Patent Application
20160090977
1. Field of the Invention
The present invention relates to the field of pulling devices, and in particular to a structure of a trigger-boosting pulling device, which comprises a T-shaped pull grip for initial induction of vacuum suction force and a handle comprising a trigger that is operable to supply a force that is subjected to doubling to increase the vacuum suction force.
2. The Related Arts
Although the early-invented hand-operated vacuum pulling device is effective to supply a vacuum suction force of 550 mbar, it is still insufficient to some extents in practical applications. Further, a pull stem 92 is pressed in a very effort consuming manner to compress the spring 91 arranged therein in order to allow the back springing of the spring 91 to induce vacuum. To obtain a strong vacuum suction force, the spring 91 must be selected and a thick and powerful spring 91 must be used. This, however, requires additional effort to compress the spring 91. The compression is difficult and additional physical strength is needed. This is a drawback to be improved.
Further, in the early-invented hand-operating vacuum pulling device, the backward ram 71 is of a unitary design and such a unitary design would lead to a great waste of material in the manufacturing thereof and the manufacturing is difficult, leading to an increased cost. Improvement is also needed in this respect.
Thus, in view of the drawbacks of the known device, it is desired to provide a solution that overcomes the drawbacks.
An object of the present invention is to provide a trigger-boosting pulling device, which comprises a T-shaped pull grip for inducting a suction force of an initial level and a handle having a trigger that is operable to supply a force that is doubled to increase the vacuum suction force.
To achieve the above object, the present invention provides a trigger-boosting pulling device, which comprises: an elongate shank, which comprises a backward ram slidably fit thereto, a suction cup, which is fixed to a rear end of the elongate shank, and a hand-operating pump structure, which is fixed to a front end of the elongate shank. The hand-operating pump structure comprises a T-shaped pull grip that is connected by a connection bar to a piston assembly. The connection bar comprises a spring fit thereto for position restoration of the pull grip. A handle is coupled to the outside of a pump cylinder and the handle comprises a trigger that drives, via a connection lever, the connection bar. As such, the T-shaped pull grip can be first pulled to induce a suction force to reach an initial level and then the handle is held by a hand and the trigger is pulled to drive the connection lever for doubling the force so as to induce enhanced vacuum suction force in the suction cup.
To achieve the above object, the present invention provides a trigger-boosting pulling device, which comprises a backward ram that is made of components that are manufactured separately to effectively reduce the cost and then assembled together.
To achieve the above object, the present invention provides a trigger-boosting pulling device, which comprises an elongate shank and a hand-operating pump structure between which a pressure relief seat is mounted. The pressure relief seat comprises an inner thread. A relief knob comprising an external thread is engageable with the inner thread of the pressure relief seat. The pressure relief seat has a circumference in which an aperture is formed and extends into the pressure relief seat, whereby tightening the relief knob makes the aperture blocked and not allowing for relief of vacuum and to release the vacuum, the relief knob is rotated open to allow air to flow through the aperture into the suction cup to release the vacuum.
The present invention will be apparent to those skilled in the art by reading the following description of preferred embodiments thereof, with reference to the attached drawings, wherein:
The present invention provides a design of a structure of a trigger-boosting pulling device.
For better understanding the objects, features, and effects of the present invention, a detailed description of an embodiment will be given with reference to the attached drawings.
Referring to
an elongate shank 10, the elongate shank 10 receiving a backward ram 11 slidably fit thereon;
a suction cup 20, the suction cup 20 being fixed to a rear end of the elongate shank 10;
a hand-operating pump structure 30, the hand-operating pump structure 30 being fixed to a front end of the elongate shank 10;
a pressure relief seat 40, the pressure relief seat 40 being mounted between the elongate shank 10 and the hand-operating pump structure 30, the pressure relief seat 40 having a bottom forming a ram stop section 41; and
a tube 50, the tube 50 being received in the elongate shank 10, the tube 50 communicating with the pressure relief seat 40 and the suction cup 20, wherein the hand-operating pump structure 30 comprises a check valve 56 and a piston assembly 51 arranged thereon, the check valve 56 and the piston assembly 51 being mounted to an end of a connection bar 52, the connection bar 52 comprising a spring 53 fit thereon, the connection bar 52 being arranged to extend through a pump cylinder 54, the connection bar 52 having a front end to which a T-shaped pull grip 55 is attached, the pump cylinder 54 having an outer circumference to which a handle 60 is attached, the handle 60 comprising a trigger 61 pivotally attached thereto, the trigger 61 being connected to a connection lever 62, the connection lever 62 having a free end in which a through hole 621 is formed, the through hole 621 receiving the connection bar 52 to extend therethrough, whereby repeatedly pulling the T-shaped pull grip 55 induces a vacuum suction force in the suction cup 20 that achieves a basic vacuum suction force of around 550 mbar and, subsequently, repeatedly pulling the trigger 61, which is subjected to force doubling by the connection lever 62 and supplied to pull the piston assembly 51 to increase the vacuum suction force of the suction cup 20 to a predetermined level of enhanced vacuum suction force of around 700 mbar.
The trigger-boosting pulling device is structured in such a way that components that make up the backward ram 11 can be manufactured separately so that the cost can be greatly reduced and then the separate components can be assembled together to form the backward ram 11.
The trigger-boosting pulling device is structured in such a way that the pressure relief seat 40 comprises an inner thread 401 and a relief knob 42 that comprises an external thread 421 is threadingly engageable with the inner thread 401 of the pressure relief seat 40. The pressure relief seat 40 has a circumference in which an aperture 43 is formed and extends into the pressure relief seat 40, whereby tightening the relief knob 42 makes the aperture 43 blocked and not allowing for relief of vacuum. To release the vacuum, the relief knob 42 is rotated open to allow air to flow through the aperture 43 into the suction cup 20 to release the vacuum.
Referring to
Referring to
As shown in
To this point, it is understood that the present invention provides a trigger-boosting pulling device, which comprises a T-shaped pull grip that is operable by being pulled by a user to induce a basic vacuum suction force and a hand comprising a trigger that is subsequently operable to boost the vacuum suction force.
Although the present invention has been described with reference to the preferred embodiment thereof, it is apparent to those skilled in the art that a variety of modifications and changes may be made without departing from the scope of the present invention which is intended to be defined by the appended claims.
