EP2420388A1 - Kreidelinienvorrichtung mit einer Vorrichtung zum Verhindern von Schnurbruch - Google Patents

Kreidelinienvorrichtung mit einer Vorrichtung zum Verhindern von Schnurbruch Download PDF

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Publication number
EP2420388A1
EP2420388A1 EP10173271A EP10173271A EP2420388A1 EP 2420388 A1 EP2420388 A1 EP 2420388A1 EP 10173271 A EP10173271 A EP 10173271A EP 10173271 A EP10173271 A EP 10173271A EP 2420388 A1 EP2420388 A1 EP 2420388A1
Authority
EP
European Patent Office
Prior art keywords
drive shaft
chalk line
gears
spool
protrusion
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.)
Granted
Application number
EP10173271A
Other languages
English (en)
French (fr)
Other versions
EP2420388B1 (de
Inventor
Göran Andersson
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.)
Hultafors Group AB
Original Assignee
Hultafors AB
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 Hultafors AB filed Critical Hultafors AB
Priority to EP20100173271 priority Critical patent/EP2420388B1/de
Publication of EP2420388A1 publication Critical patent/EP2420388A1/de
Application granted granted Critical
Publication of EP2420388B1 publication Critical patent/EP2420388B1/de
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B44—DECORATIVE ARTS
    • B44D—PAINTING OR ARTISTIC DRAWING, NOT OTHERWISE PROVIDED FOR; PRESERVING PAINTINGS; SURFACE TREATMENT TO OBTAIN SPECIAL ARTISTIC SURFACE EFFECTS OR FINISHES
    • B44D3/00—Accessories or implements for use in connection with painting or artistic drawing, not otherwise provided for; Methods or devices for colour determination, selection, or synthesis, e.g. use of colour tables
    • B44D3/38—Cord line chalkers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/40—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material mobile or transportable
    • B65H75/406—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material mobile or transportable hand-held during use
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/44—Constructional details
    • B65H75/4418—Arrangements for stopping winding or unwinding; Arrangements for releasing the stop means
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H75/00—Storing webs, tapes, or filamentary material, e.g. on reels
    • B65H75/02—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks
    • B65H75/34—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables
    • B65H75/38—Cores, formers, supports, or holders for coiled, wound, or folded material, e.g. reels, spindles, bobbins, cop tubes, cans, mandrels or chucks specially adapted or mounted for storing and repeatedly paying-out and re-storing lengths of material provided for particular purposes, e.g. anchored hoses, power cables involving the use of a core or former internal to, and supporting, a stored package of material
    • B65H75/44—Constructional details
    • B65H75/4481—Arrangements or adaptations for driving the reel or the material
    • B65H75/4492—Manual drives
    • B65H75/4494—Arrangements or adaptations of the crank
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/30—Handled filamentary material
    • B65H2701/35—Ropes, lines
    • B65H2701/357—Marking strings, e.g. pre-inked lines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
    • B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
    • B65H2701/00—Handled material; Storage means
    • B65H2701/50—Storage means for webs, tapes, or filamentary material
    • B65H2701/53—Adaptations of cores or reels for special purposes
    • B65H2701/537—Stopping the winding or unwinding of reels which do not feature spring motors

Definitions

  • the present invention relates to a chalk line device comprising a retracting device which is linked to a spool via a set of gears.
  • a chalk line is attached to said spool and may either be coiled onto said spool or uncoiled from said spool.
  • Chalk lines are widely used during building construction for marking lines on floors, walls and the like. For example, it can be used where cuts shall be made or where cabinets, shelves and other built-in furnishings are to be installed.
  • a chalk line is wound on a reel or spool and coated with dry chalk. The free end of the chalk line is held at a predetermined location and the chalk line is stretched to the opposite end of a line to be marked. The ends of the chalk line are placed against the surface to be marked and the length of the chalk line there between is stretched taut. The center of the chalk line is then drawn outwardly from that surface and released. The resiliency of the chalk line causes the line to rebound against the surface to be marked, thereby causing a linear chalk marking to be formed upon a wall or floor.
  • the object of the present invention is to provide a chalk line that overcomes the above issues.
  • the invention is based on the insight that by, at least temporarily, disconnecting a force transmission to the chalk line, it is possible to prevent the chalk line from breaking.
  • the invention relates to a chalk line device comprising a retracting device which is linked to a spool via a set of gears, a chalk line which is attached to said spool and which may either be coiled onto said spool or uncoiled from said spool.
  • Said set of gears and said spool being rotatably disposed inside a housing to rewind the uncoiled chalk line when said retracting device transmits a force onto said spool via said set of gears.
  • the chalk line device reacts when the torque reaches a threshold value by disconnecting at least one force transmitting link between two parts in the chain between the retraction device and the spool.
  • a force transmitting link may be a connection or an engagement between two parts where a force is transmitted during rewinding the chalk line.
  • connection/engagement can be between the retracting device and the set of gears, between two gears in the set of gears, between the set of gears and the spool or anywhere were it is possible to disconnect two parts in order to disconnect the links between the retraction device and the spool.
  • the set of gears may be designed in such a way that at least two connected meshing gears separate from each other when the torque exceeds the threshold value. If the link to be disconnected is between the retracting device and the set of gears, the connection can be a mutually matching engagement accomplished by mutually matching teeth where the teeth are so design that when the torque exceeds its threshold value the mutually matching teeth connection separates from each other and/or separates and connects by turns.
  • the retracting device or the set of gears may have thin wings/protrusions/flat springs which are in a force transmitting engagement/connection with the other part, i.e. the set of gears or retracting device.
  • the thin protrusion may then be so designed that it snaps over the contact area of the other part when the torque exceeds the threshold value.
  • the thin protrusion is arranged on the retracting device and the set of gears has at least one surface which connects with the thin protrusion.
  • the thin protrusion bends, due to its design, and it pass the engagement surface, i.e. the retracting device and the set of gears disconnects.
  • this could also be the done the other way around, i.e. the thin protrusion could be on the set of gears.
  • said retracting device comprises a drive shaft which comprises at least a first connection part, which connects said retracting device to said set of gears, said set of gears comprises a mutually matching second connection part adapted to connect with said first connection part of said drive shaft, wherein said force transmitting link, which is disconnectable, is between said drive shaft and said set of gears.
  • said force transmitting link may also be arranged inside the housing and may therefore be protected from the outside environment i.e. dirt and handling of the chalk line device during use, storing and transportation.
  • said first connection part of said drive shaft comprises at least one protrusion which protrudes perpendicular to a centre axis of said drive shaft and said mutually matching second connection part of said set of gears comprises at least one protrusion receiving part into which said protrusion of said drive shaft at least partly fits or matches.
  • This is an easy way, i.e. easy connection, to transmit the force from the retracting device to the set of gears. It is also easy to manufacture and to assemble.
  • One part may be fitted into the other, i.e. the protrusion into the mutually matching protrusion receiving part which may be a free space, in the area of connection, in the set of gears.
  • the protrusion may protrude in an angle which is not perpendicular to the centre axis, i.e. an angle which is larger or smaller than 90° or they may protrude in the direction of the centre axis of the drive shaft.
  • said protrusion of said first connection part of said drive shaft comprises a first guiding means
  • said second connection part comprises mutually matching first guiding elements to said first guiding means, and when said torque exceeds said threshold value said first guiding means and said first guiding element guides said drive shaft and said set of gears to move from their connected position to a disconnected position.
  • said protrusion of said first connection part of said drive shaft comprises a second guiding means, and said second connection part of said set of gears, comprises a mutual matching second guiding element to said second guiding means, wherein said second guiding means and said second guiding elements guides said drive shaft and said set of gears back from their disconnected position to a connected position.
  • said first guiding means and first guiding element each comprise an inclined surface on said protrusion and on said protrusion receiving part.
  • Inclined surfaces are easy to manufacture and easy to control.
  • the threshold value of the torque may be determined by the friction between the two inclined surfaces and the inclination of the inclined surfaces.
  • said second guiding means and second guiding elements each comprise an inclined surface on said protrusion and on said protrusion receiving part.
  • said chalk line device further comprises a spring, which is arranged in connection with said drive shaft in such a way that said spring keeps said drive shaft in connection with said set of gears when said torque is below said threshold value.
  • a spring is an easy and effective way, since a spring is flexible and can be compressed or stretched when the two parts disconnects.
  • the threshold value of the torque may also be determined by the spring force of the spring. It should be understood that a spring may also be used for embodiments in which said disconnectable force transmitted link is located elsewhere.
  • said spring is compressed when said drive shaft and said set of gears are disconnected and said spring forces said drive shaft and said set off gears back to a connected position together with said second guiding means and second guiding elements.
  • the spring will use its spring force to push the drive shaft and the set of gears back to a connected position. Instead of using a complicated mechanism this may be done automatically by using the spring force.
  • said spring is a coil spring.
  • the coil spring may be a simple coil spring off the shelf which is very cost effective or it may be a specially adapted spring. As an alternative a folded flat spring may be used.
  • said set of gears comprises an internal gear, to which said retracting device is linked, and an external gear, encircled by and in meshed contact with said internal gear, said external gear being linked to said spool. If the retraction device is connected to an internal gear which encircles an external gear, which obvious is smaller than the internal gear, the external gear will rotate faster than the internal gear, i.e. the spool will rotate faster than the retraction device when rewinding the chalk line onto the spool. That is, the set of gears of this kind accomplishes that the rewinding of the chalk line onto the spool is faster than it would be without this kind of set of gears.
  • said threshold value of said torque is defined by the friction and/or the inclination between said inclined surfaces of the first guiding means and first guiding element.
  • said threshold value of said torque is further defined by the spring force of said spring.
  • said protrusion of said first connection part disconnects from said protrusion receiving part and due to further exposure of said torque, said protrusion connects with said protrusion receiving part again or another adjacent protrusion receiving part. Due to rotational movement of the drive shaft or the set of gears the parts will disconnects and connects again.
  • the protrusion of the first connection part of the drive shaft disconnects from the protrusion receiving part of the second connection part. Due to the design and due to rotation of the two parts, i.e. the drive shaft and set of gears, the protrusion either connects the same protrusion receiving part again or an adjacent arranged protrusion receiving part.
  • the set of gears may have either one or several protrusion receiving parts. If it only has one protrusion receiving part, the protrusion will connect the same protrusion receiving part. If the set of gears has several protrusion receiving parts, the protrusion will connect the adjacent, in the rotation direction, arranged protrusion receiving part. If the drive shaft has several protrusions and the set of gears has the same number of protrusion receiving parts, the protrusions will jump/slip over to the next adjacent protrusion receiving part which is arranged in the rotation direction.
  • Fig. 1 and Fig. 2 show a chalk line device 1 comprising a housing 2a, 2b with a top part 2a and a bottom part 2b. The two parts are connected to each other by fastening means, here in shape of screws 3.
  • a retracting device 5 is linked to a spool 4 via a set of gears 9.
  • the spool 4 is mounted inside the housing 2a, 2b for rotation and for retaining a chalk line (not shown).
  • the chalk line has opposite ends. One end is secured to the spool 4 in a conventional manner. The other end of the chalk line emanates from the housing 2a, 2b through the chalk line aperture 10.
  • the chalk line may either be coiled onto the spool 4 or uncoiled from the spool 4.
  • the housing 2a, 2b also has the function to make up the chalk cavity, i.e. where the chalk is stored during use.
  • a retracting device 5, here exemplified as a crank 5 for rewinding said chalk line onto to the spool 4, is arranged onto the chalk line device 1 via a drive shaft 6 protruding through the top part 2a of the housing 2a, 2b into the cavity of the housing 2a, 2b.
  • the drive shaft 6 is releasably connected to the set of gears 9, which is arranged inside the housing.
  • the set of gears 9 connects the crank 5 to the spool 4 in such a way that when the crank 5 is rotated, the spool 4 is also rotated, however it rotates faster than the crank 5 due to the design of the set of gears 9.
  • the set of gears 9 comprises an internal gear 11 and an external gear 12.
  • the internal gear 11 is connected to the crank 5.
  • the internal gear 11 encircles the external gear 12, here exemplified as a spur gear 12.
  • the external teeth of the spur gear 12 reside in meshed engagement with the internal teeth 17 of the internal gear 11.
  • the spool 4 is formed with an axial aperture of square cross section 28 (See Fig. 2 ) with a cylindrical opening 8 adapted to receive a central, square portion 13 of the spur gear 12.
  • the drive shaft 6 is, as said above, releasably connected to the set of gears 9 by being in releasable connection with the internal gear 11.
  • the connection is established by mutually mating portions on the drive shaft 6 and on the internal gear 11 which will now be closer described (see fig. 1 ).
  • the drive shaft 6 is here exemplified as a cylindrical shaft which on its upper end (not shown in fig. 1 ) is connected to the crank 5 by a pivot shaft 7.
  • the drive shaft 6 is not limited to be cylindrical, it may have any suitable shape.
  • the drive shaft comprises a connection part 33 at its lower end.
  • connection part 33 comprises a flange 15, which is protruding from the end portion of the lower part 14 of the drive shaft 6 and several protrusions 18 protruding perpendicular to the centre axis (not shown) of the drive shaft 6 and from the flange 15 towards the upper end of the shaft and they are uniformly circumferentially arranged around the cylindrical shaft.
  • Each protrusion 18 comprises a first guiding means 29 and a second guiding means 26 here exemplified as slanted surfaces.
  • the internal gear 11 has a base 16 from which the teeth 17 of the internal gear 11 protrudes.
  • an aperture 19 arranged for receiving the drive shaft 6.
  • the aperture 19 is so large and a has a suitable shape so that the drive shaft 6 may protrude, when arranging the upper end into the aperture from the gear part side of the internal gear 11 without the flange 15 and the protrusions 18 of the drive shaft 6 passing through the aperture 19, i.e. the internal gear 11 is supported by the flange and the protrusions 18 from underneath.
  • the internal gear comprises a connection part 20, 31 which is adapted to receive the connection part 33 of the drive shaft 6, i.e. the protrusions 18 of the drive shaft 6.
  • the connection part 20, 31 of the internal gear 11 is a protrusion receiving part 31, i.e. to receive the protrusions 18 of said drive shaft 6.
  • the protrusion receiving part 31 is exemplified as the space between several protrusions 20, uniformly arranged around the aperture 19 and at the same diameter as the protrusions 18 of the drive shaft 6.
  • the number of protrusions 20 and the distance between the protrusions 20 are adapted to the number and width of the protrusions 18 on the drive shaft 6.
  • the protrusions 18 of the drive shaft shall match or at least fit into the space created between the protrusions 20 of the internal gear 11.
  • the protrusions 20 of the internal gear 11 protrudes in the same direction as the teeth 17 of the internal gear 11, and said space 31 created between the protrusions creates the receiving function.
  • the base 16 may be so thick that recesses may be arranged in it in order to make a receiving space for the protrusions 18 of the drive shaft 6.
  • the protrusions 20, i.e. the space 31 comprises a first guiding element 27 and a second guiding element 30 which are mutually matching to said first guiding means 29 and said second guiding means 26 of the drive shaft 4.
  • the first guiding element 27 and the second guiding element 30 are slanted surfaces.
  • the protrusions 18 of the drive shaft 6 fits between the protrusions 20 in a meshing engagement/connection which is established when the drive shaft 6 is arranged in the aperture 19 of the internal gear 11 in such a way that the internal gear 11 is arranged between the protrusions 18 of the drive shaft 6 and the top part 2a of the housing.
  • the drive shaft 6 is further in its lower end formed with a central cavity 22 for accommodating a compression spring 23, for example a coil spring which extends downwardly and is seated in a spring holding arrangement 24, which is part of a circular cover 25 which encloses at least partly the set of gears 9 in order to avoid chalk in the set of gears 9.
  • a compression spring 23 for example a coil spring which extends downwardly and is seated in a spring holding arrangement 24, which is part of a circular cover 25 which encloses at least partly the set of gears 9 in order to avoid chalk in the set of gears 9.
  • the spring holding arrangement 24 is a circular protruding portion wherein the spring 23 is seated. Hence, the spring 23 is sandwiched between the drive shaft 6 and the spring holding arrangement 24. When the drive shaft 6 is connected to the internal gear the compression spring is under pressure in order to hold the connected position.
  • the cover 25 is arranged between the set of gears 9 and the spool 4 and it is fixed arranged by screws 32 to the top part 2a of the housing.
  • the spring holding arrangement 24 and the cover 25 is not limited to the described design. It may have any suitable design and be attached in any suitable way.
  • the drive shaft 6 When the crank 5 is being rotated in order to rewind the chalk line, the drive shaft 6 will rotate, i.e. transmit a force on the internal gear 11 through the connection described above.
  • the spur gear 12, which is arranged at a predetermined distance from the centre axis of the internal gear 11 and in meshing contact with the teeth 17 of the internal gear 11 will rotate when the internal gear 11 rotates, i.e. the internal gear 11 transmits the force to the external gear 12, which transmit the force further to the spool, which will rotate due to their connection wherein the chalk lines is rewounded i.e. coiled up.
  • Fig. 3a shows the drive shaft 6 in connection with the internal gear 11.
  • the compression spring 23 is sandwiched between the drive shaft 6 and the spring holding arrangement 24 (only partly shown) and is under pressure to hold the drive shaft and the internal gear in a connected state.
  • the spring is, as described above, arranged in a central cavity (not shown) and attached in a suitable manner. It may however be loosely fitted inside the cavity so that the spring can the move, i.e. rotate.
  • Fig. 3b and Fig. 3c show how the drive shaft 6 disconnects from the internal gear 11.
  • the rewinding force increases.
  • the threshold value of the torque is here determined by the spring, i.e. the spring force and the inclination of and the friction force between the slanted surfaces 29 of the protrusions 18 and the slanted surfaces 27 of the internal gear 11.
  • first guiding means 29 starts to slide on the adjacent slanted surfaces 27 i.e. first guiding elements 27 of the protrusions 20 of the internal gear 11, simultaneously as the spring is being compressed (see Fig. 3b ) between the drive shaft 6 and the spring holding arrangement.
  • Fig. 3c shows when the protrusions 18 of the drive shaft 6 are totally disconnected from the internal gear 11.
  • the drive shaft 6 has been moved from a connected position with the internal gear 11 to a disconnected position. When and if the user continues trying to rewind the chalk line the drive shaft 6 goes back again to the connected position.
  • the spring is in this disconnected position in a compressed state.
  • Fig. 3d shows this, i.e. what happens when the user of the chalk line device further rotates the crank in Fig. 1 and 2 .
  • the protrusions 18 of the drive shaft 6 will connect the internal gear 11 again, however an adjacent lying protrusion receiving part 33 (se fig. 2 ) due to the second slanted surface 26 i.e. second guiding means 26 starts to slide on the adjacent slanted surfaces 30 i.e. second guiding element 30 and due to compressed spring 13 which wants to go back to its relaxed state.
  • the connection and disconnection procedure continues until the user stops rotating the crank.
  • the spool 4 will stop rewinding the caught chalk line and thereby avoiding breakage of the chalk line. Further the user will hear an indicating sound from the chalk line device 1 when it continues to disconnect and connect again until he stops rotating the crank 5.
  • the crank 5 When the chalk line is being drawn out, i.e. when it shall be used, the crank 5 is either in its locked position as shown in Fig. 2 or in a rewinding position (not shown) i.e. pivoted upwards from its locked position.
  • the crank 5 When the crank 5 is in its locked position (which is the normal position) and the chalk line is being drawn out, the spool 4 and the spur gear 12 rotates the internal gear 11 and since the crank 5 is locked the drive shaft 6 is also locked.
  • the torque exceedes the threshold value, the same happens as explained above.
  • Fig. 4 shows a second embodiment of the connection/link between drive shaft 6 and the internal gear 11.
  • the drive shaft 6 comprises thin protrusions 118 which are protruding perpendicular to the central axis (not shown) of the drive shaft.
  • the internal gear 11 of the set of gears has a receiving part 120, 130, comprising a protruding part 120 with spaces 130 for receiving the thin protrusions 118.
  • Each space 130 has a surface 135 which one thin protrusion 118 connects with.
  • the thin protrusions 118 bend, due to its design, and they pass the engagement surface 130. Hence, the retracting device and the internal gear 11 disconnects until the thin protrusions 118 reach the next space, where they connects again.

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EP20100173271 2010-08-18 2010-08-18 Kreidelinienvorrichtung mit einer Vorrichtung zum Verhindern von Schnurbruch Active EP2420388B1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP20100173271 EP2420388B1 (de) 2010-08-18 2010-08-18 Kreidelinienvorrichtung mit einer Vorrichtung zum Verhindern von Schnurbruch

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP20100173271 EP2420388B1 (de) 2010-08-18 2010-08-18 Kreidelinienvorrichtung mit einer Vorrichtung zum Verhindern von Schnurbruch

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EP2420388A1 true EP2420388A1 (de) 2012-02-22
EP2420388B1 EP2420388B1 (de) 2013-07-17

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9815320B2 (en) 2014-10-02 2017-11-14 Milwaukee Electric Tool Corporation Chalk line device
WO2019157457A1 (en) * 2018-02-12 2019-08-15 Milwaukee Electric Tool Corporation Chalk reel
USD902757S1 (en) 2018-08-20 2020-11-24 Milwaukee Electric Tool Corporation Chalk reel

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189107A (en) * 1977-06-06 1980-02-19 Stanley-Mabo S.A. Coilable rule with automatic recoil
US5683055A (en) * 1994-08-10 1997-11-04 Johnson Level & Tool Mfg. Co., Inc. Quick rewind chalk line reel
US20060144985A1 (en) * 2004-12-31 2006-07-06 Whitney Hamilton S M Chalk line device
US20090158606A1 (en) * 2007-12-19 2009-06-25 John Johnston Multi-reel marking apparatus

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4189107A (en) * 1977-06-06 1980-02-19 Stanley-Mabo S.A. Coilable rule with automatic recoil
US5683055A (en) * 1994-08-10 1997-11-04 Johnson Level & Tool Mfg. Co., Inc. Quick rewind chalk line reel
US20060144985A1 (en) * 2004-12-31 2006-07-06 Whitney Hamilton S M Chalk line device
US20090158606A1 (en) * 2007-12-19 2009-06-25 John Johnston Multi-reel marking apparatus

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9815320B2 (en) 2014-10-02 2017-11-14 Milwaukee Electric Tool Corporation Chalk line device
WO2019157457A1 (en) * 2018-02-12 2019-08-15 Milwaukee Electric Tool Corporation Chalk reel
US11801708B2 (en) 2018-02-12 2023-10-31 Milwaukee Electric Tool Corporation Chalk reel
USD902757S1 (en) 2018-08-20 2020-11-24 Milwaukee Electric Tool Corporation Chalk reel
USD969641S1 (en) 2018-08-20 2022-11-15 Milwaukee Electric Tool Corporation Chalk reel

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