US1934088A

US1934088A - Sanding machine

Info

Publication number: US1934088A
Application number: US431453A
Authority: US
Inventors: Robert A Ponselle
Original assignee: Individual
Current assignee: Individual
Priority date: 1930-02-26
Filing date: 1930-02-26
Publication date: 1933-11-07
Anticipated expiration: 1950-11-07

Description

Nov. 7, 1933. R. A. PoNsELLE SANDING MACHINE Filed Feb. 26, 1930 4 Sheets-Sheet l INV TOR l' ra@ [plug l/kbam/f ATTORNEY Nov. 7, 1933. R. A. PoNsELLE SANDING MACHINE Filed Feb. 26, 1930- 4 Sheets-Sheetv 2 Nov. 7, 1933. R. A. PoNsELLE SANDING MACHINE Filed Feb. 26, 1950 4 SheeAtS-Sheel'. 3

ATTORNEY( R. A. PONSELLE Nov. 7, 1933.

SANDING MACHINE Filed Feb. 26, 1930 4 Sheets-Sheet 4 Patented Nov. 7, 1933 SANDING MACHINE Robert A. Ponselle, New York, N. Y.

Application February 26, 1930. Serial No. 431,453

5 Claims.

This invention relates to sanding machines of the type in which a power-driven abrasive-covered tool forms the abrading element. More particularly the invention is concerned with a power driven sanding machine which is especially adapted for the treatment of oors and the like and which contains many novel features of construction which correct the faults of prior machines, eliminating noise and dust, preventing crooked cutting, and generally improving the efliciency of operation as well as lowering the cost of manufacture.

The sanding machine of this invention includes the usual operating drum which carries an abrasive sheet of sandpaper or the like covering its surface. Thedrum is mounted on a superstructure carried on an axle supported by a pair of wheels, and the superstructure Ais capable of swinging on the axle so that the drum may bear with greater or less pressure upon the floor surface and the superstructure is also free to tilt about the longitudinal axis of the machine, so that the drum may conform to irregularities in the floor surface. The drum is driven by an electric motor which also drives a blower connected to a hood which encloses the drum, the blower removing the sawdust cut from the floor surface by the action of the drum and discharging the sawdust into a collector bag.

The motor employed is of standard construction and it is supported on a mounting which permits the motor to be readily removed and also permits variation in the position of the motor so that the driving belt for the drum can be maintained taut at all times. The hood which encloses the drum is of novel construction and it is loosely connected to the machine so that its weight rests on the oor at all times during operation,y

the hood having an opening for the admission of air which is so placed as to prevent sawdust from escaping through the opening. The hood has a wear shoe which contacts with the oor and is replaceable when it becomes worn.

For operating on floor surfaces adjacent Walls or partitions, the new machine may be equipped with an additional drum also provided with a hood which may be connected to the blower. This smaller drum is readily attached to the machine in operating position and may be as quickly detached when its use is no longer required. The hood for the additional drum eifectively encloses the drum so that the blower may draw off the dust created by the operation of the drum and discharge it into the bag.

The new machine contains many other novel features of construction in addition to those above described, such, for example, as a novel adjustment by which the pressure with which the drum bears against the floor may be regulated,

a new handle mounting and various other features which will be made clear in the detailed description to follow.

For a better understanding 'of the invention, reference may be had to the accompanying drawings, in which Fig. 1 is a view of the invention in side elevation with parts broken away;

Fig. 2 is an elevational view of the machine illustrating the side Opposite to that shown in Fig. 1, certain of the parts being removed or shown in section for the sake of clearness;

Fig. 3 is a sectional view on the line 3-3 of Fig. 7

Fig. 4 is an end view of the machine shown in Fig. 1 with certain of the parts iuustrated 75 in section;

Fig. 5 is an end view of the machine when provided with the end drum, certain of the parts being illustrated in section;

Fig. 6 is a sectional view illustrating the man- 80 -ner of connecting the outlet from the hood for the end drum of the blower;

Fig. 7 is a plan view of the machine with certain parts broken away;

Fig. 8 is a detailed view of the carriage of 85 the machine, with parts illustrated in section, and

Fig. 9 is a sectional view on the line 9-9 of Fig. 7.

Referring now to the drawings, the machine 90 as illustrated comprises a pair of supporting wheels 10 mounted on a transverse axle 11. Mounted on the axle between the wheels is a carrier member 12 preferably made in the form of a single casting, this carrier member being provided with a boss 13 in which is received a longitudinal supporting rod 14. Pivotally mounted on the axle at opposite ends of the casting are collars 15 provided with extensions having sockets in which are received arms 16 100 forming part of the handle. These arms extend to a yoke 17 provided with a central boss 18 in `which is mounted a rod 19 which carries at its upper end a switch and fuse box 20 on the upper end of which is mounted a lug 21, from which handle bars 22 extend in opposite directions. Mounted on the under surface of the switch and fuse box is a receptacle 23 for the plug 24 on the conductor cable 25. This cable passes from the plug through an eye 26 in the end of an 110 arm 27 pivotally mounted at 28 on the cover of the box, pins 29 being provided on the box, one on each side of the pivot pin so that the arm 27 may be supported so as to extend to either side of the switch box.

Projecting upwardly from one of the collars 15 is a lug 30, the end of which lies close to the end portion of the casting 12. Threaded into the lug 31 on the carrier 12 is a screw 32

providedwith washers

33 and 33. The Washer 33 is mounted on the end portion of the screw which is of reduced diameter and the washer is held in place by the nut 34. The washer 33' is threaded on the screw and is held in position by the nut 34; the spring 35 bearing at one end against the washer and at the other end against the adjacent face of the lug prevents the parts from being turned by vibration so as to alter the adjustment. The washers are of sufficient size to overlie opposite ends of the lug 30 and they limit the swinging of the collar 15 about the axle 11. The screw 32 is adjusted in the lug 31 so that the washers lie free of the lug 30 when the handle is in proper position for the operator. When this adjustment is made, the handle floats with a limited freedom of movement, and the operator may move the handle up and down within this range without affecting the pressure with which the cutting drum bears against the iioor, as will presently be explained in detail. The adjustment of the screw permits variations in the normal position of the handle which may be required for workmen of diierent heights.

The longitudinal supporting rod 14 is mounted loosely in the boss 13 on the carrier 12. This rod is mounted rigidly in depending

lugs

36, 36 on the base member 37, the lug 36 receiving the end of the rod 14, while the lug 36' has an opening through which the rod passes. Mounted in a boss 38 extending downward from the plate 37 is a pin 39 which bears against a foot 40 on the carrier 12. This pin is forced downwardly by a spring 41 against which bears the end of an adjusting screw 42 threaded into the boss. The pin 39 with its spring assists in counterbalancing the unbalanced weight of the plate, the motor and the other parts supported on the plate. While the motor is disposed approximately centrally of the machine, the center of gravity is at one side of the center of the machine due to the weight of the blower, of the driving pulley on the motor shaft, etc.

A rod 43 having screw threads cut in its surface between its ends is mounted for rotation in the lugs.36, 36 and on the end of this rod is a crank handle` 44. Threaded on the rod is a nut 45 having an extending arm 46. This arm has a slot 47 formed in its under surface, into which extends a lug 48 on the boss. Upon rotation of the rod 43 by the handle 44, the nut 45 is moved endwise of the rod and thus produces a relative movement of the supporting rod 14 and carrier 12,. The position of the axle 11 with reference to the center of gravity of the machine is thus varied for the purpose of varying the pressure with which the operating drum bears against the floor surface, as will presently be made clear.

Mounted on the carrier 12 is a bracket 49 terminating in a pointer 50 which cooperates In the bracket is adjustably mounted a stop screw 52 adapted to bear against va block 53 on the under surface of the base member 37. This stop screw limits the swinging movement of the base member in one direction about the longitudinal axis o1' the machine. Y

Projecting upwardly at one end of the b member 37 is a boss 54 in which is mounted a rod 55 carrying a block 56 at its upper end. Mounted in this block is a rod 57 provided with heads 58 at its ends. Mounted pivotally on the rod are locking plates 59 provided with dowel pins 60 projecting from opposedfaces of the two plates. These plates are forced toward each other by springs 61 encircling the rod, and the movement of the plates toward each other is limited by stop pins 62 mounted in the rod.

The motor for driving the machine is of standard construction, provided with the usual feet 63 across which is secured a plate 64. Secured to the base plate between the feet is a yoke bracket 65, the ends of the arms 66 of the yoke being slotted so that these arms may straddle the rod 57. In the outer face of each arm is a recess 67 in which a dowel pin 60 on one of the locking 100 plates 59 may be received. To place the motor in position, the locking plates are turned downwards, the motor turned upside down and the bracket placed above the rod 57. The locking plates 59 are then spread apart against the force 105 of the springs 61 and the yoke lowered until the rod 57 is seated in the slots in the ends of the arms. The locking plates are then released and the dowel pins 60 enter the recesses 67. Since the locking plates 59 are loosely mounted on the 110 rod 57, the motor may swing on this rod as an axis. Disposed at one end of the base plate 37 is a slotted block 68 in which is pivotally mounted a lever 69 having a shoe 70, at one end of which the motor rests. Mounted in the block 68 is an 115 adjusting screw 71, the lower end of which bears against the tail 72 of the lever. By adjusting the position of the screw, the shoe on the other end of the lever may be raised and lowered to raise and lower the motor about the rod 57 as 120 a pivot.

Fast onthe forward end of the supporting rod 14 is a T block 73, in which is supported a rod 74 extending transversely to the rod 14. On the ends of the rod 74 are rigidly mounted

blocks

75, 125 75', the block 75 having an arm 76 extending forwardly parallel to the rod 14. The block 75 has a similar arm 76 extending forwardly and in the ends of these arms is mounted the shaft 77 on which is mounted the sanding drum 78. This 13C drum may be of any suitable or convenient construction, but I prefer to employ the drum shown in my co-pending application Serial No. 243,235, led December 29, 1927. The cross-rod 74 with the block 75 and arm 76 forms a rigid support- 13E ing structure for the drum shaft, and since the block 73 is fast on the rod 14 which is free to oscillate in the hub 13 on the casting 12, it will be apparent that the drum is free to tilt about the longitudinal axis of the machine to conform 14. to irregularities in the oor surface. Similarly since the rod 14 is mounted in the carrier 12 which is loosely mounted on the axle 11, the drum is free to swing about the axle as a. center. The drum thus has a universal mounting and the 145 pressure with which it bears against the floor is determined by the position of the axle 11 with reference to the center of gravity of the machine.

The drum is enclosed within a hood 79 made upA of two

parts

80 and 81 provided with ears 82 150 and 83, respectively, connected by pivot pins 84. Each of the parts and 81 is of partial cylindrical form with end plates for enclosing the ends of the drum, and these end plates are cut away to form elongated openings through which the drum shaft 77 projects. The two parts of the hood areheld together by a snap catch 86 and are also connected by a. spring 87 secured to pins on the end plates of the

hood members

80 and 81. During operation of the machine, the two parts of the hood are connected together by the catch, but when access to the drum is necessary, the catch is released and the hood member 80 swung on the pivot pins 84. The spring 87 is connected to the two parts of the hood in such manner thatwhen the parts are in the operative position illustrated (Fig. 2) the spring tends'to maintain the parts in that position. When the hood part 80 is raised to expose the drum, the spring lies on the other side of the pivot point and serves to hold the part 80 in open position. The hood terminates at its lower end in an opening dened on three sides by a rim 88 provided withA a removable wear bronze or other similar material.

In the operation of the machine, the hood lies with its entire weight resting on the rim 88 on the oor surface and formed in this rim is an opening 90 for the admission of air. vIn the machine illustrated, the drum rotates in the direction indicated by the dotted arrow in Fig. 2 and the opening 90 is formed in the rim which forms a part of the hood member 81. When the drum rotates in the manner referred to, the sawdust cut from the surface of the fioor by the abrasive covering of the drum is thrown toward the hood member 81 and the admission of air through the opening 90 placed in the hood member 81 results in the air picking up the sawdust and carrying it out of the hood to the blower. The strong current of air which is drawn through the opening 90 prevents any sawdust from escaping through the opening and at the same time insures a. better pick-up of the sawdust than would be the caseif the air were admitted elsewhere.

The drum shaft is driven by a belt 91 preferably of wedge shape, this belt running over a pulley 92 on the motor shaft and a similar pulley 93 on the drum shaft. If the belt becomes loose, it may be tightened by raising the motor by means of the lever 69 previously described.

Mounted loosely on the rod 74 at one side of the T block 73 is a yoke 94 from which extends a rod 95 entering a boss 96 projecting from the casing 97 of a blower of standard construction. A spring 98 encircling the rod 74 is arranged to swing the yoke to move the` blower away from the motor. The blower shaft is provided with a pulley 99 on which runs a belt 100 running on a large pulley i 101 on the motor shaft and the spring 98 tends to maintain this belt taut. When the belt is removed, the swinging of the blower is limited by a stop pin 102 on the yoke 94 which contacts with a similar pin 103 on the block 75.

The blower is provided with an intake fitting 104 having an opening at one end closed by a door 105. Projecting from the fitting is a neck 106 in which is mounted one end of a conduit 107 leading to an outlet opening 108 formed as a part of the hood 78. The conduit is flexible and is preferably made of a canvas sleeve within which is disposed a spring 109 which prevents collapse of the sleeve. The blower has an outlet opening 110 to which is connected a conduit 111 leading to an elbow 112. This elbow is provided with an opening to which is connected a bag 113. This bag has a neck 114 which is received in the end of the elbow 112 and'held therein by means of a set screw 115. The bag has an open end normally closed by a clip 115. In normal operation, the bag rests on the upper surface of the plate 64 connecting the feet of the motor. The conduit 107 is` flexible kand extensible so that it does not interfere with the rising and falling of the hood in accordance with irregularities in the floor surface.

When the machine is to be used for operating the floor surface adjacent to walls or partitions. a narrow drum 117, known as an end drum, is employed. This drum is mounted on a shaft 118 threaded into the main end of the shaft 77. The drum is mounted for rotation with shaft 118 and it is provided with a disc 119 having dowel pins 120 which enter suitable recesses in the outer face of the pulley 93 and serve to secure the drum to the pulley for rotation therewith. The end drum is enclosed in a hood 121 mounted on a bracket 122 which is secured to the block 75. The block has an extension 123 with a boss 124 formed thereon and the bracket 122 is provided with a boss 125 in which is mounted a pin 126 receivable in the boss 124. On the boss 125 is a pin 127 which is receivable in the slot in a yoke 128 formed on the end of the block 75. To secure the bracket to the block 75', the bracket is swung so that the pin 127 is free of the yoke 128. Then pin 126 is inserted in the boss 124 and the bracket swung so that pin 127 enters the slot in the yoke 128. Theposition of the hood 121 with reference to the floor can be adjusted by means of a screw 129 mounted in an arm 130 extending from the boss 125 and bearing against a projection 131 from the block-75'. By threading the screw 129 in and out of the arm 130, the position of the bracket with reference to the axis of boss 124 may be varied and thus the position of the hood with reference to the floor may be adjusted. Y

The hood 121 is provided with an outlet neck 132 connected by a iiexible and extensible conduit 133 to a tubular fitting 134. This fitting may be inserted in the opening in the intake member 104 of the blower by the door 105 and the tubular member is of such length that when it is inserted in position, it extends across the end of the neck 106 and closes that neck. The door 105 is mounted in tongues 135 formed on the fitting 134 and the door is provided with a lug 136 which may be engaged behind a circumferential flange 137 on the tubular fitting 134 to hold the fitting against removal. It will be apparent that with the construction described, the insertion of the tubular fitting 134 into the intake member 104 of the blower causes the full suction -of the blower to be applied to the hood 121. Accordingly, although this hood is rigidly mounted and not in contact with the floor, escape of the sawdust from the hood is prevented by the strong current of air entering beneath the rim of the hood.

When the machine is provided with the end drum and used for treating floor surfaces along walls and the like, it is desirable to have the axle 11 as far forward toward the drum as possible, and to lock the superstructure against tilting on the longitudinal axis of the machine. For this purpose, the base plate 37 is provided near its forward end with an adjustable screw 138 which carries a block 139 at its lower end, this block having a U-shaped groove inits circumference. Mounted on the carrier 12 is a plate 141, in the upper end of which is adjustably mounted a screw 142 having a pointed end 143 which is adapted to enter the U-shaped groove in the block 139. By turning the crank handle 44 in the proper direction, the axle may be moved forward until the end of the screw 142 enters the block 139 and this locks the superstructure against swinging movement about rod 14 as an axis. By regulation of the screw 138 up or down relative to the base plate, the machine is levelled so that the end drum will cut evenly across its entire face.

It will be seen from the detailed description of the embodiment of the invention illustrated that the new machine has many features of novelty which afford great convenience in operation and permit the machine to be used with utmost emciency. Regulation of the numerous parts is readily obtained and the machine can be quickly and easily adjusted for best working conditions. The machine operates without discharging a large amount of sawdust into the room as has heretofore been the case with sanding machines of this type. In the present machine, the sawdust is picked up and delivered to the co1- iecting bag regardless of whether the machine is used with the main drum or the sanding drum. The new hood which rests in contact with the floor insures that there will be a maximum pickup of the dust and in the case of the small end drum hood, the application of the full suction of the blower to the small hood achieves the same result.v The adjustability of the handle permits diiferent workmen to operate the machine with the utmost convenience, and since the motor is readily removable and constitutes about half the weight of the machine, the removal of the motor permits the machine to -be carried without difficulty from floor to floor. In the machines as heretofore constructed with the motor rigidly secured in place, the weight of the average machine is such that it cannot be carried up and down stairs by a single workman. The present machine is not only lighter in weight than prior machines designed for the same work, but in addition the removal of the motor cuts in half the load that the workman must carry at one time.

What I claim is:

1. In a sanding machine, a base, a rolling support for the base, an upward extension from the base provided with la pivot rod, a motor having a slotted member adapted to straddle said rod. and means for locking said member against release from said rod.

2. In a sanding machine, a base, a rolling support for the base, an upward extension from the base, a motor, a plate attached to the motor casing, a pivot rod mounted on the base, said plate being slotted to straddle said rod with the motor lying at one side of the rod, and means on the base for adjusting the position of the motor with reference to the rod.

3. In a sanding machine, a pair of sanding drums, a hood enclosing each drum, each hood having an opening through which the drum operates, a, blower having an intake fitting with a pair of openings, a conduit connected to one hood and to said fitting at one of said openings, and a conduit connected to the other hood and having an end receivable in the other opening, said end of the conduit when in place in its opening serving to close the other opening.

4. In a sanding machine, a pair of sanding drums, a hood enclosing each drum, each hood having an opening through which the drum operates, a blower having an intake fitting with a pair of openings, a door for one opening, a conduit connected to one hood and to the tting at the other of said openings, a conduit connected to the other hood and having an end receivable in the first opening when said door i: opened, said end closing the said opening, and means on the door for engaging said conduit inserted in the door opening and operable to hold it in place. y

5. In a sanding machine, a horizontal shaft supported from the surface to be treated by rollers thereon, a frame mounted on said shaft and tiltable about the axis of the shaft, a base member mounted on the frame and tiltable at right angles to the direction in which the frame is tiltable, mechanism carried by the base member, said base member and mechanism being unbalanced and tending to tilt, and an adjustable resilient means for resisting the tilting movement.

ROBERT A. PONSELLE.