GB1560042A - Composite friction elements - Google Patents
Composite friction elements Download PDFInfo
- Publication number
- GB1560042A GB1560042A GB3046077A GB3046077A GB1560042A GB 1560042 A GB1560042 A GB 1560042A GB 3046077 A GB3046077 A GB 3046077A GB 3046077 A GB3046077 A GB 3046077A GB 1560042 A GB1560042 A GB 1560042A
- Authority
- GB
- United Kingdom
- Prior art keywords
- friction
- friction material
- composite
- concavity
- supporting member
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
- 239000002131 composite material Substances 0.000 title claims description 58
- 239000002783 friction material Substances 0.000 claims description 91
- 239000002184 metal Substances 0.000 claims description 61
- 230000013011 mating Effects 0.000 claims description 19
- 239000000463 material Substances 0.000 claims description 7
- 239000011230 binding agent Substances 0.000 claims description 5
- 229910052500 inorganic mineral Inorganic materials 0.000 claims description 5
- 239000002557 mineral fiber Substances 0.000 claims description 5
- 239000003607 modifier Substances 0.000 claims description 5
- 239000011347 resin Substances 0.000 claims description 5
- 229920005989 resin Polymers 0.000 claims description 5
- 238000003780 insertion Methods 0.000 claims description 4
- 230000037431 insertion Effects 0.000 claims description 4
- 230000015572 biosynthetic process Effects 0.000 claims description 2
- 238000010276 construction Methods 0.000 description 3
- 239000000843 powder Substances 0.000 description 2
- 206010039203 Road traffic accident Diseases 0.000 description 1
- 239000010425 asbestos Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000006229 carbon black Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005011 phenolic resin Substances 0.000 description 1
- 229910052895 riebeckite Inorganic materials 0.000 description 1
- NTHWMYGWWRZVTN-UHFFFAOYSA-N sodium silicate Chemical compound [Na+].[Na+].[O-][Si]([O-])=O NTHWMYGWWRZVTN-UHFFFAOYSA-N 0.000 description 1
- 229920001187 thermosetting polymer Polymers 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D69/02—Composition of linings ; Methods of manufacturing
- F16D69/025—Compositions based on an organic binder
- F16D69/026—Compositions based on an organic binder containing fibres
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D69/00—Friction linings; Attachment thereof; Selection of coacting friction substances or surfaces
- F16D2069/002—Combination of different friction materials
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Braking Arrangements (AREA)
Description
(54) COMPOSITE FRICTION ELEMENTS (7,1) We, KOMORI SEISAKUSHO COM
PANY LIMITED, a Japanese corporation, --f 40-13, 1-chome, Higashi Tamagawa, Satagayaku, Tokyo, Japan, do hereby declar the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: This invention relates to a composite friction element comprising a supporting member carrying a brake lining or clutch facing for a vehicle.
Owing to the traffic congestion resulting from the marked increase of vehicles in recent years, the use of the brake and/or clutch has become more frequent and the load applied thereto is often much higher.
In addition, the chances of stopping or starting the car and going slow still continue to increase because of the installation of more traffic signals and the addition of "Stop" or "Go Slow" signs for the purpose of preventing traffic accidents.
Accordingly, wear on the organic friction materials (namely, the friction materials of bonded mass consisting of an inorganic mineral fiber, friction modifiers and an organic resin binder) constituting the brake lining or the clutch facing tends to be increasingly heavy. Replacement of these friction materials involves disassembly and as sembly operations which require manv manhours and considerable expense. It is also important to note that the performance of these friction materials is legally determined in terms of safety.
When the friction material is used as a brake lining, the kinetic energy is instantaneously converted into heat energy by the lining, elc. so as to perform a braking function. On the other hand, a clutch facing serves to transmit smoothly the rotation of the engine to the wheels and heat energy is generated by friction in performing the transmission function. In either case, the friction material is always subject to wear.
In general, a friction material having a higher wear resistance is small in friction coefficient and tends to present slippage or noise problems. On the contrary, a friction material having a large friction coefficient is worn away at a higher rate, though such a material is free from the above problems.
Sintered metal friction material is a typical example of a material having a low friction coefficient, with the friction material of a high friction coefficient being provided by an organic friction material. The organic friction material is prepared by bonding an inorganic mineral fiber such as asbestos and friction modifiers such as rubber powder, carbon black and silican powder, using an organic resin binder such as thermosetting phenol resin.
In addition, the sintered metal friction material gives rise to difficulties such as a high manufacturing cost and a high attacking property to the mating member such as brake drum, brake disc, pressure plate or fly-wheel, resulting in a higher wear rate of the mating member. In spite of the above drawbacks, the sintered metal friction material is highly advantageous in its higl wear resistance.
A friction element based on the combination of the sintered metal friction material and organic friction material is also proposed as disclosed in, for example, Japanese
Patent Publication No. 13807/72. In this case, a number of pieces of sintered metal friction material are disposed on a supportting member made of metal at predetermined intervals and an organic friction material is used to fill the clearances between the pieces of the sintered metal friction material. Indeed, a friction element of this type exhibits an improved wear resistance, but is not satisfactory in anti-attacking property to the mating member though the anti-attacking property mentioned is somewhat improved compared with the conventional sintered metal friction material. The insufficient anti-attacking property is derived
from the arrangement that the Ipieces of sintered metal friction material are in direct contact with the metal supporting member. To be more specific, the sintered metal friction material has a higher thermal conductivity than the organic friction material.
Thus, the heat generated by the sliding motion of the friction element over the mating member is rapidly dissipated through the sintered metal friction material and the metal supporting member directly connected thereto. It follows that the temperature of the sintered metal friction material is rendered lower than that of the organic friction material. What should be noted is that the low temperature portions tend to attack the mating member, leading to an insufficient anti-attacking property of the friction element.
An object of this invention is to provide a composite friction element free from the above-noted difficulties inherent in conventional friction materials, which uses in combination a sintered metal friction material and an organic friction material.
The composite friction element according to this invention comprises a supporting member, a layer of organic friction material on one face of the supporting member, said organic friction material being a bonded mass consisting of an inorganic mineral fiber, friction modifier and an organic resin binder, said layer having one or more recesses in that face thereof remote from the supporting member, and a sintered metal tance and, thus, is markedly superior to the conventional friction material in durability because debris of the sintered metal friction material is isolated from the supporting member The composite friction element according to the invention exhibits a high wear resisfriction material inserted into said one or more recesses, which extend only partially through the thickness of the organic friction material layer so that the metal friction material adheres to the friction surface and forms a film when the friction element makes a sliding motion over the mating member. Further, the composite friction element of this invenuon is free from slippage and noise. Still further, the attacking property to the mating member is negligible because the sintered metal friction material is not in direct contact with the supporting meMber made of metal. Namely, the organic friction material intervenes between the sintered metal friction material and the metal supporting member. This particular construction serves to prevent the sintered metal friction material from undue temperature reduction, resulting in that the attacking property to the mating member is rendered negligible.
This invention will be more fully understood from the following detailed description when taken in conjunction with the accompanying drawings, in which:
Fig. 1 is a plan view showing a composite friction element constituting a brake lining of a vehicle, according to one embodiment of this invention;
Fig. 2 is a cross sectional view along the line II--II of Fig. l; Fig. 3 is a plan view showing a composite friction element constituting a clutch facing of a vehicle, according to another embodiment of this invention;
Fig. 4 is a cross sectional view along the line IV-IV of Fig .3;
Fig. 5 is a partial plan view showing a composite friction element constituting a brake lining of a vehicle, according to another embodiment of this invention
Fig. 6 is a cross sectional view along the line VI-VI of Fig. 5;.
Fig. 7 is a partial plan view showing a composite friction element constituting a clutch facing of a vehicle, according to an other embodiment of this invention
Fig. 8 is a cross sectional view along the line VIII--VIII of Fig. 7;
Fig. 9 is a partial plan view showing a composite friction element constituting a clutch facing of a vehicle, according to another embodiment of this invention Fig. 10 is a cross sectional view along the line X-X of Fig. 9;
Fig. 11 is a vertical cross sectional view showing a composite friction element constituting a brake lining of a vehicle, according to another embodiment of this invention; and
Fig. 12 is a vertical cross sectional view showing a composite friction element con stituting a clutch facing of a vehicle, according to still another embodiment of this invention
In all cases. the composite friction element consists of a supporting member carryink a friction layer constituting a brake lining or clutch facing. In the drawings, the supporting member is omitted, as the invention is primarily concerned with the construction of the friction layer. It will be understood, however, that this supporting member may be of any suitable kind known or used in the vehicle industry.
The composite friction element 1 shown in
Figs. 1 and 2 constitutes a brake lining. As shown in the drawings, the elernent 1 comprises a layer of organic friction material 2 and a sintered metal friction material 4. The organic friction material 2 is provided with a plurality of recesses or concavities 3 extending partly through the layer from the surface remote from the supporting member which is brought into sliding contact with the mating member. The sintered metal friction material 4 is inserted into, and if necessary, bonded into these concavities 3. Further, a plurality of holes
S are bored through the organic friction material 2. Fastening members such as rivet) or machine screws are inserted through the holes 5 so as to fasten the composite friction layer to the supporting member.
The composite friction element 1 is brought into contact with a brake drum rotating in the direction shown by an arrow in Fig. 1 so as to perform a braking function. It is important to note that the sintered metal friction material 4 is disposed in a manner to make a sliding motion over a large area of the surface d the rotating brake drum. Specifically, fine pieces of sintered metal friction material shown in
Fig. 1 are arranged to form a continuous contact line substantially crossing the composite friction element 1 as viewed from the forward side. Thus, substantially all the surface area of the brake drum getting in touch with the composite friction element 1 is brought into sliding contact with the sintered metal friction material 4 while a braking function is being performed.
In Fig. 1, the sintered metal friction material 4 is disposed on the right-hand side portion alone of the composite friction element 1, but the material 4 may be disposed, as required, on the central and left-hand side portions, as well.
A composite friction layer 6 shown in
Figs. 3 and 4 constitutes a clutch facing. As is the case with the composite friction element 1 shown in Figs. 1 and 2, the layer 6 comprises the organic friction material 2 and the sintered metal friction material 4. A plurality of concavities 3 are formed on that side of the organic friction material 2 which is brought into sliding contact with the mating member and the sintered metal friction material 4 is inserted into these concavities 3. Further, a plurality of holes 5 are bored through the composite friction layer 6. Fastening members such as rivets or machine screws are inserted through these holes 5 so as to fasten the layer 6 to a disc spring as the supporting member.
The element 6 is brought into contact with a rotating member like a fly-wheel. As is the case with the element 1 shown in Figs.
1 and 2, the element 16 is dotted with the sintered metal friction material 4 such that the material 4 makes a sliding motion over a large area d the surface of the mating member. Specifically, pieces of the sintered metal friction material are arranged on the inner and outer portions of the element 6 as shown in Fig. 3.
Figs. 5 and 6 jointly show a composite friction element 7 constituting a brake lining, according to another embodiment of this invention. The element 7 is substantially the same as the element 1 shown in Figs. 1 and 2 except that the sintered metal friction material 4 is inserted into a concavity 3 having openings 3a and 3b at the both ends, respectively. Figs. 7 and 8 jointly show a composite friction element 8 constituting a clutch facing, according to another etnl:odi- ment of this invention The element 8 is sub stantially the same as the element 6 shown in Figs. 3 and 4, except that the sintered metal friction material 4 is inserted into the concavity 3 having end openings 3a and 3b, as is the case with the element 7.
Figs. 9 and 10 jointly show a composite friction element 9 constituting a clutch facing. according to another embodiment of this invention. The element 9 is substantially the same as the element 8 shown in
Figs. 7 and 8 except that the concavity 3 and the sintered metal friction material 4 in the outer portions of the element 9 become smaller in width toward, the opening 3a. This construction is effective in that the sintered metal friction material 4 is not removed from the opening 3a when the element 9 makes a sliding motion on the mating member.
Incidentally, the reference numerals are commonly used throughout Figs. 1 to 10.
The complete friction element of this invention exhibits excellent properties. For example, the element is high in durability and free from slippage and noise as described Ipreviously. Further, the composite friction element does not attack the mating member because the organic friction material 2 intervenes between the sintered metal friction material 4 and a metal supporting member. Namely, the supporting member is fixed to that side of the composite friction layer which is not brought into sliding contact with the mating member, i.e.. to the underside of the element shown in Fig. 2, 4, 6, 8 or 10. The presence of the organic friction material 2 between the sintered metal friction material 4 and the metal supporting member serves to break the heat passageway directly connecting the sintered metal friction material 4 and the metal supporting member. Accordingly, an undue temperature reduction of the sintered metal friction material 4 is prevented, resulting in that the composite friction element does not attack the mating member.
The composite friction elements 1 and 6 shown in Figs. 1 to 4 are not provided with openings corresponding,to the openings 3a and 3b shown in Figs. 5 to 10. The absence of such an opening renders it somewhat difficult to insert sufficiently the sintered metal friction material 4 into the concavity 3 because of the presence of the air remaining within the concavity 3.
Composite friction elements 10 and 11 shown in Figs. 111 and 12, respectively, are intended to overcome the above-noted difficulty. The. element 10 constitutes a brak lining and corresponds to the element 1 shown in Figs. 1 and 2. On the other hand, the element 1!1 constitutes a clutch facing and corresponds to the element 6. shown in Figs. 3 and 4. The sole difference between the elements 1 and 10 and between the elements 6 and - 11 is that each of the elements 10 and 11 is provided with a small hole 12 extending from the bottom of -the concavity 3 to that surface of the element which is not brought into contact with tile mating member, i.e. the surface adjacent the supporting member. Naturally, the composite friction elements 10 and 11 permit the air within the concavity 3 to be released through the small hole 12 when the sintered metal friction material 4 is in-.
serted into the concavity 3, thereby achieving a perfect insertion of the material 4 into the concavity 3.
Each of the composite friction elements 7, 8 and 9 shown in Figs. 5 to 10 is provided with the openings 3a and 3b at the ends of the concavity 3, but a small hole corresponding to the small hole 12 of the elements 10 and 11 shown in Figs. 11 and 12 is not formed in these elements 7, 8 and 9. Although the openings 3a and 3b serve to release the air within the concavity 3 in the insertion step of the sintered metal friction material 4, each of these elements 7, 8 and 9 may also be provided with such a small hole. Quite naturally, an additional formation of such a small hole further facilitates releasing the air within the concavity 3 and, thus, inserting the sintered metal friction material 4 into the concavity 3.
The supporting member is fixed to that side of the composite friction layer which is not brought into contact with the mating member. Thus, where the somposite friction layer is provided with such a small hole 12 as shown in Figs. 11 and 12, the supporting member should naturally be provided with a through-hole communicating with said small hole 12.
The number, shape and position of he concavity, air-release opening or small hole and sintered metal. friction material of the composite frictidn element of this invention are not restricted to those shown in the drawings, but may be optionally selected as required.
WHAT WE CLAIM IS:-
1. A composite friction clzr-'ent com- prising a supporting mcmbcr, a layer of organic friction material on on-c face of the supporting member, sail organic fnc- tion m terial being a bonded mass consisting of an inorganic mineral fiber, friction modifier and an organic resin binder, said layer having one or more recesses in that face thereof remote from the supporting member, and a sintered metal friction material inserted into said one or more recesses, which extend only partially through the thickness of the organic friction material layer so that the metal friction material is isolated from the supporting member.
2. The composite friction element according to claim which further comprises a small hole extending from the bottom of the or each recess to that side of the layer of organic friction material which lies adjacent the supporting member.
3. The composite friction element according to claim 1 or claim 2, when used as a brake lining of a vehicle.
4. The composite friction element according to claim 1 or claim 2, when used as a clutch facing of a vehicle.
5. The composite friction element according to any of claims 1 to 4 which further comprises a hole through which a fastening member is inserted ;to fasten the organic friction layer to the supporting member.
6. The composite friction element according to any of claims 1 to 5, wherein the recess or recesses are peripherally closed, so that the metal friction material is surrounded by the organic friction material.
7. The composite friction element according to any of claims 1 to 5, wherein the recess or recesses are open ended, so that the metal friction material extends to the edges of the layer of organic friction material.
8. The composite friction element according to claim 7, wherein the width of the or each recess becomes narrower toward the open ends thereof.
9. A composite friction element, substantially as hereinbefore described with reference to Figs. 1 and 2 or Figs. 3 and 4 or
Figs. 5 and 6 or Figs. 7 and 8 or Figs. 9 and 10 or Fig. 11 or Fig. 12 of the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (9)
1. A composite friction clzr-'ent com- prising a supporting mcmbcr, a layer of organic friction material on on-c face of the supporting member, sail organic fnc- tion måterial being a bonded mass consisting of an inorganic mineral fiber, friction modifier and an organic resin binder, said layer having one or more recesses in that face thereof remote from the supporting member, and a sintered metal friction material inserted into said one or more recesses, which extend only partially through the thickness of the organic friction material layer so that the metal friction material is isolated from the supporting member.
2. The composite friction element according to claim which further comprises a small hole extending from the bottom of the or each recess to that side of the layer of organic friction material which lies adjacent the supporting member.
3. The composite friction element according to claim 1 or claim 2, when used as a brake lining of a vehicle.
4. The composite friction element according to claim 1 or claim 2, when used as a clutch facing of a vehicle.
5. The composite friction element according to any of claims 1 to 4 which further comprises a hole through which a fastening member is inserted ;to fasten the organic friction layer to the supporting member.
6. The composite friction element according to any of claims 1 to 5, wherein the recess or recesses are peripherally closed, so that the metal friction material is surrounded by the organic friction material.
7. The composite friction element according to any of claims 1 to 5, wherein the recess or recesses are open ended, so that the metal friction material extends to the edges of the layer of organic friction material.
8. The composite friction element according to claim 7, wherein the width of the or each recess becomes narrower toward the open ends thereof.
9. A composite friction element, substantially as hereinbefore described with reference to Figs. 1 and 2 or Figs. 3 and 4 or
Figs. 5 and 6 or Figs. 7 and 8 or Figs. 9 and 10 or Fig. 11 or Fig. 12 of the accompanying drawings.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP8795676A JPS5314261A (en) | 1976-07-23 | 1976-07-23 | Friction material for automobiles |
| JP8938077U JPS5416957U (en) | 1977-07-06 | 1977-07-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1560042A true GB1560042A (en) | 1980-01-30 |
Family
ID=26429178
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB3046077A Expired GB1560042A (en) | 1976-07-23 | 1977-07-20 | Composite friction elements |
Country Status (2)
| Country | Link |
|---|---|
| DE (1) | DE2733244C2 (en) |
| GB (1) | GB1560042A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2125122A (en) * | 1982-07-27 | 1984-02-29 | Fibrax Ltd | A brake pad for use in a disc brake |
| GB2287451A (en) * | 1994-03-16 | 1995-09-20 | Hitachi Ltd | Emergency stop apparatus for elevator |
| US5979615A (en) * | 1997-11-06 | 1999-11-09 | Otis Elevator Company | Carbon--carbon composite elevator safety brakes |
| US6371261B1 (en) | 1997-11-06 | 2002-04-16 | Otis Elevator Company | Molybdenum alloy elevator safety brakes |
Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4202432A (en) * | 1977-12-12 | 1980-05-13 | Komori Seisakusho Co., Ltd. | Clutch disk for use in automobile |
| DE2902781A1 (en) * | 1979-01-25 | 1980-08-07 | Stoeber Geb | Friction ring for steplessly adjustable gearbox - has soft support material embedded into ring of hard wear-resistant material of tapered section |
| JPS586013U (en) * | 1981-07-07 | 1983-01-14 | 株式会社大金製作所 | clutch disc |
| DE4119515C1 (en) * | 1991-06-13 | 1992-12-10 | Textar Gmbh, 5090 Leverkusen, De | |
| DE19920079B4 (en) * | 1999-05-03 | 2004-06-24 | Dr.Ing.H.C. F. Porsche Ag | disc brake |
| DE10055796A1 (en) * | 2000-11-10 | 2002-05-29 | Continental Teves Ag & Co Ohg | Brake lining for friction brake has friction lining with support and friction surface, and spring element |
| DE102016120729B4 (en) | 2016-10-31 | 2021-03-04 | Saf-Holland Gmbh | Brake pad |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR518930A (en) * | 1913-09-29 | 1921-06-02 | Ferodo Ltd | Method and apparatus for attaching brake linings to shoes or other friction parts |
| GB789987A (en) * | 1954-01-12 | 1958-01-29 | Raybestos Co | Improvements in or relating to friction elements |
| FR1259664A (en) * | 1960-05-31 | 1961-04-28 | Morgan Crucible Co | friction element for brakes, clutches and the like |
| GB1083344A (en) * | 1965-03-05 | 1967-09-13 | Brake Linings Ltd | Improvements relating to friction materials |
| DE1985805U (en) * | 1967-01-21 | 1968-05-22 | Jurid Werke Gmbh | FRICTION LINING FOR BRAKES AND CLUTCHES. |
| DE1600168B1 (en) * | 1967-01-28 | 1970-10-15 | Teves Gmbh Alfred | Friction lining |
-
1977
- 1977-07-20 GB GB3046077A patent/GB1560042A/en not_active Expired
- 1977-07-22 DE DE19772733244 patent/DE2733244C2/en not_active Expired
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2125122A (en) * | 1982-07-27 | 1984-02-29 | Fibrax Ltd | A brake pad for use in a disc brake |
| GB2287451A (en) * | 1994-03-16 | 1995-09-20 | Hitachi Ltd | Emergency stop apparatus for elevator |
| GB2287451B (en) * | 1994-03-16 | 1998-03-04 | Hitachi Ltd | Emergency stop apparatus for elevator |
| US5979615A (en) * | 1997-11-06 | 1999-11-09 | Otis Elevator Company | Carbon--carbon composite elevator safety brakes |
| US6371261B1 (en) | 1997-11-06 | 2002-04-16 | Otis Elevator Company | Molybdenum alloy elevator safety brakes |
Also Published As
| Publication number | Publication date |
|---|---|
| DE2733244A1 (en) | 1978-02-09 |
| DE2733244C2 (en) | 1982-09-02 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed | ||
| PCNP | Patent ceased through non-payment of renewal fee |