EP4279215A1 - Schleifmaschine und ihre schutzbaugruppe - Google Patents

Schleifmaschine und ihre schutzbaugruppe Download PDF

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Publication number
EP4279215A1
EP4279215A1 EP23173664.6A EP23173664A EP4279215A1 EP 4279215 A1 EP4279215 A1 EP 4279215A1 EP 23173664 A EP23173664 A EP 23173664A EP 4279215 A1 EP4279215 A1 EP 4279215A1
Authority
EP
European Patent Office
Prior art keywords
section
machine body
protective cover
contact surface
locking
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
EP23173664.6A
Other languages
German (de)
English (en)
French (fr)
Inventor
Lan-Fen Chiang
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.)
Bendel Werkzeuge & Co KG GmbH
Original Assignee
Bendel Werkzeuge & Co KG GmbH
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 Bendel Werkzeuge & Co KG GmbH filed Critical Bendel Werkzeuge & Co KG GmbH
Publication of EP4279215A1 publication Critical patent/EP4279215A1/de
Pending legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/052—Protective covers for the grinding wheel specially designed for portable grinding machines with rotating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24B—MACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B55/00—Safety devices for grinding or polishing machines; Accessories fitted to grinding or polishing machines for keeping tools or parts of the machine in good working condition
    • B24B55/04—Protective covers for the grinding wheel
    • B24B55/05—Protective covers for the grinding wheel specially designed for portable grinding machines
    • B24B55/055—Protective covers for the grinding wheel specially designed for portable grinding machines with oscillating tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
    • B25F—COMBINATION OR MULTI-PURPOSE TOOLS NOT OTHERWISE PROVIDED FOR; DETAILS OR COMPONENTS OF PORTABLE POWER-DRIVEN TOOLS NOT PARTICULARLY RELATED TO THE OPERATIONS PERFORMED AND NOT OTHERWISE PROVIDED FOR
    • B25F5/00—Details or components of portable power-driven tools not particularly related to the operations performed and not otherwise provided for
    • B25F5/02—Construction of casings, bodies or handles

Definitions

  • the present utility model relates to a grinder and its protective assembly, in particular to a grinder with an adjustable protective cover and its protective assembly.
  • a workpiece is ground using a grinding wheel.
  • the grinding wheel is provided with a protective cover.
  • the protective cover In order to adjust the grinding angle of the grinding wheel, the protective cover is usually designed to be angle-adjustable.
  • the prior art requires the user to use a tool (e.g. a screwdriver) to unlock the protective cover before the angle of the protective cover can be further adjusted until the protective cover is in the correct position and then locked there. Therefore, there is a need to structurally improve the known protective covers.
  • the task of the present utility model is to offer a grinding machine and its protective assembly where the position of a protective cover can be easily adjusted.
  • An embodiment of the present utility model discloses a grinder including a machine body, a protective cover, a mounting assembly and a switching member.
  • the fastening assembly includes a locking element and a connecting element.
  • the protective cover is located at least partially between the machine body and the locking element.
  • the connecting element is attached to the locking element.
  • the switching element includes a pivoting section and an actuating section.
  • the pivoting section is located on the side of the machine body facing away from the protective cover and is pivotally mounted on the connecting element.
  • the pivoting section has an outer peripheral surface which has a first contact surface and a second contact surface.
  • the first contact surface has a first distance from the central axis of the pivoting section.
  • the second contact surface has a second distance from the central axis of the pivoting section.
  • the first distance is greater than the second distance.
  • the actuating section is connected to the pivoting section and serves to pivot the pivoting section relative to the connecting element.
  • the switching element can be rotated relative to the machine body into a locking position or a release position.
  • the first contact surface is in contact with the machine body, so that the protective cover is secured by the locking element and is caught in the machine body.
  • the second contact surface is in contact with the machine body, the protective cover being released from its clamped state by the latching element and the machine body, so that the protective cover can be rotated relative to the machine body.
  • the protection assembly includes a protection cover, a mounting assembly and a switching element.
  • the fastening assembly includes a locking element and a connecting element.
  • the protective cover is located at least partially between the machine body and the locking element.
  • the connecting element is attached to the locking element.
  • the switching element includes a pivoting section and an actuating section.
  • the pivoting section is located on the side of the machine body facing away from the protective cover and is pivotally mounted on the connecting element.
  • the pivoting section has an outer peripheral surface which has a first contact surface and a second contact surface. The first contact surface has a first distance from the central axis of the pivoting section.
  • the second contact surface has a second distance from the central axis of the pivoting section.
  • the first distance is greater than the second distance.
  • the actuating section is connected to the pivoting section and is used to pivot the Pivoting section relative to the connecting element.
  • the switching element can be rotated relative to the machine body into a locking position or a release position.
  • the first contact surface is in contact with the machine body, so that the protective cover is clamped by the locking element and the machine body.
  • the second contact surface In the release position of the switching element, the second contact surface is in contact with the machine body, the protective cover being released from its clamped state by the latching element and the machine body, so that the protective cover can be rotated relative to the machine body.
  • the switching element is pivotally arranged eccentrically on the fastening assembly, so that by directly actuating the switching element either the protective cover can be clamped or locked or the clamping can be released to adjust the position of the protective cover without a additional tools must be used. In this way, the ease of use is increased.
  • FIG. 1 a three-dimensional partial view of a grinding machine according to an exemplary embodiment of the present utility model
  • Fig. 2 a partial exploded view of the grinding machine Fig. 1
  • Fig. 3 a partial cut through the grinder Fig. 1 with a switching element in a locking position.
  • the grinding machine 10 comprises a machine body 1, a protective cover 2, a fastening assembly 3 and a switching element 4.
  • the machine body 1 includes a handle section 12, a hood section 11 and a drive element 13.
  • the hood section 11 is attached to the handle section 12.
  • the hood section 11 has a first surface 111, a second surface 112 and a receiving groove 113.
  • the second surface 112 faces away from the first surface 111.
  • the receiving groove 113 is located on the first surface 111 and has a groove bottom 1131, which is arranged on the side of the receiving groove 113 facing away from the second surface 112.
  • the hood section 11 has two bores 114.
  • the bores 114 are located in the receiving groove 113 and run through the receiving groove 113 located on the first surface 111 and the second surface 112.
  • the drive element 13 is provided with a grinding wheel 5 which is pivotable on the Drive element 13 is mounted.
  • the protective cover 2 is located on the side of the second surface 112 facing away from the first surface 111 and is rotatable relative to the machine body 1 about the axis of the drive element 13.
  • the protective cover 2 includes an upper cover section 21, a lower cover section 22 and a side cover section 23.
  • the upper cover section 21 has an arcuate sliding groove 211.
  • the lower cover section 22 is located on the side of the upper cover section 21 facing away from the hood.
  • the side cover section 23 is connected to the upper cover section 21 and the lower cover section 22 on both sides.
  • the fastening assembly 3 includes a locking element 31 Connecting element 32 and two spring elements 33.
  • the latching element 31 comprises a latching plate 311 and two hollow cylinders 312.
  • the latching plate 311 is arranged on the side of the protective cover 2 facing away from the hood section 11, so that the protective cover 2 is at least partially between the hood section 11 and the latching plate 311 is located.
  • the hollow cylinder 312 protrudes from the locking plate 311 and extends in the direction of the hood section 11.
  • the connecting element 32 comprises a first pin 321 and two second pins 322.
  • the second pin 322 is located in the bore 114 and has both ends in the first pin 321 and the hollow cylinder 312 inserted.
  • the spring element 33 is pushed onto the second pin 322.
  • the spring element 33 rests with its opposite ends on the hood section 11 and the hollow cylinder 312.
  • the switching element 4 comprises a pivoting section 41 and an actuating section 42.
  • the pivoting section 41 is located in the receiving groove 113 and is pivotally connected to the first pin 321.
  • the pivoting section 41 has an outer peripheral surface facing away from the central axis R1 of the first pin, which has a first contact surface 411 and a second contact surface 412.
  • the first contact surface 411 has a first distance D1 from the central axis R1 of the first pin.
  • the second contact surface 412 has a second distance D2 from the central axis R1 of the first pin.
  • the first distance D1 is greater than the second distance D2.
  • Pivoting section 41 is pivotally arranged eccentrically on the first pin 321, so that the distance between the central axis R1 of the first pin and the groove bottom 1131 changes with the pivoting of the pivoting section 41.
  • the actuating section 42 is connected to the pivoting section 41 and serves to pivot the pivoting section 41 relative to the first pin 321.
  • the actuation section 42 comprises a first section 421, two second sections 422 and two third sections 423.
  • the first section 421 is connected to the pivot section 41 and extends in the direction from the hood section 11 to the handle section 12.
  • the two second sections 422 are connected to two opposite sides of the first section 421 and extend in the direction of the protective cover 2.
  • the two third sections 423 are each connected to the side of the two second sections 422 facing away from the first section 421.
  • a first reference plane E1 is defined, the normal of which runs parallel to the central axis R2 of the second pin and which runs tangentially to the side of the handle section 12 facing away from the protective cover 2.
  • a second reference plane E2 is defined, the normal of which runs parallel to the central axis R2 of the second pin and which runs tangentially to the side of the handle section 12 facing the protective cover 2.
  • the third section 423 is located between the first reference plane El and the second reference plane E2 and extends towards the outer peripheral surface of the Handle section 12 away from the central axis.
  • the two arrangements, each consisting of a second section 422 and a third section 423, are arranged symmetrically to the first section 421.
  • the third portion 423 extends toward the outer peripheral surface of the handle portion 12 away from the central axis, allowing easy operation of the switching member 4 by the user.
  • FIG. 4 a schematic partial view to show how the grinding machine works Fig. 1 with the switching element in a release position and Fig. 5 a partial cut through the grinder Fig. 1 with the switching element in the release position.
  • the switching element 4 can be rotated relative to the machine body 1 in the F1 direction into a locking position or relative to the machine body 1 in the F3 direction into a release position.
  • the switching element 4 When the switching element 4 is in the locking position, the first contact surface 411 is in contact with the hood section 11, so that the central axis R1 of the first pin is arranged at the first distance D1 from the groove bottom 1131.
  • the connecting element 32 then moves the locking plate 311 in the F2 direction close to the machine body 1 so that the locking plate 311 and the machine body 1 protective cover 2 can become trapped.
  • the spring element 33 is compressed.
  • the second contact surface 412 is in contact with the machine body 1, so that the central axis R1 of the first pin is arranged at the second distance D2 from the groove bottom 1131.
  • the connecting element 32 then moves the locking plate 311 away from the machine body 1 in the F5 direction and releases the protective cover 2 from its clamped state by the locking plate 311 and the machine body 1, so that the protective cover 2 is closed relative to the machine body 1 in the F4 direction or in a closed state F4 can be rotated in the opposite direction.
  • the spring element 33 is released from its compressed state.
  • the switching element 4 Since the switching element 4 is pivotally arranged eccentrically on the connecting element 32, the distance between the central axis R1 of the first pin and the receiving groove 113 changes when the switching element 4 moves between the locking and release positions.
  • the connecting member 32 By changing the distance between the center axis R1 of the first pin and the groove bottom 1131, the connecting member 32 is moved up and down, which in turn drives the locking plate 311 and the machine body 1 to clamp the protective cover 2 or release the clamping force.
  • the protective cover 2 can be adjusted without using additional tools in that the protective cover 2 can be switched between a locked and a movable state by operating the switching element 4.
  • the position of the Protective cover 2 can be adjusted to the grinding angle of the grinding wheel 5, so that the user can work at different grinding angles while being protected by the protective cover 2.
  • the actuation section 42 can be prevented from being pushed out of its locking position by an external object during operation.
  • the hood section 11 has a receiving groove 113.
  • the hood section can also be a flat surface without a receiving groove.
  • the pivoting section can also be arranged on a surface without a groove. It is sufficient if it is located on the side of the machine body facing away from the protective cover and is connected to the machine body.
  • the handle section and the hood section can also be formed in one piece with one another or otherwise connected to one another, for example by gluing, locking, but not limited to this.
  • the arcuate sliding groove 211 is located in the lower cover section 22.
  • the arcuate sliding groove can be arranged not in the lower cover section, but in the side cover section or in the upper cover section.
  • a slide rail can be provided instead of a sliding groove structure, but this should not be viewed as limiting.
  • the bore 114 is located in the receiving groove 113.
  • the bore can not be arranged in the receiving groove, but rather, for example, on the first surface, but this should not be viewed as limiting.
  • the locking element 31 comprises a locking plate 311, two hollow cylinders 312 and two spring elements 33.
  • the locking element may not include a hollow cylinder.
  • the locking element may not include a spring element.
  • the locking plate 311 and the hollow cylinders 312 are formed in one piece with one another.
  • the locking plate and the hollow cylinders can be connected to one another in other ways, for example by gluing, locking, but not limited to this.
  • the spring element is located 33 on the hollow cylinder 312.
  • the spring element and the hollow cylinder can be connected to one another in another way, for example by gluing, but not limited to this.
  • the second pin 322 is inserted into the first pin 321.
  • the first pin and the second pin may be connected together in other ways, such as, but not limited to, in one piece, glued.
  • the third section 423 extends in the direction of the outer peripheral surface of the handle section 12 away from the central axis. In other embodiments, the third section may also extend in other directions, for example in the direction of the housing, but this should not be viewed as limiting.
  • the number of bores 114, hollow cylinders 312, second pins 322, spring elements 33, second sections 422 and third sections 423 is two, but is not limited to this. In other embodiments, the number of holes, hollow cylinders, second pins, spring elements, second sections and third sections may be changed to one or more than three.
  • the switching member is pivotally arranged eccentrically on the fastening assembly, so that by directly actuating the switching member either the protective cover can be clamped or the clamping force for adjusting the position of the protective cover can be released without a additional tools must be used. This increases the comfort of use and allows easy adjustment of the position of the protective cover.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Treatment Of Semiconductor (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)
EP23173664.6A 2022-05-18 2023-05-16 Schleifmaschine und ihre schutzbaugruppe Pending EP4279215A1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
TW111205114U TWM633645U (zh) 2022-05-18 2022-05-18 砂輪機及其保護組件

Publications (1)

Publication Number Publication Date
EP4279215A1 true EP4279215A1 (de) 2023-11-22

Family

ID=85784137

Family Applications (1)

Application Number Title Priority Date Filing Date
EP23173664.6A Pending EP4279215A1 (de) 2022-05-18 2023-05-16 Schleifmaschine und ihre schutzbaugruppe

Country Status (2)

Country Link
EP (1) EP4279215A1 (zh)
TW (1) TWM633645U (zh)

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322626A2 (de) * 1987-12-24 1989-07-05 C. & E. FEIN GmbH & Co. Handschleifmaschine mit verstellbarer Schutzhaube
EP1608488A1 (en) * 2003-03-31 2005-12-28 Atlas Copco Tools Ab Power grinder with safety guard and spindle arresting means
US20180236634A1 (en) * 2017-02-23 2018-08-23 Tranmax Machinery Co., Ltd. Safety cover for sand grinder
DE202019100921U1 (de) * 2018-02-21 2019-02-25 Makita Corporation Elektrisch angetriebenes Werkzeug
WO2020012746A1 (ja) * 2018-07-09 2020-01-16 株式会社マキタ 電動工具
CN215825059U (zh) * 2021-09-27 2022-02-15 江苏明文工具科技有限公司 一种可快速调节防护罩角度的角磨机

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0322626A2 (de) * 1987-12-24 1989-07-05 C. & E. FEIN GmbH & Co. Handschleifmaschine mit verstellbarer Schutzhaube
EP1608488A1 (en) * 2003-03-31 2005-12-28 Atlas Copco Tools Ab Power grinder with safety guard and spindle arresting means
US20180236634A1 (en) * 2017-02-23 2018-08-23 Tranmax Machinery Co., Ltd. Safety cover for sand grinder
DE202019100921U1 (de) * 2018-02-21 2019-02-25 Makita Corporation Elektrisch angetriebenes Werkzeug
WO2020012746A1 (ja) * 2018-07-09 2020-01-16 株式会社マキタ 電動工具
CN215825059U (zh) * 2021-09-27 2022-02-15 江苏明文工具科技有限公司 一种可快速调节防护罩角度的角磨机

Also Published As

Publication number Publication date
TWM633645U (zh) 2022-11-01

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