Hook device

• US 4,112,750 A
• Filed: 08/12/1976
• Issued: 09/12/1978
• Est. Priority Date: 08/12/1975
• Status: Expired due to Term

• Current Assignee: Oerlikon Contraves AG (Rheinmetall AG)
• Original Assignee: Nippon Hoist Co., Ltd.
• Inventors: Murakami, Sakae
• Primary Examiner(s): Ruehl, Charles A.
• Application Number:
  US05/713,803
• Time in Patent Office: 761 Days
• Field of Search: 73/141 AB, 73/143, 212/2, 212/39 R, 177/147, 340/267 C, 340/272
• US Class Current: 73/862.56
• CPC Class Codes: B66C 1/40 formed or fitted with load measuring or indicating devices
• CPC Class Codes: G01G 19/14 for weighing suspended loads G01G3/00 takes precedence; incorporation of weighing devices in cranes B66C1/40, B66C13/16
• CPC Class Codes: G01G 3/02 wherein the weighing element is in the form of a helical spring

Abstract

The present invention relates to a hook device with which safe handling operation can be assured. This device is constructed such that, as any load heavier than the predetermined weight is applied thereto, an eccentric shaft carrying a pulley for suspension thereof is rotated, and thereby an appropriate load indicating means is actuated. By use of the hook device according to this invention, a signal indicates to an operator that a load more than the predetermined level has been applied.

Claims

1. Hook device applicable to a crane, a hoist or the like device characterized by that said hook device comprises:

(a) a support means for supporting a hook,

(b) an eccentric shaft mounted rotatably on said support means,

(c) a pulley arranged rotatably on the eccentric portion of said eccentric shaft,

(d) a spring means connected to said shaft for urging said eccentric shaft in a specific direction, and

(e) a load indicating means connected to said eccentric shaft, said load indicating means being operable by rotation of said eccentric shaft when a load in excess of a predetermined weight is applied to said shaft, said load indicating means comprising an arm set fast to said eccentric shaft, two pins studded onto said arm, a pointer arranged rotatably on said support means, said pointer being between said pins for engagement with said pins whereby rotation of said shaft causes said pins to move with the movement of said pins thereby causing said pointer to rotate, an indication plate set fast to said support means, and said indication plate being located corresponding to the range of rotation of said pointer.

2. Hook device as set forth in claim 1, wherein said load indicating means comprises a lever extending radially from one side of said eccentric shaft, an alarm device, and switch means in the path of motion of said lever for actuating said alarm device in accordance with the movement of said lever.

3. Hook device applicable to a crane, a hoist or the like device comprising:

(a) support means for supporting a hook,

(b) a shaft mounted rotatably on said support means and having an eccentric portion,

(c) a pulley arranged rotatably on said eccentric portion of said shaft,

(d) a first lever extending radially from the portion of said shaft concentric with the axis of rotation, spring means for urging said shaft in a direction oposite the direction urged by a load acting on the hook, one end of said spring means reacting against a portion of said first lever radially spaced from said shaft, the other end of said spring means reacting against said support means,

(e) a second lever extending radially from a portion of said shaft concentric with said axis of rotation, said second lever having a path of motion in accordance with the rotation of said shaft, switch means on said support means in said path of motion of said second lever when said shaft rotates in the direction urged by the load whereby said second lever contacts and actuates said switch means when said second lever is moved to a predetermined position, alarm means on said support means actuatable by said switch means upon actuation of said switch means by said second lever, and

(f) said first lever and said second lever being at an angle to each other whereby said angle and the mounting of said spring means and of said switch means with respect to the lengths of said first and second levers determines when said alarm means will be actuated.

4. Hook devise as set forth in claim 3, wherein a load indicating plate is mounted on said support means, and load indicating means extending from said shaft for indicating on said plate an amount indicative of the load in accordance with the rotation of said shaft.