TW201341130A - Torque tripping mechanism and screwdriver having the same - Google Patents

Abstract

Disclosed herein is a screwdriver, where a torque tripping mechanism is assembled between a gripping member and a cover body. This torque tripping mechanism includes a first engaging member and a second engaging member. The first engaging member has an end bulged with plural protrusions, and the outside surface of each protrusion has a first hypotenuse and a second hypotenuse, which are matched with the corresponding recess portion of the second engaging member. The first hypotenuse and the reference line that passes through the intersection of the two hypotenuses form an angle, which is not equal to the angle formed by the reference line and the second hypotenuse, thus enabling the screwdriver to generate two torque tripping performances.

Description

Torque jumping mechanism and screwdriver with the torque tripping mechanism

The present invention relates to a torque detachment technique for a tool, and more particularly to a mechanism suitable for use in a tool having both torque tripping efficiencies.

A wide variety of tools, such as wrenches and screwdrivers, can perform a tight work on a workpiece (such as a nut or screw).

At the beginning of the unscrewing phase or at the end of the locking phase, the tool can output the maximum torque to the workpiece, but it is not the most suitable force. This is because the degree of tightness is judged by personal experience, and it is easy to make the torque exceed the load of the workpiece, causing the screw to collapse and being unusable.

In order to reduce the chance of chipping, the tool manufacturer has developed a torque tripping mechanism, which mainly uses a spring force to push the two meshing members to make the torque kinetic energy smoothly. This elastic force is usually derived from an elastic member that has a certain elastic value and can change the elastic value through an adjustment structure. With the elastic value as the critical point, as long as the torque exceeds the critical point, the two engaging members can be forced to separate and interrupt the transmission of the torque, which not only accomplishes the purpose of the workpiece tightening, but also solves the drawback of the screw collapse.

1 shows a conventional first engaging member 10 having a hexagonal block and having a plurality of end portions 11, one of which is planar and trapped in four recesses 12, each recessed portion 12 being between a vertical side 13 and Between a beveled edge 14, a curved surface 15 defining a vertical edge 13 and a beveled edge 14 serves as the bottom of the recess 12.

It is not difficult to understand from Figs. 2 to 4 that the first engaging member 10 is concave-convex with a second engaging member 16 to maintain the concave portion 12 in a meshing relationship with a convex portion 18 which is raised from the end portion 17 of the second engaging member 16. Each convex portion 18 body conforms to the concave portion 12, and the receiving recess portion 12 obliquely 14 transmits the torque of the first engaging member 10, and drives the second engaging member 16 to rotate in the same direction as the first engaging member 10, and the associated workpiece is loosened or Lock the job.

When the second engaging member 16 is blocked from rotating the workpiece, the torque against the oblique portion 14 contacts the convex portion 18 to generate an oblique frictional force, guiding the first engaging member 10 to be displaced along the slope of the convex portion 18 until the end portion 11 touches the convex portion. The arcuate top portion 19 of the portion 18 separates the two engaging members 10 and 16 to interrupt the transmission of torque, and has the effect of one-way tripping.

On the contrary, when the torque of the first engaging member 10 is transmitted to the convex portion 18 through the vertical edge 13, there is no guiding effect, and the second engaging member 16 which is unable to rotate is still strongly forced, and the effect of the torque tripping is not easy. The drawback of causing the screw to collapse. Therefore, this existing technical means obviously does not reach the perfect state.

Figs. 5 and 6 show another conventional first engaging member 20 which is fitted to the second engaging member 21. What is different from the aforementioned technical means is that each recess 22 has a planar bottom 23 that is in a meshing relationship with the projections 25 which are also planar tops 24. The rest of the two engaging members 20, 21 have the same construction as the foregoing technique, and still have the disadvantage of unidirectional tripping and reverse folding.

Fig. 7 shows still another conventional first engaging member 30 which is fitted to the second engaging member 31. The difference from the foregoing technical means is that the convex portion 32 has a first oblique side 33 and a second oblique side 34, and the oblique sides 33, 34 are connected to both sides of the planar top portion 35. Wherein, an angle θ1 between the first oblique side 33 and a reference line L perpendicularly passing through the center of the top portion 35 is formed, and the angle θ1 is equal to an angle θ2 between the reference line L and the second oblique side 34.

Although the second engaging member 31 is blocked from being able to rotate the workpiece, the first engaging member 30 can be separated along one of the two oblique sides 33, 34, thereby generating a bidirectional tripping function, resulting in a completely uniform torque value of the tripping. This effect is not perfect, because the torque required for loosening is often greater than the locking torque, so that the tightened workpiece can be removed, so the two oblique sides 33, 34 have equal angles θ1, θ2, and are removed. It is very unfavorable for homework.

Therefore, how to generate two kinds of mechanisms for the torque tripping performance has become an urgent problem to be solved by the present invention.

In view of this, the inventors delved into the problems of the prior art. With years of experience in research and development and manufacturing of related industries, and actively seeking solutions, the inventors finally succeeded in developing a torque tripping mechanism suitable for tools to improve the use. The problem of the invention.

One of the main purposes of the present invention is to provide a torsion jumping mechanism that combines the effects of two-way tripping and two types of torque tripping.

One of the main objects of the present invention is to provide a tool having the torque tripping mechanism.

For the above object, the torsion jumping mechanism of the present invention comprises: a first engaging member comprising an end portion and a plurality of convex portions raised at the end portions, each convex portion having a first oblique side and a second outer surface a beveled edge, the two beveled edges are a top portion; and a second engaging member includes an end portion and a plurality of recessed portions that are recessed into the end portions, each recess portion forming a contour conforming to the convex portion with the first oblique side and the second oblique side The two beveled gathers are a bottom portion; one of the two engaging members is urged toward the other engaging member by a spring force, so that the convex portions and the concave portions of the shape conform to each other. The elastic force referred to herein is derived from an elastic member such as a spring or a reed.

The first oblique side forms an angle with a reference line extending in the longitudinal direction of the first engaging member and passing through the top, and the included angle is not equal to an angle between the reference line and the second oblique side. Alternatively, the first oblique side forms an angle with a parallel second engaging member in the longitudinal direction and passing through the bottom reference line, and the included angle is not equal to an angle between the reference line and the second oblique side.

Wherein, the angle between the first oblique side and the reference line ranges from 50° to 70°. The first bevel slope is relatively gentle and can only transmit less torque kinetic energy. The force exceeding the elastic force forces the two engaging members to separate, interrupting the delivery of the torque.

Further, the angle between the reference line and the second oblique side is preferably 15 to 35 degrees. The slope of the second bevel is steeper than the first bevel, so that a large torque kinetic energy can be transmitted. Similarly, the force exceeding the elastic force will force the two engaging members to separate, interrupting the transmission of torque.

The present invention provides a tool comprising: the above-mentioned torque tripping mechanism; a gripping member comprising a receiving compartment, the bottom of the receiving compartment supporting the elastic member against the first engaging member, so that the first and second engaging members maintain the fit relationship The receiving compartment wall surface restricts the first engaging member from reciprocating along the length of the gripping member and is not rotatable relative to the gripping member; and a cover body detachably coupled to the gripping member for forming a supply for the receiving compartment The space in which the torque trip mechanism is placed prevents the second engaging member from leaving the receiving compartment.

This tool can be a screwdriver or a wrench. With different angles designed by the torque trip mechanism, the tripping performance with two different torque values is enough to easily complete the workpiece removal operation.

Hereinafter, the objects, structures, and features of the related embodiments will be described in detail based on the drawings, and it is believed that the techniques, means, and effects of the present invention can be obtained from an in-depth and specific understanding.

Please refer to Figure 8 for a combination of a screwdriver 40. The screwdriver 40 has a grip 41 that is held in a tight relationship with the tail of a connector member 50. A cover body 60 is assembled in front of the connecting member 50. A portion of the torsion jumping mechanism 70 is exposed on the outside of the cover body 60 to drive a workpiece (such as a screw) 42 to perform a loosening or locking operation.

The connector 50 has a profile as shown in Figures 9-12, including a buried section 51 and an exposed section 53 of different diameters. The small-diameter embedded section 51 penetrates deep into the gripping member 41 by means of fastening means (e.g., pressing), and the ridge 52 of the outer surface of the embedded section 51 is protruded by four projections to prevent the connecting member 50 from rotating relative to the gripping member 41. The ridge portion 52 extends in the longitudinal direction of the embedded portion 51, and receives the torque of the grip member 41, so that the connecting member 50 rotates in the same direction as the grip member 41, and the torque is transmitted to the exposed portion 53.

The large-diameter exposed section 53 abuts against the grip 41 to limit the depth of the buried section 51. An externally threaded portion 54 is formed in the exposed section 53 and a receiving compartment 55 is recessed therein. The receiving compartment 55 is divided into a restricting portion 56 and a recess 57. The restricting portion 56 is a polygonal wall surface, and one end is adjacent to the exposed portion 53 to form an opening, and the other end is kept in a clear relationship with the recess 57. The groove 57 is surrounded by a wall surface into a circular space, and has a semi-closed groove bottom wall surface which is directly connected to the outside through a circular hole 58 penetrating the embedded portion 51.

As shown in Figs. 13 and 14, the cover body 60 is internally recessed into a large-diameter internal thread groove 61, and the other end is provided with a small-diameter through hole 63 which is maintained in a smooth relationship by a bearing groove 62. The bearing groove 62 has a diameter between the internally threaded groove 61 and the through hole 63.

As shown in FIG. 15, the torsion jumping mechanism 70 is composed of an elastic member 71, a first engaging member 80 and a second engaging member 90, and is partially inserted between the connecting member 50 and the cover 60. A bearing 64 is mounted between the second engaging member 90 and the cover 60. The bearing 64 includes a two-ring piece 65 and a plurality of beads 66. A plurality of bead holes 67 are preset in one of the two ring pieces 65, and the holes are arranged correspondingly. Beads 66.

As shown in Figs. 16 to 18, the first engaging member 80 has a peripheral shape conforming to the restricting portion, and has a polygonal disk shape. The first engaging member 80 has two end portions 81, one of which is defined as a front surface, and a plurality of continuous convex portions 82, such as helical teeth, are raised along the radial direction. The other end portion 81 of the first engaging member 80 is regarded as a back surface, and a short rod 86 is protruded in the axial direction.

The convex portion 82 has a first oblique side 83 and a second oblique side 84. The two oblique sides 83 and 84 are gathered at a top portion 85. The top portion 85 in the figure is a tip end, and may be a flat surface or a curved surface.

In the present embodiment, a reference line L parallel to the longitudinal direction of the first engaging member 80 and passing through the top portion 85 is formed, and an angle θ3 is formed between the reference line L and the first oblique side 83, and the angle θ3 is between 50° and ～ 70°, equivalent to an angular range of 60° ± 10°. At the same time, an angle θ4 is formed between the reference line L and the second oblique side 84, and the angle θ4 is between 15° and 35°, which is equivalent to an angular range of 25°±10°. Therefore, the included angle θ4 is not equal to the included angle θ3.

The second engaging member 90 is a disk body having both end portions 91 as shown in Figs. 19 to 22, and one of the end portions 91 is defined as a front surface of the second engaging member 90, and a plurality of continuous ones are distributed in the radial direction. Concave 92. The second engaging member 90 has a round bar 97 extending in the axial direction from the other end portion 91. The exposed end of the round bar 97 defines a driving end 98.

Two adjacent recesses 92 are spaced apart by a tooth 93. The shape of the tooth 93 conforms to the convex portion, and has a first oblique side 94 and a second oblique side 95. The first beveled edge 94 of the tooth 93 is joined to the second beveled edge 95 of the adjacent tooth 93 to define a contour of the recess 92 that conforms to the aforementioned projection. The two oblique sides 94, 95 are gathered to form a bottom portion 96 which is a pointed tip shape as shown, and may also be a flat or curved surface.

Similarly, drawing a reference line L parallel to the longitudinal direction of the second engaging member 90 and passing through the bottom 96, the reference line L forms an angle θ5 with the first oblique side 94 of the recess 92, and the angle θ5 is between 50° and 70°. , equivalent to an angular range of 60 ° ± 10 °. An angle θ6 is also formed between the reference line L and the second oblique side 95 of the recess 92. The angle θ6 is between 15° and 35°, which corresponds to an angular range of 25°±10°. Therefore, the included angle θ6 is not equal to the included angle θ5.

The driving end 98 is recessed by a polygonal groove 99 to fit the end of the bit or the connecting rod. Of course, the drive end 98 can also be a polygonal projection that is inserted into the corresponding sleeve or the recess of the workpiece.

Next, as seen in Fig. 23, a partial cross-sectional view of the combined screwdriver 40 is shown. The cover 60 in the figure is locked to the externally threaded portion 54 of the connecting member 50 through the internal thread groove 61, and seals the opening of the receiving compartment 55 to form an internal space for accommodating the bearing 64 and the rest of the torsion jumping mechanism 70. . After the cover 60 is removed, the new components can be replaced, and the cover 60 is locked to the connector 50.

The elastic member 71 disposed in the receiving compartment 55 has one end contacting the semi-closed wall surface of the bottom of the recess 57, and the other end abutting against the back surface of the first engaging member 80 to urge the first engaging member 80 to be displaced toward the second engaging member 90, so that The front faces of the engaging members 80, 90 remain in a matching relationship.

The short rod 86 on the back surface of the first engaging member 80 is restrained by the annular sheet-like elastic member 71 to prevent the engaging member 80 from being excessively biased, thereby providing a stable advancement stability effect, and causing the first engaging member 80 to be engaged by the convex portion 82. The two engaging members 90 correspond to the recesses 92. In particular, the periphery of the polygonal shape of the first engaging member 80 is blocked by the wall surface of the restricting portion 56, and can only reciprocate along the longitudinal direction of the grip member 41, but cannot rotate relative to the grip member 41. In other words, the first engaging member 80 transmits the torque originating from the exposed section 53 to the second engaging member 90 as the grip member 41 rotates in the same direction.

The second engaging member 90 is rotatably supported relative to the cover 60 under the support of the round bar 97 partially passing through the through hole 63. The back surface of the second engaging member 90 maintains a point contact relationship with the bearing 64 accommodated in the bearing groove 62, preventing the second engaging member 90 from leaving the receiving compartment 55 while reducing the coefficient of friction. In addition, the driving end 98 of the round bar 97 is exposed outside the cover 60, allowing the opening of the polygonal groove 99 to face the outside.

At the beginning of the unscrewing phase or at the end of the locking phase, the second engaging member 90 is generally prevented from rotating the workpiece, causing the user to grip the grip member 41 to apply a strong torque to counteract the resistance to drive the workpiece to rotate.

It is assumed that when the first oblique edge 83 of the convex portion 82 touches the first oblique side 94 of the concave portion 92, since the slope of the two oblique sides 83, 94 approaches a gentleness, the torque exceeds the kinetic energy of the elastic force, and only the convex portion 82 can be driven. The slope of the two beveled edges 83, 94 exits the recess 92. At this point, the retracted first engaging member 80 engages the wall of the recess 57 of the connecting member 50 to compress the elastic member 71, thereby interrupting the transmission of torque. Therefore, the user can obtain a weak hand feeling from the grip member 41.

Conversely, when the second oblique side 84 of the convex portion 82 contacts the second oblique side 95 of the concave portion 92, the torque of the first engaging member 80 is allowed to be transmitted to the second engaging member 90. Because the slope of the two beveled edges 84, 95 is steeper, the separation of the two engaging members 80, 90 is more difficult to transmit more torque. Although the transmission of the torque is still interrupted, the user gets a strong resistance from the grip 41.

Therefore, the screwdriver 40 of the present embodiment utilizes the torque values of the two types of tripping to solve the drawbacks of the disintegration, and the structure is simple and efficient.

Finally, Figures 24 and 25 are seen to illustrate another embodiment of the screwdriver 43. This screwdriver 43 differs in that only the connecting member 44 maintains a pivotal relationship with the gripping member 41, facilitating the swinging of the connecting member 44 relative to the gripping member 41 to a predetermined angle.

The above examples are merely illustrative of the invention and are not intended to limit the invention. Various changes, modifications, and applications derived from the above-described embodiments will be apparent to those skilled in the art.

[Prior technology]

10. . . First engaging member

11. . . Ends

12. . . Concave

13. . . Vertical side

14. . . hypotenuse

15. . . Curved surface

16. . . Second engaging member

17. . . Ends

18. . . Convex

19. . . top

20. . . First engaging member

twenty one. . . Second engaging member

twenty two. . . Concave

twenty three. . . bottom

twenty four. . . top

25. . . Convex

30. . . First engaging member

31. . . Second engaging member

32. . . Convex

33. . . First hypotenuse

34. . . Second bevel

35. . . top

[this invention]

40. . . screwdriver

41. . . Grip

42. . . Workpiece

43. . . screwdriver

44. . . Connector

50. . . Connector

51. . . Buried section

52. . . Ridge

53. . . Exposed section

54. . . External thread

55. . . Storage compartment

56. . . Restriction department

57. . . Groove

58. . . Round hole

60. . . Cover

61. . . Internal thread groove

62. . . Bearing groove

63. . . Through hole

64. . . Bearing

65. . . Ring piece

66. . . Bead

67. . . Bead hole

70. . . Torque jumping mechanism

71. . . Elastic part

80. . . First engaging member

81. . . Ends

82. . . Convex

83. . . First hypotenuse

84. . . Second bevel

85. . . top

86. . . Short stick

90. . . Second engaging member

91. . . Ends

92. . . Concave

93. . . tooth

94. . . First hypotenuse

95. . . Second bevel

96. . . bottom

97. . . Round bar

98. . . Drive end

99. . . Polygonal slot

L. . . Baseline

Θ1～θ6. . . Angle

Figure 1 is a perspective view of a conventional engagement member.

Figs. 2 to 4 are views showing the continuous operation of the engaging member of Fig. 1.

Figures 5 and 6 are continuous motion diagrams of another conventional engagement member.

Fig. 7 is a view showing a state of use of still another conventional engaging member.

Figure 8 is a plan view showing a first embodiment of the screwdriver of the present invention.

Figures 9 through 11 are front, rear and side cross-sectional views of the connector.

Fig. 12 is a plan view taken along line A-A of Fig. 8.

Figures 13 and 14 are front and side partial cross-sectional views of the cover.

Figure 15 is an exploded plan view of the screwdriver of the present invention.

Figures 16 to 18 are front views and two side views of the first engaging member.

19 to 22 are a front view, a rear view, and two side views of the second engaging member.

Figure 23 is a partial sectional view showing the screwdriver of the present invention.

Figures 24 and 25 are schematic views showing the operation of the second embodiment of the screwdriver of the present invention.

80. . . First engaging member

81. . . Ends

82. . . Convex

83. . . First hypotenuse

84. . . Second bevel

85. . . top

86. . . Short stick

Θ3, θ4. . . Angle

Claims (9)

A torsion jumping mechanism comprises: a first engaging member, comprising: an end portion and a plurality of convex portions raised at the end portions, each convex portion having a first oblique side and a second oblique side, and the two oblique sides are gathered And a second engaging member, comprising: one end portion and a plurality of recessed portions that are trapped in the end portion, each concave portion having a contour conforming to the convex portion; and one elastic force pushing one of the two engaging members closer to the other engaging member to make the convex portion And the corresponding concave portion cooperates with each other; wherein the first oblique side forms an angle with a reference line extending in the longitudinal direction of the first engaging member and passing through the top, the angle is not equal to a line from the reference line to the second oblique side The angle between the two. The torque tripping mechanism according to claim 1, wherein the angle from the first oblique side to the reference line ranges from 50° to 70°, and the angle from the reference line to the second oblique side The range is between 15° and 35°. The torque tripping mechanism of claim 2, wherein the top shape is selected from one of a group consisting of a tip, a plane, and a curved surface. A torsion jumping mechanism comprising: an elastic member; a first engaging member comprising an end portion and a plurality of convex portions raised at the end; and a second engaging member comprising an end portion and a plurality of recessed portions which are recessed into the end portion, Each of the concave portions is formed by a first oblique side and a second oblique side to conform to the contour of the convex portion, and the two oblique side gathers is a bottom portion; the elastic member elastically pushes an engaging member to approach the other engaging member, so that the concave portion corresponds to the corresponding portion The convex portions are in contact with each other; wherein the first oblique side forms an angle with a parallel second engaging member in the longitudinal direction and passing through the bottom reference line, and the included angle is not equal to a distance between the reference line and the second oblique side Angle. A screwdriver, comprising: the torsion jumping mechanism according to claim 1, wherein the elastic force of the pushing engaging member is from an elastic member; and the holding member comprises a receiving compartment, and the bottom of the receiving compartment supports the elastic The first and second engaging members are maintained in a fitting relationship, and the receiving wall surface restricts the first engaging member from reciprocating along the length of the holding member and is not rotatable relative to the holding member; a cover body, The cover body is detachably coupled to the gripping member, and the mating receiving compartment forms a space for the torque jumping mechanism to be inserted, preventing the second engaging member from leaving the receiving compartment. A screwdriver according to claim 5, comprising a connecting member having a buried portion and an exposed portion, the embedded portion being fastened to the holding member to prevent the connecting member from rotating relative to the holding member The receiving compartment is located in the exposed section, and the compartment distinguishes a recess for accommodating the elastic member and a restricting portion for guiding the first engaging member to reciprocate with the elastic member by the wall surface while preventing the first engaging member from opposing the gripping member Turn. The screwdriver according to claim 6, wherein the second engaging member has a front portion having a recess as a front surface, and a round bar partially passing through the cover body protrudes from a rear surface of the second engaging member, the round rod is opposite The cover body is rotatable, and the exposed end of the round bar is defined as a driving end. The screwdriver according to claim 7, wherein the driving end has a concave-convex relationship with one of a group selected from the group consisting of a screwdriver head, a connecting rod and a sleeve. A screwdriver according to claim 5 or 6 or 7, further comprising a bearing disposed between the second engaging member and the inside of the cover.