U.S. patent number 3,890,696 [Application Number 05/359,104] was granted by the patent office on 1975-06-24 for tow truck boom and method of constructing same.
Invention is credited to Earl R. Buske.
United States Patent |
3,890,696 |
Buske |
June 24, 1975 |
Tow truck boom and method of constructing same
Abstract
A tow truck includes a pair of booms comprised of two identical
channel-shaped members being secured together in face-to-face
relationship to form a space therebetween. Each of the members
includes serrations in the side walls in a common transverse plane
at the center of the boom and the serrations are closed by
weldments. The boom is constructed by taking a blank sheet of
rectangular material and shaping it to taper it from the transverse
center to the outer ends along all of its edges and providing
inwardly shaping V-shaped notches along the transverse centerline.
Side walls are then formed by bending and then the resulting two
channel-shaped members are placed in edge-to-edge engagement along
one end and held in this position by welding while the opposite
ends are drawn together such that bending occurs in a plane through
the vertexes of the V-shaped notches and the notches are closed.
All abutting edges are then welded together to complete the
boom.
Inventors: |
Buske; Earl R. (Pocahontas,
IA) |
Family
ID: |
23412316 |
Appl.
No.: |
05/359,104 |
Filed: |
May 10, 1973 |
Current U.S.
Class: |
228/173.6;
29/897.2; 228/155 |
Current CPC
Class: |
B23K
9/0026 (20130101); B66C 23/64 (20130101); B60P
3/28 (20130101); B21D 47/01 (20130101); Y10T
29/49622 (20150115) |
Current International
Class: |
B23K
9/00 (20060101); B60P 3/28 (20060101); B66C
23/64 (20060101); B21D 47/00 (20060101); B66C
23/00 (20060101); B21D 47/01 (20060101); B23k
031/06 () |
Field of
Search: |
;29/471.1,475,482,484,155C ;156/211 ;113/116A,116W,116HH |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Husar; Francis S.
Assistant Examiner: Hampilos; Gus T.
Attorney, Agent or Firm: Zarley, McKee, Thomte &
Voorhees
Claims
I claim:
1. Method of constructing a boom having a cross sectional area that
increases from the opposite ends towards the center comprising the
steps of,
providing a pair of channel-shaped members in face-to-face
relationship wherein each channel member includes side walls which
increase in height from the outer ends of the members towards the
center and a V-shaped notch is provided at the center of each side
wall, said notch having its vertex at the base of the channel,
bending of the base of each of said members along a fold line
extending across the base of each member and through the vertexes
of said V-shaped notches to bring said members into engagement
along the edges of their adjacent side walls, and
bonding together the adjacent edges of said members.
2. The method of claim 1 wherein said bonding of said adjacent
edges of said members is further defined as being welding.
3. The method of claim 1 wherein the bending of each of said
members is further defined as including first placing the adjacent
edges of adjacent ends of said members in engagement with each
other and then holding said adjacent ends while the opposite ends
are drawn together causing said members to be bent along said fold
line.
4. The method of claim 1 wherein said providing of said pair of
channel members is further defined as including the steps of first
providing a pair of rectangular blank sheets, tapering the blank
sheets along opposite side edges in opposite directions from the
transverse centerline towards the outer ends, and then bending the
sheets to form said channel-shaped members.
5. The method of claim 4 wherein the steps of forming said V-shaped
notches is performed prior to bending the sheets to form said
channel members.
Description
A wrecker truck will usually include two boom members. These
members must be rugged and strong as they are the backbone of the
wrecker equipment. At the same time they must be aesthetically
attractive and have eye appeal. They should also be smooth to allow
for ease of cleaning and painting. To overcome the tendency of the
boom members to buckle in the center, they may be beefed up in the
center area by that area being larger in cross section than the
outer ends. To produce a boom-shaped member having a nonuniform
cross section requires special construction procedures.
The boom of this invention is easily fabricated with a minimum
expenditure of time and materials. The boom member is square in
cross section throughout its length but increases in cross section
from the outer ends toward a transverse center plane. Two channel
members are first formed and notches are provided in the side walls
at the transverse center plane such that when the ends of the
channel members are bent towards each other the V-shaped notches
are closed and the side wall edges move into engagement whereupon
they are welded to provide a totally enclosed boom. Thus, although
the boom is nonuniform in cross section throughout its length it
nevertheless is constructed from only two separate members.
This invention consists in the construction, arrangements and
combination of the various parts of the device, whereby the objects
contemplated are attained as hereinafter more fully set forth,
specifically pointed out in the claims, and illustrated in the
accompanying drawings in which:
FIG. 1 is a perspective view of a wrecker truck utilizing the boom
members of this invention.
FIG. 2 is a top plan view of a blank sheet of metal material shaped
for construction of the boom.
FIG. 3 is a side elevational view of the blank sheet of material
after the bending step wherein channel side walls have been
formed.
FIG. 4 is a later side elevational view wherein the two
channel-shaped members are placed in facing relationship with a
pair of adjacent ends being held together while the opposite ends
are separated.
FIG. 5 is a further side elevational view after the opposite ends
of the channel members are drawn together and secured by welding;
and
FIG. 6 is a top plan view taken along line 6--6 in FIG. 5.
FIG. 7 is a cross sectional view taken along line 7--7 in FIG.
6.
The boom members of this invention are referred to generally in
FIG. 1 by the reference numeral 10 and are shown on a truck 12
having wrecker equipment 14 thereon.
It is seen that the boom members 10 are not uniform in cross
section along their length having their biggest cross section at
the center and the cross section decreases towards the opposite
ends thereof. The boom is hollow throughout its entire length and
comprises only two separate elements, two channel-shaped members 16
and 18 as seen in FIG. 4.
Each of the channel-shaped members are identical and are formed
following the same method steps. First a blank sheet of rectangular
in shape material is shaped to provide the configuration in FIG. 2
wherein the side edges 20 all taper from a transverse center fold
line 22 towards the outer ends 24. Inwardly extending V-shaped
notches 26 are provided on the transverse centerline 22 such that
when the channel side walls 28 of FIG. 3 are formed by bending the
V-shaped notches extend from the outer side wall edges to the base
portion 30 of the channel-shaped member. Next, the two
channel-shaped members are placed in facing relationship as seen in
FIG. 4 with one pair of ends engaging each other along the side
wall edges and weldments 32 are utilized for securing the adjacent
ends 32 together. Next, the opposite ends 34 are drawn together
resulting in the V-shaped notches being closed as seen in FIG. 5
and the outer edges of the side walls 28 moving into engagement
with each other identical to the ends 32 and weldments 31 are also
employed to hold the ends 34 together. The result of these steps is
a completed boom 10 as seen in FIG. 6 formed from only two pieces
of material and being square in cross section and hollow throughout
its length while having a cross section which increases from the
outer ends toward the transverse center which is in a plane through
the vertexes of the V-shaped notches 26 and on the foldlines 22.
This provides the maximum strength in the center where it is needed
and also provides a boom member having aesthetically appealing
lines. All abutting edges are secured together by weldments.
* * * * *