Classifications

• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
  • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D17/00—Details of, or accessories for, portable power-driven percussive tools
  • B25D17/08—Means for retaining and guiding the tool bit, e.g. chucks allowing axial oscillation of the tool bit
  • B25D17/082—Retainers consisting of a swinging yoke or latching means
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
  • B25D2250/345—Use of o-rings
• • B—PERFORMING OPERATIONS; TRANSPORTING
  • B25—HAND TOOLS; PORTABLE POWER-DRIVEN TOOLS; MANIPULATORS
  • B25D—PERCUSSIVE TOOLS
  • B25D2250/00—General details of portable percussive tools; Components used in portable percussive tools
  • B25D2250/351—Use of pins
• • 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
  • F16B—DEVICES FOR FASTENING OR SECURING CONSTRUCTIONAL ELEMENTS OR MACHINE PARTS TOGETHER, e.g. NAILS, BOLTS, CIRCLIPS, CLAMPS, CLIPS OR WEDGES; JOINTS OR JOINTING
  • F16B2200/00—Constructional details of connections not covered for in other groups of this subclass
  • F16B2200/69—Redundant disconnection blocking means
  • F16B2200/71—Blocking disengagement of catches or keys

Definitions

• the present invention relates to a device for retaining a tool key for an impact demolition device.
• a shock wave is generated by the impact of a piston driven by reciprocating movements on a tool.
• This tool allows the transmission of the shock wave to the materials to be demolished.
• the tool being a wearing part of the percussive demolition device, its replacement is a common operation carried out by the operator. It is therefore necessary to have a tool retaining device which ensures that it is maintained during work, and also allows easy disassembly.
• the most used device comprises a key perpendicular to the axis of the tool, and engaged in a groove made in the tool, this key being housed in the body of the percussive demolition device.
• FIG. 1 shows a first solution.
• the body of the device is designated by the reference 2, this body being mounted between two flanges 3 forming a housing, a tool 4 being mounted in a bore of the body 2.
• the tool is retained. by a tubular key 5, inside which is engaged a threaded pin 6 locked by a nut 7, with the interposition of washers 8 between the body and the head of the axis on the one hand, and the nut 7 d 'somewhere else.
• FIG. 2 represents another embodiment in which the same elements are designated by the same references as above.
• the tool 4 is retained by two keys 9 engaged in two bores 10, the two keys being locked in their position of use by a transverse pin 12 mounted in a housing 13 disposed inside the body 2, the pin 12 itself being blocked by a pin 14 located outside the body.
• These are devices which are relatively complicated, and which are partly outside the body and are exposed to shocks during the working of the device.
• the technical problem underlying the invention is to provide a device for retaining a key, which is of a simple structure, of efficient operation and which can be adapted to low power devices, having a shape general cylindrical.
• the device which it relates to is of the type intended for a percussion demolition apparatus, in which the tool mounted in a body of the apparatus is retained by a transverse key engaged in a notch of the tool. , the key being engaged in a bore of the body.
• the area of the body comprising the bore for the engagement of the key is equipped with a covering ferrule, this ferrule being arranged to occupy a first position in which it at least partially closes the bore and a second position in which the bore is released, to allow the introduction or removal of the key.
• the body of the device is therefore covered with a thin shell which, depending on its position, closes or not the opening for fitting the key.
• the passage from the covering position of the opening to the position of release thereof can be done by rotation, or by translation along the body.
• the ferrule is made of a material with a high elastic limit, and advantageously of spring steel.
• the body of the device comprises a peripheral groove, into which opens the bore of the key, and serving for positioning and guiding the ferrule on the body.
• the peripheral groove formed in the body of the device ensures on the one hand the guiding in rotation of the shell around the body, and prevents the shell from protruding from the body, thus ensuring perfect protection of the latter, in particular against vis-à-vis the shocks that the device could undergo.
• the groove only performs the function of retaining the ferrule in the key locking position.
• the body of the device has reliefs, such as ribs or studs used for guiding the ferrule.
• the ferrule is of cylindrical shape and is constituted by a cylinder closed on itself in which is formed an opening of diameter at least equal to the diameter of the bore of the body intended for the passage of the key.
• the shell is of generally cylindrical shape and is constituted by a split ring. This ring can, depending on the embodiment, pivot on the body, or be moved in translation thereon.
• the ferrule comprises a finger, turned on its internal face, intended to come to engage in a recess of the body, to lock the ferrule in the position for covering the bore of the body intended for the passage of the key.
• Figures 1 and 2 are two cross-sectional views of two devices illustrating the state of the art.
• Figure 3 is an exploded perspective view of a demolition percussion device equipped with the device according to the invention.
• FIG. 3 represents an apparatus 20 comprising a body 22 of substantially cylindrical section terminating at one of its ends by a plate 23 for fixing on a support. In the end of the body opposite to that equipped with the plate 23, opens a bore 24 intended for the passage of a tool 25 having, in its rear zone, a notch 26.
• the bore 27 is used for the engagement of a key 29 for retaining the tool, by engagement of the key in the notch 26 of the tool 25.
• the groove 28 is intended for mounting a ferrule 30, of width corresponding substantially to that of the groove, made of a material with a high elastic limit, such as spring steel.
• the length of the ferrule is less than the perimeter of the body, in order to provide between the two ends of the ferrule a slot of width greater than the diameter of the bore 27 receiving the key 29.
• FIG. 6 represents a ferrule 30 similar to that described above, one end of which is provided with a finger 32 projecting from its internal face, this finger 32 being intended to engage in a recess 33 formed in the outer wall of the body of the device in the closed position of the ferrule, as shown in FIG. 7.
• the ferrule 30 is constituted by a split ring, which can be moved in translation on the body 22 to release, as shown in the drawing, the bore 27 for receiving a key 29
• the ferrule 30 is housed in the groove 28.
• body which was used previously in the description must be taken in the broad sense, and may just as well relate to the body of the apparatus, or a casing surrounding the body, insofar as the apparatus is more complex and comprises a body intended for guiding the tool and for the hydraulic actuation thereof, and an external casing serving to support the whole.
• the invention brings a great improvement to the existing technique, by providing a device of simple structure, perfectly integrated into the device and not at risk of being damaged during its operation, while being of a moderate cost price.
• the invention is not limited to the sole embodiments of this device, described above by way of example, on the contrary it embraces all variants.

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Percussive Tools And Related Accessories (AREA)
• Snaps, Bayonet Connections, Set Pins, And Snap Rings (AREA)
• Manufacture Of Motors, Generators (AREA)
• Hand Tools For Fitting Together And Separating, Or Other Hand Tools (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=34610657

Family Applications (1)

Country Status (13)

Families Citing this family (9)

Family Cites Families (9)

• 2003
  • 2003-12-15 FR FR0314668A patent/FR2863533B1/fr not_active Expired - Fee Related
• 2004
  • 2004-12-09 US US10/583,309 patent/US20080008523A1/en not_active Abandoned
  • 2004-12-09 AU AU2004299296A patent/AU2004299296A1/en not_active Abandoned
  • 2004-12-09 BR BRPI0417402-0A patent/BRPI0417402A/pt not_active IP Right Cessation
  • 2004-12-09 WO PCT/FR2004/003175 patent/WO2005058553A1/fr not_active Application Discontinuation
  • 2004-12-09 KR KR1020067013368A patent/KR20060123425A/ko not_active Application Discontinuation
  • 2004-12-09 JP JP2006543586A patent/JP2007513788A/ja active Pending
  • 2004-12-09 EP EP04805678A patent/EP1701823A1/fr not_active Withdrawn
  • 2004-12-09 CA CA002548114A patent/CA2548114A1/fr not_active Abandoned
  • 2004-12-09 CN CNA2004800362914A patent/CN1890062A/zh active Pending
• 2006
  • 2006-05-22 IL IL175815A patent/IL175815A0/en unknown
  • 2006-06-12 ZA ZA200604827A patent/ZA200604827B/xx unknown
  • 2006-07-14 NO NO20063287A patent/NO20063287L/no not_active Application Discontinuation

Non-Patent Citations (2)

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