Title:
Centrifugal machine
United States Patent 2387095


Abstract:
This invention relates to improvements in centrifugal machines, and has particular reference to a novel machine of that type wherein means are provided for causing an object to be moved relative to the surface of a container for the object and to be simultaneously forced against said surface...



Inventors:
Shideler, Elbert M.
Lynn, Bloxom Harvey
Application Number:
US52233844A
Publication Date:
10/16/1945
Filing Date:
02/14/1944
Assignee:
Shideler, Elbert M.
Lynn, Bloxom Harvey
Primary Class:
Other Classes:
451/329
International Classes:
B24B31/02
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Description:

This invention relates to improvements in centrifugal machines, and has particular reference to a novel machine of that type wherein means are provided for causing an object to be moved relative to the surface of a container for the object and to be simultaneously forced against said surface with a strong, evenly distributed pressure.

A machine of the present kind may be used for many different purposes, such as abrading or polishing objects, and specific uses may be such as abrading or polishing the edges of piezo-electric crystals or other objects to bevel or round or polish the edges, beveling or polishing the edges of lenses and other circular objects, abrading or polishing spherical objects, et cetera.

The principle involved in the present machine is the creation of a centrifugal force to press an object against a surface, and to simultaneously cause a relative movement between the object and the surface against which it is pressed by the centrifugal force. This effect is produced by providing a suitable container, revolving the container in an orbital path about an axis, and rotating the container about a second axis different from that about which the container is revolved.

An important feature of a machine of the present kind is the fact that the force created is greater than that supplied by weight alone, and said force may be changed at will by controlling the rate of speed at which the container is revolved. Another advantage of a machine of the present kind is the fact that the relative movement between the object and the surface of the container may be varied by changing the speed at which the container is revolved in the orbital path. Still another advantage is that centrifugal force applied to objects of varying shapes and sizes can be used to more uniformly press an 4C object against the surface than is ordinarily possible by use of other pressure means.

A specific object of the present invention is to provide a centrifugal machine of the above kind which is comparatively simple and durable in construction, efficient in operation, and otherwise well adapted to meet the requirements for a successful commercial use.

With the above considerations and objects in view, and others that will become, apparent as 5( the nature of the invention is better understood, the invention consists in the novel form, combination and arrangement of parts hereinafter more fully described, shown in the accompanying drawings and claimed. 5i In the drawings, wherein like reference characters indicate corresponding parts throughout the several views: Figure 1 is a front elevational view of a machine constructed in accordance with the present 6( invention and primarily designed for use in abrading the edges of piezo-electric crystals to bevel the same.

Figure 2 is a vertical transverse section taken on line 2-2 of Figure 1.

Figure 3 is a similar view taken on line 3-3 of Figure 1.

Figure 4 is a central longitudinal sectional view taken on line 4-4 of Figure 2.

Figure 5 is an enlarged central longitudinal sectional view of one of the containers or tubes for the objects or crystals to be abraded or beveled, partly broken away.

Figure 6 is a transverse section taken on line 6-6 of Figure 5.

While a machine of the present kind may be adapted for many different purposes and uses, the principle and essential elements of the machine will be understood and realized from the disclosure of a machine primarily designed for use in beveling the edges of flat objects, such as piezo-electric crystals. Accordingly, such a machine has been illustrated by way of example, and the same consists of spaced standards or supports 5 having horizontally aligned bearings 6 in which is journaled a shaft 7, one end of which projects outwardly of one of the supports 5 and has a pulley 8 or the like secured thereon to facilitate driving of the shaft 7 continuously from any suitable source of power. Obviously, any desired or preferred means may be provided for starting or stopping rotation of shaft 7 or varying the speed of rotation thereof.

Secured upon the shaft I between the supports are two spaced discs 9, each having a circular series of openings therein, as at 10, within which are fitted bearings I1, the openings 10 being at corresponding distances from the shaft 7 and the axes of the discs 9. Rotatably supported in aligned bearings of the discs 9 are tubular containers 12 which are disposed parallel to the shaft 7 and to each other, and these containers are closed at corresponding ends, as at 13, and temporarily closed at the remaining corresponding ends by removable plugs or other closures 14.

Adjacent the ends of containers 12 which are closed permanently, as at 13, and at the outer side of the adjacent disc 9, a stationary eccentric 15 is provided through which the shaft 7 revolubly extends. The eccentric may be restrained against Srotation in any suitable way, such as by rigidly connecting the same to the bearing 6 of the adjacent support 5, as shown. Revolubly fitted on the eccentric 15 is a ring 16 having openings at uniform intervals in which bearings 17 are 5 fitted, said bearings being located in a circular series at equal distances from the axis of ring 16 which is coincident with the axis of eccentric 15 and below the shaft . Crank pins 18 rotatably engage in the bearings 17 and are carried 0 by the depending ends of crank arms 19 fixed on the adjacent ends of contairers .12. In use, the closures 14 are removed, and the containers 12 are filled with the piezo-electric crystals or other flat objects' 20 sd that the latter are in edge-toedge relation, as shown, in Figure 5, and so that opposed edges thereof engage the inner surfaces of the containers 12 below the centers of the latter, as shown in Figure 6. The objects or crystals 20 are then retained in place by replacing the closures 14.

In operation, shaft 7 is rotated so as to cause I the containers 12 to be revolved about the axis defined by shaft 7, said containers therefore traveling in a circular orbital path. As the- containers are thus revolved, they will be simultaneously rotated in the opposite direction about their 1 own axes due to the connection of crank arms ~9 With ring 1S that turns on stationary eccen"tric 15. In the arrangement shown, each container 12 is given one complete rotation about its own axis upon each complete revolution of the 2 unit' composed of discs 9 and containers f2 about the axis of shaft 7, Thus, the loose objects in the containers will be caused to assume an outward position relative to the axis of shaft 7 under the influence of centrifugal force, thereby caus- 2 ing the edges of the objects to be pressed against the inner surfaces of the containers 12 with a uniform pressure. By placing a fine abrasive material in the containers, the edges of the objects or crystals may be' abraded so as to bevel the 3( same, and the pressure at which the objects or crystal's are forced into engagement with the inner surfaces of the containers 12 may be readily varied by varying the speed of rotation of shaft 7. and parts rotatable therewith. Obviously, by 3 removing the crystals and turning them onequarter turn, the remaining edges of the same may be abraded for beveling them. By starting and stopping the machine, the objects or crystals may be caused tb turn over. In other words, by 4 periodically starting and stopping the machine, the law of averages may be brought into play, so that each crystal will be evenly beveled on both sides. It has been found that crystals treated in this manner have a much larger per cent of satis- 4; factorily beveled edges than can be obtained by hand operation, and the time required to bevel the edges is greatly reduced.

SIt will, of course, be understood that the number of containers may be varied, and other means may be employed for causing rotation of the containers about axes independent of the axis of revolution about which the containers move in their orbital path. Also, the invention is not limited to the use of tubular containers, since a 5 spherical container would be desirable for beveling circular objects and abrading spherical surfaces- Also, the cross sections of the containers may be varied to suit requirements, as, for instance, a rounded edge may be secured in connec6fon with rectangular objects by utilizing oval containers instead of round or circular ones.

Still further, the containers may be disposed at an angle to the shaft 1 instead of parallel therewith, or the ends of the containers may be left open t permit the objects to be introduced in one end and to be automatically discharged at the other end of each container. Such refinements arid modifications will readily suggest themselves to those skilled in the art, and their use will not constitute a departure from the spirit and scope of the invention as claimed.

What we claim as new is: 1. A non-tumbling centrifugal machine of the character described, comprising a structure emI' bodying an imperforate container of circular cross-section adapted for loose reception of objects to be treated, means for supporting and revolving said container in a circular orbital path 3 about a predetermined axis, said container being supported for free rotation about an axis different from the axis about which the container is revolved, and means to automatically-cause rotation of the container in one direction about the 0 second'-named axis when it is revolved in the opposite direction about the first-named axis.

2. A non-tumbling centrifugal machine of the character described, comprising a structure embodying supporting means rotatable about a predetermined axis, an imperforate container of circular cross-section carried by said supporting means for revolution with the latter about said axis, said container being freely rotatable about its own axis, and means to cause rotation of said 0 container in one direction about its own axis when it is revolved with said supporting means in the opposite direction about the first-named axis.

3. A-non-tumbling centrifugal machine of the 5 character described, comprising a structure embodying a rotatable shaft having means to facilitate driving the same, spaced supporting discs fixed on and rotatable with said shaft, imperforate containers of circular cross-section carried 0 by said discs and freely rotatable relative thereto about axes spaced from the axis of said shaft, and means operatively connected to corresponding ends of the containers for causing rotation of the latter in one direction about the second-named 5 axes when they are revolved with the shaft in the opposite direction about the first-named axis.

4. A non-tumbling centrifugal machine of the character described, comprising a structure embodying a horizontal rotatable shaft having 0 means to facilitate driving the same, a pair of spaced discs fixed on and rotatable with the shaft and having circular series of openings therein aligned in pairs and disposed at corresponding distances from the shaft, imperforate tubular containers of circular cross-section rotatably mounted in said openings, and means operatively connected directly with corresponding ends of the tubular containers for causing rotation of said containers in one direction, about their own axes as said containers are revolved in the opposite direction with the shaft and discs.

5. A centrifugal machine of the character described, comprising a horizontal rotatable shaft having means to facilitate driving the same, a pair of spaced discs fixed on and rotatable with the shaft and having circular series of openings therein aligned in. pairs and disposed at corresponding distances from the shaft, tubular containers rotatably mounted in said. openings, and means operatively connected with corresponding ends of the tubular containers for causing rotation of said containers about their own axes as said containers are revolved with the shaft and discs, said last-named means comprising a. stationary eccentric, a ring rotatably fitted on said eccentric, and cranks carried by corresponding ends of the containers and operatively connected to said ring.

6. A structure as defined in claim 2, wherein the last named means acts to maintain the same portion of the container uppermost throughout its orbital path of revolution about the first-named axis.

ELBERT M. SHIDELER.

HARVEY LYNN BLOXOM.