A manually variable speed screwdriver

Abstract

The utility model discloses a manual speed change screw driver, including first screw driver handle and second screw driver handle, be provided with planetary gear mechanism and overrunning clutch mechanism in the second screw driver handle, and planetary gear mechanism includes planet carrier and second connecting component, and the second connecting component sets up in the planet carrier top, and overrunning clutch mechanism includes the star wheel of joint setting in the second connecting component inside, and the star wheel is connected with the second connecting component and forms the empty slot of meeting place, is provided with the roll column between empty slot, and the lateral spring and movable jacks of keeping connection are provided between the outer wall of roll column and star wheel.

Description

Technical Field

[0001] This utility model relates to the field of screwdriver technology, and more specifically to a manually adjustable speed screwdriver. Background Technology

[0002] A screwdriver is a tool used to turn screws to force them into place. It usually has a thin wedge-shaped head that can be inserted into the slot or notch of the screw head.

[0003] For example, patent CN109834637A discloses a manual planetary gear screwdriver, which consists of a screwdriver handle, a sun gear, a sun gear handle, planet gears, planet gear handles, a gear ring, a gear ring handle, a positioning bead, a positioning spring, a spring cap, a spring bar, a screwdriver handle cover, and a retaining spring. The sun gear, planet gears, and gear ring in the planetary gear mechanism are each made into three interlocking handles. A specially designed screwdriver handle is inserted into the screwdriver handle hole, and the screwdriver handle is combined with the three handles using a positioning device and a spring. The retaining lug on the screwdriver handle engages with the retaining groove in the screwdriver hole. During use, inserting and removing the screwdriver handle and then turning the corresponding handles allows for five speed ratios: constant speed, speed increase, and speed decrease. This design is similar in appearance and size to ordinary manual screwdrivers, with a simple structure, low production cost, and convenient operation.

[0004] In actual operation, the screwdriver can only achieve speed change through the planetary gear set, but it cannot automatically switch between forward and reverse directions, requiring the operator to manually shift gears.

[0005] It is evident that the aforementioned problems with existing technologies urgently need to be addressed. Utility Model Content

[0006] In view of the above-mentioned problems in the prior art, one objective of this utility model is to provide a manually variable speed screwdriver to solve the problems that in the prior art, screwdrivers can achieve the effect of speed change through planetary gear sets, but cannot automatically switch between forward and reverse or normal and variable speed modes.

[0007] To achieve the above objectives, this utility model provides a manually adjustable screwdriver, including a first screwdriver handle and a second screwdriver handle. The second screwdriver handle is provided with a planetary gear transmission mechanism, an overrunning clutch mechanism, and a gear set. The planetary gear transmission mechanism includes a planet carrier and a second connecting component. The second connecting component is disposed on the top of the planet carrier. The overrunning clutch mechanism includes a star wheel that is engaged inside the second connecting component. A slot is formed at the junction of the second connecting component and the star wheel. A roller is disposed between the slots. A slot is formed on the outer wall of the second connecting component near the roller. A spring is engaged in the slot. A spring and a movable top post are arranged laterally between the outer wall of the roller and the star wheel to maintain the connection.

[0008] Preferably, the contact surfaces of the groove and the roller form an angled space, which is smaller than the size of the roller.

[0009] Preferably, the top of the first screwdriver handle is kept horizontal, and the bottom and top of the planetary carrier are respectively fitted with a first gear set and a second gear set, and the outer walls of the first gear set and the second gear set are engaged with the inner wall of the second screwdriver handle.

[0010] Preferably, the top of the first screwdriver handle has a rotating groove, and a first gear set is engaged inside the rotating groove.

[0011] Preferably, the bottom of the second screwdriver handle is engaged between the first gear set and the second gear set.

[0012] Preferably, a retaining plate is centrally located inside the second screwdriver handle, and an abutment groove is provided at the bottom of the retaining plate, which abuts against the second connecting component.

[0013] Preferably, the bottom of the first screwdriver handle is provided with a cutter shaft for centrally engaging with the planetary transmission mechanism and the overrunning clutch mechanism.

[0014] Preferably, a locking block is provided at the top of the cutter shaft, and a top plate is provided at the top of the second screwdriver handle.

[0015] Preferably, the bottom of the cutter shaft has a slot, and a magnet is provided inside the slot.

[0016] Preferably, the second screwdriver handle is provided with teeth and can maintain axial rotation.

[0017] Beneficial effects:

[0018] Compared with the prior art, the manually adjustable speed screwdriver provided by this utility model has the following beneficial effects:

[0019] 1. A spring and a movable top column are provided between the outer wall of the roller and the second connecting part and the outer wall of the star wheel to form an overrunning clutch mechanism, thereby enabling automatic disengagement and engagement.

[0020] 2. By using the planetary speed change mechanism installed in the second screwdriver handle and the first screwdriver handle, when a force is applied to the second screwdriver handle and the first screwdriver handle and there is a speed difference, the speed-increased rotation is input to the roller through the planetary speed change mechanism, and then the roller drives the star wheel to rotate, and then the star wheel drives the cutter shaft to rotate at high speed. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

[0022] Figure 1 A schematic diagram of the structure of a manual variable speed screwdriver provided in an embodiment of this utility model;

[0023] Figure 2 This is a structural schematic diagram of an exploded view of the first embodiment of the manual speed-changing screwdriver provided in this utility model embodiment;

[0024] Figure 3 This is a front cross-sectional view of the first embodiment of the manual speed-changing screwdriver provided in this utility model embodiment;

[0025] Figure 4 This is a schematic diagram of the structure of a second embodiment of a manual speed-changing screwdriver provided in this utility model.

[0026] Figure 5 This is a structural schematic diagram of an exploded view of a second embodiment of a manual speed-changing screwdriver provided in this utility model.

[0027] Figure 6 This is a front cross-sectional view of the second embodiment of the manual speed-changing screwdriver provided in this utility model.

[0028] Key reference numerals:

[0029] 1. Cutting shaft; 2. First screwdriver handle; 3. First gear set; 4. Planetary carrier; 5. Second gear set; 6. Second connecting component; 7. Star wheel; 8. Roller; 9. Spring; 10. Locking block; 11. Locking plate; 12. Abutment groove; 13. Top plate; 14. Rotary groove; 15. Second screwdriver handle; 16. Locking slot; 17. Magnet. Detailed Implementation

[0030] To enable those skilled in the art to better understand the technical solution of this utility model, the present utility model will be further described in detail below with reference to the accompanying drawings.

[0031] like Figure 1-6As shown, a manually adjustable screwdriver includes a first screwdriver handle 2 and a second screwdriver handle 15. A planetary gear transmission mechanism and an overrunning clutch mechanism are provided between the first screwdriver handle 2 and the second screwdriver handle 15. The planetary gear transmission mechanism includes a planet carrier 4, a second connecting part 6, and a gear set. The second connecting part 6 is located on the top of the planet carrier 4. The overrunning clutch mechanism includes a star wheel 7 that is engaged inside the second connecting part 6. A slot is formed at the junction of the second connecting part 6 and the star wheel 7. A roller 8 is provided between the slots. A slot is formed on the outer wall of the second connecting part 6 near the roller 8. A spring 9 is engaged in the slot. A spring 9 and a movable top post are arranged laterally between the outer wall of the roller 8 and the star wheel 7 to maintain the connection.

[0032] The main purpose of this manually adjustable screwdriver is to form an overrunning clutch mechanism through the spring 9 and movable top column set between the outer wall of the roller 8 and the outer wall of the second connecting part 6 and the star wheel 7, so that it can automatically engage and disengage; and through the planetary speed change mechanism set in the second screwdriver handle 15 and the first screwdriver handle 2, when there is a speed difference between the two screwdriver handles, the planetary speed change mechanism can input the increased rotation speed to the roller 8, and then the roller 8 drives the star wheel 7 to rotate, and the star wheel 7 drives the cutter shaft 1 to rotate at high speed.

[0033] In the technical solution provided by this utility model, by Figure 1 , Figure 2 and Figure 3 It can be seen that the contact surface between the slot and the roller 8 forms an angled space. The angled space is smaller than the size of the roller 8. When the star wheel 7 rotates, the roller 8 cannot pass through and gets stuck, causing the overrunning clutch mechanism to jam.

[0034] Furthermore, the top of the first screwdriver handle 2 remains horizontal, and a locking post is provided on the top to engage with the first gear set 3. The first gear set 3 and the second gear set 5 are respectively sleeved on the bottom and top of the planetary carrier 4. The outer walls of the first gear set 3 and the second gear set 5 are engaged with the inner wall of the second screwdriver handle 15.

[0035] In the technical solution provided by this utility model, by Figure 1 , Figure 4 , Figure 5 and Figure 6 It can be seen that the top of the first screwdriver handle 2 is provided with a rotating groove 14, the rotating groove 14 is provided with teeth, and the first gear set 3 is engaged inside the rotating groove 14.

[0036] Furthermore, the bottom of the second screwdriver handle 15 is provided with a locking post to engage the first gear set 3, and the bottom of the second screwdriver handle 15 is engaged between the first gear set 3 and the second gear set 5, and the bottom plate of the second screwdriver handle 15 is detachable and installable.

[0037] In the first and second embodiments, when using the screwdriver, the second screwdriver handle 15 is directly held to tighten the screw. The internal overrunning clutch mechanism will jam, so it is used as a regular screwdriver. The rotation direction of the screwdriver shaft 1 is the same as the rotation direction of the second screwdriver handle 15. When the rotation direction of the second screwdriver handle 15 is the same in both embodiments, the rotation direction of the internal screwdriver shaft 1 in both embodiments remains opposite.

[0038] In the technical solution provided by this utility model, by Figure 1 , Figure 2 , Figure 3 and Figure 4 It is known that a retaining plate 11 is centrally located inside the second screwdriver handle 15, and an abutment groove 12 is provided at the bottom of the retaining plate 11. The abutment groove 12 abuts against the second connecting component 6. The shape of the top of the second screwdriver handle 15 is not limited to horizontal or abutment groove 12, but can also be wavy, as long as it does not obstruct other parts when rotating.

[0039] Furthermore, the bottom of the first screwdriver handle 2 is fitted with a cutter shaft 1 for centered engagement with the planetary transmission mechanism and the overrunning clutch mechanism.

[0040] Furthermore, a locking block 10 is provided at the top of the cutter shaft 1, and a top plate 13 is provided at the top of the second screwdriver handle 15.

[0041] Furthermore, a slot 16 is provided at the bottom of the cutter shaft 1, and a magnet 17 is provided inside the slot 16.

[0042] Furthermore, the second screwdriver handle 15 is equipped with teeth and can maintain axial rotation.

[0043] When using it, operate it with one hand to tighten the screw. Simply hold the second screwdriver handle 15 and rotate it. Because there is resistance from the screw being tightened, the second screwdriver handle 15 can be considered to be stationary. Instead, the resistance from the screw being tightened is transmitted to the central shaft 1 of the screwdriver. The central shaft 1 drives the star wheel 7 of the overrunning clutch mechanism to rotate. Since the distance from one edge of the contact surface between the star wheel 7 and the roller 8 to the outer ring of the overrunning clutch mechanism is less than the diameter of the roller 8, the outer ring can be replaced by the inner wall of the second screwdriver handle 15. Therefore, when the star wheel 7 rotates, the included angle space cannot pass through the roller 8, thus causing the star wheel 7, roller 8, and second screwdriver handle 15 to be in a jammed state. Therefore, rotating the second screwdriver handle 15 can be used as a regular screwdriver.

[0044] When using both hands to tighten screws, one hand holds the first screwdriver handle 2, while the other hand rotates the second screwdriver handle 15. At this time, the planetary transmission mechanism increases the speed of rotation and pushes the roller 8 through the second connecting part 6. The roller 8 pushes the spring 9 and the star wheel 7 to rotate. The star wheel 7 drives the cutter shaft 1 to rotate at high speed, thereby achieving the purpose of tightening screws at high speed.

[0045] The foregoing description only illustrates certain exemplary embodiments of the present invention. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the above drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A manually variable speed screwdriver, characterized by, The device includes a first screwdriver handle (2) and a second screwdriver handle (15). The second screwdriver handle (15) is equipped with a planetary transmission mechanism and an overrunning clutch mechanism. The planetary transmission mechanism includes a planet carrier (4), a second connecting component (6), and a gear set. The second connecting component (6) is located on the top of the planet carrier (4). The overrunning clutch mechanism includes a star wheel (7) that is engaged inside the second connecting component (6). A slot is formed at the junction of the second connecting component (6) and the star wheel (7). A roller (8) is provided between the slots. A slot is provided on the outer wall of the second connecting component (6) near the roller (8). A spring (9) is engaged in the slot. A spring (9) and a movable top post are arranged laterally between the outer wall of the roller (8) and the star wheel (7) to maintain the connection.

2. The manually variable speed screwdriver of claim 1, wherein, The contact surfaces of the groove and the roller (8) form an angled space, which is smaller than the size of the roller (8).

3. The manually variable speed screwdriver of claim 2, wherein, The top of the first screwdriver handle (2) is kept horizontal. The bottom and top of the planetary carrier (4) are respectively fitted with a first gear set (3) and a second gear set (5). The outer walls of the first gear set (3) and the second gear set (5) are engaged with the inner wall of the second screwdriver handle (15).

4. The manually variable speed screwdriver of claim 1, wherein, The first screwdriver handle (2) has a rotating groove (14) at the top, and a first gear set (3) is engaged inside the rotating groove (14).

5. The manually variable speed screwdriver of claim 4, wherein, The bottom of the second screwdriver handle (15) is engaged between the first gear set (3) and the second gear set (5).

6. The manually variable speed screwdriver of claim 1, wherein, A retaining plate (11) is centrally located inside the second screwdriver handle (15). The bottom of the retaining plate (11) is provided with an abutment groove (12), which abuts against the second connecting component (6).

7. The manually adjustable speed screwdriver according to claim 1, characterized in that, The bottom of the first screwdriver handle (2) is fitted with a cutter shaft (1) to engage centrally with the planetary transmission mechanism and the overrunning clutch mechanism.

8. The manually variable speed screwdriver of claim 7, wherein, The top of the cutter shaft (1) is fitted with a locking block (10), and the top of the second screwdriver handle (15) is fitted with a top plate (13).

9. The manually variable speed screwdriver of claim 8, wherein, The bottom of the cutter shaft (1) is provided with a slot (16), and a magnet (17) is provided inside the slot (16).

10. The manually variable speed screwdriver of claim 1, wherein, The second screwdriver handle (15) is provided with teeth and can maintain axial rotation.

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