JP4518274B2 - Belt adjustment mechanism and belt hoist and belt loader equipped with this belt adjustment mechanism - Google Patents

Description

  The present invention relates to a belt adjustment mechanism applied to a belt hoist, a belt loader, and the like, and more particularly, to a belt adjustment mechanism that can reliably and safely adjust the length of a belt tension portion when a load is applied. Belt hoists can also be used in fields such as nursing care.

In general, belt hoists and belt loaders need to be able to drive the adjustment-side belt for lifting and tightening various work objects such as luggage and construction products securely and safely in the tensioned state. The present invention meets such a demand.
The operation itself of the adjustment mechanism of the adjustment side belt tension portion is the same for both the belt loader and the belt hoist.

FIG. 24 shows an example of a belt adjustment mechanism (see the patent document described later) proposed by the applicant of the present application.
Here, a driving base 103 on which the driving roller 102 of the adjustment side belt 101 is mounted and a pressing base (tension) on which a pinch roller 104 for pressing the adjustment side belt 101 against the driving roller 102 and maintaining a predetermined balance state is mounted. For example, a base 105 is provided.

  The driving base 103 and the pressing base 105 are relatively slidable, and the sliding direction is set to coincide with the linear direction connecting the driving roller 102 and the pinch roller 104.

  The belt adjusting mechanism shown in FIG. 24 is configured such that the pinch roller base (pressing base 105) and the driving roller base (driving base 103) move while sliding relative to each other. This solves the problem that has occurred in the belt adjustment mechanism of the type in which the base rotates with respect to the drive roller base.

What is this problem?
(11) When the adjustment side belt that is pressed and held in balance with the load F is sent out by the drive roller in the direction of closing the load, the pinch roller strongly presses the adjustment side belt against the drive roller. The roller will shift to the bite state, and it will no longer be possible to rotate the drive roller and send it out in the packing direction.
(12) Contrary to this, if the adjustment side belt slips even slightly from the drive roller in the loose direction in a certain balance state, the holding state of the adjustment side belt by the pinch roller is released at a stretch, and it is fixed with the belt until then. Luggage that has been destroyed suddenly collapses,
Etc.
International Publication No. 2004/081409 Pamphlet

  In the case of the belt adjustment mechanism shown in FIG. 24, the adjustment belt is pressed against the drive roller exclusively by the action of the pressing roller, so there is room for further improvement in terms of stabilizing the frictional force between the adjustment side belt and the drive roller. have.

  In the present invention, the adjustment-side belt that fixes and holds the work object is pressed against the wide range in the circumferential direction of the drive roller with the presser belt, and thereby the frictional force between the adjustment-side belt and the drive roller is reduced. The purpose is to stabilize and make uniform.

  In addition, when the presser belt is broken, the adjustment side belt is pressed against the drive roller with a pinch roller, thereby preventing the adjustment side belt from falling off when the presser belt is broken, and making the belt adjustment mechanism safe. With the goal.

The present invention solves the above problems as follows.
(1) In a belt adjustment mechanism that can adjust the length of a tension portion of a belt based on a predetermined driving operation,
A driving roller for the belt (for example, driving rollers 11, 31, 31 ′ described later);
A driving base (for example, driving bases 16, 36 described later) on which the driving roller is mounted;
A presser belt (for example, presser belts 14 and 34 described later) for pressing the belt against the peripheral surface of the drive roller;
Guide rollers for setting the path of the presser belt (for example, guide rollers 18a, 18b, 37g, 38b described later, press rollers 18b ', 18c, 38c, 38e, 38e', 38f, 38g);
A tension base (for example, a tension base 17 to be described later) on which a tension roller (for example, tension rollers 17b, 37b, 37b ', 37h, and a guide roller 37g to be described later) is mounted;
The driving base and the tensioning base are provided in such a manner that they are relatively moved in a direction of increasing the tension of the presser belt based on a load (for example, a load F described later) applied to the belt.
(2) In (1) above,
When the presser belt breaks in the state of receiving the load, a pinch roller (for example, pinch rollers 53 and 63 described later) for pressing the belt against the peripheral surface of the driving roller based on the load on the tension base. ).
(3) In (2) above,
As a member for mounting the pinch roller, it is movable with respect to the drive base, and when the presser belt is broken, the drive base and the tension base are brought into contact with the shaft of the tension roller. Breakage prevention bases (for example, maintenance bases 54 and 64, connection arms 56, which will be described later) having tension roller holes (for example, maintenance holes 56a, 66a, which will be described later). 66).
(4) In the above (2) and (3),
As a member that regulates the separation state between the pinch roller and the drive roller peripheral surface, the pinch roller can be moved with respect to the drive base, and when the presser belt is operating normally, the pinch roller is pressed against the drive roller. A surface portion (for example, a cam surface 67b to be described later) is held in a state where the holding belt is separated and moved relative to the tension base when the presser belt is broken to release the holding state. ) Having a separation base (for example, a cam action member 67 described later).

  According to the present invention, the adjustment-side belt is sandwiched between the tensioning presser belt and the drive roller, and the contact area between the drive roller and the adjustment-side belt is large. In addition, the degree of wear of the adjustment side belt can be significantly reduced.

  In addition, when the tensioned presser belt breaks, the adjustment side belt is pressed against the drive roller by the pinch roller, so that the adjustment side belt is prevented from coming off due to the presser belt breakage. The safety of the belt adjustment mechanism can be achieved.

FIG. 1 is an explanatory view showing a manual belt adjusting mechanism. Example 1 FIG. 2 is an explanatory view showing a manual belt adjusting mechanism. (Example 2) FIG. 3 is an explanatory view showing a manual belt adjusting mechanism. (Example 3) FIG. 4 is an explanatory view showing a manual belt adjustment mechanism. Example 4 FIG. 5 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 5) FIG. 6 is an explanatory view showing a side state of the electric belt hoist shown in FIG. (Example 5) FIG. 7 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 6) FIG. 8 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 7) FIG. 9 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 8) FIG. 10 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). Example 9 FIG. 11 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 10) FIG. 12 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). (Example 11) FIG. 13 is an explanatory view showing an electric belt adjusting mechanism (belt hoist). Example 12 FIG. 14 is an explanatory view showing an initial setting state of the belt adjusting mechanism provided with a safety ensuring pinch roller when the presser belt is broken. (Example 13) FIG. 15 is an explanatory view showing a balance state and a presser belt breaking state of the belt adjusting mechanism of FIG. (Example 13) FIG. 16 is an explanatory diagram showing a main part in the initial setting state of FIG. (Example 13) FIG. 17 is an explanatory view showing a main part in the balance state and the presser belt broken state of FIG. (Example 13) FIG. 18 is an explanatory view showing a belt adjustment mechanism (belt hoist) provided with a pinch roller for ensuring safety when the presser belt is broken. (Example 14) FIG. 19 is an explanatory view showing a belt adjustment mechanism (belt hoist) provided with a pinch roller for ensuring safety when the presser belt is broken. (Example 15) FIG. 20 is an explanatory view showing a balance state of a belt adjustment mechanism (belt hoist) provided with a pinch roller for ensuring safety when the presser belt is broken. (Example 16) FIG. 21 is an explanatory view showing a state where the presser belt is broken in the belt adjusting mechanism of FIG. (Example 16) FIG. 22 is an explanatory view showing a main part in the balanced state of FIG. (Example 16) FIG. 23 is an explanatory view showing a main part in a state in which the presser belt is broken in FIG. (Example 16) FIG. 24 is an explanatory diagram showing the prior art.

Explanation of symbols

  The components represented by the following symbols with lowercase letters indicate that they are in principle part of the components of the first numeric part. For example, the elongated hole 16 a for sliding operation is a hole formed in the drive base 16.

[Manual belt adjustment mechanism of FIGS. 1 to 4]
11 A driving roller whose surface is knurled 11a A rotating shaft of the driving roller 12 A locking portion such as a hook or an eye (loop shape) is provided at the end, and the length of the tension range to the end is the driving roller 11 adjustment side belt adjusted by the action of 11 13 fixed side belt provided with locking portions such as hooks and eyes at the end 13 'fixed hook acting as locking means similar to the fixed side belt 14 on the surface of the driving roller Endless presser belt 15 for sandwiching the adjustment side belt 12 over a length of about 3/4 in the circumferential direction 15 Operation lever 16 of the drive roller 11 The drive roller 11 is mounted, the adjustment side belt 12, the fixed side belt 13 and the fixed hook When a load F is applied to 13 ', a pair of drive bases (back side) that move relative to a tension base 17 described later
16a to 16e Elongated hole portions for relative sliding operation in the left-right direction and the up-down direction shown in the drawing 16f A connecting shaft between a pair of driving bases 16 17 A tension roller 17b is mounted, and an adjustment side belt 12 and a fixed side belt 13. A pair of tension bases (back side) for increasing the tension of the presser belt 14 by moving relative to the drive base 16 when a load F is applied to the fixing hook 13 '.
17a Attaching shaft of the fixed side belt 13 17a 'A supporting shaft of the fixing hook 13' 17b A tension roller (also a guide roller) for the presser belt 14
18 When pressure rollers 18c and 18b ′, which will be described later, are mounted and a load F is applied to the adjustment side belt 12, the fixed side belt 13, and the fixing hook 13 ′, the adjustment side is moved relative to the drive base 16. A pair of pressing bases (back side) for pressing the belt 12 and the pressing belt 14 against the driving roller 11
18a, 18b Guide roller 18b ', 18c of pressing belt 14 Pressing roller (also guide roller) for adjusting side belt 12 and pressing belt 14
18 d Long hole portion for driving roller 19 19 The non-tensioned portion of the adjustment side belt sent out from the sandwiching area between driving roller 11 and pressing roller 18c in the direction of closing in accordance with the turning operation of operation lever 15 is the driving roller. Separator to prevent wrapping around

[Electric belt hoist of FIGS. 5 to 13]
31 (used in FIGS. 5, 6 and 9)
Driving roller 31 ′ whose surface is knurled (used in FIGS. 7, 8, 10, 11 to 13)
Driving roller 32 whose surface is formed in a gear shape in the circumferential direction and engages with an intermediate timing belt 41 described later 32 Moves up and down by the action of driving rollers 31 and 31 ′, and engages with hooks and eyes (loop-like portions). Adjustment side belt provided with a stop portion at the end 33 Fixing hook 34 Endless presser belt 35 for sandwiching the adjustment side belt over the circumferential length of approximately 3/4 or more of the surface of the drive roller 35 of the drive rollers 31, 31 ′ Electric brake motor 36 acting as a driver 36 A pair of drive bases (back side) mounted with drive rollers 31, 31 '
36a A support shaft (rotation center axis) for a tension base 37 to be described later
36b to 36d Elongated hole portion 36e for rotation of tension base 37 described later 36e Support shaft 36f for fixing hook 33 Guide roller 36g, 36h for adjusting side belt 32, presser belt 34, intermediate timing belt 41 described later, etc. Presser belt 34 The guide roller 36j is a timing roller (guide roller) that is urged downward in the figure by an elastic force such as a spring (not shown) and is synchronized with an intermediate timing belt 41 described later.
36k Elongated hole for moving the timing roller 36m A support shaft (rotation center axis) for a pressing base 38 to be described later
36n to 36r Slot holes 36s, 36t for rotation of a pressing base 38, which will be described later. Timing rollers (also serving as guide rollers) having substantially the same diameter as the driving roller 31 'and synchronized with the intermediate timing belt 41 described later.
36u The guide roller 37 (used in FIGS. 5 to 7 and FIGS. 9 to 13) has substantially the same diameter as the driving roller 31 ′ and the timing roller 36s, and is used for the pressure adjusting side belt 32, the presser belt 34, and an intermediate timing belt 41 described later )
A pair of tension bases (back side of the tension base) for increasing the tension of the presser belt 34 by the relative counterclockwise rotation with the drive base 36 when the load F is applied to the adjustment side belt 32. base)
37 ′ (used in FIG. 8)
A pair of tension bases (the back side bases) for strengthening the tension of the presser belt 34 by the relative clockwise rotation with the drive base 36 when the load F is applied to the adjustment side belt 32. )
37a Hole 37b (used in FIG. 5) held by the support shaft 36a of the drive base 36
Tension roller (also a guide roller) for the adjustment side belt 32 and the presser belt 34
37b ′ (used in FIGS. 7 and 8)
Tension roller (also a guide roller) for the adjustment side belt 32, the presser belt 34, and an intermediate timing belt 41 to be described later
37c (used in FIG. 5)
A guide roller for the adjustment side belt 32;
37c ′ (used in FIGS. 7 and 8)
Timing roller (guide roller) for the adjustment side belt 32 and an intermediate timing belt 41 described later
37d Guide shaft of the tension base 37 itself,
37e Support shaft for fixing hook 33 37g Guide roller for presser belt 34 (also tension roller)
37h Tension roller (also a guide roller) for the presser belt 34
38 (used in FIGS. 9 to 13)
When a load F is applied to the adjustment side belt 32, a pair of pressing bases (the back side bases) that rotate relative to the driving base 16 in the counterclockwise direction in the figure.
38a Hole portion held by the support shaft 36m of the drive base 36 38b Guide rollers (pressing rollers) such as the adjustment side belt 32, the presser belt 34 and the intermediate timing belt 41
38c A pressing roller (also a guide roller) for pressing the adjustment side belt 32, the pressing belt 34, an intermediate timing belt 41 described later, and the like against the driving rollers 31, 31 ′
38d guide shaft of the pressing base 38 itself,
38e (used in FIG. 11)
A pressing roller (also a guide roller) for pressing the adjustment side belt 32, the pressing belt 34 and the intermediate timing belt 41 against the driving roller 31 'and the timing roller 36s.
38e '(used in FIG. 12)
A pressing roller (also a guide roller) for pressing the adjustment side belt 32, the pressing belt 34, and the intermediate timing belt 41 against the driving roller 31 'and the timing roller 36t.
38f Pressing roller for pressing the adjustment side belt 32, the pressing belt 34, and the intermediate timing belt 41 against the timing roller 36s (also a guide roller for the pressing belt 34)
38g Pressing roller (also a guide roller) for pressing the adjustment side belt 32, the pressing belt 34 and the intermediate timing belt 41 against the timing rollers 36s and 36t
39 Separator for preventing adjustment side belt portion fed from driving roller 31 from being wound around driving roller during lifting operation of work object 40 Connecting output shaft side of motor 35 and input shaft side of driving roller 31 to each other Chain and timing belt 41 (used in FIGS. 7, 8, and 10 to 13)
An intermediate timing belt in which its own inner peripheral surface is coupled to the outer peripheral surfaces of the driving roller 31 ′ and timing rollers 36 j, 36 s, 36 t, 37 c ′ and the like in a gear shape,

[Belt adjustment mechanism provided with a pinch roller for ensuring safety when the presser belt is broken in FIGS. 14 to 23]
Here, reference numerals in the 50s indicate components newly provided in the belt adjustment mechanism of FIGS. 14 to 19, and reference numerals in the 60s indicate components newly provided in the belt adjustment mechanisms in FIGS. Yes. The reference numerals in the tenth order indicate the same components as those used in the above-mentioned [manual belt adjusting mechanism of FIGS. 1 to 4].
DESCRIPTION OF SYMBOLS 11 Drive roller 11a Rotating shaft of the said drive roller 12 Adjustment side belt 13 Fixed side belt 13 'Fixing hook 14 Endless presser belt 15 Operation lever 16 Drive base (back side)
16a, 16b
Elongated hole portion 16f A connecting shaft between a pair of drive bases 16 17 Tension base (back side)
17a Mounting shaft of the fixed side belt 13 17a 'Support shaft of the fixing hook 13' 17b Tension roller (also a guide roller)
18 b Guide roller 19 Separator 51, 61 Rotating shaft 52 of tension roller 17 b, 62 Rotating shaft 53 of guide roller 18 b 53, 63 Pinch rollers 54, 64 for securing safety when presser belt 14 breaks Mounted pinch rollers 53, 63 Maintenance bases 54a, 64a Holes 54b, 64b which are formed in the maintenance base and set the rotation center thereof. Holes 55, 65 which receive connecting shafts 56b, 66b described later. A shaft for holding the portions 54a and 64a (= the central axis of rotation of the maintenance bases 54 and 64)
56, 66 Connecting arms 56a, 66a Rotating shaft of the tension roller 17b for linking the shafts 51, 61 of the tension roller 17b of the tension base 17 and the pinch rollers 53, 63 of the maintenance bases 54, 64 when the presser belt is broken 51 and 61 are loosely fitted in the initial setting state and the balance state, and in a state where the presser belt is broken, a maintenance hole (see FIGS. 16 and 17) for contacting the predetermined portion and applying the load F to the pinch rollers 53 and 63. , See FIG. 22, FIG. 23, etc.)
56b, 66b A connecting shaft that is formed on the opposite side of the maintenance hole, is linked to the holes 54b, 64b of the maintenance bases 54, 64, and acts as a rotating shaft of the pinch rollers 53, 63. 67 Tension A cam action member 67a that can be rotated about the shaft 11a of the driving roller 11 while being regulated by the rotating shaft 61 of the roller 17b, and holds the pinch roller 63 away from the driving roller in a balanced state. Crank-shaped hole 67b into which the rotation shaft 61 of the tension roller 17b is loosely fitted 67b Cam surface 67c for receiving and holding the maintenance base 64 in a balanced state 67c Step following the cam surface

These belt adjustment mechanisms are all
(21) Belt hoist that lifts and suspends objects held (fixed) on the adjustment side belt
(22) By changing the effective length of the adjustment side belt (decreasing the length of the tension part), for example, it can be used as a belt tensioning machine that tightens and fixes the object placed on the truck bed. is there.

  However, the manual belt adjustment mechanism is generally used as a belt hoist and a belt loader, and the electric belt adjustment mechanism is generally used as a belt hoist.

  Of course, a belt adjustment mechanism in which the adjustment-side belt 12 and the fixed-side belt 13 are continuous is also within the scope of the present invention, and this type is used for, for example, loading a plurality of gas cylinders together. Used as a machine.

  As the adjustment side belts 12 and 32, the fixed side belt 13 and the presser belts 14 and 34, for example, aramid fibers, polypropylene fibers, or stainless steel are used. Thereby, heat resistance, weight reduction, and chemical resistance of the entire belt adjustment mechanism can be achieved.

The manual belt adjustment mechanism in FIG.
(31) A pair of opposing drive bases 16 are integrated by connecting shafts 16f and 16g,
(32) The driving roller 11, the adjustment side belt 12, the fixed side belt 13, the pressing belt 14, the mounting shaft 17a, the tension roller 17b, the guide rollers 18a and 18b, and the pressing roller 18c are arranged in the internal space of the driving base in the opposed plate state. Provided,
(33) The operating lever 15, the tensioning base 17 and the pressing base 18 are provided outside the driving base,
It is an aspect. The operation lever 15 is provided only on one of the pair of drive bases 16.

  In FIG. 1, the mounting shaft 17a of the tension base 17 and the rotating shaft of the tension roller 17b are guided by the elongated holes 16a and 16b of the driving base 16, respectively, and the rotating shafts of the guide rollers 18a and 18b of the pressing base 18 are shown. Are respectively guided by the elongated holes 16c and 16d of the driving base 16, and the rotation shaft of the pressing roller 18c of the pressing base 18 is guided by the elongated holes 16e of the driving base 16.

  In the initial setting state (a), the tensioning base 17 and the pressing base 18 are respectively relative to the driving base 16 (the driving roller 11) in the right direction in the drawing due to the elastic restoring force of the pressing belt 14 and the like. The positional relationship has been moved to.

  Then, by rotating the operation lever 15 in the initial state in the M direction and rotating the drive roller 11 in the clockwise direction, the portion to be pressed of the adjustment side belt 12 (= sandwiched between the drive roller 11 and the press roller 18c). The part is fed rightward in the figure. At this time, the pressing belt 14, the pressing roller 18c, and the other rollers (the tension roller 17b and the guide rollers 18a and 18b) move in the counterclockwise direction.

  By this feeding operation, the work object is tightly fastened by the belt, and finally the balance state (b) is obtained.

And in this balanced state,
(41) The tension base 17 (mounting shaft 17a) integral with the belt is slid relative to the drive base 16 in the left direction in the figure by the load F applied to the fixed side belt 13,
(42) Similarly, the pressing base 18 linked to the tensioning base 17 through the presser belt 14 is also arranged so that the pressing roller 18c and the driving roller 11 are relatively relative to the driving base 16 in the left direction in the figure. Until the adjustment side belt 12 and the presser belt 14 are sufficiently sandwiched between them.

  As a total result of the sliding action of each of the driving base 16 and the pressing base 17, the presser belt 14 is tensioned more strongly than the initial setting state of (a).

  Due to this tension, the adjustment side belt 12 is pressed strongly and uniformly over a wide range of about 3/4 from the guide roller 18b to the pressing roller 18c on the peripheral surface of the driving roller.

  As described above, according to the manual belt adjustment mechanism of the present invention, the adjustment-side belt 12 is sandwiched between the driving roller 11 by the tensioned presser belt 14, and the contact area between the driving roller 11 and the adjustment-side belt 12 is increased. Therefore, slippage between the two can be reliably prevented, and the degree of wear of the adjustment side belt can be significantly reduced.

  This action of preventing slippage and reducing wear also occurs in the electric belt adjusting mechanism described later.

  It should be noted that the interlocking mechanism itself between the drive roller 11 and the operation lever 15 in the M direction only via a ratchet (not shown) at the time of cargo clamping operation or the like, A mechanism for interlocking with the operation lever 15 in the opposite direction is well known, and is also disclosed, for example, in the international application PCT / JP2004 / 003194 filed by the present applicant.

The main difference between the manual belt adjusting mechanism (part 2) of FIG. 2 and that of FIG.
(51) The elongated hole 16a for guiding the mounting shaft 17a of the tension base 17 is not formed in the drive base 16.
(52) The guide roller 18b ′ and the pressing roller 18c are provided on the pressing base 18 in a symmetrical positional relationship around a line that passes through the rotation shaft of the driving roller 11 and coincides with the illustrated sliding direction of the driving base 16. The guide roller 18b ′ also acts as a pressing roller for the pressing belt 14.
And so on.

  In the case of the manual belt adjustment mechanism of FIG. 2, the guide roller 18 b ′ and the pressure roller 18 c are the same in the balance state with respect to the load F as in FIG. Press on. The load received by the guide roller 18b 'and the pressing roller 18c at this time is F / 2.

The manual belt adjustment mechanism (part 3) in FIG. 3 corresponds to that in FIG.
The difference from FIG.
(61) Instead of the fixed side belt 13, a fixing hook 13 ′ is provided on the mounting shaft 17 a of the tension base 17 so as to be rotatable.
(62) The drive base 16 is not provided with a portion such as the elongated hole portion 16a corresponding to the mounting shaft.
And so on.

  The positional relationship between the drive base 16 and the tension base 17 in the initial setting state (a) and the balance state (b) in FIG. 3, the tension state of the presser belt 14 in the balance state (b), and the adjustment side belt 12, respectively. The degree of pressure contact with respect to is the same as that of FIG.

The manual belt adjusting mechanism (part 4) in FIG. 4 corresponds to that in FIG.
The difference from FIG.
(71) Instead of the fixed side belt 13, a fixing hook 13 ′ is provided on the attachment shaft 17 a of the tension base 17 so as to be rotatable.
(72) The drive base 16 is not provided with a portion such as the elongated hole 16a corresponding to the mounting shaft.
And so on.

  The positional relationship between the drive base 16 and the tension base 17 in FIG. 4, the tension state of the presser belt 14 in a balanced state (not shown), the degree of pressure contact with the adjustment side belt 12, and the like are shown in FIGS. It is the same as that.

  FIG. 5 thru | or FIG. 13 has shown the balance state in various types of electrically driven belt hoists.

All of the electric belt hoists shown are
(81) Fixing and holding various work objects on the adjustment side belt 32 after attaching the fixing hook 33 to a strong arbitrary position such as a beam or a column,
(82) In this fixed and held state, the motor 35 is operated to selectively rotate the drive rollers 31 and 31 ′ of the adjustment side belt 32 in the forward and reverse directions, thereby lifting the object and lifting the object. Run the
Is.

  In the initial setting state (not shown) of each of the electric belt hoists shown in FIGS. 5 to 13, the presser belt 34 is not more tensioned than the illustrated balance state due to the action of its elastic force (restoring force). It has become.

  That is, the tension base 37 shown in FIGS. 5 to 7 is rotated clockwise relative to the illustrated balance position with respect to the drive base 36, and the tension bases 37 ′ and FIGS. 37 is rotated counterclockwise from the illustrated balance position.

  Drive rollers 31 and 31 'are mounted on the drive base 36, and tension rollers 37b, 37b' and 37h are mounted on the tension bases 37 and 37 '.

  When various work objects are fixed and held on the adjustment side belt 32 and a load F in the direction shown in the figure is applied to the adjustment base 32 and the fixing hook 33, the tension bases 37 and 37 'are applied to the drive base 36. It rotates and shifts to the illustrated balance state. The drive base 36 also rotates in the electric belt hoist shown in FIGS.

  The presser belt 34 is tensioned by the action of the tension rollers 37b, 37b 'and 37h accompanying the rotation. As a result, the adjustment side belt 32 is sandwiched between the outer peripheral surface of the presser belt and the outer peripheral surfaces of the drive rollers 31 and 31 '. 7, 8, and 10 to 13, the adjustment side belt 32 of the electric belt hoist is sandwiched between the outer peripheral surface of the presser belt 34 and the outer peripheral surface of the intermediate timing belt 41.

  Therefore, the contact area between the adjustment side belt 32 and the driving rollers 31 and 31 '(or the intermediate timing belt 41 integral with the driving roller 31) is also increased, and a sufficient frictional force is ensured between them. As a result, it is possible to reliably prevent the adjustment side belt 32 from slipping during the lifting / hanging operation of the work object, and to significantly suppress wear of the adjustment side belt itself.

  Moreover, since the direction of each load F applied to the adjustment side belt 32 and the fixed hook 33 is set so that both are located on the same vertical line, in the case of any electric belt hoist, the balance state shown in the figure. It stabilizes at.

  The path of the pressing belt 34 of the electric belt hoist shown in FIGS. 5 and 6 is “tension roller 37b—guide roller 36h—guide roller 36g—guide roller 36f—drive roller 31—tension roller 37b”.

  The drive roller portion of the adjustment side belt 32 is sandwiched between the drive roller and the presser belt 34.

  The path of the pressing belt 34 of the electric belt hoist shown in FIGS. 7 and 8 is “tension roller 37b′-guide roller 36h-guide roller 36g-guide roller 36f-drive roller 31'-tension roller 37b '".

  In addition to the drive roller portion of the adjustment side belt 32, the tension roller 37 b ′ and the guide roller 36 f are also sandwiched between the presser belt 34 and the intermediate timing belt 41.

  The path of the pressing belt 34 of the electric belt hoist in FIG. 9 is “tension roller 37h-guide roller 37g-pressing roller 38c-drive roller 31-guide roller 38b-tension roller 37h".

  The drive roller portion of the adjustment side belt 32 is sandwiched between the drive roller and the presser belt 34.

  The path of the pressing belt 34 of the electric belt hoist in FIG. 10 is “tension roller 37h-guide roller 37g-pressing roller 38c-driving roller 31'-guide roller 38b-tension roller 37h".

  In addition to the driving roller portion of the adjustment side belt 32, the pressing roller 38 c and the guide roller 38 b (part) are also sandwiched between the pressing belt 34 and the intermediate timing belt 41.

  The path of the pressing belt 34 of the electric belt hoist in FIG. 11 is "tension roller 37h-guide roller 36h-pressing roller 38f-timing roller 36s-pressing roller 38e-driving roller 31'-guide roller 38b-tension roller 37h". .

  In addition to the driving roller portion of the adjustment side belt 32, the timing roller 36 s and the pressing roller 38 e are also sandwiched between the pressing belt 34 and the intermediate timing belt 41.

  The path of the pressing belt 34 of the electric belt hoist in FIG. 12 is “tension roller 37h-guide roller 36h-pressing roller 38f-timing roller 36s-pressing roller 38g-timing roller 36t-pressing roller 38e'-driving roller 31'-guide. Roller 38b-tension roller 37h ".

  In addition to the driving roller portion of the adjustment side belt 32, the timing roller 36s, the pressing roller 38g, the timing roller 36t, and the pressing roller 38e 'are also sandwiched between the pressing belt 34 and the intermediate timing belt 41.

  The path of the pressing belt 34 of the electric belt hoist in FIG. 13 is "tension roller 37h-guide roller 36h-pressing roller 38f-timing roller 36s-guide roller 36u-drive roller 31'-guide roller 38b-tension roller 37h". .

  In addition to the drive roller portion of the adjustment side belt 32, the timing roller 36 s and the guide roller 36 u are also sandwiched between the presser belt 34 and the intermediate timing belt 41.

  14 to 23 show a belt adjusting mechanism provided with a pinch roller for ensuring safety when the presser belt is broken.

  However, in FIGS. 16, 17, 22 and 23, for example, the maintenance holes 56a and 66a of the connecting arms 56 and 66, the hole 67a of the cam action member 67, and the rotating shafts 51 and 61 of the tension roller 17b In order to facilitate understanding of the positional relationship, the adjustment side belt 12, the presser belt 14, the tension base 17, the tension roller 17b, the guide roller 18b, the pressing rollers 53, 63, and the like are omitted.

  In these belt adjustment mechanisms, the connection arms 56 and 66 are in a so-called “play” state when the presser belts 14 are not broken.

  That is, when the presser belt 14 is operating normally, the position of the maintenance holes 56a and 66a of the connecting arms 56 and 66 is not restricted by the rotary shafts 51 and 61 of the tension roller 17b.

  In the case of the belt adjusting mechanism shown in FIGS. 20 to 23, at least in the balanced state, the connecting arm side end of the maintenance base 64 is in contact with the cam surface 67 b of the cam action member 67.

  As described above, the presser belt 14 in the balanced state in each belt adjustment mechanism of FIGS. 14 to 23 operates in a manner in which the connection arms 56 and 66 are omitted with respect to the drive roller 11 and the adjustment belt 12.

  Therefore, the adjustment-side belt 12 that has received the load F is reliably pressed against the outer peripheral surface of the drive roller 11 by the presser belt 14 as in the balanced state of FIGS.

  The initial setting state of each belt hoist (including the one up to FIG. 13) is such that the driving roller 11 (driving base 16) is lifted by the presser belt 14 as compared with the illustrated balanced state.

  When the presser belt 14 is broken due to deterioration due to repeated use or the like, the drive base 16 slides away from the tension base 17 based on the action of the load F. This sliding motion is relative between the drive base 16 and the tension base 17.

  By this sliding operation, the maintenance holes 56a and 66a of the connecting arms 56 and 66 and the rotating shafts 51 and 61 of the tension roller 17b, which have been in the “play” state as shown in FIGS. The so-called positional relationship shifts to the so-called link setting state of FIG.

  In this link setting state, the maintenance holes 56a and 66a of the connecting arms 56 and 66 are in stable contact with the rotary shafts 51 and 61 of the tension roller 17b in a unique state.

  This unique state is a state where the pinch rollers 53 and 63 can press and hold the adjustment side belt 12 against the driving roller 11.

  In the case of the belt adjusting mechanism (belt hoist) of FIGS. 20 to 23, the cam action member 67 for positively separating the pinch roller 63 in the balanced state from the driving roller 11 is provided. Basically it is different.

  As shown in FIG. 22, the cam acting member 67 in the balanced state has the rotating shaft 61 of the tension roller 17b inserted in the vertical direction portion on the left side of the crank-shaped hole 67a and the cam surface 67b (the driving roller 11). From the above, the maintenance base 64 in the separated state is held. That is, the pinch roller 63 is separated from the drive roller 11.

  When the presser belt 14 is broken, the drive base 16 is moved downward with respect to the rotation shaft 61 (tension base 17) of the tension roller 17b, so that the cam action member 67 attached to the drive roller shaft 11a is also provided. Move together.

  With this movement, the cam action member 67 rotates counterclockwise around the shaft 11a of the driving roller while the hole 67a follows the rotation shaft 61 of the tension roller 17b to be in the state shown in FIG. .

  As a result, the maintenance base 64 that has been held on the cam surface 67b of the cam acting member 67 until then comes off from the cam surface.

  The connecting arm 66 is also moved downward, and the maintenance hole 66a comes into contact with the rotating shaft 61 of the tension roller 17b in the unique manner.

  That is, in the state where the side of the hole 64a which is one end of the maintenance base 64 and the connection arm 66 integrated with the connection shaft 66b is used as an axis, the side of the maintenance hole 66a which is the other end is By moving upward with respect to the drive base 16, the pinch roller 63 of the connecting shaft is moved toward the drive roller 11.

  When the presser belt 14 in FIGS. 21 and 23 is in a broken state, the upper end portion of the hole 67a of the cam action member 67 is not in contact with the rotating shaft 61 of the tension roller 17b.

  The belt adjusting mechanism of the present invention is applied to a belt hoist, a belt loader, or the like. The belt hoist can be used not only for lifting and tightening various work objects such as luggage and construction products, but also in fields such as nursing care.

Claims (6)

In the belt adjustment mechanism that allows the length of the tension portion of the belt to be adjusted based on a predetermined driving operation,
A driving roller for the belt;
A drive base on which the drive roller is mounted;
A presser belt for pressing the belt against the peripheral surface of the drive roller;
A guide roller for setting the path of the presser belt;
A tension base equipped with a tension roller of the presser belt;
The drive base and the tension base are provided in such a manner that the drive base and the tension base move relative to each other in a direction of increasing the tension of the presser belt based on a load applied to the belt.
A belt adjustment mechanism characterized by that. When the presser belt breaks while receiving the load,
Based on a load on the tension base, a pinch roller is provided for pressing the belt against the circumferential surface of the drive roller.
The belt adjusting mechanism according to claim 1. As a member for mounting the pinch roller,
It is movable with respect to the driving base, and when the presser belt breaks, it abuts against the shaft of the tension roller to prevent further relative movement between the driving base and the tensioning base. With a tension roller hole of the aspect, provided with a breakage prevention base,
The belt adjusting mechanism according to claim 2. As a member for regulating the separation state between the pinch roller and the drive roller peripheral surface,
The pinch roller is movable with respect to the drive base and is kept away from the position of pressing against the drive roller during normal operation of the presser belt, and when the presser belt is broken. A separation base having a surface portion for moving relative to the tension base to release the holding state is provided.
4. The belt adjustment mechanism according to claim 2, wherein the belt adjustment mechanism is provided. A belt adjustment mechanism according to any one of claims 1 to 4 is provided, and the work object is moved up and down by the action of the belt adjustment mechanism.
A belt hoist characterized by that. A belt adjustment mechanism according to any one of claims 1 to 4 is provided, and the work object is tightened by the action of the belt adjustment mechanism.
A belt compaction machine characterized by that.

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