US3597883A

US3597883A - Power-sanding device

Info

Publication number: US3597883A
Application number: US802361A
Authority: US
Inventors: Robert L Choplin; Walter D Hodge
Original assignee: Individual
Current assignee: Individual
Priority date: 1969-02-26
Filing date: 1969-02-26
Publication date: 1971-08-10
Anticipated expiration: 1988-08-10

Abstract

A power-sanding device has a housing rotatably supporting an elongate drive shaft extending therefrom and rotatably supporting driven shaft portions extending from opposed ends and having a sanding drum mounted on the extending ends thereof. Power means operatively engages the drive shaft to rotate the sanding drums through intermeshing gears on the drive and driven shafts. An elongate arm extends from the housing and has a gripping portion on one end thereof and a guard member mounted on the housing between the gripping portion and a portion of the sanding drums.

Description

United States Patent {72} Inventors Robert L. Choplin 304 N. Delaware, independence, Mo. 64055; Walter D. Hodge, 5237 Delmar, Roeland Park, Kans. [2l] Appl. No. 802,361 [22| Filed Feb. 26, 1969 [45] Patented Aug. l0. 1971 [54) POWERQSANDING DEVICE 6 Claims, 4 Drawing Figs.

[52] U.S.Cl 51/170 PT, 51/372 [5l l Int. Cl B241 23/00 [50] Field of Search 51/170,

[56] References Cited UNITED STATES PATENTS 907,058 12/1908 Kraemer et al. 51/372 3/1933 Clarke 5 l/l 70.1

1,917,303 7/1933 Hope 51/374` 2,076,998 3/1937 Martindale et al 5`l/l70.l` 2,489,102 ll/l949 Moore 51/1 l0.l 2,548,166 3/1951 Larson 5 H374 f 2,749,563 6/1956 Resserm. 5 l/l70.1 2,860,458 11/1958 Raske 51/374 2,687,601 8/1954 Larson 5 l/374 Primary Examiner-William R. Armstrong Alrorney-Fishbum, Gold and Litman ABSTRACT: A power-sanding device has a housing rotatably supporting an elongate drive shaft extending therefrom and rotatably supporting driven shaft portions extending from opposed ends and having a sanding drum mounted on the extending ends thereof. Power means operatively engages the drive shaft to rotate the sanding drums through interrneshing gears on the drive and driven shafts. An elongate arm extends from the housing and has a gripping portion on one end thereof and a guard member mounted on the housing between the gripping portion and a portion of the sanding drums.

'Patented Aug.1o`,197`1- 3,597,883

`2 Sheets-Sheet y1 Im" l 50 i* 4e 4'5 3 MJ V; El; 55 7 s:

5 "i INVENTORS. 57 54 ROBERT L. cHoPLmf..d

o 58 BY WALTER D. HoDaE ez /f 5 0 MM, M if 6 ATTORNEYS Patented Aug. 1o, 1971 I 3,597,883.

2 Sheets-Sheet 2 INVENTORb.

ROBERT L. CHOPLINfna BY WALTER D. HODGE @aa/@mw u m ATTORNEYS POWER-SANDING DEVICE The present invention relates to sanding devices and more particularly to sanding attachments for power tools.

The principal objects of the present invention are: to proe vide a power-sanding device in the form of a power device wherein the sanding device is particularly adapted for sanding curved surfaces, such as boat hulls, vehicle bodies, and the l like; to provide such a power-sanding device which is in the form of an attachment for power tools and is easy to guide and does not rotate around a drive shaft when in use; to provide such a power-sanding device having means for substantially preventing slippage between a periphery of a sanding drum and an abrasive sleeve mounted thereon; to provide such a power-sanding device having a pair of sanding drums spaced with the accompanying drawings wherein are set forthby way of illustration and example certain embodiments of this invention.

FIG. l is a perspective view of a sanding device embodying features of the present invention.

FIG. 2 is an elevational view of the sanding device.

FIG. 3 is a plan view of the sanding device.

FIG. 4 is a transverse sectional view through the sandin device taken on line 4-4, FIG. 3 showing gears for rotating the drums.

Referring more in detail to the drawings:

The reference numeral l generally designates a power-sanding device arranged to be driven by a power tool or motor 2. In the illustrated structure, the motor 2 is in the form of a power drill and the sanding device l is in the form of an attachment for the power tool or drill 2. In the illustrated structure the sanding device l has an elongate housing 3 rotatably supporting an elongate drive shaft 4 extending therefrom and the y housing 3 rotatably supports an elongate driven shaft 5 having sanding drums 6 and 7'mounted on opposite end portions thereof. The motor on power tool 2 is operatively connected to the drive shaft 4 to rotate the

sanding drums

6 and 7 through a gear transmission 9 which in the illustrated structure consists of bevel gears l and Il on the drive and driven

shafts

4 and 5 respectively. An elongate arm l2 extends from the housing 3 and has a gripping portion or handle I3 on a free end thereof and a guard member 14 is mounted on the housing 3 and is positioned between the gripping portion I3 and a portion of each ofthe

sanding drums

6 and 7.

The gear transmission 9 is contained within a gear chamber I within the housing 3. It is, therefore, necessary to provide access to the gear chamber I5 to install or replace the gears l0 and 1l therein. In the illustrated structure, the housing 3 is a split

housing having sections

16 and 17 with one of the sections, as for example section I7, having a guide shoulder I8 thereon and the other section 16 having a mating surface 19 adapted to slidingly engage the guide shoulder 18 whereby the housing sections I6 and I7 telescope together in mating engagement. The sections 16 and I7 are suitably secured together, as by a plurality of machine bolts 20, to close the gear chamber l5 after the gears I0 and Il are mounted on the drive and driven

shafts

4 and 5. In the illustrated structure, the machine bolts 20 are each received in an elongate bore 2l in one of the housing sections, as for example section I7, and threadedly engage a threaded bore 22 in the other housing section I6.

It is preferable that heads of the machine bolts 20 be flush with an exterior surface of the housing section I7, therefore, counterbores 23 are formed in the exterior surface of the housing section 17 at the exterior surface end of the bore 2`I to receive a head portion of respective machine bolts 20.

The housing sections I6 and I7 have elongate alignablc bores 24 and 25 respectively, each positioned to receive and rotatably support portions of the driven shaft 5, as later described. The bores 24 and 25 communicate with the gear chamber l5 having the bevel gears I0 and ll therein, and each has suitable means therein to rotatably support the respective portions of the driven shaft 5, such as antifriction ball bearings, tapered rollers, bushings, and the like. I

In the illustrated structure, the bevel gear ll is suitably fixed, keyed, or pined on an intermediate portion of the driven shaft 5, as by an elongate taper pin 26, and is positioned on the driven shaft 5 to engage the flange of a flanged bushing 27 positioned in the bore 25 in the housing section 17. A sleeve bushing 28 is positioned in the bore 24 in the housing section I6 to cooperate with the flanged bushing 27 to rotatably support portions of the driven shaft 5. Seals 29 are mounted in counterbores 30 and 3l at the exterior surface end of the bores 24 and 25 in the housing sections I6 and 17 respectively. Thrust washers 32 are sleeved on the driven shaft 5 and engage the seals 29 and the exterior surface of the housing sections I6 and I7 adjacent the counterbores 30 and 3l to space the

sanding drums

6 and 7 from the opposite ends of the housing 3 and to provide suitable bearing therebetween.

The drive means, in the form of the power tool 2, is operatively connected loa free end of the drive shaft 4 to rotate the

sanding drums

6 and 7 and in the illustrated embodiment of the present invention, the drive shaft 4 is transverse to the driven shaft 5.and it is necessary to guide and rotatably support the drive shaft 4, therefore, an upper portion of the housing 3 has a threaded bore 33 intermediate the ends thereof and is adapted to receive a threaded end portion 34 of an elongate shaft guide member 3S having the drive shaft 4 rotatably supported therein. The shaft guide member 35 has an elongate internal bore 36 having suitable means therein to guide and rotatably support the drive shaft 4, such as antifriction ball bearings, tapered rollers, bushings and the like. In the illustrated structure,

counterbores

37 and 38 are formed at opposite ends of the shaft guide member 35 to seat a flange portion of flanged

bushings

39 and 40 respectively which are mounted in the bore 36 to receive and support the drive shaft 4. One of the counterbores, as for example counterbore 37, is in the threaded end portion 34 and is sized to receive a portion of the bevel gear l0 which is suitably fixed, keyed or pined on the drive shaft 4, as by an elongate taper pin 4I, at the other end thereof. A collar 42 is sleeved on the drive shaft 4 and is suitably secured thereon intermediate the ends thereof as by an elongate taper pin 43, in a position to engage the flange portion of the flanged bushing 40 seated in the other counterbore 38, to thereby guide the drive shaft 4 and maintain same within the shaft guide member 35 during rotation thereof It is desirable to space the gripping portion or handle I3 from the exterior surface of the

sanding drums

6 and 7 to prevent injury to a person (not shown) using the sanding device l. In the illustrated structure the shaft guide member 35 has a shoulder 44 onvthe exterior surface thereof adjacent the threaded end portion 34 to receive and support a handle assembly 45. An elongate split sleeve portion 46 of the handle assembly 45 is removably mounted on the exterior surface of the shaft guide member 35 and one end thereof engages or seats on the shoulder 44. The arm l2 is part of the handle assembly 45 and is illustrated as a pair of

bars

47 and 48 extending radially from the split sleeve portion 46 and has the gripping or handle portion 13 mounted on the free ends thereof. The

bars

47 and 48 are transversely spaced and suitably secured to the split sleeve portion 46 on adjacent sides of a split or slot 49 extending between opposite ends thereof whereby a suitable fastening device, such as a machine bolt or screw 50 which is mounted in the

bars

47 and 48 in a manner similar to the machine bolts 20 thereby being adapted to tighten the split sleeve portion 46 into clamping engagement with the exterior surface of the shaft guide member 35.

The guard member I4 is positioned between the handle I3 and the

sanding drums

6 and 7 and the guard member I4 is formed of a pair of sections 5l and 52 suitably secured to the split sleeve portion 46 adjacent the split or slot 49 therein, as by welding, and extends therefrom and the guard sections are of a suitable arcuate shape to cover a portion of the

sanding drums

6 and 7 respectively to protect the hand (not shown) of a person (not shown) gripping or holding the handle portion 13 of the sanding device l.

The guard member 14 is sized to cover only a small portion of the

sanding drums

6 and 7 whereby the power-sanding device is particularly maneuverable to engage curving surfaces, such as boat hulls.

lt is desirable that the power-sanding device l be a compact structure and that the

sanding drums

6 and 7 be as close together as reasonably possible so that the sanding effort can be concentrated in a desired area of a surface being treated. Therefore, the sanding drums are tubular members adapted to be in an overlying and surrounding relation with end portions of the elongate housing 3.

ln the illustrated structure, the

sanding drums

6 and 7 are each formed of an elongate drum or core portion 53 having a hub portion 54 centered therein and suitably fixed, keyed or pined on the respective end portions of the driven shaft S, as by an elongate pin 55. The core portion S3 is illustrated as an elongate tubular cylindrical member having a recess or opening in each end thereof each of which tapers from the opposite ends toward the hub portion 54 thereby being adapted to be positioned in a covering and surrounding relation with tapered end portions 56 of the

respective housing sections

16 and 17.

lt is preferable to have the periphery ofthe

sanding drums

6 and 7 formed of a resilient material, such as soft rubber, neoprene or the like, and to have the mounting portion or hub portion 54 fonned of a relatively rigid material, such as hard rubber, metal or the like. 1n the illustrated structure, the core portion 53 is a separate member, preferably of metal, and the exterior surface of the core portion 53 is preferably left in a roughened condition or roughened after forming whereby a resilient rim 57, preferably of rubber, may be bonded thereto. The resilient rim 57 has a plurality of circumferentially spaced cuts 58 extending longitudinally along the periphery thereof.

The cuts 58 are each inclined relative to a radial plane 59 through a root 60 of each of the cuts 58 with the incline being outwardly from the plane 59 toward the direction of operational rotation of the

drums

6 and 7 and the incline is in the nature of to 30 from the plane S9 whereby the diameter of the resilient rim 57 may be reduced by grasping the periphery thereof while at rest and twisting same toward the direction of operational rotation which is in the same direction as the incline of the cuts 58. The resilient rim 57 is thereby prepared to receive an elongate generally cylindrical sleeve member 61 having an abrasive exterior surface, such as sandpaper. The incline of the cuts 58 is also such that during operational rotation of the

sanding drums

6 and 7, as indicated by arrow 62, the periphery of the resilient rim 57 will increase or be extended or enlarged to provide a firm engagement with the interior surface of the sleeve member 61 substantially preventing slippage therebetween to thereby maintain the abrasive sleeve 6l on the resilient rim 57 during use of the sanding device l.

1n use, the bevel gears l0 and ll are mounted on the drive and driven

shafts

4 and 5 by the taper pins 41 and 26 respectively. The sleeve bushing 28 is positioned in the bore 24 and the flanged bushing 27 is positioned in the bore 25. The

housing sections

16 and 17 are sleeved on opposite ends of the driven shaft 5 and then are secured together by the machine bolts 20. The hub portions 54 are secured to the opposite end portions ofthe driven shaft 5 by the pins 55. The periphery of each resilient rim 57 is grasped and twisted in the direction of operational rotation` as indicated by arrow 62, to reduce the diameter thereof to receive the sleeve member 61 thereon. The

flanged bushings

39 and 40 are seated in the counterbores 37 :ind 38 of the bore 36 and the drive shaft 4 is inserted through the

bushings

39 and 40 in the guide member 35 which is then mounted in the threaded bore 33 with the bevel gears l0 and l1 in intermeshing engagement. The handle assembly 45 is then mounted on the guide member 35 and a chuck 63 of the power tool 2 is operatively connected to the free end of the drive shaft 4 to rotate

thc sanding drums

6 and 7. The power tool 2 and the handle 13 are grasped or held by a person (not shown) to guide the sand device l during use.

With the sanding

drums

6 and 7 being mounted on opposite ends of the driven shaft 5, they both rotate in the same direction and at the same speed whereby thc sanding device l does not rotate around the drive shaft 4 when

thc sanding drums

6 and 7 are both in engagement with a surface (not shown) being sanded or treated.

The sanding device l is also adapted to be used as a polisher by placing a sleeve member having an exterior buffing surface of soft material, such as cloth, on the resilient rim 57 of each

drum

6 and 7.

lt is to be understood that while l have illustrated and described one form of my invention it is not to be limited to this specific form or arrangement of parts` herein described and shown.

What we claim and desire to secure by Letters Patent is:

l. A power-sanding device comprising:

a. a housing having an elongate drive shaft rotatably supported therein;

b. an elongate driven shaft rotatably supported in said housing, said driven shaft having opposite ends thereof ex tending from said housing transversely to said drive shaft;

c. said housing including a pair of elongate end sections each having a bore through one end thereof, said bores being alignable to rotatably support said driven shaft, said end sections each having mating means on the other ends thereof for aligning said bores;

d. means for securing said end sections together with said bores aligned;

. a threaded bore in said housing disposed transverse to said driven shaft;

. an elongate drive shaft guide member having one end threaded for mounting in said threaded bore, said guide member having said drive shaft rotatably supported therein;

. an elongate arm extending from said housing;

. a gripping portion on one end of said arm for guiding the sanding device;

. gears within said housing operatively connecting said drive and driven shafts;

j. an elongate sanding drum mounted on each end of said drive shaft;

k. power means operatively connected to said drive shaft to rotate same and said sanding drums.

2. The power sanding device as set forth in claim l includa. a split sleeve mounted on said guide member and having said arm extending therefrom; and

b. a split guard member on said split sleeve, said guard member being positioned between said gripping portion and a portion of each of said sanding drums.

3. A power-sanding device comprising:

aA an elongate housing having a pair of elongate end sections each having a bore through one end thereof, said end sections each having means on the other ends thereof for aligning said bores, said housing having a threaded bore disposed transverse to said aligned bores;

b. an elongate guide member having one end threaded for mounting in said threaded bore for rotatably supporting an elongate drive shaft;

cA an elongate driven shaft rotatably supported in said aligned bores and having opposite ends thereofextending from said housing transversely to said drive shaft;

dA first and second intermeshing bevel gears within said housing, said first bevel gear being on one end of said drive shaft and said second bevel gear being on said driven shaft intermediate the ends thereof;

e. an elongate sanding drum mounted on each end of said driven shaft` said drum having an abrasive exterior surface;

f. power means operatively connected to the other end of said drive shaft to rotate same and said sanding drums; and

g. means for guiding said sanding drums.

4. The power-sanding device as set forth in claim 3 wherein said sanding drums each include:

a. a core member having a generally cylindrical exterior surv c. an elongate generally cylindrical sleeve removably mounted on said resilient rim, said sleeve having said abrasive exterior surface thereon.

5. A portable power-sanding device comprising:

a. a housing having a pair of elongate end sections said end sections each having a bore therein aligned with the other;

b. a driven shaft rotatably supported in said bores and having an end extending from a housing end section;

c. a drive shaft;

including:

d. an elongate drive shaft guide member removably supported by said housing, said guide member having a bore transversely of the driven shaft, said drive shaft being rotatably supported in said bore of said guide member and having one end extending therefrom;

e. a power tool including a drill chuck attached to said one end ofthe drive shaft and operative to rotate same;

f. gears within said housing operatively connecting said drive and driven shafts;

g. an elongate sanding drum mounted on said extending end of the driven shaft and rotated in response to rotation of the drive shaft, said sanding drum having a resilient rim portion; l

h. a sanding sleeve having an abrasive exterior surface removably mounted on said resilient rim and frictionally retained thereon;

i. an arm secured relative to the housing and extending therefrom substantially in a plane through the drive shaft and transversely of the driven shaft;

j. a gripping handle on said arm for facilitating guiding of the sanding device.

6. A portable power-sanding device as set forth in claim 5 a. said gripping handle extending laterally of said arm sub` stantially parallel to the driven shaft and spaced from the sanding drum;

b. a guard member fixed on said arm and positioned between the gripping handle and the sanding drum to protect an operators hand from engagement with the sanding drum.

Claims

1. A power-sanding device comprising: a. a housing having an elongate drive shaft rotatably supported therein; b. an elongate driven shaft rotatably supported in said housing, said driven shaft having opposite ends thereof extending from said housing transversely to said drive shaft; c. said housing including a pair of elongate end sections each having a bore through one end thereof, said bores being alignable to rotatably support said driven shaft, said end sections each having mating means on the other ends thereof for aligning said bores; d. means for securing said end sections together with said bores aligned; e. a threaded bore in said housing disposed transverse to said driven shaft; f. an elongate drive shaft guide member having one end threaded for moUnting in said threaded bore, said guide member having said drive shaft rotatably supported therein; g. an elongate arm extending from said housing; h. a gripping portion on one end of said arm for guiding the sanding device; i. gears within said housing operatively connecting said drive and driven shafts; j. an elongate sanding drum mounted on each end of said drive shaft; k. power means operatively connected to said drive shaft to rotate same and said sanding drums.

2. The power sanding device as set forth in claim 1 including: a. a split sleeve mounted on said guide member and having said arm extending therefrom; and b. a split guard member on said split sleeve, said guard member being positioned between said gripping portion and a portion of each of said sanding drums.

3. A power-sanding device comprising: a. an elongate housing having a pair of elongate end sections each having a bore through one end thereof, said end sections each having means on the other ends thereof for aligning said bores, said housing having a threaded bore disposed transverse to said aligned bores; b. an elongate guide member having one end threaded for mounting in said threaded bore for rotatably supporting an elongate drive shaft; c. an elongate driven shaft rotatably supported in said aligned bores and having opposite ends thereof extending from said housing transversely to said drive shaft; d. first and second intermeshing bevel gears within said housing, said first bevel gear being on one end of said drive shaft and said second bevel gear being on said driven shaft intermediate the ends thereof; e. an elongate sanding drum mounted on each end of said driven shaft, said drum having an abrasive exterior surface; f. power means operatively connected to the other end of said drive shaft to rotate same and said sanding drums; and g. means for guiding said sanding drums.

4. The power-sanding device as set forth in claim 3 wherein said sanding drums each include: a. a core member having a generally cylindrical exterior surface; b. a resilient rim mounted on said cylindrical exterior surface, said rim having a plurality of circumferentially spaced cuts each extending longitudinally along the periphery thereof, said cuts each being inclined outwardly toward the direction of rotation relative to a radial plane through their respective root whereby operational rotation of said rim increases the diameter thereof and twisting the periphery of said resilient rim while at rest toward the direction of operational rotation reduces the diameter thereof; and c. an elongate generally cylindrical sleeve removably mounted on said resilient rim, said sleeve having said abrasive exterior surface thereon.

5. A portable power-sanding device comprising: a. a housing having a pair of elongate end sections said end sections each having a bore therein aligned with the other; b. a driven shaft rotatably supported in said bores and having an end extending from a housing end section; c. a drive shaft; d. an elongate drive shaft guide member removably supported by said housing, said guide member having a bore transversely of the driven shaft, said drive shaft being rotatably supported in said bore of said guide member and having one end extending therefrom; e. a power tool including a drill chuck attached to said one end of the drive shaft and operative to rotate same; f. gears within said housing operatively connecting said drive and driven shafts; g. an elongate sanding drum mounted on said extending end of the driven shaft and rotated in response to rotation of the drive shaft, said sanding drum having a resilient rim portion; h. a sanding sleeve having an abrasive exterior surface removably mounted on said resilient rim and frictionally retained thereon; i. an arm secured relative to the housing and extending therefrom substantially in a plane through the drive shaft and traNsversely of the driven shaft; j. a gripping handle on said arm for facilitating guiding of the sanding device.

6. A portable power-sanding device as set forth in claim 5 including: a. said gripping handle extending laterally of said arm substantially parallel to the driven shaft and spaced from the sanding drum; b. a guard member fixed on said arm and positioned between the gripping handle and the sanding drum to protect an operator''s hand from engagement with the sanding drum.