AN AUTOMATICALLY REGULATED LEASH FOR DOMESTIC ANIMALS

Abstract

The invention relates to extensible leashes for domestic animals comprising a means for blocking extension of a cord (6) and allows the cord (6) to be extended up to a given maximum length in a regulated fashion. The automatically regulated leash for domestic animals that consists of a rind-shaped hollow body (12, 2) with a handle, wherein a winding roll with a cord (6) is mounted, the free end of the cord (6) is outwardly withdrawn through an opening in the body (12, 2), a stop (8) mechanism for the cord (6) that is regulated by a button (7) located on the body (12, 2). According to the invention, length of the cord (6) is from 2.5 to 3.5 meters. The cord (6) is configured to be wound on the roll that is mounted on guides in the body (12, 2) and comprises, on an inner cylindrical surface, teeth that are internally engaged with a toothed drum (4) mounted on the shaft fixedly attached in a cavity of the handle that is made as an elongated protrusion that has an elliptical shape in cross-section and made integrally with the body (12, 2). Inside the toothed drum (4) there is mounted a spiral band spring (5) that is made of a high-carbon alloyed steel having a Mn content of not more than 1.2%, which has a free end that is fixed on the shaft, and another one that is fixed on a lateral inner wall of the drum (4) having an operational stroke range along the diameter of from 4 to 15 mm. Width of the band spring (5) is within 12±5 mm, length in a deployed state is 2500±800 mm, thickness is 0.1±0.03 mm. Therewith, the diameter of the toothed drum (4) is 0.25-0.40 of the diameter of the toothed surface of the winding roll. The cord (6) is a band that has light-reflecting elements. The body (12, 2) and the internal components of the structure are made of ABS-plastic. The body (12, 2) portion that is provided with the opening for withdrawal of the free end of the cord (6) is displaced relative to the central axis thereof, while the center of gravity is located closer to the handle. The hollow ring-shaped body (12, 2) is made from two symmetrical half pieces. The band spring (5) has a high fatigue strength limit.

Claims

1. An automatically regulated leash for domestic animals that comprises: a ring-shaped hollow body with a handle, wherein a winding roll with a cord is mounted; a free end of the cord that is outwardly withdrawn through an opening in the body; a stop mechanism for the cord that is regulated by a button located on the body; characterized in that the cord has a length of from 2.5 to 3.5 meters, it is configured to be wound on the roll that is mounted on guides in the body, and it comprises, on an inner cylindrical surface, teeth that are internally engaged with a toothed drum mounted on a shaft fixedly attached in a cavity of the handle that is made as an elongated protrusion that has an elliptical shape in cross-section and is made integrally with the body, wherein inside the toothed drum there is mounted a spiral band spring that is made of a high-carbon alloyed steel having a Mn content of not more than 1.2%, which has a free end that is fixed on the shaft and another end that is fixed on a lateral inner wall of the drum, and having an operational stroke range along the diameter of from 4 to 15 mm, a width of the band spring is within 12±5 mm, a length of the band spring in a deployed state is 2500±800 mm, thickness is 0.1±0.03 mm, and wherein the diameter of the toothed drum is 0.25-0.40 of the diameter of the toothed surface of the winding roll.

2. The automatically regulated leash for domestic animals according to claim 1, characterized in that the cord is a band that has light-reflecting elements.

3. The automatically regulated leash for domestic animals according to claim 1, characterized in that the body and the inner components are made of ABS-plastic.

4. The automatically regulated leash for domestic animals according to claim 1, characterized in that the body portion that is provided with the opening for withdrawal of the free end of the cord is displaced relative to a central axis thereof, while a center of gravity is located closer to the handle.

5. The automatically regulated leash for domestic animals according to claim 1, characterized in that the hollow ring-shaped body is made from two symmetrical half pieces.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The invention disclosed herein will be more clearly understood from the following exemplary embodiment and the corresponding accompanying drawings in which:

[0013] FIG. 1—a general view of the automatically regulated leash for domestic animals:

[0014] a—side view, b—a profile view.

[0015] FIG. 2—the toothed drum with the spiral band spring.

[0016] Figure drawings that illustrate the invention claimed as well as particular embodiments are merely exemplary in nature and are in no way intended to limit the claims appended hereto but to explain the essence of the invention.

DETAILED DESCRIPTION OF THE INVENTION (INFORMATION CONFIRMING THE POSSIBILITY OF EMBODIMENT)

[0017] The automatically regulated leash for domestic animals has a ring-shaped hollow body that consists of two half pieces 1, 2, a toothed roll 3 located on guides of the bodies 1, 2 and a toothed drum 4. Inside the toothed drum 4 there is located a spiral band spring 5, one free end thereof is fixed on a shaft of the body 2, and another one is fixed on a lateral inner wall of the drum 4. A cord 6 having a length of from 2.5 to 3.5 meters is wound on the toothed roll 3. Also, the leash has a button 7 and stop 8 to stop the toothed roll 3.

[0018] The automatically regulated leash for domestic animals operates as follows.

[0019] In the process of usage of the leash, the spring 5 that is located inside the body of the toothed drum 4 is exposed to alternating loads caused by its extension and contraction. Long-term continuous operation is enabled by a high elastic modulus of the band steel (E≤2.15.Math.10.sup.5 MPa), from which it is made. Due to the tensile force of the spring, the toothed drum 4 that engages the toothed roll 3 with the cord 6 wound thereon transmits the torque to the toothed roll 3, thus, the leash cord 6 extends. When the spring 5 is compressed, the leash cord is unwound. Regulation of the leash cord 6 length and its fixation are performed by a button 7 located on the body 1, 2. Change in the cord 6 length is provided by pressing and holding the button 7 in a given position. Also, the structure of the leash implies a fixed position of the button 7 that does not require permanent pressing and holding the button 7.