U.S. patent application number 13/712994 was filed with the patent office on 2014-06-19 for control device for fastening strap unit.
The applicant listed for this patent is Wu-Chih Hsieh. Invention is credited to Wu-Chih Hsieh.
Application Number | 20140166800 13/712994 |
Document ID | / |
Family ID | 50929802 |
Filed Date | 2014-06-19 |
United States Patent
Application |
20140166800 |
Kind Code |
A1 |
Hsieh; Wu-Chih |
June 19, 2014 |
CONTROL DEVICE FOR FASTENING STRAP UNIT
Abstract
A fastening strap unit includes a frame with a mandrel and a
strap connected thereto. The strap is wrapped to the mandrel, and
the first end of the strap is fixed to the mandrel and a hook is
connected to the second end of the strap. A shaft extends from the
frame and a motor drives the shaft which drives the mandrel. A
first sensing chip is connected to the second end of the strap and
a second sensing chip is connected to the first end of the strap. A
sensor is connected to the frame so as to detect the first sensing
chip or the second sensing chip when the strap is retracted or
released to its final position, and the motor is stopped.
Inventors: |
Hsieh; Wu-Chih; (Taichung
City, TW) |
|
Applicant: |
Name |
City |
State |
Country |
Type |
Hsieh; Wu-Chih |
Taichung City |
|
TW |
|
|
Family ID: |
50929802 |
Appl. No.: |
13/712994 |
Filed: |
December 13, 2012 |
Current U.S.
Class: |
242/390.1 |
Current CPC
Class: |
B65H 2701/1313 20130101;
B65H 2701/1311 20130101; B65H 18/10 20130101; B65H 26/06 20130101;
B65H 2511/514 20130101; B65H 26/063 20130101; B65H 2301/415
20130101; B65H 2301/41461 20130101 |
Class at
Publication: |
242/390.1 |
International
Class: |
B65H 16/10 20060101
B65H016/10; B65H 18/10 20060101 B65H018/10 |
Claims
1. A fastening strap unit comprising: a frame having a mandrel and
a strap connected thereto, the strap wrapped to the mandrel, the
strap has a first end fixed to the mandrel and a hook connected to
a second end of the strap, a shaft extending from the frame and a
motor driving the shaft which drives the mandrel, a first sensing
chip connected to the second end of the strap and a second sensing
chip connected to the first end of the strap, and a sensor
connected to the frame and detecting the first sensing chip or the
second sensing chip to stop the motor.
2. The unit as claimed in claim 1, wherein each of the first and
second sensing chips is a metal chip.
Description
BACKGROUND OF THE INVENTION
[0001] (1) Field of the Invention
[0002] The present invention relates to a fastening strap unit, and
more particularly, to a control device for a fastening strap unit
so as to protect the motor when the strap is released or retracted
to the final position.
[0003] (2) Description of the Prior Art
[0004] The conventional fastening strap unit is usually used to
secure an object such as a wheelchair, machine and box, and
generally comprises a mandrel, a strap, an operation device and a
motor. The strap is wrapped to the mandrel and can be released or
retracted relative to the mandrel. The motor drives the operation
device to release and retract the strap. The strap has a hook which
is hooked to the object and the strap is released or retracted to a
desired length so as to position the object in a vehicle or a fixed
object.
[0005] However, if the strap is overly released or retracted, the
motor will be overloaded to damage the power system of the
unit.
[0006] The present invention intends to provide a control device
for a fastening strap unit and the movement of the strap
automatically stops to protect the motor.
SUMMARY OF THE INVENTION
[0007] The present invention relates to a fastening strap unit and
comprises a frame having a mandrel and a strap connected thereto.
The strap is wrapped to the mandrel. The strap has a first end
fixed to the mandrel and a hook is connected to a second end of the
strap. A shaft extends from the frame and a motor drives the shaft
which drives the mandrel. A first sensing chip connected to the
second end of the strap and a second sensing chip is connected to
the first end of the strap. A sensor is connected to the frame and
detects the first sensing chip or the second sensing chip to stop
the motor.
[0008] The primary object of the present invention is to provide a
control device of a fastening strap unit, the motor is stopped when
the strap is released or retracted to its final position, such that
the motor is protected from being overloaded.
[0009] The present invention will become more obvious from the
following description when taken in connection with the
accompanying drawings which show, for purposes of illustration
only, a preferred embodiment in accordance with the present
invention.
BRIEF DESCRIPTION OF THE DRAWINGS
[0010] FIG. 1 is a perspective view to show the fastening strap
unit of the present invention;
[0011] FIG. 2 is a perspective view to show the strap wrapped to
the mandrel and the strap has a hook and a sensing chip;
[0012] FIG. 3 is a plan view to show that the strap is retracted to
the mandrel;
[0013] FIG. 4 is a plan view to show the fastening strap unit of
the present invention, and
[0014] FIG. 5 is a plan view to show that the strap is released
from the mandrel.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT
[0015] Referring to FIGS. 1 to 5, the fastening strap unit of the
present invention comprises a U-shaped frame 10 and a board 11
extends from two sides of the frame 10. A mandrel 12 and a strap 13
are located between two sidewalls of the frame 10 and the strap 13
is wrapped to the mandrel 12. The mandrel 12 is rotatably connected
between the two sidewalls of the frame 10. The strap 13 has the
first end fixed to the mandrel 12 and a hook 133 is connected to
the second end of the strap 13. A first sensing chip 131 is
connected to the second end of the strap 13 and a second sensing
chip 132 is connected to the first end of the strap 13. In this
embodiment, each of the first and second sensing chips 131, 132 is
a metal chip. A sensor 15 is connected to the frame 10 and detects
the first sensing chip 131 or the second sensing chip 132 to stop
the motor 50.
[0016] A shaft 122 co-axially connected to the mandrel and extends
from the frame 10. The motor 50 drives the shaft 122 which drives
the mandrel 12 so as to release or retract the strap 13.
[0017] The frame 10 is fixed to a fixed object such as a vehicle by
the board 11, and the strap 13 is pulled to an object such as a
wheelchair (not shown), the hook 133 hooks to the object and the
mandrel 12 and the strap 13 are stopped. Therefore, the object is
positioned by the strap 13 as shown in FIG. 3.
[0018] When retrieving the strap 13, the hook 133 is unhooked from
the object, the motor 50 is activated to drive the shaft 122 and
the mandrel 12 to retract the strap 13. It is noted that the user
can simply pull the strap 13 and to hook the hook 133 to the object
manually. The retrieving of the strap 13 can be done by using the
motor 50.
[0019] When the strap 13 is released or retracted, the sensor 15
detects the first sensing chip 131 or the second sensing chip 132
passing there by, and the detection sends a signal to the motor 50
to stop the motor 50. By this way, the motor 50 is stopped and
protected when the strap 13 is released or retracted to its final
position.
[0020] While we have shown and described the embodiment in
accordance with the present invention, it should be clear to those
skilled in the art that further embodiments may be made without
departing from the scope of the present invention.
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