Patent Application
20120137527
1. Field of the Invention
The present invention relates to garden shears with a driving mechanism, and in particular to garden shears utilizing the lever principle and a toothed engagement to economize the force needed for performing a pruning action.
2. Description of the Prior Art
Since branches are suspended in midair, garden shears are a better choice for pruning branches rather than a handsaw. Some branches are, however, too thick and may be located at high positions, and as a result garden shears operated with a simple shearing action are unsatisfactory in this situation because the user has to exert a large force for pruning such branches. Thus, manufacturers in this art propose garden shears having a labor-saving mechanism to make the pruning action easier. However, existing garden shears having a labor-saving mechanism have a complicated structure, and so the production and assembly thereof requires significant time and work, which inevitably raises production costs.
In view of the above, the present inventor proposes a novel and practical garden shears based on his expert experience and diligent research.
Since the conventional labor-saving garden shears has a complicated structure, the production and assembly thereof requires significant time and effort and production costs are consequently high.
In order to solve the above problems, an objective of the present invention is to provide garden shears with a driving mechanism, which includes two cutter bases, an anvil cooperating with the cutter bases, two supporting plates, a cutter plate, and an operating arm. Each of the two cutter bases is provided with at least two positioning holes near its respective center. The upper portion of the cutter base is formed with a lateral opening and a top section located above the lateral opening. A side of the cutter base opposite to the two positioning holes is formed with a pivotal hole. The lower portion of the cutter base is provided with a connecting section. The connecting section is inserted into a handle and fixed thereto. One of the cutter bases is provided with an elongate slot between the positioning hole and the connecting section. The anvil is fixed between the top sections of the two cutter bases. Each of the two supporting plates is provided with a restricting hole and a pivotal hole. When the restricting hole and the pivotal hole of the supporting plate are aligned with the positioning hole and the pivotal hole of the cutter base, the two supporting plates can be sandwiched between the two cutter bases. A roller wheel is sandwiched between the two restricting holes of the two supporting plates. The upper portion of the cutter plate is provided with a cutting blade, and the lower portion of the cutter plate is provided with a positioning slot. An outer edge of the cutter plate is formed with a driven rack oriented to correspond to the positioning slot. The lower portion of the cutter plate is further provided with a fixing portion corresponding to the elongate slot of the cutter base. A pull lever is connected to the fixing portion of the cutter plate. One end of the operating arm is provided with a pivotal hole, and an arc-shaped driving toothed edge is formed on this end of the operating arm by using the pivotal hole as a center of circle. The other end of the operating arm is connected to an operating handle. The two cutter bases face each other in such a manner that the positioning holes of one cutter base are aligned with those of the other cutter base, thereby forming an accommodating space therebetween. The anvil and the two supporting plates are sandwiched between the two cutter bases. The anvil is fixed to the top sections of the two cutter bases. The restricting hole and the pivotal hole of the supporting plate are respectively aligned with the positioning hole and the pivotal hole of the cutter base, so that the two supporting plates can be fixed between the two cutter bases. Further, the cutter plate and the operating arm are sandwiched between the two supporting plates. The roller wheel is disposed in the positioning slot and sandwiched by the restricting holes of the two supporting plates, so that the cutter blade can move upwards or downwards relative to the supporting plates. The pivotal hole of the operating arm is pivotally connected between the pivotal holes of the two supporting plates in such a manner that the driving toothed edge of the operating arm is drivingly engaged with the driven rack of the cutter plate. The pull lever is fixed to the fixing portion through the elongate slot of the cutter base. With the above structure, the garden shears with a driving mechanism according to the present invention is obtained.
The primary components of the present invention only include two cutter bases, an anvil, a cutter plate and an operating arm. Thus, the present invention has reduced components and costs. Further, the operating handle extends the action arm of the operating arm when the driving toothed edge of the operating arm drives the driven rack of the cutter plate. Thus, the present invention is simple in structure and labor-saving.
Furthermore, the roller wheel is positioned between the restricting holes of the two supporting plates to slide in the positioning slot of the cutter plate. Thus, when the cutter blade is driven by the operating arm to move upwards or downwards, the movement of the cutter plate is smoother due to the rolling of the roller wheel, thereby facilitating the cutting action of the cutter plate.
In order to better understand the objectives, features and effects of the present invention, a detailed description will be made hereinafter with reference to the accompanying drawings.
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After the article is cut off, the user repeats to pull open the operating arm (50) away from the handle (16), so that the cutter plate (40) is driven to move downwards to uncover the lateral openings (12). Thus, the pruning action can be continuously performed.
Please refer to
The present invention has the following advantageous features:
(I) The primary components of the present invention include only two cutter bases (10), an anvil (20), a cutter plate (40) and an operating arm (50). Thus, the present invention has reduced components and costs. Further, the operating handle (53) extends the action arm of the operating arm (50) when the driving toothed edge (52) of the operating arm (50) drives the driven rack (43) of the cutter plate (40). Thus, the present invention is simple in structure and provides labor-saving benefits; and
(II) The roller wheels (33) positioned between the restricting holes (31) of the two supporting plates (30) slide in the positioning slot (42) of the cutter plate (40). Thus, when the cutter blade (40) is driven by the operating arm (50) to move upwards or downwards, the movement of the cutter plate (40) is smooth due to the rolling of the roller wheels (33), thereby facilitating the cutting action of the cutter plate (40).
According to the above, the present invention really demonstrates industrial applicability, novelty and inventive steps, and thus conforms to the requirements for an invention patent.
Although the present invention has been described with reference to the foregoing preferred embodiment, it will be understood that the invention is not limited to the details thereof. Various equivalent variations and modifications can still occur to those skilled in this art in view of the teachings of the present invention. Thus, all such variations and equivalent modifications are also embraced within the scope of the invention as defined in the appended claims.
