US3065579A

US3065579A - Cylinder honing tool

Info

Publication number: US3065579A
Application number: US131969A
Authority: US
Inventors: James T Clark
Original assignee: Clark Feather Manufacturing Co
Current assignee: Clark Feather Manufacturing Co
Priority date: 1961-08-10
Filing date: 1961-08-10
Publication date: 1962-11-27
Anticipated expiration: 1979-11-27

Description

1962 J. T. CLARK CYLINDER HONING TOOL Filed Aug. 10, 1961 INVENTOR. JAMES T. CLARK ATTORNEY 3,065,579 CYLINDER HONING T001.

James T. Clark, Fort Morgan, Colo., assignor to Clark- Feather Manufacturing (10., Fort Morgan, Colo, a corporation of Colorado Filed Aug. 10, 1961, Ser. No. 131,969 3 Claims. ((11. 51-1842) This invention relates to a rotary cylinder honing tool for deglazing and resurfacing the wall of an internal combustion engine cylinder.

The principal object of the invention is to provide an easily handled, rapid and efiicient cylinder honing tool for use in a conventional electric drill which will be selfcentering and self-bottoming and which can be quickly slipped into a cylinder of any size and which will automatically, resiliently and uniformly expand to accurately maintain honing elements against the wall of the selected cylinder regardless of the internal diameter of the latter.

While the improved cylinder honing tool will automatically expand to accommodate a wide range of cylinder diameters, for instance a standard model thereof accommodates cylinders from 2" to 7" in diameter, it has been found that in the usual shop, working on the smaller cylinders of the popular brands of automobile engines, it is inconvenient to be required to constantly contract the tool from its large maximum capacity for insertion into the smaller diameter cylinders being conventionally worked upon. Therefore, another object of this invention is to provide, in a honing tool of a large diameter capacity, means for limiting the expansion thereof to a diameter convenient for use upon the particular cylinders upon which the shop is working thus making it unnecessary to constantly contract the hone from its full capacity for insertion into the smaller diameter cylinders.

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

In 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. 1 is a perspective view of the improved cylinder honing tool as it would appear when being inserted into the upper extremity of a conventional automotive cylinder liner as indicated at 10;

FIG. 2 is a fragmentary vertical section taken on the line 22, in FIG. 3; and

FIG. 3 is a cross section looking downwardly on the line 33, FIG. 2.

The cylinder honing tool of this invention employs a vertical pivot shaft portion 11 driven through the medium of a flexible shaft portion 12 from a drive shaft portion 13 arranged to be inserted in the chuck of a conventional electric drill. The drive shaft portion 13 is connected to the flexible shaft portion 12 in any suitable manner, such as by means of a coupling sleeve 14, and the flexible shaft portion 12 is fixedly mounted in a receiving socket 15 in the upper extremity of the pivot shaft portion 11.

The drive shaft portion 13 is threaded, as indicated at 16, to receive a spring-compression-adjusting nut 17 which acts to compress a spring 18 against a yoke 19 which is slidably mounted on the pivot shaft portion 11.

The pivot shaft portion 11 is also threaded, as indicated at 20, to receive a maximum-diameter pro-setting nut 21 and the lower extremity of the pivot shaft portion 11 is reduced in diameter and threaded to form a terminal stud 22 upon which an arm spreader 23 is fixedly mounted by means of a suitable clamp nut 24.

. Patented Nov. 27, 1962 The yoke 19 is formed with three hinge bosses 25 projecting radially at spacing. Each hinge boss is drilled to receive a hinge rivet 26 upon which the upper extremity of a hone arm 27 is hingedly mounted.

The three hone arms 27 are channel-shaped in cross section and each is convoluted longitudinally to form an outwardly and downwardly inclined upper portion 28, an inwardly and downwardly inclined medial portion 29 and a downwardly extending lower terminal portion 30 upon the lower extremity of which a foot member 31 is tiltably mounted by means of a pivot rivet 32.

The foot members 31 carry elongated honing pads 33 adhesively mounted on their outer faces. The pads may be rectangular abrasive stones or may be of felt or similar material. Preferably, one of the foot members 31 will carry a felt pad and the remaining two foot members will carry abrasive stone pads.

The sides of the channels forming the upper arm portions 28 are turned inwardly to form opposed retaining flanges 34. The arm spreader 23 is shaped to form three spokes 35 the extremities of which extend into the channels of the upper arm portions 28. The sides of the spokes 35 are notched, as shown at 36, to receive the inturned retaining flanges 34, as shown in FIG. 3.

In use, hone arms are squeezed together in the hand until the foot members 31 can be inserted into the upper extremity of a cylinder or cylinder liner. The tool is then forced downwardly so that the hone pads 33 ride fiat against the cylinder wall. When the hone arms are compressed together the flanges 34 of their upper portions 28 slide upwardly in the spoke notches 36 forcing the yoke 19 upwardly against the bias of the compression spring.

When the hone arms are released, the expansion of the spring 18 forces the yoke downwardly causing the flanges 34 to ride downwardly and outwardly in their spoke notches 36 to press the pads 33 outwardly against the cylinder walls while the tool is rotated by the electric drill motor. Since the

shaft portions

11, 12 and 13 are flexible any inaccuracies in incline or tilt of the drill motor are automatically accommodated. If cylinders of smaller diameter than the maximum capacity of the tool are being constantly worked upon, the repeated squeezing or contraction of the hone arms to the smaller cylinder diameter becomes a tedious, time-consuming task.

The latter task is avoided by the use of the maximum diameter pro-setting nut 21. The latter nut acts to stop the descent of the yoke 19, and the expansion of the hone arms 2?, at any desired point. For instance, if relative cylinders are being honed, the nut 21 is threaded upwardly on the pivot shaft portion 11 until the maximum expansion of'the hone arms is just suflicient to position the foot member rivets on a radius slightly less than the radius of the cylinder, as shown in FIG. 1. The nut 21 is then fixed in position in any desired manner such as by means of a suitable set screw 37. After the latter setting has been made, the tool can be quickly forced into the smaller cylinders without the preliminary squeezing.

While a specific form of the improvement has been described and illustrated herein, it is 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 to be secured by Letters Patent is:

1. A cylinder honing tool comprising: a vertical shaft; an arm spreader mounted on the lower extremity of said shaft; a yoke slidably mounted on said shaft above said spreader; hone arms hinged to and depending from said yoke in contact with said spreader; foot members pivotally mounted on the lower extremities of said hone arms; abrasive means carried by said foot members; a compression spring acting to urge said yoke downwardly to cause said hone arms to swing outwardly in consequence of their contact with said spreader; and adjustable stop means for stopping the downward travel of said yoke at any desired point, said stop means comprising a nut threaded on said shaft between said spreader and said yoke and positioned to be contacted by the yoke as the latter descends under the influence of said spring.

2. A cylinder honing tool as described in claim I having means for fixedly locking said nut at any desired position on said shaft.

3. A cylinder honing tool comprising: a vertical shaft; an arm spreader mounted on the lower extremity of said shaft; a yoke slidably mounted on said shaft above said spreader; hone arms hinged to and depending from said yoke in contact with said spreader; foot members pivotally mounted on the lower extremities of said hone arms; abrasive means carried by said foot members; a compresward movement of the latter at any desired point.

References Cited in the file of this patent UNITED STATES PATENTS 1,567,417 Campbell Dec. 29, 1925 2,560,727 Keiser July 17, 1951 2,736,146 Brooks Feb. 28, 1956 2,778,168 Clark Jan. 22, 1957 2,782,572 Clark Feb. 26, 1957 3,005,294 Kushmuk Oct. 24, 1961