WO2009051520A2 - Cam with separated peripheral surfaces - Google Patents

Cam with separated peripheral surfaces Download PDF

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Publication number
WO2009051520A2
WO2009051520A2 PCT/RU2008/000588 RU2008000588W WO2009051520A2 WO 2009051520 A2 WO2009051520 A2 WO 2009051520A2 RU 2008000588 W RU2008000588 W RU 2008000588W WO 2009051520 A2 WO2009051520 A2 WO 2009051520A2
Authority
WO
WIPO (PCT)
Prior art keywords
cam
string
cable
peripheral surfaces
strings
Prior art date
Application number
PCT/RU2008/000588
Other languages
French (fr)
Other versions
WO2009051520A3 (en
Inventor
Sergey Olegovich Popov
Pavel Vitalievich Ivanov
Sergey Anatolievich Golovatyy
Stanislav Svyatoslavovich Sagakov
Original Assignee
Sergey Olegovich Popov
Pavel Vitalievich Ivanov
Sergey Anatolievich Golovatyy
Sagakov Stanislav Svyatoslavov
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Sergey Olegovich Popov, Pavel Vitalievich Ivanov, Sergey Anatolievich Golovatyy, Sagakov Stanislav Svyatoslavov filed Critical Sergey Olegovich Popov
Priority to US12/679,524 priority Critical patent/US20100206284A1/en
Publication of WO2009051520A2 publication Critical patent/WO2009051520A2/en
Publication of WO2009051520A3 publication Critical patent/WO2009051520A3/en

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/14—Details of bows; Accessories for arc shooting
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/10—Compound bows
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F41—WEAPONS
    • F41B—WEAPONS FOR PROJECTING MISSILES WITHOUT USE OF EXPLOSIVE OR COMBUSTIBLE PROPELLANT CHARGE; WEAPONS NOT OTHERWISE PROVIDED FOR
    • F41B5/00—Bows; Crossbows
    • F41B5/10—Compound bows
    • F41B5/105—Cams or pulleys for compound bows

Definitions

  • This invention belongs to projectile throwing instruments that use the energy of the strained hard body and can be used for the design and construction of a missile throwing weapon - namely for a bow and crossbow.
  • cams Since the middle of the 20 th century, these cams have been widely used for the designing of bows and crossbows. According to the common technique, the cams have at least two peripheral surfaces on which a working bowstring and cable strings are placed. The cams are mainly placed on the free ends of the limbs.
  • the main characteristic feature and advantage of cam usage in the projectile throwing instrument design is the release of the pulling force in the tension endpoint and the increase of the thrown projectile's speed at the moment of its shooting.
  • cam throwing devices are the fastest and are rather compact. All of the technical solutions that aimed to perfect the design of the projectile throwing instrument according to the previous technical level are mainly directed towards changing the geometrical shape of the cam.
  • cam peripheral surfaces location in the middle part of the holding axle by means of which the cam is fixed onto a limb.
  • peripheral surfaces are situated at a short distance from each other.
  • the cable strings are located near the working bowstring and hinder the path of the thrown missile. That is why during the design of projectile throwing instruments there appears the necessity to forcedly turn the cable strings away from the working string.
  • various constructions of cable string retractor assemblies are used. The main drawback in the well-known cam constructions is that they cause additional friction on the joints and spiral torsional strains that are passed by the cable strings to the limbs.
  • the technical problem which is to be solved by means of the given invention implies the creation of an improved cam design that will allow for the manufacturing of cam throwers without turning away the joints of the cable strings, which in its turn will increase the efficiency of the work of the limbs.
  • the technical result provided by the usage of the present invention consists in the increase of the maximum starting speed of the thrown missile, improved shooting accuracy and density, as well as the decrease of its noise and vibration.
  • the cam represents the spinning part of a wheel shape or of a complex non-round shape including the shifted spinning axis.
  • the system consisting of at least one designed cam and containing limbs with free ends is to be placed on the projectile throwing instrument.
  • the cams On the free ends the cams able to spin, and they have peripheral surfaces that give way to the string and cable strings.
  • the string's peripheral surface stands from the cable strings' peripheral surfaces at a distance that is enough to expel the joint of the cable strings' peripheral surfaces and turn-away out of the projectile throwing instrument's design.
  • the divided cam represents the spinning part of the round, elliptic, or any other shape known in the given branch of engineering.
  • the peripheral surface which is shaped like a string channel, is situated in the upper part of the cam.
  • the middle part of the divided cam serves to separate the string's peripheral surface and cable strings' peripheral surfaces within a distance at which the cable strings do not prevent shooting.
  • the upper and lower parts of the divided cam are firmly interconnected and turn around the spinning axis synchronously.
  • the constructive use of the divided cam and used materials can be various and can be used in the given branch of engineering.
  • the limbs can be placed in the middle part of the divided cam between the string's peripheral surface and the cable strings' peripheral surface.
  • the divided cam's spinning axis can go through the cam's center or be shifted relative to the cam's center.
  • Cable strings can be placed on the peripheral surfaces in the cam's lower part in parallel or intercross.
  • the divided cams can be placed on the crossbow, on the bow, or on any other suitable projectile throwing instrument.
  • Fig. 1 shows the system of cams with the joint of cable strings' turn-away according to the known engineering level.
  • Fig. 2 shows the system of divided cams with crossed cable strings according to the present invention.
  • Fig. 3 shows the system of divided cams with parallel cable strings according to the present invention.
  • limbs I 5 cam's holding axis 2 cam accordingly to the known engineering level 3
  • string's peripheral surface 4 peripheral surface for one cable string 5
  • peripheral surface for another cable string 6 thrown missile 7, joint of cable strings' turn-away 8
  • the string's path of motion 9 motion path of one cable string 10
  • motion path of another cable string 11 middle part of divided cam 12, upper part of divided cam 13, and the lower part of divided cam 14.
  • Preparation and shooting of the bow or crossbow using the designed cam construction does not differ from the preparation and shooting of a bow or crossbow using the cam-prototype.
  • the use of the mentioned technical solution allows for an increase of the maximum starting speed of the thrown projectile by approximately 15%, accuracy and the density of shooting by approximately 10%, and at the same time a decrease in the noise and vibration of the shooting.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Aiming, Guidance, Guns With A Light Source, Armor, Camouflage, And Targets (AREA)
  • Electrophonic Musical Instruments (AREA)

Abstract

This invention belongs to projectile throwing instruments that use the energy of the strained hard body and can be used for the design and construction of a missile throwing weapon - namely for a bow and crossbow.

Description

Cam with separated peripheral surfaces
This invention belongs to projectile throwing instruments that use the energy of the strained hard body and can be used for the design and construction of a missile throwing weapon - namely for a bow and crossbow.
Since the middle of the 20th century, these cams have been widely used for the designing of bows and crossbows. According to the common technique, the cams have at least two peripheral surfaces on which a working bowstring and cable strings are placed. The cams are mainly placed on the free ends of the limbs. The main characteristic feature and advantage of cam usage in the projectile throwing instrument design is the release of the pulling force in the tension endpoint and the increase of the thrown projectile's speed at the moment of its shooting. In addition, cam throwing devices are the fastest and are rather compact. All of the technical solutions that aimed to perfect the design of the projectile throwing instrument according to the previous technical level are mainly directed towards changing the geometrical shape of the cam. However, with all the diversity of cam shapes and designs, all of them have two common characteristic features. The first one is the cam peripheral surfaces' location in the middle part of the holding axle by means of which the cam is fixed onto a limb. Secondly, the peripheral surfaces are situated at a short distance from each other. In such a location of the peripheral surfaces, the cable strings are located near the working bowstring and hinder the path of the thrown missile. That is why during the design of projectile throwing instruments there appears the necessity to forcedly turn the cable strings away from the working string. For this, various constructions of cable string retractor assemblies are used. The main drawback in the well-known cam constructions is that they cause additional friction on the joints and spiral torsional strains that are passed by the cable strings to the limbs.
There is a well-known design (US patent 6,659,096Bl), which contains a cam fixed onto the flexible element's free end, which is able to spin and has peripheral surfaces that give way to the working string and cable strings. These surfaces are situated in the middle part of the cam's axle that is fixed to the limb at a short distance from one another.
The main drawback of the bow mentioned above is the necessity to turn the cable strings away from the working string.
There is a crossbow design (US patent 6,460,528 Bl) that contains the cam fixed on the flexible element's free end, which is able to spin and has peripheral surfaces that give way to the working string and cable strings. These surfaces are situated in the middle part of the cam's axle that is fixed to the limb at a short distance from one another.
The main drawback of the crossbow mentioned above is the necessity to turn the cable strings away from the working string.
The technical problem, which is to be solved by means of the given invention implies the creation of an improved cam design that will allow for the manufacturing of cam throwers without turning away the joints of the cable strings, which in its turn will increase the efficiency of the work of the limbs.
The technical result provided by the usage of the present invention consists in the increase of the maximum starting speed of the thrown missile, improved shooting accuracy and density, as well as the decrease of its noise and vibration.
To achieve the mentioned technical result it is recommended to use the divided cam of the bow or crossbow's string tension that are placed on the flexible element's free end, which is able to spin and has peripheral surfaces that give way to the working string and at least one cable string, in which this string's peripheral surface is located at the nearest peripheral surface of the cable string at a distance at which the cable string does not in any way obstruct the path of the thrown missile.
The cam represents the spinning part of a wheel shape or of a complex non-round shape including the shifted spinning axis.
The system consisting of at least one designed cam and containing limbs with free ends is to be placed on the projectile throwing instrument. On the free ends the cams able to spin, and they have peripheral surfaces that give way to the string and cable strings. With this, the string's peripheral surface stands from the cable strings' peripheral surfaces at a distance that is enough to expel the joint of the cable strings' peripheral surfaces and turn-away out of the projectile throwing instrument's design.
In most cases, the divided cam represents the spinning part of the round, elliptic, or any other shape known in the given branch of engineering. The peripheral surface, which is shaped like a string channel, is situated in the upper part of the cam. In the lower part of the cam, at least one peripheral surface for cable strings is located. The middle part of the divided cam serves to separate the string's peripheral surface and cable strings' peripheral surfaces within a distance at which the cable strings do not prevent shooting. The upper and lower parts of the divided cam are firmly interconnected and turn around the spinning axis synchronously. The constructive use of the divided cam and used materials can be various and can be used in the given branch of engineering. To decrease the size, the limbs can be placed in the middle part of the divided cam between the string's peripheral surface and the cable strings' peripheral surface. The divided cam's spinning axis can go through the cam's center or be shifted relative to the cam's center. Cable strings can be placed on the peripheral surfaces in the cam's lower part in parallel or intercross.
The divided cams can be placed on the crossbow, on the bow, or on any other suitable projectile throwing instrument.
Furthermore, the present invention will be described in detail using diagrams. Fig. 1 shows the system of cams with the joint of cable strings' turn-away according to the known engineering level. Fig. 2 shows the system of divided cams with crossed cable strings according to the present invention. Fig. 3 shows the system of divided cams with parallel cable strings according to the present invention.
The following legend is used in the diagrams: limbs I5 cam's holding axis 2, cam accordingly to the known engineering level 3, string's peripheral surface 4, peripheral surface for one cable string 5, peripheral surface for another cable string 6, thrown missile 7, joint of cable strings' turn-away 8, the string's path of motion 9, motion path of one cable string 10, motion path of another cable string 11, middle part of divided cam 12, upper part of divided cam 13, and the lower part of divided cam 14.
Preparation and shooting of the bow or crossbow using the designed cam construction does not differ from the preparation and shooting of a bow or crossbow using the cam-prototype.
The use of the mentioned technical solution allows for an increase of the maximum starting speed of the thrown projectile by approximately 15%, accuracy and the density of shooting by approximately 10%, and at the same time a decrease in the noise and vibration of the shooting.

Claims

Claims
1. A cam with separated peripheral surfaces for the projectile throwing instrument is installed on the free end of the thrower's limb, which is able to spin and has peripheral surfaces that give way to the string and cable strings. With this, the string's peripheral surface stands from the cable strings' peripheral surfaces at a distance far enough to allow for the string and at least one cable string, in which the distance between the string's peripheral surface and the nearest peripheral surface is enough for the cable string not to hinder the path of the thrown projectile. Moreover, the cable strings are completely intercrossed.
2. The cam of claim 1 wherein the cable strings are not intercrossed.
3. The cam of claim 1 wherein the symmetry axis coincides with the spinning axis.
4. The cam of claim 1 wherein the symmetry axis stands off from the spinning axis.
5. The cam of claim 1 wherein the cam is of a round shape.
6. The cam of claim 1 wherein the cam is of a non-round shape.
PCT/RU2008/000588 2007-10-16 2008-09-09 Cam with separated peripheral surfaces WO2009051520A2 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US12/679,524 US20100206284A1 (en) 2007-10-16 2008-09-09 Cam with separated peripheral surfaces

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
RU2007138057 2007-10-16
RU2007138057/02A RU2357175C1 (en) 2007-10-16 2007-10-16 Assembly with divided peripheral surfaces

Publications (2)

Publication Number Publication Date
WO2009051520A2 true WO2009051520A2 (en) 2009-04-23
WO2009051520A3 WO2009051520A3 (en) 2009-06-04

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/RU2008/000588 WO2009051520A2 (en) 2007-10-16 2008-09-09 Cam with separated peripheral surfaces

Country Status (3)

Country Link
US (1) US20100206284A1 (en)
RU (1) RU2357175C1 (en)
WO (1) WO2009051520A2 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010124368A1 (en) 2009-04-28 2010-11-04 Evans John D Compound bows with modified cams
TWI691697B (en) * 2019-03-05 2020-04-21 經緯度企業有限公司 Crossbow that reduces the size of the crossbow
US11609061B2 (en) 2018-07-03 2023-03-21 Crosman Corporation Crossbow

Families Citing this family (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US8991375B2 (en) 2013-03-15 2015-03-31 Mcp Ip, Llc Crossbow cabling arrangement
US10254075B2 (en) * 2013-12-16 2019-04-09 Ravin Crossbows, Llc Reduced length crossbow
US10712118B2 (en) * 2013-12-16 2020-07-14 Ravin Crossbows, Llc Crossbow
US10209026B2 (en) 2013-12-16 2019-02-19 Ravin Crossbows, Llc Crossbow with pulleys that rotate around stationary axes
US10962322B2 (en) * 2013-12-16 2021-03-30 Ravin Crossbows, Llc Bow string cam arrangement for a compound bow
US10254073B2 (en) 2013-12-16 2019-04-09 Ravin Crossbows, Llc Crossbow
US20230168062A1 (en) * 2013-12-16 2023-06-01 Ravin Crossbows, Llc Crossbow
US9746275B1 (en) 2017-01-19 2017-08-29 Sergey Popov Split cams for a compound archery bow
US10077963B1 (en) 2017-05-18 2018-09-18 Sergey Popov Double limb for arrow throwing device and arrow throwing device using the same
US10267590B1 (en) * 2018-06-28 2019-04-23 BowTech, Inc. Spiral-wound split-buss let-out mechanism for a compound archery bow

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2026528C1 (en) * 1991-10-24 1995-01-09 Евгений Парфирьевич Казанцев Arbalest
RU2093771C1 (en) * 1995-10-04 1997-10-20 Сергей Николаевич Низов Arbalest
US6460528B1 (en) * 2000-01-24 2002-10-08 Bear Archery, L.L.C. Crossbow having a no let-off cam
US6688295B1 (en) * 2003-01-10 2004-02-10 Larry Miller Pulley assembly for compound archery bows, and bows incorporating said assembly

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US6874491B2 (en) * 2003-01-15 2005-04-05 William Bednar Crossbow rope cocking device
US7363921B2 (en) * 2005-01-05 2008-04-29 J & S R.D.T. Archery Crossbow
US7178514B2 (en) * 2005-01-28 2007-02-20 Poe Lang Enterprise Co., Ltd. Crossbow with a vibration-damping device
US7441555B1 (en) * 2005-09-30 2008-10-28 Larson Archery Company Synchronized compound archery bow
KR100664420B1 (en) * 2006-02-21 2007-01-04 이슬기 Compound bow

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2026528C1 (en) * 1991-10-24 1995-01-09 Евгений Парфирьевич Казанцев Arbalest
RU2093771C1 (en) * 1995-10-04 1997-10-20 Сергей Николаевич Низов Arbalest
US6460528B1 (en) * 2000-01-24 2002-10-08 Bear Archery, L.L.C. Crossbow having a no let-off cam
US6688295B1 (en) * 2003-01-10 2004-02-10 Larry Miller Pulley assembly for compound archery bows, and bows incorporating said assembly

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2010124368A1 (en) 2009-04-28 2010-11-04 Evans John D Compound bows with modified cams
EP2425198A1 (en) * 2009-04-28 2012-03-07 John D. Evans Compound bows with modified cams
CN102460059A (en) * 2009-04-28 2012-05-16 约翰.D.埃文斯 Compound bows with modified cams
EP2425198A4 (en) * 2009-04-28 2014-01-22 John D Evans Compound bows with modified cams
US9459066B2 (en) 2009-04-28 2016-10-04 John D. Evans Compound bows with modified cams
US9885535B2 (en) 2009-04-28 2018-02-06 John D. Evans Compound bows with modified cams
US11609061B2 (en) 2018-07-03 2023-03-21 Crosman Corporation Crossbow
TWI691697B (en) * 2019-03-05 2020-04-21 經緯度企業有限公司 Crossbow that reduces the size of the crossbow

Also Published As

Publication number Publication date
WO2009051520A3 (en) 2009-06-04
US20100206284A1 (en) 2010-08-19
RU2357175C1 (en) 2009-05-27

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