Unlock instant, AI-driven research and patent intelligence for your innovation.

Constant force rail clamp

A technology of track clamps and clamps, which is applied in the field of hydraulically released brakes and spring actuation, and can solve the problems of braking force drop and spring force drop

Active Publication Date: 2014-11-05
HILLMAR IND LTD
View PDF5 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Correspondingly, the braking force drops due to the drop in spring force caused by the elongation of the spring

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Constant force rail clamp
  • Constant force rail clamp
  • Constant force rail clamp

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0015] See attached picture and see first figure 1 , figure 1 A spring actuated, hydraulically released braking mechanism in the form of a constant force rail clamp 10 is shown. Rail clamp 10 is a new type of wedge clamp that maintains a constant braking or clamping force between the rail and opposing clamping levers despite differences in applied spring force. The rail clamp 10 has a frame 12 which in this example includes four spaced apart guide posts 14 , 16 , 18 and 20 . Guide posts 14 , 16 , 18 and 20 connect a pair of mounting plates 20 and 24 to a spring mechanism 28 . A first pair of guide posts 14 and 16 connects a first 22 of the mounting plates to a top plate 26 of a spring mechanism 28 . A second pair of guide posts 18 and 20 connects a second 24 of the mounting plates to a top plate 26 of a spring mechanism 28 . As shown by one of the guide posts 14 , each guide post has a threaded first end 13 which threadably engages a corresponding one of the mounting plate...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

No PUM Login to View More

Abstract

A rail clamp comprises a frame and a pair of levers. Each of the levers has a brake pad at a first end thereof, a cam follower at second end thereof, and is mounted to the frame by a pivot disposed between said first and second ends. A cam is disposed between the levers and a spring biases the cam in a first direction. A clamp release actuator is operable to displace the cam in a second direction. The second direction is opposite to the first direction. A pair of variably sloped cam surfaces are disposed on opposite sides of the cam. Each of the variably sloped cam surfaces is in contact with the cam follower of a corresponding one of the levers, and each of the variably sloped cam surfaces has a slope which varies to counteract variations in a spring force of the spring as the cam is displaced, thereby maintaining a constant clamping force.

Description

technical field [0001] This invention relates to rail clamps, and more particularly to spring-actuated, hydraulically released brakes for cranes and other material handling equipment. Background technique [0002] Track clamps are well known. US Patent No. 3,972,392, issued August 3, 1976 to Norman Alan Johnson, discloses a fail-safe track clamp adapted to grip both sides of a crane track. A pair of clamping levers are provided with brake shoes at their first ends to allow a clamping fit with opposite sides of the track. A second end of the clamp lever is pivotally connected to the actuation link to form a toggle mechanism. A compression spring acts on the toggle mechanism to pivot the clamping lever, thereby urging the first end of the clamping lever to engage the track. However, the mechanism ratio of the clamp lever and toggle mechanism changes faster than the spring force. Correspondingly, with narrow tracks or worn brake shoes, the clamping force is high even for sm...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): B61H7/12B25B1/08B25B5/08B61H13/28B66C9/18F16D65/18F16D65/22
CPCF16D65/14F16D63/008F16D2121/12B61H7/12F16D2125/66
Inventor 伊格尔·贝林特
Owner HILLMAR IND LTD