US2744432A

US2744432A - Reversible ratchet wrench

Info

Publication number: US2744432A
Application number: US445947A
Authority: US
Inventors: Rueb Theodore Otto
Original assignee: SHERMAN KLOVE Co
Current assignee: SHERMAN KLOVE Co; SHERMAN-KLOVE Co
Priority date: 1954-07-27
Filing date: 1954-07-27
Publication date: 1956-05-08
Anticipated expiration: 1973-05-08

Description

May 8, 1956 T. o. RUEB REVERSIBLE RATCHET WRENCH Filed July 27, 1954 INVENToR. 7Zeodorc @1/cb 4 Byll/ Mud/n ited States Patent O REVERSIBLE RATCHET WRENCH Theodore Otto Rueb, Lincolnwood, lll., assignor to Sherman-Kleve Company,l Chicago, lll., a corporation of f Delaware Application July 27, `1954,-Sel'ial'No. 445,947 4 Claims.Y (Cl. S1-62) struction, relatively simple shifting means being provided for reversing the pawl action.

One object of the invention is to provide a ratcheting device so constructed that it will stand up under hard usage and may be used for a relatively long period of time without undue wear.

Another object is to provide a ratcheting device including a barrel-like driving member and al head-like driven member therein, with ratcheting mechanism interposed between the two and a simple ratchet shifting means being provided in the forni` of a leaf spring engageable with opposite pawls. The d'evicefisA adjustable for rotation in either direction by a selector disk at one end of the barrel, means being provided at the other end of the barrel for engaging the work, such as a wrench socket or the like for nuts' and bolt heads,4 etc. l

Still another object-is'to provide a construction wherein the head is amply supported for rotation in both ends of the barrel by meansof a flange onone end of the head, and a bearing washer at' the other end thereof which is pinned with respect to the head so as to rotate therewith and thereby provides a bearing surface in the barrel at the periphery of the bearing washer. j

A further object is tov provide a simple pawl arrangement wherein the pawls'a're provided with rounded ends forming rocker-type pivots that are received in notches of the head, which notches form rocker seats therefor and thus'provide a rugged support'for' thepawls without the necessity of providing pivot pinsand the like as in usual ratchet and pawl constructions.

Still a further object` is to provide pawl shifting faces on the pawls with whichv the ends of a' leafspring may be engaged in such manner that the engagement is outsidethe pivotal center of one'pawl' and insidethepivotal center. of the'other, and' may be shifted in the opposite direction to effect reversal of the Vratcheting action, a selector disk being providedy for this purpose designed to be given partial rotative movementrelative to the head and preferably in the direction that it is desired to rotate the work. A

An additionalobject is to provide an over-center snap mechanism for the spring,.lso that itwill be thereby retained in either of its adjusted positions once it is adjusted thereto, accidental change in the adjustment being thereby v minimized.

Fig. 2 is an enlarged vertical sectional view through the barrel end of the wrench with portions thereof left Vin side elevation. y

Fig. 3 is a horizontal sectionalview on the line: 3--3 of Fig. 2 showing the'wrench' adjusted for counterclockwise rotation. n

Fig. 4 is a fragmentary View' of a portion of Fig. 3

showing the upper pawl during the ratcheting operation; y

and

Fig. 5 is an explodedperspective view of th'efparts` of the wrench to illustrate details and the assembly of the parts; j

On the accompanying drawing I' have used. the reference numeral .10 to indicate adriving member in the form of a barrel or cylinder. A lever arm 12 extends therefrom and terminates in a handle 14 for convenience in manually rotating the driving barrel 10.v The barrel 1t) is provided with inwardly projecting ratchet teeth 16 centrally located between the `upper and lower ends of the barrel. i

A driven member in the form of a head 18 is rotatably mounted in the barrel 10 and has a flanged portion 24 rotatably engaged with a counter-bore 20 at the upper end of the teeth 16 (see Fig.".2) which counter' bore serves as a journal or bearing therefor. A bearing washer 26 is mounted on a reducedshank 34 of the` head' 18 and rotates in another counter bore/22 in the lower end of the barrel below the ratchet teeth. To insure rotation of the bearing washer 26 with'V the vhead 18 I providefa pin 23u/Ilich has a press tit into a socket 30Y in the hfead and a loose iit in a perforation 32- of the washer l262 ,Thereby the counter bore 22 serves as a second bearing for the head 1S, both 2l) and 22 being of relatively large diameter to minimizewear in the operation of thetooli The operating life ofthe tool is thereby considerably exitended. vTo retain the' bearing washer 26 in positioiL-l provide a spring retainer or C washer 36located in a groove 3S in the shank 34. f

For operative interposition between the head 18 `and the ratchet teeth 16 of the barrel 10 I provide a counterclockwise pawl 40 and a clockwise pawl 42.'

Thepawls

40 and 42 have rounded ends 44 which serve, asrockers or pivots. Theserounded ends are seatedin rocker vor pivot seats 46 which are notches in the head 1Sfand located at opposite 4sides thereof (upper andrlower sides as shownin'Fig. 3). f v

Each pawl is provided with a spring shoulder or pawl shifting'face 48 with which faces the ends of a generally V-shaped leaf spring 50 engage. These ends; are hooked as indicated at 52 for smoothness of action andthe spring is so diminsioned thatv when it is shifted clockwise relative to the head 18 as shown in Fig, 3, the upper spring end 52 will engage the pawl shiftingr face 48 of the pawl 42 outwardly of its pivot center while the lower spring end 52 will engage the pawl shifting face 48 of the pawl 40 inward of its pivot center.

It will be noted that the spring 50 has a central hump 54 which is above a projection 58 that l provide extending from the internal diameter of a counter bore S6 in the ange 24, which counter bore provides a socket forl reception of the spring 50. yThe projectiony 58 serves to provide over-center snap action so as to retain the spring 5t) either in the position shown in Fig. 3 orrin an oppof site position rotated counter-clockwise relative thereto with the hump 54 on`the lower side of the projection 58. v

A plate-like reversingy member or selector disk 60 is provided for reversing the pawl action. It is retained n position by a shouldered screw 62 and a tension washer 63, the screw having a threaded portion entering a tapped center hole 65 in the head 18. The disk 60 has a hub 64 surrounding the screw 62 and a pin 66 forms a projection which extends from the lower surface of the disk 3 and terminates within the hump 54 of the spring 59 as shown in Figs. 2 and 3. On its outer surface the disk 60 is provided with an actuating wing or finger piece 63 whereby the disk may give partial rotative movement for selecting the direction of rotation of the head 18 within the barrel 10.

The head 18 is provided with a wrench socket shank 72 for engagement with work to be turned or with some intermediate element, such as a socket member 74. Obviously, interchangeable socket members 74 will adapt the one ratcheting device disclosed to a plurality ot different sized nuts or bolt heads, etc., the sockets 76 of the various members 74 being of different size.

Practical operation In the operation of my ratcheting device, assuming the parts to be in the position shown in Fig. 3, the disk 60 has been rotated clockwise for effecting rotation of the head 18 also clockwise (intermittently) as the lever arm 12 s oscillated. It will be noted that the counterclockwise pawl 40 is held inoperative because the iower hooked end 52 of the spring 50 is inward of the pivotal axis thereof where it engages the pawl shifing face 43, thereby swinging the pawl 40 clockwise to its limit of motion, whereas the upper hooked end of the spring is outward of the pivot axis of the clockwise pawl 42 to bias it into engagement with the ratchet teeth 16. Accordingly, as the barrel is rotated counter-clockwise, as indicated by the arrow 70 in Fig. 4, the ratchet teeth 16 will ratchet past the pawl 42. Upon subsequent clockwise rotation of the barrel the teeth will engage those of the pawl 42 for rotating the head 1S clockwise.

When it is desirable to reverse the ratcheting action it is merely necessary to rotate the selector disk 6i? counter-clockwise, whereupon the clockwise pawl 42 will be held inoperative and the counter-clockwise pawl 40 will be held operative. During this selecting action the projection or pin 66 of the selector disk moves the hump 54 of the spring 50 counter-clockwise past the over-center snap projection 58, whereupon the spring 5@ will be held in the counter-clockwise position until the selector disk is again adjusted to the opposite position.

From the foregoing specification it will be obvious that I have provided a ratcheting device wherein there is relatively simple pawl mechanism involving but few parts and eliminating such parts as pivot pins for the pawls. A single spring of special shape coacts with shifting faces of the pawls and is readily operated by an oscillatable selector disk. The parts are all susceptible of ready fabrication on automatic machines, and the pawls themselves may be formed of extruded metal, lengths of which are cut to provide the individual pawls and a notch cut in one end of each pawl to provide the pawl-shifting face 48.

The various parts can be economically machined and the resultant assembly is very rugged in construction and has long-wearing qualities, both as to the rotation of the head within the barrel and as to the pivoting surfaces of the pawls in relation to the rocker seats of the head, resulting from ample bearing surfaces and other obvious design characteristics as above pointed out. While some changes may be made in the construction and arrangement of the parts of my ratchet wrench without departing from the real spirit and purpose of my invention, it is my intention to cover by my claims any modified forms of structure or use of mechanical equivalents which may reasonably be included within their scope.

I claim as my invention:

1. A ratchet wrench including an annular member having a cylindrical bore provided with ratchet teeth, a turning head rotatably mounted in said bore and having a socket therein, opposite rocker seats adjacent the periphery thereof, pawls for coaction with said teeth and having rounded ends seated in said rocker seats, said pawls being provided with pawl shifting shoulders which extend diametrically across said rounded ends, a leaf spring having its ends resting on said shoulders and its central portion located in said socket, a selector disc covering said socket and designed to be given partial rotative roi/ement relative to said head, said selector disc having a projection engaging said central portion of said spring to shift one of said ends inwardly and the other end thereof outwardly relative to said shoulders for rendering one of said pawls ineffective and the other effective rcspectively, or vice versa upon opposite partial rotative movement of said selector disc, said socket having a radially inward projection past which a portion of said sprin(Y snaps to retain said spring in either of said positions and a shank on said head for rotating a wrench socket or the like.

2. In a wrench, the combination with a handle, of a cylinder provided with an annular series of teeth therein, and spaced from the ends thereof, a head for engagement with wrench sockets or the like and having n ange surrounding the same which is rotatably mounted in said cylinder at one end of said teeth, pawls niountet in said head and having outwardly disposed engaging portions for engagement with said teeth whereby said head may be turned in opposite directions, a spring mounted in said head and cooperable with said pawls to render one operable and the other inoperable, or vice versa, a bearing washer rotatable with said head at thc other end of said teeth and closing one end of said cylinder, a selector disk adjacent said tlange of said head and closing the other end of said cylinder, a projection from said disk engageable with said spring to shift it in one direction or the other to hold one pawl or the other in ratcheting position and the other inoperable, and means to retain said bearing washer in position on said head with said ilange adjacent one end of said teeth and said bearing washer adjacent the other end thereof.

3. In a ratchet device of the character set forth, the combination of a driving member comprising a cylinder having inwardly extending teeth, a driven member comprising a head rotatably mounted in said cylinder, means for holding said head in said cylinder, a pair 0f pawls carried by said head for coaction with said teeth of said cylinder, said pawls being pivoted in said head and each having a face extending across its pivot axis and having portions thereof located on opposite sides of said pivotal axis, a spring engageable with said faces and adjustable to two different positions, one in which it engages the portion of the face of one pawl inward of its pivotal axis and the other outwardly thereof, and vice versa, a disk designed to be given partial rotative movement relative to and mounted in said cylinder adjacent said pawls and having an off-center projection engageable with said spring to shift the same when the disk is partially rotated in one direction or the other relative to said head, means for holding said disk in engagement with said head, a wing on said disk for partially rotating the same and thereby selecting the direction of rotation of the work rotated by said ratchet device, and over-center means to retain said spring in its respective operating positions of adjustment.

4. In a manually operable ratchet tool, the combination of a barrel having interior ratchet teeth centrally located to provide cylindrical portions on opposite sides of the teeth for bearing surfaces, a driven head member rotatably mounted in said barrel with a portion thereotr journalled in one of said cylindrical portions and having work engaging means, said head member having oppositely arranged rocker notches in its periphery, rockably mounted pawls in said rocker notches and having tint shoulders passing substantially through their rocker axes, a V-shaped spring having its ends engaging said shoulders and being so dimensioned as to engage one of the shoulders inside of the rocker axis of its pawl and the other outside the rocker axis of the other pawl when the spring is in one position or vice versa when in the other position, a selector disk designed for partial rotative movement, mounted in one of said cylindrical portions and having an off-center projection engageable with the apex of said spring for shifting it from one position to the other, and a bearing washer in the other of said cylindrical portions having said head member bearing therein and its periphery bearing in the other of saidcylindrical 5 portions.

References Cited in the le of this patent UNITED STATES PATENTS Petticrew Sept. 25, 1883 Bancroft July 16, 1912 Hitt Apr. 29, 1913 Dodge June 4, 1935 Rueb Dec. 28, 1937 Rueb Jan. 30, 1940 Fish Dec. 18, 1951