US2238326A - Honing device - Google Patents

Description

Apfil 15, 1941. H. s. INDGE 2,238,326

HQNING DEVICE Filed Nov. 26, 1938 2 Sheets-Sheet 1 i 11, @1,1m 59W@ ww .10.1446 Rig/m) April 15, 1941. H. S. INDG 2,238,326.

Houma Amsvlcr: Filed Nov. 2e, 19:58 2 sheets-sheet 2 Jaz .9a

0 v 54 50 J6 J8 J4- Jlz l l J4 17:4 JZ J0 il I 56 9 44 l 44 I 58 a 66 Ja J2 f 6a 48 4Z 62 5a -j 6a 5 J4 jLLt 'J4 v 3mm/www Patented Apr. 15, 1941 HONING DEVICE Herbert S. Indgc, Wcstboro, Mass., assigner to Norton Company, Worcester, Mass.,

tion of Massachusetts Application November 26, 1938, Serial No. 242,445

3 Claims.

This invention relates to a device for honing or polishing cylindrical surfaces.

One object of the invention is to provide a honing device capable of honing an external cylindrical surface which is so constructed that `the honing sticks may be readily adjusted to predetermined positions land held in proper abrading contact with the work, and when the hone is withdrawn from the work, the sticks are automatically moved radially away from a normal honing operation by self contained mechanism within the head. Fur-ther objects will be appare-nt in the following disclosure Referring to the drawings, which illustrate one embodiment of this invention:

Fig. l is a fragmentary vertical section of the honing device with the parts in their operative honing positions;

Fig. 2 is a similar View, with the parts in their inoperative positions; and

Fig. 3 is a section on the line 3-3 of Fig. 2.

In accordance with this invention, I have provided a mechanism for honing cylindrical surfaces by means of one or more abrasive sticks which are both reciprocated and revolved about the axis of the work surface. The mechanism comprises honing sticks which are removably mounted on a revolving and reciprocating head and which are adjustably positioned relative to the work by suitable mechanical devices, such as Wedge blocks and cooperating members, which insure that the honing sticks make a proper abrading contact with the work and may be adjusted uniformly and to the same extent. The

preferred construction also serves to hold the honing sticks in an operative, manually adjusted honing relation to a work surface only during the honing operation, and when the hone is moved axially of the work to an inoperative position, the abrasive sticks are moved radially, so that they may be readily replaced and the work easily removed. This is preferably accomplished by means of a manually adjustable wedge block or cone operatively connected to apply the required pressure on the abrasive sticks which is held in its adjusted position only while the hone reciprocates between certain limits defined by a stop which opposes. the tendency of a spring to move the cone from its normal operative position. The honing mechanism illustrated in the drawings comprises the honing stick I0, and preferably a plurality of the same, which may be of standard construction and in present form are mounted as by cement in a hollow backingmember I2.

These abrading sticks may-be formed f ar Corporafrom suitable abrasive material, such as crystalline alumina or silicon carbide, cemented together by standard bonds, rsuch as rubber, synthetic resins or vitried ceramic materials, and

l the honing sticks and their mounts may be constructed in accordance with standard procedure. Ihe backing I2 carries two spaced' pins I4 projecting substantially radially therefrom in the assembled device. The pins have wedge or cone shaped ends I6 adapted to slidably nt against the opposed beveled shaped surfaces I8 on two spaced wedge blocks or tapered rings 2D shaped as frustrums of a cone. The angles of the surfaces of the tapered rings and the tapered pins are preferably about 45 or as desired, and the parts are so arranged that when the upper and lower rings 20 are moved towards each other, the pins are moved radially inwardly and thus vcarry the abrading sticks I 0 towards the surface of the work 24 to be honed. The work piece may be yof any suitable construction and mounted as desired for the honing operation, and in the present case it comprises an ordinary cylindrical pin suitably mounted in a vertical position on a standard 2B.

The honing head which carries the abrasive sticks comprises a housing formed as a cylindrical body having a reduced central tubular portion 32 adapted to be threaded to the supporting member thereabove. 'I'he abrasive sticks and their backing supports I2 and the pins I4 are all mounted to revolve substantially concentrically ofthe axis ofthe tube 32. The pins project through holesA 34 in the cylindrical housing 30 which thus form bearing supports for the radially movable abrading sticks. j

The metal container I2 is secured, as by welding, to a bent plate 36 projecting above and below the container and shaped as illustrated, so that at its upper hook shaped ends, the plate is engagedr and held voutwardly by a resilient spring 38 secured on the inner top wall of the housing 30. The lower hook shaped ends of the plates are likewise heldv outwardly by springs 40 which are hooked to a framework 42 suspended from the housing 30.

The framework 42 is a hollow rectangular piece (Fig. 3) positioned below and substantially surrounding the housing 36. It has arms 44 spaced about apart which extend upwardly and out wardly and then turn inwardly as shown in Fig. 1.k They terminate in lugs 46 which are attached to the upper outside portion of the cylindrical housing 30, as by means of cap screws. Vertical pins 48 are screwed into the rectangular ring 42,

and at their upper ends they pass through holes in the upper portions of the arms 44. Surrounding each pin 48 is a sleeve 50 on which the two conical rings 20 are slidably mounted. Hence, the opposed conical blocks 20 may move towards and from each other vertically as required for adjusting the abrasive sticks.

Attached to the upper and lower wedge blocks 20 are pairs of linksI 56 and 58 connected together by pins 69. Each pin 66 extends laterally through an elongated guiding slot 62 in a web 63 (Fig. 2) at each side of the hone which forms a part 'of the frame 44. The other end of this pin extends into a swinging arm 64 which is pivotally mounted at 66 on the bracket or arm 44, as shown at the right hand portion of Fig. 1. The upper end of this arm 64 carries a roller 68 which rides against the tapered surface of a cone or wedge block 10 which is movable up and down for adjusting the positions of the wedge blocks. This lever 64 moves the pin 60 inwardly and outwardly, depending upon its position on the cone and thus moves the links 56 and 58 and so spreads or pulls together the conical ring 28, thus moving the abrasive sticks inwardly or outwardly. A coiled spring 12 surrounding each sleeve 5|) is arranged to hold the wedge blocks in their expanded position, as shown in Fig. 2, and this leaves the abrasive sticks out of contact with the work except when the rollers 68 are thrust outwardly by the cone 19. The cone is slidably mounted on and keyed to a hollow cylindrical tube 80 which is screw threaded at its lower end to the upwardly projecting end of the housing 38.

This cone 'l0 may be adjusted vertically on the tube 80 by means of a manually operated device comprising a nut 82 threaded onto the tube 8D. A split sleeve 84 surrounds the tube 80 and has an outwardly projecting flanged portion interlocking with an inwardly projecting flanged portion of a locking sleeve 86 which is fixed to the nut 82 by a cap screw, whereby the nut 82 may be manually revolved to raise and lower the split sleeve 84.

A primary feature of this invention involves the provision of mechanism which releases the honing pressure on the abrasive sticks or causes them to move radially when the honing operation is finished. This is accomplished in the pres'ent embodiment by means of a stop device which holds the cone l0 in its operative position only while the honing sticks are being reciprocated norm-ally and permits the cone to move upwardly and permit the arms 64 to move inwardly and release the abrasive sticks when the latter are reciprocated to an. inoperative position out of contact with the work.

In the construction shown, each of the halves of the split sleeve 84 carries two `diametrically opposed lugs 88. On these are pivotally mounted the links 90, which are in turn pivotally connected to the link 92. The latter are pivotally connected to ears 94 on the cone 19. An extension or cam 96 on the outer end of each link 92 rides against the inner cylindrical surface of a hardened sleeve 98 in a ring |90 which is suitably mounted on the framework of the machine. This sleeve 98 serves as a guide or a stop against which rides the outwardly projecting end 96 of the link 92. the springs |82 connecting the links, the outer end 96 of the lower link is held in position against the guiding ring or stop 98, so that the latter determines the position of the cone. The stop 98 is of suflicient height so that the end of each link tion of Fig. 2 when inoperative.

Under the resilient force applied by 92 will normally ride within it as it revolves during a normal honing operation and the link end 96 will not reciprocate far enough to run out of contact. When the honing tool is to be removed from operative contact with the work, then this link will be moved outwardly beyond the stop ring 98 as shown in Fig. 2, and the springs |02 will draw the cone upwardly and so hold it out of contact with the rollers 68, thus permitting the abrading sticks to move to and be held in their outward non-abrading positions. The end 96 of the link is so shaped as a cam that it will readily return inside of the guide ring or stop when the honing head is lowered. This construction makes it easy to replace the honing sticks.

The upper end of the tube 80 is connected by a double universal joint with a reciprocating spindle ||0 which both rotates and reciprocates within the supporting sleeve I2 suitably mounted on the framework of the machine, these parts being made in accordance with standard construction and forming no portion of the present invention, the lower universal joint comprising a ball ||4 on the lower end of a tube ||6 which carries the socket of the upper universal joint. The socket of the lower joint is formed by suitably shaping the upper end ||8 of the tube 80 to fit against the lower surface of the ball. Similarly, an upper interiitting surface |20 is formed on each of the two parts of a split sleeve |22 which is held in place by a collar |24 secured by a cap screw to the upper end of the tube 80. A pin |26 passing through the ball ||4 serves to limit the swinging motion of the honing head. The construction of the upper ball and socket joint is similar and need not be further described, these parts being substantially as shown in the prior patent to Indge No. 2,082,737 of June 1, 1937.

The operation of the construction will be apparent in View of the `above disclosure. Suitable honing or abrasive sticks l0 and their backing plates I2 are mounted in the machine with their cone shaped pins |4 projecting into contact with the tapered rings 20. The parts are in the posi- The work is mounted axially of the honing sticks and therebetween. Then the honing head is lowered and the lugs 96 are forced inside of the ring guide 98 thus driving the cone 10 downwardly and moving the rollers 68 onto the tapered surface thereof and moving them outwardly. This forces the rings 20 towards each other and thus causes the honing sticks to engage the Work. The nut 82 may be rotated to adjust the cone to its correct position and thus hold the abrading sticks in predetermined positicns and with a required pressure against the work. As the hones wear away, this nut may be adjusted to take up for wear. The head is reciprocated and rotated until the abrasive sticks have produced a desired surface by the criss-cross break up motion of the abrasive grains. At the end of the honing operation, the head is moved up until the cam ends 96 leave the stop ring 98 and the abrasive sticks y outwardly under the impulse of their springs '12.

It will now be apparent that by means of the construction above described, I have provided a simple mechanism for positively positioning abrasive honing sticks relative to a cylindrical work surface, and which causes them to be automatically moved out of an operative position when the honing head is moved axially away from the work. Various modifications may be made in this construction, and equivalent mechanisms substituted for those above described; hence the drawings and description thereof are to be considered as illustrative and not as limiting the invention except as required by the wording of the claims appended hereto.

I claim:

1. A device for honing a cylindrical work surface comprising a rotatable and reciprocable head, an abrasive stick mounted thereon for radial movement relative to the work surface, a wedging device movably mounted on the head which serves to locate and hold the -abrasive stick against radial movement, a wedge block having a tapered wedging surface which is vertically slidable on the head, adjustable means for holding the wedge block in a xed adjustment during a honing operation, and means including a laterally movable member engaging and located by the tapered wedging surface of the wedge block which positions said Wedging device and the associated abrasive stick and thereby holds the latter located for honing the Work.

2. A honing device comprising a rotatable and reciprocable column, having a housing at its lower end, a wedge block having a tapered Wedging surface which is vertically slidable on the column, abrasive sticks mounted within the housing for radial movement relative to a work piece,

means including wedging devices which position the abrasive sticks relative to a work piece, means including a laterally movable arm engaging and located by the tapered wedging surface of the wedge block which is positively connected to move and hold a wedging device for locating an abrasive stick relative to the work and means for adjusting the position of the wedge block and holding it in a xed adjustment during a honing operation.

3. A honing device comprising a rotary and reciprocatory head, a plurality of abrasive sticks mounted thereon for radial movement relative to a work piece, movable Wedges which position the sticks, a stationary guide having ia slide surface, a movable cam on the head which engages and is located by said slide surface during a normal honing operation, a Wedge block having a tapered wedging surface which is vertically slidable on the head and positioned by said cam, means for adjusting the position of the wedge block, a member contacting with the tapered wedging surface of the wedge block and located thereby, means connecting said member and the movable Wedges which locate the abrasive sticks during a honing operation and means for withdrawing the sticks from their honing positions when the cam is moved out of contact with the guide surface.

HERBERT S. INDGE.

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