Tools – Wrench – screwdriver – or driver therefor – Responsive to torque on work
Reexamination Certificate
2000-08-03
2001-12-25
Smith, James G. (Department: 3723)
Tools
Wrench, screwdriver, or driver therefor
Responsive to torque on work
C081S468000
Reexamination Certificate
active
06332383
ABSTRACT:
BACKGROUNDS OF THE INVENTION
1. Field of the Invention
The present invention relates to a fastening torque control tool of a fastening device for making constant the fastening torque by a fastening material, that is the joint strength, in fastening by use of the fastening material such as a bolt or a screw.
2. Description of the Related Art
As illustrated in FIG.
5
and
FIG. 6
, for example, in a case
3
consisting of a top box
1
and a bottom box
2
coming into contact with the top box
1
, the top box
1
is connected to the bottom box
2
by a plurality of bolts
4
which act as fastening devices and which extend through the top box
1
, in the conventional technique.
In these drawings, a concave portion
5
is formed on the top surface of the top box
1
, and a through hole
6
of a smaller diameter than that of the concave portion
5
is formed continued from the concave portion
5
. A tapped hole
7
positioned along the same axis as that of the through hole
6
is formed on the inside of the bottom box
2
. After bringing the bottom box
2
into contact with the top box
1
, the bolt
4
as the fastening device is inserted into the concave portion
5
and the through hole
6
. The bolt
4
is screwed down into the tapped hole
7
of the bottom box
2
, thereby connecting both boxes
1
and
2
.
The bolt
4
, that is, for example, a hexagon socket head cap screw, is screwed by a hexagonal wrench
8
as a fastening instrument.
This fastening method requires management of the fastening torque, in some cases, in order to prevent the occurrence of disadvantages such as looseness after fastening. Management of the fastening torque is also required to make the fastening forces of a plurality of fastening devices uniform.
The above-mentioned torque control is performed by using a tool provided with a torque control function, such as a torque wrench, in the manufacturing line or the assembly line of a factory.
Under present conditions, however, at the assembly time or maintenance time in the site, the above-mentioned tool provided with the torque control function is rarely used. The torque control cannot help relying on the sense of a worker, and the constant fastening torque cannot be always obtained.
Even if fastening can occur with the tool provided with the torque control function in the factory, there is a possibility that the fastening will be performed by a torque other than the established torque. Moreover, once it is fastened, it is impossible to confirm the fastening torque.
SUMMARY OF THE INVENTION
To solve the conventional problem, an object of the present invention is to provide a fastening torque control tool of a fastening device capable of confirming the fastening torque of the fastening device that has been fastened, regardless of whether the fastening occurs at the factory or at the site.
According to one aspect of the invention, a fastening torque control tool of a fastening device comprises
a base portion fixed into a head portion of the fastening device in a way of restricting relative rotation around its axis, and
an operational portion, integrally provided with the base portion on the same axis, which a fastening instrument to turn the fastening device is fixed into in a way of restricting relative rotation around the axis,
wherein a separating portion for separating the operational portion from the base portion when a fastening torque applied to the operational portion reaches a predetermined value is formed between the base portion and the operational portion.
In the preferred construction, the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion.
In another preferred construction, the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion, and
the thin portion is formed on the whole circumference of the operational portion.
In another preferred construction, the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion, and
the thin portion is formed at a plurality of positions at predetermined intervals in the circumferential direction of the operational portion.
In another preferred construction, the base portion is formed so as to be attached to the head portion of the fastening device in a state of the operational portion being separated.
In another preferred construction, the base portion is formed so as to be attached to the head portion of the fastening device in a state of the operational portion being separated, and
the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion.
In another preferred construction, the base portion is formed so as to be attached to the head portion of the fastening device in a state of the operational portion being separated,
the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion, and
the thin portion is formed on the whole circumference of the operational portion.
In another preferred construction, the base portion is formed so as to be attached to the head of the fastening device by being fixed into the head of the fastening device in a pressed state, when the operational portion is separated.
In another preferred construction, the base portion is formed so as to be attached to the head of the fastening device by being fixed into the head of the fastening device in a pressed state, when the operational portion is separated, and
the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion.
In another preferred construction, the base portion is formed so as to be attached to the head portion of the fastening device by an adhesive agent applied to a connected portion of the base portion with the head portion of the fastening device and, in a state of the operational portion being separated.
In another preferred construction, the base portion is provided with a marking function for marking the fastening device when the base portion is fixed into the fastening device.
In another preferred construction, the base portion is provided with a marking function for marking the fastening device when the base portion is fixed into the fastening device, and
the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion.
In another preferred construction, the base portion is provided with a marking function for marking the fastening device when the base portion is fixed into the fastening device, and
the base portion is formed so as to be attached to the head portion of the fastening device in a state of the operational portion being separated.
In another preferred construction, the base portion is provided with a marking function for marking the fastening device when the base portion is fixed into the fastening device, and
the marking function is executed by applying colorant on the connected surface of the base portion with the fastening device and attaching the colorant to the head of the fastening device when the base portion is fixed into the head of the fastening device.
In another preferred construction, the head of the fastening device is a hexagonal pole, and a hexagonal socket to fix the head therein is formed on the base portion of the fastening torque control tool.
In another preferred construction, the head of the fastening device is a hexagonal pole, and a hexagonal socket to fix the head therein is formed on the base portion of the fastening torque control tool, and
the separating portion is formed by making thin a connected portion of the operational portion and the base portion as a thin portion.
In another preferred construction, the head of the fastening device is a hexagonal pole, and a hexagonal socket to fix the head therein is formed on the base portion of the fastening torque control tool,
Foley & Lardner
NEC Corporation
Shakeri Hadi
Smith James G.
LandOfFree
Fastening torque control tool in fastening device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fastening torque control tool in fastening device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fastening torque control tool in fastening device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2556617