U.S. patent number 3,866,299 [Application Number 05/386,286] was granted by the patent office on 1975-02-18 for seal assembly tool.
This patent grant is currently assigned to G & D Tool Company, Inc.. Invention is credited to Jack C. Gregg, Max D. White.
United States Patent |
3,866,299 |
Gregg , et al. |
February 18, 1975 |
SEAL ASSEMBLY TOOL
Abstract
A tool for facilitating the assembly of a dust boot or seal with
the cylinder and piston of a caliper disc brake actuator,
comprising a pair of allochirally arranged bars pivoted together to
define relatively long handle sections and relatively short distal
sections, the distal sections carrying mating plates shaped as
part-circular arcs, the plates being arranged to define an oval
when their distal tips are in contact and to lie in a common circle
when their tips are separated, the plates being formed with
external grooves lying in a plane perpendicular to the axis of such
common circle and adapted to receive an internal bead at the
proximal end of such a boot for radially expanding and
longitudinally extending the boot, and resilient means resisting
separation of the plates.
Inventors: |
Gregg; Jack C. (Elwood, IN),
White; Max D. (Noblesville, IN) |
Assignee: |
G & D Tool Company, Inc.
(Elwood, IN)
|
Family
ID: |
23524962 |
Appl.
No.: |
05/386,286 |
Filed: |
August 3, 1973 |
Current U.S.
Class: |
29/235;
29/450 |
Current CPC
Class: |
F16D
65/0043 (20130101); B25B 27/0035 (20130101); B25B
27/0028 (20130101); Y10T 29/53657 (20150115); Y10T
29/4987 (20150115) |
Current International
Class: |
B25B
27/00 (20060101); B23p 019/02 () |
Field of
Search: |
;29/235,235.5 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
|
|
|
|
|
|
|
237,824 |
|
Jan 1962 |
|
AU |
|
686,434 |
|
Jan 1953 |
|
GB |
|
Primary Examiner: Jones, Jr.; James L.
Attorney, Agent or Firm: Coffey; William R.
Claims
1. For use with a power disc brake cylinder having an open end with
an inwardly-opening peripheral groove near said open end and spaced
axially outwardly from said cylinder open end and partially
obstructing access to said open end, an outboard shoe support
bracket formed integrally with said cylinder, a piston for
reciprocation in said cylinder and insertable through said open
end, said piston being formed with an outwardly-opening peripheral
groove near its proximal end, and a sealing gasket including an
external peripheral bead at one end receivable in said first-named
groove, and an internal peripheral bead at its other end receivable
in said piston groove; the invention which consists of a pair of
allochirally related bars, each having a handle portion and a
distal portion, means pivotally connecting said bars together so
that movement of said handle portions toward each other separates
said distal portions, and each of said distal portions being
part-circular and having a peripheral extent slightly less than
180.degree. and being formed to provide an outwardly opening,
peripherally coextensive groove for receiving said internal bead,
means resiliently biasing said handle portions away from each
other, and the inner surfaces of said distal portions, when
separated to a predetermined degree, lying in a common circle
having a diameter slightly exceeding the outer diameter of said
piston whereby said piston may be axially entered through the
orifice defined by said distal portions.
Description
The present invention relates to an applicator tool for
facilitating the installation of a seal or boot between the open
end of a cylinder and the outer end of a piston reciprocable in the
cylinder; and the primary object of the invention is to provide a
novel tool specifically designed to perform that function. Further
objects of the invention will appear as the description
proceeds.
To the accomplishment of the above and related objects, our
invention may be embodied in the form illustrated in the
accompanying drawings, attention being called to the fact, however,
that the drawings are illustrative only, and that change may be
made in the specific construction illustrated and described, so
long as the scope of the appended claims is not violated.
In the drawings:
FIG. 1 is an exploded, somewhat diagrammatic longitudinal section
of a caliper housing for a known power disc brake assembly, a
piston for cooperation therewith and a known form of boot;
FIG. 2 is an enlarged, fragmentary section through such a boot;
FIG. 3 is a section similar to FIG. 1, showing the piston partially
entered in the cylinder and showing our tool in use in an
intermediate stage of manipulation to make the operative connection
between the boot and the piston;
FIG. 4 is a similar section, showing the parts fully assembled;
FIG. 5 is an elevation of our improved tool; and
FIG. 6 is a section taken on the line 6--6 of FIG. 5.
Referring more particularly to the drawings, it will be seen that
we have illustrated a conventional caliper housing 10 formed to
provide a cylinder 11. Near the open end of the cylinder, there is
provided an inwardly-opening peripheral groove 12 and between the
groove 12 and the open end of the cylinder is provided a further
internally opening groove 13. Conventionally, an O ring or similar
packing 14 is installed in the groove 12. According to conventional
practice, a seal or boot 15, formed of soft, flexible and elastic
rubberoid material, is installed between the cylinder 11 and a
piston 16 adapted to be mounted for reciprocation in the cylinder
11. Said piston is conventionally formed with a peripheral
outwardly opening groove 17 near its trailing end.
The configuration of the boot 15 is illustrated in FIG. 2. As
shown, it has an external bead 18 at one end for snug reception in
the groove 13, whereby that end of the boot is anchored with
respect to the casing 10. An outturned section 19 merges with a
substantially cylindrical body portion 20 which, in turn, merges
with an inwardly and axially rolled section 21 which terminates in
an internal peripheral bead 22 proportioned and designed for
reception in the groove 17 of the piston 16. It will be apparent
that, since the bead 22 must have a significantly smaller diameter
than does the bead 18, difficulty will be encountered in entering
the piston 16 past the bead 22 without rolling the portion 20, 21,
22 axially inwardly. It is to overcome that difficulty that we have
devised the tool of the present disclosure.
The tool is best illustrated in FIGS. 5 and 6 wherein it is
generally designated by the reference numeral 23. The tool
comprises allochirally arranged bars 24 and 25 each having a handle
portion 26 or 27 and a shorter, distal portion 28 and 29. The bar
24 is provided with arms 30, 31 while the bar 27 is provided with
arms 32, 33 so spaced as to be received between the arms 30 and 31
when the two bars are brought into facing relation. The arms are
perforated for the reception of a pivot 34, and a coiled spring 35
is wrapped about the pivot 34 and comprises arms 36 and 37
extending, respectively, into contact with the handle portions 26
and 27 to bias the handle portions away from each other and the
distal portions 28 and 29 toward each other.
Suitably secured, as by welding, for instance, to the distal
regions of the tool are mating, arcuate plates 38 and 39. Each of
these plates is part circular but somewhat less than semi-circular
so that, when their distal regions are in contact under the
influence of the spring arms 36 and 37, the mating plates define an
oval figure. However, when the handle portions 26 and 27 are
pressed toward each other against the tendency of the spring 35,
the plates 38 and 39 will be separated so that they may lie in a
common circle slightly larger than the outside periphery of the
piston 16.
As is most clearly shown in FIGS. 3 and 6, the axial dimension of
the plates 38 and 39 tapers from their ends nearer the sections 28
and 29.
At or near its end remote from the taper, each plate 38 or 39 is
formed with a peripheral, outwardly opening groove 40, the
cross-section of which closely approximates the cross-section of
the groove 17 of the piston 16.
In use, the ring or seal 14 is installed by hand. Then, the bead 18
is manually tucked into the groove 13. Now, with the plates 38 and
39 in their solid line position of FIG. 5, the rolled portion 21,
22 of the boot 15 is rolled outwardly and the bead 22 is slipped
over the forward end of the tool 23 and worked into the groove 40.
Preferably, the interior surface of the boot and the exterior
surface of the tool will be somewhat lubricated with, for instance,
conventional brake fluid.
At this time, the tool orifice will be substantially in register
with the open end of the cylinder 11. Now, the handle portions of
the tool will be squeezed to expand the orifice between the plates
38 and 39, thereby likewise expanding the left-hand end portions of
the boot 15. The piston 16 is then introduced through the tool
orifice and into sealing engagement with the ring 14. The tool is
now moved toward the left completely to straighten the rolled
portion 21 of the boot and, in some cases, to stretch the elastic
boot longitudinally, care being taken not to dislodge the bead 18.
When the right-hand extremity of the plates 38 and 39 has passed
the groove 17 in the piston, (or the piston has been manually moved
to the right to cause the groove 17 to pass the plate extremities)
then the bead 22 will snap or be worked off the end of the tool and
will enter the groove 17 to complete the assembly of the boot
between the cylinder and the piston.
Now, that the tool has been completely released from the boot, the
boot will tend to return to the equilibrium position illustrated in
FIG. 2, thus drawing the piston 16 more deeply into the cylinder
11, as indicated in FIG. 4.
* * * * *