WO2017185478A1 - Multifunctional tool and core structure thereof - Google Patents

Multifunctional tool and core structure thereof Download PDF

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Publication number
WO2017185478A1
WO2017185478A1 PCT/CN2016/084705 CN2016084705W WO2017185478A1 WO 2017185478 A1 WO2017185478 A1 WO 2017185478A1 CN 2016084705 W CN2016084705 W CN 2016084705W WO 2017185478 A1 WO2017185478 A1 WO 2017185478A1
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WO
WIPO (PCT)
Prior art keywords
eccentric wheel
reciprocating movement
core structure
central frame
movement platform
Prior art date
Application number
PCT/CN2016/084705
Other languages
French (fr)
Inventor
Shige CHEN
Xiwan SONG
Gongjun LU
Original Assignee
Hangzhou Lutz Technology Co., Ltd.
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Hangzhou Lutz Technology Co., Ltd. filed Critical Hangzhou Lutz Technology Co., Ltd.
Publication of WO2017185478A1 publication Critical patent/WO2017185478A1/en

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    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/02—Secateurs; Flower or fruit shears
    • A01G3/033—Secateurs; Flower or fruit shears having motor-driven blades
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01G—HORTICULTURE; CULTIVATION OF VEGETABLES, FLOWERS, RICE, FRUIT, VINES, HOPS OR SEAWEED; FORESTRY; WATERING
    • A01G3/00—Cutting implements specially adapted for horticultural purposes; Delimbing standing trees
    • A01G3/04—Apparatus for trimming hedges, e.g. hedge shears
    • A01G3/047—Apparatus for trimming hedges, e.g. hedge shears portable
    • A01G3/053—Apparatus for trimming hedges, e.g. hedge shears portable motor-driven

Definitions

  • the present utility model relates to a multifunctional tool and a core structure thereof.
  • the multifunctional tool can perform operations such as shearing, cutting, sawing and the like by replacing its working assembly with a different one.
  • Tools such as a pruner, a weeder and a reciprocating saw driven by a power mechanism (for example, an electric motor) have been widely employed. These tools have a common characteristic in which they have a work executing element that can perform rectilinear reciprocating movement or reciprocating swinging movement and that is in direct contact with object (s) to be processed such as branches or lawns.
  • a power mechanism for example, an electric motor
  • the pruner as a main pruning tool for a shrubby green belt usually comprises a casing with a front handle and a rear handle, a core structure housed in the casing, and a pruning cutter blade assembly as a working assembly located on a front side (the side away from a user of the pruner) .
  • the core structure mainly includes a central frame, a power mechanism and a transmission system.
  • Fig. 6 is a sectional view showing a core structure of a conventional pruner in the prior art and a part of a pruning cutter blade assembly cooperating with the core structure. As shown in Fig.
  • the pruning cutter blade assembly is mainly constituted by a support beam 103’as well as an upper cutter blade 101’and a lower cutter blade 102’as a work executing element. Rear ends of the upper cutter blade 101’and the lower cutter blade 102’encase (envelop) the upper eccentric wheel 333 and the lower eccentric wheel 334 respectively.
  • the upper cutter blade 101’and the lower cutter blade 102’ are driven to make reciprocating movement forward and backward by the eccentric rotation of the upper eccentric wheel 333 and the lower eccentric wheel 334 so that branches are trimmed by a shearing effect of serrated edges (not shown) on both sides of front portions of the two blades.
  • the eccentric wheel shaft 212, a gear shaft 213 and a number of fixation shafts (not shown) can extend through respective holes opened in a bottom plate 29’and be fixed by corresponding nuts 6C or the like.
  • the pruning cutter blade assembly is also connected to the central frame through a bolt 108A’with a washer 109A’and a bolt 108B’with a washer 109B’.
  • the conventional pruner mentioned above is mainly disadvantageous in its single function such that it can only be used for pruning or shearing but can not be used for saw-cutting or weeding and the pruning cutter blade assembly thereof is not replaceable or is troublesome to be replaced. If the pruning cutter blade assembly is required to be replaced, it is at least required that the whole pruner is inverted upside down, the nuts or other connecting elements are screwed off the bottom plate 29’by a spanner, the whole bottom plate 29’is removed, the bolts 108A’, 108B’and the pruning cutter blade assembly are dismounted; then a new pruning cutter blade assembly is mounted, the bottom plate 29’, the nuts and the bolts 108A’, 108B’are remounted; finally the pruner is inverted back, and the overall procedure is time-consuming and laborsome.
  • lubricating oil (grease) is usually applied into the transmission system to reduce wear and noise, and the lubricating oil (grease) is liable to be leaked onto the pruning cutter blade assembly and the bottom plate 29’.
  • the user’s hands are very likely to be contaminated by the lubricating oil (grease) and a rear end of the dismounted pruning cutter blade assembly is also adhered with the lubricating oil (grease) so that further cleaning is demanded.
  • non-dismountability of the pruning cutter blade assembly also leads to problems such as excessively large packaging sizes, inconvenient handing and the like.
  • a pruner capable of replacing its cutter is disclosed in Chinese utility model publication No. 202425365U that has been granted.
  • the pruner comprises a working module and a power module.
  • the working module includes a transmission gearbox and a pruning cutter, and the power module is detachably connected to the transmission gearbox.
  • the pruning cutter is to be replaced, only the working module is required to be replaced and the whole pruner need not be replaced.
  • the transmission gearbox needs to be replaced along with the pruning cutter, and thus it is high in cost and is not practical.
  • the present utility model aims to provide a multifunctional tool and a core structure thereof, and the multifunctional tool enables easy and convenient replacement of working assemblies with different functions and specifications so as to perform operations such as shearing, cutting, sawing and the like.
  • the present utility model provides a core structure of a multifunctional tool, the core structure comprises: a central frame that includes an extension located in a front portion of the central frame; a power mechanism that is mounted to the central frame; and a transmission system that is mounted to the central frame, wherein the core structure further comprises a reciprocating movement platform, the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection interface being entirely located within the extension, and the transmission system transmits power output by the power mechanism to the reciprocating movement platform so that the reciprocating movement platform makes reciprocating movement (rectilinear reciprocating movement) forward and backward with respect to the central frame and drives the work executing element connected to the connection interface to make desired movement.
  • the core structure further comprises a reciprocating movement platform, the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection
  • the transmission system includes an eccentric wheel
  • the power output by the power mechanism is converted into rotation of the eccentric wheel
  • the reciprocating movement platform encases the eccentric wheel
  • the reciprocating movement platform is caused to make reciprocating movement forward and backward by the rotation of the eccentric wheel.
  • a middle portion of the reciprocating movement platform encases the eccentric wheel, a front side and a rear side of the reciprocating movement platform relative to the eccentric wheel are supported and guided by support-guide assemblies fixed to the central frame respectively, and the reciprocating movement platform is supported to the central frame by the support-guide assemblies and guided to make reciprocating movement forward and backward by the support-guide assemblies.
  • an elongated hole is opened in the reciprocating movement platform at a position corresponding to each of the support-guide assemblies, and each of the support-guide assemblies passes through its corresponding elongated hole.
  • the eccentric wheel includes a first eccentric wheel and a second eccentric wheel which are mounted to a common eccentric wheel shaft such that the first eccentric wheel and the second eccentric wheel are angularly offset from each other by 180 degrees
  • the reciprocating movement platform includes an upper reciprocating plate and a lower reciprocating plate which encase the first eccentric wheel and the second eccentric wheel respectively, and thus when the first eccentric wheel and the second eccentric wheel are rotated at the same velocity under the driving of the power mechanism, the first eccentric wheel and the second eccentric wheel respectively drive the upper reciprocating plate and the lower reciprocating plate to make reciprocating movement forward and backward with an angular offset of 180 degrees.
  • connection interface on the front end of the reciprocating movement platform includes a circular cylinder which is provided to a lower surface of the upper reciprocating plate and a circular cylinder which is provided to an upper surface of the lower reciprocating plate.
  • a U-shaped groove to be connected to the circular cylinders is formed in the rear end of the work executing element of the working assembly.
  • the power mechanism is an electric motor
  • the transmission system is a gear set which includes one or more gears.
  • the central frame is fixedly connectable to a support beam of various working assemblies through a fastening structure.
  • a gate member which is openable and closable is provided to the central frame at a relative front position of the central frame, and the gate member shields or exposes the connection interface.
  • the gate member is positioned on a side surface of the central frame.
  • configurations which are complementary to a sectional shape of a support beam of various working assemblies are formed on an inner side of the gate member and an inner side of the extension respectively.
  • through holes are provided in the gate member, and the gate member is fixed to the central frame by screws passing through the through holes and screwed into the central frame when the gate member is closed, the screws being able to pass through via holes in a support beam of various working assemblies.
  • the present utility model further provides a multifunctional tool, and the multifunctional tool comprises the core structure mentioned above and at least one of the working assemblies.
  • the working assemblies include a reciprocating saw blade assembly, a weeding shearer assembly, and a pruning cutter blade assembly.
  • the multifunctional tool further includes a housing and a gripping operation element, and at least a part of the core structure is disposed in the housing.
  • the gripping operation element includes a front handle and/or a rear handle, wherein at least one handle is rotatable and/or replaceable to accommodate requirements for an optimum working orientation of different working assemblies.
  • the reciprocating movement platform which makes reciprocating movement forward and backward is used in the present utility model to be connected to the work executing element of various working assemblies so that the position of the connection interface is forwardly moved into the extension (the front portion of the central frame) and the working assemblies with different functions and specifications can be replaced simply and conveniently.
  • Fig. 1 is an exploded perspective view showing a part of a core structure of a multifunctional tool according to a preferred embodiment of the present utility model
  • Fig. 2A is a bottom view showing the core structure of the multifunctional tool according to the preferred embodiment of the present utility model and a part of a pruning cutter blade assembly cooperating with the core structure;
  • Fig. 2B is a side sectional view taken along a line B-B in Fig. 2A;
  • Fig. 3 is an enlarged sectional view showing details of a rear support-guide assembly in the core structure shown in Figs. 2A and 2B;
  • Figs. 4A and 4B are perspective views showing the core structure of the multifunctional tool according to the preferred embodiment of the present utility model and a part of the pruning cutter blade assembly cooperating with the core structure, wherein Fig. 4A shows a gate member in an opened state, and Fig. 4B shows the gate member in a closed state;
  • Fig. 5 is a perspective view showing a reciprocating saw blade assembly, a weeding shearer assembly and the pruning cutter blade assembly capable of cooperating with the core structure of the multifunctional tool according to the preferred embodiment of the present utility model;
  • Fig. 6 is an enlarged sectional view showing a core structure of a conventional pruner in the prior art and a part of a pruning cutter blade assembly cooperating with the core structure.
  • a “front-rear direction” means an extending direction (a lengthwise direction) of a working assembly (for example, a pruning cutter blade assembly) (also a lengthwise direction of a multifunctional tool) , wherein a direction in which the working assembly protrudes from the core structure is referred to as a front direction, and a direction in which the working assembly retracts to the core structure is referred to as a rear direction; a “left-right direction” means a widthwise direction of the multifunctional tool; a “up-down direction” means a height direction of the multifunctional tool.
  • One of the front-rear direction, the left-right direction and the up-down direction is orthogonal to other two directions. Further, the identical components and configurations are indicated by the identical reference numerals.
  • Fig. 1 is an exploded perspective view showing a part of a core structure of a multifunctional tool according to a preferred embodiment of the present utility model.
  • Fig. 2A is a bottom view showing the core structure and a part of a pruning cutter blade assembly cooperating with the core structure, and
  • Fig. 2B is a side sectional view taken along a line B-B in Fig. 2A.
  • the core structure in the preferred embodiment also has a central frame, a power mechanism (an electric motor in the present embodiment) and a transmission system.
  • the central frame is mainly constituted by a body 21 and an extension 22 (as a base to fix various working assemblies) located in front of the body 21.
  • An electric motor bracket 211 for mounting the electric motor (not shown) and an electric motor holding structure (not shown) are provided in an upper portion of the body 21.
  • An output toothed shaft (not shown) of the electric motor extends downward through a hole 218 in the electric motor bracket 211, and is connected to the transmission system.
  • the transmission system includes a primary bull gear 312 and a secondary pinion gear 313 which are respectively rotatably mounted to a primary gear shaft 213 as well as a secondary bull gear 322 and an eccentric wheel assembly 33 which are respectively rotatably mounted to an eccentric wheel shaft (also serving as a secondary gear shaft) 212.
  • the output toothed shaft of the electric motor meshes with the primary bull gear 312 to drive the primary bull gear 312 to be rotated.
  • the primary bull gear 312 and the secondary pinion gear 313 are fixed with each other and rotated around the primary gear shaft 213 together.
  • the secondary pinion gear 313 meshes with the secondary bull gear 322.
  • the secondary bull gear 322 is integrally formed with a sleeve 321.
  • the eccentric wheel assembly 33 includes the following elements in an order from top to bottom: a journal 331 which is inserted and fixed (for example, by interference fit) into a center hole of the bull gear 322 (or a center hole of the sleeve 321) , a collar 332, as well as an upper eccentric wheel 333 and a lower eccentric wheel 334 which are angularly offset from each other by 180 degrees.
  • the eccentric wheel assembly 33 and the bull gear 322 are rotated around the eccentric wheel shaft 212 together.
  • the core structure in the preferred embodiment further includes a reciprocating movement platform.
  • the reciprocating movement platform includes an upper reciprocating plate 41 and a lower reciprocating plate 42.
  • Waist-shaped holes 43 and 44 which extend in a transverse direction of the upper reciprocating plate 41 and the lower reciprocating plate 42 (a left-right direction of the multifunctional tool) are respectively opened in middle portions in a longitudinal direction of the upper reciprocating plate 41 and the lower reciprocating plate 42 (a front-rear direction of the multifunctional tool) .
  • the upper reciprocating plate 41 encases (envelops) the upper eccentric wheel 333 through the waist-shaped hole 43
  • the lower reciprocating plate 42 encases (envelops) the lower eccentric wheel 334 through the waist-shaped hole 44.
  • a circular cylinder 45 which projects downward from a lower surface of a front end of the upper reciprocating plate 41 is provided to the lower surface
  • a circular cylinder 46 which projects upward from an upper surface of a front end of the lower reciprocating plate 42 is provided to the upper surface.
  • the circular cylinders 45 and 46 act as a connection interface of the reciprocating movement platform (will be described in detail hereinafter) which is to be connected to a work executing element of various working assemblies.
  • the circular cylinders 45 and 46 are entirely located within the extension 22 of the central frame.
  • the extension 22 has a side guard plate 222 on one side (for example, the left side) thereof.
  • the core structure of the preferred embodiment includes a front support-guide assembly and a rear support-guide assembly for supporting and guiding the reciprocating movement platform.
  • the front support-guide assembly includes a front guide bar 215A provided in a front portion of the body 21 as well as a bush 51A and washers 52A, 53A cooperating with the front guide bar 215A.
  • the rear support-guide assembly includes a rear guide bar 215B provided in a rear portion of the body 21 as well as a bush 51B and washers 52B, 53B cooperating with the rear guide bar 215B.
  • the front guide bar 215A and the rear guide bar 215B are bolts provided in the body 21.
  • elongated holes 47A, 47B which extend in the front-rear direction of the multifunctional tool are opened in the upper reciprocating plate 41 on front and rear sides of the waist-shaped hole 43 respectively, and elongated holes 48A, 48B which extend in the front-rear direction of the multifunctional tool are opened in the lower reciprocating plate 42 on front and rear sides of the waist-shaped hole 44 correspondingly. All of the elongated holes 47A, 47B, 48A and 48B may be waist-shaped holes.
  • the front guide bar 215A passes through the washer 52A, the elongated hole 47A, the bush 51A, the elongated hole 48A and the washer 53A in order.
  • the rear guide bar 215B passes through the washer 52B, the elongated hole 47B, the bush 51B, the elongated hole 48B and the washer 53B in order.
  • the core structure of the preferred embodiment includes a bottom plate 29 for integrally connecting the central frame, the transmission system and the reciprocating movement platform.
  • the bottom plate 29 is located below the body 21 of the central frame and provided with holes 29A to 29E.
  • the front guide bar 215A and the rear guide bar 215B have threads on their lower ends. The lower ends of the front guide bar 215A and the rear guide bar 215B respectively pass through the holes 29A, 29B to mate with nuts 6A, 6B so that the front and rear support-guide assemblies are clamped and fixed between the body 21 and the bottom plate 29.
  • the secondary gear shaft (eccentric wheel shaft) 212, the primary gear shaft 213, and a fixation shaft 216 on the body 21 respectively pass through the holes 29C, 29E, 29D, and may be fixed by corresponding nuts (not shown) .
  • Fig. 3 is an enlarged sectional view showing details of the rear support-guide assembly.
  • small diameter portions 511B and 512B are respectively formed in upper and lower portions of the bush 51B, and a large diameter portion 513B is formed in a middle portion of the bush 51B.
  • Outer diameters of the small diameter portions 511B and 512B are equal to or slightly smaller than transverse widths of the elongated holes 47B and 48B respectively. Heights of the small diameter portions 511B and 512B are slightly larger than thicknesses of the upper reciprocating plate 41 and the lower reciprocating plate 42.
  • An outer diameter of the large diameter portion 513B is larger than the transverse widths of the elongated holes 47B and 48B.
  • a height of the large diameter portion 513B is larger than a sum of heights of the circular cylinders 45 and 46.
  • movements of the upper reciprocating plate 41 and the lower reciprocating plate 42 are respectively guided by the small diameter portions 511B and 512B, and the upper reciprocating plate 41 and the lower reciprocating plate 42 are respectively supported by an upper surface 514B of the larger diameter portion 513B and the washer 53B.
  • the front support-guide assembly may have a configuration the same as that of the rear support-guide assembly.
  • a gate connection shaft 217 is provided on a right side of a front end of the body 21, and a side gate 7 as an example of a gate member which is openable and closable is pivotably connected to the gate connection shaft 217 (that is, the side gate 7 can be horizontally rotated around the gate connection shaft 217) .
  • Figs. 4A and 4B respectively show the core structure and a part of a pruning cutter blade assembly cooperating with the core structure in a state in which the gate member is opened and a state in which the gate member is closed.
  • the side gate 7 includes a gate top plate 71, a gate side plate 72 and a gate bottom plate 73.
  • a wedge shaped lug 74 is provided on an inner side of the gate side plate 72. Through holes 76A and 76B which penetrate through the gate side plate 72 and the wedge shaped lug 74 are provided in the wedge shaped lug 74. A reinforcement rib 75 may be provided on the gate bottom plate 73.
  • Wedge shaped lugs 223 to 225 are also provided on an inner side of the side guard plate 222 of the extension 22. Screw holes 223A and 225A are opened in the wedge shaped lugs 223 and 225 respectively.
  • Fig. 5 is a perspective view showing working assemblies capable of cooperating with the core structure according to the preferred embodiment.
  • the working assemblies may include a reciprocating saw blade assembly 8 used for sawing or cutting, a weeding shearer assembly 9 used for weeding and a pruning cutter blade assembly 10 used for pruning and the like.
  • a description will be given below with the pruning cutter blade assembly 10 as an example.
  • the pruning cutter blade assembly 10 includes a support beam 103 as well as an upper cutter blade 101 and a lower cutter blade 102 as a movable work executing element.
  • a U-shaped groove (opening) 104 which extends in a transverse direction of the upper cutter blade 101 (the left-right direction of the multifunctional tool) and can be connected to the circular cylinder 45 of the upper reciprocating plate 41 is provided on a rear end of the upper cutter blade 101, and a U-shaped groove (opening) 105 which extends in a transverse direction of the lower cutter blade 102 (the left-right direction of the multifunctional tool) and can be connected to the circular cylinder 46 of the lower reciprocating plate 42 is provided on a rear end of the lower cutter blade 102.
  • elongated holes 106A, 106B or the like which extend in the front-rear direction of the multifunctional tool are provided in the upper cutter blade 101
  • elongated holes 107A, 107B or the like which extend in the front-rear direction of the multifunctional tool are provided in the lower cutter blade 102.
  • Screw holes 109A, 109B, 109C or the like which extend the up-down direction of the multifunctional tool are correspondingly provided in the support beam 103.
  • the upper cutter blade 101 and the lower cutter blade 102 are connected to the support beam 103 in a manner in which they are slidable with respect to one another (in the front-rear direction of the multifunctional tool) by bolts (not shown) or the like which pass through corresponding elongated holes and corresponding screw holes.
  • Via holes 108A and 108B which extend in the left-right direction of the multifunctional tool are provided in middle portions of side surfaces on both ends of the support beam 103.
  • the support beam 103 has an H-shaped cross section, and a left notch and a right notch 103A forming the H-shaped cross section have shapes that are complementary to the wedge shaped lugs 223 to 225 on the extension 22 and the wedge shaped lug 74 on the side gate 7 respectively.
  • the upper circular cylinder 45 of the reciprocating movement platform is inserted into and engaged with the U-shaped groove 104 of the pruning cutter blade assembly 10, and the lower circular cylinder 46 of the reciprocating movement platform is inserted into and engaged with the U-shaped groove 105 of the pruning cutter blade assembly 10.
  • the side gate 7 is closed.
  • the wedge shaped lug 74 on the side gate 7 abuts against the right notch 103A of the support beam 103, and the wedge shaped lugs 223 to 225 on the extension 22 abut against the left notch of the support beam 103.
  • Screw stems (not shown) of fastening knobs capable of being manually screwed or fastening bolts, as an example of a fastening structure pass through the corresponding through holes 76A, 76B in the gate side plate 72 and the corresponding via holes 108A, 108B in the support beam 103 from an outer side of the gate side plate 72 and are fixed into the corresponding screw holes 223A, 225A of the side guard plate 222. This configuration ensures that the support beam 103 can be stably secured to the central frame.
  • the upper eccentric wheel 333 and the lower eccentric wheel 334 drive the upper reciprocating plate 41 and the lower reciprocating plate 42 to make reciprocating movement (rectilinear reciprocating movement) forward and backward with an angular offset of 180 degrees relative to each other through the waist-shaped hole 43 of the upper reciprocating plate 41 and the waist-shaped hole 44 of the lower reciprocating plate 42 respectively.
  • the upper reciprocating plate 41 drives the upper cutter blade 101 to make reciprocating movement forward and backward through the circular cylinder 45 and the U-shaped groove 104
  • the lower reciprocating plate 42 drives the lower cutter blade 102 to make reciprocating movement forward and backward through the circular cylinder 46 and the U-shaped groove 105.
  • a middle portion of the reciprocating movement platform (the upper reciprocating plate 41 and the lower reciprocating plate 42) encases the eccentric wheels 333, 334, and a front side and a rear side of the reciprocating movement platform relative to the eccentric wheels 333, 334 are supported and guided by the support-guide assemblies fixed to the central frame.
  • the current working assembly can be removed via the upper circular cylinder 45 and/or the lower circular cylinder 46 conveniently as long as the fastening bolts or the fastening knobs are screwed off the screw holes 223A, 225A from the outer side of the side gate 7 to open the side gate 7 and expose the upper circular cylinder 45 and the lower circular cylinder 46.
  • a U-shaped groove 81 of the reciprocating saw blade assembly 8 on a rear end thereof is only required to be engaged with one of the circular cylinder 45 of the upper reciprocating plate 41 and the circular cylinder 46 of the lower reciprocating plate 42. Accordingly, in operation, the other of the upper reciprocating plate 41 and the lower reciprocating plate 42 that is not engaged with the reciprocating saw blade assembly 8 is in an idle state. Further, a U-shaped groove 91 opened in an inclined manner is formed on a rear end of the weeding shearer assembly 9. In this case, the front-rear reciprocating movement of the circular cylinders 45 and 46 is converted into the left-right swinging of a weeding cutter blade so as to realize a transverse shearing function.
  • the multifunctional tool in addition to the core structure and the working assemblies, the multifunctional tool according to the preferred embodiment further includes a housing and a gripping operation element (both are not shown) .
  • the gripping operation element is a front handle, a rear handle or the like.
  • the front handle and the rear handle are made to be rotatable and/or replaceable to accommodate requirements for an optimum working orientation of different working assemblies.
  • At least a part of the core structure is disposed in the housing.
  • the power output by the power mechanism is converted into the rotation of the eccentric wheel and the reciprocating movement platform is caused to make reciprocating movement forward and backward by the rotation of the eccentric wheel in the preferred embodiment
  • the power output by the power mechanism may be converted into the front-rear reciprocating movement of the reciprocating movement platform through other mechanisms (for example, a crank-slider mechanism or a crank-connecting rod mechanism) .
  • the side gate 7 is provided with the gate top plate 71 and the gate bottom plate 73 in the preferred embodiment, the side gate 7 may be provided without the gate top plate 71 and the gate bottom plate 73.
  • the side gate 7 is configured to be horizontally rotatable around the gate connection shaft 217 and to be fixed by using the fastening bolts or the fastening knobs in the preferred embodiment, the side gate 7 may be vertically rotatable around a horizontal shaft or take an integrally detachable form, and may be fixed by way of buckling, clamping or the like.
  • the fastening bolts or the fastening knobs which transversely pass through the support beam of the working assembly serve as the fastening structure for fixing the support beam in the preferred embodiment
  • other structures may be used to fix the working assembly.
  • the support beam of the working assembly may be fixed to a top plate of the extension 22 by bolts in a longitudinal direction the bolts.
  • the support beam 103 of the working assembly is configured to have the H-shaped section in the preferred embodiment, the support beam 103 may have other sectional shapes (for example, a “HH” shaped section) as long as the configurations which are complementary to the sectional shape of the support beam are respectively formed on the inner sides of the side gate 7 and the extension 22.
  • a “HH” shaped section for example, a “HH” shaped section
  • the side gate 7 and the extension 22 may not be provided with the wedge shaped lugs or other structures complementary to the sectional shape of the support beam.
  • the gate member may be located on the left side, an up side or a down side of the extension 22 and the structures of the extension 22 and the working assembly may be modified accordingly.
  • the gate member is provided in the preferred embodiment, the gate member may not be provided.
  • each of the working assemblies has the support beam located above the movable work executing element in the preferred embodiment, the support beam may be located under the work executing element or between two work executing elements. Further, the working assemblies may not be provided with the support beam. In this case, a structure (for example, a guide rail) for guiding and supporting the work executing element may be provided to the extension 22 and/or the gate member.
  • the circular cylinders 45 and 46 are respectively provided to the lower surface of the upper reciprocating plate 41 and to the upper surface of the lower reciprocating plate 42 in the preferred embodiment, the circular cylinder 46 may be provided to the upper surface of the upper reciprocating plate 41 and the circular cylinder 45 may be provided to the lower surface of the lower reciprocating plate 42. Similarly, the circular cylinders may be provided to both of the upper surfaces of the reciprocating plates 41 and 42 or provided to both of the lower surfaces of the reciprocating plates 41 and 42.
  • the manner in which the reciprocating movement platform is connected to the work executing element is not limited to this.
  • the cylinders are not necessarily circular and the groove is not necessarily U-shaped. Any connection manner is possible, as long as the work executing element is driven by the reciprocating movement platform to make desired movement (for example, front-rear reciprocating movement or reciprocating swinging) .
  • a groove or an opening as the connection interface may be provided on a front end of the reciprocating movement platform, and accordingly, a projection or a hook capable of being inserted into the groove or the opening may be provided on a rear end of the work executing element.
  • the electric motor is used as the power mechanism in the preferred embodiment, a gasoline motor, a diesel motor, a pneumatic motor or the like may be used as the power mechanism. Further, the electric motor may be supplied with power by an external power supply or an internal battery or an internal storage battery.
  • the transmission system may use one set of gears or three sets of gears or more gears to transmit power.
  • the transmission system may use another transmission mechanism such as a belt or a sprocket or use a combination of the gears and another transmission mechanism to transmit power to the eccentric wheel assembly 33.
  • the eccentric wheel assembly 33 is connected to the bull gear 322 through the journal 331 in the preferred embodiment, the eccentric wheel assembly 33 may be integrally formed with the bull gear 322.
  • eccentric wheel assembly 33 is an integral structure in the preferred embodiment, the upper eccentric wheel and the lower eccentric wheel in the eccentric wheel assembly 33 may be components independent from each other.
  • the eccentric wheel assembly 33 includes two eccentric wheels in the preferred embodiment, the number of the eccentric wheels in the eccentric wheel assembly is not limited to this. Three or more eccentric wheels may be provided, and just one eccentric wheel is also possible.
  • the number of the reciprocating plates in the reciprocating movement platform matches the number of the eccentric wheels.
  • the working assembly may be a reciprocating saw or a cutter assembly having one stationary blade and one movable blade.
  • front guide bar 215A and the rear guide bar 215B are bolts provided in the body 21 in the preferred embodiment, the front guide bar 215A and the rear guide bar 215B may be projecting bars integrally formed with the body 21 or the bottom plate 29.
  • each of the support-guide assemblies includes a guide bar, a bush having a large diameter portion and two small diameter portions, and two washers and cooperates with the corresponding elongated holes in the reciprocating movement platform in the preferred embodiment
  • the structure of the support-guide assemblies and the manner in which the support-guide assemblies cooperate with the reciprocating movement platform are not limited to this.
  • the bush may not have the large diameter portion, and thus the upper reciprocating plate 41 is directly supported by the upper surface of the lower reciprocating plate 42.
  • each of the support-guide assemblies may be an integral “8” shaped frame member, and the upper reciprocating plate 41 and the lower reciprocating plate 42 in the reciprocating movement platform respectively enter into upper and lower holes of the “8” shaped frame member.
  • both of the support-guide assemblies may be located on the same side (for example, the front side or the rear side) of the eccentric wheel. Further, the total number of the support-guide assemblies may be one or more than two.
  • each of the support-guide assemblies has a dual function of supporting and guiding the reciprocating movement platform in the preferred embodiment
  • one or both or all of the support-guide assemblies may include a member only having the function of supporting the reciprocating movement platform or only having the function of guiding the reciprocating movement platform.
  • the bush and the washers may not be provided, and the reciprocating movement platform is just guided by the guide bars (that is, the reciprocating movement platform is supported by other members rather than the guide bars) .
  • the bottom plate 29 is connected to the central frame via nuts in the preferred embodiment, the bottom plate 29 may be used as a part of the central frame.
  • the front handle and the rear handle included in the multifunctional tool are defined to be rotatable to accommodate the requirements for the optimum working orientation of different working assemblies.
  • the front handle and the rear handle may be made to be non-rotatable or partially rotatable.
  • at least one of the front and rear handles is made to be replaceable.
  • roller wheels may be provided in a bottom portion of the housing to perform the weeding function conveniently.
  • the housing is dispensable, and the handles may be integrated into or directly mounted to the central frame.
  • the multifunctional tool of the present utility model may have a regulation device for regulating a velocity of the power mechanism and/or a transmission ratio of the transmission system to accommodate different operation requirements.
  • the multifunctional tool of the present utility model may have a control mechanism or a control device for guaranteeing a position of the connection interface or the eccentric wheel after shut down.
  • the multifunctional tool has a stop mechanism ensuring that two connection interfaces are located at the same position in the front-rear direction after shut down. In this way, in a case of two work executing elements, the connection interfaces are connected to the two work executing elements more conveniently.
  • the multifunctional tool of the present utility model not only achieves the functions of pruning, weeding and sawing (or shearing, cutting, slicing) but also achieves other functions such as sieving, knocking and the like by replacing its working assembly with a different one.
  • multifunctional used in the present utility model also covers achievement of various refined functions by replacing the working assembly with another one of the same type having a different model number (for example, cutting for different purposes is achieved by replacing the reciprocating saw blade assembly with another one made of a different material or having a different tooth form or a different tooth pitch, branches of different types are trimmed by replacing the pruning cutter blade assembly with another one having a different model number/specification, and so on) .

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Abstract

A multifunctional tool and a core structure thereof are provided. The core structure comprises a central frame as well as a power mechanism and a transmission system mounted to the central frame. The central frame includes an extension (22) located in a front portion of the central frame as a base to fix various working assemblies. The core structure further comprises a reciprocating movement platform, the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection interface being entirely located within the extension, and the transmission system transmits power output by the power mechanism to the reciprocating movement platform so that the reciprocating movement platform makes reciprocating movement forward and backward with respect to the central frame and drives the work executing element connected to the connection interface to make desired movement. The core structure is connected to working assemblies with different functions and specifications and the operation of replacing the working assemblies is simplified and facilitated.

Description

MULTIFUNCTIONAL TOOL AND CORE STRUCTURE THEREOF
Field of the Utility Model
The present utility model relates to a multifunctional tool and a core structure thereof. The multifunctional tool can perform operations such as shearing, cutting, sawing and the like by replacing its working assembly with a different one.
Background of the Utility Model
Tools such as a pruner, a weeder and a reciprocating saw driven by a power mechanism (for example, an electric motor) have been widely employed. These tools have a common characteristic in which they have a work executing element that can perform rectilinear reciprocating movement or reciprocating swinging movement and that is in direct contact with object (s) to be processed such as branches or lawns.
Among these tools, the pruner as a main pruning tool for a shrubby green belt usually comprises a casing with a front handle and a rear handle, a core structure housed in the casing, and a pruning cutter blade assembly as a working assembly located on a front side (the side away from a user of the pruner) . Wherein, the core structure mainly includes a central frame, a power mechanism and a transmission system. Fig. 6 is a sectional view showing a core structure of a conventional pruner in the prior art and a part of a pruning cutter blade assembly cooperating with the core structure. As shown in Fig. 6, power output by the power mechanism (not shown) is converted into eccentric rotation of an upper eccentric wheel 333 and a lower eccentric wheel 334 through each of  gears  312, 313, 322 in the transmission system, and the upper eccentric wheel 333 and the lower eccentric wheel 334 are mounted to an eccentric wheel shaft 212 such that the upper eccentric wheel 333 and the lower eccentric wheel 334 are angularly offset from each other by 180 degrees. In addition, the pruning cutter blade assembly is mainly constituted by a support beam 103’as well as an upper cutter blade 101’and a lower cutter blade 102’as a work executing element. Rear ends of the upper cutter blade 101’and the lower cutter blade 102’encase (envelop) the upper eccentric  wheel 333 and the lower eccentric wheel 334 respectively. The upper cutter blade 101’and the lower cutter blade 102’are driven to make reciprocating movement forward and backward by the eccentric rotation of the upper eccentric wheel 333 and the lower eccentric wheel 334 so that branches are trimmed by a shearing effect of serrated edges (not shown) on both sides of front portions of the two blades. Further, the eccentric wheel shaft 212, a gear shaft 213 and a number of fixation shafts (not shown) can extend through respective holes opened in a bottom plate 29’and be fixed by corresponding nuts 6C or the like. Moreover, the pruning cutter blade assembly is also connected to the central frame through a bolt 108A’with a washer 109A’and a bolt 108B’with a washer 109B’.
The conventional pruner mentioned above is mainly disadvantageous in its single function such that it can only be used for pruning or shearing but can not be used for saw-cutting or weeding and the pruning cutter blade assembly thereof is not replaceable or is troublesome to be replaced. If the pruning cutter blade assembly is required to be replaced, it is at least required that the whole pruner is inverted upside down, the nuts or other connecting elements are screwed off the bottom plate 29’by a spanner, the whole bottom plate 29’is removed, the bolts 108A’, 108B’and the pruning cutter blade assembly are dismounted； then a new pruning cutter blade assembly is mounted, the bottom plate 29’, the nuts and the bolts 108A’, 108B’are remounted； finally the pruner is inverted back, and the overall procedure is time-consuming and laborsome. Furthermore, lubricating oil (grease) is usually applied into the transmission system to reduce wear and noise, and the lubricating oil (grease) is liable to be leaked onto the pruning cutter blade assembly and the bottom plate 29’. In an operation of replacing the pruning cutter blade assembly, the user’s hands are very likely to be contaminated by the lubricating oil (grease) and a rear end of the dismounted pruning cutter blade assembly is also adhered with the lubricating oil (grease) so that further cleaning is demanded. In addition, non-dismountability of the pruning cutter blade assembly also leads to problems such as excessively large packaging sizes, inconvenient handing and the like. These disadvantages of the existing pruner are also present in the existing tools such as the reciprocating saw and the weeder.
A pruner capable of replacing its cutter is disclosed in Chinese utility model publication No. 202425365U that has been granted. The pruner comprises a working module and a power module. The working module includes a transmission gearbox and a pruning cutter, and the power module is detachably connected to the transmission gearbox. When the pruning cutter is to be replaced, only the working module is required to be replaced and the whole pruner need not be replaced. However, when the pruning cutter is replaced, the transmission gearbox needs to be replaced along with the pruning cutter, and thus it is high in cost and is not practical.
Summary of the Utility Model
In view of the disadvantages in the prior art, the present utility model aims to provide a multifunctional tool and a core structure thereof, and the multifunctional tool enables easy and convenient replacement of working assemblies with different functions and specifications so as to perform operations such as shearing, cutting, sawing and the like.
In order to achieve the above object, the present utility model provides a core structure of a multifunctional tool, the core structure comprises: a central frame that includes an extension located in a front portion of the central frame； a power mechanism that is mounted to the central frame； and a transmission system that is mounted to the central frame, wherein the core structure further comprises a reciprocating movement platform, the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection interface being entirely located within the extension, and the transmission system transmits power output by the power mechanism to the reciprocating movement platform so that the reciprocating movement platform makes reciprocating movement (rectilinear reciprocating movement) forward and backward with respect to the central frame and drives the work executing element connected to the connection interface to make desired movement.
Preferably, the transmission system includes an eccentric wheel, the power output by the power mechanism is converted into rotation of the  eccentric wheel, the reciprocating movement platform encases the eccentric wheel, and the reciprocating movement platform is caused to make reciprocating movement forward and backward by the rotation of the eccentric wheel.
Preferably, a middle portion of the reciprocating movement platform encases the eccentric wheel, a front side and a rear side of the reciprocating movement platform relative to the eccentric wheel are supported and guided by support-guide assemblies fixed to the central frame respectively, and the reciprocating movement platform is supported to the central frame by the support-guide assemblies and guided to make reciprocating movement forward and backward by the support-guide assemblies.
Preferably, an elongated hole is opened in the reciprocating movement platform at a position corresponding to each of the support-guide assemblies, and each of the support-guide assemblies passes through its corresponding elongated hole.
Preferably, the eccentric wheel includes a first eccentric wheel and a second eccentric wheel which are mounted to a common eccentric wheel shaft such that the first eccentric wheel and the second eccentric wheel are angularly offset from each other by 180 degrees, the reciprocating movement platform includes an upper reciprocating plate and a lower reciprocating plate which encase the first eccentric wheel and the second eccentric wheel respectively, and thus when the first eccentric wheel and the second eccentric wheel are rotated at the same velocity under the driving of the power mechanism, the first eccentric wheel and the second eccentric wheel respectively drive the upper reciprocating plate and the lower reciprocating plate to make reciprocating movement forward and backward with an angular offset of 180 degrees.
Preferably, the connection interface on the front end of the reciprocating movement platform includes a circular cylinder which is provided to a lower surface of the upper reciprocating plate and a circular cylinder which is provided to an upper surface of the lower reciprocating plate.
Preferably, a U-shaped groove to be connected to the circular cylinders is formed in the rear end of the work executing element of the working assembly.
Preferably, the power mechanism is an electric motor, and the transmission system is a gear set which includes one or more gears.
Preferably, the central frame is fixedly connectable to a support beam of various working assemblies through a fastening structure.
Preferably, a gate member which is openable and closable is provided to the central frame at a relative front position of the central frame, and the gate member shields or exposes the connection interface.
Preferably, the gate member is positioned on a side surface of the central frame.
Preferably, configurations which are complementary to a sectional shape of a support beam of various working assemblies are formed on an inner side of the gate member and an inner side of the extension respectively.
Preferably, through holes are provided in the gate member, and the gate member is fixed to the central frame by screws passing through the through holes and screwed into the central frame when the gate member is closed, the screws being able to pass through via holes in a support beam of various working assemblies.
Correspondingly, the present utility model further provides a multifunctional tool, and the multifunctional tool comprises the core structure mentioned above and at least one of the working assemblies.
Preferably, the working assemblies include a reciprocating saw blade assembly, a weeding shearer assembly, and a pruning cutter blade assembly.
Preferably, the multifunctional tool further includes a housing and a gripping operation element, and at least a part of the core structure is disposed in the housing.
Preferably, the gripping operation element includes a front handle and/or a rear handle, wherein at least one handle is rotatable and/or replaceable to accommodate requirements for an optimum working orientation of different working assemblies.
The reciprocating movement platform which makes reciprocating movement forward and backward is used in the present utility model to be connected to the work executing element of various working assemblies so that the position of the connection interface is forwardly moved into the  extension (the front portion of the central frame) and the working assemblies with different functions and specifications can be replaced simply and conveniently.
Additionally, by respectively providing the support-guide assemblies on the front side and the rear side of the reciprocating movement platform relative to the eccentric wheel in a two-point supporting manner, working stability of the reciprocating movement platform and the working assemblies (particularly when the working load is great) is guaranteed while convenience for replacing the working assemblies is ensured.
Additionally, convenience for replacing the working assemblies is further improved by providing the gate member.
Brief Description of the Drawings
Fig. 1 is an exploded perspective view showing a part of a core structure of a multifunctional tool according to a preferred embodiment of the present utility model；
Fig. 2A is a bottom view showing the core structure of the multifunctional tool according to the preferred embodiment of the present utility model and a part of a pruning cutter blade assembly cooperating with the core structure；
Fig. 2B is a side sectional view taken along a line B-B in Fig. 2A；
Fig. 3 is an enlarged sectional view showing details of a rear support-guide assembly in the core structure shown in Figs. 2A and 2B；
Figs. 4A and 4B are perspective views showing the core structure of the multifunctional tool according to the preferred embodiment of the present utility model and a part of the pruning cutter blade assembly cooperating with the core structure, wherein Fig. 4A shows a gate member in an opened state, and Fig. 4B shows the gate member in a closed state；
Fig. 5 is a perspective view showing a reciprocating saw blade assembly, a weeding shearer assembly and the pruning cutter blade assembly capable of cooperating with the core structure of the multifunctional tool according to the preferred embodiment of the present utility model； and
Fig. 6 is an enlarged sectional view showing a core structure of a conventional pruner in the prior art and a part of a pruning cutter blade  assembly cooperating with the core structure.
Detailed Description of the Preferred Embodiments
Specific embodiments of the present utility model will be described below in connection with the drawings. In the concrete description of the embodiments, a “front-rear direction” means an extending direction (a lengthwise direction) of a working assembly (for example, a pruning cutter blade assembly) (also a lengthwise direction of a multifunctional tool) , wherein a direction in which the working assembly protrudes from the core structure is referred to as a front direction, and a direction in which the working assembly retracts to the core structure is referred to as a rear direction； a “left-right direction” means a widthwise direction of the multifunctional tool； a “up-down direction” means a height direction of the multifunctional tool. One of the front-rear direction, the left-right direction and the up-down direction is orthogonal to other two directions. Further, the identical components and configurations are indicated by the identical reference numerals.
Fig. 1 is an exploded perspective view showing a part of a core structure of a multifunctional tool according to a preferred embodiment of the present utility model. Fig. 2A is a bottom view showing the core structure and a part of a pruning cutter blade assembly cooperating with the core structure, and Fig. 2B is a side sectional view taken along a line B-B in Fig. 2A.
With reference to Figs. 1, 2A and 2B, it can be seen that the core structure in the preferred embodiment also has a central frame, a power mechanism (an electric motor in the present embodiment) and a transmission system. Wherein, the central frame is mainly constituted by a body 21 and an extension 22 (as a base to fix various working assemblies) located in front of the body 21. An electric motor bracket 211 for mounting the electric motor (not shown) and an electric motor holding structure (not shown) are provided in an upper portion of the body 21. An output toothed shaft (not shown) of the electric motor extends downward through a hole 218 in the electric motor bracket 211, and is connected to the transmission system. The transmission system includes a primary bull gear 312 and a secondary pinion gear 313 which are respectively rotatably mounted to a primary gear shaft 213 as well as a  secondary bull gear 322 and an eccentric wheel assembly 33 which are respectively rotatably mounted to an eccentric wheel shaft (also serving as a secondary gear shaft) 212. The output toothed shaft of the electric motor meshes with the primary bull gear 312 to drive the primary bull gear 312 to be rotated. The primary bull gear 312 and the secondary pinion gear 313 are fixed with each other and rotated around the primary gear shaft 213 together. The secondary pinion gear 313 meshes with the secondary bull gear 322. The secondary bull gear 322 is integrally formed with a sleeve 321. The eccentric wheel assembly 33 includes the following elements in an order from top to bottom: a journal 331 which is inserted and fixed (for example, by interference fit) into a center hole of the bull gear 322 (or a center hole of the sleeve 321) , a collar 332, as well as an upper eccentric wheel 333 and a lower eccentric wheel 334 which are angularly offset from each other by 180 degrees. The eccentric wheel assembly 33 and the bull gear 322 are rotated around the eccentric wheel shaft 212 together.
As shown in Fig. 1, the core structure in the preferred embodiment further includes a reciprocating movement platform. The reciprocating movement platform includes an upper reciprocating plate 41 and a lower reciprocating plate 42. Waist-shaped  holes  43 and 44 which extend in a transverse direction of the upper reciprocating plate 41 and the lower reciprocating plate 42 (a left-right direction of the multifunctional tool) are respectively opened in middle portions in a longitudinal direction of the upper reciprocating plate 41 and the lower reciprocating plate 42 (a front-rear direction of the multifunctional tool) . The upper reciprocating plate 41 encases (envelops) the upper eccentric wheel 333 through the waist-shaped hole 43, and the lower reciprocating plate 42 encases (envelops) the lower eccentric wheel 334 through the waist-shaped hole 44. A circular cylinder 45 which projects downward from a lower surface of a front end of the upper reciprocating plate 41 is provided to the lower surface, and a circular cylinder 46 which projects upward from an upper surface of a front end of the lower reciprocating plate 42 is provided to the upper surface. The  circular cylinders  45 and 46 act as a connection interface of the reciprocating movement platform (will be described in detail hereinafter) which is to be connected to a work executing element of  various working assemblies. The  circular cylinders  45 and 46 are entirely located within the extension 22 of the central frame. The extension 22 has a side guard plate 222 on one side (for example, the left side) thereof.
In addition, as shown in Figs. 1 and 2B, the core structure of the preferred embodiment includes a front support-guide assembly and a rear support-guide assembly for supporting and guiding the reciprocating movement platform. The front support-guide assembly includes a front guide bar 215A provided in a front portion of the body 21 as well as a bush 51A and  washers  52A, 53A cooperating with the front guide bar 215A. The rear support-guide assembly includes a rear guide bar 215B provided in a rear portion of the body 21 as well as a bush 51B and  washers  52B, 53B cooperating with the rear guide bar 215B. The front guide bar 215A and the rear guide bar 215B are bolts provided in the body 21. To cooperate with the front and rear support-guide assemblies,  elongated holes  47A, 47B which extend in the front-rear direction of the multifunctional tool are opened in the upper reciprocating plate 41 on front and rear sides of the waist-shaped hole 43 respectively, and  elongated holes  48A, 48B which extend in the front-rear direction of the multifunctional tool are opened in the lower reciprocating plate 42 on front and rear sides of the waist-shaped hole 44 correspondingly. All of the  elongated holes  47A, 47B, 48A and 48B may be waist-shaped holes. The front guide bar 215A passes through the washer 52A, the elongated hole 47A, the bush 51A, the elongated hole 48A and the washer 53A in order. The rear guide bar 215B passes through the washer 52B, the elongated hole 47B, the bush 51B, the elongated hole 48B and the washer 53B in order.
As shown in Figs. 1 and 2A, the core structure of the preferred embodiment includes a bottom plate 29 for integrally connecting the central frame, the transmission system and the reciprocating movement platform. The bottom plate 29 is located below the body 21 of the central frame and provided with holes 29A to 29E. The front guide bar 215A and the rear guide bar 215B have threads on their lower ends. The lower ends of the front guide bar 215A and the rear guide bar 215B respectively pass through the  holes  29A, 29B to mate with nuts 6A, 6B so that the front and rear support-guide assemblies are clamped and fixed between the body 21 and the bottom plate  29. Moreover, the secondary gear shaft (eccentric wheel shaft) 212, the primary gear shaft 213, and a fixation shaft 216 on the body 21 respectively pass through the  holes  29C, 29E, 29D, and may be fixed by corresponding nuts (not shown) .
Fig. 3 is an enlarged sectional view showing details of the rear support-guide assembly. As shown in Fig. 3, in the rear support-guide assembly, small diameter portions 511B and 512B are respectively formed in upper and lower portions of the bush 51B, and a large diameter portion 513B is formed in a middle portion of the bush 51B. Outer diameters of the small diameter portions 511B and 512B are equal to or slightly smaller than transverse widths of the  elongated holes  47B and 48B respectively. Heights of the small diameter portions 511B and 512B are slightly larger than thicknesses of the upper reciprocating plate 41 and the lower reciprocating plate 42. An outer diameter of the large diameter portion 513B is larger than the transverse widths of the  elongated holes  47B and 48B. A height of the large diameter portion 513B is larger than a sum of heights of the  circular cylinders  45 and 46. In this way, after the rear support-guide assembly has been assembled, movements of the upper reciprocating plate 41 and the lower reciprocating plate 42 are respectively guided by the small diameter portions 511B and 512B, and the upper reciprocating plate 41 and the lower reciprocating plate 42 are respectively supported by an upper surface 514B of the larger diameter portion 513B and the washer 53B. The front support-guide assembly may have a configuration the same as that of the rear support-guide assembly.
In addition, a gate connection shaft 217 is provided on a right side of a front end of the body 21, and a side gate 7 as an example of a gate member which is openable and closable is pivotably connected to the gate connection shaft 217 (that is, the side gate 7 can be horizontally rotated around the gate connection shaft 217) . Figs. 4A and 4B respectively show the core structure and a part of a pruning cutter blade assembly cooperating with the core structure in a state in which the gate member is opened and a state in which the gate member is closed. As shown in Figs. 1, 4A and 4B, in the preferred embodiment, the side gate 7 includes a gate top plate 71, a gate side plate 72  and a gate bottom plate 73. A wedge shaped lug 74 is provided on an inner side of the gate side plate 72. Through  holes  76A and 76B which penetrate through the gate side plate 72 and the wedge shaped lug 74 are provided in the wedge shaped lug 74. A reinforcement rib 75 may be provided on the gate bottom plate 73.
Wedge shaped lugs 223 to 225 are also provided on an inner side of the side guard plate 222 of the extension 22. Screw holes 223A and 225A are opened in the wedge shaped  lugs  223 and 225 respectively. When the side gate 7 is closed, the gate side plate 72 is opposed to the side guard plate 222, and the gate top plate 71 and the gate bottom plate 73 shield at least a part of a top portion and at least a part of a bottom portion of the extension 22 respectively.
Fig. 5 is a perspective view showing working assemblies capable of cooperating with the core structure according to the preferred embodiment. The working assemblies may include a reciprocating saw blade assembly 8 used for sawing or cutting, a weeding shearer assembly 9 used for weeding and a pruning cutter blade assembly 10 used for pruning and the like. A description will be given below with the pruning cutter blade assembly 10 as an example.
As shown in Figs. 2B, 4A and 5, the pruning cutter blade assembly 10 includes a support beam 103 as well as an upper cutter blade 101 and a lower cutter blade 102 as a movable work executing element. A U-shaped groove (opening) 104 which extends in a transverse direction of the upper cutter blade 101 (the left-right direction of the multifunctional tool) and can be connected to the circular cylinder 45 of the upper reciprocating plate 41 is provided on a rear end of the upper cutter blade 101, and a U-shaped groove (opening) 105 which extends in a transverse direction of the lower cutter blade 102 (the left-right direction of the multifunctional tool) and can be connected to the circular cylinder 46 of the lower reciprocating plate 42 is provided on a rear end of the lower cutter blade 102. Furthermore,  elongated holes  106A, 106B or the like which extend in the front-rear direction of the multifunctional tool are provided in the upper cutter blade 101, and  elongated holes  107A, 107B or the like which extend in the front-rear direction of the multifunctional tool are  provided in the lower cutter blade 102. Screw holes 109A, 109B, 109C or the like which extend the up-down direction of the multifunctional tool are correspondingly provided in the support beam 103. The upper cutter blade 101 and the lower cutter blade 102 are connected to the support beam 103 in a manner in which they are slidable with respect to one another (in the front-rear direction of the multifunctional tool) by bolts (not shown) or the like which pass through corresponding elongated holes and corresponding screw holes. Via  holes  108A and 108B which extend in the left-right direction of the multifunctional tool are provided in middle portions of side surfaces on both ends of the support beam 103. Moreover, the support beam 103 has an H-shaped cross section, and a left notch and a right notch 103A forming the H-shaped cross section have shapes that are complementary to the wedge shaped lugs 223 to 225 on the extension 22 and the wedge shaped lug 74 on the side gate 7 respectively.
In a pruning state, the upper circular cylinder 45 of the reciprocating movement platform is inserted into and engaged with the U-shaped groove 104 of the pruning cutter blade assembly 10, and the lower circular cylinder 46 of the reciprocating movement platform is inserted into and engaged with the U-shaped groove 105 of the pruning cutter blade assembly 10. Then, the side gate 7 is closed. At this time, the wedge shaped lug 74 on the side gate 7 abuts against the right notch 103A of the support beam 103, and the wedge shaped lugs 223 to 225 on the extension 22 abut against the left notch of the support beam 103. Screw stems (not shown) of fastening knobs capable of being manually screwed or fastening bolts, as an example of a fastening structure, pass through the corresponding through  holes  76A, 76B in the gate side plate 72 and the corresponding via  holes  108A, 108B in the support beam 103 from an outer side of the gate side plate 72 and are fixed into the corresponding screw holes 223A, 225A of the side guard plate 222. This configuration ensures that the support beam 103 can be stably secured to the central frame.
When the electric motor causes the upper eccentric wheel 333 and the lower eccentric wheel 334 to be rotated at the same velocity with an angular offset of 180 degrees relative to each other through gear transmission of the  transmission system, the upper eccentric wheel 333 and the lower eccentric wheel 334 drive the upper reciprocating plate 41 and the lower reciprocating plate 42 to make reciprocating movement (rectilinear reciprocating movement) forward and backward with an angular offset of 180 degrees relative to each other through the waist-shaped hole 43 of the upper reciprocating plate 41 and the waist-shaped hole 44 of the lower reciprocating plate 42 respectively. The upper reciprocating plate 41 drives the upper cutter blade 101 to make reciprocating movement forward and backward through the circular cylinder 45 and the U-shaped groove 104, and the lower reciprocating plate 42 drives the lower cutter blade 102 to make reciprocating movement forward and backward through the circular cylinder 46 and the U-shaped groove 105. A middle portion of the reciprocating movement platform (the upper reciprocating plate 41 and the lower reciprocating plate 42) encases the  eccentric wheels  333, 334, and a front side and a rear side of the reciprocating movement platform relative to the  eccentric wheels  333, 334 are supported and guided by the support-guide assemblies fixed to the central frame. As a result, such a two-point supporting manner guarantees working stability of the reciprocating movement platform and that of the working assemblies connected to the reciprocating movement platform, and a failure is unlikely to occur even if the working assemblies are subjected to a great load.
When replacement is required to be performed among different working assemblies (for example, when the kind of the branches to be trimmed is altered and it is required to change the specification of the pruning cutter blade assembly, or when the pruning function is required to be switched into a reciprocating saw function) , a user need not perform a process of inverting the tool or demounting the bottom plate. The current working assembly can be removed via the upper circular cylinder 45 and/or the lower circular cylinder 46 conveniently as long as the fastening bolts or the fastening knobs are screwed off the screw holes 223A, 225A from the outer side of the side gate 7 to open the side gate 7 and expose the upper circular cylinder 45 and the lower circular cylinder 46. Then, after the upper circular cylinder 45 and/or the lower circular cylinder 46 is engaged with the U-shaped groove (s) of a new working assembly, the side gate 7 is closed, and the fastening bolts or the fastening  knobs are screwed on, replacement of the working assemblies can be finished. Not only it is rapid and labor saving during the overall replacement procedure, but also the removed working assembly is hardly adhered with the lubricating oil (grease) since the working assembly is entirely located within the extension 22. Incidentally, when mounting the reciprocating saw blade assembly 8 of a type in which there is a single work executing element, a U-shaped groove 81 of the reciprocating saw blade assembly 8 on a rear end thereof is only required to be engaged with one of the circular cylinder 45 of the upper reciprocating plate 41 and the circular cylinder 46 of the lower reciprocating plate 42. Accordingly, in operation, the other of the upper reciprocating plate 41 and the lower reciprocating plate 42 that is not engaged with the reciprocating saw blade assembly 8 is in an idle state. Further, a U-shaped groove 91 opened in an inclined manner is formed on a rear end of the weeding shearer assembly 9. In this case, the front-rear reciprocating movement of the  circular cylinders  45 and 46 is converted into the left-right swinging of a weeding cutter blade so as to realize a transverse shearing function.
Moreover, in addition to the core structure and the working assemblies, the multifunctional tool according to the preferred embodiment further includes a housing and a gripping operation element (both are not shown) . For example, the gripping operation element is a front handle, a rear handle or the like. The front handle and the rear handle are made to be rotatable and/or replaceable to accommodate requirements for an optimum working orientation of different working assemblies. At least a part of the core structure is disposed in the housing.
Modifications
Although the preferred embodiment of the present utility model has been described in detail hereinbefore, the present utility model is not limited to this. Those skilled in the art can make various alterations and modifications to the preferred embodiment within the scope of the present utility model.
For example, although the power output by the power mechanism is converted into the rotation of the eccentric wheel and the reciprocating  movement platform is caused to make reciprocating movement forward and backward by the rotation of the eccentric wheel in the preferred embodiment, the power output by the power mechanism may be converted into the front-rear reciprocating movement of the reciprocating movement platform through other mechanisms (for example, a crank-slider mechanism or a crank-connecting rod mechanism) .
Although the side gate 7 is provided with the gate top plate 71 and the gate bottom plate 73 in the preferred embodiment, the side gate 7 may be provided without the gate top plate 71 and the gate bottom plate 73.
Although the side gate 7 is configured to be horizontally rotatable around the gate connection shaft 217 and to be fixed by using the fastening bolts or the fastening knobs in the preferred embodiment, the side gate 7 may be vertically rotatable around a horizontal shaft or take an integrally detachable form, and may be fixed by way of buckling, clamping or the like.
Although the fastening bolts or the fastening knobs which transversely pass through the support beam of the working assembly serve as the fastening structure for fixing the support beam in the preferred embodiment, other structures may be used to fix the working assembly. For example, the support beam of the working assembly may be fixed to a top plate of the extension 22 by bolts in a longitudinal direction the bolts.
Although the support beam 103 of the working assembly is configured to have the H-shaped section in the preferred embodiment, the support beam 103 may have other sectional shapes (for example, a “HH” shaped section) as long as the configurations which are complementary to the sectional shape of the support beam are respectively formed on the inner sides of the side gate 7 and the extension 22.
Although the wedge shaped lugs which are complementary to the sectional shape of the support beam are provided to the side gate 7 and the extension 22 in the preferred embodiment, the side gate 7 or the extension 22 may not be provided with the wedge shaped lugs or other structures complementary to the sectional shape of the support beam.
Although the side gate 7 on a right side of the extension 22 is used as the gate member in the preferred embodiment, the gate member may be located  on the left side, an up side or a down side of the extension 22 and the structures of the extension 22 and the working assembly may be modified accordingly.
Although the gate member is provided in the preferred embodiment, the gate member may not be provided.
Although each of the working assemblies has the support beam located above the movable work executing element in the preferred embodiment, the support beam may be located under the work executing element or between two work executing elements. Further, the working assemblies may not be provided with the support beam. In this case, a structure (for example, a guide rail) for guiding and supporting the work executing element may be provided to the extension 22 and/or the gate member.
Although the  circular cylinders  45 and 46 are respectively provided to the lower surface of the upper reciprocating plate 41 and to the upper surface of the lower reciprocating plate 42 in the preferred embodiment, the circular cylinder 46 may be provided to the upper surface of the upper reciprocating plate 41 and the circular cylinder 45 may be provided to the lower surface of the lower reciprocating plate 42. Similarly, the circular cylinders may be provided to both of the upper surfaces of the  reciprocating plates  41 and 42 or provided to both of the lower surfaces of the  reciprocating plates  41 and 42.
Although the  circular cylinders  45 and 46 function as an example of the connection interface and the work executing element has the U-shaped groove connectable to the  circular cylinders  45, 46 in the preferred embodiment, the manner in which the reciprocating movement platform is connected to the work executing element is not limited to this. The cylinders are not necessarily circular and the groove is not necessarily U-shaped. Any connection manner is possible, as long as the work executing element is driven by the reciprocating movement platform to make desired movement (for example, front-rear reciprocating movement or reciprocating swinging) . For example, a groove or an opening as the connection interface may be provided on a front end of the reciprocating movement platform, and accordingly, a projection or a hook capable of being inserted into the groove or the opening may be provided on a rear end of the work executing element.
Although the electric motor is used as the power mechanism in the preferred embodiment, a gasoline motor, a diesel motor, a pneumatic motor or the like may be used as the power mechanism. Further, the electric motor may be supplied with power by an external power supply or an internal battery or an internal storage battery.
Although two sets of gears are used in the transmission system to transmit power in the preferred embodiment, the transmission system may use one set of gears or three sets of gears or more gears to transmit power.
Although the gears are used in the transmission system to transmit power to the eccentric wheel assembly 33 in the preferred embodiment, the transmission system may use another transmission mechanism such as a belt or a sprocket or use a combination of the gears and another transmission mechanism to transmit power to the eccentric wheel assembly 33.
Although the eccentric wheel assembly 33 is connected to the bull gear 322 through the journal 331 in the preferred embodiment, the eccentric wheel assembly 33 may be integrally formed with the bull gear 322.
Although the eccentric wheel assembly 33 is an integral structure in the preferred embodiment, the upper eccentric wheel and the lower eccentric wheel in the eccentric wheel assembly 33 may be components independent from each other.
Although the eccentric wheel assembly 33 includes two eccentric wheels in the preferred embodiment, the number of the eccentric wheels in the eccentric wheel assembly is not limited to this. Three or more eccentric wheels may be provided, and just one eccentric wheel is also possible. The number of the reciprocating plates in the reciprocating movement platform matches the number of the eccentric wheels. In a case where there is only one eccentric wheel, for example, the working assembly may be a reciprocating saw or a cutter assembly having one stationary blade and one movable blade.
Although the front guide bar 215A and the rear guide bar 215B are bolts provided in the body 21 in the preferred embodiment, the front guide bar 215A and the rear guide bar 215B may be projecting bars integrally formed with the body 21 or the bottom plate 29.
Although each of the support-guide assemblies includes a guide bar, a bush having a large diameter portion and two small diameter portions, and two washers and cooperates with the corresponding elongated holes in the reciprocating movement platform in the preferred embodiment, the structure of the support-guide assemblies and the manner in which the support-guide assemblies cooperate with the reciprocating movement platform are not limited to this. For example, the bush may not have the large diameter portion, and thus the upper reciprocating plate 41 is directly supported by the upper surface of the lower reciprocating plate 42. Alternatively, each of the support-guide assemblies may be an integral “8” shaped frame member, and the upper reciprocating plate 41 and the lower reciprocating plate 42 in the reciprocating movement platform respectively enter into upper and lower holes of the “8” shaped frame member.
Although the two support-guide assemblies are respectively located on the front and rear sides of the eccentric wheel in the preferred embodiment, both of the support-guide assemblies may be located on the same side (for example, the front side or the rear side) of the eccentric wheel. Further, the total number of the support-guide assemblies may be one or more than two.
Although each of the support-guide assemblies has a dual function of supporting and guiding the reciprocating movement platform in the preferred embodiment, one or both or all of the support-guide assemblies may include a member only having the function of supporting the reciprocating movement platform or only having the function of guiding the reciprocating movement platform. For example, the bush and the washers may not be provided, and the reciprocating movement platform is just guided by the guide bars (that is, the reciprocating movement platform is supported by other members rather than the guide bars) .
Although the bottom plate 29 is connected to the central frame via nuts in the preferred embodiment, the bottom plate 29 may be used as a part of the central frame.
In the preferred embodiment, the front handle and the rear handle included in the multifunctional tool are defined to be rotatable to accommodate the requirements for the optimum working orientation of different working  assemblies. However, those skilled in the art can understand that the front handle and the rear handle may be made to be non-rotatable or partially rotatable. For example, at least one of the front and rear handles is made to be replaceable. Further, roller wheels may be provided in a bottom portion of the housing to perform the weeding function conveniently. Also, the housing is dispensable, and the handles may be integrated into or directly mounted to the central frame.
In addition, the multifunctional tool of the present utility model may have a regulation device for regulating a velocity of the power mechanism and/or a transmission ratio of the transmission system to accommodate different operation requirements.
In addition, the multifunctional tool of the present utility model may have a control mechanism or a control device for guaranteeing a position of the connection interface or the eccentric wheel after shut down. For example, the multifunctional tool has a stop mechanism ensuring that two connection interfaces are located at the same position in the front-rear direction after shut down. In this way, in a case of two work executing elements, the connection interfaces are connected to the two work executing elements more conveniently.
In addition, those skilled in the art can conceive that the multifunctional tool of the present utility model not only achieves the functions of pruning, weeding and sawing (or shearing, cutting, slicing) but also achieves other functions such as sieving, knocking and the like by replacing its working assembly with a different one. Further, the meaning of the term “multifunctional” used in the present utility model also covers achievement of various refined functions by replacing the working assembly with another one of the same type having a different model number (for example, cutting for different purposes is achieved by replacing the reciprocating saw blade assembly with another one made of a different material or having a different tooth form or a different tooth pitch, branches of different types are trimmed by replacing the pruning cutter blade assembly with another one having a different model number/specification, and so on) .
For the purpose of explanation and description, some exemplary  embodiments of the present utility model have been given hereinabove. However, the foregoing description is not intended to be exhaustive or to restrict the present utility model to precise forms disclosed herein. Obviously, those skilled in the art can make various alterations and modifications. For example, individual feature (features) can be arbitrarily combined, substituted or omitted within the spirit and scope of the present utility model. Therefore, the scope of the present utility model should be defined only by the attached claims and the equivalent contents thereof.

Claims (17)

  1. A core structure of a multifunctional tool, comprising
    a central frame that includes an extension located in a front portion of the central frame；
    a power mechanism that is mounted to the central frame； and
    a transmission system that is mounted to the central frame,
    characterized in that the core structure further comprises a reciprocating movement platform,
    the reciprocating movement platform is connectable to a rear end of a work executing element of various working assemblies through a connection interface provided on a front end of the reciprocating movement platform, the connection interface being entirely located within the extension, and
    the transmission system transmits power output by the power mechanism to the reciprocating movement platform so that the reciprocating movement platform makes reciprocating movement forward and backward with respect to the central frame and drives the work executing element connected to the connection interface to make desired movement.
  2. The core structure according to claim 1, characterized in that
    the transmission system includes an eccentric wheel, the power output by the power mechanism is converted into rotation of the eccentric wheel, and
    the reciprocating movement platform encases the eccentric wheel, and the reciprocating movement platform is caused to make reciprocating movement forward and backward by the rotation of the eccentric wheel.
  3. The core structure according to claim 2, characterized in that
    a middle portion of the reciprocating movement platform encases the eccentric wheel, a front side and a rear side of the reciprocating movement platform relative to the eccentric wheel are supported and guided by support-guide assemblies fixed to the central frame respectively, and the reciprocating movement platform is supported to the central frame by the support-guide assemblies and guided to make reciprocating movement  forward and backward by the support-guide assemblies.
  4. The core structure according to claim 3, characterized in that
    an elongated hole is opened in the reciprocating movement platform at a position corresponding to each of the support-guide assemblies, and each of the support-guide assemblies passes through its corresponding elongated hole.
  5. The core structure according to claim 2, characterized in that
    the eccentric wheel includes a first eccentric wheel and a second eccentric wheel which are mounted to a common eccentric wheel shaft such that the first eccentric wheel and the second eccentric wheel are angularly offset from each other by 180 degrees, and
    the reciprocating movement platform includes an upper reciprocating plate and a lower reciprocating plate which encase the first eccentric wheel and the second eccentric wheel respectively, and thus when the first eccentric wheel and the second eccentric wheel are rotated at the same velocity under the driving of the power mechanism, the first eccentric wheel and the second eccentric wheel respectively drive the upper reciprocating plate and the lower reciprocating plate to make reciprocating movement forward and backward with an angular offset of 180 degrees.
  6. The core structure according to claim 5, characterized in that
    the connection interface on the front end of the reciprocating movement platform includes a circular cylinder which is provided to a lower surface of the upper reciprocating plate and a circular cylinder which is provided to an upper surface of the lower reciprocating plate.
  7. The core structure according to claim 6, characterized in that
    a U-shaped groove to be connected to the circular cylinders is formed in the rear end of the work executing element of the working assembly.
  8. The core structure according to any one of claims 1 to 7, characterized  in that
    the power mechanism is an electric motor, and
    the transmission system is a gear set which includes one or more gears.
  9. The core structure according to any one of claims 1 to 7, characterized in that
    the central frame is fixedly connectable to a support beam of various working assemblies through a fastening structure.
  10. The core structure according to any one of claims 1 to 7, characterized in that
    a gate member which is openable and closable is provided to the central frame at a relative front position of the central frame, and the gate member shields or exposes the connection interface.
  11. The core structure according to claim 10, characterized in that
    the gate member is positioned on a side surface of the central frame.
  12. The core structure according to claim 11, characterized in that
    configurations which are complementary to a sectional shape of a support beam of various working assemblies are formed on an inner side of the gate member and an inner side of the extension respectively.
  13. The core structure according to claim 11, characterized in that
    through holes are provided in the gate member, and the gate member is fixed to the central frame by screws passing through the through holes and screwed into the central frame when the gate member is closed, the screws being able to pass through via holes in a support beam of various working assemblies.
  14. A multifunctional tool, characterized in that
    the multifunctional tool comprises the core structure according to any one of claims 1 to 13 and at least one of the working assemblies.
  15. The multifunctional tool according to claim 14, characterized in that
    the working assemblies include a reciprocating saw blade assembly, a weeding shearer assembly, and a pruning cutter blade assembly.
  16. The multifunctional tool according to claim 14 or 15, characterized in that
    the multifunctional tool further includes a housing and a gripping operation element, and at least a part of the core structure is disposed in the housing.
  17. The core structure according to claim 16, characterized in that
    the gripping operation element includes a front handle and/or a rear handle, wherein at least one handle is rotatable and/or replaceable.
PCT/CN2016/084705 2016-04-29 2016-06-03 Multifunctional tool and core structure thereof WO2017185478A1 (en)

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CN204482446U (en) * 2015-01-22 2015-07-22 杭州鲁茨科技有限公司 A kind of cassette mechanism structure and the shrub and hedge trimmer with described cassette mechanism structure of shrub and hedge trimmer

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JPH0928150A (en) * 1995-07-21 1997-02-04 Nikkari Co Ltd Structure for installing and removing reciprocating type cutting blade device
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JP2021023187A (en) * 2019-08-02 2021-02-22 株式会社やまびこ Reciprocating cutting blade device and handheld work machine
JP7253471B2 (en) 2019-08-02 2023-04-06 株式会社やまびこ Reciprocating cutting blade device and hand-held work machine

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