Micro-motion ratchet wrench

Abstract

The wrench is provided with a main hole, the wall surface of the main hole is concavely provided with a first cambered surface and a second cambered surface which are used for correspondingly forming a first chamber and a second chamber, and the center lines of the first chamber and the second chamber intersect at the circle center of the main hole to keep a set included angle. The main hole is coupled with a ratchet wheel, and the ratchet wheel is provided with an external connection part and external teeth. The first chamber and the second chamber are correspondingly provided with a first latch, a second latch, a first spring and a second spring, the first latch and the second latch are provided with latch teeth, and the first spring and the second spring act on the corresponding first latch and the second latch, so that the latch teeth of the first latch and the second latch can differentially clamp outer teeth of a ratchet wheel through set included angle configuration, and the tooth changing force application angle of the wrench is reduced by half; and when the wrench applies force by any one latch or actuates the ratchet wheel in a backlash manner, the other latch is controlled to be in a suspended non-stress state, so that the operation smoothness is improved.

Description

Technical Field

[0001] The invention relates to a ratchet wrench, in particular to a micro-motion ratchet wrench which can be operated in a narrow environment. Background Art

[0002] The ratchet inside the ratchet wrench has a maximum of 72 teeth based on structural strength requirements. Therefore, by dividing 360° by 72 teeth, we know that the force angle for each ratchet tooth and tooth change is 5°. The 5° tooth change force angle is indeed insufficient when used in a narrow environment. For this reason, some practitioners have developed a ratchet wrench that can reduce the tooth change force angle by half.

[0003] As shown in the Chinese invention patent CN202020672415.4 "ratchet wrench" (US patent application US20210331295A1), a detent groove is provided on the body for installing two parallel detents and a detent assembly. The two detents are respectively connected to the detent assembly through a reset member to provide pre-pressure, so that the teeth of the two detents can obtain a differential detent drive member (ratchet), thereby reducing the tooth change force angle by half. However, the patent has the following deficiencies: 1. Poor operability: The two latches and one latch assembly on the front case are in contact with the wall of the latch groove at any time under the pre-pressure of the two reset parts. When one latch is applying force or idling the driving part, since there is no movable clearance between the other latch and the wall of the latch groove, it will provide a pre-pressure to interfere with the driving part, which will cause the body to get stuck during the switching of force application or idling.

[0004] 2. Difficult assembly: The front case assembly requires sufficient force exerted by the fingers of one hand to clamp the two latches and the latch group horizontally, compress the two reset parts, and allow the distance between the two latches and the latch group to be pressed downward into the latch groove. Subsequently, the other hand is used to operate the driving member to rotate and insert it into the driving hole, and then the assembly is completed sequentially through the teeth of the two latches. The overall assembly is very laborious, and any lack of force will result in failure, making it difficult to improve the overall assembly efficiency.

[0005] 3. Manufacturing is not economical: The previous case reduces one detent slot but adds one detent group, which can hardly reduce manufacturing costs. More importantly, the height of the detent slot for installing two parallel detents needs to be doubled, so the T-shaped tool for processing the detent slot needs to use special specifications, or use general specifications for multiple cuttings, which will either increase the tool cost or significantly increase the working hours. Summary of the invention

[0006] The main content of the present invention is to provide a micro-motion ratchet wrench which can completely solve the shortcomings of the previous case, and has the advantages of easy assembly, economical manufacturing and smooth operation of the wrench, which includes: A wrench with a main hole, wherein the wall surface of the main hole is concave with a first arc surface and a second arc surface, which are used to form a first chamber and a second chamber connected to the main hole respectively; a first center line of the first chamber is controlled to maintain a set angle when intersecting with a second center line of the second chamber at the center of the main hole; A ratchet with an external portion, the outer periphery of which is coupled to the main hole and is provided with n external teeth; the set angle is defined as 360° divided by n, then divided by 2, and finally multiplied by an odd integer greater than 1; Two pawls, each provided with pawl teeth capable of engaging with the outer teeth of the ratchet wheel, the first pawl installed in the first chamber being the first pawl, and the second pawl installed in the second chamber being the second pawl; Two springs, a first spring installed in the first chamber and a second spring installed in the second chamber, are used to act on the corresponding first pawl and second pawl, so that the pawl teeth of the first pawl and the second pawl can differentially engage the outer teeth of the ratchet through the set angle configuration, thereby reducing the force angle of the wrench tooth change by half.

[0007] Furthermore, when the wrench uses the first pawl to apply force or idle to actuate the ratchet, the second pawl is controlled to maintain a movable gap between the second pawl and the second arc surface, so that the second pawl is suspended in the second chamber; when the wrench uses the second pawl to apply force or idle to actuate the ratchet, the first pawl is controlled to maintain the movable gap between the first pawl and the first arc surface, so that the first pawl is suspended in the first chamber.

[0008] Furthermore, the first pawl and the second pawl have a front side matching the outer periphery of the ratchet, and the front side is provided with a pawl tooth that can engage with the outer teeth of the ratchet; the first pawl and the second pawl have a back side opposite to the front side, and the left end of the back side extends to have a left curved surface connected to the left end of the front side, and the right end of the back side extends to have a right curved surface connected to the right end of the front side. Furthermore, the left half of the front side is provided with a latching tooth that can engage with the outer teeth of the ratchet wheel, and the right half of the front side is an escape zone that does not engage with the outer teeth of the ratchet wheel.

[0009] Furthermore, the first chamber and the second chamber are symmetrical in shape, the radius and curvature of the first arc surface and the second arc surface are the same; and the first detent and the second detent are symmetrical in shape.

[0010] Furthermore, the wall surface of the main hole is recessed with a first arc surface and a second arc surface at different heights.

[0011] Furthermore, the wall surface of the main hole is recessed with a first arc surface and a second arc surface at the same height.

[0012] Furthermore, the main hole is provided with a buckle groove for installing a buckle ring, and an inner flange for necking the aperture of the main hole; the ratchet is restricted to the main hole by the buckle ring and the inner flange, so that the ratchet rotates along the wall of the main hole.

[0013] The present invention controls the first and second chambers to maintain a set angle to provide the first and second pawls with differentially engaged ratchet outer teeth, thereby reducing the tooth-changing force angle of the wrench by half, so that the wrench can apply force to rotate the ratchet in a narrow environment to loosen or tighten the sleeve, bolt or nut.

[0014] Furthermore, the overall operation of the present invention is smooth. When the wrench applies force or idles to actuate the ratchet with any one of the pawls, the other pawl is controlled to be in a suspended state without force, so the probability of the two pawls interfering with the ratchet at the same time can be reduced to a minimum, thereby improving the overall operation smoothness.

[0015] Furthermore, the present invention saves effort in assembly. With the help of gravity, one only needs to press down the two detents with the fingers of one hand to easily overcome the two springs, and then use the other hand to install the ratchet to complete the assembly. This assembly technology is equivalent to the existing double-detent ratchet wrench, and the technology is quite mature. It can greatly improve the laborious problem of the previous case, thereby improving the overall assembly efficiency.

[0016] Furthermore, the present invention is in line with manufacturing economic benefits. The present invention does not need to increase the height of the first chamber and the second chamber, so it is only necessary to use a general specification T-shaped cutter to first enter the main hole, and then use a milling machine indexing head or a comprehensive processing machine to control and set the angle θ, so that the first chamber and the second chamber can be easily processed, which is more in line with economic benefits than the previous case. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the decomposition of the present invention.

[0018] Figure 2 1 is a schematic cross-sectional view of the wrench of the present invention (I), to indicate the relative position of the set angle.

[0019] Figure 3 2 is a cross-sectional schematic diagram of the wrench of the present invention, which shows the relative position of the set angle.

[0020] Figure 4 yes Figure 1 Schematic diagram of the local combination of .

[0021] Figure 5 yes Figure 1 Schematic diagram of the combination.

[0022] Figure 6 yes Figure 5 Schematic diagram of the longitudinal section.

[0023] Figure 7 yes Figure 6 The cross-sectional diagram at position AA shows that when the wrench applies force to the ratchet in a clockwise direction, the first pawl is in a locked and stressed state.

[0024] Figure 8 yes Figure 6The cross-sectional diagram of the BB position indicates that when the first pawl is in a locked state under stress, the second pawl is in a suspended state without stress.

[0025] Fig. 9 yes Figure 6 Another cross-sectional diagram at position AA shows that when the wrench applies force clockwise, the first latch is in a suspended state without force.

[0026] Fig.10 yes Figure 6 Another cross-sectional diagram at the BB position shows that when the first pawl is in a suspended state without stress, the second pawl is in a locked state with stress.

[0027] Fig.11 yes Figure 6 Another cross-sectional diagram at the AA position shows that when the wrench is returned counterclockwise, the first latch is in a suspended and unstressed state.

[0028] Fig.12 yes Figure 6 Another cross-sectional diagram at the BB position shows that when the first pawl is in a suspended, unstressed state, the second pawl is in an idle, stressed state.

[0029] Explanation of the accompanying drawings: 10 wrench; 11 rod body; 12 head seat; 13 main hole; 130 center of circle; 14 buckle ring; 141 buckle groove; 15 inner flange; 16 first arc surface; 160 first chamber; 161 first center line; 17 second arc surface; 170 second chamber; 171 second center line; θ setting angle; P1 first active clearance; P2 second active clearance; 20 ratchet; 21 external teeth; 22 external connection part; 30A first pawl; 30B second pawl; 31 front side; 32 back side; 321 left curved surface; 322 right curved surface; 33 pawl; 34 escape area; 40A first spring; 40B second spring. DETAILED DESCRIPTION

[0030] Please see Figures 1 to 12 , the present invention includes: A wrench 10 is provided with a head base 12 connected to one end of a rod body 11. The head base 12 is provided with a main hole 13 that passes through from top to bottom. The top edge of the main hole 13 is provided with a buckle groove 141 for mounting a buckle ring 14. The bottom edge is provided with an inner flange 15 that shrinks the diameter of the main hole 13. The main hole 13 is further recessed with a first arc surface 16 and a second arc surface 17 at different heights toward the rod body 11 to form a first chamber 160 and a second chamber 170 that are connected to the main hole 13. The first chamber 160 and the second chamber 170 are symmetrical in shape, so that the radius and curvature of the first arc surface 16 and the second arc surface 17 are the same, such as Figure 2 and Figure 3As shown, the first chamber 160 and the second chamber 170 maintain a set angle θ, and the set angle θ is defined as the angle at which the first center line 161 of the first chamber 160 and the second center line 171 of the second chamber 170 intersect at the center 130 of the main hole 13; it is particularly noted that the first chamber 160 and the second chamber 170 can be arranged at the same height of the wall of the main hole 13; A ratchet 20 coupled to the main hole 13, with its top surface restricted by the retaining ring 14 and its bottom surface restricted by the inner flange 15, so that the ratchet 20 can rotate along the wall of the main hole 13; the ratchet 20 is provided with an outer tooth 21 with n teeth around the outer circumference, and is concentrically penetrated by an outer connecting portion 22 of a regular hexagonal hole, and the outer connecting portion 22 can be matched with a sleeve, a bolt or a nut for the required loosening or tightening work; the set angle θ is defined as 360˚ divided by n, then divided by 2, and finally multiplied by an odd integer greater than 1; Two pawls, including a first pawl 30A and a second pawl 30B, the first pawl 30A is installed in the first chamber 160, and the second pawl 30B is installed in the second chamber 170; the first pawl 30A and the second pawl 30B have a front side 31 matching the curvature of the outer periphery of the ratchet 20, and a back side 32 opposite to the front side 31; the left half of the front side 31 is provided with a pawl tooth 33 that can mesh with the outer teeth 21 of the ratchet 20, and the right half is defined as an escape zone 34 that does not mesh with the outer teeth 21 of the ratchet 20; the left end of the back side 32 extends to have a left curved surface 321 that connects to the left end of the pawl tooth 33, and the right end extends to have a right curved surface 322 that connects to the right end of the escape zone 34; Two springs include a first spring 40A and a second spring 40B. The first spring 40A is installed in the first chamber 160, and the second spring 40B is installed in the second chamber 170. The first spring 40A and the second spring 40B act on the corresponding first pawl 30A and the second pawl 30B, so that the pawl teeth 33 of the first pawl 30A and the second pawl 30B can differentially engage the outer teeth 21 of the ratchet 20 by setting the angle θ, so as to reduce the tooth change force angle of the wrench 10 by half, so that the wrench 10 can apply force to rotate the ratchet 20 in a narrow environment to loosen or tighten the sleeve, bolt or nut; one end of the first spring 40A and the second spring 40B are positioned on the corresponding first arc surface 16 and the second arc surface 17, and the other end of the first spring 40A and the second spring 40B abuts against the corresponding back side 32 of the first pawl 30A and the second pawl 30B.

[0031] Please see Figure 7 When the wrench 10 drives the first pawl 30A to engage the ratchet 20 and lock the left portion of the first arc surface 16 to apply force to the ratchet 20 clockwise, please cooperate with Figure 8It can be seen that the second pawl 30B will be pulled by the ratchet 20 to swing toward the left part of the first arc surface 16. However, the present invention further controls the second pawl 30B and the second arc surface 17 to maintain a first movable clearance P1, so that the second pawl 30B is suspended in the second chamber 170, and does not directly bear the torque of the wrench 10, but only relies on the first pawl 30A to transmit the torque of the wrench 10. This structure can reduce the interference of the second pawl 30B with the ratchet 20 when the first pawl 30A is engaged with the first arc surface 16, thereby achieving better operation smoothness; because the shapes of the first pawl 30A and the second pawl 30B are corresponding, and a half-tooth differential latching ratchet 20 is formed by setting the angle θ, so as Fig. 9 and Fig.10 As shown, when the wheel is replaced by the second pawl 30B which engages the ratchet 20 and is locked on the second arc surface 17 to transmit the clockwise torque of the wrench 10, a first movable clearance P1 is maintained between the first pawl 30A and the first arc surface 16, so that the first pawl 30A is suspended in the first chamber 160 without being subjected to the torque of the wrench 10.

[0032] Please see Fig.12 When the wrench 10 of the present invention is to be returned counterclockwise to readjust the angle of the force-applying ratchet 20, that is, when the right curved surface 322 of the second pawl 30B acts on the second curved surface 17 to actuate the second pawl 30B tooth 33 to disengage from the ratchet 20, the left curved surface 321 of the second pawl 30B is controlled not to contact the second curved surface 17. Fig.11 As shown, the first pawl 30A engages the ratchet 20, so that a larger second movable clearance P2 is maintained between the left curved surface 321 of the first pawl 30A and the first arc surface 16, so as to provide sufficient space for the subsequent first pawl 30A tooth 33 to disengage from the ratchet 20. Therefore, the first pawl 30A is suspended in the first chamber 160, and it does not directly bear the lost-back torque of the wrench 10. The wrench 10 only relies on the second pawl 30B to transmit the lost-back torque. This structural configuration enables the second pawl 30B to effectively reduce the interference of the first pawl 30A with the ratchet 20 when the second pawl 30B is engaged or disengaged from the second arc surface 17. Similarly, when the first pawl 30A tooth 33 disengages from the ratchet 20 and responds to the lost-back of the wrench 10, it will be replaced by the second pawl 30B suspended in the second chamber 170, so that the second pawl 30B does not directly bear the lost-back torque of the wrench 10, so that the wrench 10 can perform the lost-back operation smoothly.

[0033] The present invention has at least the following advantages: 1. Overall smooth operation: When any one of the pawls of the wrench 10 is used to apply force or to return the ratchet 20, the other pawl is controlled to be in a suspended state without force, so the probability of the two pawls interfering with the ratchet 20 at the same time can be reduced to a minimum, thereby effectively improving the problem of easy jamming and unsmoothness during operation of the previous case.

[0034] 2. Labor-saving assembly: The present invention cooperates with the effect of gravity. It is only necessary to press down the two detents with the fingers of one hand to easily overcome the two springs, and then install the ratchet 20 with the other hand to complete the assembly. This assembly technology is equivalent to the existing double-detent ratchet wrench, and the technology is quite mature. It can greatly improve the labor-intensive problem of the previous case, thereby improving the overall assembly efficiency.

[0035] 3. Comply with manufacturing economic benefits: The present invention does not need to increase the height of the first chamber 160 and the second chamber 170, so it is only necessary to use a general specification T-shaped cutter to first enter the main hole 13, and then use a milling machine indexing head or a comprehensive processing machine to control and set the angle θ, so that the first chamber 160 and the second chamber 170 can be easily processed, which is more economical than the previous case.

[0036] The above is only a preferred embodiment of the present invention and cannot be used to limit the scope of implementation of the present invention. That is, all equivalent changes and modifications made according to the scope of the patent application of the present invention belong to the present invention.

Claims

1. A micro-motion ratchet wrench, characterized in that: include: A wrench with a main hole, wherein the wall surface of the main hole is concave with a first arc surface and a second arc surface, which are used to form a first chamber and a second chamber connected to the main hole respectively; a first center line of the first chamber is controlled to maintain a set angle when intersecting with a second center line of the second chamber at the center of the main hole; A ratchet with an external portion, the outer periphery of which is coupled to the main hole and is provided with n external teeth; the set angle is defined as 360° divided by n, then divided by 2, and finally multiplied by an odd integer greater than 1; Two pawls, each provided with pawl teeth capable of engaging with the outer teeth of the ratchet wheel, the first pawl installed in the first chamber being the first pawl, and the second pawl installed in the second chamber being the second pawl; Two springs, a first spring installed in the first chamber and a second spring installed in the second chamber, are used to act on the corresponding first pawl and second pawl, so that the pawl teeth of the first pawl and the second pawl can differentially engage the outer teeth of the ratchet through the set angle configuration, thereby reducing the force angle of the wrench tooth change by half.

2. The micro-motion ratchet wrench according to claim 1, characterized in that: When the wrench uses the first pawl to apply force or idle back to actuate the ratchet, the second pawl is controlled to maintain a movable gap between the second pawl and the second arc surface, so that the second pawl is suspended in the second chamber; when the wrench uses the second pawl to apply force or idle back to actuate the ratchet, the first pawl is controlled to maintain the movable gap between the first pawl and the first arc surface, so that the first pawl is suspended in the first chamber.

3. The micro-motion ratchet wrench according to claim 2, characterized in that: The first pawl and the second pawl have a front side that matches the outer circumference of the ratchet, and the front side is protruding with pawl teeth that can engage with the outer teeth of the ratchet; the first pawl and the second pawl have a back side opposite to the front side, and the left end of the back side extends to have a left curved surface connected to the left end of the front side, and the right end of the back side extends to have a right curved surface connected to the right end of the front side.

4. The micro-motion ratchet wrench according to claim 3, characterized in that: The left half of the front side is protrudingly provided with a latching tooth that can mesh with the outer teeth of the ratchet wheel, and the right half of the front side is an escape zone that does not mesh with the outer teeth of the ratchet wheel.

5. The micro-motion ratchet wrench according to claim 1, 2, 3 or 4, characterized in that: The first chamber and the second chamber are symmetrical in shape, the radius and curvature of the first arc surface and the second arc surface are the same; the first catch and the second catch are symmetrical in shape.

6. The fine-motion ratchet wrench according to claim 1, 2, 3 or 4, characterized in that: The wall surface of the main hole is concave with a first arc surface and a second arc surface at different heights.

7. The fine-motion ratchet wrench according to claim 1, 2, 3 or 4, characterized in that: The wall surface of the main hole is concave with a first arc surface and a second arc surface at the same height.

8. The micro-motion ratchet wrench according to claim 1, 2, 3 or 4, characterized in that: The main hole is provided with a buckle groove for installing a buckle ring, and an inner flange for necking the aperture of the main hole; the ratchet is restricted in the main hole by the buckle ring and the inner flange, so that the ratchet rotates along the wall of the main hole.

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