U.S. patent application number 10/838569 was filed with the patent office on 2004-10-21 for winding spool.
Invention is credited to Hafner, Manfred.
Application Number | 20040206850 10/838569 |
Document ID | / |
Family ID | 7964147 |
Filed Date | 2004-10-21 |
United States Patent
Application |
20040206850 |
Kind Code |
A1 |
Hafner, Manfred |
October 21, 2004 |
Winding spool
Abstract
The invention relates to a winding spool, made of two spool
bodies stuck to each other, which has a cylindrical reel barrel and
two lateral spool flanges, the abutting surfaces extending
radially, preferably, in the middle of said winding barrel. Said
winding spool also comprises adhesive tongues, which are formed on
said abutting surfaces and engage into corresponding insertion
pockets of the other respective spool body. The aim of the
invention is to optimally design the joining area of both spool
bodies, in order to provide the rotational accuracy as well as to
avoid edges and deformations in said joining area. Said aim is
achieved, whereby the winding spool is deigned, such that the spool
bodies are joined to each other positively or non-positively and
the application force, which acts on the contact surfaces, is
increased. The adhesive tongues, projecting from said abutting
surfaces, extend in the shape of a semicircle and the insertion
pockets have corresponding shape. Moreover, said adhesive tongues
have flattenings on the free ends thereof and said insertion
pockets have corresponding inner areas. Said winding spool is
particularly suitable for winding components for producing
electronic components.
Inventors: |
Hafner, Manfred;
(Leopoldshohe, DE) |
Correspondence
Address: |
Attn: Arlene J. Powers
Gauthier & Connors, LLP
Suite 3300
225 Franklin Street
Boston
MA
02110
US
|
Family ID: |
7964147 |
Appl. No.: |
10/838569 |
Filed: |
May 4, 2004 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
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10838569 |
May 4, 2004 |
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PCT/EP02/12128 |
Oct 31, 2002 |
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Current U.S.
Class: |
242/609.4 |
Current CPC
Class: |
B29C 66/1142 20130101;
B29L 2031/704 20130101; B29C 66/225 20130101; B29C 66/54 20130101;
B29C 66/5344 20130101; B65H 2701/513 20130101; B29C 65/48 20130101;
B65H 75/14 20130101; B29C 65/56 20130101; B29C 66/221 20130101 |
Class at
Publication: |
242/609.4 |
International
Class: |
B65H 075/18 |
Foreign Application Data
Date |
Code |
Application Number |
Nov 17, 2001 |
DE |
20118783.3 |
Claims
What is claimed is:
1. Winding spool, especially for band- and thread-shaped winding
material, with a cylindrical winding barrel and two lateral spool
flanges, and which is formed from two spool bodies glued together,
wherein the joint surfaces run radially, preferably in the middle
of the winding barrel, and the connection region has glue tongues
formed alternately on the spool bodies, which engage with
corresponding insert pockets of the other particular spool body,
wherein to increase the pressing force acting on the contact
surfaces of the connection region, the spool bodies have both a
positive fit and a force fit with each other.
2. The winding spool according to claim 1, wherein the glue
tongues, projecting relative to the joint surfaces, run in an arc,
preferably a semicircle, and the insert pockets have a
corresponding shape.
3. The winding spool according to claim 1, wherein the glue tongues
projecting relative to the joint surfaces have flattenings at the
free sides opposite the joint surfaces, and the insert pockets have
corresponding filler pieces.
4. The winding spool according to claim 1, wherein the glue tongues
projecting relative to the joint surfaces have bevels at the free
sides opposite the joint surfaces, which lie facing the axis of
rotation of the winding spool.
5. The winding spool according to claim 3, wherein the glue tongues
projecting relative to the joint surfaces are rectangular or
quadrangular in shape.
Description
BACKGROUND OF THE INVENTION
[0001] 1. Field of the Invention
[0002] The invention relates to a winding spool, especially for
band- and thread-shaped winding material. The spool has a
cylindrically shaped winding barrel and two side flanges, and is
formed from two spool bodies glued together, wherein the joint
surfaces run radially, preferably in the middle of the winding
barrel. The connection zone has glue tongues alternately formed on
the spool body, which engage with corresponding insert pockets at
the other spool body.
[0003] 2. Description of Prior Art
[0004] The winding spools at issue are preferably wound with wires,
which are used for the manufacture of electronic devices. In a
preferred embodiment, the two spool bodies are identical in
structure so that they can be made with the same tool. Since the
winding material is wound on with a relatively fast winding speed,
the winding spool rotates at a correspondingly high runs per minute
and with a minimum run out, without eccentricity on flange and
barrel. The winding spools known thus far have worked quite well in
practice, although the joining of the two spool bodies has not
always been satisfactory. Furthermore, the glue tongues would
project at the ends, so that edges would form at the surface of the
winding barrel.
SUMMARY OF INVENTION
[0005] The goal of the invention is to configure a winding spool of
the type described at the outset so that the joint region of the
two spool bodies has an optimal configuration, thus ensuring
minimum run out, without excentricity on flange and barrel, and
preventing any deformations or edges in the joint region.
[0006] This goal is achieved in that the spool bodies have both a
positive fit and a force fit with each other in order to increase
the pressing force acting on the contact surfaces of the joint
region.
[0007] Since the joint regions are now configured to increase the
pressure acting on the contact surfaces being glued together, as
compared to the known designs, this results in an improved
connection. The glue tongues and the insert pockets are matched up
so that the glue tongues fit into the insert pockets and at the
same time are held by adherence. A smooth surface is always
achieved in every position. Undercuts are provided so that the
tongues are pulled into the correct position.
[0008] It has been discovered that, when the spool bodies are
provided with quadrangular or rectangular glue tongues and insert
pockets, the free ends of the glue tongues have a tendency to
deform when joined together, so that the free ends project relative
to the feet of the glue tongues. To overcome this drawback, in a
preferred embodiment it is specified that the glue tongues
projecting relative to the joint surface have the course of an arc,
preferably a semicircle, and the insert pockets have a shape
adapted to this. However, this not only prevents the projecting of
the ends of the glue tongues, but also achieves the largest
possible contact surfaces for the gluing of the two spool bodies
together. Although no force from the outside acts on the glue
tongues that would force down the tips of the tongues, the
so-called projecting is prevented because now the connection region
is created such that a corresponding opposing force acts on the tip
of each tongue. In this embodiment, the pattern of the glue tongues
and the insert pockets of each spool body is undulated. In order to
further reduce the danger of the free end regions of the glue
tongues from becoming deformed, the arc-shaped glue tongues of each
spool body have flattened sections at the free sides away from the
joining edge, and the insert pockets have corresponding filler
pieces, so that a continuous contact surface is formed. It is
furthermore possible for the free ends of the glue tongues away
from the joint edge to have a bevel at the sides facing the insert
pockets. This further reduces the danger of projecting. Since the
glue tongues are provided with flattened sections or bevels, it is
also possible to make the glue tongues and the insert pockets in a
rectangular or quadrangular shape. It should be further pointed out
that the spool bodies are made from a single piece of plastic in
the injection molding process.
BRIEF DESCRIPTION OF THE DRAWINGS
[0009] The invention will now be explained in greater detail with
reference to the enclosed drawings.
[0010] FIG. 1 is a preferred embodiment of a spool body in
perspective view;
[0011] FIG. 2 shows two spool bodies according to FIG. 1, in the
separated state;
[0012] FIG. 3 shows the two spool bodies of FIG. 2 in the joined
state;
[0013] FIG. 4 shows the joint region of the two spool bodies in an
enlarged view; and
[0014] FIG. 5 shows a winding spool in the joined state, in a
second embodiment.
DETAILED DESCRIPTION OF THE INVENTION
[0015] The winding spool 10 consists of the two spool bodies 11,
12, which after being joined together according to FIG. 3 have both
a positive fit and a force fit with each other. The contact
surfaces are further joined together by gluing. The winding spool
10 consists of the two lateral flanges 13, 14 and a cylindrical
winding barrel 15, and in the sample embodiment depicted the joint
surfaces 16, 17 of the two spool bodies 11, 12 lie in the middle
between the two flanges 13, 14. The connection regions of the two
spool bodies 11, 12 consist of glue tongues 18 and insert pockets
19, which are arranged in alternation, i.e., the glue tongues 18 of
one spool body 11 or 12 stand opposite the insert pockets 19 of the
other spool body 11 or 12, as long as the bodies 11, 12 are not yet
joined together. In the joined state, the glue tongues 18 of one
body 11 or 12 lie in the insert pockets 19 of the other body 11 or
12.
[0016] As FIG. 2 shows in particular, the free end regions of the
glue tongues 18, opposite the spool flanges 13, 14, are provided
with flattened sections or with surfaces that run parallel to the
flanges 13, 14. The insert pockets 19 are provided with
corresponding filler pieces, so that again the point of bearing is
over a surface. When the spool bodies 11, 12 are fitted together,
the surfaces 20 prevent deformation outwardly or above the free end
regions of the glue tongues 18. The glue tongues 18, 19 and the
insert pockets 19 are matched to each other so that the two spool
bodies 11, 12 have both a positive fit and a force fit with each
other. Furthermore, the glue tongues 18 and the insert pockets 19
are designed so that a smooth outer surface is also provided in the
connection region of the winding barrel 15. It is expedient for the
thicknesses of the glue tongues 18 and the thicknesses in the
region of the insert pockets 19 to be equal. In the embodiment
according to FIGS. 1 to 4, the glue tongues and the insert pockets
19 are fashioned in semicircular shape in their basic outline,
i.e., apart from the surfaces 20. This produces an undulating
appearance of the glue tongues 18 and the insert pockets 19.
However, the glue tongues 18 and the insert pockets 19 could also
have a different arc shape. Instead of the surfaces 20, the glue
tongues 18 could be provided with bevels at the inner side facing
the axis of rotation of the winding spool 10. The insert pockets 19
would then have corresponding filler pieces, so that once again the
point of bearing is over a surface. In particular, FIG. 1 shows
that the depth of the insert pockets 19 corresponds to half or
approximately half the wall thickness of the winding barrel, so
that they run axially at the same level. The thicknesses of the
glue tongues 18 correspond. In particular, when the glue tongues 18
are provided with bevels, they could also have the quadrangular or
rectangular shape of FIG. 5.
[0017] The invention is not limited to the sample embodiments
depicted. The essential point is the positive fit and force fit of
the two spool bodies 11, 12 in the connection region of the winding
barrel 15. Preferably the glue tongues 18 and the insert pockets 19
are semicircular in shape.
* * * * *