TWI727829B - Warning device for a torque adjustor of a torque wrench - Google Patents

Abstract

A torque wrench includes a handle, a wrench, a clutch, an adjustor, a grip, a scale ring and a locking collar. The wrench includes a lever inserted in and pivotally connected to the handle. The clutch is connected to the lever to stop rotating a workpiece when a maximum value of torque is reached. The adjustor is connected to the clutch and includes a knob operable to adjust the maximum value of torque. The knob is provided with a first color. The grip is connected to the handle. The scale ring is connected to the grip. The locking collar is provided with a second color. The locking collar is movable between a locking position to prevent the knob from rotation relative to the grip and show the first color and an unlocking position to allow the knob to rotate relative to the grip and show the second color.

Description

Warning device for torque adjustment

The invention relates to a warning device for a hand tool, in particular to a torque wrench, a reminder or warning device for turning off or on the torque adjustment.

The known torque wrench has a support member, one end of the support member is pivotally connected with a head, and the other end is fixed with a grip. The pivotal connection structure includes: an arm and a shaft, and the arm extends a certain length outward from the head, and then is inserted into the hollow support member. The shaft usually refers to a rivet that penetrates the support member and the arm, and the support arm penetrates into the end of the support member to contact a single side of a rattle. The other side of the rattle is in rolling contact with a pressing block, and the pressing block pushes the rattle to touch the arm. The power source comes from a compression spring embedded in the support.

In use, the head directly or indirectly joins a workpiece, such as a screw, bolt or nut. The distance from the head to the grip is multiplied by a force applied by the user to the grip to obtain a torque (or torque) that the torque wrench drives the workpiece to rotate. The torque and a reaction force of the workpiece meet at the rattle. When the torque is greater than or equal to the reaction force, the workpiece continues to be locked or loosened. If the torque is less than the reaction force, the arm is separated from the rattle, interrupting the transmission of torque to the workpiece, and avoiding damage to the screw structure by external forces.

However, the prior art does not tell the user one thing, that is, whether the torque adjustment function is on or off. Therefore, the use of torque wrenches is dangerous.

In view of this, the inventor of the present case proposes a warning device, the main purpose of which is to use a structure that combines and separates showing different colors to warn or remind the user that the torque adjustment function is turned off or on, reducing the incidence of danger, and relatively improving the torque wrench The safety of use.

From the achievement of the above objectives, the present invention includes:

A torque wrench is equipped with a grip, and the grip has a spur gear;

A knob is equipped with an external gear, the knob is equipped with a torque wrench so that the external gear faces the spur gear;

An adjusting button has a rear section, and the outer side of the rear section has a set of straight teeth. An internal gear on the inside of the adjusting button extends to the rear section. The internal gear engages the spur gear and the external gear as a locked position. The outer circumferential surface of the knob Expose the adjusting button to show the unadjustable color of the torque; release the blocking relationship of the spur gear, and define the internal gear biting the external gear as an unlocking position. The adjusting button covers the circumferential surface of the knob, and the two rotate in the same direction relative to the grip;

A set of straight teeth is formed on the inner side of a scale ring. When in the locked position, the scale ring is close to each other between the handle and the knob. When in the unlocked position, the scale ring leaves the handle or knob on one side, and the group is straight. The teeth maintain a meshing relationship with the straight teeth of the adjusting button in both the locked and unlocked positions; and

It has a color ring that is different from the color of the knob. In the locked position, the color ring is covered by the scale ring; in the unlocked position, the color ring appears on one side of the scale ring.

In this way, the adjusting button of the present invention is like a switch. It adopts the color that shows the locked position in the combined state (such as red), or the color that shows the unlocked position in the separated state (such as green) to warn or remind the user. The adjustment function is turned off or on, which reduces the incidence of danger and relatively improves the safety of the use of torque wrenches.

In order to make the purpose, structure, features, and advantages of the present invention more simple and understandable, one or more preferred embodiments are described in detail below in conjunction with the accompanying drawings.

Fig. 1 is a plan view showing the first embodiment of the torque wrench 10. The torque wrench 10 has a driving structure 11 at one end and an adjusting mechanism 18 at the other end, and the two are connected by a support 12. The supporting member 12 is hollow, and a torque mechanism 15 is assembled therein. A grip 16 fixes the support 12 adjacent to the adjustment mechanism 18 outside.

The driving structure 11 has a head 14, the head 14 extends an arm 13, the arm 13 is inserted into the support 12, and the two maintain a pivotal relationship. The torque mechanism 15 includes a rattle 19 and a compression spring 21, and the rattle 19 and the arm 13 penetrate into the end of the support 12 to pivotally connect a connecting rod 17. The adjusting mechanism 18 includes a transmission rod 43, one end of the transmission rod 43 is combined with a knob 40 to rotate in the same direction, and the other end is formed with a thread 47 on the outer side, which is screwed to a thread 48 on the inner side of the tube body 46. The tube 46 resists the compression spring 21, and a force of the compression spring 21 pushes the rattle 19 to move toward the arm 13, and the arm 13 supports the head 14 to expose the outside of the support 12 and does not swing easily.

A user (not shown in the figure) grips the grip 16 and operates the driving structure 11 to apply a torque to a workpiece (not shown in the figure) to perform a locking or unscrewing operation. At the same time, a reaction force of the workpiece is transmitted to the arm 13 through the head 14, and the force of the rattle 19 is outputted by the compression spring 21 against the balance. When the reaction force is less than the acting force, the head 14 continues to lock or loosen the workpiece. When the reaction force is greater than the acting force, the arm 13 pushes away the rattle 19, interrupting the torque transmitted by the head 14 to the workpiece.

In other words, the greater the force of the compression spring 21, the stronger the torque transmitted by the head 14 to the workpiece. Therefore, the force of the compression spring 21 is proportional to the torque of the head 14.

Then see Fig. 3, the transmission rod 43 is installed in a supporting structure 44, and can only rotate in the supporting member 12, but cannot move along the axis direction. In addition, the tube body 46 cannot rotate inside the support 12, but can move back and forth along the axial direction. Therefore, the tube body 46 converts the rotational kinetic energy of the transmission rod 43 into the potential energy of linear motion, thereby changing the force of the compression spring. , Small, determine the strength or weakness of the torque transmitted by the head.

Supported by the transmission rod 43, an external gear 52 of the knob 40 forms a spur gear 37 facing the outside of a front section 45 of the handle 16. In addition, a cover 42 seals the end surface of the knob 40 to prevent dust or dirt from entering the interior of the knob 40.

The adjustment mechanism also has a scale ring 32 and an adjustment button 33. Wherein, the adjusting button 33 is sleeved on the outside of the knob 40 and extends a rear section 38 in the direction of the handle 16. An internal gear 50 inside the adjusting button 33 extends to the rear section 38, and the internal gear 50 locks the spur gear 37 and the external gear. 52 is considered a locked position.

When in the locked position, the spur gear 37 has a blocking function, which prohibits the adjustment button 33 from driving the knob 40 to rotate relative to the support 12 (or the grip 16). Moreover, a set of straight teeth 54 is formed on the outer side of the rear section 38, which engages a set of straight teeth 56 on the inner side of the scale ring 32, so that the scale ring 32 cooperates with the adjusting button 33 to remain stationary.

It is worth noting that the outer circumferential surface 41 of the knob 40 exposes the adjusting knob 33. At the same time, the scale ring 32 is close to each other between the handle 16 and the knob 40, and a color ring 36 of the rear section 38 is covered by the scale ring 32.

In principle, the color of the circumferential surface 41 is selected from dark colors, such as green, blue or gray, to show the state that the torque is not adjustable, and to remind the user to use the torque wrench with confidence. The color of the color circle 36 is selected from the eye-catching color system, such as red, yellow or white, to show the state of adjustable torque, and it is advisable to warn the user not to use a torque wrench.

In this embodiment, the color of the circumferential surface 41 is derived from the color of the knob 40 itself. In some embodiments, the color of the circumferential surface 41 comes from a layer of sticker, film or other attachments on the outer surface of the knob 40.

In this embodiment, the color ring 36 is a belt, and the belt is sleeved in a groove 39 of the adjusting button 33 (see Fig. 4). In some embodiments, the color wheel 36 is paint, and the paint is sprayed on the outer surface of the adjusting knob 33.

In addition, a connecting member 35 is arranged between the root of the front section 45 and the outer surface of the grip 16, and a transparent cover 34 is fixed in conjunction with the grip 16 so that the transparent cover 34 can cover the scale ring 32.

FIG. 2 is a plan view, and the outer surface of the grip 16 showing an enlarged view is provided with a torque display 20 and an arrow portion 30. Wherein, the torque display 20 is designed with a transparent straight bar 22, and a set of scales 24 on one side of the straight bar 22 is compared with a colored segment 28 to be able to interpret the torque value of the torque wrench 10 in metric units. A set of scales 26 on the other side of the bar 22 represents the torque value in English units. The torque value is an integer before the decimal point. With the arrow 30 pointing to one of a set of scales (not labeled) and a set of numbers 31 outside the scale ring 32, the value after the decimal point can be obtained to accurately understand the torque wrench 10 The actual torque value.

The colored section 28 referred to here generally refers to the user who visually observes a layer of paint attached to the surface of the tube body 46 (see Figure 3) through the torque display 20.

As shown in Figures 4 and 5, the blocking relationship of the spur gear 37 is released, and the internal gear 50 bites the external gear 52 as an unlocked position. In the unlocked position, the adjusting button 33 covers the circumferential surface 41 of the knob 40, and the two rotate in the same direction relative to the grip 16. Through the engagement relationship of the threads 47 and 48, the transmission rod 43 drives the tube 46 relative to the support 12 (Or grip 16) linear displacement to change the torque value of the torque wrench. The transparent cover 34 prevents the scale ring 32 from linearly shifting with the rear section 38, but does not interfere with the adjustment knob 33 driving the scale ring 32 to rotate in the same direction, so that the color ring 36 appears on one side of the scale ring 32. Therefore, the color ring 36 appears between the divided scale ring 32 and the adjustment knob 33.

FIG. 6 shows the second embodiment of the warning device. Its structure is roughly the same as that of the first embodiment. The difference is that the color ring 36 appears between the separate scale ring 32 and the grip 16 when in the unlocked position. Under the condition that the normal operation of the spur gear is not affected, the color ring 36 is arranged outside the front section 45 of the grip 16.

Secondly, the connecting member 35 connects the transparent cover 34 to the adjusting button 33 to cover the scale ring 32. The direction of the transparent cover 34 is opposite, which neither interferes with the adjustment button 33 driving the scale ring 32 to rotate in the same direction, but also limits the linear displacement of the scale ring 32 with the adjustment button 33.

10: Torque wrench 11: Drive structure 12: Support parts 13: arm 14: head 15: Torque mechanism 16: grip 17: connecting rod 18: adjustment mechanism 19: castanets 20: Torque indicator 21: Compression spring 22: Straight 24, 26: scale 28: colored segments 30: Arrow 31: number 32: scale ring 33: Adjust button 34: transparent cover 35: coupling 36: color circle 37: Spur gear 38: back section 39: Groove 40: knob 41: Circumference 42: Lid 43: drive rod 44: Support structure 45: front section 46: Tube body 47, 48: screw teeth 50: internal gear 52: external gear 54, 56: Straight teeth

Figure 1 depicts the partial internal structure of the first embodiment of the torque wrench combined. Figure 2 shows an enlarged grip. Figure 3 shows the internal structure of the adjusting mechanism in the locked position. Figure 4 depicts the adjustment mechanism of the unlocked position. Figure 5 shows the outline of the adjustment mechanism in the unlocked position. Figure 6 shows the outline of the adjustment mechanism in the unlocked position of the second embodiment of the torque wrench.

10: Torque wrench

12: Support parts

16: grip

18: adjustment mechanism

20: Torque indicator

22: Straight

24, 26: scale

28: colored segments

30: Arrow

31: number

32: scale ring

33: Adjust button

36: color circle

38: back section

39: Groove

40: knob

Claims (8)

A warning device for torque adjustment, including: A torque wrench (10) is equipped with a grip (16), and the grip (16) is equipped with a spur gear (37); A knob (40) is equipped with an external gear (52), and the knob (40) is equipped with a torque wrench (10) so that the external gear (52) faces the spur gear (37); An adjusting button (33) has a rear section (38). The rear section (38) has a set of straight teeth (54) on the outside. An internal gear (50) inside the adjusting button (33) extends to the rear section (38). The gear (50) locks the spur gear (37) and the external gear (52) as a locked position, and the outer circumferential surface (41) of the knob (40) reveals the adjusting button (33), which shows the color of non-adjustable torque; The blocking relationship of the spur gear (37) defines the internal gear (50) to bite the external gear (52) as an unlocked position. The adjustment button (33) covers the circumferential surface (41) of the knob (40), and the two hold relative to each other. Turn (16) in the same direction; A set of straight teeth (56) are formed on the inner side of a scale ring (32). When in the locked position, the scale ring (32) is close to each other between the handle (16) and the knob (40). When in the unlocked position , The scale ring (32) is away from the grip (16) or the knob (40) on one side, and the set of straight teeth (56) keep meshing with the straight teeth (54) of the adjusting button (33) in the locked and unlocked positions Connection; and It has a color ring (36) that is different from the color of the knob (40). When in the locked position, the color ring (36) is covered by the scale ring (32); when in the unlocked position, the color ring (36) appears on the scale The ring (32) is one-sided. For the warning device for torque adjustment described in claim 1, when in the unlocked position, the scale ring (32) is separated from the adjustment button (33) and the color ring (36) is displayed. The warning device for torque adjustment according to claim 2, wherein a slot (39) of the rear section (38) receives a color ring (36). The warning device for torque adjustment according to claim 2 or 3, wherein the handle (16) is combined with a transparent cover (34) to cover the scale ring (32), and the transparent cover (34) does not interfere with the adjustment knob ( 33) Drive the scale ring (32) to rotate in the same direction to prevent the scale ring (32) from linear displacement with the rear section (38). For the warning device for torque adjustment as described in claim 1, when in the unlocked position, the scale ring (32) and the handle (16) are separated and the color ring (36) is displayed. The warning device for torque adjustment according to claim 5, wherein the color ring (36) is arranged outside a front section (45) of the spur gear (37) formed by the grip (16). The warning device for torque adjustment according to claim 5 or 6, wherein the adjustment button (33) is combined with a transparent cover (34) to cover the scale ring (32), and the transparent cover (34) does not interfere with the adjustment button ( 33) Drive the scale ring (32) to rotate in the same direction to limit the linear displacement of the scale ring (32) with the adjustment knob (33). The warning device for torque adjustment according to claim 1, wherein the scale ring (32) is provided with a set of numbers (31).

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