WO2002070201A1 - Safety guard for angle grinders - Google Patents

Safety guard for angle grinders Download PDF

Info

Publication number
WO2002070201A1
WO2002070201A1 PCT/BG2001/000003 BG0100003W WO02070201A1 WO 2002070201 A1 WO2002070201 A1 WO 2002070201A1 BG 0100003 W BG0100003 W BG 0100003W WO 02070201 A1 WO02070201 A1 WO 02070201A1
Authority
WO
WIPO (PCT)
Prior art keywords
shaped
fork
guard
cam lever
nut
Prior art date
Application number
PCT/BG2001/000003
Other languages
French (fr)
Inventor
Nikolay Ivanov Ganchev
Dimitar Netov Dimitrov
Original Assignee
Sparky Eltos
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 Sparky Eltos filed Critical Sparky Eltos
Priority to PCT/BG2001/000003 priority Critical patent/WO2002070201A1/en
Publication of WO2002070201A1 publication Critical patent/WO2002070201A1/en

Links

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
    • B24B23/00—Portable grinding machines, e.g. hand-guided; Accessories therefor
    • B24B23/02—Portable grinding machines, e.g. hand-guided; Accessories therefor with rotating grinding tools; Accessories therefor
    • B24B23/028—Angle tools

Definitions

  • the preferred embodiment relates to a safety guard for angle grinders, especially portable angle grinders used in machine engineering, building and as household tools.
  • a safety guard for an angle grinder whose construction is described in DE 36 38 337 C 2, is known.
  • the construction comprises a circular guard member with a flange at the far edge.
  • a joint ring with a locking tooth projecting from its inner side is attached centrally to the circular guard member.
  • the two ends of said joint ring are parallel toe-shaped with holes in them.
  • a tension adjusting bolt whose unthreaded end is eye-shaped.
  • Riveted to it is a fork-shaped cam lever, which has a U-shaped section. Between the fork-shaped lever and said joint ring toe there is a sheave.
  • An adjusting nut is located on said tension adjusting bolt.
  • angle grinder guard is its complicated construction comprising a tension adjusting bolt with a complicated configuration and elongated non-standard nut.
  • Another disadvantage is that in closed position the end of said fork-shaped lever is far from said joint ring. Sometimes, during operation, this prevents the utilization of the cutting or grinding disk.
  • the object of the preferred embodiment is to make an angle grinder guard, which has a simpler construction and allows for optimal use of cutting or grinding disks in operation.
  • the guard of the angle grinder includes a circular guard member with a flange at the far edge.
  • a joint split ring is attached centrally to the circular guard member.
  • the two ends of said joint ring are parallel left and right toe-shaped and have coaxial holes.
  • a shaped nut is screwed on an adjusting bolt.
  • On the carrier axes on the two sides of said nut there is a fork-shaped cam lever in a bearing. Between said lever and the right hand of said joint ring end there is a locking plate. At the hinged end of said fork-shaped cam lever, a cam surface has been shaped.
  • Fig. 1 is a general view of the guard for angle grinders.
  • Fig. 2 is a view of the profiled nut 7 of Fig. 1.
  • Fig. 3 is a view of the fork-shaped cam lever 11 of Fig. 1.
  • Fig. 4 is a view of the locking plate 10 of Fig. 1.
  • the guard of the angle grinder includes a circular guard member 1 with a flange (not shown) at the far edge.
  • a joint split ring 2 is attached centrally to the circular guard member 1.
  • the two ends of said joint ring are parallel left 3 and right 4 toe-shaped and have coaxial openings 5.
  • a shaped nut 7 is screwed on an adjusting bolt 6.
  • On the carrier axes 8 on the two sides of said nut there is a fork-shaped cam lever 9 in a bearing. Between said lever 9 and the right hand end 4 of said joint ring there is a locking plate 10. At the hinged end of said fork-shaped cam lever 9, a cam surface 11 has been shaped.
  • the guard for angle grinders is used in the following way.
  • the fork-shaped cam lever 9 is so turned that it gets farther from joint split ring 2. Because of resilient forces, the diameter of the ring increases and the guard can easily be put and turned in the required position on the attachment flange that is made on the head of the angle grinder. Then by turning fork-shaped cam lever 9 backwards into locked position the guard is tightened due to cam surface 11. If necessary, the tightening force can be increased by tightening adjusting bolt 6.
  • the cut flat sector 13 on cam surface 11 prevents said guard for angle grinders from unlocking.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Grinding-Machine Dressing And Accessory Apparatuses (AREA)
  • Finish Polishing, Edge Sharpening, And Grinding By Specific Grinding Devices (AREA)

Abstract

The guard for an angle grinder is designed mainly for portable power tools used in machine engineering, building and as household tools.The safety guard of the angle grinder includes a circular guard member 1 with a flange at the far edge. A joint split ring (2) is attached centrally to the circular.(5) guard member 1. The two ends of said joint ring are parallel left (3) and right (4) toe-shaped and have coaxial openings (5). In the coaxial openings, a shaped nut (7) is screwed on an adjusting bolt (6). On the carrier axes (8) on the two sides of said nut, there is a fork-shaped cam lever (9) in a bearing. Between said lever (9) and the lower end (4) of said joint ring there is a locking plate (10). At the hinged end of said fork-(6) shaped cam lever (9), a cam surface 11 has been shaped. There is a cut flat sector (13) in the middle section of said cam surface between the right joint end 4 and carrier hinge (12) in closed position of fork-shaped cam lever (9). The flat sector is in contact with said locking plate (10). On the plate there is a retaining tooth 14 whose plane is parallel with the axis of said adjusting bolt (6) and is in contact with the outline of (7) shaped nut (7). A limiting tooth (16) is located perpendicularly to the plane of said retaining tooth (14) and is bent in the opposite direction.

Description

SAFETY GUARD FOR ANGLE GRINDERS
SCOPE OF APPLICATION
The preferred embodiment relates to a safety guard for angle grinders, especially portable angle grinders used in machine engineering, building and as household tools.
BACKGROUND OF THE INVENTION
A safety guard for an angle grinder, whose construction is described in DE 36 38 337 C 2, is known. The construction comprises a circular guard member with a flange at the far edge. A joint ring with a locking tooth projecting from its inner side is attached centrally to the circular guard member. The two ends of said joint ring are parallel toe-shaped with holes in them. In said holes there is a tension adjusting bolt whose unthreaded end is eye-shaped. Riveted to it is a fork-shaped cam lever, which has a U-shaped section. Between the fork-shaped lever and said joint ring toe there is a sheave. An adjusting nut is located on said tension adjusting bolt.
One disadvantage of that angle grinder guard is its complicated construction comprising a tension adjusting bolt with a complicated configuration and elongated non-standard nut. Another disadvantage is that in closed position the end of said fork-shaped lever is far from said joint ring. Sometimes, during operation, this prevents the utilization of the cutting or grinding disk.
The object of the preferred embodiment is to make an angle grinder guard, which has a simpler construction and allows for optimal use of cutting or grinding disks in operation. DESCRIPTION OF INVENTION
The guard of the angle grinder includes a circular guard member with a flange at the far edge. A joint split ring is attached centrally to the circular guard member. The two ends of said joint ring are parallel left and right toe-shaped and have coaxial holes. According to the invention, in the coaxial holes a shaped nut is screwed on an adjusting bolt. On the carrier axes on the two sides of said nut, there is a fork-shaped cam lever in a bearing. Between said lever and the right hand of said joint ring end there is a locking plate. At the hinged end of said fork-shaped cam lever, a cam surface has been shaped. There is a cut flat sector in the middle section of said cam surface between the right joint end and carrier hinge in closed position of fork-shaped cam lever. The flat sector is in contact with said locking plate. On the plate there is a retaining tooth whose plane is parallel with the axis of said adjusting bolt and is in contact with the outline of shaped nut. A limiting tooth is located perpendicularly to the plane of said retaining tooth and is bent in the opposite direction.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a general view of the guard for angle grinders. Fig. 2 is a view of the profiled nut 7 of Fig. 1. Fig. 3 is a view of the fork-shaped cam lever 11 of Fig. 1. Fig. 4 is a view of the locking plate 10 of Fig. 1.
DESCRIPTION OF PREFERRED EMBODIMENT OF THE INVENTION
As is shown in the figures, the guard of the angle grinder includes a circular guard member 1 with a flange (not shown) at the far edge. A joint split ring 2 is attached centrally to the circular guard member 1. The two ends of said joint ring are parallel left 3 and right 4 toe-shaped and have coaxial openings 5. In the coaxial openings, a shaped nut 7 is screwed on an adjusting bolt 6. On the carrier axes 8 on the two sides of said nut, there is a fork-shaped cam lever 9 in a bearing. Between said lever 9 and the right hand end 4 of said joint ring there is a locking plate 10. At the hinged end of said fork-shaped cam lever 9, a cam surface 11 has been shaped. There is a cut flat sector 13 in the middle section of said cam surface between the right joint end 4 and carrier hinge 12 in closed position of fork-shaped cam lever 9. The flat sector is in contact with said locking plate 10. On the plate there is a retaining tooth 14 whose plane is parallel with the axis of said adjusting bolt 6 and is in contact with the outline of shaped nut 7. A limiting tooth 16 is located perpendicularly to the plane of said retaining tooth 14 and is bent in the opposite direction.
APPLICATION
The guard for angle grinders is used in the following way. The fork-shaped cam lever 9 is so turned that it gets farther from joint split ring 2. Because of resilient forces, the diameter of the ring increases and the guard can easily be put and turned in the required position on the attachment flange that is made on the head of the angle grinder. Then by turning fork-shaped cam lever 9 backwards into locked position the guard is tightened due to cam surface 11. If necessary, the tightening force can be increased by tightening adjusting bolt 6. The cut flat sector 13 on cam surface 11 prevents said guard for angle grinders from unlocking.

Claims

1. A guard for an angle grinder comprising: a circular guard member with a flange at the edge; a joint split ring is attached centrally to the circular guard member. The two ends of said joint ring are parallel left and right toe-shaped and have coaxial openings 5; an adjusting bolt 6 which is located in said coaxial openings 5; a shaped nut 7 which is screwed on said adjusting bolt 6; a fork-shaped cam lever 9 which rests in a bearing round the carrier axes 8 of said nut 7; a locking plate 10 which is located between said fork-shaped cam lever 9 and right hand end 4 of joint ring.
2. A guard for an angle grinder under claim 1 comprising: a cam surface 11 located at the hinged end of fork-shaped cam lever 9; a cut flat sector 13 located in the middle section of said cam surface 11 between the hinged end of fork-shaped cam lever 9 and right hand end 4 of joint ring in closed position of fork-shaped cam lever 9; a locking plate 10 which is in contact with said cut flat sector 13.
3. A guard for an angle grinder under claim 1 comprising: a retaining tooth 14 located on said locking plate 10 and whose plane is parallel with the axis of said adjusting bolt 6 and is in contact with the outline of said profiled nut 7; a limiting tooth 16 located perpendicularly to the plane of said retaining tooth 14 and bent in the opposite direction.
PCT/BG2001/000003 2001-03-07 2001-03-07 Safety guard for angle grinders WO2002070201A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/BG2001/000003 WO2002070201A1 (en) 2001-03-07 2001-03-07 Safety guard for angle grinders

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BG2001/000003 WO2002070201A1 (en) 2001-03-07 2001-03-07 Safety guard for angle grinders

Publications (1)

Publication Number Publication Date
WO2002070201A1 true WO2002070201A1 (en) 2002-09-12

Family

ID=3897301

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BG2001/000003 WO2002070201A1 (en) 2001-03-07 2001-03-07 Safety guard for angle grinders

Country Status (1)

Country Link
WO (1) WO2002070201A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058910A1 (en) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Portable power tool system
JP2009023006A (en) * 2007-07-17 2009-02-05 Hitachi Koki Co Ltd Foil guard
JP2009125841A (en) * 2007-11-21 2009-06-11 Hitachi Koki Co Ltd Electric tool
CN103170911A (en) * 2011-12-23 2013-06-26 罗伯特·博世有限公司 Device for preventing the rotation of protection caps
CN102107386B (en) * 2009-12-28 2014-01-01 泉峰(中国)贸易有限公司 Sanding machine
CN108500796A (en) * 2018-04-27 2018-09-07 湖州南浔创星机械有限公司 A kind of spare parts processing machinery sander

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857640A (en) * 1956-05-10 1958-10-28 Newaygo Engineering Company Foundry flask
DE8628602U1 (en) * 1986-10-27 1986-12-04 Robert Bosch Gmbh, 7000 Stuttgart Protective cover for hand-held machine tools, especially grinding machines
DE3638337A1 (en) * 1986-11-10 1988-05-19 Licentia Gmbh Clamping device for the protective hood of angle grinders or similar power tools
US5073100A (en) * 1990-05-18 1991-12-17 Outboard Marine Corporation Clamp assembly

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2857640A (en) * 1956-05-10 1958-10-28 Newaygo Engineering Company Foundry flask
DE8628602U1 (en) * 1986-10-27 1986-12-04 Robert Bosch Gmbh, 7000 Stuttgart Protective cover for hand-held machine tools, especially grinding machines
DE3638337A1 (en) * 1986-11-10 1988-05-19 Licentia Gmbh Clamping device for the protective hood of angle grinders or similar power tools
US5073100A (en) * 1990-05-18 1991-12-17 Outboard Marine Corporation Clamp assembly

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2008058910A1 (en) * 2006-11-13 2008-05-22 Robert Bosch Gmbh Portable power tool system
US8221197B2 (en) 2006-11-13 2012-07-17 Robert Bosch Gmbh Hand-held power tool system
JP2009023006A (en) * 2007-07-17 2009-02-05 Hitachi Koki Co Ltd Foil guard
JP2009125841A (en) * 2007-11-21 2009-06-11 Hitachi Koki Co Ltd Electric tool
CN102107386B (en) * 2009-12-28 2014-01-01 泉峰(中国)贸易有限公司 Sanding machine
CN103170911A (en) * 2011-12-23 2013-06-26 罗伯特·博世有限公司 Device for preventing the rotation of protection caps
CN108500796A (en) * 2018-04-27 2018-09-07 湖州南浔创星机械有限公司 A kind of spare parts processing machinery sander

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