower end (35) projects somewhat from the hole (34).

On the valve pin (31), a compression spring (36) is supported at one end by the sleeve (32) and at the other end by a shoulder (37). 31) is urged in the direction of the hole (34). The valve pin (31) is supported on the upper edge of the hole (34) by the second shoulder (38).

The valve pin (31) has a reduced diameter portion (39) at the upper part, and seal rings (40) (41) are attached to both ends of the reduced diameter portion. Valve pin (3
When 1) is in the position of FIG. 1, the seal rings (40) (4)
1) Both are located on the working surface of the sleeve (32).
A plurality of through-holes (42) are provided in the lower circumferential direction of the sleeve (32), and these through-holes connect the pressurized air supply space (30) to the inside of the sleeve (32).
At the position (1), it leads to the reduced diameter portion (39) of the valve pin (31). Also, a plurality of through holes (43) are formed in the circumferential direction substantially at the center of the sleeve (32).
In all the switching positions of the valve pin (31), the valve pin (31) is connected to the reduced diameter portion (39).
1) is connected via an annular groove (44) on the outer periphery of the sleeve (32) to a channel (45) leading to the valve space (18) between the support plate (24) and the valve piston (19). . Above the sleeve (32) in the housing cap (3), there is a vent hole (46) leading to the outside.

The firing lever (48) is pivotally supported by a shaft (47) provided below the housing grip (4) connected to the housing head (2). The firing lever (48) has a channel (49) that opens in the direction of the housing grip (4) and has an axis (5) in said channel.
0), that is, the bridge (51) is pivotally supported at the end opposite to the shaft (47). The bridge (5
1) has one end (52) bent at a right angle, and the shaft (4)
7) Opening (53) of firing lever (48) located below
And the lower end (35) of the valve pin (31) is arranged substantially at the center of the bridge (51).

The muzzle portion (16) is provided with a contact feeler (54) in parallel with the tacking groove (15). The contact feeler (54) is urged by a spring element (not shown) to be in the idle position. It protrudes downward from the muzzle (16). In this contact feeler (54), the upper end of the part guided to the muzzle portion has a tool carrier (1).
2) Below, it extends perpendicularly to the tacking groove (15), from which a riser (55) extends parallel to the tacking groove adjacent to the housing head (2). The rising portion (55) in the contact feeler
The compression spring (57) is supported on the hook (56) in the direction of the shaft (47), and the other end of the compression spring (57) is connected to the elongated hole (59) of the housing (1) and the rising portion ( 55) a shaft (58) guided in a slot (60);
To act on. Further, a right-angle bent portion at one end (52) of the bridge (51) is supported above the shaft body (58). Thereby, the contact feeler (5
4) The shaft body (5) at the rising portion (55).
8) is guided to each of the long holes, and at the idle position shown in FIG.
0) is pressed to the upper end (61).

The operation of the tucker of the present invention is as follows. If the tucker with the muzzle (16) is not placed on the object, the contact feeler (54)
Position. In this state, the firing lever (48)
When actuating the bridge (51), the firing pin (31)
And the tacking action is not performed.

The reason why the tacking action is not performed is that the pressurized air advances from the pressurized air supply space (30) through the hole (42) along the reduced diameter portion (39), and passes through the through hole (43) and the annular groove (43). 44), the valve space (1) via the channel (45).
8) and acts on the entire upper surface of the valve piston (19).

Since the pressurized air acts only on the portion of the lower surface of the valve piston (19) extending laterally from the operation cylinder (5), the force acting on the upper surface of the valve piston (19) is smaller. , Greater than the force on the lower surface. As a result, the valve piston (19) remains at the position shown in FIG.
Sealing the operating cylinder (5) with the ring (20). Therefore, the pressurized air from the pressurized air supply space (30) does not drive the operating piston (6). Therefore, when the muzzle part (16) is not arranged on the target, it is impossible to perform the tacking operation even if the firing device is operated.

On the other hand, when the muzzle portion (16) is arranged on the object, the contact feeler (54) is moved by the muzzle portion (1).
6) Move until it is flush with the lower end face. At the same time, the rising part (55) of the contact feeler is hooked (5).
6), the compression spring 57 pushes the shaft body (58) up along the elongated hole (59). This raises the right-angled bent end of the bridge (51). In this state, when the firing lever (48) is pulled,
The bridge (51) presses the lower end (35) of the firing pin (31), displacing the valve pin (31) in the sleeve (32) as shown in FIG. Thereby, a tacking action is performed as described below.

The displacement of the valve pin (31) causes the seal ring (40) to pass over the through-hole (42) and reduce the diameter of the pressurized air (39) from the pressurized air supply space (30) and the valve space (18). The passage to is blocked. At the same time, the seal ring (41) is pushed up together with the valve pin (31) and projects from the sleeve (32). As a result, the pressurized air in the valve space (18) passes through the channel (4).
5) It passes through the annular groove (44) and the through hole (43), rises along the reduced diameter portion (39), flows out of the sleeve (32), and passes through the ventilation hole (46) to the outside air. As a result, the pressure on the upper surface of the valve piston (19) is released, and is pushed up by the pressurized air acting on the lower edge, so that the projection (22) of the valve piston (19) is sealed.
7) is brought into an airtight engagement state. And the hole (2
1) O-ring (20) of the valve piston (19)
From the cylinder (5) to the valve piston (19) make sure that the lower pressure is not higher than the pressure in front of the O-ring (20).
Is prevented by leakage when lifting the
The ring (20) comes out of the groove of the valve piston (19). The hole (21) allows air to flow out of the space behind the O-ring and the valve space (18) as the valve piston (19) rises.

The valve piston (19) and the O-ring (2)
By lifting the operation cylinder (5) from the operation cylinder (5), the pressurized air flows into the operation cylinder (5) from the pressurized air supply space (30) rapidly over the upper end, and the working piston (6) is brought into contact with the operation piston (6). Push down on body (11) until it stops. At the same time, the tacking plunger (13) drives the fastener from the tacking groove (15) to the object.

With the working piston (6) abutting against the bottom of the cylinder (5), pressurized air through the first opening (7) slightly expands the O-ring (8) and causes the piston recovery chamber (10). ), Where it is stored. This state is shown in FIG. In this state, the firing lever (4
8), the spring (36) presses the valve pin (31), and the lower end (35) of the valve pin pushes the firing lever (48).
Is returned to the initial position in FIG. 1 irrespective of whether or not the muzzle part (16) is arranged on the target. As a result, the connection of the valve space (18) to the outside air is cut off, and
It is connected to the pressurized air supply space (30). This allows
The valve pin (19) is pushed down to the sealing position for the operation cylinder (5), and the airtightness between the protrusion (22) and the elastic seal body (27) is released. Then, the air above the working piston (6) of the operating cylinder (5) flows into the ventilation space (26) through the central air passage (23), and further, the mute ring (28) and the ventilation channel (29).
Through to the outside air.

The pressurized air collected in the piston recovery chamber (10) passes through the second opening (9), and the working piston (6).
It flows downward and pushes the working piston (6) back to the top end position, whereby the working piston (6) pushes the upper pressurized air through the vent. The preparation for the next tacking action is now ready, and tacking by actuation of the firing lever (48) becomes possible.

When the tucker is lifted from the object while the firing lever (48) is operated from the state shown in FIG. 2 and the contact feeler (54) is set to the idle position,
The bridge (51) rotates downward so as to return to the initial position in FIG. 1 by the valve pin (31). As a result, the state is the same as when the firing lever (48) is not pulled, the operating piston (6) returns to the top end position, and the preparation for the next tacking operation is completed. In this state, tacking is possible only by placing the contact feeler (54) on the object.

When the working piston is lowered, the tucker reacts and jumps up from the target. If a jump occurs, the contact feeler (54) slightly exits the muzzle but does not reach the idle position. This state is shown in FIG.

In the position of FIG. 3, the compression piston (57) holds the bridge (51) firmly in its angular position, so that the valve piston (31) remains retracted, so that the working piston (6) is at the bottom. Stay at the end point. Therefore, preparations for the next tacking are not completed. In this state, even if the contact feeler (54) comes into contact with the object again, the contact feeler (54) is pushed back to the position shown in FIG. 2 and tacking does not occur.

In this case, in order to perform tacking, it is necessary to first return the firing lever (48) or lift the tucker from the object, and bring the contact feeler (54) to the position shown in FIG.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of a tucker of the present invention in which a contact feeler and a launching device are both inactive.

FIG. 2 is a longitudinal sectional view similar to FIG. 1 of the tucker of the present invention with the contact feeler and the launching device in operation.

FIG. 3 is a longitudinal sectional view similar to the above of the tucker of the present invention with the contact feeler retracted somewhat and the firing device in an activated state.

[Explanation of symbols]

 Reference Signs List 1 housing 6 working piston 13 tacking plunger 16 muzzle part 31 valve pin 48 firing lever 51 bridge 54 contact feeler

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Joachim Bauer, 13210 Hugo Kremstraße, Day 21075 Hamburg, Germany

Claims (8)

[Claims] 1. A fastener tacker with a launch safety function, comprising: a tacking plunger driven by a drive unit and capable of firing fasteners from a muzzle portion; and a launching device operable from outside. A switch device for actuation, and a contact feeler that can be actuated by being arranged on the object, movably guided along the muzzle portion, protruding from the muzzle portion at an idle position, and the contact feeler at one end portion. Cooperates with the switch device at the other end, prevents firing of the drive unit when the contact feeler is in the idle position, and cooperates with the switch device from the idle position by actuation of the contact feeler. Firing of the drive unit when the end moves to some extent to an active position where the drive unit is allowed to fire A transmission device that enables the transmission device to elastically deform according to the length of the path when the contact feeler operates beyond the idle movement in a transmission path between the contact feeler and the switch device. Elastic means, wherein the path length is a length that compensates for partial backward movement of the contact feeler in the idle position direction due to the tucker jumping up from the object due to elastic return deformation of the elastic means, One end of the transmission device cooperating with the switching device holds an active position on the switching device, thereby permitting firing of the drive unit by actuation of the firing device. 2. A tucker according to claim 1, wherein said elastic means is directed in a moving direction of said contact feeler, and one end is supported by said contact feeler and the other end is a compression spring cooperating with said switch device. What formed. 3. The tucker according to claim 1, wherein the transmission device has a guide body that runs in a direction in which the contact feeler is guided at one end where the transmission device cooperates with the switch device. 4. The tucker according to claim 1, wherein the firing device is formed by a firing lever having one end attached to a housing of the tucker and a bridge attached to the other end. The other end of the elastic means acts on the end by support, and the valve pin of the switch device is disposed on the bridge, and the bridge is rotated by the elastic means when the contact feeler is operated in the valve pin direction. Accordingly, when the contact feeler is not operated, the bridge does not operate the valve pin in response to the operation of the firing lever.On the other hand, when the contact feeler is operated, the bridge is lifted by the elastic means, and the tucker is placed on the object. Independently of the launch lever, whether it is located or jumping from the object The valve pin is held for the operation of the valve. 5. The tucker according to claim 3, wherein the other end of the elastic element acts on a shaft that is movably guided by an elongated hole that forms a guide, and that the bridge element has a shape that is smaller than that of the bridge. The other end is engaged with the shaft. 6. A tucker according to claim 1, wherein the contact feeler is pre-tensioned in the direction of the idle position by a spring means supported by the tucker housing. 7. The tucker according to claim 1, comprising an automatic switch device.
Ability to strike fasteners at a constant or adjustable frequency. 8. A tucker according to claim 1, comprising a firing switch device, whereby the fired fastener is driven out by the arrangement of the contact feeler on the object. Something like that.