SPECIFICATION
[0001] The object of the present invention is a row-limiter to be used in the storage of
trolleys and the like of a type provided with safety locks operable by inserting a
coin which remains on board thereof.
[0002] It is known that trolleys used by clients of shops or shopping centres require the
provision of storage lanes (usually disposed within parking areas) where the clients
of the shopping centres can return the trolley, get back the coin used to pull it
out and let the same trolley at the disposal of further clients.
[0003] In a known solution, the chains carrying the locks's keys are fixed to the same trolleys,
and the coin aboard one trolley can be collected only by placing another trolley nested
into the first one and fixing the key into the corresponding lock.
[0004] It is thus likely that rows of trolleys be formed close to one another in such a
way that they are in the way of persons or cars.
[0005] To avoid this problem, it has long been known the use of bars (row-limiter bars)
disposed at the sides of storage lanes, said bars being provided with chains to which
the trolleys must be fixed to recover the coin inserted into the lock.
[0006] Also this solution however exhibits the drawback that a disorderly storage (for example,
in which a trolley is fixed to the chain externally of the bar) would prevent the
full exploitation of the storage sites, thereby leaving a number of trolleys with
no constraint.
[0007] To overcome such a drawback, row-limiter bars are known provided with an internal
device for the return of chains coming out of the bar, said device preventing the
use of a chain until the previous one closest to the leading side of the storage lane
is used.
[0008] A known solution of this type of limiter bar is disclosed in the patent application
No.
FI2005A000050 in the name of the same applicant, the object of this patent being a row-limiter
device comprising a box-shape bar having therein a plurality of pulleys operatively
connected by levers for causing one pulley to shift from a locking position to a release
position with respect to the next one.
[0009] This solution has proved to be effective for eliminating the above described problems
of the prior art.
[0010] However, the applicants have found some drawbacks as to the reliability of the device
in case of a forced use thereof by the users, such as when, for example, the chains
should be taken out with excessive force or rapidity thereby tending to become locked
during the withdrawal.
[0011] A first object of the present invention is therefore to propose an improved apparatus
for reliable operation under any operating condition.
[0012] The proposed objects are achieved by an apparatus according to the attached claims.
[0013] The technical characteristics of the invention, according to the above objects and
the advantages thereof will be better understood by a reading of the detailed description
that follows in conjunction with the accompanying drawings which illustrate an exemplary
and not limiting embodiment of the same invention. In the drawings:
- Fig. 1 shows a first embodiment of the invention in side view with some parts being
taken away for the sake of exposition;
- Fig. 1a is a sectional front view of the invention of Fig. 1;
- Fig. 2 is a sectional front view of a structural shape for housing the apparatus shown
in Fig. 1;
- Fig. 3 shows in detail a chain-carrying pulley of the invention with relevant means
for fastening it to the structural shape;
- Fig. 3a is a top view of the fastening means shown in Fig. 3;
- Figs. 4a, 4b, 4c are respectively a plan view, a side view and a sectional view of
the pulley shown in Fig. 3;
- Figs. 5a and 5b are respectively a front view and a top view of a lever for connecting
successive chain-carrying pulleys of the invention; and
- Fig. 6 shows in detail a chain guide according to the invention.
[0014] Described herebelow with reference to the accompanying figures is a preferred embodiment
of the invention, comprising a bar 1 of longitudinal development wherein a plurality
of pulleys 2 can be inserted in succession. The pulleys are preferably carried by
a T-shape support 3 consisting of a cylindrical journal 4 for the rotation of the
pulley, and flat base 5 able to be close-fit inside a longitudinal profile 6 for sliding
therein (as best seen in section in Fig. 2) and be fixed in place by means of pressure
screws 7.
[0015] Preferably, the bar 1 is provided with ribs 31 for longitudinally stiffening the
structure during the operation of the pulleys 2.
[0016] Illustrated in greater detail with reference in particular to Figs. 4a-4c is a pulley
2 according to the invention.
[0017] The pulley 2 is made up of a cylindrical body with a central T-shape hole 10 for
receiving the rotary journal 4, and comprises a slotted section 9 around which it
is possible to wind up a chain 16, the latter being possibly fixed by one end 17 thereof
to a stationary point 15 of the pulley and exiting from the bar 1 with its free end
(carrying the key 26) through holes 25 formed to shape in correspondence of the various
pulleys 2.
[0018] Formed on a face of the slotted section 9 is a relief having a cam-like surface 8
comprising a circular length T2 having radius R2 coaxial to the axis A of the pulley,
and a length T1 lying at reduced radial distance from axis A, preferably of circular
shape with radius R1.
[0019] Also provided on the slotted section 9, abutting on the cam 8, is a stop means 14
consisting, for example, of a screw pivot.
[0020] Illustrated with reference to Figs. 5a and 5b in particular, is a locking element
18 according to the present invention.
[0021] The element 18 is made up of a lever having a central fulcrum 19 and pivoting about
a journal 20 against the action of a return spring 21.
[0022] In case of rapidly handling the chain 16, the levers 19 oscillate fast and tend therefore
to deviate laterally from the point of contact with the cam 8.
[0023] Advantageously, the present invention provides for disposing lateral retaining flanges
29 on the pulleys 2, in close proximity of cam 8, which are able to maintain the lever
19 in place also under conditions of high stress.
[0024] In particular, the flange 29, by being disposed in contact with, or anyway in close
proximity of cam 8, but exhibiting greater radial dimensions, defines a seat 30 so
dimensioned as to allow the lever 19 to be housed therein for a free movement thereof
without interference.
[0025] Preferably, the journal 20 makes part of a T-shape support 22 comprising a flat base
23 that can be slidably inserted with precision along the restrained joint profile
6 of bar 1, and fixed in place by means of pressure screws 24.
[0026] Advantageously, by having adopted a mechanism-carrying guide of a type adjustable
by clamping, it is possible to adopt any type of trolley with any distance between
the site of placements.
[0027] By referring again in particular to Fig. 1, the assembling of the apparatus requires
the insertion in sequence along the restrained joint 6 of a first T-shape support
5 for one pulley, a T-shape support 22 for a lever 19, and then a second pulley support
5 being spaced by a predetermined extent from the first one.
[0028] The succession of supports 5 and 22, which are fixed in place by corresponding pressure
screws 7 and 24, is then repeated until the bar is completed with a desired number
of trolley placements, a corresponding number of holes 25 being formed on the bar
1 (usually spaced by 22 to 26 cm from each other) to allow the end 16 of chains carrying
the keys 26 to pass outside therethrough.
[0029] Advantageously, in one embodiment of the present invention, the holes 25 have a chain-guide
30 of extended shape formed inside the bar 1.
[0030] Preferably, the inner section of the chain-guide 30 is cylindrical or slightly conical
and extends over a length approximately equal to a ring of the chain 16 to facilitate
a linear sliding of the same chain upon quick displacements.
[0031] Once the pivots are fixed in place, the pulleys can be mounted on the pivots 4, along
with respective springs 11, and the levers 19 can be mounted on pivots 20, also with
respective springs 21, to result disposed at an inclination and in contact with the
cams 8 of two adjacent pulleys.
[0032] In greater detail, and with reference to the configuration of the bar illustrated
in Figs. 1 and 5a, each lever 19 results into abutment, with a first end 27 thereof,
onto the upper part of cam 8 of the pulley being on its right side, and by the second
end 28 thereof onto the lower part of cam 8 of the pulley on its left side.
[0033] Moreover, the lever is housed laterally, between the pulley 2 and the flange 29,
within the seat 30.
[0034] Preferably, the end 28 of lever 19 exhibits a circular profile conjugated to the
radius R2 of the length T2 of cam 8.
[0035] Upon operation of the apparatus, the chains 16 are all initially wound onto the pulleys
2 in the configuration of pulley P1 shown in Fig. 1, hereinafter to be referred to,
for the sake of clarity, as "external" pulley, that is, inserted into the bar 1 following
an "internal" pulley P3 and an "intermediate" pulley P2 being there between in the
direction of insertion of the trolleys into the corresponding storage sites.
[0036] In this configuration, the chain 16 is wound onto the pulley P1 and the locking lever
19 is in contact, on one side, with the length T1 of the cam 8 of the adjacent pulley
P2 immediately internal thereto (the latter being in wound chain asset as well), and
on the other side, with a portion of the cam 8 of the pulley P1 close to the striker
or stop means 14.
[0037] In this position of the lever 19 (locking position), should the chain 16 of pulley
P1 be withdrawn, the pulley would tend to rotate in clockwise direction (arrow of
Fig. 1) thereby moving the stop means 14 into abutment against the end 28 of lever
19 and preventing the chain from being taken out any further.
[0038] With reference to Fig. 1, the internal pulley P3 can be seen rotated in anticlockwise
direction, with the chain 16 already taken out, and the end 27 of the lever 19 in
contact with the length T2 of cam 8.
[0039] In this position (unlocking position), the lever 19 has been rotated in anticlockwise
direction with respect to the locking position (dashed line) and its end 28 has moved
away radially with respect to the stop means 14 of the pulley P2 which is now free
to rotate.
[0040] Consequently, it is possible to withdraw the chain 16 from the pulley P2 located
immediately outside thereof so as to allow the cam 8 to shift the respective lever
19 to the unlocking position and to release therefore the pulley located immediately
outside thereof, and so on, until the row is completed.
[0041] Advantageously, the geometry of cam 8 is such that once the lever 19 comes in contact
with the length T2 thereof, the position of the same lever remains unchanged thus
making it possible a withdrawal of the chain over an extent greater than in any other
known solution.
[0042] An apparatus according to the present invention achieves major advantages.
[0043] A first advantage lies in the fact that, by utilizing the retaining flange 29, any
lateral deviation or deformation of the levers 19 is prevented in case the latter
are stressed in use by heavy loads and high speeds.
[0044] A second advantage of the apparatus according to the present invention lies in the
fact that, by utilizing chain-guides 30 of extended shape, there is ensured a correct
sliding of the chain 16 through the holes 25 also in the presence of high speeds thereof.
[0045] The invention conceived as above described is obviously suited for industrial applications;
it will be appreciated that the same invention may also be subjected to many modifications
and changes without departing from the scope of the inventive idea; moreover, all
its parts may be replaced by technically equivalent elements.
1. Row-limiter device for the orderly storage of a plurality of trolleys provided with
safety lock, comprising:
- an extended box-shaped bar (1) horizontally disposed at a predetermined level corresponding
to the height of the trolleys locks;
- at least two pulleys (2) rotatively received within the bar and having axes of rotation
(A) spaced apart by a predetermined extent along the longitudinal axis of the bar;
- at least two chains (16) provided at one external free end thereof with a key (26)
for engagement with said locks, each chain (16) being wound without slipping around
a corresponding pulley (2) to be able to shift reversibly from an extracted position
to a position for the most part internal to said bar (1);
- at least a locking element (19) disposed inside said bar (1) in a position intermediate
between two successive pulleys (2) and comprising an oscillating lever with central
pivot, the two ends (27, 28) of said lever interfering with two corresponding strikers
provided on each pulley (2) and whose rotation is cause for the oscillation of the
lever (19) between the locking and unlocking positions of the other pulley, said device
being characterized in that it further comprises a side flange (29) which is applied to said pulley (2) and makes
up a seat (30) for laterally housing said lever (19) during operation.
2. Device according to claim 1 wherein said flange (29) is removable with respect to
said pulley (2).
3. Device according to any of the preceding claims, wherein said cam (8) exhibits a length
(T2) of circular surface concentric with respect to the axis (A) and corresponding
to the abutment of the lever in unlocking position.
4. Device according to any of the preceding claims, wherein said pulleys (2) are borne
by a first T-shape support (3) sliding within a corresponding inner profile (6) of
restrained joint of the bar (1) to adjust the longitudinal position of the pulleys
(2) at will.
5. Device according to any of the preceding claims, wherein said lever (19) is borne
by a second T-shape support (23) sliding with precision within a corresponding inner
profile (6) of restrained joint of the bar (1) to adjust the longitudinal position
of the lever (19) at will.
6. Device according to any of the preceding claims, wherein said bar (1) further comprises
one or more longitudinal stiffening ribs (31).
7. Device according to any of the preceding claims, wherein said pulleys (2) and/or said
lever (19) are able to rotate on respective supports against the action of a return
spring (11, 21).
8. Device according to any of the preceding claims, wherein said bar (1) further comprises
a plurality of holes (25) disposed in proximity of said pulleys (2) to allow respective
chains (16) to pass therethrough.
9. Device according to claim 8 wherein said holes (25) are provided with respective chain
(16)-guides of extended cylindrical shape.