Expanded – threaded – driven – headed – tool-deformed – or locked-thr – Externally threaded fastener element – e.g. – bolt – screw – etc. – Head driving structure
Reexamination Certificate
2000-06-12
2001-09-25
Wilson, Neill (Department: 3627)
Expanded, threaded, driven, headed, tool-deformed, or locked-thr
Externally threaded fastener element, e.g., bolt, screw, etc.
Head driving structure
C411S404000, C411S919000
Reexamination Certificate
active
06293745
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a screw with an improved head structure, and more particularly to a screw head having a driving socket capable of receiving, a square socket (Robertson) type driver a cross-recess (Phillips) type screw driver, and a flat blade driver. The present invention also relates to a punch for forming such a driving socket in a screw head.
2. Description of the Related Art
U.S. Pat. No. 5,358,368 to Conlan et al. issued on Oct. 25, 1994 discloses a screw having a driving socket capable of receiving a square socket (Robertson) type driver, a cross-recess (Phillips) type screw driver, and a flat blade driver. In this patent, as illustrated in
FIGS. 8 and 9
of the drawings, the driving socket of the head
41
of the screw
40
includes a square recess
42
defined by four vertical walls
43
for receiving a square type driver, aligned slots
45
extending radially outwardly in alignment with two diagonally located corners of the square recess
42
for receiving a flat blade driver, and four grooves
44
extending diagonally outwardly from the corners of the square recess
42
to define a cross-shaped recess to receive a cross-recess type screw driver. The square recess
42
is deeper than the grooves
44
which, in turn, is deeper than the slots
45
. Nevertheless, it is found that the driving socket tends to be damaged at the corner areas
46
when driven by a Phillips type screw driver.
U.S. Pat. No. 5,674,037 to Lu issued on Oct. 7, 1997 discloses a screw having an improved head structure. In this patent, as illustrated in
FIGS. 6 and 7
of the drawings, the head
31
of the screw
30
includes a substantially cubic recess
32
defined by four sides
33
, each of the four sides
33
having a short slot
34
extending perpendicularly outwardly therefrom, and a long slot
35
extending perpendicularly to two opposite sides of the cubic recess
32
. The head structure disclosed by Lu is intended to solve the problem of the screw disclosed by Conlan et al. Nevertheless, it is found that the user may place a Robertson type driver in a wrong position indicated by the dashed-dotted square
50
. As a result, the driving socket tends to be damaged at the corner areas
36
when driven by a power-driven square type socket driver. Namely, the problem encountered by the screw disclosed by Conlan et al. cannot be avoided completely.
SUMMARY OF THE INVENTION
It is the primary object of the present invention to provide a screw having a driving socket capable of receiving a square socket (Robertson) type driver, a cross-recess (Phillips) type screw driver, and a flat blade driver, wherein the driving socket may reliably avoid wrong insertion of a Phillips type driver, thereby preventing damage to the screw head.
It is another object of the present invention to provide a punch for forming such a driving socket in the screw head.
A screw in accordance with the present invention includes a shank and a head. The head includes a driving socket having a long slot that extends axially into the head to a depth. A first short recess is defined in a bottom wall defining the long slot and extended along a longitudinal axis of the long slot, the first short recess being narrower yet deeper that the long slot. A second short recess extends along an axis that is normal to the longitudinal axis of the long slot. The second short recess is as deep as the first short recess, the short recesses together defining a cross-shape recess for receiving a Phillips type screw driver, the cross-shape recess including four ends. The driving socket of the head further includes a square recess that is located within an area defined by the four ends of the short recesses, the square recess being adapted to receive a square socket type driver. The square recess extends axially into the head to a depth deeper than the short recesses. The square recess is defined by four sides and includes four apexes and two diagonal axes that intersect at an intersection. The intersection of the diagonal axes of the square recess is coincident with an intersection of the longitudinal axis and the axis that is normal to the longitudinal axis. One of the diagonal axes of the square recess is at an angle with the axis that is normal to the longitudinal axis, the angle being not equal to 45°.
Other objects, advantages, and novel features of the invention will become more apparent from the following detailed description when taken in conjunction with the accompanying drawings.
REFERENCES:
patent: 1910182 (1933-05-01), Robertson
patent: 2400684 (1946-05-01), Clark
patent: 5020954 (1991-06-01), Dreger
patent: 5358368 (1994-10-01), Conlan et al.
Kamrath Alan
Rider Bennett Egan & Arundel LLP
Wilson Neill
LandOfFree
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