Classifications

• • 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
  • F16B37/00—Nuts or like thread-engaging members
  • F16B37/08—Quickly-detachable or mountable nuts, e.g. consisting of two or more parts; Nuts movable along the bolt after tilting the nut
  • F16B37/0807—Nuts engaged from the end of the bolt, e.g. axially slidable nuts
  • F16B37/0864—Nuts engaged from the end of the bolt, e.g. axially slidable nuts with the threaded portions of the nut engaging the thread of the bolt by pressing or rotating an external retaining member such as a cap, a nut, a ring or a sleeve
• • G—PHYSICS
  • G01—MEASURING; TESTING
  • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
  • G01M1/00—Testing static or dynamic balance of machines or structures
  • G01M1/02—Details of balancing machines or devices
  • G01M1/04—Adaptation of bearing support assemblies for receiving the body to be tested
  • G01M1/045—Adaptation of bearing support assemblies for receiving the body to be tested the body being a vehicle wheel

Definitions

• the invention relates to a screw nut of the type mentioned in the preamble of claim 1 for clamping the rim of a vehicle wheel on an externally threaded end of a shaft of a balancing machine.
• a quick release nut of the type in question is known, which is used in particular for fastening a vehicle wheel on the clamping shaft of a balancing machine. It has a housing on which diametrically opposed radially directed handles are arranged. Radially movable two thread segments are arranged in the housing and are biased radially inwards by a spring up to an engagement position for the thread. The thread segments can be moved manually by actuating means radially outwards against the spring force into a disengagement position.
• This known quick release nut is used in such a way that first the vehicle wheel to be balanced is pushed with its central hole onto the shaft of the balancing machine. Then the screw nut with the threaded segments disengaged is pushed axially onto the shaft of the balancing machine, after which the actuating means for disengaging the threaded segments are relieved, so that the threaded segments are brought into engagement position by the spring, in which the internal thread of the threaded segments with the external thread the end of the wave of balancing machine are engaged. Then the quick release nut is turned using the handles attached to the housing until the rim of the vehicle wheel is tightened. This screwing over a relatively long span must be done with respect to not insignificant forces, so that the screwing is tedious.
• the invention has for its object to provide a quick release nut of the type in question, which facilitates and accelerates the tightening.
• the object on which the invention is based is achieved by the teaching specified in the characterizing part of claim 1.
• the basic idea of the invention is to provide the quick release nut with a rotary drive device which takes over the screwing process over the long screwing path and carries out this process quickly and without stress on the operator.
• the rotary drive device does not turn the whole
• the rotary drive device is arranged in a handle.
• An expedient embodiment of the invention provides for an energy store for the rotary drive device to be arranged in the housing and / or a handle. Since the energy required for the screwing process is relatively low, the energy store can be relatively small, so that it can be arranged in one movement.
• four handles are arranged in a cross shape on the housing in order to increase the storable energy, the rotary drive device being arranged in one handle and energy storage devices being arranged in further handles.
• Handle its drive shaft is expediently operatively connected to the threaded part via an angular drive, the angular drive advantageously being a pinion. If the handle is arranged inclined away from the clamping direction with respect to the axis of rotation of the quick-action clamping nut, the pinion is expediently a bevel gear drive.
• the rotary drive device can also serve to overcome the screw path, in which no noticeable clamping forces occur yet.
• one embodiment of the basic idea of the invention provides for the threaded part to be provided with two threaded segments which are biased radially inward into the engagement position by an engagement spring, actuating means being provided by means of which the threaded segments counteract the force of the engagement spring in a disengagement position are movable.
• the quick-action clamping nut according to the invention can then, like the known Sehnell clamping nut described at the outset, be pushed axially onto and over the shaft of the balancing machine in the disengaged state until noticeable clamping forces occur.
• the thread segments are expediently biased radially outward by a release spring, the force of the release spring being so much weaker than that of the engagement spring that the thread segments are constantly held in the engaged position without actuation of the actuating means.
• the actuating means are expediently operatively connected to the threaded segments via a cam drive. The design of the springs mentioned ensures that the cam drive is constantly engaged.
• the cam drive expediently has an actuating ring connected to the threaded part in a manner fixed against relative rotation, which is provided with a conical inner surface for abutment on complementarily conical shoulders of the threaded segments.
• the actuating means have a release fork, which is designed as a two-armed lever, at the ends of their forks radially inwardly projecting, engaging in an outer annular groove in the actuating ring and the other arm forms an actuating arm which, contrary to the actuation direction by the engagement spring is biased.
• Curve drive with the rotatable threaded part so both do not perform a relative rotary movement to each other, so that the cam drive is not burdened by such movements.
• the transmission of the actuation forces takes place solely through the pins at the ends of the forks of the release fork, which engage in the inwardly projecting groove of the actuation ring.
• a switch for switching on or switching the direction of rotation of the rotary drive means is expediently arranged on the clamping nut.
• These switches can expediently be two pressure switches, one of which switches on the rotary drive means in one direction and the other switch switches on the rotary drive means in the other direction of rotation.
• the switch or switches are expediently located in the vicinity of a handle, so that they can be operated, for example, with the thumb when the handle is held by hand.
• the rotary drive means expediently have an electric motor, the energy store being a battery or an accumulator.
• the accumulator can be charged in a known manner during the idle times of the quick-release nut by placing the quick-release nut in a position in which the electrical contacts provided on it come into contact with contacts of a charging device.
• inductive transmission of a charging voltage is also possible in a manner known per se, for which purpose a rectifier must then be located in the quick-action clamping nut.
• Another expedient embodiment consists in that the rotary drive means are formed by an air pressure motor.
• This has the advantage that compressed air sources are often available in tire workshops, in which the clamping nut is used in conjunction with balancing machines, which can be used to supply the rotary drive means.
• it is possible to provide an energy store in the quick-release nut, in the form of one arranged in one or more handles. neten pressure chamber.
• the rotary drive device is expediently self-locking. This has the advantage that the quick clamping nut can be used in the usual way as a manually operated nut if this is desired or if an energy source for the rotary drive device is not available or is exhausted.
• Fig. 1 shows a Schneilspannmutter according to the
• FIG. 2 shows a top view of the illustration in FIG. 1
• FIG. 3 corresponds to FIG. 1 and shows the quick-release nut in disengagement position
• FIG. 4 shows a second embodiment of the invention in a radial section similarly
• 5 is a top view of FIG. 4
• FIG. 6 shows an embodiment with a compressed air drive in a radial section
• FIG. 7 is a top view of FIG. 6.
• Fig. 1 shows a quick release nut with a housing 2, on the radial handles 4 and 6 are arranged.
• Accumulators 8 for driving an electric motor 10 arranged in the handle 6 are located in the handle 4.
• the threaded part 12 which is rotatably mounted in the housing 2 by means of ball bearings 14 and 16.
• the threaded part 12 has two radially movable thread segments 18 and 20, on each of which there is an internal thread 22 and 24.
• the threaded segments 18 and 20 are biased radially outwards by a release spring 26. Because of this Tension they are applied to an inner surface of a cylindrical extension 28 of an actuating ring 30, in which there is an outer annular groove 32, engage in the pins 34, which are located at the ends of forks 36 of a release fork 38, which is designed as a two-armed lever and around a pin 40 is rotatable and the other arm forms an actuating arm 42 which is biased by an engagement spring 44.
• a further disengaging fork 46 is provided diametrically opposite in the area of the handle 6, which is designed in the same way as the disengaging fork 38.
• the corresponding reference numbers are therefore omitted from the disengaging fork 46.
• the cylindrical extension 28 of the actuating ring 30 has a conical inner surface 48 which acts as a link and which cooperates with a conical shoulder 50 on the threaded segments 18 and 20.
• the threaded part 12 has a tapered ring gear 52 which is in engagement with a tapered gear 54 which is driven by the electric motor 10 via a shaft 56 and a planetary gear 58.
• the engagement spring 44 has pressed the actuating arm 42 to the left in the drawing and thus the pins 34 attached to the forks 36 to the right in the drawing.
• the pins 34 which engage in the annular groove 32, press the actuating ring 30 to the left in the drawing, so that the conical inner surface 48 has slid over the conical shoulders 50 of the threaded segments 18 and 20 and pressed them radially inward into the engagement position Has.
• the cylindrical inner surface of the cylindrical extension 28 lies completely on the outside of the threaded segments 18 and 20, so that these are held in a form-fitting manner in the engagement position.
• FIG. 2 shows the quick release nut according to FIG. 1 from the left, parts of the housing in the area of the fen 34 are cut away to make the engagement of these pins in the annular groove 32 become clear.
• Fig. 3 shows the quick release nut according to FIG. 1 in the disengaged position.
• the operator has pressed the actuating arm 42 to the right against the force of the engagement spring 44 with his thumb, not shown, and thereby moved the actuating ring 30 to the left by means of the pins 34 engaging in the annular groove 32.
• the conical inner surface 48 of the actuating ring 30 clears the way for the threaded segments 18 and 20 to the outside, so that they move outwards due to the force of the spring 26.
• the electric motor 10 can be switched on in different directions of rotation by means of only schematically illustrated pressure switches 60 and 62.
• a vehicle wheel to be balanced is first pushed with its central centering hole onto the end of a shaft of a balancing machine, until the centering hole abuts a centering cone which has a rear cone Compression spring has.
• the quick-release nut is then brought into a disengagement position by actuating the actuating arms 42 and pushed onto the end of the shaft of the balancing machine until it lies against the rim.
• the actuating arms 42 are then relieved, so that the internal threads 22 and 24 come into engagement with the complementarily shaped external thread on the end of the shaft of the balancing machine.
• the pressure switch 60 by actuating the pressure switch 60, the electric motor 10 is switched on in a direction of rotation in which it rotates the threaded part 12 in the screw-on and tightening direction via the gear wheel 54 and the gear ring 52.
• the quick release nut is held in rotation by means of the handles 4 and 6.
• the pressure switch 60 is relieved and the circuit to the electric motor 10 is interrupted. If necessary, the operator can now tighten the quick-release nut by hand using handles 4 and 6, thus increasing the tightening force.
• the electric motor 10 is switched on in the opposite direction of rotation by means of the pressure switch 62 and the quick-release nut is loosened until the force exerted on the rim by the compression spring behind the centering cone has largely disappeared. Thereafter, the threaded segments 18 and 20 are disengaged by actuating the actuating arms 42, so that the quick release nut can be removed from the shaft of the balancing machine and the vehicle wheel can then be removed.
• Fig. 4 shows in a radial section similar to Fig. 1, another embodiment of the invention, in which the
• Means for engaging and disengaging thread segments are omitted.
• the same or corresponding parts are provided with the same reference numbers.
• This embodiment is expedient if the end of the shaft of the balancing machine protruding over a rim is not very long.
• the circuit of the electric motor is expedient in this case as a series motor, which has a high rotational speed at low loads and a low rotational speed at high torques at high loads.
• FIG. 5 shows the tendon clamping nut according to FIG. 4 in the drawing from the left.
• pressure switches 68 and 70 are arranged, one of which acts as a switch for one direction of rotation and the other as a switch for another Direction of rotation is used.
• Fig. 6 shows another embodiment similar to Fig. 4 in the same sectional view.
• the same or corresponding parts are provided with the same reference numerals.
• the difference is that the motor is an air motor 72 which is fed by compressed air in a pressure chamber 74 which can be filled by a valve 76.
• FIG. 7 is a top view from the left of FIG. 6. It can be seen that in addition to the pressure chamber 74, four further pressure chambers 78 and 80 are provided in further cross-shaped handles 82 and 84 so as to increase the amount of stored compressed air.

Landscapes

• Engineering & Computer Science (AREA)
• General Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• Physics & Mathematics (AREA)
• General Physics & Mathematics (AREA)
• Details Of Spanners, Wrenches, And Screw Drivers And Accessories (AREA)
• Connection Of Motors, Electrical Generators, Mechanical Devices, And The Like (AREA)
• Testing Of Balance (AREA)
• Transmission Devices (AREA)

Applications Claiming Priority (3)

Publications (1)

Family

ID=7832087

Family Applications (1)

Country Status (14)

Families Citing this family (11)

Family Cites Families (14)

• 1997
  • 1997-06-11 DE DE19724523A patent/DE19724523C1/de not_active Expired - Fee Related
• 1998
  • 1998-05-27 CN CN98806012A patent/CN1260040A/zh active Pending
  • 1998-05-27 CA CA002292458A patent/CA2292458A1/en not_active Abandoned
  • 1998-05-27 US US09/424,833 patent/US6290446B1/en not_active Expired - Fee Related
  • 1998-05-27 NZ NZ501578A patent/NZ501578A/xx unknown
  • 1998-05-27 RO RO99-01310A patent/RO118085B1/ro unknown
  • 1998-05-27 PL PL98337318A patent/PL337318A1/xx unknown
  • 1998-05-27 EP EP98930736A patent/EP0988516A1/de not_active Withdrawn
  • 1998-05-27 JP JP11501427A patent/JP2000516726A/ja active Pending
  • 1998-05-27 WO PCT/EP1998/003116 patent/WO1998057137A1/de not_active Application Discontinuation
  • 1998-05-27 EE EEP199900553A patent/EE9900553A/xx unknown
  • 1998-06-10 ZA ZA985009A patent/ZA985009B/xx unknown
• 1999
  • 1999-11-30 AU AU61793/99A patent/AU742456B2/en not_active Ceased
  • 1999-12-06 NO NO995997A patent/NO995997L/no not_active Application Discontinuation
• 2001
  • 2001-09-17 US US09/953,126 patent/US20020015632A1/en not_active Abandoned

Non-Patent Citations (1)

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