CA1154258A - Apparatus for sanding timber surfaces - Google Patents
Apparatus for sanding timber surfacesInfo
- Publication number
- CA1154258A CA1154258A CA000368784A CA368784A CA1154258A CA 1154258 A CA1154258 A CA 1154258A CA 000368784 A CA000368784 A CA 000368784A CA 368784 A CA368784 A CA 368784A CA 1154258 A CA1154258 A CA 1154258A
- Authority
- CA
- Canada
- Prior art keywords
- sanding
- wheel
- belt
- wheel member
- wheel according
- 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
Links
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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B24—GRINDING; POLISHING
- B24D—TOOLS FOR GRINDING, BUFFING OR SHARPENING
- B24D13/00—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor
- B24D13/02—Wheels having flexibly-acting working parts, e.g. buffing wheels; Mountings therefor acting by their periphery
Abstract
ABSTRACT
APPARATUS FOR SANDING TIMBER SURFACES
A device for sanding surfaces, more particularly moulded surfaces, of timber components, comprises a wheel member 4 consisiting of elastomeric material. The device further comprises at least one sanding belt 6, which at least partially surrounds the circumference of the wheel member 4. The wheel member is coaxially mounted on a support bush 1. Two stressing discs 3a, 3b of metal are disposed on the support bush one on each side of the wheel member to grip the wheel member.
APPARATUS FOR SANDING TIMBER SURFACES
A device for sanding surfaces, more particularly moulded surfaces, of timber components, comprises a wheel member 4 consisiting of elastomeric material. The device further comprises at least one sanding belt 6, which at least partially surrounds the circumference of the wheel member 4. The wheel member is coaxially mounted on a support bush 1. Two stressing discs 3a, 3b of metal are disposed on the support bush one on each side of the wheel member to grip the wheel member.
Description
S~
APPARATUS FOR SANDING rrIl~B-ER SU`RFAC~S
~ he invention relates to an apparatus for sardingthesurfaces, more particularly moulded surfaces~
of timber components, with a wheel member the circum-ference of which is a-t leas-t partially surrounded by at leas-~, one sanding belt, An apparatus of this kind is intended particular]y for sanding moulding surfaces of timber components~ for ex~mple in the furniture industry. According to the prior art, these sanding wheels are provided with a rigid base member which can be mo~mted on a sanding spindle and extends over -the greater par-t of the radius of the moulding sanding wheel and the circumference of the basic member is provided with a resilient covering which in turn is surrounded on the circumference, at least indireetly, by a sanding belt. As seen in eross-sec-tional view, the eircumferential surface of -the resilient eovering has a eontour shape which complemen-ts the moulding eontour of the moulded sur~ace which is to be sanded and the sanding belt, placed or adhesively affixed to the cireumferential surface, also follows the moulding contour.
Known moulding sanding wheels suffer from the disadvan-tage tha-t they are s-till re]atively hard and therefore lmyielding despite -the resilien-t covering on -the external circumference and -that accordingly -they can be guided wi-th only sligh-t pressure against -the timber ..
Z~
which is to be sanded and that nevertheless premature loss of the abrasive particles from the sanding belt, burning or tear-ing of the sanding belt frequently occurs during the sanding operation. Sanding of timber with inaccurate mouldings there-fore gives rise to problems which interfere with production, for example in furni-ture construction. Moulding inaccuracies of this kind result necessarily from the constant regrinding of the moulding tools but also from drying of the timber, and from in-correct guiding of the workpiece on the moulding machine and so on.
It is the object of the invention to provide an improv-ed device with substantially greater resilience on the circumfer-ence but being nevertheless capable of following the timber sur-face$, which are to be finish-sanded, more closely during the sanding operation.
According to the present invention there is provided a sanding wheelfor profiled surfaces of timber components, compris-ing a wl~eel member of elastomeric material having a profiled peripheral surface, a support bush having a Elange at one end and a threaded portion at the other, a collar fitted on said thread-ed portior" a pair of retaining discs mounted on said supportbush be-tween said flange and said collar, and said wheel member being mounted on said support bush be-tween said retaining discs, the.gap between said retaining discs being approximately equal to the thickness of the wheel member to avoid significant deformation of the wheel member, a sanding belt disposed on the peripheral sur-face of the wheel member, and retaining pins provided on the re-3~ tainingdiscs engaging corresponding bores in said wheel member.
This embodiment offers -the advantage that owing to its extension resulting from centrifuyual force, the soft material of the wheel member is able to ~ield more readily during sanding;
this is because the resiliency force acts opposite to the expand-ing centrifugual force and thus provides substantial adaptation to the moulding ''Ç3 ~'~5425~
.
inaccuracies of -the material whiGh has to be sanded.
~anding does not therefore give rise to high local contact pressures between workpiece and sanding wheel with the initially described adverse consequences~ ~he sanding operation itself is improved and the service li~e o~ the sanding wheel is substan-tially prolonged. Owing to the extensib;-~ity of the wheel member and the resultant improved yield of the resilient material it is possible to operate with a relatively high sanding pressure. At excessive sanding pressures the wheel member yields more readily, or, as a result of centrifugal force, stre-tches more closely on -to the workpiece if -the con-tact pressure is too low. ~his substantially prevents abrasive particles of -the s~nding belt breaking out o~ the bond, even at a high sanding pressure, or burning of the sanding belt, By vir-tue of these working properties it is possible to obtain large moulding contours with only one sanding wheel along all planes, ~he extension obtained by centrifugal force leads to optimum penetration of the abrasive particles in-to the workpiece so that only one sanding operation achieves an exceptio~ally good result.
One fur-ther embodiment of the ;invention is arranged so tha-t one end of the support bush is provided with a flange and the other end of -the bush is provided with an internally threaded collar which can be moun-ted on an externally threaded bush portion. lhis cons-truction `
~5~Z5~
of -the moulding sanding wheel permi-ts sirnple manufacture on the one hand and the exchanging of damaged wheel members or stressing discs on the other hand.
~f~ q Duri~g sanding, the-~tr4c~i ~ discs, more particularly constructed as metal discs, prevent lateral deflection of the wheel member but permit radial extension of the wheel member such as under -the effect of centrifugal force.
Ad~antageously, a soft, extensible rubber of high quality~is used for the wheel member. ~or example, it is also possible -to use plastics materials.
~ccording to another embodimen-t of the invention ~ ny 71~ Jl,'~
the s-trc~s~g-discs are provided with re~aining pins which project inwardly against -the wheel member. ~his step 15- prevents relative rota-tion of the wheel member with respect -to the support bush. The re-taining pins are disposed coaxially opposlte each o-ther and each projects into an associated bore of the wheel member.
The invention also ex-tends to moulding sanding wheels with sanding belts which circulate over only part of the circumference of the wheel member and are also guided over a second axially parallel pulley. ~he circum~erential surface of the wheel member can have any desired and sui-table moulding profile but i-t can also be construc-ted in flat form, for example like a sanding pulley.
If an endless s~lding belt, formed by joining the ends of a s-trip, is loosely placed around the cylindrical J~lZS~
wheel member with a flat circumferential surface, it is possible for the resilient material of the belt to be extendedbycentrifugal forces during rotation of -the wheel member. Such an extension is possible however only until the increasing diameter of the wheel member has reached the width of the surroundingsanding belt. lhe walls of the cylindrical wheel member will then place from the inside against the sanding belt so that the whèel member surroundedbythe sanding belt is converted into a rigid and fixed elemen-t and the sanding advantages, which can be achieved by the resilience of the wheel member, are again lost.
In order to utili~e the advan-tages of a resilient wheel member in fla-t sanding, the sanding belt is resilient in accordance wi-th one advantageous further embodiment.
Owing to the resilience of the sanding belt, the resilience of the wheel member of rubber is also fully retained, since the sanding belt is able to adapt itself to all changes of diameter of wheel member during sanding, for example those resulting from~centrifugal forces or a varying sanding pressure.
~ anding belts comprise a paper or fabric which is provided on one side wi-th a layer of abrasive particles.
~he sanding bel-t can be assembled from a pluralit~ of strip-shaped por-tions and the joints between the portions are resilien-t in accordance with the invention. However, a preferred embodiment provides that an endless sanding ~54Z5 belt is formed from one strip by joining the free ends thereof and the joining region is resilient. ~his one resilient region is sufficient to fully ut-ilize -the advantages of the resilient wheel member in flat sanding.
A particularly simple and therefore advantageous embodimen-t of the resilien-t connec-tion provide that an overlapping resilient joining member is attached to inner belt surfaces at said ends. Rubber or plastics can be used as material for the lap portion. When butt joining the ends of a sanding belt~ the joining member is adhesively affixed to the support ply. ~o ensure a reliable adhesive join~ the resilient joining member is provided on the one side with a textile coating, more particularly cot-ton velour.
~anding belts which must be constructed so tha-t they can adapt -themselves readily to different moulding contours of -the sanding wheels are based on the circum-ferential surfaces of sectioned sanding wheels for sanding moulded su~faces of timber components. In a known sanding belt such adaptation is obtained by the sanding belt hav1ng cuts at least along one of its longitudinal sides and the sandin~ belt is adh,esively affixed to the sec-tional circumferential surface of -the sanding wheel.
~his construc-tion of the sanding bel-t still has various disadva~tages. '~le mlmber and shape of-the cutsin the sanding bel-t are different for different moulding contours so -that .
~ 258 production and stockeeping of the sanding belt becomes more expensive. '~he attachment, more particularly by adhesive joining, of the sanding belt to the moulded circumferential surface of the individual sanding wheels is time-consuming and cos-tly because the many one-sided or two-sided portions of the sanding belt formed by the cuts mus-t be pressed successively and individually ln an ordered manner upon the sanding wheel. ~rthermore, there is the disadvantage that the resilien-t sanding wheel can extend during replacement only until the increasing diame-ter of the wheel member has reached the width of the surrounding sanding belt.
In conjunction with moulded J~heel members, -the invention provides tha-t the sanding belt has asupport film which is extensible in the longitudinal direction and on which sanding portions wi-th abrasive material, more particularly sanding s-trips, are mounted.
A sanding belt constructed in this marLner bears upon the circumferen-tial mouldings of the sanding wheels ~0 without difficul-ty and over the entire surface when being placed upon the sanding wheels. ~uch a sanding belt can therefore be equally well employed, wi-thout any subsequen-t working, for a wide range o~ differen-tly contoured ~Loulded sanding wheels. Special adapta-tion of -the sanding belt -to specific mouldings is -therefore obviated for -the user of the sanding belt. Stock keeping is reduced.
In a sanding belt of this kind the sanding strips ~ ~5~f~58 are arranged on the support film at an angle to the longitudinal sides of the support film and are closely mutually adj~cent. ~he inclined arrangemen-t of the sanding s-trips improves the sanding operation i-tself.
The sanding portions to be mounted on the support film can also have any other suitable shape, for example they could be in corrugated strip form. A-ttaching the sanding portion on the support film is performed advantageously by adhesive joining with adhesives which remain resilient.
~dvantageously, the support film is constructed of rubber so as to ensure a high degree of resilience and -therefore good adaptabili-ty of th~ sanding belt -to different sanding wheel sec-tions. ~he support film can also be construc-ted of resilient plastics material or can be a resilient -f`abric.
Exemplified embodiments of the inven-tion7 disclosing additional inven-tive features, are illustrated in the accompanying drawing in which;
~ igure 1 is a section through a sanding wheel with a mouldedcircumferential surface;
~igure 2 is a section through a sanding wheel with a flat circumferential surface;
~igure ~ is a diagrammatic side view of -the sanding wheel according -to ~igure 2 during operation;
~igure L~ iS a partial sec-tion through a but-t joint of the ends of a sanding belt;
~ 25~
Figure 5 is a plan view of a sanding belt comprising a resilient support frame and sanding strips mounted there-on;
Figure 6 is an end view of the sanding belt according to Figure 5;
Figure 7 shows the sanding belt according to Figure 5 in the stretch state;
Figures 8 and 9 are partial cross-sections through moulded sanding wheel with sanding belts according to Figure 5 disposed in the wheel circumference; and Figure 10 is an enlarged plan view of the moulded sand-ing wheel according to Figure 8 with the sanding belt illustrated in Figure 5 thereon in portions.
The moulding sanding wheel shown in section in Figure 1 is provided with the support bush 1 by means of which it is slid onto a sanding spindle not shown. On one side the support bush 1 is provided with a fixedly disposed flange la. On the other side it is provided with an exter-nally threaded bush portion lb onto which an internally threaded collar 2 can be mounted. A wheel member 4 to-gether with two retaining discs 3a and 3b, bearing thereon on both sides, is slid onto the cylindrical portion of the support bush 1 and after being slid thereon said retain-ing discs are thrust by the mounted collar 2 against the flange la of the support bush and are thus axially re-tained. As apparent from the Figures, the gap between the retaining discs 3a, 3b is approximately e~ual to the thick-ness of the wheel member, which is thus not significantly deformed by the retaining discs 3a, 3h. Each of the re-taining discs 3a and 3b is provided with inwardly ~54 facing retaining pins 7 which project into open bores 8 in the wheel member. 'rhe retaining pins are welded to cY~
the ~Y~h~discs but they can also be riveted or scewmounted thereon.
The circumferential surface of the wheel member 4 has a circumferential, groove-shaped mou~Lded recess 5.
A sanding belt 6 is placed on the moulded recess 5 and on the adjoining regions of the circumferential surface of the wheel member.
1~ ~igure 2 shows a section in schematic form through a sanding wheel with a flat circumferential surface.
Identical components have the same reference numerals as those in ~igure 1~
~he circumferential surface of the wheel member ~5 supports a ring bearing thereon and comprising the sanding belt 6.
~igure 3 is a side view of the sanding wheel pro-vided with a sanding belt 6. Identical components have the same reference numerals~
~igure 3 shows a workpiece 15 which is sanded flat with a rotating sanding wheel. ~he rotating motion of the sanding wheel and the feed motion of the worl~iece 15 are both indicated by arrows.
~igure 3 indicates that the con-tact region be-tween the sanding belt 6 and the workpiece 15 is superficial and the sanding pressure is therefore distributed over the surface so -that burning of the sanding belt is avoided.
~54~58 ~he sand ng performance is again substantially higher, since using the same stress on the sanding belt it is possible to operate with a higher sanding pressure because of the larger contact surface area.
~he sanding belt 6 is joined by means of a butt joint 18 at its ends to form an endless ring surrounding the wheel member 4.
~igure 4 shows an enlarged part view in section of the butt joint 18. ~he two ends of the sanding belt comprising a support ply 9 and abrasive particle coating 10 are butted together and are joined to each other by an overlapping resilien-t joining member 11 of rubber, which is adhesively attached to the inner surface of` the support plys 9. ~uch an endless sanding belt is able to absorb resiliently changes of diameter. If the wheel member 4 of rubber, which is provided with such a sanding belt, extends as a result of centrifugal forces being applied there-to during rota-tion, the connecting lap portion 11 of rubber of the sanding belt will be stretched.
A sanding belt 21 for a sanding wheel according to the ~igure 1 is shown only partially in ~igure 5~ It comprises a support film 22 of a high grade rubber which is s-trong but stre-tchable. Narrow sanding strips 23 of emery film, for example of emery cloth, are disposed diagonally, i.e. at an angle to the longitudinal edges of the sanding belt, and are parallel by mu-tually adjacent.
~he sanding s-trips are adhesively mounted on the support ~5~Z5 _ 12 -film, more particularly by a resilierlt adhesive material.
~ igure 7 indicates that spaces 2LIa appear between the sanding strips 23 when -the sanding belt 21 is s-tretched in the longitudinal direction (as indicated by the arrows) owing to the extension of the support film 22. ~his does not reduce the security of mounting of the sanding strips on the support film.
~ igures 8 and 9 show two embodimen-ts, where, in the one embodiment, the sanding belt 21 is placed in a moulded recess 26 in the circumference of the moulding sanding wheel 25a and, in the other embodiment, the sanding belt is placed in semicircular form over the circumference of the moulding s~nding wheel 25b. Owing to its longitudinal resilience the sanding belt bears readily and comple-tely on the sectioned circumferential surfaces of -the sectioned sanding wheels. ~his is shown particularly clearly in Figure 10 which is a plan view of the sectional sanding wheel 25 a according to ~igure 8.
- ~he sanding belt, shown in portions only and placed upon the sectioned recess 26 o~ the moulded sanding whee- 25a while being simultaneously extended, is in this embodiment particularly stretched in the region outside the sec-tioned recess 26. Accordingly, spaces 24e are formed between the sanding strips 27 while the sanding strips 23 continue to be situated closely mu-tually adjacent in the innner region of the sectioned recess 26 .. . .
APPARATUS FOR SANDING rrIl~B-ER SU`RFAC~S
~ he invention relates to an apparatus for sardingthesurfaces, more particularly moulded surfaces~
of timber components, with a wheel member the circum-ference of which is a-t leas-t partially surrounded by at leas-~, one sanding belt, An apparatus of this kind is intended particular]y for sanding moulding surfaces of timber components~ for ex~mple in the furniture industry. According to the prior art, these sanding wheels are provided with a rigid base member which can be mo~mted on a sanding spindle and extends over -the greater par-t of the radius of the moulding sanding wheel and the circumference of the basic member is provided with a resilient covering which in turn is surrounded on the circumference, at least indireetly, by a sanding belt. As seen in eross-sec-tional view, the eircumferential surface of -the resilient eovering has a eontour shape which complemen-ts the moulding eontour of the moulded sur~ace which is to be sanded and the sanding belt, placed or adhesively affixed to the cireumferential surface, also follows the moulding contour.
Known moulding sanding wheels suffer from the disadvan-tage tha-t they are s-till re]atively hard and therefore lmyielding despite -the resilien-t covering on -the external circumference and -that accordingly -they can be guided wi-th only sligh-t pressure against -the timber ..
Z~
which is to be sanded and that nevertheless premature loss of the abrasive particles from the sanding belt, burning or tear-ing of the sanding belt frequently occurs during the sanding operation. Sanding of timber with inaccurate mouldings there-fore gives rise to problems which interfere with production, for example in furni-ture construction. Moulding inaccuracies of this kind result necessarily from the constant regrinding of the moulding tools but also from drying of the timber, and from in-correct guiding of the workpiece on the moulding machine and so on.
It is the object of the invention to provide an improv-ed device with substantially greater resilience on the circumfer-ence but being nevertheless capable of following the timber sur-face$, which are to be finish-sanded, more closely during the sanding operation.
According to the present invention there is provided a sanding wheelfor profiled surfaces of timber components, compris-ing a wl~eel member of elastomeric material having a profiled peripheral surface, a support bush having a Elange at one end and a threaded portion at the other, a collar fitted on said thread-ed portior" a pair of retaining discs mounted on said supportbush be-tween said flange and said collar, and said wheel member being mounted on said support bush be-tween said retaining discs, the.gap between said retaining discs being approximately equal to the thickness of the wheel member to avoid significant deformation of the wheel member, a sanding belt disposed on the peripheral sur-face of the wheel member, and retaining pins provided on the re-3~ tainingdiscs engaging corresponding bores in said wheel member.
This embodiment offers -the advantage that owing to its extension resulting from centrifuyual force, the soft material of the wheel member is able to ~ield more readily during sanding;
this is because the resiliency force acts opposite to the expand-ing centrifugual force and thus provides substantial adaptation to the moulding ''Ç3 ~'~5425~
.
inaccuracies of -the material whiGh has to be sanded.
~anding does not therefore give rise to high local contact pressures between workpiece and sanding wheel with the initially described adverse consequences~ ~he sanding operation itself is improved and the service li~e o~ the sanding wheel is substan-tially prolonged. Owing to the extensib;-~ity of the wheel member and the resultant improved yield of the resilient material it is possible to operate with a relatively high sanding pressure. At excessive sanding pressures the wheel member yields more readily, or, as a result of centrifugal force, stre-tches more closely on -to the workpiece if -the con-tact pressure is too low. ~his substantially prevents abrasive particles of -the s~nding belt breaking out o~ the bond, even at a high sanding pressure, or burning of the sanding belt, By vir-tue of these working properties it is possible to obtain large moulding contours with only one sanding wheel along all planes, ~he extension obtained by centrifugal force leads to optimum penetration of the abrasive particles in-to the workpiece so that only one sanding operation achieves an exceptio~ally good result.
One fur-ther embodiment of the ;invention is arranged so tha-t one end of the support bush is provided with a flange and the other end of -the bush is provided with an internally threaded collar which can be moun-ted on an externally threaded bush portion. lhis cons-truction `
~5~Z5~
of -the moulding sanding wheel permi-ts sirnple manufacture on the one hand and the exchanging of damaged wheel members or stressing discs on the other hand.
~f~ q Duri~g sanding, the-~tr4c~i ~ discs, more particularly constructed as metal discs, prevent lateral deflection of the wheel member but permit radial extension of the wheel member such as under -the effect of centrifugal force.
Ad~antageously, a soft, extensible rubber of high quality~is used for the wheel member. ~or example, it is also possible -to use plastics materials.
~ccording to another embodimen-t of the invention ~ ny 71~ Jl,'~
the s-trc~s~g-discs are provided with re~aining pins which project inwardly against -the wheel member. ~his step 15- prevents relative rota-tion of the wheel member with respect -to the support bush. The re-taining pins are disposed coaxially opposlte each o-ther and each projects into an associated bore of the wheel member.
The invention also ex-tends to moulding sanding wheels with sanding belts which circulate over only part of the circumference of the wheel member and are also guided over a second axially parallel pulley. ~he circum~erential surface of the wheel member can have any desired and sui-table moulding profile but i-t can also be construc-ted in flat form, for example like a sanding pulley.
If an endless s~lding belt, formed by joining the ends of a s-trip, is loosely placed around the cylindrical J~lZS~
wheel member with a flat circumferential surface, it is possible for the resilient material of the belt to be extendedbycentrifugal forces during rotation of -the wheel member. Such an extension is possible however only until the increasing diameter of the wheel member has reached the width of the surroundingsanding belt. lhe walls of the cylindrical wheel member will then place from the inside against the sanding belt so that the whèel member surroundedbythe sanding belt is converted into a rigid and fixed elemen-t and the sanding advantages, which can be achieved by the resilience of the wheel member, are again lost.
In order to utili~e the advan-tages of a resilient wheel member in fla-t sanding, the sanding belt is resilient in accordance wi-th one advantageous further embodiment.
Owing to the resilience of the sanding belt, the resilience of the wheel member of rubber is also fully retained, since the sanding belt is able to adapt itself to all changes of diameter of wheel member during sanding, for example those resulting from~centrifugal forces or a varying sanding pressure.
~ anding belts comprise a paper or fabric which is provided on one side wi-th a layer of abrasive particles.
~he sanding bel-t can be assembled from a pluralit~ of strip-shaped por-tions and the joints between the portions are resilien-t in accordance with the invention. However, a preferred embodiment provides that an endless sanding ~54Z5 belt is formed from one strip by joining the free ends thereof and the joining region is resilient. ~his one resilient region is sufficient to fully ut-ilize -the advantages of the resilient wheel member in flat sanding.
A particularly simple and therefore advantageous embodimen-t of the resilien-t connec-tion provide that an overlapping resilient joining member is attached to inner belt surfaces at said ends. Rubber or plastics can be used as material for the lap portion. When butt joining the ends of a sanding belt~ the joining member is adhesively affixed to the support ply. ~o ensure a reliable adhesive join~ the resilient joining member is provided on the one side with a textile coating, more particularly cot-ton velour.
~anding belts which must be constructed so tha-t they can adapt -themselves readily to different moulding contours of -the sanding wheels are based on the circum-ferential surfaces of sectioned sanding wheels for sanding moulded su~faces of timber components. In a known sanding belt such adaptation is obtained by the sanding belt hav1ng cuts at least along one of its longitudinal sides and the sandin~ belt is adh,esively affixed to the sec-tional circumferential surface of -the sanding wheel.
~his construc-tion of the sanding bel-t still has various disadva~tages. '~le mlmber and shape of-the cutsin the sanding bel-t are different for different moulding contours so -that .
~ 258 production and stockeeping of the sanding belt becomes more expensive. '~he attachment, more particularly by adhesive joining, of the sanding belt to the moulded circumferential surface of the individual sanding wheels is time-consuming and cos-tly because the many one-sided or two-sided portions of the sanding belt formed by the cuts mus-t be pressed successively and individually ln an ordered manner upon the sanding wheel. ~rthermore, there is the disadvantage that the resilien-t sanding wheel can extend during replacement only until the increasing diame-ter of the wheel member has reached the width of the surrounding sanding belt.
In conjunction with moulded J~heel members, -the invention provides tha-t the sanding belt has asupport film which is extensible in the longitudinal direction and on which sanding portions wi-th abrasive material, more particularly sanding s-trips, are mounted.
A sanding belt constructed in this marLner bears upon the circumferen-tial mouldings of the sanding wheels ~0 without difficul-ty and over the entire surface when being placed upon the sanding wheels. ~uch a sanding belt can therefore be equally well employed, wi-thout any subsequen-t working, for a wide range o~ differen-tly contoured ~Loulded sanding wheels. Special adapta-tion of -the sanding belt -to specific mouldings is -therefore obviated for -the user of the sanding belt. Stock keeping is reduced.
In a sanding belt of this kind the sanding strips ~ ~5~f~58 are arranged on the support film at an angle to the longitudinal sides of the support film and are closely mutually adj~cent. ~he inclined arrangemen-t of the sanding s-trips improves the sanding operation i-tself.
The sanding portions to be mounted on the support film can also have any other suitable shape, for example they could be in corrugated strip form. A-ttaching the sanding portion on the support film is performed advantageously by adhesive joining with adhesives which remain resilient.
~dvantageously, the support film is constructed of rubber so as to ensure a high degree of resilience and -therefore good adaptabili-ty of th~ sanding belt -to different sanding wheel sec-tions. ~he support film can also be construc-ted of resilient plastics material or can be a resilient -f`abric.
Exemplified embodiments of the inven-tion7 disclosing additional inven-tive features, are illustrated in the accompanying drawing in which;
~ igure 1 is a section through a sanding wheel with a mouldedcircumferential surface;
~igure 2 is a section through a sanding wheel with a flat circumferential surface;
~igure ~ is a diagrammatic side view of -the sanding wheel according -to ~igure 2 during operation;
~igure L~ iS a partial sec-tion through a but-t joint of the ends of a sanding belt;
~ 25~
Figure 5 is a plan view of a sanding belt comprising a resilient support frame and sanding strips mounted there-on;
Figure 6 is an end view of the sanding belt according to Figure 5;
Figure 7 shows the sanding belt according to Figure 5 in the stretch state;
Figures 8 and 9 are partial cross-sections through moulded sanding wheel with sanding belts according to Figure 5 disposed in the wheel circumference; and Figure 10 is an enlarged plan view of the moulded sand-ing wheel according to Figure 8 with the sanding belt illustrated in Figure 5 thereon in portions.
The moulding sanding wheel shown in section in Figure 1 is provided with the support bush 1 by means of which it is slid onto a sanding spindle not shown. On one side the support bush 1 is provided with a fixedly disposed flange la. On the other side it is provided with an exter-nally threaded bush portion lb onto which an internally threaded collar 2 can be mounted. A wheel member 4 to-gether with two retaining discs 3a and 3b, bearing thereon on both sides, is slid onto the cylindrical portion of the support bush 1 and after being slid thereon said retain-ing discs are thrust by the mounted collar 2 against the flange la of the support bush and are thus axially re-tained. As apparent from the Figures, the gap between the retaining discs 3a, 3b is approximately e~ual to the thick-ness of the wheel member, which is thus not significantly deformed by the retaining discs 3a, 3h. Each of the re-taining discs 3a and 3b is provided with inwardly ~54 facing retaining pins 7 which project into open bores 8 in the wheel member. 'rhe retaining pins are welded to cY~
the ~Y~h~discs but they can also be riveted or scewmounted thereon.
The circumferential surface of the wheel member 4 has a circumferential, groove-shaped mou~Lded recess 5.
A sanding belt 6 is placed on the moulded recess 5 and on the adjoining regions of the circumferential surface of the wheel member.
1~ ~igure 2 shows a section in schematic form through a sanding wheel with a flat circumferential surface.
Identical components have the same reference numerals as those in ~igure 1~
~he circumferential surface of the wheel member ~5 supports a ring bearing thereon and comprising the sanding belt 6.
~igure 3 is a side view of the sanding wheel pro-vided with a sanding belt 6. Identical components have the same reference numerals~
~igure 3 shows a workpiece 15 which is sanded flat with a rotating sanding wheel. ~he rotating motion of the sanding wheel and the feed motion of the worl~iece 15 are both indicated by arrows.
~igure 3 indicates that the con-tact region be-tween the sanding belt 6 and the workpiece 15 is superficial and the sanding pressure is therefore distributed over the surface so -that burning of the sanding belt is avoided.
~54~58 ~he sand ng performance is again substantially higher, since using the same stress on the sanding belt it is possible to operate with a higher sanding pressure because of the larger contact surface area.
~he sanding belt 6 is joined by means of a butt joint 18 at its ends to form an endless ring surrounding the wheel member 4.
~igure 4 shows an enlarged part view in section of the butt joint 18. ~he two ends of the sanding belt comprising a support ply 9 and abrasive particle coating 10 are butted together and are joined to each other by an overlapping resilien-t joining member 11 of rubber, which is adhesively attached to the inner surface of` the support plys 9. ~uch an endless sanding belt is able to absorb resiliently changes of diameter. If the wheel member 4 of rubber, which is provided with such a sanding belt, extends as a result of centrifugal forces being applied there-to during rota-tion, the connecting lap portion 11 of rubber of the sanding belt will be stretched.
A sanding belt 21 for a sanding wheel according to the ~igure 1 is shown only partially in ~igure 5~ It comprises a support film 22 of a high grade rubber which is s-trong but stre-tchable. Narrow sanding strips 23 of emery film, for example of emery cloth, are disposed diagonally, i.e. at an angle to the longitudinal edges of the sanding belt, and are parallel by mu-tually adjacent.
~he sanding s-trips are adhesively mounted on the support ~5~Z5 _ 12 -film, more particularly by a resilierlt adhesive material.
~ igure 7 indicates that spaces 2LIa appear between the sanding strips 23 when -the sanding belt 21 is s-tretched in the longitudinal direction (as indicated by the arrows) owing to the extension of the support film 22. ~his does not reduce the security of mounting of the sanding strips on the support film.
~ igures 8 and 9 show two embodimen-ts, where, in the one embodiment, the sanding belt 21 is placed in a moulded recess 26 in the circumference of the moulding sanding wheel 25a and, in the other embodiment, the sanding belt is placed in semicircular form over the circumference of the moulding s~nding wheel 25b. Owing to its longitudinal resilience the sanding belt bears readily and comple-tely on the sectioned circumferential surfaces of -the sectioned sanding wheels. ~his is shown particularly clearly in Figure 10 which is a plan view of the sectional sanding wheel 25 a according to ~igure 8.
- ~he sanding belt, shown in portions only and placed upon the sectioned recess 26 o~ the moulded sanding whee- 25a while being simultaneously extended, is in this embodiment particularly stretched in the region outside the sec-tioned recess 26. Accordingly, spaces 24e are formed between the sanding strips 27 while the sanding strips 23 continue to be situated closely mu-tually adjacent in the innner region of the sectioned recess 26 .. . .
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. A sanding wheel for profiled surfaces of timber components, comprising a wheel member of elastomeric material having a profiled peripheral surface, a support bush having a flange at one end and a threaded portion at the other, a collar fitted on said threaded portion, a pair of retaining discs mounted on said support bush between said flange and said col-lar, and said wheel member being mounted on said support bush between said retaining discs, the gap between said retaining discs being approximately equal to the thickness of the wheel member to avoid significant deformation of the wheel member, a sanding belt disposed on the peripheral surface of the wheel member, and retaining pins provided on the retaining discs en-gaging corresponding bores in said wheel member.
2. A sanding wheel according to claim 1, wherein said bores are through bores parallel to the axis of rotation of the wheel member, each such bore accommodating at each end thereof a retaining pin of one of said retaining discs, whereby the pins are arranged in coaxial opposed pairs.
3. A sanding wheel according to claim 1, wherein the sanding belt is resilient.
4. A sanding wheel according to claim 3, wherein the sanding belt is a single strip with ends which are resiliently joined together.
5. A sanding wheel according to claim 4, further com-prising an overlapping resilient joining member attached by ad-hesive to inner belt surfaces at said ends.
6. A sanding wheel according to claim 5, wherein the resilient joining member is provided on one side with a coating of cotton velour.
7. A sanding wheel according to claim 3, wherein the sanding belt comprises a plurality of belt portions which are resiliently joined together.
8. A sanding wheel according to claim 3, wherein the sanding belt comprises a supporting film resiliently stretchable in the longitudinal direction and sanding portions mounted on said film.
9. A sanding wheel according to claim 8, wherein the sanding portions are in the form of longitudinal strips disposed on the supporting film at an angle to the longitudinal direction of the supporting film and are closely mutually adjacent.
Applications Claiming Priority (6)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3002020.3 | 1980-01-21 | ||
| DE19803002070 DE3002070A1 (en) | 1980-01-21 | 1980-01-21 | Wood surface polishing tool - has elastic disc body gripped between metal plates on supporting bush |
| DEP3002070.3 | 1980-01-21 | ||
| DE19803002020 DE3002020A1 (en) | 1980-01-21 | 1980-01-21 | Wood surface polishing tool - has elastic disc body gripped between metal plates on supporting bush |
| DEP3036991.6 | 1980-10-01 | ||
| DE19803036991 DE3036991A1 (en) | 1980-10-01 | 1980-10-01 | Wood surface polishing tool - has elastic disc body gripped between metal plates on supporting bush |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1154258A true CA1154258A (en) | 1983-09-27 |
Family
ID=27188443
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000368784A Expired CA1154258A (en) | 1980-01-21 | 1981-01-19 | Apparatus for sanding timber surfaces |
Country Status (8)
| Country | Link |
|---|---|
| CA (1) | CA1154258A (en) |
| DK (1) | DK26181A (en) |
| ES (1) | ES498644A0 (en) |
| FR (1) | FR2473933A1 (en) |
| GB (1) | GB2069893B (en) |
| IT (1) | IT1145909B (en) |
| NL (1) | NL8007032A (en) |
| SE (1) | SE8100090L (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2256383A (en) * | 1991-06-04 | 1992-12-09 | David Javier Claridge | Abrading device with variable profile |
| JPH09193024A (en) * | 1996-01-16 | 1997-07-29 | Musashi Seimitsu Ind Co Ltd | Grinding wheel |
| US20110028074A1 (en) * | 2009-08-03 | 2011-02-03 | Canon Kabushiki Kaisha | Polishing method for a workpiece and polishing tool used for the polishing method |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2259685A (en) * | 1941-02-01 | 1941-10-21 | William C Graves | Abrading device |
| US2368760A (en) * | 1943-01-18 | 1945-02-06 | Alfred E Hamilton | Grinding roll |
| US2458217A (en) * | 1946-04-12 | 1949-01-04 | Francis H Staggs | Drum sander |
| US2494818A (en) * | 1947-05-05 | 1950-01-17 | Bata Narodni Podnik | Expansible rimmed abrading wheel |
| US2671297A (en) * | 1951-04-06 | 1954-03-09 | Bryant Grinder Corp | Method of finishing internal bores |
| US2774200A (en) * | 1955-10-10 | 1956-12-18 | Block Aleck | Abrasive polishing device |
| GB880818A (en) * | 1959-04-16 | 1961-10-25 | William Lidster | Improvements in tool attachments for power-operated hand tools |
| FR1416909A (en) * | 1964-12-09 | 1965-11-05 | Improvements made to grinding wheels | |
| US3828489A (en) * | 1973-09-24 | 1974-08-13 | D Culley | Mandrel for sanding drums |
-
1980
- 1980-12-24 NL NL8007032A patent/NL8007032A/en not_active Application Discontinuation
-
1981
- 1981-01-09 SE SE8100090A patent/SE8100090L/en not_active Application Discontinuation
- 1981-01-15 GB GB8101147A patent/GB2069893B/en not_active Expired
- 1981-01-19 CA CA000368784A patent/CA1154258A/en not_active Expired
- 1981-01-19 FR FR8100897A patent/FR2473933A1/en not_active Withdrawn
- 1981-01-20 ES ES498644A patent/ES498644A0/en active Granted
- 1981-01-20 IT IT12415/81A patent/IT1145909B/en active
- 1981-01-21 DK DK26181A patent/DK26181A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| IT1145909B (en) | 1986-11-12 |
| FR2473933A1 (en) | 1981-07-24 |
| NL8007032A (en) | 1981-08-17 |
| GB2069893B (en) | 1983-04-13 |
| ES8200830A1 (en) | 1981-11-16 |
| IT8112415A0 (en) | 1981-01-20 |
| ES498644A0 (en) | 1981-11-16 |
| SE8100090L (en) | 1981-07-22 |
| GB2069893A (en) | 1981-09-03 |
| DK26181A (en) | 1981-07-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |