DIGGING APPARATUS |
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申请号 | EP17162856.3 | 申请日 | 2017-03-24 | 公开(公告)号 | EP3379019A1 | 公开(公告)日 | 2018-09-26 |
申请人 | TTI (Macao Commercial Offshore) Limited; | 发明人 | Wong, Wai For; Tyson, Mark; Cameron Andrew; | ||||
摘要 | A digging apparatus (10) is disclosed as including a handle assembly (14, 14a), a motor (32), a main switch (22) electrically connected with the motor, the main switch being movable between a first position in which operation of the motor is allowed and a second position in which operation of the motor is prevented, and a drilling bit (88, 88a) drivenable by the motor, the drilling bit having a longitudinal axis (P-P, M-M), and when the switch member is in the first position, the motor is adapted to drive the drilling bit to rotate about the longitudinal axis in a clockwise direction in response to pushing of the handle assembly in a direction towards the drilling bit, and the motor is adapted to drive the drilling bit to rotate about the longitudinal axis in an anti-clockwise direction in response to pulling of the handle assembly in a direction away from the drilling bit. | ||||||
权利要求 | |||||||
说明书全文 | This invention relates to a digging apparatus, and in particular such a digging apparatus suitable, but not exclusively, for digging into soil. Most commercially available digging apparatus include a motor driving a rotatable drilling bit. Some such apparatus only allow one-way drilling, i.e. rotation of the drilling bit in one direction only. They therefore do not allow for reverse rotation of the drilling bit, which is in fact a desirable feature as it helps the drilling bit out of the substrate being drilled or dug, e.g. soil. While some digging apparatus allow choice of drilling direction by pressing a button, it would mean that a user has to press a button every time he/she wants to change the drilling direction of the drilling bit. In addition, most existing mechanisms allowing releasable engagement of drilling bits to a digging apparatus are complex to manufacture and operate, and may also require the use of other tools. Furthermore, most existing digging apparatus have a closed-loop handle. Such a kind of handle suffers from the drawback that, when kickback occurs, a hand or hands of a user may be easily hit by such a closed-loop handle. It is thus an object of the present invention to provide a digging apparatus and a digging tool for a digging apparatus in which the aforesaid shortcomings are mitigated, or at least to provide useful alternatives to the trade and public. According to a first aspect of the present invention, there is provided a digging apparatus including a handle assembly, a motor, a switch member electrically connected with said motor, said switch member being movable between a first position in which operation of said motor is allowed and a second position in which operation of said motor is prevented, and a digging tool drivenable by said motor, said digging tool having a longitudinal axis, characterized in that, when said switch member is in said first position, said motor is adapted to drive said digging tool to rotate about said longitudinal axis in a first rotational direction in response to movement of said handle assembly in a first direction, and said motor is adapted to drive said digging tool to rotate about said longitudinal axis in a second rotational direction which is opposite to said first rotational direction in response to movement of said handle assembly in a second direction which is substantially opposite to said first direction. In use, when said switch member is in said first position, and in response to movement of said handle assembly in said first direction, said motor may be adapted to drive said digging tool to rotate about said longitudinal axis in said first rotational direction to move said digging apparatus in said first direction. In use, when said switch member is in said first position, and in response to movement of said handle assembly in said second direction, said motor may be adapted to drive said digging tool to rotate about said longitudinal axis in said second rotational direction to move said digging apparatus in said second direction. Said apparatus may include an electric circuit connecting said switch member, said motor and an auxiliary switch assembly, and, when said switch member is in said first position, and in response to movement of said handle assembly in said first direction, said auxiliary switch assembly may be adapted to close said electric circuit in a first configuration to operate said motor to drive said digging tool to rotate about said longitudinal axis in said first rotational direction. When said switch member is in said first position, and in response to movement of said handle assembly in said second direction, said auxiliary switch assembly may be adapted to close said electric circuit in a second configuration to operate said motor to drive said digging tool to rotate about said longitudinal axis in said second rotational direction. Said auxiliary switch assembly may include a first auxiliary switch which, when said switch member is in said first position and in response to movement of said handle assembly in said first direction, may be adapted to close said electric circuit in said first configuration. Said auxiliary switch assembly may include a second auxiliary switch which, when said switch member is in said first position and in response to movement of said handle assembly in said second direction, may be adapted to close said electric circuit in said second configuration. Said first auxiliary switch may comprise a first sliding switch. Said second auxiliary switch may comprise a second sliding switch. Said first direction may be from said handle assembly to said digging tool and may be substantially parallel to said longitudinal axis of said digging tool. Said handle assembly may include two handle portions each with a free end, and said free ends of said handle portions may point towards generally opposite directions. Said handle assembly may be of a generally S-shape. Said switch member may be on one of said handle portions. Said digging tool may be releasably connected with said motor. Said digging tool may include a body with markings thereon for indicating a depth of penetration of said digging tool into a substrate. Said digging tool may include a first longitudinal end for penetrating into a substrate and an opposite second longitudinal end for releasable connection with an engagement mechanism of said digging apparatus. Said digging tool may include a hollow connection part adjacent said second longitudinal end. Said hollow connection part may include two through-holes with their central longitudinal axes aligned with each other. Said engagement mechanism may include a male member adapted to be inserted into said hollow connection part of said digging tool. Said male member of said engagement mechanism may include two pin members with their central longitudinal axes aligned with each other. Said pin members may be movable towards each other to a compressed position and away from each other to an extended position. Said pin members may be biased towards said extended position. When said digging tool is connected with said engagement mechanism, said pin members of said male member of said engagement mechanism may be in said extended position and may be at least partly received through said through-holes of said hollow connection part of said digging tool to prevent disengagement of said digging tool from said engagement mechanism. When said digging tool is connected with said engagement mechanism, said pin members of said male member of said engagement mechanism may be movable from said extended position to said compressed position to allow disengagement of said digging tool from said engagement mechanism. Said male member of said engagement mechanism may be of a generally square cross-section. Said hollow connection part of said digging tool may have a cavity of a generally square cross-section. According to a second aspect of the present invention, there is provided a digging tool for a digging apparatus, said digging tool including a body with a plurality of markings thereon for indicating a depth of penetration of said digging tool into a substrate. According to a third aspect of the present invention, there is provided a digging tool for a digging apparatus, said digging tool including a first longitudinal end for penetrating into a substrate, an opposite second longitudinal end for releasable connection with a digging apparatus, and a hollow connection part adjacent said second longitudinal end, wherein said hollow connection part includes two through-holes with their central longitudinal axes aligned with each other. A digging apparatus and a digging tool according to the present invention will now be described, by way of examples only, with reference to the accompany drawings, in which:
A main switch 22 is provided on the handle portion 18a, to be manually operable by a user. The main switch 22 may be moved between an "ON" position and an "OFF" position. When the main switch 22 is in the "OFF" position, the motor (to be discussed below) of the digging apparatus 10 is prevented from being operated. When the main switch 22 is in the "ON" position, the motor of the digging apparatus 10 may be operated upon activation of a switch mechanism to be discussed below. As shown in As shown in As shown in more detail in According to the present invention, a drilling bit is releasably connected with and driven by the motor 32 via the output shaft 16 of the main body 12 to form the digging apparatus 10. To operate the digging apparatus 10, the main switch 22 is moved (e.g. by moving the push button 28) from the "OFF" position to and remain at the "ON" position to activate the micro-switch 30. A user holding the handle assembly 14 of the digging apparatus 10 then moves (e.g. pushes) the handle assembly 14 in a direction parallel to the central longitudinal axis L-L of the digging apparatus 10 and from the handle assembly 14 towards the output shaft 16 (and thus towards the drilling bit), as shown by the arrow D in If desired, the user may (while maintaining the main switch 22 in the "ON" position) move (e.g. pull) the handle assembly 14 in a direction opposite to that indicated by the arrow D in By way of the aforesaid arrangement of the digging apparatus 10 according to the present invention, auto selection of forward/rearward movement of the digging apparatus 10 into and out of the substrate to be dug is allowed. This enables the user to finish the work quicker as there is no need to manually push any button to select the direction of rotation of the drilling bit (and thus the direction of movement of the digging apparatus 10. Such an auto selection of forward/rearward movement of the digging apparatus 10 also fits in with human habit, as, normally, a user pushes the digging apparatus 10 downward if he/she wants to dig deeper, and the user pulls the digging apparatus 10 upward if he/she wants to retrieve the digging apparatus 10. Such a feature also allows the user to cause the drilling bit to drill back and forth in the substrate more easily and conveniently, without having to push any button manually. It should be noted that the motor 32 can only operate either when both the main switch 22 and the first slide switch 52 are simultaneously activated, or when both the main switch 22 and the second slide switch 54 are simultaneously activated. Such an arrangement enhances the safety in use of the digging apparatus 10. Thus, in a way, the main switch 22 acts as a safety switch. The upper end 102 (i.e. the longitudinal end opposite the tip 110) of the drilling bit 88 has a hollow connection part 112 with a cavity of a square cross-section sized and configured to receive a part of a male member 114 of the engagement mechanism 104, which male member 114 also being of a square cross-section. The hollow connection part 112 of the drilling bit 88 has a pair of through holes with their central longitudinal axes aligned with each other. The male member 114 includes two pins 116 with their central longitudinal axes aligned with each other. The pins 116 are movable towards each other to a compressed position and away from each other to an extended position. The pins 116 are biased towards the extended position by a spring 118. When the drilling bit 88 is connected with the engagement mechanism 104, in which the male member 114 is received within the hollow connection part 112 of the drilling bit 88, the pins 116 are in the extended position and are partly received through the through-holes of the hollow connection part 112 of the drilling bit 88 to prevent disengagement of the drilling bit 88 from the engagement mechanism 104. If desired, the pins 116 may be movable (e.g. by manually compressing the pins 116 towards each other, and against the biasing force of the spring 118) to the compressed position, in which the pins 116 are clear of the through holes of the hollow connection part 112 of the drilling bit 88, to allow disengagement of the drilling bit 88 from the engagement mechanism 104, thus allowing disconnection of the drilling bit 88 from the main body 12. Most existing drilling bit locking mechanism makes use of a pin and key. It is time consuming to change the drilling bit. Since the drilling bit is long, it is difficult to align the hole for insertion of the pin and key. There is also the risk of losing the pin or key. On the other hand, the arrangement discussed above allows for easy and convenient connection and disconnection of the drilling bit 88 with and from the main body 12 of the digging apparatus 10, without requiring the use of any tool or accessory. It should be understood that the above only illustrates and describes an example whereby the present invention may be carried out, and that modifications and/or alterations may be made thereto without departing from the spirit of the invention. It should also be understood that certain features of the invention, which are, for clarity, described in the context of separate embodiments, may be provided in combination in a single embodiment. Conversely, various features of the invention which are, for brevity, described in the context of a single embodiment, may also be provided separately or in any appropriate sub-combinations. |