DE3509042A1 - Pressure-operated combination brake - Google Patents

Pressure-operated combination brake

Info

Publication number
DE3509042A1
DE3509042A1 DE19853509042 DE3509042A DE3509042A1 DE 3509042 A1 DE3509042 A1 DE 3509042A1 DE 19853509042 DE19853509042 DE 19853509042 DE 3509042 A DE3509042 A DE 3509042A DE 3509042 A1 DE3509042 A1 DE 3509042A1
Authority
DE
Germany
Prior art keywords
brake
piston
pressure medium
actuated
pressure
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.)
Withdrawn
Application number
DE19853509042
Other languages
German (de)
Inventor
Erfinder Wird Nachtraeglich Benannt Der
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.)
Bubenzer Bremsen Gerhard Bubenzer Ing GmbH
Original Assignee
Bubenzer Bremsen Gerhard Bubenzer Ing 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 Bubenzer Bremsen Gerhard Bubenzer Ing GmbH filed Critical Bubenzer Bremsen Gerhard Bubenzer Ing GmbH
Priority to DE19853509042 priority Critical patent/DE3509042A1/en
Publication of DE3509042A1 publication Critical patent/DE3509042A1/en
Withdrawn legal-status Critical Current

Links

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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/228—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a separate actuating member for each side
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B66—HOISTING; LIFTING; HAULING
    • B66D—CAPSTANS; WINCHES; TACKLES, e.g. PULLEY BLOCKS; HOISTS
    • B66D5/00—Braking or detent devices characterised by application to lifting or hoisting gear, e.g. for controlling the lowering of loads
    • B66D5/02—Crane, lift hoist, or winch brakes operating on drums, barrels, or ropes
    • B66D5/24—Operating devices
    • B66D5/26—Operating devices pneumatic or hydraulic
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D49/00—Brakes with a braking member co-operating with the periphery of a drum, wheel-rim, or the like
    • F16D49/16—Brakes with two brake-blocks
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/2245—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members in which the common actuating member acts on two levers carrying the braking members, e.g. tong-type brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D55/00—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes
    • F16D55/02—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members
    • F16D55/22—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads
    • F16D55/224—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members
    • F16D55/225—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads
    • F16D55/226—Brakes with substantially-radial braking surfaces pressed together in axial direction, e.g. disc brakes with axially-movable discs or pads pressed against axially-located rotating members by clamping an axially-located rotating disc between movable braking members, e.g. movable brake discs or brake pads with a common actuating member for the braking members the braking members being brake pads in which the common actuating member is moved axially, e.g. floating caliper disc brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D65/00—Parts or details
    • F16D65/14—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position
    • F16D65/16—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake
    • F16D65/18—Actuating mechanisms for brakes; Means for initiating operation at a predetermined position arranged in or on the brake adapted for drawing members together, e.g. for disc brakes
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2121/00—Type of actuator operation force
    • F16D2121/02—Fluid pressure
    • F16D2121/12—Fluid pressure for releasing a normally applied brake, the type of actuator being irrelevant or not provided for in groups F16D2121/04 - F16D2121/10
    • 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
    • F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
    • F16D2123/00—Multiple operation forces

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Braking Arrangements (AREA)

Abstract

Published without abstract.

Description

Druckmittelbetätigte KombinationsbremsePressure fluid operated combination brake

Für viele Anwendungsfälle wie Förderanlagen, Skilifte usw.For many applications such as conveyor systems, ski lifts, etc.

sind zwei getrennte Bremssjrsteme erforderlich, eine Betriebsbremse, welche das erforderliche Bremsmoment gesteuert oder geregelt aufbringt, und eine Slcherheltsbremse, welche bei Stromausfall automatisch die ganze Anlage stillsetzt.two separate brake systems are required, a service brake, which applies the required braking torque in a controlled or regulated manner, and a Safety brake, which automatically shuts down the entire system in the event of a power failure.

Für solche Anwendungsfalle werden vielfach zwei getrennte Bremsen eingesetzt. bs sind Anordnungen bekannt, bei welchen zwei getrennte Bremsgeräte auf eine Bremse ein wirken. Bekannt sind Trommelbremsen, welche die Sicherheitspunktion über ein bLDRO-Gerat betreiben und die Betriebsbremse über einen getrennten dydraulikzylinder. BeKannt sind auch Scheibenbremsen, bei denen die blcherheltstunktion uber einen Elektromagneten erfolgt und die Betriebsbremse über einen Hydraulikzylinder.For such applications there are often two separate brakes used. bs arrangements are known in which two separate braking devices act on a brake. Drum brakes are known, which have the safety function operate via a bLDRO device and the service brake via a separate hydraulic cylinder. Disc brakes are also known in which the brake function has a Electromagnet and the service brake via a hydraulic cylinder.

Die vorliegende Erfindung vermeidet diesen komplizierten Aufbau durch Anwendung eines Bremszylinders mit zwei koaxlal angeordneten druckmittel-betätigten Kolben.The present invention avoids this complicated structure Use of a brake cylinder with two coaxially arranged pressure medium-actuated Pistons.

Beschreibung Die Figur l zeigt ein Beispiel der Erfindung in Form einer einfach wirkenden Scheibenbremse. Die Bremse ist in gelüftetem Zustand dargestellt, der Ringraum l der Sicherheitsbremse steht unter Druck und hat den Kolben 2 gegen die Kraft der Tellerfedern 5 an das Gehäuse s gedruckt, der Ringraum 5 der Betriebsbremse mit dem Ringkolben ist drucklos. Beine oder mehrere Druckfedern / schieben die Tragerplatte d mit dem Bremsbelag 9 in Richtung Gehause 4, um den Luftspalt lo freizugeben.Description Figure 1 shows an example of the invention in form a single-acting disc brake. The brake is shown in the released state, the annular space l of the safety brake is under pressure and has the piston 2 against the force of the disc springs 5 is printed on the housing s, the annular space 5 of the service brake with the annular piston is depressurized. Legs or several compression springs / slide the support plate d with the brake lining 9 in the direction of the housing 4 to release the air gap lo.

Die Trägerplatte 8 ist axial verschiebbar auf den fest mit dem Gehäuse 4 verbundenen Stiften lO zur Aufnahme der Reaktionskrafte gelagert.The carrier plate 8 is axially displaceable on the fixed with the housing 4 connected pins 10 stored to absorb the reaction forces.

Im Inneren des Kolbens 2 befindet sich die Druckstange II, sie ist am vorderen Teil durch ein Gewinde 12 mit dem Kolben 2 verbunden, das hintere Ende ist axial verschiebbar:uber eine PalJfeder 13 in dem Einstellflansch 14 gelagert. Dieser Flansch ist mit einer oder mehreren Schrauben 15 an dem gehäuse 4 befestigt.ßurch Verdrehung des Flansches 14 gegen das Gehäuse 4, nach Lösen der Schrauben 15. Kann die Druckstange 11 im Kolben 2 durch das Gewinde 12 relativ zum Kolben 2 axial bewegt werden und dadurch der Luftspalt lo eingestellt werden.Inside the piston 2 is the push rod II, it is connected at the front part by a thread 12 to the piston 2, the rear end is axially displaceable: mounted in the adjusting flange 14 via a spring 13. This flange is fastened to the housing 4 with one or more screws 15 Rotation of the flange 14 against the housing 4, after loosening the screws 15. Can the push rod 11 in the piston 2 is moved axially through the thread 12 relative to the piston 2 and thereby the air gap lo can be set.

Funktion bei der in Figur 1 gezeichneten Stellung bei ausgeschalteter Sicherheitsbremse durch den Druck des Druckmittels im Ringraum 4 kann durch den Druck im Ringraum 5 der Ringkolben 6 der Betriebsbremse axial verschoben und uber die Trägerplatte b mit dem Bremsbelag 9, die Bremsscheibe 16 gegen den fest mit dem gehäuse verbundenen Bremsbeiag 17 gepreßt werden. Durch die Hohe des Druckes im Ringraum 5 läßt sich das Bremsmoment der Betriebsbremse beliebig einstellen.Function in the position shown in Figure 1 when switched off Safety brake by the pressure of the pressure medium in the annular space 4 can through the Pressure in the annular space 5 of the annular piston 6 of the service brake shifted axially and over the carrier plate b with the brake lining 9, the brake disc 16 against the fixed with the housing connected Bremsbeiag 17 are pressed. Due to the amount of pressure In the annular space 5, the braking torque of the service brake can be set as desired.

im Sicherheitsfalle (beispielsweise durch Stromausfall) sinkt der Druck im Ringraum 1 ab und die Kraft der Tellerfedern 5 wirkt uber den Kolben 2, Drucstange 1 11, Tragerplatte 8 mit dem Bremsbelag 9 aut die Bremsscheibe 16 und preßt diese gegen den Bremsbelag 17 am Gehause 4; damit ist die Sicherheitsbremse eingeschaltet.in the event of security (for example due to a power failure) the Pressure in the annular space 1 and the force of the disc springs 5 acts via the piston 2, Push rod 11, support plate 8 with the brake lining 9 aut the brake disc 16 and presses this against the brake lining 17 on the housing 4; so that is the safety brake switched on.

figur 2 zeigt eine Bremse mit zwei symmetriscn angeordneten Bremszylindern nach Figur 1.Figure 2 shows a brake with two symmetrically arranged brake cylinders according to Figure 1.

In Figur j ist eine Zangenbrembe dargestellt, bei der die gleiche Anordnung der druckmittelbetätigten Kolben für Betriebs- und Sicherheitsbremse wie in Figur 1 vorhanden ist.In Figure j, a caliper is shown in which the same Arrangement of the pressure medium-actuated pistons for service and safety brakes such as in Figure 1 is present.

Mit der gleichen Anordnung läßt sich auch eine Trommelbremse nach Figur 4 betreiben. Da hierbei eine Umkehr der Kraftrichtung fur die Bremsung erforderlicl. ist, wird an Stelle der Druckstange 11 in Figur 1 eine Zugstange 21 verwendet und zum Einstellen des Lüftspaltea 22 ist ein Gewinde 25 in der DrucKiÜche 24 vorgesehen.A drum brake can also be relieved with the same arrangement Figure 4 operate. Since this requires a reversal of the direction of force for braking. is, instead of the push rod 11 in Figure 1, a pull rod 21 is used and a thread 25 is provided in the pressure 24 to adjust the air gap a 22.

Figur 5 zeigt die Moglichkeit an Stelle des Hingkolbens 6 in Figur l, 2 oder mehrere blnfachkolben 26 anzuordnen.FIG. 5 shows the possibility in place of the swinging piston 6 in FIG l, 2 or more flat flasks 26 to be arranged.

-L e e r s e i t e--L e e r s e i t e-

Claims (11)

Patentansprüche I. Druckmittelbetätigte Kombinationsbremse rur getrennte betätigung der Betriebs- und Sicheerheitbremse, dadurch geKennzelchnet, daß der Kolben für die Betätigung der Betriebsbremse als Ringkolben b ausgebildet ist und Koaxial auf dem Kolben 2 fur die Sicherheitsbremse angeordnet ist.Claims I. Pressure medium-operated combination brake for separate ones actuation of the service and safety brake, characterized by the fact that the Piston for actuating the service brake is designed as an annular piston b and Is arranged coaxially on the piston 2 for the safety brake. 2. Druckmittelbetätigte Kombinationsbremse nach Anspruch 1, dadurch gekennzeichnet, daß der DrucKraum 1 zur Betätigung der Sicherheitsbremse als Ringraum ausgebildet ist.2. Pressure medium-actuated combination brake according to claim 1, characterized characterized in that the pressure chamber 1 for actuating the safety brake as an annular space is trained. 3. Druckmittelbetätigte Kombinationbremse nach Anspruch 1, dadurch gekennzeichnet, daß im hinteren Hohlraum des Kolbens 2 Tellerfedern 3 für die Sicherheitsbremse angeordnet sind.3. Pressure medium-actuated combination brake according to claim 1, characterized characterized in that in the rear cavity of the piston 2 disc springs 3 for the safety brake are arranged. 4.Druckmittelbetätigte Kombinationbremse nach Anspruch 1, dadurcn gekennzeicnnet, daß sich im Kolben 2 eine Druckstange ii mit Gewinde 12 und Paßfeder 15 befindet, die durch den Flansch 14 relativ zum Kolben 2 verdreht werden kann und damit den Lüftspalt lO verändert.4. Pressure medium-actuated combination brake according to claim 1, dadurcn gekennzeicnnet that in the piston 2 there is a push rod ii with thread 12 and key 15 is located, which can be rotated relative to the piston 2 by the flange 14 and thus changed the air gap lO. 5. Drückmittelbetätigte Kombinationsbremse nach Anspruch 1, dadurch gekennzeichnet1 dalJ die Bremse als einfachwirkende Scheibenbremse wie in Figur 1 ausgebildet ist.5. Press-means-operated combination brake according to claim 1, characterized characterized1 that the brake is a single-acting disc brake as shown in the figure 1 is formed. 6. Druckmittelbetatigte Kombinationsbremse nach Anspruch 1, dadurch gekennzeichnet, daß die Bremse ala doppeltwirkende Scheibenbremse wie in figur 2 ausgebildet ist.6. Pressure medium-actuated combination brake according to claim 1, characterized characterized that the brake ala double-acting disc brake as in Figure 2 is trained. 7. Druckmittelbetatigte Kombinationsbremse nach Anspruch 7, dadurch gekennzeichnet, daß die bremse als Zangen-Scheibenbremse wie an Figur 5 ausgebildet ist.7. Pressure medium-actuated combination brake according to claim 7, characterized characterized in that the brake is designed as a caliper disc brake as in FIG is. 8. Druckmittelbetätigte Kombinationsbremse nach Anspruch 1, dadurch gekennzeichnet, da.lj die bremse als Trommelbremse wie in Figur 4 ausgebildet ist.8. Pressure medium-actuated combination brake according to claim 1, characterized marked, da.lj the brake is designed as a drum brake as in FIG. 9. Druckmittelbetätigte Kombinationsbremse nach Anspruch 8, dadurch gekennzeichnet, daß durch den Kolben für die Sicherheitsbremse eine Zugstange 21 geführt ist, welche ein Gewinde 23 besitzt, auf dem sich die Drucklasche 24 befindet und durch Verdrehung der Drucklasche 24 auf dem Gewinde 23 der Zugstange 21 der Lüftspalt 22 der Bremse verändert werden kann.9. Pressure medium-actuated combination brake according to claim 8, characterized characterized in that a pull rod 21 through the piston for the safety brake is guided, which has a thread 23 on which the pressure tab 24 is located and by rotating the pressure tab 24 on the thread 23 of the pull rod 21 of the Ventilation gap 22 of the brake can be changed. 10. Druckmittelbetätigte Kombinationsbremse nach Figur 5, bei der anstelle des Ringkolbens 6 der Figur 1 zwei oder mehrere Einfachkolben 26 für die Betriebsbremse angeordnet sind.10. Pressure medium-actuated combination brake according to Figure 5, in which instead of the annular piston 6 of Figure 1, two or more single pistons 26 for the Service brake are arranged. 11. Druckmittelbetätigte Koinbinationsbremse nach Anspruch 1, dadurch gekennzeichnet,,daß die Funktion der druckmittelbetätigten Kolben getauscht ist. Die Funktion der Sicherheitsbremse erfolgt dann über den Ringkolben.11. Pressure medium-actuated combination brake according to claim 1, characterized marked ,, that the function of the pressure medium-actuated piston is swapped. The function of the safety brake then takes place via the annular piston.
DE19853509042 1985-03-14 1985-03-14 Pressure-operated combination brake Withdrawn DE3509042A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE19853509042 DE3509042A1 (en) 1985-03-14 1985-03-14 Pressure-operated combination brake

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19853509042 DE3509042A1 (en) 1985-03-14 1985-03-14 Pressure-operated combination brake

Publications (1)

Publication Number Publication Date
DE3509042A1 true DE3509042A1 (en) 1986-09-18

Family

ID=6265115

Family Applications (1)

Application Number Title Priority Date Filing Date
DE19853509042 Withdrawn DE3509042A1 (en) 1985-03-14 1985-03-14 Pressure-operated combination brake

Country Status (1)

Country Link
DE (1) DE3509042A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7328778B2 (en) 2005-08-04 2008-02-12 Hillmar Industries Ltd. Wheel brake caliper
WO2023148463A1 (en) 2022-02-07 2023-08-10 Stromag France Sas Disc brake for a lifting machine combining a positive brake and a negative brake

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US7328778B2 (en) 2005-08-04 2008-02-12 Hillmar Industries Ltd. Wheel brake caliper
US7815020B2 (en) 2005-08-04 2010-10-19 Hillmar Industries Ltd. Wheel brake caliper
WO2023148463A1 (en) 2022-02-07 2023-08-10 Stromag France Sas Disc brake for a lifting machine combining a positive brake and a negative brake
FR3132516A1 (en) * 2022-02-07 2023-08-11 Stromag France Sas Disc brake for lifting gear, combining positive brake and negative brake

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8141 Disposal/no request for examination