Improvements relating to Sacklifters.
Year: 1889

page_text: Date of Application, 23rd July, 1889-Accepted, 31st Aug.,
1889
COMPLETE SPECIFICATION.
Improvements relating to Sacklifters.
I, TOM WARD COOK, of the West End Iron Works, Yaxley Peterborough,
Northamptonshire, Engineer, Millwright and Implement Agent do hereby declare the
nature of this invention and in what manner the same is to be performed, to be
particularly described and ascertained in and by the following statement :-
This invention has for its object improvements in sack-lifters and relates to improved
mechanism for actuating the moveable inner iron frame which usually obtains in
sack-lifters, and for controlling the movement of such frame.
This improved sack-lifter consists of an outer wood frame, upon which the wheels
are mounted, and the inner frame aforesaid.
And in order that my invention may be thoroughly understood I have appended the
accompanying drawings. Figure 1 is a side elevation of my improved sack-lifter.
Figure 2 is a front elevation of the same. Figure 3 is a section of Figure 1 taken
along the line A. B. Figures 4 and 5 are respectively an elevation and section on
an enlarged scale of mechanism hereinafter particularly described. Figure 6 is a
sectional plan on an enlarged scale of part of the outer wood frame showing an
arrangement for cushioning or breaking the fall of the inner frame.
Similar letters of reference indicate corresponding parts.
a
Within the wood frame A and forming part of the inner frame B is a rack O
which engages with a pinion D, hereinafter called the clutch pinion; the clutch
pinion D is mounted loosely on shaft E provided with bearings in the wood
frame A, and is prevented from lateral movement thereon by means of a shoulder a.
The shaft is hollow at the end opposite to the shoulder a, which end is closed by a
cap-nut F. Within this shaft and through the cap nut F works a spindle G on one
end of which is an adjustable nut H. Over the hollow shaft E works a clutch or
slide 1 having clutch surfaces corresponding to those formed on the clutch pinion D.
The said clutch I is connected to the spindle G by means of a key or pin J passing
through hollow shaft E, which key works in a slot in the hollow shaft. The end c
of the spindle G forms part of a universal joint and engages with a lever K pivotted to
an arm d screwed into the frame A; K being provided with an adjustable projection e.
A spiral spring L serves to keep the clutch surfaces aforesaid in contact.
By the above described mechanism the clutch pinion D is locked to its shaft E and
released therefrom as required.
The outer wood frame is cut away, as in Figs. 1 and 2, sufficiently to allow of the
projection e coming in contact with the inner iron frame aforesaid.
The clutch pinion shaft E is driven from a lower shaft M by means of a
combined handle and ratchet wheel N (with ratchet f) and connecting gear 0, 0¹.
The mode of using the sacklifter is as follows:-
The filled sack is placed on the inner frame and, the handle aforesaid being turned
is raised to the required height owing to the clutch surfaces of the slide engaging
with those of the clutch pinion through the tension of the spiral spring. When
raised to the required height the inner frame is kept in that position owing to the
When the sack
ratchet preventing the backward movement of the inner frame.
has been removed the clutch pinion is unlocked from its shaft by pressing inwards the
lever which causes the projection e to come against the moveable iron frame, thereby
disengaging the clutch surfaces of the clutch pinion and slide and allowing the inner
iron frame to travel downwards by its own weight. The moment the clutche surfaces
are released frame at once goes down and by pressing the lover the lever to the brake e
acts on moveable frame all the time it is going down and thereby steadies same, the
brake e being rendered adjustable as already mentioned. Where needed I employ as
a precaution against careless use of the before mentioned brake arrangement a device

page_text: (Figure 6) for breaking, cushioning or minimising the sudden shock caused by the
fall of the inner frame, upon the lower portion of the wood one. This is placed in
any suitable part, say of the lower portion of the wood frame A and consists of a
spring O" which is adjusted by means of a set screw..g.(engaging in a casting h) so as
to bite or bear against the inner frame. B on its descent.
As a means of strengthening the inner frame AI employ a cross piece P attached
thereto at its lower end.
I prefer to employ a guard Q, shown in Figure 2, which may be of any suitable
shape, for protecting the clutch pinion. I prefer in some cases to so arrange the
sack lifter that the lower part of the frame is level with the ground instead of being
inclined thereto, as in the accompanying drawings...
11_>
...
By this improved sack-lifter I dispense with, chains etc., as hitherto_used .and.also
obtain the advantage of having the device for throwing the actuating mechanism into
and out of gear enclosed in a tube.
B
Having now particularly described and ascertained the nature of my said Inven-
tion and in what manner the same is to be performed I declare that what 1
claim is :-
First In sack-lifters as above described, the combination of the rack C and the
clutch pinion D, mounted on the hollow shaft E which is closed at one end by. the
cap-nut F and which contains the spindle G connected to the clutch I and actuated
by the lever K connected thereto by the universal joint arrangement together with
the combined ratchet wheel and handle N.and connecting gear 0, 0¹ substantially as
described herein and illustrated by the accompanying drawings.
Second-In sack-lifters, as above described, the cushioning arrangement. for
breaking the downfall of the inner moveable frame (shown in Figure 6) together with
the strengthening cross-piece P.
Third: The improved sack-lifter substantially as described herein and illustrated
by the accompanying drawings
Dated this 22nd day of July 1889..
1.0
JAMES STEVENSON,
¡II
Gray's Inn Chambers, 2., High Holborn, London, W.C., Agent for Applicant.