JP3843156B2 - Rechargeable torque wrench - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention incorporates an electric motor driven by a rechargeable battery as a power source, and can perform screw tightening with the battery, can improve the consumption economy of the battery, and further can be used at the time of screw tightening work. The present invention relates to a rechargeable torque wrench that can effectively prevent overtorque.
[0002]
[Prior art]
There are things as conventional nut runner over a torque wrench to be used for tightening of screws, etc. various, there is disclosed for example real Examined Publication No. 49-38640, or in Kokoku No. 5-175452.
[0003]
[Problems to be solved by the invention]
Since any of the above torque wrenches with nut runners uses pressure air as the power source, it is necessary to connect air hoses to these torque wrenches, which causes significant screw tightening work. It was damaged and lacked workability.
[0004]
In the case of a torque wrench that uses a nut runner, the drive mechanism of the nut runner is stopped by shutting off the power source to the nut runner by the toggle link mechanism that operates when the screw tightening force reaches a predetermined torque. However, in the output shaft of a nut runner that uses a power source such as air, there is a problem that even if the power source is shut off, inertia inertia occurs and this inertia tends to generate overtorque. It was.
[0005]
In addition, in a conventional torque wrench with a nut runner, the operator confirms that the screw has been tightened at a predetermined torque value as if it was transmitted to the operator. There are also drawbacks such as that it is difficult to confirm by other persons, and to perform the tightening management of each fastening screw, and the reliability of screw tightening is low.
[0006]
The present invention has been made in view of the take, the output shaft driven by the rechargeable power force, as inertial force after power shutdown does not occur, the over-torque due to the inertia of the drive shaft occurs the was prevented, and the purpose is to increase the clamping accuracy of the screw.
[0007]
Another object of the present invention is to provide a micro switch for power shutoff interlocking with the operation of the toggle link mechanism so that the power supply to the motor is immediately shut off at the same time as the toggle link mechanism is operated, so Ru near to enhance the economy.
[0008]
[Means for Solving the Problems]
The rechargeable torque wrench that achieves the object of the present invention has a rechargeable battery on the tail end side of the handle member, and a vertical axis direction perpendicular to the length direction of the handle member. A toggle mechanism that pivotally supports the head member at the tip of the handle member in a pivotal direction and relatively swings the head member and the handle member by a toggle operation when a set torque value is exceeded. A handle portion having,
The output of an electric motor powered by the rechargeable battery is driven through a case fixed to the head member and a planetary gear mechanism housed in the case with an axis along the vertical axis direction. A ring gear having a clutch pawl provided on the outer periphery of the planetary gear mechanism is rotatably supported with respect to the case, and is engaged with the clutch pawl by a clutch piece that moves in the vertical axis direction. And a drive unit that is disengaged, and a link that is disposed in the upper part of the case and tilted in the vertical axis direction by the handle member that swings relative to the head member by a toggle operation of the toggle mechanism. by tilting the vertical axis of the link is movable along the inside of the casing in the vertical direction, with a, a stopper rod in which the clutch piece is fixed And wherein the door.
[0009]
According to another aspect of the present invention, there is provided a rechargeable torque wrench according to claim 2 , wherein the clutch piece is moved to the electric motor by movement of the clutch piece in the vertical axis direction. The present invention is characterized in that a micro switch for cutting off the power supply is provided .
[0010]
Each of the above-described components can be equipped with an FM transmitter that transmits a screw fastening completion signal to the torque wrench.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.
[0012]
1 Ru handle member der tubular torque wrench. As shown in FIG. 1, a grip member 28 is attached to the rear portion of the handle member 1, and a rear end portion 2 a of the head member 2 is inserted from a front end side opening 1 a of the handle member 1. The head member 2 is swingably supported by the handle member 1 via a support shaft 29 attached in a direction (vertical axis direction) orthogonal to the length direction of the handle member 1. A recess 6a into which the tip 2b of the head member 2 is fitted is formed on the upper portion of the case 6 to be described later, and screwing is performed with the tip 2b of the head member 2 fitted into the recess 6a of the case 6. Is done. Further, the cover member 4 is attached to the case 6 from above with screws.
The handle member 1 is maintained in a locked state in which the swing of the head member 2 is prevented until the set tightening torque value is reached, and the head member 2 is held integrally with the handle member 1. However, a toggle link mechanism 16 having a well-known structure for releasing the locked state of the head member 2 when a set tightening torque value is exceeded is provided .
The toggle link mechanism 16 can move straight in the rear end 2c formed on the inclined surface of the rear end 2a of the head member 2 and the handle member 1, and is disposed behind the rear end 2a. The first member 16a, the second member 16b for connecting the first member 16a and the rear end 2c, and a toggle (not shown) for biasing the first member 16a toward the head member 2 side. It is composed of a spring.
When the toggle link mechanism 16 shown in FIG. 5 is in the locked state, the second member 16b is located between the first member 16a and the rear end 2c of the head member 2 with respect to the length direction of the handle member 1. Located diagonally. If the screws are tightened manually in this state, the handle member 1 is gripped and tightened clockwise. When the first member 16a starts moving backward while compressing the toggle spring as the tightening force increases, the head member 2 is pivoted following the second member 16b being pulled backward. When the second member 16b rotates beyond the position parallel to the longitudinal axis of the handle member 1, the head member 2 is moved relative to the handle member 1. It suddenly rotates and the so-called toggle is activated. In the present invention, since the screw is tightened by the motor, the above-described toggle operation is performed by the reaction force accompanying the screw tightening applied to the head member 2.
As shown in FIG. 1, an FM transmitter 3 is attached to the outside of the distal end portion 1 b of the handle member 1, and the FM transmitter 3 is protected by a cover 4. Reference numeral 5 denotes a rechargeable battery that is detachably attached to the tail end of the handle member 1.
[0013]
Reference numeral 6 denotes a case fixed integrally with the head member 2 at the tip of the handle member 1. The case 6 includes an electric motor 7 using the rechargeable battery 6 as a power source, The drive shaft 8 of the electric motor 7 is connected to a primary planetary speed reduction mechanism 9 using a planetary gear mechanism, and the output side of the primary planetary speed reduction mechanism 9 is connected to a secondary planetary speed reduction mechanism using a planetary gear mechanism via a one-way clutch 10. 11 is coupled to the output side of the secondary planetary speed reduction mechanism 11 and an angular drive shaft 12 is coupled thereto.
The planetary reduction mechanism 9 has a plurality of planetary gears P meshing with the sun gear S around the sun gear S fixed to the input shaft IN, and ring gears 13 and 15 meshing with the planetary gears P on the outer periphery thereof. The output shaft OUT is rotated with the revolution of the support shaft A that rotatably supports a plurality of planetary gears P as a deceleration output. The output shaft OUT and the input shaft IN are on the same axis. It is arranged. When the ring gear 13 is in a freely rotatable state, the planetary gear P cannot rotate, and the ring gear 13 needs to be fixed to the case 6 in order to extract the deceleration output from the output shaft OUT. The planetary reduction mechanism 9 has a configuration in which a sun gear S and a planetary gear P are connected in two stages in series in one ring gear 13.
[0014]
A ring gear 13 of the primary planetary reduction mechanism 9 is rotatably held in the interior of the casing 6, on the outer surface of the ring gear 13, the clutch pawls 14 are projected, the inner peripheral portion of the case 6 A circumferential groove 6b is formed corresponding to the clutch pawl 14 to guarantee the rotation of the ring gear 13 . Incidentally, the ring gear 15 of the secondary planetary reduction mechanism 11 is integrally fixed to the casing 6.
[0015]
Reference numeral 17 denotes a front substantially L-shaped link (see FIGS. 7 and 8) that is pivotally supported by a support shaft 18 attached to the upper side of the case 6, and extends in the vertical axis direction of the link 17. The short portion 17 a is disposed close to the side surface of the distal end portion 1 b of the handle member 1 . A hole 17c is formed in the elongated portion 17b extending in the horizontal direction of the link 17, and one end of a stopper rod 19 extending in the vertical axis direction is passed through and engaged with the hole 17c . That is, when a horizontal force is applied to the short portion 17a of the link 17, the link 17 swings around the support shaft 18 and the stopper rod 19 engaged with the long portion 17b moves up and down.
The other end of the stopper rod 19 is provided with a clutch piece 20 that meshes with the clutch pawl 14. The clutch piece 20 is supported on the inner side of the case 6 so as to be movable along the circumferential direction of the ring gear 13 but movable in a direction parallel to the axial direction of the ring gear 13.
Furthermore, the clutch piece 20, the clutch piece 20, the repression action of the spring 21 which is interposed between the case 6, and is urged in a direction to mesh with the clutch pawls 14.
Therefore, when the stopper rod 19 moves upward against the spring force of the spring 21, the clutch piece 20 moves upward, the meshing with the clutch pawl 14 is released, and the ring gear 13 can be rotated. Further, when the stopper rod 19 is moved downward by the spring force of the spring 21, the clutch piece 20 is positioned in the turning locus of the clutch pawl 14, and the rotation of the ring gear 13 is prevented by the engagement with the clutch pawl 14. The clutch piece 2 is formed in a plate shape as shown in FIG. 2, one end is engaged with the clutch pawl 14, and the other end is fixed to the stopper rod 19.
[0016]
Reference numeral 22 denotes a microswitch for stopping the electric motor fixed in the case 6, and the operating piece 23 of the microswitch 22 is operated to follow the operation of the clutch piece 20. Reference numeral 24 denotes an electric motor starting switch. The electric motor starting switch 24 is provided with a switch operating knob 25, and the switch operating knob 25 is provided on a support shaft 27 provided on the handle member 1. Can be pushed by the trigger 26 supported by the shaft. Reference numeral 28 denotes a grip member attached to the outside of the handle member 1.
[0017]
The above is the embodiment of the present embodiment. Next, the operation will be described.
[0018]
As described above, the head member 2 that operates in association with the toggle link mechanism 16 supported inside the handle member 1 is supported at the distal end portion of the cylindrical handle member 1 to which the grip member 28 is attached. Although supported by a shaft 29, the head member 2 is integrally coupled to the case 6. Accordingly, the case 6 can be rotated about the support shaft 29 with respect to the handle member 1, and at this time, the short portion 17 a of the link 17 attached to the case 6 is moved horizontally by the tip end portion 1 b of the handle member 1. Will be pushed. For this reason, the stopper rod 19 that engages with the long portion 17 b of the link 17 moves upward to enable the ring gear 13 to rotate.
[0019]
Then, the rechargeable battery 5 is inserted into the grip member 28 and the trigger 26 is pulled, whereby the switch operation knob 25 is pushed, the start switch 24 is closed, and the electric motor 7 is driven.
The driving force of the electric motor 7 is transmitted to the angular drive 12 via the primary planetary speed reduction mechanism 9 and the secondary planetary speed reduction mechanism 11, whereby a screw tightening operation is performed.
Incidentally, the ring gear 13 in the primary planetary reduction mechanism 9 of this time, the clutch pawls 14 that are projected on the outer peripheral surface of the ring gear 13 is immovably supported in the inside case 6 in the circumferential direction of the ring gear 13 Since the clutch piece 20 is engaged with the clutch piece 20, the rotation of the ring gear 13 is prevented, and therefore the deceleration by the primary planetary reduction mechanism 9 is made effective.
[0020]
Then, the screwing proceeds, and reaches the predetermined tightening torque value, the tightening reaction force is transmitted to the head member 2 through the case 6, so that the toggle link mechanism 16 is operated. Since the case 6 by the clamping reaction force rotates about the support shaft 29 for supporting the head member 2, shorter part 17 a of the link 17 contacts the front end portion 1b of the handle member 1, the link 17 is 7 Tilt to the position shown in FIG. Therefore, the stopper rod 19 is pulled up against the elastic force of the spring 21 as shown in FIG.
[0021]
Thus, when the stopper rod 19 is pulled up, the clutch piece 20 supported by the stopper rod 19 is pulled up, and the operating piece 23 of the stop microswitch 22 is pushed up at the upper edge of the clutch piece 20, so that the stop As a result, the power supply to the electric motor 7 is cut off. At the same time, the engagement between the clutch piece 20 and the clutch pawl 14 is also released, so that the rotation preventing force of the ring gear 13 provided with the clutch pawl 14 is released, so that the ring gear 13 is freely rotated. Therefore, the inertial force inertia of the electric motor 7 is absorbed by the free rotation of the ring gear 13, and the inertial force by the electric motor 7 is not transmitted to the angular drive 12.
[0022]
Further, when the toggle link mechanism is operated, a screw tightening completion signal is transmitted from the FM transmitter, and the screw tightening completion signal is received by a predetermined receiver, so that screw tightening management for each screw tightening can be reliably performed. Is.
[0023]
【The invention's effect】
As described above, according to the rechargeable torque wrench of the present invention , when the screw tightening force reaches the set torque value, the ring gear in the planetary reduction mechanism can be idled by the action of the toggle link mechanism. The inertial force of the electric motor is not applied to the tightening screw, and the tightening screw can be fastened with an accurate set torque value.
[0024]
Also, when the tightening force of the screw to be tightened reaches the set torque value, the toggle switch mechanism activates the micro switch and the electric motor can be automatically stopped. Sexuality is enhanced.
[0025]
Further, since the fastening completion information is transmitted from the FM transmitter at the same time as the tightening of the tightened screw, the tightening management for each fastening screw can be easily and reliably performed.
[Brief description of the drawings]
FIG. 1 is an exploded explanatory view showing a main part of an embodiment of a torque wrench according to the present invention.
FIG. 2 is a plan view showing an embodiment of a torque wrench according to the present invention.
FIG. 3 is a partially cut side view showing an embodiment of a torque wrench according to the present invention.
FIG. 4 is a plan view showing an FM transmitter in the case in particular.
FIG. 5 is a plan view showing a toggle link mechanism in the case in particular.
FIG. 6 is a plan view showing the relationship between the clutch pawl and the clutch piece.
FIG. 7 is an explanatory cross-sectional view showing a link and an operation mechanism related to the link.
FIG. 8 is an explanatory diagram showing a link-related operation in particular.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Handle member 2 ... Head member 3 ... FM transmitter 4 ... Cover 5 ... Rechargeable battery 6 ... Case 7 ... Electric motor 8 ... Drive shaft 9 ... Primary planetary reduction mechanism 10 ... One-way clutch 11 ... Secondary planetary reduction mechanism 12 ... Square drive shaft 13 ... Ring gear 14 ... Clutch pawl 15 ... Ring gear 16 ... Toggle link mechanism 17 ... Link 18 ... Support shaft 19 ... Stopper rod 20 ... Clutch piece 21 ... Spring 22 ... Stop switch 23 ... Operating piece 24 ... Start Switch 25 ... switch operation knob 26 ... trigger 27 ... support shaft 28 ... grip member 29 ... support shaft

Claims (3)

A rechargeable battery is provided on the tail end side of the handle member, and the head member is pivotally supported at the tip of the handle member with the vertical axis direction perpendicular to the length direction of the handle member as a support shaft direction. A handle portion having a toggle mechanism that relatively swings the head member and the handle member by a toggle operation when a set torque value is exceeded;
A case fixed to the head member;
The output of the electric motor powered by the rechargeable battery is transmitted to the drive shaft through a planetary gear mechanism housed in the case with an axis along the vertical axis direction, and the planetary gear mechanism A drive unit that rotatably supports a ring gear provided with a clutch pawl on an outer peripheral portion with respect to the case, and that is engaged and disengaged with the clutch pawl by a clutch piece that moves in the vertical axis direction; ,
A link that is disposed in the upper part of the case and tilted in the vertical axis direction by the handle member that swings relative to the head member by a toggle operation of the toggle mechanism;
A stopper rod to which the inside of the case can be moved along the vertical axis direction by tilting the vertical axis direction of the link, and the clutch piece is fixed;
Rechargeable torque wrench, characterized in that it comprises a. 2. The rechargeable torque wrench according to claim 1, wherein a micro switch is provided in the case for interrupting power supply to the electric motor by movement of the clutch piece in the vertical axis direction . The rechargeable torque wrench according to claim 1 or 2, further comprising an FM transmitter for transmitting a screw fastening completion signal.

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