JP3130260B2 - Digital torque screwdriver - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital torque driver integrally provided with a display capable of measuring and displaying a fastening force fastened by a ratchet type digital torque driver.

[0002]

2. Description of the Related Art In a conventional digital torque driver, a strain gauge is attached to a sensor plate provided therein, and the amount of torsion of the sensor plate generated when a screw is tightened by a driver is detected by the strain gauge. The value is displayed on a display, and the tightening torque value of the screw by the torque driver can be read on the display.

[0003]

In such a conventional torque driver, it is known that an indicator and a torque driver are separately formed, and that the display and the torque driver are integrally formed. However, in the case where the torque driver and the indicator are separate structures, since the torque driver and the indicator are connected by a signal line (cord), the screw tightening using the torque driver is performed. At the time of work, the signal line becomes an obstacle, and screw tightening workability is impaired. In addition, visually observing the display value of the indicator installed at a position distant from the torque driver while performing screw tightening work with the torque driver requires a large amount of movement of the head of the tightening worker, and the tightening operation is There were problems such as inconvenience in the attachment work.

[0004] Further, in the case of a torque driver integrally provided with an indicator, the indicator is mounted inside the handle through a display window provided on a side surface or an end surface of the handle of the torque driver. Because of the structure to visually check the displayed value of, the handle grip position during screw tightening work,
Further, there is a problem that it is difficult to visually confirm a display value viewed through the display window depending on a direction of a design or the like.

SUMMARY OF THE INVENTION The present invention has been made in view of such a problem, and has a handle of a ratchet-type digital torque driver, which allows a display to be pivotally supported and changes the display surface of the display to an arbitrary direction. A first object is to increase the visibility of the display value on the display by arbitrarily tilting the display surface of the display so as to be able to do so.

It is a second object of the present invention to increase the visibility of the display by reducing the fluctuation range of the display in conjunction with the operation of the handle during the screw tightening operation.

[0007]

In order to achieve the first and second objects, according to the present invention, an indicator is provided on a handle of a ratchet type digital torque driver in a direction orthogonal to the axis of the torque driver. The shaft is expended, and the indicator shaft is rotatably supported with an indicator that electrically converts the amount of strain of the strain gauge contained in the torque driver and displays it as a tightening torque value of the screw. , On the indicator shaft insertion surface of the indicator,
To form a fan-shaped groove formed between the peripheral surface of the container shaft,
Further, a space is provided in the sector groove along the groove direction of the sector groove.
A plurality of drilled holes,
On the shaft side, the tip is guided in the fan-shaped groove and
A click pin that can be resiliently fitted into
Insert the tip of the click pin resiliently into the drilling hole.
Click machine that holds a click spring for locking
It is characterized by being a digital torque driver with a structure .

[0008]

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on an embodiment shown in the drawings.

Reference numeral 1 denotes a cylindrical grip case. One end of a leaf spring-shaped sensor plate 3 is supported inside the cylindrical grip case 1 via a sensor plate receiving member 2. One end of the sensor plate 3 is integrally connected to the cylindrical grip case 1 via the sensor plate receiving member 2 by screwing the tapered screw 4 into the receiving member 2. Reference numeral 5 denotes a main shaft rotatably supported via a bearing 6 inside one end of the cylindrical grip case 1. A diametrical groove 7 is formed at one end of the main shaft 5. The other end of the sensor plate 3 is inserted into the split groove 7. Reference numeral 8 denotes a metal ring provided to prevent the opening of the split groove 7, and 9 denotes a strain gauge attached to a side surface of the sensor plate 3.
A ratchet case 10 is fixed to the other end of the main shaft 5 via a pin 11.
Inside, a ratchet shaft 12 located on the same axis as the axis of the main shaft 5 is rotatably mounted so as not to be detached from the ratchet case 10 by the shaft stopper 13. A ratchet gear 14 formed integrally with the ratchet shaft 12 is meshed with a ratchet saw 15 so as to exhibit a well-known ratchet mechanism. 1
Reference numeral 6 denotes a switching lever for switching the meshing direction of the ratchet shaft 12, and reference numeral 17 denotes a switching spring.

Reference numeral 18 denotes a display base fixed integrally with the cylindrical grip case 1 by mounting screws 19. The display base 18 is perpendicular to the axis of the main shaft 5 and the ratchet shaft 12. A display shaft 20 having an axis in a direction in which the display shaft 20 moves is fixed. The indicator shaft 20 rotatably supports an indicator 21 that electrically converts the amount of strain of the strain gauge 9 and displays the result as a screw tightening torque value. The rotation range of the display 21 rotatably supported by the display shaft 20 is:
As shown in FIG. 4, the display surface 22 faces upward from the position 21A where the display surface 22 is substantially parallel to the axis (a) of the cylindrical case 1 by approximately 45 degrees with respect to the axis (a). It can freely rotate within a rotation range of about 135 degrees at the inclined position 21D. The display 21 is
At approximately 45 degree intervals within the rotation range, for example, at the 21B position,
A click mechanism is provided to enable selective positioning at the 21C position. As shown in FIG. 5, the click mechanism has a fan-shaped groove 23 formed by an arc of about 135 degrees at a position near the display shaft of the display 21 and a 135-degree sector. Drilling holes 24A, 24 are provided at positions that divide the entire length of the groove 23 into three equal parts.
B, 24C, 24D are formed, also on the display shaft 20 side is to click pin 26 which is fitted into the drilled hole receiving repression action of the click spring 25 is retained. By thus causing the tip of the click pin 26 in suppression force by the click spring 25, selectively engaged in any one of drilling holes 24A to 24D,
The display surface 22 of the display 21 can be set in a direction that is easy for the screw tightening operator to see.

Reference numeral 27 denotes a grip member attached to the outer surface of the cylindrical grip case 1, and reference numeral 28 denotes a grip member 2 thereof.
A cap attached to the end of 7, 29 is a coupler spring that receives a steel ball 30, and 31 is an end stopper that prevents the display shaft 20 from being detached from the display base 18.

The above is the embodiment of the present invention. Next, the operation will be described.

That is, in the present embodiment, in the digital torque driver, the indicator 21 is electrically converted from the amount of strain of a strain gauge provided in the torque driver, and the indicator 21 is used as a screw tightening torque value. The display 21 has a structure in which the inclination angle of the display surface 22 can be changed within a predetermined rotation range.

Therefore, at the time of the screw tightening operation using the torque driver, the screw tightening torque value can be checked very easily by the indicator 21 attached to the torque driver. Further, the display surface of the display 21 provided on the torque driver can be tilted in an appropriate direction according to the eye point of the screw tightening operator, and the display surface of the display is made utilizing the click mechanism. Can be appropriately positioned and held on the inclined surface, so that the visibility of the display value on the display can be enhanced.

Further, the inclination of the display surface can be set to a predetermined inclination position via a click mechanism, so that the display surface does not swing or fluctuate during screwing work. This also enhances the visibility of the display value on the display surface.

Further, by combining the display 21 having the above-described structure with a ratchet type digital driver, the operation of the display which fluctuates with the handle of the driver becomes a reciprocating motion in an arc shape, and the fluctuation range of the display 21 is narrowed. Because it is fit
The movement of the eye point of the tightening operator following the display surface of the display can be reduced, thereby improving the ease of the tightening operation and the visibility of the display surface.

[0018]

According to the present invention, the display device is rotated by the display shaft.
The indicator that can be supported is placed around the indicator shaft.
A fan-shaped groove formed along the direction
A plurality of cones spaced along the groove direction of the sector groove
A hole is formed and the indicator shaft side is
The end is guided in the sector groove and repressed in the drilling hole.
With and without click pins that can be fitted
Engagement between the click pin and the end of the fan-shaped groove
Restricts the rotation range of the display, which
Prevents the display surface from being turned more than necessary (inclination)
it can. In addition, the click pin tip and one of the drilling holes
Lock the display surface of the display unit within the above rotation range.
Positioning and holding at several arbitrary tilt angle positions and display
Position the surface so that it faces the operator's eye point.
Can be Therefore, ratchet-type digital torqued
Display according to the working posture of the worker using the driver.
The display surface of the indicator should be tilted so that the worker can see it most easily.
Since it can be fixed, the operator can
The coupling torque value can be easily checked visually,
The workability of screw tightening at an appropriate tightening torque value is remarkable.
Improve.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an internal mechanism illustrating an embodiment of a digital torque driver according to the present invention.

FIG. 2 is a partially cutaway plan view of FIG.

FIG. 3 is a right side view of the partially cut-out portion in FIG. 1;

FIG. 4 is an explanatory diagram showing an operation state of a display device showing an embodiment of the digital torque driver of the present invention.

FIG. 5 is an explanatory diagram showing a click mechanism of an indicator provided in the digital torque driver of the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Cylindrical grip case 2 ... Sensor plate receiver 3 ... Sensor plate 4 ... Taper screw 5 ... Main shaft 6 ... Bearing 7 ... Split groove 8 ... Metal ring 9 ... Strain gauge 10 ... Ratchet case 11 ... Pin 12 ... Ratchet shaft 13 ... Axle stop 14 ... Ratchet gear 15 ... Ratchet saw 16 ... Switching lever 17 ... Switching spring 18 ... Display base 19 ... Mounting screw 20 ... Display shaft 21 ... Display 22 ... Display surface 23 ... Sector-shaped groove 24A-24D ... Kneading hole 25 ... Click spring 26 ... Click pin 27 ... Grip member 28 ... Cap 29 ... Coupler spring 30 ... Steel ball 31 ... End stopper

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-127675 (JP, A) JP-A-2-29709 (JP, A) JP-A-63-72909 (JP, A) 35875 (JP, U) Hikaru 2-102969 (JP, U) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B25B 23/14, 23/142

Claims (1)

(57) [Claims] The handle portion of claim 1. A ratchet type digital torque driver, the display is spending a shaft (20) to spend the axis perpendicular direction of the torque driver, on the display unit shaft (20), the ratchet type digital electrically converted rotatably allowed supported display for displaying the tightening torque value of the screw (21) by the amount of strain of the strain gauges (9) which is furnished to the torque driver, further, the table
The indicator shaft is inserted into the indicator shaft (20) insertion surface.
Fan-shaped groove (2) formed between the shaft and the peripheral surface of the shaft (20).
3) and further within said sector groove (23)
(23) A plurality of drilled holes drilled along the groove direction
And on the indicator shaft (20) side,
The tip is guided in the fan-shaped groove and each drilling hole is
A click pin (26) resiliently fit into the
Insert the tip of the rick pin resiliently into the drilling hole
Click spring holding the click spring (25)
Digital torque driver, which has a locking mechanism .