US2778168A

US2778168A - Cylinder honing tools

Info

Publication number: US2778168A
Application number: US527064A
Authority: US
Inventors: James T Clark
Original assignee: Individual
Current assignee: Individual
Priority date: 1955-08-08
Filing date: 1955-08-08
Publication date: 1957-01-22
Anticipated expiration: 1974-01-22

Description

Jan. 22, 1957 J. T. CLARK 2,778,168

CYLINDER HONING TOOLS Filed Aug. 8, 1955 INVENTOR. Y James T. Clark ATTORNEY 2,778,168 CYLINDER HONINGTOOLS James T. Clark, Fort Morgan, Colo. Application August 8, 1955, Serial No. 527,064 4 Claims. (Cl. 51-184.-4)

This invention relates to a device for honing cylinder walls and is more particularly designed for use in honing the master brake cylinders of automotive vehicles for removing glazed areas from the wall of the cylinder so that a piston will properly seat therein.

The principal object of this invention is to provide a simple compact and highly efficient cylinder 'honing tool which can be mounted in the chuck of an electric drill and which will rotate a plurality of hone stones against the cylinder wall to hone the cylindrical surface thereof.

Another object of the invention is to provide a device of this character in which the diameter of the circle traveled by the hone stones can be resiliently adjusted so as to accommodate cylinders of various diameters and so as to vary the pressure of the stones against the wall to any desired degree.

A further object is to so construct the honing tool that the bones will be diametrically expanded against the cylinder wall by centrifugal force and to provide highly efiicient cushioning means which will prevent damage to the tool should the latter be accidentally operated beyond the confining enclosure of the cylinder wall.

Other objects and advantages reside in the detail construction of the invention, which is designed for simplicity, economy, and efficiency. These will become more apparent from the following description.

I11 the following detailed description of the invention, reference is had to the accompanying drawing which forms a part hereof. Like numerals refer to like parts in all views of the drawing and throughout the description.

In the drawing:

Fig. l is a side View of the improved cylinder honing tool;

Fig. 2 is an enlarged longitudinal section through the honing extremity of the tool of Fig. 1;

Fig. 3 is a similarly enlarged cross-section, taken on the line 33, Fig. 2; and

Fig. 4 is a similarly enlarged cross section, taken on the line 44, Fig. 2.

The improved cylinder honing tool is designed to be rotated in its entirety about its longitudinal axis from any motor driven device such as an electric drill and is provided with a chuck stud designed to be chucked in the chuck of such a drill.

The chuck stud is formed with an axial socket for receiving the rear extremity of a length of flexible shaft 11. The shaft extremity is permanently clamped in its socket by crimping the stud thereabout as indicated at 12.

The forward extremity of the length of flexible shaft 11 is permanently crimped, as indicated at 13, in an axial receiving socket formed in the outer extremity of a tool shaft 14. The forward extremity of the tool shaft 14 terminates in an axial threaded stud 15 of reduced diameter.

A spider hub 16 is threaded onto the threaded stud 15 against a shoulder 17 formed by the reduction in diameter of the stud 15. The spider hub is provided with three States Patent radially projecting attachment cars 18 each of which is drilled to receive a fulcrum rivet 19.

A hone arm 20 is pivotally mounted on each fulrum rivet 19 and extends forwardly therefrom. The hone arms 20 are 'channehshaped in cross section and the two sides formed by the channel shape of each arm extend on opposite sides of the adjacent attachment ear 18 and are pivotally secured thereto by the fulcrum rivet 19.

A h is tiltably secured on the portions on each member 21 which extend on :opposite sides of the hone arm at the hinge rivets '22.

An elongated hone stone 23 is cemented to each hone frame member by means of any suitable adhesive of a type which is moisture and oil resistant.

A lever portion 24 projects rearwardly from each hone arm 20. The lever portions 24 of the three hone arms 20 The lever portions 24 extend into a conical, concentric cavity 26 formed in a cone member 27 which is longitudinally slidable on the shaft 14. The cone member '27 is constantly urged toward the lever portions 24 by means of a compression spring 28 surrounding the shaft 14. The forward extremity of the spring 28 is frictionally fitted over a spring receiving sleeve 29 formed on the cone member 27.

The rear extremity of the spring 28 is received in a spring receiving cavity 30 which is concentrically formed in the forward face of a knurled adjusting nut 31 which is threaded on suitable threads 32 formed on the shaft 14.

In use, the chuck stud 10 is placed in the chuck of 11 electric drill and the adjusting nut 31 is threaded rearwardly to relieve the compression in the spring 28 so that the resilient washer '25 can force the lever portions 24 outwardly. The outward movement of the lever portions acts against the conical surface of the cavity 26 to force the cone member 27 rearwardly and to bring the hone stones 23 toward each other so as to decrease the honing diameter.

The hone stones honed,

cone member 27 forwardly so that its internal conical surface will act against the lever radially inward. This, of course, acts to force the hone stones radially outward causing them to resiliently engage the wall of the cylinder.

The drill is now started and the hone stones are whirled circumferentially within the cylinder under the centrifugal expansive force of rotation. As they rotate, they are moved longitudinally of the cylinder to hone the cylinder surface and remove any glazed portions therefrom. The pressure of the hone stones against the cylinder wall can be accurately regulated by varying the position of the nut 31. However, the hone stones can be compressed together at any time without varying the position of the nut 31, due to the resiliency of the spring 2.8.

Should the tool be accidentally pulled from the cylinder, centrifugal force will tend to expand the hone stones relative to each other. This outward expanding action, however, will not damage the tool due to the cushion action of the resilient washer 25 against the lever portions of the arms.

Since the hone stones 23 and their supporting structures are all similar and equal in weight, the centrifugal action of all will be equal so that the tool will be automatically centered in the cylinder by centrifugal force. The drill need not be accurately centered due to the flexibility of the flexible shaft 11. a

While a specific form of the improvement has been described and illustrated herein, it is desired to be understood that the same may be varied, within the scope of the appended claims, Without departing from the spirit of the invention.

Having thus described the invention what is claimed and desired secured by Letters Patent is:

1. A cylinder honing tool comprising: a shaft; a spider hub secured on the forward extremity of said shaft; a plurality of cars projecting radially from said spider hub; a hone arm hingedly mounted on each ear and extending forwardly therefrom; a hone element tiltably mounted on the forward extremity of each hone arm; a lever secured to each hone arm and projecting rearwardly from the hinge point thereof; a resiliently compressible disc-like member surrounding said shaft and positioned between said shaft and said levers and acting in consequence of its inherent resiliency to urge said levers outwardly so as to urge said hone elements radially inward; and adjustable means for urging said lever inwardly against said compressible member.

2. A cylinder honing tool as described in claim 1 in which the latter means for urging comprises: a cone member having a conical concavity in which the extremities of said levers are received, said cone member being longitudinally movable on said shaft; a compression spring surrounding said shaft rearwardly of said cone member; and a nut threaded on said shaft and acting when rotated in one direction to compress said spring against said conical member.

3. A cylinder honing tool comprising: a shaft; a spider hub secured on the forward extremity of said shaft; a plurality of ears projecting radially from said spider hub; a hone arm hingedly mounted on each ear and extending forwardly therefrom; a hone element tiltably mounted on the forward extremity of each hone arm; a lever secured to each hone arm and projecting rearwardly from the hinge point thereof; a resiliently compressible disc-like member surrounding said shaft and positioned between said shaft and said levers and acting in consequence of its inherent resiliency to urge said levers outwardly so as to urge said hone elements radially inward; a cone member having a conical concavity in which the extremities of said levers are received, said cone member being longitudinally movable on said shaft; and means for urging said cone member toward said levers to cause the conical wall of said cavity to urge said levers inwardly against said compressible member.

4. A cylinder honing tool comprising: a shaft; a spider hub secured on the forward extremity of said shaft; a plurality of ears projecting radially from said spider hub; a hone arm hingedly mounted on each ear and extending forwardly therefrom; a hone element tiltably mounted on the forward extremity of each hone arm; a lever secured to each hone arm and projecting rearwardly from the hinge point thereof; a resiliently compressible disc-like member surrounding said shaft and positioned between said shaft and said levers and acting in consequence of its inherent resiliency to urge said levers outwardly so as to urge said hone elements radially inward; a cone member having a conical concavity in which the extremities of said levers are received, said cone member being longi tudinally movable on said shaft; means for urging said cone member toward said levers to cause the conical wall of said cavity to urge said levers inwardly against said compressible member, said latter means for urging comprising a compression spring surrounding said shaft rearward of said cone member; and a nut threaded on said shaft and acting, when rotated in one direction, to compress said spring against said conical member.

References Cited in the file of this patent UNITED STATES PATENTS 1,474,649 Storm No 20, 1923 1,567,417 Campbell Dec. 29, 1925 1,647,133 Jennings Nov. 1, 1927 2,083,685 Burk-halter June 15, 1937 2,112,120 Schmidt Mar. 22, 1938 FOREIGN PATENTS 68,080 Netherlands June 15, 1951