US1462742A - Positioning means for pistons - Google Patents

Description

Patented July 24, 1923.

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LEWIS DAVIS AND ROBERT M. HUGHES, OF SAN FRANCISCO, CALIFORNIA.

POSITIONING MEANS FOR PISTONS.

Application filed October 10,1921. SeriaI No. 506,795.

To all whom it 'mae concern:

Be it known that we, LEWIS R. DAVIS and ROBERT M. Hncnris, citizens ofthe United States, and residents. respectively, of San Francisco, countyof San Francisco and State of California, have invented a new and useful Positioning Means for Pistons, of which the following is a specification.

The present invention relates to improvements in positioning means for pistons or the like and itsparticular object is to provide means for positioning the internal studs of a piston so as to aline the same with a drill guide for the purpose of boring a hole through the studs adapted to receive the wrist pin to which the connecting rod is attached. Our device is particularly adapted to facilitate the positioning of the stud and to accomplish the latter object with very little loss of-time and with machine-like accuracy. I f V The preferred form of our device is shown in the accompanying drawing in which Figure 1 represents a top plan view of our device'and Figure 2 a side elevation of the same showing the piston in its place, but part of the same broken away so as to disclose the interior.

It will be understood that slight changes or modifications might be made without departing from the spirit of the invention or leaving the scope of the claims hereto attached.

The frame member (1), comprising a horizontal plate (2), a vertical transverse flange and two longitudinal flanges (4) and (5), is secured to the base plate by means of the bolts A second frame member (9), comprising a horizontal. plate (11) and a vertical transverse flange (12), is adjustably secured to the same base (7) in parallel relation to the frame member (1) by means of two bolts (14), the heads of which slidably engage grooves (15) in the base plate in the manner shown in the drawing, while the nuts (16), when screwed tightly on the bolts, force the horizontal plate (11) into firm contact with the base plate so as to secure the former plate against sliding motion. In this manner the distance between the two vertical flanges and (12) may be changed at will. The flange (3) is provided with a cone-shaped projection (21) which is axially alined with an opposing centering device (22) supported in the flange (12) in co-operative relation with the conical projection (21). The centering device consists of a pointed pin (23) slidably supported in a boss (24) secured on the frame member (12) and adapted to be moved back and forth by means of the hand wheel (26) actuating a screw (30), in a well known manner. It will be understood that the device thus far described serves for the support of the piston (27) 011 the axis defined by the cone (21') and the centering device (22). It is adjustable by means of the bolts (14) sliding in the grooves (15) to receive within reasonable limits any size of piston desired which'may be quickly placed in position by being slipped over the cone with its open endand by then being engaged by the centering device (22) in its center, whereupon a moving forward of the centering device by means of the hand wheel (26) will force the piston into the desired position.

Over the two flanges and (12), which are of equal height, the plate (29) is supported and held in position by means of bolts (31). It will be noticed that the plate it provided with a longitudinal slot (32) at either end so that the position of the plate relative to the frame members is adjustable. The plate is provided preferably in its center with a perforation (30) which latter extends also through the boss (33) forming an integral part of the plate (29). This perforation (30) serves as a guide for the drill and it is the principal object of the present invention to provide means which will mechanically aline the studs (34) iI1- side the piston with the perforation (30) so that a drill guided through the latter perforation will strike the studs centrally. To accomplish this we provide a preferably square bar (36) which is supported in the frame member (1) in axial alinement with the cone (21) and the centering device (22), and which may be pushed forward and backward by means of the handle (37), which rests slidably on the flange (5) and is pivotally supported in a somewhat higher portion of the flange (4) by means of the pin (38). The handle extends through a horizontal slot (39) in the bar (36), the slot being shaped as shown in Figure 1 so as to allow the handle to work the bar in the manner designated. The bar extends into the piston as shown in the drawing and slidably supports at its end a vertical member (41), the other end of which ex Lil tends into operative proximity with one of the studs (34) and is provided with a fork (42) shaped as shown in dotted lines in Figure 1 and presenting two inner faces (43) slanting toward each other and adapted to engage the stud (34). The member (41), the exact position of which may be regulated by means of the set screw (44) is always parallel to the axis of the drill guide and the fork is arranged symmetrically on the member (41 so that whenever the fork is in firm engagement with the stud (34) the latter must be axially alincd with the drill guide (32).

It will thus be seen that after the piston has been properly centered in the manner hereinbefore described and one of the studs (34) has been positioned approximately in line with the drill guide, it is only necessary to push the bar (36) forward by means of the handle (37) when the fork will engage the stud (34) and force the same into exact alinement with the drill guide.

l/Ve claim:

1. A drill jig for holding pistons having an internal stud, comprising means for axially supportin' the tube and means engaging the stu for adjusting its position relative to the axis of the tube, said means comprising a fork having two inclined inner surfaces adapted to engage the stud and sliding means for intensifying the engagement whereby the stud is forced into a central position relative to the fork.

2. A drilljig for holding pistons having an internal stud relative to a drill guide, comprising means for axially supporting the tube so as to bring the stud into the transverse plane of the drill guide and means for axially alining the stud with the latter, said means comprising a fork having two inclined inner surfaces adapted to engage the stud and sliding means for intensifying the engagement whereby the stud is forced into a central position relative to the fork.

3. A machine for drilling a diametrical hole through an internal stud of a piston,

com risin a drill uide means for osii b V D.. i7

tioning the piston transversely of the drill axial centering means for the piston sup-.

ported in the frame members, a drill guide adjustably supported on the frame members adapted to be brought into the transverse plane of the stud, and means supported in one frame member for axially alining the stud with the drill guide, said means comprising an angular bar slidingly supported in the frame member in axial alinement with the piston, and means associated therewith for positioning the stud.

5. A machine for drilling a diametrical hole through an internal stud of a piston, comprising two frame members adjustably supported in spaced relation to each other, i

axial centering means for the piston supported in the frame members, a drill guide adjustably supported on the frame members adapted to be brought into the transverse plane of the stud, and means supported in one frame member for axially alining the stud with the drill guide, said means comprising an angular bar slidingly supported in the frame member in axial alinement with the piston, a fork associated therewith having two inclined inner surfaces for engaging the stud and manually actuated means for intensifying the engagement between the fork and the stud whereby the latter is centered relative to the former.

LElVIS R. DAVIS.

ROBERT M. HUGHES.

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