Locking structure of pivot arm of inverting machine

Details Locking structure of pivot arm of inverting machine Locking structure of pivot arm of inverting machine

2000-02-01

2002-02-05

Krizek, Janice L. (Department: 3652)

Exercise devices

Support for entire body of user

Suspension device

C005S610000

Reexamination Certificate

active

06344017

ABSTRACT:

FIELD OF THE INVENTION
The present invention relates generally to an inverting machine, and more particularly to a locking structure of pivot arm of the inverting machine.
BACKGROUND OF THE INVENTION
As shown in
FIGS. 1 and 2
, an inverting machine of the prior art comprises an inverting platform
11
which is provided in two sides thereof with a pivot arm
12
, and a leg frame
13
having two pivoting ends which arc provided with a slot
14
for pivoting a pivot pillar
15
of the pivot arm
12
. Each of the two pivot arms
12
is of a long platelike construction and is provided with three through holes
16
. The inverting platform
11
is provided in two sides thereof with a receiving member
17
which has a bottom wall
171
and is provided in two sides thereof with a raised side wall
172
. These two side walls
172
are provided inwardly and oppositely with a stop portion
173
which is separated from the bottom wall
171
by a distance slightly greater than the thickness of the pivot arm
12
. The receiving member
17
is provided with an insertion slot
174
. The receiving member also has a locating pillar
175
. The pivot arm
12
is inserted into the insertion slot
174
of the receiving member
17
such that one of the three through holes
16
of the pivot arm
12
is engaged with the locating pillar
175
.
In view of the pivot arm
12
being retained only by the receiving member
17
, there is a considerably large gap between them. As a results there is always a noise caused by the collision of metals at such time when the inverting machine of the prior art is in use. In addition, the inverting machine in operation is susceptible to a slight sway, thereby causing its user to have an insecure feeling. Moreover, an incorrect assembly of the prior art inverting machine can result in a serious consequence The case in point is that some absent-minded or careless users are likely to insert the entire pivot arm
12
into the insertion slot
174
of the receiving member
17
without retaining the locating pillar
175
in one of the three through holes
16
.
SUMMARY OF THE INVENTION
It is the primary objective of the present invention to provide an inverting machine with a pivot arm locking structure which is structurally secure and is relatively free from noise when in operation.
It is another objective of the present invention to provide an inverting machine with a pivot arm locking structure which is foolproof.
In keeping with the principle of the present invention, the foregoing objectives of the present invention are attained by an inverting machine comprising a Icg frame, two pivot arms, and a inverting platform. The leg frame has two pivoting ends which arc provided with a slot. The two pivot arms are of a long platelike construction and are provided with a plurality of locating through holes. The pivot arms are provided at one end thereof with a pivoting pillar which is pivoted in the slot of the leg framc The inverting platform is provided in two sides thereof with a receiving member which has a retaining slot for retaining the pivot arm The retaining slot is provided in the bottom wall thereof with a locating pillar which is received in one of the through holes of the pivot arm. The present invention is characterized by the receiving member which is provided with a locking member for locating the pivot arm securely with the receiving member.


REFERENCES:
patent: 5551937 (1996-09-01), Kwo
patent: 5967956 (1999-10-01), Teeter

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