US1972890A

US1972890A - Cylinder grinder

Info

Publication number: US1972890A
Application number: US231365A
Authority: US
Inventors: Marsden C Hutto
Original assignee: HUTTO ENGINEERING Co Inc
Current assignee: HUTTO ENGINEERING Co Inc; HUTTO ENGINEERING COMPANY Inc
Priority date: 1927-11-05
Filing date: 1927-11-05
Publication date: 1934-09-11
Anticipated expiration: 1951-09-11
Also published as: GB296619A; FR650335A; DE508454C

Description

Se t. 11, 1934. HUTTO 1,972,890

CYLINDER GRINDER Filed Nov. 5, 1927 2 Sheets-Sheet l INVENTOR. Maize/v (3 W 0 A TTORNEY$ Sept. 11, 1934. Q HUTTO 1,972,890

CYLINDER GRINDER Filed Nov. 5, 1927 2 Sheets-Sheet 2 I N V EN TOR. MfiJJf/V Z 40770 A TTORNEY6 Patented Sept. 11, 1934 1,972,sso

1,972,890 CYLINDER Gunman- Marsden C. Hutto, Detroit, Mich., assignor to Hutto Engineering Company, Inc., a corporation of Michigan Application November 5', 1927, Serial No. 231,365

3 Claims.

This invention relates to cylinder grinders, and the object is to provide a new and improved construction in devices of this class resulting in a greater freedom of movement and more accurate operation of the grinding elements than is possible with the usual former constructions.

Many previous cylinder grinders for instance as is shown in my United States Letters Patent No. 1,610,681, issued December 14, 1926, have a series of grinding stones supported in carriers and the carriers are each provided with a pair of space pins riding in apertures in the body of the device and supported at the inner ends by an adjusting element.

In all such former structures in which pins are utilized to engage through apertures of the body, the pins are a fairly close fit in the apertures and thus, due to the rigidity of the pairs of pins relative' to the carrier and their movement on parallel lines radially of the body, the extent to whichthe carriers may tilt. relative to the longitudinal axis of the body is limited by the permissible clearance of the pins in their apertures. In the grinding of a tapered cylinder for instance the extent of movement of the stone carriers radially at opposite ends sometimes differs to such an extent that the pins tend. to bind in the apertures and even, in extreme cases, to "lock" in the tilted position.

The particular purpose and feature of this invention is to'provide a grinder of the general character disclosed in my said Patent No. 1,610,681 in which the stone carrier is not attached to the means employed to contact the adjusting cones but is supported from lateral movement by the structure of the body (it conveniently being channeled for the purpose), and in the place of the pair of pins heretofore employed I .utilize a single plate having two feet or contacting portions one for each of the cones and on the opposite side having two projecting points or lug like portions to contact the stone carrier adjacent opposite ends thereof, the plate being free to assume any of the positions required to permit or cause the face of the stone to assume a position at an angle to the axis of the body of the tool. Additional features of the invention are involved in the specific details of construction of the adjusting plate and the provision of means for reducing wear while preventing natural longitudinal movement of the plate relative to the body of the tool. These and other objects and novel features of the invention are hereinafter more fully described and claimed, and the preferred form of construction of a cylinder grinder embodying my invention is-shown in the accompanying drawings in which- Fig. 1 is a longitudinal section of my improved cylinder grinder.

Fig. 2 is a cross section thereof taken on line 22 of Fig. 1. Fig. 3 is a section taken on line 33 of Fig. 1. Fig. 4 isa perspective view of the adjusting plate.

Fig. 5 is a perspective view of a portion of the stone and its carrier.

Generically the 'tool herein described and claimed operates on the same general principle as that of the cylinder grinder shown in U. S. Patent No. 1,610,681--that' is, there is a body, a series of abrasives and carriers therefor extending longitudinally of the body, and oppositely disposed cone members in an adjustably fixed relation within the interior of the body which through the means interposed between the carrier and the T5 cones may cause the faces of the abrasives or stones to contact the wall of a cylinder nonparallel with the axis of the tool, the cones providing a positive backing for the abrasives in any position assumed during reciprocation and rotation of the tool of the cylinder.

In the arrangement of the device herein shown the body of the grinder is indicated at 1 and this body is provided with a pair of ring like members 2 and 3 extending outwardly from the body adjacent each end thereof. The body is also provided with a central longitudinal aperture or bore 4 in which are positioned the spaced adjusting cones 5 and 6 connected by a rod '7 which is threaded at one end for engagement with the threaded central aperture of thecone 5. The opposite cone 6 is preferably free to turn on the rod and is recessed to receive the head 8 thereof. This head 8 is provided with a slot by means of which the rod '7 may be turned to -vary the distance apart of the cones and the cone 6 is held in its position against the head by means of a coiled spring 9 interposed between the said cones about the rod 7.

and ring like points is to hold the cone members from lateral movement in the bore of the tool but ,permitting sliding thereof longitudinally. These ring like portions 12 and 13 are preferably formed integrally with the cone members. This body is provided with a head as indicated at 14 and this v the spirit of this invention.

head is to be understood as being of a character adapted for attachment to the reciprocating and rotating means (not here shown). and it is further to be understood that any means of attachment of the body to a driver of the desired char- .acter may be employed without departing from As will be understood more clearly from Fig. 2 each ring like member 2 and 3 extends outwardly from the main portion 1 of the body and are preferably integrally formed therewith. The periphcries of these ,ring members are notched as indicated at 15 providing portions 16 which are slotted on a line parallel with the axis of the tool to receive the carriers 17 which are of channel like form in cross section. The abrasives or stones 18 are set into these channels of the car- .riers by means of a cement or solder preferably after the manner of mounting as disclosed in my pending application Serial No. 116,835, filed June 18, 1926. As will be understood from Fig. 5 the carriers on this opposite side wall are provided 'with a projection 19 having

rounded end portions

20, 21 which loosely fit between the adjacent faces of the two ring portions 2 and 3 the purpose of which is to prevent longitudinal movement of the carrier relative to the tool in the grinding operation. Whatever the method employed of securing the abrasive in the carrier it is desirable that the outer or grinding face of the abrasive should be parallel with the base of the supporting channel 17 in order that the said faces shall all cut the same circle in their revolution of the tool.

In order that the abrasive holders may tilt so that the grinding faces may, if the character of the work as demanded, operate at an angle to the of the body and engaging the oppositely disposed cones at their inner ends but too great freedom -of movement of the pins in the apertures cause "the tool to chatter and vibrate in its operation .which is undesirable and also upon the'tilting of the carrier through movement of the adjusting cones the movement is occasionally sufilciently great to cause the pins to bind or lock in the apertures. To obviate this dimculty I have dispensed with the pins such as were provided in the cylinder grinder shown in my former patent and the plate in its desired position without material longitudinal movement in its slot I provide hardened

pins

24 and 25 inserted in apertures formed near the end of each slot in the ring member and extending nearly to the wall of thecentral bore. The outer ends of these pins are preferably peened over as indicated at 26- to hold the pins from dropping out of the body when the stone carriers 17 are not in place. These pins are so spaced they are practically the same distance between opposite adjacent faces thereof as the distance between the

high points

27 and 28 of the plate 23 it being observed that the plate at the end isformed with a curved part providing these high points, the remaining faces of the ends extending inwardly from the curved portion to per-.

'mit the plate to tilt in its slot without binding .the. upper faces of which may be slightly rounded on which the carriers are supported, it being noted that the carriers are unattachedto the body or to the plate but are held in their respective slots in contact with these

lugs

31 and 32 of the respective plates by

springs

33 and 34 at opposite ends. These springs engage over pins 35 and 36 provided at opposite ends of each of the carriers and are of the usual garter type and the purpose of which is to contract the carriers. The rounded ends of. the

lugs

31 and 32 provide a practically live contact of the carrier, with the adjusting plate 23 in each instance which is maintained throughout the possible tilting movement of the stone and carrier indicated generally by dotted lines 40 in Fig. l which is the position assumed by each of the carriers when adjusted to contact a cylinder wall at an angle to the cylinder axis. 1

In the operation of the tool it is evident from the foregoing description that the control element consisting of two cones and the adjusting screw and spring float asa unit with the cones in an adjustably fixed or rigid'relation on the longitudinal axis of the tool subject to control in position by reason of contact with the respective feet or lug portions 29 and 31 of the adjusting plates 3. This will be more clearly understood from t e following- This tool is first set into the cylinder to be ground approximately the full length of the abrasives. The cone adjusting screw '7 is then turned, by means of a screw driverfor instance, inserted into the bore from that end, which draws the cones together and thus the abrasives and carriers are expanded to pressure contact with the cylinder wall. If the cylinder be tapered in form the pressure at that part of the cylinder of least diameter will cause the cones to move longitudinally so that the feet portions 29 for instance may occupy a position on the cone 5 of less. or greater diameter than that occupied by the lug portions 30 on the cones 6 and upon the setting of the stones to the desired pressure contact with the cylinder walls the tool through proper attachment to a driving element, is caused to be reciprocated and simultaneously rotated in the cylinder. In this movement longitudinally of the cylinder, due to the tapered character or out of round condition of the cylinder the pressure exerted on the cones by reason of contact of the abrasives with the cylinder wall may cause the cones to move as the pressure is varied upon the opposite .ends of the stones and as these stones grind themselves free from pressure the cones are again set up to cause pressure contactof the stones with the the stone faces lie parallel with the axis of'the cylinder wall and the operation repeated until adjusting element is automatic and due to the' uses of the plate like element between the carrier and the cone adjusting element and the absence of lack of mechanical connection between the' plate and the carrier there is no possible binding of the plates in their respective slots each being free to assume any of the angular relations as may be determined by the character of work being operated on and each of the parts performs its function without possibility of its binding or becoming locked in any of the adjusted positions of the plate or carriers. This freedom in operation of the parts is secured particularly by reason of the cone and carrier contacting points or portions being in fixed relationship one to the other and capable of movement as a unit through the automatic movement of the adjusting cone element, and it is to be understood that while the plate like element 23 shown and described is the preferred form of element to be positioned between the carriers and adjusting cones other forms may be utilized without departing from the spirit and scope of the invention as .set forth in the appended claims.

I claim:

1. In a grinding device, a head having a central, longitudinal bore, a series of abrading members extending longitudinally of the head in circumferentially spaced relation and radially movable relative thereto, a control element in the bore including a pair of oppositely disposed cones ment, said body having a slot for each plate' in adjustably fixed relation movable longitudinally of the bore in either direction as a unit, a radially disposed plate for each abrading elemounted in its slot and adapted to rock therein in a plane cutting the axis of the tool providing a construction whereby the varying pressures to which the abrading elements are subjected at their opposite ends in the grinding operation is transmitted to the cones and causing the control element to move as a unit to a position to equalize the pressure.

2. In a grinding device, a head having a central longitudinal bore, a series of abrading members in circumferentially spaced relation and ra-.

dially movable relative to the axis of the head, the abrading members consisting of an abrasive stick and a channel like holder therefor, said head having grooves providing channel like portions to redirection in the said bore, and a plate interposed between each abrading member and the cones supported in the head and adapted to rock in a plane cutting the axis of the tool through a difference in pressure between opposite ends of the abrading members thereby causing the control element to move to equalize the pressure upon the cones.

3. In a grinding device a head having a central longitudinal bore, a series of abrading members of narrow elongated form positioned about the head in circumferentially spaced relation, an adjustable control element movable longitudinally of the said bore, and a plateinterposed between each abrading element and the control element, the said head having a radial slot for each of said plates in which the plates may rock in a plane cutting the longitudinal axis of the tool by reason of unequal pressure to which opposite ends of the abrading members may be subjectedin the grindment to equalize the pressure.

MARSDEN C. HU'ITO.