US1969318A - Ventilated sanderplane - Google Patents

Description

8- 1934- H. L. MYERS 1 969318 VENTILATED SANDBRPLANE Filed July 27, 1933 3 Sheets-Shet I {j .Jzryl er 1 a v Buggy I -'7, 1934. H. L, MYERS 1,969,318

VENTILATED SANDERPLANE Filed July 27, 1933 1 11191.1 I 1 9 III/11111220,, I,

1934- H. L. MYERS 1,969,318

VENTILATED SANDERPLANE Filed July 27, 1933 3 Sheets-Sheet 5 Inventor Barry .5. ){yers flllorney Patented Aug. 7, 1934 PATENT OFFICE 1,969,318 VENTILATED SANDERPLANE Barry L. Myers,

Toledo, Ohio, assignor to The American Floor Surfacing Machine Company,

Toledo, Ohio, a corporation of Ohio Application July 2'1, 1933, Serial No. 682,502

12 Claims.

The present invention relates to that category of portable hand sanding and abrading machines now currently utilized for finishing surfaces of tables, desks, doors, floors, walls and the like, which style and type of machine is now generally referred to in the trade and industry as a bench-type sanderplane.

Lightweight high-speed sanderplanes of the variety alluded to have acquired a definite status in the art and trade asdistinguished from heavy and cumbersome floor finishing machines such as are utilized for heavy duty work and more laborious tasks.

Briefly stated, the inventive conception comprehends the provision of a longitudinally elongated chassis frame equipped with a horizontally disposed motor and casing assembly, together with endless belt abrading means and a suitable dust collecting system.

The majority of sanderplanes of this species have the dustcollecting duct or intake nozzle in close proximity to the rear belt driving roller and are generally equipped in this same region with suitable supporting means such as a horizontally disposed roller or the like calculated to aid in the handling and manipulating of the machine on the bench.

In perfecting the principle and preferred embodiment of the invention, I have discovered that the rear supporting means can be entirely dispensed with in order to provide a more practical type machine whose features of accommodation and adaptation transcend those of similar patented and marketed bench sanding machines and sanderplanes.

As implied by the foregoing assertions, one feature of the improved sanderplane is predicated upon an arrangement which is mechanically correct, scientifically designed, systematically balanced, and characterized by special co-ordination and selection of features conducive to safe and sensitive operation wherein the aforesaid rear supporting means is eliminated in order to prevent the rear ,end portion of the machine from tipping back and gouging into the surface being abraded.

I As an innovation, I have embodied in this improved machine, a special co-ordinated air circulating and suction system whose features have been ingeniously arranged and centralized to render them aptly fitted to the task of providing means for picking up and bagging the dust and simultaneously aerating and cooling the motor through the instrumentality of. a dependable ventilating fan assembly.

springs so arranged rigidly attached As will be evident as the description proceeds, additional novelty is thought toreside in the adoption and special adaptation of an oscillatory hingedly attached backing plate or shoe for the working flight of the belt, wherein said 80 shoe is in the form of a substantially rigid, that is, flexure resisting plate, hingedly mounted at a point intermediate its longitudinal dimension and equipped with a plurality of with respect to the pivotal B5 mounting as to allow the entire superstructure, that is, the frame and casing, to be tilted back and forth while the shoe rests substantially fiat on the work. Under this arrangement, the shoe accommodates the frame and under certain conditions the frame accommodates the shoe depending upon the job at hand.

Stated more explicitly, an additional feature and advantage flows from the use of spaced parallel vertically superposed plates one being to the frame and constituting an adapter plate and the lower plate hingedly attached to said adapter plate intermediate its ends with springs interposed between said plates to provide a novel resilient shoe arrangement for maintaining requisite resilient pressure on the lower flight of the belt. Then too, the pivotally mounted springpressed shoe is co-ordinated to co-operate with the spring-pressed idling roller associated with the frontal portion of the belt in an unusual way so-that the two features, that is the shoe and the spring-pressed carrier for the front roller co-act to promote more efficient and satisfactory results.

Other features and advantages which render the machine satisfactorily machineable and which adapt it for unqualified endorsement by the thrade will become more readily apparent from the following description and drawings.

In the drawings:

Figure 1 is a side elevational view of 'a sanderplane of the ventilated type constructed in ac,- cordance with the principles of the present inventive conception.

Figure 2 is a longitudinal sectional view partly in elevation, disclosing the complete ensemble and allocation of parts.

Figures 3 and 4 are exaggerated transverse or cross sectional views taken approximately on the planes of the lines 3-3 and 4-4 respectively, of Figure '1.

Figure 5 is a marginal edge elevational viewof the duplex fan unit.

Figure 6 is a fragngentary sectional view structure disclosing'the superposed adapted plate and shoe ensemble.

As before indicated, the improved machine comprises a suitable chassis or frame denoted by the numeral 7. Suitably attached to and supported on this frame is the horizontally disposed, longitudinally elongated power unit and its accessories denoted by the numeral 8. The principal part of this unit 8 may be referred to as a casing and this embodies several distinct parts, namely a housing 9 for the motor 10, a detachable cap 11, and a separable closure for the rear end of the motor housing.

This closure is constructed to provide an enclosure 12 for the driven shaft and power transmitting gearing. The driven shaft 13 is supported in appropriate bearings and equipped with a bevelled gear 14 operable through the instrumentality of a pinion 15' on the rear end of the motor shaft 16. The motor shaft is journalled for rotation in appropriate bearings 17 and 18 respectively. This bevel gear drive constitutes a positive and dependable power supply means in a machine of this style as contrasted with the customary worm gear drive ordinarily employed.

Referring now to the aforementioned cap 11, it will be observed that this is provided with a suitable stabilizing hand knob 19 and an arrangement of air inlet holes 20 for ventilating and cooling the motor 10.

The closure unit at the rear of the casing is formulated with a dust intake duct 21 whose curved pendent portion is properly located with respect to the work surface to introduce the dust.

This dust intake duct 21 communicates at its inner end with a centralized fan chamber 22 which chamber is located intermediate the ends of the casing 8 and fashioned into two compartments to accommodate a duplex or double-acting fan 23. The fan is mounted on the central portion of the motor shaft 16, that is, between the motor and the gearing. Incidentally, the numeral 24 designates a discharge neck communicating with the chamber 22 and adapted to accommodate the dust collection bag 25.

The fan 23, as detailed in Figure 5, comprises a. disc 26 on one, side of which are vanes or blades 27 tied together by an annulus or web 28. These vanes form a suction fan for drawing in the dust through the duct 21 into the chamber 22 and blowing it out into the bag byway of the attaching neck 24. On the other side of the disc 26 are somewhat smaller vanes or blades 29 also interconnected through the instrumentality of an annular web 30. These vanes constitute a motor cooling fan to draw the air in through the air inlets 20 in the cap against the motor 10 and discharge the air into the surrounding compartment 31 which is provided as shown in Figure 4 with air discharge ports 20a.

Particular stress and importance is attached to this duplex centralized fan assembly for simultaneously ventilating the motor 10 by way of the air inlets 20 and outlets 20a and collecting and bagging the work dust by way of the duct 21 and dust compartment of the fan chamber 22. The fan is common to both the circulatory motor cooling air and dust-collecting system.

Special observance should be accorded the double-acting fan and its accommodation chamber assembly. For example, it will be noticed that this chamber 22 is actually divided by the disc 26 of the fan into two distinct compartments, the compartment to the right in Figure 2 being in communication with the dust intake duct 21, and the compartment to the left being in open communication with the air outlets 20a as well as the air inlets 20.

The disc portion of the fan has a running fit in the central portion of the chamber so that the two compartments are actually separated from each other in the sense that they do not communicate. Consequently, the dust which is drawn in is prevented from getting into the motor space of the casing.

Attention is now invited to the surface abrading means and its accessories which, as arranged, possess a definite compensating relationship tothe centralized fan arrangement as regards systematic balance and equilibrium designed to render the machine easily and conveniently manipulatable.

.The means comprises an endless abrading belt '32 trained over longitudinally spaced front and rear rollers 33 and 34 respectively. The front roller is an and the rear roller is operatively connected with the aforesaid gearing to drivethe belt. This general 'roller and belt arrangement is old in the art. l

It will'be observed, however, that the front roller is supported on a spring-pressed beltidling roller as is customary 40 to a rectangular adapter plate 391; rigidly carried by the cylinder 37 as shown better in Figure 8. Retention and cushioning springs 41 are connected with the two plates 39 and 39a to and located in pairs on opposite sides of the pivotal connections 40 in alinement with said pivotal connections. This provides a sort of an oscillating belt presser shoe or platen. Such an arrangement is regarded as desirable in view "of the fact that in the present machine, as be-- fore stated, there is no roller or leg or other supporting means at the rear end of the machine as is generally utilized in sanderplanes of this special type.

This type machine is can be set flat on the perfectly balanced and work and operated exactly the same as a hand plane. By elimination of the supporting means at the rear of the machine, one is permitted to draw the machine back over" the edge of the surface, such as a table. without danger -of the machine rocking back when the supporting cluded in this machine) is hanging over the edge of the surface being treated and permitmeans (not inis notperfectly balanced as in to provide. ;a snDPO. ti-I.

emwh ne to rntevent.- the sanding shoe 39 from gouging-into-the-sur:

- r vantages;theaexnlicit constm t n, As an added feature,. I provide a-suitable;

' naeaaia ting the sanding belt ,to; chamfer the-sharp edge, while the supporting means (not shown). isout of contact with the surface feature is very important. and; the machine:

this case;- ?v

absolutely necessary means at the rear of face being treated.-

hand-grip 42 attachable to the rear part; 10f; the casing and having. .a brace 43 secured to the depending portion of the dust intake duct 21. It is thought that continuity of operation and purpose is found in the provision of a sanderplane of .this type characterized by the frame 7 provided with the centrally pivoted oscillatory backing plate or shoe 39 and equalizing and compensating spring means 41 affording the desired resilient characteristics for said shoe; taken in conjunction with the springpressed carrier. unit co-ordinated with the belt 32 and automatically operable in conmachines rangement junction with the spring-pressed shoe 39 as the operator moves the plane back and forth exerting pressure either forwardly downward or rearwardly downward at either end, as conditions require. In other words, the springpressed feature 35, though it is old in similar in the art, combines with the features 39, 40 and 41, in adding to the practicability of these features by rendering the machine more easily manipulatable for sensitive bench work.

Then too, by centralizing the duplex fan arrangement, a more satisfactory balance and equilibrium is attained to permit this sensitive manipulation of the plane to be accomplished. In other words, by omitting the customarily used rear supporting means (not shown) and centralizing the fan and dust bag arrangement, stress and strain is distributed and equalized and the entire weight of the machine uniformly balanced to promote more efficient and dependable usage. Particularly do I wish to emphasize the duplex 'fan arrangement which is common to both themotor aerating and dust collecting means. Novelty is therefore thought to reside in the provision of an appropriate frame having suitable surfacing means and horizontally elongated casto accommodate the motor shaft wherein said motor shaft is provided with a duplex centrally arranged fan that is located between the motor and gearing and wherein the motor cooling air and dust collecting suction is delivered to the center of the machine and exhausted through the centralized outlet 24 and ports 20a respectively.

In conclusion, it will be noted that the machine definitely characterized by two salient improvements. First, the double-compartment fan chamber and the duplex fan located therein and mounted on the central portion of the motor shaft and the co-ordinated bag attaching neck disposes this part of the invention'at the center of the casing avoiding overhanging rear accessories and weight at the rear portion of the machine and distributing the strain and weight to provide for more effective balance and handling. -.;,Second1y, the frame, casing, motor, and other parts, are practically supported solely by the underfiight of the belt, through the instrumentality of said belt bearing against the oscillatory spring-retained backing plate or shoe, thisarbeing co-ordinated with the springbeingtreated:;

ing provided with a longitudinally spaced bearing;

pressed compsnfiati gmeans for the front roller, and therefore obviatingz the nece y f P d-.

ing special-rear-supporting rollers or equivalent devices atjtheinner-oryi'ear endof the machine.

.-A careful. consideration of. the foregoing description; in --.coniunction with the illustrative drawings will enable the reader to obtain a clear understanding of-the purpose, features and adandthe inventi0n;.;-as hereinafter planned.

It is to be understoodthat ;minor changes in hapacs seirelative.nroportionsgand materials may be resorted to in practice without departing from the spirit of the invention or the scope of the invention as now claimed. I

I claim:

1. A portable hand abrading machine of the type described including a frame, spaced apart rollers carried by the frame and extending transversely thereof, an abrading belt movable over the rollers, the frame above said belt embodying a longitudinally elongated casing extending lengthwise of the belt, said casing embodying longitudinally spaced bearings, being formed at its forward end with a motor compartment having air inlets, formed atits rear end with a gear compartment, and formed at its central portion with a suction fan chamber, the rear' portion of the casing being further formed with a dust intake duct leading upwardly'and forwardly into the central fan chamber, a motor located in the motor compartment and embodying a shaft journalled for rotation in said bearings, the rear end of the shaft being located in the gear housing, and a fan attached to the central portion of the shaft and located in said suction chamber.

2. A portable hand abrading machine of the type described including a frame, spaced apart rollers carried by the frame, and extending transversely thereof, an abrading belt movable over the rollers, the frame above said belt embodying a longitudinally elongated casing extending lengthwise of the belt, said casing embodying longitudinally spaced bearings, being former at its forward end with a motor com partment having air inlets, formed at its rear end with a gear compartment, and formed at its central portion with a suction fan chamber, the rear portion of the casing being further formed with a dust intake duct leading upwardly and forwardly into the central fan chamber, a motor located in the motor compartment and embody ing a shaft journalled for rotation in said bearings, the rear end of the shaft being located in the gear housing, and a fan attached to the central portion of the shaft and located insaid suction chamber, said fan being of a'duplex type and including a central disc dividing said suction chamber into individual compartments, one compartment being in communication with the dust intake duct, the other compartment being in communication with the air inlets and having its wall formd with air-outlets.

3. A machine of the class described comprising a frame, front and rear longitudinally spaced abrading belt rollers-mounted for rotation on said frame, an endless abrading belt trained over said rollers, alongitudinally' elongated horizontally disposed casing supported on said frame and provided at one end with an apertured air inlet cap and at its opposite end with a closure embodying a gear housing and a dust intake duct, the entrance portion of said duct being located within close proximity of the rear roller and adjacent portion of the belt, said casing being provided with longitudinally spaced bearings, the central portion of the casing being formed with air outlet openings, a dust bag attaching neck and a duplex fan chamber coordinated therewith, a motor located in said casing and having a shaft journalled for rotation in said bearings, bevel gearing located in said gear housing, said motor shaft being pro vided with a pinion co-operating with said gearing, a double-acting fan attached to and rotatable with the central portion of said motor shaft and located in said fan chamber, said fan being provided on opposite sides with vanes, the vanes on one side serving to suck dust into the dust intake duct and the vanes on the opposite side serving to draw cooling air in through the apertures of said cap for cooling said motor.

4. A sanderplane of the class described comprising a longitudinally elongated frame, front and rear transversely arranged belt rollers mounted for rotation at opposite ends of said frame, an endless abrading belt trained over said rollers, a presser shoe comprising a backing plate, said backing plate being pivotally attached to the,frame at points intermediate its ends, the plate being longitudinally elongated and in contact with the.inner surface of the lower flight of the belt, spring cushioning means associated with the end portions of the plate on opposite sides of the pivotal connection, said plate forming the sole supporting means for the frame on the work, a motor casing embodied in said frame and including a motor operatively connected with one of the aforesaid rollers, said motor casing including a centralized fan chamber arranged directly above the pivotal mounting of said shoe, said motor including a shaft extending through said fan compartment, and a fan on said shaft located in the compartment.

5. In a structure of the class described, a frame having a base portion including a hori zontal longitudinally extending cylinder, a coil spring in said cylinder, a roller carrier unit including a stem slidable in said cylinder and cooperating with said spring, a transversely disposed roller mounted for rotation on said unit,

a fixedly mounted operating roller mounted on the frame and spaced longitudinally from said first-named roller, said cylinder being provided with a horizontal adapter plate formed integral therewith, a backing plate hingedly attached between its ends to said adapter plate, a plurality of springs interposed between said plates, and an endless abrading belt trained over said rollers and backing plate.

6. A sanderplane of the class described comprising a self-contained motor-equipped frame, a motor driven roller on the rear portion of said frame, a quick-detachable spring-pressed carrier unit mounted on the frontal portion of the frame and including an idling roller, said rollers being spaced longitudinally on said frame, an endless abrading belt trained over said rollers, a flexible backing plate engageable with the inner surfaceof the lower flight of the belt, means rockably connecting the intermediate portion of the plate with said frame, and front and rear sets of coil springs located on opposite sides of the rockable connection and interposed between the corner portions of the plate and adjacent superposed portions of said frame, saidspringsserving to balance the plates, render it self-adjusting and to coordinate its and having its lower flexible properties with the automatic compensating action of the spring-pressed unit and front roller.

7. A portable bench sanderplane of .the type with a suction-fan chamber, the rear portion of the casing being formed with a dust intake and delivery duct leading upwardly from the rear end of said belt and forwardly into said fan chamber, a motor located in the motor compartment and operatively connected with the belt, and a fan located in said suction fan chamber and operatively connected with said motor, said fan being of a duplex type and including a central disk having a marginal running fit with respect tov the surrounding peripheral wall portion and dividing the suction chamber into individual non-communicating compartments, one compartment being in communication with the dust intake duct, the other compartment being in communication with the air inlets and motor compartment and the wall thereof being formed with air discharge openings.

8. A portable bench sanderplane of the class described embodying a frame, spaced apart rollers carried by the frame and extending transversely of the end portions. thereof, an endless abrading belt movable over the rollers, the frame above said belt embodying a longitudinally elongated casing extending lengthwise of the frame and belt, said casing embodying longitudinally spaced bearings, the casing being formed at its central portion with a suction fan chamber, the rear portion of the casing being formed with a dust intakeduct leading upwardly and forwardly from the rear end portion of the belt into said fan chamber, the casing -being formed at its forward end in advance of said fan chamber with a motor compartment, the rear portion of the casing being formed with a gear compartment, a motor located in the motor compartment and embodying a shaft journaled for rotation in said bearings, the rear end of the shaft being located in the gear housing, a, fan attached to the central portion of the shaft and located in said suction chamber, said suction chamber being provided at its top with a dust discharge neck, and a dust bag connected with said neck.

9. In a structure of the class described, a frame having a base portion including an underlying longitudinally elongated cylinder, a coiled spring in said cylinder, a roller carrier unit including a stem slidable in said cylinder and pressing against said spring, a transversely disposed roller mounted-for rotation on said unit, a fixedly mounted operating roller mounted on the frame and spaced longitudinally from said roller, a resilient backing plate 'hingedly supportedbetween its ends from said cylinder, a plurality of coil springs interposed between the cylinder and backing plate and located on opposite sides of the hinged connections, and an endless abrading belt trained over said rollers flight in contact with said backing plate.

10. A portable hand controlled surfacing machine of the type described including a frame,

spaced apart rollers carried by the frame and extending transversely thereof, an abrading belt trained over said rollers, a backing plate rockably supported on the frame between said rollers and embodying automatic spring control means, the lower flight of said belt in conjunction with said plate constituting the sole supporting means for the frame, the upper portion of said frame embodying an enclosure of longitudinally elongated design divided into axially alined independent compartments, there being a gear compartment at the rear end portion of the frame, a motor compartment at the forward end portion and a fan compartment between said gear compartment and motor compartment, said fan compartment being disposed substantially above the central portion of said backing plate and equipped with means to accommodate a dust collecting bag, a motor in said motor compartment, gearing in said gearing compartment, said motor including a shaft extending through said fan compartment, and a fan on that portion of the shaft located in said fan compartment.

. 11. A portable hand abrading machineof .the type described embodying a frame, endless belt abrading means carried by the lower portion of said frame in a position to conveniently contact the work, the frame above said abrading means embodying a horizontally disposed longitudinally elongated enclosure formed at its forward end with a motor compartment having air inlets, formed at its rear end with a gear compartment, and formed between said compartments and at its central portion with a suction fan chamber, the rear end portion of said enclosure being further formed with a dust intake duct leading upwardly and forwardly into the central fan chamber, a motor located in the mo tor compartment and embodying a rotatably supported shaft, the rear end portion of the shaft being located in the gear compartment type described comprising a support, an endless abrading belt operating and supporting 'means therefor carried by said support, said support having its upper portion provided with a longitudinally elongated casing extending lengthwise with respect to the belt, said casing embodying longitudinally spaced bearings, being formed at its forward end with a motor compartment having air inlets, formed at its rear end with a gear compartment, and formed between said motor compartment and gear compartment with a centrally located suction fan chamber, the rear portion of the support including a dust intake duct leading upwardly from the rear end of the belt and forwardly into communicating relationship with the centralized fan chamber, a motor located in the motor compartment and embodying a shaft journalled for rotation in said bearings, the rear end of said shaft being located in said gear compartment, gearing in said compartment with which said shaft cooperates, the central portion of said shaft extending through said fan chamber, and a fan attached to the central portion of the shaft and located in said chamber, said fan being of a double acting type and including a central disk whose marginal portion is disposed in running fit relationship with respect to the surrounding wall portion of the fan chamber to divide said chamber into non-communicating separate forward and rear portions, the rear portion being in communi-

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