US2143970A

US2143970A - Sanding machine

Info

Publication number: US2143970A
Application number: US213812A
Authority: US
Inventors: Perley T Blood
Original assignee: WILLIAM A BOWER
Current assignee: WILLIAM A BOWER
Priority date: 1938-06-15
Filing date: 1938-06-15
Publication date: 1939-01-17
Anticipated expiration: 1956-01-17

Description

Jan. 17, 1939. R {BLOOD 2,143,970

SANDING MACHINE Filed June 15, 1958 2 Sheets-Sheet l PERLEY T. BLOOD Jnnentog (Ittorneg Jan. 17, 1939. P. T. BLOOD 2,143,970

SANDING MACHINE Filed June 15, 1938 2 Sheets- Sheet 2 PER LEY T. aLdoo 3nvcntor (Ittomeg Patented Jan. 17, 1939- Perley one-half to William A.

6 Claims. I

My present invention relates to an improved sanding machine of the portable, rotary disc type, and electrically operated for finishing, refinishing, and otherwise treating floors, floorsurfaces, and the like. The primary object of the invention is the provision of a portable, manually propelled and controlled electrically operated tool of this character that is simple in construction and operation; composed of a minimum number of compactly arranged parts that are readily accessible for replacements and repairs; and because of the small space occupied by the compactlyarranged machine or tool the latter may with facility work in corners and other if) restricted spaces that are ordinarily inaccessible.

In, carrying out my invention I employ a powerrotor or unit, as the armature and shaft of an electric motor, upon which the rotary disk of the machine is directly mounted, and means are provided whereby the rotary power unit may be slightly depressed to vary the pressure of the disk upon the floor, and in addition means are provided whereby a compound movement may be imparted to the rotary disk in order to adaptthe working face of the rotary disk to any irregu1arities in the surface being treated.

The invention consists in certain; novel combinations and arrangements of parts for accomplishing the above objects as will hereinafter be more fully set forth and claimed. In the accompanying drawings I have illustrated one complete example of the physical embodiment of my invention wherein the parts are combined and arranged in accord with the best mode I have thus far devised for the practical application of the principles of my invention.

Figure l is a view in side elevation showing the sanding machine in position for use.

Figure 2 is a. bottomplan view of the machine on a reduced scale.

Figure 3 is a vertical sectional detail view transversely through the machine.

Figure 4 is a detail top plan view of the bearinghead and part of the brace-arm of the machine or Figure 5 is a bottom plan view of the fan or blower employed to convey dust from the machine to a dust-bag.

Figure 6 is an enlarged detail vertical sectional view showing part of the base or housing of the machine, and particularly the deformable, flexible, resilient, annular cushion or paid on which themotor is mounted, together with the resilient diaphragm at the bottom of the motor casing.

55 Figure 7 is a detail section of the joint between T. Blood, Hamilton, Mont, assignmof Bowcr,Hamilton, Mont.

Application June 15, 1938, Serial No. 213,812

the dust outlet-nipple and the dust bag of the machine.

The portable, manually controlled machine, preferablyelectrically operated, is of suitable size to be moved by hand over the surface or floor tobe' treated, and it is supported upon a hollow base or housing I having an inner bottom flange 2 formed with indicated in Figure 2 the a circular opening, andas bottom of the housing or base is of general oval shape with a front plane face 3 and a rear plane face 4. These plane faces separate two series of venting grooves 5,

one series at each side. of the central opening in the bottom or bottom-flange of the machine. These grooves radiate from the central opening to the outer periphery of the bottom, and they form plane faces 5' of small area which, like the 2 larger faces 3 and 4 glide over the floor surface,

or in a plane slightly The grooves assist elevatedabove the surface. in ventilating the interior of the housing so that the dust is conveyed to the outlet nipple 6 to which the dust bag I is joined. Thedust bag has an opening, and a slide-fastening closure indicated ported and supported at its attaching ring In that nipple 6. 7

The housing or secured thereto by screws also pass through holes in an attaching flange at 8, and the bagis supby a brace-rod 9, enclosed within the bag,

inner or lower end on the joins the bag with the hollow base has a top wall II It, and these screws l3 of the generally cylindrical motor casing I4 mounted above the base.

Above the rigid top wall ll of the housing is mounted a flexible plate or resilient diaphragm forming the bottom l5, which, in addition to wall of the motor casing,

also provides a bearing support for the lower end of the rotor, and thecircular edge of this flexible plate is perforated to accommodate the screws l2. Near the bottom of the motor casing are provided vent holes IE to provide for circulation of air within the casing and for removal of hot air currents, from the interior of the casing.

The edges of the resilient plate or diaphragm l5 are clamped beneath the flange B of the cas- 2 ing, and below this pl ate and flange is located an annular cushion I! of resilient material, as rubber suitable for the purpose. This gasket, re-

silient ring-pad, or annular cushion is interposed between the plate 15 plate H near the edg it possesses sufllcient and the face of the top e of the plate II, and while flexibility and resiliency to permit tilting of the rotary disk so that a gyratory or parted to the rotary compound movement may be imdisk, the body of the ring or cushion-pad provides a substantial support for the motor and other parts of the, machine.

The base portion of the casing is braced by the use of a handle I8 secured at I9 thereto, and this handle has a horizontal or angular arm 20 that extends diametrically across the top of the machine and terminates in a knob 2|, it being understood that the handle is grasped in one hand and the knob in the other hand for manipulating the machine.

The electric motor enclosed within the casing includes the stationary field 22, and the brushes 23 resiliently mounted in the ring 24 which is secured within the casing by screws 24' that are accessible from the exterior of the casing. The rotor of the motor includes the armature 25 and commutator ring 25' fixed to rotate with the shaft 26, and the dust-fan or blower, located in the top of the housing is also fixed to the shaft. This fan or blower includes a disk 2'! having blades 21a, and by means of the collar 21' the fan is keyed to the shaft so that it may convey dust from the interior of the housing to the outlet nipple 6. J

On the lower end of the armature shaft, which projects down through the partitions or plates l5 and Ii and terminates at the bottom opening of the housing or base, is mounted the rotary disk 28 having an abrading, sanding, or rubbing surface or face 29 of usual character. The rotary disk is threaded on the end of the armature shaft, to revolve therewith, and it may readily be unscrewed therefrom when required.

The lower bearing 30, for the armature shaft is mounted on the resilient bearing plate 05 just below the armature, which bearing is enclosed in the cup 3i, as usual.

The armature shaft, armature, and rotary disk, are depressible with a slight resilient movement due to the pressure of the resilient bearing plate l5 and the resilient ring or pad l1, and in addition to the lower bearing 30'3l, I employ a special upper bearing for the armature shaft,

' located above the commutator ring 25'.

This upper bearing includes a bearing ring 32 mounted or fixed on the shaft, and an enclosing, inverted bearing cup 33 that is non-rotatable and is provided with an upwardly extending sleeve 34 that projects through an integral collar 35 at the top centerof the motor casing. The sleeve and its enclosing collar are enclosed by the bearing head' or enlargement 36 that is fashioned integral with the brace arm 20, and an adjusting nut 31 is threaded on the projected end of the sleeve, to clamp the sleeve and collar inthe head. By loosening the nut the rotor and disk 28 may be adjusted verticallyi. within limits to vary the position of the rotary disk with relation to the bottom of the housing, and then by tightening the nut the justed position. r

The upper end 38 of the shaft is squared to parts are held in adaccommodate a wrench, for use when the rotary disk 28 is being screwed on, or unscrewed from the shaft.

may be hollow, as indicated through the handle to suitable terminals, the

The electric wires, or cord 39, are connected to I the handle l8, which at 39 in Fig. 1, and the wires may then pass.

current being under control of a conventional toggle-switch, as Mi.

Having thus fully described my invention what I claim as new and desire to secure by Letters Patent is:-

l. The combinationwith a housing forming a base, a resilient bearing-plate mounted on the base and a motor casing mounted on said plate and base, of a motor within the casing including a rotor, a rotary disk thereon, a lower bearing for the rotor mounted on said bearing plate, an upper bearing for the rotor mounted in the casing, and

means for adjusting said bearings.

2. The combination with a housing forming a base, an annular resilient cushion mounted on the housing, a circular resilient bearing plate mounted on the cushion, and a motor casing mounted on the plate and cushion, of a motor within the casing including a rotor, a lower bearing for the rotor mounted on said bearing plate,

an upper bearing for the rotor mounted in the casing, and means for adjusting said bearings and rotor.

3. The combination with a housing having a flanged open-center bottom and two lateral series of radiating grooves in the exterior face of the bottom, a motor including a rotor having a disk located in the open center of the bottom, a fan rotatable with the rotor, a dust-outlet nipple opening from the housing, a dust receptacle mounted on the nipple. and means mounted on the nipple for supporting the receptacle.

4. In a sanding machine, the combination with a base and a motor casing resiliently mounted on the base, a motor within the casing and a f;

depressible rotor forming part of the 'motor, of a rotor shaft extending into the base and supporting a suction fan and a disk, of a resiliently mounted lower bearing for the rotor, an upper bearing for the rotor including a. member rotatable therewith, a stationary member of the upper bearing adjustable and mounted in the casing, and means for securing said adjustable member in fixed relation to the casing.

5. In a sanding machine, the combination with a base, a motor casing and a resilient diaphragm between these members, of a motor including a vertically adjustable rotor having a bearing on said diaphragm, a second bearing for the rotor including a rigid member, an adjustable exteriorly threaded sleeve mounted in the casing tudinally adjustable rotor having a disk located in the open center of the bottom, a suction fan rotatable with the rotor, and resilient means forming a cushion between the housing and the PERLEY 'r. BLOOD.

' motor.