Structure for positioning an expandable rod of a tree pruner

Details Structure for positioning an expandable rod of a tree pruner Structure for positioning an expandable rod of a tree pruner

2002-01-08

2003-09-16

Browne, Lynne H. (Department: 3679)

Joints and connections

Interfitted members

Rotary binding cam or wedge

C403S109500, C403S350000, C403S352000, C016S429000, C030S340000

Reexamination Certificate

active

06619877

ABSTRACT:

BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates generally to a tree pruner, and more particularly to a positioning or locating structure of an expandable rod of the tree pruner.
2. Description of Related Art
The tree pruner is generally provided with an expandable rod to facilitate the removing of dead or living parts of a tall plant.
As shown in
FIGS. 1-4
, an expandable rod of the prior art is formed of an inner tube
50
and an outer tube
60
. The inner tube
50
is slidably fitted into the outer tube
60
, thereby enabling the expandable rod of the prior art to be adjusted in length. The inner tube
50
is provided at one end with a drive block
51
, which is located by a stop block
52
. The stop block
52
is provided with a through slot
53
, an Inner slot
54
opposite in location to the through slot
53
, and two eccentric arcuate recesses
55
. The eccentric arcuate recesses
55
are provided with a stop projection
56
. The stop block
52
is provided in the outer wall with two reverse ratchet portions
57
. The stop block
52
is rotatably joined with the drive block
51
of the inner tube
50
. In light of the contact surface between the drive block
51
and the eccentric arcuate recess
55
of the stop block
52
being smooth, the drive block
51
is apt to slide at the time when the outer tube
60
is twisted slightly. As a result, the inner tube
50
and the outer tube
60
can not be securely located. The work efficiency of the tree pruner is thus adversely affected. In addition, the stop projections
56
are vulnerable to damage which is caused by the impact of the drive block
51
, as illustrated in FIG.
3
.
BRIEF SUMMARY OF THE INVENTION
The primary objective of the present invention is to provide a structure for locating securely an expandable rod of the tree pruner.
The locating structure of the present invention comprises an outer tube, an inner tube provided at one end with a drive block, and a stop block which is fitted over the drive block such that the stop block serves to locate securely the outer tube and the inner tube.


REFERENCES:
patent: 5011319 (1991-04-01), Levi et al.
patent: 5460458 (1995-10-01), Caceres
patent: 5692856 (1997-12-01), Newman, Jr. et al.
patent: 2002/0096204 (2002-07-01), Lin

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