US1486921A - Ratchet wrench - Google Patents

Description

Panarea an?. is, raza.

man

einen RAYMOND REISS, F BOSTON, MASSACHUSETTS.

RATCHET VIR-ENCE.

Application filed September 28, 1922. Serial No. 591,145.

useful Improvements in Ratchet Vrenches,

of which the following is a specification.

' This invention relates to wrenches and has special reference to a ratchet wrench.

One important object of the invention is to improve the general construction of wrenches of this character.

A second important object of the invention is to provide an' improved ratchet mechanism for such wrenches.

A third important object of the invention is to provide a novel form of ratchet mechanism controlling a pair of pawls, the ratchet controlling mechanism being arranged to exert spring pressure on one or the othei` of said pawls in a novel and improved manner.

A fourth important object of the invention is to provide an improved adjusting means for regulating the size of the jaw opening in such a wrench.

With the above and other objects in view as will be hereinafter apparent, the invention consists in general of certain novel de- 50 tails of construction and combinations of parts hereinafter fully described, illustrated in the accompanying drawings and specifically claimed.

In the accompanying drawings like characters of reference indicate like parts in the several views, and

Figure 1 is a side view of the wrench constructed in accordance with this invention.

Figure 2 is a plan view of the wrench with the cover plate removed.

Figure 3 is a section on the line 3-3 of Figure 2.

This wrench is constructed with a body having a cylindrical upper portion 10 and a frusto conical lower portion 11. From the size of this frusto conical lower portion depend guides 12 which are provided with longitudinally extending slots 13. These slots are so arranged that the material beyond the slots forms ribs 14. Slidably mounted between the guides 12 is a pair of jaws 15 each of which is provided with ribs 16 moving in the slots 13 and with slots 17 receiving the ribs 14. One of these jaws has a right hand screw thread opening 18 while the other has a left hand screw thread opening 19 `and through these openings eX- tend a right and leftv handed screw 2O having a centrally disposed worm wheel 21 which is engaged by a worm 22 mounted on a shaft 23 which projects outwardly through one of the guides 12 and is provided on its outer end with a thumb nut 24 by means of which it may be turned. Thus, rotation of the thumb nut 24 moves the jaws 15 toward, or from each other, according to the direction of such rotation. Mounted on the portion 10 of the wrench head, or body, is a ring 24 having a handle 25 projecting radially therefrom. This ring 24 is held in position by a covervplate 26 having an eccentrically Adisposed screw threaded boss 27 projecting from its under side and engaging in a suitable threaded opening in the head 10. In that portion of the handle which lies next to the ring 24 there is provided a recess 28 and in this recess is pivoted, on a pin 29, a pair of independently movable pawls 30 which are selectively engageable in a ratchet ring 31 formed in the head 10. These pawls are normally pressed away from the ratchet ring by a spring 32 which is mounted on a pin 33 in the recess 28. Pivoted on a pin 34 is a T-shaped lever having oppositely disposed arms 35, which carry springs 36 each bearing on a respective pawl 30. The springs 36 are formed integralwith or secured to the arms 35 in any desired way. Extending' from the head formed by the arms 35 is a stem 37 having a projection 38 working over a ratchet rack 39 formed in the bottom of a recess of an eX- tension 40 to the recess 28. By this means movement of the stem 37 in one direction or the other brings a respective spring 36 into forcible engagement with a respective pawl 30 and at the same time relieves the pressure on the other pawl. By reason of the relative strength of the springs 32 and 36 one of these pawls is forced inward to engage the ratchet ring while the other is freed from said ratchet ring. When the stem is in the central position both pawls will engage with the ratchet ring since the pressure of the springs 36 will be, in this position, suiicient to overcome the resistance of the spring 32.

Thus, the handle can be set to move the head when moved in either direction or can be set to intermittently rotate the head in a single direction.

There has thus been provided a simple and eicient device of the kind described and for the purpose specified.

It is obvious that ininor changes inay be inade in the forni and construction of the invention Without departing froin the inatcrial spirit thereof. It is not, therefore, desired to confine the invention the exact forni herein shown and described but it is desired to include all such as properly come within the scope claimed.

Having thus described the invention what is claimed as new, is

ln a ratchet wrench, a head having a ratchet ring, a handle oscillatable about said head, a pair of independently movable paWls pivoted to said handle and engageable with the ratchet ring, a spring urging said fiawls awa from said riiw a T-sha ed lever pivoted to said handle at the junction of its head and stein, said head extended with its arins opposite respective pawls, springs each fixed to one arin of the head and bearing aga-inst a respective pawl, a lug projecting downwardly froni the stein, and a ratchet seginent formed on the handle and having said lug engaged therewith.

In testimony whereof I aiiix my signature in presence of two witnesses.

RAYMOND Rinse;

Witnesses: Y

Mrs. CHARLES H. MOORE, CHARLES H. MOORE.

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