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DESCRIPTION JPS5660207

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DESCRIPTION JPS5660207
BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a partially cutaway side view showing a use
example of a conventional mounting screw, and FIGS. 2 and 3 show different embodiments of the
mounting screw according to the present invention, respectively FIG. 4 is a lateral tooth of an
essential part showing a state of use of the attachment screw, a part of which is cut. 1 ... screw
head, 2 ... ... screw shaft, 3 ------ screw part, 4 ... ... no thread part, 5 ... - enlarged part .
DETAILED DESCRIPTION OF THE PROBLEM The present invention relates to an improvement of
a mounting screw used for attaching a pickup cartridge to a head shell or the like. As shown in
FIG. 1, the conventional screw A with a screw head has the same diameter from the lower side
(referring to the part in contact with the screw * C) of the screw shaft B to the tip, and this
mounting screw AK Since the gap between the mounting hole E and the mounting screw A is
about 0.05 to 0.1 when the head shell F [JIj is attached to the pickup cartridge D through the
mounting hole E, the pickup cartridge D Since A is provided with salt 9 in parallel with the center
line of the head shell F, Kid (a visual work '1' / dead 'pan' 'is necessary, which is cumbersome and
inaccurate for the user It was. When the pickup cartridge A is not attached in parallel, the
horizontal tracking error angle increases to cause alignment to generate distortion, so that it can
not be ignored by the user. For this reason, In fact it is the fact that the installation work is
carried out. Therefore, in order to solve the above-mentioned drawbacks, the present invention
attaches the pickup cartridge to the head shell by forming an enlarged portion having a diameter
somewhat larger than the outer diameter of the threaded portion with an elastic material on the
screw headed screw shaft , There is no looseness due to interference fit by degree of press fitting
to the mounting hole of the cartridge to eliminate unnecessary resonance at the time of
mounting and the parallelism at the time of attaching the pickup cartridge to the head shell is
poor It is an object of the present invention to provide a mounting screw for a pickup cartridge
or the like which is made possible by such a work. DETAILED DESCRIPTION OF THE PREFERRED
EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to
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embodiments shown in the accompanying drawings. FIGS. 2 and 3 show a second embodiment of
a mounting screw (2) 1 according to the present invention, , In the figure, 1 is a screw head, 2 is
a screw shaft, 3 is a threaded portion which creates a male screw, 4 is a threadless portion, 4 is
nylon, polyoxymethylene 5), an enlarged portion 5 having a diameter slightly larger than the
outer diameter of the threaded portion 3 is formed by a material having an elastic force such as a
leaf spring, etc. 5a is formed on the outer peripheral surface of the enlarged portion 5 and has a
tapered surface . In this embodiment, the company, the enlarged part 5 in the embodiment of
FIG. 2 has a cylindrical shape, and a flange part protrudes inward toward the peripheral end on
the tapered surface 5 a side. On the other hand, on the outer peripheral surface of the screwless
s4 of the screw shaft 3, a ring having the same width as the enlarged portion 5 is formed in
contact with the back side 1a of the screw head 1. The enlarged portion 5 is fitted into the
circumferential groove 6 with the tapered surface 5 a facing the threaded portion 3 and a gap 7
is provided between the expanded portion 5 and the circumferential groove 6.
On the other hand, on the truth flow side in FIG. 3, the enlarged s 5 has a thin cylindrical shape
and its length is formed to be slightly longer than the middle length of the circumferential groove
6. In the enlarged portion 5, the peripheral edge on the tapered surface 5 side was fitted in the
+311 forming groove on the side of the threaded portion 3 of the circle 6 and the other
peripheral edge was formed on the back surface 1 aK of the screw head 1 And is inserted so as to
be freely movable in the side groove. In the above two embodiments, the screw shaft 3 and the
enlarged s5 are separate bodies, but in the case where the screw shaft 3 (including the screw
head 1) is made of engineering plastics such as polyoxymethylene, the enlarged portion 5 can be
integrally formed with the screw shaft 3. The operation of the mounting screw according to the
present invention will now be described with reference to the case of attaching the pickup
cartridge 8 of FIG. 4 to the head shell 9. The mounting screw is inserted into the mounting hole
10 of the pickup cartridge 8, , When the tapered surface 5a of the enlarged s5 comes into
contact with the opening peripheral shoulder 11110m of the mounting hole 10 and further
screws the mounting screw, the enlarged portion 5 contracts inward against the resilient force ,
That phase advances forward by pushing the inner peripheral surface of the mounting hole 10.
Thus, when the back surface 1 a of the screw head 1 comes into contact with the opening
shoulder portion 10 of the mounting hole 10, the enlarged portion 5 is retracted in the fitting
hole 10 in the fitted state. (4) 'As described above, the present invention is an attachment screw
in which an enlarged portion 5 having a diameter somewhat larger than the outer diameter of
the screw s 3 is formed on an unscrewed screw W 64 of the screw shaft 2 with a screw head 1
by an elastic material. Therefore, in the case where the pickup cartridge 8 is not attached to the
head shell 9 by this mounting screw, since the enlarged portion 5 is fitted into the mounting hole
10 in a interference fitted state, unnecessary resonance disappears, It is possible to attach the
pickup cartridge 8 in parallel to the head shell 9 easily and quickly without using nerves and it is
possible to minimize the horizontal tracking error angle. It is a matter of course that the
mounting screw according to the present invention can not be used only for mounting the pickup
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cartridge 8 but can be used for all mountings as well as general-purpose screws.
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