JPH0542276U - Hydraulic elevator jack - Google Patents

Abstract

(57) [Summary] [Purpose] Prevent foreign substances such as cotton dust from being carried to the oil sump. [Structure] At the upper end of the cylinder 1 standing in the hoistway,
A gland 4 for guiding a plunger 2 that can move in and out of the cylinder 1 is provided, and a gland packing 5 for closing a gap between the gland 4 and a sliding surface of the plunger 2.
And packing retainer 6 that holds this gland packing 5
In the jack of the hydraulic elevator provided with the oil reservoir 3 which is formed of a ring-shaped groove and receives the oil leaked through the gland packing 5, the outer periphery of the packing retainer 6 is
It is characterized in that the filter 14 protruding upward is wound.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a jack for a hydraulic elevator that includes a cylinder that is erected in a hoistway and a plunger that can move in and out of the cylinder.

[0002]

[Prior Art]

 Conventionally, as disclosed in, for example, Japanese Patent Application Laid-Open No. 57-199779, a gland packing for closing a gap between a sliding surface of a plunger and a gland packing for holding the gland packing is provided in a gland at an upper end of a cylinder for accommodating the plunger. A hydraulic elevator jack equipped with a packing retainer has been proposed. In such a jack of a hydraulic elevator, since a little oil adheres to the sliding surface of the plunger for lubrication, the sliding resistance with the gland packing is reduced and the riding comfort of the car is improved. The stat bolt provided on the gland is operated to adjust the pressing force of the packing retainer so that only a specified amount of oil leaks through the gland packing. The oil that leaks adheres to the sliding surface of the plunger and is scraped off by the dust seal as the plunger slides, passing through the upper part of the seal retainer that holds this dust seal, and the oil that forms on the upper end of the gland is formed. It flows down into the sump and accumulates, and then returns from this sump to the oil tank through a drain pipe.

Since dust is often floating in the hoistway provided with the above-mentioned jack, in order to prevent the dust from falling into the oil sump, a donut is provided above the oil sump. A dustproof cover formed into a shape is provided.

[0004]

[Problems to be solved by the device]

 By the way, in the conventional hydraulic elevator jack described above, when it is installed in textile wholesalers, department stores, hospitals, hotels, etc., a considerable amount of cotton dust is floating in the hoistway. There was a concern that the dust adhered to the oil leak on the sliding surface of the plunger and was carried to the oil sump together with the oil leak, and as a result, the cotton dust contained in the oil leak clogged the drain piping.

The present invention has been made in view of the situation in the prior art as described above, and an object thereof is to prevent foreign matter such as cotton dust adhering to the oil leakage on the sliding surface of the plunger from being carried to the oil sump. The object is to provide a hydraulic elevator jack that can be blocked.

[0006]

[Means for Solving the Problems]

 In order to achieve this object, the present invention is provided with a gland for guiding a plunger that can move in and out of the cylinder at the upper end of a cylinder that is erected in the hoistway. In the jack of the hydraulic elevator provided with a gland packing for closing the gap of the gland packing, a gland packing for holding the gland packing, and an oil sump made of a ring-shaped groove for receiving oil leaked through the gland packing. A filter protruding upward is wound around the outer periphery of the packing retainer.

[0007]

[Action]

 In the present invention, as described above, the filter protruding upward is wound around the outer periphery of the packing retainer, so that the oil leaking through the gland packing adheres to the sliding surface of the plunger, and then the plunger slides. When it is scraped off by the dust seal and flows down to the top of the packing retainer, this oil leak is filtered by the filter protruding upward. As a result, foreign matters such as cotton dust contained in the leaked oil are captured by the filter and remain on the upper part of the packing retainer, and only the filtered oil flows down and accumulates in the oil sump. This prevents foreign matter such as cotton dust from adhering to the oil leak on the plunger sliding surface from being carried to the oil sump.

[0008]

【Example】

 An embodiment of a jack for a hydraulic elevator according to the present invention will be described below with reference to the drawings. FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a jack for a hydraulic elevator according to the present invention, and FIG. 2 is a perspective view of a filter provided in the jack of FIG.

As shown in FIG. 1, a jack for a hydraulic elevator generally includes a cylinder 1 standing upright in a hoistway and a plunger 2 that can move in and out of the cylinder 1. A gland 4 is provided at the upper end of the cylinder 1 for guiding the plunger 2 and having an oil sump 3 formed of a ring-shaped groove. The gland 4 is attached to the gland packing 5 that closes the gap between the sliding surface of the plunger 2, the packing retainer 6 that holds the gland packing 5, and the upper part of the gland packing 5, and engages the sliding surface of the plunger 2. Dust seal 7 which fits together, seal retainer 8 which is attached to packing retainer 6 and holds dust seal 7, and stud bolt 9 and nut 10 which engage with packing retainer 6 and seal retainer 8 by screwing on gland 4 And a dust-proof cover 11 which is gripped by these nuts 10 and formed in a donut shape. The oil reservoir 3 is connected to an oil tank 13 via a drain pipe 12.

In the jack of this embodiment, the filter 14 protruding upward is wound around the outer periphery of the packing retainer 6. As shown in FIG. 2, the filter 14 includes a pair of mesh members 15 and 16 composed of a mesh material having a relatively fine mesh, such as a repellent net, and the mesh members 15 and 16, respectively. The hinge 17 has one end rotatably connected to it, and the stoppers 18 to which the other ends of the mesh members 15 and 16 can be connected.

In this embodiment, the mesh members 15 and 16 of the filter 14 are gripped in an open state, and the packing retainer is pressed with the upper portions of the mesh members 15 and 16 protruding above the seal retainer 8. After being wound around the outer peripheral portion of 6, the respective other ends of the mesh members 15 and 16 are connected by a fastener 18. After that, the oil leaked through the ground packing 2 during the operation of the hydraulic elevator adheres to the sliding surface of the plunger 2, and is scraped off by the dust seal 7 as the plunger 2 slides, and the upper part of the seal retainer 8 is removed. When it still flows down, it is filtered by the filter 14. At this time, foreign matter such as cotton dust contained in the leaked oil is captured by the filter 14, so the foreign matter remains on the upper part of the seal retainer 8 and only the filtered oil flows down into the oil sump 3. Collect.

In the embodiment configured as described above, it is possible to prevent foreign matter such as cotton dust adhered to the oil leakage on the sliding surface of the plunger 2 from being carried to the oil sump 3. In addition, in this embodiment, since the hinge 17 that rotatably connects one end of each of the mesh members 15 and 16 and the stopper 18 that can connect each other end of the mesh members 15 and 16 are provided, the filter 14 It is easy to wind the packing around the packing retainer 6.

Although the filter 14 including the mesh members 15 and 16 and the like is provided in this embodiment, instead of the mesh members 15 and 16 and the like, as shown in FIG. It is also possible to provide a filter 22 having a band-shaped mesh material 21 rich in water. As shown in FIG. 4, the mesh member 21 is provided with a velcro tape 23 whose both ends can be connected to each other.

[0014]

[Effect of the device]

 Since the present invention is configured as described above, it is possible to prevent foreign matter such as cotton dust adhering to oil leakage on the sliding surface of the plunger from being carried to the oil sump, thus connecting the oil sump and the oil tank. It is possible to prevent clogging of the drain pipe.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view of a main part showing an embodiment of a jack for a hydraulic elevator according to the present invention.

FIG. 2 is a perspective view of a filter included in the jack of FIG.

FIG. 3 is a vertical cross-sectional view of an essential part showing an application example of a filter provided in the jack of the hydraulic elevator according to the present invention.

FIG. 4 is a perspective view of the filter shown in FIG.

[Explanation of symbols]

 1 Cylinder 2 Plunger 3 Oil sump 4 Gland 5 Gland packing 6 Packing retainer 14 Filter 15, 16 Mesh member 17 Hinges 18 Stopper 21 Mesh member 22 Filter 23 Magic tape

Claims (1)

[Scope of utility model registration request] 1. A gland packing for providing a gland for guiding a plunger that can move into and out of the cylinder at an upper end of a cylinder that is erected in the hoistway, and a gland packing that closes a gap between the gland and a sliding surface of the plunger. In a jack of a hydraulic elevator provided with a packing retainer for holding the gland packing and an oil reservoir made of a ring-shaped groove for accepting oil leaked through the gland packing, an upper portion is provided above the outer periphery of the packing retainer. A jack for a hydraulic elevator, characterized in that a filter protruding inward is wound.