CA1048223A

CA1048223A - Fixing means

Info

Publication number: CA1048223A
Application number: CA76258312A
Authority: CA
Inventors: Jarmo Jarvinen
Original assignee: Individual
Current assignee: Individual
Priority date: 1976-03-16
Filing date: 1976-08-03
Publication date: 1979-02-13
Also published as: FR2344735B3; DE2617911A1; DE2617911B2; DE2617911C3; FR2344735A1; FI51728B; GB1499224A; FI51728C

Abstract

ABSTRACT OF THE DISCLOSURE

Fastener for securing a resilient thermal insulation blanket onto a base to form a surface to be walked on. The fastener has a washer-like thin disk applied over the blanket and having a central hole. A tubular depression member depends from one surface of the disk, this member having the form of an elongated wall of which the length is approximately half the thickness of the blanket. The wall has a bore in communication with the disk central hole and a bottom wall having a through passage of a diameter smaller than that of the base. A screw having a threaded stem and head is mounted in the well with the stem thereof extending through the passage through the well bottom wall. This screw is secured onto the base until the head stands generally at the bottom of the well.

Description

;Z3 The present invention relates to an attachment means for secuxing a resilient thermal insulation blanket onto a base to form a surface to be walked on, such as a roof surface.
Known fasteners of the above type have the disadvange that when the insulation blanket is compressed, for instancP
when it is walked on, the fastener is not correspondingly com- -pressed and becomes s~lient from the surface of the blanket.
Where the latter has been covered with roofing felt or the like covering, the top of the fastener will extend through it and damage it.
It is therefore an object of the invention to provide an attachment means which will follow easily any depression of ~ -the insulation blanket and will not allow any of its part to protrude from its surface.
More specifically, the attachment means of the invention comprises a washer-like generally flat and thin disk which ! in `
use, is applied over the blanket and which has a central hole.
A tubular depression member integrally depends from one surface of this disk, this member havlng the form of an elongated well of which the length is approximately half the thickness of the blanket. The well has a bore in communication with the disk central hole and a bottom wall having a through passage of a diameter smaller than that of the bore. A screw having a threaded stem and a head is unrestrainedly mountable in the well, the stem having a size- to freely extend through the bottom wall passage and a length to reach and securely fix the screw onto the base with the head then standing at the bottom wall in the well, in uncompressed condition of the blanket. The head is larger than the diameter of the passage and smaller than that of the bore.
In a preferred embodiment of the invention, the bottom wall is outwardly tapered and has a sharp end edge ~ 9L8;~2~ ~ ~
whereby more easi]y to be driven in~o the insulation blanket.
A preferred embodiment of the invention will now be described with respect to the appended drawing wherein:
Figure 1 i5 a perspective view of a attachment means made according to the invention;
Figure 2 is a cross-sectional view through part of a roofing installation wherein an attachment means according to ~ -the invention is used, the insulation blanket being uncompressed; ~
Figure 3 is a view similar to that of Figure 2 but ~;
showing the roofing installation being walked on.
The attachrnent means comprîses a generally flat washer-like thin disk 1 having a tubular depression member 2 integrally dependiny from one surface of the disk 1 and being in the form of an elongated well 2 of which the length is approximately half the thickness of the blan]cet 5. This well has a bore in com-munication with a hole at the center of the disk 1 and has a bottom wall 4 provided with a through passage of a diameter smaller than that of the bore. Also, the outer surface of the bottom wall 4 is preferably tapered and has a sharp end edge.

~ ~ .
- A screw 3 completes the attachment means. It has a stem of which the length is sufficient to be driven through the remaining of the blanket 5, securely held onto the base 6 and, in uncompressed condition of the blanket 5, has its head generally standing at the bottom of the well 2. This screw is :~ :
unrestrainedly received into the well to allow free relative movement between it and the well 2. In use, the insulation blanket 5 and the attachment means will be covered by a roofing felt 7 or the like covering.
With the above construction, it will be easily gathered as is clearly illustrated in Figure 3 that when someone walks on the roof and steps over an attachment means, the disk 1 - and well 2 will easily yield into t~é blanket 5 without any .

~-~ ~ 2 -'' ....

~48~3 danger of the head of the screw 3 protrudin~ fxom the well 2 to damage the felt 7.
The attachment means, more particularly the disk 1 and well 2 may be made of any suitable material such as plastics material and it is highly durable, elastic and cheaply manu-factured.
It is obvious to one skilled in the art that various :
embodiments of the invention may be achieved within the scope of the claims appended.

: ~ 3 _

Claims

The embodiments of the invention in which an exclusive property or privilege is claimed are defined as follows:

1. Attachment means for securing a resilient thermal insulation blanket of a predetermined thickness onto a base to form a surface to be walked on, said attachment means comprising:
- a washer-like generally flat and thin disk to be applied over said blanket and having a central hole;
- a tubular depression member integrally depending from one surface of said disk, said member having the form of an elongated well of which the length is approximately half the thickness of said blanket; wherein said well has a bore in communication with said disk central hole and a bottom wall having a through passage of a diameter smaller than that of said bore, and - a screw having a threaded stem and a head and being unrestrainedly mountable in said well, said stem having a size to freely extend through said bottom wall passage and a length to reach and securely fix said screw onto said base with said head then standing at said bottom wall in said well, in uncompressed condition of said blanket, said head being larger than the diameter of said passage and smaller than that of said bore.

2. Attachment means according to claim 1, wherein said bottom wall is outwardly tapered and has a sharp end edge.