Patent Application
20200282532
The present invention relates to hand tools, and more particularly to ratcheting socket wrenches for driving fasteners.
Ratcheting socket wrenches (also known as “ratchets”) are well-known hand tools commonly used to tighten and loosen fasteners, such as bolts, nuts, screws and other rotary fastening elements. A typical ratchet has a ratchet head that houses the ratchet mechanism and a handle that extends from the ratchet head to provide a lever for operating the ratchet head. In many cases, the ratchet mechanism includes a standardized drive that is capable of receiving interchangeable drive components, such as various sockets configured to engage fasteners of different sizes and shapes. In most conventional applications, the ratchet drive is a square drive with a standard drive size, such as ¼″, ⅜″ ½″, ¾″ and 1″. In typical applications, the handle of the ratchet extends a substantial distance from the ratchet head to provide a long lever for applying higher levels of torque. However, some ratchets do not include an extended handle. For example, a variety of palm ratchets have been developed for use in applications where less torque is required. A conventional palm ratchet includes a circular or palm shaped housing that is situated about the ratchet mechanism. In use, an individual can grip the housing in the palm of one hand to rotate the palm ratchet.
As a practical matter, fasteners can be disposed in locations that make it difficult to use a conventional straight-handle ratchet to rotate the head of the fastener. For example, in the context of an automobile, a fastener may be located in the engine compartment within a narrow opening that provides limited physical access to the head of the fastener. In some cases, the confines may be such that it is not possible to fit a conventional straight-handle ratchet onto the fastener. Even when it is possible to fit the ratchet onto the fastener, it may be difficult or impossible to move the ratchet handle through the range of motion needed to articulate the head of the fastener. To address this issue, a variety of ratchets with handles and ratchet heads of different shapes and sizes have been developed. For example, some conventional ratchets have a handle that extends at a fixed angle to the ratchet head. These types of ratchets are often referred to as “offset” ratchets. As another example, some conventional ratchets include a handle that is affixed to the ratchet head at a joint or hinge that allows the angle of the handle to vary with respect to the ratchet head, thereby allowing the position of the handle to be moved to the angle most convenient for use.
One specialized form of flex ratchet is designed to allow the ratchet head to fold inside an opening defined in the handle so that the flex ratchet can be used with an extended handle or with a folded handle. To facilitate this capability, the handle is somewhat oval shaped and broad, and defines an open interior space of appropriate size to receive the ratchet head. The hinge point is aligned with the longitudinal extent of the ratchet head and the handle. This ratchet configuration is bulky and oversized and has not been accepted commercially and does not currently appear to be available on the market. As a result, there remains a need for a more practical flex ratchet that is capable of folding into a compact shape suitable for use as a palm ratchet.
The present invention provides a flex ratchet in which the handle and ratchet head are joined by a hinge that is offset in a manner that allows the handle to be moved between an extended-handle position for applying greater torque and a folded position for providing a compact ratchet that is easily operated as a palm ratchet, typically with even better leverage and function than a conventional palm ratchet.
In one embodiment, the ratchet head includes a body that seats the ratchet mechanism and a neck that extends from the body. The neck may have a remote end that is pivotally joined to the handle at the hinge. In one embodiment, the neck is configured so that the hinge is offset rearwardly from the body of the ratchet head so that the handle is capable of folding over the ratchet head into a compact position in which the handle extends generally parallel to the rearward surface of the ratchet head. In one embodiment, the neck is somewhat L-shaped with a longitudinally extending segment and a rearwardly extending segment.
In one embodiment, the ratchet head and the handle each have a longitudinal extent and the hinge is configured so that the longitudinal extent of the ratchet head is offset from the longitudinal extent of the handle when the handle and ratchet head are oriented parallel to one another.
In one embodiment, the hinge includes a clevis and neck assembly. In one embodiment, the handle defines a clevis, and the neck of the ratchet head is fitted into and joined with the clevis by a pivot pin. The pivot pin extends through both legs of the clevis. The pivot pin may be secured to the clevis in any suitable manner, such as a friction fit, threaded fit and/or adhesive. In alternative embodiments, this configuration of the hinge may be reversed with the ratchet head including the clevis and the handle including the neck.
In an alternative embodiment, the offset may be incorporated into the handle rather than the ratchet head. In this embodiment, the handle includes an angled neck that extends at an angle to the general longitudinal extent of the handle. The neck is of appropriate length to allow the handle to fold generally flat against and parallel to the rearward surface of the ratchet head.
In one embodiment, the length of the ratchet head and the length of the handle are selected to optimize the balance of the ratchet. In one embodiment, the handle is no more than about 50% longer than the ratchet head. In another embodiment, the length of the handle is selected such that the ratchet drive is offset from the center of the length of the handle when in the folded position.
The present invention provides a simple and effective flex ratchet that not only provides the benefits of an extended-handle flex wrench, but also folds into a palm ratchet configuration for use when there is minimum access. The present invention provides an elegant solution that has evaded those who have attempted to provide similar functionality in the past. The unique offset hinge arrangement of the present invention allows the flex ratchet to operate effectively in both extended and folded configurations. When the handle is extended, the offset in the ratchet head positions the handle above (or away from) the head of the fastener, which can facilitate movement of the handle in many situations that involve limited access to the head of the fastener. The ratchet head, offset hinge and handle are configured to provide improved functionality in both the extended and folded positions. For example, the position and amount of offset in the ratchet head may be selected to correspond with the size (e.g., diameter) of the handle so that, when folded, the handle lies generally flat along and extends generally parallel to the ratchet head. Further, the handle length and hinge location may be selected so that, when the handle is folded, the ratchet drive is offset from the center of the length of the handle to provide a longer lever arm. These features help to improve the balance and operation of the ratchet when used as a palm ratchet.
These and other objects, advantages, and features of the invention will be more fully understood and appreciated by reference to the description of the current embodiment and the drawings.
Before the embodiments of the invention are explained in detail, it is to be understood that the invention is not limited to the details of operation or to the details of construction and the arrangement of the components set forth in the following description or illustrated in the drawings. The invention may be implemented in various other embodiments and capable of being practiced or being carried out in alternative ways not expressly disclosed herein. In addition, it is to be understood that the phraseology and terminology used herein are for the purpose of description and should not be regarded as limiting. The use of “including” and “comprising” and variations thereof is meant to encompass the items listed thereafter and equivalents thereof as well as additional items and equivalents thereof. Further, enumeration may be used in the description of various embodiments. Unless otherwise expressly stated, the use of enumeration should not be construed as limiting the invention to any specific order or number of components. Nor should the use of enumeration be construed as excluding from the scope of the invention any additional steps or components that might be combined with or into the enumerated steps or components. Any reference to claim elements as “at least one of X, Y and Z” is meant to include any one of X, Y or Z individually, and any combination of X, Y and Z, for example, X, Y, Z; X, Y; X, Z; and Y, Z.
A folding flex ratchet 10 in accordance with an embodiment of the present invention is shown in
The present invention is described with reference to drawings of a folding flex ratchet suitable primarily for use with standard ¼″, ⅜″ and ½″ square drives. The ratchet 10 is intended to interchangeably receive conventional sockets and other conventional drive components configured to interfit with the standardized ratchet drive. It should be noted, however, that the present invention may be readily adapted for use with ratchets of different sizes and with different types of drives. Directional terms, such as “vertical,” “horizontal,” “top,” “bottom,” “upper,” “lower,” “inner,” “inwardly,” “outer” and “outwardly,” are used to assist in describing the invention based on the orientation of the embodiments shown in the illustrations. The use of directional terms should not be interpreted to limit the invention to any specific orientation(s).
As noted above, a ratchet 10 manufactured in accordance with the present invention is shown in
The ratchet head 12 of the illustrated embodiment generally includes a body 18 and an extended neck 24. The body 18 has a forward surface 70 and a rearward surface 72, and defines a ratchet opening 22 configured to seat a ratchet mechanism 26. The ratchet mechanism 26 is fitted into the body 18 from the forward surface 70, but includes components that extend through and are accessible from the rearward surface 72. The ratchet mechanism 26 is secured in the body 18, for example, by a snap ring (not shown). In the illustrated embodiment, the ratchet mechanism 26 is a generally conventional ratchet mechanism 26 with a ratchet drive 28 that extends from the forward surface 70 of the ratchet head 12 and an internal mechanical arrangement that provides ratcheting operation of the ratchet drive 28. The illustrated ratchet drive 28 includes a conventional ¼″ square drive configured to be selectively fitted with interchangeable drive components, such as sockets and other drive components. The present invention can, however, be readily incorporated into ratchets with drives of other sizes, shapes and types. For example, the ratchet 10 may include a square drive with essentially any standard drive size, such as ¼″, ⅜″ and ½″. The illustrated ratchet mechanism 26 is selectively operable in a first mode in which the ratchet drive 28 is driven in a clockwise rotation and a second mode in which the ratchet drive 28 is driven in a counterclockwise rotation. The illustrated embodiment, the ratchet mechanism 26 includes a toggle switch 30 disposed on the rear surface of the ratchet head 12 where it is movable by the user to select clockwise or counterclockwise drive operation (See
As noted above, the ratchet head 12 includes an extended neck 24. In this embodiment, the neck 24 is configured to provide an offset mounting point for the handle 14. The offset is selected to allow the handle 14 to fold generally flat against the ratchet head 12 and to center the folded handle 14 roughly over the ratchet head 12. As perhaps best shown in
In the illustrated embodiment, the handle 14 includes an elongated shaft 60 with a clevis 62 at one end. In this embodiment, the shaft 60 is generally circular in cross-section and, as noted above, varies in cross-sectional diameter along its length. The clevis 62 is configured to form part of the hinge 16. In this embodiment, each leg of the clevis 62 defines a hinge pin opening 66. The hinge pin openings 66 extend laterally and are aligned with one another. More specifically, in this embodiment, the neck 24 is fitted into the clevis 62 and is joined with the clevis by a hinge pin 64. The hinge pin 64 extends through the hinge pin openings 66 in both legs of the clevis 62 and through the hinge pin opening 54 in the neck 24. The hinge pin 64 may be secured to the clevis 62 and/or the neck 24 in any suitable manner, such as a friction fit, interference fit, threaded fit and/or adhesive. For example, one or both of the hinge pin openings 66 in the clevis 62 may be internally threaded and the hinge pin 64 may be externally threaded so that the hinge pin 64 can be secured by a threaded engagement. In alternative embodiments, the configuration of the hinge 16 may be reversed with the ratchet head 12 including the clevis and the handle 14 including the neck. The clevis and neck arrangement of the illustrated embodiment is merely exemplary and the ratchet head 12 and handle 14 may be pivotally joined by alternative arrangements.
The relative sizes of the ratchet head 12 and the handle 14 may be selected to optimize the balance and function of the ratchet 10 in both the folded and extended positions. In the illustrated embodiment, the handle 14 is no more than about 20% longer than the ratchet head 12. For example, in the context of a ratchet 10 for a ¼″ or ⅜″ square drive, the ratchet head 12 may have an overall length of approximately 65 mm and the handle 14 may have an overall length of approximately 75 mm. Further, in the illustrated embodiment, the first segment 40 of the neck 24 has a length of approximately 10 mm and the second segment 42 has a length of approximately 15 mm. As a result, the hinge pin 64 of the illustrated embodiment is offset from the center of the ratchet drive 28 in a direction perpendicular to the length of the ratchet drive 28 by about 48 mm and is offset from the rear surface of the ratchet head 12 by about 10 mm. These dimensions are merely exemplary and the lengths of the ratchet head 12 and the handle 14 may vary from application to application. For example, referring again to ratchet 10 for a ¼″ or ⅜″ square drive, the ratchet head 12 may have a length between about 60 mm and about 90 mm, and the handle 14 may have a length between about 70 mm and about 100 mm. Further, the size of the ratchet head 12 and the handle 14 may be increased (e.g., scaled up) with ratchets having a larger drive size, such as ½″ and ¾″ square drives.
In the illustrated embodiment, the length of the handle 14 is selected such that the ratchet drive 28 is offset from the center of the ratchet 10 (e.g., offset from the center of the length of the handle) when the handle 14 is in the folded position. For example, the ratchet drive 28 may be offset from the center by approximately 15 mm (or in a range of about 12 mm to about 18 mm). Offsetting the ratchet drive 28 provides a longer lever arm and thereby facilitates the application of greater force even when the handle 14 is folded and the ratchet 10 is being used as a palm ratchet.
Although not shown, the ratchet may, in some alternative embodiments, include a locking hinge that allows the user to lock the angle of the handle with respect to the ratchet head. A variety of flex ratchets with locking hinges are commercially available and therefore the locking hinge will not be described in detail. Suffice it to say that, in one example, the neck may include a plurality of parallel grooves and the handle may include a locking tooth that can be selectively engaged or disengaged with the grooves. More specifically, the locking tooth may be engaged with one of the grooves to lock the handle at the desired angle or disengaged from the grooves to allow free movement of the handle relative to the ratchet head. In applications that include a locking hinge, the stop and/or offset may be adjusted to accommodate the locking structure, such as the locking tooth.
The above description is that of current embodiments of the invention. Various alterations and changes can be made without departing from the spirit and broader aspects of the invention as defined in the appended claims, which are to be interpreted in accordance with the principles of patent law including the doctrine of equivalents. This disclosure is presented for illustrative purposes and should not be interpreted as an exhaustive description of all embodiments of the invention or to limit the scope of the claims to the specific elements illustrated or described in connection with these embodiments. For example, and without limitation, any individual element(s) of the described invention may be replaced by alternative elements that provide substantially similar functionality or otherwise provide adequate operation. This includes, for example, presently known alternative elements, such as those that might be currently known to one skilled in the art, and alternative elements that may be developed in the future, such as those that one skilled in the art might, upon development, recognize as an alternative. Further, the disclosed embodiments include a plurality of features that are described in concert and that might cooperatively provide a collection of benefits. The present invention is not limited to only those embodiments that include all of these features or that provide all of the stated benefits, except to the extent otherwise expressly set forth in the issued claims. Any reference to claim elements in the singular, for example, using the articles “a,” “an,” “the” or “said,” is not to be construed as limiting the element to the singular.
| Number | Date | Country | |
|---|---|---|---|
| Parent | 16292967 | Mar 2019 | US |
| Child | 16808798 | US |
