EP0016782B1 - Drum for sanding belt - Google Patents

Drum for sanding belt Download PDF

Info

Publication number
EP0016782B1
EP0016782B1 EP19790900663 EP79900663A EP0016782B1 EP 0016782 B1 EP0016782 B1 EP 0016782B1 EP 19790900663 EP19790900663 EP 19790900663 EP 79900663 A EP79900663 A EP 79900663A EP 0016782 B1 EP0016782 B1 EP 0016782B1
Authority
EP
European Patent Office
Prior art keywords
drum
web
flanges
sanding belt
belt
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.)
Expired
Application number
EP19790900663
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0016782A1 (en
EP0016782A4 (en
Inventor
Edward Harrison Phillips
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.)
Mechanical Plastics Corp
Original Assignee
Mechanical Plastics Corp
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 Mechanical Plastics Corp filed Critical Mechanical Plastics Corp
Publication of EP0016782A4 publication Critical patent/EP0016782A4/en
Publication of EP0016782A1 publication Critical patent/EP0016782A1/en
Application granted granted Critical
Publication of EP0016782B1 publication Critical patent/EP0016782B1/en
Expired legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B24—GRINDING; POLISHING
    • B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
    • B24D9/00—Wheels or drums supporting in exchangeable arrangement a layer of flexible abrasive material, e.g. sandpaper
    • B24D9/02—Expansible drums for carrying flexible material in tubular form, e.g. expanded by centrifugal force

Definitions

  • Rotary drums for sanding belts have been used in the past but, for the most part, they are made up of several parts and require assembly which adds to production costs. Also, a major drawback of drums previously made for this purpose is the relatively short operating life re- quring replacement and adding to the overall cost of sanding operations. Because of these drawbacks a need has arisen for an improved drum for sanding belts wherein the drum is of simple and rugged construction, has a long operating life and can be produced at minimal cost.
  • the drum shown in this reference is of sponge rubber material and is therefore relatively soft. It is provided with a smooth outer surface either by so casting the rubber or by cementing a peripheral band to the sponge body. In either case this need for a special outer surface complicates the construction of the drum. Furthermore, in addition to a central driving pin, the drum is provided with a central driving hub through which the pin passes. This again complicates the manufacture of the drum because the hub portion requires assembly to the body of the drum.
  • the drum body In order to secure the abrasive band to the drum body the drum body is made fractionally larger than the band so that it has to be compressed to allow mounting of the abrasive band.
  • the abrasive band In operation the abrasive band is held both by the precompression in the sponge rubber material and also by the effects of centrifugal force acting on the yieldable core of the drum.
  • a further drum for a sanding belt is shown in GB-A-992 300.
  • the body of the drum is made of foamed plastic material and is provided with special abrasive strips at its surface which coact with the inner surface of the abrasive band to retain the same on the drum.
  • the body of this drum is, in similar fashion to the drum of US-A-22 21 173 of relatively thick-walled construction and has at most only vestigal flanges. Again a special driving hub is provided which leads to unnecessary complications when manufacturing the drum.
  • the object of the present invention is to provide an improved drum for sanding belts which is of simple and rugged construction, has a long operating life, can be produced at minimal cost and which nevertheless ensures that the abrasive band remains in position on the drum during use.
  • a drum for a sanding belt in which a drum body has a central web having a central pin-receiving hole, a circular outer periphery, and a pair of flanges integral with the web and projecting laterally from opposed sides of said outer periphery, characterised in that said web has a boss integral therewith and surrounding said central pin receiving hole; in that the drum body is formed from a natural rubber having a hardness in the range of 45-65 Durometer; and in that the web and flanges are of thin wall construction with the radially inner surfaces of the flanges diverging conically away from the web at an angle whereby to permit the flanges to be sufficiently flexible so as to bow radially outwardly due to centrifugal force as the web expands radially outwardly upon rotation of the drum.
  • the drum body is of a one-piece construction which therefore greatly simplifies manufacture.
  • the web portion of the drum has an integral boss with a central pin receiving hole which ensures that the drive for the drum can be readily transmitted to the drum without having to make the web unduly thick.
  • the use of a natural rubber having a hardness in the range 45-65 Duro- meters for the drum body enables the use of a relatively thin-walled construction which facilitates manufacture and also retention of the abrasive band on the drum.
  • the conically diverging flanges not only simplify the manufacturing process but also assist in the outward bowing of the flanges under centrifugal force which contributes to reliable retention of the abrasive band thus ensuring that the band does not move circumferentially around the drum or axially of the drum when the drum and belt are rotated.
  • the drum has a pair of annular ribs at the outer side extremities of the two flanges.
  • a sanding belt having a pair of axially spaced inner peripheral shoulders on the inner surface of the belt is used with this type of drum so that the ribs engage the shoulders when the belt is on the drum to prevent axial movement of the belt on the drum.
  • a first embodiment of the sanding belt drum of this invention is broadly denoted by the numeral 10 and is shown in Figs. 1, 2 and 5.
  • Drum 10 is formed from a resilient material and comprises a circular, flexible, imperforate central web 12 and a pair of flexible outer peripheral flanges 14 integral with web 12 so that drum 10 is of a one-piece construction.
  • the web and flanges are preferably formed simultaneously in a molding process.
  • the web is of a thin wall construction and, as shown in Figs. 2 and 5, is provided with a pair of bosses 16 at the center thereof for support purposes.
  • the bosses project laterally from opposite sides of the web. While Fig. 5 shows the sides of the web parallel with each other, they could be tapered from the center outwardly with the thinnest part near the outer periphery of the web to provide additional support.
  • a pin 18 extends through the boss and the web as shown in Fig. 2.
  • a chuck 20 on a hand drill or the like can grip the pin for rotating drum 10 about the central axis of web 12.
  • Flanges 14 have cylindrical outer surfaces and project laterally in opposed directions from the outer periphery of web 12 as shown in Figs. 2 and 5.
  • the flanges have respective integral ribs 22 at their outer extremities. These ribs are formed with the flanges in a molding process.
  • the flanges have a thin wall construction and, because they are resilient, they are essentially flexible so as to flex radially outwardly when subjected to centrifugal force.
  • web 12 being of a thin wall construction, and formed from a resilient material can expand or stretch radially outwardly under centrifugal force as drum 10 is rotated at high speed, such as 2200 rpm or the like. This assures a positive frictional engagement between the web and the flanges and the inner surface of a sanding belt mounted on the drum for rotation.
  • ribs 22 are provided for use with a sanding belt 24 (Fig. 6) which comprises a band 26 provided with annular shoulders 28 on the inner surface thereof at locations spaced inwardly from the opposed sides thereof. These shoulders can be formed by securing a band to the inner surface of band 26 with the inner band having an axial length less than that of band 26.
  • Drum 10 has the following typical dimensions: Maximum diameter of about 3.80 inches, web thickness of about .25 inch, total axial length of flanges 14 of about 1.40 inches, and angle a (Fig. 3) of about 5°. The radially inner surfaces of the flanges thus diverge conically away from the web at the angle a.
  • the material of drum 10 is typically 55 Durometer natural rubber but can have a hardness in the range of 45-65 Durometer.
  • pin 18 is secured in the conventional manner to chuck 20 and sanding belt 24 is then placed on the drum and seated on the flanges 14 in the manner shown in Fig. 5. Then the hand drill associated with chuck 20 is actuated to rotate drum 10 and thereby permit the sanding of a surface by the outer surface of band 26 which is provided with an abrasive in the usual manner.
  • web 12 will expand radially outwardly and flanges 14 will flex outwardly yet web 12 will generally maintain its disc-like shape since it is rotating in its own plane.
  • Fig. 3 illustrates another embodiment of drum 10, namely drum 10a.
  • This drum is substantially the same in all respects as drum 10 except that drum 10a has no ribs 22.
  • drum 10a has a completely cylindrical outer surface and is adapted for use with a sanding band 24a which may have abrasive on both its inner and outer surfaces.
  • Abrasive need not be on the inner surface and, if used, it need not cover the entire inner surface as shown in Fig. 4. If used, however, the abrasive on the inner surface provides greater friction between the drum 10 and the sanding belt.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
EP19790900663 1978-06-07 1980-01-14 Drum for sanding belt Expired EP0016782B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US91372178A 1978-06-07 1978-06-07
US913721 1978-06-07

Publications (3)

Publication Number Publication Date
EP0016782A4 EP0016782A4 (en) 1980-08-20
EP0016782A1 EP0016782A1 (en) 1980-10-15
EP0016782B1 true EP0016782B1 (en) 1983-06-08

Family

ID=25433521

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19790900663 Expired EP0016782B1 (en) 1978-06-07 1980-01-14 Drum for sanding belt

Country Status (6)

Country Link
EP (1) EP0016782B1 (enrdf_load_stackoverflow)
JP (1) JPS555295A (enrdf_load_stackoverflow)
BR (1) BR7903626A (enrdf_load_stackoverflow)
CA (1) CA1111255A (enrdf_load_stackoverflow)
DE (1) DE2965607D1 (enrdf_load_stackoverflow)
WO (1) WO1980000033A1 (enrdf_load_stackoverflow)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0110699A1 (en) * 1982-12-01 1984-06-13 Solex (U.K.) Limited - In Liquidation An air/fuel induction system for a multi-cylinder internal combustion engine
JPS6116259U (ja) * 1984-07-04 1986-01-30 東京バフ株式会社 無端研磨ベルト用遠心保持輪
US4870787A (en) * 1986-08-20 1989-10-03 Theodore Voorhees Sanding wheel
DE29716041U1 (de) * 1997-09-08 1999-01-14 MV Marketing und Vertriebs-GmbH & Co. KG Wieländer + Schill, 78054 Villingen-Schwenningen Werkzeug zur materialabtragenden Bearbeitung

Family Cites Families (23)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CA545597A (en) * 1957-09-03 E. Landau Miles Abrasive wheels with conforming rims
DE559229C (de) * 1932-09-17 Albert Fezer Umlaufende, mit Schleifpapier ueberzogene Schleifwalze
US1033934A (en) * 1911-07-10 1912-07-30 Robert Reid Pulley.
GB416076A (en) * 1933-03-09 1934-09-10 Rupert Evelyn Law Warburton Improvements in and relating to abrading wheels
US2221173A (en) * 1938-08-06 1940-11-12 Robert S Gutsell Sanding or polishing wheel
US2494818A (en) * 1947-05-05 1950-01-17 Bata Narodni Podnik Expansible rimmed abrading wheel
US2700257A (en) * 1952-01-22 1955-01-25 Miles E Landau Abrasive wheel with conforming rim
US2798342A (en) * 1956-07-25 1957-07-09 Lou C Casanov Grinding wheels
US2963833A (en) * 1957-08-06 1960-12-13 Mermac Products Inc Expansible wheel and hub structure
US2874519A (en) * 1957-08-06 1959-02-24 Mermac Products Inc Expansible abrasive wheel
US2881572A (en) * 1958-01-24 1959-04-14 Arthur A Miller Grinding wheels
BE603897A (fr) * 1960-06-22 1961-09-18 Pirelli Pneumatique à bandages multiples pour rouler sur des sols meubles
US3083584A (en) * 1960-07-09 1963-04-02 Nanson Arthur Contact or similar wheels for abrasive belts or the like
US3188775A (en) * 1961-09-25 1965-06-15 William J Cosmos One piece industrial wheel
US3142192A (en) * 1962-03-19 1964-07-28 Minnesota Mining & Mfg Friction faced pulley
US3140621A (en) * 1962-04-02 1964-07-14 Guthrie B Stone Pulley hub with crowned outer face
US3211016A (en) * 1962-04-02 1965-10-12 Andrew G Carter Wheel assembly for band saws
GB992300A (en) * 1963-05-13 1965-05-19 William Lidster Improvements in sanding tool attachments for power-operated hand tools
US3545142A (en) * 1968-05-24 1970-12-08 William E Sullenberger Abrading implements
US3597883A (en) * 1969-02-26 1971-08-10 Robert L Choplin Power-sanding device
US3698141A (en) * 1971-01-27 1972-10-17 Amsted Ind Inc Modular abrasive wheel assembly
DE2432815A1 (de) * 1974-07-09 1976-01-29 Hacoba Textilmaschinen Treibrad, insbesondere treibriemenscheibe fuer textilmaschinenantriebe
US4067149A (en) * 1977-03-14 1978-01-10 Ali Frank F Sanding, buffing and polishing tools

Also Published As

Publication number Publication date
JPS6146274B2 (enrdf_load_stackoverflow) 1986-10-13
EP0016782A1 (en) 1980-10-15
BR7903626A (pt) 1980-02-05
CA1111255A (en) 1981-10-27
WO1980000033A1 (en) 1980-01-10
EP0016782A4 (en) 1980-08-20
JPS555295A (en) 1980-01-16
DE2965607D1 (en) 1983-07-14

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