Compact handheld edge trimmer with easy-to-hold and replaceable head characteristics

Abstract

The utility model discloses a compact handheld edge trimmer with the characteristics of convenient holding and replaceable tool bit, including the edge trimmer main part that constitutes by holding mechanism and tool bit subassembly, holding mechanism is including the pneumatic assembly of connecting in pneumatic motor tail portion, and is equipped with the rotary switch in the outside of pneumatic assembly, and the outside of pneumatic motor is covered and is formed holding portion through the cover, and tool bit subassembly includes the bearing of connecting with pneumatic motor head, and the one end of bearing is connected with blade through connecting rod, and the bottom position of blade is equipped with tool holder, and one side of bearing is equipped with connecting seat, and connecting seat is connected with tool holder through connecting hole, and the bottom of connecting rod passes through blade, and is fixed through fastener, and connecting seat and connecting rod realize the detachable connection with tool holder and blade through connecting hole and fastener respectively. The utility model has solved the problem of inconvenient holding and heavy feeling of the handheld edge trimmer in the prior art.

Description

Technical Field

[0001] This utility model relates to the field of handheld portable electric and pneumatic tools, and in particular to a compact handheld trimmer with features of easy grip and replaceable blades. Background Technology

[0002] An edge trimming machine is used to trim the edges of foam cotton products. It can remove burrs from the edges of these materials or trim them into rounded or right-angled corners. It is small in size. Due to its relatively low power, it is generally used mainly for edge trimming.

[0003] Handheld trimming devices are now available on the market. Structurally, they consist of an outer casing that encloses the internal drive and circuitry, with a cutting head at the top and a switch located within the casing. When in use, gripping the switch activates the device, and releasing it stops it.

[0004] However, most existing handheld trimming machines use a grip switch, which requires maintaining a tight grip while working. This is not only inconvenient to hold, but also results in a large size, heavy feel, and is not conducive to precise trimming over a long period of time. In addition, the cutter heads of existing handheld trimming machines cannot be replaced, requiring switching between multiple trimming machines for different materials, which affects the overall processing efficiency.

[0005] In view of this, this technical solution proposes a compact handheld trimmer with easy-to-hold and replaceable blades. It not only further eliminates unnecessary structures and redundant space, but also adopts a replaceable blade assembly structure and a tail-mounted pneumatic rotary switch, making the entire trimmer smaller and easier to hold. Utility Model Content

[0006] The present invention aims to at least partially solve one of the technical problems in the related technologies. Therefore, the main objective of this invention is to provide a compact handheld trimmer with easy-to-grip and replaceable blades, thereby addressing the problems of existing handheld trimmers being inconvenient to hold or causing elbow pain due to their weight.

[0007] To achieve the above objectives, this utility model provides a compact handheld trimming machine with features of easy grip and replaceable blades, comprising a trimming machine body consisting of a gripping mechanism and a blade assembly.

[0008] The gripping mechanism includes a pneumatic assembly connected to the tail of a pneumatic motor, and a rotary switch is sleeved on the outside of the pneumatic assembly. The gripping part is formed by a housing covering the outside of the pneumatic motor.

[0009] The cutter head assembly includes a bearing connected to the pneumatic motor head, one end of the bearing being connected to the blade via a connecting rod, and a cutter holder being provided at the bottom of the blade.

[0010] A connecting seat is provided on one side of the bearing. The connecting seat is connected to the tool holder through a connecting hole. The bottom of the connecting rod passes through the blade and is fixed by a fastener. The connecting seat and the connecting rod are detachably connected to the tool holder and the blade through the connecting hole and the fastener, respectively.

[0011] As a further embodiment of this utility model, the head of the pneumatic motor is provided with a helical gear that runs in the Y-axis direction, and the top plane of the bearing forms a transmission gear that meshes with the helical gear.

[0012] As a further embodiment of this utility model, the holding mechanism and the blade assembly are in an "L"-shaped vertical structure, or the holding part and the blade assembly are in an inclined structure of about 125 degrees.

[0013] As a further embodiment of this utility model, the bearing and the area enclosing the transmission gear and the helical gear are framed by an outer cover, and one side of the outer cover is detachably connected to the connecting seat.

[0014] As a further embodiment of this utility model, both the housing and the inner cavity of the rotary switch are cylindrical structures, and the outer surface of the cylindrical structure is provided with protruding ridges.

[0015] As a further improvement of this invention, the fastener is a bolt structure.

[0016] The beneficial effects of this utility model are as follows:

[0017] This technical solution improves the ease of operation and functionality of the handheld trimmer by optimizing the connection structure between the gripping mechanism and the cutter head assembly. The gripping mechanism employs a rotary switch design, avoiding the burden of continuous pressing required by traditional handheld switches, making gripping more effortless and control more precise. More importantly, existing handheld engraving and grinding machines are heavy and bulky, generally weighing between 550g and 1000g (approximately 35mm in diameter and over 19cm in length). This solution significantly reduces the size and weight, keeping it below 240g (diameter below 14mm and length below 14cm). Furthermore, the cutter head assembly achieves a quick and reliable detachable connection between the cutter head and the cutter holder through the connection hole of the connecting seat and the fastener-fixed connection of the connecting rod to the blade. This makes changing the cutter head simple and quick, adapting to different processing needs without the need for special tools. By combining a compact L-shaped or 125-degree inclined structure, efficient and smooth gear transmission, safe protection from the outer casing, and an anti-slip grip design for the casing, this solution ultimately achieves a more efficient handheld trimming machine that is easier to hold, safer, and allows for flexible blade replacement. Attached Figure Description

[0018] To more clearly illustrate the technical solutions of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the technical solutions of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the trimming machine in this utility model.

[0020] Figure 2 This is a disassembled structural diagram of the holding mechanism in this utility model.

[0021] Figure 3 This is a schematic diagram of one side planar structure of the holding mechanism in this utility model.

[0022] Figure 4 This is an assembly diagram of the pneumatic motor and pneumatic connector in this utility model.

[0023] Figure 5 A schematic diagram showing another type of cutter head that can be replaced with the main body of the trimming machine in this utility model.

[0024] Figure 6 This is a schematic diagram showing the components that were replaced after disassembling the blade assembly in this utility model.

[0025] [Explanation of Markings on Main Components / Assemblies]

[0026] 1 The main body of the trimming machine 110 Transmission gears 10 Holding mechanism 111 bearings 100 pneumatic motor 112 Connecting rod 101 helical gears 1120 fastener 102 shell 113 Connector 103 Intake assembly 1130 Connection hole 104 Rotary switch 114 Knife holder 11 Cutter head assembly 115 blade 12 outer casing Detailed Implementation

[0027] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0028] The term "one embodiment" or "implementation" as used herein refers to a specific feature, structure, or characteristic that may be included in at least one implementation of this utility model. In the description of this utility model, it should be understood that the terms "upper," "lower," "left," "right," "top," "bottom," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing this utility model and simplifying the description, and 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 therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" and "second" may explicitly or implicitly include one or more of that feature. Moreover, the terms "first," "second," etc., are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this utility model described herein can be implemented in orders other than those illustrated or described herein.

[0029] Please see the appendix Figure 1-6 ,

[0030] The handheld trimming machine of this technical solution mainly consists of two parts: a holding mechanism (10) and a blade assembly (11). The holding mechanism (10) includes a pneumatic connector connected to the tail of the pneumatic motor (100). A rotary switch 104 is sleeved on the outside of the air intake assembly 103. The pneumatic motor (100) is protected by a housing (102), which forms the holding part. The blade assembly (11) includes a bearing (111) connected to the head of the pneumatic motor (100). One end of the bearing (111) is connected to the blade (115) through a connecting rod (112). A blade holder (114) is provided at the bottom of the blade (115). A connecting seat (113) is also provided on one side of the bearing (111). The connecting seat (113) is connected to the tool holder (114) through the connecting hole (1130). At the same time, the bottom of the connecting rod (112) passes through the blade (115) and is fixed with fasteners (1120) (such as bolts). In this way, the connecting seat (113) is detachably connected to the tool holder (114) through the connecting hole (1130), and the connecting rod (112) is detachably connected to the blade (115) through the fasteners (1120), so that the entire tool head can be easily disassembled and replaced.

[0031] Specifically, from the perspective of structural assembly, when the air intake assembly 103 is connected to the air source, the start and stop are operated by rotating the rotary switch (104), thereby starting the pneumatic motor (100). The pneumatic motor (100) drives the bearing (111) to rotate, and the bearing (111) then drives the blade (115) to rotate at high speed in the blade holder (114) through the connecting rod (112) to perform trimming operations.

[0032] Understandably, since the cutter holder (114) and the blade (115) are detachably connected, when replacing the cutter head, simply loosen the fastener (1120) and the connecting hole (1130) to remove the old cutter holder (114) and the blade (115), replace them with the new cutter holder (114) and the blade (115), and then re-fix them. The holding mechanism (10) uses a rotary switch (104) instead of a traditional grip switch, which avoids the burden of continuous gripping during operation, making the grip easier and more stable, which is conducive to precise trimming. Moreover, this structure avoids the increase in size caused by using a clamping switch. At the same time, the cutter head assembly (11) can be quickly replaced to adapt to different materials or processing needs without replacing the entire machine, which greatly improves processing efficiency and flexibility. In addition, the overall structure is compact, reducing redundant space, making the trimming machine small in size and easy to operate by hand.

[0033] Reference Appendix Figure 2 , 3In a preferred embodiment of the present invention, a helical gear (101) running along the Y-axis is provided at the head of the pneumatic motor (100), and a transmission gear (110) (vertically meshing) is formed on the top plane of the bearing (111) connected thereto for meshing with the helical gear (101).

[0034] Specifically, when power is transmitted from the pneumatic motor (100) to the cutter head assembly (11), it is achieved through the direct meshing of two gear components, the helical gear (101) and the transmission gear (110). Compared with other transmission forms, it has the beneficial effects of high transmission efficiency, direct and reliable power transmission, smooth operation and low noise, so that the trimmer not only transmits power more fully when working, but also has a quieter and more comfortable operating experience.

[0035] Reference Appendix Figure 3 In a preferred embodiment of this utility model, the gripping mechanism (10) and the blade assembly (11) together form an "L"-shaped vertical structure or a 125-degree inclined structure. The operator can naturally and comfortably grip the gripping mechanism (10), while the blade assembly (11) perpendicular to it faces the working surface, which is more ergonomic during trimming operations, making it easier to apply uniform downward pressure and stably control the machine.

[0036] Its beneficial effects are that the "L"-shaped or 125-degree tilted layout makes the trimming machine more agile and labor-saving when dealing with the edges of objects, especially corners or vertical surfaces. The blade head is easier to align and fit the edges of different shapes, significantly improving the control precision of the operation and the adaptability to various trimming scenarios.

[0037] Reference Appendix Figure 2 In a preferred embodiment of this utility model, an outer cover (12) is provided outside the transmission area where the bearing (111) and the transmission gear (110) mesh with the helical gear (101), which encloses the core transmission component. One side of the outer cover (12) is detachably connected to the connecting seat (113) on the cutter head assembly (11), so that the outer cover (12) can completely enclose the high-speed rotating transmission component.

[0038] The beneficial effects are mainly twofold. On the one hand, it can effectively prevent external dust and impurities from entering the precision transmission parts and affecting the operation. More importantly, it can prevent operators from accidentally touching moving parts and causing injury, thus improving the safety of equipment use. On the other hand, since the outer cover (12) itself is detachably connected to the connecting seat (113), when it is necessary to replace the cutter head or perform internal maintenance, the outer cover (12) can be easily removed, making the inspection and replacement operation simple and quick.

[0039] Reference Appendix Figure 2 , 4 In a preferred embodiment of this invention: The housing (102) for enclosing the pneumatic motor (100) and the rotary switch (105) for enclosing the air intake assembly (103) both have cylindrical internal structures, with raised ridges on the outside of these cylindrical structures. This housing design allows for close contact with internal components, facilitating processing. Its cylindrical shape conforms to the grip contour of the human hand, providing a comfortable and stable grip for extended periods during handheld operation. The external raised ridges significantly increase the friction between the hand and the housing surface, effectively preventing slippage. This design is significantly smaller and easier to hold than existing large-scale engraving machines, with a total weight not exceeding 240g (compared to the weight of existing handheld engraving machines, which are generally between 550g and 1000g).

[0040] Reference Appendix Figure 6 In a preferred embodiment of this utility model, the fastener (1120) used to fix the bottom of the connecting rod (112) to the blade (115) is a common bolt structure. The connection or disassembly of the connecting rod (112) and the blade (115) can be quickly completed using ordinary tools, making the replacement and maintenance of the blade head very convenient. At the same time, the bolt connection can provide reliable fastening force to ensure the stability of the blade (115) during operation.

[0041] It is understandable that, in addition to using bolts or screws as fasteners (1120), this solution can also use other detachable connection structures, such as clips, magnetic attachments, etc.

[0042] The following points need to be explained:

[0043] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0044] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure can be combined with each other.

[0045] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A compact handheld trimming machine with easy-to-grip and replaceable blades, characterized in that, include The main body of the trimming machine consists of a holding mechanism and a cutter head assembly. The gripping mechanism includes a pneumatic assembly connected to the tail of a pneumatic motor, and a rotary switch is sleeved on the outside of the pneumatic assembly. The gripping part is formed by a housing covering the outside of the pneumatic motor. The cutter head assembly includes a bearing connected to the pneumatic motor head, one end of the bearing being connected to the blade via a connecting rod, and a cutter holder being provided at the bottom of the blade. The bearing has a connecting seat on one side, which is connected to the tool holder through a connecting hole. The bottom of the connecting rod passes through the blade and is fixed by fasteners. The connecting seat and the connecting rod are detachably connected to the tool holder and the blade through the connecting hole and the fasteners, respectively.

2. The compact handheld trimmer with easy-to-grip and replaceable blade features according to claim 1, characterized in that, The head of the pneumatic motor is provided with a helical gear that runs in the Y-axis direction, and the top plane of the bearing forms a transmission gear that meshes with the helical gear.

3. The compact handheld trimmer with easy-to-grip and replaceable blade features according to claim 1, characterized in that, The gripping part and the blade assembly have an overall "L"-shaped vertical structure.

4. The compact handheld trimmer with easy-to-grip and replaceable blade features according to claim 2, characterized in that, The bearing and the area enclosed by the transmission gear and the helical gear are framed by an outer cover, and one side of the outer cover is detachably connected to the connecting seat.

5. The compact handheld trimmer with easy-to-grip and replaceable blade features according to claim 1, characterized in that, Both the housing and the inner cavity of the rotary switch are cylindrical, and the outer surface of the cylindrical structure is provided with protruding ridges.

6. The compact handheld trimmer with easy-to-grip and replaceable blade features according to claim 1, characterized in that, The fastener is a bolt structure.

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