U.S. patent number 3,874,534 [Application Number 05/396,846] was granted by the patent office on 1975-04-01 for fail-safe locking arrangement for refuse collection vehicle.
This patent grant is currently assigned to Lodal, Inc.. Invention is credited to John R. Brisson.
United States Patent |
3,874,534 |
Brisson |
April 1, 1975 |
Fail-safe locking arrangement for refuse collection vehicle
Abstract
A refuse collection vehicle includes a body with a top opening
through which refuse and the like is dumped by means of a pivoting
boom having a refuse container thereon. The container is removably
attached to the boom assembly by interengaging male and female
members which are lockable together. A pair of opposed locking pins
are associated with the male member on the boom assembly and are
adapted to enter pin-receiving openings associated with the female
member on the refuse container. The locking pins are continuously
biased outwardly as by springs to secure the boom assembly and
container together. When the boom is in or adjacent its lowered
position, as when interengaging the male and female locking
members, a compressed air system overcomes the spring biasing force
to keep the locking pins retracted. A compressed air exhaust valve
is responsive to upward boom movement to once again bring the
biasing force into play to provide locking. The refuse container
cannot become unlocked and fall at any position of the boom, even
if the compressed air control system should fail.
Inventors: |
Brisson; John R. (Kingsford,
MI) |
Assignee: |
Lodal, Inc. (Kingsford,
MI)
|
Family
ID: |
23568864 |
Appl.
No.: |
05/396,846 |
Filed: |
September 13, 1973 |
Current U.S.
Class: |
414/406 |
Current CPC
Class: |
B65F
3/04 (20130101); B65F 2003/0246 (20130101); B65F
2003/0279 (20130101) |
Current International
Class: |
B65F
3/02 (20060101); B65f 003/02 () |
Field of
Search: |
;214/302,314,312,313,315,303,307,145 |
References Cited
[Referenced By]
U.S. Patent Documents
Primary Examiner: Makay; Albert J.
Assistant Examiner: Oresky; Lawrence J.
Attorney, Agent or Firm: Andrus, Sceales, Starke &
Sawall
Claims
1. In a refuse collection vehicle for use with a refuse container
having a female interengaging member, the combination
comprising:
a. a body on said vehicle and having an opening for receiving
refuse,
b. a boom assembly pivotally mounted on said vehicle for carrying a
said refuse container between a lowered position and a raised
dumping position,
c. a male interengaging member mounted on said boom assembly and
adapted to supportingly engage the said female member,
d. locking means associated with said male member for selective
locking engagement with said female member,
e. means normally biasing said locking means toward locking
position,
f. and means responsive to the angular position of said boom
assembly for overcoming said biasing means for disengaging said
locking means from said female member.
2. In a refuse collection vehicle for use with a refuse container
having a female interengaging member, the combination
comprising:
a. a body on said vehicle and with said body having an opening for
receiving refuse,
b. a boom assembly pivotally mounted on said vehicle for carrying a
said refuse container between a lowered position and a raised
dumping position,
c. a male interengaging member mounted on said boom assembly and
adapted to supportingly engage the said female member,
d. locking means associated with said male member for selective
locking engagement with said female member, said locking means
comprising a pair of opposed extendable-retractable pins,
e. a pair of generally vertical linkage arms pivotally mounted
between their ends to said boom assembly, and with the lower end
portions of said arms pivotally mounted to said pins,
f. means normally biasing said locking means toward locking
position and with said biasing means comprising springs extending
between said boom assembly and said linkage arms between said
first-named and second-named pivotal mountings,
g. and means for overcoming said biasing means for disengaging said
locking means from the said female member.
3. The combination of claim 2 in which said means for overcoming
said biasing means comprises:
a. extensible means connecting the upper end portions of said
linkage arms to cause pivoting of the linkage arms about the
first-named pivotal mounting,
b. and means to actuate said extensible means.
4. The combination of claim 3 which includes means responsive to
the angular position of said boom assembly for operating said
actuating means.
5. The combination of claim 3 in which:
a. said extensible means comprises a rod connected to an air
chamber,
b. and said actuating means comprises:
1. a source of pressurized air,
2. and a valve connected between said source and said air chamber
for pressurizing said chamber to extend said rod or alternately to
exhaust said chamber to retract said rod.
6. The combination of claim 5 in which said air chamber is secured
to the upper end portion of one of said linkage arms.
7. The combination of claim 5 which includes cam means responsive
to the angular position of said boom assembly for operating said
valve.
8. The combination of claim 1 in which said means for overcoming
said biasing means is cam operated.
Description
BACKGROUND AND SUMMARY OF THE INVENTION
This invention relates to refuse collection vehicles and more
particularly to a fail-safe locking arrangement therefor.
In U.S. Pat. No. 3,016,157 there is disclosed a loader apparatus
including a vehicle having a body with a top opening through which
refuse and the like is dumped by means of a pivoting boom having a
refuse container thereon. The container is removably attached to
the boom assembly by interengaging male and female members which
are locked together by a position responsive mechanical linkage
arrangement.
The present invention is directed to an improvement over the
previous locking structure whereby a compressed air responsive
arrangement permits biased locking of the members upon raising of
the boom. A fail-safe system assures that the lock will hold, even
if the compressed air system fails.
More particularly, a pair of opposed locking pins are associated
with the male member on the boom assembly and are adapted to enter
pin-receiving openings associated with the female member on the
refuse container. The locking pins are continuously biased
outwardly, as by springs to secure the boom assembly and container
together. When the boom is in or adjacent its lowered position, as
when interengaging the male and female locking members, a
compressed air system overcomes the spring biasing force to keep
the locking pins retracted. A compressed air exhaust valve is
responsive to upward boom movement to once again bring the biasing
force into play to provide locking. The refuse container cannot
become unlocked and fall at any position of the boom, even if the
compressed air control system should fail.
BRIEF DESCRIPTION OF THE DRAWINGS
The accompanying drawings illustrate the best mode presently
contemplated by the inventor for carrying out the invention.
In the drawings:
FIG. 1 is a side elevation of a refuse collection vehicle
incorporating the concepts of the invention;
FIG. 2 is an enlarged fragmentary perspective view showing the male
and female interengaging members prior to engagement;
FIG. 3 is an enlarged fragmentary rear elevation of the male
interengaging member and associated parts with the locking pins in
retracted position;
FIG. 4 is a view similar to FIG. 3, with the locking pins extended;
and
FIG. 5 is a schematic view of the boom position responsive locking
control system.
DESCRIPTION OF THE PREFERRED EMBODIMENT
As shown in FIG. 1 of the drawings, the invention is contemplated
for use in a refuse collection vehicle 1 having a cab 2, a chassis
frame 3, and a body 4 for receiving and storing refuse for
subsequent discharge. Body 4 is provided with an opening 5 in its
top, with the opening having a suitable closure 6.
A boom assembly 7 of generally inverted U-shape is pivoted at its
rearward end to body 4, as by a transverse boom mounting shaft 8.
As shown in FIG. 1, assembly 7 is pivotable upwardly from a forward
lowered position to a rearward dumping position, as by a suitably
actuated boom cylinder 9.
The forward portion of boom assembly 7 is adapted to removably
receive a refuse container 10 for dumping into body 4. For this
purpose, a male interengaging member 11 is pivotally mounted on the
front end portion of assembly 7, while a female interengaging
member 12 is fixedly secured to a wall of container 10. See FIG.
2.
Male member 11 includes a generally triangular upper portion 13 and
a lower base portion 14, the latter including end walls or supports
15. Female member 12 includes an upper portion having a pair of
downwardly extending divergent legs 16, which form an inverted
triangle for supporting receipt of male portion 13. Each leg 16
merges downwardly into a generally straight arm 17 having an
opening 18 therein, for purposes to be described.
In accordance with the invention, members 11 and 12 are adapted to
be engaged and releasably locked together. For this purpose, and as
best shown in FIGS. 3 and 4, a pair of spaced linkage arms 19 are
disposed behind triangle 13 and are pivotally mounted between their
ends to a support 20 on boom assembly 7, as at pivot points 21.
Arms 19 are disposed generally vertically when assembly 7 is in its
lowered position, and the lower arm end portions are pivotally
secured, as at 22, to a pair of opposed horizontal locking pins 23
which slideably extend through male base end walls 15.
Pins 23 are continually biased toward their extended position. For
this purpose, a spring 24 is connected between boom assembly
support 20 and a bracket 25 on the respective linkage arm below
each pivot point 21. When male and female members 11 and 12 are
interengaged, they may be locked together by spreading extension of
pins 23 into female member openings 18.
The invention contemplates control means for selective retraction
of locking pins 23, as during engagement or disengagement of refuse
container 10 from boom assembly 7, with the control means being
responsive to the boom assembly angular position to retract or
permit extension of the pins.
For this purpose, vehicle 1 includes a source of pressurized air,
such as a tank 26 which is connected through a valve 27 to an air
control unit 28 mounted to the upper end portion of one of the
linkage arms 19. Control unit 28 may be of any suitable type, and
is shown as being of the diaphram actuated air chamber type wherein
when pressure is applied from tank 26, a rod 29 on the unit will be
caused to extend. The outer end of rod 29 is pivotally secured to
the upper end portion of the other linkage arm 19. Thus, when unit
28 is pressurized, as in FIG. 3, and rod 29 extends, arms 19 will
pivot against the force of springs 24 to retract pins 23. When the
pressure is off, rod 29 will retract so that springs 24 will cause
extension of locking pins 23, as in FIG. 4.
Air control unit 28 and the resultant locking pin operation is
responsive to positioning of the boom assembly. For this purpose, a
cam 30 is adjustably mounted on boom mounting shaft 8 and is
positioned to engage and actuate valve 27. See FIG. 5. When
assembly 7 is in its generally lowered position, cam 30 is in
engagement with valve 27, so that air will actuate control unit 28
to retract pins 23. As the boom assembly is raised, cam 30 will
disengage from valve 27 so that air in the chamber of unit 28 will
be exhausted back through the valve and a line 31 to cause springs
24 to extend the pins into locking position.
Because pins 23 remain extended if there is no air pressure at unit
28, a fail-safe system is provided wherein failure of the air
system will not cause unlocking with the possible disengagement of
refuse container 10 from boom assembly 7 when they are in a raised
position.
While the control system has been described relative to the use of
air, other gases or fluids may be used without departing from the
spirit or scope of the invention.
Various modes of carrying out the invention are contemplated as
being within the scope of the following claims particularly
pointing out and distinctly claiming the subject matter which is
regarded as the invention.
I claim:
* * * * *