A PC case and a hand screw with adjustable force arm

Abstract

The present invention discloses a PC case and a hand screw with an adjustable force arm. The hand screw with an adjustable force arm comprises a screw body and a cap-shaped handle fixed to the outer periphery of the head of the screw body; the periphery of the cap-shaped handle is provided with a handle that can be rotated to open and close relative to the handle. The hand screw with an adjustable force arm meets the requirements of automated assembly, and when the tightening torque of the automatic fastening installation is large, it is convenient for customers to complete the removal of the hand screw by hand with a smaller driving force by adjusting to increase the force arm of the hand screw, thereby improving the user experience and not occupying additional installation space.

Description

Technical Field

[0001] The present invention relates to the technical field of chassis assembly, and in particular to a hand screw with an adjustable force arm. The present invention also relates to a PC chassis using the hand screw with an adjustable force arm. Background Art

[0002] As customers have put forward more requirements for tool-free disassembly of chassis, our company's PC chassis side covers widely use hand screws, which include screws and cap-shaped handles fixed with the screws. Due to the large number of models and the pursuit of high efficiency in production, electric screwdrivers are still used for locking, resulting in tight locking during assembly and difficulty in manual disassembly for the first time. When the locking torque is adjusted to a small value, it is easy to fall off during vibration testing. Therefore, we can only ask customers to use screwdrivers for disassembly for the first time, and then manual tightening and manual disassembly can be performed later, which brings certain inconvenience to customers.

[0003] Therefore, how to improve the convenience of tool-free removal of chassis locking screws and improve user experience has become a technical problem that technical personnel in this field need to solve. Summary of the invention

[0004] The object of the present invention is to provide a hand screw with an adjustable lever arm, which can be adjusted to increase the lever arm, making it easier for customers to disassemble the hand screw without tools, improving the user experience, and the hand screw does not occupy additional installation space. Another object of the present invention is to provide a PC case including the above-mentioned arm screw with an adjustable lever arm.

[0005] To achieve the above object, the present invention provides a hand screw with an adjustable force arm, comprising a screw body and a cap-shaped handle fixedly mounted on the periphery of the head of the screw body; the periphery of the cap-shaped handle is provided with a handle that can be rotated relative to it to open and close.

[0006] Optionally, the handle is opened and closed by rotation in a plane perpendicular to the axial direction of the screw body, and the handle at least includes a handle whose rotation opening direction is opposite to the thread direction of the screw body.

[0007] Optionally, the handles are arranged in multiple groups, and the multiple groups of handles are rotationally symmetrically arranged around the axis of the screw body.

[0008] Optionally, the cap-shaped handle is injection-molded and bonded to the screw body as a whole.

[0009] Optionally, the handle is in the shape of a magatama, and the cap-shaped handle is provided with a receiving groove that cooperates with the handle, and also includes a rotating shaft parallel to the screw body and fixed in the receiving groove. The handle is rotatably connected to the cap-shaped handle via the rotating shaft. When the handle is rotated to retract into the receiving groove, the handle and the cap-shaped handle cooperate to form a cylindrical structure.

[0010] Optionally, the outer periphery of the screw body is provided with positioning ribs protruding along its radial direction.

[0011] Optionally, the positioning ribs are symmetrically arranged in two groups and also include a limiting plate for the screw body to pass through, the limiting plate is fitted on the bottom of the cap-shaped handle, and the upper end surface of the limiting plate is provided with a hook connected to the positioning rib.

[0012] Optionally, the limiting plate is provided with a positioning hole which cooperates with the rotating shaft in a one-to-one positioning manner, the top end of the rotating shaft is hot-melt connected to the cap-shaped handle, and the bottom end of the rotating shaft is immersed in the positioning hole.

[0013] Optionally, the handle is provided with a convex rib on the inner end surface of the accommodating groove, and the cap-shaped handle is provided with a convex rib groove on the inner end surface of the accommodating groove for forming the convex rib, and when the handle is rotated to retract into the accommodating groove, the convex rib falls into the convex rib groove.

[0014] Optionally, it also includes a sleeve that is sleeved on the outer circumference of both the cap-shaped handle and the handle.

[0015] The present invention further provides a PC case, comprising a case body, a case side cover and a hand screw with an adjustable force arm as described in any one of the above items for locking the case body and the case side cover.

[0016] Compared with the above-mentioned background technology, the present invention aims at the problem that during the assembly process of PC case, the screws are tightened by automated production line, the initial torque of the screws is large, and it is difficult to disassemble them without tools for the first time. The present invention provides a thumb screw with an adjustable lever arm. The thumb screw adopts a folding lever arm and is provided with a handle that can be rotated to open and close relative to a cap-shaped handle. By opening the handle, the lever arm of the thumb screw is increased, which makes it convenient for customers to disassemble the thumb screw with a smaller driving force. By rotating and retracting the handle, the installation size of the thumb screw is avoided from increasing, which not only meets the needs of automated installation, but also does not change the existing packaging method and consumables, and does not need to occupy additional PC case installation space. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without paying creative work.

[0018] Figure 1 An exploded view of a hand screw with an adjustable lever arm provided in an embodiment of the present invention;

[0019] Figure 2 It is a visual diagram of the handle of the hand screw of the adjustable force arm in the open state;

[0020] Figure 3 It is a cross-sectional view of the handle of the hand screw of the adjustable force arm in the open state;

[0021] Figure 4 It is a cross-sectional view of the handle of the hand screw of the adjustable force arm in the retracted state;

[0022] Figure 5 for Figure 1 Assembly view of the center limit plate.

[0023] in:

[0024] 1- screw body, 2- cap-shaped handle, 3- shaft, 4- handle, 5- limit plate;

[0025] 11-positioning rib, 21-accommodating groove, 41-convex rib, 51-hooking. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In order to enable those skilled in the art to better understand the scheme of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific implementation methods.

[0028] Please refer to Figures 1 to 5 , Figure 1 An exploded view of a hand screw with an adjustable lever arm provided in an embodiment of the present invention, Figure 2 This is a visual diagram of the handle of the hand screw of the adjustable lever arm in the open state. Figure 3 This is a cross-sectional view of the handle of the hand screw of the adjustable lever arm when it is open. Figure 4 This is a cross-sectional view of the handle of the hand screw of the adjustable lever arm when it is retracted. Figure 5 for Figure 1 Assembly view of the center limit plate.

[0029] The hand screw with adjustable lever arm provided by the present invention adjusts the lever arm of the hand screw by setting a handle 4 that rotates and opens on the cap-shaped arm, thereby maintaining the inherent size of the hand screw, rather than simply increasing the outer diameter of the cap-shaped handle 2, thereby meeting the use requirements of automated assembly tools and preventing the hand screw from exceeding the assembly width of the PC chassis. When a customer needs to disassemble the hand screw with adjustable lever arm for the first time, he only needs to rotate and open the handle 4 to increase the lever arm of the hand screw, and can disassemble the screw by hand with a smaller driving force, thereby improving the customer's user experience. Before packaging and shipment, and when not in use, the handle can be returned to its original position to ensure that no extra space is taken up and there is no need to change packaging consumables.

[0030] Please refer to Figure 1 In the specific embodiment provided by the present invention, the hand screw with adjustable force arm includes a screw body 1, a cap-shaped handle 2 and a handle 4, wherein the screw body 1 and the cap-shaped handle 2 are fixedly connected as one body, so that when the cap-shaped handle 2 is driven to rotate, the screw body 1 can rotate synchronously with the cap-shaped handle 2. The handle 4 is rotatably connected to the cap-shaped handle 2, and can increase the force arm of the cap-shaped handle 2, that is, the screw body 1, when rotating to open, and does not increase the overall size of the product when rotating to retract. The screw body 1 includes a cross head or a flat head, a screw rod and a screw thread / thread opened at the bottom of the screw rod. The screw body 1 is integrally cold-forged and made of carbon steel to ensure that it can be magnetically attracted so that the electric screwdriver can adsorb and install it. The cap-shaped handle 2 adopts an injection molding process. After molding, the cap-shaped handle 2 is embedded with the screw body 1 and preferably bonded to form a whole by glue. In order to realize the rotation opening and retraction of the handle 4 relative to the cap-shaped handle 2, the cap-shaped handle 2 is provided with a receiving groove 21 and a rotating shaft 3 is arranged in the receiving groove 21, and the handle 4 is rotatably connected with the cap-shaped handle 2 through the rotating shaft 3. When the handle 4 is rotated to be retracted into the accommodating groove 21 , the outer end surface of the handle 4 is flush with the outer contour of the cap-shaped handle 2 or is located within the outer contour of the cap-shaped handle 2 .

[0031] Please refer to further Figures 2 to 4In the preferred embodiment provided by the present invention, the handle 4 is provided in multiple groups, preferably in two groups. In this embodiment, the handle 4 can be rotated and opened and closed along a plane perpendicular to the axial direction of the screw body 1. The two groups of handles 4 are arranged 180° rotationally symmetrically with the axis of the screw body 1 or the cap-shaped handle 2. The shape of a single handle 4 (specifically, the cross-sectional shape) is in the shape of a magatama or a Tai Chi Yin / Yang fish, including a larger head and an arc-shaped tail that is bent and gradually shrinks to the same side. The head is generally circular, and the rotating shaft 3 is rotated to connect the center of the head of the handle 4. The shape of the receiving groove 21 is adapted to the shape of the handle 4, that is, the cross-section of the receiving groove 21 is also in the shape of a magatama, and the thickness of the handle 4 is equal to or slightly smaller than the height of the receiving groove 21. When the handle 4 is rotated to retract the receiving groove 21 of the cap-shaped handle 2, the handle 4 and the cap-shaped handle 2 cooperate to form a cylindrical structure. When the handle 4 is rotated out of the receiving groove 21 and is in an open state, the tail of the handle 4 can be driven by the finger to complete the removal of the hand screw. That is, the rotation direction of the handle 4 during the opening process is opposite to the thread rotation direction of the screw body 1 .

[0032] Based on the above understanding, a second accommodating groove and a second handle rotatably connected to the second accommodating groove can also be set on the periphery of the cap-shaped handle 2 with reference to the structure of the handle 4. The rotation and opening direction of the second handle is the same as the thread direction of the screw body 1. The second handle can be used to tighten the hand-tightened screw with an adjustable force arm.

[0033] In addition, the hand screw with adjustable force arm provided by an embodiment of the present invention is further provided with a locking mechanism for fixing the handle 4 and the cap-shaped handle 2 relatively when the handle 4 is opened, so that there is no need to limit the relationship between the rotation direction of the handle 4 opened and the thread direction of the screw body 1. After the handle 4 is opened, it can be used not only for disassembly of the hand screw, but also for tightening the hand screw. The locking mechanism can adopt a locking groove and a locking protrusion matching mode. For example, the thickness of the handle 4 is less than the height of the receiving groove 21, and the handle 4 can slide up and down along the rotating shaft 3. The locking protrusion can be arranged on the upper end surface of the handle 4, and the locking groove can be opened at a corresponding position of the top wall surface of the receiving groove 21. When the handle 4 is rotated and opened, the handle 4 is moved up along the rotating shaft 3, and the locking protrusion falls into the locking groove, thereby realizing the fixation of the handle 4. At this time, the handle 4 can be used to loosen or tighten the screw body 1. The locking protrusion can also be arranged on the top wall surface of the receiving groove 21, and the locking groove is correspondingly arranged on the upper end surface of the handle 4. The locking protrusion and the locking groove are matched in shape, and the locking protrusion can adopt a prismatic structure or a cylindrical structure.

[0034] The handle 4 can be set as follows Figure 2 and Figure 3 The illustrated rotation opening and closing along the radial plane of the screw body 1 can also be set to be rotation opening and closing along a plane parallel to the axial direction of the screw body 1. In this case, the rotation opening and closing direction of the handle 4 is different from the tightening and loosening direction of the screw body 1, and the handle 4 can achieve the loosening and tightening of the driving screw body 1 without providing a locking mechanism.

[0035] The rotating shaft 3 is made of stainless steel. In order to fix the rotating shaft 3 to the cap-shaped handle 2, a blind hole is provided on the top wall of the receiving groove 21. The rotating shaft 3 is press-fitted into the blind hole of the cap-shaped handle 2 by hot melting, and is fixed after cooling. A positioning rib 11 is provided above the threaded end of the screw body 1 and is convex in the radial direction. The positioning rib 11 is usually symmetrically arranged. The positioning rib 11 is used to further position the screw body 1 and the cap-shaped handle 2 in the circumferential direction to prevent the two from rotating in the circumferential direction, so that the screw body 1 can be tightened or removed with the help of the cap-shaped handle 2.

[0036] In order to further improve the reliability of fixing the rotating shaft 3, the hand screw with an adjustable force arm provided in the embodiment of the present invention further includes a limit plate 5, which has a through hole. The bottom of the screw body 1 passes through the through hole of the limit plate 5. The limit plate 5 is against the lower end surface of the cap-shaped handle 2 and is fixed to the cap-shaped handle 2. The limit plate 5 has a positioning hole. After the limit plate 5 is fixed to the cap-shaped handle 2, the bottom end of the rotating shaft 3 is just placed in the positioning hole. When the handle 4 is set to two groups, that is, the rotating shaft 3 is set to two groups, the limit plate 5 has two groups of positioning holes. The two ends of the rotating shaft 3 are fixed by the positioning holes and the blind holes on the cap-shaped handle 2, so that the cap-shaped handle 2 and the screw body 1 can be driven to rotate by the handle 4.

[0037] The connection between the limit plate 5, the cap-shaped handle 2 and the screw body 1 can be referred to Figure 5 , a hook 51 is provided on the upper end surface of the limit plate 5, and a rectangular groove is provided at the bottom end of the cap-shaped handle 2. The hook 51 extends into the rectangular groove and is hooked with the positioning ribs 11 on both sides of the screw body 1 to realize the assembly of the limit plate 5, the screw body 1 and the cap-shaped handle 2. It should be noted that when the bottom end of the rotating shaft 3 is placed in the positioning hole of the limit plate 5, the rotating shaft 3 is submerged in the positioning hole, that is, the bottom end of the rotating shaft 3 does not extend out of the positioning hole. The limit plate 5 is made of plastic material as a whole, and the limit plate 5 protects the accessories to be locked, preventing the bottom end of the rotating shaft 3 from acting on the accessories to be locked and damaging the accessories to be locked. The distance between the upper end surface of the limit plate 5 and the top wall of the receiving groove 21 of the cap-shaped handle 2 is slightly larger than the thickness of the handle 4, thereby improving the smoothness of the handle 4 in rotating and opening.

[0038] In order to prevent the handle 4 from opening automatically when in the closed state, the embodiment of the present invention particularly provides a convex rib 41 on the inner end surface of the handle 4 when it is retracted, and the inner end surface of the cap-shaped handle 2 used to form the accommodating groove 21 is provided with a convex rib groove that cooperates with the convex rib 41. When the handle 4 is rotated to the retracted state, the convex rib 41 just falls into the convex rib groove, realizing the retraction and locking of the handle 4, and preventing the handle 4 from opening automatically. The convex rib 41 has a certain elastic deformation. When the external force drives the handle 4 to rotate and open, the convex rib 41 bends and deforms toward one side of the inner end surface of the handle 4, so that the convex rib 41 can move out of the convex rib groove, realizing the unlocking and opening of the handle 4.

[0039] In addition, the hand screw with adjustable force arm provided in another embodiment of the present invention further includes a sleeve, which is used to be sleeved on the outer periphery of the cap-shaped handle 2 and the handle 4 when the handle 4 is retracted, so as to prevent the handle 4 from automatically opening. When the force arm of the hand screw needs to be increased by means of the handle 4, the sleeve can be removed and the handle 4 can be opened. The sleeve can be made of a plastic film, and the wall thickness can be ignored, so the overall size of the hand screw will not be increased.

[0040] The hand screw with adjustable force arm provided by the present invention can increase the force arm of the hand screw by opening and closing the handle 4, so as to facilitate the customer to disassemble it by hand without tools; at the same time, it does not increase the product size and does not occupy more space, while ensuring the normal use of automated installation tools and ensuring that the packaging material is not modified, thereby significantly enhancing the competitiveness of the product, improving existing product problems, and improving user experience.

[0041] The present invention also provides a PC case, comprising a case body, a case side cover and a hand screw with an adjustable lever arm as described in the above embodiment, wherein the radial dimension of the hand screw does not exceed the width of the assembly flange of the case side cover that is buckled on the case body, and the lever arm of the handle screw can be increased by opening a handle 4, thereby facilitating manual disassembly without tools.

[0042] It should be noted that, in this specification, relational terms such as first and second are merely used to distinguish one entity from other entities, but do not necessarily require or imply any actual relationship or order between these entities.

[0043] The above is a detailed introduction to the PC case and the hand screws with adjustable lever arms provided by the present invention. This article uses specific examples to illustrate the principles and implementation methods of the present invention. The description of the above embodiments is only used to help understand the method and core ideas of the present invention. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present invention, the present invention can also be improved and modified in a number of ways, and these improvements and modifications also fall within the scope of protection of the claims of the present invention.

Claims

1. A hand screw with an adjustable lever arm, characterized in that: The invention is suitable for assembling the side cover of a PC case, wherein the hand screw comprises a screw body and a cap-shaped handle which is fixedly mounted on the outer periphery of the head of the screw body; a handle which can be rotated to open and close relative to the cap-shaped handle is provided on the periphery of the cap-shaped handle; the handle is rotated to open and close in a plane perpendicular to the axial direction of the screw body, and the handle at least comprises a handle whose rotation and opening direction is opposite to the thread direction of the screw body, and when the hand screw with an adjustable force arm needs to be disassembled, the force arm of the hand screw can be increased by rotating and opening the handle; the handle is in the shape of a magatama, and the cap-shaped handle is provided with a receiving groove which matches the handle, the shape of the receiving groove matches the shape of the handle, and the cross-section of the receiving groove is also in the shape of a magatama, and further comprises a rotating shaft which is parallel to the screw body and fixedly arranged in the receiving groove, the handle is rotatably connected to the cap-shaped handle through the rotating shaft, and when the handle is rotated to retract into the receiving groove, the handle and the cap-shaped handle cooperate to form a circular The handle is of a cylindrical structure, and the outer end surface of the handle is flush with the outer contour of the cap-shaped handle or is located within the outer contour of the cap-shaped handle; the handle is provided with a convex rib on the inner end surface for fitting the receiving groove, and the inner end surface of the cap-shaped handle for forming the receiving groove is provided with a convex rib groove cooperating with the convex rib, and when the handle is rotated to retract the receiving groove, the convex rib falls into the convex rib groove; the convex rib has a certain elastic deformation, and when an external force drives the handle to rotate and open, the convex rib bends and deforms toward one side of the inner end surface of the handle, so that the convex rib can be moved out of the convex rib groove to achieve unlocking and opening of the handle; the hand screw with adjustable force arm also includes a sleeve sleeved on the outer periphery of the cap-shaped handle and the handle; the sleeve is used to be sleeved on the outer periphery of the cap-shaped handle and the handle when the handle is retracted, and when it is necessary to increase the force arm of the hand screw with the help of the handle, the sleeve is removed to open the handle; The assembly method of the hand screw comprises the following steps: The cap-shaped handle is embedded in the screw body and bonded together by glue; The rotating shaft is press-fitted into the blind hole of the cap-shaped handle by hot melting and fixed after cooling; Rotate and connect the center of the handle head to the shaft; The bottom of the screw body passes through the through hole of the limiting plate, the limiting plate abuts against the lower end surface of the cap-shaped handle and is fixed to the cap-shaped handle, and the two ends of the rotating shaft are fixed by the positioning hole and the blind hole on the cap-shaped handle.

2. The hand screw with adjustable lever arm according to claim 1, characterized in that: The cap-shaped handle is injection-molded and bonded to the screw body as a whole.

3. The hand screw with adjustable force arm according to any one of claims 1 or 2, characterized in that: The outer periphery of the screw body is provided with positioning ribs protruding along the radial direction thereof.

4. The hand screw with adjustable force arm according to claim 3, characterized in that: The positioning ribs are symmetrically arranged in two groups, and also include a limiting plate for the screw body to pass through. The limiting plate is fitted on the bottom of the cap-shaped handle, and the upper end surface of the limiting plate is provided with a hook connected with the positioning rib.

5. The hand screw with adjustable force arm according to claim 4, characterized in that: The limiting plate is provided with a positioning hole which is matched with the rotating shaft for positioning. The top end of the rotating shaft is connected to the cap-shaped handle by hot melting, and the bottom end of the rotating shaft is immersed in the positioning hole.

6. A PC case, characterized in that: The invention comprises a chassis body, a chassis side cover and a hand screw of an adjustable force arm as claimed in any one of claims 1 to 5 for locking the chassis body and the chassis side cover.

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