US1430370A - Sanding machine - Google Patents

Description

J. GALBRAITH.

SANDING MACHINE.

APPLICATION FILED APR. 2a. 1921.

1,430,370. Patented sept. 26, 1922.

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J. GALBRAITH. SANDING MACHINE-` APPLIcATloN man Amma. 192:.

Patented Sept. 26, 1922.

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SANDING MACHINE.

APPLICATION FILED APR. 2a, 192|.

l A 30,' 370. Patented Sept. 26, 1922.

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`SNDING MACHINE.

APPLICATION FILED APR. 23. 192|.

Patented Sept. 26, 1922.

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SANDING MACHINE. APPLICATION man APAR. 23. Y1921.

Patented Sept 26, 1922.

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rric- JOHN GALBRAITH, OF ST. PAUL, MINNESOTA.

SANDING MACHINE.

Application filed April 23, 1921.

To @ZZ Iwhom t may concern.'

Be it known that I, JOHN GALBRAITH, a citizen of the United States, resident of St. Paul, county of Ramsey, State of Minnesota, have invented certain new and useful Inmprovements in Sanding Machines, of which the following is a specification. y The object of my invention 1s to provide an improved form of guide bar for the sanding head or shoe to the end that the movement of the shoe or head may be more uniform and even.

A further object is to provide an improved form of drive, and means for regulating the stroke or' travel.

@ther objects of the invention will appear from the following detailed description.

In the accompanying drawings forming part of this specification,

Figure 1 is a side elevation of a machine embodying my invention;

Figure 2 is a plan view of the same;

Figure 3 is a detail view of a portion of the machine, showing the mechanism for adjusting the length of the stroke;

Figure 4 is a sectional view on the line 4-4 of Figure 3;

Figure 5 is a sectional view on the line 5--5 of Figure 4;

Figure 6 is a transverse sectional view showing the construction of the guide bar;

Figure 7 is a view on the section line 7-7 of Figure 6;

Figure 8 is a sectional view on the line 8 8 of Figure 4;

Figure 9 is a side view of the guide bar and the mechanism for raising and lowering it;

Figure 10 is a sectionalview on the line 10-10 of Figure 9;

Figure 11 is a sectional view showing the means for raising and lowering the worksupporting table;

Figure 12 is a sectional. view on the line 12-12 of Figure 11; y

Figure 13 is a. transverse sectional view showing the lever for raising and lowering the guide bar;

Figure 14 is a sectional view on the line 14-14 of Figure 2.

ln the drawing, 2 represents the frame of the machine, in which the sanding mechanism is mounted. At one end of the machine is drive -shaft 3 having at one end fixed and loose pulleys 4 and 5 and at the sanding Serial No. 464,056.

the table having suitable anti-friction rollers 13 to rest` and roll upon these rails, as usual in machines of this kind.. The rails are supported by upright screws 14 Ajournaled in the machine frame and the upper ends of these screws are geared to a horizontal shaft 15 having an operating crank 16 lby means of which the screws may be revolved and the table and the supporting rails raised and lowered in ythe machine frame to adapt the machine for pieces of work of different sizes and shapes. All this mechanism is of ordinary 'construction inV machines of this type. f f

A driving belt 17 connects the drive shaft 3 with a pulley 18 on a shaft19 that is journaled in the machine frame and has a belt connection 20 with a pulley 21 loosely mounted on a sleeve 22 that isjournaled in bearings in the machine frame. The pulley 21 has a clutch 4member 24 secured to the hub thereof and a clutch member 24a is secured to the sleeve 22 by suitable means, such as a set screw 26, and carries clutch wings 27 pivoted at 28 and adapted to engage an internal friction surface on the clutch member 24, being ynormally held out of contact with said surface by the tension of a spring 29. A bar 30 is mounted in the clutch member 24a and'has one end projecting between the wings 27 in position to separate these wings and cause them to engage the internal friction surface of the clutch member 24 when the clutch member 25 which is slidably mounted on sleeve 22 is operated.

A rod 31 is connected with the clutch member 25 and is provided with a'crank arm 32 to which the operating bar 33 is attached and adapted for movement longitudinally to oscillate the arm 32, rock the rod 31 and shift the clutch to lock or release the pulley 21, The bar 33 projects hori zontally to a position where it can be conn veniently reached by the` operator of the machine and easily manipulated to .set or release the clutch.

@ne end ot the sleeve 22 is provided with a head 34 and a screw 35 is mounted therein and carries a block 3G. A shatt 3T is mounted in the sleeve 22 and is geared at 39 to one end of the screw said sha'lt having an operating' crank 39 by means ot which the attendant may revolve the shaft 3T and the screw 35 and move the block 36 back and forth on the screw to change its position with respect to the longitudinal axis ot the supporting` sleeve and regulate the stroke or the pitman connected therewith. 40 is a pitman rod mounted at one end on the block 36 and having a fork 4l at its opposite end that is pivotally connected at 42 with a quadrant 43 mounted to rock on a pivot 44. The' teeth of the quadrant engage a pinion 45 on a shaft 46 to which la shea-ve 4T is secured. A. cable 48 engages this sheave, passes around smaller sheaves 49 at each end of the machine and forms an endless belt connection for operating the sanding' head or shoe. The position ot the sheaves 49 is indicated in Figure 6, where one of them is shown supported by a bracket 50 secured to thevmachin'e frame. n n

The sanding` head, r t'erring` to Figures 6 and 7, comprises a Jframe 51 having a universal joint portion 52 whereon the shoe 53 which engages the sanding belt is mounted. Brackets 54 are mounted on the frame 51 and anti-friction bearings such as wheels 55 and 56 are supported in said brackets in planes substantially at rile-ht angles to each other. A clamp device 51a is provided at each end ot the frame 51 tor connectingit with the operating1 cable 48, so that the rock ing of the slieave 47 and the forward and backward movement of the cable 48 will be transmitted. to the sandinghead and shoe and through the shoe and the sanding` belt to the surface of the work. y

1 provide an improved 'form of guide bar in connection with this head and shoe, consistinp; preferably of upper and lower members or bars 57 and 572L held in parallel relation by blocks 58 interposed between them. The anti-'friction bearings 55operate on the opposing inner :faces of the bars 57 and 5" and the bearings 56 operate on the longitudinal edges of the lower` bar 57e, and thereby theA shoe frame ispheld and guided with an even uniform strelre throughout its movement, K Y

The pressure of the sanding` belt is varied by the vertical adjustment of the guide bar 57 and this l prefer to accomplish by providing shafts 59 mounted in themaehine frame at one end and having hubs 59LL thereon provided with depending arms 50 connected by a bar 61 to insure uniform stroke of the arms. Arms 62 are secured to the shaft 59 and links 63 are pivotally connected with the ends ot said arms 62 and are also pivotall)l connected with links 64 which are mounted at the lower end on the guide bar 5T and pivotally connected at their opposite endswith arms G5 that are mounted on the hubs 59'7 thus conipleting` a. parallel link movement which will. insure a vertical stroke ot the `guide bar instead or an oscillating one. [i strap 65 is mounted on the middle portion ot the guide bar and is slida-bly connected by means ot a slot 57 and pin GS with a lever 69 that is mounted at one end on the machine trame and has a hand grip 70 at its opposite end to be grasped by the operator :tor depressing or raising` the guide bar. The lever (i9 also preferably has a slot il to receive a guide pin 72 on a bracket 73, said pin and slot serving` to guide the lever in its movement and enable the attendant to agpl7 thel pressureot the guide bar the desired point on the sanding belt.

W hen the clutch is thrown out or" engagement, the momentum or" the sanding head is checked by a brake on the sheave 47, as illustrated in Figure 2, wherein a bar Z 4 is pivoted at 75 to the machine iframe. WWhen the clutch operatingbar 38 is pulled toward the operator to release the clutch, the cross bar 75, pivoted on the clutch operatingbar 33 and bar 'T4 will :torce the block 77 into trictional eno'agement with the sheave 47. thus checking movement of the cable and sanding head.

ln the operation of the machine, the attendant drawing the table to its outer position will place the work thereon, having` previously adjusted the table to the desired elevatiom then will push the table and the work in under the sanding` belt and graspin the pressure lever.y will apply the desired pressure to the sanding' shoe, which in turn will transmit it through the belt to the surface oit the work. At any time during' the progress of the work the stroke or travel out the head may be varied by the adiustment of' the block connecting` the pitman rod with its operating mechanism. rThe guide bar comprising` as described, the upper and lower portions with the 'frame oi the sanding` or pressure shoe mounted between them, insures even, uniform travel ot the shoe and an equal pressure at all points on the sand-- ing belt. y

l claim as my invention: Y l. 1n asanding machine, a guide bar comprising'iiat upper and lower plates arranged in parallel relation and spaced apart and means at intervals securing' the middle portions of said plates together, an unobstructedv passage being' provided between said plates upon each side of said securing means, a sanding head arranged `beneath the lower member of said guide bar and having anti-"friction bearings on thelongitudinal edges of said lower member, and

similar bearings between said members, and a sanding shoe connected with said head.

2. ln a sanding machine, a guide bar comprising upper and lower members spaced apart and secured together in parallel relation, a sanding head having brackets arranged to straddle said guide bar and bearings carried by said brackets and fitting between the upper and lower members of said bar to slide thereon, and a shoe connected with'said sanding head.

3. The combination, with a guide bar having upper and lower sections, of a sanding head comprising a frame extending transversely of said bar and beneath the same and having upwardly projecting brackets, anti-friction wheels mounted in said frame to bear on the longitudinal edges of said bar and similar wheels mounted in said brackets in planes at right angles substantially to the other wheels and fitting between the upper and lower sections of said bar.

et. ln a sanding machine, a guide bar composed of upper and lower members having opposing guiding surfaces, a sanding head comprising a frame having bearing on the longitudinal edges of one of said guide bar members and also having brackets to straddle said guide bar, said brackets having bearing on the opposing inner sur-` faces of said. guide bar members, and a sanding shoe connected with said frame.

5. In a machine of the class described, a guide bar comprising upper and lower members spaced apart and secured together in parallel relation and having opposing guiding surfaces, a sanding head extending transversely of said bar beneath the same and having upwardly projecting members bearing on the opposing guiding surfaces, and means mounted on said head and bearing on the longitudinal edges of one of said members for holding said head against lateral movement.

6. The combination, with a guide bar having upper and lower members provided with opposing guiding surfaces, of a head having anti-friction bearings on said opposing surfaces, said head also having bearings on a longitudinal edge of said guide bar.

7. A guide-bar comprising upper and lower members spaced apart and secured t0- gether in parallel relation and having opposing guiding surfaces, a head having means fitting between the upper and lower members of said bar and having anti-friction bearings on said surfaces, and a shoe connected With said head.

In witness whereof, I have hereunto set my hand this 18th day of April, 1921.

JOHN GALBRAITH.

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