U.S. patent number 3,864,839 [Application Number 05/369,924] was granted by the patent office on 1975-02-11 for directional guide for power hand drill.
Invention is credited to Lloyd J. Wolf.
United States Patent |
3,864,839 |
Wolf |
February 11, 1975 |
DIRECTIONAL GUIDE FOR POWER HAND DRILL
Abstract
A power hand drill is provided with a device for assisting its
operator in accurately positioning its bit horizontally for
drilling vertical surfaces and vertically for drilling horizontal
surfaces. The positioning-assisting device comprises a circular
bubble type level mounted for selective securement to surfaces of
the drill housing parallel and normal respectively to the drill
axis.
Inventors: |
Wolf; Lloyd J. (Roanoke,
TX) |
Family
ID: |
23457503 |
Appl.
No.: |
05/369,924 |
Filed: |
June 14, 1973 |
Current U.S.
Class: |
33/334; 33/371;
33/384; 33/390 |
Current CPC
Class: |
G01C
9/28 (20130101); B25H 1/0085 (20130101); G01C
9/36 (20130101) |
Current International
Class: |
B25H
1/00 (20060101); G01C 9/28 (20060101); G01C
9/36 (20060101); G01C 9/18 (20060101); G01c
009/28 (); G01c 009/36 () |
Field of
Search: |
;33/334,347,372,370,376,371,373,390,384 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Rothberg; Samuel B.
Assistant Examiner: Stephan; Steven L.
Attorney, Agent or Firm: Burgess; F. Travers
Claims
I claim:
1. The combination including a power hand drill having a housing
with its top wall generally parallel to the drill axis and its near
end wall generally normal to the drill axis, a spirit level of the
circular bubble type, and means for selectively securing said level
to said drill parallel to and normal to the drill axis said
selective securing means comprising a plate mounting said spirit
level to form a low-profile assembly and a pair of slots along each
of the top and rear end walls of said housing parallel to and
normal to the drill axis respectively for alternately slidably
receiving opposite edges of said plate.
2. The combination according to claim 1 wherein said slots are
formed with undercut sides matingly engageable with the side edges
of said plate.
3. The combination according to claim 2 wherein said plate is
formed with an upstanding finger-grip tab on one of its ends.
Description
BACKGROUND OF THE INVENTION
1. Field of the Invention
The invention relates to power drills and consists particularly in
means for selectively facilitating accurate guidance of the drill
in horizontal and vertical directions.
2. The Prior Art
U.S. Pat. No. 2,525,387 to Volk and U.S. Pat. No. 2,877,561 to
Morse both disclose inclinometers mounted on electric drills to aid
the user in aiming them at any desired angularity. Both of the
patented devices utilize relatively complex inclinometer devices,
require accurate visual maintenance of the inclinometer at the
desired angular setting throughout the drilling operation to assure
the desired angularity of the hole.
SUMMARY OF THE INVENTION
The invention provides a simple, inexpensive, compact and easily
operated means for accurately guiding a power drill in horizontal
or vertical directions.
BRIEF DESCRIPTION OF THE DRAWING
FIG. 1 is a side elevational view of an electric hand drill
incorporating the invention.
FIG. 2 is a top view of the drill illustrated in FIG. 1.
FIG. 3 is a rear end elevational view of the drill illustrated in
FIGS. 1 and 2.
FIG. 4 is a perspective view of the drill guidance assisting
device.
DETAILED DESCRIPTION OF THE INVENTION
An electric hand drill has a housing 1 formed with a top surface 3
parallel to the drill axis and a rear end surface 5, above handle
7, normal to the drill axis.
For assistance in guiding drill 1, 7 horizontally, a shallow
elongated slot 9 with its longitudinal sides undercut as at all to
form a dovetail cross section is formed in the rear portion of
drill housing top surface 3, with its rear end open.
A spirit level 13 of the circular bubble type is mounted on a plate
15 having its longitudinal sides 17, 17 spaced and shaped for
sliding engagement with undercut sides 11, 11 of slot 9 so that
level 13 may be removably secured to the drill housing top surface
3 by sliding plate 15 into slot 9. To facilitate insertion and
removabl of plate 15, it is formed on one end with an upwardly
extending tab 19 for engagement by the drill user's fingers.
With level 13 secured to the top of the drill housing as shown in
FIGS. 1 and 2, the user of the drill may guide the drill
horizontally, for drilling into a vertical surface, simply by
keeping bubble 13a centered in the level 13 as he drills.
For drilling vertical holes, as in horizontal surfaces such as
floors, the rear surface 5 of drill housing 1 is formed with a
vertical slot 21, similar to slot 9, with an open upper end and
undercut sides 23, 23 spaced apart to slidably receive the sides of
plate 15 when the latter is inserted from the upper end of the
slot.
With level 13 secured to the rear end of the drill housing as shown
in FIG. 3, the user of the drill may guide the drill vertically for
drilling into a horizontal surface, simply by keeping bubble 13a
centered in level 13 as he drills.
When the level 13 is not in use, it may be removed from the drill
and stored in the user's tool box.
The details of the invention may be varied substantially without
departing from the spirit of the invention and the exclusive use of
such modifications as come within the scope of the appended claims
is contemplated.
* * * * *