U.S. patent number 3,782,432 [Application Number 05/230,777] was granted by the patent office on 1974-01-01 for screw holding driver.
This patent grant is currently assigned to H.J.J. Co., Inc.. Invention is credited to Philip H. Allen.
United States Patent |
3,782,432 |
Allen |
January 1, 1974 |
SCREW HOLDING DRIVER
Abstract
An insulated screw holding driver has a tubular plastic handle
which encases the working elements of the screw holder including
twin expanding bits and their control housing, rod and cam pin
pre-assembled as an insert into the handle which holds this
assembly and its components in place. The handle has an outer
polygonal contour and an inner circular contour.
Inventors: |
Allen; Philip H. (Los Gatos,
CA) |
Assignee: |
H.J.J. Co., Inc. (Los Gatos,
CA)
|
Family
ID: |
22866542 |
Appl.
No.: |
05/230,777 |
Filed: |
March 1, 1972 |
Current U.S.
Class: |
81/444 |
Current CPC
Class: |
B25G
1/00 (20130101) |
Current International
Class: |
B25G
1/00 (20060101); B25b 015/02 () |
Field of
Search: |
;145/5R,5D,5E |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Jones, Jr.; James L.
Assistant Examiner: Bicks; Mark S.
Attorney, Agent or Firm: Harper Allen et al.
Claims
I claim:
1. In a screw holding driver the combination comprising a tubular
plastic handle, a tubular member, a bit assembly having a pair of
opposing bits and a rod engaged with said bits, a camming pin
positioned in the forward part of said tubular member, said tubular
member having said bit assembly positioned therein with said
opposing bits having gradually sloping cam surfaces engaging
opposite sides of said camming pin, said tubular member having
means to hold the bits in locking engagement with said rod, said
tubular member extending over a substantial part of said bits to
hold said bits and said rod assembled with said bit assembly, the
inside of one end portion of said plastic handle having a reamed
recess for receiving said tubular member with said bit assembly
therein, said tubular member being press fitted into said plastic
handle.
Description
DESCRIPTION OF THE INVENTION
The present invention relates to screw holding drivers of the type
disclosed in U.S. Pat. No. 3,150,699 dated Sept. 29, 1964 and is
concerned more particularly with such a driver having an insulated
handle construction and also having a particularly advantageous
method of assembly and for holding of the various elements in
place.
It is a general object of the invention to provide an improved
screw holding driver.
A further object of the invention is to provide a screw holding
driver wherein the tubular plastic handle encases the operating
parts of the blade or bit holding tube, and the blades or bits and
their expanding pin are carried by the tube and held in place by
the handle.
Other objects and advantages of the invention will be apparent from
the following description of a preferred embodiment thereof, taken
in connection with the accompanying drawings, in which:
FIG. 1 is a side elevational view of the screw holding driver;
FIG. 2 is a composite schematic perspective view illustrating the
various elements of the screw holding driver and their method of
assembly;
FIG. 3 is a cross sectional view taken in the plane indicated by
the line 3--3 in FIG. 1; and
FIG. 4 is a cross sectional view taken in the plane indicated by
the line 4--4 in FIG. 1.
Referring to the drawings, the screw holding driver of the instant
invention comprises a tubular extruded plastic handle 10 which is
formed preferably with an outer hexagonal shape and an inner round
or cylindrical shape. At its front end the hollow handle 10 has a
reamed recess 11 terminating in a radially disposed shoulder 11a.
Received within the reamed recess 11 and abutting the shoulder 11a
is a metallic tube 12 which may have its outer surface knurled at
13 substantially throughout its length and which carries and
surrounds the two opposite bits or points 14. These bits or points
are of the constructions shown in the above identified patent to
which reference is made for more particular description. These bits
14 are received on opposite sides of a rod 16 of the character
shown and described in the above patent. To spread the bits 14
apart as they recede into the hollow handle 10, there is a
transverse cam pin 17 received in respective apertures 18 in the
opposite sidewalls of the tube insert 12 and dispersed between the
respective conventional cam surfaces of the bits. It is noted that
certain components of the tool including the bits 14, the rod 16,
the tube 12 and the pin 17 are pre-assembled by placing the two
bits 14 onto the rod 16 with their retaining ears 14a received into
the groove 16a of the rod, and then inserting the pin 17 through
the two apertures 18. The two bits 14 and the rod 16 are moved with
respect to tube 12 until they contact and engage the pin 17 which
is freely held in the apertures 18 to prevent its loss. With the
parts thus pre-assembled, this pre-assembled unit is pressed into
the handle 10 until the tube 12 engages the shoulder 11a, and the
knurl 13 seats inside of the reamed recess 11 with a light press
fit. If the knurl is omitted, then a suitable glue or adhesive may
be employed to hold the tube insert 12 within th handle 10. Epoxy
may be employed. As seen in FIG. 3, for example, the ends of the
pin 17 are adjacent and may contact the wall of the hollow handle
10 within the reamed recess 11 and the pin 17 is retained in
position by the handle 10.
As explained in the above identified patent, in operation a screw
to be held is placed with the slot embracing the points 14 and when
the bit structure is caused to recede within the handle 10 the pin
17 forces the bits 14 apart to engage and hold the walls of the
screw slot.
While I have shown and described a preferred form of the invention,
it is obvious that the invention is capable of variation and
modification from the forms shown so that the scope should be
limited only by the scope of the claims appended hereto.
* * * * *