U.S. patent number 3,698,144 [Application Number 05/094,935] was granted by the patent office on 1972-10-17 for post anchor.
Invention is credited to Patrick Joseph Stratton.
United States Patent |
3,698,144 |
Stratton |
October 17, 1972 |
POST ANCHOR
Abstract
A detachable post anchor for use with highway marker posts and
the like is provided. The anchor comprises two separable elements,
more particularly a spike member and a holder. The spike member
includes a spike, a horizontal base plate carried by the spike at
its upper end, and a slotted lug extending upwardly from the base
plate. The holder is tubelike in form and receives the bottom end
of the post in its upper end. A pair of spaced, vertical, slotted
lugs are fixed within the bottom end of the holder. The slots of
the spike and holder lugs line up when the holder is mounted on the
base plate. A shear pin is inserted through the lugs to secure the
holder and spike together. When the post is struck from the side,
the holder pivots about its bottom edge; the shear pin parts and
the post and holder topple over. The anchor can be re-assembled by
insertion of a new shear pin.
Inventors: |
Stratton; Patrick Joseph
(Whitecourt, Alberta, CA) |
Family
ID: |
22248024 |
Appl.
No.: |
05/094,935 |
Filed: |
December 3, 1970 |
Related U.S. Patent Documents
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Application
Number |
Filing Date |
Patent Number |
Issue Date |
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863010 |
Sep 24, 1969 |
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Current U.S.
Class: |
52/99; 52/157;
404/10; 403/2 |
Current CPC
Class: |
E04H
12/2223 (20130101); E01F 9/638 (20160201); Y10T
403/11 (20150115) |
Current International
Class: |
E01F
9/018 (20060101); E01F 9/011 (20060101); E04H
12/22 (20060101); E01f 009/01 (); E04c
003/32 () |
Field of
Search: |
;94/1.5
;52/155,157,98-100 ;287/103,119 |
References Cited
[Referenced By]
U.S. Patent Documents
Foreign Patent Documents
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375,038 |
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Mar 1964 |
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CH |
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846,441 |
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Aug 1960 |
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GB |
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Primary Examiner: Sutherland; Henry C.
Parent Case Text
CROSS-REFERENCE TO RELATED APPLICATION
This application is a continuation-in-part of my application for
U.S. Letters patent Ser. No. 863,010, filed Sept. 24, 1969, now
abandoned.
Claims
What is claimed is:
1. In combination:
a tubelike holder having an opening in its side wall;
said holder being adapted to receive and retain the lower end of a
post in the upper end thereof;
means traversing said holder inwardly of the lower end thereof;
an anchor member having a spike, for insertion in the ground, and a
base plate carried by the spike at its upper end, said base plate
having an upwardly turned peripheral flange;
a pair of spaced, vertical lugs fixed to the traversing means and
being disposed within the lower end of the holder, each such lug
having a longitudinal slot formed therein;
a rigid lug, having a longitudinal slot extending therethrough,
said rigid lug extending upwardly from the base plate between the
said pair of holder lugs;
the lug slots and holder opening being aligned;
a shear member extending through the lug slots and releasably
connecting together the holder and anchor member;
said pair of holder lugs being spaced apart sufficiently whereby
the said lugs may be displaced from the operative position without
jamming when the holder is pivoted about its bottom edge.
Description
BACKGROUND OF THE INVENTION
This invention relates to a post anchor.
It is known to provide a highway marker post or the like with a
post anchor which can be easily planted and which permits the post
to pivot free when struck from the side, The anchor includes a
spike which is driven into the ground up to a horizontal plate
carried at the spike's upper end. The bottom end of the post is
fixed in a tubelike holder and the holder is detachably secured to
the base plate and spike by a joint mechanism. Two typical examples
of this prior art are shown in U.S. Pat. No. 3,451,319, issued to
Gubela, and Swiss Pat. No. 375,038, issued to Beilharz.
Highway posts are often knocked down by graders and other vehicles.
There are advantages to be gained by equipping these posts with
detachable post anchors. For example, the spike can be installed
without digging a hole, which is a relatively costly operation. In
addition, the post remains undamaged when struck down and can be
re-used. Finally, the post can be easily taken down when desired;
this is desirable, for example, when a grader operator wishes to
clear a posted section of a road or when the posts are to be
re-painted.
The prior art anchors of this type are characterized by certain
structural features which affect their performance in cold weather
areas. More particularly, some anchors have joint parts which are
buried beneath the ground surface. When the ground is frozen these
parts are virtually inaccessible and cannot be replaced. Other
anchors have joint parts which tend to become very difficult to
release when surrounded with ice and snow.
SUMMARY OF THE INVENTION
It is an object of this invention to provide a post anchor whose
joint parts are located above the base plate and within the bottom
end of the tubelike holder. As a result of this arrangement, the
parts would be accessible at all times and unaffected by
surrounding snow or ice.
It is another object to provide a post anchor which is equipped
with a releasable joint assembly which has one or more parts
adapted to yield to allow the holder to separate from the anchor
member when the holder is pivoted about its bottom edge.
It is another object to provide a post anchor whose releasable
joint assembly includes an easily-replacable shear pin as the
locking element of the joint.
In accordance with the invention, a rigid part, such as a slotted
lug, extends upwardly from the anchor base plate. This part
comprises part of the separable joint assembly. Securing means are
provided within the lower end of the tubelike post holder to
cooperate with the lug to complete the joint assembly. The securing
means may comprise a pair of spaced, vertical, slotted lugs, fixed
within the holder, and a shear pin. The holder and anchor lugs are
arranged so that their slots are aligned when the holder is erected
on the base plate in the operative position. The shear pin is
inserted through an opening in the holder side wall to extend
through the slots and thereby connect the holder and anchor member
together. When a side thrust is applied to the post, the holder
pivots about the up-turned peripheral flange of the base plate and
parts the shear pin, thereby releasing the holder from the anchor
member.
My assembly has several desirable features. The yielding parts are
located above the base plate where they are accessible for
replacement. Additionally, the joint parts are substantially
enclosed within the holder in the assembled or operative position;
as a result, they are protected from ice and the like. Finally, by
spacing the holder lugs sufficiently apart so that they don't jam
against the spike lug when releasing, a joint is provided which
separates when the post is struck from any side.
BRIEF DESCRIPTION OF THE DRAWING
In the drawings:
FIG. 1 is a sectional side view of one embodiment of the
invention.
FIG. 2 is an exploded perspective view of the embodiment shown in
FIG. 1.
FIG. 3 is a perspective view of another embodiment of the anchor
section.
FIG. 4 is an exploded perspective view of another embodiment of the
invention.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Definitions
Anchor member or spike -- These words are intended to mean any
point which is elongate and easily pierces the ground. Usually this
will involve a solid steel spike having a sharpened end, as shown
in FIG. 1. However, equivalents, such as the twisted spike shown in
FIG. 3 or a length of steel tubing, are considered within the scope
of these words.
Holder -- Is intended to include both the tubelike element and the
means for securing the element and post together. The securing
means may be a taper in the holder side wall or nails driven
through the wall into the post.
Tubelike -- Is intended to include holders of round or other cross
section, such as rectangular.
With reference to FIG. 1, the anchor comprises a holder section 1
and an anchor section 2.
The anchor section 2 includes a pointed steel spike 3. A head 4 is
connected to the spike 3 at its upper end by a neck 4a of reduced
cross section. A rectangular base plate 5 is carried by spike 3
just below neck 4a. As shown, base plate 5 is arranged transversely
to the axis of spike 3. The edge of base plate 5 is up-turned to
provide a peripheral flange 6. Plate 5 and flange 6 are adapted to
snugly receive the bottom end of the holder 7.
The holder section 1 comprises a holder 7 and spring elements 8. As
shown, holder 7 is rectangular in section and tubelike in form. A
plate 9 traverses the interior of the holder 7 inwardly of its
lower end and thereby divides it into upper and lower cavities 10,
11. The bottom end of post 12 is received in cavity 10 and is
retained therein by nails 13.
The four spring elements 8 are secured to the bottom surface of
plate 9. These elements 8 form a downwardly opening, expandable
spring socket arrangement which can be forced over head 4. The head
4 and spring elements 8 combine to form a releasable joint which,
in the assembled state, secures the holder and anchor sections
together.
To assemble and use the anchor, the spike 3 is first driven into
the ground. The base plate 5 bears against the ground surface and
acts as a stop. The holder 7, usually already attached to the post
12, is biased downwardly to force the spring elements 8 over head 4
and thereby secure the holder and anchor sections together in the
operative position.
When the post 12 is struck with substantial force from the side,
the holder 7 pivots about its bottom edge and the adjacent base
plate flange 6. The spring elements 8 release head 4 as pivoting
continues and the post and holder section fall free.
Turning now to the alternative embodiment shown in FIG. 4, a spike
30 having a helical thread 31 is shown. In this case, the
releasable joint assembly includes a rigid lug 32 extending
upwardly from spike 30. The lug 32 defines a longitudinal slot 33
extending therethrough. A pair of spaced, vertical lugs 35 are
disposed within the lower end of holder 37; as shown, they are
fixed to the traversing plate 34. Each lug 35 defines a
longitudinal slot 36 extending therethrough. When the holder 37 is
mounted on the spike base plate, the lug 32 extends into the bottom
end of the holder and between the two holder lugs 35. The lug slots
33, 36 are aligned so that a shear member 40, inserted through the
opening 39 in holder side wall 38, will extend through them. Shear
member 40 functions to releasably connect the holder 37 and anchor
member together.
When the post 12 is struck from the side, the holder 37 pivots
about its bottom edge causing the shear pin 40 to part. The holder
lugs 35 are spaced apart sufficiently to allow them to pass over
lug 32 without jamming when pivoting is occurring. As a result, the
post and holder fall free. The device is re-erected by reassembling
the parts and inserting a new shear pin.
From the foregoing it will be appreciated that the joint assembly
parts are disposed above the base plate so that they are readily
accessible. In addition, they are sheltered so as to be relatively
free of icing problems.
While the invention has been described with a certain degree of
particularity, it is understood that the disclosure has been made
only by way of example and that changes in the details of
construction and the combination and arrangement of parts may be
resorted to without departing from the spirit and scope of the
invention as hereinafter claimed.
* * * * *