JP4268815B2 - Switch unit and torque tool - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a switch unit including a magnetic sensing type switching element such as a reed switch that detects ON / OFF operation by detecting magnetism, and a torque tool such as a torque wrench including the switch unit.
[0002]
[Prior art]
When a set tightening torque is reached, the torque wrench as a torque tool can, for example, notify the operator that tightening with the set torque has been completed by operating a toggle mechanism. .
[0003]
Some torque wrenches are equipped with a switching device that outputs a switch-on signal in conjunction with the operation of the toggle mechanism. A torque wrench equipped with such a switching device, for example, when tightening a plurality of bolts, if the number of counts of output switch signals is the same as the number of all bolts, it is determined that there is no forgetting to tighten. It is used in the forgotten tightening prevention system.
[0004]
FIG. 3 shows a torque wrench provided with a conventional switching device, (a) is an external plan view, (b) is a plan view showing a state where the case shown in (a) is removed, and (c) is a plan view of (b). A-A arrow sectional drawing, (d) shows the OFF state of a reed switch, (e) shows the state of ON of a reed switch.
[0005]
In the torque wrench 1, a head 3 is attached to a lever 2 formed in a tube shape via a toggle mechanism (not shown). For example, a socket (not shown) attached to the head 3 is attached to a nut (not shown) and the lever When the lever 2 is rotated while grasping the grip portion 4 of the No. 2, the nut is tightened, and when the predetermined torque is reached, the toggle mechanism is operated and the lever 2 rotates with an impact of “cutting” against the head 3. Move. At that time, the stud pin 5 provided on the head 3 that is operated by the operation of the toggle mechanism rotates to turn on the output of the switching device.
[0006]
This switching device penetrates the outer wall portion of the lever 2 formed in a flat shape and is movable in a plane direction. The permanent pin 6 fixed to the tip of the stud pin 5 and the movement of the permanent magnet 6. Accordingly, the reed switch 7 is turned on and off.
[0007]
A base 8 is fixed to the outer surface of the lever 2, and a substrate 9 is attached to the base 8. A reed switch 7, an electronic component 10 that constitutes a circuit for outputting a switch signal, and a battery 11 are mounted on the substrate 9. A battery compartment is installed. The substrate 12 is covered with a cover 12, and the cover 12 is attached to the base 8 with screws 13.
[0008]
When the stud pin 5 is moved by the operation of the toggle mechanism, the reed switch 7 is turned on by the permanent magnet 6 fixed to the stud pin 5. Reference numeral 14 denotes an antenna that outputs a signal from the circuit.
[0009]
[Problems to be solved by the invention]
The above-described conventional switching device uses a reed switch 7 that is sensitive to magnetism as a switching element, and the reed switch 7 generates an induced magnetic field in a lead electrode made of a ferromagnetic material by bringing the magnetic field closer. The opposing contact portions of the two lead electrodes are respectively magnetized to the N pole and the S pole, and the opposing contact portions attract each other and come into contact with each other.
[0010]
The stud pin 5 moves in the lead length direction with respect to such a reed switch 7, and when the permanent magnet 6 fixed to the stud pin 5 approaches the contact portion of the reed switch 7, the contact portions contact each other as described above. Then, when the ON signal is output from the circuit and the permanent magnet 6 is separated from the contact portion, the contact portions are separated from each other and the OFF signal is output from the circuit, but the contact between the contact portions is maintained. If the distance between the permanent magnet 6 and the reed switch 7 is too large, the lead electrode does not react. Therefore, it is necessary to maintain the positional relationship between the reed switch 7 and the permanent magnet 6 with high accuracy.
[0011]
However, since the magnetic force of the permanent magnet 6 is not necessarily uniform for each product, and the reed switch 7 also varies in accuracy for each product, the position of the reed switch 7 is one by one when manufacturing a torque wrench. Adjustments need to be made.
[0012]
The position of the reed switch 7 is adjusted by moving the substrate 9 relative to the base 8 to find the optimum position with respect to the permanent magnet 6 and fixing it to that position.
[0013]
Such position adjustment is a complicated operation, and if the position of the substrate 9 is shifted during use, readjustment is required.
[0014]
The present invention has been made in view of such a conventional problem, and does not require position adjustment of a magnetic sensing type switching element such as a reed switch with respect to a permanent magnet, and includes a switching unit that can be easily assembled, and the switching unit. It is an object to provide a torque tool.
[0015]
[Means for Solving the Problems]
According to a first aspect of the present invention, there is provided a switching element that is turned on / off by a magnetic field, and a permanent element that is fixed with a gap to the switching element at a position where the switching element is turned on. By operating the magnet and the actuated part with a switch operating member , the actuating part blocks the action of the magnetic field of the permanent magnet on the switching element and turns the switching element off from the position. A switch actuating member that is movable between a position where the switching element is turned on by applying a magnetic field of a permanent magnet, and the switching element, the permanent magnet, and the switch actuating member are arranged in a case in the switch unit unitized incorporated within, the switch actuating member has one end fixed to the casing The fulcrum portion is raised from the one end portion, the actuated portion extends substantially linearly from the fulcrum portion, the tip of the actuated portion is bent to form the actuating portion, and the inside of the case The switch operation member inserted into the operation member is in contact with the member to be operated and presses the member to be operated. The moving amount of the operating portion is made larger than the moving amount of the operating portion that moves by pressing the operating portion .
[0016]
According to a second aspect of the present invention, the switch operating member according to the first aspect of the present invention is the switch operating member according to the first aspect, wherein the operated portion of the switch operating member is located at the pressing position on the contact side of the switch operating member. A crushable auxiliary actuated portion that comes into contact with the head is provided .
[0017]
According to a third aspect of the present invention, as described in the third aspect of the present invention, in any one of the above aspects, the signal processing circuit includes a signal circuit that outputs the ON / OFF of the switching element as a switch signal in a wired or wireless manner.
[0019]
A fourth invention is as described in claim 4, in the torque tool having a movable member which moves relative to the tool body when the tightening torque reaches the set value, the switch according to any one of claims 1 to 3 A switch unit, and when the switch unit is attached to the tool body, the moving member is inserted into the case of the switch unit as the switch operating member .
[0020]
A fifth invention is as claimed in claim 5, in the fourth invention, the torque tool is characterized by a torque wrench or a torque driver.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
1 and 2 show an embodiment of the present invention.
First Embodiment FIG. 1 shows a torque wrench according to a first embodiment. FIG. 1A shows a torque wrench in which a transmitter is unitized and integrated with a transmission circuit that outputs a switching signal wirelessly. (B) is a cross-sectional view taken along arrow B-B in (a), and (c) is a plan view seen from below assuming that there is no torque wrench lever in (a). In FIG. 1, the same members as those shown in FIG.
[0022]
In FIG. 1, a torque wrench 1 has a unitized transmitter 20 detachably attached to a lever 2 by a screw 21. The transmitter 20 accommodates a switching device, a transmission circuit that outputs a switching signal wirelessly, and a power supply battery 11 in a box-shaped case 23, and an antenna 24 is drawn to the outside from the case.
[0023]
In FIG. 1, the transmitter 20 includes a case 23 in which a small-size substrate 26 is vertically stacked at a predetermined interval below a large-size substrate 25. Various electronic components 27 constituting a transmission circuit for wirelessly transmitting the switch signal are attached, and on the lower surface of the small size substrate 26 arranged below the large size substrate 25, the reed switch 7 constituting the switching device and A permanent magnet 28 for turning on the reed switch 7 is attached, and the permanent magnet 28 is disposed with a gap at a position where the reed switch 7 is turned on.
[0024]
One end of a switching lever 29 made of a leaf spring member is fixed to the inner peripheral side wall surface of the case 23, and the tip end 29a of the switching lever 29 enters between the permanent magnet 28 and the reed switch 7, and the permanent magnet 28 and a tip 29a of the switching lever 29, a magnetic circuit is formed to prevent an induction magnetic field from being generated in the lead electrode of the reed switch 7, and the contact portions of the lead electrodes are in a non-contact state. .
[0025]
The switching lever 29 is fixed to the case 23 in a cantilevered support state with the leading end 29a as a free end, and the leading end 29a of the switching lever 29 enters between the permanent magnet 28 and the reed switch 7 in a no-load state. When the reed switch 7 is turned off and the switching lever 29 is displaced in a direction in which the tip 29a of the switching lever 29 is retracted from the gap between the permanent magnet 28 and the reed switch 7, the reed switch 7 is turned on. .
[0026]
Therefore, the permanent magnet 28 is arranged at a position where the reed switch 7 is turned on, and the tip end portion 29a of the switching lever 29 is larger than the position where the reed switch 7 is turned on by retracting the tip end portion 29a of the switching lever 29. If retracted, fine position adjustment between the permanent magnet and the reed switch becomes unnecessary as in the prior art.
[0027]
In the present embodiment, a transmitter 20 is fixed to a mounting plate 22 welded to a lever 2 of a torque wrench 1 with a screw 21, and a switch provided on the head 3 of the torque wrench 1 when the toggle mechanism is not operating. The stud pin 5 as an operation member is in a non-contact state with the switching lever 29. When the stud pin 5 is moved by the operation of the toggle mechanism, the stud pin 5 displaces the switching lever 29 against its elastic force. The leading end 29a of the switching lever 29 is retracted from the gap between the permanent magnet 28 and the reed switch 7, and the reed switch 7 is turned on.
[0028]
When the reed switch 7 is turned on, a switching signal, for example, for one pulse is output from the transmission circuit. At this time, the operation confirmation LED 31 provided on the upper surface of the large-sized substrate 25 emits light, and the operator can check through the confirmation window 32 provided on the upper surface of the case 23. When the head 3 of the torque wrench 1 is returned to the original position, the stud pin 5 is also returned to the original position along with the return of the toggle mechanism, and the switching lever 29 has its elastic force so that the tip 29a is permanently connected to the reed switch 7. It returns to the position where the gap with the magnet 28 is blocked.
[0029]
As shown in the figure, the switching lever 29 in the present embodiment has a fulcrum portion that is bent into a substantially S-shaped plane from one end fixed to the case 23, and acts substantially linearly from the fulcrum portion. The tip portion 29a is formed by extending the portion and bending the tip of the action portion substantially at a right angle.
[0030]
The switching lever 29 is configured such that the action portion having a long side is pressed against the stud pin 5 on the fulcrum side, and a slight movement of the stud pin 5 is amplified when the toggle mechanism is operated. Thus, by moving the tip end portion 29a for a long distance, the tip end portion 29a can be retracted to a position sufficiently away from the position where the gap between the reed switch 7 and the magnet 28 is blocked, and there is a margin in the ON / OFF operation of the reed switch 7. However, the present invention is not limited to such a configuration. In short, the reed switch 7 and the moving stroke of the stud pin 5 can be used. If the member that magnetically blocks the gap with the permanent magnet 28 can move with a sufficiently long stroke beyond the position where the reed switch 7 is turned on There.
[0031]
Further, in the present embodiment, a vibration isolating member 33 formed of a sponge or the like is provided so as to come into contact with the action portion that forms the long side of the switch lever 29. For example, when a torque wrench is dropped, inertial force or vibration is provided. Thus, the switch lever 29 is prevented from moving in the switch ON direction, preventing malfunction. When the switch lever 29 is actuated by the stud pin 5, the sponge vibration-proof member 33 is formed so as not to interfere with the operation of the switch lever 29 described above.
[0032]
As described above, according to the present embodiment, the permanent magnet 28 is fixed to the reed switch 7 on the same substrate 26 at a position where the reed switch 7 is turned on, and the case 23 to which the substrate 26 is fixed. The tip 29a of the switching lever 29 fixed to the electromagnetic shield between the permanent magnet 28 and the reed switch 7 to turn off the reed switch 7 is unitized, and the portion close to the fixed end of the switching lever 29 is formed. When moved slightly, the tip 29a of the switching lever 29 moves greatly beyond the boundary from the switch OFF to the ON, so that it is not necessary to adjust the position of the reed switch 7 and the permanent magnet 28, and the torque wrench 1 The assembly is completed simply by attaching the transmitter 20 to the attachment plate 22 welded to the lever 2 with the screw 21.
[0033]
In use of the torque wrench, for example, when the tightening torque of the nut reaches a set value, the stud pin 5 moves slightly according to the operation of the toggle mechanism of the torque wrench, and the switching lever 29 is pushed to press the switching lever. The leading end 29a of the switching lever 29 has electromagnetically blocked the gap between the reed switch 7 and the permanent magnet 28, and the leading end 29a of the switching lever 29 retracts greatly beyond the boundary position where the reed switch 7 is turned from OFF to ON. Then, a switching signal is transmitted from the transmission circuit to the receiving unit (not shown) via the antenna line 24. In addition, although the signal from the switching device is transmitted wirelessly, it may be transmitted by wire.
[0034]
Thus, since all the components of the transmitter 20 including the switching device are accommodated in the case, the assembly work is completed simply by attaching the unitized case to the lever 2 of the torque wrench 1.
[0035]
In the present embodiment, when the case of the transmitter 20 is attached to the lever 2 of the torque wrench 1, the position of the stud pin 5 and the switching lever 29 is different if there is a difference in the attachment position of the case depending on the type of torque wrench. Since the relationship also shifts, the switching lever 29 having different dimensions may be prepared in accordance with this, but it is also desired to make the switching lever common.
Second Embodiment FIG. 2 shows a second embodiment.
[0036]
FIG. 2 shows a transmitter unitized with the above-described switching device that uses a common switching lever and integrated with a transmitter circuit that outputs a switching signal wirelessly. (B) is a sectional side view, (c) is a DD arrow view of (b). In addition, the same code | symbol is attached | subjected to the same member as the member shown in FIG. 1, FIG. 3, and the description is abbreviate | omitted.
[0037]
In the present embodiment, the difference from the first embodiment described above is that the fulcrum part of the switching lever 29 is substantially linear, and the auxiliary lever member 40 that is an auxiliary actuated part is formed on the action part formed on the long side. It is in the point which attached.
[0038]
When the transmitter 20 is attached to the lever 2 of the torque wrench 1 and the stud pin 5 and the switching lever 29 are separated from each other, the auxiliary lever member 40 is used as it is, so that the toggle mechanism is not used. In the operating state, the gap between the auxiliary lever member 40 and the stud pin 5 is maintained in a predetermined state.
[0039]
When the transmitter 20 is attached to the lever 2 of the torque wrench 1 and the gap between the stud pin 5 and the switching lever 29 is in the predetermined state, the auxiliary lever member 40 is crushed with pliers or the like. Thus, by thinly attaching the action portion of the switching lever 29, the auxiliary lever member 40 does not act as an obstacle and the switching lever 29 is not operated when the toggle mechanism is in an inoperative state.
[0040]
In each of the above embodiments, a reed switch that does not require a driving circuit and consumes no electric power has been described as an example of a switching element that is turned ON / OFF by sensing magnetism. However, the present invention is not limited to this. For example, an MR element or the like can be used.
[0041]
Further, although a torque wrench is taken as an example of the torque tool, it may be applied to a torque driver.
[0042]
【The invention's effect】
As described above, according to the switch unit of the present invention, since the permanent magnet and the switching element, for example, the reed switch, are assembled with a certain gap on the same substrate, for example, the position adjustment of both is completely not necessary, and switch oN the switching element such as a lead switch moves the actuating portion of the switch actuating member, which obstructs the electromagnetic between operating the switch actuating member in the switch operating member and the permanent magnet and the reed switch Thus, the conventional inconvenience caused by moving the permanent magnet and turning the reed switch on / off was eliminated.
[0043]
In particular, since the switch is unitized, the switch unit can be installed anywhere, and replacement at the time of failure can be easily performed without requiring adjustment work.
[0044]
Further, the movement amount of the operating portion is made larger than the moving amount of the switch operating member that moves by pressing the operated portion for the ON operation , that is , the movement of the switch operating member for operating the operated portion. Even if the amount is small, the switching element can be reliably turned ON, and adjustment of the switching position between ON and OFF becomes unnecessary, and a user-friendly switch unit can be provided.
[0045]
Furthermore, according to the torque tool such as the torque wrench of the present invention, the assembly is completed by simply attaching the switch unit to the tool main body without having to adjust the switch constituent members. In particular, since the operating portion of the switch operating member moves beyond the switching position between ON and OFF and moves more than the moving amount of the operating member , the switching element can be operated even if the moving member (operating member) of the tool is slightly moved. ON / OFF , stable operation can be obtained.
[Brief description of the drawings]
1A and 1B show a torque wrench according to a first embodiment of the present invention, in which FIG. 1A is an external plan view in which a transmitter is attached to a lever of a torque wrench, and FIG. Sectional view, (c) is a plan view seen from below assuming that there is no torque wrench lever in (a).
2A and 2B show a transmitter according to a second embodiment of the present invention, in which FIG. 2A is a cross-sectional view taken along the line CC of FIG. 2B, FIG. 2B is a side sectional view, and FIG. It is a DD arrow line view.
3A and 3B show a torque wrench provided with a conventional switching device, wherein FIG. 3A is an external plan view, FIG. 3B is a plan view showing a state where the case shown in FIG. 3A is removed, and FIG. FIG. 6A is a cross-sectional view taken along line A-A, (d) shows an OFF state of the reed switch, and (e) shows an ON state of the reed switch.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Torque wrench 2 Lever 3 Head 4 Grip part 5 Stud pin 6 Permanent magnet 7 Reed switch 8 Base 9 Substrate 10 Electronic component 11 Battery 12 Cover 13 Screw 14 Antenna 20 Transmitter 21 Screw 22 Mounting plate 23 Case 24 Antenna 25 Large size Substrate 26 Small substrate 27 Electronic component 28 Permanent magnet 29 Switching lever 29a Switching lever tip 31 LED for confirmation
32 Confirmation window 33 Anti-vibration member 40 Auxiliary lever member

Claims (5)

By operating a switching element that is turned ON / OFF by a magnetic field, a permanent magnet fixed with a gap to the switching element at a position where the switch element is turned ON, and a operated part by a switch operating member From the position where the operating part blocks the magnetic field of the permanent magnet on the switching element and turns off the switching element, the magnetic field of the permanent magnet acts on the switching element to turn on the switching element. A switch unit that has at least a switch operating member that can move between positions, and is a unit formed by incorporating the switching element, the permanent magnet, and the switch operating member in a case ;
The switch actuating member is constituted by a spring member having one end fixed to the case, a fulcrum is raised from the one end, and the actuated part extends substantially linearly from the fulcrum, and the actuated part The switch operating member inserted into the case abuts the actuated member and presses the actuated member at a pressing position that is more than the actuating part than the actuating part. As a side, the switch unit is characterized in that the amount of movement of the operating part is larger than the amount of movement of the switch operating member pressing the actuated part for ON operation . 2. The crushable auxiliary actuated portion that abuts against the switch operating member is provided at the pressed position on the abutting side of the switch operating member on the operated portion of the switch operating member. The switch unit described.   3. The switch unit according to claim 1, further comprising a signal circuit that outputs ON / OFF of the switching element as a switch signal in a wired or wireless manner. 4. In the torque tool having a moving member tightening torque is moved relative to the tool body reaches the set value, a switch unit according to any one of claims 1 to 3, Ru Installing the switch unit to the tool body At the time, the moving member is inserted into the case of the switch unit as the switch operating member . The torque tool according to claim 4 , wherein the torque tool is a torque wrench or a torque driver.

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