US2111955A

US2111955A - Grinding and polishing apparatus

Info

Publication number: US2111955A
Application number: US98177A
Authority: US
Inventors: William R Akans
Original assignee: Individual
Current assignee: Individual
Priority date: 1936-08-27
Filing date: 1936-08-27
Publication date: 1938-03-22
Anticipated expiration: 1955-03-22

Description

March 22, 1938. w. a AKANS 2,111,955

GRINDING AND POLISHING APPARATUS Filed Aug. 27, 1936 INVENTOR WE. Ahmw v ATTORNEY Patented Mar. 22, 1938 barren *sra'les Lemar creme My invention relates. to grinding and polishing apparatus and contemplates the provision of apparatus of this kind adapted for use in producing highly finished surfaces on valve seats and the like, and has for an object the provision 10f a device which may be readily mounted in'a drill press, boring mill, or the like for rotational movement to-grind or polish surfaces. I

My invention further contemplates the provision of a device of this kind provided with flexible coupling means adapted to overcome inaccuracy in the alignment of the work in the machine.

My invention further contemplates the provision of a grinding and polishing apparatus embodying means by which the working pressure of the finishing elements upon the work may be readily regulated by the operator.

My invention further contemplates the provision of grinding and polishing apparatus in which the plate bearing the finishing elements is removable therefrom for assembly therewith inside a valve. 7

My invention further contemplates the provision of a grinding and polishing apparatus provided, with improved means for mounting the finishin material, such as cloth covered with abrasive material, in Working position on the device.

My invention embodies other novel features, details of construction, and arrangement of parts which are hereinafter set forth in the specification and claims and shown in the accompanying drawing.

Apparatus embodying features of my invention is illustrated in the accompanying drawing,

forming part of this application, wherein:

Fig. 1 is a View in side elevation of my improved grinding and polishing device, the plate employed to carry the finishing elements being removed therefrom;

Fig. 2 is a sectional View taken along the line II-II of Fig. 3, showing the working plate having a pair of finishing members attached thereon;

Fig. 3 is a plan view of the working plate;

Fig. 4 is a sectional view taken along the line IV-IV of Fig. 1;

Fig. 5 is a sectional view taken along the line V-V of Fig. 1;

Fig. 6 is a sectional View taken along the line VI-VI of Fig. 2; and

Fig. 7 is a sectional view taken along the line VII-VII of Fig. 4. v

Referring now to the drawing for a better understanding of my invention, I show a grinding attachment plate I 2.

andpdlishihg apparatus comprising a shaft 8 which is adapted to'be-rotated by any suitable 'mieansx On the lower end of the shaft is formed a shoulder or flange portion. 9 which is snugly fitted for movement in a recess II formed in the The attachment plate is provided with an inwardly turned flange portion ill for engagement with the shoulder 9 when same is in its upper position.

The shaft is slotted at l3 above the shoulder portion 9 to receive a driving plate M- which rests uponthe flange it and between the projections 56 of the attachment plate. A pivot point ll is also mounted in the slot l3 and is held against displacement by a collar l8 which forms a spring seat for the lower end of the spring it. A sleeve 2| is secured to the upper end of the shaft by means of the set screw 22 and is threaded at 23 to receive an internally threaded adjustment the working plate and are formed with grooves 33 adapted to receive the flange 3 2 of the locking collar. The attachment plate and locking collar are slotted at 36 and 37 respectively to receive the locking pins.

The plate 2? is formed with a plurality of slots 33, each of which is adapted to receive the upright portion 39 of an abrasive holder ll. The holders 4! are held in position by means of screws 42 and are grooved along their sides at as to receive the ends of an abrasive strip 34 which is held against displacement by clips 55 formed of spring wire and pivotally mounted at 36. While the holders illustrated in the drawing are adapted for use in grinding and polishing fiat valve seats, other forms may readily be mounted on the plate for use in finishing tapered valve seats. When employed in the finishing of fiat valve seats, the bottom of each of the holders t! is preferably formed convex to provide a line contact between the abrasive strips and the work.

A centering point 41 is provided on the end of the shaft for use in aligning the work in the machine, and a spring pressed ball 48 is provided in the attachment plate for engagement in notches 49 formed in the locking collar 3|.

The attachment plate l2 and the locking collar 3| are formed with aligning slots 49 adapted to receive a spring locking member 5| to hold collar in position on the attachment plate.

In the operation of the apparatus thus described, the shaft 8 is adapted to be rotated by a drill press or the like and.- a downward pressure is exerted upon the shaft to place the spring 19 under compression. Rotational movement is transmitted from the shaft to the working plate 21 by means of the driving plate l4 engaging the projections l6 formed on the attachment plate l2. As it is very difiicult to align the work at exactly right angles to the aXis of the shaft 8, I have provided the flexible connection between the shaft and the working plate M in which, the downward pressure upon the shaft is directed to the working plate through a one point contact provided by the pivot point I! and the rotational movement is through the driving plate I4 and attachment plate l2. The pressure of the abrasive strips 44 upon the work may readily be varied by turning the adjustment sleeve 24.

While I have shown my invention in but one form, it is obvious to those skilled in the art that it is not so limited but is susceptible of various changes and modifications without departing from the spirit thereof; and I desire, therefore, that only such limitations shall be placed thereupon as are imposed by the prior art.

I claim:

1. In a grinding and polishing apparatus, a driving shaft, an attachment plate mounted for axial movement on said driving shaft, a compression spring mounted on the driving shaft to yieldably resist an axial movement of the attachment plate along the driving shaft, a pivot point interposed between the compression spring and the attachment plate, a working plate, work finishing elements mounted on the working plate, clip means for holding strips of abrasive material on the work finishing elements, means for detachably connecting the working plate to the attachment plate and means for varying the resistance offered by the compression spring when the attachment plate moves inwardly.

2. In a grinding and polishing apparatus, a driving shaft, an attachment plate mounted for axial movement on said driving shaft, spring means to yieldably resist an axial movement of the attachment plate along the driving shaft, a pivot point interposed between the spring means and the attachment plate, a working plate, a work finishing element mounted on the working plate, means for detachably connecting the working plate to the attachment plate and means for varying the resistance offered by the spring means when the attachment plate moves inwardly.

WILLIAM R. AKANS.