US1447222A - Rod and arm combination - Google Patents

Description

Mar. 6, 1923. 1,447,222

w. NOBLE ROD "AND ARM COMBINATION Filed Jan. 6, 1921 Iii/Wm??? Zflzrrm 73,6530

Patented Mar. 6, 1923.

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WARREN NOBLE, 0F PROVIDENCE, RHODE ISLAND, ASSIGNOR TO WILLIAM H.

THORNLEY AND WARREN NOBLE, TRUSTEES, 0F PROVIDENCE, RHODE ISLAND.

RODTAND ARM COMBINATION.

Application filed January 6, 1921 Serial No. 435,365.

To all whom.: it may concern: v

Be it known that I, lVAninsN NOBLE, a sub ject of the'King of Great'Britain, residing at Providence, in the county of Providence and State of Rhode Island, have invented new and useful Improvements in Rod and Arm Combination, of which the following a specification.

The invention here about to be described concerns a combination of a rod and an arm projecting laterally from said rod; the rod being adapted .to be turned about its axis or to be moved cndwise, and the arm serving to transmiti'orce to or from the rod. The object is to effect a connection between the rod and arm which is rigid to prevent rotation or endwise movement of either element relatively to the other and to transmit force and movement without slip from one to the other which involves no-increase in diametcr of the combination at the point of connection between the elements, or any appreciable loss of strength of either member at the point of connection, and which may be accurately made by methods which permit ol quantity production at low cost. These objects are accomplished by forming the arm with what I may call an inside hub which is fittedin a socket in the rod, and by providing in connection therewith a retaining meansfor holding such hub in its socket and binding the material'ofthe rod against the hub. A form of rod and arm combination embodying this invention is described in detail in the following specification and illustrated in the drawings forming a part thereof. In said drawings,

Figure l is an end view of the combi nation.

Figure 2 is an elevation of the combination showing only those parts of the rod and arm in which the essentials of the invention are embodied.

Figure 3 is a longitudii'ial section of the rod on the line 3-3 of Figure 2-.

Figure l. is a longitudinal section of the rod with the arm and retainer removed.

Figure 5 is an elevation of the retainer showing its head in section.

Figures 6 and 7 are plan views of different forms or arm adapted to serve as the arm element of the combination.

Figure 8 is a side elevation of the arm shown in Figure 6.

Like reference characters designate the same parts wherever they occur in all the figures.

In these drawings, a represents a rod having in the end thereof a socket bwith a longitudinal slot 6 in one side, and a threaded 0 extension passage (Z leading from its center. The end of the rod which forms the wall surrounding the socket externally'beveled or chamiered at e, at such an angle that'the pressure exerted by the screw head, presently 5 described, will close in the walls of the socket. An angle of forty-five degrees with the axis of the rod is efi'ective for that purpose:

The arm of the combination is indicated at f (7" in Figure 7). One end of it is shaped to form a hub 9 adapted to slip into the socket b and fit fairly closely therein, and having a central passage 72, to receive the screw. That part of the arm which leads from the hub is of a width adapting it to pass through the slot 0. The arm may be of that same width or thickness throughout its length, as shown in Figure 7, but preferably it is of greater'width beyond the part which occupies the slot and also is cylindrical in form, as indicated in Figures 1, 2, 6, and 8.

In that case the connection between the hub end and the body of the arm may be by a neck '5 of a width substantially equal to that of the slot 0, and on each side of this neck are curved notches y and 71: approximately equal in width to the thickness of the enclosing wall of the socket.

A screw Z, having the end of its shank threaded at m to fit the tapped passage d, is provided to hold the rod and arm in assoeiation. The head 92- of this screw is preferably approximately equal in diameter to the outside diameter of the rod, and the un- 9 der side'ot this head is recessed at 0 and beveled at 7. to fit the ehamfered surface 5 on the end of the rod.

IVhen the arm and rod are assembled, the hub 9 being then in the socket b and the 1 neck 11 or equivalent part of the rod occupying the slot 0, the screw is inserted through the bore h of the hub and into the tapped socket extension (Z. Upon being screwed home, the beveled zone of the screw head bearing on the chamtered edge of the rod, crowds the walls of the socket and of the slot inwardly against the hub and the adjacent neck part of the arm. As these parts are fitted together accurately enough to be without perceptible looseness, the amount of distortion which may be given to the socket walls by the screw head is enough to cause these alls to bind the arm as just described.

The combination of the elements con structed and assembled as described has sev eral highly useful qualities, au'iong which are included the following:

1. The arm isrigidly connected to the rod so that neither can turn relatively to the other about any axis, or slide endwise relatively to the other in any direction.

2. The strength of the rod where it embraces the arm hub is SUl')St21-Dti2lll greatto receive and transmit. torque as is any other part 01 the rod. because by far the greater proportion of the torsional strength of a rod is contained in the material immediately adjacent to its surface.

3. The arm is but slightly weaker at the junction point than elsewhere. because the neck in the arm which passes through the slot in the side of the rod is made thick enough to give substantial strength; because. t'urther the hub is fitted and clamped in the socket without ability to play in any direction; and because, finally. the shoulders of the rod which make the outer boundaries of the notches j and 7c (in the form shown in Figures 1, 2. 6, and 8) are adapted to bear on the outside of the rod and prevent bending of the narrow neck of the arm.

-l.. The. arm neither makes necessary any enlargement of the external diameter of the rod nor causes any excrescence on the rod, as occurs when an arm having an exterior hub mounted upon a rod. Hence this com bination can be used as a rock shaft and operating arm or handle in spaces where there would not be room for a shaft and lever coml'iination having an external hub or collar.

The parts may be made and finished in comparatively few operations. these being of the simplest and least expensive used in metal working. All the operations of drilling, tapping. reaming. slotting. and chamtering performed on the end of the rod to make the socket can be performed in an automatic screw machine. the screw can be made on a screw machine. and the cylindrical bored hub on the end of the arm can be produced by shearing and drilling operations. Hence the combination can be turned out in large quantities at loivcost.

6. The construction described does away with all need of cutting keyways and fitting keys to prevent relative rotation of the parts. These are laborious and expensive operations Among the uses which I have contemplated tor this combination is in a situation where several rotatable rods have to be mounted side by side in a confined space just large enough to admit rods of the diameter.

necessary for adequate strength, butnot large enough to contain a like number of rods having enlargements or external collars. In this or any other location or use an arm 7 on one end of the rod may serve to give rotary or endwise movement to the. rod, and a similarly mounted arm on the other end of the rod may serve to deliver such motion to the part requiring to be moved. The invention may be applied anywhere to any use which requires a rod and an arm rigid with one another for the transmission of motion and. force.

In this combination I have called the hub of the arm an inside hub because. although it serves substantially the uses of an ordi nary hub. it is placed inside the part to which it is connected.

hat I claim and desire to secure by Letters Patent is l. A mechanical combination consisting of a rod having a socket in its end with a slot in one side, said socket being otherwise enclosed by the sides of the rod, an arm having an inside hub fitting said socket and having a neck passing through the slot, and means for retaining the hub in the socket.

2'. A mechanical. combination consisting ot' a rod having a socket in its end with a. slot in one side, an arm having an inside hub occupying said socket and having a neck passing through the slot, and means for clamping the walls of said socket aboutsaid hub.

23. A mechanical combination comprising a rod having a socket. and an arm having an inside hub fitting within said socket, the rodbeing of substantially the same diameter throughout. and being without enlargementat the. socket.

4. A red and arm combination compris ing a rod having a socket in the end with a slot in its side wall, an arm having a hub occupyii'ig said socket and having a neck passing through the slot, and means for springing the alls of the socket and slotin 'ard toward said hub and neck.

rod and arm combination con'iprising a rod having a socket in the end with a slot in its side wall. an arm having a hub occupying said socket and having a neck passing through the slot. and a screw pass ing through the hub into the rod and having a head overlying the rod end. said. head and end having complenumtal beveled Zones adapted to crowd the Wall of the socket illward by driving home of the screw.

6. A rod and arm combination comprising an arm having on one end a substantially cylindrical hub, the axis of which is transverse to the length of the arm, and said hub having a bore, a rod having a socket in one end of a shape and dimensions to receive the hub and having a slot in one side to receive the part of the arm next to the hub, and a retaining screw be passed through the hub and engaged in athreaded extension of said socket, the head of said screw overlying the arm and retaining the hub thereof in said socket.

In testimony whereof I have afiixed my signature.

lVARREN NOBLE.

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