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Патент USA US2406149

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Aug. 20, I946.
'
'
J. a. JENNI
2,406,149
SCREW DRIVER
Filed Feb. 17, 1944
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Jésse 5 Jé/I/U' '
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Patented Aug. 20, 1946v
2,406,149
UNITED STATES PATENT OFFICE
2,406,149
SCREW DRIVER
Jesse B. Jenni, Festus, Mo.
Application February 17, 1944, Serial No. 522,805
1
2 Claims. (Cl. 145-66)
2
This invention relates to new and useful im
provements in tools and more particularly to a
rack and gear operated tool for working in close
quarters.
The principal‘ object of the present invention
is to provide a tool which can be operated by re
ciprocatory movement of a rack against a gear,
wherein the rack is rotatable so as to be engage
able and disengageable with the gear, thus dis
bar ea so that its teeth It! disengage from the
teeth l5 of the gear II and the rack bar 9a can
be pushed through the laterally disposed portion
a of the housing without disturbing the gear II
C21
and when the rack bar has been thus returned ,
to its starting position, it can be given a slight
turn to mesh its teeth l0 with the teeth l5 of the
gear it so that the tool I 3 will be rotated and
the rack bar is again pulled.
pensing with more complicated and expensive 10
While the foregoing speci?cation sets forth the
rack disengaging means.
invention in speci?c terms, it is to be understood
Other objects and advantages of the invention
that numerous changes in the shape, size and
will become apparent to the reader of the follow
materials may be resorted to without departing
ing description.
from the spirit and scope of the invention as
In the drawing:
15 claimed hereinafter.
Figure 1 is a perspective view.
Having described the invention, what is
Figure 2 is a top plan view with the cover re
claimed as new is:
moved.
'
1. A tool of the character described comprising
Figure 3 is a section on the line 3-3 of Fig
a housing, a gear in the housing, said housing
ure 1.
'
20 having a guide portion having an opening there
Referring to the drawing wherein like numerals
in adjacent the periphery of said gear, through
designate like parts, it can be seen that numeral
which the teeth of the gear extend, a rack bar
5 denotes a gear housing consisting of a lower
disposed through the guide portion and engaged ,
hollow body 6 and a cover plate ‘I, secured to the
by said gear, a tool projecting from the gear,
body 6 by screws or the like 8. The body 6 and 25 said rack bar being rotatable to engage or dis
also the cover 1 has a laterally disposed portion a
engage its teeth with the teeth of the gear, said
having a passageway 9 therethrough and through
guide portion and said rack bar being of non-cir
this passageway is disposed an elongated bar 9a
cular cross section to limit rotation of the rack
having a rounded portion b and a substantially
bar when disengaging from the gear.
‘
tapered portion 0 and in the latter are rack teeth 30
2. A tool comprising a housing, a gear en
ID. The passageway 9 ?ares inwardly as at d.
closed in the housing, a rotatable tool bit detach
The housing 5 has a rounded portion in which
ably journaled in said housing and detachably
is located a gear ll having a square opening at
connected to said gear, said tool bit constituting
its center for receiving the squared end 12 of a the sole journaling means for said gear during
screw driver or the like I3 which extends into the
use of the device, a guide portion in said hous
housing 5 through an opening 14 in the bottom
ing adjacent the periphery of said gear, a rack
of the housing section 6.
The teeth l5 of the gear II are beveled as
bar slidably and removably received in said
guide portion and normally engaging the teeth
shown in Figure 3 and obviously by rotating the
of said gear, said rack bar being rotatable in said
rack bar 9a by a handle 16 it has at one outer 40 guide portion to engage or disengage its teeth
end, the teeth ll! of the rack bar can be disen
from the teeth of the gear, said rack being of
gaged from the teeth l5 of the gear II.
oval shape in cross section and said guide por
For instance, assuming that the rack bar 9a
tion having rotation limiting surfaces cooperat
has been pulled toward the mechanic to its full
ing with said rack limiting rotation thereof
est extent and it is desired to replace the rack 45 when disengaging said rack from said gear.
bar to- repeat this pull without disturbing the
tool l3. All that is necessary is to rock the rack
‘JESSE B. JENNI.
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