Tools – Wrench – screwdriver – or driver therefor – Sliding jaw face
Reexamination Certificate
2000-07-12
2001-10-02
Smith, James (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Sliding jaw face
Reexamination Certificate
active
06295899
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a wrench, and more particularly to a wrench having an adjustable mechanism for engaging with and for driving the fasteners of different sizes.
2. Description of the Prior Art
U.S. Pat. No. 4,440,047 to Robbins discloses a typical wrench having a number of longitudinal or inclined grooves formed in the driving head thereof for slidably receiving a number of drive inserts respectively. A number of springs are required to be engaged into the grooves and engaged with the drive inserts for biasing the drive inserts to engage with the fasteners to be driven. The drive inserts each is required to be engaged with and biased by a spring member such that a complicated structure is thus formed and may not be easily assembled.
The present invention has arisen to mitigate and/or obviate the afore-described disadvantages of the conventional wrenches.
SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a wrench including a simplified adjustable mechanism for engaging with and for driving the fasteners of different sizes.
In accordance with one aspect of the invention, there is provided a wrench comprising a drive head including an opening for defining an inner peripheral portion and for forming a center, the head including a plurality of notches formed in the inner peripheral portion and each defined by an inclined surface, the inclined surfaces each including a first end located closer to the center of the opening of the head and a second end located distal to the center of the opening of the head, a barrel rotatably received in the opening of the head and having a bore for receiving a fastener to be driven by the drive head and having a plurality of channels communicating with the bore of the barrel, and a plurality of drive inserts slidably received in the channels of the barrel and each having a first end extendible inward of the bore of the barrel for engaging with the fastener, and each having a second end slidably engaged with the inclined surfaces of the head for determining an engagement of the first ends of the drive inserts into the bore of the barrel.
The barrel includes a first end and a second end. A securing device includes a peripheral stop extended radially outward from the first end of the barrel, and includes a ring secured to the second end of the barrel, for engaging with the head and for retaining the barrel within the opening of the head. The ring includes a hand grip extended outward therefrom for rotating the ring and the barrel relative to the head.
A spring biasing device or a magnetic forcing device may further be provided for biasing or forcing the drive inserts to engage with the first ends or the second ends of the inclined surfaces of the head.
The spring biasing device includes a spring engaged between the head and the ring for biasing the ring and the barrel to force the drive inserts to engage with the first ends of the inclined surfaces of the head. The head includes a groove formed therein for receiving the spring, the ring includes an ear extended therefrom and engaged into the groove of the head and engaged with the spring.
Further objectives and advantages of the present invention will become apparent from a careful reading of a detailed description provided hereinbelow, with appropriate reference to accompanying drawings.
REFERENCES:
patent: 810304 (1906-01-01), Remion
patent: 3906822 (1975-09-01), Hertelendy et al.
patent: 4440047 (1984-04-01), Robbins
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