GB2622031A - Pressure protection device for mechanical power tools - Google Patents

Pressure protection device for mechanical power tools Download PDF

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Publication number
GB2622031A
GB2622031A GB2212595.9A GB202212595A GB2622031A GB 2622031 A GB2622031 A GB 2622031A GB 202212595 A GB202212595 A GB 202212595A GB 2622031 A GB2622031 A GB 2622031A
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GB
United Kingdom
Prior art keywords
linkage
mechanical arm
drive unit
contact switch
electric drive
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
GB2212595.9A
Other versions
GB202212595D0 (en
Inventor
Sang Chan Kin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sun Win Engineering Ltd
Original Assignee
Sun Win Engineering 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 Sun Win Engineering Ltd filed Critical Sun Win Engineering Ltd
Priority to GB2212595.9A priority Critical patent/GB2622031A/en
Publication of GB202212595D0 publication Critical patent/GB202212595D0/en
Publication of GB2622031A publication Critical patent/GB2622031A/en
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D59/00—Accessories specially designed for sawing machines or sawing devices
    • B23D59/001—Measuring or control devices, e.g. for automatic control of work feed pressure on band saw blade
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D45/00—Sawing machines or sawing devices with circular saw blades or with friction saw discs
    • B23D45/04—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever
    • B23D45/042—Sawing machines or sawing devices with circular saw blades or with friction saw discs with a circular saw blade or the stock carried by a pivoted lever with the saw blade carried by a pivoted lever
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23D—PLANING; SLOTTING; SHEARING; BROACHING; SAWING; FILING; SCRAPING; LIKE OPERATIONS FOR WORKING METAL BY REMOVING MATERIAL, NOT OTHERWISE PROVIDED FOR
    • B23D47/00—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts
    • B23D47/08—Sawing machines or sawing devices working with circular saw blades, characterised only by constructional features of particular parts of devices for bringing the circular saw blade to the workpiece or removing same therefrom
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23Q—DETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q11/00—Accessories fitted to machine tools for keeping tools or parts of the machine in good working condition or for cooling work; Safety devices specially combined with or arranged in, or specially adapted for use in connection with, machine tools
    • B23Q11/06—Safety devices for circular cutters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27G—ACCESSORY MACHINES OR APPARATUS FOR WORKING WOOD OR SIMILAR MATERIALS; TOOLS FOR WORKING WOOD OR SIMILAR MATERIALS; SAFETY DEVICES FOR WOOD WORKING MACHINES OR TOOLS
    • B27G19/00—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws
    • B27G19/02—Safety guards or devices specially adapted for wood saws; Auxiliary devices facilitating proper operation of wood saws for circular saws
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16P—SAFETY DEVICES IN GENERAL; SAFETY DEVICES FOR PRESSES
    • F16P3/00—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body
    • F16P3/12—Safety devices acting in conjunction with the control or operation of a machine; Control arrangements requiring the simultaneous use of two or more parts of the body with means, e.g. feelers, which in case of the presence of a body part of a person in or near the danger zone influence the control or operation of the machine

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Sawing (AREA)
  • Auxiliary Devices For Machine Tools (AREA)
  • Portable Nailing Machines And Staplers (AREA)

Abstract

A pressure protection device 38 comprises a mechanical arm 20 with an elbow end for fixing the mechanical arm onto a workbench 40 and a hand end for installing a mechanical power tool 22. A contact switch 10 is installed on the arm and controls an electric drive unit 18 to start when the contact switch is on and stop when the switch is off. A linkage 14 is movable relative to the arm and installed on the arm at one end, and an elastic element 16 is configured between the linkage and mechanical arm to form an elastic force between both. The drive unit engages with the linkage, generating driving force pressing the linkage moving toward the mechanical arm, the driving force generated by the unit is transmitted onto the arm through the linkage and elastic element, pushing the tool towards an object 36. When the tool works above a maximum pressure, the linkage contacts the switch to turn off the unit, and when it returns to a normal pressure, there is no contact and the switch turns the unit on.

Description

Pressure Protection Device for Mechanical Power Tools
BACKGROUND 01 THE INVENTION
[0001] The present invention relates to the technical field of protective device for mechanical power tools. More particularly, the present invention is in the technical field of pressure protective device for protecting mechanical power tools from being damaged under over high pressure.
[0002] The mechanical power tools in the prior art, such as cutting machine, can be controlled and protected by hydraulic protection device for the cutting works. However, the structure of the protection device for the mechanical power tools in the prior art is complicated. Due to the complication of structure of the protection device in the prior art, they are difficult to install and operate, and the maintenance costs for the protective device are high. The protection device in the prior art may also cause malfuction of the mechanical power tools, or even damage the mechanical power tools.
[0003] In view of the above technical issues in the prior art, the present invention provides a pressure protection device for protecting mechanical power tools, in aiming to avoid the complicated structure of protection device and lower the manufacture costs of the pressure protection device in the prior art.
SUMMARY OF THE INVENTION
[0004] According to the present invention, the pressure protection device utilized a contact switch and elastic elements such as spring, rubber band, and compressed air cylinder. Since the contact switch and elastic components are light, simple, environmentally friendly, and easily available on the market, which can solve the problems of complicated structure, heavy weight, and high manufacturing costs of pressure protection devices in the prior art. Pressure protection device of the present invention has broader field of application, for example, it can be used for protecting a variety of mechanical power tools.
[0005] The pressure protection device according to the present invention mainly comprises a contact switch, a mechanical arm, a linkage, an elastic element, and an electric drive unit. The mechanical power tools can be installed at the end of the mechanical arm. The electric drive unit can drive and operate the mechanical power tools through the linkage and said elastic element. While the mechanical power tools are in operation mode, the pressure protection device will suspend or resume said electric drive unit when the pressure applied to the mechanical power tools by the electric drive unit is over high or over low, to achieve the function of protecting the mechanical power tools.
[0006] In some embodiments according to the present invention, a rear end of said linkage is pivotally connected to said mechanical arm near an elbow end of the said mechanical arm. A front end of said linkage is engaged with the mechanical arm near a hand end of the said mechanical arm through an elastic element. The mechanical power tools can be installed at the hand end of the mechanical arm.
[0007] In some embodiments according to the present invention, the pressure protection device further comprising a supporting arm, the lower part of said supporting arm being provided on said mechanical arm, the top end of said supporting arm being connected to the upper end of the elastic element, the lower end of the elastic element being connected to the front end of the linkage.
[0008] In some further embodiments according to the present invention, the output end of said electric drive unit is connected to the middle of said linkage. Said contact switch is installed on the mechanical arm and is facing towards the said linkage.
[0009] In some embodiments, the output of said electric drive unit is connected to the front end of said linkage. Said contact switch is provided on mechanical arm and is facing towards the said linkage.
[0010] In some embodiments, said linkage and the mechanical arm are configured to form a set of linear sliders and sliding rail, said linkage being able to slide linearly relative to mechanical arm along the sliding rail of the mechanical arm.
[0011] In some embodiments, said elastic element is one of a spring, a rubber band or a compressed air cylinder.
[0012] As compared with the pressure protective devices in the prior art, the beneficial effect of this invention is that the mechanical power tools in the operation will not operate under over high or over low pressure, owning to the fact that the electric drive unit is constantly suspended and resumed, so as to protect the mechanical power tools. The pressure protective device can not only ensure that the mechanical power tools always operate in the normal operation condition, but also avoid the mechanical power tools operating under over high pressure, leading to the beneficial effect of reducing damage or malfunction of the mechanical power tools.
BRIEF DESCRiPilON OF DRAWINGS
[0013] The accompanying drawings illustrate various embodiments substantially by way of examples rather than limitations, and are used in conjunction with the specification and the claims to illustrate the disclosed embodiments. Whenever appropriate, the same legend is used in all of the accompanying drawings to refer to the same or similar parts. Such examples are illustrative and are not intended to be exhaustive or exclusive of the device.
[0014] In the drawings: FIG. 1 shows a schematic diagram of the structure of the pressure protection device of the first embodiment according to the present invention, FIG. 2 shows a schematic diagram of the structure of the pressure protection device of the second embodiment according to the present invention.
FIG. 3 shows the structure of the pressure protection device of the third embodiment according to the present invention,
UST OF DRAWING REFERENCES
Contact switch 12 Supporting arm 14 Linkage 16 Elastic element 18 Electric drive unit Mechanical arm 22 Mechanical power tools 36 Cutting object 38 Pressure protection device Workbench
DETAILED DESCRIPTION OF THE INVENTION
[0015] In order to enable those skilled in the art to better understand the pressure protective device according to the present invention, the technical configuration and specific implementation will be described in details with combination of the drawings. It should be noted that detailed description of the embodiment does not serve as any limitation to the scope of protection of the invention.
[0016] The terms in the description, including but not limited to the technical terms or scientific terms, have the same meaning as those understood by a person of ordinary skill in the field of the present invention. The techniques, methods and apparatus well known to those of ordinary skill in the prior art may not be discussed in details, but where appropriate, said techniques, methods and apparatus shall be deemed as part of the specification.
[0017] In order to keep the following description of the embodiments of this disclosure clear and concise, the disclosure omits detailed descriptions of known functions and known components in the prior art.
[0018] The following embodiments of the present disclosure relate to a pressure protection device that can be used for protecting mechanical power tools, said mechanical power tools can be various mechanical power tools such as cutting devices, electric drills, etc. The said mechanical power tools is not part of the present invention. The following examples will be described in details through a number of embodiments according to the constructions and operation of the pressure protection device of the present invention.
Embodiment 1 (Supporting arm type) [0019] The first embodiment according to the present invention provides a pressure protection device 38 that can be used for protecting mechanical power tools. As shown in FIG. 1, the pressure protective device 38 includes a contact switch 10, a supporting arm 12, a linkage 14, an elastic element 16, an electric drive unit 18 and a mechanical arm 20.
[0020] Referring to FIG. 1, the contact switch 10 is installed on the mechanical arm 20 at the middle position of the mechanical arm 20. The contact switch 10 is electrically connected with the electric drive unit 18 by cord or cable, for controlling the electric drive unit 18 to start, stop and/or resume. The contact switch 10 is facing towards the linkage 14 that is being able to pivotally move up and down around a rear end of linkage 14. When the linkage 14 moving up and down under the driving force of electric drive unit 18, the linkage 14 can get contact with or disengage from the contact switch 10. When the linkage 14 got contact with the contact switch 10, the contact switch 10 can stop the operation of the electric drive unit 18 via the cord / cable connection. When the linkage 14 is disengaged from the contact switch 10, the contact switch 10 will resume the operation of the electric drive unit 18.
[0021] The supporting arm 12 is installed on the mechanical arm 20 by various means, for example welding, nuts and bolts, or thread. The supporting arm 12 has a top end that is connected with an upper end of the elastic element 16. A lower end of the elastic element 16 is connected with the linkage 14 at the front end of the linkage 14. In such configuration, the elastic element 16 is suspended between the top end of the supporting arm 12 and the front end of the linkage 14.
[0022] In the first embodiment, the elastic element 16 is a spring. However, different type of element can be used as the elastic element 16, such as spring, rubber band, and compress air cylinder, as long as that the elastic effect can be formed between the linkage 14 and the top end of the supporting arm 12.
[0023] In the first embodiment, the linkage 14 can be a lever or rod, as long as that the linkage 14 and the mechanical arm 20 can be driven by the electric drive unit 18 together through the elastic element 16. The rear end of the linkage 14 is pivotally connected with the mechanical arm 20 at a position near the elbow end of the mechanical arm 20. The output end of the electric drive unit 18 is connected in the middle of the linkage 14. Under the driving force of the electric drive unit 18, the electric drive unit 18 can simultaneously drive both the linkage 14 and the elastic element 16 to move downward.
[0024] An elbow end of the mechanical arm 20 is pivotally mounted on the workbench 40. The other end of the mechanical arm 20, namely the hand end, will be used for mounting the mechanical power tools 22. Since the electric drive unit 18 is connected to the mechanical arm 20 through the linkage 14, the elastic element 16 and supporting arm 12, the driving force generated by the electric drive unit 18 will drive the mechanical power tools 22 moving downward to cut the cutting object 36.
[0025] The pressure protection device 38 is convenient to use. For example, the mechanical power tools 22 is installed on the hand end of the mechanical arm 20 of the pressure protection device 38. Fixing the cutting object 36 below the mechanical power tools 22, then start the mechanical power tools 22. Then turn on the contact switch 10 to activate the pressure protection device 38. After the pressure protection device 38 is activated, the output of the electric drive unit 18 will generate the driving force, to push the linkage 14 moving downward. The front end of the linkage 14 pulls the elastic element 16 downward. Ultimately this downward driving force is applied to the mechanical arm 20 via the supporting arm 12, therefore, the driving force will drive and push the mechanical power tools 22 to move towards the cutting object 36 and start the cutting operation.
[0026] In the process of cutting operation, the mechanical power tools 22 will encounter the resistance from the cutting object 36. If there is no pressure protection device 38, under the continuous driving force from the electric drive unit 18, the mechanical power tools will continuously cut the cutting object 36. The mechanical power tools 22 may be damaged due to excessive resistance generated by the cutting object 36. With the pressure protection device 38, when the mechanical power tools 22 encounters over high resistance force from the cutting object 36, the linkage 14 of the pressure protection device 38 will get contact with the contact switch 10. When the linkage 14 is in contact with the contact switch 10, the contact switch will stop and suspend the electric drive unit 18 via the cable or cord automatically. When the electric drive unit 18 is stopped, the electric drive unit 18 stops to generate and produce the downward driving force. Without the downward driving force from the electric drive unit 18, the mechanical power tools 22 continues to cut only under the residual pressure force generated by the elastic element 16. Thus the pressure protection device 38 of the present invention is able to prevent the mechanical power tools 22 from being operated under conditions of excessive pressure, so to avoid potential damage to the mechanical power tools 22.
[0027] With the remaining elasticity of the elastic element 16, the mechanical power tools 22 will continue with the cutting operation. When the elasticity of the elastic element gradually decreases, the elastic element 16 will pull the linkage upwards to disengage the linkage 14 from the contact switch 10. When the linkage 14 is separated from the contact switch 10, the contact switch 10 will be switched on instantly, and then resumes the electric drive unit 18 automatically. When the electric drive unit 18 is resumed, the output end of the electric drive unit 18 will generate and produce a downward pressing force again. The downward pressing force from the electric drive unit 18 is transferred to re-apply on the mechanical arm 20 through the linkage 14, the elastic element 16, and the supporting arm 12.
[0028] The pressure protection device 38 according to the present invention controls the electric drive unit 18 to switch between the operation status and the suspension status, by means of the elastic element 16, linkage 14 and contact switch 10, thus providing protection for mechanical power tools 22, in order to prevent the mechanical power tools 22 from being damaged under excessive pressure.
[0029] Different type of electric drive unit can be used in the pressure protection device of the present invention, for example, the oscillating type drive unit or linear type drive unit.
[0030] As an example, the mechanical power tools according to the first embodiment is a cutting tool, such as saw or cutter. Actually, the pressure protection device of the present invention can be used for protection of different types of mechanical power tools, for instance, the electric drill, grinder, flattening machine, motorized saws.
Embodiment 2 (Basic configuration) [0031] The second embodiment according to the present invention provides a pressure protection device 38 that can be used for protecting mechanical power tools 22. As shown in FIG. 2, the pressure protective device 38 includes a contact switch 10, a linkage 14, an elastic element 16, an electric drive unit 18 and a mechanical arm 20.
[0032] Referring to FIG. 2, the contact switch 10 is installed on the mechanical arm 20 at a middle portion of the mechanical arm 20. The contact switch 10 is electrically connected with the electric drive unit 18 by cord or cable, for controlling the electric drive unit 18 to start, stop and/or resume. The contact switch 10 is facing towards the linkage 14 that is being able to pivotally move up and down around a rear end of linkage 14. When the linkage 14 moving up and down under the driving force of electric drive unit 18, the linkage 14 can get contact with or disengage from the contact switch 10. When the linkage 14 got contact with the contact switch 10, the contact switch 10 can stop the operation of the electric drive unit 18 via the cord or cable connection. When the linkage 14 is disengaged from the contact switch 10, the contact switch 10 will resume the operation of the electric drive unit 18 automatically.
[0033] A lower end of the elastic element 16 is installed on the mechanical arm 20, and an upper end of the elastic element 16 is connected to the front end of the linkage 14. The rear end of the linkage 14 is pivotally configured at an elbow end of the mechanical arm 20. The linkage 14 can be moved upward and downward relative to the mechanical arm 20 around the rear end of the linkage 14. The front end of the linkage 14 is connected with the upper end of the elastic element 16.
[0034] The elastic element 16 in the second embodiment is located between the mechanical arm 20 and the linkage 14, and can establish resilience force which pushes the front end of the linkage 14 away from the mechanical arm 20. In the second embodiment, the elastic element 16 is a spring. However, different type of element can be used as the elastic element 16, such as spring, rubber band, and compress air cylinder, as long as that the resilient effect can be established between the linkage 14 and the mechanical arm 20.
[0035] In the second embodiment, the linkage 14 can be a lever or rod, as long as that the linkage 14 and the mechanical arm 20 can be driven by the electric drive unit 18 together through the elastic element 16. The output end of the electric drive unit 18 is engaged with the linkage 14 at a position in the middle of the linkage 14. With the driving force generated from the electric drive unit 18, the electric drive unit 18 can simultaneously drive both the linkage 14 and the elastic element 16 to move downward.
[0036] An elbow end of the mechanical arm 20 is pivotally mounted on the workbench 40. The other end of the mechanical arm 20, namely the hand end, will be used for mounting the mechanical power tools 22. Since the electric drive unit 18 is engaged with the mechanical arm 20 through the linkage 14 and the elastic element 16, the driving force generated by the electric drive unit 18 will drive the mechanical power tools 22 moving downward to cut the cutting object 36.
[0037] To configure and use the pressure protection device 38 of the second embodiment, the mechanical power tools 22 is installed on the hand end of the mechanical arm 20 of the pressure protection device 38. The operator fixes the cutting object 36 below the mechanical power tools 22, then start the mechanical power tools 22. After the mechanical power tools 22 is started, the operator then turns on the contact switch 10 to activate the pressure protection device 38. After the pressure protection device 38 is activated, the output of the electric drive unit 18 will generate the driving force, to push the linkage 14 moving downward. The front end of the linkage 14 pushes the elastic element 16 downward. Ultimately, this type of downward driving force is applied to the mechanical arm 20 via the elastic element 16, therefore, the driving force will drive and push the mechanical power tools 22 to move towards the cutting object 36 and start the cutting operation.
[0038] In the process of cutting operation, the mechanical power tools 22 will encounter the resistance caused by the cutting object 36. If there is no pressure protection device 38, under the continuous driving force from the electric drive unit 18, the mechanical power tools 22 will continuously cut the cutting object 36. The mechanical power tools 22 may be damaged due to excessive resistance generated by the cutting object 36. With the pressure protection device 38, if the mechanical power tools 22 encounters over high resistance force from the cutting object 36, the linkage 14 of the pressure protection device 38 will get contact with the contact switch 10. When the linkage 14 is in contact with the contact switch 10, the contact switch 10 will be turn off and then stop the electric drive unit 18 via the cable or cord automatically. When the electric drive unit 18 stopped, the electric drive unit 18 stops to generate and produce a downward driving force. With the downward driving force being stopped from the electric drive unit 18, the mechanical power tools 22 continues to cut only under the residual pressure remained by the elastic element 16. Thus the pressure protection device 38 of the present invention is able to protect the mechanical power tools 22 from being operated under conditions of excessive pressure, so to avoid potential damage to the mechanical power tools 22.
[0039] With the remaining resilience force of the elastic element 16, the mechanical power tools 22 will continue with the cutting operation. When the elasticity of the elastic element gradually decreases, the elastic element 16 will pull the linkage 14 upwards to disengage the linkage 14 from the contact switch 10. When the linkage 14 is separated from the contact switch 10, the contact switch 10 will be turn on again, and then controls the electric drive unit 18 to resume the output of driving force automatically. When the electric drive unit 18 is resumed, the output end of the electric drive unit 18 will again produce a downward pressing force. The downward pressing force from the electric drive unit 18 is transferred to re-apply on the mechanical arm 20 through the linkage 14 and the elastic element 16.
[0040] The pressure protection device 38 according to the present invention controls the operation and suspension states of the electric drive unit 18, by configuration of the elastic element 16, linkage 14 and contact switch 10, thus providing protection for the mechanical power tools 22, in order to prevent the mechanical power tools 22 from being damaged under excessive pressure.
[0041] Different type of electric drive unit 18 can be used in the pressure protection device of the present invention, for example, the oscillating type drive unit or linear type drive unit.
[0042] As an example, the mechanical power tools according to the first embodiment is a cutting tool, such as saw or cutter. Actually, the pressure protection device of the present invention can be used for protecting different types of mechanical power tools, for instance, the electric drill, grinder, flattening machine, motorized saws.
Embodiment 3 (Slider type) [0043] The third embodiment according to the present invention provides a pressure protection device 38 that can be used for protecting mechanical power tools 22. As shown in FIG. 3, the pressure protective device 38 includes a contact switch 10, a linkage 14, an elastic element 16, an electric drive unit 18 and a mechanical arm 20.
[0044] Referring to FIG. 3, the contact switch 10 is installed on the mechanical arm 20 at the elbow end of the mechanical arm 20. The contact switch 10 is electrically connected with the electric drive unit 18 by cord or cable, for controlling the electric drive unit 18 to start, stop and/or resume. The contact switch 10 is facing towards the linkage 14 that is being able to linearly move up and down relative to the mechanical arm 20. When the linkage 14 is moving up and down under the driving force of electric drive unit 18, the linkage 14 can get contact with or disengage from the contact switch 10. When the linkage 14 got contact with the contact switch 10, the contact switch 10 will be turn off and stop the operation of the electric drive unit 18 via the cord or cable connection automatically. When the linkage 14 is disengaged from the contact switch 10, the contact switch 10 will be turn on again and instantly resume the operation of the electric drive unit 18.
[0045] The linkage 14 in the third embodiment is configured as a slider, which is able to slide upward and downward along a sliding rail on the mechanical arm 20. The linkage 14 comprises three parts, namely the slider part, the middle part and the end part. The slider part is actually a slider which can be sliding upward and downward relative to the mechanical arm 20 along a sliding rail of the mechanical arm 20. The middle part of the linkage 14 is in horizontal position for engaging with the output end of the electric drive unit 18. The middle part of the linkage 14 is also used for fixing the upper end of the elastic element 16. The end part of the linkage 14 is facing toward the contact switch 10 at the elbow end of the mechanical arm 20.
[0046] The elastic element 16 is located between the linkage 14 and the mechanical arm 20. To be specific the upper end of the elastic element 16 is fixed at the middle part of the linkage 14, and the lower end of the elastic element 16 is fixed on the top of a middle part of the mechanical arm 20. The elastic element 16 will form the resilience effect which pushes the linkage 14 and mechanical arm 20 apart. In such configuration, the elastic element 16 is compressed between the middle part of the linkage 14 and the mechanical arm 20.
[0047] The mechanical arm 20 also comprises three parts, namely hand end, middle part and elbow end. The hand end of the mechanical arm 20 is in horizontal position, and used for installation of the mechanical power tools 22. The elbow end of the mechanical arm 20 is also in horizontal position, and is used for fixing the mechanical arm 20 on the workbench 40. The middle part of the mechanical arm 20 is in vertical configuration, and has a sliding rail for accommodating the slider part. Therefore, the slider part is able to slide upward and downward along the sliding rail of the mechanical arm 20. Various type of configuration of the slider and the sliding rail can be adapted according to the third embodiment, such as wheel type, roller type, steel ball type etc. [0048] Similar to the first and second embodiments, in the third embodiment, the elastic element 16 is a spring. However, different type of materials can be used as the elastic element 16, such as spring, rubber band, and compress air cylinder, as long as that the pushing force can be formed between the linkage 14 and the mechanical arm 20, and push them apart from each other.
[0049] Due to the slider part of linkage 14 being able to slide along the sliding rail of the mechanical arm 20, the linkage 14 and the mechanical arm 20 can be driven together by the electric drive unit 18 through the elastic element 16. The output end of the electric drive unit 18 is engaged with the linkage 14 at the middle part of the linkage 14. Under the driving force of the electric drive unit 18, the electric drive unit 18 can simultaneously drive both the linkage 14 and the elastic element 16 to move downward.
[0050] The elbow end of the mechanical arm 20 is pivotally mounted on the workbench 40. The other end of the mechanical arm 20, namely the hand end, will be used for mounting the mechanical power tools 22. Since the electric drive unit 18 is connected to the mechanical arm 20 through the linkage 14 and the elastic element 16, the driving force generated by the electric drive unit 18 will be transmitted onto the mechanical power tools and drive the mechanical power tools 22 moving downward to cut the cutting object 36.
[0051] To configure and use the pressure protection device 38 of the third embodiment, first of all, the operator installs the mechanical power tools 22 on the hand end of the mechanical arm 20 of the pressure protection device 38. Then the operator fixes the cutting object 36 below the mechanical power tools 22, starts the mechanical power tools 22. After the mechanical power tools 22 is started, the operator then turns on the contact switch 10 to activate the pressure protection device 38. After the pressure protection device 38 is activated, the output of the electric drive unit 18 will generate the driving force, to push the linkage 14 moving downward. Under the pushing force, the electric drive unit 18 will push the middle part the linkage 14, which further pushes the elastic element 16 downward. Ultimately, this downward driving force is applied to the mechanical arm 20 via the elastic element 16, therefore, the driving force will drive and push the mechanical power tools 22 to move towards the cutting object 36 and start the cutting operation.
[0052] During the process of cutting operation, the mechanical power tools 22 will encounter the resistance caused by the cutting object 36. If there is no pressure protection device 38, under the continuous driving force from the electric drive unit 18, the mechanical power tools 22 will continuously cut the cutting object 36. The mechanical power tools 22 may be damaged due to excessive resistance generated by the cutting object 36. With the pressure protection device 38, if the mechanical power tools 22 encounters over high resistance force from the cutting object 36, the linkage 14 of the pressure protection device 38 will get contact with the contact switch 10. When the linkage 14 is in contact with the contact switch 10, the contact switch 10 will be turn off and then the electric drive unit 18 will be stopped via the cable or cord at the same time. When the electric drive unit 18 stopped, the electric drive unit 18 stops to generate and produce a downward driving force. With the downward driving force being stopped, the mechanical power tools 22 continues to cut only under the residual elastic force remained by the elastic element 16. Thus the pressure protection device 38 of the present invention is able to protect the mechanical power tools 22 from being operated under conditions of excessive pressure, so to avoid potential damage to the mechanical power tools 22.
[0053] With the remaining elastic force of the elastic element 16, the mechanical power tools 22 will continue with the cutting operation. When the elasticity of the elastic element 16 gradually decreases, the elastic element 16 will push the linkage upwards to disengage the linkage 14 from the contact switch 10. When the linkage 14 is separated from the contact switch 10, the contact switch 10 will be turn on automatically, and then controls the electric drive unit 18 to resume the output of driving force at the same time. When the electric drive unit 18 is resumed, the output end of the electric drive unit 18 will again produce a downward pressing force. The downward pressing force from the electric drive unit 18 is transmitted to re-apply on the mechanical arm 20 through the linkage 14 and the elastic element 16.
[0054] The pressure protection device 38 according to the present invention controls the operation and suspension states of the electric drive unit 18, by configuration of the elastic element 16, linkage 14 and contact switch 10, thus providing protection for mechanical power tools 22, so to prevent the mechanical power tools 22 from being damaged under excessive pressure.
[0055] Different type of electric drive unit 18 can be used in the pressure protection device 38 of the present invention, for example, the oscillating type drive unit or linear type drive unit.
[0056] As an example, the mechanical power tools according to the third embodiment is a cutting tool, such as saw or cutter. Actually, the pressure protection device of the present invention can be used for protection of different types of mechanical power tools, for instance, the electric drill, grinder, flattening machine, motorized saws.
[0057] In summary, the present invention provides a pressure protection device 38 comprising an electric drive unit 18, a contact switch 10, and an elastic element 16. The elastic element can be selected from the spring, rubber band, compressed air cylinder and the other like elements. Such type of elastic element are easily available on the market, and have the characteristics of light weight, simple structure, environmental friendly, and easy to install. The simplicity of the pressure protection device 38 of the present invention solves the problems with the pressure protection device in the prior art, such as complicated structures, difficulty of installation, high costs of manufacture and maintenance.
[0058] The above descriptions disclosed particular embodiments of this invention.
However, the structure and function as claimed in the following claims can be performed in different ways other than those in the embodiments but still being able to achieve the equivalent effects. In addition, although the exemplary embodiments have been described herein, the scope of protection according to the present invention includes any and all embodiments with equivalent elements, modifications, omissions, combinations, adaptations, or changes based on the disclosures.
[0059] The above embodiments are only for exemplary purposes and not intended to limit the scope of protection of this invention. The elements of the claims will be construed broadly based on the language used in the claims and are not limited to the examples described in this specification. Having stated that, the specification and the exemplary embodiments are intended to be interpreted as examples only, the actual scope of the present invention is limited by the following claims and the equivalents.

Claims (8)

  1. CLAIMS1. A pressure protection device for protecting mechanical power tools, the device comprising, a mechanical arm having an elbow end for fixing the mechanical arm onto a workbench, and a hand end for installing the mechanical power tools; a contact switch being able to be switched on or off, the contact switch being installed on the mechanical arm, for controlling an electric drive unit to start when the contact switch is on, and to stop the electric drive unit when the contact switch is off; a linkage being movable relative to the mechanical arm, the linkage is being installed on the mechanical arm at one end of the mechanical arm; an elastic element being configured between the linkage and the mechanical arm, forming elastic force between the linkage and the mechanical arm; the electric drive unit having a output end that is engaged with the linkage, so to generate driving force to press the linkage moving toward the mechanical arm; wherein the driving force generated by the electric drive unit can be transmitted onto the mechanical arm through the linkage and the elastic element, therefore to push the mechanical power tools moving toward to a cutting object for the cutting operation; characterized in that, when the mechanical power tools being working under over high pressure, the linkage can engage with the contact switch and turn the contact switch off, so as to stop the electric drive unit from generating the driving force; and when the mechanical power tools return to be working under normal pressure condition, the linkage can disengage from the contact switch and turn the contact switch on, so as to resume the electric drive unit for generating the driving force.
  2. 2. The pressure protection device according to claim 1, further comprising a supporting arm, the supporting arm being installed on the mechanical arm, a top end of the supporting arm being connected to the upper end of the elastic element; a lower end of the elastic element being connected to the linkage, so as to form elastic force between the supporting arm and the linkage; wherein the driving force generated by the electric drive unit can be transmitted onto the mechanical arm through the linkage, the elastic element and the supporting arm, therefore to push the mechanical power tools moving toward to a cutting object for the cutting operation; characterized in that, when the mechanical power tools being working under over high pressure, the linkage can engage with the contact switch and turn the contact switch off, so as to stop the electric drive unit from generating further driving force; and when the mechanical power tools returns to be working under normal pressure condition, the linkage can disengage from the contact switch and turn the contact switch on, so as to resume the electric drive unit for generating the driving force.
  3. 3. The pressure protection device according to claim 1, wherein the linkage further comprising a slider part and the mechanical arm further comprising a sliding rail; the sliding rail being located in a middle part of the mechanical arm and being in vertical configuration, and the sliding rail is for accommodating the slider part of the linkage; the slider part being able to slide upward and downward relative to the mechanical arm along the sliding rail; an upper end of the elastic element being is fixed at a middle part of the linkage, and a lower end of the elastic element being fixed on the top of the middle part of the mechanical arm, so as to form elastic force between the linkage and the mechanical arm; wherein the driving force generated by the electric drive unit can be transmitted onto the mechanical arm through the linkage and the elastic element, therefore to push the mechanical power tools moving toward to a cutting object for the cutting operation; characterized in that, when the mechanical power tools being working under over high pressure, the linkage can engage with the contact switch and turn the contact switch off, so as to stop the electric drive unit from generating further driving force; and when the mechanical power tools returns to be working under normal pressure condition, the linkage can disengage from the contact switch and turn the contact switch on, so as to resume the electric drive unit to generate the driving force.
  4. 4. The pressure protection device according to claim 1, wherein the elastic element is selected from one of spring, rubber band, or compressed air cylinder.
  5. The pressure protection device according to claim 1, wherein the elastic force generated by the elastic element is pushing force which can push the linkage away from the mechanical arm.
  6. 6. The pressure protection device according to claim 2, wherein the elastic force generated by the elastic element is pulling force which can pull the linkage and the supporting arm toward each other.
  7. 7. The pressure protection device according to claim 3, wherein the elastic force generated by the elastic element is pushing force which can push the linkage away from the mechanical arm.
  8. 8. The pressure protection device according to claim 3, wherein the type of slider and the sliding rail can be selected from wheel type, roller type or steel ball type.
GB2212595.9A 2022-08-31 2022-08-31 Pressure protection device for mechanical power tools Pending GB2622031A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB2212595.9A GB2622031A (en) 2022-08-31 2022-08-31 Pressure protection device for mechanical power tools

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Application Number Priority Date Filing Date Title
GB2212595.9A GB2622031A (en) 2022-08-31 2022-08-31 Pressure protection device for mechanical power tools

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GB202212595D0 GB202212595D0 (en) 2022-10-12
GB2622031A true GB2622031A (en) 2024-03-06

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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4376356A (en) * 1980-02-15 1983-03-15 Everett Charles T Cut-off saws
CN207534968U (en) * 2017-07-19 2018-06-26 佛山市广师自动化科技有限公司 A kind of gardens timber cutter device with damping collection slag

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4376356A (en) * 1980-02-15 1983-03-15 Everett Charles T Cut-off saws
CN207534968U (en) * 2017-07-19 2018-06-26 佛山市广师自动化科技有限公司 A kind of gardens timber cutter device with damping collection slag

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