diff --git a/lerobot/common/constants.py b/lerobot/common/constants.py
index bd22201b..9e83bf33 100644
--- a/lerobot/common/constants.py
+++ b/lerobot/common/constants.py
@@ -4,8 +4,8 @@ from pathlib import Path
 
 from huggingface_hub.constants import HF_HOME
 
-OBS_ENV = "observation.environment_state"
-OBS_ROBOT = "observation.state"
+OBS_ENV_STATE = "observation.environment_state"
+OBS_STATE = "observation.state"
 OBS_IMAGE = "observation.image"
 OBS_IMAGES = "observation.images"
 ACTION = "action"
diff --git a/lerobot/common/robots/koch/configuration_koch.py b/lerobot/common/robots/koch/configuration_koch.py
index 1db724c5..d6ec3da5 100644
--- a/lerobot/common/robots/koch/configuration_koch.py
+++ b/lerobot/common/robots/koch/configuration_koch.py
@@ -16,10 +16,6 @@ class KochRobotConfig(RobotConfig):
     # the number of motors in your follower arms.
     max_relative_target: int | None = None
 
-    # Sets the leader arm in torque mode with the gripper motor set to this angle. This makes it possible
-    # to squeeze the gripper and have it spring back to an open position on its own.
-    gripper_open_degree: float = 35.156
-
     mock: bool = False
 
     # motors
diff --git a/lerobot/common/robots/koch/robot_koch.py b/lerobot/common/robots/koch/robot_koch.py
index f206b0bf..469953c2 100644
--- a/lerobot/common/robots/koch/robot_koch.py
+++ b/lerobot/common/robots/koch/robot_koch.py
@@ -21,6 +21,7 @@ import time
 import numpy as np
 
 from lerobot.common.cameras.utils import make_cameras_from_configs
+from lerobot.common.constants import OBS_IMAGES, OBS_STATE
 from lerobot.common.errors import DeviceAlreadyConnectedError, DeviceNotConnectedError
 from lerobot.common.motors.dynamixel import (
     DynamixelMotorsBus,
@@ -118,8 +119,8 @@ class KochRobot(Robot):
         self.arm.read("Present_Position")
 
         # Connect the cameras
-        for name in self.cameras:
-            self.cameras[name].connect()
+        for cam in self.cameras.values():
+            cam.connect()
 
         self.is_connected = True
 
@@ -156,13 +157,13 @@ class KochRobot(Robot):
 
         # Read arm position
         before_read_t = time.perf_counter()
-        obs_dict["observation.state"] = self.arm.read("Present_Position")
+        obs_dict[OBS_STATE] = self.arm.read("Present_Position")
         self.logs["read_pos_dt_s"] = time.perf_counter() - before_read_t
 
         # Capture images from cameras
         for cam_key, cam in self.cameras.items():
             before_camread_t = time.perf_counter()
-            obs_dict[f"observation.images.{cam_key}"] = cam.async_read()
+            obs_dict[f"{OBS_IMAGES}.{cam_key}"] = cam.async_read()
             self.logs[f"read_camera_{cam_key}_dt_s"] = cam.logs["delta_timestamp_s"]
             self.logs[f"async_read_camera_{cam_key}_dt_s"] = time.perf_counter() - before_camread_t