US1760581A - Expansible piston - Google Patents

Description

May 27, I930. c. BURNS I 1,760,531

EXPANSIBLE PISTON Filed May 31, 1927' INVENTOR. 3 Leonaraifi'i 15 /726,

, ATTORNEY.

i An adjustable,

Patented May 27, 1930.)

UNITED STATES PATENT oFrIcE LEONARD c. BURNS, or PORTLAND, onneon nxrmsmrn rrs'ron Application filed May 81, 1927. Serial No. 195,504.

plunger, hereinafter termed a piston, of the class referred to constructed in a manner whereby it can be expeditiously expanded to meet requirements when the wall of a cylinder has become worn, under such conditions 1 overcoming the necessity of the employment of an oversized piston and the re-boring of the cylinder wal Further objects of the invention are to provide, in a manner as hereinafter set forth, an adjustable expansible piston which is simple in its construction and arrangement, strong, durable, compact, thoroughly efficient in its use, conveniently adjusted and expanded when desired, readily assembled and comparatively'inexpensive to set up.

With the foregoing and other objects in View the invention "consists of the novel con-v struction, combination and arrangement of parts, as hereinafter more specifically described and illustrated in the accompanying drawings, wherein is shown an embodiment of the'invention, but it is to be understood that changes, variations and modifications can be resorted to which fall within the scope 30 of the claims hereunto appended. In the drawings wherein like reference characters denote. corresponding parts 7 throughout the several views:

Figurel is a vertical sectional view of a piston, in accordance with'this invention, in a normal position prior to the expansion thereof. I

Figure 2 is a vertical sectional view of the piston adjusted to provide for the expansion thereof.

Figure 3 is a plan view of the retainer plate. Figure 4 is a plan View of one of the shims. Figure 5 is an inverted plan view of one of the expanders. 9

Fi re 6 is a cross sectional view of a modifiedorm of expander. i I

expandible piston, in accordanc with this invention, comprises a core reerred to generally by the reference character 1 and formed of a cylindrical portion2 and a tapered portion 3, which at its largerend merges into the cylindrical portion 4 2 and is inset with respect to the outer edge j of said portion 2 thereby providing in con-.

.nection with the latter a shoulder or seat 4 which extends entirely around the pointof mergence of the tapered portion 3 with the cylindrical portion 2. The rear end of the core 1 is formed with a concave recess 5 69 provide a clearance for the operation of the 50 piston rod 6. The recess 5 is of a depth less than half the length of thecore 1 and extends through the portion 2 and for a short distance in the portion 3. i

The tapered ,portion 3, of the core 1 is formed with a transversely extending opening 7 which is intersected centrally thereof by a lengthwise extending rectangular slot 8, the latter mergesat its forward end into an opening 9 which communicates with a socket 70 10 at the forward end of the tapered portion 3. The slot 8, opening 9 and socket 10 are arranged at the axis of the core 1. The slot 8 is ofgreater length than the opening 9, of.a length greater than the depth of the socket l0 and opens at its rear end into the recess 5. The diameter of the opening 9 is less than the width of slot 8 and socket 10. r

The head of the rod 6, indicated at 11, is positioned within the slot 8 and is formed with atransversely extending -o ening 12, through which-extends a wrist vpm 13, the latter being mounted in the opening, 7 formed in the tapered ortion 3 of the core 1. The forward end 0 the head 11, of the rod 6,'-is spaced from the base of the slot 8 thereby providing a clearance for the head 11 during the pivoting movements thereof. r,

Arranged within the forward end of the tapered portion 3, of the core 1, as well as projecting forwardly from the latter is a peripherally threaded coupling member 14, having its rear end providedwith a head 15 a which abuts against the wall at the forward end of the slot 8. The member 14 extends through, the opening 9 and socket 10 and projects a substantlal distance forwardly with res ect to the forward end of the bore 1. The unction of the coupling member 14 will be, presently referred to. t

The tapered portion 3, of the core 1 may be of any desired length and diameter and it is adapted to have mounted thereon a set of expander elements. These elements can be constructed of any suitable material and the number of elements of the set can be as desired, depending upon the length of the tapered (portion 3. By way of exam le' three expan er elements are illustrate as ar-. ran ed in enveloping position with respect to t e tapered portion 3 of the core 1. The expander elements are indicated at 16, 17 and 18. The outer'diameter of each of the expander elements is the same. Each expander element is in the form of an annulus. The inner faces of each expander element conform in contour to the peripheral shape of the tapered portion 3 of the core 1. Undersuch conditions the inner face of each expander element is tapered and by this. arranger'nent each expander element has the body thereof gradually increasing in thickness in cross section from the follower face to the forward face of the element The body portion of the. element 18 is of less thickness than the body portion of the element 17 and the body portion of the latter is of less thickness than the body portion of the element 16.

The outer sides of the expander elements are flush with each other and the inner side of the expander element 16 forms a continuation of the inner side of the expander element 17 and the inner side of the expander element 17 forms a continuation of the inner side of the expender element 18. As shown each of the expander elements is provided with a split and such split is indicated at 19 in Figure 5. It will be understood that the body portion of each expander element can be set up other than that as shown to provide for the expansive characteristic of each element.

Associated with the expander elements is a set of shims and the shims of the set are indicated at 20. Each of the shims is in the forwardly with respect to the plate 21. Co-

acting with the plate 21 for thepurpose of clamping it in position, whereby the plate in connection with the shims 20 will maintain the expanders in enveloping position with re-- sp'ect to the tapered portions 3 of the core 1, is clamping nut or sleeve 23 which has threaded engagement with the threads of the coupling member 14 and is formed at its forwardend with a laterally extending, annular flange 24 which overlaps the plate 21 whereby the latter is clamped in position.

It will be assumed that the normal position of the iston is as shown in Figure 1 and that it is desired to expand the same. When the piston is in normal position, the expander 16 has its forward faceflush with the tapered portion 3 of the core 1. As illustrated by way of example four shims 20 are employed for the purpose of positioning the expander elements, so that the element 16 will have its forward face flush with the for,- ward end of the tapered portion 3. Now it will be assumed that the piston is to beexpanded. Two of the shims 20 are removed from the position as shown in Figure 1 and element is illustrated, and which is indicated at 25. The outer periphery of the element 25 is formed withwa groove 26 to receive a packing element or ring. Otherwise than that as stated the construction of tlfe expander element 25 shown in Figure 6 is the same as that shown in Figures 1, 2 and 5. p

The piston construction provides means whereby it can be expeditiously adjusted and expanded, when occasion requires and especially when the wall of'a cylinder has become I I worn, under such conditions overcoming the necessity of the employment of an oversized piston and the re-boring ofthe cylinder wall. Furthermore the piston construction can be quickly and expeditiously assembled so that it can be employed with any desired size of c linder, new or otherwise. Therefore it is thought the many advantages of an expansible piston, in accordance with this invention can be readily understood, and althoughvthe preferred embodiment of the invention is as illustrated and described, yet it is to be understood that changes in the details of construction can be had which will fall within the scope of the invention as claimed.

What I claim is z 1, In an expansible piston a core formed of a cylindrical portion, and a forwardly directed tapered portion of greater length and of less diameter throughout than said rear portion, said core having its rear end pro vided with a recess extending through said rear portion and into said tapering portion, sald tapering portion formed at its axis with a rectangular, lengthwise extending slot, an v opening and a socket, said opening interposed between and communicating with said socket and slot, sald opening being of a diameter less than that of the socket and less than the width of the slot, said tapering portion further formed with a diametrically extendin opening intersected centrally thereof by sa1 slot, and said slot opening into said recess and said socket opening at the forward end of said tapered portlon.

2. In an extensible piston a core provided with means for receiving ex ander elements and further provided at its ongitudinalmedian respectivel with a rectangular slot to receive the hea of the piston rod, an opening of less diameter than and communicating with the forward end of the slot, a socket communicating at its rearwith said opening and a diametrlcally disposed opening intersecting said slot and ada ted to receive a wrist pin for the piston rod ead, combined with means for retaining the ex ander elements on the core and including a tu ular element having a head positioned in the slot forwardly "of the head of the piston rod, said element extending forwardly through said opening and 7 socket.

In an expansible piston a core provided intermediate its ends and at its longitudinal median with a rectangular slot completely open at its rear and partly open at its forward end and providing for the reception of the head of a piston rod and for the head at the rear end of a forwardly directed anchoring means for retaining means for expander elements, and said core further'formed with a diametrically disposed wrist pin receiving opening intersected transversely thereof by said slot;

4. In an expansible piston a core provided with means for receiving expander elements,

said core formed at its forward end with a socket, at its rear end with a recess and in proximity and in advance of a diametrically disposed wrist pin receiving opening, said core further formed at its longltudinal median with a rectangular slot for receiving the head of a piston rod, said'slot intersection said opening, open at its rear end and communicating at 1ts forward end with said socket, combined with a forwardly directed, headed anchoring element for a retaining means for v the expander elements, said anchoring element extending through and projecting from said socket and having its head positioned in said slot and coacting with the forward end wall of the slot to retain it in the core, the head of the anchoring element positioned forwardly of the head of the piston rod.

In testimony whereof, Igalfix my signature hereto. p

LEONARD C. BURNS.

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