US2087823A - Engine cylinder block wall reboring implement - Google Patents

Description

July 20, 1 937.

F. svAB A 2,087,823 ENGINE CYLINDER BLOCK WALL REBORING IMPLEMENT Filed July 19, 1955 2 sheet-sneet 1 /0 2s Q M ff 1 r:- 2a Q l 1 Q i K (j/6,6.

si 1 Q Q lj /z Agg" Inventor 1` YI/a l 'A I ByQ/lnwoml i: 2,4 I

A Homey July zo, 1937. E. F.' sv-AB 2,087,823

ENGINE CYLINDER BLOCK WALL REBORING IMPLEMENT Filed July 19, 1935 2 sneetsfsheet 2 Inventor Lay/@mmm Attorney l v Patented July 20, 1937 v ENGINE CYLINDER BLOCK WALL REBOR- ING IMPLEMENT Edward F. Svab, Hudson, Ohio y Application July 19, 1935, Serial vNo. .32,301V

l Claim.

This invention relates to a cylinder block wall reboring implement for engines.

The primary object of the invention is a novel design of an implement of the character referred to that permits very light construction so that it is light to handle, convenient to manipulate and easy to adjust.

A further object of the invention is to provide an implement of the character referred to that allowsthe cylinderblock of an engine to be rebored without removing the cylinder block from the chassis of an automobile.

Further objects of the invention are to provide a device of the character referred to that accommodates a change of one size to -another in a comparatively short time, that does not require the walls of the cylinder to be polished after the reboring operation, that is highly eiicient for its intended purpose and comparatively inexpensive to manufacture and operate.

With the foregoing and other objects in view the invention consists in the novel construction, combination and arrangement of parts as will be hereinafter more specifically described and illustrated in the accompanying drawings wherein is disclosed an embodiment of the invention, but it is to be understood that changes, variations, and modifications may be resorted to without departing from the spirit of the claim hereto appended:

In the drawings wherein like reference characters denote corresponding parts throughout the several views:

Figure 1 is a top plan view of the reboring implement constructed in accordance with the present invention.

Figure 2 is an end view at the upper end thereof.

Figure 3 is a diametric sectional view taken substantially on line 3-3 of Figure 1.

Figure 4 is a diametric detailed sectional view taken substantially on line 4 4 of Figure 1 and looking in the direction of the arrows.

Figure 5 is an enlarged perspective View of the upper end of the mandrel with parts thereof removed.

Figure 6 is a fragmentary perspective view of an end of one of the stabilizing blocks.

Figure '7 is a perspective fragmentary View of the blade.

Referring to the drawings in detail IU indicates generally a hollow cylindrical mandrel of uniform diameter and open at each end. It will be noted as the description proceeds that the construction of the implement admits of a Very light implement easy to handle and well balanced, and in keeping with this purpose the thickness offthe walls of the mandrel are considerably reduced, from the customary practice; The length of themandrel from one end to the other-should be such as will be slightly longer than the cylinder blocks used in internal combustion engines for automobiles. There is a blade receiving slot I I in the mandrel which extends from a point adjacent one end thereof to a point adjacent the other end thereof. The slot I I extends throughout the major portion of the mandrel. Thereare a pair of spaced longitudinally extending 'support bars I2, I3 secured by the screws I4 tothe outer face of the mandrel one to each side of the slot. The space between the confronting faces of the support bars registers with the slot I I. The bars I2, I3 are substantially coextensive with the length of the slot and the confronting edges I5, I6 respectively of the bars are parallel and disposed on a bias with respect to the diameter of the mandrel. The space between the confronting edges of the bars forms a tight sliding fit with the opposed faces of the blade as will herein-after c appear. The heads of the screws I4 are countersunk with respect to the outer faces of the bars. The blade II is an elongated bar which seats edgewise in the space between the supporting barsL I2,v I3 and the inner end thereof extends into the slot II so that the blade may be adjusted radially as will hereafter appear. The slant of the blade is in a direction away from the travel of the mandrel and the cutting edge I8 thereof is along the corner of the blade. The trailing portion of the blade is provided with the usual clearance.

Longitudinally extending stabilizing blocks I9, 20 are secured to the outer face of the mandrel by means of screws 2| the heads of which are countersunk in the outer face of the blocks. The blocks I9, 20 extend the major portion of the length of the mandrel l0 and are circumferentially spaced at points substantially equidistant from the blade support and from each other. The outer surface of the blocks are rounded so that when they rub the wall of the cylinder being rebored they will not injure the same.

Reinforcing rings 2I, 22 are secured inside of the mandrel by means of the screws 23 one adjacent each end of the mandrel. The reinforcing rings are positioned so that the ends of the blades bear on the major portion of the outer periphery. In each reinforcing ring there is a radially supported set screw 24 the head of which extends into the interior of the mandrel and the end of the shank bears against the inner edge invention the end of the mandrel away from the handle 26 is inserted in the top of the cylinder first. The blade Il should then be adjusted by the set screw 24 until they touch the walls of the cylinder to be rebored. When the blade has A been adjusted to touch the wall the mandrel is turned in a clockwise direction with respect to Figure 2 by the handle 26. It has been found by experience that the blade should never be ex-y tended above the face of the supporting blocks beyond one quarter of an inch.` If it is necessary to extend the blade further than one quarter of ari-inch it is necessary to change the stabilizing blocks 19, 20 and apply thicker or higher blocks. In other words, in reboring cylinders customarily used in automobile engines the height of the stabilizing block should never allow any greater clearance between the blocks and the cutting edge I8 of the blade of more than one-quarter of an inch. l

When the end of the mandrel is inserted to a point where the blade begins to resurface the cylinder the construction of the implement in accordance With the present invention requires very little downward pressure beside the turning of the mandrel. It has been found that the turning of the mandrel will cause the same to progressively move axially of the cylinder under its own weight.

Having described my invention, what I claim is:

A manually operated cylinder block reboring implement comprising an elongated sleeve mandrel equipped with a continuous slot extending through the wall and in an axial direction along the major portion of the length intermediate the ends of said sleeve, a pair of elongated ,As/paced blade supporting bars, of a length substantially equal to the length of the slot, said barsbeing secured to the outer periphery of the sleeve one on each side of the slot and having the space therebetween registering with said slot, the confronting edges of the bars being parallel and disposed at an angle relative to the diametric plane of the sleeve passing through the slot, an elongated blade of a length substantially equal to the length o1" the slot and seated edgewise therein, said blade extending outwardly from the slots through said space and having a tight sliding fit between the confronting edges of the supporting bars, reinforcing members' inside the sleeve, radially disposed adjusting screws carried by the reinforcing members and having their outer ends bearing against the blade to adjustably support said blade, and spaced stabilizing blocks mounted on the periphery of the sleeve in spaced relation to the supporting bars.

EDWARD F. SVAB.

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