US2191256A - Hone - Google Patents

Description

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Patented Feb. 20, 1940 PATENT OFFICE noNE Howard W. Dunbar, Worcester, `and Herbert4 S. Indge, Westboro, Mass., assignorsI to Norton` Company, Worcester, Mass., a corporation of Massachusetts Application April 28, 1938, .Serial No. 204,750

3 Claims.

. our copending application Serial No. 191,478 filed February 19, 1938.

One object `of the invention is to provide a hone which will expand during the honing operation as the metal is honed. Another object of the invention is to provide a thermally controlled hone. Another object of the invention is to provide a hone the entire control of which is thermal` and which may be controlled by controlling the temperature of the honing liquid.

Another object of` the invention is to provide a novel method of honing whereby `delicate control of the diameter of the hone may be effected.

.Another object of the invention is to provide a honing tool of` simple construction. Another object of the invention is to provide a quickly adjustable honing tool having also an automatic adjustment over a micrometer range. Another object of the invention is to provide a honing tool which can be adjusted while the hone is in operaf tionto fine precision limits. Other objects will be in part obvious or. in part pointed out hereinafter,

The invention accordingly consists in the features of construction, combinations of elements and arrangements of parts, as will be exemplified in the structure to be hereinafter described and the scope of the application of which will be indicated in the following claims.

In the accompanying drawing illustrating one of many possible embodiments of the mechanical features o f this invention: l

Figure 1 is an axial sectional view of the honing tool;

Figure 2 is a cross sectional view taken on the line 2-2 of Figure 1; and

Figure 3 is a diagrammatic view of honing apparatus including the honing tool. H

Referring to Figure 3, `practically any form of drill press, not shown, may be used having a chuck to hold the hone and to rotate it and to allow it to be raised and lowered rat the will of the operator. In Figure 3 a chuck 8 is shown containing a hone 9 held by its arbor I0 in the chuck.

v Referring now to Figure 1, below the arbor I is a universal joint II. The bottom element I2 of the universal joint is connected by a cross pin I3 to a sleeve I4. Sleeve I4 has a longspline I5 in which is located a pin I6 extending through an outer sleeve I1. The sleeve |'I has atop ange I8 under which is a bottom flange I9 of a co1- lar 20. An inside collar 2| fits in the collar 20 and is fastened to it by screws 22. The collar 2|` is internally threaded and constitutes a nut and is in threaded engagement with a threaded portion 23 of the sleevelll.

By the construction so far described, the sleeves I4 and I 'I are supported by the universal joint I I and the arbor I0. They are angularly fixed relative to each other by means of the pin I 6. Nevertheless they can move axially relative to each other and may be moved by turning the collar 20. The sleeve I'I has an integral extension 21 on the bottom thereof of somewhat larger diameter than the portion I1. This extension 2'I of the sleeve I 1 has a plurality of upper apertures 26 and a plurality of lower apertures 29. In the extension 21 are located a pair of hollow cones 30 and 3| facing in opposite directions, as shown.

`Pivoted at 32 to the sleeve I4 in notches 33 thereof are rock levers 34'. The bottom of the extension 2'|\is threaded at'the inside as shown at 35 and aring 36 is screwed into it, this ring having slots 3T therein in which are pivotally mounted by means of pins 38,* rock levers 39 just like the rock 4levers 34.

`The inner ends of the rock levers 34 rest on a shoulder 40 of a pin 4I. The inner ends of the rock levers 39 rest on a shoulder 42 of a pin 43. The pins 4| and43 are located in the cams and 3|;

The cones 30` and 3| each have deep countersinks 44. In these countersinks are springs 45. Between the pins 4| and 43 is a thermostatic member indicated by the numeraly 50. This consists of curved disks 5| joined together in pairs, as by soldering or the like. Each pair of disks 5I contain a suitable liquid and each pair expands on being heated.

We provide honing sticks 55 which may be made of any suitable abrasive bonded with the desired bond. For instance, these may be made of crystalline alumina, silicon carbide or diamond -abrasive bonded with vitried ceramic bond, or metal bond, or resinoid bond, or in some cases rubber bond. Referring to Figure 2, each stick 55 is cemented to a channel support 56. Referring to Figure 1, the channel supports 56 fit in holders 51 which are fork-shaped and have inclined surfaces 58 cooperating with the cones 30 and 3|. Clip springs 60 removably holdl the channel supports 56 to the holders 51. Garter springs 6| engaging portions 62 of the channel supports 56 hold the parts together. `There may work pi'ec'e 10' by any suitable means, not shown.

In the side of the sleeve 12 is a bore I3 which is connected to a pipe 14 merging into two pip'es 15 and 16 in which are valves 'l1 and 18. The pipe 15 connects to a spiral pipe 1S in a cylinder 80. The pipe 19 is connected'toaA pipe 8l. Both of pipes 16 and 8| are connected to a pipe 82 which is connected to a pump 83 pumping liquid, such as kerosene, out of a sump 85.

The pump 83 pumpsr kerosene ultimately through the pipe 'I4 into the sleeve 12 whence it flows into the bore in the work piece 10, flooding the'honingtool 9. 'Ihence the kerosene drips back intothe; sump 85..:We provide further a steam pipe 90 and a return pipe 9i to fill the cylinder 80 with live steam. This heats the kerosene in the spiral pipe-19.l The operator may, by adjusting the valves 'H'.and "I8,` control the temperature of the kerosenein the sleeve 12 vand work piece 10. n

The thermostat 50 is sensitive to heat and,

when thel temperature rises, it expands and thereby through the mechanism described expands the honing sticks 55. AThe operator can thus control the honing operation,` causingmore pressure to be exerted against the honing-stick at any time. Such control is free from mechanical connections through t-hefsleeve I4 and arbor l0 and thus mechanical construction of the upper part of thehone is simplified. Major adjustments can be made to adapt the hone to different sizes of bores by turning the collar 20.

In the use of the invention, the hone may be contracted mechanically by turning the collar 20 until it will readily pass into the work piece, and then expanded until the abrasive elements evenly press against the work piece. The hot and cold uid is then turned on until a thermometer 93 inthe pipe T4 reads approximately the saine as room temperature. The hone is now rotated and reciprocated by thek controls provided on the machine tool, not shown. There is thus produced a light abrading action. The hot valve 'Isis now opened a little bit wider until the temperature is seen to rise n the therkmorneter 93. This will expand the liquid between able pressure and by reason of the mechanical advantage mentioned and the cone action this pressure isconsiderably increased at the abrasive stones 55.' j'

It will thusbe sejen that there has been provided by this invention apparatus and a method in which thevarious objects hereinabove set forth together with many thoroughly practical advantages are successfully achieved. As various possible embodiments might be made of the mechanical features ofthe above invention and as the artherein described might be varied in various parts, all vwithout departing from the scope of the invention,` it is to b e understood that all matter hereinbefore set forth or shown in the accompanying drawing is to be interpreted as illustrative and notl in alimiting sense.

We claim:

1. In apparatus of the class'described, a sleeve, a shank, connections between the sleeve and the shank, a pair of `coriesin the sleeve, projections engaged by thecones, abrasive elements Aon the outside of the sleeve connected to the projections, a bellows between the cones, andy adjustment meansl to' adjust theposition of the cones for a given elongation of the bellows.

2. In a hone, a plurality of abrasive sticks, a supporting structure supporting said4 sticks in parallel relation around the periphery of said supporting structure, a thermostatic device inside of said supportingstructure, and mechanical connections between said thermostatic device and said abrasive sticks. `r r 3. In apparatus as claimedin claim 2, the combination with the parts and features therein specied, oi means to prevent retrograde action o said device bypressure from` outside.

HOWARD w. DUNBAR.'A HERBERT s. INDGE.

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