A levered gripping / shearing tool handle
The ergonomically designed finger and palm handle structure solves the problems of thumb joint damage and operational instability caused by existing handles, achieving greater grip stability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- 相南设计(丘北)工作室(个人独资)
- Filing Date
- 2025-07-02
- Publication Date
- 2026-06-09
AI Technical Summary
The existing handle design has structural defects, which lead to problems such as thumb joint damage, unstable operation, and insufficient locking.
Adopting an ergonomic design, it features separate handles for the four fingers and thumb, providing a multi-dimensional, real-time locking mechanism to avoid reliance on a return spring and increase grip stability and safety.
It reduces hand injuries, lowers operator fatigue, improves tool grip stability and operational efficiency, and prevents tools from being accidentally dropped.
Smart Images
Figure CN224334403U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of manual tool handle technology, specifically a handle for lever-type clamping / cutting tools such as pliers and scissors for one-handed operation. Through ergonomic design, it optimizes the grip experience and operational safety, and solves the structural defects of existing handles. Background Technology
[0002] The common structure of the handle of a manual lever-type clamping / cutting tool (hereinafter referred to as "tool") is as follows:
[0003] Ring-shaped handle (common in ordinary scissors, such as the children's scissors with a safety locking function disclosed in Chinese patent CN205660762U, which adopts a ring-shaped handle structure).
[0004] Straight handle (often used in pliers or heavy-duty scissors, such as the multi-functional pliers with a straight handle structure disclosed in Chinese patent CN222958561U).
[0005] Hybrid handles (often used in special or heavy-duty scissors, such as the scissors with a hybrid handle structure disclosed in Chinese patent CN222972209U).
[0006] The actions of a user operating a tool typically consist of three parts: opening, closing, and locking / unlocking.
[0007] The existing controller has the following shortcomings.
[0008] Structural defects:
[0009] The ring handle requires the fingers to be inserted into the handle ring, which facilitates precise control of the tool and the action of opening the tool. However, the ring structure often limits the contact area between the palm and the handle, which is not conducive to the use of the whole palm to exert force. The closing action relies on the strength of the thumb to resist the strength of the other fingers, which can easily lead to thumb joint injury (such as thumb arthritis, stenosing tenosynovitis or skin abrasion).
[0010] The straight handle structure facilitates the use of the entire palm, but the single-directional force application makes precise control and opening movements difficult. There are three ways to open a straight-handled tool: 1. Install a return spring to use its elasticity to open the tool; 2. Move the ring or little finger between the fingers and the handle to open the tool; 3. Adjust the handle's counterweight to allow the tool to open naturally in horizontal or downward positions. Tools with return springs increase resistance to the closing action, increasing fatigue during prolonged use; while using the ring or little finger requires frequent adjustments to the grip, reducing efficiency, increasing difficulty, and weakening the tool's control stability; adjusting the handle's counterweight does not meet the requirements for opening the tool when it is tilted upwards.
[0011] Hybrid handles typically use a ring handle as the movable handle and a straight handle as the fixed handle. While this makes it easier for the palm to support the force and avoids the problem of the ring handle damaging the thumb, it still relies on the return spring to complete the opening action, and fatigue is still likely to occur after long-term use.
[0012] Insufficient locking:
[0013] The most common locking structure for tools is a "closed lock," which is a locking mechanism added to the tool for locking / unlocking after the tool is closed. It cannot lock the tool in a timely manner during operation, and the overall structure of the handle is not conducive to a stable grip (locking) of the tool when it is not closed and not engaged with an object. Summary of the Invention
[0014] This utility model provides a handle for a lever-type clamping / cutting tool (hereinafter referred to as "this utility model") to solve the problems mentioned in the background art.
[0015] Ergonomic design: The "finger handle" is designed for the operation of four fingers (index, middle, ring, and little fingers) to meet the needs of opening and closing the handle; the "palm handle" is designed for the operation of the thumb and palm to meet the needs of stable gripping of the tool and locking / unlocking the tool.
[0016] Handle (movable handle, suitable for four-finger operation): Consists of a handle force-applying rod, finger wings, and a handle closing pad. The handle force-applying rod provides a force-applying surface for the four-finger closing action. The finger wings and handle closing pad are fixedly connected to the handle force-applying rod. The finger wings provide a force-applying surface for the middle or index finger to spread out (different from the ring-shaped restriction of the ring handle, it is an inverted U-shape with an opening). It is located on the outside of the handle force-applying rod for easy gripping by the index and middle fingers. The index and middle fingers can precisely control the tool by clamping the finger wings. The handle closing pad is used to limit the maximum degree of tool closure and buffer the closing impact. It is located on the inside of the force-applying rod to prevent the handle from accidentally pinching the user when the tool is closed.
[0017] Handle (fixed handle, adaptable to thumb, index finger, and palm operation): Composed of a handle force-applying rod, palm wings, handle closure pad, function button, anti-fall rope (optional), positioning teeth, and elastic components. The handle force-applying rod provides a closing force surface for both the thenar eminence at the base of the thumb and the hypothenar eminence above the wrist at the base of the little finger. The palm wings and handle closure pad are fixedly connected to the handle force-applying rod. The function button, positioning teeth, and elastic components are installed inside the handle force-applying rod. The palm wings provide a fixing surface for the thumb and index finger, located above the thumb grip position on the outer side of the handle force-applying rod. The handle closure pad is located on the upper inner side of the force-applying rod, working in conjunction with the finger handle closure pad. The function button plays a crucial role in this structure, protruding from the front of the handle force-applying rod and located at the connection point between the handle force-applying rod and the palm wings. Within the free bending radius, it provides a stable force point for the thumb, with the natural bending direction perpendicular to the tool's opening and closing action surface. It is the core control component for locking / unlocking and stable gripping of the tool; the anti-fall rope (optional) prevents the tool from falling accidentally and is a safety supplement to the locking mechanism. It can be fixed to the function button, and the length of the anti-fall rope is determined according to the user's situation and working conditions; the positioning teeth are driven by the function button and are used to lock / unlock the tool's opening and closing angle at the appropriate time. They are located in the cavity at the upper end of the palm handle force bar; the elastic component is used to lock the position of the positioning teeth and prevent the positioning teeth from shifting due to vibration to unlock the tool.
[0018] Timely locking design: The locking action includes: locking the tool in the palm (stable grip), locking the opening and closing angle of the tool (locking the tool), locking the tool within a controllable range (preventing it from falling), and using the overall structural collaborative design to achieve multi-dimensional timely locking of the tool.
[0019] After the user grips the tool, their thumb naturally bends downwards to move the function button, releasing the tool's opening angle lock. The thumb is fixed to the function button, the web of the hand is fixed to the palm wing, and the palm is fixed to the handle's force-applying lever, forming a triangular support structure. This allows the handle to be locked within the palm without relying on the strength of the four fingers or using a return spring. The four fingers, while stably gripping the handle, perform the opening and closing movements of the tool. At this time, the function button serves as the thumb's force-applying point perpendicular to the tool's opening and closing surface. When the tool clamps an object or closes, the four fingers are fixed to the handle, and the palm is fixed to the handle, forming a triangular support structure with the clamped object or closing pad to lock the tool within the palm. At this time, the function button is not needed as a stable grip force-applying point; the thumb returns to its free state and moves the function button upwards to lock the tool's opening angle as needed. When the function button serves as the thumb's force-applying point, the thumb bends downwards to apply force and protect the function button, ensuring that the tool will not be accidentally locked during operation. Proper use of a fall arrestor rope, and securing the tool to the wrist, shoulder, or waist according to the working conditions, can prevent the tool from accidentally falling.
[0020] Beneficial effects: Compared to traditional handles, this invention allows for full-palm force application, reducing unnecessary contact with the hand. It eliminates the need for a return spring to assist in gripping and opening actions, thus reducing hand injury and operator fatigue. The increased force application points perpendicular to the tool's opening and closing surfaces enhance grip stability, and the invention allows for timely locking of the tool's opening angle. When the tool's opening angle is not locked and the object is not stably gripped, tools with traditional handles exhibit poor grip stability; however, this invention maintains a stable grip even when four fingers are removed from the tool. Attached Figure Description
[0021] Figure 1 This is a schematic diagram of the overall structure of this utility model;
[0022] Figure 2 A schematic diagram of the main structure of the finger handle and palm handle;
[0023] Figure 3 This is a schematic diagram showing the structural features and closed state of this utility model;
[0024] Figure 4 This is a schematic diagram of the pliers or scissors used with this utility model;
[0025] Figure 5 A schematic diagram of how to hold this utility model (taking scissors as an example);
[0026] Figure 6 Schematic diagram of the explosive structure of the handle Figure 1 ;
[0027] Figure 7 Schematic diagram of the explosive structure of the handle Figure 2 ;
[0028] Figure 8 Schematic diagram of the explosive structure of the handle Figure 3 ;
[0029] Figure 9 A schematic diagram of the shear / clamp body structure that works in conjunction with the positioning tooth tip structure;
[0030] Figure 10 This is a schematic diagram of the cross-section of the function button.
[0031] In the figure, the serial numbers and corresponding feature names are as follows:
[0032] 3-Finger handle, 4-Hand handle, 31-Finger wing, 32-Finger handle force bar, 33-Finger handle closing pad, 41-Hand wing, 42-Hand handle force bar, 43-Hand handle closing pad, 44-Function button, 45-Anti-fall rope, 46-Positioning tooth, 461-Function button mounting hole, 462-Locking limit hole, 463-Unlocking limit hole, 464-Tooth tip, 4641-Precision tooth tip, 47-Elastic component, 48-Positioning tooth cavity, 4 81-Elastic component mounting hole, 483-Function button limiting hole, 49-Front handpiece, 410-Rear handpiece, r1-C-shaped profile opening size, r2-U-shaped profile opening size, r3-Finger wing width, r4-Parabolic profile opening size, h1-Finger wing length, h2-Hand wing length, h3-Effective handle length, h4-Grip space, h6-Function button height, A-Handle hole, B-Positioning groove, C-Precision positioning groove. Detailed Implementation
[0033] The features of the technical solution of the present invention will now be described with reference to the accompanying drawings. It should be noted that, in the description of this application, the directional terms such as "front, back, up, down, left, right, inside, outside", "horizontal, vertical, perpendicular, horizontal", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. Unless otherwise specified, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and should not be construed as limiting the scope of protection of this application.
[0034] See Figure 1 This utility model consists of a finger handle 3 and a palm handle 4.
[0035] See Figure 2 On the left, the main structure of the finger handle is as follows: the finger wing 31 is fixed to the upper outer side of the finger handle force-applying rod 32; the finger handle closing pad 33 is fixed to the inner side of the finger handle force-applying rod.
[0036] See Figure 2 On the right, the main structure of the handle is as follows: the palm wing 41 is fixed to the upper outer side of the palm handle force-applying rod 42, the palm handle closing pad 43 is fixed to the upper inner side of the palm handle force-applying rod, and the function button 44 protrudes from the front of the palm handle force-applying rod at the connection point with the palm wing; a lanyard position is reserved on the function button (see...). Figure 3 (Below), a fall arrestor rope 45 can be installed as needed to adjust the controllability of the tool.
[0037] The finger handle closing pad and the palm handle closing pad are commonly referred to as buffer pads, limiting pads, stop pads, or anti-pinch pads in existing lever-type clamping / cutting tools (corresponding components such as buffer blocks, limiting blocks, etc.). They are functional components that contact the inner sides of the handle after the tool handle is closed, used to limit the maximum degree of handle closure and buffer impact. They themselves do not involve innovation. When the finger handle closing pad and the palm handle closing pad are in contact, this utility model is in a closed state.
[0038] See Figure 3 The lower part of the palm wing and the palm handle force bar are connected in a parabolic profile to fit the shape of the thumb and forefinger, providing a fixing surface for the thumb and forefinger. The opening size r4 of the parabolic profile is generally 20~40mm. The effective handle length h3 is the shortest distance between the vertex of the parabolic profile and the lower end of the palm handle force bar, providing a force application surface for the palm, and is generally 75~95mm. The palm wing length h2 is the length from the vertex of the parabolic profile to the lower end of the palm wing, which is shorter than the effective handle length h3, and is generally 5~30mm. The height h6 of the function button protruding from the front of the palm handle force bar is 0.3~0.7 times the width of the thumb pad, and is generally 8~15mm.
[0039] The upper part of the finger wing and the force-applying rod of the finger handle are connected in a C-shaped contour, providing a force-applying surface for the index finger. The opening size r1 of the C-shaped contour is larger than the diameter of the distal phalanx of the index finger, and is generally taken as 18~25mm. The lower part of the finger wing and the force-applying rod of the finger handle are connected in an inverted U-shaped contour, providing a force-applying surface for the finger to spread out. The opening size r2 of the U-shaped contour is slightly larger than the diameter of the distal phalanx of the middle finger, and is generally taken as 18~25mm. The width r3 of the finger wing is the shortest distance between the C-shaped contour and the U-shaped contour, which affects the experience of the index and middle fingers holding the finger wing, and is generally taken as 5-15mm. The length h1 of the finger wing is the length from the apex of the U-shaped contour to the lower end of the finger wing, which is greater than the diameter of the distal phalanx of the middle finger and shorter than the effective handle length h3, and is generally taken as 20~30mm (the difficulty of spreading the handle decreases as the length of the finger wing increases).
[0040] When this utility model is in the closed state, the gripping space h4 formed by the finger handle force-applying rod and the palm handle force-applying rod should allow the hand to hold the tool stably, and is generally taken as 30~50mm. The specific technical parameters mentioned above should be determined according to the hand size of the target user.
[0041] See Figure 4 This utility model itself does not have a functional use; it needs to be fixed to an existing pair of scissors or pliers to form a complete pair of pliers. Figure 4 (above) or scissors ( Figure 4 (The following) can enable its structural function to be fully realized (in the existing technology, the methods of fixing the handle and the tool body, such as bolt connection, welding, one-piece molding, etc., are common knowledge in the field and will not be elaborated here).
[0042] See Figure 5 When the hand holds this utility model, the fingers are allowed to grip the finger wings for precise control of the tool. Using the base of the middle finger on the palm side as a reference, the side of the extended middle finger tip is the outer side of the finger handle force-applying rod, the side of the thumb base is the outer side of the palm handle force-applying rod, the surface that contacts the thumb is the front of the palm handle force-applying rod, the index finger direction is upward, and correspondingly, the area between the finger handle and the palm handle is the inner side of the finger handle force-applying rod and the inner side of the palm handle force-applying rod, with the little finger direction downward.
[0043] To make the above-mentioned features and advantages of this utility model more apparent and understandable, specific embodiments are provided below in conjunction with the accompanying drawings for detailed description. Obviously, the described embodiments are only a portion of the embodiments, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments in this application should fall within the scope of protection of this application.
[0044] See Figure 6 According to their relative positions, the handle can be divided into a front handle piece 49 and a rear handle piece 410. A positioning tooth cavity 48 is formed at the upper end of the front or rear handle piece to accommodate the positioning tooth 46 and provide vertical movement space for the positioning tooth. A function button mounting hole 461, a locking limit hole 462, and an unlocking limit hole 463 are formed on the positioning tooth, and the upper end of the positioning tooth is a tooth tip 464. The function button passes through the function button limit hole 483 formed in the front handle piece and is installed in the function button mounting hole 461 (preferably, the installation method is bolt connection or snap-fit). An elastic member 47 (the elastic member selected in this embodiment is a prior art automatic reset ball head spring plunger, also known as a positioning plunger, spring pin, etc.) is fixed in the elastic member mounting hole 481. The axes intersect and are perpendicular to the center line connecting the locking limit hole and the unlocking limit hole; when the force of pushing the function button upward to move the positioning tooth upward exceeds the elastic force threshold of the elastic member, the positioning tooth moves upward. When the locking limit hole is aligned with the axis of the elastic member, the elastic member pushes the ball head into the locking limit hole under its own elastic force, fixing the position of the positioning tooth. At this time, the tooth tip moves upward to the preset locking position; when the force of pushing the function button downward to move the positioning tooth downward exceeds the elastic force threshold of the elastic member, the positioning tooth moves downward. When the unlocking limit hole is aligned with the axis of the elastic member, the ball head of the elastic member pushes into the unlocking limit hole, fixing the position of the positioning tooth. At this time, the tooth tip moves downward to the preset unlocking position.
[0045] Preferred, see Figure 7In the prior art, the scissor / pliers body is installed between the positioning teeth and the front plate of the handle. The positioning tooth cavity and the elastic member mounting hole should be located on the rear plate of the handle. A handle hole A should be opened on the handle of the scissor / pliers body for the function button to pass through (this modification is a conventional adjustment in the prior art and does not involve any innovation in the scissor body) so that the function button can be connected to the positioning teeth.
[0046] Optional, see Figure 8 In the prior art, the shear / clamp body is installed between the positioning teeth and the rear plate of the palm handle, and the positioning tooth cavity and the elastic member mounting hole should be located on the front plate of the palm handle.
[0047] Optionally, when this invention is used for scissors or pliers that only require a locked, closed state, it can be referred to... Figure 9 As shown on the left, a positioning groove B is formed in the existing scissors or pliers. This positioning groove should be able to engage with the tooth tips when they reach the locking position to complete tool locking. When this invention is used for pliers requiring high locking precision, it can be referenced. Figure 9 As shown on the right, a precision positioning groove C, composed of multiple positioning grooves, is formed in the existing clamp body. Simultaneously, the tooth tip is modified to a precision tooth tip 4641 that can mesh with the shape of the precision positioning groove. (Those skilled in the art will know that the specific shapes of the positioning groove and tooth tip (such as rectangular, trapezoidal, or serrated) are conventional choices based on functional requirements. The innovation of this patent lies in the position of the locking mechanism and the mechanism of timely locking achieved by driving the positioning teeth through a function button, rather than the specific shape itself.) If the tool does not require locking, the positioning teeth, the positioning tooth cavity that allows the positioning teeth to move up and down, the elastic member, and the mounting hole of the elastic member can be eliminated, leaving only the function button.
[0048] Optionally, the elastic member can be replaced by an elastic element such as a spring sheet or a spring, and the locking limit hole, the unlocking limit hole, and the elastic member mounting hole can be modified accordingly.
[0049] Optional, see Figure 10 The function button is to provide a thumb pressure point in the up and down direction. The key is the position and height h6 of the function button, rather than its specific shape.
[0050] See Figure 4 , Figure 5When the existing scissors / pliers are combined with this utility model, four fingers control the handle and the palm controls the handle. The thumb naturally bends downward to push the function button to release the tool's opening and closing angle lock. At this time, the thumb is fixed to the function button, the web of the hand is fixed to the palm wing, and the palm is fixed to the handle's force bar to form a triangular support structure, locking the handle inside the palm. The function button serves as the thumb's force point perpendicular to the tool's opening and closing surface. The four fingers, while stably holding the handle, can greatly improve the tool's user experience by opening and closing the tool, and avoid hand injuries caused by unnatural finger bending. When the tool clamps / closes an item, the four fingers act on the handle, the palm acts on the handle's force bar, and the combined force of the four fingers and the palm, together with the clamped item / closing pad, forms a triangular support structure to lock the tool inside the palm. At this time, the function button is not needed as a stable gripping force point; the thumb returns to its free state and pushes the function button upward to lock the tool's opening and closing angle as needed. When the function button is used as a thumb application point, the thumb bends downward to apply force and protect the function button, thereby fixing the tooth tip in the unlocked position and ensuring that the tool will not be accidentally locked during operation. Except for the limited inner arc area of the finger and palm wings, this invention does not contact the rest of the skin on the back of the hand, reducing skin damage from prolonged use.
[0051] The fall arrestor 45 (the fall arrestor selected in this embodiment is a common wrist rope, also known as a lanyard, hand rope, wristband, etc.) can be tied to the function button at one end and fixed to the wrist at the other end to restrict the tool to the range of hand movement and prevent the tool from falling accidentally.
Claims
1. A handle for a lever-type clamping / cutting tool, comprising a finger handle (3) and a palm handle (4), characterized in that: The structure of the finger handle (3): the finger wing (31) is fixed to the upper outer side of the finger handle force bar (32), and the finger handle closing pad (33) is fixed to the inner side of the finger handle force bar (32); the upper part of the finger wing (31) has a C-shaped profile and the lower part has an inverted U-shaped profile; Handle (4) structure: palm wing (41) is fixed to the upper outer side of the palm handle force bar (42); palm handle closing pad (43) is fixed to the upper inner side of the palm handle force bar (42); function button (44) is protruding and set at the connection between the palm handle force bar (42) and the palm wing (41); the lower part of the palm wing (41) has a parabolic profile.
2. The handle according to claim 1, characterized in that, The opening size (r1) of the C-shaped contour of the finger wing (31) is 18~25mm, the opening size (r2) of the U-shaped contour is 18~25mm, the width (r3) of the finger wing between the C-shaped contour and the U-shaped contour is 5-15mm, and the length (h1) of the finger wing from the vertex of the U-shaped contour to the lower end of the finger wing (31) is 20~30mm.
3. The handle according to claim 1, characterized in that, The parabolic profile opening size (r4) of the palm wing (41) is 20~40mm, and the palm wing length (h2) from the vertex of the parabolic profile to the lower end of the palm wing (41) is 5~30mm; the height (h6) of the function button (44) protruding from the front of the palm handle force bar (42) is 8~15mm; the effective handle length (h3) between the vertex of the parabolic profile and the lower end of the palm handle force bar (42) is 75~95mm.
4. The handle according to claim 1, characterized in that, When the handle is in the closed state, the gripping space (h4) formed by the finger handle force bar (32) and the palm handle force bar (42) is 30~50mm.