JPS6077100A - Lever type hoist - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION This invention provides for the attachment and detachment of the drive shaft binion and the reduction gear train that meshes with the drive shaft and transmits the rotation of the drive shaft to the load sheave.
This invention relates to a lever set hoist that operates by moving a manually operated wheel integrated with a drive shaft forward and backward in the axial direction when no load is applied.

As this type of lever type hoist, the applicant had previously
J, I have proposed the structure disclosed in Publication No. 57-72595. This hoist is equipped with a drive part and a driven member on the threaded part of the drive shaft with a friction type brake part in between, and is driven by a lever member connected to one end of the drive shaft via the drive member and the extraction drive member. The shaft is rotationally driven, and the rotation of the drive N1 is transmitted to the load sheave via a reduction gear train that meshes with a binion at the other end, and a drive shaft holding plate is provided concentrically with the driven member. At the same time, a rotation prevention pin is protruded from one of a pair of side plates supporting the load sheave, and a rotation prevention pin is inserted into the opening of the holding plate facing the load sheave to drive this holding plate. When the shaft is movable only in the axial direction, a locking lever is provided near the portion of the side plate facing the holding plate, and the locking lever is set to an advanced position where it overlaps with the surface side of the drive holding plate. , is configured such that when the locking lever is set at a position where the pinion of the drive 611 and the reduction gear train mesh and overlap with the back side of the holding plate, the pinion and the reduction gear train become disengaged. This is what I did.

However, in the hoist having the above configuration, when a load is applied to the load sheave while the pinion and the reduction gear train are engaged, there is a risk of accidentally operating the locking lever and releasing the engaged state. There is a danger that the load sheave may spin and the suspended load may fall.

The present invention eliminates the above-mentioned drawbacks in the conventional example and provides a safe four-lever hoist that is free from the risk of disengagement between the drive side binion and the deceleration TK train due to erroneous operation during loading. With the goal.

To explain the embodiment', reference numeral 1 denotes a drive gear shaft that rotates a load sheave 2. The drive gear shaft 1 has a shaft portion Ia that rotatably holds the load sheave 2, and a brake plate holding member. 3 and a portion that engages with the brake temporary holding member 4 is formed with a threaded portion 1b. A pair of side plates 5 and 6 that hold the load sheave 2 are connected to the stem bolt 7.
Hook connecting frames 8 are attached to the upper ends of the side plates 5 and 6, which are held at a constant interval by the ridges, so as to protrude toward the side plates 5.

Power transmission between the drive gear shaft 1 and the load sheave 2 rotatably attached to the drive gear shaft 1 is achieved by a drive pinion 9 integrally attached to the right end of the drive gear shaft 1 in FIG. This is done by reduction gear train A. Reduction gear train A
is the side plate 6 and gear cover 1 that mesh with the pinion 9.
0, an intermediate driven gear 12 held by a shaft 11 between the intermediate driven gear 12, a second intermediate driven gear 13 integral with this gear 12, and a second intermediate driven gear 13 fixed to the right side boss portion 2a of the load sheave 2 and engaged with the second intermediate driven gear 13. It consists of 14 roads and cities. The intermediate driven gear 12 and the second intermediate driven gear 13 that connect the drive pinion 9 and the load gear 14 are
A plurality of them can be provided as necessary.

A brake plate holding member 3 is attached to the threaded portion 1b of the drive gear shaft l.
is screwed into the position where it abuts the end surface of the stepped portion of the ff1ll+ portion 1a, and the boss portion 3a of the brake plate holding member 3 has a mold wheel 15 and friction &16 disposed on both sides thereof.
L 6 is attached to the L. Model wheel 15 and friction plate 1
6.16 is pressed and held against the end surface of the brake plate holding member 3 by the side end surface of the brake temporary holding member 4 which is also screwed onto the threaded portion lb. 1
7 is a spline 1 on the boss portion 4a of the brake temporary holding member 4.
A known rotational direction switching pawl 21 is engaged with the two wheels 17, which is biased by an elastic suppressing member 20 mounted inside the operating lever 19. The rotation direction is switched by a handle 22 coupled to a rotation direction switching pawl 21.

In addition to the ratchet gear 17, the boss portion 4a of the brake temporary holding member 4 has a spline 18 for manual operation @23.
[Therefore, the snap ring 24 fitted into the boss portion 4a presses the sill diet member 17 toward the end surface of the brake temporary holding portion t (4). 4 is the threaded portion I of the drive gear shaft l
It is tightened via a washer 26 by a nut 25 that is screwed into the screw shaft portion 1c formed on the b side and has a smaller diameter than that of the screw shaft portion 1c, and the nut 25 is taken so as to pass through the screw shaft portion 1c. The split bottle 27 prevents the loosening of the threaded connection with the screw shaft portion 1c from becoming larger than a preset value.

Reference numeral 28 denotes a drive shaft holding plate fitted concentrically to the outer 1M portion of the brake temporary holding member 3. 3b and the snap ring 29 to prevent separation from the brake plate holding member 3, and the brake plate holding member 3 and the holding plate 28 are rotated in phase υ:ii.
It is designed to be a J-Noh performance. An engagement hole 2 is provided at the upper side of this holding &28 at the tq-portion opposite to the hook connecting culm 8.
A stomper bin 8a, which is an extension of the hook connecting culm 8 shown in 1) q and projects from the side plate 5, is inserted into the opening 28a of the holding plate 28. In the body of the stopper bin 8a, there is a series 1 joint groove 30 with dimensions 11) i and f corresponding to the thickness of the holding plate 28.
has been done.

Reference numeral 31 denotes a locking lever, which is pivotally connected to the side plate 5 by means 132, and its operating end 31a is connected to the stopper pin 8 by a spring 33.
T'L (II! IK is biased. Then, as shown in FIG. 2, the drive gear shaft 1, brake plate holding member 3, and brake temporary When the entire driving side including the presser member 4, the holding plate 28, etc. is pressed, the locking lever 31 is moved from the state shown in blank lines in FIG. This prevents the driving gear shaft l from moving to the left and prevents the pinion 8 from disengaging from the intermediate driven gears 12 and 12. At this time, the retaining plate 28 comes to a position where the edge of the opening 281L engages with the engagement @30 of the stopper pin 8a.On the other hand, the locking lever 31 is pushed against the biasing force of the spring 33 by its operating tail end 31b. 4, and then move the drive tooth center axis l to the left as shown in FIG. 3 via the manual operation wheel 23, and then 9 intermediate driven gear 12, l2
When the engagement is released, the locking lever 31 is biased by the spring 33 so that it hits the stopper pin 8a so that its operating end 31a overlaps the back side of the holding plate 28, as shown by the solid line in FIG. Make it appear until.

This prevents the drive gear shaft l from moving to the right and prevents the pinion 9 from meshing with the intermediate driven gears 12, 12.

34 is a known reverse rotation prevention pawl that engages with the hull 15;
It is pivotally connected to the retaining plate 28 by the spring 36, and serves to prevent the hull 14 from rotating in the opposite direction due to the biasing force of the spring 36. In FIG. 1, 37 is a hook attached to the hook connecting culm 8 via a fitting 38.

In this lever set hoist, as shown in FIGS. 1 and 2, the operating end 31a of the locking lever 31 overlaps the surface side of the retaining plate 28, and the pinion 9 is connected to the intermediate driven gear 12, 12.
When the drive gear shaft 1 is in mesh with the drive gear shaft 1, the movement of the drive gear shaft 1 in the axial direction is caused by the action of the brake plate holding member 3, which is threadedly engaged with the drive gear shaft 1 and is only rotatably connected to the holding plate 28. Since this is reliably prevented, by repeatedly rocking the operating lever 19, the ratchet gear 17 can be rotated in one direction determined by engagement with the rotational direction switching pawl 21.

The rotation of the ratchet tooth #L170 is transmitted to the brake temporary holding member 4 via the spline 18, and the rotation is transmitted from the drive gear shaft 1 screwed with the brake temporary holding member 4 to the pinion 8.
The load is transmitted to the load chain 14 integrally attached to the load sheave 2 via the deceleration tooth table row A), and the load is transmitted to the load chain 39 shown in FIG. 1 attached to the load sheave 2. Performs winding and traction action. On the other hand, the brake temporary holding member 4 rotates the hull 15 in the same direction via the friction plates 16 and 16 together with the brake plate holding member 3 which rotates together with the drive gear shaft l, and is attached to the holding plate 28 by the shaft 35. In order to prevent the reverse rotation of the drive gear shaft 1 by the action of the claw 340, the lifting and pulling of the load can be performed continuously by simply repeatedly rocking the operating lever 19 without loosening it midway. can. At this time, the holding plate 28 is similarly moved to the mold wheel 15, which is urged in the reverse rotation direction by the load applied to the load sheave 2, through the pawl 34 that acts to prevent the reverse rotation. Since it is biased in the reverse direction of rotation shown by the arrow P in FIG. 6, the edge of the opening 28a of the holding plate 28 fits into the engagement groove 30 of the stopper pin 8a as shown in FIGS. 5 and 6. match. Therefore, even if the locking lever 31 is returned to the state shown by the 111th provisional line due to an erroneous operation under a load, the engagement groove 30 of the stopper pin 8a and the opening 28 of the retaining plate 28
Due to the fit between the lip of a, movement of the drive gear shaft 1 is avoided, and in the loaded state the pinion 9 and the intermediate driven gear 12.12
Dangerous situations such as disengagement between the two are reliably prevented.

To release the engagement between the pinion 9 and the intermediate driven gears 12 and 12, use one hand to move the operating tail end 31b of the locking lever 31 around the shaft 32 against the biasing force of the υ spring 33. Rotate to the position indicated by the gray line in Figure 4, and then press the stop lever 3I.
With the holding plate 28 released, pull the manual operation M23 to the left with the other hand, move the holding plate 28 along with the brake plate holding member 3 along the stopper bin 8a, and move the holding plate 28 to the left side of the pinion 9. Concave hole 2 with load sheave 2 surface
It is sufficient to release the pressing force that rotates the locking lever 31 at a position where the locking lever 31 almost contacts the side wall portion of the locking lever 31.

In this case, the locking lever 31 is pressed toward the stopper bin 8a by the biasing force of the spring 33, and as shown by the solid line in FIG. In this state, if one side of the load chain 39 attached to the load sheave 2 is pulled, the reduction gear train Δ
Since the load sheave '2 which is released from the load sheave '2 easily spins idly, the length of the load chain 39 can be adjusted in a short time with little force.

As described above, according to the lever set hoist of this invention,
The meshing and non-meshing states between the drive-side pinion and the reduction gear train can be set and maintained safely and reliably by switching the engagement member (the engagement lever 31). Even if you accidentally operate the mating member and try to set it to the side where the pinion and the reduction gear train are disengaged, the lipstick in the opening of the holding plate will not fit in with the engagement RE of the rotation prevention pin (stopper pin 8a). Since the above-mentioned disengagement is reliably prevented by the coupling action, a dangerous small portion where the pinion and the reduction gear train become disengaged under load can be avoided.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view showing an embodiment of the present invention, Fig. 2 is a sectional view showing the embodiment in an operating state, Fig. 3 is a sectional view showing the embodiment in a non-operating state, and Fig. 4. 5 is a side view of the main part of the embodiment, and FIGS. 5 and 6 are a sectional view and a partial side view of the main part showing the fitting shape of the stopper pin and the retaining plate, respectively. l... Drive msu (shaft, 2... Load sheave, 3...
・Brake plate holding member, 4...brake temporary holding member,
5゜6... Side plate, s a... Stopper pin (rotation prevention pin), 15... Claw type, 16... Friction plate, 17
...radiet gear, 18...spline, 19.
... Operating lever, 23... Manual operation wheel, 28... Drive shaft holding plate, 28a... Opening, 30... Engagement groove,
31... Locking lever (locking member), 34... Reverse rotation prevention claw Applicant Vital Kogyo Co., Ltd. Figure 2 Figure 3

Claims (1)

[Claims] A load sheave supported between a pair of side plates, a drive shaft that is inserted into the shaft hole of the load sheave and can freely move forward and backward in the axial direction.
An operating lever associated with one end of the drive shaft, a driving member and a driven member screwed together with the threaded portion of the drive shaft between the operating lever and one side plate, and an inverter provided between the driving member and the broken drive part. In a hoist equipped with a rotation prevention flake mechanism and a transmission gear train provided between the other end of the drive shaft and a load sheave, a drive shaft retaining plate is pivotally mounted concentrically to the driven member, and a body A rotation prevention pin, which is provided with an engagement groove around the part and protrudes from one of the side plates, is inserted into the opening of the holding plate opposite thereto, so that the holding plate is movable only in the axial direction of the drive shaft, and the side plate A locking member is provided near a portion facing the holding plate for reciprocating operation, and when the locking member is in a forward movement position overlapping the front and back sides of the driving holding plate, the transmission gear The pinion at the other end of the drive shaft forming the driving side of the series and the driven side power transmission toothpaste are held in meshed and non-meshed states, and a retaining plate that is rotated and biased by a load in the meshed state is attached to the edge of the opening. A lever set hoist characterized in that the lever is engaged with an engagement groove of a rotation prevention pin.