A screwdriver

Abstract

The utility model discloses a screwdriver, its technical scheme main points include handle, tool bit, the handle front end is provided with transmission cavity, the transmission cavity is installed with the screwdriver seat that can rotate axially relative to handle, be equipped with transmission mechanism between screwdriver seat and transmission cavity, transmission mechanism includes driving gear and driven gear, driving gear and driven gear can be relative to remove in axial direction to realize engagement and separation, driving gear and driven gear are all crown gear, and the rotation axis of two is collinear with the longitudinal axis of handle. The utility model discloses a crown gear as driving gear and driven gear, and the switching of two kinds of conditions of engagement separation is realized through the control relative distance between two gear, and the normal state is in the separation state, realizes idling, when pressing down, two engagement, namely can deliver the torque, realizes the strong tightening of screw and the high -efficient, the fast reset cycle operation of laborsaving.

Description

Technical Field

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

[0002] Currently, a screwdriver is a manual tool used to tighten or loosen screws. A ratchet screwdriver, in particular, consists of a ratchet housing, ratchet, ratchet pawl, spring, and other components. It allows the user to return to a holding position by simply rotating the handle in the opposite direction after turning the handle to its maximum wrist angle, without needing to remove the screwdriver bit. It is used for everyday tightening and loosening of standard screws, as well as in scenarios requiring a certain torque, such as light assembly and repair work.

[0003] However, the existing technologies mentioned above still have some drawbacks. Due to the limitations of the ratchet structure, existing ratchet screwdrivers cannot provide sufficient torque in forward rotation, reverse rotation, and locked states. When dealing with large-sized, rusted screws or high-intensity operations, they are prone to slippage and lack of tightening power. At the same time, adding an extra bit box will significantly increase the complexity of the mechanism and affect the grip. Utility Model Content

[0004] In view of the shortcomings of the existing technology, the present invention provides a screwdriver.

[0005] To achieve the above objectives, this utility model provides the following technical solution: It includes a handle and a cutting head. A transmission cavity is provided at the front end of the handle. A screwdriver holder that can rotate axially relative to the handle is installed inside the transmission cavity. A transmission mechanism is provided between the screwdriver holder and the transmission cavity. The transmission mechanism includes a driving gear and a driven gear. The driving gear and the driven gear can move relative to each other axially to achieve meshing and disengagement. Both the driving gear and the driven gear are crown gears, and their rotation axes are collinear with the longitudinal axis of the handle.

[0006] The present invention is further configured such that: the tail of the handle is provided with a storage cavity, and a storage structure for storing the blade is installed in the storage cavity; the handle is provided with an opening connecting the transmission cavity and the storage cavity, and a column is installed in the opening; the end of the column near the transmission cavity is provided with an installation protrusion.

[0007] The present invention is further configured such that: an elastic body is provided between the screwdriver holder and the bottom wall of the transmission cavity, and a retaining ring is provided near the end of the transmission cavity; the two ends of the elastic body respectively abut against the mounting protrusion and the screwdriver holder; the driving gear is rigidly connected to the transmission cavity, and the screwdriver holder is rigidly connected to the driven gear.

[0008] The present invention is further configured such that: the storage structure includes a tail cap detachably connected to the tail end of the handle, a hollow tail rod is fixedly connected to the inner side of the tail cap, the inner diameter of the tail rod is adapted to the column rod, and the tail rod is provided with a tool holder for storing the blade head.

[0009] The present invention is further configured such that: the column rod is provided with annular slots near both ends, and the tail rod is provided with a tail seat at the end away from the tail cover, and the tail seat is provided with at least two snap rings that can be inserted into the slots.

[0010] The present invention is further configured such that the outer surface of the hand-held portion of the handle is covered with an insulating layer.

[0011] In summary, this utility model has the following beneficial effects:

[0012] 1. By using the crown gear as the driving and driven gears, and under the action of the elastic body, the two gears are usually in a separated state, achieving free rotation; when pressed down, the two mesh, and torque can be transmitted; the effect of high torque rigid transmission and zero resistance free rotation is achieved, realizing the powerful tightening of screws and efficient, labor-saving, and rapid reset cycle operation.

[0013] 2. Through the limiting structure of the tailstock and the retaining ring groove, the axial limiting and anti-dislodgement effect and circumferential free rotation effect are achieved, so that when the tail cover is used as a palm rest, it can smoothly cooperate with the palm rotation, providing a more comfortable and easier operating experience. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0015] Figure 2 This is a schematic diagram of the transmission structure in operation in this embodiment;

[0016] Figure 3 This is a schematic diagram of the working state of the storage structure in this embodiment;

[0017] Figure 4 This is a magnified view of part A in this embodiment;

[0018] Reference numerals: 1. Handle; 11. Insulating layer; 2. Transmission cavity; 21. Screwdriver holder; 211. Driven gear; 22. Driving gear; 23. Elastomer; 24. Retaining ring; 3. Storage cavity; 31. Tail cap; 32. Tail rod; 321. Tool holder; 33. Tail base; 331. Snap ring; 4. Column; 41. Mounting protrusion; 42. Groove. Detailed Implementation

[0019] The present invention will be further described in detail below with reference to the accompanying drawings.

[0020] This embodiment discloses a screwdriver, such as Figures 1 to 2 As shown, the screwdriver includes a handle 1 and a screwdriver head. A transmission cavity 2 is provided at the front end of the handle 1. A screwdriver holder 21, which can rotate axially relative to the handle 1, is installed within the transmission cavity 2. A transmission mechanism is provided between the screwdriver holder 21 and the transmission cavity 2. This transmission mechanism is responsible for converting the user's rotational force on the handle 1 into a bidirectional tightening or loosening action of the screwdriver head mounted on the screwdriver holder 21. The transmission mechanism includes a driving gear 22 and a driven gear 211. The driving gear 22 and the driven gear 211 can move relative to each other axially to achieve meshing and disengagement. Both the driving gear 22 and the driven gear 211 are crown gears, and their rotation axes are collinear with the longitudinal axis of the handle 1. The crown gears possess excellent coaxial transmission capability, fully utilizing the cylindrical space of the screwdriver shaft to effectively transmit the rotational force of the handle 1 to the screwdriver holder 21, thereby providing efficient power to the screwdriver head mounted on the screwdriver holder 21. Its transmission path is short and energy loss is small. The overall structure adopts a coaxial design, and all rotating parts move around the same axis. The structure is symmetrical and the force flow is directly transmitted. There is no eccentric force, which effectively avoids vibration and noise caused by eccentric movement, and makes the user feel more comfortable and stable.

[0021] Further improvements include the addition of pointed teeth and radial tooth roots to the teeth of both the driving gear 22 and the driven gear 211. The pointed teeth are small-radius outward-convex structures located at the ends of the flat meshing surfaces, guiding the driving and driven teeth to align precisely. Their sharp tooth profile and shallow meshing depth result in rapid and sensitive engagement and disengagement, leading to faster response during reversal, a smaller idle angle, and improved handling. The radial tooth roots have an arc-shaped profile and are located at the connection between the teeth and the gear body, reducing stress concentration. This optimized tooth design allows the gears to withstand repeated impact loads, making them more durable.

[0022] like Figures 3 to 4 As shown, the handle 1 has a storage cavity 3 at its tail, and a storage structure for storing cutting heads is installed in the storage cavity 3. The storage structure is used to store cutting heads of different specifications for easy access. The handle 1 has an opening connecting the transmission cavity 2 and the storage cavity 3. A column rod 4 is installed in the opening. The column rod 4 is made of a hard material, preferably metal in this embodiment. The storage structure is connected to the column rod 4 during installation. The column rod 4 provides a track for the movement of the storage structure, making the movement trajectory of the storage structure stable and reliable, and avoiding shaking. The column rod 4 has a mounting protrusion 41 near the end of the transmission cavity 2. The mounting protrusion 41 can contact the bottom of the transmission cavity 2, thereby restricting the movement of the column rod 4 towards the tail of the handle 1. The connection between the storage structure and the column rod 4 restricts the axial displacement of the column rod 4 in another direction. Through this bidirectional constraint, the column rod 4 is completely fixed in the axial direction, thereby effectively preventing the storage structure from falling out. The column rod 4 can be assembled through the opening, reducing the processing difficulty of the overall structure.

[0023] In a further improvement, an elastic body 23 is provided between the screwdriver holder 21 and the bottom wall of the transmission cavity 2, and a retaining ring 24 is provided near the end of the transmission cavity 2; the two ends of the elastic body 23 respectively abut against the protrusion 41 and the screwdriver holder 21, and the elastic body 23 is preferably a spring in this embodiment; the driving gear 22 is rigidly connected to the transmission cavity 2, and the screwdriver holder 21 is rigidly connected to the driven gear 211. The transmission structure has two motion states: transmission and idle. When the operator uses it, they will naturally apply a downward pressure towards the screw. This downward pressure compresses the elastic body 23 behind the screwdriver holder 21, causing the driven gear 211, which is rigidly connected to the screwdriver holder 21, to move forward axially and engage with the driving gear 22 fixed on the transmission cavity 2, thus entering the transmission state. At this time, regardless of whether the ratchet mechanism is set to forward or reverse rotation, the rotational force of the driving gear 22 can be directly transmitted to the driven gear 211 through the meshing gear, thereby driving the screw. When it is necessary to quickly return the handle 1 for the next tightening, the user will subconsciously reduce the downward pressure. After the downward pressure is reduced, the compressed elastic body 23 pushes the screwdriver holder 21 and the driven gear 211 to return to their axial position, causing the driven gear 211 to disengage from the driving gear 22, thus entering the idle state. At this time, no matter how the driving gear 22 is rotated, the power cannot be transmitted to the driven gear 211, and the screwdriver head remains stationary. The idling state achieves true free-running with almost no resistance, reducing fatigue and improving efficiency. Simultaneously, the gears are completely disengaged during idling, and the ratchet mechanism itself does not participate in the idling process, avoiding frequent impacts and friction between the teeth, reducing wear, increasing service life, and minimizing noise. The retaining ring 24 is an annular plate with an opening, and the transmission cavity 2 is provided with a corresponding mounting groove. The retaining ring 24, through its opening, allows for sufficient deformation for easy and convenient installation into the mounting groove. The retaining ring 24 also limits the excessive outward movement of the screwdriver holder 21 under the action of the elastic body 23, preventing it from falling out.

[0024] Further improvements include a storage structure comprising a tail cap 31 detachably connected to the end of the handle 1. A hollow tail rod 32 is fixedly connected to the inner side of the tail cap 31. The inner diameter of the tail rod 32 is adapted to the column rod 4. The tail rod 32 is provided with a tool holder 321 for storing the cutting head. The tail rod 32 and the column rod 4 cooperate to form an axially telescopic structure. In use, the tail cap 31 can be easily and conveniently inserted and removed. The tool holder 321 is installed on the tail rod 32. When the tail cap 31 is in the pulled-out state, the tool holder 321 will display the installed cutting head as the tail cap 31 is pulled out, making it simple and convenient to access the cutting head.

[0025] Further improvements include annular slots 42 near both ends of the column rod 4, and a tailstock 33 at the end of the tail rod 32 away from the tail cap 31. The tailstock 33 has at least two retaining springs 331 that can engage with the slots 42. The tailstock 33, through the retaining springs 331 and the slots 42, forms an axial limit. When the tailstock 33 is opened to pick up or put away the cutting head, the retaining springs 331 clamp the slots 42 near the outer end, preventing the tailstock 33 from falling out. In the retracted state, the retaining springs 331 engage with the slots 42 near the inner side, making it difficult for the tailstock 33 to dislodge. While the slots 42 and retaining springs 331 restrict the axial position of the tailstock 33, the tailstock 33 can rotate circumferentially when the retaining springs 331 clamp the slots 42, allowing the retracted tailstock 33 to rotate relative to the handle 1. This makes operation smoother by simply pressing the tailstock 33 with the palm of the hand to rotate the handle 1.

[0026] Furthermore, the handle 1 has an insulating layer 11 covering its outer surface. The insulating layer 11 prevents accidental electric shock and provides basic safety for electricians or personnel working in energized environments. The insulating layer 11 is typically made of rubber or plastic, and usually has a soft texture, which increases friction and provides a more comfortable and non-slip gripping experience.

[0027] Working principle of this utility model

[0028] During assembly, first, insert the column rod 4 through the transmission cavity 2 into the through hole, then place the elastic body 23 into the transmission cavity 2, where it contacts the column rod 4. Next, install the screwdriver holder 21 into the transmission cavity 2, and then install the retaining ring 24, completing the transmission mechanism installation. Then, turn the handle 1 to rotate, install the tool holder 321 onto the tail rod 32, and install the tailstock 33 so that it and the tail cover 31 abut against both sides of the tool holder 321, forming a stable clamp. Finally, insert the assembled tail cover 31 into the corresponding position at the end of the handle 1, so that the tail rod 32 and the column rod 4 cooperate with each other. The retaining spring 331 on the tailstock 33 cooperates with the slot 42 near the inner side of the column rod 4, thus completing the overall assembly.

[0029] To use, remove the tail cap 31, take a suitable screwdriver bit from the tool holder 321, insert the bit into the screwdriver holder 21 at the front of the screwdriver, push the tail cap 31 back, align the bit with the screw, press the tail cap 31 with your palm, and apply downward pressure to the screw. This downward pressure will engage the driven gear 211 with the driving gear 22. Turning the handle 1 will transmit power to the screwdriver bit, causing the screw to rotate. After one tightening action, the user only needs to slightly lift their palm to reduce the downward pressure on the tail cap 31. The internal elastic body 23 will immediately push the gears away, allowing the transmission to enter freewheeling mode. At this point, the handle 1 can be easily rotated back to the starting position. Pressing down and turning the handle 1 again will continue the next tightening action.

[0030] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions, improvements, etc., made within the design concept of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A screwdriver, comprising a handle (1) and a cutting head, characterized in that: The front end of the handle (1) is provided with a transmission cavity (2), and a screwdriver holder (21) that can rotate axially relative to the handle (1) is installed in the transmission cavity (2). A transmission mechanism is provided between the screwdriver holder (21) and the transmission cavity (2). The transmission mechanism includes a driving gear (22) and a driven gear (211). The driving gear (22) and the driven gear (211) can move relative to each other in the axial direction to achieve meshing and disengagement. The driving gear (22) and the driven gear (211) are both crown gears, and their rotation axes are collinear with the longitudinal axis of the handle (1).

2. The screwdriver according to claim 1, characterized in that: The handle (1) has a storage cavity (3) at its tail, and a storage structure for storing the cutting head is installed in the storage cavity (3); the handle (1) has an opening that connects the transmission cavity (2) and the storage cavity (3), and a rod (4) is installed in the opening; the rod (4) has an installation protrusion (41) near the end of the transmission cavity (2).

3. A screwdriver according to claim 2, characterized in that: An elastic body (23) is provided between the screwdriver holder (21) and the bottom wall of the transmission cavity (2), and a retaining ring (24) is provided near the end of the transmission cavity (2); the two ends of the elastic body (23) respectively abut against the mounting protrusion (41) and the screwdriver holder (21); the driving gear (22) is rigidly connected to the transmission cavity (2), and the screwdriver holder (21) is rigidly connected to the driven gear (211).

4. A screwdriver according to claim 3, characterized in that: The storage structure includes a tail cap (31) detachably connected to the tail end of the handle (1), a hollow tail rod (32) is fixedly connected to the inner side of the tail cap (31), the inner diameter of the tail rod (32) is adapted to the column rod (4), and the tail rod (32) is provided with a tool holder (321) for storing the cutting head.

5. A screwdriver according to claim 4, characterized in that: The column (4) has annular slots (42) near both ends. The tail rod (32) has a tail seat (33) at the end away from the tail cover (31). The tail seat (33) has at least two snap rings (331) that can be inserted into the slots (42).

6. A screwdriver according to claim 1, characterized in that: The handle's hand-held portion is covered with an insulating layer (11).

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