Pruning shears

Abstract

The pruning shears comprise a machine shell, a fixing base, a blade assembly, a fixing assembly and a driving mechanism, and an installation space is formed in the machine shell; the fixed seat is fixed to the machine shell. The blade assembly comprises a first blade and a second blade which are installed on the fixing base and exposed out of the machine shell. The fixing assembly comprises a fixing bolt and a locking nut which are used for fixing the first blade and the second blade to the fixing base, and a locking piece fixed to the fixing base, the locking piece makes contact with the locking nut and stops the locking nut from rotating, and the fixing assembly further comprises a fixing piece which is fixed to the fixing base and stops the locking piece from rotating; the driving mechanism is fixed in the mounting space, and is connected with and drives the first blade and / or the second blade to rotate. According to the pruning shears, the fixing piece is arranged to prevent the locking piece from rotating along with the locking nut, so that the locking nut is fixed to prevent the locking nut from rotating, and the locking nut is loosened from the fixing bolt.

Description

Technical Field

[0001] The utility model belongs to the technical field of electric tools, in particular to a pruning shear. Background Art

[0002] Scissors (including electric scissors) are commonly used tools in people's daily work and daily life. Usually, the two blades are connected by a central axis. After long-term use, the connection between the central axis and the fastener at one end may become loose, causing the blades to loosen, affecting the use effect, or even causing the fastener to fall off and the blade to detach, causing damage to the tool and leading to safety accidents.

[0003] The information disclosed in this background technology section is only intended to increase the understanding of the overall background of the present invention, and should not be regarded as an admission or any form of suggestion that the information constitutes the prior art already known to those skilled in the art. Utility Model Content

[0004] The utility model aims to provide a pruning shear to solve the problem of blade loosening after long-term use.

[0005] In order to achieve the above-mentioned purpose, a specific embodiment of the present invention provides a pruning shear, including a casing, a fixing base, a blade assembly, a fixing assembly and a driving mechanism, wherein an installation space is formed inside the casing; the fixing base is fixed to the casing; the blade assembly includes a first blade and a second blade installed on the fixing base and exposed from the casing; the fixing assembly includes a fixing bolt and a locking nut for fixing the first blade and the second blade to the fixing base, and a locking member fixed on the fixing base, the locking member contacts and blocks the locking nut from rotating, and the fixing assembly also includes a fixing member fixed to the fixing base and preventing the locking member from rotating; the driving mechanism is fixed in the installation space, which connects and drives the first blade and / or the second blade to rotate.

[0006] In one or more embodiments of the present invention, a groove is provided on the fixing seat, the locking member is at least partially embedded in the groove, the portion of the locking member embedded in the groove is attached to the side wall of the groove, and the side wall of the groove constitutes the fixing member.

[0007] In one or more embodiments of the present invention, the fixing member includes a bolt for fixing the locking member to a fixing seat.

[0008] In one or more embodiments of the present invention, the fixing member includes a limiting portion or a limiting groove arranged on the fixing seat, and the limiting portion is distributed on both sides of the locking member rotating in the clockwise and counterclockwise directions, which contacts and prevents the locking member from rotating.

[0009] In one or more embodiments of the present invention, a plurality of tooth grooves are recessed on the outer peripheral wall of the locking nut, and the locking member includes a pawl extending into the tooth groove, and the pawl contacts the side wall of the tooth groove.

[0010] In one or more embodiments of the present invention, at least two pawls are provided on the locking member, and the pawls extend into the tooth grooves respectively.

[0011] In one or more embodiments of the present invention, a plurality of protrusions protrude from the outer peripheral wall of the locking nut, and the locking member protrudes with two pawls extending and clamping one of the protrusions.

[0012] In one or more embodiments of the present invention, a non-circular limiting hole is provided on the fixing seat for the fixing bolt to pass through, and the fixing bolt includes a limiting portion passing through the limiting hole, and a threaded portion connected to the limiting portion and mating with the locking nut thread, and the limiting portion abuts against the inner wall of the limiting hole.

[0013] In one or more embodiments of the present invention, the fixing bolt, locking nut and locking member are exposed from the casing, a recess is formed on the casing, the recess is arranged at the exposed ends of the first blade and the second blade, and the locking member and at least part of the locking nut are arranged in the recess.

[0014] In one or more embodiments of the present invention, a limiting member for limiting the locking member from detaching from the fixing seat is further provided on the fixing seat, and the limiting member has a first state and a second state. In the first state, the locking member is fixed to the fixing seat; in the second state, the locking member is separated from the fixing seat.

[0015] Compared with the prior art, the pruning shears of the present invention prevents the locking member from rotating with the locking nut by providing a fixing member, thereby fixing the locking nut to prevent it from rotating, causing the locking nut to loosen from the fixing bolt. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0017] Figure 1 This is a partial schematic diagram of a pruning shear in one embodiment of the utility model;

[0018] Figure 2AThis is a schematic diagram of a fixing base in one embodiment of the present utility model;

[0019] Figure 2B This is a schematic diagram of a fixing base in another embodiment of the present invention;

[0020] Figure 3 This is a schematic diagram of a fixing bolt in one embodiment of the present utility model;

[0021] Figure 4A This is a schematic diagram of the cooperation between the locking nut and the locking member in one embodiment of the present utility model;

[0022] Figure 4B This is a schematic diagram of the cooperation between the locking nut and the locking member in another embodiment of the present utility model;

[0023] Figure 5 Schematic diagram of pruning shears in one embodiment of the present invention.

[0024] Description of main reference numerals:

[0025] 100-pruning shears, 10-fixing seat, 11-limiting hole, 12-groove, 13-limiting portion, 20-blade assembly, 21-first blade, 22-second blade, 31-fixing bolt, 311-limited portion, 312-threaded portion, 32-locking nut, 321-tooth groove, 322-bump, 33-locking member, 331-pawl, 40-housing, 41-recessed portion. DETAILED DESCRIPTION

[0026] In order to enable those skilled in the art to better understand the technical solutions of the present invention, the following will be combined with the drawings of the embodiments of the present invention to clearly and completely describe the technical solutions of the embodiments of the present invention. Obviously, the embodiments described 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 making creative efforts shall fall within the scope of protection of the present invention.

[0027] like Figure 1-5 As shown, a pruning shear 100 in one embodiment of the present invention includes a fixing base 10, a blade assembly 20, a fixing assembly, a housing 40, and a drive mechanism. The housing 40 has an interior formed with an installation space. The fixing base 10 is fixed to the housing 40 to provide a mounting location for the blade assembly 20. The blade assembly 20 includes a first blade 21 and a second blade 22. The drive mechanism is fixed to the interior mounting space of the housing 40 and is used to connect and drive the first blade 21 and / or the second blade 22 to rotate. The fixing assembly includes a fixing bolt 31 and a locking nut 32 for securing the first blade 21 and the second blade 22 to the fixing base 10, as well as a locking member 33 for preventing the locking nut 32 from rotating.

[0028] During use, the first blade 21 and / or the second blade 22 rotate about the fixing bolt 31. Driven by the blades, the locking nut 32 may also rotate, easily moving away from the fixing bolt 31, causing it to loosen from the fixing bolt 31 and weakening the locking effect. This can create a gap between the first blade 21 and the second blade 22, which can gradually increase over time, causing the tool to not cut properly and even causing the locking nut 32 to separate from the fixing bolt 31, leading to a safety accident.

[0029] To avoid the above situation, this embodiment has a locking member 33 fixed to the fixing base 10. The locking member 33 abuts against and prevents the locking nut 32 from rotating. Furthermore, to prevent the locking nut 32 from driving the locking member 33 to rotate, a fixing member is also provided on the fixing base 10 to prevent the locking member 33 from rotating. Under the action of the fixing member, the locking member 33 is firmly fixed to the fixing base 10 and cannot rotate. Therefore, there will be no relative rotation between the locking nut 32 and the fixing bolt 31, and the position of the locking nut 32 on the fixing bolt 31 will not change. The first blade 21 and the second blade 22 are always locked together by the locking nut 32, and there will be no gap or even separation between the two. This makes the blade maintenance-free and highly safe.

[0030] The fixing base 10 is provided with a restricting member that secures the locking member 33 to the fixing base 10. This restricting member can be a bolt, a bayonet, or a plate that rotates on the fixing base 10 to prevent the locking member 33 from detaching from the fixing base 10. The restricting member has two states: in the first state, the locking member 33 is fixed to the fixing base 10; in the second state, the effect of the restricting member on the locking member 33 disappears, allowing the locking member 33 to detach from the fixing base 10. The locking member 33 is fixed to the fixing base 10 by the restricting member and is then prevented from rotating by the fixing member.

[0031] Specifically, a groove 12 is formed on the fixing base 10. The groove 12 is used to accommodate the locking member 33, and the locking member 33 is at least partially embedded in the groove 12. The outer contour of the groove 12 is the same as the embedded portion of the locking member 33. Therefore, after the locking member 33 is embedded in the groove 12, the groove 12 and the embedded portion of the locking member 33 are completely aligned. The sidewalls of the groove 12 constitute the aforementioned fixing member, which prevents the locking member 33 from rotating.

[0032] In other embodiments, the fixing member may be a bolt that secures the locking member 33 to the fixing base 10. This bolt can form another fixing point between the locking member 33 and the fixing base 10 in addition to the limiting member, thereby preventing the locking member 33 from rotating. For example, when both the limiting member and the fixing member are bolts, the locking member 33 is secured to the fixing base 10 by at least two bolts, and the locking member 33 cannot rotate about any axis.

[0033] The fixing member can also adopt a cylindrical structure that blocks the rotation of the locking member 33 as a limiting portion, for example Figure 2B As shown, a columnar limiting portion 13 protrudes from the surface of the fixing seat 10, and multiple limiting portions 13 are distributed on both sides of the locking member 33 and contact the locking member 33. The locking member 33 is limited between the limiting portions 13, resulting in it being unable to rotate clockwise or counterclockwise.

[0034] When the limiting portion 13 is provided on the fixing seat 10 , a slot (not shown) may be provided at a corresponding position on the locking member 33 . By inserting the limiting portion 13 into the corresponding slot, the locking member 33 is prevented from rotating.

[0035] It is easy to imagine that the limiting portion 13 can also protrude from the locking member 33. In this case, a limiting groove (not shown) for accommodating the limiting portion 13 needs to be provided at a corresponding position on the surface of the fixing base 10. After the limiting portion 13 is inserted into the corresponding locking groove, the locking member 33 is also unable to rotate. In this case, the limiting groove is the fixing member mentioned above.

[0036] It should be understood that the fixing member for preventing the locking member 33 from rotating is not limited to one or any combination of the above-mentioned groove 12, the limiting portion 13 and fixing by multiple bolts.

[0037] In such Figure 4A In the embodiment shown in FIG, the locking nut 32 has a gear-like structure with multiple tooth grooves 321 formed on its outer peripheral wall. The locking member 33 includes protruding pawls 331 that extend into the tooth grooves 321 and contact the sidewalls of the tooth grooves 321. Due to the large number of pawls 331, they can be inserted into any of the tooth grooves 321. Therefore, the locking nut 32 can be rotated to any desired position without being restricted to a specific angle, providing greater flexibility. Since the locking member 33 cannot rotate, the pawls 331 cannot move either. Consequently, the locking nut 32 cannot rotate due to the obstruction of the pawls 331.

[0038] In order to further improve the limiting effect of the locking member 33 on the locking nut 32, a plurality of ratchet claws 331 protrude from the locking member 33, for example Figure 4A In the figure, the locking member 33 has three protruding pawls 331, among which the pawl 331 located in the middle position is located on the straight line where the center of the locking nut 32 and the center of the locking member 33 are located, and the other two pawls 331 are symmetrically distributed on both sides of the middle pawl 331. Therefore, there is a three-point contact between the locking member 33 and the locking nut 32. The more contact positions reduce the force on each pawl 331, and it has higher stability compared with a single pawl 331.

[0039] Of course, the pawls 331 may also be provided in other numbers, which is not limited in this embodiment.

[0040] In another embodiment (such as Figure 4B As shown), when the clamp-shaped structure of the double pawls 331 is selected, multiple protrusions 322 can be protruded from the outer peripheral wall of the locking nut 32, and the two pawls 331 respectively extend to the two sides of one of the protrusions 322 and abut against its two sides. The locking member 33 "clamps" the protrusion 322 through the double pawls 331, thereby fixing the locking nut 32.

[0041] The locking nut 32 can be divided into two parts along its own axial direction, one of which is the bottom part that contacts the surface of the fixing seat 10, and the bottom part is formed with a tooth groove 321 or a protrusion 322, and the other part is a hexagonal part protruding above the bottom part. The operator uses tools such as a wrench and a socket to act on the hexagonal part to tighten or loosen the locking nut 32.

[0042] As can be seen from the above, the locking member 33 is used to prevent the locking nut 32 from rotating, and the locking nut 32 always remains relatively stationary with the fixing base 10. In order to prevent the fixing bolt 31 from rotating, a limiting hole 11 for the fixing bolt 31 to pass through is opened on the fixing base 10, and its cross-sectional shape is non-circular (such as Figure 2A or a rounded rectangle as shown in 2B). The fixing bolt 31 is Figure 3 The special-shaped bolt shown has a multi-section structure, including a limiting portion 311 inserted in the limiting hole 11, and a threaded portion 312 protruding from the limiting portion 311. The threaded portion 312 is exposed outside the limiting hole 11 and is threadedly engaged with the locking nut 32. The cross-sectional shape of the limiting portion 311 is the same as that of the limiting hole 11. Therefore, the fixing bolt 31 cannot rotate in the limiting hole 11, and it always remains relatively stationary with the fixing seat 10 (unless it is removed manually). Therefore, the fixing bolt 31 and the locking nut 32 also always remain relatively stationary, avoiding the situation where the fixing bolt 31 rotates.

[0043] Preferably, to facilitate disassembly, assembly, and adjustment, in one embodiment, the fixing bolt 31 , the locking nut 32 , and the locking member 33 are exposed outside the housing 40 .

[0044] Furthermore, one end of the fixing bolt 31 on the casing 40 is recessed inward to form a recessed portion 41, and part or all of the locking member 33 and the locking nut 32 are located in the recessed portion 41 to reduce the exposed portion of the first blade 21 and the second blade 22 and improve safety and stability.

[0045] It will be apparent to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims, not the foregoing description, and all variations within the meaning and range of equivalents of the claims are intended to be encompassed within the present invention. Any reference sign in a claim should not be construed as limiting the claim to which it relates.

[0046] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A pruning shear, characterized in that: include: a housing (40) having an installation space formed therein; A fixing base (10) fixed to the housing (40); A blade assembly (20) comprising a first blade (21) and a second blade (22) mounted on the fixing seat and exposed from the housing (40); A fixing assembly, comprising a fixing bolt (31) and a locking nut (32) for fixing the first blade (21) and the second blade (22) to the fixing seat (10), and a locking member (33) fixed to the fixing seat (10), wherein the locking member (33) contacts and blocks the locking nut (32) from rotating, and the fixing assembly further comprises a fixing member fixed to the fixing seat and preventing the locking member (33) from rotating; The driving mechanism is fixed in the installation space and is connected to and drives the first blade (21) and / or the second blade (22) to rotate.

2. The pruning shears according to claim 1, characterized in that A groove (12) is concavely provided on the fixing seat (10), and the locking member (33) is at least partially embedded in the groove (12). The portion of the locking member (33) embedded in the groove (12) is in contact with the side wall of the groove (12), and the side wall of the groove (12) constitutes the fixing member.

3. The pruning shears according to claim 1, characterized in that The fixing member includes a bolt for fixing the locking member (33) to the fixing seat (10).

4. The pruning shears according to claim 1, characterized in that The fixing member comprises a limiting portion (13) or a limiting groove arranged on the fixing seat (10); the limiting portion (13) is distributed on both sides of the locking member (33) rotating in the clockwise and counterclockwise directions, and contacts and prevents the locking member (33) from rotating.

5. The pruning shears according to claim 1, characterized in that A plurality of tooth grooves (321) are recessed on the outer peripheral wall of the locking nut (32), and the locking member (33) includes a pawl (331) extending into the tooth groove (321), and the pawl (331) contacts the side wall of the tooth groove (321).

6. The pruning shears according to claim 5, characterized in that At least two of the ratchets (331) are provided on the locking member (33), and the ratchets (331) extend into the tooth grooves (321) respectively.

7. The pruning shears according to claim 1, characterized in that A plurality of protrusions (322) are projected from the outer peripheral wall of the locking nut (32), and two pawls (331) are projected from the locking member (33) and extend to clamp one of the protrusions (322).

8. The pruning shears according to claim 1, characterized in that The fixing seat (10) is provided with a non-circular limiting hole (11) for the fixing bolt (31) to pass through, and the fixing bolt (31) includes a limiting portion (311) passing through the limiting hole (11), and a threaded portion (312) connected to the limiting portion (311) and threadedly engaged with the locking nut (32), and the limiting portion (311) abuts against the inner wall of the limiting hole (11).

9. The pruning shears according to claim 1, characterized in that The fixing bolt (31), the locking nut (32) and the locking member (33) are exposed from the housing (40); a recessed portion (41) is formed on the housing (40); the recessed portion (41) is arranged at the exposed ends of the first blade (21) and the second blade (22); the locking member (33) and at least a portion of the locking nut (32) are arranged in the recessed portion (41).

10. The pruning shears according to claim 1, characterized in that The fixing seat is also provided with a limiting member for limiting the locking member (33) from being separated from the fixing seat (10), and the limiting member has a first state and a second state. In the first state, the locking member (33) is fixed to the fixing seat (10); in the second state, the locking member (33) is separated from the fixing seat (10).

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