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Title:
Hinged ratchet wrench
United States Patent 2294510
Abstract:
This invention relates to hinged ratchet wrench. An object of this invention is to provide a highly improved hinged ratchet wrench for tightening or taking off bolts and nuts. A further object of this invention is to provide a device of the character described having a pivoted handle which...


Inventors:
Rikio, Nakano
Application Number:
US33781740A
Publication Date:
09/01/1942
Filing Date:
05/29/1940
Assignee:
Rikio, Nakano
Primary Class:
Other Classes:
81/177.7, 81/177.9, 192/43.1
International Classes:
B25B13/46
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Description:

This invention relates to hinged ratchet wrench.

An object of this invention is to provide a highly improved hinged ratchet wrench for tightening or taking off bolts and nuts.

A further object of this invention is to provide a device of the character described having a pivoted handle which may operate at any angle.

Yet a further object of this invention is to provide in a device of the character described, a simple adjusting mechanism to reverse the operation of the ratchet from right to left.

A still further object of this invention is to provide a strong, rugged and durable device of the character described which shall be relatively inexpensive to manufacture, easy to adjust, and manipulate, and which shall yet be practical and efficient to a high degree in use.

Other objects of this invention will in part be obvious and in part hereinafter pointed out.

The invention accordingly consists in the features of construction, combinations of elements, and arrangement of parts which will be exemplified in the construction hereinafter described, and of which the scope of application will be indicated in the following claims.

In the accompanying drawings, in which is shown various possible illustrative embodiments of this invention, Fig. 1 is a side elevational view of a hinged ratchet wrench, embodying the invention, and showing the ratchet and wrench in a position where it is swung ninety degrees with respect to the handle, in dotted lines; Fig. la is a side elevational view of a rod which may be inserted through an opening in the handle of the device shown in Fig. 1, and facilitate rotation thereof when the device is used in a position shown in full lines in Fig. 1; Fig. lb is an extension member which may be used in conjunction with the wrench shown in Fig. 1, to extend the length thereof; Fig. 2 is a side elevational view of the lower portion of the device shown in Fig. 1; Fig. 3 is an enlarged, cross-sectional view taken on line 3-3 of Fig. 2; Fig. 4 is a cross-sectional view taken on line 4-4 of Fig. 3; Fig. 5 is a cross-sectional view taken on line 5-5 of Fig. 3; Fig. 6 is a view similar to Fig. 2, but illustrating a modified construction; Fig. 7 is a view similar to Figs. 2 and 6, but illustrating a still further modified construction; and Figs. 8, 9 and 10 are cross-sectional views of the pawl and ratchet illustrating various modifications of the pawl.

Referring now in detail to the drawings, 10 designates a hinged ratchet wrench, embodying the invention, comprising generally a handle 11 and a reversible ratchet mechanism 12 hinged thereto, as at 13, and carrying a square wrench 14, adapted to fit into a socket.

The ratchet 12 comprises a housing 16 having a lower case portion 11 formed with a bottom wall 18 and an upwardly extending cylindrical wall 19. The bottom wall 18 is formed with a central opening 20 and with a smaller offset opening 21. The cylindrical wall 19 is formed on the inner surface thereof with a radial socket 2 la. A central radial through opening 22 connects the socket with the exterior of the case 1i.

On the case 17 is a cover 24 comprising a bottom wall 25 contacting the upper edge of the cylindrical wall 19, and bolted, screwed or riveted thereto by a plurality of equiangularly spaced fastener members 26 interconnecting the walls 18 and 25.

Wall 25 is formed with an opening 28 aligned with wall 21. Extending upwardly from wall 25 is a boss 29 formed with a horizontal through opening 30. The upper surface of boss 29 is rounded, as at 32, and said rounded surface is formed with a shallow notch 33 at the top, and with similar notches 34 at the sides thereof.

Wall 25 is formed with a central socket 37, aligned with the central opening 20.

Rotatably mounted in the housing 16 is the wrench member 14. The same has a central, upwardly extending axle 40 rotatably received in the bearing opening 31. Member 14 is furthermore formed with an annular portion 42 rotatably received in the opening 20. Between the portions 40 and 42 is a ratchet portion 43 comprising a plurality of spaced teeth 44.

The lower portion 14a of member 14 is square or of any other suitable polygonal shape, and carries a spring pressed ball 46 adapted to snap into a notch in a socket opening into which the portion 14a is inserted.

Rotatably mounted on the housing 16, is a pawl 50. The pawl 50 has axles 51 and 52 journalled in the openings 21 and 28. The axle 52 5o projects above the upper surface of wall 25 and is formed with a kerf 53 so that the pawl may be rotated by a screw driver. The outer surface of the axle 52 is preferably knurled so that the pawl may be rotated by hand. It must be considered that the axle 52 may be made in several different shapes without departing from its operation. Pawl 50 has wings 54 and 55 formed with teeth engaging prongs 54a and 55a.

Slidably mounted in the socket 21a of cylindrical wall 19, is a spring pressed pin 60, adapted to press against the rear of the pawl 50. The pawl has a V-shaped rear portion 62 forming surfaces 62a, 62b at an angle to one another.

When the pawl 50 is in the position shown in Fig. 5 of the drawings, the spring pressed pin 60 presses against the surface 62b. In such position, when the casing 18 is rotated in a clockwise direction, the end or prong 54a will ride over the teeth 44 without turning member 14.

However, when the casing is rotated in a counterclockwise direction, the prong 54a will cause the member 14 to rotate with the casing. Upon rotating the pawl 50 in a clockwise direction, from the position shown in Fig. 5, to bring the prong 54a into engagement with the ratchet, the spring pressed pin 60 will snap onto surface 62a, and in such position, the wrench member 14 can only be rotated in a clockwise, direction.

The handle II has a pair of bifurcated arms I la, straddling the boss 29 and formed with ,aligned openings I .b to receive the hinged pin 13 passing through the bearing opening 30, for hinging the handle II to member 12. Handle II is formed with a horizontal through opening 70 at its upper end, through which a rod 71 may be inserted to operate the device 10 when the handle II is upright or in alignment with the wrench member 14.

In Fig. lb there is shown an extension member 72 having a socket 73 at one end to fit into member 14. The member 14 is provided with a spring pressed ball 46 adapted to snap into a depression in the socket 73 to aid in keeping the extension member 72 in place.

If desired, member 12 may be rotated about hinged pin 13 to the dotted line position shown in Fig. 1, and the handle 11 may be operated in such position without the need for the rod 71.

Of course, the member 12 may be rotated in an opposite direction, relative to the handle 11, so as to be located in a position opposite to the dotted line position shown in Fig. 1.

At the bottom of the handle 11, is a spring pressed ball 78 adapted to snap into the depressions 33 and 34, to retain the member 12 in the 50) positions to which it is moved relative to the handle 11.

The device shown in Fig. 6 varies from the device shown in Figs. 1 to 5, only in that a pair of bifurcated arms 80 extend upwardly from the top 5, wall 25, to receive the lower end 81 of a handle hinged thereto by a transverse pin 83. The lower end 81 of the handle is rounded and is provided with a plurality of depressions 84 to receive a spring pressed ball 86 located between the arms CO 80.

In Fig. 7 the bifurcated arms I !a of the handle I are hinged to pins 13a located on the casing 16.

Otherwise, the structure shown in Fig. 7 is similar to Figs. 1 to 5 of the drawings. In Fig. 8 there is shown a housing 16a, similar to housing 16, with the exception that in the former the pawl 50 is held in one or the other of its alternate positions by a flat strip spring 50a, the ends whereof are engaged in recesses 50b of the housing. The mid portion of the strip spring 50a is bowed and presses against the pawl, as shown in Fig. 8 of the drawings.

In Fig. 9 the ratchet 43a is similar to the ratchet 43, except that it is formed with Vshaped teeth 44a, and the pawl 50c cooperating therewith has V-shaped wings adapted to be received between the teeth.

In Fig. 10 the ratchet 43a is the same as in Fig. 9, but the pawl 50d has wings each formed with a pair of teeth 50e to be received between the teeth of the ratchet 43a.

It will thus be seen that there is provided a device in which the several objects of this invention are achieved, and which is well adapted to meet the conditions of practical use.

As various possible embodiments might be made of the above invention, and as various changes might be made in the embodiments above set forth, it is to be understood that all matter herein set forth or shown in the accompanying drawings is to be interpreted as illustrative and not in a limiting sense.

Having thus described my invention, I claim as new and desire to secure by Letters Patent: A device of the character described comprising a member having a bottom wall and an annular upstanding wall, said bottom wall being formed with a central opening and an opening offset from the axis of said bottom wall, said member being open at its upper end, a second member to close the upper end of the first member, comprising a top wall contacting the upper edge of the upstanding wall, and a boss extending upwardly from said top wall and formed with a horizontal through opening, the underside of said top wall being formed with an axial socket, and said top wall being formed with an opening offset from the axis thereof and aligned with the offset opening in said bottom wall, means for attaching said top wall to said bottom wall, whereby said members form a casing, a third member having a ratchet portion disposed within the casing, and a stem portion projecting through the central opening in the bottom wall, a portion rotatably mounted within the axial opening on the underside of said top wall, a pawl within said casing having axle portions rotatably received within the offset openings of said top and bottom walls, said pawl having wings .adapted to selectively engage -the teeth of said ratchet, said upstanding wall being formed on the inner surface thereof with a recess, a spring pressed plunger within said recess adapted to engage said pawl, to retain -either one or the other of the wings thereof in engagement with the teeth of said ratchet portion, said pawl having a portion projecting above said top wall and formed with a kerf.

RIKIO NAKANO.