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

Injection molded mushroom type hook structure and hook strap including the same

a technology of injection molding and hook straps, which is applied in the field of injection molding mushroom type hook structure and hook straps, can solve the problems of insufficient fastening strength, sharp drop in fastening capability, and relative low effective engagement percentage, and achieve the effect of balancing the effective engagement rate and the effective engagement strength of the hook to the loop

Inactive Publication Date: 2019-08-01
TAIWAN PAIHO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The present invention provides a new type of injection molded hook structure that can better balance the rate at which it engages with a loop and the strength of that engagement. This structure also maintains consistency in both the machine direction and the transverse direction.

Problems solved by technology

However, when engaging the circular-headed mushroom-type hooks illustrated in FIG. 1 with the fabric loops on the loop strap, the effective engaging percentage is relative low because the smooth periphery of the circular head of the hook does not provide protruding portions that can engage with the fabric loops, and thus has a drawback of unable to provide sufficient fastening strength.
However, although this lockup type of engagement may provide a firm engagement, the fabric loops usually will be destroyed by the hooks during a detaching operation between the hook strap and the loop strap, and after several times of engaging / detaching operations the fastening capability will drop sharply or even loosing the fastening capability because the percentage of the loops been destroyed increases as the engaging / detaching operation number increases.
As a result, the effective lifetime of the circular-headed mushroom-type hooks is relative short.
Additionally, because the engagement between the head portion and the loops is provided by the protrusions of the head portion, insufficient engagement strength between the hooks and the loops may occur at times.

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
  • Injection molded mushroom type hook structure and hook strap including the same
  • Injection molded mushroom type hook structure and hook strap including the same
  • Injection molded mushroom type hook structure and hook strap including the same

Examples

Experimental program
Comparison scheme
Effect test

first embodiment

[0049]FIG. 3 is a schematic perspective view showing an injection molded mushroom type hook structure 300 according to the present invention; FIG. 4 is an end view of the injection molded mushroom type hook structure 300 of FIG. 3; and FIG. 5 is a top plane view of injection molded mushroom type hook structure 300 of FIG. 3.

[0050]As shown in FIGS. 3-5, the injection molded mushroom type hook structure 300 according to this embodiment mainly includes a stem portion 310 and a head portion 320 integrally formed at a top end of the stem portion 310. In this embodiment, the stem portion 310 is a substantially tetragonal shape including two straight vertical side walls in a first direction (also referred as a transverse direction) CD, a straight vertical side wall and a slanted side wall in a second direction (also referred as a machine direction) MD, wherein the first direction CD and the second direction MD are perpendicular with each other as shown in FIGS. 3-4. The head portion 320 is...

second embodiment

[0051]Next, references are made to FIGS. 6 to 8 to describe an injection molded mushroom type hook structure 400 according to the present invention, wherein FIG. 6 is a schematic perspective view showing the injection molded mushroom type hook structure 400; FIG. 7 is an end view of the injection molded mushroom type hook structure 400 of FIG. 6; and FIG. 8 is a top plane view of injection molded mushroom type hook structure 400 of FIG. 6.

[0052]As illustrated in FIGS. 6-8, the injection molded mushroom type hook structure 400 of this embodiment has a structure substantially the same as that of the injection molded mushroom type hook structure 300 of the first embodiment. That is, the injection molded mushroom type hook structure 400 includes a stem portion 410 and a head portion 420 integrally formed at a top end of the stem portion 410. The main differences between the injection molded mushroom type hook structure 400 of this embodiment and the injection molded mushroom type hook s...

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

PropertyMeasurementUnit
lengthaaaaaaaaaa
radius of curvatureaaaaaaaaaa
mechanicalaaaaaaaaaa
Login to View More

Abstract

One aspect of the present invention provides an injection molded mushroom type hook structure. The injection molded mushroom type hook structure of the present invention includes a stem portion and a substantially planar head portion formed at a top end of the stem portion, wherein the head portion includes two protrusion portions extending outwardly at two opposite sides of the head portion in a first direction, at least one extended portions extending outwardly from one side of the head portion in a second direction substantially perpendicular to the protrusions, and four connection portions that are formed at locations where the lateral sides of the two protrusion portions meet adjacent extended portion and the head portion. These structural features allow the injection molded mushroom type hook structure of the present invention to have a substantially same hook-to-loop engagement rate in each direction and an improved hook-to-loop engagement / peeling-off strength. Another aspect of the present invention provides an injection molded hook strap including the hook structure.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application is a Divisional of U.S. application Ser. No. 15 / 281,161, filed on Sep. 30, 2016, which claims priority under 35 U.S.C. § 119(a) on Patent Application No. 104140462, filed in Taiwan on Dec. 3, 2015, the contents of each are hereby expressly incorporated by reference into the present application.FIELD OF THE INVENTION[0002]The present invention relates generally to mechanical fasteners, and more specifically to an injection molded mushroom type hook structure and a hook strap including the same.BACKGROUND OF THE INVENTION[0003]Hook-and-loop type fastener is one of the mechanical surface fastener types and it is known as a “Velcro” type fastener. A hook-and-loop type fastener mainly includes a hook strap and a loop strap, wherein the hook strap includes a plastic substrate and a plurality of injection molded hooks formed on a surface of the substrate, and the loop strap has a plurality of fabric loops formed thereon to engag...

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 Applications(United States)
IPC IPC(8): A44B18/00
CPCA44B18/0065A44B18/0049A44B13/0035B29L2031/729
Inventor CHENG, CHENG-WEI ALLEN
Owner TAIWAN PAIHO LTD