US2376575A

US2376575A - Ratchet wrench

Info

Publication number: US2376575A
Application number: US463153A
Authority: US
Inventors: James E Cronan
Original assignee: Individual
Current assignee: Individual
Priority date: 1942-10-24
Filing date: 1942-10-24
Publication date: 1945-05-22
Anticipated expiration: 1962-05-22

Description

J. E. CRONAN RATCHET WRENCH May 22, 1945.

Filed Oct. 24, 1942 2 Sheets-Sheet l 7 HH in-----.

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May 22, 1945- J. E. cRoNAN 2,376,575

T WRENCH Filed Oct. 24, 1942 2 Sheets-Sheet`2 Fatented May 22, 1945 UNITED STATES PATENT OFFICE.

y 2,376,575 nA'roHE'r WRENCH James E. Cronan, Howell, Mich.

` Application October 24, 1942-, Serial No. 463.153

(ci. lez-43.2)

4 Claims..

This inventionrelates to wrenches and has for its object to provide an improved type wrench which will ratchet in either direction, which has a neutral locking position and which can be made to coast freely from any position.

Another object is to provide a ratchet wrench having jaws which can be readily and quickly converted to any one of a variety of sizes in order to accommodate the heads of various bolts or nuts.

In some assembly operations which have confronted applicant it is necessary for the wrench to be removable from the nut or bolt head in a certain angular position. In one Iparticular case this wrench reduced the assembly time from thirty minutes to five minutes. The angle was such that two sets of ratchet pins were necessary. It is therefore another object of the invention to provide a ratchet wrench having forward, reverse, neutral or coasting settings and locked position so as to make wrench into solid head type and also having two sets of ratchet pins, one on either side of the wrench center line in order to accommodate more difficult requirements such as above noted.`

Other objects and advantagesV will hereinafter become more fully apparent as reference is had to the accompanying drawings in which my in vention is illustrated and in which Figure 1 is a top or bottom elevation of my improved wrench,

Figure 2 is a vertical section taken along the line 2--2 of Figure 1,

Figure 3 is a top or bottom elevation of the control cam,

Figure 4 is a transverse longitudinal section of the jaws of the wrench taken along the line 4-4 of Figure 5,

Figure 5 is an end elevation of the jaws looking to the right in Figure 4,

Figures 6 and 7 are elevational views taken 90 apart of the locking pin, and

Figures 8 and 9 are elevational views taken at the side and end respectively of an insert for the jaws of Figures 4 and 5.

More particularly, I indicates the main wrench body which consists of a handle 2 and an integral arm or jaws 3 describing the arc of a circle having a total length substantially greater than 180. The handle 2 has a plurality of openings 4 therethrough by which a handle extension (not shown) may be bolted thereto. The jaws 3 have a recess 5 formed on the arc of a circle of greater radius than that of the inside surface 5 of the jaws 3. In this recess 5 a cam 1 slidably fits. The cam 1 is individually illustratedv in Figure 5 and is provided with four camming depressions 8', 9, I0 and II.

The ratchet member I2, separately illustrated in Figures 4 and 5, has an exterior surface serrated at I3 and formed on the arc of a circle having a radius slightly less than that of the inside surface 6 of the jaws 3. A vnotch 29 is provided centrally of the exterior surface for latching purposes. The inside of the member I3 is possibly best described as being the shape of a hexagon with two adjacent sidesremoved. The member is then capable of application to a bolt head or nut to engage either two or four sides thereof depending upon whether the bolt head or nut is square or hexagonal.

The' cam 1 is assembled in the groove 5 and the ratchet member is then placed in the jaws 3 with the serrations being adjacent the surface 6, as illustrated in Figure 1. In order to maintain these three members in assembly I provide two retaining plates I5 which are secured to the member I by screws I6. One of the retaining plates has a curved slot I1 centrally thereof through which a pin I8 projects. This pin is anchored at one end to the cam 1 and at its other end to a nger button I9 so that the cam may be shifted in its groove 5 to the extent of the length of said slot I1. The cam has three dents or dimples 20 near one end thereof to receive a spring pressed ball mounted in the member 3, not clearly shown but similar to the balls 35 carried by the member I2. The cam is thus restrained in one of three selected positions.

Engaging the teeth or Aserrations I3 of the ratchet member are four

pawls

22, 23, 24 and 25 arranged in pairs at opposite sides of the center line of the wrench with the members composing each pair set substantially at from each other. These pawls are carried by the main member I .and are each urged inwardly thereof by a spring 26 held in place by a screw 21. Transversely of each

pawl

22, 23, 24 and 25 is a pin 28 which engages the outside or cam surface of the cam 1. When the cam 1 is set at its central position with the retaining ball in the central one of the dents 20 the pins 28 each ride upwardly on their respective cams 8, 9, IIJ or I I and the ratchet member I2 is freely rotatable. `When the cam 1 is pushed by the button I9 in clockwise direction to the position shown in Fig. 1 the pins 28 ride downwardly on the camming surfaces 8 and I0 so that the two

pawls

23 and 25 travel into the path of a serration I3. Thereupon if the wrench is in engagement with a bolt head and the handle 21s moved downwardly, as viewed in Figure 1, the bolt head will be turned and as the handle 2 is reversed in direction the cam 1 will remain in position with respect to the member I,'the ratchet member I2 will retain its position on the bolt head and the

pawls

22 and 25 will be moved to retracted position against their respective springs 26 thus odering no substantial resistance to the relative movement oi' the members I and i2.

If the button I9 is moved to its third position the camming surfaces 9 and II will permit the other two pawls 22 and 24 to extend in the path of serra-tions I3, the

pawls

23 and 25 being removed from contact therewith so that an upward movement of the handle I, as viewed in Figure 1, will cause rotation of the bolt head by the ratchet member I2 but reverse movement of the handle 2 will resul-t only in movement of the member I.

When the ratchet member is positioned centrally of jaws 3 the notch 29 formed in the mid portion of the outer surface thereof, is in alignment with a plunger or pin 30 carried by the member I and urged by a spring 3|. The plunger I is retained in retracted position by a set screw l2 and upon release, engages the slot 29 so that the ratchet member I2 turns with the handle I in either direction.

The two innersides of the member I2 adjacent the missing sides of the hexagon are preferably provided with grooves Il for the reception of tongues of hard metal inserts, one of which is illustrated at 34. 'I'hese inserts each have at least three sides and where the jaws are in the form of four sides of a hexagon, as illustrated in Figure 1, they have four sides, the same number of sides as the ratchet member. A set of such inserts is provided of varying wall thickness so that any size bolt head or nut may be accommodated merely by a proper selection of insert.`

, The grooves 3l have a spring pressed ball 35 along their length for engagement with a dent or,

dimple II in the tongues of the inserts.

The invention is susceptible of variations and modifications and I desire to be extended protection within the scope of the appended claims.

What I claim is:

i. A ratchet wrench comprising a handle havtwo sets of pawls carried by said jaws, the sets being located on opposite sides of said handle, said ratchet member having ratchet teeth for engagement by said pawls, each of said pawls being spring pressed towards said ratchet member and the pawls of each set being angularly disposed with respect to each other, said cam when in one extreme position elevating one pawl of 'each set out of engagement with said ratchet member whereby said ratchet member may be rotated in one direction with respect to said jaws and when said cam is moved to its other position the other pawl of each set is elevated out of engagement with said ratchet member for rotation of said ratchet member in opposite direction.

2. A ratchetwrench comprising a handle having arcuate jaws integral therewith, a ratchet member iltting into said jaws and rotatable with respect thereto, said jaws having an arcuate recess spaced from the surface thereof which receives said ratchet member and a cam member residing in said recess and slidable to a neutral ing arcuate jaws integral therewith, a ratchet F member iltting into said jaws and rotatable with respect thereto, said jaws having an arcuate rer cess spaced from the surface thereof which receives said ratchet member and a cam member residing in said recess and slidable to a neutral intermediate position or to alternate extreme positions, cover plates secured to said jaws and maintaining said jaws, said cam and said ratchet member against disassembly while permitting relative rotative movement thereof, one of said cover plates being slotted, a pin secured to said cam at one end projecting through the slot and having a anger button mounted on its other end, and

intermediate position or to alternate extreme positions, cover plates secured to said jaws and maintaining said jaws, said cam and said ratchet member against disassembly while permitting relative rotatitve movement thereof, one of said cover plates being slotted, a pin secured to said cam at one end projecting through said slot and having a nger button mounted on its other end, and two sets of pawls carried by said jaws, one of said sets residing on one side of the center-line of the wrench and lthe-other set on the other side thereof, each pawl of each of said sets forming an angle of approximately with the other pawl of the same set, said pawls eachbeing spring pressed toward said ratchet member, said cam upon movement to one extreme position elevating one pawl of each of said sets out of engagement with said ratchet member, whereby said ratchet member may be rotated in one direction by the other pawls, said cam upon movement to its other extreme position elevating the other pawl of each of said sets out of engagement with said ratchet member whereby said ratchet member may be rotated in the opposite direction in said handle and said cam upon movement to neutral position maintaining all of said pawls out of engagement with said ratchet member for full rotation of said ratchet member in said jaws.

3. The combination as set forth in claim 2 together with means to. lock said ratchet member with respect to said jaws when in central position.

4. The combination as set forth in claim 2 together with a plunger carried by said jaws and spring pressed toward said ratchet member, said ratchet member having-a notch to receive said plunger, and a linger button for withdrawing said plunger' from engagement with said notch.

JAMES E. cRoNAN.