US1656182A - Buffing machine - Google Patents

Description

force air through the Patented Jan. 17, 1928.

UNITED STATES 7 1,656,182 PATENT OFFICE.

v ERNST FREDERIK HENRY ENNA, OI COPENHAGEN, DENMARK.

I BUFFING MACHINE.

- Application filed latch 27, 1925, Serial No. 18,778, and in Great Britain August 30, 1924.

- This invention relates to butting-machines,

more particularly for use in finishing the.

provided with an abrasive. cover, t e pad be ing maintained. in an inflated condition by means of a suitable air pump, adapted to spindle into the pad to inflate the same. i

The object of the present invention is to provide a buffin -machine characterized as above stated, of simple construction and adapted to maintain a charge of air within the inflatable pad for a considerable time, without renewal.

To this end according to this invention, the pump for producing and maintaining the pressure in the inflatable pad comprises a piston fixed to one'end of the spindle, and a cylinder slidable on the spindle and the piston, the spindle having a longitudinal air duct, and the cylinder-being adapted to be reciprocated by hand so as to deliver air past a non-return valve in the duct of the spindle and thence to the interior of the pad. A relief valve is preferably provided at a convenient point in the spindle, with its stem extending through the wall thereof, whereby the pressure may be relieved when desired.

Means for securing the pad aswell as its abrasive cover, to one end of the spindle,

conveniently comprises an annular seat rigidly mounted on the spindle, and an annular clamping member carried and adapted to be moved longitudinally by a nut, having a screw-thread engagement with the spindle,

so as to clamp. an annular flange on the pad, together with the pad cover, between the clamping member and the seat.

The accompanying drawing forming a partof this specification, shows partly in elevation and partly in section, a bufling machine embodying the invention, the main portion of the supporting frame being omitted.

In the drawings, A designates a frame member or portion, adapted to be secured to a main supporting frame (not shown), by

means of a rod 13. The member A is rovided with two bearings C and D w ich preferably of rubber, adapted to back a cover of abrasive material .such as sandpaper, emer cloth or the like. The pad is provide with an annular flange F. This flange, and the margin of the abrasive cover are confined by attaching means includingan annular seat G, fixed to the spindle, and a longitudinally movable clamping member H.

The clamping member H is movable into and out of its clamping position by means of a nut H, having a groove therein engaged by a flange H at the upper end of the tubular shank H of the clamping member. To the upper end of the spindle is fixed a piston of the cup leather type. J designates a cylinder which is slidable on the spindle and piston. The cylinder J is provided with an vair inlet J,'below the piston K and can be reciprocated b hand, so as to force air through the duct into the pad F, a non-return valve L being provided in the duct to prevent the return of air to the cylinder. The valve L may be of the type usually employed in pneumatic tires, and yields or opens when the cylinder is projected toward the pad, and closes when the cylinder is retracted.

A spring M is provided serving to yieldingly arrest the upward movement or retraction of the cylinder J. The spindle is provided with an air vent between its ends, and with a spring-pressed relief valve N, the stem of which projects from the spindle and is manually movable to open the air vent and permit the escape of air to reduce the pressure in the pad.

In machines of this type it is usual to provide aduct for conveying away the dust produced by the bufling. In order that the spindle E may be adjusted so as to bring the pad F adjacent the mouth of such duct, the rod B is adapted to be clamped to its support at any point in its length.

The vertical position of the pulley E with reference to the bearing members C and D can be varied, as for example, by reversing the sleeve on which the pulley is mounted.

The details of construction may be varied without departing from the splrit of the invention as defined by the following claims.

I claim:

1. In a bufling machine, the combination of a tubular rotatable spindle, an inflatable pad secured to one end of the spindle and communicating with the bore thereof, a piston secured to the other end of the spindle and provided with a continuation of the spindle bore, a manually movable pump cylinder into which the piston and adjacent end of the spindle extend, said cylinder be- ,ing adapted to be reciprocated over the piston and spindle in the direction of the len h of the spindle, a non-return valve wit in the air duct adjacent the piston, the" and having a section of its body adjacent said flange exteriorly threaded, an inflatable I the end of the spin pad having a portion of its casing extending inward over said flange on the spindle, an annular clamping member surrounding the spindle and having one end ada ted to clamp the pad casirg againstthe ange at e and its opposite end provided with a flan e, a nut engaging the threaded section of t e spindle,,and having an interior groove engaging the flange on the clampin member whereby the clamping member wil be positively moved both to-i ward and from the pad as the nut is rotated,

and means communicating with the interior of the spindle for forcing air into the pad to inflate the latter.

In testimony whereof have affixed my signature.

ERNST FREDERIK HENRY ENNA.

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