TWM556198U - Torque screwdriver - Google Patents

Abstract

A torque driver includes a casing, a clamping member, a clutch unit, and an adjustment unit. The clamping member is adapted to be coupled to a sub-head and includes a stem. The clutch unit includes two annular discs disposed on the rod portion, a plurality of clutch grooves, and a plurality of rolling bodies. One of the annular discs is fixed to the rod portion. The clutch grooves are formed between the annular disks, respectively. The rolling bodies are respectively disposed in the clutch grooves. The adjustment unit includes an adjustment member and a spring. The adjusting member is disposed on the rod portion and is displaceable along the rod portion. The spring is sleeved over the stem and constantly provides a resilient biasing force to urge the annular discs toward each other. When the torque required to rotate the clamping member is too large, the annular disks are disengaged from each other, so that the clamping member cannot be rotated.

Description

Torque screwdriver

The present invention relates to a screwdriver, and more particularly to a torque driver.

Referring to Figure 1, a conventional screwdriver 1 includes a subhead 11 and a handle 12 that connects the bit 11 . The user can hold the handle 12 and place the screwdriver head 11 between the screws 101 of a screw 10, and then rotate the screwdriver 1 to drive the screw 10 to rotate and lock. However, when the screw 10 has been locked in the locked object (not shown), the user usually continues to rotate the screwdriver 1 more forcefully in order to ensure that the screw 10 has been locked, resulting in excessive twisting. However, the screw 101 of the screw 10 is worn out, and the problem of chipping occurs, which is necessary for improvement.

Therefore, the object of the present invention is to provide a torque driver that prevents excessive twisting and allows the screw to collapse.

Thus, the novel torque driver is suitable for connecting together sub-heads. The torque driver includes a housing, a clamping member, a clutch unit, and an adjustment unit.

The outer casing includes an accommodation space formed inside.

The clamping member is rotatably disposed in the accommodating space of the outer casing. The clamping member extends along an axis and includes a collet head adapted to connect the driver head and a stem opposite the collet head. The clamping member can spin on the axis as a centerline.

The clutch unit includes an annular disk set, a plurality of clutch grooves, and a plurality of rolling bodies. The annular disk set is sleeved on the rod portion of the clamping member and includes a first annular disk and a second annular disk which are capable of relative rotation. The first annular disk is fixed to the rod portion. Each clutch groove has a clamping groove portion and a clutch groove portion. The card groove portion is formed on one of the first annular disk and the second annular disk and surrounds the stem portion of the clamping member. The clutch groove portion is formed on the other of the first annular disk and the second annular disk and surrounds the stem portion of the clamping member. The rolling bodies are respectively disposed in the clutch grooves.

The adjustment unit includes an adjustment member and a spring. The adjustment member is disposed on the stem portion of the clamp member and is operatively displaceable along the stem portion. The spring is sleeved on the rod portion and is biased against the annular disk group to provide a resilient biasing force to displace the first annular disk and the second annular disk toward each other.

The effect of the present invention is that the elastic biasing force provided by the spring enables the second annular disk to rotate the first annular disk through the rolling elements, so that the clamping member drives the screwdriver head screw. When the torque required for the locking screw is too large, the second annular disk will be disengaged from the first annular disk, so that the clamping member cannot be rotated, thereby avoiding excessive twisting and allowing the screw to collapse.

Referring to Figures 2, 3 and 4, a first embodiment of the novel torque driver is adapted to connect the sub-heads 9 together. The torque driver includes a casing 2, a clamping member 3, a clutch unit 4, and an adjustment unit 5.

The outer casing 2 includes an accommodating space 21 formed therein and an outer wall 22 defining the accommodating space 21. The outer wall 22 has a base wall portion 221, a side wall portion 222 surrounding the periphery of the base wall portion 221, and two sliding holes 223. The sliding holes 223 are formed on opposite sides of the side wall portion 222, respectively.

The clamping member 3 extends along an axis L and is disposed in the accommodating space 21, and is rotatable with the axis L as a center line. The clamp member 3 includes a clamp head 31 adapted to connect the driver head 9, a stem portion 32 opposite the clamp head portion 31, and an external thread 33 formed on the stem portion 32. The clamping head portion 31 protrudes from the base wall portion 221 and has a blind hole 311 extending inwardly from the end thereof, a screw hole 312 extending inwardly from the outer circumferential surface and communicating with the blind hole 311, and being formed on the outer circumference Outer ring groove 313. The clamping member 3 is rotatably disposed on the base wall portion 221 of the outer casing 2 through a C-shaped buckle 61 disposed on the outer ring groove 313, and the blind hole 311 is adapted to allow the screwdriver head 9 to be placed and passed through A stop screw 62 is locked to the screw hole 312 to press the end of the stop screw 62 against the bit 9 to fix it to the blind hole 311 of the chuck head 31.

The clutch unit 4 includes an annular disk set 41, a plurality of clutch grooves 42, and a plurality of rolling bodies 43. The annular disk set 41 is sleeved on the rod portion 32 of the clamping member 3 and includes a first annular disk 411 and a second annular disk 412 which are capable of relative rotation. The first annular disk 411 is fixed to the rod portion 32. In the present embodiment, the first annular disk 411 is integrally formed with the clamping member 3. The second annular disk 412 is sleeved on the rod portion 32. The opposite sides of the second annular disk 412 are slidably disposed on the side wall portion 222 of the outer casing 2 through two pins 44 respectively piercing the sliding holes 223.

The clutch grooves 42 are formed in the annular disk group 41. Each of the clutch grooves 42 may be of a spherical shape or a cylindrical shape and has a locking groove portion 421 and a clutch groove portion 422. The locking groove portion 421 is formed in one of the first annular disk 411 and the second annular disk 412 and surrounds the rod portion 32 of the clamping member 3. The clutch groove portion 422 is formed on the other of the first annular disk 411 and the second annular disk 412 and surrounds the rod portion 32 of the holder 3. The number of the clutch grooves 42 is six, but it may be two, three, four, five, or seven or more. In the present embodiment, the clutch grooves 42 are all spherical in shape, and the card groove portions 421 are formed in the first annular disk 411, and the clutch grooves 422 are formed in the second annular disk 412. .

The number of the rolling elements 43 is changed in accordance with the number of the equal clutch grooves 42, which are six, and are respectively disposed in the clutch grooves 42. The rolling elements 43 may adopt balls or rollers corresponding to the configuration of the clutch grooves 42. When the configuration of the clutch grooves 42 is a spherical shape, the rolling elements 43 adopt balls, and when the clutch grooves are used, When the structure of 42 is a column type, the rolling elements 43 are rollers. In this embodiment, the rolling elements 43 all use balls.

The adjusting unit 5 includes an adjusting member 51 and a spring 52. The adjustment member 51 is disposed on the stem portion 32 of the clamp member 3 and is operatively displaceable along the stem portion 32. The adjusting member 51 has a threaded hole 511 for engaging the external thread 33, and is displaceable on the rod portion 32 of the holding member 3 by rotating the adjusting member 51. The spring 52 is sleeved on the rod portion 32, and abuts against the second annular disk 412 of the annular disk group 41, and provides a resilient biasing force to drive the first annular disk 411 and the second annular disk 412 toward Displace each other. In the present embodiment, the adjusting member 51 is a nut, and the spring 52 is a compression spring 52, and the opposite ends thereof respectively abut against the second annular disk 412 of the clutch unit 4 and the adjusting member 51 of the adjusting unit 5.

After the driver head 9 is mounted on the chuck head 31, the user can operate the torque driver to rotate the driver head 9 to lock the screw. When the torque driver is rotated, the second annular disk 412 is rotated by the pins 44 to rotate together, and the elastic biasing force provided by the spring 52 of the adjusting unit 5 is placed on the second annular disk 412. The rolling elements 43 engage the first annular disk 411, and the first annular disk 411 is rotated to rotate the clamping member 3 around the axis L, so that the user can lock the screw .

Referring to Figures 4, 5 and 6, when the torque required to tighten the screw is too large, the torque forces the rolling elements 43 out of the clutch grooves 422, and rotating the housing 2 only drives the first The two annular disks 412 are rotated. Thus, as long as the user continues to rotate the torque driver, the first annular disk 411 and the second annular disk 412 in the clutch unit 4 are disengaged from each other, and the clamping member 3 cannot be driven. Continue to rotate, thereby avoiding excessive twisting and allowing the screw to collapse. This is because when the elastic biasing force provided by the spring 52 of the adjusting unit 5 is insufficient, the rolling elements 43 located between the annular disk sets 41 will start to disengage from the clutching grooves 422, so that the second The annular disk 412 cannot drive the first annular disk 411 to rotate through the rolling elements 43 to leave the clamping member 3 in place. Thus, as long as the torque of the tightening screw exceeds a certain level, the torque driver will not continue to drive the screw to tighten.

When it is necessary to tighten the screw, the user only needs to rotate the adjusting member 51 to displace and compress the spring 52 toward the second annular disk 412, thereby increasing the elasticity against the second annular disk 412. The offset force can increase the upper limit of the torque when the torque driver is screwed. To reduce the torque, just reverse the previous steps.

Thus, the elastic biasing force provided by the spring 52 enables the second annular disk 412 to rotate the first annular disk 411, so that the clamping member 3 drives the screwdriver head 9 to lock the screw, and when locked When the torque required for the screw is too large, the second annular disk 412 will be disengaged from the first annular disk 411, and the clamping member 3 cannot be rotated, thereby avoiding excessive twisting and allowing the screw to collapse.

Referring to Figures 7 and 8, a second embodiment of the torque driver of the present invention is substantially the same as the first embodiment except for the type of the clutch grooves 42.

The annular disk set 41 also has a plurality of concave surfaces 420 that define the clutch grooves 422, respectively. Each concave surface 420 has a hinge area 423 and a separation area 424. The abutment area 423 is coupled to the rolling element 43. The detachment zone 424 extends obliquely away from the abutment zone 423. In the present embodiment, the abutment region 423 is substantially parallel to the stem portion 32 of the clamping member 3, and the disengagement region 424 is substantially inclined.

When the torque driver is rotated, the rolling elements 43 are sandwiched in the annular disk set 41 and abut against the disengagement zone 424 of the clutch grooves 42. When the screws are tightened, the rolling elements 43 will slide along the disengagement zone 424 and then disengage from the clutch grooves 422, at which time the clamping member 3 does not spin about the axis L.

When the screw is to be loosened, the torque driver is reversed in the opposite direction. At this time, the rolling elements 43 will abut against the abutment area 423 of the clutch groove portion 422 (see Fig. 7). Since the abutment zone 423 is not a beveled surface, the rolling elements 43 are more difficult to disengage, thus providing a greater torque output to loosen the screws.

Because the hinges 423 and the detachment zones 424 have different slopes, different torques can be provided when the screws are tightened or loosened. Through this design, it can provide greater torque for the user to loosen the screw to avoid the torque of the output being re-adjusted.

Thus, when the user wants to remove the screw, the static friction between the screw and the screw is not excessive, and the output torque of the torque driver is insufficient, and the screw cannot be loosened.

Referring to Figures 9 and 10, a third embodiment of the torque driver of the present invention is substantially the same as the second embodiment except for the type of the clutch grooves 42.

The abutment region 423 is curved and has a curvature equal to the curvature of each of the rolling bodies 43, whereby each of the rolling bodies 43 can be attached. The detachment zone 424 is curved and has a curvature that is less than the curvature of each of the rolling bodies 43.

As such, the third embodiment not only provides the same functions as the second embodiment, but also provides a configuration of the clutch groove 42 of another configuration, which can be adjusted as needed.

In summary, when the torque required to rotate the clamping member 3 is too large, the second annular disk 412 will be disengaged from the first annular disk 411, so that the clamping member 3 cannot be rotated, thereby avoiding Excessively twisting and letting the screw collapse. Therefore, it is indeed possible to achieve the purpose of the present invention.

However, the above is only the embodiment of the present invention, and when it is not possible to limit the scope of the present invention, all the simple equivalent changes and modifications according to the scope of the patent application and the contents of the patent specification are still This new patent covers the scope.

1‧‧‧ Screwdriver
11‧‧‧ screwdriver head
12‧‧‧Hands
2‧‧‧ Shell
21‧‧‧ accommodating space
22‧‧‧ outer wall
221‧‧‧Base Wall Department
222‧‧‧ Side wall
223‧‧ ‧Slide hole
3‧‧‧Clamping parts
31‧‧‧ Clip head
311‧‧‧Blind hole
312‧‧‧ screw hole
313‧‧‧ Ring groove
32‧‧‧ pole
33‧‧‧ external thread
4‧‧‧ clutch unit
41‧‧‧Circular disk set
411‧‧‧First ring
412‧‧‧second ring
42‧‧‧Clutch slot
420‧‧‧ concave
421‧‧‧ card slot
422‧‧‧Clutch trough
423‧‧‧ by district
424‧‧‧Without area
43‧‧‧ rolling elements
44‧‧‧Latch
5‧‧‧Adjustment unit
51‧‧‧Adjustment
511‧‧‧Threaded holes
52‧‧‧ Spring
61‧‧‧C buckle
62‧‧‧stop screws
9‧‧‧ screwdriver head
L‧‧‧ axis

Other features and effects of the present invention will be apparent from the following description of the drawings, wherein: FIG. 1 is a perspective view illustrating a conventional screwdriver; FIG. 2 is a perspective view showing the novel torque driver of the present invention. Figure 3 is an exploded perspective view showing the first embodiment; Figure 4 is a partial cross-sectional view showing the first embodiment; Figure 5 is a schematic view showing a rolling element of the first embodiment Figure 6 is a schematic view similar to Figure 5, illustrating the rolling element of the first embodiment is separated from a clutch groove of the clutch groove; Figure 7 is a schematic view of a new type of torque driver The structure of one of the clutch grooves of the second embodiment, wherein the rolling body abuts against a hinge area; FIG. 8 is a schematic view similar to FIG. 7, illustrating the rolling body of the second embodiment along the disengagement Figure 9 is a schematic view showing the structure of one of the clutch grooves of a third embodiment of the novel torque driver, wherein the rolling body abuts against the abutment zone; and Figure 10 is similar to Figure 9 It is intended to described the third embodiment of the rolling element moves along the disengagement zone.

Claims (7)

A torque driver for connecting a sub-head, the torsion screwdriver comprising: an outer casing comprising an accommodation space formed therein; a clamping member rotatably disposed in the accommodation space of the outer casing, the clamping member Extending along an axis and including a collet head adapted to connect the bit, and a stem opposite the collet, the grip can be centered on the axis; a clutch unit, including An annular disk set, a plurality of clutch grooves, and a plurality of rolling bodies, the annular disk set is sleeved on the rod portion of the clamping member, and includes a first annular disk and a second annular disk that can be combined for relative rotation The first annular disk is fixed on the rod portion, and the clutch grooves are formed on the annular disk group, and each of the clutch grooves has a clamping groove portion and a clutch groove portion, and the clamping groove portion is formed therein. One of the first annular disk and the second annular disk, and surrounding the rod portion of the clamping member, the clutch groove portion is formed on the other of the first annular disk and the second annular disk And surrounding the shank of the clamping member, the rolling bodies are respectively disposed in the clutch grooves; and An adjusting unit includes an adjusting member and a spring disposed on the rod portion of the clamping member and operatively displaced along the rod portion, the spring sleeve is disposed on the rod portion, and is abutted against the rod portion The annular disk set constantly provides a resilient biasing force to displace the first annular disk and the second annular disk toward each other. The torsion driver of claim 1, wherein the outer casing further comprises an outer wall defining the accommodating space, the outer wall has a sliding hole, and the outer side of the second annular disk is provided with a bolt inserted through the sliding hole. The spring adopts a compression spring, and the opposite ends respectively abut against the second annular disk of the clutch unit and the adjusting member of the adjusting unit. A torque driver according to claim 2, wherein the adjusting member of the adjusting unit has a threaded hole, and the holding member further includes an external thread formed on the rod portion, the external thread engaging the threaded hole. The torsion driver of claim 2, wherein the outer wall of the outer casing further has a base wall portion, the clamping head of the clamping member protrudes from the base wall portion, and has an outer ring groove formed on the outer circumferential surface The clamping member is rotatably disposed at a base wall portion of the outer casing through a C-shaped buckle provided in the outer ring groove. The torsion driver of any one of claims 1 to 4, wherein the annular disk set further has a plurality of concave surfaces respectively defining the clutch grooves, each concave mask having a hinge area and a separation area, the hinge The lands are adapted to abut the rolling body, the detachment zone extending obliquely away from the abutment zone. A torsion driver as claimed in claim 5, wherein the curvature of the abutment zone is equal to the curvature of each of the rolling bodies. The torsion driver of claim 5, wherein the detachment zone has a curvature that is less than a curvature of each of the rolling bodies.