Novel screwdriver with scratch-proof function

Abstract

The novel screwdriver with the scratch-proof function comprises the screwdriver handle and the replaceable screwdriver head, the design that the limiting sleeve is in linkage with the screwdriver head is adopted, the end of the screwdriver head is always located in the limiting sleeve through elastic constraint of the limiting spring during operation, the screwdriver head is effectively prevented from slipping, and the service life of the screwdriver head is prolonged. And scratches on the surface of equipment or an object are avoided. The limiting sleeve is matched with the outer ring of the bearing, when the limiting sleeve makes contact with the surface of an object, resistance of the limiting sleeve enables the limiting sleeve to be kept in a static state, only the internal screwdriver head rotates along with the inner ring of the bearing, friction between the limiting sleeve and the contact face is avoided, surface abrasion is reduced, and the replaceable function is achieved through modular design. And in cooperation with base fixing screws, quick disassembly and assembly are achieved, all assemblies (such as the tool bit, the limiting sleeve and the bearing) can be replaced independently, and the maintenance cost is remarkably reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to general tool technical field especially, it relates to a novel screwdriver with scratchproof function. BACKGROUND

[0002] As a very common manual operation tool, the flathead screwdriver plays an important role in daily life and various working scenes. Its main function focuses on the operation of flathead screws, and it can achieve the purpose of tightening or loosening the flathead screws through rotating action, providing basic support for many assembly, maintenance and other work.

[0003] However, compared with cross screwdrivers and other types of screwdrivers, the flathead screwdriver has a significant defect. In the matching part of the flathead screwdriver and the flathead screw, there is no stop structure with horizontal limiting function like the cross screwdriver. This structural deficiency leads to the fact that the blade of the flathead screwdriver is prone to slipping during actual use. When the user tries to tighten or loosen the screw, the blade of the screwdriver will slip out of the slot of the screw once the angle or force of the user is slightly off. This slipping not only damages the equipment or surface of the object at the screw installation site, such as scratching the surface during the maintenance of some precision instruments or high-end furniture, affecting their appearance and normal use; moreover, in some specific scenarios, such damage is absolutely not allowed to occur, for example, when repairing cultural relics, even slight scratches on the surface can damage the integrity and historical value of the cultural relics.

[0004] In order to solve this difficult problem, the screwdriver head is usually changed to a magnetic head, and the user needs to manually fix the matching part of the head and the screw during operation. The original intention of the magnetic head design is to use magnetic force to attract the screw, so that the screwdriver can be more stable with the screw to some extent, reducing the possibility of slipping. Manually fixing the matching part is to further enhance the stability of the connection between the screwdriver and the screw through human intervention.

[0005] However, even with such improvements, the actual use effect is still not satisfactory. In actual operation, especially when a larger force is needed to tighten or loosen the screw, the problem of the head slipping off still occurs frequently. Moreover, when the head slips off, the hand is close to the screwdriver during operation, which can easily cause finger injury, causing physical harm and pain to the user, which undoubtedly greatly reduces the safety and reliability of using the flathead screwdriver. INVENTION CONTENTS

[0006] Therefore, the utility model wants to solve the technical problem: how to provide a novel screwdriver with scratch prevention function to avoid the problem that the bit is easy to slip off and damage the important equipment or object surface during use.

[0007] In order to realize the above-mentioned purpose, the utility model provides a novel screwdriver with scratch prevention function, it includes screwdriver handle and replaceable screwdriver bit,

[0008] The screwdriver handle includes: handle grip, connecting rod and adapter interface are formed, both ends of the connecting rod are connected with the handle grip and the adapter interface respectively, the adapter interface is used for connecting the replaceable screwdriver bit, and a polygonal inner cavity is formed in the inside of the adapter interface.

[0009] The replaceable screwdriver bit includes: bit adapter base, limiting spring, bearing, bit, base fixing screw and limiting sleeve.

[0010] The inside of the adapter interface is connected with the end of the bit adapter base, a stepped platform is formed on the bit adapter base, one side of the stepped platform is a first connecting end, the other side of the stepped platform is a second connecting end, one side of the bit is provided with a connecting cavity, the second connecting end is connected in the inside of the connecting cavity, and the end of the second connecting end is connected with the connecting hole arranged on the bit through the base fixing screw, and the connecting cavity is a polygonal inner cavity.

[0011] The limiting spring and the bearing are respectively sleeved on the outer wall of the connecting cavity, one end of the limiting spring abuts against the end face of the stepped platform, the other end of the limiting spring abuts against the end face of the bearing, the limiting sleeve is sleeved on the bit and located in the inside of the limiting sleeve, one end of the limiting sleeve towards the bit adapter base is connected with the outer ring of the bearing, and when the limiting spring is in the non-stressed state, the end of the bit is located in the inside of the limiting sleeve.

[0012] Further, the outer wall of the connecting cavity and the outer wall of the bit form a stepped face, the limiting spring and the bearing are located between the stepped platform and the stepped face, and the movement of the bearing in the axial direction of the bit is limited by the stepped face.

[0013] Further, when the limiting spring is in the compressed state, the end of the bit protrudes from the end of the limiting sleeve.

[0014] Further, the first connecting end and the second connecting end are both prismatic.

[0015] Further, the base fixing screw is assembled along the axial direction perpendicular to the bit.

[0016] Compared with the related art, the novel screwdriver with scratch prevention function has the beneficial effects that: the linkage design of the limiting sleeve and the bit end, the elastic constraint of the limiting spring during operation, the bit end always being inside the limiting sleeve, the effective prevention of the bit end from slipping off, and the avoidance of scratches on the surface of the equipment or object. The limiting sleeve cooperates with the bearing outer ring, the resistance of the limiting sleeve when contacting the surface of the object keeps the limiting sleeve in a stationary state, only the inner bit rotates with the bearing inner ring, the limiting sleeve and the contact surface are avoided from rubbing, the surface abrasion is reduced, the replaceable function is realized through the modular design, the polygonal inner cavity connection of the bit adapter base and the screwdriver bit, the cooperation of the base fixing screw for quick disassembly, the independent replacement of each component (such as the bit, the limiting sleeve, the bearing, etc.), and the significant reduction of the maintenance cost. The design takes into account scratch prevention, wear prevention and economy, and is suitable for high surface protection requirement scenes such as precision equipment maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is a structure schematic view of the novel screwdriver with scratch prevention function in the embodiment of the utility model;

[0018] Figure 2 It is a structure schematic view of the screwdriver handle in the embodiment of the utility model;

[0019] Figure 3 It is an explosion schematic view of the replaceable screwdriver bit in the embodiment of the utility model;

[0020] Figure 4 It is a schematic view of the replaceable screwdriver bit in the embodiment of the utility model under the state that the limiting spring is not stressed;

[0021] Figure 5 It is a schematic view of the replaceable screwdriver bit in the embodiment of the utility model under the state that the limiting spring is stressed and compressed. DETAILED DESCRIPTION

[0022] The utility model will be further explained in detail in combination with the drawings and specific embodiments.

[0023] Please see Figures 1-5 The utility model discloses a novel screwdriver with scratch prevention function, which comprises a screwdriver handle and a replaceable screwdriver bit 3.

[0024] The screwdriver handle comprises a handle grip 1, a handle connecting rod 2 and a handle adapter 4, the two ends of the handle connecting rod 2 are connected with the handle grip 1 and the handle adapter 4 respectively, the handle adapter 4 is used for connecting the replaceable screwdriver bit 3, and a polygonal inner cavity is formed in the handle adapter 4.

[0025] The replaceable screwdriver bit 3 comprises a bit adapter base 3-1, a limiting spring 3-2, a bearing 3-3, a bit 3-5, a base fixing screw 3-4 and a limiting sleeve 3-6.

[0026] The interior of the handle adapter 4 is connected with the end of the bit adapter base 3-1, a stepped platform is formed on the bit adapter base 3-1, one side of the stepped platform is a first connecting end 3-7 and is connected with the interior of the handle adapter 4, the other side of the stepped platform is a second connecting end 3-8, one side of the bit 3-5 is provided with a connecting cavity, the second connecting end 3-8 is connected in the interior of the connecting cavity, and the end of the second connecting end 3-8 is connected with a connecting hole provided on the bit 3-5 through the base fixing screw 3-4, the base fixing screw 3-4 is assembled along the direction perpendicular to the axis of the bit 3-5, the connecting cavity is a polygonal inner cavity, and the first connecting end 3-7 and the second connecting end 3-8 are both prisms.

[0027] The limiting spring 3-2 and the bearing 3-3 are respectively sleeved on the outer wall of the connecting cavity, one end of the limiting spring 3-2 abuts against the end face of the stepped platform, the other end of the limiting spring 3-2 abuts against the end face of the bearing 3-3, the limiting sleeve 3-6 is sleeved on the bit 3-5 and is located in the interior of the limiting sleeve 3-6, and one end of the limiting sleeve 3-6 facing the bit adapter base 3-1 is connected with the outer ring of the bearing 3-3, when the limiting spring 3-2 is in a non-stressed state, the end of the bit 3-5 is located in the interior of the limiting sleeve 3-6, and when the limiting spring 3-2 is in a compressed state, the end of the bit 3-5 protrudes from the end of the limiting sleeve 3-6.

[0028] A stepped surface is formed between the outer wall of the connecting cavity and the outer wall of the bit 3-5, the limiting spring 3-2 and the bearing 3-3 are located between the stepped platform and the stepped surface, and the movement of the bearing 3-3 in the axial direction of the bit 3-5 is limited by the stepped surface.

[0029] The limiting sleeve 3-6 and the bit 3-5 are designed in linkage, the end of the bit 3-5 is always located in the interior of the limiting sleeve 3-6 through the elastic constraint of the limiting spring 3-2 during operation, the bit 3-5 is effectively prevented from slipping off, and scratches on the surface of equipment or objects are avoided. The limiting sleeve 3-6 is matched with the outer ring of the bearing 3-3, when the limiting sleeve 3-6 contacts the surface of an object, the resistance makes the limiting sleeve 3-6 remain in a stationary state, only the bit 3-5 in the interior rotates with the inner ring of the bearing 3-3, the limiting sleeve 3-6 is prevented from rubbing against the contact surface, surface abrasion is reduced, the replaceable function is realized through modular design, the bit adapter base 3-1 and the screwdriver bit are connected through a polygonal inner cavity, and the base fixing screw 3-4 is matched to realize quick disassembly and assembly, and each component (such as the bit 3-5, the limiting sleeve 3-6 and the bearing 3-3) can be independently replaced, and the maintenance cost is significantly reduced. The design takes into account scratch prevention, abrasion prevention and economy, and is suitable for scenes with high surface protection requirements such as precision equipment maintenance.

[0030] The end of the tool bit adapter base 3-1 is a prismatic structure that precisely fits the polygonal inner cavity (square hole) on the small end cylinder of the tool bit 3-5. This polygonal connection not only ensures stable connection in the circumferential direction, preventing relative rotation, but also enables efficient force transmission when transmitting torque. After the adapter base 3-1 is fitted into the square hole of the small end cylinder of the tool bit 3-5, the base fixing screw 3-4 is screwed into the threaded hole along the vertical axis of the tool bit 3-5.

[0031] The fixing screw 3-4 serves a dual fastening function. On the one hand, it tightly secures the tool bit adapter base 3-1 to the tool bit 3-5, ensuring that they do not loosen during use. On the other hand, the vertical assembly method increases the stability of the connection, maintaining the integrity of the structure even when subjected to large torque and external force impacts.

[0032] Limiting spring and bearing assembly: First, the limiting spring 3-2 is fitted into the outer wall of the accommodating cavity of the tool bit 3-5, and then the bearing 3-3 is fitted outside the limiting spring 3-2. The limiting spring 3-2 is a hard spring, and its installation position is between the stepped platform and the stepped surface formed by the outer wall of the tool bit 3-5 and the outer wall of the connecting cavity. When the limiting spring 3-2 is in a non-stressed state, its length allows the end of the tool bit 3-5 to be inside the limiting sleeve 3-6, providing initial limiting. During assembly, it is necessary to ensure that the two ends of the limiting spring 3-2 are tightly abutted on the end face of the stepped platform and the end face of the bearing 3-3, so that when subjected to external compression, it can stably provide elastic recovery force. The inner ring of the bearing 3-3 is in contact with the tool bit 3-5, and the outer ring is only in contact with the limiting sleeve 3-6. This design allows the tool bit 3-5 to rotate freely under the support of the bearing 3-3, while only the tool bit 3-5 can rotate relative to the limiting sleeve 3-6 after contacting the surface of an object, effectively avoiding frictional rotation between the limiting sleeve 3-6 and the contact surface.

[0033] Limiting sleeve assembly: The large end of the limiting sleeve 3-6 is fitted over the outer ring of the bearing 3-3, and the two are tightly fitted to ensure that the limiting sleeve 3-6 can move with the outer ring of the bearing 3-3. The limiting sleeve 3-6 is made of hard plastic, and the end that contacts the surface of the equipment or object is designed with a circular arc on the sleeve edge. This circular arc design can effectively disperse the contact pressure and prevent damage to the contact surface due to stress concentration. In addition, the limiting sleeve 3-6 can be made of transparent material, which allows the operator to directly observe the relative position of the tool bit 3-5 blade edge and the screw slot after assembly is complete, improving the accuracy of the operation.

[0034] During operation, the elastic constraint of the limiting spring 3-2 always keeps the end of the bit 3-5 inside the limiting sleeve 3-6 when the screwdriver contacts the screw. Even if there is hand shaking or uneven force during operation, the limiting sleeve 3-6 can block the bit 3-5 from accidentally sliding out, thereby effectively preventing the bit 3-5 from scratching the surface of the equipment or object. Especially when repairing precision equipment, this scratch-proof design can protect the coating, electronic components, etc. on the surface of the equipment from being damaged, ensuring the normal operation and appearance integrity of the equipment.

[0035] The limiting sleeve 3-6 tightly fits the outer ring of the bearing 3-3, and when the limiting sleeve 3-6 contacts the surface of an object, it remains stationary due to the resistance at the contact point. At this time, only the internal bit 3-5 rotates with the inner ring of the bearing 3-3. This design avoids friction between the limiting sleeve 3-6 and the contact surface, greatly reducing wear on the surface of the object. Compared with traditional screwdrivers, this new screwdriver can better protect the surface of the object and prolong the service life of the object when operating on some objects with relatively fragile surface materials.

[0036] The flat blade of the bit 3-5 has magnetism, which, combined with the limiting action of the limiting sleeve 3-6, can first fix the screw on the screwdriver bit during operation. In this way, when placing the screw into the threaded hole, there is no need to hold the screw with the hand, effectively improving the convenience of operation and reducing operation errors and time waste caused by the falling of the screw. Especially when working in some narrow spaces or inconvenient positions, the advantage of this adsorption fixing function is more obvious. When unscrewing the screw, the screwdriver can also directly adsorb and remove the screw after unscrewing it, further improving the operation efficiency.

[0037] The screwdriver bit 3 is designed as a set of replaceable screwdriver bits of different sizes, which can be used for different sizes of flat head screws, greatly expanding the use range of the screwdriver. At the same time, the screwdriver bit 3 can not only match the general type handle, but also be compatible with the electric tool handle. This modular design allows users to choose the appropriate screwdriver bit for operation in different working scenarios. Moreover, when a certain part of the screwdriver bit 3 is damaged, it can be replaced individually by disassembly, without the need to replace the entire screwdriver bit, significantly reducing the replacement cost and improving the economy and sustainability of the product.

[0038] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some technical features. These modifications or substitutions do not change the essence of the corresponding technical solutions beyond the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A novel screwdriver with anti-scratch function, characterized in that, It includes a screwdriver handle and replaceable screwdriver bits; The screwdriver handle comprises a handle grip, a connecting rod, and an adapter. The two ends of the connecting rod are respectively connected to the handle grip and the adapter. The adapter is used to connect the replaceable screwdriver head. The adapter has a polygonal inner cavity. The replaceable screwdriver bit includes: a screwdriver bit adapter base, a limit spring, a bearing, a screwdriver bit, a base fixing screw, and a limit sleeve; The interior of the adapter is connected to the end of the cutter head adapter base. A stepped platform is formed on the cutter head adapter base. One side of the stepped platform is a first connecting end, and the other side of the stepped platform is a second connecting end. A connecting cavity is provided on one side of the cutter head. The second connecting end is connected to the interior of the connecting cavity, and the end of the second connecting end is connected to the connecting hole provided on the cutter head through the base fixing screw. The connecting cavity is a polygonal inner cavity. The limiting spring and the bearing are respectively sleeved on the outer wall of the connecting cavity. One end of the limiting spring abuts against the end face of the stepped platform, and the other end of the limiting spring abuts against the end face of the bearing. The limiting sleeve is sleeved on the cutter head, and the cutter head is located inside the limiting sleeve. The end of the limiting sleeve facing the cutter head adapter base is connected to the outer ring of the bearing. When the limiting spring is in a non-stressed state, the end of the cutter head is located inside the limiting sleeve.

2. A novel screwdriver with anti-scratch function as described in claim 1, characterized in that, A stepped surface is formed between the outer wall of the connecting cavity and the outer wall of the cutter head. The limiting spring and the bearing are located between the stepped platform and the stepped surface, and the stepped surface restricts the movement of the bearing in the axial direction of the cutter head.

3. A novel screwdriver with anti-scratch function as described in claim 2, characterized in that, When the limiting spring is in a compressed state, the end of the cutter head extends out of the end of the limiting sleeve.

4. A novel screwdriver with anti-scratch function as described in claim 3, characterized in that, Both the first connecting end and the second connecting end are prisms.

5. A novel screwdriver with anti-scratch function as described in claim 3, characterized in that, The base fixing screw is assembled along the axis perpendicular to the cutter head.

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